A Variable-Slope Current Deviation Control Method to Suppress Subsequent Commutation Failure

doi:10.12204/j.issn.1000-7229.2023.01.009

Abstract

Abstract:

In order to reduce the risk of subsequent commutation failure in HVDC transmission system, the commutation failure mechanism is analyzed, and combined with symmetrical and asymmetric fault detectors, an improved scheme of current deviation control which can be adjusted according to the severity of fault is proposed. The suppression effect of the slope of current deviation control on commutation failure is analyzed. It is found that the larger the slope of slope function in current deviation control is, the more sensitive it is to input current deviation, and the larger the commutation margin increment is, the more conducive it is to suppress subsequent commutation failure. Finally, the proposed control scheme is realized on the basis of CIGRE HVDC Standard Test System in PSCAD / EMTDC simulation software. The simulation results show that the current deviation control method proposed in this paper can effectively reduce the risk of subsequent commutation failure of HVDC system and improve the operation characteristics of HVDC system.

This work is supported by State Grid Corporation of China Research Program (No.52130420001S).

Key words: high voltage DC transmission, subsequent commutation failure, current deviation control, commutation margin

CLC Number:

TM72

CHAO Wujie, DENG Chaoping, HUANG Junwei, LI Yuanqi, WANG Yuhong, CHEN Liwei. A Variable-Slope Current Deviation Control Method to Suppress Subsequent Commutation Failure[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(1): 73-81.

Figures/Tables 10

Fig.1 Control structure of CIGRE HVDC standard test system

Fig.2 Static volt-ampere characteristics of the complete control system

Fig.3 Static characteristic curve of current deviation control

Fig.4 Structure diagram of variable-slope current deviation control

Fig.5 CEC characteristic curve of Scheme 1

Fig.6 CEC characteristic curve of Scheme 2

Fig.7 CEC characteristic curve of Scheme 3

Fig.8 System operation performance under three-phase fault with Lf= 0.6 H

Fig.9 System operation performance under single-phase fault with Lf= 0.4 H

Table 1 Number of continuous commutation failures in HVDC under four control methods

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