CN116260160A - Wind-storage primary frequency modulation power distribution method and system and electronic equipment - Google Patents
Wind-storage primary frequency modulation power distribution method and system and electronic equipment Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
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Abstract
The invention provides a wind-stored primary frequency modulation power distribution method, a wind-stored primary frequency modulation power distribution system and electronic equipment, belonging to the primary frequency modulation field, wherein the wind-stored primary frequency modulation power distribution method comprises the following steps: acquiring a frequency deviation value of the power system at an initial moment in a current sampling period; if the frequency deviation value exceeds the primary frequency modulation dead zone, determining primary frequency modulation power of the wind power plant according to the frequency deviation value; according to basic parameters of each wind turbine, determining the upward frequency modulation capacity and the downward frequency modulation capacity of each corresponding wind turbine; determining the upward frequency modulation capacity and the downward frequency modulation capacity of each energy storage device according to the basic parameters of each energy storage device; and 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 power plant, the upward frequency modulation capacity and the downward frequency modulation capacity of each wind turbine and each energy storage device so as to perform primary frequency modulation, and ending the primary frequency modulation when the initial moment is greater than the total frequency modulation duration. The invention improves the frequency stability of the wind power plant when participating in primary frequency modulation of the power grid.
Description
Technical Field
The invention relates to the field of primary frequency modulation, in particular to a wind-storage primary frequency modulation power distribution method, a system and electronic equipment based on overspeed load shedding and frequency modulation capacity.
Background
The installation scale of renewable energy sources such as wind power, photovoltaic and the like is continuously increased, the permeability of wind power is improved year by year, and the intermittence, volatility and unpredictability of the output of the wind power provide challenges for the safe and stable operation of a power grid. The method is characterized in that the maintenance of the stable frequency is one of key factors for safe and stable operation of a power grid, on one hand, a standard specified by a technology of accessing a wind power plant into a power system provides a certain requirement for a rapid frequency modulation technology of the wind power plant, and the wind power plant starts to be converted from 'passive adaptation' to 'active support', so that the wind power plant needs to have a certain rapid frequency modulation capability; on the other hand, the energy storage system is used as one of key technologies for constructing a novel power system, and the excellent frequency modulation performance of the energy storage system can assist a wind power plant to improve the frequency modulation performance and improve the problems caused by renewable energy grid connection. The power grid has certain requirements on primary frequency modulation capacity of the wind power plant connected to the power system, so that primary frequency modulation power distribution method research can be developed by combining the frequency modulation capacity of the wind power generator set and the frequency modulation capacity of energy storage.
Under the background of large-scale access of wind power to a power system, the technology for realizing primary frequency modulation aiming at a wind power plant mainly comprises the following steps: (1) Active reserve is reserved through overspeed control, under the condition of overspeed load shedding control, the wind turbine generator does not operate at a maximum power point (MaximumPowerPointTracking, MPPT), but reserve is reserved through active output reduction and rotor rotation speed increase, and rotational kinetic energy is improved, wherein the load shedding rate can be obtained through calculation of current operation output and output at the maximum power point, but the method has a limited adjusting range and can influence the generated energy of the wind turbine generator; (2) Active reserve is reserved through variable pitch control, pitch angle of the blades is adjusted, attack angle of air flow on the blades is changed, and reserve is reserved, and the control strategy can realize load shedding operation at full wind speed, but has the defects of slower response speed, frequent variable pitch, easy abrasion and limited adjustment capability because the control structure is a mechanical element; (3) The method for configuring the energy storage utilizes the flexible and rapid power response characteristic of the energy storage to assist the wind turbine to participate in frequency modulation, but the current energy storage cost is still higher, the frequency modulation characteristic of the wind turbine cannot be effectively utilized, and the optimization calling of the wind turbine and the energy storage cannot be realized.
The method can be combined to participate in frequency modulation, but the existing method combining reserved standby and configured energy storage has the problems of complex solving process, large solving calculation, large prediction deviation, multiple constraint conditions and the like, and cannot rapidly and simply obtain the power of the wind turbine generator and the energy storage equipment when the wind turbine generator participates in frequency modulation according to the primary frequency modulation requirement of a power grid.
Disclosure of Invention
The invention aims to provide a wind storage primary frequency modulation power distribution method, a wind storage primary frequency modulation power distribution system and electronic equipment, which can improve the frequency stability of a wind farm when participating in primary frequency modulation of a power grid.
