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Esmaeil Ebrahimzadeh
Rsted AS Wind Power, 521272 Fredericia Denmark 2820

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Journal article
Published: 18 August 2020 in IEEE Transactions on Power Electronics
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With the increased prevalence of power converters in power systems, especially three-phase voltage source converters (VSCs), the stability analysis of power electronics-based power systems has received much attention recently. To this end, different impedance models for three-phase VSCs, such as the dq-domain, sequence-domain, and phasor-domain impedance models among others, have been developed in recent years. A common trend in all these impedance models, which have no noticeable practical advantage compared to each other, is considering a standard synchronous reference frame PLL (SRF-PLL) for the synchronization of the VSC with the power grid. The standard SRF-PLL, however, has a limited filtering ability and, therefore, may not be very practical in most applications. To deal with this shortcoming of the SRF-PLL, a great number of advanced three-phase PLLs have been proposed in the literature. These advanced PLLs may have different feedback/feedforward loops and filters in their structures, which make including their dynamics in the available impedance models complicated. Bridging this gap in research is the objective of this paper. To this end, it is demonstrated that almost all advanced three-phase PLLs have an alternative representation, which can be easily included in the available dq-frame impedance model. Several case studies are presented to verify this idea.

ACS Style

Saeed Golestan; Esmaeil Ebrahimzadeh; Bo Wen; Josep M. Guerrero; Juan C. Vasquez. dq-Frame Impedance Modeling of Three-Phase Grid-Tied Voltage Source Converters Equipped With Advanced PLLs. IEEE Transactions on Power Electronics 2020, 36, 3524 -3539.

AMA Style

Saeed Golestan, Esmaeil Ebrahimzadeh, Bo Wen, Josep M. Guerrero, Juan C. Vasquez. dq-Frame Impedance Modeling of Three-Phase Grid-Tied Voltage Source Converters Equipped With Advanced PLLs. IEEE Transactions on Power Electronics. 2020; 36 (3):3524-3539.

Chicago/Turabian Style

Saeed Golestan; Esmaeil Ebrahimzadeh; Bo Wen; Josep M. Guerrero; Juan C. Vasquez. 2020. "dq-Frame Impedance Modeling of Three-Phase Grid-Tied Voltage Source Converters Equipped With Advanced PLLs." IEEE Transactions on Power Electronics 36, no. 3: 3524-3539.

Journal article
Published: 03 May 2020 in Applied Sciences
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By the increase of the penetration of power-electronic-based (PE-based) units, such as wind turbines and PV systems, many features of those power systems, such as stability, security, and protection, have been changed. In this paper, the security of electrical grids with high wind turbines penetration is discussed. To do so, first, an overview of the power systems’ security assessment is presented. Based on that, stability and security challenges introduced by increasing the penetration of wind turbines in power systems are studied, and a new guideline for the security assessment of the PE-based power systems is proposed. Simulation results for the IEEE 39-bus test system show that the proposed security guideline is necessary for PE-based power systems, as the conventional security assessments may not be able to indicate its security status properly.

ACS Style

Bahram Shakerighadi; Saeed Peyghami; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Back. A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines. Applied Sciences 2020, 10, 3190 .

AMA Style

Bahram Shakerighadi, Saeed Peyghami, Esmaeil Ebrahimzadeh, Frede Blaabjerg, Claus Leth Back. A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines. Applied Sciences. 2020; 10 (9):3190.

Chicago/Turabian Style

Bahram Shakerighadi; Saeed Peyghami; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Back. 2020. "A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines." Applied Sciences 10, no. 9: 3190.

Journal article
Published: 07 February 2020 in IEEE Access
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ACS Style

Bahram Shakerighadi; Esmaeil Ebrahimzadeh; Mads Graungaard Taul; Frede Blaabjerg; Claus Leth Bak. Modeling and Adaptive Design of the SRF-PLL: Nonlinear Time-Varying Framework. IEEE Access 2020, 8, 28635 -28645.

