Abstract
With the development of high technology industries, the proliferation of voltage-sensitive load equipment has made industrial processes much more vulnerable to degradation in the quality of power supply. Among the several novel custom power devices, the dynamic voltage restorer (DVR) for application in distribution systems is a recent invention. The purpose of this thesis is to design a 12-pulse series-type Dynamic Voltage Regulator . A direct current capacitor is employed as the storage device for the DVR and the 12 - pulse control technique is used to adjust the output voltage of the three-phase voltage-source inverter (VSI). The 12-pulse VSI is compared with the Pulse Wide Modulated (PWM) VSI. Both steady-state performance and transient characteristic of the DVR are investigated in the thesis. To show the advantage of the proposed 12-pulse VSI, compensation capability and power loss are investignted. The purpose is use a lower direct current capacitor voltage than the PWM VSI to achieve voltage compensation. The effectiveness of the designed DVR is first investigated by digital simulations using the MATLAB software. Then, in the experiment, the control kernel of the digital system for the DVR is based on a personal computer with data acquisition cards. Voltage compensation is achieved through the computer coder written in C language. Finally, it is concluded from results of simulations and experiments that load bus voltage can be effectively and superiorly regulated by the designed 12-pulse VSI DVR.
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