FERRORESONANT PROCESSES IN POWER SUPPLY SYSTEMS WITH DISTRIBUTED GENERATION
Authors:   Omsk State Technical University, Kosarev Boris 
Published: December 2022

Relevance The article is devoted to the study of the possibility of occurrence of ferroresonant processes in power supply systems with distributed generation. Ferroresonant processes cause overvoltages in electrical installations and lead to their failure. In backbone and distribution networks without distributed generation facilities, the phenomenon of ferroresonance has been studied quite deeply, effective hardware and operational measures have been developed to prevent the occurrence of ferroresonance surges in electrical installations. However, the issue of the occurrence of ferroresonant processes in power supply systems with distributed generation, which is a promising direction in the development of the energy sector, seems to be little studied. Aim of research The main aim of the research is to investigate circuit-mode conditions for the occurrence of ferroresonant processes in power supply systems with distributed generation. Research methods To study the circuit-mode conditions for the occurrence of ferroresonant processes in power supply systems with distributed generation, the main provisions of the theory of electrical complexes and systems, the theory of nonlinear electrical circuits, and the principles of controlling objects of electrical complexes and industrial systems were used. Results The circuit-mode conditions for the occurrence of ferroresonant processes in power supply systems with distributed generation are studied. The power supply system of a HF radio center, containing a power plant with a lower installed power or corresponding to the maximum power consumption of the load, was chosen as the object of study. The features of the scheme-mode conditions for the occurrence of ferroresonant processes under conditions of distributed generation are as follows. Due to the insignificant remoteness of distributed generation facilities and consumers, additional opportunities arise for subharmonic ferroresonant processes. When a generating plant is connected to low-voltage busbars, conditions are created for the occurrence of a ferroresonant process involving low-voltage windings of power transformers. The low dynamic stability of generating installations of distributed generation facilities based on synchronous generators reduces the likelihood and duration of ferroresonant processes in the event of phase wire breaks and short circuits on the power line. Generating plants connected via grid inverters have a limited output current and can be turned off by emergency automatics in the event of an emergency operation of the grid, which, as a rule, precedes the appearance of ferroresonant overvoltages in electrical installations. Thus, in power districts with distributed generation facilities, the circuit-mode conditions for the occurrence of ferroresonant processes, known in the centralized power supply system, undergo changes, and it is also possible to form new ferroresonant oscillatory circuits. Keywords: distributed generation, ferroresonant process, power supply system, oscillatory circuit, generating plant, relay protection and automation devices Acknoledgements: The work was carried out under the state order of the Omsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences (project state registration number 122011200349-3).