Sliding Mode Control of H Bridge Inverter Based DSTATCOM for Reactive Power Compensation

S Krishna Kumar,S Chandramohan

doi:10.19026/rjaset.8.1222

Abstract

Reactive power compensation plays a key role in reducing distribution losses by improving power factor. A three phase three wire DSTATCOM consisting of a five level H-bridge Voltage Source Converter (VSC) is proposed for improving power factor in the distribution system at the Point of Common Coupling (PCC) when the load is continuously changing. The sliding mode control algorithm is used for reactive power compensation and achieve unity power factor. To accomplish this DSTATCOM is controlled to supply or absorb reactive power at PCC. Sinusoidal PWM method is used for obtaining the switching pulses for the cascaded H-bridge converter. The performance of the DSTATCOM controlled distribution system is validated by simulations using MATLAB/Simulink software and Power System block set toolboxes.

Highlights

There has been a considerable interest in power quality. This is mainly due to the increase in nonlinear loads such as power electronic converter based adjustable speed drives, electronic ballasts etc., which have deteriorated the power quality
In the recent years, there has been a considerable interest in power quality
The Simulink model of DSTATCOM controlled distribution system is built for the power circuit shown in Fig. 1 and system parameters are AC source voltage Vt = 400V(RMS); Line resistance Rs = 0.00010 Ω, line inductance Ls = 3 mH, DSTATCOM resistance R = 0.0001Ω, L = 0.1 mH, load resistance = 50 Ω, load inductance = 3 mH, single capacitor in the dc side = 60.2 mF

Summary

Introduction

There has been a considerable interest in power quality. This is mainly due to the increase in nonlinear loads such as power electronic converter based adjustable speed drives, electronic ballasts etc., which have deteriorated the power quality. A cascaded five level H bridge inverter based DSTATCOM has been proposed for reactive power compensation. In this study sliding mode control technique is applied to a cascaded five level multilevel Fig. 2: Phasor diagram for UPF operation inverter based DSTATCOM for compensating reactive power.

Results

Conclusion