Synchronous vector control design of multilevel inverters for AC grid applications

This article presents advanced vector control technique for a five-level cascaded H-Bridge inverter for integration of distribution generation based on renewable energy to the power grid. The presented control strategy has designed with SRF PLL and the proposed control plan is completed by setting suitable reference current components for the d and q axis in the control loop of DG, which are given based on the objectives of projected method. The objectives of control technique of DG interface system are employed to enhance the standard of power grid by injection of active and reactive current elements through integration of DG resources to the grid. In this paper an Optimized Space vector pulse width modulation (OSVPWM) control technique of five-level H-Bridge VSI has been conferred support on analysis of voltage and current elements in abc-αβ and αβ-dq special reference frames. High performance of the projection technique indicates with injection of most accessible power from renewable energy resources to power grid, this increases power factor of the grid, and reduces total harmonic distortion (THD) of grid current. The proposed control design is verified with simulations results carried using Matlab/Simulink software to carry out the different operational conditions.