VOLTAGE ADJUSTING APPARATUS

• US 20150333655A1
• Filed: 04/29/2015
• Published: 11/19/2015
• Est. Priority Date: 05/16/2014
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: MOCHIKAWA, Hiroshi, ARAI, Takuro, WATANABE, Yuji
• Granted Patent: US 9,571,002 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 3/1814 wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: Y02E 40/10 Flexible AC transmission systems [FACTS]

Abstract

In a voltage adjusting apparatus connected in series to a system, an output of an AC/DC converter thereof is reduced.

Provided are: a second serial transformer 21 having a primary side connected in series to a secondary side of a first serial transformer 13 having a primary side connected in series to the system and to a secondary side of a parallel transformer 14 having a primary side connected in parallel to the system; and a first AC/DC converter 22 having an AC side connected to a secondary side of the second serial transformer 21. The first AC/DC converter 22 has a switching element 22c connected between an AC terminal 22a and a DC terminal 22b, an antiparallel diode 22d, and a capacitor 22e.

Claims

1. A voltage adjusting apparatus comprising:

a second serial transformer having a primary side connected in series to a secondary side of a first serial transformer having a primary side connected in series to a system and to a secondary side of a parallel transformer having a primary side connected in parallel to the system; and

an AC/DC converter having an AC side connected to a secondary side of the second serial transformer.

2. The voltage adjusting apparatus according to claim 1, wherein

a polarity reversing switch is connected between the primary side of the second serial transformer and the secondary side of the parallel transformer.

3. The voltage adjusting apparatus according to claim 1, further comprising:

a second AC/DC converter having a DC side connected to a DC side of the AC/DC converter and an AC side connected to a secondary side or a third side of the parallel transformer.

4. The voltage adjusting apparatus according to claim 1, wherein

an inter-phase short-circuit switch is connected between the primary side of the second serial transformer and the secondary side of the parallel transformer.

5. The voltage adjusting apparatus according to claim 4, wherein

the short-circuit switch is a polarity reversing switch.

6. The voltage adjusting apparatus according to claim 1, wherein

an energy storage portion is connected to the DC side of the AC/DC converter.

7. The voltage adjusting apparatus according to claim 2, wherein

the polarity reversing switch uses a self arc-extinguishing device or a thyristor as a semiconductor device.

8. The voltage adjusting apparatus according to claim 2, further comprising:

a second AC/DC converter having a DC side connected to a DC side of the AC/DC converter and an AC side connected to a secondary side or a third side of the parallel transformer.