A wind energy storage primary frequency regulation power distribution method, system and electronic device

Abstract

The present invention provides a wind energy storage primary frequency regulation power distribution method, system and electronic device, belonging to the field of primary frequency regulation. The method includes: obtaining the frequency deviation value of the power system at the initial moment within the current sampling period; if the frequency deviation value exceeds the primary frequency regulation dead zone, determining the primary frequency regulation power of the wind farm according to the frequency deviation value; determining the upward frequency regulation capacity and downward frequency regulation capacity corresponding to each wind turbine according to the basic parameters of each wind turbine; determining the upward frequency regulation capacity and downward frequency regulation capacity corresponding to each energy storage device according to the basic parameters of each energy storage device; determining the final frequency regulation capacity of each wind turbine and each energy storage device within the current sampling period according to the primary frequency regulation power of the wind farm, the upward frequency regulation capacity and downward frequency regulation capacity of each wind turbine and each energy storage device, so as to perform primary frequency regulation until the primary frequency regulation ends when the initial moment is greater than the total frequency regulation duration. The present invention improves the frequency stability when the wind farm participates in the primary frequency regulation of the power grid.

Description

Technical Field

[0001] The present invention relates to the field of primary frequency modulation, and in particular to a primary frequency modulation power distribution method, system and electronic device for wind power storage based on overspeed load shedding and frequency modulation capacity. Background Art

[0002] The installed capacity of renewable energy sources such as wind power and photovoltaic power is increasing continuously, and the penetration rate of wind power is increasing year by year. The intermittency, volatility and unpredictability of its output pose challenges to the safe and stable operation of the power grid. Among them, maintaining frequency stability is one of the key factors for the safe and stable operation of the power grid. On the one hand, the standards for the technical regulations on the access of wind farms to the power system put forward certain requirements for the fast frequency modulation technology of wind farms. Wind turbines have begun to change from "passive adaptation" to "active support" and need to have a certain fast frequency modulation ability. On the other hand, as one of the key technologies for building a new power system, the excellent frequency modulation performance of the energy storage system can assist the wind farm to improve the frequency modulation performance and solve the problems brought by the grid connection of renewable energy. The power grid has certain requirements for the primary frequency modulation ability of wind farms to access the power system. Therefore, the research on the primary frequency modulation power distribution method can be carried out by combining the frequency modulation capacity of the wind turbine itself and the frequency modulation capacity of the energy storage.

[0003] In the context of large-scale wind power access to the power system, the technologies for realizing primary frequency modulation of wind farms mainly include: (1) reserving active power reserve through overspeed control. In the case of overspeed load shedding control, the wind turbine does not operate at the maximum power point (Maximum Power Point Tracking, MPPT), but reserves reserve by reducing active power output and increasing rotor speed to increase rotational kinetic energy. The load shedding rate can be calculated by the current operating output and the output at the maximum power point. However, this method has a limited adjustment range and will affect the power generation of the wind turbine; (2) reserving active power reserve through pitch control, adjusting the pitch angle of the blade, changing the angle of attack of the airflow on the blade to reserve reserve. This control strategy can achieve load shedding operation at all wind speeds. However, due to the control structure being mechanical components, it has the disadvantages of slow response speed, easy wear due to frequent pitching, and limited adjustment ability; (3) the method of configuring energy storage, using the flexible and rapid power response characteristics of energy storage to assist wind turbines to participate in frequency modulation. However, the current cost of energy storage is still relatively high, and the frequency modulation characteristics of the wind turbine itself cannot be effectively utilized, and the optimal operation of the wind turbine and the energy storage cannot be realized.

[0004] There are certain technical or economic problems with only the above-mentioned one method. The above methods can also be combined to participate in frequency modulation together. However, the current method of combining reserve reservation and energy storage configuration has problems such as complex solution process, large solution calculation, large prediction deviation, and many listed constraint conditions, and it is impossible to quickly and simply obtain the power of the wind turbine and the energy storage device when participating in frequency modulation according to the primary frequency modulation requirements of the power grid. Summary of the Invention

[0005] The object of the present invention is to provide a wind-storage primary frequency regulation power distribution method, system and electronic device, which can improve the frequency stability when a wind farm participates in the primary frequency regulation of the power grid.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A wind-storage primary frequency regulation power distribution method includes:

[0008] For the initial moment within the current sampling period, obtain the frequency deviation value of the power system at the initial moment;

[0009] Judge whether the frequency deviation value exceeds the primary frequency regulation dead zone. If the frequency deviation value does not exceed the primary frequency regulation dead zone, obtain the frequency deviation value at the initial moment within the next sampling period. If the frequency deviation value exceeds the primary frequency regulation dead zone, determine the primary frequency regulation power of the wind farm according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind farm and the regulation rate.

[0010] Obtain the basic parameters of each wind turbine in the wind farm at the initial moment; the basic parameters of the wind turbine include the initial output of the wind turbine, the maximum operating output when the wind turbine operates at the maximum power point, and the minimum operating output of the wind turbine under the maximum load shedding rate.

