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Frede Blaabjerg
Energy Technology, Aalborg University, Aalborg, Denmark, DK-9220

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Short Biography

Frede Blaabjerg's research interests include power electronics and its applications such as in wind turbines, PV systems, reliability, harmonics and adjustable speed drives. He has published more than 300 journal papers in the fields of power electronics and its applications. He has received 17 IEEE Prize Paper Awards, the IEEE PELS Distinguished Service Award in 2009, the EPE-PEMC Council Award in 2010, the IEEE William E. Newell Power Electronics Award 2014 and the Villum Kann Rasmussen Research Award 2014. He was the Editor-in-Chief of the IEEE TRANSACTIONS ON POWER ELECTRONICS from 2006 to 2012. He has been Distinguished Lecturer for the IEEE Power Electronics Society from 2005 to 2007 and for the IEEE Industry Applications Society from 2010 to 2011.

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Journal article
Published: 13 August 2021 in IEEE Transactions on Power Electronics
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Due to the importance of reliability and security in DC microgrids, it is essential to provide maximum resilience against cyber-attacks. However, insufficient global information in the microgrid makes it difficult to accurately identify the location of these attacks. To address these issues, this paper develops a novel resilient distributed control mechanism, which ensures average voltage regulation and proportional load sharing in DC microgrids under unknown cyber-attacks. The proposed resilient control design does not require any information regarding the nature or location of the attacks. By virtue of a graph theoretical approach and a Lyapunov-based framework, the proposed resilient distributed control strategy is designed in a way such that the system stability is always guaranteed following a comprehensive design mechanism. Finally, the robustness of the proposed resilient distributed control approach is demonstrated via simulations and validated by experimental results.

ACS Style

Mahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. Stability Oriented Design of Cyber Attack Resilient Controllers for Cooperative DC Microgrids. IEEE Transactions on Power Electronics 2021, PP, 1 -1.

AMA Style

Mahdieh S. Sadabadi, Subham Sahoo, Frede Blaabjerg. Stability Oriented Design of Cyber Attack Resilient Controllers for Cooperative DC Microgrids. IEEE Transactions on Power Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Mahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. 2021. "Stability Oriented Design of Cyber Attack Resilient Controllers for Cooperative DC Microgrids." IEEE Transactions on Power Electronics PP, no. 99: 1-1.

Journal article
Published: 12 August 2021 in Energies
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The integration of variable distributed generations (DGs) and loads in microgrids (MGs) has made the reliance on communication systems inevitable for information exchange in both control and protection architectures to enhance the overall system reliability, resiliency and sustainability. This communication backbone in turn also exposes MGs to potential malicious cyber attacks. To study these vulnerabilities and impacts of various cyber attacks, testbeds play a crucial role in managing their complexity. This research work presents a detailed study of the development of a real-time co-simulation testbed for inverter-based MGs. It consists of a OP5700 real-time simulator, which is used to emulate both the physical and cyber layer of an AC MG in real time through HYPERSIM software; and SEL-3530 Real-Time Automation Controller (RTAC) hardware configured with ACSELERATOR RTAC SEL-5033 software. A human–machine interface (HMI) is used for local/remote monitoring and control. The creation and management of HMI is carried out in ACSELERATOR Diagram Builder SEL-5035 software. Furthermore, communication protocols such as Modbus, sampled measured values (SMVs), generic object-oriented substation event (GOOSE) and distributed network protocol 3 (DNP3) on an Ethernet-based interface were established, which map the interaction among the corresponding nodes of cyber-physical layers and also synchronizes data transmission between the systems. The testbed not only provides a real-time co-simulation environment for the validation of the control and protection algorithms but also extends to the verification of various detection and mitigation algorithms. Moreover, an attack scenario is also presented to demonstrate the ability of the testbed. Finally, challenges and future research directions are recognized and discussed.

ACS Style

Kirti Gupta; Subham Sahoo; Bijaya Ketan Panigrahi; Frede Blaabjerg; Petar Popovski. On the Assessment of Cyber Risks and Attack Surfaces in a Real-Time Co-Simulation Cybersecurity Testbed for Inverter-Based Microgrids. Energies 2021, 14, 4941 .

AMA Style

Kirti Gupta, Subham Sahoo, Bijaya Ketan Panigrahi, Frede Blaabjerg, Petar Popovski. On the Assessment of Cyber Risks and Attack Surfaces in a Real-Time Co-Simulation Cybersecurity Testbed for Inverter-Based Microgrids. Energies. 2021; 14 (16):4941.

Chicago/Turabian Style

Kirti Gupta; Subham Sahoo; Bijaya Ketan Panigrahi; Frede Blaabjerg; Petar Popovski. 2021. "On the Assessment of Cyber Risks and Attack Surfaces in a Real-Time Co-Simulation Cybersecurity Testbed for Inverter-Based Microgrids." Energies 14, no. 16: 4941.

