A new concept of multilevel DVR based on Mixed Multi-cell Cascaded topology

This paper presents the dynamic voltage restorer based on 13-level Mixed Multi-cell Cascaded Multilevel Inverter. This inverter is based on a new cell obtained from the mixture of the two most popular Multi-cell topologies, Flying Capacitor and Cascaded Multi-cell inverter. The new cell provides a high number of output levels, high modularity, low number of components and low losses. The proposed medium voltage dynamic voltage restorer, with high voltage power semiconductor modules and series booster transformer, is designed to protect loads at power distribution systems. A control technique based on in-phase voltage compensation is used for dynamic voltage restorer. Simulation carried out by using MATLAB/SIMULINK software. Simulation results show the performance of the proposed dynamic voltage restorer and prove the validity of the proposed topology. It is concluded that the proposed dynamic voltage restorer works well both in balance and unbalance conditions of voltages.