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Prof. Pooya DAVARI
Aalborg University

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0 PFC
0 Power Electronics
0 Power Quality
0 Electromagnetic interference (EMI) filter
0 ac-dc converter

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Power Quality
Power Electronics
PFC
Electromagnetic interference (EMI) filter
ac-dc converter

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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.

Original research paper
Published: 02 May 2021 in IET Renewable Power Generation
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Power grids with high integration of power electronic converters face new issues that have not existed before. The frequency in the power system is highly related to the inertia and the rotational speed of the operational synchronous machines. This is now changing, as the converter‐based generation units are contributing increasingly to the balancing of active power in the modern power grid. Several frequency control designs for the power electronic‐based generation units have been presented in the past. However, optimal control structures and settings are dependent on the current power grid parameters and operation. The converter‐based units allow the transmission system operators to change their behaviour according to their grid requirements much more dynamical than ever before. The paper proposes a new analysis framework that can be utilized to find the best‐suited control settings in converter‐based units to enhance the system frequency reliability. The proposed framework is demonstrated in a study case by varying the settings of one frequency control scheme currently used in wind power plants in the Danish grid codes and validated on the IEEE 24‐Bus reliability test system with additional wind power integration.

ACS Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. Frequency security constrained control of power electronic‐based generation systems. IET Renewable Power Generation 2021, 1 .

AMA Style

Joachim Steinkohl, Saeed Peyghami, Xiongfei Wang, Pooya Davari, Frede Blaabjerg. Frequency security constrained control of power electronic‐based generation systems. IET Renewable Power Generation. 2021; ():1.

Chicago/Turabian Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. 2021. "Frequency security constrained control of power electronic‐based generation systems." IET Renewable Power Generation , no. : 1.

Journal article
Published: 01 May 2021 in IEEE Transactions on Power Electronics
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ACS Style

Zhengge Chen; Bochen Liu; Yongheng Yang; Pooya Davari; Huai Wang. Bridgeless PFC Topology Simplification and Design for Performance Benchmarking. IEEE Transactions on Power Electronics 2021, 36, 5398 -5414.

AMA Style

Zhengge Chen, Bochen Liu, Yongheng Yang, Pooya Davari, Huai Wang. Bridgeless PFC Topology Simplification and Design for Performance Benchmarking. IEEE Transactions on Power Electronics. 2021; 36 (5):5398-5414.

Chicago/Turabian Style

Zhengge Chen; Bochen Liu; Yongheng Yang; Pooya Davari; Huai Wang. 2021. "Bridgeless PFC Topology Simplification and Design for Performance Benchmarking." IEEE Transactions on Power Electronics 36, no. 5: 5398-5414.

Journal article
Published: 18 March 2021 in Applied Sciences
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Interleaved power factor correction (PFC) is widely used circuit topology due to good efficiency and power density for single-switch boost PFC. As the differential mode (DM) electromagnetic interference (EMI) noise magnitude depends upon the input current ripple, this research details a comprehensive study of DM EMI filter design for interleaved boost PFC with the aim of minimizing the component size. It is also demonstrated that the different numbers of interleaved stages and switching frequency influence the filter attenuation requirement and, thus, the EMI filter size. First, an analytical model is derived on the basis of the Norton equivalent circuit model for the differential mode noises of interleaved boost PFC within the frequency range of 9–500 kHz. The derived model can help identify the proper phase shifting among the interleaved boost converters in order to minimize the considered differential mode noises at the filter design frequency. So, a novel phase-shift method is developed to get a minimized attenuation required by a filter in Band B. Further, a volume optimization of the required DM filter was introduced based on the calculated filter attenuation and volumetric component parameters. Based on the obtained results, unconventional and conventional phase shifts have demonstrated a good performance in decreasing the EMI filter volume in Band B and Band A, respectively. A 2-kW interleaved PFC case study is presented to verify the theoretical analyses and the impact of phase-shifting on EMI filter size.

ACS Style

Naser Nourani Esfetanaj; Huai Wang; Frede Blaabjerg; Pooya Davari. Differential Mode Noise Estimation and Filter Design for Interleaved Boost Power Factor Correction Converters. Applied Sciences 2021, 11, 2716 .

AMA Style

Naser Nourani Esfetanaj, Huai Wang, Frede Blaabjerg, Pooya Davari. Differential Mode Noise Estimation and Filter Design for Interleaved Boost Power Factor Correction Converters. Applied Sciences. 2021; 11 (6):2716.

