Ensuring design reliability of three phase parallel inverter with cut-off valves by improving the efficiency of its mathematical modeling

• Main Authors: Umarov, Shukhrat, Sapaev, Khushnud, Mirsaidov, Murakam, Ruzmatov, Abduvaxid
• Format: Conference Proceeding
• Language: English
• Subjects: Circuits; Electric potential; Equivalent circuits; Inverters; Mathematical analysis; Mathematical models; Matrices (mathematics); Phase current; Switching; Symmetry; Topology; Valves; Voltage
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0111343

In the article, on the basis of the operator method, a mathematical model for calculating transients in a three-phase current inverter with two-stage switching is proposed. The model allows you to calculate transients when the input voltage of the inverter changes, when the load changes, as well as when the input voltage and load change simultaneously. The design ratios underlying the model allow for software implementation without attracting large machine resources using standard material support, ensures the accuracy of the analysis within the capabilities of the machine, regardless of the size of the time step, as is inherent in various digital models of electrical circuits. It is shown that in the circuits of three-phase converters, due to the topological symmetry in phases, the same equivalent circuit, as a type, turns out to be valid and can be used to analyze processes with the same combination of switched on valves having different numbers. Therefore, operator equivalent circuits are drawn up for certain combinations of numbers of switched on valves and are used to calculate the process at the required stage for all phases, that is, all elements of the circuit. To facilitate the programming and calculation procedure, a universal correspondence matrix is proposed. This matrix can be used to calculate three-phase autonomous current inverters (ACI) of the following topologies: parallel ACI, parallel-serial ACI, series-parallel ACI, serial ACI, ACI with cut-off valves (ACI with CV) and ACI with two-stage switching.