Performance Analysis of Multi-objective Control for Multi-level Grid Tied Inverter based Distributed Generation

Abstract

Renewable energy sources (RES) are becoming quite popular for usage as distributed generator. Distributed generation (DG) sources especially photo voltaic are connected with grid via power electronic converter are also termed as grid tied inverter (GTI). GTI along with active power exchange with the grid can also be controlled to exchange reactive power, voltage compensation and harmonic mitigation. To add multifunctional to the inverter appropriate control strategies are used. Here, three-phase damping as well as CPQE based control strategies are analyzed for multi functional GCI (MFGCI). The Comprehensive power quality evaluation based control algorithm is used to utilize the minimum capacity of multifunctional grid connected inverter (MFGCI), enhance the power quality of MFGCI, to provide the reactive power compensation and harmonic mitigation. Here, this proposed technique is implemented for two level as well as three level MFGCI. MATLAB based simulation analysis is carried out for CPQE controlled MFGCI. Also, to check the versatile behaviour of proposed MFGCI, performance of three levels MFGCI is analysed for three-phase damping control strategy. The proposed MFGCI is controlled using space vector current controller. Effective active power exchange of the SVM controlled CPQE as well as three-phase damping strategy based MFGCI is presented through MATLAB based simulation analysis. Satisfactory performance of the proposed MFGCI for voltage compensation during fault condition is also presented.