一种抑制多馈入直流系统后续换相失败的低压限流单元参数优化策略

doi:10.12204/j.issn.1000-7229.2021.05.013

摘要/Abstract

摘要：

多馈入直流输电系统受端换流站电气距离近,直流系统与交流系统之间、直流系统与直流系统之间相互作用也更为复杂。当交流系统较弱时,故障恢复期间提供的无功支撑不足,容易引起多回直流系统发生后续换相失败。配置无功补偿装置,优化控制环节参数等措施均有利于改善直流系统的故障恢复特性。基于此,提出一种抑制多馈入直流系统后续换相失败的低压限流单元参数优化策略,利用静止同步补偿器(static synchronous compensator,STATCOM)输出的无功大小来衡量直流系统恢复程度,并将STATCOM输出的无功功率和直流电压相结合作为输入信号,随故障发展过程自适应调整低压限流单元输入输出特性,降低系统发生后续换相失败的概率。在PSCAD/EMTDC中搭建含STATCOM的双馈入直流输电系统模型,仿真结果验证了所提策略的有效性。

关键词: 多馈入直流系统, 后续换相失败, 静止同步补偿器(STATCOM), 低压限流(VDCOL), 参数优化

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

中图分类号:

TM531

刘一论, 刘进飞, 高红均. 一种抑制多馈入直流系统后续换相失败的低压限流单元参数优化策略[J]. 电力建设, 2021, 42(5): 122-129.

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.

图/表 8

图1 含STATCOM的双馈入直流输电系统结构

Fig.1 Dual-infeed HVDC system model with STATCOM

图2 低压限流控制单元的U-I特性曲线

Fig.2 U-I characteristic curve of VDCOL

图3 关断角随STATCOM无功功率变化曲线

Fig.3 Change curve of γ with QSTATCOM

图4 不同参数对应的VDCOL特性曲线

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

图5 改进VDCOL控制器

Fig.5 The improved VDCOL controller

表1 含STATCOM的双馈入直流系统主要参数

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

图6 系统电气量变化

Fig.6 Changes in electrical quantities of the system

表2 不同故障下的SCFII值

Table 2 SCFII of different faults

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