大容量直流换相失败后功率恢复速率对送端系统暂态稳定的影响分析  

Analysis of Impact of Power Recovery Speed on Transient Stability of Sending-side System After Large Capacity HVDC Commutation Failure

作　　者：王增平 胡加伟 王彤 时伯年[2] WANG Zengping;HU Jiawei;WANG Tong;SHI Bonian(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;Beijing Sifang Automation Co.,Ltd.,Haidian District,Beijing 100085,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]北京四方继保自动化股份有限公司,北京市海淀区100085

出　　处：《电网技术》2020年第5期1815-1824,共10页Power System Technology

基　　金：国家重点研发计划:智能电网技术与装备重点专项(2016YFB0900604);国家自然科学基金重点项目(51637005);国家电网有限公司科技项目(SGBJDK00KJJS1900088)(特大型电网系统级控制保护技术框架研究与设计)。

摘　　要：电网换相换流器型直流输电(LCC-HVDC)换相失败无法避免。伴随大容量高压直流线路的相继投运,直流换相失败对系统暂态稳定性的影响愈发严重。针对交直流异步互联系统,从理论上推导直流换相失败后功率恢复速率对送端系统暂态稳定性的影响。首先,利用ramp函数建立直流换相失败后功率恢复模型,表征功率恢复速率的大小,进而理论推导了直流功率恢复速率对送端系统暂态稳定性的影响;其次,分析了低压限流(VDCOL)控制参数和换相失败预测(CFPREV)控制参数对功率恢复速率的影响,在此基础上,进一步分析了其对送端系统暂态稳定的影响。最后在改进的IEEE-39节点系统及实际电力系统中进行测试,通过仿真验证了以上理论分析的正确性。The commutation failure of line commutated converter high voltage direct current(LCC-HVDC) is inevitable. As the HVDC with large capacity are continually put into operation, the impact of HVDC commutation failure on transient system stability becomes more and more serious. In this paper, the impact of the power recovery speed after HVDC commutation failure on transient stability of sendingside system is theoretically derived for AC/DC asynchronous interconnection system. Firstly, a power recovery model after HVDC commutation failure is established using ramp function to characterize the power recovery speed, and the impact of power recovery speed on transient stability of sending-side system is theoretically derived. Secondly, the effects of voltage dependent current order limiter control(VDCOL) parameters and commutation failure prevention(CFPREV) parameters on the power recovery speed are analyzed. On this basis, the impact on transient stability of the sending-side system is further analyzed. Finally, extensive tests are carried out in improved IEEE 39-bus system and actual power system, and correctness of the proposed theoretical analysis are verified by simulation results.

关 键 词：交直流异步互联 换相失败 直流功率恢复速率 送端暂态稳定性 

分 类 号：TM721[电气工程—电力系统及自动化]