Evaluation Index of Transient Overvoltage During Fault at HVDC Sending-End AC System

doi:10.12204/j.issn.1000-7229.2023.01.008

Abstract

Abstract:

The transient overvoltage caused by the DC blocking fault of the UHVDC transmission system and the short-circuit fault of the AC system has a serious impact on the stability of the system. Quantitative assessment of the transient performance index has important guiding significance for the dispatching operation of AC/DC power system. This paper analyzes the mechanism of transient overvoltage in AC system, deduces the calculation method of transient overvoltage on the basis of reactive power compensation and short-circuit ratio, and then defines the transient voltage evaluation index R_r. Research shows that, as the index R_r decreases, the transient voltage of the commutation bus at the sending end will increase after a system fault, and commutation failures will also occur at the receiving end. Finally, on the basis of the CIGRE benchmark HVDC standard test system, the effectiveness of the proposed index R_r is verified.

This work is supported by State Grid Science and Technology Project (No. 5230HQ21000S).

Key words: ultra-high voltage direct current transmission, transient overvoltage, evaluation index, sending-end AC system

CLC Number:

TM721

LIU Xiaolin, CAO Zeyu, GAO Bingtuan, JIANG Weiyong, ZHOU Zhuan, WANG Xingang, ZHANG Feng. Evaluation Index of Transient Overvoltage During Fault at HVDC Sending-End AC System[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(1): 64-72.

Figures/Tables 14

Fig.1 Schematic diagram of a DC transmission system circuit

Fig.2 Control block diagram of the inverter side of HVDC system

Fig.3 Equivalent circuit on the rectifier side of HVDC system

Fig.4 Test system

Table 1 Test system parameters

Fig.5 Transient response curve under three-phase short-circuit fault

Fig.6 Transient response curve under DC blocking fault

Table 2 Transient voltage changes of three-phase short-circuit faults with reactive compensation

Table 3 Transient voltage changes of DC blocking faults with reactive compensation

Table 4 Transient voltage changes of three-phase short-circuit faults considering SCR

Table 5 Transient voltage changes of DC blocking faults considering SCR

Fig.7 The relationship between transient overvoltage and indicator Rr

Fig.8 Control angle response under three-phase short-circuit fault

Fig.9 The effect of commutation failure on transient voltage and turn-off angle

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