The invention discloses a method of selecting an
inverter sliding mode controller coefficient. The method is characterized by firstly, establishing a
phase variable model of a
full bridge inverter; and then combining a sliding mode controlling principle and an
inverter work principle to construct a switching function s and selecting a
sliding mode control law uc; and combining an existence condition and an
accessibility condition of a sliding mode to deduce the existence condition of the sliding mode and a boundary value calculating formula of the sliding mode; and finally determining a
hysteresis band width. In the invention, according to an expected design index and a main circuit known parameter, the formula can be directly used to calculate a needed sliding mode coefficient; a sliding mode controller coefficient formula design method is simple and easy to operate; because a maximum overshoot is determined to be a sliding mode domain positive boundary, when a zero load is changed into a full load, the designed sliding mode coefficient can guarantee
rapidity and robustness of an inversion
system response. By using the method in the invention, a problem that the sliding mode coefficient can not be accurately selected is solved and connection is directly established with an inverter expectation
performance index.