AMA Style

Bahram Shakerighadi, Esmaeil Ebrahimzadeh, Mads Graungaard Taul, Frede Blaabjerg, Claus Leth Bak. Modeling and Adaptive Design of the SRF-PLL: Nonlinear Time-Varying Framework. IEEE Access. 2020; 8 ():28635-28645.

Chicago/Turabian Style

Bahram Shakerighadi; Esmaeil Ebrahimzadeh; Mads Graungaard Taul; Frede Blaabjerg; Claus Leth Bak. 2020. "Modeling and Adaptive Design of the SRF-PLL: Nonlinear Time-Varying Framework." IEEE Access 8, no. : 28635-28645.

Journal article
Published: 11 December 2018 in IEEE Transactions on Industry Applications
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ACS Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak. Optimum Design of Power Converter Current Controllers in Large-Scale Power Electronics Based Power Systems. IEEE Transactions on Industry Applications 2018, 55, 2792 -2799.

AMA Style

Esmaeil Ebrahimzadeh, Frede Blaabjerg, Xiongfei Wang, Claus Leth Bak. Optimum Design of Power Converter Current Controllers in Large-Scale Power Electronics Based Power Systems. IEEE Transactions on Industry Applications. 2018; 55 (3):2792-2799.

Chicago/Turabian Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak. 2018. "Optimum Design of Power Converter Current Controllers in Large-Scale Power Electronics Based Power Systems." IEEE Transactions on Industry Applications 55, no. 3: 2792-2799.

Journal article
Published: 09 November 2018 in IEEE Access
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By the proliferation of Electric Vehicles (EVs) in power systems, it is needed to manage their demand energy within a regulated market framework. From the market perspective, integration of different market players, such as the energy producers, aggregators, and loads, could complicate the system operation and management. Therefore, an appropriate model of the market, which shows the exact behavior of the system components is needed. In this paper, a new tri-level game theoretical-approach for energy management of EVs and Electric Vehicle Charging Stations (EVCSs) as independent decision makers for their energy scenarios, is proposed. To make it practical for a real power system, the system operator is also included in the proposed method as a master decision maker. Therefore, EVs’ and EVCSs’ objectives are to maximize their financial profits, while the system operator indirectly controls their energy scenarios in order to fulfill the system’s technical constraints. To do so, at the highest level of the proposed method, technical goals of the system, which are related to the system operational condition, will be followed as the objective criteria. At the second level of the designed model, the EVCSs financial objectives are optimized. In the third level of the proposed method, it is tried to minimize the EVs’ cost function. The method is tested on an IEEE 9-bus standard system, and the results show superior performance of the proposed energy management system (EMS) compared to the conventional EMS methods in terms of technical and financial objectives. In this way, it is shown that in the case of considering only one aspect of the system, either financial or technical, the other aspects of the system may not be satisfied. Hence, it is essential to consider both the financial and technical aspects of the system simultaneously, in order to operate the system optimally and securely.

ACS Style

Bahram Shakerighadi; Amjad Anvari-Moghaddam; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Bak. A Hierarchical Game Theoretical Approach for Energy Management of Electric Vehicles and Charging Stations in Smart Grids. IEEE Access 2018, 6, 67223 -67234.

AMA Style

Bahram Shakerighadi, Amjad Anvari-Moghaddam, Esmaeil Ebrahimzadeh, Frede Blaabjerg, Claus Leth Bak. A Hierarchical Game Theoretical Approach for Energy Management of Electric Vehicles and Charging Stations in Smart Grids. IEEE Access. 2018; 6 (99):67223-67234.

Chicago/Turabian Style

Bahram Shakerighadi; Amjad Anvari-Moghaddam; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Bak. 2018. "A Hierarchical Game Theoretical Approach for Energy Management of Electric Vehicles and Charging Stations in Smart Grids." IEEE Access 6, no. 99: 67223-67234.

Conference paper
Published: 01 November 2018 in 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC)
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Grid-connected Voltage Source Converters (VSCs) are widely used in Power Electronic-based (PE-based) power systems. Therefore, it is necessary to have stability analysis tools for different system conditions. In this paper, Lyapunov- and eigenvalue-based methods are used in order to analyze the stability of the grid-connected VSC. This Lyapunov-based technique is valid for large-signal stability analysis, when the system is subjected to a large disturbance. Eigenvalue-based methods are simpler but these are not valid under large disturbance conditions. The Lyapunov-based analysis can systematically model the linear and non-linear behavior of the grid-connected VSCs.

