Harmonic filter for magnetic amplifier

A magnetic amplifier that controls high-voltage power flow through power lines comprising

• a permeable core the permeable core comprising a plurality of legs;
• a power winding wound around a leg of the permeable core that receives high voltage alternating current from high voltage power lines and delivers an alternating load current to a load;
• and
• a plurality of control windings, each wound in parallel around a separate leg, spaced apart from each other and the power windings, and connected in series in an anti-symmetric relation about the permeable core such that substantially all of the biasing magnetic flux arising from a control current flowing through the plurality of control windings does not flow through the leg which the power winding is wound about;
• and
• a plurality of harmonic filters where each of the harmonic filters are positioned adjacent to only one of the plurality of control windings;
• where the of harmonic filters comprise tuned filters that attenuate even-ordered harmonics generated by an alternating load current passing through a portion of the permeable core;
• where a phasing of the plurality of control winding cancel out a voltage induced in the plurality of control windings caused by the alternating load current passing through the power windings.

A method of controlling high-voltage power flow through power lines comprising:

• winding a plurality of control windings around a plurality of parallel legs of a permeable core, each of the windings being wound around a separate leg, spaced apart from each other and connected in series in an anti-symmetric relation such that a biasing magnetic flux arising from a control current flowing through one of the plurality of control windings is substantially equal to the biasing magnetic flux flowing into a second of the plurality of control windings;
• filtering and attenuating even-ordered harmonics flowing through the legs in which the control windings encircle through a harmonic filter;
• phasing of the plurality of control windings to dampen or limit a voltage induced in the plurality of control windings caused by an alternating load current passing about a portion of the permeable core;
• and
• changing the reactance of the permeable core reactor by driving those portions of the permeable core that convey the biasing magnetic flux in the permeable core into saturation.

A method of controlling high-voltage power flow through power lines comprising:

• winding power windings that receives high voltage alternating current from a high voltage power line and delivers an alternating load current to a load about a permeable core;
• winding a plurality of control windings in parallel around a separate leg of the permeable core that are spaced apart from each other and a power winding and connected in series in an anti-symmetric relation around the permeable core such that substantially all of the biasing magnetic flux arising from a control current flowing through the plurality of control windings does not flow through the leg which the power winding is wound about;
• winding a harmonic filter winding adjacent to and symmetrical to each of the plurality of control windings, the harmonic filter windings configured to attenuate even-ordered harmonics passively;
• phasing of the plurality of control windings in such a way to cancel out a voltage induced in the plurality of control windings caused by the alternating load current passing through the power winding;
• and
• changing the reluctance of the permeable core and impedance of the power winding by driving only those portions of the permeable core that convey the biasing magnetic flux into saturation.

A non-superconductive saturable reactor for controlling power flow in a high voltage power line with large impedance gains comprising:

• a magnetizable core coupled to an ac and a dc flux path that flows through the magnetizable core;
• and
• a harmonic filter tuned to attenuate even-ordered harmonics generated by an alternating load current passing about a portion of the magnetizable core;
• wherein a bias dc winding wound in a split core leg of the magnetizable core creates local magnetic flux that saturates the magnetizable core only in that part that conveys the dc flux path, the saturation of part of the magnetizable core causes the saturation of a portion of the ac flux path.

A magnetic amplifier that controls high-voltage power flow through power lines comprising

• a permeable core;
• a power winding wound around the permeable core that receives high voltage alternating current from high voltage power lines and delivers an alternating load current to a load;
• and
• a plurality of control windings spaced apart from each other and the power windings, and connected in series in an anti-symmetric relation about the permeable core;
• and
• a harmonic filter configured to attenuate even-ordered harmonics generated by an alternating load current passing through a portion of the permeable core;
• where a phasing of the plurality of control winding cancel out a voltage induced in the plurality of control windings caused by the alternating load current passing through the power windings.