An active dynamic LVRT solution for balanced and unbalanced grid faults in a power system by using “Sen” Transformer

In the recent trends the electrical grid is being interconnected with various types of non-conventional energy sources like solar, wind, etc. Some of the sources like wind turbine generators are vulnerable to grid side voltage sags and short circuits. This paper provides the new LVRT (Low Voltage Ride Through) solution for balanced and unbalanced grid faults in an electrical power system network. Till now “Sen” Transformer was used as a power flow controller. In this paper the Sen Transformer is used as a series voltage compensator under fault condition. The simulated model of the “Sen” Transformer during the balanced and unbalanced grid faults for maintaining the voltage stability of the system is presented so that the sensitive load will stay connected to the grid and the grid will not lose its synchronism during the fault and normal operation can be continued after the fault .The proposed solution is proven to be reliable and cost-effective when compared with the emerging technology of dynamic voltage restorer (DVR).