# US 2014/0152105 A1 · Output control device and output control method for wind farm

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0152105 A1
- Document ID: US20140152105A1
- Status: Published application
- Kind: A1
- Application number: 13/902,181
- Filed: 2013-05-24
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Akira YASUGI; Tsutomu KII; Mitsuya BABA; Yoshiaki HORI
- Web page: https://patentgrep.com/patent/US20140152105A1

## CPC

- H02J 3/381: {Dispersed generators}
- F03D 7/028: {controlling wind motor output power}
- F03D 7/048: {controlling wind farms}
- H02J 3/00: Circuit arrangements for AC mains or AC distribution networks
- H02J 3/46: Controlling the sharing of generated power between the generators, sources or networks
- H02J 13/181: the equipment comprising generators
- F05B 2270/309: Rate of change of parameters
- H02J 3/48: Controlling the sharing of active power
- H02J 2101/28: Wind energy
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- Y02E 10/76: Power conversion electric or electronic aspects
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- F03D: WIND MOTORS
- 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

An output control device for a wind farm which includes n number of wind turbines includes a WTG output obtaining unit for obtaining a current output Pi of each of the wind turbines; an extractable output calculation unit for calculating an extractable output Pmaxi for each of the wind turbines; a potential output calculation unit for calculating a potential output Ppoti of each of the wind turbines based on a difference between the extractable output Pmaxi and the current output Pi of each of the wind turbines; and a WTG output determination unit for determining an output command value of each of the wind turbines so that a total output PWF of the wind farm becomes closer to an output target value PWF*. The WTG output determination unit assigns an output increase amount to each of the wind turbines and to determine the output command value.

## Claims

### Claim 1

An output control device for a wind farm which includes n number of wind turbines, n being an integer of two or more, the output control device comprising:
a WTG output obtaining unit for obtaining a current output Pi of each of the wind turbines where i=1, . . . ,n;
an extractable output calculation unit for calculating an extractable output Pmaxi for each of the wind turbines where i=1, . . . ,n, the extractable output Pmaxi being energy extractable from wind energy;
a potential output calculation unit for calculating a potential output Ppoti of each of the wind turbines based on a difference between the extractable output Pmaxi and the current output Pi of each of the wind turbines where i=1, . . . ,n; and
a WTG output determination unit for determining an output command value of each of the wind turbines so that a total output PWF of the wind farm becomes closer to an output target value PWF*,
wherein the WTG output determination unit is configured to assign an output increase amount to each of the wind turbines based on the potential output Ppoti of each of the wind turbines and to determine the output command value based on the output increase amount, when the output target value PWF* of the wind farm is greater than the total output PWF of the wind farm.

### Claim 2 (depends on 1)

The output control device for the wind farm according to claim 1,
wherein the WTG output determination unit is configured to assign the output increase amount only to those wind turbines whose potential output Ppoti is greater than a threshold value Ppotth where Ppotth≧0.

### Claim 3 (depends on 1)

The output control device for the wind farm according to claim 1,
wherein the WTG output determination unit is configured to obtain the output command value for each of the wind turbines so that the output increase amount of each of the wind turbines is proportional to an amount of the potential output Ppoti.

### Claim 4 (depends on 1)

The output control device for the wind farm according to claim 1, further comprising:
a WTG output correction unit for correcting the output command value so that a sum of differences between the total output PWF and the output target value PWF* is at least partially compensated.

### Claim 5 (depends on 4)

The output control device for the wind farm according to claim 4,
wherein the WTG output correction unit is configured to correct the output command value only in a period excluding a transient period from a point when the output target value PWF* is updated to a point when the total output PWF reaches an updated value of the output target value PWF*.

### Claim 6 (depends on 4)

The output control device for the wind farm according to claim 4,
wherein the WTG output correction unit is configured to correct the output command value based on at least one of: the difference between the total output PWF and the output target value PWF*; a change rate of the total output PWF of the wind farm; a change rate of the current output Pi of each of the wind turbines where i=1, . . . ,n; a difference between the current output Pi of each of the wind turbines and a current output command value Pouti; and a change rate of a wind speed for each of the wind turbines.

### Claim 7 (depends on 1)

The output control device for the wind farm according to claim 1, further comprising:
an output change rate controller for controlling an output change rate of the total output PWF of the wind farm,
wherein the output change rate controller is configured to:
limit a change rate of the total output PWF of the wind farm to a first change rate in a transient period from a point when the output target value PWF* is updated to a point when the total output PWF reaches an updated value of the output target value PWF*; and
limit the change rate of the total output PWF of the wind farm to a second change rate in a period excluding the transient period, the second change rate being greater than the first change rate.

### Claim 8

An output control method for a wind farm which includes n number of wind turbines, n being an integer of two or more, the output control method comprising the steps of:
obtaining a current output Pi of each of the wind turbines, where i=1, . . . ,n;
calculating an extractable output Pmaxi for each of the wind turbines where i=1, . . . ,n, the extractable output Pmaxi being extractable energy from wind energy;
calculating a potential output Ppoti of each of the wind turbines based on a difference between the extractable output Pmaxi and the current output Pi of each of the wind turbines where i=1, . . . ,n; and
determining an output command value of each of the wind turbines so that a total output PWF of the wind farm becomes closer to an output target value PWF*,
wherein, in the step of determining the output command value, when the output target value PWF* of the wind farm is greater than the total output PWF of the wind farm, an output increase amount is assigned to each of the wind turbines based on the potential output Ppoti of each of the wind turbines and the output command value is determined based on the output increase amount.