Chicago/Turabian Style

Naser Nourani Esfetanaj; Huai Wang; Frede Blaabjerg; Pooya Davari. 2021. "Differential Mode Noise Estimation and Filter Design for Interleaved Boost Power Factor Correction Converters." Applied Sciences 11, no. 6: 2716.

Journal article
Published: 17 March 2021 in IEEE Journal of Emerging and Selected Topics in Industrial Electronics
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High penetration of power electronics due to the concentration of switching frequency in the range of 9-150 kHz, may create new challenging issues. Currently, regarding the recent version standard (IEC 61000-6-3), there is a lack of enough insight and fundamental studies despite reported Electromagnetic Interference (EMI) noise problems in this frequency range. Hence, this paper proposes a time-frequency analytical modeling method for characterizing Differential Mode (DM) noise in a single-phase Power Factor Correction (PFC) converter in this new frequency range. The provided comparative simulation analysis shows the proposed method's ability to estimate DM noise with a 9-150 kHz frequency range at high accuracy utilizing the double Fourier analysis method. Moreover, the obtained experimental results on a 1 kW single-phase boost PFC converter validate the proposed EMI modeling approach's effectiveness, demonstrating an error of less than 1.8 dB for the considered experimental case studies.

ACS Style

Naser Nourani Esfetanaj; Huai Wang; Frede Blaabjerg; Pooya Davari. Differential mode noise prediction and analysis in single-phase boost PFC for the new frequency range of 9- 150 kHz. IEEE Journal of Emerging and Selected Topics in Industrial Electronics 2021, PP, 1 -1.

AMA Style

Naser Nourani Esfetanaj, Huai Wang, Frede Blaabjerg, Pooya Davari. Differential mode noise prediction and analysis in single-phase boost PFC for the new frequency range of 9- 150 kHz. IEEE Journal of Emerging and Selected Topics in Industrial Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Naser Nourani Esfetanaj; Huai Wang; Frede Blaabjerg; Pooya Davari. 2021. "Differential mode noise prediction and analysis in single-phase boost PFC for the new frequency range of 9- 150 kHz." IEEE Journal of Emerging and Selected Topics in Industrial Electronics PP, no. 99: 1-1.

Preprint
Published: 17 February 2021
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Interleaved power factor correction (PFC) is widely used circuit topology due to good efficiency and power density for single-switch boost PFC. As the differential mode (DM) electromagnetic interference (EMI) noise magnitude depends upon the input current ripple, this research details a comprehensive study of DM EMI filter design for interleaved boost PFC with the aim of minimizing the component size. It is also demonstrated that the different numbers of interleaved stages and switching frequency influence the filter attenuation requirement and, thus, the EMI filter size. First, an analytical model is derived on the basis of the Norton equivalent circuit model for the differential mode noises of interleaved boost PFC within the frequency range of 9-500 kHz. The derived model can help identify the optimal phase shifting among the interleaved boost converters in order to minimize the considered differential mode noises at the filter design frequency. So, a novel phase-shift method is developed to get a minimized attenuation required by a filter in Band B. Further, a volume optimization of the required DM filter was introduced based on the calculated filter attenuation and volumetric component parameters. Based on the obtained results, unconventional and conventional phase shifts have demonstrated a good performance in decreasing the EMI filter volume in Band B and Band A, respectively. A 2-kW interleaved PFC case study is presented to verify the theoretical analyses and the impact of phase-shifting on EMI filter size.

ACS Style

Naser Nourani Esfetanaj; Huai Wang; Frede Blaabjerg; Pooya Davari. DM Noise Estimation and DM EMI Filter Design for Interleaved Boost PFC Converters. 2021, 1 .

AMA Style

Naser Nourani Esfetanaj, Huai Wang, Frede Blaabjerg, Pooya Davari. DM Noise Estimation and DM EMI Filter Design for Interleaved Boost PFC Converters. . 2021; ():1.

Chicago/Turabian Style

Naser Nourani Esfetanaj; Huai Wang; Frede Blaabjerg; Pooya Davari. 2021. "DM Noise Estimation and DM EMI Filter Design for Interleaved Boost PFC Converters." , no. : 1.

