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IMPLEMENTATION AND PERFORMANCE EVALUATION OF A FAST DYNAMIC CONTROL SCHEME FOR CAPACITOR-SUPPORTED INTERLINE DVR ABSTRACT Electronic systems operate properly as long as the supply voltage stays within a consistent range. There are several types of voltage fluctuations that can cause the systems to malfunction, including surges and spikes, sags, harmonic distortions, and momentary disruptions. Among them, voltage sag is the major power-quality problem. Dynamic voltage restorer (DVR) is presently one of the most cost-effective and thorough solutions to mitigate voltage sags by establishing proper quality voltage level for utility customers. Its function is to inject a voltage in series with the supply and compensate for the difference between the nominal and sagged supply voltage. The injected voltage is typically provided by an inverter, which is powered by a dc source, such as batteries, flywheels, externally powered rectifiers, and capacitors. The implementation of a fast dynamic control scheme for capacitor supported interline dynamic voltage restorer (DVR) is presented in this project. The power stage of the DVR consists of three inverters sharing the same dc link via a capacitor bank. Each inverter has an individual inner control loop for generating the gate signals for the switches. The inner loop is formed by a boundary controller with second-order switching surface, which can make the load voltage ideally revert to the steady state in two switching actions after supply voltage sags, and also gives output of low harmonic distortion. The load-voltage phase reference is common to all three inner loops and is generated by an outer control loop for regulating the dc-link capacitor voltage. Such structure can make the unsagged phase(s) and the dc-link capacitor to restore the sagged phase(s). The rectifier-based source requires a separate service supply, while the battery-based source requires regular maintenance and is not environment friendly. No external source is required in the DVR. The computation method is purely based on sinusoidal waveforms; the implementation is complicated in distribution network with nonlinear load. Based on the steady-state and smallsignal characteristics of the control loops, a set of design procedures are provided. Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad www.kresttechnology.com, E-Mail : [email protected] , Ph: 9885112363 / 040 44433434 1 By integrating a recently proposed boundary-control method with second-order switching surface (inner loop), the dynamic response has been minimized to two switching actions. Longduration voltage sags, swell, and three-phase voltage unbalance could be overcome by the proposed power-flow controller (outer loop). The quality of the load voltage under unbalanced and distorted phase voltages, and nonlinear inductive loads will be studied. Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad www.kresttechnology.com, E-Mail : [email protected] , Ph: 9885112363 / 040 44433434 2