Reactive power compensator

摘要

A reactive power compensator for a three-phase network having first, second and third phases includes an assembly of capacitors and electromechanical contactors electrically connected to the capacitors. Each contactor includes at least one upstream and one downstream power terminal. An electric current circulates between the upstream and downstream power terminals when the contactors are closed. A first contactor is connected to the first phase and a second contactor is connected to the third phase. The voltage between the upstream and downstream power terminals of at least one electromechanical contactor is measured so that the electromechanical contactors can be controlled according to a control algorithm. The control algorithm includes the closure of a contactor for a substantially zero voltage between the upstream and downstream power terminals thereof, and the opening a contactor for a substantially minimum power value of the capacitors to which the contactor is connected.

主权项

1. A reactive power compensator for a three-phase network having a first phase, a second phase and a third phase, the compensator comprising:
an assembly of capacitors; at least two electromechanical contactors electrically connected to the assembly of capacitors, each contactor comprising at least one upstream power terminal and at least one downstream power terminal, an electric current circulating between the upstream and downstream power terminals in the closed position of the contactor, a first electromechanical contactor being configured to connect to the first phase and a second electromechanical contactor being configured to connect to the third phase; and circuitry configured to
measure the voltage between the upstream and downstream power terminals of at least one electromechanical contactor, andcontrol the electromechanical contactors according to a predetermined control algorithm, wherein the control algorithm includes closure of one of the first or second electromechanical contactors for a substantially zero voltage between the upstream and downstream power terminals thereof, and opening of another of the first or second electromechanical contactors for a substantially minimum power value of the capacitor or the capacitors to which the other of the first or second electromechanical contactor is connected, and wherein the circuitry is further configured to measure only the voltage between the upstream and downstream power terminals of the first electromechanical contactor, the closure of the first electromechanical contactor being determined on the basis of the voltage measured, closure of the second electromechanical contactor being determined as a function of the closure of the first electromechanical contactor with a predetermined time delay between the closure of the first electromechanical contactor and the closure of the second electromechanical contactor.