Journal article
Published: 13 January 2021 in Applied Sciences
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The three-phase inductor and capacitor filter (LC)-filtered voltage source inverter (VSI) is subjected to uncertain and time-variant parameters and disturbances, e.g., due to aging, thermal effects, and load changes. These uncertainties and disturbances have a considerable impact on the performance of a VSI’s control system. It can degrade system performance or even cause system instability. Therefore, considering the effects of all system uncertainties and disturbances in the control system design is necessary. In this respect and to tackle this issue, this paper proposes an adaptive model predictive control (MPC), which consists of three main parts: an MPC, an augmented state-space model, and an adaptive observer. The augmented state-space model considers all system uncertainties and disturbances and lumps them into two disturbance inputs. The proposed adaptive observer determines the lumped disturbance functions, enabling the control system to keep the nominal system performance under different load conditions and parameters uncertainty. Moreover, it provides load-current-sensorless operation of MPC, which reduces the size and cost, and simultaneously improves the system reliability. Finally, MPC selects the proper converter voltage vector that minimizes the tracking errors based on the augmented model and outputs of the adaptive observer. Simulations and experiments on a 5 kW VSI examine the performance of the proposed adaptive MPC under different load conditions and parameter uncertainties and compare them with the conventional MPC.

ACS Style

Hosein Gholami-Khesht; Pooya Davari; Frede Blaabjerg. An Adaptive Model Predictive Voltage Control for LC-Filtered Voltage Source Inverters. Applied Sciences 2021, 11, 704 .

AMA Style

Hosein Gholami-Khesht, Pooya Davari, Frede Blaabjerg. An Adaptive Model Predictive Voltage Control for LC-Filtered Voltage Source Inverters. Applied Sciences. 2021; 11 (2):704.

Chicago/Turabian Style

Hosein Gholami-Khesht; Pooya Davari; Frede Blaabjerg. 2021. "An Adaptive Model Predictive Voltage Control for LC-Filtered Voltage Source Inverters." Applied Sciences 11, no. 2: 704.

Conference paper
Published: 06 November 2020 in Proceedings of the IEEE
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The electrification of the transportation sector is moving on at a fast pace. All car manufacturers have strong programs to electrify their car fleet to fulfill the demands of society and customers by offering carbon-neutral technologies to bring goods and persons from one location to another. Power electronics technology is, in this evolution, essential and also in a rapid development technology-wise. Some of the introduced technologies are quite mature, and the systems designed must have high reliability as they can be quite complicated from an electrical perspective. Therefore, this article focuses on the reliability of the used power electronic systems applied in electric vehicles (EVs) and hybrid EVs (HEVs). It introduces the reliability requirements and challenges given for the power electronics applied in EV/HEV applications. Then, the advances in power electronic components to address the reliability challenges are introduced as they individually contribute to the overall system reliability. The reliability-oriented design methodology is also discussed, including two examples: an EV onboard charger and the drive train inverter. Finally, an outlook in terms of research opportunities in power electronics reliability related to EV/HEVs is provided. It can be concluded that many topics are already well handled in terms of reliability, but issues related to complete new technology introduction are important to keep the focus on.

ACS Style

Frede Blaabjerg; Huai Wang; Ionut Vernica; Bochen Liu; Pooya Davari. Reliability of Power Electronic Systems for EV/HEV Applications. Proceedings of the IEEE 2020, 109, 1060 -1076.

AMA Style

Frede Blaabjerg, Huai Wang, Ionut Vernica, Bochen Liu, Pooya Davari. Reliability of Power Electronic Systems for EV/HEV Applications. Proceedings of the IEEE. 2020; 109 (6):1060-1076.

Chicago/Turabian Style

Frede Blaabjerg; Huai Wang; Ionut Vernica; Bochen Liu; Pooya Davari. 2020. "Reliability of Power Electronic Systems for EV/HEV Applications." Proceedings of the IEEE 109, no. 6: 1060-1076.

