An Actively Supported Wind Power Cluster and its Control Method

Abstract

This invention discloses an active support wind power cluster and its control method. The wind power cluster includes a set A of N wind turbines with reserved capacity for active support and a set B of M wind turbines without active support capabilities. All wind turbines are connected to the same grid connection point via tie lines. For this wind power cluster, active support power control is performed based on the operating status of the wind turbines and the regulation capabilities of the wind turbines in sets A and B. Specifically, the grid connection point frequency is collected to obtain the support capacity required by the wind power cluster. The uncontrollable regulation power is calculated by combining the characteristic matrix of set B and the characteristic matrix of set A. The active support regulation correction power is then obtained by combining the characteristic matrix of set A. Based on the active support regulation correction power, the active support scheduling power matrix of set A and the scheduling power matrix of set B are adjusted to more accurately respond to the active support capacity required by the entire cluster.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation and grid-connected frequency active support control, specifically, it relates to an active support wind power cluster and control method. Background Technology

[0002] The new power system is highly electronic and heavily reliant on renewable energy. Because the external characteristics of power electronic equipment under traditional grid-connected control methods differ significantly from those of synchronous machines, the gradual advancement of the construction of a new power system primarily based on renewable energy places a demand on the active support capabilities of power electronic equipment. Energy storage-dependent collaborative control methods and reserved-capacity improved MPPT control methods can endow individual wind turbine units with a certain degree of active support capability. However, the energy storage-dependent collaborative control method requires additional energy storage equipment, resulting in higher initial investment. The reserved-capacity active support capability unit will lose some MPPT power generation revenue. Compared to the former, the former has a lower initial investment and therefore a faster adoption rate.

[0003] Existing methods also include some technical solutions for active support and control of wind power generation, such as:

[0004] Chinese invention patent document CN116169729A, published on May 26, 2023, discloses a method and system for rapid power control in an actively supported wind farm. This method categorizes wind turbines into low-wind-speed and high-wind-speed types based on wind speed, and allocates the base power and the power to be superimposed for each turbine at the target wind speed to obtain the target power for each turbine. While this method focuses on allocating active support power based on turbines in different wind speed ranges, it fails to consider the potential for increased active support power errors due to turbine malfunctions. Furthermore, it differs from the principle of this invention, which classifies turbines based on whether they have reserved capacity for active support.

[0005] Chinese invention patent document CN115912484A, published on April 4, 2023, discloses a wind farm power rapid control system that provides active grid support capability. It establishes an integrated allocation optimization model for the total active and reactive power support of the wind farm, considering wake effects. The objective function is to minimize the power of the wind farm's energy storage and reactive power compensation devices, i.e., prioritizing the utilization of the active and reactive power support capabilities of the wind turbines. While this method employs an objective optimization model, it fails to consider the potential for increased active support power errors due to turbine malfunctions. Furthermore, it differs fundamentally from the cluster classification control method of this invention, which classifies turbines based on whether they have reserved capacity for active support.

[0006] It is evident that existing active support control technologies for wind power generation have several drawbacks. They fail to consider the potential for units to malfunction and become unable to respond to power allocation, leading to increased errors in active support power. Furthermore, they do not fully leverage the flexible active support adjustment capabilities of reserved capacity units, resulting in an inability to quickly and accurately respond to the active support requirements of the entire wind power cluster. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides an active support wind power cluster and its control method. By combining the unit's operating status with the adjustment capabilities of the active support units, active support power control can be performed, enabling a more accurate response to the active support capabilities required by the entire cluster and reducing frequency fluctuations.

[0008] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows:

[0009] An active-support wind power cluster consists of two parts: a set A of N wind turbine units with reserved capacity for active support and a set B of M wind turbine units without active support, wherein: N≥1, M≥0; the wind turbine units in the wind power cluster are all connected to the same grid connection point through tie lines.

[0010] For an actively supported wind power cluster, the rated capacity matrix of the wind turbine set A is: The inertia constant matrix is ,satisfy:

[0011]

[0012] in, Describes the first wind turbine in set A. Rated capacity of typhoon generator sets; Describes the first wind turbine in set A. The inertia constant of a typhoon generator reflects its active support and adjustment capabilities.

[0013] For the actively supported wind power cluster, the rated capacity matrix of the wind turbine set B is: :

[0014]

[0015] in, Represents the first wind turbine in set B. Rated capacity of typhoon generator units.

[0016] For the actively supported wind power cluster, its equivalent inertial constant is: ,satisfy:

[0017] .

[0018] The control method for the actively supported wind power cluster includes the following steps:

[0019] S1: Calculate the power support capacity required for actively supported wind power clusters based on frequency deviation.

