source inverter (VSI) that combines the functions of an active power filter (APF) [2]. This contributes to increasing the utilization factor of CU due to its round-the-clock use [2-5] to maintain the maximum (close to one) power factor at the PCC to DG. The result is reduced load and energy loss in the DG. It is also possible to provide an autonomous mode of operation during the daytime [2, 3], stabilization of the load voltage [4]. Thus, improving the indicators of CU for systems with RES is an urgent task and contributes to the further development of energy with distributed sources of electricity.
Schematic solutions of single-phase converter units for combined electrical supply systems with a power active filter function are considered with 24-hour operation and taking into account the voltage variation of the photovoltaic solar battery and using the improved principle of inverter current generation with a fixed carrier frequency. The selection of the power circuit parameters, of the settings of the values of the carrier frequency and the deviation of a current are justified. A variable structure of the control system with a slave circuit of inverter output current and various external regulators for day, night and autonomous operation modes is proposed. Results of modeling for the system: "network -unit with serial connection of inverters with solar batteries -load" are given. References 7, figures 5, tables 2. 1 / 4
N2 s6Key words: combined electrical supply system, power active filter, photovoltaic solar battery, cascade circuit of a grid inverter, energy losses in switches.
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