PMSM Drive Based D-STATCOM in Combination with Renewable Energy Sources to Enhance Power Quality

Abstract

In this concept Fossil fuels are non renewable and environmentally damaging. Due to increasing air pollution, global warming concerns, diminishing fossil fuels and their increasing cost have made it necessary to look towards renewable sources as a future energy solution. There are many Renewable Energy Sources (RES) such as wind, solar, tidal power, biomass etc. Solar energy has great potential to supply energy with minimum impact on the environment, since it is clean and pollution free. In finding solutions to overcome a global energy crisis, the Photo Voltaic (PV) system has attracted significant attention in recent years. The extensive use of these non-linear loads causes harmonic injection into the system which affects the quality of the power supply. These harmonics current causes problems like equipment overheating, supplementary losses, EMI related issues and damage devices etc. Harmonics are introduced into the system by diode or thyristor loads. These harmonics are to be filtered to make the system behavior as per the proposed operation. The power quality problems like current harmonics, current unbalance due to unbalanced and non linear load connected to the PCC is compensated effectively by using shunt active power filter (APF). The hysteresis current controller is used to generate the switching pulses for the gate drives of grid interfacing inverter. The total harmonic distortion (THDs) of the source currents are reduced by using shunt active power filter (APF). The THDs of the distribution system with and without APF are compared. The PMSM motors are a type of synchronous motor this means the magnetic field generated by the stator and the magnetic fields generated by the rotor rotate at the same frequency there are two types of stator windings variants: trapezoidal and sinusoidal motors. This differentiation is made on the basis of the interconnection of coils in the stator windings to give the different types of back Electromotive Force (EMF).The speed of the PMSM motor is controlled by varying thedc bus voltage of the voltage source inverter (VSI) feeding the PMSM motor via a PFC converter. Therefore, the PMSM motor is electronically commutated such that the VSIoperates in fundamental frequency switching for reducedswitching losses.The whole work is been done in  MATLAB/SIMULINK.