US9041234B2
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US
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Double fed induction generator (DFIG) converter and method for improved grid fault ridethrough
Assignee: Rockwell Automation Technologies Inc
•
Filing: 2012-03-26
•
Granted: 2015-05-26
•
Expires: 2032-03-26
Abstract
Abstract A double fed induction generator (DFIG) converter method are presented in which rotor side current spikes are attenuated using series-connected damping resistance in response to grid fault occurrences or grid fault clearances.
Inventors
- 👤 Haihui Lu
- 👤 Zhenhuan Yuan
- 👤 Lixiang Wei
- 👤 Russel Kerkman
- 👤 Richard Lukaszewski
- 👤 Ahmed Mohamed Sayed Ahmed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:00
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/38; H02J3/381; F; F03; F03D; F03D7/00; F03D7/02; F03D7/022; F03D7/0224; F03D7/028; F03D7/0284; F03D7/0288; F03D7/04; F03D9/003; F03D9/00; F03D9/20; F03D9/25; F03D9/255; H02H; H02H7/00; H02H7/06; H02H7/10; H02H7/12; H02J3/386; H02P; H02P9/00; H02P9/006; H02P9/007; H02P9/10; H02P9/102; H02P9/48; H02H9/00; H02H9/001; H02H9/002; H02J2101/00; H02J2101/20; H02J2101/28; H02P2101/00; H02P2101/15; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72; Y02E10/723; Y02E10/76; Y02E10/763
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
377 words
A power conversion system for a double fed induction generator (DFIG), comprising: a rotor side converter comprising a plurality of AC connections coupleable to rotor leads of the DFIG and a plurality of DC connections coupled with a DC circuit, the rotor side converter comprising a rotor side rectifier circuit and a rotor side switching circuit, wherein the rotor side converter is operative when a rotor speed of the DFIG is above a nominal value to provide power from the rotor leads to the DC circuit using the rotor side rectifier circuit, and wherein the rotor side converter is operative when the rotor speed is below the nominal value to provide power from the DC circuit to the rotor leads using the rotor side rectifier circuit; a grid side converter comprising a plurality of DC connections coupled with the DC circuit and a plurality of AC connections coupleable to stator leads of the DFIG, the grid side converter comprises a grid side rectifier circuit and a grid side switching circuit, wherein the grid side converter is operative when the rotor speed is above the nominal value to provide power from the DC circuit to the stator leads using the grid side switching circuit, and wherein the grid side converter is operative when the rotor speed is below the nominal value to provide power from the stator leads to the DC circuit using the grid side rectifier circuit; a series damping apparatus coupled in series between the rotor leads of the DFIG and the grid side converter, the series damping apparatus comprising at least one series damping circuit including a series damping circuit resistance coupled in series between one of the rotor leads of the DFIG and the grid side converter, and a series damping switching circuit coupled in parallel with the series damping circuit resistance, the series damping switching circuit operative in a first mode to bypass the series damping circuit resistance to prevent current flow in the series damping circuit resistance and in a second mode to allow current to flow in the series damping circuit resistance; and a damping controller operative to control the mode of the series damping switching circuit based at least partially on a grid fault occurrence or a grid fault clearance.