ACS Style

Bahram Shakerighadi; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Bak. Lyapunov- and Eigenvalue-based Stability Assessment of the Grid-connected Voltage Source Converter. 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) 2018, 1 -6.

AMA Style

Bahram Shakerighadi, Esmaeil Ebrahimzadeh, Frede Blaabjerg, Claus Leth Bak. Lyapunov- and Eigenvalue-based Stability Assessment of the Grid-connected Voltage Source Converter. 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC). 2018; ():1-6.

Chicago/Turabian Style

Bahram Shakerighadi; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Bak. 2018. "Lyapunov- and Eigenvalue-based Stability Assessment of the Grid-connected Voltage Source Converter." 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) , no. : 1-6.

Journal article
Published: 09 October 2018 in ISA Transactions
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Recently, LCL filters have been widely used in the output of single phase inverters. Since, the grid side inductor in these filters is in series with the grid impedance at the Point of Common Coupling (PCC), it may create new resonances. This phenomena may take the control loop toward instability. In this case, in order to have a reliable operation, the current controller should be insensitive to the grid impedance variation. In order to damp these resonances, researchers have presented some methods using active or passive damping. These methods added an extra loop to the control loop, an extra passive component in the filter or extra sensor in the control process. But in most of them, the complexity and the cost of controller have been increased. Therefore, presenting a simple control method without extra sensor, passive component or extra arrangement can be a promising approach. This paper presents an MPC-based current controller, which is simple and robust against the grid impedance variation and even the variation of the LCL filter parameters. In contrast to classical multi-loop controller like Proportional-Resonant (PR) controllers, the proposed control method does not need any parameter tuning. In the proposed controller, the switching plan and duty cycles are determined by a cost function and a switching table. Therefore, at the same time with any variation in grid impedance, the proposed controller changes the next switching state and duty cycle. Operating performance like look-up table, searching in all possible switching states to find the best state for the next switching period, makes the controller adaptive and robust against the variation of LCL filter parameters. In order to confirm the effectiveness of the proposed controller, simulations and experimental results of the proposed controller are compared with a classical PR controller.

ACS Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Esmaeil Ebrahimzade. Robust MPC-based current controller against grid impedance variations for single-phase grid-connected inverters. ISA Transactions 2018, 84, 154 -163.

AMA Style

Esmaeil Zangeneh Bighash, Seyed Mohammad Sadeghzadeh, Esmaeil Ebrahimzadeh, Frede Blaabjerg, Esmaeil Ebrahimzade. Robust MPC-based current controller against grid impedance variations for single-phase grid-connected inverters. ISA Transactions. 2018; 84 ():154-163.

Chicago/Turabian Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Esmaeil Ebrahimzade. 2018. "Robust MPC-based current controller against grid impedance variations for single-phase grid-connected inverters." ISA Transactions 84, no. : 154-163.

Journal article
Published: 22 September 2018 in Energies
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In this paper, a Lyapunov-based method is used in order to determine the stability boundaries of the grid-connected voltage source converter (VSC). To do so, a state space model of the VSC is used to form the Lyapunov function of the system. Then, by using the eigenvalues of the Lyapunov function, the system stability boundaries will be determined. It is shown that the grid-connected VSC works in its stable mode when all of its Lyapunov function’s eigenvalues are positive. The proposed model validity is tested by time-domain simulation. Simulation results show that the method is credible in determining the stability margin of the grid-connected VSC.

ACS Style

Bahram Shakerighadi; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Bak. Large-Signal Stability Modeling for the Grid-Connected VSC Based on the Lyapunov Method. Energies 2018, 11, 2533 .

AMA Style

Bahram Shakerighadi, Esmaeil Ebrahimzadeh, Frede Blaabjerg, Claus Leth Bak. Large-Signal Stability Modeling for the Grid-Connected VSC Based on the Lyapunov Method. Energies. 2018; 11 (10):2533.

