Dynamic Voltage Restorer For Sensitive Equipment

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Title: Dynamic Voltage Restorer For Sensitive Equipment
Author: Kuo, Yea Zong
Abstract: Voltage sags are considered to be the most frequent type of disturbances in the field based on recent power disturbances studies . Their impact on sensitive loads is severe . The impact ranges from load disruptions to substantial economic losses . Despite the technical advances in electronics , there are still some pieces of equipment that are so sensitive that they are unable to withstand voltage sags . An example is the equipment in semiconductor manufacturing . As a result , there is still a search for different ways to manage voltage sags . There are many different methods to mitigate voltage sags , but a CUstom Power Supply (CUPS ) device is considered to be the most efficient method . There are many types of CUPS . This dissertation studied various methods and concluded that the Dynamic Voltage Restorer (DVR ) is the most efficient and effective device to protect sensitive equipment against voltage sags . Its appeal includes lower cost , smaller size , and its dynamic response to the disturbance . There are two general types of DVRs : Minimal Energy Control DVRs and In -Phase Control DVRs . One includes energy storage , and the other does not include energy storage , respectively . This dissertation focuses on the In -Phase Control DVRs , the one without energy storage . This dissertation describes the DVR from the initial phase of research and analysis to the final phase of testing and constructing the device . The DVR described in this dissertation consists of many different features . One feature is that the filter used in the harmonics correction is based on the Wavelet Transform (WT ) . The selection of the WT based filter is different from conventional methods such as the Fast Fourier Transform (FFT ) in other DVRs . Another feature of the dissertation DVR is the hardware implementation . An FPGA board was selected to implement the dynamic controls instead of the traditional DSP board . Yet another feature is the power factor correction that was added later to the design in order to further enhance the dissertation DVR's overall capabilities . These features differentiate the dissertation DVR from other types of DVRs .
URI: http : / /hdl .handle .net /10106 /306
Date: 2007-08-23

Citation

Dynamic Voltage Restorer For Sensitive Equipment. Available electronically from http : / /hdl .handle .net /10106 /306 .

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