A method and system for improving the accuracy of calculating available power of a wind farm

Abstract

The present invention relates to the field of electric power systems, and in particular to a method and system for improving the accuracy of calculating available power in a wind farm. The method comprises the following steps: selecting the location of data collection points in a wind farm; obtaining data on the active power, available power and installed capacity of the entire farm according to the location data of each collection point; judging the power restriction state of the entire farm; calculating the available power of the entire farm by using a corresponding data algorithm according to different power restriction states; calculating the actual power and available power by using the active power and available power of the entire farm for time integration respectively; and calculating the accuracy of available power according to the actual power and available power. The present invention utilizes the above method and system to optimize the available power according to different power restriction states, and then calculates the accuracy of the available power, thereby solving the problems of low accuracy of available power and high operating cost in the prior art. The present invention improves the accuracy of available power and indirectly reduces the operating cost of an electric farm.

Description

Technical Field

[0001] The present invention relates to the field of electric power systems, and in particular to a method and a system for improving the accuracy of calculating the available power of a wind farm. Background Art

[0002] Theoretical power refers to the maximum power that can be generated when all power generation equipment in the station is operating normally under the current natural meteorological resource conditions. Available power refers to the actual power that can be generated after excluding the power loss caused by equipment failure, defects or maintenance in the station under the current natural meteorological resource conditions. The theoretical power of the station should not be greater than the installed capacity and should not be less than the available power of the station; the available power of the station should not be greater than the start-up capacity and should not be less than the actual power generation. The available power generation power of the station during non-power-limited periods should be equal to the actual power generation power. When the station has no power generation capacity, the actual power generation power should be 0.

[0003] Available power is an important technical indicator of power generation efficiency of power plants. The accuracy of available power greatly affects the accuracy of power generation efficiency of power plants. Available power is also an assessment indicator of current power plants, and its accuracy also indirectly affects the operating costs of power plants. Since the available power under power-limited and non-power-limited conditions is quite different, and the existing technology does not distinguish between power-limited conditions, the accuracy of available power calculated by the existing technology is low, which is not conducive to the assessment results of the power plant and seriously affects the operation of the power plant. Therefore, it is urgent to propose a method to improve the accuracy of available power to reduce the impact on the operation of the power plant.

[0004] However, currently no method for optimizing and improving the accuracy of available power has been proposed. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention discloses a method and system for improving the accuracy of calculating the available power of a wind farm. The present invention solves the problems of low accuracy of available power and high operating cost in the prior art by judging the power-limiting status of the wind farm and adopting different full-field available power algorithms.

[0006] The specific technical solution disclosed in the present invention is as follows: A method for improving the accuracy of calculating the available power of a wind farm, characterized in that it comprises the following steps:

[0007] S01. Select the location of wind farm data collection points;

[0008] S02. Obtain the data of the total active power R, the total available power K and the total installed capacity Pn according to the location data of each collection point;

[0009] S03. Determine the power restriction status of the wind farm;

[0010] S04. Calculate the total available power K using the corresponding data algorithm according to different power-limiting states:

[0011] When the whole site is in a power-limited state, determine the relationship between the whole site available power K and the whole site installed capacity Pn. If the whole site available power K is greater than or equal to the whole site installed capacity Pn, directly upload the whole site installed capacity Pn as the whole site available power; if the whole site available power K is less than the whole site installed capacity Pn, upload according to the actual available power, and exempt from the available power assessment;

[0012] When the whole field is in a non-power-limited state, the whole field available power K refers to the sum of the active power of the collector line, and the whole field available power K=R+R×(0-3%) is uploaded as a random number, and the relationship between the whole field available power K and the whole field installed capacity Pn is judged: if the whole field available power K is greater than or equal to the whole field installed capacity Pn, the whole field installed capacity Pn is directly uploaded, otherwise the whole field available power K is uploaded;

[0013] S05. Use the total active power R and the total available power K to calculate the actual power E by time integration M and available power E T ;

[0014] S06. Based on the actual power E M and available power E T Calculate the accuracy of available power:

[0015]

[0016] Where: E M E is the actual power generation of the station during the non-power-restriction period; T is the available power during the non-power-restricted period of the station; when E M When it is 0, the accuracy of available power will no longer be assessed.