Chicago/Turabian Style

Bahram Shakerighadi; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Bak. 2018. "Large-Signal Stability Modeling for the Grid-Connected VSC Based on the Lyapunov Method." Energies 11, no. 10: 2533.

Journal article
Published: 01 June 2018 in International Journal of Electrical Power & Energy Systems
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ACS Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. Improving performance of LVRT capability in single-phase grid-tied PV inverters by a model-predictive controller. International Journal of Electrical Power & Energy Systems 2018, 98, 176 -188.

AMA Style

Esmaeil Zangeneh Bighash, Seyed Mohammad Sadeghzadeh, Esmaeil Ebrahimzadeh, Frede Blaabjerg. Improving performance of LVRT capability in single-phase grid-tied PV inverters by a model-predictive controller. International Journal of Electrical Power & Energy Systems. 2018; 98 ():176-188.

Chicago/Turabian Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. 2018. "Improving performance of LVRT capability in single-phase grid-tied PV inverters by a model-predictive controller." International Journal of Electrical Power & Energy Systems 98, no. : 176-188.

Research article
Published: 14 May 2018 in IET Renewable Power Generation
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This study proposes a combined control method based on vector control (VC) and virtual flux direct power control (VFDPC) for grid-side converter of doubly fed induction generator (DFIG)-based wind energy conversion systems (WECSs). VC gives lower power ripple with a slower dynamic response, while VFDPC provides a faster dynamic response, but higher power ripple. So, an analogy between VC and VFDPC is proved first and then used to propose a combined control method that takes the advantages of VC and VFDPC in an integrated control system. In the combined control method, the grid currents are directly controlled using hysteresis controllers and optimal switching table. It has several advantages compared to VC including faster power/current dynamic response, robustness to grid filter parameter variation, lower computation, and simple implementation. On the other hand, its advantages compared to VFDPC include less current harmonic distortion, lower power ripple, and robustness to measurement noise. To demonstrate the effectiveness and robustness of the combined control method, simulation results on a 1.5 MW DFIG-based WECS are provided and compared with both VC and VFDPC under different steady-state and transient conditions. The simulation results verify the superiority of the proposed method over either VC or VFDPC.

ACS Style

Jafar Mohammadi; Sadegh Vaez‐Zadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. Combined control method for grid‐side converter of doubly fed induction generator‐based wind energy conversion systems. IET Renewable Power Generation 2018, 12, 943 -952.

AMA Style

Jafar Mohammadi, Sadegh Vaez‐Zadeh, Esmaeil Ebrahimzadeh, Frede Blaabjerg. Combined control method for grid‐side converter of doubly fed induction generator‐based wind energy conversion systems. IET Renewable Power Generation. 2018; 12 (8):943-952.

Chicago/Turabian Style

Jafar Mohammadi; Sadegh Vaez‐Zadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. 2018. "Combined control method for grid‐side converter of doubly fed induction generator‐based wind energy conversion systems." IET Renewable Power Generation 12, no. 8: 943-952.

Journal article
Published: 01 May 2018 in Electric Power Systems Research
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Single phase grid-connected inverters with LCL filter are widely used to connect the photovoltaic systems to the utility grid. Among the presented control schemes, predictive control methods are faster and more accurate but are more complex to implement. Recently, the model-predictive control algorithm for single-phase inverter has been presented, where the algorithm implementation is straightforward. In the proposed approach, all switching states are tested in each switching period to achieve the control objectives. However, since the number of the switching states in single-phase inverter is low, the inverter output current has a high total harmonic distortions. In order to reduce the total harmonic distortions of the injected current, this paper presents a high-quality model-predictive control for one of the newest structure of the grid connected photovoltaic inverter, i.e., HERIC inverter with LCL filter. In the proposed approach, the switching algorithm is changed and the number of the switching states is increased by some virtual vectors. Simulation results show that the proposed approach lead to a lower total harmonic distortions in the injected current along with a fast dynamic response. The proposed predictive control has been simulated and implemented in a 1 kW single-phase HERIC inverter with LCL filter at the output.

ACS Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. High quality model predictive control for single phase grid-connected photovoltaic inverters. Electric Power Systems Research 2018, 158, 115 -125.

