摘要
目前,考虑多种影响因素并采用详细直流输电控制系统模型,针对STATCOM对换相失败的影响进行定性和定量分析的研究较少。基于实际工程控制逻辑和参数,搭建逆变侧含链式STATCOM的高压直流输电PSCAD/EMTDC模型,考虑STATCOM和高压直流输电功能模块的相互作用以及其他影响因素,以换相失败免疫因子、换相失败持续时间和恢复时间为性能分析指标,对STATCOM影响进行分析评估。研究表明:STATCOM容量不仅直接影响交流系统强度,还影响HVDC系统换相失败预测和低压限流模块的输出大小,从直接和间接两方面影响系统连续换相失败期间和恢复时的运行特性;在一个周期内不同时刻,STATCOM均能有效增强系统抵御换相失败的能力,缩短换相失败持续时间和恢复时间的平均时长分别为0~3 ms和7 ms^11ms;相较于单次换相失败,STATCOM对连续换相失败的改善效果更大,而对更为严重的金属性接地故障,由于其容量限制,改善效果不明显。研究对以后直流工程中STATCOM的选择和优化具有一定借鉴作用。
At present,there is less research on the effect of STATCOM on commutation failure with many factors and the detailed control system model. Based on the actual engineering parameters,the PSCAD/EMTDC model of HVDC transmission system with STATCOM is established,and the DC transmission control system is built according to the predictive control system. Considering the factors including AC electrical cycle characteristics,STATCOM rated capacity and fault type,and considering the interaction of STATCOM and HVDC transmission module,the commutation failure immunity factor,commutation failure time duration and recovery performance analysis index are used to evaluate the role of STATCOM. Research shows that the ability of STATCOM can effectively enhance the system against commutation failure,shorten commutation failure duration and recovery time,and shorten the length were 0 ~ 3 ms and 7 ms ~ 11 ms in a period of different time,the results show that increasing the STATCOM rated capacity can further play its positive role; Compared with the single phase commutation failure,the STATCOM has a better effect on the continuous commutation failure,but for the more severe metal grounding faults,the improvement effect is not obvious because of its capacity limit. The difference of STATCOM capacity will affect the prediction of commutation failure and the output of low voltage current limiter. The research has certain reference function to the STATCOM selection and optimization in HVDC project in the future.
作者
高本锋
毛亚鹏
Gao Benfeng;Mao Yapeng(State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China)
出处
《电测与仪表》
北大核心
2018年第10期68-75,共8页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51507064)
河北省教育厅科研资助项目(Z2015041)
