考虑新能源集群孤网接入的柔直换流站稳态运行区间研究  

Study on Steady-state Operation Region of VSC-HVDC Converter Station Connecting New Energy Cluster by Isolated Network

作　　者：刘莹[1] 吴林林[2] 徐曼[2] 王泽忠[1] Liu Ying Wu Linlin Xu Man Wang Zezhong(North China Electric Power University, Beijing 102206, China State Grid Jibei Electric Power Co. Ltd. Research Institute, North China Electric Power Research Institute Co. Ltd., Beijing 100045, China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司),北京100045

出　　处：《华北电力技术》2017年第6期8-13,共6页North China Electric Power

摘　　要：大规模弱抗扰新能源孤网接入柔性直流输电系统(Voltage Source Converter Based High Voltage Direct Current,VSC-HVDC)时,换流站稳态运行范围需考虑新能源集群安全运行的要求。基于新能源集群与送端换流站等值系统,研究了考虑新能源集群孤网接入的柔直电网换流站稳态运行区间约束条件,分析了联结变压器分接头位置、柔直交流电压设定值、新能源集群与柔直送端换流站等效距离的阻抗特性对稳态运行区间的影响,为新能源-柔直孤网系统的换流站稳定运行范围确定提供了可行方法。计算结果表明,当调节联结变压器分接头时,换流站稳态运行区间随分接头上移而向下移动;当改变柔直交流电压参考值时,稳态运行范围随着参考电压升高而向下移动;当改变等效线路阻抗特性,电气距离增加运行范围缩小,阻抗比减小,输送大功率时运行范围变大。When the large-scale and weak interference new energy cluster is connected to the VSC-HVDC system with the isolated network operation mode, the safe operation of the new energy cluster should be considered in the steady- state operation interval of the converter station. Based on the equivalent system of new energy cluster and converter station, considering the new energy with the isolated network operation mode ,the constraint conditions of the steady- state operation interval of the VSC-HVDC converter station is studied. The influence of various operations on the steady-state operation interval is analyzed,such as connecting transformer tap,the VSC-HVDC reference voltage,the impedance characteristics of equivalent distance of the new energy cluster and the VSC-HVDC converter station. It provides a practicable method for the determination of the stable operation of the converter station. Results show that the steady-state operation interval moves down with the tap move on and when adjusting the coupling translation; When the VSC-HVDC voltage reference value is changed,the steady-state operating range moves down with the refer- ence voltage increase;When the impedance characteristics of the equivalent circuit are changed, the operation range is reduced with the increase of the electrical distance;When the impedance ratio is reduced,the operation range be- comes larger under high power transmission.

关 键 词：新能源集群 孤网运行方式 柔直系统 稳态运行区间 约束条件 

分 类 号：TM721[电气工程—电力系统及自动化]