摘要
针对特高压直流输电工程中换流变压器(以下简称“换流变”)分接开关频繁动作问题,研究分析了受端换流站分接开关的控制逻辑与参数,从功率调节、交流电压变化等角度探讨了分接开关动作频繁的原因,并提出了两种优化策略:基于预测型熄弧角控制的动态电压调节策略和基于直流电压控制的动态电压调节策略。通过RTDS(实时数字仿真平台)搭建的仿真模型验证了两种策略的有效性。结果表明,第一种策略能显著减少分接开关动作次数,但会牺牲一定的直流电压运行水平;第二种策略在保证直流电压稳定的同时,也能有效降低动作次数,但需要对现有控制策略进行较大调整。两种策略均在仿真和工程实践中取得了良好的优化效果,为降低分接开关动作次数提供了有效途径。
To address the frequent operations of converter transformer tap changers in ultra-high voltage direct current(UHVDC)transmission projects,this paper analyzes the control logic and parameters of tap changers in receiving-end converter stations.The root causes of frequent operations are investigated by examining power regulation and AC voltage variation.Two optimization strategies are proposed:(1)a dynamic voltage regulation strategy based on predictive extinction angle control,and(2)a dynamic voltage regulation strategy based on DC voltage control.The effectiveness of both strategies is verified through real-time digital simulator(RTDS)-based simulation models.Results demonstrate that while Strategy 1 significantly reduces tap-changer operations at the cost of certain DC voltage operating levels,Strategy 2 effectively decreases operations while maintaining DC voltage stability,albeit requiring substantial modifications to existing control strategies.Both strategies demonstrate satisfactory optimization effects in simulations and engineering practice,providing effective solutions to reduce tap-changer operations.
作者
龚凌云
钱松林
侯贺伟
年长春
GONG Lingyun;QIAN Songlin;HOU Hewei;NIAN Changchun(EHV Branch Company of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China)
出处
《浙江电力》
2025年第12期107-113,共7页
Zhejiang Electric Power
基金
国家电网有限公司科技项目(521101230011)。
关键词
换流站
换流变分接开关
直流电压控制
动作次数
RTDS仿真
converter station
converter transformer tap-changer
DC voltage control
operation count
RTDSbased simulation
