Power Controller Effects for Mitigating Harmonics in a Three-Phase Grid-Connected Inverter

Proportional active and reactive power delivered into the grid systems is capable to enhance power quality and harmonic mitigation. It is a promising solution for Distributed Generations (DG) for grid power compensation. Conventional Current Control Mode (CCM) strategy has a limitation to achieve grid power compensation with various load changes. While Voltage Control Mode (VCM) may regulate voltage and current based on the dq-component of current and voltage, both strategies show poor performance to generate the proportional active and reactive current when they are applied to the DG systems. Considering this problem, this paper proposes Power Control Mode (PCM) strategy in combination with CCM and VCM to improve the performance of the DG systems, by compensating for the distorted grid current and improving power quality. In this strategy, by using dynamic active and reactive power injection, harmonic mitigation can be enhanced. In order to verify the effectiveness of the proposed strategy, this paper presents the results of simulation work and comparative analysis against other strategies.