Improving the Quality of Electric Energy at Hydrogenerator Units by Upgrading Control Systems

We have solved an important scientific-technical task on improving the quality of electric energy produced by hydrogenerator units. The relevance of this topic is predetermined by the fact that existing systems that control frequency and power of hydrogenerator plants do not fully meet International standards regarding the quality of electric energy. The set task is resolved based on the structural-parametric synthesis and optimization of automated systems that control rotation frequency and power based on solving inverse problems on the dynamics of a hydrogenerator unit with the improved system of metrological assurance. In order to analyze and synthesize a precision controller, we have refined a mathematical model of the hydrogenerator and the controlling element of an electro-hydraulic regulating system. The improvement makes it possible to register leaks, overflows, as well as the non-linearity in characteristics of the servomotor.A structural diagram of the astatic controller is represented, which corresponds to the improved mathematical model, as well as the numerical values for parameters of the structural diagram, defined based on the results of experimental study. We have applied the principle of multiple control. This has made it possible to simplify the structures, parametric synthesis, and parameter setting of the controller. The paper shows the analysis of experimental studies carried out at the operating equipment of hydroelectric power stations (Bajtun, Panama). We give a comparative analysis of work of controllers, based on the principles of PID control, a controller made by Emerson company, and a regulator built on solving the inverse problems of dynamics. The proposed system of automated control over hydrogenerator plants ensures a two-fold increase in the accuracy of control over rotation frequency and power, which improves the quality of electric energy that is generated at hydroelectric power plant