Hydro-quebec

Gerald Roberge

Pierre Pelletier

Leonard Bolduc

Momcilo Gavrilovic

Andre Doyon

A method and a system for interconnecting two electrical, alternating three phase networks operating asynchronously or synchronously at voltages of equal or adjacent frequencies, and in which, for corresponding phases, the voltages of the first and second networks are out of phase by a constant or varying angle. A plurality of three phase variable reactive impedances interconnect the two networks for carrying out a desired transfer of active power from one of the two networks to the other. The variable impedances are operated to establish between each phase of the first network and the three phases of the second network, three interconnections each having a different susceptance, which susceptances vary with the three phase variable reactive impedances. A regulator measures electrical parameters associated with at least one corresponding phase of the first and second networks, and operates the three phase variable reactive impedances to vary the susceptances of the interconnections in relation with the measured parameters so as to establish the desired transfer of active power from one of the first and second networks to the other network, while maintaining at a desired level a reactive power engaged in the transfer of active power.

Method and system for interconnecting two synchronous or asynchronous

Variable ratio transformer constructed around a control transformer comprising: two closed magnetic circuits each constructed around a ferromagnetic core. An alternating current magnetic field circulates in the first core and a direct current magnetic field circulates in the second core. The two circuits are located so as to define at least two common magnetic spaces in which the fields are superposed orthogonally. Around the first core is wound a primary winding, a secondary winding and, for a specific application in a three-phase circuit, a tertiary winding. A conventional transformer can be associated with the control transformer to reduce the load supported by the control transformer. The variable ratio transformer according to the invention can be used as a static balance compensator.

Variable ratio transformer and static balance compensator

The present invention relates to a variable inductor comprising a first closed magnetic circuit, formed of an anisotropic material, through which flows an alternative magnetic field, and a second closed magnetic circuit, also formed by an anisotropic material, through which circulates an adjustable direct current magnetic field. The first and second magnetic circuits are so disposed with respect to one another as to define at least two common magnetic spaces wherein the respective alternative and direct magnetic fields are orthogonally superimposed to orient the magnetic dipoles in the common spaces according to a direction predetermined by the intensity of the direct current magnetic field of the second circuit and thus to control the permeability of the first magnetic circuit to the alternative field. Arrangements for application of the variable inductance to monophase and three-phase circuits are proposed, which inductance may then operate in self-control with or without an inverse control.

Growing community of inventors

Repentigny, Canada

Gerald Roberge