Journal article
Published: 10 August 2021 in Energies
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The droop control scheme based on Q − ω and PV characteristics is conventionally employed to share the load power among sources in an islanded low-voltage microgrid with resistive line impedances. However, it suffers from poor active power sharing, and is vulnerable to sustained deviations in frequency and voltage. Therefore, accurate power sharing and maintaining the frequency and voltage in the desired ranges are challenging. This paper proposes a novel microgrid control strategy to address these issues. The proposed strategy consists of a virtual flux droop and a model predictive control, in which the virtual flux is the time integral of the voltage. Firstly, the novel virtual flux droop control is proposed to accurately control the power sharing among DGs. Then, the model predictive flux control is employed to generate the appropriate switching signals. The proposed strategy is simple without needing multiple feedback control loops. In addition, pulse width modulation is not required and tuning challenges for PI regulators are avoided. In order to evaluate the effectiveness of the proposed microgrid control strategy, simulation analysis is carried out in Matlab/Simulink software environment. The results show that accurate power sharing is achieved while a good dynamic response is provided. Furthermore, the voltage and frequency deviations are significantly improved.

ACS Style

Saheb Khanabdal; Mahdi Banejad; Frede Blaabjerg; Nasser Hosseinzadeh. A Novel Power Sharing Strategy Based on Virtual Flux Droop and Model Predictive Control for Islanded Low-Voltage AC Microgrids. Energies 2021, 14, 4893 .

AMA Style

Saheb Khanabdal, Mahdi Banejad, Frede Blaabjerg, Nasser Hosseinzadeh. A Novel Power Sharing Strategy Based on Virtual Flux Droop and Model Predictive Control for Islanded Low-Voltage AC Microgrids. Energies. 2021; 14 (16):4893.

Chicago/Turabian Style

Saheb Khanabdal; Mahdi Banejad; Frede Blaabjerg; Nasser Hosseinzadeh. 2021. "A Novel Power Sharing Strategy Based on Virtual Flux Droop and Model Predictive Control for Islanded Low-Voltage AC Microgrids." Energies 14, no. 16: 4893.

Review
Published: 02 August 2021 in Energies
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The use of artificial intelligence (AI) is increasing in various sectors of photovoltaic (PV) systems, due to the increasing computational power, tools and data generation. The currently employed methods for various functions of the solar PV industry related to design, forecasting, control, and maintenance have been found to deliver relatively inaccurate results. Further, the use of AI to perform these tasks achieved a higher degree of accuracy and precision and is now a highly interesting topic. In this context, this paper aims to investigate how AI techniques impact the PV value chain. The investigation consists of mapping the currently available AI technologies, identifying possible future uses of AI, and also quantifying their advantages and disadvantages in regard to the conventional mechanisms.

ACS Style

Varaha Kurukuru; Ahteshamul Haque; Mohammed Khan; Subham Sahoo; Azra Malik; Frede Blaabjerg. A Review on Artificial Intelligence Applications for Grid-Connected Solar Photovoltaic Systems. Energies 2021, 14, 4690 .

AMA Style

Varaha Kurukuru, Ahteshamul Haque, Mohammed Khan, Subham Sahoo, Azra Malik, Frede Blaabjerg. A Review on Artificial Intelligence Applications for Grid-Connected Solar Photovoltaic Systems. Energies. 2021; 14 (15):4690.

Chicago/Turabian Style

Varaha Kurukuru; Ahteshamul Haque; Mohammed Khan; Subham Sahoo; Azra Malik; Frede Blaabjerg. 2021. "A Review on Artificial Intelligence Applications for Grid-Connected Solar Photovoltaic Systems." Energies 14, no. 15: 4690.

Journal article
Published: 26 July 2021 in IEEE Transactions on Power Electronics
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DC-link dynamic is one of the most important issues for current source converters (CSC). In practice, the dc-link voltage suffers from the slow dynamic due to grid disturbances, which will affect the quality of output waveform and damage the converter. Many solutions have been presented to cope with it, but none of them achieve the zero dynamic dc-link voltage control. In order to fill the technical gap, a novel solution is proposed in this paper. Firstly, the impact of grid disturbances on the current source converter (CSC) is discussed with instantaneous power theory and small signal model analysis. Secondly, a new solution is presented to eliminate the adverse impacts of grid disturbances, so as to achieve the zero dynamic dc-link control concept. Meanwhile, the power quality of grid current is improved. Finally, the experiments for the proposed solution under grid disturbances are carried out with TMS320F28335 DSP + XC3400 FPGA digital control hardware platform. The experimental results verify the effectiveness of the proposed solution.

ACS Style

Yong Yang; Xiao-Qiang Guo; Hao Ding; Zhigang Lu; Changchun Hua; Mariusz Malinowski; Frede Blaabjerg. Zero Dynamic DC-link Voltage Control for Current Source Converter under Grid Disturbances. IEEE Transactions on Power Electronics 2021, PP, 1 -1.