[0011] For any wind turbine, determine the upward frequency regulation capacity and downward frequency regulation capacity of the wind turbine according to the basic parameters of the wind turbine.

[0012] Obtain the basic parameters of each energy storage device participating in frequency regulation in the wind farm at the initial moment; the basic parameters of the energy storage device include the output of the energy storage device, the maximum charging power and the maximum discharging power.

[0013] For any energy storage device, determine the upward frequency regulation capacity and downward frequency regulation capacity of the energy storage device according to the basic parameters of the energy storage device.

[0014] According to the primary frequency regulation power of the wind farm, the upward frequency regulation capacities of each wind turbine, the downward frequency regulation capacities of each wind turbine, the upward frequency regulation capacities of each energy storage device and the downward frequency regulation capacities of each energy storage device, determine the final frequency regulation capacities of each wind turbine and each energy storage device within the current sampling period for primary frequency regulation.

[0015] Judge whether the initial moment is greater than the total frequency regulation duration. If so, end the primary frequency regulation. Otherwise, obtain the frequency deviation value of the power system at the initial moment within the next sampling period and perform the primary frequency regulation for the next sampling period.

[0016] Optionally, the primary frequency regulation power of the wind farm is calculated using the following formula:

[0017]

[0018] Where, P f is the primary frequency regulation power of the wind farm, △f is the frequency deviation value, R is the droop coefficient, f N is the rated frequency of the power system, P w is the rated power of the wind farm, || represents taking the absolute value.

[0019] Optionally, obtain the basic parameters of each wind turbine in the wind farm at the initial moment, specifically including:

[0020] Obtain the maximum load shedding rate of each wind turbine, the maximum operating output when each wind turbine operates at the maximum power point, the wind speed of each wind turbine at the initial moment, and the initial operating load shedding rate at the corresponding wind speed;

[0021] For any wind turbine, calculate the initial output of the wind turbine according to the initial operating load shedding rate of the wind turbine and the maximum operating output when the wind turbine operates at the maximum power point;

[0022] Calculate the minimum operating output of the wind turbine at the maximum load shedding rate according to the maximum load shedding rate of the wind turbine and the maximum operating output when the wind turbine operates at the maximum power point.

[0023] Optionally, use the formula P wind_i =(1 - d o_i )×P opt_i to calculate the initial output of the i-th wind turbine; where, P wind_i is the initial output of the i-th wind turbine, d o_i is the initial operating load shedding rate of the i-th wind turbine, P opt_i is the maximum operating output when the i-th wind turbine operates at the maximum power point;

[0024] Use the formula P min_i =(1 - d max_i )×P opt_i to calculate the minimum operating output of the i-th wind turbine at the maximum load shedding rate; where, P min_i is the minimum operating output of the i-th wind turbine at the maximum load shedding rate, d max_i is the maximum load shedding rate of the i-th wind turbine.

[0025] Optionally, use the formula C wup_i =P opt_i -P wind_i to determine the upward frequency regulation capacity of the i-th wind turbine; use the formula C wdn_i= P wind_i -P min_i Determine the downward frequency regulation capacity of the i-th wind turbine generator;

[0026] where C wup_i is the upward frequency regulation capacity of the i-th wind turbine generator, C wdn_i is the downward frequency regulation capacity of the i-th wind turbine generator, P opt_i is the maximum operating output when the i-th wind turbine generator operates at the maximum power point, P wind_i is the initial output of the i-th wind turbine generator, P min_i is the minimum operating output of the i-th wind turbine generator under the maximum load shedding rate.

[0027] Optionally, use the formula C sup_j = P smax_j -P st_j to determine the upward frequency regulation capacity of the j-th energy storage device; use the formula C sdn_j = P st_j -P smin_j to determine the downward frequency regulation capacity of the j-th energy storage device;

[0028] where C sup_j is the upward frequency regulation capacity of the j-th energy storage device, C sdn_j is the downward frequency regulation capacity of the j-th energy storage device, P smax_j is the maximum discharge power of the j-th energy storage device, P st_j is the output of the j-th energy storage device, P smin_j is the maximum charging power of the j-th energy storage device.

[0029] Optionally, according to the primary frequency regulation power of the wind farm, the upward frequency regulation capacities of each wind turbine generator, the downward frequency regulation capacities of each wind turbine generator, the upward frequency regulation capacities of each energy storage device, and the downward frequency regulation capacities of each energy storage device, determine the final frequency regulation capacities of each wind turbine generator and each energy storage device in the current sampling period, specifically including:

[0030] If the primary frequency regulation power of the wind farm is less than 0, each wind turbine generator and each energy storage device participate in upward frequency regulation, and the final frequency regulation capacities of each wind turbine generator and each energy storage device are the final upward frequency regulation capacities;

[0031] According to the first frequency regulation power of the wind farm, the upward frequency regulation capacities of each wind turbine generator, and the upward frequency regulation capacities of each energy storage device, determine the final upward frequency regulation capacities of each wind turbine generator and the final upward frequency regulation capacities of each energy storage device in the current sampling period;

[0032] If the primary frequency regulation power of the wind farm is greater than 0, each wind turbine generator and each energy storage device participate in downward frequency regulation, and the final frequency regulation capacities of each wind turbine generator and each energy storage device are the final downward frequency regulation capacities;

[0033] Determine the final downward frequency regulation capacity of each wind turbine and the final downward frequency regulation capacity of each energy storage device within the current sampling period according to the first frequency regulation power of the wind farm, the downward frequency regulation capacity of each wind turbine, and the downward frequency regulation capacity of each energy storage device.

