Power Conversion System Including Two Transformers with Two Secondary Windings, and Drive Chain Comprising Such a Conversion System

• US 20130336024A1
• Filed: 06/19/2013
• Published: 12/19/2013
• Est. Priority Date: 06/19/2012
• Status: Active Grant

• Current Assignee: GE Energy Power Conversion Technology Limited (General Electric Company)
• Original Assignee: GE Energy Power Conversion Technology Limited (General Electric Company)
• Inventors: Permuy, Alfred
• Granted Patent: US 9,042,130 B2
• Time in Patent Office: Days
• US Class Current: 363/37
• CPC Class Codes: H02M 1/126 using passive filters
• CPC Class Codes: H02M 5/44 using discharge tubes or semiconductor devices to convert the intermediate dc into ac
• CPC Class Codes: H02M 5/4505 having a rectifier with controlled elements
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements

Abstract

The power conversion system comprises:

• • a first transformer adapted to be connected to an AC network, the first transformer including a first primary winding and two first secondary windings, and
  • two power converters, each being connected to a first respective secondary winding.

The system further comprises a second transformer and a secondary electrical device, the second transformer including a second primary winding (30) and two second secondary windings, each second secondary winding being connected to a respective first secondary winding, and the secondary device being connected to the second primary winding.

Claims

1. A power conversion system comprising:

a first transformer adapted to be connected to an AC network, the first transformer including a first primary winding and two first secondary windings, and

two power converters, each being connected to a first respective secondary winding,

wherein the system further comprises a second transformer and a secondary electrical device, the second transformer including a second primary winding and two second secondary windings, each second secondary winding being connected to a respective first secondary winding, and the secondary electrical device being connected to the second primary winding.

2. The system according to claim 1, wherein the number of secondary windings of the first and second transformers is equal to 2.

3. The system according to claim 1, wherein the secondary electrical device includes a reduction filter for current harmonics that may be reinjected on the AC network.

4. The system according to claim 3, wherein the AC network has at least one phase, and the reduction filter includes, for the or each phase, an electromagnetic winding connected in series with a capacitor.

5. The system according to claim 1, wherein each power converter is a load commutated inverter.

6. The system according to claim 5, wherein each load commutated inverter includes a voltage rectifier and a voltage inverter connected at the output of the voltage rectifier using a DC bus, the DC bus including an electromagnetic coil.

7. The system according to claim 6, wherein the voltage rectifier and the voltage inverter each include a thyristor bridge.

8. A drive chain, comprising an electrical machine powered by an AC network by means of a power conversion system, the power conversion system being connected between the AC network and the electrical machine,

wherein the power conversion system is according to claim 1.