AMA Style

Yong Yang, Xiao-Qiang Guo, Hao Ding, Zhigang Lu, Changchun Hua, Mariusz Malinowski, Frede Blaabjerg. Zero Dynamic DC-link Voltage Control for Current Source Converter under Grid Disturbances. IEEE Transactions on Power Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Yong Yang; Xiao-Qiang Guo; Hao Ding; Zhigang Lu; Changchun Hua; Mariusz Malinowski; Frede Blaabjerg. 2021. "Zero Dynamic DC-link Voltage Control for Current Source Converter under Grid Disturbances." IEEE Transactions on Power Electronics PP, no. 99: 1-1.

Journal article
Published: 21 July 2021 in IEEE Transactions on Industrial Electronics
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Nowadays, the dual closed-loop Proportional-Integral-Lead (PI-Lead) controller is widely used, especially for the servo systems where high performance is required for motion control, like lithography machines and vehicle-used Lidars. Considering complex industrial applications and working conditions, more comprehensive and systematic research about the structure and potential problem of the PI-Lead controller is necessary for enhancing its performance and robustness. In this paper, the failure mechanism of the classic Anti-Windup methods in the PI-Lead controller is analyzed. By adjusting the location of control blocks, a novel reversed-structure-based PI-Lead controller is proposed as a complement to the traditional anti-windup methods for effective operation, and to make the system stable under the severe impact disturbance. Then, a self-commissioning strategy is designed, based on a Fast Root Mean Square Error (FRMSE) index and without additional manual tuning factors. Compared with classic indicators, the proposed FRMSE index can achieve faster instability detection and accelerate the tuning process to protect the equipment.

ACS Style

Yangyang Chen; Ming Yang; KaiYuan Liu; Jiang Long; Dianguo Xu; Frede Blaabjerg. Reversed-Structure-Based PI-Lead Controller Anti-Windup Design and Self-Commissioning Strategy for Servo Drive Systems. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.

AMA Style

Yangyang Chen, Ming Yang, KaiYuan Liu, Jiang Long, Dianguo Xu, Frede Blaabjerg. Reversed-Structure-Based PI-Lead Controller Anti-Windup Design and Self-Commissioning Strategy for Servo Drive Systems. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Yangyang Chen; Ming Yang; KaiYuan Liu; Jiang Long; Dianguo Xu; Frede Blaabjerg. 2021. "Reversed-Structure-Based PI-Lead Controller Anti-Windup Design and Self-Commissioning Strategy for Servo Drive Systems." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.

Journal article
Published: 20 July 2021 in IEEE Access
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In this paper, a novel pulse tripling circuit (PTC) is suggested, to upgrade a polygon autotransformer 12-pulse rectifier (12-PR) to a 36-pulse rectifier (36-PR) with a low power rating. The kVA rating of the proposed PTC is lower compared to the conventional one (about 1.57% of load power). Simulation and experimental test results show that the total harmonic distortion (THD) of the input current of the suggested 36-PR is less than 3%, which meets the IEEE 519 requirements. Also, it is shown that in comparison with other multi-pulse rectifiers (MPR), it is cost-effective, its power factor is near unity and its rating is about 24% of the load rating. Therefore, the proposed 36-PR can be considered as a practical solution for industrial applications.

ACS Style

Rohollah Abdollahi; Gevork B. Gharehpetian; Amjad Anvari-Moghaddam; Frede Blaabjerg. Pulse Tripling Circuit and Twelve Pulse Rectifier Combination for Sinusoidal Input Current. IEEE Access 2021, 9, 103588 -103599.

AMA Style

Rohollah Abdollahi, Gevork B. Gharehpetian, Amjad Anvari-Moghaddam, Frede Blaabjerg. Pulse Tripling Circuit and Twelve Pulse Rectifier Combination for Sinusoidal Input Current. IEEE Access. 2021; 9 ():103588-103599.

Chicago/Turabian Style

Rohollah Abdollahi; Gevork B. Gharehpetian; Amjad Anvari-Moghaddam; Frede Blaabjerg. 2021. "Pulse Tripling Circuit and Twelve Pulse Rectifier Combination for Sinusoidal Input Current." IEEE Access 9, no. : 103588-103599.

Journal article
Published: 16 July 2021 in IEEE Access
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This paper presents an effective model predictive control (MPC) method for single-phase three-level T-type inverter-based shunt active power filters (SAPFs). The SAPF using T-type inverter topology has not been reported in the literature yet. Contrary to most of the existing MPC methods, the proposed MPC method eliminates the need for using weighting factor and additional constraints required for balancing dc capacitor voltages in the cost function. The design of cost function is based on the energy function. Since the factor used in the formulation of the energy function does not have any adverse influence on the performance of the system, the cost function becomes weighting factor free. The weighting factor free based MPC brings simplicity in the practical implementation. The effectiveness of the proposed MPC method has been investigated in steady-state as well as dynamic transients caused by load changes. The theoretical considerations are verified through experimental studies performed on a 3 kVA system.

