SINGLE-PHASE ACTIVE ELECTRIC FILTER Russian patent published in 2012 - IPC G05F1/70 H02J3/18 H03H7/09 

FIELD: electricity.

SUBSTANCE: active electric filter comprises a system of input information conversion connected with an input of an error signal generation system synchronised with the grid. The output of the error signal generation system synchronised with the grid is connected to an inverter. The inverter output is connected to the input of a pulse-width modulator (PWM). An input of a buffer cascade is connected to the PWM output, the outputs of the buffer cascade are connected with inputs of a pulse power amplifier, and an input circuit of an LC-filter is connected to the output of the pulse power amplifier. Outputs of the LC-filter are connected to a phase of a supply grid. A single-phase active electric filter makes it possible to use cheap power modules on the basis of key MOSFET-transistors, best frequency properties of which make it possible to increase a clock frequency of PWM, to simplify output LC-filters, and therefore to improve the power quality.

EFFECT: reduced upper harmonic components in controlled points of a power system, compensation of a reactive power component, reduced weight and dimension indices of an active electric filter.

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