Research article
Published: 01 November 2020 in IET Power Electronics
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Grid-interfaced solar photovoltaic (GIPV) system requires a robust control algorithm for satisfactory operation under grid voltage disturbances. In this study, an application of Newton's learning rule-based total least-square estimation employing single-layer neural network structure is adopted to interface the photovoltaic unit with the utility grid. In addition, the weight-updating mechanism is uniquely integrated with threshold neuron for attaining speedy extraction of fundamental load current component. In particular, the proposed control algorithm has the capability to transfer maximum active power to the utility grid/AC load at unity power factor while operating as distribution static compensator to offer various ancillary services including current harmonics attenuation and reactive current suppression. This will lead to increased device utilisation factor of the overall GIPV system during night time (i.e. in the absence of solar irradiance). Moreover, the proposed control scheme is designed and developed without any complex transformations and derivative terms, which results in less computational intensiveness. The GIPV system with three-phase double-stage configuration is modelled in MATLAB/Simulink software using sim-power system tool. Finally, the adaptability of the proposed control algorithm has been verified and confirmed through 500 W laboratory prototype using low-cost Arm Cortex-M4 microcontroller under various operating conditions.

ACS Style

Ajay Kumar; Nirav Patel; Nitin Gupta; Vikas Gupta; Pooya Davari. Performance enhancement of photovoltaic system under grid voltage distortion utilising total least‐square control scheme. IET Power Electronics 2020, 13, 3044 -3055.

AMA Style

Ajay Kumar, Nirav Patel, Nitin Gupta, Vikas Gupta, Pooya Davari. Performance enhancement of photovoltaic system under grid voltage distortion utilising total least‐square control scheme. IET Power Electronics. 2020; 13 (14):3044-3055.

Chicago/Turabian Style

Ajay Kumar; Nirav Patel; Nitin Gupta; Vikas Gupta; Pooya Davari. 2020. "Performance enhancement of photovoltaic system under grid voltage distortion utilising total least‐square control scheme." IET Power Electronics 13, no. 14: 3044-3055.

Research article
Published: 01 November 2020 in IET Power Electronics
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This study proposes an optimised controllable pulse-width modulation (PWM) scheme suitable for multilevel inverters. Seeing the need for improving the output voltage characteristics such as total harmonic distortion, low-order harmonic and distortion factor, an improved harmonic injection PWM variable frequency triangular carrier modulation technique is employed for off-line mode. For this purpose, the carrier signal frequencies at each level (carrier-based), and also amplitudes and orders of the harmonic-injected signal (reference-based) are considered as controllable parameters. The proposed technique benefits are operating with considerably fewer numbers of the pulses per cycle, low switching losses, and improvement in the output voltage characteristics. However, selective harmonic elimination and optimal switching angles are the most common modulation techniques, but they employ only one angle as a control parameter at each level of the output waveform. Hence, the modulation scheme can consider more angles at each level as controllable parameters by applying multi-objective particle swarm optimisation and non-dominated sorting genetic algorithm II (NSGA-II). Simulations are conducted in 5-, 7- and 9-level inverter. Finally, the effectiveness of the studies is validated by obtaining experimental results on a single-phase 1 kW 7-level inverter prototype.

ACS Style

Mohammad Sadegh Orfi Yeganeh; Mohammad Sarvi; Frede Blaabjerg; Pooya Davari. Improved harmonic injection pulse‐width modulation variable frequency triangular carrier scheme for multilevel inverters. IET Power Electronics 2020, 13, 3146 -3154.

AMA Style

Mohammad Sadegh Orfi Yeganeh, Mohammad Sarvi, Frede Blaabjerg, Pooya Davari. Improved harmonic injection pulse‐width modulation variable frequency triangular carrier scheme for multilevel inverters. IET Power Electronics. 2020; 13 (14):3146-3154.

Chicago/Turabian Style

Mohammad Sadegh Orfi Yeganeh; Mohammad Sarvi; Frede Blaabjerg; Pooya Davari. 2020. "Improved harmonic injection pulse‐width modulation variable frequency triangular carrier scheme for multilevel inverters." IET Power Electronics 13, no. 14: 3146-3154.

Journal article
Published: 01 October 2020 in IET Power Electronics
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It is well-known that the presence of non-linear loads in the distribution system can impair the power quality. The problem becomes worse in microgrids and power electronic-based power systems as the increasing penetration of single-phase distributed generation may result in a more unbalanced grid voltage. Shunt active power filters (SAPFs) are used for improving the power quality and compensating for the unbalance grid voltage. This study presents a modification of the classical control structure based on the finite control set model predictive control (FCS-MPC). The proposed control structure can retain all the advantages of FCS-MPC, while improving the input current quality. Furthermore, a computationally efficient cost function based on only a single objective is introduced, and its effect on reducing the current ripple is demonstrated. The presented solution provides a fast response to the transients as well as compensates for the unbalanced grid voltage conditions. A straightforward single loop controller is compared to the conventional way of realising the active power filters, which is based on space vector pulse width modulation. The simulation results have been obtained from MATLAB/SIMULINK environment, while the obtained experimental results, utilising a 15 kVA power converter, highlight the effective performance of the proposed control scheme and verifies the introduced MPC-based method as a viable control solution for SAPFs.

