Z源逆变器光伏并网控制策略研究  

Study of the Control Strategy for the Photovoltaic Grid-connected Generation System Based on Z Source Inverter

作　　者：张先飞[1] 郑建勇[1] 胡敏强[1] 

机构地区：[1]东南大学电气工程学院,江苏南京210096

出　　处：《电气传动》2009年第10期8-13,共6页Electric Drive

基　　金：863项目(2008AA052421)

摘　　要：Z源变换器因其具有的诸多优点,成为当今研究的热点。首先对基于Z源变换器光伏并网发电系统的工作原理进行了分析,建立了平均状态模型;在此基础上设计了相应的控制器,其特点为:针对系统各部分时域响应特点实现了系统解耦控制,实现了最大功率跟踪与同步并网的要求;采用新的Z源升压控制方案,以适应光伏电池输入电压变化范围较大的特点;采用新型功率扰动的最大功率跟踪方案,保证了并网电流的稳定性。实验仿真证明了控制器的有效性。The Z source converter system has been the focus of the research because of the inherent advantages. The theory of the photovoltaic（PV） grid-connected generation system based on Z source converter was discussed and the space state average model was built. The controller has the features as follows：The demands of maximum power point track（MPPT） and the low harmonic current poured into grid are realized simultaneously with the decoupling control based on the different time response of the whole system; A new method is proposed to boost the voltage through Z impedance network. This method can accommodate the variety of the photovoltaic voltage; A new perturbation and observation （P＆O） based on the power is investigated to guaranty the stability of the whole control system. The experiment with the simulink tool is carried on to improve the feasibility of the proposed control strategy.

关 键 词：Z源逆变器 光伏发电 最大功率点跟踪 

分 类 号：TM464[电气工程—电器]