A Novel Control Strategy for AC Fault Ride Through in Multi-terminal DC System

doi:10.12096/j.2096-4528.pgt.22055

Abstract

Abstract:

This paper proposed a novel control strategy-coordinated DC voltage control (DCVC)-to enhance the AC fault ride through capability of multi-terminal high voltage direct current (HVDC) system. This control strategy is independent on exact line impedance parameters, and has a better performance than the conventional voltage droop control on keeping DC voltage constant and distributing power fast and flexibly. During the AC fault period, this novel control strategy is able to avoid the overvoltage of HVDC lines and make full use of active power by combing power distribution ratio adjustment and a series of AC fault ride through some methods, including voltage reduction, frequency increase and DC chopper methods. The control effect was validated by a five-terminal HVDC system based on PSCAD/EMTDC under different degrees of AC fault.

Key words: offshore wind farm, multi-terminal direct current, coordinated control strategy, DC chopper, fault ride through

CLC Number:

TK 83

Zhou YANG, Renxin YANG, Gang SHI, Jianwen ZHANG. A Novel Control Strategy for AC Fault Ride Through in Multi-terminal DC System[J]. Power Generation Technology, 2022, 43(2): 268-277.

Figures/Tables 10

Fig. 1 A five-terminal HVDC system

Fig. 2 Coordinated DC voltage control strategy

Fig. 3 DC equivalent circuit of five-terminal DC system

Fig. 4 The novel FRT strategy of the GSVSC i at the local station

Fig. 5 Simplified control block of DC voltage

Fig. 6 Voltage and current characteristic curve of converter station on grid side controlled by CDVC

Fig. 7 Power reduction methods of WFVSC

Tab. 1 Parameters of DC cables

参数	电缆1	电缆2	电缆3	电缆4	电缆5
电阻/Ω	0.2	0.3	0.4	0.3	0.2
电感/mH	7.5	7.5	7.5	7.5	7.5
电容/μF	7.5	7.5	7.5	7.5	7.5

Fig. 8 Effect comparison of different control strategoes for minor AC faults

Fig. 9 Effect comparison of different control policies for severe AC faults

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