A method for controlling energy storage based on adjustable power of wind farm

Abstract

The present invention provides an energy storage control method based on adjustable power of a wind farm, including: obtaining the real-time wind speed of each wind turbine, guaranteeing the power curve, the controlled state of the active power of the unit, the maximum active power setting feedback power of the unit, the installed capacity of the wind farm, the energy storage ratio K and the AGC active power command value of the power grid; calculating the theoretical active power of a single unit, obtaining the adjustable active power of a single unit, and obtaining the adjustable active power of the whole field, the adjustable active power of the whole field one - the installed capacity of the wind farm * K = the adjustable active power of the whole field two; if the adjustable active power of the whole field one is greater than or equal to the installed capacity of the wind farm * (0.2 + K), the smaller value is taken from the AGC active power command value of the power grid and the adjustable active power of the whole field two as the active power execution target value of the wind farm and sent to the unit for active power control. Under the premise of meeting the control requirements of the power grid, part of the energy is automatically stored to meet the increase of the power requirements of the wind farm during the disturbance of the wind farm frequency, thereby improving the overall power grid adaptability of the wind farm.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to an energy storage control method based on adjustable power of a wind farm. Background Art

[0002] In recent years, wind power generation has developed rapidly, and new energy generation based on wind power has grown stronger and stronger. Wind power generation has become one of the main new energy generation sources. With the gradual increase in the scale of wind power generation, it is possible to effectively support the grid frequency through wind power equipment. Therefore, it is necessary to study the power control method of wind farms to ensure that the grid can be effectively supported when the wind farm grid frequency fluctuates. Summary of the invention

[0003] In view of this, the problem to be solved by the present invention is to provide a method for controlling energy storage based on adjustable power of a wind farm, and to precisely and reasonably control the active power control process of the wind farm, with the focus on avoiding the problem that the wind farm cannot respond to the grid instructions during frequency disturbances because it has no way to adjust the active power upward.

[0004] The present invention solves the above technical problems through the following technical means: The present invention provides an energy storage control method based on adjustable power of a wind farm, comprising the following steps:

[0005] S1. Obtain the real-time wind speed of each wind turbine in the wind farm, guaranteed power curve, active power control state of the turbine, maximum active power setting feedback power of the turbine, installed capacity of the wind farm, energy storage ratio K, and active power command value of the power grid AGC;

[0006] S2, based on the parameters obtained in step S1, the theoretical active power of a single unit is calculated, and the adjustable active power of a single unit is obtained in combination with the controlled state of the unit, and the adjustable active power of the single unit of the whole field is accumulated to obtain the adjustable active power of the whole field one, and according to the calculation formula: the adjustable active power of the whole field one - the installed capacity of the wind farm * K = the adjustable active power of the whole field two, the adjustable active power of the whole field two is obtained;

[0007] S3, determine whether the total adjustable active power 1 is greater than or equal to the installed capacity of the wind farm * (0.2 + K), if it is greater than or equal to, then take the smaller value of the grid AGC active power command value and the total adjustable active power 2 as the wind farm active power execution target value;

[0008] S4. Send the active power execution target value of a single wind turbine to the unit for active power control.

[0009] Furthermore, step S1 also includes:

[0010] S11, obtaining the wind farm frequency regulation energy storage enabling switch information, the power grid primary frequency regulation trigger signal and the energy storage trigger signal;

[0011] S12, determining whether the wind farm frequency regulation energy storage enable switch is turned on, if it is turned on, proceeding to step S13, if not, returning to step S11;

[0012] S13, judging whether the primary frequency modulation of the power grid is triggered, if the primary frequency modulation is not triggered, proceeding to step S14, if the primary frequency modulation is triggered, returning to step S11;

[0013] S14, determine whether the energy storage trigger signal is triggered, if triggered, go to step S2, if not triggered, return to step S11.