ACS Style

Hasan Komurcugil; Sertac Bayhan; Naki Guler; Frede Blaabjerg. An Effective Model Predictive Control Method With Self-Balanced Capacitor Voltages for Single-Phase Three-Level Shunt Active Filters. IEEE Access 2021, 9, 103811 -103821.

AMA Style

Hasan Komurcugil, Sertac Bayhan, Naki Guler, Frede Blaabjerg. An Effective Model Predictive Control Method With Self-Balanced Capacitor Voltages for Single-Phase Three-Level Shunt Active Filters. IEEE Access. 2021; 9 ():103811-103821.

Chicago/Turabian Style

Hasan Komurcugil; Sertac Bayhan; Naki Guler; Frede Blaabjerg. 2021. "An Effective Model Predictive Control Method With Self-Balanced Capacitor Voltages for Single-Phase Three-Level Shunt Active Filters." IEEE Access 9, no. : 103811-103821.

Original research paper
Published: 16 July 2021 in IET Energy Systems Integration
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The transition to renewable energy-based power systems is fast progressing. One of the main challenges in keeping a power system with high operational reliability is to maintain the system frequency. As synchronous generator units are being replaced with power-electronic converters, the rotating mass and the system inertia are decreasing. Virtual synchronous machine (VSM) control is a modern control technique that aims to compensate for the reduction in inertia. The usage of power electronic-based converter units equipped with VSM control has to be managed and scheduled by system operators. An assessment of the operational frequency reliability is used to evaluate different service usages. A method is proposed that allows the comparison of different frequency management strategies. The proposed method uses fuzzy logic to evaluate the system risk for abnormal frequency and the system effort in the form of frequency control usage. This allows to quickly compare different frequency management strategies whilst keeping in mind many different reliability indices. The proposed method is validated with a modified IEEE Reliability Test System with integrated wind power capacity.

ACS Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. Fuzzy‐based frequency security evaluation of wind‐integrated power systems. IET Energy Systems Integration 2021, 1 .

AMA Style

Joachim Steinkohl, Saeed Peyghami, Xiongfei Wang, Pooya Davari, Frede Blaabjerg. Fuzzy‐based frequency security evaluation of wind‐integrated power systems. IET Energy Systems Integration. 2021; ():1.

Chicago/Turabian Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. 2021. "Fuzzy‐based frequency security evaluation of wind‐integrated power systems." IET Energy Systems Integration , no. : 1.

Journal article
Published: 13 July 2021 in Energies
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DC-connected parallel inverter systems are gaining popularity in industrial applications. However, such parallel systems generate excess current ripple (harmonics) at the DC-link due to harmonic interactions between the inverters in addition to the harmonics from the PWM switching. These DC-link harmonics cause the failure of fragile components such as DC-link capacitors. This paper proposes an interleaving scheme to minimize the current harmonics induced in the DC-link of such a system. First, the optimal phase-shift angle for the carrier signal is investigated using the analytical equations, which provides maximum capacitor current ripple cancellation (i.e., at the main switching frequency harmonic component). These optimally phase-shifted switching cycles lead to variations of the output current ripples, which, when summed together at the DC-link, result in the cancellations of the DC-link current ripples. The results show that when the carrier waves of the two inverters are phase-shifted by a 90° angle, the maximum high-frequency harmonic ripple cancellation occurs, which reduces the overall root-mean-square (RMS) value of the DC-capacitor current by almost 50%. The outcome of this proposed solution is a cost-effective DC-harmonics mitigating strategy for the industrial designers to practically configure multi-inverter systems, even when most of the drives are not operating at rated power levels. The experimental and simulation results presented in this paper verify the effectiveness of the proposed carrier-based phase-shifting scheme for two different configurations of common DC connected multi-converter systems.

ACS Style

Silpa Baburajan; Haoran Wang; Dinesh Kumar; Qian Wang; Frede Blaabjerg. DC-Link Current Harmonic Mitigation via Phase-Shifting of Carrier Waves in Paralleled Inverter Systems. Energies 2021, 14, 4229 .

AMA Style

Silpa Baburajan, Haoran Wang, Dinesh Kumar, Qian Wang, Frede Blaabjerg. DC-Link Current Harmonic Mitigation via Phase-Shifting of Carrier Waves in Paralleled Inverter Systems. Energies. 2021; 14 (14):4229.

Chicago/Turabian Style

Silpa Baburajan; Haoran Wang; Dinesh Kumar; Qian Wang; Frede Blaabjerg. 2021. "DC-Link Current Harmonic Mitigation via Phase-Shifting of Carrier Waves in Paralleled Inverter Systems." Energies 14, no. 14: 4229.

