模块化三相三电平低压光伏逆变器实验平台设计

Design of a Modularized Three-Phase Three-Level Low-Voltage Photovoltaic Inverter Experimental Platform

设计并搭建了一种模块化三相三电平低压光伏逆变器实验平台。实验平台包含断路器模块、直流母线电容模块、L滤波器模块、传感器模块、DSP控制板模块、三相逆变桥模块和隔离电源模块。光伏逆变器直流侧连接实验室建筑顶部的小型光伏阵列,交流电网通过变压器降压,能够保证实验过程的安全性。该实验平台能够完成电网电压锁相(PLL)、三电平空间电压矢量调制(SVPWM)、并网、最大功率跟踪(MPPT)等实验。

In order to coordinate with photovoltaic-power-generation courses, a modularized three-phase three-level low-voltage photovoltaic inverter experimental platform is developed.The experimental platform includes a circuit breaker module, DC-link capacitor module, L-filter module, sensor module, DSP control board module, three-phase inverter bridge module, and isolated power supply module. The DC side of the photovoltaic inverter is connected to alow-power photovoltaic array on the top of the laboratory building, and the grid voltage is reduced by a step-down transformer to ensure the safety of the experiment process. This experimental platform can achieve the experiments of phase locked loop(PLL), three-level space vector pulse width modulation(SVPWM), grid connection, maximum power point tracking(MPPT), etc.