The Inverter for autonomous power supply systems ............................................................................. 315

A functional diagram of an autonomous inverter and an algorithm for the operation of its automatic control system have been developed, using an intermediate high-frequency voltage conversion and a reversible rectifier converting its industrial frequency level. The proposed circuit design of the inverter increases the reliability of its operation and improves its weight and size indicators.

Introduction. Autonomous power supply systems operating on renewable energy sources use autonomous inverters (AI), which convert DC voltage into alternating current. An analysis of known structural solutions of AI showed that they have disadvantages: low reliability of operation due to the large number of power electronic devices, and accordingly increased weight and size indicators. A functional diagram of AI is proposed, where an intermediate high-frequency conversion of electricity is used, which has a reduced number of power electronic devices due to the transformer, the primary and secondary windings of which have midpoint terminals, the high-frequency voltage is converted to the industrial frequency level by a reversing rectifier. An algorithm for the operation of an automatic AI control system for voltage conversion and stabilization has been developed. The proposed AI circuit solutions made it possible to increase the reliability of the inverter and improve its weight and size characteristics. The purpose of the study is to develop a functional diagram of an autonomous inverter with improved reliability indicators and weight and size indicators, as well as an algorithm for the operation of its automatic control system.

The object of research: structural and functional circuits of autonomous inverters.

Materials and methods. During the research, methods of theoretical foundations of electrical engineering, power electronic converter technology and methods of statistical information processing were used Results and conclusions. The developed structural and circuit solution for converting a DC voltage into a sinusoidal AC voltage, made using an intermediate high-frequency conversion, has improved reliability and weight and size indicators in comparison with known AI technical solutions, by reducing the number of electronic devices in the power part of the converter and simplifying the control circuit.

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