Methods for Formation and Tunning of Group Prognostic Controller of Hydrogenerators Rotors' Rotational Frequency

Abstract

The application of a large number of distributed generation plants, built on the basis of synchronous generators in electric energy system (EES), requires solving the problem of their centralized control, adjustment of local controllers and stabilization of alternating current frequency, which entails taking into account a large number of interrelated system parameters. For example, the use of several hydrogenerators in a small-scale HPP requires solving problems of distribution and optimization of their load, as well as group control. These problems can be solved using prognostic control algorithms. Below is a description of the method to control the frequency of a group of low power synchronous hydrogenerators, the description of computer models of DG plants and the proposed group power controller of prognostic type, as well as the simulation results in the modes of additional powerful load connection and disconnection from EES. The research was conducted in MATLAB environment. The aim was to determine the effectiveness of group control of prognostic speed controllers of several hydrogenerators of the same type in emergency and post-emergency modes. The results of computer simulation indicate that the use of prognostic controllers reduces overshoot, oscillability index and transient time for voltage, rotational frequency and frequency in the normal and emergency conditions. The proposed methods of formation and tunning the group prognostic speed controllers allow to improve quality indices of small-scale HPP voltage and frequency control, while retaining the former settings of the local controllers.