Variable speed wind turbine having a matrix converter
First Claim
Patent Images
1. A variable speed wind turbine comprising:
- a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
a voltage gradient limiting circuit located between the matrix converter and the generator rotor.
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Abstract
A variable speed wind turbine is disclosed comprising a turbine rotor that drives a doubly-fed induction generator, a matrix converter which converts variable frequency output into constant frequency output, and a control unit and a protection circuit for the matrix converter. Power is circulated in the system allowing for sensorless detection of rotor position and better output ratios of power from the system.
133 Citations
192 Claims
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1. A variable speed wind turbine comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
a voltage gradient limiting circuit located between the matrix converter and the generator rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements, the matrix converter having an input potential and an output potential;
a matrix converter control unit for controlling the switching elements;
a transformer having at least three windings including a tertiary winding; and
means for adjusting voltage at the tertiary winding, wherein a ratio of the input potential to the output potential is greater than 0.866. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith, the generator having a winding ratio;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
means for adjusting the winding ratio of the generator wherein a reduced matrix converter gain is overcome, wherein a ratio of the input potential to the output potential is greater than 0.866 and whereby a current rating of the switching elements is increased. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
a protection circuit for protecting the matrix converter against over voltages. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
a protection circuit for protecting the matrix converter against over voltages and for retaining control after a grid disruption. - View Dependent Claims (66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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81. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
means for position sensorless detection of the position of said turbine rotor. - View Dependent Claims (82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96)
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97. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
a power controller for circulating reactive energy. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112)
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113. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
a power controller for controlling the power factor of the turbine without impacting the circulation of reactive power. - View Dependent Claims (114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128)
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129. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements; and
a matrix converter control unit to control the switching elements, wherein at least one of said switching elements comprises a standard H-Bridge module. - View Dependent Claims (130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144)
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145. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements;
a matrix converter control unit to control the switching elements; and
wherein said stator further includes a stator winding means for shifting between a Y-connection and a Δ
-connection. - View Dependent Claims (146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160)
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161. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements; and
a matrix converter control unit to control the switching elements, which further includes a means for the facilitating the active damping of current harmonics. - View Dependent Claims (162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176)
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177. A variable speed wind turbine, comprising:
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a turbine rotor including at least one blade mounted to a rotatable turbine shaft;
a doubly-fed induction generator having a stator and a rotor coupled to the turbine shaft for rotation therewith;
a matrix converter including an array of switching elements; and
a matrix converter control unit to control the switching elements;
which further includes a means for facilitating the active damping of resultant drive-train oscillations. - View Dependent Claims (178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192)
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Specification