[0017] Furthermore, the method for determining the power-limiting state in step S03 is:

[0018] First, the number of power-limited units T of the entire site is obtained, then the number of installed units Z of the entire site is obtained, and the configuration parameter A is obtained, where the value range of the configuration parameter A is 0≤A≤1;

[0019] Secondly, calculate the product of the total number of installed units Z and the configuration parameters, and compare it with the total number of units with limited power T;

[0020] Then, if the number of power-limited units T in the entire site is less than the product of the total number of installed units Z and the configuration parameter A, the entire site is in a non-power-limited state, otherwise the entire site is in a power-limited state.

[0021] As an alternative, the method for determining the power-limited state in step S03 is:

[0022] First, the planned load P and the total active power R are obtained, then the total installed capacity Pn is obtained, and the configuration parameter B is obtained. The value range of the configuration parameter B is 0≤B≤1;

[0023] Secondly, calculate the difference between the planned load P and the total active power R, then calculate the product of the total installed capacity Pn and the configuration parameter B, and compare the difference with the product;

[0024] Then, if the difference between the planned load P and the total active power R is greater than or equal to the product of the total installed capacity Pn and the configuration parameter B, the entire field is in a non-power-limited state, otherwise the entire field is in a power-limited state.

[0025] Furthermore, the process of acquiring data in step S02 is:

[0026] The AGC master station on the dispatching side calculates the power restriction sign and transmits one data every minute. A power restriction point is set at a specific interval T.

[0027] Collect the booster station line information and transmit it to the telecontrol system at the power plant in real time; transmit it to the dispatching side SCADA system through the telecontrol channel to calculate the total active power of the electric field, collect a total active data at the same interval T, and obtain the total active power R of the field;

[0028] Collect the unit information of the wind turbine group and transmit it to the energy management system at the power plant in real time; then transmit it to the AGC master station on the dispatching side to obtain the real-time data of the unit's available power and transmit it to the dispatching wind power master station; the dispatching wind power master station calculates the available power of the entire site and collects the available power data K of the entire site at the same interval of time T.

[0029] Furthermore, the data collection point for the total active power R is selected as the sum of the active power of the wind farm collection lines.

[0030] Furthermore, the data collection points for the total available power K are selected from the sum of the wind turbine outputs, the sum of the active power of the collector lines, the high and low voltage sides of the main transformer, or the location of the station grid connection point.

[0031] Utilizing the above method for improving the accuracy of available power in a wind farm, the present invention further provides a system for improving the accuracy of available power in a wind farm, the system comprising:

[0032] The booster station collection unit is used to collect real-time data on the active power of the booster station collector line;

[0033] The transmission unit at the power plant end is used to transmit the data collected by the booster station collection unit to the dispatching side;

[0034] The dispatching side SCADA unit is used to receive the real-time data of the active power of the collector line transmitted by the electric field end transmission unit, and add and calculate the total active power of the power generation;

[0035] A fan group collection unit is used to collect information data of the fan group units;

[0036] The energy management unit at the power plant end is used to collect the unit data of the wind turbine collection unit and transmit it to the AGC master station at the dispatching side;

[0037] The AGC master station on the dispatching side selects the unit available power data transmitted by the energy management unit at the power plant end, transmits it to the dispatching wind power master station, and calculates the power limit point at the same time;

[0038] The dispatching wind power master station is used to collect the unit available power data transmitted by the dispatching side AGC master station and calculate the total available power;

[0039] The data calculation unit collects the total active power data of the dispatching side SCADA unit, the total available power data of the dispatching wind power master station and the power restriction flag of the dispatching side AGC master station, and calculates the accuracy of the available power during the non-power restriction period.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] 1) The available power calculation method in the present invention greatly improves the accuracy of available power, indirectly reducing the station operation cost.

