Analysis of a Neural Network Based Distributive Power Flow Controller (DPFC) for Power System Stability

Abstract: The Unified power Flow Controller (UPFC) is effective equipment in controlling the power flow in the new deregulated electricity markets. The UPFC realizes its function by changing part or all of the parameters affecting flowing of the power in a transmission line. These parameters include the bus voltages, the line impedance and the power angle. The UPFC is by far the most advanced and versatile device in the Flexible AC Transmission System (FACTS) device family. However, several problems, reliability, cost, and footprint requirement, hinder its widespread acceptance by the electric utilities. To overcome the drawbacks of the conventional UPFC, this work proposed and studied a new UPFC technology that addresses these impediments. This novel technology is called the Distributed PFC (DPFC). The proposed DPFC is based on single-phase system, considering the high voltage insulation, the manufacturing cost, and the installation requirement. A hierarchy control of the DPFC system is proposed, which includes local unit control and a central control unit. The central control unit calculates series voltage and shunt real/reactive power commands for every DPFC unit. The local DPFC unit accepts commands from the central control unit, monitors local voltage at the connection point, and realizes its control commands. The functions and performance of the DPFC system is verified with simulation and experiments