[0034] Optionally, the following formula is used to determine the final upward frequency regulation capacity of the i-th wind turbine:

[0035]

[0036] The following formula is used to determine the final upward frequency regulation capacity of the j-th energy storage device:

[0037]

[0038] Where CC wup_i is the final upward frequency regulation capacity of the i-th wind turbine, CC sup_j is the final upward frequency regulation capacity of the j-th energy storage device, C wup_i is the upward frequency regulation capacity of the i-th wind turbine, P f is the primary frequency regulation power of the wind farm, N wind is the number of wind turbines in the wind farm, N st is the number of energy storage devices in the wind farm, C sup_j is the upward frequency regulation capacity of the j-th energy storage device.

[0039] To achieve the above object, the present invention also provides the following solution:

[0040] A wind-storage primary frequency regulation power distribution system, comprising:

[0041] A frequency deviation acquisition unit, configured to acquire the frequency deviation value of the power system at the initial moment within the current sampling period for the initial moment;

[0042] A frequency modulation dead zone judgment unit, connected to the deviation acquisition unit, configured to judge whether the frequency deviation value exceeds the primary frequency modulation dead zone. If the frequency deviation value does not exceed the primary frequency modulation dead zone, acquire the frequency deviation value at the initial moment within the next sampling period;

[0043] A frequency modulation power determination unit, connected to the dead zone judgment unit, configured to, if the frequency deviation value exceeds the primary frequency modulation dead zone, determine the primary frequency modulation power of the wind farm according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind farm, and the regulation rate;

[0044] A fan parameter acquisition unit for acquiring the basic parameters of each wind turbine in the wind farm at the initial moment; the basic parameters of the wind turbine include the initial output of the wind turbine, the maximum operating output when the wind turbine operates at the maximum power point, and the minimum operating output of the wind turbine at the maximum load shedding rate;

[0045] A fan frequency modulation determination unit, connected to the fan parameter acquisition unit, for determining the upward frequency modulation capacity and the downward frequency modulation capacity of any wind turbine according to the basic parameters of the wind turbine;

[0046] An energy storage parameter acquisition unit for acquiring the basic parameters of each energy storage device participating in frequency modulation in the wind farm at the initial moment; the basic parameters of the energy storage device include the output of the energy storage device, the maximum charging power, and the maximum discharging power;

[0047] An energy storage frequency modulation determination unit, connected to the energy storage parameter acquisition unit, for determining the upward frequency modulation capacity and the downward frequency modulation capacity of any energy storage device according to the basic parameters of the energy storage device;

[0048] A frequency modulation unit, respectively connected to the frequency modulation power determination unit, the fan frequency modulation determination unit, and the energy storage frequency modulation determination unit, for determining the final frequency modulation capacity of each wind turbine and each energy storage device in the current sampling period according to the primary frequency modulation power of the wind farm, the upward frequency modulation capacity of each wind turbine, the downward frequency modulation capacity of each wind turbine, the upward frequency modulation capacity of each energy storage device, and the downward frequency modulation capacity of each energy storage device, so as to perform primary frequency modulation;

[0049] An iteration unit, respectively connected to the frequency modulation unit and the frequency deviation acquisition unit, for determining whether the initial moment is greater than the total frequency modulation duration. If so, end the primary frequency modulation. Otherwise, obtain the frequency deviation value of the power system at the initial moment in the next sampling period and perform the primary frequency modulation in the next sampling period.

[0050] To achieve the above object, the present invention also provides the following solutions:

[0051] An electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the above-mentioned wind-storage primary frequency modulation power distribution method.

[0052] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0053] The present invention combines the upward / downward frequency modulation capacities of a wind turbine and an energy storage device, dynamically adjusts the operating output of the wind turbine based on the load shedding rate, and improves the efficiency of primary frequency modulation power distribution on the basis of taking into account the frequency modulation capabilities of the wind turbine and the energy storage device. By means of an overspeed load shedding control method, the wind turbine reserves a certain amount of upward frequency modulation capacity and downward frequency modulation capacity. Combining the frequency modulation capacities of each wind turbine and each energy storage device, the primary frequency modulation capacity of a wind farm with an energy storage device is improved. While solving the problem of primary frequency modulation power distribution, the safe and stable connection of the wind farm to the power grid is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0055] Figure 1 It is a flowchart of the wind storage primary frequency modulation power distribution method of the present invention;

[0056] Figure 2 It is a schematic diagram of the modules of the wind storage primary frequency modulation power distribution system of the present invention.

