基于SOGI的MMC环流抑制策略研究

doi:10.16180/j.cnki.issn1007-7820.2023.07.003

Abstract

Abstract:

MMC is widely used in high-voltage DC transmission applications due to its highly symmetrical sub-module cascade structure and good output waveform quality. The presence of MMC circulating current will aggravate the bridge arm loss, distort the bridge arm current and generate high harmonic components, which will seriously damage the power quality. In view of this problem, this study adopts the method of extracting the AC component of the circulating current by a multi-harmonic filter based on the interplay of SOGI and DC integrator and suppressing the circulating current by a new circulating current suppressor composed of three quasi-PR controllers connected in parallel. An 11-level MMC inverter simulation model is established on MATLAB/Simulink platform, and the simulation results show that the proposed control strategy can effectively complete the control of the system. Compared with the traditional circulating current suppression method, the circulating current suppression effect of the proposed method is more obvious, and the capacitor voltage fluctuation range is reduced by about 60%, which verifies the correctness and effectiveness of the proposed control circulating current control strategy.

Key words: modular multi-level converter, SOGI, quasi PR controller, pressure equalization control, circulating current suppression, carrier phase shift, MATLAB/Simulink, power balance

CLC Number:

TN99

WEI Shenghui,HAO Zhenghang,CHEN Zhuo. Research on MMC Circulation Suppression Strategy Based on SOGI[J].Electronic Science and Technology, 2023, 36(7): 16-23.

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参数名称	数值
MMC桥臂子模块数	20
子模块电容值/mF	5
桥臂电感值/mH	15
子模块电容电压初始值/V	2 000
频率/Hz	50
直流侧电压/kV	20

Research on MMC Circulation Suppression Strategy Based on SOGI

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