ACS Style

Mohammed Alhasheem; Paolo Mattavelli; Pooya Davari. Harmonics mitigation and non‐ideal voltage compensation utilising active power filter based on predictive current control. IET Power Electronics 2020, 13, 2782 -2793.

AMA Style

Mohammed Alhasheem, Paolo Mattavelli, Pooya Davari. Harmonics mitigation and non‐ideal voltage compensation utilising active power filter based on predictive current control. IET Power Electronics. 2020; 13 (13):2782-2793.

Chicago/Turabian Style

Mohammed Alhasheem; Paolo Mattavelli; Pooya Davari. 2020. "Harmonics mitigation and non‐ideal voltage compensation utilising active power filter based on predictive current control." IET Power Electronics 13, no. 13: 2782-2793.

Journal article
Published: 14 September 2020 in Applied Sciences
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This paper proposes an enhanced finite control set model predictive control (FCS-MPC) strategy for voltage source converter (VSC) with a LC output filter. The proposed control scheme is based on tracking the voltage reference trajectory by using only a single-step prediction within the controller horizon. Besides, the suitability of different frequency control schemes with the proposed scheme to prevent from inherent variable switching behaviour of conventional FCS-MPC is investigated. Based on that, the proposed method targets two major factors influencing power quality in grid forming applications by enhancing the output voltage harmonic distortion and also preventing variable switching behaviour of FCS-MPC. Although compared to multi-step prediction approaches, only a single-step multi-objective cost function to improve computation efficiency is utilized, the introduced control schemes are able to deliver higher power quality compared to its counterpart methods as well. Furthermore, the effect of different applied cost functions on the transient response of the system is studied and investigated for the future use of the VSC in microgrids (MGs). The effectiveness of the proposed scheme was assessed by simulation using MATLAB/SIMULINK and experiment using a 5.5 kVA VSC module and the results were in good agreement.

ACS Style

Mohammed Alhasheem; Ahmed Abdelhakim; Frede Blaabjerg; Paolo Mattavelli; Pooya Davari. Model Predictive Control of Grid Forming Converters with Enhanced Power Quality. Applied Sciences 2020, 10, 6390 .

AMA Style

Mohammed Alhasheem, Ahmed Abdelhakim, Frede Blaabjerg, Paolo Mattavelli, Pooya Davari. Model Predictive Control of Grid Forming Converters with Enhanced Power Quality. Applied Sciences. 2020; 10 (18):6390.

Chicago/Turabian Style

Mohammed Alhasheem; Ahmed Abdelhakim; Frede Blaabjerg; Paolo Mattavelli; Pooya Davari. 2020. "Model Predictive Control of Grid Forming Converters with Enhanced Power Quality." Applied Sciences 10, no. 18: 6390.

Journal article
Published: 11 September 2020 in IEEE Transactions on Power Electronics
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Capacitors are widely used in dc links of power electronic converters to balance power, suppress voltage ripple, and store short-term energy. Condition monitoring (CM) of dc-link capacitors has great significance in enhancing the reliability of power converter systems. Over the past few years, many efforts have been made to realize CM of dc-link capacitors. This paper gives an overview and a comprehensive comparative evaluation of them with emphasis on the application objectives, implementation methods, and monitoring accuracy when being used. First, the design procedure for the condition monitoring of capacitors is introduced. Second, the main capacitor parameters estimation principles are summarized. According to these principles, various possible CM methods are derived in a step-by-step manner. On this basis, a comprehensive review and comparison of CM schemes for different types of dc-link applications are provided. Finally, application recommendations and future research trends are presented.

ACS Style

Zhaoyang Zhao; Pooya Davari; Wei Guo Lu; Huai Wang; Frede Ge Blaabjerg. An Overview of Condition Monitoring Techniques for Capacitors in DC-Link Applications. IEEE Transactions on Power Electronics 2020, 36, 3692 -3716.

