Multi-converter harmonic voltage compensation control strategy under nonlinear loads
DOI：10.7667/PSPC180477
Key Words:multi-converter  harmonic voltage compensation  virtual synchronous generator  cascaded generalized integrator  virtual impedance  harmonic suppression
Author NameAffiliationE-mail
XU Liu School of Electrical Engineering, Guangxi University, Nanning 530004, China  
LÜ Zhilin School of Electrical Engineering, Guangxi University, Nanning 530004, China luzhilin2001@163.com 
MENG Zechen School of Electrical Engineering, Guangxi University, Nanning 530004, China  
WEI Qing School of Electrical Engineering, Guangxi University, Nanning 530004, China  
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Abstract:A multi-converter will cause voltage distortion when it is connected to nonlinear load. In order to solve this problem, a comprehensive control strategy of harmonic voltage compensation is proposed. First, a virtual synchronous generator control strategy is used to simulate the external characteristics of the synchronous generator, which makes the inverter have inertial and damping characteristics. Secondly, the cascaded generalized integrator is used to build harmonic separate network to extract the corresponding fundamental and harmonic current components. And then the inductive virtual impedance used at fundamental wave is combined to improve the average power, and the resistive and capacitive variable virtual impedance used at harmonics wave is employed to change the output impedance of the system to compensate for the harmonic voltage. Then, multi-resonant voltage controller is used to suppress the harmonics of the output voltage based on a virtual synchronous generator. Finally, the simulation of the proposed comprehensive control strategy is carried out. The results verify the correctness of the proposed strategy in harmonic voltage compensation under multi-converter. This work is supported by National Natural Science Foundation of China (No. 61364027).
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