| 引用本文: | 刘宇峰,吴学智,刘京斗,李晓亮,朱桂棠.考虑跌落时相角对幅值特性影响的电压暂降判断方法[J].电力自动化设备,2021,41(3): |
| LIU Yufeng,WU Xuezhi,LIU Jingdou,LI Xiaoliang,ZHU Guitang.Voltage sag judgment method considering influence of phase angle on amplitude characteristics during sag[J].Electric Power Automation Equipment,2021,41(3): |
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| 摘要: |
| 实现电压暂降补偿的关键是快速、准确地判断暂降事件的发生。对已有的延迟小角度检测法存在的问题进行分析，提出了一种改进的电压暂降判断方法。该方法在延迟小角度构造αβ坐标系的基础上，分析了暂降时刻dq坐标系下的电压特性，并推导出含有幅值信息的d轴分量的表达式，通过预测暂降时刻该分量的变化趋势和大小，可快速地判断电压暂降。所提方法可以克服延迟小角度检测法中幅值波动对检测的影响，提高检测速度，有利于后续补偿效果。仿真结果证明所提方法可以有效改善检测的实时性和准确性。 |
| 关键词: 电压暂降 检测 延迟小角度 电压特性 变化趋势预测 |
| DOI：10.16081/j.epae.202102018 |
| 分类号:TM714.2 |
| 基金项目: |
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| Voltage sag judgment method considering influence of phase angle on amplitude characteristics during sag |
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LIU Yufeng1, WU Xuezhi1,2, LIU Jingdou1, LI Xiaoliang3, ZHU Guitang3
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1.National Active Distribution Network Technology Research Center (NANTEC),Beijing Jiaotong University, Beijing 100044, China;2.Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100044, China;3.Beijing Xinghang Mechanical and Electrical Equipment Co.,Ltd.,Beijing 100074, China
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| Abstract: |
| The key to realize voltage sag compensation is to judge the occurrence of sag events quickly and accurately. The problems of existing small angle delay detection method are analyzed, and an improved voltage sag judgment method is proposed. Based on the construction of αβ coordinate system with small angle delay, the voltage characteristics of dq coordinate system at the time of sag are analyzed, and the expression of d axis component with amplitude information is derived. By predicting the change trend and magnitude of d axis component at the time of sag, the voltage sag can be quickly determined. The proposed method can overcome the influence of amplitude fluctuation in small angle delay detection method, improve the detection speed, and is conducive to the follow-up compensation effect. Simulative results verify that the proposed method can effectively improve the real-time performance and accuracy of detection. |
| Key words: voltage sag detection small angle delay voltage characteristics change trend prediction |