AMA Style

Zhaoyang Zhao, Pooya Davari, Wei Guo Lu, Huai Wang, Frede Ge Blaabjerg. An Overview of Condition Monitoring Techniques for Capacitors in DC-Link Applications. IEEE Transactions on Power Electronics. 2020; 36 (4):3692-3716.

Chicago/Turabian Style

Zhaoyang Zhao; Pooya Davari; Wei Guo Lu; Huai Wang; Frede Ge Blaabjerg. 2020. "An Overview of Condition Monitoring Techniques for Capacitors in DC-Link Applications." IEEE Transactions on Power Electronics 36, no. 4: 3692-3716.

Journal article
Published: 14 August 2020 in IEEE Transactions on Power Electronics
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Capacitors are critical in voltage regulator modules (VRMs) which contribute to store energy and stabilize the output voltage during load transients. Usually, VRMs work with consecutive load transients, which would bring more electro-thermal stress to capacitors and affect the reliability of capacitors compared with the steady-state operation. Recently, some efforts have been made to investigate the reliability of capacitors in power electronic converters. Unfortunately, transient processes are commonly ignored, which can impair the accuracy of the lifetime estimation. Regarding this issue, this paper investigates the influence of transients on the damage of capacitors in VRMs. A 150 W VRM is introduced as a case study. Firstly, the electro-thermal stresses during steady state and transients are analyzed. Then, the lifetime calculation is considered from a single capacitor to hybrid capacitor banks. In addition, a suitable capacitor configuration of capacitor banks is also provided, in order to maximize its lifetime.

ACS Style

Zhaoyang Zhao; Dao Zhou; Pooya Davari; Junlong Fang; Frede Blaabjerg. Reliability Analysis of Capacitors in Voltage Regulator Modules With Consecutive Load Transients. IEEE Transactions on Power Electronics 2020, 36, 2481 -2487.

AMA Style

Zhaoyang Zhao, Dao Zhou, Pooya Davari, Junlong Fang, Frede Blaabjerg. Reliability Analysis of Capacitors in Voltage Regulator Modules With Consecutive Load Transients. IEEE Transactions on Power Electronics. 2020; 36 (3):2481-2487.

Chicago/Turabian Style

Zhaoyang Zhao; Dao Zhou; Pooya Davari; Junlong Fang; Frede Blaabjerg. 2020. "Reliability Analysis of Capacitors in Voltage Regulator Modules With Consecutive Load Transients." IEEE Transactions on Power Electronics 36, no. 3: 2481-2487.

Journal article
Published: 10 August 2020 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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During severe grid faults, grid-following converters may become unstable and experience loss of synchronization when complying with requirements for low-voltage ride-through capability. This phenomenon is well-described, understood, and modeled for single-converter systems but lacks a modeling framework when extended to multi-converter systems. To fill this gap, this work presents the necessary stability conditions and aggregated reduced-order models for different multi-converter configurations, which can be used to assess the transient synchronization stability of grid-following converters under symmetrical grid faults. The necessary conditions for transient stability and the aggregated models are verified through numerous simulation studies, which verify their high accuracy for large-signal synchronization stability assessment. To that end, the Anholt wind power plant is considered as a case study where the aggregated model is compared to the full operation of a wind farm string containing 9 full-order grid-following converter models. High model accuracy is obtained, and the computational burden associated with the proposed model is reduced with a factor of 100 compared to a full-order representation on the tested system. Accordingly, the presented analysis and proposed modeling are attractive as a screening tool and a convenient approach for early-stage fault analysis of a system design.

ACS Style

Mads Graungaard Taul; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. Reduced-Order and Aggregated Modeling of Large-Signal Synchronization Stability for Multiconverter Systems. IEEE Journal of Emerging and Selected Topics in Power Electronics 2020, 9, 3150 -3165.

AMA Style

Mads Graungaard Taul, Xiongfei Wang, Pooya Davari, Frede Blaabjerg. Reduced-Order and Aggregated Modeling of Large-Signal Synchronization Stability for Multiconverter Systems. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2020; 9 (3):3150-3165.

Chicago/Turabian Style

Mads Graungaard Taul; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. 2020. "Reduced-Order and Aggregated Modeling of Large-Signal Synchronization Stability for Multiconverter Systems." IEEE Journal of Emerging and Selected Topics in Power Electronics 9, no. 3: 3150-3165.

