ELEVATOR LINE BRIDGE FILTER FOR COMPENSATING REACTIVE POWER IN A GRID

摘要

The invention relates to a method and an electrical converter of an elevator. In the method a controller of the electrical converter determines a first reactive power produced by a smoothing filter using pre-determined information on impedance of the smoothing filter. The controller may also receive information on a second reactive power from a remote node over a communication channel, the second reactive power being produced to a grid. The controller adds the first reactive power and the second reactive power to yield a total reactive power. The controller requests the electrical converter to make a plurality of compensative connections in the converter matrix to compensate the first reactive power or the total reactive power.

主权项

1. A method, comprising:
determining, by a controller of an electrical converter, a first reactive power produced by a smoothing filter using pre-determined information on impedance of the smoothing filter, the smoothing filter being electrically connected via a three-phase electrical connection to a converter matrix of the electrical converter of an elevator, the smoothing filter being electrically connected via a three-phase connection to a grid, the converter matrix producing pulse width modulated three-phase output voltages to the smoothing filter; and requesting, by the controller, the electrical converter to make a plurality of first compensative electrical connections in the converter matrix to compensate the first reactive power.