Analysis And Development Of Grid Connected Front-End AC To DC Converter Using Voltage Oriented Control (VOC)

Balan, Vivien (2018) Analysis And Development Of Grid Connected Front-End AC To DC Converter Using Voltage Oriented Control (VOC). Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This project is about the analysis and development of grid connected front end AC to DC converter using Voltage Oriented Control (VOC). Nowadays, the use of power electronic converters in industry are kept expanding. In industry, there is a problem in transmission and distribution lines as the harmonic and reactive currents are being injected into the system. Therefore, in electric power system, voltage control is important for proper operation for electrical power equipment. This is important to prevent any damage that might occur. Besides, the input current with non-sinusoidal shape drawn by conventional AC to DC converter generates significant harmonic components. The current harmonic components increase the current consumption and increase the power loss of utility equipment. As a result, overheating might happen in the generator and motor windings and the transmission line. One of the control methods for AC to DC converter is VOC. VOC controls the active and reactive power between grid and load by controlling approximately the three phase line currents and magnitude of the converter DC output voltage. Sinusoidal Pulse Width Modulation (SPWM) is used to determine the switching state of the converter. In addition, matrix transformations like Clarke Transformation, Park Transformation, Inverse Clarke Transformation and Inverse Park Transformation are used to simplify the development of the control method. The steady state performance and Total Harmonic Distortion (THD) of the line currents are analysed before and after the implementation of VOC method. The operation is kept at unity power factor with lower current THD. In a nutshell, by using VOC method, the three-phase input currents and voltages are almost in sinusoidal shape. Finally, a regulated DC power supply utilizing three-phase AC to DC converter can be constructed.

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