Claim 2
Dependent Claim
377 words
A power conversion system for a double fed induction generator (DFIG), comprising: a rotor side converter comprising a plurality of AC connections coupleable to rotor leads of the DFIG and a plurality of DC connections coupled with a DC circuit, the rotor side converter comprising a rotor side rectifier circuit and a rotor side switching circuit, wherein the rotor side converter is operative when a rotor speed of the DFIG is above a nominal value to provide power from the rotor leads to the DC circuit using the rotor side rectifier circuit, and wherein the rotor side converter is operative when the rotor speed is below the nominal value to provide power from the DC circuit to the rotor leads using the rotor side rectifier circuit; a grid side converter comprising a plurality of DC connections coupled with the DC circuit and a plurality of AC connections coupleable to stator leads of the DFIG, the grid side converter comprises a grid side rectifier circuit and a grid side switching circuit, wherein the grid side converter is operative when the rotor speed is above the nominal value to provide power from the DC circuit to the stator leads using the grid side switching circuit, and wherein the grid side converter is operative when the rotor speed is below the nominal value to provide power from the stator leads to the DC circuit using the grid side rectifier circuit; a series damping apparatus coupled in series between the rotor leads of the DFIG and the grid side converter, the series damping apparatus comprising at least one series damping circuit including a series damping circuit resistance coupled in series between one of the rotor leads of the DFIG and the grid side converter, and a series damping switching circuit coupled in parallel with the series damping circuit resistance, the series damping switching circuit operative in a first mode to bypass the series damping circuit resistance to prevent current flow in the series damping circuit resistance and in a second mode to allow current to flow in the series damping circuit resistance; and a damping controller operative to control the mode of the series damping switching circuit based at least partially on a grid fault occurrence or a grid fault clearance.
Claim 3
Dependent Claim
46 words
The power conversion system of claim 1 , wherein the series damping apparatus comprises first and second series damping circuits individually coupled between a corresponding one of the rotor leads of the DFIG and a corresponding one of the AC connections of the rotor side converter.
Claim 4
Dependent Claim
64 words
The power conversion system of claim 2 , wherein the series damping apparatus comprises a plurality of series damping circuits individually coupled between a corresponding one of the rotor leads of the DFIG and a corresponding one of the AC connections of the rotor side converter, with a series damping circuit connected in series with each one of the rotor leads of the DFIG.
Claim 5
Dependent Claim
16 words
The power conversion system of claim 2 , wherein the series damping switching circuits are bidirectional.
Claim 6
Dependent Claim
75 words
The power conversion system of claim 2 , wherein the damping controller is operative to provide a damping control signal to the series damping apparatus to set the mode of the damping switching circuits, and wherein the damping controller provides the damping control signal to set the damping switching circuits to the second mode for a fixed time in response to a detected grid fault occurrence or in response to a detected grid fault clearance.
Claim 7
Dependent Claim
109 words
The power conversion system of claim 2 , wherein the damping controller is operative to provide a damping control signal to the series damping apparatus to set the mode of the damping switching circuits, and wherein the damping controller provides the damping control signal to set the damping switching circuits to the second mode for an adjustable time period in response to at least one of a detected grid fault occurrence and a detected grid fault clearance, and thereafter provides the damping control signal to set the damping switching circuits to the first mode based on at least one of a monitored stator and a monitored rotor current value.
Claim 8
Dependent Claim
39 words
The power conversion system of claim 1 , wherein the series damping apparatus comprises at least one series damping circuit coupled between the DC connections of the rotor side converter and the DC connections of the grid side converter.
Claim 9
Dependent Claim
39 words
The power conversion system of claim 7 , wherein the series damping apparatus comprises a plurality of series damping circuits coupled between the DC connections of the rotor side converter and the DC connections of the grid side converter.
Claim 10
Dependent Claim
19 words
The power conversion system of claim 7 , wherein the at least one series damping switching circuit is bidirectional.
Claim 11
Dependent Claim
19 words
The power conversion system of claim 1 , wherein the at least one series damping switching circuit is bidirectional.
Claim 12
Dependent Claim
81 words
The power conversion system of claim 2 , wherein the damping controller is operative to provide a damping control signal to the series damping apparatus to set the mode of the at least one damping switching circuit, and wherein the damping controller provides the damping control signal to set the at least one damping switching circuit to the second mode for a fixed time in response to a detected grid fault occurrence or in response to a detected grid fault clearance.
Claim 13
Dependent Claim
109 words
The power conversion system of claim 1 , wherein the damping controller is operative to provide a damping control signal to the series damping apparatus to set the mode of the damping switching circuits, and wherein the damping controller provides the damping control signal to set the damping switching circuits to the second mode for an adjustable time period in response to at least one of a detected grid fault occurrence and a detected grid fault clearance, and thereafter provides the damping control signal to set the damping switching circuits to the first mode based on at least one of a monitored stator and a monitored rotor current value.
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