Analysis And Development Of Grid Connected Front-End AC To DC Converter Using Direct Power Control (DPC) Scheme

Ooi, Jia Sheng (2018) Analysis And Development Of Grid Connected Front-End AC To DC Converter Using Direct Power Control (DPC) Scheme. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project focuses on development of grid connected front-end AC to DC converter using Direct Power Control (DPC) scheme. Nowadays, three-phase AC to DC converters consisting of power electronic switched have been widely used in various industrial applications. However, power electronic switches such as diode and thyristor will generate non-sinusoidal shape of input currents from the main supply. These currents consists of high harmonic components which lead to the increasing of currents total harmonic distortion. The proposed DPC is able to reduce the current harmonics, hence lower the total harmonic distortion of the three-phase input current. DPC is able to control the active and reactive power without any internal current control loop. The optimum switching states for the converter are determined from a switching table. Therefore, the main objective of this project is develop a three-phase AC to DC converter controlled by Direct Power Control (DPC) scheme. Simulation will be done by using MATLAB Simulink. Besides, the three-phase input currents and voltages will be transformed into αβ frame by applying Clarke transformation. The current and voltage in αβ frame are used to estimate the active and reactive power. The power errors (Sp, Sq) and sector signal,

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