[0020] Real-time monitoring and collection of network frequency Calculate the support capacity required for actively supported wind power clusters based on the system frequency variation equation. :

[0021]

[0022] in, D The damping coefficient of the wind power cluster is generally in the range of 5 to 20. Frequency of grid connection point The change in quantity.

[0023] S2: Based on the characteristic matrix of wind turbine set B, calculate the uncontrollable adjustable power of all wind turbines in wind turbine set B. The characteristic matrix of the wind turbine set B includes: the current output power matrix. Predicted power matrix Running state matrix ;

[0024] S21: Current output power matrix in wind turbine set B Predicted power matrix Running state matrix ,satisfy:

[0025]

[0026]

[0027]

[0028] in, Represents the first wind turbine in set B. The current output power of the typhoon generator set; Represents the first wind turbine in set B. Predicted power output of typhoon generators; Represents the first wind turbine in set B. The operating status of the typhoon generator units =1 indicates normal operation. =0 indicates a shutdown fault.

[0029] S22: Uncontrollable adjustable power of all wind turbines in wind turbine set B ,satisfy:

[0030]

[0031] S3: Based on the characteristic matrix of wind turbine set A and the uncontrollable adjustable power of all wind turbines in wind turbine set B. Calculate the active support adjustment correction power The characteristic matrix of the wind turbine set A includes: the current output power matrix. Predicted power matrix Running state matrix Wind speed matrix Minimum threshold wind speed matrix for active support , Participate in active support state matrix ;

[0032] S31: The current output power matrix Predicted power matrix Running state matrix ,satisfy:

[0033]

[0034]

[0035]

[0036] in, Describes the first wind turbine in set A. The current output power of the typhoon generator set; Describes the first wind turbine in set A. Predicted power output of typhoon generators; Describes the first wind turbine in set A. The operating status of the typhoon generator units =1 indicates normal operation. =0 indicates a shutdown fault.

[0037] S32: Collected wind speed matrix Minimum threshold wind speed matrix for active support , Participate in active support state matrix ,satisfy:

[0038]

[0039]

[0040]

[0041] in, Describes the first wind turbine in set A. Wind speed collected by the typhoon generator; Describes the first wind turbine in set A. The minimum threshold wind speed for typhoon turbine units to participate in active support; Describes the first wind turbine in set A. The status of a typhoon turbine participating in active support is indicated by a value of 1, which shows that the turbine participates in active support due to high wind speed, and a value of 0, which shows that the turbine does not participate in active support due to low wind speed. This status is determined by the following conditions:

[0042]

[0043] S33: Calculate the active support adjustment correction power ,satisfy:

[0044]

[0045] Among them, the function satisfy:

[0046]

[0047] S4: Calculate the active support scheduling power matrix for all wind turbines in wind turbine set A. And the scheduling power matrix of all wind turbines in wind turbine set B. ,satisfy:

[0048]

[0049]

[0050] in, Describes the first wind turbine in set A. Active support and dispatch power of typhoon generator units Represents the first wind turbine in set B. Dispatch power of typhoon generator units.

[0051] S41: When the wind turbine set A contains the first Predicted power of typhoon turbines Less than or equal to the current output power When this occurs, it indicates that the wind turbine is in a reduced power state, satisfying the following conditions:

[0052] ;

[0053] S42: When the wind turbine set A contains the first Predicted power of typhoon turbines Greater than the current output power hour:

[0054] ① This indicates that the current wind speed is below its minimum threshold wind speed, and the wind turbine unit does not participate in active support. Therefore:

[0055] ;

[0056] ② This indicates that the current wind speed exceeds its minimum threshold wind speed, and the wind turbine unit is participating in active support. The power is adjusted and corrected based on the active support. The units are allocated to the active support regulating units according to their regulating capacity, satisfying the following requirements:

[0057] ;

[0058] S43: Dispatch power of the j-th wind turbine in wind turbine set B ,satisfy:

[0059] .

[0060] In the above control adjustment process, 1≤i≤N, 1≤j≤M.

[0061] The beneficial effects of this invention are as follows:

[0062] This invention designs a specific wind power cluster structure, which combines the operating status of wind turbine units with the adjustment capabilities of the active support units to perform active support power control, enabling more accurate response to the active support capabilities required by the entire cluster and reducing frequency fluctuations. Attached Figure Description

[0063] Figure 1 This is a flowchart of the active support wind power cluster control in an embodiment of the present invention. Detailed Implementation

[0064] This invention provides an active support wind power cluster and control method. By combining the unit's operating status and the adjustment capability of the active support unit, active support power control is performed, which can more accurately respond to the active support capability required by the entire cluster and reduce frequency fluctuations.

