Transmission system operator is responsible for maintaining the balance between the production and the consumption of electricity. To ensure the stability of electric power system, the system operator uses ancillary services, such as frequency control and active power. Mostly, the control is provided by the conventional power units which are selected for this and which must be on standby in case of demand for control. Besides the conventional power units there are various methods of storing energy, which can be converted back to electrical energy and used for control. A number of technological developments in the field of electrochemical storage of electricity enable us to store electrical energy in battery storage. These enable a more precise control of electrical energy and provide an improved performance quality of the service. Due to an increased use of renewable energy sources, big changes may start to occur in electricity production. Due to this, a lot of research is done on the ways of providing for increased demand of control.
The thesis explores the field of secondary frequency control and also presents the criteria of system operator and technology, which needs to be meet if we want to participate in control. The thesis also presents the potential use of battery storage, electric-vehicle batteries and end-of-life electric-vehicle batteries to provide ancillary services for the secondary frequency control of power system. Presented is the economic assessment and justification of using battery storage, electric-vehicle batteries and end-of-life electric-vehicle batteries storage for secondary frequency regulation. The advantages and disadvantages of such EPS control are shown.
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