陈天一;陈来军;郑天文;梅生伟;

• 1:电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系)

摘要(Abstract)：

虚拟同步发电机(virtual synchronous generator,VSG)可实现分布式电源友好并网。然而,传统的VSG控制不具备低电压穿越能力,在电网电压暂降时难以提供无功支撑,且容易发生输出电流幅值越限。为此,提出一种基于模式平滑切换的VSG低电压穿越控制方法。首先结合传统低电压穿越控制的数学模型,分析了其与VSG平衡电流控制之间的关联以及两者在切换时存在的问题;在此基础上,设计了VSG低电压穿越控制的整体方案,利用VSG平衡电流控制无差跟随的特点实现了控制模式的平滑切换,使得VSG在电压跌落过程中,其控制信号可很好地跟随电流指令参考值。该方法能够避免故障恢复时由于控制模式突变造成的暂态电流冲击,实现VSG在不同工况下的低电压穿越。仿真结果验证了所提方法的正确性和有效性。

关键词(KeyWords)： 虚拟同步发电机;低电压穿越;模式平滑切换;状态跟随

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金创新研究群体项目(51321005);国家自然科学基金资助项目(51567021)~~

作者(Author): 陈天一;陈来军;郑天文;梅生伟;

Email:

DOI: 10.13335/j.1000-3673.pst.2016.07.030

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