METHOD OF CONTROLLING TWO-LEVEL THREE-PHASE VOLTAGE INVERTER Russian patent published in 2025 - IPC H02M7/53862 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and power electronics, namely to conversion of DC energy at the input to AC energy at the output using static converters, which require a continuous control signal. Method of controlling a two-level three-phase voltage inverter includes measuring the frequency of the network at the terminals of the two-level three-phase voltage inverter connected to the power system, taking into account which a voltage signal is generated, which is used to obtain a reactive power reference signal, which is separately summed up with a first reactive power setting to obtain a summed reactive power signal, and summed with output reactive power of virtual synchronous generator, obtaining resultant reference reactive power. Simulated mechanical power reference value is generated, which is used to generate virtual synchronous generator rotor speed signals and virtual synchronous generator rotor angle, and the digital signals of the measured currents and voltages at the outputs of the two-level three-phase voltage inverter for 23 mcs are converted from the three-phase coordinate system abc to the rotating coordinate system dq, thereby obtaining signals of currents and voltages, which are filtered and used to generate signals of output active and reactive power, output currents of the virtual synchronous generator and reference voltage in a rotating dq-coordinate system. Simultaneously, for 180 mcs, setting the frequency and active power setting to generate the simulated mechanical power signal, the first reactive power setting for generating the summed reactive power signal, second reactive power setting for generating a resultant flux linkage signal, and an additional active power setting for generating signals of virtual angle and rotor speed of the virtual synchronous generator. Simultaneously, the resultant flux linkage is formed, the virtual stator circuit in the rotating dq-coordinate system, and the flux linkage of the damper winding of the stator circuit is determined. Output active and reactive powers of the virtual synchronous generator are summed up with the previously summed reactive power signal and with the active power setting, respectively. Resultant reference values of active and reactive power, current and reference voltage value in the rotating dq-coordinate system are generated, using which signals of reference voltages for pulse-width modulation and control electric signals for bases of IGBT transistors in two-level three-phase voltage inverter are generated.

EFFECT: wider range of technical means allowing to damp oscillations of operating parameters of a two-level three-phase voltage inverter in electric networks with a low coefficient of short-circuit ratio.

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