# US 2021/0340951 A1 · Method and device for detecting active power of wind turbine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0340951 A1 - Document ID: US20210340951A1 - Status: Published application - Kind: A1 - Application number: 16/339,207 - Filed: 2018-04-11 - Published: 2021-11-04 - Earliest claimed: 2017-12-19 - Assignees: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. - Applicants: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. - Inventors: Mengting YU; Guilin ZHOU; Mei HAN - Web page: https://patentgrep.com/patent/US20210340951A1 ## CPC - F03D 7/028: {controlling wind motor output power} - F03D 17/00: Monitoring or testing of wind motors, e.g. diagnostics (testing during commissioning of wind motors F03D13/30) - F03D 7/043: {characterised by the type of control logic} - F03D 9/255: {connected to electrical distribution networks; Arrangements therefor} - F05B 2270/1033: Power (if explicitly mentioned) - F05B 2270/32: Wind speeds - F05B 2270/327: Rotor or generator speeds - F05B 2270/328: Blade pitch angle - F05B 2270/335: Output power or torque - 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 ## Abstract A method and a device for detecting an active power of a wind turbine. The method includes: acquiring a current rotation speed of a rotor of a wind turbine and a current outputted active power; determining an effective wind speed of the wind turbine; determining a maximum active power capable to be captured by the wind turbine at the current rotation speed; determining a maximum active power capable to be outputted by the wind turbine, and determining a release power at which the wind turbine is capable to release a rotation kinetic energy of the wind turbine for a predetermined time at the current rotation speed; and determining the available active power of the wind turbine, based on the maximum active power capable to be outputted, the release power, and the current outputted active power. ## Claims ### Claim 1 A method for detecting an available active power of a wind turbine, comprising: acquiring a current rotation speed of a rotor of a wind turbine and a current outputted active power of the wind turbine; determining an effective wind speed of the wind turbine, based on the current rotation speed and the current outputted active power; determining a maximum active power capable to be captured by the wind turbine at the current rotation speed, based on the effective wind speed and a maximum utilization-rate coefficient for wind energy of the wind turbine at the current rotation speed; determining a maximum active power capable to be outputted by the wind turbine, based on the maximum active power capable to be captured and a corresponding power loss, and determining a release power, at which the wind turbine is capable to release rotation kinetic energy of the wind turbine for a predetermined time at the current rotation speed; and determining the available active power of the wind turbine, based on the maximum active power capable to be outputted, the release power, and the current outputted active power. ### Claim 2 (depends on 1) The method according to claim 1, wherein determining the effective wind speed of the wind turbine comprises: determining a current tip speed ratio of the wind turbine, based on the current rotation speed and the current outputted active power; and determining the effective wind speed of the wind turbine, based on the current tip speed ratio and the current rotation speed. ### Claim 3 (depends on 2) The method according to claim 2, wherein determining the current tip speed ratio of the wind turbine comprises: determining, based on the current rotation speed and the current outputted active power, a relationship value indicating a predetermined relationship between a utilization-rate coefficient for wind energy of the wind turbine and a tip speed ratio of the wind turbine; and obtaining the current tip speed ratio of the wind turbine, based on a current pitch angle of the wind turbine and the determined relationship value. ### Claim 4 (depends on 3) The method according to claim 3, wherein obtaining the current tip speed ratio of the wind turbine comprises: acquiring one or more combinations of the utilization-rate coefficient for wind energy and the tip speed ratio, corresponding to the current pitch angle, from a predetermined relationship table, wherein the predetermined relationship table records a mapping relationship among the tip speed ratio, a pitch angle and the utilization-rate coefficient for wind energy; obtaining a combination of which another relationship value indicating the predetermined relationship is closest to the determined relationship value, from the acquired one or more combinations of the utilization-rate coefficient for wind energy and the tip speed ratio; and taking a tip speed ratio of the obtained combination as the current tip speed ratio. ### Claim 5 (depends on 3) The method according to claim 3, wherein the predetermined relationship is a ratio of the utilization-rate coefficient for wind energy of the wind turbine to a cube of the tip speed ratio of the wind turbine. ### Claim 6 (depends on 2) The method according to claim 2, wherein the maximum utilization-rate coefficient for wind energy is obtained by: obtaining one or more utilization-rate coefficients for wind energy corresponding to the current tip speed ratio, from a predetermined relationship table, wherein the predetermined relationship table records a mapping relationship between a tip speed ratio, a pitch angle, and a utilization-rate coefficient for wind energy; taking a largest utilization-rate coefficient for wind energy among the obtained one or more utilization-rate coefficients for wind energy as the maximum utilization-rate coefficient for wind energy. ### Claim 7 (depends on 1) The method according to claim 1, wherein determining the available active power of the wind turbine comprises: calculating a sum