Direct Power Control for various topologies of three phase grid-connected Voltage Sources Converters using Sliding Mode Control
This paper presents a new approach to Direct Power Control (DPC) strategy using Space Vector Modulation (SVM) for the three-phase grid connected Voltage Source Converter (VSC) in the Renewable Energy Sources (RESs). The proposed DPC strategy is based on the Sliding Mode Control (SMC) and it is implemented in the dq reference frame. The active and reactive powers are directly controlled by VSC switching states selection based on the instantaneous value of the delivered power error. This strategy may be implemented to various VSC topologies. Moreover, linear controllers and modulators are not necessary. The aim of the control strategy is to inject maximal available active power and a controlled amount of reactive power into grid. The strategy is tested on a simulation model of a multilevel VSC (ML-VSC). Simulation results of the tested VSC topology and harmonic analysis of the output signals are presented at the end.