AMA Style

Esmaeil Zangeneh Bighash, Seyed Mohammad Sadeghzadeh, Esmaeil Ebrahimzadeh, Frede Blaabjerg. High quality model predictive control for single phase grid-connected photovoltaic inverters. Electric Power Systems Research. 2018; 158 ():115-125.

Chicago/Turabian Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. 2018. "High quality model predictive control for single phase grid-connected photovoltaic inverters." Electric Power Systems Research 158, no. : 115-125.

Journal article
Published: 09 March 2018 in IEEE Transactions on Power Electronics
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Compared with the conventional power systems, large-scale power electronics based power systems present a more complex situation, where harmonic instability may be induced by the mutual interactions between the inner control loops of the converters. This paper presents an approach to locate which power converters and buses are more sensitive and have significant contribution to the harmonic instability. In the approach, a power electronics based system is introduced as a Multi-Input Multi-Output (MIMO) dynamic system by means of a dynamic admittance matrix. Bus Participation Factors (PFs) are calculated by the oscillatory mode sensitivity analysis versus the elements of the MIMO transfer function matrix. The PF analysis detects which power electronic converters or buses have a higher participation in harmonic instability excitation than others or at which buses such instability problems have a higher impact. In order to confirm the effectiveness of the presented approach, time-domain simulation results are provided for a 400-MW wind farm in PSCAD software environment.

ACS Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak. Bus Participation Factor Analysis for Harmonic Instability in Power Electronics Based Power Systems. IEEE Transactions on Power Electronics 2018, 33, 10341 -10351.

AMA Style

Esmaeil Ebrahimzadeh, Frede Blaabjerg, Xiongfei Wang, Claus Leth Bak. Bus Participation Factor Analysis for Harmonic Instability in Power Electronics Based Power Systems. IEEE Transactions on Power Electronics. 2018; 33 (12):10341-10351.

Chicago/Turabian Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak. 2018. "Bus Participation Factor Analysis for Harmonic Instability in Power Electronics Based Power Systems." IEEE Transactions on Power Electronics 33, no. 12: 10341-10351.

Conference paper
Published: 01 March 2018 in 2018 IEEE Applied Power Electronics Conference and Exposition (APEC)
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The High Frequency Resonance (HFR) of the Doubly Fed Induction Generator (DFIG)-based wind farm is possible to occur when the wind farm is connected to the long-distance transmission cable. The cable resistance may always be in variation due to temperature and humidity changing, insulation condition variation and etc. In this paper, it is found out that the amplitude of the HFR is influenced by the cable resistance, thus it is interesting to investigate the HFR performance under various cable resistance. The impedance modeling of the DFIG-based wind farm and the long-distance transmission cable are established first, then the HFR will be analyzed under the variation of the transmission cable resistance using the Nyquist based method. Time domain simulation results based on MATLAB/Simulink are provided to validate the analysis.

ACS Style

Yipeng Song; Esmaeil Ebrahimzadeh; Frede Blaabjerg. Sensitivity analysis of the wind farm high frequency resonance under transmission cable resistance variation. 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) 2018, 3218 -3224.

AMA Style

Yipeng Song, Esmaeil Ebrahimzadeh, Frede Blaabjerg. Sensitivity analysis of the wind farm high frequency resonance under transmission cable resistance variation. 2018 IEEE Applied Power Electronics Conference and Exposition (APEC). 2018; ():3218-3224.

Chicago/Turabian Style

Yipeng Song; Esmaeil Ebrahimzadeh; Frede Blaabjerg. 2018. "Sensitivity analysis of the wind farm high frequency resonance under transmission cable resistance variation." 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) , no. : 3218-3224.

