电工技术学报  2022, Vol. 37 Issue (3): 634-644    DOI: 10.19595/j.cnki.1000-6753.tces.201672
电力系统与综合能源 |
考虑并网运行微电网故障方向识别的逆变型分布式电源故障控制
朱吉然1, 牟龙华1, 郭文明2
1.同济大学电子与信息工程学院 上海 201804;
2.长沙学院电子信息与电气工程学院 长沙 410022
Fault Control of Inverter Interfaced Distributed Generator Considering Fault Direction Identification of the Grid-Connected Microgrid
Zhu Jiran1, Mu Longhua1, Guo Wenming2
1. College of Electronics and Information Engineering Tongji University Shanghai 201804 China;
2. College of Electronic Communication and Electrical Engineering Changsha University Changsha 410022 China
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摘要 微电网具有双向故障电流,其保护的一个关键问题是如何准确判别故障方向。对微电网正序故障附加网络的分析表明,逆变型分布式电源(IIDG)正序故障分量阻抗角所在象限决定了正序故障分量方向元件在并网运行微电网中的适用性。然而,IIDG功率输出策略的多样性和故障后IIDG并网点电压变化的不确定性导致IIDG正序故障分量阻抗角所在象限无法确定。对此,该文提出一种多阶段的IIDG故障控制方法,通过改变IIDG在特定时间窗口内的故障响应特性将其正序故障分量阻抗角控制为给定值,从而在微电网中构造出不依赖于IIDG功率输出策略的正序故障分量特征。基于Simulink的仿真结果验证了采用所提出IIDG故障控制方法时微电网故障方向识别的准确性。
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关键词 并网运行微电网故障方向逆变型分布式电源正序故障分量    
Abstract:The microgrid fault current is bidirectional, and a key issue of its protection is how to determine the fault direction. The analysis of positive-sequence additional network of microgrid shows that the applicability of the positive-sequence fault component (PFSC) based directional element in gird-connected microgrid is decided by the quadrant of the PSFC impedance angle of inverter interfaced distributed generator (IIDG). However, due to the diversity of IIDG power output strategy and the uncertainty of voltage variation at the IIDG coupling point, the quadrant of PSFC impedance angle of IIDG cannot be determined. In this regard, this paper proposed a multi-stage IIDG fault control method. By manipulating the fault response characteristic of IIDG in a specific time window, the PSFC impedance angle was controlled to a given value, so as to construct a PSFC feature independent of IIDG power output strategy in microgrid. The Simulink simulation results verified the accuracy of the microgrid fault direction identification by adopting the proposed IIDG fault control method.
Key wordsGrid-connected microgrid    fault direction    inverter interfaced distributed generator    positive-sequence fault component   
收稿日期: 2020-12-23     
PACS: TM77  
基金资助:中央高校基本科研业务费用专项(22120210164)和国家电网公司总部科技项目(5216A019000R)资助
通讯作者: 牟龙华 男,1963年生,教授,博士生导师,研究方向为电力系统保护与控制。E-mail:lhmu@tongji.edu.cn   
作者简介: 朱吉然 男,1985年生,博士研究生,高级工程师,研究方向为配电自动化、信息化和智能配电网设备。E-mail:zhujiran040356@163.com
引用本文:   
朱吉然, 牟龙华, 郭文明. 考虑并网运行微电网故障方向识别的逆变型分布式电源故障控制[J]. 电工技术学报, 2022, 37(3): 634-644. Zhu Jiran, Mu Longhua, Guo Wenming. Fault Control of Inverter Interfaced Distributed Generator Considering Fault Direction Identification of the Grid-Connected Microgrid. Transactions of China Electrotechnical Society, 2022, 37(3): 634-644.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.201672          https://dgjsxb.ces-transaction.com/CN/Y2022/V37/I3/634