使用扰动观察法实现最大功率跟踪，使用电容电压外环，电感电流内环实现单位功率因数的并网逆变器双环控制。(The method of disturbance observation is used to realize the maximum power tracking, the outer loop of capacitor voltage and the inner loop of inductor current are used to realize the double loop control of grid connected inverter with unit power factor.)