Power quality enhancement of micro-grid using DG and power quality conditioner

摘要

This paper focus on specially designed DG based Power Quality Conditioner for Micro Grid applications. Three leg inverter coupled with solar PV with MPPT used as Compensator can be used for distinct DGs in the micro grid for power quality improvement of the entire system. Optimum control can be achieved to avoid detraction for voltage, current and Power flowing between Grid and DG. By adjusting power distribution among shunt connected DG for ensuring Voltage and current balance inside micro grid, the said topology able to compensate unwanted Zero sequence, positive sequence and negative sequence components of voltage, current inside the entire Grid system. The Power Quality conditioner and DG inverter have dual use for this particular purpose. Primarily used as power converter for injecting power created from DG to Grid, secondly performed as parallel Active Power Filter for compensating harmonics, unbalanced voltage, current, active and reactive power demand for the balance and unbalance burden with in the Grid and neutral conductors. All these said objectives can be achieved individually or can be achieved in grid connected mode. It can be observed that after compensation 3Φ 4 wire linear and nonlinear Burdens appears as balanced linear Burdens for the grid. The above mentioned task extensively simulated under MATLAB/Simulink platform revels that soon after compensation the THD (total harmonic distortion) Value in both supply current and supply voltage for all phases drastically reduced say within 5% well suits to IEEE519 standard.