| 一种考虑频率偏差的谐波电流检测方法 |
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| 引用本文： | 杨胜跃,吴敏,黄深喜,樊晓平. 一种考虑频率偏差的谐波电流检测方法[J]. 电力系统自动化, 2012, 36(7): 57-61 |
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| 作者姓名： | 杨胜跃 吴敏 黄深喜 樊晓平 |
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| 作者单位： | 1. 中南大学信息科学与工程学院,湖南省长沙市,410075
2. 中南大学信息科学与工程学院,湖南省长沙市410075／威胜仪表集团长沙威胜信息技术有限公司,湖南省长沙市410013 |
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| 摘 要： | 针对目前的无锁相环谐波检测方法在电网电压畸变和频率偏移时对谐波检测精度变差的问题,提出了一种基于瞬时无功功率理论的改进谐波检测方法。该方法能在电网含有负序分量、谐波且频率偏移时由电压基波矢量快速、准确地测定电压的频率和相位,为电网不平衡状态下谐波的检测和治理提供可靠的信息。理论推导和仿真结果表明,所提出的改进方法能有效改善电网频率偏移和电压畸变时谐波电流的检测精度。
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| 关 键 词： | 谐波检测 瞬时无功功率理论 锁相环 频率偏移 电压畸变 |
| 收稿时间： | 2011-04-15 |
| 修稿时间： | 2012-03-14 |
A Harmonic Current Detection Method Considering Frequency Shift |
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| YANG Shengyue,WU Min,HUANG Shenxi,FAN Xiaoping. A Harmonic Current Detection Method Considering Frequency Shift[J]. Automation of Electric Power Systems, 2012, 36(7): 57-61 |
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| Authors: | YANG Shengyue WU Min HUANG Shenxi FAN Xiaoping |
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| Affiliation: | 1 (1.School of Information Science and Engineering,Central South University,Changsha 410075,China;2.Changsha Willfar Information Technology Co.Ltd.,Wasion Meter Group,Changsha 410013,China) |
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| Abstract: | In order to implement real-time detection of harmonic currents with the system voltage distortion and frequency shift,a method for any harmonic current detection based on the instantaneous reactive power theory is presented.This method can get the grid’s real-time frequency information when the grid contains harmonics or negative sequence currents.The theoretical analysis and simulation results show that the algorithm can improve detection precision effectively,and the detection performances are not affected by the frequency shift and distorted voltage. |
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| Keywords: | harmonic detection instantaneous reactive power theory phase lock loop frequency shift voltage distortion |
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