Tiutiunnyk F. Increasing the static stability of electrical systems, taking into account the influence of the characteristics of heterogeneous sources of distributed generation

Due to the global trend of penetration of different sources of distributed generation, the task of stability evaluating and assurance is exacerbated, which confirms by the intensity of research and publications in recent years. The aim of the study is improving the static stability of electrical networks with distributed generation sources by improving inverter control systems and further development of approaches to evaluating the stability of such systems. Control system should work both at the level of control of a single source of distributed generation, and at the level of coordination of modes of several sources. In order to study the operation of the control system at different levels, models were developed in the MATLAB / Simulink environment and simulations were performed. During the simulation, two ways of changing the power of the source were considered – changing the modular value of the emf and changing the angle of the emf. The equivalent of controlling the modular value of the emf, in the context of connection via an inverter, is controlling the modulation factor of the pulse width modulation unit (PWM). Appropriate series of simulations were performed using the MATLAB/Simulink package. Graphical dependences are build, which represent the main elements of the mathematical model. The main practical value of the results is the improvement of control systems within the algorithmic part, i.e. control strategy. Within the problem of synthesis of control strategy the main stages and components are proposed. The main dependences obtained in the process of developing a mathematical model are considered, and the principles of parameter coordination in the integration of these components into the control strategy are established. An important component of the management strategy is the task of estimation the limit on the stability of the mode and obtaining indicators.