文章摘要
朱思丞,赵成勇,李承昱,等.考虑故障限流器动作的直流电网限流电抗器优化配置[J].电力系统自动化,2018,42(15):142-149. DOI: 10.7500/AEPS20180308007.
ZHU Sicheng,ZHAO Chengyong,LI Chengyu, et al.Optimal Configuration of Current-limiting Reactor Considering Fault Current Limiter Action in DC Grid[J].Automation of Electric Power Systems,2018,42(15):142-149. DOI: 10.7500/AEPS20180308007.
考虑故障限流器动作的直流电网限流电抗器优化配置
Optimal Configuration of Current-limiting Reactor Considering Fault Current Limiter Action in DC Grid
DOI:10.7500/AEPS20180308007
关键词: 模块化多电平换流器  高压直流  故障限流器  优化配置
KeyWords: modular multilevel converter(MMC)  high voltage direct current(HVDC)  fault current limiter(FCL)  optimization configuration
上网日期:2018-07-03
基金项目:国家重点研发计划资助项目(2018YFB0904604);国家自然科学基金资助项目(51777072)
作者单位E-mail
朱思丞 新能源电力系统国家重点实验室(华北电力大学), 北京市 102206 zzzss@ncepu.edu.cn 
赵成勇 新能源电力系统国家重点实验室(华北电力大学), 北京市 102206  
李承昱 新能源电力系统国家重点实验室(华北电力大学), 北京市 102206  
许建中 新能源电力系统国家重点实验室(华北电力大学), 北京市 102206  
摘要:
      模块化多电平换流器(MMC)型柔性直流电网作为光伏和风电等新能源汇集的有效手段,其直流故障限流是线路保护所面临的重要技术挑战之一。根据直流电网双极短路故障后电容放电机理,考虑故障限流器投入过程与直流断路器的切断过程,并兼顾了金属氧化物避雷器(MOA)的能量耗散特性,在PSCAD/EMTDC电磁仿真平台下,基于相域频变架空线模型,研究了投入故障限流器后的直流故障电流特性。在对称双极四端直流电网拓扑中,以各个直流出口故障点的直流断路器切断电流之和最小、故障限流器和直流断路器中的MOA吸收的能量之和最小作为两个目标函数,采用simplex算法对直流电网中各条直流线路的限流电抗器进行了多目标优化配置,并给出不同权重下的各条直流线路的限流电抗优化配置方案。
Abstract:
      The modular multilevel converter(MMC)based high voltage direct current(HVDC)grid is an effective solution to transfer the fluctuating renewable source energies such as photovoltage(PV)and wind power, and the DC fault current limiting is one of the most important technical challenges in the line protection. This paper considers the action processes of the fault current limiter(FCL)and DC circuit breaker(DCCB)along with the energy consumption characteristics of the MOAs based on the capacitor discharging mechanism of the bipolar HVDC gird under pole-to-pole short circuit fault. Based on frequency-dependent(phase)line model, the DC fault current characteristics before and after the insertion of the inductive FCL are analyzed on PSCAD/EMTDC. In bipolar four-terminal DC grid, the simplex algorithm is used to optimize the configuration of the fault current-limiting reactors of each DC line with the following two objectives: (1)the minimum sum of the cut-off currents of the DCCB at each DC bus; (2)the minimum sum of the energy consumption of the shunt MOAs of FCLs and the MOAs of DCCBs. The current-limiting reactor optimization configurations of each DC line under various weights are given.
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