A Bypass Pair Control Strategy for Commutation Failure Mitigation in Multi-infeed DC System

doi:10.12204/j.issn.1000-7229.2022.06.006

Abstract

Abstract:

As an inherent drawback of LCC-UHVDC, commutation failure often causes dramatic reactive power fluctuation in the AC power grid both on the rectifier side and the inverter side. The application of bypass pair is one of the important control strategies of DC system protection. When a fault occurs in the HVDC system, the switch of bypass pair after the protection action of the inverter side will help to achieve the purpose of stopping the HVDC system quickly and isolating the fault. At present, the research of bypass pair is mainly focused on the application under DC fault cases, whereas the application of that in commutation failure is lacking. According to the analysis of the impact of bypass control on the voltage characteristics on the rectifier side and the inverter side, this paper demonstrates the contribution of reasonable bypass control on improving the voltage characteristics of UHVDC transmission line after commutation failure. And a bypass pair control scheme is proposed, which takes the commutation failure in inverter valves and the reduction of AC bus voltage as the initialization criterion to dynamically adjust DC current. Then, the bypass pair will quit as the system recovering. The effectiveness of the proposed bypass pair control scheme on isolating AC and DC systems and reliving the reactive power and the voltage fluctuation during the transient process of AC system fault is verified in PSCAD/EMTDC.

Key words: UHVDC, commutation failure, bypass pair, voltage stability

CLC Number:

TM773

ZHANG Chaofeng, ZHANG Weichen, RAO Yufei, XIA Qiu, LI Chenghao, BAO Chaobin. A Bypass Pair Control Strategy for Commutation Failure Mitigation in Multi-infeed DC System[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(6): 56-65.

Figures/Tables 18

Fig.1 Circuit under stable operation andbypass switch

Fig.2 Current waveform under bypass control

Fig.3 Reactive power absorbed by the inverter under bypass control

Fig.4 Main circuit of CIGRE HVDC standard test model

Fig.5 Response curves of electrical parameters on the inverter side

Fig.6 Response curves of the electrical parameters on the rectifier side

Fig.7 Basic control structure of bypass control

Fig.8 Operating curve of VDCOL

Fig.9 Flowchart of bypass control

Fig.10 Diagram of bypass control signal calculation

Fig.11 Structure of Henan UHVDC multi-infeed system

Fig.12 Bypass control signal

Fig.13 Comparison of DC current at sending-end of DC system 1 before and after bypass control

Fig.14 Comparison of bus voltage and reactive power absorption of DC system 1 before and after bypass control

Fig.15 Effectiveness of bypass control under single-phase-to-ground fault

Table 1 Bypass turn-on time

Fig.16 Comparison of parameters on the inverter side under two control schemes

Fig.17 Comparison of parameters on the rectifier side under two control schemes

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