Journal article
Published: 16 January 2018 in IEEE Transactions on Energy Conversion
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During the past two decades, the doubly fed induction generator (DFIG) based wind farm has been under rapid growth, and the increasing wind power penetration has been seen. Practically, these wind farms are connected to the three-phase ac grid through long transmission cable which can be modeled as several Π units. The impedance of this cable cannot be neglected and requires careful investigation due to its long distance. As a result, the impedance interaction between the DFIG-based wind farm and the long cable is inevitable, and may produce high-frequency resonance (HFR) in the wind farm. This paper discusses the HFR of the large-scale DFIG-based wind farm connected to the long cable. Several influencing factors, including 1) the length of the cable, 2) the output active power, and 3) the rotor speed, are investigated. The transformer leakage inductances in the transmission system are taken into consideration when investigating the HFR. Simulation validations using MATLAB/Simulink have been conducted to verify the theoretical analysis.

ACS Style

Yipeng Song; Esmaeil Ebrahimzadeh; Frede Blaabjerg. Analysis of High-Frequency Resonance in DFIG-Based Offshore Wind Farm via Long Transmission Cable. IEEE Transactions on Energy Conversion 2018, 33, 1036 -1046.

AMA Style

Yipeng Song, Esmaeil Ebrahimzadeh, Frede Blaabjerg. Analysis of High-Frequency Resonance in DFIG-Based Offshore Wind Farm via Long Transmission Cable. IEEE Transactions on Energy Conversion. 2018; 33 (3):1036-1046.

Chicago/Turabian Style

Yipeng Song; Esmaeil Ebrahimzadeh; Frede Blaabjerg. 2018. "Analysis of High-Frequency Resonance in DFIG-Based Offshore Wind Farm via Long Transmission Cable." IEEE Transactions on Energy Conversion 33, no. 3: 1036-1046.

Journal article
Published: 11 January 2018 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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The single-phase nonlinear loads are going to increase in the future and power quality concerns in the residential distribution grid. Since most of nonlinear loads have a dispersed nature, compensating these phenomena may be complicated. On the other hand, the increased capacity of single-phase grid-connected roof-top PV inverters in residential distribution grid can be an opportunity to engage these systems in the power quality issues as custom power devices. By implementing a proper control for roof-top PV inverters, these systems may in addition to inject the fundamental current, additionally act like a virtual harmonic resistance, and dedicate their additional current capacity to compensate the harmonics of residential distribution grid. In this paper, each roof-top PV system is a grid-harmonic supervisor, where it continually measures the PCC voltage harmonics by the sliding discrete Fourier transform algorithm and then individually compensates the measured harmonics by the proposed adaptive-harmonic compensator. In the proposed approach, a current reference is separately determined for compensating each harmonic component. Then, a specific amount of additional current capacity will be dedicated for each component to compensate by using adaptive gain. Finally, the current reference is controlled by a model predictive current controller. It has been tested in a single-phase transformerless inverter (highly efficient and reliable inverter concept) with an LCL filter at the output. Also, the effectiveness of the control scheme has been verified by MATLAB Simulink and experimental tests.

ACS Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. Adaptive-Harmonic Compensation in Residential Distribution Grid by Roof-Top PV Systems. IEEE Journal of Emerging and Selected Topics in Power Electronics 2018, 6, 2098 -2108.

AMA Style

Esmaeil Zangeneh Bighash, Seyed Mohammad Sadeghzadeh, Esmaeil Ebrahimzadeh, Frede Blaabjerg. Adaptive-Harmonic Compensation in Residential Distribution Grid by Roof-Top PV Systems. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2018; 6 (4):2098-2108.

Chicago/Turabian Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. 2018. "Adaptive-Harmonic Compensation in Residential Distribution Grid by Roof-Top PV Systems." IEEE Journal of Emerging and Selected Topics in Power Electronics 6, no. 4: 2098-2108.

Journal article
Published: 23 October 2017 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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Unlike conventional power systems where harmonic resonances are coming from passive inductive and capacitive elements, large-scale power electronic systems like wind farms present a more complex system, where the fast dynamics of the power electronic converters may present an inductive or capacitive behavior. Therefore, the interactions between the fast controllers of the power converters and the passive elements may lead to harmonic instability and new resonances at various frequencies. This paper presents an optimum design technique for the Wind Turbine (WT) inner controllers in a PMSG based wind farm in order to reduce the number of resonances and to mitigate harmonic instability. In the approach, a PMSG based wind farm is modeled as a Multi-Input Multi-Output (MIMO) dynamic system by modeling the high bandwidth control loops of the power converters. Resonance frequencies and oscillatory modes of the wind farm are identified based on the MIMO matrix. Afterwards, a multi-objective optimization procedure based on Genetic Algorithm (GA) is proposed to put the oscillatory modes of the wind farm in suitable locations in order to minimize the number of the resonances and to guarantee a stable operation of the wind farm. A 400-MW wind farm is studied in the PSCAD/EMTDC software environment to confirm the validity of the proposed optimum design technique.

