VSC-HVDC Inverter Control Strategy Based on VSG Technology

doi:10.3969/j.issn.1000-7229.2019.02.013

Abstract

Abstract: With the traditional converter control strategies, the dynamic frequency regulation of the AC power system and the unbalanced power transmission between the AC and DC systems are hard to be involved in voltage source converter based high voltage direct current（VSC-HVDC）system. Aiming at the problem, on the basis of the research on the characteristics of the virtual synchronous generator （VSG） technology, a VSC-HVDC inverter control strategy based on VSG technology is proposed. Firstly, according to the VSC-HVDC system topology model, the feasibility of virtual synchronization of converter station is analyzed. Secondly, the VSG technology with fuzzy PI droop control for active power is introduced into the HVDC transmission system. By adjusting the droop coefficient, the inverter of the flexible HVDC transmission system can ensure the active power transmission balance when the system under steady-state operation and transient faults, so that it has the ability to coordinate control the AC system frequency and the DC system voltage. Finally, a model of three-terminal system is built in Matlab/Simulink for simulation verification. The results show that the VSC-HVDC system can improve the inertial of the AC grid and reduce the change rate of frequency after adopting the VSG control strategy. The FM control can provide better support in the steady state and transient state, which improved the performance of AC and DC system effectively, as well as the reliability of the system.

This work is supported by National Natural Science Foundation of China （No.51667020） and Xinjiang Uygur Autonomous Region Key Laboratory Project（No.2016D3021）

Key words:

CLC Number:

TM 71

LIU Zhongyuan, WANG Weiqing, WANG Haiyun, YUAN Chengyu, WANG Liang, LI Yongqin, DING Wenbin. VSC-HVDC Inverter Control Strategy Based on VSG Technology

[J]. Electric Power Construction, 2019, 40(2): 100-.

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