Vliv fotovoltaických elektráren na elektrizační soustavu

Abstract

Renewable energy resources represent a significant part of the overall energetic concept development. In recent years, there was a rapid expansion of photovoltaic power plant in electricity grid of Czech Republic. However, nowadays, there is their stagnation currently. The total maximum capacity value of all power plants achieves approximately 22.2 GW of witch photovoltaic plants represent 2.1 GW. From the perspective of the daily load diagram of electricity grid, photovoltaic power plants in their extreme production during afternoon, under appropriate weather conditions, contribute to the total electricity production from 15 to 20 %. This share is not negligible and has a direct impact on the reliability and quality of electricity supply. Photovoltaic power plants are sources that are highly dependent on weather conditions. This fact has an impact on their immediate produced power, which has a stochastic character. From the perspective of dispatching management and energy regulation, this situation presents an adverse condition for the electricity grid. Further increase these resources could lead to exceeding of regulatory and absorbing possibilities across electrical grid. In electricity grid, one rule has to be met. The balance between production and consumption of electricity must be equal in any time. Photovoltaic power plants themselves operations make it impossible to maintain this balance. This has an adverse effect on the operation and maintenance of network parameters within the required limits. This dissertation thesis analyses the operation of photovoltaic power plants with respect to the increase of reserve power in the form as ancillary services.