Thyristor linked inductor

• US 20020050829A1
• Filed: 08/22/2001
• Published: 05/02/2002
• Est. Priority Date: 08/29/2000
• Status: Abandoned Application

• Current Assignee: University of Alberta
• Original Assignee: University of Alberta
• Inventors: Xu, Wilsun
• Application Number:
  US09/933,897
• Publication Number:
  US 20020050829A1
• Time in Patent Office: Days
• US Class Current: 324/654
• CPC Class Codes: H01F 29/02 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
• CPC Class Codes: H02J 3/1864 wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
• CPC Class Codes: Y02E 40/10 Flexible AC transmission systems [FACTS]

Abstract

A thyristor linked inductor is formed by a plurality of inductor segments connected in series, each inductor segment including a coil, a first switch in series with the coil, a shunt for by-passing the coil and a second switch for controlling the shunt. It is important that each of the first and second switches in each inductor segment be formed by a pair of thyristors connected in anti-parallel relationship.

Claims

1. A thyristor linked inductor comprising a plurality of inductor segments connected in series, each said inductor segment including a coil, a first switch means in series with said coil, a shunt means for by-passing said coil and a second switch means for activating and deactivating said shunt means, each of said first and second switch means comprising a pair of thyristors connected in anti-parallel relationship.

2. A thyristor linked inductor as defined in claim 1 wherein said coil of each inductor segment is mount on a core common to other coils of other of said inductor segments.

3. A thyristor linked inductor as defined in claim 2 wherein said core is an iron core

4. A thyristor linked inductor as defined in claim 1 wherein each said inductor segment has a pair of first switch means position one on each side of its said coil, said shunt means comprising a pair of shunts each incorporating a second switch means, one shunt of said pair of shunts being connected at its one end between said coil and one of said pair of first switch means and at its opposite end at the side of the other of said pair of first switch means remote from said coil and the other shunt of said pair of shunts being connected at its one end between said coil and said other of said pair of first switch means and at its opposite end at the side of said one of said pair of first switch means remote from said coil.

5. A thyristor linked inductor as defined in claim 4 wherein said coil of each inductor segment is mount on a core common to other coils of other of said inductor segments.

6. A thyristor linked inductor as defined in claim 5 wherein said core is an iron core

7. A series reactive power compensator comprising a variable inductor connected in series with a capacitor

8. A series reactive power compensator as defined in claim 7 connected in parallel with a fluctuating load.

9. A series reactive power compensator as defined in claim 7 wherein said variable inductor is thyristor linked inductor.

10. A series reactive power compensator as defined in claim 8 wherein said variable inductor is thyristor linked inductor.