讨论了一种用于辅助电力电子技术理论教学的光伏发电系统实验演示装置的研制，重点分析了中点钳位三电平光伏逆变器的设计。该逆变电路通过SPWM控制方法，将直流电压转换成负载所需的交流电压，具有谐波少、效率高等一系列优点。基于光伏发电实验演示装置通过模块化的形式，将光伏发电的过程清晰地呈现出来，同时通过改变光伏板的倾斜程度可以完成各种演示实验，使理论教学过程更直观，更富有活力。%This paper discusses the development of an experimental demonstration device for the power electronic technology theory teaching, focusing on the design of the neutral point clamped three level photovoltaic inverter. The inverter circuit through the SPWM control method, the DC voltage is converted into the AC voltage required to load, with a series of advantages of low harmonic and high efifciency. Based on the discussion of photovoltaic power generation experimental demonstration device through the modular form, the process of photovoltaic power generation is clear, and the degree of tilt of the PV panels can be completed by various experiments, the theory teaching process is more intuitive, more dynamic.
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