黎立丰;郑天文;郭岩;陈来军;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)
• 2:青海省清洁能源高效利用重点实验室(青海大学启迪新能源学院)

摘要(Abstract)：

逆变器是新能源发电系统中的重要接口装置。虚拟阻抗控制是并联逆变器谐振抑制主要方法。针对控制延时导致虚拟阻抗策略失效的问题,首先建立了考虑控制延时的并联逆变器等效电路和传递函数模型。在此基础上,定量分析了控制延时对传统虚拟阻抗相角特性的影响,揭示了虚拟阻抗在高频段呈现负阻尼而导致谐振抑制策略失效的机理。提出了基于虚拟阻抗相角补偿的并联逆变器谐振抑制方法,通过恢复虚拟阻抗在谐振频率附近的正阻尼特性,实现了并联逆变器系统的谐振抑制。进一步,采用根轨迹方法得到了保障系统稳定性的虚拟阻抗取值范围。最后,利用Matlab/Simulink软件分别对不同虚拟阻抗、电网电压暂降以及参考电流变化等多种工况进行了仿真,验证了所提控制方法的正确性和有效性。

关键词(KeyWords)： 并联逆变器;控制延时;虚拟阻抗;相角补偿;谐振抑制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51621025,51567021);; 国家电网公司科技项目(52010118000N);; 清华大学自主科研计划(20151080416)~~

作者(Author): 黎立丰;郑天文;郭岩;陈来军;梅生伟;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.0393

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