摘要
高压直流输电(HVDC)系统的后续换相失败严重威胁交直流混联电网的安稳运行。为抵御后续换相失败,文中结合首次换相失败后故障恢复过程中直流系统的功率恢复速度,考虑交流故障严重程度,提出一种抑制直流后续换相失败的自适应动态调节触发角的控制方法。首先,分析了故障恢复过程中各电气量的变化规律以及后续换相失败发生的影响因素;然后根据直流功率恢复速度以及交流电压跌落程度,通过所提控制方法对故障期间逆变侧输出触发角进行动态调整,以增大换相裕度,从而抑制直流后续换相失败;最后,基于CIGRE-HVDC标准测试模型对控制方法进行仿真验证。结果表明,采用所提控制方法能够根据电压跌落程度及直流功率恢复特征自适应地调整触发角补偿大小,进而提高换相裕度,抑制后续换相失败,并加快HVDC系统的故障恢复速度。
Subsequent commutation failure of the high voltage direct current(HVDC)transmission system has a seriously negative impact on the stable operation of the AC-DC hybrid power grid.To reduce the probability of subsequent commutation failure,an adaptive control method for adjusting the power recovery rate of the DC system is proposed in this paper,which combines the power recovery rate of the DC system during the recovery process after the first commutation failure with the severity of AC failure.Firstly,the law of the electric quantity change during the fault recovery process and the factors affecting the subsequent commutation failure are analyzed.Secondly,according to the power recovery rate and the AC voltage drop,the trigger angle of the inverter side during the fault is dynamically adjusted by the proposed control strategy to increase the commutation margin,thereby suppressing the subsequent commutation failure for HVDC.Finally,the control method is simulated and verified based on the CIGRE benchmark model of HVDC.The results show that the proposed control method can adjust the compensation size of compensating trigger angle adaptively according to the voltage drop and DC power recovery characteristics,thereby improving the commutation margin to suppress subsequent commutation failures and speeding up the HVDC system failure recovery.
作者
杨程祥
姚伟
周泓宇
李培平
李程昊
文劲宇
YANG Chengxiang;YAO Wei;ZHOU Hongyu;LI Peiping;LI Chenghao;WEN Jinyu(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,China;State Grid Jinan Power Supply Company of Shandong Electric Power Company,Jinan 250012,China;State Grid He'nan Electric Power Company Research Institute,Zhengzhou 450052,China)
出处
《电力工程技术》
北大核心
2022年第2期10-19,共10页
Electric Power Engineering Technology
基金
国家自然科学基金资助项目(52022035)
国家电网有限公司总部科技项目“电化学储能电站群在特高压交直流混联受端电网应用关键技术研究及示范”(5419-201924207A-0-0-00)。