[0042] 2) In the present invention, by judging the power-limited state and adopting different available power algorithms, the influence of the data under the power-limited state on the accuracy of available power is eliminated, and the calculation accuracy is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of an available power algorithm used according to different power-limiting states in an embodiment of the present invention;

[0044] Figure 2 is a flow chart of a method for determining a power-limiting state in an embodiment of the present invention;

[0045] Figure 3 is a flow chart of another power-limiting state determination method in an embodiment of the present invention;

[0046] Figure 4 This is a system structure diagram for improving the accuracy of calculating the available power of a wind farm in an embodiment of the present invention;

[0047] Figure 5 It is the monthly average available power accuracy of each electric field after the available power is optimized in the embodiment of the present invention. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0049] Example:

[0050] Combination Figure 1-3 As shown, a method for improving the accuracy of calculating the available power of a wind farm comprises the following steps:

[0051] S01. Select the location of wind farm data collection points;

[0052] S02. Obtain the data of the total active power R, the total available power K and the total installed capacity Pn according to the location data of each collection point;

[0053] S03. Determine the power restriction status of the wind farm;

[0054] S04. Use corresponding data algorithms to optimize the available power K of the entire site according to different power-limiting states:

[0055] When the whole site is in a power-limited state, determine the relationship between the whole site available power K and the whole site installed capacity Pn. If the whole site available power K is greater than or equal to the whole site installed capacity Pn, directly upload the whole site installed capacity Pn as the whole site available power; if the whole site available power K is less than the whole site installed capacity Pn, upload according to the actual available power, and exempt from the available power assessment;

[0056] When the whole field is in a non-power-limited state, the whole field available power K refers to the sum of the active power of the collector line, and the whole field available power K=R+R×(0-3%) is uploaded as a random number, and the relationship between the whole field available power K and the whole field installed capacity Pn is judged: if the whole field available power K is greater than or equal to the whole field installed capacity Pn, the whole field installed capacity Pn is directly uploaded, otherwise the whole field available power K is uploaded;

[0057] S05. Use the total active power R and the total available power K to calculate the actual power E by time integration M and available power E T ;

[0058] S06. Based on the actual power E M and available power E T Calculate the accuracy of available power P E :

[0059]

[0060] Where: E M The actual power generation of the station during the non-power-restriction period; E T is the available power during the non-power-restricted period of the station; when E M When it is 0, the accuracy of available power will no longer be assessed.

[0061] The method for determining the power-limiting state in step S03 is:

[0062] First, the number of power-limited units T of the entire site is obtained, then the number of installed units Z of the entire site is obtained, and the configuration parameter A is obtained, where the value range of the configuration parameter A is 0≤A≤1;

[0063] Secondly, calculate the product of the total number of installed units Z and the configuration parameters, and compare it with the total number of units with limited power T;

[0064] Then, if the number of power-limited units T in the entire site is less than the product of the total number of installed units Z and the configuration parameter A, the entire site is in a non-power-limited state, otherwise the entire site is in a power-limited state.

[0065] As an alternative, the method for determining the power-limited state in step S03 is:

[0066] First, the planned load P and the total active power R are obtained, then the total installed capacity Pn is obtained, and the configuration parameter B is obtained. The value range of the configuration parameter B is 0≤B≤1;

[0067] Secondly, calculate the difference between the planned load P and the total active power R, then calculate the product of the total installed capacity Pn and the configuration parameter B, and compare the difference with the product;

[0068] Then, if the difference between the planned load P and the total active power R is greater than or equal to the product of the total installed capacity Pn and the configuration parameter B, the whole field is in a non-power-limited state, otherwise the whole field is in a power-limited state.

