MULTILEVEL INVERTER BASED DSTATCOM FOR COMPENSATION OF REACTIVE POWER AND HARMONICS

Author’s Name : Swathi Gopan S

Volume 02 Issue 02  Year 2015  ISSN No:  2349-2503  Page no: 11-15

Abstract – A five-Level Cascaded H – bridge (CHB) Inverter as Distribution Static Compensator (DSTATCOM) is used in Power System (PS) for compensation of reactive power and harmonics. The DST ATCOM helps to improve the power factor and eliminate the Total Harmonics Distortion (THD) drawn from a Non-Liner Diode Rectifier Load (NLDRL). The D-Q reference frame theory is used to generate the reference compensating currents for DSTATCOM while Proportional and Integral (PI) control is used for capacitor dc voltage regulation. A CHB Inverter is considered for shunt compensation of a 11 kV distribution system. Finally a level shifted PWM (LSPWM) and phase shifted PWM (PSPWM) techniques are adopted to investigate the performance of CHB Inverter.

Keywords – DSTATCOM; Level shifted Pulse width modulation (LSPWM); Phase shifted Pulse width modulation (PSPWM); Proportional-Integral (PI) control; CRB multilevel inverter; D-Q reference frame theory