Journal article
Published: 09 July 2021 in IEEE Systems Journal
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This article investigates the relationships between the pole-to-pole fault current and the topology in the bipolar voltage sourced converter (VSC)–high-voltage dc (HVdc) grid. Based on the improved high-frequency equivalent model, it is found that the pole-to-pole fault current value is significantly influenced by the grid topologies, which is different from the situation in symmetrical monopole dc grid. It is also found that only the adjacent converters and the subadjacent converters of the fault lines will impact the fault currents, while the other converters with longer electrical distances basically have negligible contribution to the fault current. According to above mechanism, the simplified index is also proposed in this article to evaluate the fault current level of dc grid efficiently when its topology varies. The proposed index can make evaluations by simple calculations between different topologies and avoid solving complex differential equations one by one when pole-to-pole fault occurs at different lines. Based on the practical evaluation index, the genetic algorithm is used to optimize the dc grid topology to limit the fault current level. Finally, the simulation verification is performed based on the six-terminal bipolar VSC–HVdc grids, and some suggestions on topology design are given.

ACS Style

Yan Tao; Baohong Li; Tianqi Liu; Qin Jiang; Frede Blaabjerg. Practical Fault Current Level Evaluation and Limiting Method of Bipolar HVdc Grid Based on Topology Optimization. IEEE Systems Journal 2021, PP, 1 -11.

AMA Style

Yan Tao, Baohong Li, Tianqi Liu, Qin Jiang, Frede Blaabjerg. Practical Fault Current Level Evaluation and Limiting Method of Bipolar HVdc Grid Based on Topology Optimization. IEEE Systems Journal. 2021; PP (99):1-11.

Chicago/Turabian Style

Yan Tao; Baohong Li; Tianqi Liu; Qin Jiang; Frede Blaabjerg. 2021. "Practical Fault Current Level Evaluation and Limiting Method of Bipolar HVdc Grid Based on Topology Optimization." IEEE Systems Journal PP, no. 99: 1-11.

Journal article
Published: 06 July 2021 in Applied Sciences
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This paper proposes a nonlinear decoupled current control scheme for a grid-connected inverter with LCL filter. Decoupling the active and reactive current control channels is one of the main demands in the control of inverters. For inverters with an L filter, the decoupling can be achieved by a proper feed-forward of grid voltages. However, the coupling of channels is a complex issue for converters with LCL filters. The resonance mode of the LCL filter may cause instability, which adds more complexity to the analysis. In this paper, state equations of the system are provided, which highlight the coupling between active and reactive currents injected into the grid. Accordingly, a non-linear control scheme is proposed which effectively decouples the channels and dampens the resonant modes of the LCL filter. The stability of the proposed control method is verified by the Lyapunov criterion. Independency of the system stability to the grid-impedance is another feature of the proposed approach. Moreover, only grid-side currents are needed for implementation of the proposed scheme, avoiding the need for additional current sensors for the output capacitor and grid-side inductor. For accurate modelling of the inverter, the computation and PWM sampling delays are included in the controller design. Finally, various case studies are provided that verify the performance of the proposed approach and the stability of the system.

ACS Style

Mohamad Ghasemi; Seyed Zarei; Saeed Peyghami; Frede Blaabjerg. A Theoretical Concept of Decoupled Current Control Scheme for Grid-Connected Inverter with L-C-L Filter. Applied Sciences 2021, 11, 6256 .

AMA Style

Mohamad Ghasemi, Seyed Zarei, Saeed Peyghami, Frede Blaabjerg. A Theoretical Concept of Decoupled Current Control Scheme for Grid-Connected Inverter with L-C-L Filter. Applied Sciences. 2021; 11 (14):6256.

Chicago/Turabian Style

Mohamad Ghasemi; Seyed Zarei; Saeed Peyghami; Frede Blaabjerg. 2021. "A Theoretical Concept of Decoupled Current Control Scheme for Grid-Connected Inverter with L-C-L Filter." Applied Sciences 11, no. 14: 6256.

Original research paper
Published: 06 July 2021 in IET Power Electronics
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To increase the power rating and reduce the cost and complexity of a multi-pulse rectifier (MPR), it is well known that the pulse number must be increased. In some practical cases, a 12-pulse rectifier (12PR) is suggested as a good solution considering its relatively simple structure and low weight. However, 12-pulse rectifiers cannot technically meet the standards of harmonic distortion requirements for some industrial applications, and therefore they must be used along with output filters. Two cost-effective 24-pulse rectifiers (24PRs) are suggested in the article, which consist of a polygon autotransformer 12PR and two pulse doubling circuits (PDCs) at dc link. The first PDC (PDC1) is based on an inter-phase transformer (IPT) with a step-up secondary winding, and the second one (PDC2) is based on an IPT with a step-down secondary winding. To show the advantages of the proposed combinations compared with other solutions, simulation results are used, and also a prototype is implemented to evaluate and verify the simulation results. The simulation and experimental test results show that the total harmonic distortion (%THD) of the input current for the 12PR with PDC1 is less than 3.67%, and the 12PR with PDC2 is less than 1.45%, which meets the IEEE 519 and DO-160G requirements. Also, it is shown that in comparison with other solutions, the proposed two configurations are cost-effective, power factor is near unity, rating is almost 29% of the load rating, and the efficiency is almost 97.5%, which makes them a practical solution for more electric aircraft.

