# US 10,767,634 B2 · Blade icing state identification method and apparatus for wind generator set

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- Number: US 10,767,634 B2
- Document ID: US10767634B2
- Status: Granted
- Kind: B2
- Application number: 15/741,912
- Filed: 2017-07-06
- Published: 2019-01-03
- Granted: 2020-09-08
- Earliest claimed: 2016-11-29
- Assignees: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd.
- Applicants: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd.
- Inventors: Jie Zhou; Chi Yu; Jianjun Yang
- Web page: https://patentgrep.com/patent/US10767634B2

## CPC

- F03D 17/00: Monitoring or testing of wind motors, e.g. diagnostics (testing during commissioning of wind motors F03D13/30)
- F03D 1/0675: {of the blades}
- F03D 3/005: {the axis being vertical}
- F03D 9/25: the apparatus being an electrical generator (F03D9/22 takes precedence)
- F03D 80/40: Ice detection; De-icing means
- F03D 7/047: {characterised by the controller architecture, e.g. multiple processors or data communications}
- F03D 7/048: {controlling wind farms}
- F05B 2270/32: Wind speeds
- F05B 2270/327: Rotor or generator speeds
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- Y02E 10/74: Wind turbines with rotation axis perpendicular to the wind direction
- 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

A blade icing state identification method and apparatus for a wind generator set are disclosed. The method includes setting a preset wind speed threshold and a preset rotating speed threshold, and setting the preset rotating speed threshold as a lower limit value of a maximum limited rotating speed of the wind generator set operating under a limited power condition; comparing a current wind speed and a current rotating speed of the wind generator set with the preset thresholds respectively; progressively increasing a blade icing possibility index when the current wind speed is greater than the preset wind speed threshold and the current rotating speed of the wind generator set is smaller than the preset rotating speed threshold, and otherwise, progressively decreasing the blade icing possibility index; and determining that blades are in an icing state when the blade icing possibility index is greater than a preset index.

## Claims

### Claim 1

A blade icing state identification method for a wind generator set, comprising:
presetting a wind speed threshold and a rotating speed threshold;
instructing a farm-level energy management platform or a wind farm controller to use the rotating speed threshold as a lower limit value of a maximum limited rotating speed of the wind generator set operating under a limited power condition;
periodically obtaining a current wind speed and a current rotating speed of the wind generator set;
comparing the current wind speed and the current rotating speed of the wind generator set with the preset wind speed threshold and the preset rotating speed threshold respectively;
progressively increasing a blade icing possibility index having a preset initial value when conditions that the current wind speed is greater than the preset wind speed threshold and the current rotating speed of the wind generator set is smaller than the preset rotating speed threshold are met;
progressively decreasing the blade icing possibility index when said conditions are not met; and
determining that blades are in an icing state when the blade icing possibility index is greater than a preset index, the preset index being a threshold for determining whether the blades are in the icing state,
wherein the preset rotating speed threshold is greater than a minimum rotating speed of the wind generator set.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
monitoring an external environment index of the wind generator set;
comparing the external environment index with a blade icing induction index of the wind generator set; and
presetting the wind speed threshold and the rotating speed threshold when it is determined that the external environment index is equal to the blade icing induction index.

### Claim 3 (depends on 1)

The method of claim 1, wherein the preset rotating speed threshold is greater than the minimum rotating speed of the wind generator set and is smaller than an intermediate value between the minimum rotating speed and a maximum rotating speed of the wind generator set.

### Claim 4 (depends on 1)

The method of claim 1, wherein the preset wind speed threshold is smaller than a wind speed value corresponding to a minimum torque of a constant rotating speed section in which the rotating speed is a preset maximum rotating speed in a torque-rotating speed characteristic curve of the wind generator set under the limited power condition.

### Claim 5 (depends on 1)

The method of claim 1, wherein the preset index is determined based on an updating period of the blade icing possibility index.

### Claim 6

A blade icing state identification apparatus for a wind generator set, comprising:
a processor;
a memory configured to store instructions executable by the processor; and
an interface configured to communicate with a farm-level energy management platform or a wind farm controller,
wherein the processor is configured to:
preset a wind speed threshold and a rotating speed threshold;
instruct, via the interface, the farm-level energy management platform or the wind farm controller to use the rotating speed threshold as a lower limit value of a maximum limited rotating speed of the wind generator set operating under a limited power condition;
periodically obtain a current wind speed and a current rotating speed of the wind generator set;
compare the current wind speed and the current rotating speed of the wind generator set with the preset wind speed threshold and the preset rotating speed threshold respectively;
progressively increase a blade icing possibility index having a preset initial value when conditions that the current wind speed is greater than the preset wind speed threshold and the current rotating speed of the wind generator set is smaller than the preset rotating speed threshold a met;
progressively decrease the blade icing possibility index when said conditions are not met; and
determine that blades are in an icing state when the blade icing possibility index is greater than a preset index, the preset index being a threshold for determining whether the blades are in the icing state,
wherein the preset rotating speed threshold is greater than a minimum rotating speed of the wind generator set.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the processor is further configured to monitor an external environment index of the wind generator set, compare the external environment index with a blade icing induction index, and preset the wind speed threshold and the rotating speed threshold when it is determined that the external environment index is equal to the blade icing induction index.

### Claim 8 (depends on 6)

The apparatus of claim 6, wherein the preset rotating speed threshold is greater than the minimum rotating speed of the wind generator set and is smaller than an intermediate value between the minimum rotating speed and a maximum rotating speed of the wind generator set.

### Claim 9 (depends on 6)

The apparatus of claim 6, wherein the preset wind speed threshold is smaller than a wind speed value corresponding to a minimum torque of a constant rotating speed section in which the rotating speed is a preset maximum rotating speed in a torque-rotating speed characteristic curve of the wind generator set under the limited power condition.

### Claim 10 (depends on 6)

The apparatus of claim 6, wherein the preset index is determined based on an updating period of the blade icing possibility index.