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基于无源性的改进型LCL滤波器并联逆变器零序LC谐振抑制方法

Passivity-Based Zero-Sequence LC Resonance Suppression Method for Parallel Inverters System With Modified LCL Filter

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中文摘要

针对改进型LCL滤波器并联逆变器系统中的零序LC(ZSLC)谐振问题,本文提出了一种基于无源性的抑制方法。在低开关频率应用场景下,传统逆变器侧环流反馈控制因控制延迟导致稳定性下降,该方法有效解决了这一难题,提升了高功率并联系统的并网稳定性。

English Abstract

Parallel inverters system with modified LCL filters may trigger zero-sequence LC (ZSLC) resonances. Especially in high-power applications, lower switching frequencies are usually adopted to reduce switching losses. In this situation, conventional inverter-side circulating current feedback (ICCF) control cannot behave as expected and introduces new stability issues due to high control delays. To de...
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SunView 深度解读

该研究直接针对阳光电源核心的组串式逆变器及大功率储能变流器(PowerTitan系列)并联运行场景。在大型地面光伏电站和电网侧储能项目中,多机并联带来的零序谐振是影响系统稳定性的关键痛点。该无源性控制策略能有效解决低开关频率下的谐振抑制问题,提升系统在弱电网环境下的鲁棒性。建议研发团队将其引入iSolarCloud智能运维平台的故障诊断算法中,并优化大功率PCS的控制固件,以提升产品在复杂电网环境下的并网性能。