ACS Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak. Reducing Harmonic Instability and Resonance Problems in PMSG-Based Wind Farms. IEEE Journal of Emerging and Selected Topics in Power Electronics 2017, 6, 73 -83.

AMA Style

Esmaeil Ebrahimzadeh, Frede Blaabjerg, Xiongfei Wang, Claus Leth Bak. Reducing Harmonic Instability and Resonance Problems in PMSG-Based Wind Farms. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2017; 6 (1):73-83.

Chicago/Turabian Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak. 2017. "Reducing Harmonic Instability and Resonance Problems in PMSG-Based Wind Farms." IEEE Journal of Emerging and Selected Topics in Power Electronics 6, no. 1: 73-83.

Conference paper
Published: 01 October 2017 in IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society
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In this paper, an eigenvalue-based harmonic stability analysis method for offshore wind farm is proposed. Considering the internal cable connection layout, a component connection method (CCM) is adopted to divide the system into individual blocks as current controller of converters, LCL filters, collection system cable impedance, transmission cable impedance and grid impedance. By using this method, each block can be modelled independently and then be integrated into a whole state space matrix which contains sparse and diagonal matrix. Compared with the traditional state space formulation process, this method is superior in reducing the computational cost. A 4 by 4 wind turbines wind farm is selected as the study case and the proposed method is validated by comparing the results obtained from time domain simulation software - Power System Computer Aided Design (PSCAD).

ACS Style

Peng Hou; Esmaeil Ebrahimzadeh; Xiongfei Wang; Frede Blaabjerg; Jiakun Fang; Yanbo Wang. Harmonic stability analysis of offshore wind farm with component connection method. IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society 2017, 4926 -4932.

AMA Style

Peng Hou, Esmaeil Ebrahimzadeh, Xiongfei Wang, Frede Blaabjerg, Jiakun Fang, Yanbo Wang. Harmonic stability analysis of offshore wind farm with component connection method. IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. 2017; ():4926-4932.

Chicago/Turabian Style

Peng Hou; Esmaeil Ebrahimzadeh; Xiongfei Wang; Frede Blaabjerg; Jiakun Fang; Yanbo Wang. 2017. "Harmonic stability analysis of offshore wind farm with component connection method." IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society , no. : 4926-4932.

Conference paper
Published: 01 October 2017 in IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society
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Nowadays capacity of the photovoltaic systems in the grid is remarkable and provides a major part of energy in the grid. Therefore, an abruption of these systems from the grid can create a damage to the grid. Unlike in the past that PV systems disconnected from the grid when a voltage drop occurred, nowadays these systems should have Low Voltage Ride-Through (LVRT) capability. The PV system should stay connected to the grid at fault time and help to recover the grid voltage by injecting the reactive power like in a power plant or a custom power device. There are two important factors for single phase grid connected PV inverters. The first one is the structure of the inverter and the second one is the control part. In this regard, the HERIC inverter can be a good selection among the transformerless inverters for a PV system due to its high efficiency. For the control part, this paper presents a look-up table based Model Predictive Control (MPC) that is simple, fast and has soft behavior in tracking of the reference during LVRT. The proposed control method has been implemented in a 1 kW single-phase transformerless HERIC (Highly Efficient and Reliable Inverter Concept) inverter using an LCL filter.

ACS Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. LVRT capability of single-phase grid-connected HERIC inverter in PV systems by a look-up table based predictive control. IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society 2017, 2570 -2575.

AMA Style

Esmaeil Zangeneh Bighash, Seyed Mohammad Sadeghzadeh, Esmaeil Ebrahimzadeh, Frede Blaabjerg. LVRT capability of single-phase grid-connected HERIC inverter in PV systems by a look-up table based predictive control. IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. 2017; ():2570-2575.

