Power Balancing Mechanism and Controller Design for the Single-Phase Cascaded H-bridge Multilevel DSTATCOM

Yang Han

doi:10.5755/j01.eee.19.1.3246

Abstract

The power balancing mechanism and the effective voltage balancing control algorithm are presented for the single-phase cascaded H-bridge multilevel DSTATCOM. The dc voltage balancing control for CHB-DSTATCOM is splitted into the average voltage controller and the voltage balancing controller, which are designed to regulate the active power flow between the CHB-DSTATCOM with the grid and to regulate active power flow among each inverter units, respectively. The effectiveness of the control algorithm is validated by the simulation results. DOI: http://dx.doi.org/10.5755/j01.eee.19.1.3246

Highlights

Due to the proliferation of power-electronic equipment, the amount of harmonic currents flowing into electrical distribution networks is growing rapidly in recent decades
The multilevel and multi-cell voltage source inverters (VSI) are increasingly used for the power quality conditioners [2]. These multilevel inverters, which benefit from several advantages such as low switching ripple, low conduction losses and small dv/dt, effectively improve the bandwidth of the compensators [3]
The simulation results of the cascaded H-bridge (CHB)-DSTATCOM for power quality compensation is presented, which validates the validity and effectiveness of the devised algorithm

Summary

INTRODUCTION

Due to the proliferation of power-electronic equipment, the amount of harmonic currents flowing into electrical distribution networks is growing rapidly in recent decades. These nonlinear loads draw non-sinusoidal currents from the distribution networks, which causes interference to the sensitive loads connected at the point of common coupling (PCC) and limits the available electrical supply [1]. The multilevel and multi-cell voltage source inverters (VSI) are increasingly used for the power quality conditioners [2]. These multilevel inverters, which benefit from several advantages such as low switching ripple, low conduction losses and small dv/dt, effectively improve the bandwidth of the compensators [3]. The simulation results of the CHB-DSTATCOM for power quality compensation is presented, which validates the validity and effectiveness of the devised algorithm

SYSTEM DESCRIPTION OF THE CHB-DSTATCOM

POWER BALANCING CONTROLLER DESIGN METHODOLOGY

SIMULATION RESULTS AND DISCUSSIONS