中文说明：
主要实现并网过程中基于瞬时无功的谐波检测和无功补偿，能够很明显的看出补偿前后的电网电流波形对比图。
English Description：
It mainly realizes the harmonic detection and reactive power compensation based on instantaneous reactive power in the process of grid connection, and can clearly see the grid current waveform comparison before and after compensation.