[0014] Furthermore, the determining whether the wind farm frequency regulation energy storage enable switch is turned on also includes collecting software configuration item data to clarify whether the wind farm frequency regulation energy storage enable switch enableEs is turned on, and the system configuration is True for on and False for off.

[0015] Furthermore, the determining whether the primary frequency modulation action of the power grid is executed also includes obtaining a primary frequency modulation trigger signal emsIsFreMod from the power grid, and executing the primary frequency modulation action of the power grid if the received data is True, and not executing the primary frequency modulation action if the received data is False.

[0016] Furthermore, the determination of whether the energy storage trigger signal is triggered also includes obtaining an energy storage trigger signal energyStorageEnable from the power grid, and if the received data is True, the power grid requires the execution of an energy storage action in a non-primary frequency modulation triggering situation, and if the received data is False, no energy storage action is executed.

[0017] Furthermore, the system needs to meet the following conditions to turn on the frequency modulation energy storage function:

[0018] The wind farm frequency regulation and energy storage enable switch is triggered, that is, enableEs = True; the power grid frequency regulation trigger signal and energy storage trigger signal are judged again;

[0019] The frequency modulation trigger signal is not triggered, that is, emsIsFreMod = False;

[0020] The energy storage trigger signal is triggered, that is, energyStorageEnable = True;

[0021] The total adjustable active power of the whole field is ≥ the installed capacity of the wind farm*(0.2+K), that is, emsActLimitTop1≥fWFContractCapacity*(0.2+K).

[0022] Further, step S2 also includes:

[0023] By obtaining the i-th wind speed emsWinSpd_i, searching in the power curve powCurve, we can obtain the theoretical active power that each unit can generate at the current wind speed, the theoretical active power of each unit wOughtPower_i;

[0024] Then the theoretical active power of the single machine, the active power controlled state of the unit emsRun_i and the maximum active power setting feedback power emsActPowerRead_i of the unit are calculated.

[0025] The adjustable active power of a single machine is obtained as follows:

[0026] That is, when emsRun_i=±1, mOughtPowerT_i=wOughtPower_i;

[0027] When emsRun_i≠±1, mOughtPowerT_i=emsActPowerRead_i;

[0028] If the number of wind turbines in a wind farm is n, the total adjustable active power of all turbines is accumulated to obtain the total adjustable active power -emsActLimitTop1:

[0029]

[0030] Further, step S3 also includes:

[0031] According to the grid energy storage requirements, calculate the wind farm adjustable active power after deducting the energy storage power, that is, the total adjustable active power emsActLimitTop2:

[0032] emsActLimitTop2=emsActLimitTop1-fWFContractCapacity*K

[0033] When storing energy, the active power execution target value emsActSend of the wind farm is calculated, and the smaller of the grid AGC active power command value emsGridDispatchAct and the adjustable active power of the whole farm emsActLimitTop2 is taken: emsActSend = min(emsGridDispatchAct, emsActLimitTop2).

[0034] Furthermore, in step S3, the default configuration of K is 0.06.

[0035] Furthermore, after step S4, the following steps are also included: S5, judging whether the regulation cycle is reached, if the regulation cycle is reached, returning to step S1, if the regulation cycle is not reached, waiting.

[0036] It can be seen from the above technical scheme that the beneficial effects of the present invention are as follows: the present invention provides an energy storage control method based on adjustable power of a wind farm, comprising the following steps: obtaining the real-time wind speed of each wind turbine in the wind farm, ensuring the power curve, the controlled state of the active power of the unit, the maximum active power setting feedback power of the unit, the installed capacity of the wind farm, the energy storage ratio K and the AGC active power command value of the power grid; calculating the theoretical active power of a single unit based on the parameters obtained in step S1, and at the same time deriving the adjustable active power of a single unit in combination with the controlled state of the unit, and calculating the adjustable active power of a single unit in the whole field. Active power is accumulated to obtain the adjustable active power of the whole field, and according to the calculation formula: adjustable active power of the whole field - wind farm installed capacity * K = adjustable active power of the whole field, the adjustable active power of the whole field is obtained; it is judged whether the adjustable active power of the whole field is greater than or equal to the installed capacity of the wind farm * (0.2 + K). If it is greater than or equal to, the smaller value of the grid AGC active power command value and the adjustable active power of the whole field is taken as the active power execution target value of the wind farm; the active power execution target value of a single wind farm is sent to the unit for active power control. Under the premise of meeting the control requirements of the power grid, part of the energy is automatically stored to meet the increase of the wind farm power requirements during the disturbance of the wind farm frequency, which greatly improves the overall grid adaptability of the wind farm and provides a certain guarantee for the safety of the wind farm grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0038] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0040] See also Figure 1 As shown, the present invention provides an energy storage control method based on adjustable power of a wind farm, comprising the following steps:

[0041] S1. Obtain the real-time wind speed of each wind turbine in the wind farm, guaranteed power curve, active power control state of the turbine, maximum active power setting feedback power of the turbine, installed capacity of the wind farm, energy storage ratio K, and active power command value of the power grid AGC;

[0042] S11, obtaining the wind farm frequency regulation energy storage enabling switch information, the power grid primary frequency regulation trigger signal and the energy storage trigger signal;

[0043] S12, determine whether the wind farm frequency regulation and energy storage enable switch is turned on, if it is turned on, go to step S13, if not, return to step S11; collect software configuration item data to clarify whether the wind farm frequency regulation and energy storage enable switch enableEs is turned on, the system configuration is True for on, False for off.

[0044] S13, determine whether the primary frequency modulation of the power grid is triggered. If the primary frequency modulation is not triggered, go to step S14, if the primary frequency modulation is triggered, return to step S11; obtain the primary frequency modulation trigger signal emsIsFreMod from the power grid, and execute the primary frequency modulation action of the power grid if the accepted data is True, and do not execute the primary frequency modulation action if it is False.

[0045] S14, determine whether the energy storage trigger signal is triggered, if triggered, go to step S2, if not triggered, return to step S11. The determination of whether the energy storage trigger signal is triggered also includes obtaining the energy storage trigger signal energyStorageEnable from the power grid, and if the received data is True, the power grid requires the energy storage action to be performed in the case of non-primary frequency modulation, and if it is False, the energy storage action is not performed.

[0046] The system must meet the following conditions to enable the frequency modulation and energy storage function:

[0047] Condition 1: The wind farm frequency regulation and energy storage enable switch is triggered, that is, enableEs = True; the grid frequency regulation trigger signal and energy storage trigger signal are judged again;

[0048] Condition 2: The primary frequency modulation trigger signal is not triggered, that is, emsIsFreMod = False;

[0049] Condition 3: The energy storage trigger signal is triggered, i.e. energyStorageEnable = True;

[0050] Condition 4: The total adjustable active power of the whole field is ≥ the installed capacity of the wind farm*(0.2+K), that is, emsActLimitTop1≥fWFContractCapacity*(0.2+K).

[0051] When conditions 1, 2, 3 and 4 are met at the same time, the system determines that it has entered the energy storage state, and uses the wind farm active power execution target value emsActSend to perform periodic adjustment and distribution of the active power of all wind turbines in the field, and finally achieves the wind farm energy storage requirements.

[0052] S2, based on the parameters obtained in step S1, the theoretical active power of a single unit is calculated, and the adjustable active power of a single unit is obtained in combination with the controlled state of the unit, and the adjustable active power of the single unit of the whole field is accumulated to obtain the adjustable active power of the whole field one, and according to the calculation formula: the adjustable active power of the whole field one - the installed capacity of the wind farm * K = the adjustable active power of the whole field two, the adjustable active power of the whole field two is obtained;

[0053] By obtaining the i-th wind speed emsWinSpd_i, searching in the power curve powCurve, we can obtain the theoretical active power that each unit can generate at the current wind speed, the theoretical active power of each unit wOughtPower_i;

[0054] Then the theoretical active power of the single machine, the active power controlled state of the unit emsRun_i and the maximum active power setting feedback power emsActPowerRead_i of the unit are calculated.

