Использование прогностических регуляторов для улучшения качества процессов управления асинхронизированными гидрогенераторами

Abstract

The introduction of distributed generation (DG) plants into electric power systems (EPS) requires solving problems related to the development of control systems in normal, emergency and post-emergency modes in order to increase their reliability and stability. Asynchronous generators (ASG), which have advantages over synchronous machines can be used in DG plants. However, their application requires the development of modern automatic control systems (ACS). The article discusses a distribution electric network with DG plants based on ASG. At the same time, special attention is paid to the development of ACS ASG models. The aim of the research was to determine the effects of the use of predictive regulators (PR) for ASG management. For this purpose, modeling of the normal, emergency and post-emergency modes of the electric network was performed, which included two ASGs driven by hydraulic turbines. The third and fifth harmonics were generated in the connection node of the power plant. A three-phase short circuit in a 35 kV network with a duration of one second was considered as a disturbance. The results obtained allowed us to draw the following conclusions: the use of PR improves the quality of electricity. The harmonic coefficients of the voltage are reduced by 7.35 %, and the voltage asymmetry coefficients in the reverse sequence are reduced by 50 %. Predictive frequency regulators of ASG with a fixed forecast time calculated according to the proposed methodology improve the control processes. For example, the duration of the transition process for the first ASG is reduced by a third, and the maximum frequency deviation is reduced by 20 %. The degree of its attenuation increases by 33 %.