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The article deals with the urgent task of creating a technological and production basis for the development and serial production of energy storage systems with flow batteries and uninterruptible power systems based on them. Flow batteries are a highly efficient solution for long-term energy storage in critical and alternative energy facilities. The main advantage of the flow batteries is the ability to create a system with the required power and capacity without redundant parameters due to the fact that the characteristics of the system are regulated by independent blocks, as in a fuel cell. Among flow batteries, vanadium redox flow batteries (VRFB) are of particular interest, as they have a long service life. The main elements of a flow battery are the stack, which determines the power of the battery and its efficiency, and the electrolyte, which determines the energy capacity of the battery and its service life. A stand for testing the operating modes of the flow battery stack has been developed. A 5 kW flow battery operating on an electrolyte with the addition of hydrochloric acid, which is a stabilizer in new generation electrolytes, has been tested.

The paper describes an experimental model of a hybrid power source (HPS) on the basis of solid oxide fuel cells (SOFC) being developed by the authors. HPS includes generating system, power storage system, pairing system and an active-adaptive control system. Generation system includes a reformer and a modular electrochemical generator based on SOFC. The storage system consists of a capacitive storage (CS) and accumulation batteries (AB). Accumulation batteries are made of alkaline nickel-cadmium batteries with improved power characteristics. A converter of current distribution (CCD) makes the basis of HPS pairing system. The authors developed a schematic diagram of CCD with three DC/DC upconverters. To implement an active-adaptive control system an algorithm of HPS operation was developed. The investigation of currents redistribution modes was carried out on the HPS simulation computer model developed by the authors. The research made it possible to determine the mode of stabilization of generated power, providing maximum SOFC utilization ratio.