Power Quality Improvement in Grid Connected System with Fuzzy Logic Controller At Distribution Level

Abstract

The depletion of the fossil fuel resources and the global warming effects has led the world to think seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to the distribution systems, mostly done by using power electronic converters. But use of power electronic converters and non-linear loads like at distribution level injects harmonics, which intern cause power quality problems. Distribution static compensator (DSTATCOM) is very popular in compensating power problems for nonlinear and unbalanced loads. Any change in the load affects the DC-link voltage (DCLV) directly. Conventionally, a PI controller is used to maintain the DCLV to the reference value, but its transient response is poor. So, fuzzy logic controller is proposed which shows better dynamic response. To trigger inverter HCC is used. The proposed inverter with the control when connected to wind energy, helps the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appear as balanced linear load to the grid. With MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated here.