Fuzzy self-adaptive sliding-mode control method of single-phase photovoltaic grid-connected inverter

The invention discloses a fuzzy self-adaptive sliding-mode control method of a single-phase photovoltaic grid-connected inverter. The fuzzy self-adaptive sliding-mode control method is characterized by comprising the following steps of 1, building a photovoltaic inverter mathematical model considering system structural parameter uncertainty and an external disturbance item; 2, designing a sliding-mode controller; 3, designing a fuzzy self-adaptive sliding-mode controller; and 4, controlling a photovoltaic system according to output of the sliding-mode controller and the fuzzy self-adaptive sliding-mode controller. By the fuzzy self-adaptive sliding-mode control method, an accurate mathematical model of the photovoltaic system is not needed to build, a controlled objected is approached by fuzzy self-adaptive control, so that the system structural parameter uncertainty and the external disturbance item are considered; the control rate is designed according to voltage deviation by sliding-mode control, so that control has robustness, and the requirements of stability and robustness can be met; and when a system environment is abruptly changed, a control algorithm can reliably work, and the single-phase photovoltaic system outputs stable sine AC voltage.