引用本文: | 朱明琳,杭丽君,李国杰.多变量保护控制策略下换流器对并网点电压支撑作用研究[J].电力系统保护与控制,2018,46(6):38-45.[点击复制] |
ZHU Minglin,HANG Lijun,LI Guojie.Investigation of multi-variable protected strategies with voltage support under grid faults[J].Power System Protection and Control,2018,46(6):38-45[点击复制] |
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摘要: |
交流电网故障下,为了实现分布式并网发电系统的低电压穿越,需要对并网点电压进行动态支撑。为获得对并网点电压最优动态支撑的效果,在电网故障情况下,采用多变量保护控制算法,对注入的有功功率与无功功率进行了合理设计。首先回顾了分布式发电中常用的换流器拓扑结构,并对多变量保护控制算法进行了简述。基于此,给出了并网规范下换流器交流侧电压正序负序分量计算原则,并给出最优电压支撑效果下需注入的功率的计算公式以及交流电流dq轴参考值的计算流程图。最后,在Matlab/Simulink仿真平台上对所提出的理论计算和设计方法进行仿真验证。 |
关键词: 电网电压不平衡 多变量保护控制 电压支撑 分布式电源 参数设计 |
DOI:10.7667/PSPC170385 |
投稿时间:2017-03-17修订日期:2017-05-15 |
基金项目:国家重点研发计划课题(2016YFB0900201)“光伏直流并网接入实证研究平台系统集成技术及工程化技术” |
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Investigation of multi-variable protected strategies with voltage support under grid faults |
ZHU Minglin,HANG Lijun,LI Guojie |
(Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University, Shanghai 200240, China;State Grid Shanghai Songjiang Power Supply Company, Shanghai 201600, China) |
Abstract: |
In the Distribution Generation (DG) grid-connected system, in order to realize the Low-Voltage Ride-Through (LVRT) ability, it is necessary to dynamically support the grid voltage under grid faults. In order to obtain the best support effect on the PCC voltage, the design methods of active and reactive power injections are proposed using the multi-variable protected method. First, the topologies in the DG systems and the multi-variable protected method are introduced. Then calculation principle of the positive- and negative-sequence components of converter AC side under grid codes is deduced. The formula for calculating injected power under optimal voltage support is given, and the calculation process of the AC current reference in dq axis is proposed. Finally, a simulation platform based on Matlab/Simulink is established to verify the theoretical analysis and design methods. This work is supported by National Key Research and Development Project of China (No. 2016YFB0900201). |
Key words: unbalanced grid voltages multi-variable protection control voltage support DG parameter design |