Journal article
Published: 06 August 2020 in IEEE Transactions on Power Electronics
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Three-phase dual-active-bridge (3p-DAB) converter is an attractive topology for bidirectional power conversion in high-power applications. However, conduction loss and switching loss are two main loss mechanisms that severely affect its efficiency performance, and adoption of any single modulation scheme or topology cannot minimize these losses over a wide operating range. For this purpose, a reconfigurable topology of 3p-DAB converter is proposed in this paper that utilizes a reconfigurable and tunable resonant network to offer multiple degrees-of-freedom (DoF) in minimizing conduction and switching losses over a wide range of operating conditions. The converter is designed such that for 40 % to 100 % of the rated output power, it operates as a tunable 3p-DAB resonant immittance converter with its output power controlled by varying switching frequency and tuning the resonant frequency of an immittance network to track the switching frequency. Below 40 % of the rated output power, the converter transforms to a tunable 3p-DAB series resonant converter with its output power controlled by varying the impedance of a series resonant network while keeping the switching frequency and phase-shift constant. The combination of both operation modes jointly leads to wide-range zero circulating current and soft-switching of all the switches, and hence a wide-range high-efficiency performance as validated by the experimental results.

ACS Style

Akif Zia Khan; Yiu Pang Chan; Muhammad Yaqoob; Ka-Hong Loo; Pooya Davari; Frede Blaabjerg. A Multistructure Multimode Three-Phase Dual-Active-Bridge Converter Targeting Wide-Range High-Efficiency Performance. IEEE Transactions on Power Electronics 2020, 36, 3078 -3098.

AMA Style

Akif Zia Khan, Yiu Pang Chan, Muhammad Yaqoob, Ka-Hong Loo, Pooya Davari, Frede Blaabjerg. A Multistructure Multimode Three-Phase Dual-Active-Bridge Converter Targeting Wide-Range High-Efficiency Performance. IEEE Transactions on Power Electronics. 2020; 36 (3):3078-3098.

Chicago/Turabian Style

Akif Zia Khan; Yiu Pang Chan; Muhammad Yaqoob; Ka-Hong Loo; Pooya Davari; Frede Blaabjerg. 2020. "A Multistructure Multimode Three-Phase Dual-Active-Bridge Converter Targeting Wide-Range High-Efficiency Performance." IEEE Transactions on Power Electronics 36, no. 3: 3078-3098.

Journal article
Published: 17 June 2020 in IEEE Transactions on Power Electronics
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Generally, power electronic converters are designed to obtain the highest efficiency at rated power while they are most often operated under partial loading conditions. For dual active bridge (DAB) converters, the zero-voltage-switching (ZVS) conditions can be impaired under light load situations. While load depending ZVS operation has been introduced by prior-art approaches, the nonlinear characteristic of the output capacitance in a power device is often not considered and its effect on operating boundaries of ZVS is neglected. In this letter, based on practical switching transients, an improved method of calculating the ZVS range is introduced. By taking into account the non-linearity of output capacitance, the method is developed from a detailed analysis of real switching transients. A 2.5 kW prototype is built, and a comprehensive comparison with priorart approaches is conducted to validate the accuracy of the proposed method

ACS Style

Bochen Liu; Pooya Davari; Frede Blaabjerg. Nonlinear $C_{oss}-V_{DS}$ Profile Based ZVS Range Calculation for Dual Active Bridge Converters. IEEE Transactions on Power Electronics 2020, 36, 45 -50.

AMA Style

Bochen Liu, Pooya Davari, Frede Blaabjerg. Nonlinear $C_{oss}-V_{DS}$ Profile Based ZVS Range Calculation for Dual Active Bridge Converters. IEEE Transactions on Power Electronics. 2020; 36 (1):45-50.

Chicago/Turabian Style

Bochen Liu; Pooya Davari; Frede Blaabjerg. 2020. "Nonlinear $C_{oss}-V_{DS}$ Profile Based ZVS Range Calculation for Dual Active Bridge Converters." IEEE Transactions on Power Electronics 36, no. 1: 45-50.