ACS Style

R. Abdollahi; G. B. Gharehpetian; A. Anvari‐Moghaddam; F. Blaabjerg. An improved 24‐pulse rectifier for harmonic mitigation in more electric aircraft. IET Power Electronics 2021, 14, 2007 -2020.

AMA Style

R. Abdollahi, G. B. Gharehpetian, A. Anvari‐Moghaddam, F. Blaabjerg. An improved 24‐pulse rectifier for harmonic mitigation in more electric aircraft. IET Power Electronics. 2021; 14 (11):2007-2020.

Chicago/Turabian Style

R. Abdollahi; G. B. Gharehpetian; A. Anvari‐Moghaddam; F. Blaabjerg. 2021. "An improved 24‐pulse rectifier for harmonic mitigation in more electric aircraft." IET Power Electronics 14, no. 11: 2007-2020.

Journal article
Published: 02 July 2021 in Energies
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This paper proposes an intelligent seamless transition controller for smooth transition between grid-connected (GC) and standalone modes of distributed generation (DG) units in the grid. The development of this seamless controller contributes to two main processes in the transition modes: the synchronization process and an islanding process. For the synchronization process, the stationary reference frame phase-locked loop (SRF-PLL) associated with the voltage source inverter (VSI) is modified using the frequency, voltage deviation, and phase angle information. Furthermore, the islanding process is classified as intentional and unintentional islanding scenarios for achieving efficient transition control. Here, the intentional islanding process is achieved with the information that is available in the system due to the planned disconnection. For the unintentional islanding process, a fuzzy inference system (FIS) is used to modify the conventional droop control using the information of change in active power, voltage, and frequency. To identify the action of the proposed approach during the transition process, numerical simulations are conducted with the hardware-in-loop (HIL) simulator by developing a 10kWp three-phase grid-connected DG system. The results identified the efficient control of the VSI for both islanding and grid connection processes. In the islanding conditions, the proposed controller provides advantage with less detection and disconnection time, and during synchronization, it instantly minimizes the phase-angle deviation to achieve efficient control.

ACS Style

Mohammed Khan; Ahteshamul Haque; Frede Blaabjerg; Varaha Kurukuru; Huai Wang. Intelligent Transition Control between Grid-Connected and Standalone Modes of Three-Phase Grid-Integrated Distributed Generation Systems. Energies 2021, 14, 3979 .

AMA Style

Mohammed Khan, Ahteshamul Haque, Frede Blaabjerg, Varaha Kurukuru, Huai Wang. Intelligent Transition Control between Grid-Connected and Standalone Modes of Three-Phase Grid-Integrated Distributed Generation Systems. Energies. 2021; 14 (13):3979.

Chicago/Turabian Style

Mohammed Khan; Ahteshamul Haque; Frede Blaabjerg; Varaha Kurukuru; Huai Wang. 2021. "Intelligent Transition Control between Grid-Connected and Standalone Modes of Three-Phase Grid-Integrated Distributed Generation Systems." Energies 14, no. 13: 3979.

Journal article
Published: 01 July 2021 in IEEE Systems Journal
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Direct current (DC) microgrids can be considered as cyber-physical systems due to implementation of measurement devices, communication network, and control layers. Consequently, dc microgrids are also vulnerable to cyber-attacks. False-data injection attacks (FDIAs) are a common type of cyber-attacks, which try to inject false data into the system in order to cause the defective behavior. This article proposes a method based on model predictive control (MPC) and artificial neural networks (ANNs) to detect and mitigate the FDIA in dc microgrids that are formed by parallel dc–dc converters. The proposed MPC/ANN-based strategy shows how MPC and ANNs can be coordinated to provide a secure control layer to detect and remove the FDIAs in the dc microgrid. In the proposed strategy, an ANN plays the role of the estimator to implement in the cyber-attack detection and mitigation strategy. The proposed method is examined under different conditions, physical events and cyber disturbances (i.e. load changing and communication delay, and time-varying attack), and the results of the MPC-based scheme is compared with conventional proportional-integral controllers. The obtained results show the effectiveness of the proposed strategy to detect and mitigate the attack in dc microgrids.

ACS Style

Mohammad Reza Habibi; Hamid Reza Baghaee; Frede Blaabjerg; Tomislav Dragicevic. Secure MPC/ANN-Based False Data Injection Cyber-Attack Detection and Mitigation in DC Microgrids. IEEE Systems Journal 2021, PP, 1 -12.

AMA Style

Mohammad Reza Habibi, Hamid Reza Baghaee, Frede Blaabjerg, Tomislav Dragicevic. Secure MPC/ANN-Based False Data Injection Cyber-Attack Detection and Mitigation in DC Microgrids. IEEE Systems Journal. 2021; PP (99):1-12.

