三相非正弦配电网的多重矢量功率理论及无功电流补偿策略

doi:10.11930/j.issn.1004-9649.202301017

摘要/Abstract

摘要： 随着配电网源网荷储的复杂性提升使电压不平衡和畸变更加严重，现有三相功率理论不能满足平衡条件并导致无功补偿效果不佳。为此，提出了三相非正弦配电网的多重矢量功率理论和无功补偿策略。利用对电压和电流的频域分解结果建立基向量并形成电压和电流矢量，并定义两矢量的几何积为多重矢量功率，并证明该理论满足功率平衡。根据多重矢量功率理论提出了以单位基波功率因数和理想谐波消除为补偿目标的2种改进补偿策略。在不同非理想电压工况下对比了不同功率理论下的7种无功分量检测算法，并选择结果较好的5种算法进行无功补偿仿真分析和实验验证。结果表明，改进单位基波功率因数法可实现流入系统的视在功率最低，从而实现传输损耗最低；改进完美谐波消除法对无功、谐波和不平衡分量的综合补偿效果最好。

关键词: 多重矢量功率, 三相不平衡和谐波, 无功补偿, 单位功率因数法, 完美谐波消除法

Abstract: The increasing complexity of distribution-level source, network, load and storage have been deteriorating voltage imbalance and distortion issues. Therefore, the traditional power theories cannot meet the conversation law and would lead to the limitation of power compensation. A Multi-vector Power Theory (MPT) based reactive current compensation strategy for three-phase non-sinusoidal distribution networks is proposed. The frequency domain decomposition results of voltage and current are employed to establish the basis vector and form the voltage and current vectors, and the geometric product of the two vectors is defined as the multi-vector power. It is proved that the multi-vector power theory meets the conservation law. Then two types of reactive current detection performance improvement strategies aiming at Unity Fundamental Power Factor (UFPF) and Perfect Harmonic Cancellation (PHC) are proposed. Comparing with 7 reactive component detection algorithms under different power theories developed by different working conditions, 5 algorithms with better results are selected to build reactive power compensation simulation models, and to design physical experiments to verify the algorithms. The results show that the UFPF on MPT achieves the lowest apparent power flowing into the system, and the PHC on MPT has the best comprehensive compensation for all non-active power, harmonics and unbalanced components.

Key words: multi-vector power theory, three-phase unbalance and harmonics, reactive power compensation, unit power factor, perfect harmonic cancellation

孙佳安, 李琳. 三相非正弦配电网的多重矢量功率理论及无功电流补偿策略[J]. 中国电力, 2023, 56(3): 109-117.

SUN Jia'an, LI Lin. A Multi-vector Power Theory Framework and Reactive Current Compensation Strategy for Three-Phase Non-sinusoidal Distribution Networks[J]. Electric Power, 2023, 56(3): 109-117.

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https://www.electricpower.com.cn/CN/Y2023/V56/I3/109

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