Inverter,as an important part of photovoltaic power generation system,the structure selection and design of which is very essential.Aiming at the limitations of traditional inverter,after analyzing the topological structure and work principle of Z-source inverter,a new Z-source inverter topology is proposed,and a kind of new photovoltaic power generation system based on new Z-source inverter is designed.The system uses high-performance DSP as main control chip,develops a kind of double closed loop control scheme with adding shoot-through zero vector,and adopts a maximum power point tracking (MPPT) control method that combines disturbance observation method and least square method,which achieved a perfect and safe performance.%逆变器是光伏发电系统的重要组成部分,逆变器结构的选择与设计至关重要.文章从传统逆变器局限性入手,在重点分析了Z源逆变器的拓扑结构和工作原理基础上,提出新型Z源逆变器的拓扑结构,并设计了一种基于新型Z源逆变器的光伏并网发电系统.系统采用高性能DSP作为主控制芯片,研究了一种加入直通零矢量的双闭环控制方案,采用扰动观测法与最小二乘法相结合的最大功率点跟踪(MPPT)控制方法,使整个系统更加完善、安全.
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