Proportional and Integral Variable Structure Controller (PI –VSC) for Grid Connected PWM Voltage Source Converter

Document Type : Original Article

Authors

1 Department of Electric power and machines, Faculty of Engineering, Helwan University, Cairo, Egypt.

2 Professor, Department of Electric power and machines, Higher Engineering Institute, Thebes Academy Helwan University, Cairo, Egypt. Abdelghany.mohamed@thebes.edu.eg

3 Department of Electric power and machines, Faculty of Engineering, 6 October University, Cairo, Egypt.

Abstract

This paper introduces an improved method for DC link voltage regulation in pulse width modulation rectifier (PWMR) applications. The mathematical model of PWMR in synchronous reference frame is introduced. This model is used to investigate and design of DC voltage and current control loops. The current controller is designed based on modulus optimum, magnitude optimum, (MO) criteria while the voltage controller is designed based on Proportional Integral (PI) with variable structure control (VSC) concept, which is denoted as PI-VSC. In PI-VSC, the control system switches between PI and pure I controllers according to pre-defined switching function. The PI-VSC has three tuning parameters, which are the PI-controllers gains and the switching function. The PI controller gains are tuned using Symmetrical Optimum (SO) criterion, while the switching function based on the absolute error signal. To verify the validity of the proposed controller, different simulation results are obtained under different operating conditions such as reference tracking and reference regulation at different loading condition and system parameter variation as sources of disturbances. The performance of the control system using PI-VSC is compared with the fixed structure PI controller obtained from MO and SO techniques.

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