[0065] To better understand the above technical solutions, the following will describe the above technical solutions in detail with reference to the accompanying drawings and specific embodiments, but the embodiments of the present invention are not limited thereto.

[0066] An active-support wind power cluster consists of two parts: a set A of N wind turbine units with reserved capacity for active support and a set B of M wind turbine units without active support, wherein: N≥1, M≥0; the wind turbine units in the wind power cluster are all connected to the same grid connection point through tie lines.

[0067] For actively supported wind power clusters, based on the rated capacity matrix of set A... Inertia constant matrix The rated capacity matrix of set B Calculate the equivalent inertial constant of the wind power cluster. Specifically, it satisfies:

[0068]

[0069]

[0070]

[0071]

[0072] in, Describes the first wind turbine in set A. Rated capacity of typhoon generator sets; Describes the first wind turbine in set A. The inertia constant of a typhoon generator reflects its active support and adjustment capability. Represents the first wind turbine in set B. Rated capacity of typhoon generator set; 1≤i≤N, 1≤j≤M.

[0073] For the aforementioned active support wind power clusters, according to Figure 1 The control implementation steps shown are as follows:

[0074] Step 1: Monitor and collect the grid connection frequency f in real time, and combine it with the equivalent inertial constant of the wind power cluster from Step 2. Calculate the support capacity required for actively supported wind power clusters. Specifically, it satisfies:

[0075]

[0076] in, D The damping coefficient of the wind power cluster is... D The value ranges from 5 to 20; Frequency of grid connection point The change in;

[0077] Step 2: Based on the characteristic matrix of set B and the supporting capabilities from step 1. Calculate the uncontrollable adjustable power of all units in set B. The characteristic matrix of set B includes: the current output power matrix. Predicted power matrix Running state matrix

[0078] Specifically, the following conditions are met:

[0079]

[0080]

[0081]

[0082]

[0083] in, Describes the first element in set B. The current output power of the typhoon generator set; Describes the first element in set B. Predicted power output of typhoon generators; Describes the first element in set B. The operating status of the typhoon generator units =1 indicates normal operation. =0 indicates a shutdown fault.

[0084] Step 3: Based on the characteristic matrix of set A and the uncontrollable adjustable power of all units in set B. Combined with the uncontrollable adjustable power in the second step Calculate the active support adjustment correction power ;

[0085] The characteristic matrix of set A includes: the current output power matrix. Predicted power matrix Running state matrix Wind speed matrix Minimum threshold wind speed matrix for active support , Participate in active support state matrix ;

[0086] Specifically, the following conditions are met:

[0087]

[0088]

[0089]

[0090]

[0091]

[0092]

[0093]

[0094]

[0095]

[0096] in, Describe the first element in set A. The current output power of the typhoon generator set; Describe the first element in set A. Predicted power output of typhoon generators; Describe the first element in set A. The operating status of the typhoon generator units =1 indicates normal operation. =0 indicates a shutdown fault; Describe the first element in set A. Wind speed collected by the typhoon generator; Indicates the first The minimum threshold wind speed for typhoon turbine units to participate in active support; Indicates the first Typhoon turbine active support status

[0097] Step 4: Calculate the active support scheduling power matrix for set A. and the scheduling power matrix of set B. .satisfy:

[0098]

[0099]

[0100] in, Describe the first element in set A. Active support and dispatch power of typhoon generator units Let represent the dispatch power of the j-th wind turbine in set B.

[0101] (1) When the first in set A Predicted power of typhoon turbines Less than or equal to the current output power When this occurs, it indicates that the unit is in a reduced power state, satisfying the following conditions:

[0102] ;

[0103] (2) When the first in set A Predicted power of typhoon turbines Greater than the current output power hour:

[0104] ①When This indicates that the current wind speed is below its minimum threshold wind speed, and the wind turbine does not participate in active support. Therefore:

[0105] ;

[0106] ③ This indicates that the current wind speed exceeds its minimum threshold wind speed, and the wind turbine is participating in active support. The power is adjusted and corrected based on the active support. The units are allocated to the active support regulating units according to their regulating capacity, satisfying the following requirements:

[0107] ;

[0108] (3) The dispatch power of the j-th wind turbine in set B ,satisfy:

[0109] .

[0110] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: In view of the problem that existing methods do not consider the actual operating status of the unit, which may lead to the unit being unable to respond to the power allocation due to a fault state, resulting in an increase in the active support power error, this method combines the operating status of the unit and performs active support power control according to the adjustment capability of the active support capability of the unit, which can more accurately respond to the active support capability required by the entire cluster.

