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Control of dynamic voltage restorer (DVR) based on introducing a new approach for the on-line estimation of symmetrical components

The main duty of Dynamic Voltage Restorer (DVR) is protection of sensitive loads against voltage disturbances especially voltage sags and swells. DVR should possess necessary response time in restoring load bus voltage to avoid load interruptions. One the most important factors that affects the performance of DVR is the estimation algorithm which is used in control unit of this compensator. This paper presents a new fast-response algorithm for the on-line estimation of symmetrical components in harmonic distortion condition which provides adequate response time and accuracy for dynamic voltage restorer. Furthermore performance of this algorithm would be compared with some well-known estimation techniques using MATLAB/SIMULINK. Application of the proposed estimation approach is realized by representing a new control unit for compensation of different voltage sags and swells. Finally the simulation results which obtained using PSCAD/EMTDC confirm the efficiency of suggested control unit.