Turbine driven power generating device having DC voltage intermediate circuit and star connected filter capacitors

• US 6,774,608 B2
• Filed: 09/19/2002
• Issued: 08/10/2004
• Est. Priority Date: 09/25/2001
• Status: Expired due to Fees

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: ABB Schweiz AG (ABB Limited)
• Inventors: Ronner, Beat, Golle, Ingo, Mullis, Martin, Hofstetter, Bruno
• Primary Examiner(s): Ponomarenko, Nicholas
• Assistant Examiner(s): Cuevas, Pedro J.
• Application Number:
  US10/246,451
• Publication Number:
  US 20030057923A1
• Time in Patent Office: 691 Days
• Field of Search: 322/17, 322/21-24
• US Class Current: 322/24
• CPC Class Codes: H02J 3/01 Arrangements for reducing harmonics or ripples
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 1/126 using passive filters
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements
• CPC Class Codes: H02P 9/105 for increasing the stability
• CPC Class Codes: Y02E 40/40 Arrangements for reducing harmonics

Abstract

A power generating device is specified, which comprises a generator (1), which is coupled to a drive unit, in particular to a turbine, and is connected via a rectifier (2) to a DC voltage intermediate circuit (3), an inverter (4), which is connected to the DC voltage intermediate circuit (3) and, on the AC voltage output side, has n phases with n AC voltage connections (5), and a filter arrangement (6), which is connected to the AC voltage connections (5). Furthermore, the filter arrangement (6) has a first filter inductance (7) and a second filter inductance (8), which is connected in series with the first, for each AC voltage connection (5), with a filter capacitor (9) being connected to the junction point of the first filter inductance (7) and the second filter inductance (8), and the filter capacitors (9) being connected to one another in a star circuit at a star point (10).

Claims

1. A power generating device comprising:

a generator, which is coupled to a drive unit, and is connected via a rectifier to a DC voltage intermediate circuit,

an inverter, which is connected to the DC voltage intermediate circuit and, on the AC voltage output side, has n phases with n AC voltage connections, and

a filter arrangement, which is connected to the AC voltage connections, wherein

the filter arrangement has a first filter inductance and a second filter inductance, which is connected in series with the first, for each AC voltage connection, and a filter capacitor is connected to the junction point of the first filter inductance and the second filter inductance, wherein the filter capacitors are connected to one another in a star circuit at a star point, wherein the star point is connected to ground potential, wherein a balancing apparatus is provided, which is connected to the DC voltage intermediate circuit and is formed from two series-connected controllable power semiconductor switches, each having a back-to-back parallel-connected diode, and wherein the junction point of the power semiconductor switches is connected to the star point.

2. The power generating device as claimed in claim 1, wherein the rectifier is in the form of a controllable three-phase rectifier.

3. The power generating device as claimed in claim 1, wherein the star point is connected to ground potential via a grounding capacitor.

4. The power generating device as claimed in claim 1, wherein the junction point of the power semiconductor switches is connected to the star point via a smoothing inductance.

5. The power generating device as claimed in claim 1, wherein the second filter inductance is connected to a first network isolating switch.

6. The power generating device as claimed in claim 1, wherein a charging device is provided, which is connected to the second filter inductance, with the charging device in each case having an isolating switch with a series-connected resistance for each connection for the second filter inductances.

7. The power generating device as claimed in claim 6, wherein the star point is connected to a second network isolating switch.

8. The power generating device as claimed in claim 1, wherein at least one further rectifier is connected to the DC voltage intermediate circuit, with the at least one further rectifier being connected to a further generator, and the further generator being coupled to a further drive unit.

9. The power generating device of claim 1, wherein the drive unit is a turbine.

10. The power generating device of claim 8, wherein the further drive unit is in the form of a turbine.