Chicago/Turabian Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Frede Blaabjerg. 2017. "LVRT capability of single-phase grid-connected HERIC inverter in PV systems by a look-up table based predictive control." IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society , no. : 2570-2575.

Proceedings article
Published: 01 October 2017 in 2017 IEEE Energy Conversion Congress and Exposition (ECCE)
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Single-phase grid-connected inverters with LCL filter are widely used to connect photovoltaic systems to the utility grid. Among the existing control schemes, predictive control methods are faster and more accurate but also more complicated to implement. Recently, the Model Predictive Control (MPC) algorithm for single-phase inverter has been presented, where the algorithm implementation is straightforward. In the MPC approach, all switching states are considered in each switching period to achieve the control objectives. However, since the number of switching states in single-phase inverters is small, the inverter output current has a high Total Harmonic Distortions (THD). In order to reduce this, this paper presents an improved MPC for single-phase grid-connected inverters. In the proposed approach, the switching algorithm is changed and the number of the switching states is increased by means of virtual vectors. Simulation results show that the proposed approach lead to a lower THD in the injected current combined with fast dynamics. The proposed predictive control has been simulated and implemented on a 1 kW single-phase HERIC (highly efficient and reliable inverter concept) inverter with an LCL filter at the output.

ACS Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Yongheng Yang; Frede Blaabjerg. A novel model predictive control for single-phase grid-connected photovoltaic inverters. 2017 IEEE Energy Conversion Congress and Exposition (ECCE) 2017, 461 -467.

AMA Style

Esmaeil Zangeneh Bighash, Seyed Mohammad Sadeghzadeh, Esmaeil Ebrahimzadeh, Yongheng Yang, Frede Blaabjerg. A novel model predictive control for single-phase grid-connected photovoltaic inverters. 2017 IEEE Energy Conversion Congress and Exposition (ECCE). 2017; ():461-467.

Chicago/Turabian Style

Esmaeil Zangeneh Bighash; Seyed Mohammad Sadeghzadeh; Esmaeil Ebrahimzadeh; Yongheng Yang; Frede Blaabjerg. 2017. "A novel model predictive control for single-phase grid-connected photovoltaic inverters." 2017 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 461-467.

Conference paper
Published: 01 October 2017 in 2017 IEEE Energy Conversion Congress and Exposition (ECCE)
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In large power electronic systems like a wind farm, the mutual interactions between the control systems of the power converters can lead to various stability and power quality problems. In order to predict the system dynamic behavior, this paper presents an approach to model a wind farm as a Multi-Input Multi-Output (MIMO) dynamic system, where the current control loops with Phase-Locked Loops (PLLs) are linearized around an operating point. Each sub-module of the wind farm is modeled as a 2×2 admittance matrix in dq-domain and all are combined together by using a dq nodal admittance matrix. The frequency and damping of the oscillatory modes are calculated by finding the poles of the introduced MIMO matrix. Time-domain simulation results obtained from a 400-MW wind farm are used to verify the effectiveness of the presented model.

ACS Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak; Torsten Lund; Gert K. Andersen; Carlos Gomez Suarez; Jens-Jacob Berg. Small signal modeling of wind farms. 2017 IEEE Energy Conversion Congress and Exposition (ECCE) 2017, 3710 -3716.

AMA Style

Esmaeil Ebrahimzadeh, Frede Blaabjerg, Xiongfei Wang, Claus Leth Bak, Torsten Lund, Gert K. Andersen, Carlos Gomez Suarez, Jens-Jacob Berg. Small signal modeling of wind farms. 2017 IEEE Energy Conversion Congress and Exposition (ECCE). 2017; ():3710-3716.

Chicago/Turabian Style

Esmaeil Ebrahimzadeh; Frede Blaabjerg; Xiongfei Wang; Claus Leth Bak; Torsten Lund; Gert K. Andersen; Carlos Gomez Suarez; Jens-Jacob Berg. 2017. "Small signal modeling of wind farms." 2017 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 3710-3716.