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不平衡电网故障下LVRT运行中NPC三电平光伏逆变器的中点电压分析与抑制

Neutral-Point Voltage Analysis and Suppression for NPC Three-Level Photovoltaic Converter in LVRT Operation Under Imbalanced Grid Faults With Selective Hybrid SVPWM Strategy

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中文摘要

本文深入研究了NPC三电平光伏逆变器在电网不平衡故障及低电压穿越(LVRT)期间的中点电压平衡问题。针对现有算法在复杂工况下控制失效的局限性,提出了一种选择性混合SVPWM策略,有效抑制了不平衡负载下的中点电压波动,提升了系统在极端电网条件下的运行稳定性。

English Abstract

Balanced issues of neutral-point (NP) voltage in the neutral-point-clamped (NPC) three-level photovoltaic converter have been studied in depth. Numerous algorithms for NP voltage control have been proposed and proven to be effective in normal operations. However, most of the previous studies fail to consider the effect of imbalanced loads on NP voltage, especially under low-voltage-ride-through (L...
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SunView 深度解读

该研究直接关联阳光电源组串式及集中式光伏逆变器产品线,特别是针对大型地面电站常用的NPC三电平拓扑。在电网故障(如不平衡电压跌落)期间,中点电压偏移是导致逆变器过压保护或输出电流畸变的关键痛点。本文提出的选择性混合SVPWM策略,可优化阳光电源逆变器在弱电网或复杂故障下的LVRT控制算法,提升并网电流质量和系统可靠性。建议研发团队将该算法集成至iSolarCloud智能运维平台的故障诊断模块,并优化逆变器固件,以增强产品在复杂电网环境下的适应能力。