[0057] Symbol Explanation:

[0058] Frequency deviation acquisition unit - 1, frequency modulation dead zone judgment unit - 2, frequency modulation power determination unit - 3, fan parameter acquisition unit - 4, fan frequency modulation determination unit - 5, energy storage parameter acquisition unit - 6, energy storage frequency modulation determination unit - 7, frequency modulation unit - 8, iteration unit - 9. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0060] The object of the present invention is to provide a wind-storage primary frequency regulation power distribution method, system and electronic device. Based on the overspeed load shedding control of wind turbines and the method of configuring energy storage, a power distribution method for a wind farm with energy storage devices to participate in primary frequency regulation is studied, so as to maintain the stability of the power grid frequency, scientifically and efficiently solve the frequency stability and power distribution problems when the wind farm participates in the primary frequency regulation of the power grid, and further realize the large-scale safe and stable connection of the wind farm or a large number of distributed wind turbines to the power grid, with the advantages of primary frequency regulation ability, actively supporting the power grid and autonomous operation.

[0061] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] Embodiment 1

[0063] As Figure 1 shown, this embodiment provides a wind-storage primary frequency regulation power distribution method, including:

[0064] S1: For the initial moment (t moment, the initial value of t is 0) within the current sampling period, obtain the frequency deviation value △f of the power system at the initial moment.

[0065] S2: Judge whether the frequency deviation value exceeds the primary frequency regulation dead zone. If the frequency deviation value does not exceed the primary frequency regulation dead zone, obtain the frequency deviation value at the initial moment in the next sampling period.

[0066] S3: If the frequency deviation value exceeds the primary frequency regulation dead zone, determine the primary frequency regulation power of the wind farm according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind farm and the droop coefficient. That is, if the frequency deviation value exceeds the primary frequency regulation dead zone, the wind farm with energy storage devices participates in frequency regulation.

[0067] Specifically, the following formula is used to calculate the primary frequency regulation power of the wind farm:

[0068]

[0069] Among them, P f is the primary frequency regulation power of the wind farm, △f is the frequency deviation value, R is the droop coefficient, f N is the rated frequency of the power system, P w is the rated power of the wind farm, and || is to take the absolute value.

[0070] S4: Obtain the basic parameters of each wind turbine in the wind farm at the initial moment.

[0071] In this embodiment, the basic parameters of the wind turbine include the initial output of the wind turbine, the maximum operating output when the wind turbine operates at the maximum power point, and the minimum operating output of the wind turbine at the maximum load shedding rate.

[0072] Further, step S4 includes:

[0073] S41: Obtain the maximum load shedding rate of each wind turbine, the maximum operating output when each wind turbine operates at the maximum power point, the wind speed v of each wind turbine at the initial moment i and the initial operating load shedding rate at the corresponding wind speed. In this embodiment, it is assumed that the wind speed of the wind turbine remains unchanged within each sampling period.

[0074] S42: For any wind turbine, calculate the initial output of the wind turbine according to the initial operating load shedding rate of the wind turbine and the maximum operating output when the wind turbine operates at the maximum power point. Specifically, use the formula P wind_i =(1 - d o_i )×P opt_i to calculate the initial output of the i-th wind turbine. Wherein, P wind_i is the initial output of the i-th wind turbine, d o_i is the initial operating load shedding rate of the i-th wind turbine, which can be determined by a fixed load shedding rate or a variable load shedding rate curve referring to some literature units, 0 ≤ d o_i ≤ d max_i , P opt_i is the maximum operating output when the i-th wind turbine operates at the maximum power point.

[0075] S43: Calculate the minimum operating output of the wind turbine at the maximum load shedding rate according to the maximum load shedding rate of the wind turbine and the maximum operating output when the wind turbine operates at the maximum power point.

[0076] Specifically, use the formula P min_i =(1 - d max_i )×P opt_i to calculate the minimum operating output of the i-th wind turbine at the maximum load shedding rate. Wherein, P min_i is the minimum operating output of the i-th wind turbine at the maximum load shedding rate d max_i , d max_i is the maximum load shedding rate of the i-th wind turbine (0 ≤ d max_i ≤ 1).

[0077] S5: For any wind turbine, determine the upward frequency modulation capacity and the downward frequency modulation capacity of the wind turbine according to the basic parameters of the wind turbine.

[0078] Specifically, use the formula C wup_i = Popt_i -P wind_i Determine the upward frequency regulation capacity of the \(i\)-th wind turbine. Use the formula \(C\) wdn_i =P wind_i -P min_i Determine the downward frequency regulation capacity of the \(i\)-th wind turbine.

[0079] Where, \(C\) wup_i is the upward frequency regulation capacity of the \(i\)-th wind turbine, \(C\) wdn_i is the downward frequency regulation capacity of the \(i\)-th wind turbine, \(P\) opt_i is the maximum operating output when the \(i\)-th wind turbine operates at the maximum power point, \(P\) wind_i is the initial output of the \(i\)-th wind turbine, \(P\) min_i is the minimum operating output of the \(i\)-th wind turbine under the maximum load shedding rate.

