Permanent magnet generator control

• US 8,072,190 B2
• Filed: 05/18/2007
• Issued: 12/06/2011
• Est. Priority Date: 05/22/2006
• Status: Expired due to Fees

• Current Assignee: The Switch Drive Systems Oy (American Superconductor Corporation), Semikron Elektronik GmbH & Company KG (Heilbronner Holding GbR)
• Original Assignee: The Switch High Power Converters Oy (Yaskawa Electric Corporation)
• Inventors: Schreiber, Dejan, Törmänen, Pasi
• Primary Examiner(s): Leung, Quyen
• Assistant Examiner(s): Kim, John K
• Application Number:
  US12/301,763
• Publication Number:
  US 20110037442A1
• Time in Patent Office: 1,663 Days
• Field of Search: 322/24, 322/28, 322/44, 322/59, 322/89, 310/189, 310/200
• US Class Current: 322/44
• CPC Class Codes: H02M 1/126 using passive filters
• CPC Class Codes: H02M 7/219 in a bridge configuration
• CPC Class Codes: H02P 9/00 Arrangements for controlling electric generators for the purpose of obtaining a desired output Ward-Leonard arrangements H02P7/34; vector control H02P21/00; feeding a network by two or more generators H02J; for charging batteries H02J7/14

Abstract

A method of and a system for controlling a permanent magnet AC generator (10), wherein the generator is provided with stator windings and permanent magnets in the rotor and wherein the generator is connected to a drive unit (50), wherein the generator is further provided with a semiconductor converter provided with AC output connected to the generator output and a DC link for controlling the output voltage of the generator, and the converter is further provided with filter means for filtering the output of the converter so that a filtered output of the converter is fed to the generator output.

Claims

1. A method of controlling a permanent magnet AC generator (10) in a power supply system, wherein the generator is provided with stator windings and permanent magnets in a rotor, and wherein the generator is connected to a drive unit (50),

the method comprising the steps of:

controlling an output voltage of the AC generator (10) with a semiconductor converter (30) having an AC output connected to an output of the AC generator (10) and a DC link capacitor (C_DC) for controlling an output voltage of the AC generator (10), and

filtering an output voltage of the converter with filter means (20) so that an output voltage of the converter (30) fed to the AC generator (20) is filtered,

wherein a converter filter choke coupling is integrated in windings (LG1, LG2, LG3) of the generator with taps (TAP1) between the windings,

wherein the filter means (20) is totally integrated inside the generator, and none of the filter means (20) is disposed external of the generator.

2. The method as defined in claim 1, wherein the converter (30) includes circuits which are controlled to supply current at short circuit conditions to add to a supply of the current from the generator.

3. The method as defined in claim 1, wherein at short circuit conditions, further comprising:

attaining active power on a load side of the converter (30) for covering of converter power losses from a remaining load voltage.

4. The method as defined in claim 1, further comprising:

coupling the DC link capacitor (C_DC) on a DC side (80) of the converter, and,

at a time of a short circuit condition, providing active power on a load side (70) of the converter (30) from the DC link capacitor (C_DC) for covering a loss of power of the converter,

wherein the DC link capacitor (C_DC) is dimensioned for recovering the loss of power during a duration of the short circuit condition.

5. A system for controlling a permanent magnet AC generator (10) having stator windings (LG1, LG2, LG3) and permanent magnets in rotor thereof, the generator (10) being connected to a drive unit (50),

wherein the system includes:

a semiconductor converter (30) provided with an AC output connected to an output of the generator (10) and a DC link capacitor (C_DC) for controlling an output voltage of the AC generator (10), and

filter means (20) for filtering an output of the converter (30), so that an output of the converter (30) fed to the AC generator (10) is filtered,

wherein a converter filter choke coupling is integrated in windings (LG1, LG2, LG3) of the generator with taps (TAP1) between the windings,

wherein the filter means (20) is totally integrated inside the generator, and none of the filter means (20) is disposed external of the generator.

6. The system as defined in claim 5, wherein circuits of the converter (30) are controlled to supply current at short circuit conditions to add to a supply of current from the generator.

7. The system as defined in claim 5, wherein the generator is a three phase permanent magnet generator.

8. The system as defined in claim 5, wherein an opposite end of each of the three chokes (L1) is directly connected to the tap (TAP1) associated with each of three phases of the generator.

9. The system as defined in claim 5, wherein the converter (30) is a full-wave bridge with semiconductor switches (V1 to V6), with flywheel diodes (D1 to D6) connected in inverse-parallel with the semiconductor switches (V1 to V6), and

wherein the semiconductor switches (V1 to V6) are controlled by means of a control unit (40).