DEVICE TO COMPENSATE HIGH HARMONICS AND CORRECT GRID ASYMMETRY Russian patent published in 2016 - IPC H02J3/01 H02J3/26 

FIELD: electricity.

SUBSTANCE: device intended to compensate higher harmonics and grid asymmetry 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 controller of the control system is equipped with a unit detecting components of negative- and zero-sequence currents and phase correction unit for asymmetric current components, at that input of the unit detecting components of negative- and zero-sequence currents is connected to output of grid current sensor, while output of the unit detecting components of negative- and zero-sequence currents is coupled to input of the phase correction unit for asymmetric current components, which is also connected to output of the phase synchronisation unit, at that output of the phase correction unit for asymmetric current components is coupled to input of the pulse shaper.

EFFECT: reduced distortion factor in sinusoidal shape of the grid current and voltage curves.

1 dwg