[0055] The adjustable active power of a single machine is obtained as follows:

[0056] That is, when emsRun_i=±1, mOughtPowerT_i=wOughtPower_i;

[0057] When emsRun_i≠±1, mOughtPowerT_i=emsActPowerRead_i;

[0058] If the number of wind turbines in a wind farm is n, the total adjustable active power of all turbines is accumulated to obtain the total adjustable active power -emsActLimitTop1:

[0059]

[0060] S3, determine whether the total adjustable active power 1 is greater than or equal to the installed capacity of the wind farm * (0.2 + K), if it is greater than or equal to, then take the smaller value of the grid AGC active power command value and the total adjustable active power 2 as the wind farm active power execution target value;

[0061] According to the grid energy storage requirements, calculate the wind farm adjustable active power after deducting the energy storage power, that is, the total adjustable active power emsActLimitTop2:

[0062] emsActLimitTop2=emsActLimitTop1-fWFContractCapacity*K

[0063] When storing energy, the active power execution target value emsActSend of the wind farm is calculated, and the smaller of the grid AGC active power command value emsGridDispatchAct and the adjustable active power of the whole farm emsActLimitTop2 is taken: emsActSend = min(emsGridDispatchAct, emsActLimitTop2).

[0064] In order to cope with the possible adjustment of the power grid to the energy storage ratio of wind farms, the program sets a configurable energy storage ratio K. According to the current power grid requirements, the energy storage ratio is 6% of the wind farm capacity, that is, K is configured to 0.06 by default.

[0065] S4. Send the active power execution target value of a single wind turbine to the unit for active power control.

[0066] S5, determine whether the regulation cycle is reached, if the regulation cycle is reached, return to step S1, if the regulation cycle is not reached, wait until the regulation cycle is reached and then return to step S.

[0067] The present invention realizes the design of the wind farm storage part active power, the design of the active power control cycle, the step-by-step power generation grid target, and the reservation of protection adjustment time to ensure that the wind farm active power meets the grid requirements; by independently setting the active power adjustment slope method of each unit in each cycle, the stability of the wind farm voltage is guaranteed.

[0068] Under the premise of meeting the grid control requirements, the present invention automatically stores part of the energy to meet the increased power requirements of the wind farm during the downdisturbance of the wind farm frequency, which greatly improves the overall grid adaptability of the wind farm and provides a certain guarantee for the safety of the wind farm grid.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for controlling energy storage based on adjustable power of a wind farm, characterized in that: The steps include: S1. Obtain the real-time wind speed of each wind turbine in the wind farm, guaranteed power curve, active power control state of the turbine, maximum active power setting feedback power of the turbine, installed capacity of the wind farm, energy storage ratio K, and active power command value of the power grid AGC; S2, based on the parameters obtained in step S1, the theoretical active power of a single unit is calculated, and the adjustable active power of a single unit is obtained in combination with the controlled state of the unit, and the adjustable active power of the single unit of the whole field is accumulated to obtain the adjustable active power of the whole field one, and according to the calculation formula: the adjustable active power of the whole field one - the installed capacity of the wind farm * K = the adjustable active power of the whole field two, the adjustable active power of the whole field two is obtained; S3, determine whether the total adjustable active power 1 is greater than or equal to the installed capacity of the wind farm * (0.2 + K), if it is greater than or equal to, then take the smaller value of the grid AGC active power command value and the total adjustable active power 2 as the wind farm active power execution target value; S4. Send the active power execution target value of a single wind turbine to the unit for active power control.

