METHOD FOR CONTROL OF THREE-PHASE VOLTAGE INVERTER WITH CURRENT STABILISATION AT TRANSFER TO OVERLOAD MODE Russian patent published in 2014 - IPC G05F1/625 

FIELD: electricity.

SUBSTANCE: invention relates to the field of electric engineering and power electronics. A method for control of a three-phase voltage inverter with current stabilisation at transfer to overload mode consists in generation of two preset signals for two load voltage orthogonal projections, the preset signal of overload current is shaped, the reference bidirectional signal is shaped, control signals are generated in two orthogonal projections against the preset signals and feedback signals, the control signals in two orthogonal projections are converted into three modulating signals in the temporary area, pulses are generated for control of the voltage inverter gates when the modulating voltage exceeds the reference voltage, phase current instantaneous values are measured for the voltage inverter, an amplitude of the generalised vector for phase currents is calculated for the voltage inverter and when it reaches the preset value, the preset overload voltage signal is corrected so that current equal to the overload current preset signal is generated for the load. Thus, in the overload mode load current stabilisation is provided at the level defined by the setting. At that smooth transition is ensured from the normal mode to the current limiting mode and vice a versa, i.e. regulators all the time operate in a linear mode (they are not limited), and only the voltage preset signal changes.

EFFECT: provision of smooth transition from the normal mode to the current limiting mode and back.

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