DC circuit breaker is an important part of grid-connected photovoltaic power generation system

The trait of the grid photovoltaic power generation system is solar battery components produced by direct current through the grid inverter converted to meet the requirements of the mains grid after alternating current (ac) and direct people to the public power grid, the grid system, generate electricity by solar photovoltaic phalanx in addition to the supply system of ac load, extra power back to the grid. In rainy days or at night, when the solar cell module does not produce electric energy or the generated electric energy cannot meet the load demand, the power grid will supply power to the load in the system. The grid-connected photovoltaic power generation system directly inputs the electric energy into the grid, eliminates the storage and release process of the battery, and can make full use of the electric energy generated by the photovoltaic cell array, thus reducing the energy loss and reducing the cost of the system. However, a dedicated grid-connected inverter is needed in the system to ensure that the output power meets the requirements of voltage, frequency and other electrical performance indicators of the grid. Because of the efficiency of the inverter, there will still be some energy loss. Such systems can often use both mains and solar photovoltaic systems in parallel to power local AC loads, reducing the overall system load loss rate and acting as peak adjusters for utility grids. However, as a distributed power generation system, grid-connected photovoltaic power generation system will have some adverse effects on the traditional centralized power supply system, such as harmonic pollution, island effect and so on.