# US 8,541,899 B2 · Wind turbine generator system, control apparatus therefor, and control method therefor

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- Number: US 8,541,899 B2
- Document ID: US8541899B2
- Status: Granted
- Kind: B2
- Application number: 13/813,074
- Filed: 2012-02-24
- Published: 2013-08-29
- Granted: 2013-09-24
- Earliest claimed: 2012-02-24
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Akira Yasugi
- Inventors: Akira Yasugi
- Web page: https://patentgrep.com/patent/US8541899B2

## CPC

- F03D 7/0284: {in relation to the state of the electric grid}
- F03D 7/048: {controlling wind farms}
- H02J 3/381: {Dispersed generators}
- H02J 3/46: Controlling the sharing of generated power between the generators, sources or networks
- F05B 2270/335: Output power or torque
- H02J 2101/28: Wind energy
- H02J 2105/16: being internal to power sources or power generation plants
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- Y02E 10/76: Power conversion electric or electronic aspects
- F03D: WIND MOTORS
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

In a control apparatus for a wind turbine generator system, a wind turbine classifying unit classifies a plurality of wind turbines into a first wind turbine group that does not satisfy a rated wind speed condition and a second wind turbine group that satisfies the rated wind speed condition. A first controlling unit releases, for the wind turbines of the first wind turbine group, the output power reducing operation and causes the wind turbines of the first wind turbine group to perform an output power corresponding to a wind condition. A second controlling unit supplements a first deviation, which is a difference between a total output power of the first wind turbine group and a target output power, with an output power from the wind turbine of the second wind turbine group.

## Claims

### Claim 1

A control apparatus applied to a wind turbine generator system in which output powers of a plurality of wind turbines are supplied to a utility grid through a common connection point, the control apparatus for the wind turbine generator system comprising:
a wind turbine classifying unit for classifying, when an output power increase request is notified from the utility grid side during output power reducing operation, the plurality of the wind turbines into a first wind turbine group that does not satisfy a rated wind speed condition and a second wind turbine group that satisfies the rated wind speed condition;
a target setting unit for setting a target output power after reception of the output power increase request;
a first controlling unit for releasing, for the wind turbines of the first wind turbine group, the output power reducing operation and causing the wind turbines of the first wind turbine group to perform an output power corresponding to a wind condition; and
a second controlling unit for supplementing a first deviation, which is a difference between a total output power of the first wind turbine group and the target output power, with an output power from the wind turbine of the second wind turbine group.

### Claim 2 (depends on 1)

The control apparatus for the wind turbine generator system according to claim 1, wherein the second control unit includes:
a priority setting unit for setting priority for the wind turbines of the second wind turbine group on the basis of a wind condition; and
a output power command setting unit for setting output power commands for the wind turbines of the second wind turbine group such that an output power of the wind turbine having a high priority is higher than an output power of the wind turbine having a low priority.

### Claim 3 (depends on 2)

The control apparatus for the wind turbine generator system according to claim 2, wherein the output power command setting unit includes:
a requested output power changing unit for changing a requested output power set before the reception of the output power increase request to be increased;
a deviation calculating unit for calculating a second deviation, which is a difference between a total output power of the first wind turbine group obtained by multiplying the requested output power after the change with a number of the wind turbines of the first wind turbine group and the first deviation; and
a distributing unit for allocating the second deviation to the wind turbines in order from the wind turbine having the highest priority.

### Claim 4 (depends on 1)

The control apparatus for the wind turbine generator system according to claim 1, wherein the second control unit distributes the first deviation to the wind turbines of the second wind turbine group equally or on the basis of a weighting coefficient set for each of the wind turbines in advance and generates output power commands for the wind turbines.

### Claim 5 (depends on 1)

The control apparatus for the wind turbine generator system according to claim 1, wherein the wind turbine classifying unit receives numbers of rotor revolutions, wind turbine output powers, and pitch angles from the wind turbines and determines, using the received numbers of rotor revolutions, wind turbine output powers, and pitch angles, for each of the wind turbines, whether or not the wind turbine satisfies the rated wind speed condition.

### Claim 6 (depends on 1)

A wind turbine generator system comprising:
a plurality of wind turbines; and
the control apparatus for the wind turbine generator system according to claim 1.

### Claim 7

A control method applied to a wind turbine generator system in which output powers of a plurality of wind turbines are supplied to a utility grid through a common connection point, the control method for the wind turbine generator system comprising:
a wind turbine classifying step of classifying, when an output power increase request is notified during output power reducing operation, the plurality of the wind turbines into a first wind turbine group that does not satisfy a rated wind speed condition and a second wind turbine group that satisfies the rated wind speed condition;
a target setting step of setting a target output power after reception of the output power increasing request;
a first controlling step of releasing, for the wind turbines of the first wind turbine group, the output power reducing operation and causing the wind turbines of the first wind turbine group to perform an output power corresponding to a wind condition; and
a second controlling step of supplementing a first deviation, which is a difference between a total output power of the first wind turbine group and the target output power, with an output power from the wind turbine of the second wind turbine group.