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Currently, passive L-shaped LC filters are widely used in static power converters. There are a lot of methods for calculating filter parameters, but they are complex. In addition, at the stage of experimental studies, it is necessary to refine the parameters to ensure required electromagnetic compatibility of the functional elements of the system. A simplified method for calculating the parameters of output and input filters of static electric power converters was developed. It can be used to evaluate the efficiency of converters. Filter calculations of AC and DC converters are not different, since the ripple coefficient and the harmonic coefficient are equal. The first one assesses quality of output voltage of AC converters, and the second one assesses quality of output voltage of DC converters. The method is based on the requirements ensuring minimum mass, continuity of current in the load, and high quality of output voltage. These requirements are met under conditions discussed in the article.

Static power inverters (SPI) are important functional elements to provide efficiency and reliability for autonomous power supply systems (APSS). The paper proposes to improve technical and economic characteristics of APSS through modular aggregation functions and reduced number of power electronic devices constituting SPIs. The paper provides a generalized SPC topology and insights into its performance. It deals with some electric schematic diagrams for a controlled rectifier and a three-phase modular inverter, a three-phase voltage inverter based on two single-phase inverters and a single-phase-three-phase rotating-field transformer, as well as a chain diagram for a universal modular static power inverter. It is shown that modular aggregation functions of APSS static power inverters will improve reliability through back-up operations performed by the main functional units and assemblies, and reduce time intervals for their maintenance and repair. The efficiency of autonomous systems will be advanced due to a decrease in the total number of power electronic devices constituting SPIs. In addition, the level of electromagnetic interference generated by these devices will decrease. A significant technical and economic effect will be achieved by using universal modular static inverters in the APS systems, capable of passing energy flows back and forth in both directions and operating in various modes.