不对称电网电压下MMC-HVDC换流站环流抑制策略

doi:10.16180/j.cnki.issn1007-7820.2023.11.010

Abstract

Abstract:

The flexible DC transmission system using modular multilevel converter technology has the problem of bridge arm circulation when the system is running. By analyzing the instantaneous energy of the bridge arm under the asymmetric grid voltage, it is concluded that there are double-frequency positive, negative and zero sequence AC components and DC components in the bridge arm circulating current, and the distribution of the DC components is not equal. To solve the problem of the precise control of AC components, an AC controller based on expected transient amplitude response is proposed. By analyzing the open and closed loop characteristics of the system, it is theoretically proved that the AC controller has the advantages of high control accuracy and good stability. Furtherly, a new circulating current suppression strategy based on the controller is proposed. This strategy can directly control the bridge arm of each phase independently in abc three-phase stationary coordinate without coordinate transformation and phase lock loop. The control structure is simple and can eliminate double-frequency positive, negative and zero sequence circulations at the same time. A 51-level back-to-back transmission system model is built in the MATLAB/Simulink simulation platform, and the correctness and effectiveness of the circulation suppression strategy are verified.

Key words: modular multilevel converter, flexible DC transmission system, asymmetric grid voltage, bridge arm circulation, expected transient amplitude response, open and closed loop characteristics, circulating current suppression, MATLAB/Simulink

CLC Number:

TP202+.1

WANG Zhongyang,YAO Lei,LI Tianhao,GAO Shang. Circulating Current Suppression Strategy for MMC-HVDC Converter Station under Asymmetric Grid Voltage[J].Electronic Science and Technology, 2023, 36(11): 66-75.

Figures/Tables 11

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参数	数值
额定容量S_N/MVA	220(1 pu)
额定功率P_N/MW	220
负载有功功率P_L/MW	110
负载无功功率Q_L/Mvar	0
换流变压器1变比/kV	400/66
换流变压器2变比/kV	66/18
额定直流电压/kV	135
桥臂等效电阻R₀/Ω	0.03
桥臂电感L₀/mH	16.4
子模块电容C₀/μF	10 480
子模块数量N	50
时间常数τ/s	0.001

Circulating Current Suppression Strategy for MMC-HVDC Converter Station under Asymmetric Grid Voltage

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