Voltage Control in a Power System with Renewable Sources of Energy

Intensive development of distributed generation in power systems, caused by the European Union energy policy, gives possibility for improving safety in power delivery as well as optimizing the costs of the systems functioning. In this context, distributed generation can be used for voltage control in power systems - it can be performed by the control of reactive power of each source of energy or a group of energy sources. This paper presents a method of renewable energy sources control, with the use of a supervisory control system, which operation utilizes fuzzy logic. This control system allows to improve the voltage in the power system - analyzes voltage levels at selected points of this system and affects a group of renewable energy sources.