王康平,智远,葛鹏江,吕金历
WANG Kangping,ZHI Yuan,GE Pengjiang,LYU Jinli

• 1:国家电网有限公司西北分部

摘要(Abstract)：

随着大量非线性负荷与电力电子设备接入电力系统，PCC（公共连接点）电压畸变问题日益突出，严重影响电能质量与并网设备的安全稳定运行。构网型变流器作为新能源并网的关键设备，提升其谐波治理能力具有重要意义。为此，通过建立基于双PI（比例-积分）控制的构网型变流器谐波阻抗模型，定量表征其在不同频率下的谐波电压抑制特性。在此基础上，提出可灵活调节的谐波阻抗重塑策略，在兼顾变流器谐波电流注入能力约束的同时，通过调节其等效阻抗，实现在谐波电压抑制与电流约束之间的折中优化。理论分析与实验结果均表明，该策略可有效抑制PCC的谐波电压，并对线路谐波电流进行协同控制，从而显著提升系统的谐波治理性能。该策略无需增设额外控制环路，即能实现谐波电压与电流的灵活抑制，提升了电能质量与系统运行的可靠性。
With the large-scale integration of nonlinear loads and power electronic equipment into power systems, voltage distortion at the point of common coupling(PCC) has become increasingly prominent, severely affecting power quality and the safe and stable operation of grid-connected equipment. As a key interface device for renewable energy integration, enhancing the harmonic mitigation capability of grid-forming converters is of great significance. To this end, a harmonic impedance model of a grid-forming converter based on dual proportional–integral(PI) control is established to quantitatively characterize its harmonic voltage suppression characteristics over different frequency ranges. On this basis, a flexibly adjustable harmonic impedance reshaping strategy is proposed. By regulating the equivalent impedance of the converter while respecting constraints on its harmonic current injection capability, a trade-off optimization between harmonic voltage suppression and current limitation is achieved. Both theoretical analysis and experimental results demonstrate that the proposed strategy can effectively suppress harmonic voltages at the PCC and coordinately control line harmonic currents, thereby significantly improving the overall harmonic mitigation performance of the system. The strategy achieves flexible suppression of both harmonic voltage and current without introducing additional control loops, enhancing power quality and system operating reliability.

关键词(KeyWords)： 非线性负荷;谐波电压;构网型变流器;阻抗重塑;电流质量
nonlinear loads;harmonic voltage;grid-forming converters;impedance reshaping;current quality

Abstract:

Keywords:

基金项目(Foundation): 智能电网国家科技重大专项（2024ZD0800200）

作者(Author): 王康平,智远,葛鹏江,吕金历
WANG Kangping,ZHI Yuan,GE Pengjiang,LYU Jinli

DOI: 10.19585/j.zjdl.202605010

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