Application of compact static VAR compensators to distribution systems

The application of SVCs (static volt-ampere reactive compensators) to distribution systems to solve voltage fluctuation problems is discussed. Fast and repetitive voltage fluctuations can exist on an electric utility's distribution system. These voltage fluctuations, which are usually caused by motor-starting or other pulsating or irregular loads such as welders, can be objectionable and can pose problems to the utility. Conventional equipment such as voltage regulators or breaker-switched capacitors are not effective in controlling fast and repetitive voltage fluctuations. Static volt-ampere reactive compensators provide an excellent solution to control voltage fluctuation problems. It is more common to apply SVCs to transmission systems and very large industrial loads because of size and cost constraints. A class of compact SVCs which offers ratings as low as 1 Mvar capacitive and small physical size is described. With the advent of compact SVCs, distribution engineers have another viable option available to solve many of the voltage fluctuation problems in their systems. Information and field experience concerning the compact SVC installed on the Kansas Gas and Electric distribution system are provided. >