Study of Star Connected Cascaded H-Bridge STATCOM using Different PWM Techniques

Ch. Lokeshwar Reddy1; P Rajesh Kumar

Ch. Lokeshwar Reddy1 Assoc. Professor, CVR College of Engineering/EEE Department, Hyderabad, INDIA
P Rajesh Kumar Assoc. Professor, CVR College of Engineering/EEE Department, Hyderabad, INDIA

Abstract

Two control algorithms are presented in this paper for STATCOM that meets the requirement of load reactive power and correspondingly voltage balancing of isolated dc capacitors for H-bridge Inverters used in STATCOM. The control techniques used for an inverter in this paper are Sinusoidal Phase Shifted Carrier (SPSC) PWM and Space Vector Phase Shifted Carrier(SVPSC) PWM. The STATCOM performance for the different load changes is simulated in MATLAB environment. The performance parameters such as balancing the DC link voltage, THD for the STATCOM output currents, voltages, and reactive components provided to the
load by the STATCOM are compared for both these control strategies.