Development of large-capacity SVC using self-protective light-triggered thyristor

A static var compensator (SVC) was developed using a light-triggered thyristor with an overvoltage self protection function. In order to reduce the installation space for the equipment, we adopted a multiple valve unit (MVU) structure. This paper introduces the thyristor valve developed for a large-capacity SVC and some results of factory tests and experiences from operation in the field. The advantages of the proposed SVC are described in comparison with the conventional one.