The advantage of solar power generation is that solar energy resources will never be exhausted, with zero emissions and a flexible layout of scales. Solar inverter is a kind of power electronic equipment that connects solar photovoltaic panels and the power grid. It first converts direct current into direct current to realize the maximum power tracking control function of solar energy, and then converts direct current into alternating current. By the number of AC output phases, it can be classified into single-phase inverters and three-phase inverters. By electrical isolation, it can be classified into the isolated type and non-isolated type. According to the characteristics of inverters, a single-phase series inverter is selected for 220V projects, a three-phase series inverter is selected for 8KW-30KW projects, and a series inverter or centralized inverter can be selected for projects above 50KW according to the actual situation.
Traditional PV inverters must be matched with an isolation transformer, which usually reduces the efficiency by 2%. The new photovoltaic inverter adopts non-isolated inductance, featuring high power generation, high efficiency, small size and lightweight.
The SiC MOSFET and diode developed by APS will be an important force to promote inductor miniaturization with high frequency and low loss.
Solar energy is almost unlimited and can be used in most places. It is the most environmentally friendly energy. The standard PV power conversion system has an isolated or non-isolated first-stage DC-DC converter and a second-stage DC-AC inverter for AC output. In order to meet the safety requirements of the United States, it is usually necessary to isolate PV cells from AC outputs. In Europe and Japan, many inverters are designed with non-isolated topology, which can reduce weight, improve efficiency and reduce cost, but they also need a grounding loop. Protect the circuit from accidental electric shock. For commercial and industrial applications, the typical three-phase power is 10 to 100 kW, which can be served by APS SiC diode and MOSFET solutions.