2. The energy storage control method based on adjustable power of a wind farm according to claim 1, characterized in that: Step S1 also includes: S11, obtaining the wind farm frequency regulation energy storage enabling switch information, the power grid primary frequency regulation trigger signal and the energy storage trigger signal; S12, determining whether the wind farm frequency regulation energy storage enable switch is turned on, if it is turned on, proceeding to step S13, if not, returning to step S11; S13, judging whether the primary frequency modulation of the power grid is triggered, if the primary frequency modulation is not triggered, proceeding to step S14, if the primary frequency modulation is triggered, returning to step S11; S14, determine whether the energy storage trigger signal is triggered, if triggered, go to step S2, if not triggered, return to step S11.

3. The energy storage control method based on adjustable power of a wind farm according to claim 2, characterized in that: The determining whether the wind farm frequency regulation and energy storage enable switch is turned on also includes collecting software configuration item data to clarify whether the wind farm frequency regulation and energy storage enable switch enableEs is turned on, and the system configuration is True for on and False for off.

4. The energy storage control method based on adjustable power of a wind farm according to claim 2, characterized in that: The determining whether the primary frequency modulation action of the power grid is executed also includes obtaining a primary frequency modulation trigger signal emsIsFreMod from the power grid, and executing the primary frequency modulation action of the power grid if the received data is True, and not executing the primary frequency modulation action if the received data is False.

5. The energy storage control method based on adjustable power of a wind farm according to claim 2, characterized in that: The determining whether the energy storage trigger signal is triggered also includes obtaining an energy storage trigger signal energyStorageEnable from the power grid, and accepting data as True if the power grid requires the execution of an energy storage action in a non-primary frequency modulation trigger situation, and accepting data as False if the energy storage action is not executed.

6. The energy storage control method based on adjustable power of a wind farm according to claim 5, characterized in that: The system must meet the following conditions to enable the frequency modulation and energy storage function: The wind farm frequency regulation and energy storage enable switch is triggered, that is, enableEs = True; the power grid frequency regulation trigger signal and energy storage trigger signal are judged again; The frequency modulation trigger signal is not triggered, that is, emsIsFreMod = False; The energy storage trigger signal is triggered, that is, energyStorageEnable = True; The total adjustable active power of the whole field is ≥ the installed capacity of the wind farm*(0.2+K), that is, emsActLimitTop1≥fWFContractCapacity*(0.2+K).

7. The energy storage control method based on adjustable power of a wind farm according to claim 1, characterized in that: Step S2 also includes: By obtaining the i-th wind speed emsWinSpd_i, searching in the power curve powCurve, we can obtain the theoretical active power that each unit can generate at the current wind speed, the theoretical active power of each unit wOughtPower_i; Then the theoretical active power of the single machine, the active power controlled state of the unit emsRun_i and the maximum active power setting feedback power emsActPowerRead_i of the unit are calculated. The adjustable active power of a single machine is obtained as follows: That is, when emsRun_i=±1, mOughtPowerT_i=wOughtPower_i; When emsRun_i≠±1, mOughtPowerT_i=emsActPowerRead_i; If the number of wind turbines in a wind farm is n, the total adjustable active power of all turbines is accumulated to obtain the total adjustable active power -emsActLimitTop1:

8. The energy storage control method based on wind farm adjustable power according to claim 1 is characterized in that: Step S3 also includes: Fully adjustable active power 2emsActLimitTop2: emsActLimitTop2=emsActLimitTop1-fWFContractCapacity*K When storing energy, the active power execution target value emsActSend of the wind farm is calculated by taking the smaller of the grid AGC active power command value emsGridDispatchAct and the total adjustable active power emsActLimitTop2: emsActSend = min(emsGridDispatchAct, emsActLimitTop2), where emsActLimitTop1 is the total adjustable active power, and fWFContractCapacity is the installed capacity of the wind farm.

9. The energy storage control method based on adjustable power of a wind farm according to claim 8, characterized in that: In step S3, the default configuration of K is 0.

06.

10. The energy storage control method based on wind farm adjustable power according to claim 1, characterized in that: The following steps are also included after step S4: S5, judging whether the regulation cycle is reached, if the regulation cycle is reached, returning to step S1, if the regulation cycle is not reached, waiting.

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