This paper proposes a novel control method to effectively reduce the low-order harmonics contained in the grid current. When different kinds of loads or non-linear loads are connected to the Point of Common Coupling(PCC), harmonics are generated in the grid voltage, which causes output current distortion of inverter. This current distortion causes reduced efficiency and resonance of the power converter. In general, to reduce the current distortion, a low-order harmonic cancellation technique is used using proportional-integral control and low-pass filter. This method cannot effectively remove the harmonic component of the grid current due to the effect of the fundamental wave. In this paper, an effective harmonic control method is proposed, in which the effects by fundamental wave components have been removed. Simulation and experimental results verify the effectiveness and validity of proposed method.
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy (MOTIE) (Human Resources Program in Energy Technology, No. 20194030202370, Demonstration and Development of ESS Solution Connected with Renewable Energy against with the wheather condition of Middle East Region, No. 20182410105160).