of the maximum active power capable to be outputted and the release power, and subtracting the current outputted active power from the calculated sum. ### Claim 8 (depends on 1) The method according to claim 1, wherein the predetermined time is a length of time during which the wind turbine is required to keep an output power in a rising state in primary frequency regulation. ### Claim 9 (depends on 1) The method according to claim 1, wherein the release power meets a condition, and the condition is that the wind turbine is operable at a speed greater than a switching-in speed for grid-connection of the wind turbine after releasing, at the release power, the rotation kinetic energy of the wind turbine for the predetermined time at the current rotation speed. ### Claim at position 10 10-18. (canceled) ### Claim 19 A system for detecting an available active power of a wind turbine, wherein the system comprises: a processor; and a memory storing a computer program, wherein: the computer program when executed by the processor configures the system to: acquire a current rotation speed of a rotor of a wind turbine and a current outputted active power of the wind turbine; determine an effective wind speed of the wind turbine and a current rotation speed and the current outputted active power; determine a maximum active power capable to be captured by the wind turbine at the current rotation speed, based on the effective wind speed and a maximum utilization-rate coefficient for wind energy of the wind turbine at the current rotation speed; determine a maximum active power capable to be outputted by the wind turbine, based on the maximum active power capable to be captured and a corresponding power loss, and determine a release power, at which the wind turbine is capable to release rotation kinetic energy of the wind turbine for a predetermined time at the current rotation speed; and determine the available active power of the wind turbine, based on the maximum active power capable to be outputted, the release power, and the current outputted active power. ### Claim 20 (depends on 1) A computer readable storage medium storing a computer program, wherein the computer program when executed performs the method according to claim 1. ### Claim 21 (depends on 19) The system according to claim 19, wherein the computer program when executed by the processor further configures the system to: determine a current tip speed ratio of the wind turbine, based on the current rotation speed and the current outputted active power; and determine the effective wind speed of the wind turbine, based on the current tip speed ratio and the current rotation speed. ### Claim 22 (depends on 21) The system according to claim 21, wherein the computer program when executed by the processor further configures the system to: determine, based on the current rotation speed and the current outputted active power, a relationship value indicating a predetermined relationship between a utilization-rate coefficient for wind energy of the wind turbine and a tip speed ratio of the wind turbine; and obtain the current tip speed ratio of the wind turbine, based on a current pitch angle of the wind turbine and the determined relationship value. ### Claim 23 (depends on 22) The system according to claim 22, wherein the computer program when executed by the processor further configures the system to: acquire one or more combinations of the utilization-rate coefficient for wind energy and the tip speed ratio, corresponding to the current pitch angle, from a predetermined relationship table, wherein the predetermined relationship table records a mapping relationship among the tip speed ratio, a pitch angle and the utilization-rate coefficient for wind energy; obtain a combination of which another relationship value indicating the predetermined relationship is closest to the determined relationship value, from the acquired one or more combinations of the utilization-rate coefficient for wind energy and the tip speed ratio; and take a tip speed ratio of the obtained combination as the current tip speed ratio. ### Claim 24 (depends on 22) The system according to claim 22, wherein the predetermined relationship is a ratio of the utilization-rate coefficient for wind energy of the wind turbine to a cube of the tip speed ratio of the wind turbine. ### Claim 25 (depends on 21) The system according to claim 21, wherein the computer program when executed by the processor further configures the system to: obtain one or more utilization-rate coefficients for wind energy corresponding to the current tip speed ratio, from a predetermined relationship table, wherein the predetermined relationship table records a mapping relationship between a tip speed ratio, a pitch angle, and a utilization-rate coefficient for wind energy; take a largest utilization-rate coefficient for wind energy among the obtained one or more utilization-rate coefficients for wind energy as the maximum utilization-rate coefficient for wind energy. ### Claim 26 (depends on 19) The system according to claim 19, wherein the computer program when executed by the processor further configures the system to: calculate a sum of the maximum active power capable to be outputted and the release power, and subtracting the current outputted active power from the calculated sum. ### Claim 27 (depends on 19) The system according to claim 19, wherein the predetermined time is a length of time during which the wind turbine is required to keep an output power in a rising state in primary frequency regulation. ### Claim 28 (depends on 19) The system according to claim 19, wherein the release power meets a condition, and the condition is that the wind turbine is operable at a speed greater than a switching-in speed for grid-connection of the wind turbine after releasing, at the release power, the rotation kinetic energy of the wind turbine for the predetermined time at the current rotation speed.