PERMANENT MAGNET GENERATOR CONTROL

• US 20110037442A1
• Filed: 05/18/2007
• Published: 02/17/2011
• Est. Priority Date: 05/22/2006
• Status: Active Grant

• Current Assignee: The Switch Drive Systems Oy (American Superconductor Corporation), Semikron Elektronik GmbH & Company KG (Heilbronner Holding GbR)
• Original Assignee: Semikron Elektronik GmbH & Company KG (Heilbronner Holding GbR), Vertoco Limited
• Inventors: Schreiber, Dejan, Tormanen, Pasi
• Granted Patent: US 8,072,190 B2
• Time in Patent Office: Days
• 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), 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),

characterized in that

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.

2. The method as defined in claim 1, characterized in that the control converter circuit is controlled to supply current at short circuit conditions in addition to the generator short circuit current supply.

3. The method as defined in claim 1, characterized in that at short circuit conditions active power on the load side for the covering of converter power losses is attained from the remained load voltage.

4. The method as defined in claim 1, characterized in that A DC link capacitor (C_DC) is coupled on the converter DC side, and that at short circuit conditions active power on the load side for the covering of converter power losses is from the DC link capacitor which is dimensioned for power losses recovering for the time of short circuit duration.

5. 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),

characterized in that

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.

6. The system as defined in claim 5, characterized in that the control converter circuit is controlled to supply current at short circuit conditions in addition to the generator short circuit current supply.

7. The system as defined in claim 5, characterized in that the filter is a choke-capacitance filter structure (L1, Cf, L2).

8. The system as defined in claim 5, characterized in that the filtering circuit comprises only on L1 choke.

9. The system as defined in claim 5, characterized in that converter filter choke coupling is integrated in the generator windings (LG1, LG2, LG3) with a tap (TAP1) between the windings.

10. The system as defined in claim 5, characterized in that converter filter is totally integrated to the generator windings with no external filter means at the generator output.

11. The system as defined in claim 5, characterized in that the generator is a multiphase, preferably a three phase, PM generator with three phase stator windings.

12. The system as defined in claim 5, characterized in that the generator is a generator in a ship'"'"'s auxiliary power supply or a corresponding power supply connected to a ship'"'"'s engine, such as a diesel engine.

13. The system as defined in claim 5, characterized in that the converter bridge is a full-wave bridge with semiconductor switches (V1 to V6), and preferably with flywheel diodes (D1 to D6) connected in inverse-parallel with the semiconductor switches, and that the semiconductor switches V1 to V6 are controlled by means of a control unit (40).

14. The system as defined in claim 9, characterized in that converter filter is totally integrated to the generator windings with no external filter means at the generator output.