FACTS based voltage Enhancement in hybrid DG distribution system with mixed load model.pdf

Abstract

In a complex interconnected ac transmission network, problems like voltage deviation during load changes and power transfer limitation are observed due to reactive power unbalances. Also, the loads of the system are uncontrolled and depend on voltage and frequency of the system. Therefore, static mixed load models are considered here to include the voltage dependability nature of loads. Conventionally fixed type shunt capacitors and reactors used for balancing reactive power supply and demand. Power Electronics based Flexible AC Transmission systems
(FACTS) controllers are fast, flexible and highly reliable reactive power compensators .In FACTS controllers, second generation (Inverter based) controllers are superior to first generation (Passive elements based) controllers in power system voltage stability improvement. This work compares the performances of fixed compensator (capacitor), first generation (Static VAR Compensator-SVC) and second generation (Static Compensator-STATCOM) FACTS controllers in voltage profile improvement of IEEE 34 bus radial distribution system. The optimal placement of compensating devices is found using voltage sensitivity and loss sensitivity factors. The impact of inclusion of hybrid DGs (Distributed Generators) on the three methods of reactive power compensation of the same system is also deeply studied for the mixed load model.