Modular aggregation functions performed by static inverters in autonomous power supply systems

Abstract

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.