Implementation of coordinated voltage control for the Swiss transmission system

This paper outlines the organization of the ancillary service “voltage control and provision of reactive power” for the deregulated Swiss electricity market environment. A central voltage/reactive power management concept was elaborated and introduced with the respective operational procedures, from day-ahead planning to ex-post monitoring and accounting. Economic incentives were defined for all involved parties within Switzerland. This article describes the main features of the concept and its implementation. A conclusion summarizes practical experience and possible future improvements.