摘要
多条直流同时发生换相失败,短时大额功率冲击将造成送端交流系统区域断面出现大幅功率振荡,甚至解列运行。分析了多直流同时换相失败对送端交流系统稳定性的影响;以功率冲击能量作为衡量换相失败严重程度的依据,基于联络线稳定性指标对多直流同时换相失败引起的送端系统稳定性问题进行了量化分析;研究了直流送端区域差异造成送端系统稳定程度不同的原因;基于换相失败功率冲击能量提出了应对多直流换相失败的直流功率补偿调制方法,＂三华＂电网算例仿真结果验证了所提方法的有效性。该方法能够增强系统应对换相失败功率冲击的能力,减少直流送端切机容量,有助于提高交直流混联电网的运行稳定性和经济性。
When simultaneous multiple HVDC commutation failures occur, large power impact in a short time will cause power oscillation or even splitting operation on regional tie-line in sending system. Influence mechanism of simultaneous multiple HVDC commutation failures on sending-end is researched. DC power impact energy is used as the basis of disturbance degree, and based on tie-line stability criterion, stability problem of sending system caused by simultaneous multiple HVDC commutation failures is quantitatively analyzed. Cause of different stability degrees of system due to regional difference of the sending-end is researched. Based on commutation failure power impact, a new DC power energy compensation modulation method for simultaneous multiple HVDC commutation failures is proposed. Effectiveness of the proposed method is verified with simulation of the actual ＂North-Central-East China＂ system. This method can enhance ability to minimize power impact of commutation failures and reduce generator tripping capacity of DC sending end. It is helpful to improve operation stability and economy of hybrid AC/DC power system.
作者
王少辉
唐飞
刘涤尘
周仕豪
刘福锁
侯玉强
WANG Shaohuil;TANG Fei;LIU Dichenl;ZHOU Shihaol;LIU Fusuo;HOU Yuqiang(School of Electrical Engineering,Wuhan University,Wuhan 430072,Hubei Province,China;NRAI Group Corporation（State Grid Electric Power Research Institute）,Nanjing 211106,Jiangsu Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2018年第9期2876-2884,共9页
Power System Technology
基金
国家自然科学基金项目(51507116)
国家电网公司科技项目(SGHB0000KXJS1800415):面向未来新能源发展的电网多维路径演变量化分析与发展模式研究~~
关键词
多直流同时换相失败
送端稳定性
功率冲击能量
送端区域差异
直流功率能量补偿
simultaneous multi-HVDC commutationfailures
sending-end stability
power impact energy
regionaldifference of sending-end
DC power energy compensation
