METHOD FOR REGULATING REACTIVE POWER WITH CONDENSER UNIT Russian patent published in 2021 - IPC H02M3/18 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and is intended for static compensators of reactive power in power supply systems. A method is proposed for controlling reactive power by a capacitor unit with three banks of capacitors, each of which is connected to the network by two thyristor switches and a mains switch. When each bank of capacitors is turned on, two phases are first turned on at the moment the line voltage of these two phases passes through zero, and then the third phase is turned on at the moment the phase voltage of this phase passes through zero. When each capacitor bank is disconnected, one phase is first disconnected naturally, in which the current passes through zero earlier, and then two phases are disconnected, the total current in which crosses zero. A distinctive feature of the method is that the capacity of the second capacitor bank is twice that of the first, and the capacity of the third capacitor bank is twice that of the second. The first stage of reactive power regulation is switched on by connecting the first capacitor bank to the network, the second stage of reactive power regulation is switched on by switching on the second capacitor bank when the first capacitor bank is disconnected, the third stage is switched on by connecting the first capacitor bank in parallel to the second capacitor bank, switching on the fourth control stage reactive power is produced by turning on the third capacitor bank when the first and second capacitor banks are disconnected, the fifth stage is turned on by connecting the first capacitor bank in parallel to the third capacitor bank, the sixth stage is turned on by connecting the second capacitor bank in parallel to the third capacitor bank when the first capacitor bank is disconnected, and the seventh stage of reactive power regulation is switched on by connecting the first battery capacitor banks in parallel to the second and third capacitor banks.

EFFECT: reducing the number of switching devices while maintaining the accuracy of the multi-stage reactive power control by the capacitor unit and in increasing the reliability of power supply systems.

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