Modeling and analysis of deadbeat controller based split capacitor dstatcom for dc voltage regulation

Abstract

The Power quality is effected when three phase diode bridge rectifier and star connected load is connected in distribution side. Due to the presence of three phase diode bridge rectifier there are various effects in distribution side such as harmonics, voltage sag, voltage swell, and excessive neutral current. In conventional split capacitor DSTATCOM D.C voltage is fixed and is selected based on its reactive power. Under light loaded conditions reference D.C voltage can’t vary as per load requirement so D.C voltage is high. In order to make D.C voltage as constant large number of switches are required because of that switching losses are more due to which power quality is reduced. As switching losses are more an adaptive split capacitor faces a disadvantage i.e., current harmonics. To reduce all above power quality issues a deadbeat controller is used in adaptive split capacitor DSTATCOM is proposed in this paper. It consists of Zero Crossing Detector (ZCD), Unit vector Generation, Terminal Voltage, Deadbeat Voltage control. The MATLAB SIMULINK tool is used for analyzing the performance of deadbeat controller based adaptive split capacitor DSTATCOM control scheme which is used for unbalanced loads to improve power quality.