| 动态电压恢复器电压跌落检测 |
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| 引用本文： | 杨新华,郭志成.动态电压恢复器电压跌落检测[J].低压电器,2011(5):51-54. |
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| 作者姓名： | 杨新华 郭志成 |
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| 作者单位： | 兰州理工大学电气工程与信息工程学院;甘肃省工业过程先进控制重点实验室; |
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| 摘 要： | 动态电压恢复器中常用d-q变换法实时检测电压跌落,但是它的检测精度和实时性易受到三相不平衡情况下负序分量和低通滤波器的影响。提出一种改进的检测方法,首先对三相电压进行微分运算,构造线性方程组实现电网电压中的正、负序分量分离,再对正序分量进行d-q变换,消除负序分量的干扰,最后使用高截止频率低通滤波器滤除其他频次干扰,减少系统延时。理论分析和仿真试验都验证了其可行性。
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| 关 键 词： | 动态电压恢复器 d-q变换 电压跌落 三相不对称 |
Voltage Sag Detection in Dynamic Voltage Restorer |
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| YANG Xinhua,GUO Zhicheng.Voltage Sag Detection in Dynamic Voltage Restorer[J].Low Voltage Apparatus,2011(5):51-54. |
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| Authors: | YANG Xinhua GUO Zhicheng |
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| Affiliation: | YANG Xinhua1,2,GUO Zhicheng1(1.College of Electric and Information Engineering,Lanzhou University.of Technology,Lanzhou 730050,China,2.Key Laboratory of Gansu Advanced Control for Industral Processes,China) |
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| Abstract: | In dynamic voltage restorer,d-q transform method was commonly used for detecting voltage sag in real-time,but its accuracy and real-time was impacted by negative sequence component and low-pass filter.An improved detection method was presented.Firstly,by means of solving the linear equations that were gained by differentiating the sampled three-phase grid voltage,it was able to separate negative sequence component from grid voltage,and then positive sequence component was transformed by d-q transform to eli... |
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| Keywords: | dynamic voltage restorer(DVR) d-q transform voltage sag three-phase imbalance |
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