A Method for Optimizing the VDCOL Parameter to Suppress the Subsequent Commutation Failure of Multi-infeed HVDC System

doi:10.12204/j.issn.1000-7229.2021.05.013

Abstract

Abstract:

Due to the short electrical distance of the inverter stations in multi-infeed HVDC system, the interaction between DC and AC and between DC and DC are more complex. When the AC system is weak, insufficient reactive power support is provided during the fault recovery period, which is easy to cause subsequent commutation failure of multi-infeed HVDC system. Configuration of reactive power compensation devices, optimization of control parameters and other measures are conducive to improve the fault recovery characteristics of HVDC system. This paper proposes a parameter optimization strategy of VDCOL to suppress subsequent commutation failure of multi-infeed HVDC system. The reactive power output of STATCOM is used to measure the recovery degree of HVDC system. Combined with DC voltage as input signal, the input and output characteristics of VDCOL can be adaptively adjusted according to the fault development process, so as to reduce the probability of subsequent commutation failure. A dual-infeed HVDC system model with STATCOM is built in PSCAD/EMTDC, the simulation results verify the effectiveness of the proposed strategy.

Key words: multi-infeed HVDC system, subsequent commutation failure, static synchronous compensator (STATCOM), voltage-dependent current order limitation (VDCOL), parameter optimization strategy

CLC Number:

TM531

LIU Yilun, LIU Jinfei, GAO Hongjun. A Method for Optimizing the VDCOL Parameter to Suppress the Subsequent Commutation Failure of Multi-infeed HVDC System[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(5): 122-129.

Figures/Tables 8

Fig.1 Dual-infeed HVDC system model with STATCOM

Fig.2 U-I characteristic curve of VDCOL

Fig.3 Change curve of γ with QSTATCOM

Fig.4 Different parameters corresponding to the characteristic curve of VDCOL

Fig.5 The improved VDCOL controller

Table 1 Main parameters of dual-infeed HVDC system model with STATCOM

Fig.6 Changes in electrical quantities of the system

Table 2 SCFII of different faults

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