FEATURES OF PHOTOVOLTAIC STATION OPERATION ON AC VOLTAGE THAT EXCEEDS ACCEPTABLE LIMITS

Abstract

The growing power of renewable energy sources in the energy systems of Ukraine causes the problem of maintaining the parameters of electricity within acceptable limits set by the current country standards. In the context of this issue, the paper analyzes the parameters of the photovoltaic plant, which are connected to the central grid, during the year. The results of the analysis of the real data of the station confirmed the presence of the problem of overvoltage at the terminals of the photovoltaic power plant and nearest grid. This paper presents the analysis of parameters of electrochemical batteries which provide support for the central grid and increase the efficiency of photovoltaic stations. The battery stores electric energy during an increase of voltage in the network and discharges energy to the consumer when the voltage level at the connection point is normal.

To assess the effectiveness of the proposed approach, an analysis of the specifics of the photovoltaic plant operation accepting limitations of the energy quality is proposed. The amount of electricity supplied to the network at the overvoltage level is determined. It is established that the use of a battery storage system helps to stabilize the parameters of the output electricity from the PV plant to the network and reduces the negative impact on nearby consumers. The profitability of the buffer accumulator as a part of the network photovoltaic power plant is estimated and the advisability of creating an optimization model for selecting the required capacity is shown, which will reduce the capital costs of such a solution.

Scientific provisions, conclusions and recommendations formulated in the paper are based on the results of statistical analysis of data from the existing photovoltaic plant, theoretical and practical provisions.