CONTROL DEVICE OF DEVIATIONS OF VOLTAGE AND REACTIVE POWER OF ELECTRIC NETWORK Russian patent published in 2012 - IPC H02J3/00 

FIELD: electricity.

SUBSTANCE: device allows controlling voltage deviation and reactive power in electric networks of industrial facilities for which frequent voltage falls of various strength are typical, due to frequent start-up of heavy-duty motors and load switching with various operating mode. Method is implemented as per application means of transformer with load voltage control device, the main inverter, valve device assembly with direct thyristor and return diode bridges included in the main inverter, input filter with current direction sensor included in the main inverter, synchronised and phased with network of output voltage phase control system of the main inverter relative to supply voltage, rectifier, synchronised with network frequency and phased with load voltage of control system of rectifier driven with network of inverter, which is synchronised with network frequency and phased with network voltage of control system, which is driven with network of inverter, assembly of individual control with rectifier and driven with network of inverter, load voltage deviation sensor, sensor of reactive power of network, automatic control unit of load voltage control device of transformer, which is synchronised and phased with load of phase control system of output voltage of the main inverter relative to load voltage, network voltage deviation sensor and synchronisation unit.

EFFECT: compliance of voltage level, value and duration of voltage deviation in AC network with norms of Russian and International standards for electrical power quality; improvement of network power coefficient.

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