Reactive Power Compensation with DSTATCOM in different modes of operation of a Single Phase Micro grid

Abstract

This paper describes synchronized control of distribution static compensator (DSTATCOM) and distributed generators (DG) in a Micro grid. With large diffusion of distributed sources and system with single phase operation system may even have disturbance in voltage quite often if crosses the permissible limit. Reactive power compensation cannot be always possible with the devices having three phases at place of good position with the feeders physically spread out. Communication with DSTATCOM in a loop with a simple control strategy is proposed in this paper. The main factors like power flow in the line and the voltage sag are considered in the proposed reactive compensation technique. In order to moderate the reactive compensation, communication can be done to DSTATCOM with the help of feeders located at different points having the voltage and power flow in line. Maximum power which is actively available is provided by DGs and the reactive power compensation is done in the phase having shortage of reactive power with the help of single-phase DSTATCOM. In order to increase the reactive power inoculation ability of the DGs, the maximum available active power is fixed to a value lower than maximum active power during the permissible limit of the reactive power of the DG. In case of communication failure, a part of reactive compensation is always required by a primary control loop based on local measurement in the DSTATCOM. Permissible voltage regulation is observed and ensured in