Claims

1. A control method for an actively supported wind power cluster, characterized in that, The wind power cluster consists of two sets: A, consisting of N wind turbines with reserved capacity and active support capability, and B, consisting of M wind turbines without active support capability, where N≥1 and M≥0; the wind turbines in the wind power cluster are all connected to the same grid connection point via interconnection lines. Based on the operating status of the wind turbines, and according to the adjustment capabilities of all wind turbines within wind turbine set A and wind turbine set B, active support power control is implemented. The specific control method is as follows: The first step is to monitor and collect network frequency data in real time. Calculate the support capacity required for actively supported wind power clusters. ; The second step is to calculate the uncontrollable adjustable power of all wind turbines in wind turbine set B based on the characteristic matrix of wind turbine set B. ; The third step involves using the characteristic matrix of wind turbine set A and the uncontrollable adjustable power of all wind turbines in wind turbine set B obtained in the second step. Calculate the active support adjustment correction power of the wind power cluster. ; The fourth step is to adjust and correct the power based on the active support. Adjust the active support scheduling power matrix of the wind turbine set A. and the scheduling power matrix of wind turbine set B. .

2. The control method according to claim 1, characterized in that, The rated capacity matrix of the wind turbine set A Inertia constant matrix The rated capacity matrix of wind turbine set B ,satisfy: in, Describes the first wind turbine in set A. Rated capacity of typhoon generator sets; Describes the first wind turbine in set A. The inertial constant of a typhoon generator unit; Represents the first wind turbine in set B. The rated capacity of the typhoon generator set is: 1≤i≤N, 1≤j≤M; The equivalent inertial constant of the wind power cluster satisfy: 。 3. The control method according to claim 2, characterized in that, In the first step, the supporting capability The calculation method is as follows: in, D The damping coefficient of the wind power cluster is... D The value ranges from 5 to 20; Frequency of grid connection point The change in quantity.

4. The control method according to claim 3, characterized in that, In the second step, the characteristic matrix of the wind turbine set B includes: the current output power matrix. Predicted power matrix Running state matrix The characteristic matrix of the wind turbine set B satisfies: in, Represents the first wind turbine in set B. The current output power of the typhoon generator set; Represents the first wind turbine in set B. Predicted power output of typhoon generators; Represents the first wind turbine in set B. The operating status of the typhoon generator units =1 indicates normal operation. =0 indicates a shutdown fault.

5. The control method according to claim 4, characterized in that, Calculate the uncontrollable adjustable power in the second step ,satisfy: 。 6. The control method according to claim 5, characterized in that, In the third step, the characteristic matrix of the wind turbine set A includes: the current output power matrix. Predicted power matrix Running state matrix Wind speed matrix Minimum threshold wind speed matrix for active support Participate in the active support state matrix ,in: (1) The current output power matrix Predicted power matrix Running state matrix ,satisfy: in, Describes the first wind turbine in set A. The current output power of the typhoon generator set; Indicates the first wind turbine in wind turbine A Predicted power output of typhoon generators; Indicates the first wind turbine in wind turbine A The operating status of the typhoon generator units =1 indicates normal operation. =0 indicates a shutdown fault; (2) The wind speed matrix Minimum threshold wind speed matrix for active support Participate in the active support state matrix ,satisfy: in, Describes the first wind turbine in set A. Wind speed collected by the typhoon generator; Describes the first wind turbine in set A. The minimum threshold wind speed for typhoon turbine units to participate in active support; Describes the first wind turbine in set A. The status of a typhoon turbine participating in active support is defined as follows: a value of 1 indicates that the turbine participates in active support due to high wind speed, while a value of 0 indicates that the turbine does not participate in active support due to low wind speed. This is conditional upon the following: (3) Calculate the active support adjustment correction power At that time, the following conditions are met: Among them, the function satisfy: 。 7. The control method according to claim 6, characterized in that, The active support scheduling power matrix of the wind turbine set A and the scheduling power matrix of wind turbine set B. ,satisfy: in, Describes the first wind turbine in set A. Active support and dispatch power of typhoon generator units This represents the dispatch power of the j-th wind turbine in the set of wind turbines B.

8. The control method according to claim 7, characterized in that, In specific control and adjustment: (1) When the first wind turbine in set A Predicted power of typhoon turbines Less than or equal to the current output power When this occurs, it indicates that the wind turbine is in a reduced power state, satisfying the following conditions: (2) When the first wind turbine in set A Predicted power of typhoon turbines Greater than the current output power hour: ①When This indicates that the current wind speed is below its minimum threshold wind speed, and the wind turbine unit does not participate in active support. Therefore: ②When This indicates that the current wind speed exceeds its minimum threshold wind speed, and the wind turbine unit participates in active support; the power is adjusted and corrected according to the active support. The units are allocated to the active support regulating units according to their regulating capacity, satisfying the following requirements: (3) The dispatch power of the j-th wind turbine in wind turbine set B ,satisfy: 。

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