Development of a power converter control system for increasing system stability after an emergency in distributed networks

Abstract

Thanks to the development of technologies and their price reduction, there are more opportunities for integrating renewable energy sources and creating networks with distributed generation. In these networks, generating units are represented by small synchronous generators, photovoltaic units, or wind turbines. To control and efficiently integrate them into existing networks, power electronics converters are used. All this affects the decrease in the inertia of the system as a whole, therefore, the speed and nature of transients as a result of, for example, short circuits in the network is significantly changing. Thus, in the event of a power shortage due to loss of generation or loss of communication with the system, a significant decrease in the frequency is possible in very short time intervals due to the small values of the system inertia. In addition, there is an acute question for the board, operational reliability and stability of networks with distributed generation in isolated operating modes, since there is a problem of coordination of each of the inverters and their correct configuration.