A wind power generation system

A technology of wind power generation system and power system, which is applied in the direction of wind power generation, wind power engine, wind power motor combination, etc., and can solve problems such as blade over-rotation and speed increase

Active Publication Date: 2013-04-03
HITACHI IND PROD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] If the power converter trips or stops power generation due to an abnormal temperature of the power converter, the input energy of the wind power genera

Method used

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  • A wind power generation system
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Examples

Experimental program
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Embodiment 1

[0095] In this embodiment, an example of the wind power generation system 1 in which the power converter is cooled by cooling water will be described.

[0096] The wind power generation system 1 of this embodiment converts wind energy into electric power with a generator including blades and permanent magnets, and converts the electric power into a commercial frequency with a power converter to transmit electric power to an electric power system.

[0097] figure 1 A configuration example of the wind power generation system 1 of this embodiment is shown.

[0098] The wind power generation system 1 is provided with: a blade 10 that converts wind energy into rotational energy, a hub 11 that supports the blade and transmits the rotational force of the blade to a shaft, a shaft 13 that transmits the rotational force to a gear 14, and is mechanically connected to the gear. A generator 15 that converts rotational energy into electrical energy, a power converter 20 that converts the ...

Embodiment 2

[0157] In this embodiment, an example of the wind power generation system 1 in which the cooling capacity is detected from the internal temperature of the power converter will be described.

[0158] Figure 11 It is an example of a configuration diagram showing the wind power generation system 1 of the first embodiment.

[0159] for with figure 1 The wind power generation system 1 has been explained figure 1 The description of the parts with the same functions assigned to the same symbols will be omitted.

[0160] The difference between the present embodiment and the wind power generation system described in the first embodiment is that the temperature sensor 200 is installed in the frame housing the converter 21 and the inverter 22 of the power converter 20 .

[0161] In Embodiment 1, the temperature of the cooling water is detected directly or indirectly through ambient temperature detection to detect the decrease in the cooling capacity of the cooling system 3 that cools...

Embodiment 3

[0175] In this embodiment, an example of the wind power generation system 1 in which the cooling capacity is detected from the internal temperature of the power converter will be described.

[0176] Figure 13 It is an example of a configuration diagram showing the wind power generation system 1 of the first embodiment.

[0177] for with figure 1 The wind power generation system 1 has been explained figure 1 The components shown with the same symbols have the same functions, and their descriptions are omitted.

[0178] The difference between this embodiment and the wind power generation system described in Embodiment 2 is that the temperature sensor 200 is provided on the cooling fin of the semiconductor element of the power converter 20 .

[0179] In a water-cooled power converter, when the thermal time constant of the cooling fin is short and the cooling capacity of the cooling system 3 decreases, the junction temperature of the semiconductor element exceeds the allowable...

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PUM

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Abstract

A wind power generation system is provided. The system controls generated power of a generator via an electric power converter. When the electric power transmitted by the electric power converter is limited because the reduced cooling capability performing cooling on the electric power converter, variable control can be performed by the angle of pitch of blades so that input energy from the blades corresponding to the electric power which can be transmitted is controlled. Over rotation of the blades and faults of the electric power converter can be prevented. The system comprises cooling capability to the cooling system or comprises a transverter, a cooling capability detecting portion detecting the cooling state of the electric converter of the inverter, and an angle of pitch instruction correcting portion correcting the angle of pitch instruction via an angle of pitch instruction calculating portion. According to the detected result of the cooling capability detecting portion, the angle of pitch instruction correcting portion corrects the angle of pitch instruction and executes variable control instruction on the angel of pith of the blades according to the corrected angle of pitch instruction.

Description

technical field [0001] The present invention relates to a wind power generation system that uses a generator to generate power from input energy based on wind power in connection with a power system, converts the generated power into desired power using a power converter, and transmits the power to the power system. Background technique [0002] In recent years, in order to improve the power generation efficiency of a wind power generation system, a variable speed wind power generation system in which a generator is operated at a variable speed using a power converter called an inverter or a converter has become mainstream. [0003] The energy transmission part of the variable speed windmill system includes: a blade that converts wind energy into rotational energy, a shaft that transmits the rotational energy obtained through the blade to a gear as a speed increaser, a gear that is mechanically connected to the shaft, and a gear that is connected to the gear A generator that...

Claims

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Application Information

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IPC IPC(8): H02P9/04F03D7/02F03D9/00
CPCY02E10/72
Inventor 伊藤智道一濑雅哉清藤康弘楠野顺弘
Owner HITACHI IND PROD LTD
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