基于STC15F2K60S2单片机的微电网模拟系统设计

文章研究的微电网实验模拟系统以STC15F2K60S2单片机为控制核心,由三相逆变器、滤波电路、电压电流检测电路等电路构成,利用自然数查表法在单片机输出SPWM脉冲信号,采用双极性调制驱动三相全桥逆变电路,实现了在三相对称Y型连接的电阻负载上得到稳定的正弦波交流电的功能。测试表明该微电网模拟系统输出电流、输出电压和频率,满足负载线电流、线电压以及工频的相关要求,且交流母线电压总谐波畸变率少于2%、逆变器的运行效率高于85%。该系统可以通过按键设置控制微电网系统中两个逆变器的并网操作或独立运行,具有操作容易、维护简单、造价便宜的优点,易于推广。

The micro grid experiment simulation system,use STC15 F2 K60 S2 as the control core, composed of threephase inverter, filter circuit, voltage and current detection circuit and so on. The SPWM pulse signal is output in the single-chip microcomputer by using natural number look-up table method, and the three-phase full bridge inverter circuit is driven by bipolar modulation. The stable sine wave cross is achieved on the resistance load of three-phase symmetrical Y-type connection the function of streaming electricity. The test results show that the output current,output voltage and frequency of the micro grid simulation system meet the requirements of load line current, line voltage and power frequency, and the total harmonic distortion rate of the AC bus voltage is less than 2%, and the operation efficiency of the inverter is higher than 85%. The system can also control the grid connection operation or independent operation of the two inverters in the micro grid system through the key setting, with the operation capacity.The advantages of easy, simple maintenance and low cost are easy to promote.

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