Chicago/Turabian Style

Mohammad Reza Habibi; Hamid Reza Baghaee; Frede Blaabjerg; Tomislav Dragicevic. 2021. "Secure MPC/ANN-Based False Data Injection Cyber-Attack Detection and Mitigation in DC Microgrids." IEEE Systems Journal PP, no. 99: 1-12.

Journal article
Published: 29 June 2021 in IEEE Transactions on Power Electronics
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Multibus dc microgrids, which combine renewable energy sources, energy storage systems and loads, have voltage stability requirement, which solicits increasing research attention in practice. Potentially complex architectures of the multibus dc microgrids make it difficult to evaluate the stability using the conventional stability criteria. In this paper, some constraints related to the conventional stability criteria, such as right-half-plane (RHP) poles or zeros in the subsystems are discussed. Further, an impedance-based stability criterion is proposed in the light of generalized bode plots for multibus dc microgrids. The configuration of the multibus dc microgrid is simplified by adopting generalized voltage source, generalized current source and two-port model. Then, impedances or admittances for each bus port can be derived, being helpful for assessing stability of the system. The stability of each bus port in the multibus dc microgrid can be evaluated separately. The stability method considers the number of RHP pole of the open-loop transfer function for the system so the stability of the system consists of subsystems with RHP pole and zero can be analyzed correctly. The method can be easily extended and is acting as a generalized approach for different configurations. Experiments are done to validate the effectiveness of the criterion.

ACS Style

Minrui Leng; Guohua Zhou; Haoze Li; Guodong Xu; Frede Blaabjerg; Tomislav Gae Dragicevic. Impedance-Based Stability Evaluation for Multibus DC Microgrid Without constraints on Subsystems. IEEE Transactions on Power Electronics 2021, PP, 1 -1.

AMA Style

Minrui Leng, Guohua Zhou, Haoze Li, Guodong Xu, Frede Blaabjerg, Tomislav Gae Dragicevic. Impedance-Based Stability Evaluation for Multibus DC Microgrid Without constraints on Subsystems. IEEE Transactions on Power Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Minrui Leng; Guohua Zhou; Haoze Li; Guodong Xu; Frede Blaabjerg; Tomislav Gae Dragicevic. 2021. "Impedance-Based Stability Evaluation for Multibus DC Microgrid Without constraints on Subsystems." IEEE Transactions on Power Electronics PP, no. 99: 1-1.

Journal article
Published: 25 June 2021 in IEEE Transactions on Power Delivery
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The missing capability of DC fault current limitation is an inherent disadvantage in the typical half-bridge modular multilevel converter (MMC), which restricts its application in long-distance high voltage direct current (HVDC) systems. The full-bridge submodule (FBSM) and clamped double submodule (CDSM) topologies allow for fault current self-clearing, but also suffer from additional hardware cost and power losses. In this paper, an improved submodule topology utilizing the new reverse-blocking insulated gate bipolar transistor (RB-IGBT) is proposed in order to improve system economy without compromising its safety. The operating principles and DC fault characteristics of the proposed topology are analyzed in details, including comparison with various topologies in terms of cost, losses and performance. Compared with the traditional CDSM topology, the proposed RBSM can limit fault current faster with reduced number of switching devices. A DC fault protection strategy for MMC-HVDC system is also presented. Simulation results under normal and fault operating conditions are carried out to verify the effectiveness of the proposed topology.

ACS Style

Yonghui Song; Yongjie Luo; Xiaofu Xiong; Frede Blaabjerg; Wei Wang. An Improved Submodule Topology of MMC with Fault Blocking Capability Based on Reverse-Blocking Insulated Gate Bipolar Transistor. IEEE Transactions on Power Delivery 2021, PP, 1 -1.

AMA Style

Yonghui Song, Yongjie Luo, Xiaofu Xiong, Frede Blaabjerg, Wei Wang. An Improved Submodule Topology of MMC with Fault Blocking Capability Based on Reverse-Blocking Insulated Gate Bipolar Transistor. IEEE Transactions on Power Delivery. 2021; PP (99):1-1.

Chicago/Turabian Style

Yonghui Song; Yongjie Luo; Xiaofu Xiong; Frede Blaabjerg; Wei Wang. 2021. "An Improved Submodule Topology of MMC with Fault Blocking Capability Based on Reverse-Blocking Insulated Gate Bipolar Transistor." IEEE Transactions on Power Delivery PP, no. 99: 1-1.

