1. Common new or renewable energy sources, such as wind energy and solar energy, are all primary energy sources. To use them efficiently on a large scale, converting them into electric energy is one of the most effective ways so far, such as wind power generation and solar photovoltaic power generation.

2. Because of the instability of new energy power generation, such as solar energy is affected by regional differences and wind energy is affected by seasonal differences, it is necessary to equip energy storage devices and combine different types of new energy power generation methods for complementary power generation.

3. The power generated by new energy is generally difficult to be directly integrated into the power grid or supplied to the load due to the differences in voltage level, frequency value and AC and DC, and power power electronics technology has played an important role at this time.