[0069] The process of acquiring data in step S02 is:

[0070] The AGC master station on the dispatching side calculates the power-limiting sign, transmits one data every minute, and sets a power-limiting point every 15 minutes;

[0071] Collect the booster station line information and transmit it to the telecontrol system at the power plant in real time; transmit it to the dispatching side SCADA system through the telecontrol channel to calculate the total active power of the electric field. Collect the total active power data every 15 minutes to obtain the active power R of the whole field;

[0072] Collect the unit information of the wind turbine group and transmit it to the energy management system at the power plant in real time; then transmit it to the AGC master station on the dispatching side to obtain the real-time data of the unit's available power and transmit it to the dispatching wind power master station; the dispatching wind power master station calculates the available power of the entire site and collects the available power data K of the entire site at intervals of 15 minutes.

[0073] The data collection point for the total active power R is the sum of the active power of the wind farm collection lines.

[0074] The data collection point for the total available power K is selected from the sum of wind turbine outputs, the sum of active power of wind farm collection lines, the high and low voltage sides of the main transformer, or the station grid connection point. In this embodiment, the sum of active power of wind farm collection lines is preferred.

[0075] Combination Figure 4 As shown, using the above method for improving the accuracy of available power in a wind farm, the present invention also provides a system for improving the accuracy of available power in a wind farm, the system comprising:

[0076] The booster station collection unit is used to collect real-time data on the active power of the booster station collector line;

[0077] The transmission unit at the power plant end is used to transmit the data collected by the booster station collection unit to the dispatching side;

[0078] The dispatching side SCADA unit is used to receive the real-time data of the active power of the collector line transmitted by the electric field end transmission unit, and add and calculate the total active power of the power generation;

[0079] A fan group collection unit is used to collect information data of the fan group units;

[0080] The energy management unit at the power plant end is used to collect the unit data of the wind turbine collection unit and transmit it to the AGC master station at the dispatching side;

[0081] The AGC master station on the dispatching side selects the unit available power data transmitted by the energy management unit at the power plant end, transmits it to the dispatching wind power master station, and calculates the power limit point at the same time;

[0082] The dispatching wind power master station is used to collect the unit available power data transmitted by the dispatching side AGC master station and calculate the total available power;

[0083] The data calculation unit collects the full-field active power data of the dispatching side SCADA unit, the full-field available power data of the dispatching wind power master station and the power restriction flag of the dispatching side AGC master station, and calculates the accuracy of available power during the non-power restriction period.

[0084] Combination Figure 5 As shown, after adopting the method and system of the present invention, the accuracy of calculating the available power of the wind farm is greatly improved.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for improving the accuracy of calculating the available power of a wind farm, characterized in that: The steps include: S01. Select the location of wind farm data collection points; S02. Obtain the data of the total active power R, the total available power K and the total installed capacity Pn according to the location data of each collection point; S03. Determine the power-limiting status of the entire site; S04. Calculate the total available power K using the corresponding data algorithm according to different power-limiting states: 1) When the whole site is in a power-limited state, determine the relationship between the whole site available power K and the whole site installed capacity Pn. If the whole site available power K is greater than or equal to the whole site installed capacity Pn, directly upload the whole site installed capacity Pn as the whole site available power; if the whole site available power K is less than the whole site installed capacity Pn, upload according to the actual available power, and exempt from the available power assessment; 2) When the whole field is in a non-power-limited state, the whole field available power K refers to the sum of the active power of the collector lines, and the whole field available power K=R+R×(0-3%) is uploaded as a random number, and the relationship between the whole field available power K and the whole field installed capacity Pn is judged: if the whole field available power K is greater than or equal to the whole field installed capacity Pn, the whole field installed capacity Pn is directly uploaded, otherwise the whole field available power K is uploaded; S05. Use the total active power R and the total available power K to calculate the actual power E by time integration M and available power E T ; S06. Based on actual power E M and available power E T Calculate the accuracy of available power P E : Where: E M E is the actual power generation of the station during the non-power-restriction period; T is the available power during the non-power-restricted period of the station; when E M When it is 0, the accuracy of available power will no longer be assessed; The process of acquiring data in step S02 is: The AGC master station on the dispatching side calculates the power restriction sign and transmits one data every minute. A power restriction point is set at a specific interval T. Collect the booster station line information and transmit it to the telecontrol system at the power plant in real time; transmit it to the dispatching side SCADA system through the telecontrol channel to calculate the total active power of the electric field, collect a total active data at the same interval T, and obtain the total active power R of the field; Collect the unit information of the wind turbine group and transmit it to the energy management system at the power plant in real time; then transmit it to the AGC master station on the dispatching side to obtain the real-time data of the unit's available power and transmit it to the dispatching wind power master station; the dispatching wind power master station calculates the available power of the entire site and collects a piece of available power data K of the entire site at the same interval T; The method for determining the field-wide power-limiting state in step S03 is as follows: First, obtain the total power limit number T of all units in the field, then obtain the total installed number Z, and obtain the configuration parameter A; Secondly, calculate the product of the total number of installed units Z and the configuration parameters, and compare it with the total number of units with limited power T; Then, if the number of power-limited units T in the entire site is less than the product of the total number of installed units Z and the configuration parameter A, the entire site is in a non-power-limited state, otherwise the entire site is in a power-limited state.

