EP1499009A1
Expired / Lapsed
EP
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Control and protection of a doubly-fed induction generator system
Assignee: Siemens Gamesa Renewable Energy Innovation and Technology SL
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Filing: 2003-07-15
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Granted: —
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Expires: 2023-07-15
Abstract
Abstract A control system for a double-fed induction generator (DFIG) comprising a rotor (1) having rotor windings and a stator (2) having stator windings connectable to a grid for electric power distribution. The control system comprises a converter (170, 171), having a clamping unit comprising at least one passive voltage-dependent resistor element (291, 292, 293, 294) for providing a clamping voltage over the rotor windings when the clamping unit is triggered. The invention also relates to a double-fed induction generator (DFIG) system and to a method for protecting the converter in a power generation system.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 10:55
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/10; H02P9/102; F; F03; F03D; F03D9/00; F03D9/20; F03D9/25; F03D9/255; H02P6/00; H02P6/005; H02P9/007; H02P2101/00; H02P2101/15; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
206 words
A control system for a double-fed induction generator (DFIG) comprising a
rotor (1) having rotor windings and a stator (2) having stator windings connectable to a
grid for electric power distribution; said control system comprising a converter (170, 171), said converter
comprising the following components: a rotor-inverter (71-73) connectable to the rotor windings of the generator, a grid-inverter (74-76) connectable to the grid and/or to the stator windings, and a DC-link (77) for feeding the rotor-inverter; the converter (170, 171) further comprising a clamping unit (190) for protecting
the converter from damage due to over-currents in the rotor windings, said clamping
unit (190) being connectable over the rotor windings and arranged to be triggered from
a non-operating state to an operating state following detection of an over-current in the
rotor-windings, said clamping unit comprising a clamping element (290) arranged so
that when the clamping unit is in its non-operating state, currents in the rotor
windings cannot pass through said clamping element, and when the clamping unit is in its operating state, currents in the rotor windings
can pass through said clamping element, said clamping element comprising at least one passive voltage-dependent
resistor element (291, 292, 293, 294) for providing a clamping voltage over the rotor
windings.
Claim 2
Dependent Claim
27 words
A control system according to claim 1, wherein the clamping element (290)
comprises a plurality of passive voltage-dependent resistor elements (291, 292, 293,
294), arranged in parallel
Claim 3
Dependent Claim
23 words
A control system according to claim 1 or 2, wherein said at least one passive
voltage-dependent resistor element comprises at least one varistor.
Claim 4
Dependent Claim
24 words
A control system according to claim 1 or 2, wherein said at least one passive
voltage-dependent resistor element comprises at least one zener diode.
Claim 5
Dependent Claim
24 words
A control system according to claim 1 or 2, wherein said at least one passive
voltage-dependent resistor element comprises at least one suppression diode.
Claim 6
Dependent Claim
94 words
A control system according to any of the preceding claims, wherein the
clamping unit comprises, for each phase of the rotor, a connector (300) for connection
to the respective rotor phase, each connector being connected to a trigger branch
comprising, in series: a point of connection (297) of the clamping unit to the connector
(300) for connection to the respective rotor phase; a thyristor (295) for triggering the
clamping unit; the clamping element (290); a diode (296); and the point of connection
(297) to the connector (300) for connection to the respective rotor phase.
Claim 7
Dependent Claim
26 words
A control system according any of the preceding claims, wherein the
clamping unit further comprises a resistor (298) coupled in parallel with the clamping
element (290).
Claim 8
Dependent Claim
38 words
A control system according to any of the preceding claims, wherein the
clamping unit is arranged to be triggered from the non-operating state to the operating
state when the voltage over the DC-link rises above a pre-determined level.
Claim 9
Dependent Claim
37 words
A control system according to any of claims 1-7, wherein the clamping unit is
arranged to be triggered from the non-operating state to the operating state when the
voltage over the rotor-windings rises above a pre-determined level.
Claim 10
Dependent Claim
37 words
A control system according to any of claims 1-7, wherein the clamping unit
is arranged to be triggered from the non-operating state to the operating state when the
currents in the rotor-windings rise above a pre-determined level.
Claim 11
Dependent Claim
37 words
A control system according to any of claims 1-7, wherein the clamping unit
is arranged to be triggered from the non-operating state to the operating state when the
currents in the stator-windings rise above a pre-determined level.
Claim 12
Dependent Claim
79 words
A double-fed induction generator (DFIG) system comprising a rotor (1)
having rotor windings and a stator (2) having stator windings connectable to a grid for
electric power distribution, said double-fed induction generator system further
comprising a control system according to any of the preceding claims, wherein the
rotor inverter (71-73) is connected to the rotor windings of the generator,
the grid inverter (74-76) is connected to the grid, and
the clamping unit (190) is connected over the rotor windings.
Claim 13
Independent Claim
198 words
A method for protecting the converter in a power generation system
comprising a double-fed induction generator (DFIG) comprising a rotor (1) having rotor
windings, a stator (2) having stator windings connected to a grid for electric power
distribution and a control system comprising a converter (170, 171), said converter
comprising a rotor-inverter (71-73) connected to the rotor windings of the generator, a
grid-inverter (74-76) connected to the grid and/or to the stator windings, and a DC-link
(77) for feeding the rotor-inverter; whereby the method comprises the steps of: connecting a clamping unit (190) having a clamping element over the rotor
windings, said clamping unit comprising a clamping element (290) arranged so that
when the clamping unit is in a non-operating state, currents in the rotor windings
cannot pass through said clamping element, and when the clamping unit is in an
operating state, currents in the rotor windings can pass through said-clamping cement,
said clamping element comprising at least one passive voltage-dependent resistor
element (291, 292, 293, 294) for providing a clamping voltage over the rotor windings;
and triggering the clamping unit from its non-operating state to its operating state
when an over-current is detected in the rotor windings.
Claim 14
Dependent Claim
31 words
A method according to claim 13, wherein the clamping unit is triggered from
the non-operating state to the operating state when the voltage over the DC-link rises
above a pre-determined level.
Claim 15
Dependent Claim
31 words
A method according to claim 13, wherein the clamping unit is triggered from
the non-operating state to the operating state when the voltage over the rotor-windings
rises above a pre-determined level.
Claim 16
Dependent Claim
31 words
A method according to claim 13, wherein the clamping unit is triggered from
the non-operating state to the operating state when the currents in the rotor-windings
rise above a pre-determined level.
Claim 17
Dependent Claim
31 words
A method according to claim 13, wherein the clamping unit is triggered from
the non-operating state to the operating state when the currents in the stator-windings
rise above a pre-determined level.
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