Subsequent Commutation Failure Mechanism Analysis and Prevention of MIDC System Considering Interaction of Grid Side Energy Storage
尹寒航 1周小平 1陈燕东 1邓凌峰 1洪乐荣 1朱仁龙1
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作者信息
1. 国家电能变换与控制工程技术研究中心(湖南大学),长沙 410082
折叠
摘要
利用电网侧储能的无功支撑能力有望改善多馈入直流输电(multi-infeed high voltage direct current,MIDC)的电压暂态特性,但是电网侧储能接入后,电力电子装备之间的相互作用会影响MIDC控制特性.在计及电网侧储能与MIDC交互作用基础上,分析了故障持续阶段与故障清除阶段的MIDC后续换相失败机理.研究表明,在故障持续阶段,由于电网侧储能的交互作用,定电流控制切换为定关断角控制时直流电流更大,并且电流偏差控制输出减少使越前触发角下降,造成换相供给面积不足的影响更大;在故障清除阶段,计及直流电流振荡影响,越前触发角下降及大幅波动会导致换相供给面积不足;在MIDC系统处于功率恢复过程中,若电网侧储能无功功率指令置为0,将增大后续换相失败风险.然后,针对电网侧储能以及MIDC控制策略进行改进,提出了计及电网侧储能交互作用的MIDC后续换相失败抑制策略.最后,在多种故障类型下仿真验证了所提控制策略有效性.
Abstract
The reactive power support capability of grid side energy storage is expected to improve the voltage charac-teristic of multi-infeed high voltage direct current(MIDC).However,the interaction between power electronic equipment affects the control characteristic of MIDC.This paper analyzes the subsequent commutation failure(SCF)mechanism considering the interaction of grid side energy storage.It is found that,during the fault duration stage,the DC current value is greater when the constant current control is switched to the constant extinction angle control,and the reduction of current deviation control causes the decrease of the advance angle,which leads to the insufficient commutation supply area.During the fault clearing stage,the decrease of advance angle and large fluctuation may lead to insufficient commu-tation supply area.Also,if the MIDC power recovery process is underway when the reactive power instruction of grid side energy storage is set to zero,the SCF risk is aggravated.Thus,by improving the grid side energy storage and MIDC control strategy,the SCF prevention strategy of MIDC considering the interaction of grid side energy storage is proposed.Finally,the effectiveness of the proposed control strategy is verified under various fault types.
关键词
多馈入直流输电系统/电网侧储能/后续换相失败/机理分析/抑制策略
Key words
multi-infeed HVDC system/grid side energy storage/subsequent commutation failure/mechanism analysis/prevention control
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