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一种基于MMC内部电容储能的新型故障穿越策略

A Novel Fault Ride-Through Strategy Based on Capacitor Energy Storage Inside MMC

语言:

中文摘要

针对模块化多电平换流器(MMC)直流侧短路故障,传统全桥子模块故障穿越策略虽能快速切断电流,但会导致交流侧有功功率骤降,引发电网电压与频率振荡。本文提出一种利用MMC内部电容储能的新型故障穿越策略,旨在平抑功率波动,提升系统在故障期间的稳定性。

English Abstract

Once modular multilevel converter (MMC) dc-side short-circuit fault occurs, the conventional fault ride-through (FRT) strategy indeed eliminates dc fault current quickly with the utilization of full-bridge submodules. Thereupon, ac-side active power declines sharply. However, instantaneous high power outage will cause ac-grid power and frequency oscillation and voltage instability, especially in M...
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SunView 深度解读

该研究针对MMC拓扑的故障穿越优化,对阳光电源的大型地面光伏电站及高压直流输电(HVDC)相关业务具有重要参考价值。虽然阳光电源目前主打组串式和集中式逆变器,但随着电网对构网型(GFM)技术及高压大功率并网要求的提升,MMC技术在大型储能电站及风电变流器领域的应用潜力巨大。该策略有助于提升系统在极端故障下的电网支撑能力,建议研发团队关注其在PowerTitan等大型储能系统PCS架构中的潜在应用,以增强系统在弱电网环境下的故障适应性。