[0080] S6: Obtain the basic parameters of each energy storage device participating in frequency regulation in the wind farm at the initial moment. The basic parameters of the energy storage device include the output, maximum charging power, maximum discharging power, rated power, and state of charge of the energy storage device.

[0081] S7: For any energy storage device, determine the upward frequency regulation capacity and downward frequency regulation capacity of the energy storage device according to the basic parameters of the energy storage device.

[0082] Specifically, use the formula \(C\) sup_j =P smax_j -P st_j to determine the upward frequency regulation capacity of the \(j\)-th energy storage device. Use the formula \(C\) sdn_j =P st_j -P smin_j to determine the downward frequency regulation capacity of the \(j\)-th energy storage device.

[0083] Where, \(C\) sup_j is the upward frequency regulation capacity of the \(j\)-th energy storage device, \(C\) sdn_j is the downward frequency regulation capacity of the \(j\)-th energy storage device, \(P\) smax_j is the maximum discharging power of the \(j\)-th energy storage device, \(P\) st_j is the output of the \(j\)-th energy storage device, \(P\) smin_j is the maximum charging power of the \(j\)-th energy storage device.

[0084] The upward / downward frequency regulation capacity of the wind turbine / energy storage device represents the capacity that the wind turbine / energy storage device can perform upward / downward frequency regulation within the current sampling period.

[0085] S8: Determine the final frequency regulation capacity of each wind turbine and each energy storage device within the current sampling period based on the primary frequency regulation power of the wind farm, the upward frequency regulation capacity of each wind turbine, the downward frequency regulation capacity of each wind turbine, the upward frequency regulation capacity of each energy storage device, and the downward frequency regulation capacity of each energy storage device, so as to perform primary frequency regulation. The final frequency regulation capacity of each wind turbine and each energy storage device represents the frequency regulation capacity that each wind turbine and each energy storage device need to provide, that is, the power distribution result of each wind turbine and each energy storage device.

[0086] Further, when the primary frequency regulation power is less than 0, the wind farm with energy storage devices needs to participate in upward frequency regulation. When the primary frequency regulation power is greater than 0, the wind farm with energy storage devices needs to participate in downward frequency regulation. Step S8 specifically includes:

[0087] S81: If the primary frequency regulation power of the wind farm is less than 0, then each wind turbine and each energy storage device participate in upward frequency regulation, and the final frequency regulation capacity of each wind turbine and each energy storage device is the final upward frequency regulation capacity.

[0088] S82: Determine the final upward frequency regulation capacity of each wind turbine and the final upward frequency regulation capacity of each energy storage device within the current sampling period according to the first frequency regulation power of the wind farm, the upward frequency regulation capacity of each wind turbine, and the upward frequency regulation capacity of each energy storage device.

[0089] In this embodiment, the following formula is used to determine the final upward frequency regulation capacity of the i-th wind turbine:

[0090]

[0091] The following formula is used to determine the final upward frequency regulation capacity of the j-th energy storage device:

[0092]

[0093] where, CC wup_i is the final upward frequency regulation capacity of the i-th wind turbine, CC sup_j is the final upward frequency regulation capacity of the j-th energy storage device, C wup_i is the upward frequency regulation capacity of the i-th wind turbine, P f is the primary frequency regulation power of the wind farm, N wind is the number of wind turbines in the wind farm, N st is the number of energy storage devices in the wind farm, C sup_j is the upward frequency regulation capacity of the j-th energy storage device, i = 1, 2, …, N wind , j = 1, 2, …, N st .

[0094] S83: If the primary frequency regulation power of the wind farm is greater than 0, each wind turbine and each energy storage device participate in downward frequency regulation, and the final frequency regulation capacity of each wind turbine and each energy storage device is the final downward frequency regulation capacity.

[0095] S84: Determine the final downward frequency regulation capacity of each wind turbine and each energy storage device within the current sampling period according to the first frequency regulation power of the wind farm, the downward frequency regulation capacity of each wind turbine, and the downward frequency regulation capacity of each energy storage device.

[0096] In this embodiment, the following formula is used to determine the final downward frequency regulation capacity of the i-th wind turbine:

[0097]

[0098] The following formula is used to determine the final downward frequency regulation capacity of the j-th energy storage device:

[0099]

[0100] Among them, CC wdn_i is the final downward frequency regulation capacity of the i-th wind turbine, and CC sdn_j is the final downward frequency regulation capacity of the j-th energy storage device.

[0101] S9: Determine whether the initial moment is greater than the total frequency regulation duration. If so, end the primary frequency regulation; otherwise, obtain the frequency deviation value of the power system at the initial moment in the next sampling period and perform primary frequency regulation in the next sampling period. Specifically, if t is less than the total frequency regulation duration T z , then proceed to the next sampling period, t = t + T, where T is the time length of one sampling period, and repeat steps S1 - S9; if t is greater than or equal to the total frequency regulation duration T z , then end the process of calculating the power distribution of wind-storage primary frequency regulation.

