Modeling, Controller Design and Simulation of Power System Friendly Power Supply

Abstract

The paper is based on the performance comparison of single-phase diode-bridge rectifier and the proposed front-end converter in terms of the Total Harmonic Distortion (%THD) of the line current, power factor of the system and ability of energy saving of the converter by capability of reverse power flow action. The parameters of the voltage control-loop for proposed converter are derived by two methods named Unity Modulus (Magnitude Optimum) method and Ziegler-Nichols method. The parameters obtained from both the methods are compared by the mathematical model for forward and reverse power flow mode of operation. The model is generated in Simulink toolbox of MATLAB and results are obtained for steady state, transient and dynamic conditions. It is observed that the unity power factor is maintained during all the conditions for various loads. Drastic reduction in %THD of input current waveform is obtained in proposed power supply with an added advantage of regenerative capability. For comparison of results of control-loops, a programming file (M- file) is also generated in MATLAB and from the same file the step-response and Nyquist plots are obtained for system control-loops. The experiment results are also obtained for the prototype converter in inverter mode. The power system friendliness of the proposed front-end converter is quite evident from the results presented in the paper.