Modeling of facts and custom power devices in distribution network to improve power quality

Electromagnetic transient studies have always played an essential role in the analysis of electrical power systems. They provide priceless information relating to the behaviour of the system in the event of different forms of transient phenomena, which can hardly be achieved by other means. In this paper, an electromagnetic transient model of Fixed Capacitor/ Thyristor Controlled Reactor (FC-TCR) is developed and applied to the study of transients due to load variations. The work is then extended to custom power equipment, namely Distribution Static Compensator (D-STATCOM) and Dynamic Voltage Restorer (DVR) aimed at enhancing the reliability and quality of power flows in low voltage distribution networks. A new PWM based control scheme that requires only voltage measurements and no reactive power measurements has been proposed for both the custom controllers. PSCAD/EMTDC simulation tool is used for model implementation and to carry out extensive simulation studies. Comprehensive results are presented to assess the performance of each device as a potential custom power solution.