[0102] Compared with the prior art, the present invention can achieve the following technical effects:

[0103] 1. For the method that only reserves active power reserve, there are problems such as limited adjustment range, affecting the power generation of the unit, and slow response speed. The present invention combines the frequency regulation capacity of the energy storage device to better improve the ability and flexibility of the wind farm to participate in frequency regulation. By utilizing the frequency regulation ability of the energy storage, the adjustable range is increased and the impact on the power generation of the wind turbine is reduced. The response speed is improved by using the fast response characteristic of the energy storage.

[0104] 2. For the method that only configures energy storage, there are problems such as high cost and the inability to effectively utilize the frequency modulation capacity of the wind turbine itself. The present invention can better utilize the active power reserve capacity of the wind turbine itself in combination with the frequency modulation capacity of the wind turbine, and realize the optimal dispatch when the wind turbine and energy storage participate in primary frequency modulation.

[0105] 3. For the method that combines reserved active power reserve and energy storage, there are currently problems such as complex solution process, large amount of solution calculation, and large prediction deviation. The present invention combines the upward / downward frequency modulation capacities of the wind turbine and the energy storage device, and dynamically adjusts the operating output of the wind turbine based on the initial load shedding rate, realizing fast and simple calculation of the primary frequency modulation distribution method on the basis of taking into account the frequency modulation capabilities of the wind turbine and the energy storage.

[0106] Embodiment 2

[0107] In order to execute the method corresponding to the above Embodiment 1 to achieve the corresponding functions and technical effects, a wind-storage primary frequency modulation power distribution system is provided below.

[0108] As Figure 2 shown, the wind-storage primary frequency modulation power distribution system provided in this embodiment includes: a frequency deviation acquisition unit 1, a frequency modulation dead zone judgment unit 2, a frequency modulation power determination unit 3, a wind turbine parameter acquisition unit 4, a wind turbine frequency modulation determination unit 5, an energy storage parameter acquisition unit 6, an energy storage frequency modulation determination unit 7, a frequency modulation unit 8, and an iteration unit 9.

[0109] Among them, the frequency deviation acquisition unit 1 is used to acquire the frequency deviation value of the power system at the initial moment within the current sampling period.

[0110] The frequency modulation dead zone judgment unit 2 is connected to the frequency deviation acquisition unit 1. The frequency modulation dead zone judgment unit 2 is used to judge whether the frequency deviation value exceeds the primary frequency modulation dead zone. If the frequency deviation value does not exceed the primary frequency modulation dead zone, the frequency deviation value at the initial moment within the next sampling period is acquired.

[0111] The frequency modulation power determination unit 3 is connected to the frequency modulation dead zone judgment unit 2. The frequency modulation power determination unit 3 is used to, if the frequency deviation value exceeds the primary frequency modulation dead zone, determine the primary frequency modulation power of the wind farm according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind farm, and the regulation rate.

[0112] The wind turbine parameter acquisition unit 4 is used to acquire the basic parameters of each wind turbine in the wind farm at the initial moment. The basic parameters of the wind turbine include the initial output of the wind turbine, the maximum operating output when the wind turbine operates at the maximum power point, and the minimum operating output of the wind turbine under the maximum load shedding rate.

[0113] The fan frequency modulation determination unit 5 is connected to the fan parameter acquisition unit 4. The fan frequency modulation determination unit 5 is configured to determine, for any wind turbine, the upward frequency modulation capacity and the downward frequency modulation capacity of the wind turbine according to the basic parameters of the wind turbine.

[0114] The energy storage parameter acquisition unit 6 is configured to acquire the basic parameters of each energy storage device participating in frequency modulation in the wind farm at the initial moment. The basic parameters of the energy storage device include the output of the energy storage device, the maximum charging power, and the maximum discharging power.

[0115] The energy storage frequency modulation determination unit 7 is connected to the energy storage parameter acquisition unit 6. The energy storage frequency modulation determination unit 7 is configured to determine, for any energy storage device, the upward frequency modulation capacity and the downward frequency modulation capacity of the energy storage device according to the basic parameters of the energy storage device.

[0116] The frequency modulation unit 8 is respectively connected to the frequency modulation power determination unit 3, the fan frequency modulation determination unit 5, and the energy storage frequency modulation determination unit 7. The frequency modulation unit 8 is configured to determine the final frequency modulation capacity of each wind turbine and each energy storage device in the current sampling period according to the primary frequency modulation power of the wind farm, the upward frequency modulation capacity of each wind turbine, the downward frequency modulation capacity of each wind turbine, the upward frequency modulation capacity of each energy storage device, and the downward frequency modulation capacity of each energy storage device, so as to perform primary frequency modulation.

[0117] The iteration unit 9 is respectively connected to the frequency modulation unit 8 and the frequency deviation acquisition unit 1. The iteration unit 9 is configured to determine whether the initial moment is greater than the total frequency modulation duration. If so, end the primary frequency modulation. Otherwise, obtain the frequency deviation value of the power system at the initial moment in the next sampling period and perform the primary frequency modulation in the next sampling period.

[0118] Compared with the prior art, the beneficial effects of the wind-storage primary frequency modulation power distribution system provided in this embodiment are the same as those of the wind-storage primary frequency modulation power distribution method provided in Embodiment 1, and will not be elaborated here.

