Switching Pattern for Transformer Cascaded Inverter in Dynamic Voltage Restorer Structure

Subject Areas : Communication

Shirin Soltani ¹ , Majid Dehghani ² , Majid Moazzami ³

1 - Department of Electrical Engineering, Dehagh Branch, Islamic Azad University, Dehagh, Isfahan, Iran
2 - Smart Microgrid Research Center, Najafabad Branch, Islamic Azad University, Najafabad, Iran
3 - Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Naein, Iran

Received: 2020-11-28 Accepted : 2021-03-31 Published : 2021-09-01

Keywords: switching, Dynamic Voltage Restorer, cascade inverter,

Abstract :

Sensitive loads cannot tolerate voltage sags and swells in power distribution networks and lots of problems are engendered for them. Therefore, dif f e rent instruments are pla nn ed to compensate volt a ge swells and sags. Between them dynamic voltage restorer (DVR) has found special import a n c e, because it operates better than others for this purpose and restores voltage to its initial value conveniently. A DVR is a power-electronic controller that can protect sensitive loads from disturbances in the supply system. The DVR is installed in series to the network. In this paper 9 level cascaded inverters with cas ca d ed transfor m e r s are used in DVR internal circuit, but the difference in magnetic flux in cascading transformers has adverse effects on the plan. Therefore, a new switching pattern is used