| 三相电压不对称时谐波和无功电流的准确检测 |
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| 引用本文： | 马大铭,朱东起,高景德.三相电压不对称时谐波和无功电流的准确检测[J].清华大学学报(自然科学版),1997(4). |
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| 作者姓名： | 马大铭 朱东起 高景德 |
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| 作者单位： | 清华大学电机工程与应用电子技术系 |
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| 基金项目： | 国家科委攀登计划（B）项目 |
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| 摘 要： | 讨论了三相电网电压不对称情况下对非线性负荷合理的补偿方案，对基于“瞬时无功功率理论”的谐波检测方法所存在的不足进行了分析，继而提出了一种新的基波无功和高次谐波电流检测方法。由于采用了双闭环方式，使得在三相电压不对称并含有高次谐波的情况下，也可以对基波无功和高次谐波电流进行准确的检测，检测精度受元件参数变化影响小，具有较强的适应性。另外，按照功率平衡的原理，对补偿电流进行了修正。仿真分析对该方法的正确性和可行性进行了证明。
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| 关 键 词： | 不对称电压 基波无功电流 高次谐波 检测 |
Accurate detection for harmonics and reactive currents in the case of unsymmetrical three phase voltages |
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| Ma Daming,Zhu Dongqi,Gao Jingde.Accurate detection for harmonics and reactive currents in the case of unsymmetrical three phase voltages[J].Journal of Tsinghua University(Science and Technology),1997(4). |
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| Authors: | Ma Daming Zhu Dongqi Gao Jingde |
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| Institution: | Ma Daming,Zhu Dongqi,Gao Jingde Department of Electrical Engineering,Tsinghua University,Beijing 100084 |
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| Abstract: | The proper compensation method for nonlinear loads in the case of unsymmetrical threephase voltages is discussed. Limitations of the detecting method based on the theory of instantaneous reactive power for harmonics and reactive currents are analyzed, then a novel detecting method is presented. Due to the use of double close loop control in this method, the fundamental reactive current and high frequency harmonics also can be detected accurately when three phase voltages are unsymmetrical. The changes of circuit parameters only have small influence on the accuracy of the detecting system. According to the power equation, the compensating current is modified. Simulations are carried out to verify the feasibility and correctness of this method. |
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| Keywords: | unsymmetrical voltages fundmental reactive current high frequency harmonics detection |
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