[0119] Embodiment 3

[0120] This embodiment provides an electronic device, including a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the wind-storage primary frequency modulation power distribution method of Embodiment 1.

[0121] Optionally, the above-mentioned electronic device may be a server.

[0122] In addition, an embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the wind-storage primary frequency modulation power distribution method of Embodiment 1 is implemented.

[0123] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0124] In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea. At the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A wind-storage primary frequency regulation power distribution method, characterized in that, The wind-storage primary frequency regulation power distribution method includes: At the initial moment within the current sampling period, obtain the frequency deviation value of the power system at the initial moment. Among them, obtaining the basic parameters of each wind turbine in the wind farm at the initial moment specifically includes: obtaining the maximum load shedding rate of each wind turbine, the maximum operating output when each wind turbine operates at the maximum power point, the wind speed of each wind turbine at the initial moment, and the initial operating load shedding rate at the corresponding wind speed. For any wind turbine, calculate the initial output of the wind turbine according to the initial operating load shedding rate of the wind turbine and the maximum operating output when the wind turbine operates at the maximum power point. Calculate the minimum operating output of the wind turbine at the maximum load shedding rate according to the maximum load shedding rate of the wind turbine and the maximum operating output when the wind turbine operates at the maximum power point. Judge whether the frequency deviation value exceeds the primary frequency regulation dead zone. If the frequency deviation value does not exceed the primary frequency regulation dead zone, obtain the frequency deviation value at the initial moment in the next sampling period. If the frequency deviation value exceeds the primary frequency regulation dead zone, determine the primary frequency regulation power of the wind farm according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind farm, and the regulation rate. Obtain the basic parameters of each wind turbine in the wind farm at the initial moment. The basic parameters of the wind turbine include the initial output of the wind turbine, the maximum operating output when the wind turbine operates at the maximum power point, and the minimum operating output of the wind turbine at the maximum load shedding rate. For any wind turbine, determine the upward frequency regulation capacity and the downward frequency regulation capacity of the wind turbine according to the basic parameters of the wind turbine. Obtain the basic parameters of each energy storage device participating in frequency regulation in the wind farm at the initial moment. The basic parameters of the energy storage device include the output of the energy storage device, the maximum charging power, and the maximum discharging power. For any energy storage device, determine the upward frequency regulation capacity and the downward frequency regulation capacity of the energy storage device according to the basic parameters of the energy storage device. According to the primary frequency regulation power of the wind farm, the upward frequency regulation capacities of each wind turbine, the downward frequency regulation capacities of each wind turbine, the upward frequency regulation capacities of each energy storage device, and the downward frequency regulation capacities of each energy storage device, determine the final frequency regulation capacities of each wind turbine and each energy storage device in the current sampling period for primary frequency regulation. Determining the final frequency regulation capacity of each wind turbine and each energy storage device within the current sampling period specifically includes: If the primary frequency regulation power of the wind farm is less than 0, each wind turbine and each energy storage device participate in upward frequency regulation, and the final frequency regulation capacity of each wind turbine and each energy storage device is the final upward frequency regulation capacity; determining the final upward frequency regulation capacity of each wind turbine and the final upward frequency regulation capacity of each energy storage device within the current sampling period according to the first frequency regulation power of the wind farm, the upward frequency regulation capacity of each wind turbine, and the upward frequency regulation capacity of each energy storage device; If the primary frequency regulation power of the wind farm is greater than 0, each wind turbine and each energy storage device participate in downward frequency regulation, and the final frequency regulation capacity of each wind turbine and each energy storage device is the final downward frequency regulation capacity; determining the final downward frequency regulation capacity of each wind turbine and the final downward frequency regulation capacity of each energy storage device within the current sampling period according to the first frequency regulation power of the wind farm, the downward frequency regulation capacity of each wind turbine, and the downward frequency regulation capacity of each energy storage device; Judging whether the initial moment is greater than the total frequency regulation duration. If so, end the primary frequency regulation; otherwise, obtain the frequency deviation value of the power system at the initial moment in the next sampling period and perform the primary frequency regulation in the next sampling period.

2. The wind-storage primary frequency regulation power distribution method according to claim 1, characterized in that, Calculate the primary frequency regulation power of the wind farm using the following formula: Among them, P f is the primary frequency regulation power of the wind farm, △f is the frequency deviation value, R is the droop coefficient, and f N is the rated frequency of the power system, and P w is the rated power of the wind farm, and || represents taking the absolute value.

3. The wind-storage primary frequency regulation power distribution method according to claim 1, characterized in that, Use the formula P wind_i =(1 - d o_i )×P opt_i to calculate the initial output of the i-th wind turbine; where, P wind_i is the initial output of the i-th wind turbine, d o_i is the initial operation load reduction rate of the i-th wind turbine, and P opt_i is the maximum operation output when the i-th wind turbine operates at the maximum power point; Use the formula P min_i =(1 - d max_i )×P opt_i to calculate the minimum operating output of the i-th wind turbine at the maximum load shedding rate; where P min_i is the minimum operating output of the i-th wind turbine at the maximum load shedding rate, and d max_i is the maximum load shedding rate of the i-th wind turbine.

