| 适用于交流保护整定的MMC-HVDC接入母线故障等效模型 |
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| 引用本文： | 刘若平,屠卿瑞,李银红,罗强,雷淇. 适用于交流保护整定的MMC-HVDC接入母线故障等效模型[J]. 电力系统自动化, 2019, 43(18): 145-153 |
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| 作者姓名： | 刘若平 屠卿瑞 李银红 罗强 雷淇 |
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| 作者单位： | 华中科技大学电气与电子工程学院,湖北省武汉市430074;强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074;电力安全与高效湖北省重点实验室(华中科技大学),湖北省武汉市430074;广东电网有限责任公司电网规划研究中心,广东省广州市510062;广东电网有限责任公司电力调度控制中心,广东省广州市,510600;华中科技大学电气与电子工程学院,湖北省武汉市430074;强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074;电力安全与高效湖北省重点实验室(华中科技大学),湖北省武汉市430074 |
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| 基金项目： | 国家重点研发计划资助项目(2016YFB0900101) |
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| 摘 要： | 模块化多电平换流器型高压直流(MMC-HVDC)输电系统接入电网后将对交流系统短路电流产生影响，但目前交流保护整定计算通常忽略MMC-HVDC接入母线故障时模块化多电平换流器对短路电流的贡献。文中以交流保护整定计算为出发点，提出了MMC-HVDC系统简化分析原则。在分析MMC-HVDC系统控制特性的基础上，建立了适用于交流保护整定计算的MMC-HVDC等效模型，提出MMC-HVDC接入母线故障时可以将直流侧等效为一个正序电流源。研究了MMC-HVDC接入母线故障时不同故障点残压下MMC-HVDC直流侧响应特性，确定了等效电流源的幅值和相位，并进行了仿真验证。最后，提出了MMC-HVDC对交流保护整定计算影响的定量评估指标及其计算方法。
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| 关 键 词： | 模块化多电平换流器 高压直流输电 接入母线故障 等效模型 响应特性 |
| 收稿时间： | 2018-12-18 |
| 修稿时间： | 2019-08-11 |
Equivalent Model of MMC-HVDC for AC Protection Setting with Access Bus Fault |
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| LIU Ruoping,TU Qingrui,LI Yinhong,LUO Qiang and LEI Qi. Equivalent Model of MMC-HVDC for AC Protection Setting with Access Bus Fault[J]. Automation of Electric Power Systems, 2019, 43(18): 145-153 |
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| Authors: | LIU Ruoping TU Qingrui LI Yinhong LUO Qiang LEI Qi |
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| Affiliation: | School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, China; Key Laboratory of Electric Power Security and High Efficiency of Hubei Province (Huazhong University of Science and Technology), Guangzhou 430074, China; Power System Planning Research Center of Guangdong Power Grid Co., Ltd., Wuhan 510062, China,Electric Power Dispatching and Control Center of Guangdong Power Grid Co., Ltd., Guangzhou 510600, China,School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, China; Key Laboratory of Electric Power Security and High Efficiency of Hubei Province (Huazhong University of Science and Technology), Guangzhou 430074, China,School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, China; Key Laboratory of Electric Power Security and High Efficiency of Hubei Province (Huazhong University of Science and Technology), Guangzhou 430074, China; Power System Planning Research Center of Guangdong Power Grid Co., Ltd., Wuhan 510062, China and School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, China; Key Laboratory of Electric Power Security and High Efficiency of Hubei Province (Huazhong University of Science and Technology), Guangzhou 430074, China |
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| Abstract: | Short-circuit current of AC system can be affected by modular multilevel converter based high-voltage direct current(MMC-HVDC)transmission systems integrated into power grid. However, the short-circuit current contributed by the MMC has not been taken into consideration for AC protection setting calculations. From the standpoint of AC protection setting calculation, the principles of simplified analysis of MMC-HVDC are proposed. Based on the analysis of the control characteristics of MMC-HVDC system, an equivalent model of MMC-HVDC for AC protection setting calculation is established. A positive sequence current source is proposed for representing the MMC with access bus faults. Response characteristics of MMC-HVDC on the DC side with different residual voltages of fault points are studied under access bus faults for MMC-HVDC. The magnitude and phase of equivalent current source are determined and verified by simulation. Finally, a quantitative index for evaluating the influence of MMC-HVDC on AC protection setting calculation is proposed. |
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| Keywords: | modular multilevel converter(MMC) high-voltage direct current(HVDC)transmission access bus fault equivalent model response characteristics |
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