Wind Turbine Generation System

• US 20150001848A1
• Filed: 01/18/2012
• Published: 01/01/2015
• Est. Priority Date: 01/18/2012
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Ichinose, Masaya, Imaie, Kazuhiro
• Application Number:
  US14/372,949
• Publication Number:
  US 20150001848A1
• Time in Patent Office: Days
• US Class Current: 290/44
• CPC Class Codes: F03D 80/82 of electrical components
• CPC Class Codes: F03D 9/25 the apparatus being an electrical generator F03D9/22 takes precedence
• CPC Class Codes: F05B 2220/7068 equipped with permanent magnets
• CPC Class Codes: F05B 2260/76 the adjusting mechanism using auxiliary power sources
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02P 9/006 Means for protecting the generator by using control H02H7/06 takes precedence; control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10
• CPC Class Codes: H02P 9/102 for limiting effects of transients
• CPC Class Codes: H02P 9/105 for increasing the stability
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects

Abstract

An object of the present invention is to provide a Wind Turbine Generation System that eliminates the necessity of switching to a circuit different from the one used during a normal power generation operation even when Power grid voltage sags. To accomplish the above object, the Wind Turbine Generation System according to the present invention includes a wind turbine having blades rotating upon receipt of wind, a rotor connected to the blades, and a permanent magnet generator connected to the rotor, the permanent magnet generator generating electric power by rotating a rotator having a permanent magnet in accordance with the rotation of the rotor; auxiliary machinery and a wind turbine controller that control the wind turbine; a power converter that adjusts the electric power generated by the permanent magnet and supplies the adjusted electric power to the auxiliary machinery and to the wind turbine controller; a DC converter that is connected to the permanent magnet generator to convert AC power to DC power; and a control device that is connected to the DC converter to control the power converter by using the DC power obtained from conversion.

Claims

1. A Wind Turbine Generation System comprising:

a wind turbine having blades rotating upon receipt of wind, a rotor connected to the blades, and a permanent magnet generator connected to the rotor, the permanent magnet generator generating electric power by rotating a rotator having a permanent magnet in accordance with the rotation of the rotor;

auxiliary machinery and a wind turbine controller that control the wind turbine;

a power converter that adjusts the electric power generated by the permanent magnet and supplies the adjusted electric power to the auxiliary machinery and to the wind turbine controller;

a DC converter that is connected to the permanent magnet generator to convert AC power to DC power; and

a control device that is connected to the DC converter to control the power converter by using the DC power obtained from conversion.

2. The Wind Turbine Generation System according to claim 1,

wherein the DC converter is disposed between the permanent magnet generator and the power converter;

and

wherein DC power is applied to the power converter.

3. The Wind Turbine Generation System according to claim 1,

wherein the DC converter is a diode.

4. The Wind Turbine Generation System according to claim 1,

wherein the DC converter is a converter.

5. The Wind Turbine Generation System according to claim 4,

wherein the power converter is an inverter.

6. The Wind Turbine Generation System according to any one of claims 1, further comprising:

an inverter;

an LC filter that is connected to the inverter and provided with a coil and a capacitor;

a breaker connected to the LC filter; and

a transformer connected to the breaker;

wherein the high voltage side of the transformer is connected to a power grid system.

7. The Wind Turbine Generation System according to claim 6, further comprising:

an excitation generator; and

a converter that converts AC power generated by the excitation generator to DC power;

wherein the converter is connected to the inverter according to claim 6.

8. The Wind Turbine Generation System according to any one of claims 1,

wherein the wind turbine is a downwind wind turbine that generates electric power while the rotor is oriented downwind.