基于改进型限流混合式直流断路器的开断时序优化研究  

Research of Opening Timing Optimization Based on Improved Current-Limiting Hybrid DC Circuit Breaker

作　　者：束洪春[1,2,3] 邵宗学 旷宇 Shu Hongchun;Shao Zongxue;Kuang Yu(Yunnan Key Laboratory of Green Energy and Digital Power Measurement Control and Protection Kunming University of Science and Technology,Kunming 650500 China;Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology,Kunming 650500 China;Faculty of Electric Power Engineering Kunming University of Science and Technology,Kunming 650500 China)

机构地区：[1]昆明理工大学云南省绿色能源与数字电力量测及控保重点实验室,昆明650500 [2]昆明理工大学机电工程学院,昆明650500 [3]昆明理工大学电力工程学院,昆明650500

出　　处：《电工技术学报》2023年第22期6176-6187,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点项目(52037003);云南省重大科技专项计划项目(202002AF080001);中国工程院战略研究与咨询项目(2022YNZH6)资助。

摘　　要：直流故障限流与开断是保证直流输电安全稳定运行的关键技术。该文提出基于限流混合式直流断路器的开断时间配合及泄能优化方案,即以减少泄能支路吸收能量和降低直流断路器的电力电子开关器件投资成本为其优化目标,转移支路IGBT的耐压应力及直流开断时间为约束条件,将其转化为求解多目标优化数学问题,得出断路器最佳配合动作时序。大量仿真测试表明该优化方案正确有效。MMC-based flexible DC network has the characteristics of flexible control and easy power support,which provides an effective solution for large-scale green energy aggregation and outgoing transmission.However,it also faces difficulties such as fast development of DC faults and difficulties in DC opening,and fast removal of DC faults is a basic requirement to ensure safe and reliable operation of DC networks.DC fault current limiting and opening is the key technology to ensure the safe and stable operation of DC power transmission.The optimization scheme of opening time matching and energy release based on current-limited hybrid DC circuit breaker is proposed.The optimization goal is to reduce the energy absorbed by the energy dissipation branch and lower the investment cost of the DC circuit breaker's power electronic switching devices.The voltage stress on the transfer branch IGBT and the DC disconnection time are set as constraints,it is made into solving multi-objective optimization mathematical problems,deriving the best timing for circuit breaker operation.Numerous simulations have shown that the optimization scheme is correct and effective.In order to improve the opening performance of DCBB,an optimization scheme of opening time coordination and energy discharge based on current-limiting hybrid DC circuit breaker is proposed.Firstly,the hybrid DC circuit breaker topology is improved,and the transfer and suppression of fault energy in the DCBB and the release process are derived.Then,a multi-objective optimization model is constructed for the breaker opening and breaking coordination timing to solve the best coordination timing of the breaker.Finally,a four-terminal DC grid simulation model is built in the PSCAD/EMTDC simulation platform to verify the effectiveness of the proposed optimization.A±500kV four-terminal MMC DC grid simulation model is built on the PSCAD/EMTDC platform.MMC1 adopts constant voltage and reactive power control mode,while MMC2,MMC3 and MMC4 adopt constant active and reactive power co

关 键 词：直流电网 限流混合式直流断路器 限流与开断 泄能 多目标优化 

分 类 号：TM561[电气工程—电器]