DEVICE TO COMPENSATE HIGH HARMONICS AND CORRECT GRID POWER RATIO Russian patent published in 2012 - IPC H02J3/00 

FIELD: electricity.

SUBSTANCE: device comprises an inverter, an accumulating capacitor, an output smoothening passive filter and a control system controller, at the same time the control system controller is equipped with a sensor of filter current, a sensor of grid current, a voltage sensor, a pulse shaper on the basis of relay controllers with variable width of hysteresis, phase converters of current and voltage, a unit of phase synchronisation and a controller of accumulating capacitor voltage. The device makes it possible to increase the level of electric energy quality in the grid with non-linear load by means of a parallel active filter compensating higher harmonics of current and voltage using a forecasting logic during analysis of spectral composition of grid voltage and current and generation of a compensation current. The device is also capable of compensating a reactive power.

EFFECT: reduction of coefficients of distortion of grid current and voltage harmonicity, increased grid power ratio.

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