Design of Power Quality Monitoring System for Distributed Photovoltaic Power Station

With the large-scale use of photovoltaic power station, the power quality problem caused by grid-connected photovoltaic power station has become a research hotspot. The power monitoring device of distributed photovoltaic power station has the function of monitoring the power before grid connection. It can monitor the power quality parameters, analyze the data, and transmit the real-time monitoring results to the client. Firstly, the calculation of power parameters is described, which mainly describes the concepts of power supply voltage deviation, voltage / current effective value, power system frequency deviation, voltage fluctuation and flicker, and power harmonics. Then the hardware structure and function of the device are described. Finally, the core device TMS320F28335 is selected, and some auxiliary peripheral circuits are designed to form a complete hardware monitoring system.