该源码主要是用于检测电网中电压信号的频率和相位信息，在光伏并网中必须要将信号的频率和相位分别调至50HZ，相位必须同相才能保证能够安全地输入电网，此程序能够跟踪逆变电压的相位频率信息，方便接入-The main source of information for the frequency and phase detection grid voltage signal must be in the photovoltaic grid frequency and phase signals were raised To 50HZ, must ensure the same phase to phase input power can safely be able to track this program phase inverter voltage frequency information, easy access