Dryomin I. Generalized Models and Tools For Enhancing the Efficiency of Automatic Frequency and Power Control in Interconnected Power Systems

The thesis is devoted to the development of a generalized models and tools for enhancing the automatic frequency and power control (AFPC) in interconnected power systems, including systems where both power plants and controllable loads can simultaneously act as regulators. Analysis of the condition and organization of AFPC systems in power associations showed that the primary and secondary stages of frequency and power control are the most significant. To investigate process of regulation in these stages, we have developed the generalized AFPC model of interconnected power system, which represents systems of differential equations and nonlinear (technological) restrictions, which enable one to take into account the specific character of each object in the power system. We have also developed a generalized mathematical model of power flows in interconnections. To carry out these studies, we have developed a problem-oriented program-information complex, which enables one to determine the optimal laws and parameters of control for different interconnected systems and AFPC structures. We have considered proportional, proportional-differential and proportional-integral-differential control laws and determined their best options for different types of regulators. These studies were performed in both linear and nonlinear statement. We have established that the efficiency of regulation by controllable loads is significantly more efficient than generator-regulators in a stand-alone mode of the interconnected power system of Ukraine and in parallel with the European power system.