Modeling of current source inverter based on IGBT transistors with thermal models and PWM with selective harmonic elimination

THE PURPOSE. To develop and investigate a computer model of a three-phase two-level current inverter based on IGBT transistors with integrated thermal models. To create a switching system for inverter power switches based on pulse-width modulation with selective harmonic elimination (PWM-SHE) to solve the problem of the negative impact of higher-order harmonics on the industrial power supply network. The aim is to develop an automatic control system that allows switching between operating modes without stopping the power unit. METHODS. A computer simulation model was built in the MATLAB Simulink software package to study the proposed control system for a three-phase two-level current inverter. Real IGBT transistors from the Infineon company catalog were used as controlled power switches. The Selective Harmonic Elimination (SHE) method was applied using the iterative Newton-Raphson algorithm to calculate optimal switching angles for power switches. The control system is based on a fuzzy logic controller that provides automatic switching between different inverter operating modes. RESULTS. A control system has been developed that ensures automatic switching between operating modes depending on the temperature state of the power switches, the load current value, and the rate of temperature change of transistors. The switching system allows switching between the standard six-step mode and PWM-SHE modes with elimination of the 5th, 7th, and 11th harmonics without stopping the power unit. Three control channels are used for switching: by transistor temperature, by the derivative of temperature over time (heating rate intensity), and by load current. The system allows operation without changing the characteristics of the inverter power section. CONCLUSION. The developed control system for a three-phase two-level current inverter effectively solves the problem of the negative impact of harmonics on the power supply network using the SHE method. The system provides overload protection by automatically reducing the switching frequency when the temperature of the power switches increases, which prevents overheating of transistors and increases the service life of the power converter. The practical significance lies in the possibility of applying the developed system at industrial enterprises to improve power quality without additional capital expenditures on modernization of the inverter power section.

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