Review
Published: 23 June 2021 in Electronics
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The hybrid three-phase rectifiers (HTR) consist of parallel associations of two rectifiers (rectifier 1 and rectifier 2), each one of them with a distinct operation, while the sum of their input currents forms a sinusoidal or multilevel waveform. In general, rectifier 1 is a GRAETZ (full bridge) (can be combined with a BOOST converter) and rectifier 2 is combined with a DC-DC converter. In this HTR contest, this paper is intended to answer some important questions about those hybrid rectifiers. To obtain the correct answers, the study is conducted as an analysis of a systematic literature review. Thus, a search was carried out in the databases, mostly IEEE and IET, and 34 papers were selected as the best corresponding to the HTR theme. It is observed that the preferred form of power distribution in unidirectional hybrid three-phase rectifiers (UHTR) is 55%Po (rectifier 1) and 45%Po (rectifier 2). For the bidirectional hybrid three-phase rectifiers (BHTR), rectifier 1 preferably takes 90% of Po and 10% of Po is processed by rectifier 2. It is also observed that the UHTR that employ the single-ended primary-inductor converter (SEPIC) or VIENNA converter topologies in rectifier 2 can present sinusoidal input currents with low total harmonic distortion (THD) and high Power Factor (PF), even successfully complying with the international standards. The same can be said about the rectifier that employs a pulse-width (PWM) converter of BOOST topology in rectifier 2. In short, the HTR are interesting because they allow using the GRAETZ full bridge topology in rectifier 1, thus taking advantage of its characteristics, being simple, robust, and reliable. At the same time, the advantages of rectifier 2, i.e., high PF and low THD, are well used. In addition, this article also points out the future direction of research that is still unexplored in the literature, thus giving opportunities for future innovation.

ACS Style

José Gonçalves; Stanimir Valtchev; Rui Melicio; Alcides Gonçalves; Frede Blaabjerg. Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review. Electronics 2021, 10, 1520 .

AMA Style

José Gonçalves, Stanimir Valtchev, Rui Melicio, Alcides Gonçalves, Frede Blaabjerg. Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review. Electronics. 2021; 10 (13):1520.

Chicago/Turabian Style

José Gonçalves; Stanimir Valtchev; Rui Melicio; Alcides Gonçalves; Frede Blaabjerg. 2021. "Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review." Electronics 10, no. 13: 1520.

Journal article
Published: 22 June 2021 in IEEE Transactions on Power Electronics
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This letter focuses on resilient synchronization in networked AC microgrids under cyber-attacks, where attackers aim to desynchronize converters by injecting bounded false data to communication and control channels. To this end, a resilient cooperative control framework for the secondary frequency regulation in AC microgrids is developed. The proposed resilient distributed control strategy achieves synchronization regardless of the existence of cyber-attacks. Moreover, it offers the maximum level of resilience, i.e. it guarantees resilient synchronization even if all distributed generation units in microgrids are subject to cyber-attacks. Theoretical analysis and verification case studies are carried out in order to demonstrate the advantages and performance of the proposed resilient cooperative control.

ACS Style

Mahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. A Fully Resilient Cyber-Secure Synchronization Strategy for AC Microgrids. IEEE Transactions on Power Electronics 2021, 36, 13372 -13378.

AMA Style

Mahdieh S. Sadabadi, Subham Sahoo, Frede Blaabjerg. A Fully Resilient Cyber-Secure Synchronization Strategy for AC Microgrids. IEEE Transactions on Power Electronics. 2021; 36 (12):13372-13378.

Chicago/Turabian Style

Mahdieh S. Sadabadi; Subham Sahoo; Frede Blaabjerg. 2021. "A Fully Resilient Cyber-Secure Synchronization Strategy for AC Microgrids." IEEE Transactions on Power Electronics 36, no. 12: 13372-13378.

Journal article
Published: 16 June 2021 in IEEE Transactions on Industrial Electronics
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Parameter design is significant in ensuring a satisfactory holistic performance of power converters. Generally, circuit parameter design for power converters consists of two processes: analysis and deduction process and optimization process. The existing approaches for parameter design consist of two types: traditional approach, computer-aided optimization (CAO) approach. In the traditional approaches, heavy human-dependence is required. Even though the emerging CAO approaches automate the optimization process, they still require manual analysis and deduction process. To mitigate human-dependence for the sake of high accuracy and easy implementation, an artificial-intelligence-based design (AI-D) approach is proposed in this paper for the parameter design of power converters. In the proposed AI-D approach, and batch-normalization neural network (BN-NN) are adopted to replace manual analysis process and genetic algorithm is used to search for optimal design results. The proposed AI-D approach has been validated in design of the synchronous Buck converter in the 48 V to 12 V accessory-load power supply system in electric vehicle. The design case of an efficiency-optimal synchronous Buck converter with constraints in volume, voltage ripple and current ripple is provided. In the end of this paper, feasibility and accuracy of the proposed AI-D approach have been validated by hardware experiments.

ACS Style

Xinze Li; Xin Zhang; Fanfan Lin; Frede Blaabjerg. Artificial-Intelligence-Based Design (AI-D) for Circuit Parameters of Power Converters. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.

AMA Style

Xinze Li, Xin Zhang, Fanfan Lin, Frede Blaabjerg. Artificial-Intelligence-Based Design (AI-D) for Circuit Parameters of Power Converters. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Xinze Li; Xin Zhang; Fanfan Lin; Frede Blaabjerg. 2021. "Artificial-Intelligence-Based Design (AI-D) for Circuit Parameters of Power Converters." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.