由于近些年电力电子行业的飞速发展，大量新型电力电子设备越来越多地投入到

Due to the rapid development of the power electronics industry in recent years, a large number of new power electronic devices have been increasingly put into the microgrid, which has improved the efficiency of power production and brought about power quality problems. In addition, there are many types of distributed power sources in the microgrid, and the complexity and uncertainty of its power production also seriously affect the power quality of the microgrid, thereby affecting the development and progress of the microgrid. The main power quality problems in the microgrid are voltage fluctuations, harmonics, three-phase unbalance (voltage, current), frequency fluctuations, etc. Because the microgrid contains more nonlinear loads, its harmonic problems are particularly prominent .

Due to the rapid development of power electronics industry in recent years, a large number of new power electronic equipment is increasingly invested in the microgrid, improving the efficiency of power production and bringing about the quality of power problems. In addition, the wide variety of distributed power supply in the microgrid, the complexity and uncertainty of its power production also seriously affect the power quality of the microgrid, thus affecting the development and progress of the microgrid. The main power quality problems in microgrids are voltage fluctuation, harmonic, three-phase imbalance (voltage, current, frequency fluctuation, etc.), which makes the harmonic problem especially prominent because the nonlinear load in the microgrid is more numerous.

Due to the rapid development of power electronics industry in recent years, a large number of new power electronic equipment are more and more put into the micro grid, which improves the efficiency of power production and also brings power quality problems. In addition, there are many kinds of distributed power sources in microgrid, the complexity and uncertainty of its power production also seriously affect the power quality of microgrid, thus affecting the development and progress of microgrid. The main power quality problems in microgrid are voltage fluctuation, harmonic, three-phase imbalance (voltage, current), frequency fluctuation, etc. because there are more nonlinear loads in microgrid, the harmonic problem is particularly prominent.