An Active Common-Mode Voltage Canceler for PWM Converters in Wind-Turbine Doubly-Fed Induction Generators

Zalhaf, Amr S.; Abdelsalam, Mohamed; Ahmed, Mahmoud

doi:10.3390/en12040691

Cited by 9 publications

(2 citation statements)

References 16 publications

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“…The leakage current can be suppressed by reducing the amplitude and frequency of the CMV or breaking the PV array from the grid on the DC side of the inverter system. In recent years, many approaches have been made to overcome the CMV and leakage current in transformerless PV inverters [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The SVM control method is generally implemented to control the traditional threephase two-level H6 VSI.…”

Section: Introductionmentioning

confidence: 99%

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

et al. 2022

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In grid-connected photovoltaic (PV) systems, a transformer is needed to achieve the galvanic isolation and voltage ratio transformations. Nevertheless, these traditional configurations of transformers increase the weight, size, and cost of the inverter while decreasing the efficiency and power density. The transformerless topologies have become a good solution. However, the problem is that commode-mode voltage and leakage current can occur via the stray capacitors between the PV array and the ground of the inverter. Various transformerless inverters have been introduced with different techniques, such as reducing the common-mode voltage or eliminating the leakage current. Furthermore, to introduce the development of transformerless PV inverters, especially in three-phase two-level inverter systems, this paper provides a comprehensive review of various common-mode voltage reduction three-phase two-level inverters.

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Section: Introductionmentioning

confidence: 99%

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

et al. 2022

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“…as well as installing EMI filters [13]- [17]. A passive EMI filter which utilizes RLC networks to damping out the highfrequency leakage current because of the grounded motor frame and the grounded heat sink was discussed in [13].…”

Section: Introductionmentioning

confidence: 99%

A Switched-Capacitor-Voltage-Doubler Based Boost Inverter for Common-Mode Voltage Reduction

et al. 2019

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In this paper, a modified three-phase two-level voltage source inverter is proposed. By combining the conventional three-phase H-bridge inverter with a switched-capacitor-voltage-doubler network, the DC-link voltage of the proposed inverter is double with respect to the input DC voltage. As a result, the output voltage of the proposed inverter can be higher than the input DC voltage. Furthermore, a commonmode voltage (CMV) of the proposed inverter can be reduced through controlling the two additional switches based on the space vector pulse-width modulation. Compared to the existing modulations and topologies, the variation in CMV can only be up to 16.6% of DC-link voltage. Furthermore, the voltage stress across additional switches and diodes is equal to half of DC-link voltage. Mathematical analysis, operating principles, and comparison of the proposed three-phase two-level voltage source inverter with the conventional three-phase voltage source inverters are presented. The simulation results based on PLECS software verify a good performance of the proposed inverter. Finally, a laboratory prototype based on a TMS320F280049 DSP is developed and experimental tests are carried out to validate the effectiveness of the proposed three-phase inverter topology. INDEX TERMS Three-phase inverter topology, common-mode voltage, transformerless PV system, spacevector pulse-width modulation, leakage current.

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A novel impedance modeling and stability analysis paradigm of microgrids consisting of virtual synchronous generators and constant power loads

Ge,

Han,

Zhou

et al. 2024

Circuit Theory & Apps

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The application of virtual synchronous generators (VSGs) in power systems is gradually increasing to address the low inertia issue caused by the high penetration of renewable energy sources. Besides, the stability of microgrids (MGs) is threatened by constant power loads (CPLs) consisting of power electronic converters with closed‐loop controllers. To investigate the stability of the MG composed of VSG and CPL, this paper analyzes the operational principles of VSG and CPL, revealing that only the bipolar switch logic function is suitable for establishing a closed‐loop model if the output of the inner‐loop controller is considered as the duty cycle of the PWM signal. Furthermore, the closed‐loop impedance models of VSG and CPL were established in the dq frame. Impedance‐based analysis results show that the MG is prone to oscillation in the mid‐band. Therefore, the active power loop parameters of the VSG have a small impact on the stability of the MG, while the LC filter and inner loop controllers have a greater impact on the stability. Based on the oscillation mechanism and passivity theory, the impedance reshaping strategy for VSG and CPL is proposed. It is verified that the proposed control strategy can significantly improve the stability of the MG through the comparison of simulation results and theoretical analysis.

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An Active Common-Mode Voltage Canceler for PWM Converters in Wind-Turbine Doubly-Fed Induction Generators

Cited by 9 publications

References 16 publications

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

A Switched-Capacitor-Voltage-Doubler Based Boost Inverter for Common-Mode Voltage Reduction

A novel impedance modeling and stability analysis paradigm of microgrids consisting of virtual synchronous generators and constant power loads

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