Modeling and comparison of conventional and active step voltage regulators

Voltage quality has become more significant term because of more dynamic network structures and the raising sensitivity of customer equipment. Voltage quality includes an extensive scale of voltage irregularities and variations in voltage magnitude or waveform. Therefore, various voltage regulation techniques are implemented in distribution systems. Step Voltage Regulator (SVR) is one of the most effective voltage regulation devices available. SVR is a transformer based regulation device that is formed from one shunt connected winding and one series connected winding. SVRs detect voltage variation in the line and inject voltage by its series winding to regulate the voltage effectively. SVRs can be divided into two types as conventional and active SVRs according to their technology. Conventional SVRs that based on mechanical tap changers is inadequate for dynamic changes in the network due to its slow operation. Active SVRs consist of power electronics technology as electronic tap changers or matrix converters to enhance the voltage regulation capability of SVRs in terms of compensation response speed. In this thesis, conventional and active SVRs are modeled for 34,5 kV distribution system in MATLAB/Simulink simulation program. Their performances are evaluated through extensive simulation case studies for the compensation of undervoltage and overvoltage problems.