摘要
换相失败主要发生于直流输电系统逆变器中,仅通过减小触发延迟角来抑制逆变器换相失败有其局限性。通过逆变器正常换相过程及交流系统故障情况下换相失败机理的分析,指出可通过控制流过逆变器的直流电流来抑制其换相失败的发生;在对现有换相失败预测控制模块(commutation failure prevention,CFPREV)及上述机理分析的基础上,提出了一种适用于逆变器换相失败预测控制的直流电流预测整定方法;最后通过CIGRE HVDC标准测试系统中的仿真测试,验证了算法的有效性,为当前换相失败预防控制措施的研究提供了新的研究方向。
Commutation failure mainly occurs in the inverter of HVDC power transmission system and there is inherent limitation for the method to suppress commutation failure of inverter only by decreasing the firing delay angle. According to normal commutation process of inverter and analyzing commutation failure mechanism under AC system fault, it is pointed out that the probability of commutation failure can be decreased by controlling the DC current flowing through the inverter. Based on the analysis on existing commutation failure prevention （CFPREV） module and above-mentioned mechanism analysis, a DC current presetting method suitable for the predictive control of commutation failure in the inverter is proposed. Through simulation testing by standard CIGRE HVDC benchmark testing model the effectiveness of the proposed approach is validated.
出处
《电网技术》
EI
CSCD
北大核心
2014年第3期565-570,共6页
Power System Technology
基金
国家自然科学基金资助项目(51277052
51107032
61104045)
国家电网公司大电网重大专项资助项目课题(SGCC-MPLG025-2012)~~
关键词
高压直流输电
换相失败
逆变器
直流电流控制
预测控制
HVDC power transmission
commutationfailure
inverter
direct current control
predictive control
