弱电网下并网变流器的带阻前馈控制策略研究  

Research on Band-stop Grid-voltage Feedforward Control Strategy for Grid-connected Converter in Weak Grid Condition

作　　者：王庆红[1] 谢晓华[1] WANG Qinghong;XIE Xiaohua(Mechanical and Electrical Engineering College,Bayin Guoleng Vocational and Technical College,Korla 841001,Xinjiang,China)

机构地区：[1]巴音郭楞职业技术学院机械电气工程学院,新疆库尔勒841001

出　　处：《电气传动》2019年第5期44-48,共5页Electric Drive

基　　金：新疆自治区高校科研课题(XJEDU20161069)

摘　　要：电网电压前馈被广泛用来改善变流器的启动性能,然而,采用传统电网电压前馈时,随着感性电网阻抗的增大,系统的稳定性会迅速降低,甚至失稳。首先建立了含有感性电网阻抗和电网电压前馈时系统的数学模型,并基于阻抗分析法对变流器对弱电网的适应能力进行了分析。为了提高变流器对弱电网的适应能力,提出了基于带阻滤波的电网电压前馈策略。最后,搭建了系统仿真模型,仿真结果验证了理论分析的正确性和所提控制策略的有效性。Grid-voltage feedforward is widely used to improve the startup performance of the converter. However, the system stability is reduced quickly as the inductive grid impedance increased when the traditional grid- voltage feedforward is adopted and even the system may be unstable. First,the mathematical model of the system considering the inductive grid impedance and grid- voltage feedforward was established. In addition,the adaptive ability of the converter to the weak grid was analyzed based on the impedance criterion. In order to improve the adaptive ability of the converter to the weak grid,grid- voltage feedforward control method based on the band- stop filter was proposed. Finally,the simulation model of the system was built. The simulation results confirm the validity of the analysis and the effectiveness of the proposed strategy.

关 键 词：并网变流器 感性电网阻抗 电网电压前馈 稳定性 带阻滤波器 

分 类 号：TM46[电气工程—电器]