New Control Strategy to Reverse the Power Flow in the Looped Electrical Distribution Network

Abstract

The distributed generators are very essential now-a-days due to power crisis. Generally distributed generators are connected in radial system. These radial systems are converted to looped or meshed network for improving the power transfer capability. So we are in need of power electronics converters for the injection of power. Here a static series synchronous Compensator (SSSC) can be used to do the same. So this type of SSSC is called D-SSSC. This scheme uses a Cascaded multi- level inverter which neglects the transformer and gives good efficiency. The looped network sometimes will be reversed the power flow operation. That time, the phases current are not considered in the earlier current phase locked loop control.  Using voltage phase locked loop, current phase locked loop control can be neglected. Here in this proposed project work the voltage phase locked loop and current phase locked loop are presented and comparative study is shown using simulink. The existing control strategy that is VPLL is dealt with PI controller. But it has some disadvantages like maximum overshoot, harmonics and more oscillation and settling time. In order to reduce these disadvantages the PID controller is used and a compared and presented for PI and PID controller in D-SSSC cascaded H-bridge to reverse the power flow.