2. A method for improving the accuracy of calculating the available power of a wind farm according to claim 1, characterized in that: The method for determining the field-wide power-limiting state in step S03 is as follows: First, obtain the planned load P and the total active power R, then obtain the total installed capacity Pn, and obtain the configuration parameter B; Secondly, calculate the difference between the planned load P and the total active power R, then calculate the product of the total installed capacity Pn and the configuration parameter B, and compare the difference with the product; Then, if the difference between the planned load P and the total active power R is greater than or equal to the product of the total installed capacity Pn and the configuration parameter B, the whole field is in a non-power-limited state, otherwise the whole field is in a power-limited state.

3. The method for improving the accuracy of calculating the available power of a wind farm according to claim 1, characterized in that: The value range of the configuration parameter A is 0≤A≤1.

4. A method for improving the accuracy of calculating available power of a wind farm according to claim 2, characterized in that: The value range of the configuration parameter B is 0≤B≤1.

5. The method for improving the accuracy of calculating the available power of a wind farm according to claim 1, characterized in that: In step S01, the data collection point for the active power of the entire field is the sum of the active power of the wind farm collection lines.

6. A method for improving the accuracy of calculating available power of a wind farm according to claim 1, characterized in that: In step S01, the data collection points for the total available power are selected from the sum of the wind turbine outputs, the sum of the active power of the collector lines, the high and low voltage sides of the main transformer, or the location of the station grid connection point.

7. A system for improving the accuracy of calculating the available power of a wind farm by using the method for improving the accuracy of calculating the available power of a wind farm as described in any one of claims 1 to 6, characterized in that: include: The booster station collection unit is used to collect real-time data on the active power of the booster station collector line; The transmission unit at the power plant end is used to transmit the data collected by the booster station collection unit to the dispatching side; The dispatching side SCADA unit is used to receive the real-time data of the active power of the collector line transmitted by the electric field end transmission unit, and add and calculate the total active power of the power generation; A fan group collection unit is used to collect information data of the fan group units; The energy management unit at the power plant end is used to collect the unit data of the wind turbine collection unit and transmit it to the AGC master station at the dispatching side; The AGC master station on the dispatching side receives the available power data transmitted by the energy management unit on the power plant side and transmits it to the dispatching wind power master station; The dispatching wind power master station is used to collect the available power data transmitted by the dispatching side AGC master station and calculate the total available power; The data calculation unit collects the total active power data of the dispatching side SCADA unit, the total available power data of the dispatching wind power master station and the power restriction flag of the dispatching side AGC master station, and calculates the accuracy of the available power during the non-power restriction period.

Images