Distributed Photovoltaic Inverter Multi-modal Sliding Mode Control Method and Simulation Analysis

As the core component of distributed photovoltaic( PV) system,the existing inverter has deficiencies of simple function and inadequate performance. Inverters performance improvement is of great significance to the promotion of distributed PV system. To perfect inverters function,control strategies for inverter under different operation modes were designed according to different objectives based on the typical structure of distributed PV system. Sliding mode control scheme was adopted to guarantee the systems dynamic performance. Sliding mode current/voltage control scheme was proposed based on the grid-tied/stand-alone mathematic model of inverter. Control strategies simulation for inverter under different operating modes were carried out in the MATLAB/SIMULINK. The results show that the proposed control strategy can realize corresponding control target under different operating modes and ensure the output power quality. At the same time,inverters dynamic and anti-jamming performance is perfect.