4. The wind-storage primary frequency regulation power distribution method according to claim 1, characterized in that, Adopt formula C wup_i =P opt_i -P wind_i Determine the upward frequency regulation capacity of the i-th wind turbine; Adopt formula C wdn_i =P wind_i -P min_i Determine the downward frequency regulation capacity of the i-th wind turbine; Among them, C wup_i is the upward frequency regulation capacity of the i-th wind turbine, and C wdn_i is the downward frequency regulation capacity of the i-th wind turbine. P opt_i is the maximum operating output when the i-th wind turbine operates at the maximum power point, and P wind_i is the initial output of the i-th wind turbine, and P min_i is the minimum operating output of the i-th wind turbine under the maximum load shedding rate.

5. The wind-storage primary frequency regulation power distribution method according to claim 1, characterized in that, Use formula C sup_j =P smax_j -P st_j to determine the upward frequency regulation capacity of the j-th energy storage device; Use formula C sdn_j =P st_j -P smin_j to determine the downward frequency regulation capacity of the j-th energy storage device; Among them, C sup_j is the upward frequency regulation capacity of the j-th energy storage device, and C sdn_j is the downward frequency regulation capacity of the j-th energy storage device. P smax_j is the maximum discharge power of the j-th energy storage device, and P st_j is the output of the j-th energy storage device, and P smin_j is the maximum charging power of the j-th energy storage device.

6. The wind-storage primary frequency regulation power distribution method according to claim 1, characterized in that, Determine the final upward frequency regulation capacity of the i-th wind turbine using the following formula: Determine the final upward frequency regulation capacity of the j-th energy storage device using the following formula: Among them, CC wup_i is the final upward frequency regulation capacity of the i-th wind turbine, CC sup_j is the final upward frequency regulation capacity of the j-th energy storage device, C wup_i is the upward frequency regulation capacity of the i-th wind turbine, P f is the primary frequency regulation power of the wind farm, N wind is the number of wind turbines in the wind farm, N st is the number of energy storage devices in the wind farm, C sup_j is the upward frequency regulation capacity of the j-th energy storage device.

7. A wind-storage primary frequency regulation power distribution system, applied to the wind-storage primary frequency regulation power distribution method according to any one of claims 1-6, characterized in that, The wind-storage primary frequency regulation power distribution system includes: A frequency deviation acquisition unit, which is used to obtain the frequency deviation value of the power system at the initial moment for the initial moment within the current sampling period; A frequency modulation dead zone judgment unit, connected to the deviation acquisition unit, which is used to judge whether the frequency deviation value exceeds the primary frequency modulation dead zone. If the frequency deviation value does not exceed the primary frequency modulation dead zone, obtain the frequency deviation value at the initial moment in the next sampling period; A frequency modulation power determination unit, connected to the dead zone judgment unit, which is used to, if the frequency deviation value exceeds the primary frequency modulation dead zone, determine the primary frequency modulation power of the wind farm according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind farm, and the regulation rate; A wind turbine parameter acquisition unit, which is used to obtain the basic parameters of each wind turbine in the wind farm at the initial moment; the basic parameters of the wind turbine include the initial output of the wind turbine, the maximum operating output when the wind turbine operates at the maximum power point, and the minimum operating output of the wind turbine under the maximum load shedding rate; A wind turbine frequency modulation determination unit, connected to the wind turbine parameter acquisition unit, which is used to, for any wind turbine, determine the upward frequency modulation capacity and the downward frequency modulation capacity of the wind turbine according to the basic parameters of the wind turbine; An energy storage parameter acquisition unit, which is used to obtain the basic parameters of each energy storage device participating in frequency modulation in the wind farm at the initial moment; the basic parameters of the energy storage device include the output of the energy storage device, the maximum charging power, and the maximum discharging power; The energy storage frequency modulation determination unit, connected to the energy storage parameter acquisition unit, is configured to determine the upward frequency modulation capacity and the downward frequency modulation capacity of any energy storage device according to the basic parameters of the energy storage device; The frequency modulation unit, respectively connected to the frequency modulation power determination unit, the wind turbine frequency modulation determination unit and the energy storage frequency modulation determination unit, is configured to determine the final frequency modulation capacity of each wind turbine and each energy storage device within the current sampling period according to the primary frequency modulation power of the wind farm, the upward frequency modulation capacity of each wind turbine, the downward frequency modulation capacity of each wind turbine, the upward frequency modulation capacity of each energy storage device and the downward frequency modulation capacity of each energy storage device, so as to perform primary frequency modulation; The iteration unit, respectively connected to the frequency modulation unit and the frequency deviation acquisition unit, is configured to determine whether the initial moment is greater than the total frequency modulation duration. If so, the primary frequency modulation ends. Otherwise, the frequency deviation value of the power system at the initial moment in the next sampling period is obtained to perform the primary frequency modulation in the next sampling period.

8. An electronic device, characterized in that, It includes a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the wind-storage primary frequency modulation power distribution method according to any one of claims 1 to 6.

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