摘要
针对电网远端发生故障引起的换流器电压出现骤降以及电网受到冲击等问题,提出一种计及无功支撑的低电压穿越(LVRT)控制策略。首先,从电流控制内环角度分析低电压穿越补偿机理,建立相应的附加控制策略;然后,提出附加控制策略,在电压跌落后重新计算并分配有功电流和无功电流指令传到电流内环控制器,在保证稳定运行的同时提供一定的无功功率支持电压恢复;最后,以柔性电力电子开关(SOP)为研究对象,利用PSCAD/EMTDC仿真软件搭建了仿真模型,对提出的LVRT附加策略与不加LVRT的策略进行了仿真结果对比分析,验证了控制策略的可行性。
Aiming at solving the problems such as the sudden drop of the converter voltage and the impact of the grid caused by the fault at the remote end of the grid,a low voltage ride-through(LVRT)control strategy that takes into account the reactive power support is proposed.First,the low voltage ride-through compensation mechanism was analysed from the perspective of the current control inner loop,and the corresponding additional control strategy was established;secondly,the proposed additional control strategy can recalculate and distribute the active current and reactive current commands to the current inner loop controller after the voltage drops,so as to ensure stable operation and provide certain reactive power to support voltage recovery;finally,taking soft open points(SOP)as the research object,a simulation model was built by using PSCAD/EMTDC simulation software.By comparing the proposed LVRT additional strategy with the strategy without LVRT and analysing the simulation results,the LVRT of SOP is realized,which verifies the feasibility of the proposed control strategy and meets the requirements of LVRT.
作者
张蝶
袁旭峰
张腊华
杨荣
班国邦
ZHANG Die;YUAN Xufeng;ZHANG Lahua;YANG Rong;BAN Guobang(The Electrical Engineering College,Guizhou University,Guiyang 550025,China;Electric Power Research Institute,Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China)
出处
《电力科学与工程》
2021年第9期1-9,共9页
Electric Power Science and Engineering
基金
国家自然科学基金(52067004)
贵州省科学技术基金([2019]1128)
贵州省科学技术基金([2019]1058)。
