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变频器母线直流电压500多伏，通过设置参数可以逆变输出220V的交流电压，它的原理是什么 是改变了直流母线的电压还是调整了逆变的频率？
直流母线电压500v逆变输出220v（380v）交流电压，主要是通过采集输出电压值与参考值比较，然后通过PID控制输出PWM驱动信号来调节和稳定交流输出的。
