Zgurovets O. Development of models and means of ensuring the stable functioning of wind and solar power plants in power systems

A generalized mathematical model of the processes of frequency and power regulation in electric power systems (EPSs) with large wind power (WPPs) and solar power (SPPs) plants has been developed. A new adaptive law of regulation, consisting of the adaptive component and proportional-integral-differential law, was developed and used in the structure of the model. This allowed to increase both the accuracy of frequency stabilization in the EPS and the stability of the control system. On the basis of the created mathematical model, problem-oriented software "Chastota-M" was developed and a series of calculations on the study of frequency stabilization processes in such EPSs was carried out. It was established that in order to meet the requirements of frequency stability, the power of the regulator in the case of using high-speed battery energy storage systems (BESSs) should be 3 to 5 times less than the required power in case of use of hydroelectric power plants and be comparable to the total power of WPPs and SPPs. The use of the generalized mathematical model and problem-oriented software "Chastota-M" for studying the operating modes and structure of the frequency and power control system in the EPSs with the large capacities of the WPPs and the SPPs in its composition provides an opportunity to improve the structure of the Integrated Power System of Ukraine in the direction of a reasonable increase in the capacity of renewable energy sources. Keywords: battery energy storage systems, wind power plant, solar power plant, frequency stabilization, integrated power system.