雷金勇;葛俊;谈赢杰;帅智康;胡洋;肖敏;

• 1:南方电网科学研究院有限责任公司
• 2:国家电能变换与控制工程技术研究中心(湖南大学)

摘要(Abstract)：

当电网发生不对称故障时,并网逆变器自身限流控制及支撑故障电网的能力决定了系统运行的可靠性。为解决该问题,首先,对三相四线制并网系统中瞬时功率关系进行分析,获得以功率波动抑制为目标的三相四桥臂逆变器进网电流各序分量的参考表达式。然后,通过与不同的电压跌落深度和功率因数进行对比,得出中线电流为最大相电流幅值的重要结论,并给出三相四桥臂逆变器能提供的最大有功和无功功率。在此基础上,提出了基于最大相电流约束和改进无功注入曲线的三相四桥臂逆变器不对称故障穿越策略,在满足并网逆变器自身安全情况下优先注入定量无功功率,从而实现了对故障电网电压的有效支撑。最后对传统方法及文中所提方法进行了对比仿真研究,结果验证了提出方法的可行性和有效性。

关键词(KeyWords)： 不对称故障;三相四桥臂逆变器;限流控制;改进无功注入曲线;电网电压支撑;功率波动抑制

Abstract:

Keywords:

基金项目(Foundation): 南方电网公司科技项目(ZBKJXM20180211)~~

作者(Author): 雷金勇;葛俊;谈赢杰;帅智康;胡洋;肖敏;

Email:

DOI: 10.13335/j.1000-3673.pst.2019.0787

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