Review
Published: 12 June 2020 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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The Microgrid concept has been emerged into the power system to provide reliable, renewable and cheaper electricity for the rising global demand. When the microgrids are introduced, there will be several concerns such as active and reactive power sharing, load management, connecting to the main grid, voltage and current deviations, etc. Recently, with the fast deployment of distributed generation, methods to mitigate microgrid harmonics caused by nonlinear loads and power electronic devices have become one of the main focus areas. Consequently, many research works are devoted to this area introducing different harmonic mitigation methods suitable for the microgrids. Hence, the main goal of this paper is to clearly present a comprehensive review of harmonic mitigation methods from hierarchical control view-point. The control strategies proposed to mitigate harmonics are classified into three groups; Primary, secondary, and tertiary. Furthermore, this overview draws a sketch on the global trends in harmonic mitigation methods of an ac microgrid directly applicable to today’s smart grid applications.

ACS Style

Behrooz Adineh; Reza Keypour; Pooya Davari; Frede Blaabjerg. Review of Harmonic Mitigation Methods in Microgrid: From a Hierarchical Control Perspective. IEEE Journal of Emerging and Selected Topics in Power Electronics 2020, 9, 3044 -3060.

AMA Style

Behrooz Adineh, Reza Keypour, Pooya Davari, Frede Blaabjerg. Review of Harmonic Mitigation Methods in Microgrid: From a Hierarchical Control Perspective. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2020; 9 (3):3044-3060.

Chicago/Turabian Style

Behrooz Adineh; Reza Keypour; Pooya Davari; Frede Blaabjerg. 2020. "Review of Harmonic Mitigation Methods in Microgrid: From a Hierarchical Control Perspective." IEEE Journal of Emerging and Selected Topics in Power Electronics 9, no. 3: 3044-3060.

Journal article
Published: 27 April 2020 in IEEE Transactions on Power Electronics
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ACS Style

Bin Guo; Mei Su; Yao Sun; Hui Wang; Bin Liu; Xin Zhang; Josep Pou; Yongheng Yang; Pooya Davari. Optimization Design and Control of Single-Stage Single-Phase PV Inverters for MPPT Improvement. IEEE Transactions on Power Electronics 2020, 35, 13000 -13016.

AMA Style

Bin Guo, Mei Su, Yao Sun, Hui Wang, Bin Liu, Xin Zhang, Josep Pou, Yongheng Yang, Pooya Davari. Optimization Design and Control of Single-Stage Single-Phase PV Inverters for MPPT Improvement. IEEE Transactions on Power Electronics. 2020; 35 (12):13000-13016.

Chicago/Turabian Style

Bin Guo; Mei Su; Yao Sun; Hui Wang; Bin Liu; Xin Zhang; Josep Pou; Yongheng Yang; Pooya Davari. 2020. "Optimization Design and Control of Single-Stage Single-Phase PV Inverters for MPPT Improvement." IEEE Transactions on Power Electronics 35, no. 12: 13000-13016.

Journal article
Published: 03 February 2020 in IEEE Transactions on Power Electronics
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This paper introduces two general ways to derive single-phase bridgeless power factor correction (PFC) topologies and then 15 accessible bridgeless topologies are derived based on the configuration of different basic types of DC-DC converter cells. Although the majority of the topologies have been previously proposed, other possible research points are reviewed. Besides, a consistent component sizing procedure with electric, thermal, and cost models is applied to conduct the performance benchmarking of these PFC topologies in terms of power loss, volume, and cost. Three boost-type PFC topologies are chosen as examples to demonstrate the procedure and the corresponding benchmarking results with both theoretical analyses and experimental verification. Finally, mission profiles of one specific application are introduced to show the material cost payback period of adopting one modified bridgeless boost topology instead of conventional one in different scenarios.

ACS Style

Zhengge Chen; Pooya Davari; Huai Wang. Single-Phase Bridgeless PFC Topology Derivation and Performance Benchmarking. IEEE Transactions on Power Electronics 2020, 35, 9238 -9250.

AMA Style

Zhengge Chen, Pooya Davari, Huai Wang. Single-Phase Bridgeless PFC Topology Derivation and Performance Benchmarking. IEEE Transactions on Power Electronics. 2020; 35 (9):9238-9250.

Chicago/Turabian Style

Zhengge Chen; Pooya Davari; Huai Wang. 2020. "Single-Phase Bridgeless PFC Topology Derivation and Performance Benchmarking." IEEE Transactions on Power Electronics 35, no. 9: 9238-9250.