In order to achieve the above object, the present invention provides the following solutions:
a wind-stored primary frequency modulation power distribution method comprises the following steps:
aiming at an initial time in a current sampling period, acquiring a frequency deviation value of a power system at the initial time;
judging whether the frequency deviation value exceeds a primary frequency modulation dead zone, if the frequency deviation value does not exceed the primary frequency modulation dead zone, acquiring the frequency deviation value at the initial moment in the next sampling period, and if the frequency deviation value exceeds the primary frequency modulation dead zone, determining the primary frequency modulation power of the wind power plant according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind power plant and the difference adjustment coefficient;
acquiring basic parameters of each wind turbine generator set in the wind power plant at the initial moment; the basic parameters of the wind turbine comprise initial output of the wind turbine, maximum operation output of the wind turbine when running at a maximum power point and minimum operation output of the wind turbine under a maximum load shedding rate;
aiming at any wind turbine, determining the up-frequency modulation capacity and the down-frequency modulation capacity of the wind turbine according to the basic parameters of the wind turbine;
acquiring basic parameters of energy storage devices participating in frequency modulation in a wind farm at the initial moment; the basic parameters of the energy storage device comprise the output force, the maximum charging power and the maximum discharging power of the energy storage device;
determining the up-frequency modulation capacity and the down-frequency modulation capacity of any energy storage device according to basic parameters of the energy storage device;
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 power plant, 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;
and judging whether the initial time is greater than the total frequency modulation time, if so, ending primary frequency modulation, otherwise, acquiring the frequency deviation value of the power system at the initial time in the next sampling period, and performing primary frequency modulation of the next sampling period.
Optionally, the primary frequency modulation power of the wind farm is calculated using the following formula:
wherein P is f Is primary frequency modulation power of the wind power plant, delta f is a frequency deviation value, R is a difference adjustment coefficient, and f N For the rated frequency of the power system, P w The power rating of the wind power plant is the absolute value.
Optionally, acquiring basic parameters of each wind turbine generator set in the wind power plant at the initial moment specifically includes:
obtaining the maximum load shedding rate of each wind turbine, the maximum operation output of each wind turbine when operating at a maximum power point, the wind speed of each wind turbine at the initial moment and the initial operation load shedding rate under the corresponding wind speed;
aiming at any wind turbine, calculating the initial output of the wind turbine according to the initial operation load shedding rate of the wind turbine and the maximum operation output when the wind turbine operates at the maximum power point;
and calculating the minimum operation output of the wind turbine under the maximum load shedding rate according to the maximum load shedding rate of the wind turbine and the maximum operation output of the wind turbine when the wind turbine operates at the maximum power point.
Alternatively, equation P is employed wind_i ＝(1-d o_i )×P opt_i Calculating the initial output of the ith wind turbine generator; wherein P is wind_i Initial output for ith wind turbine generator systemForce d o_i Load shedding rate, P, for initial operation of ith wind turbine generator system opt_i The maximum operation output is the maximum operation output when the ith wind turbine generator system operates at the maximum power point;
using formula P min_i ＝(1-d max_i )×P opt_i Calculating the minimum operation output of the ith wind turbine generator under the maximum load shedding rate; wherein P is min_i D, the minimum operation output of the ith wind turbine generator under the maximum load shedding rate is d max_i And the maximum load shedding rate of the ith wind turbine generator system is set.
Alternatively, equation C is used wup_i ＝P opt_i -P wind_i Determining the upward frequency modulation capacity of an ith wind turbine generator; using formula C wdn_i ＝P wind_i -P min_i Determining the downward frequency modulation capacity of an ith wind turbine generator;
wherein C is wup_i C is the upward frequency modulation capacity of the ith wind turbine generator system wdn_i For the downward frequency modulation capacity of the ith wind turbine, P opt_i For the maximum operation output of the ith typhoon motor group when operating at the maximum power point, P wind_i For the initial output of the ith wind turbine generator system, P min_i And the minimum operation output of the ith wind turbine generator set under the maximum load shedding rate is obtained.
Alternatively, equation C is used sup_j ＝P smax_j -P st_j Determining an up-modulation capacity of a jth energy storage device; using formula C sdn_j ＝P st_j -P smin_j Determining a down-modulation capacity of a jth energy storage device;
wherein C is sup_j Up-regulated capacity for jth energy storage device, C sdn_j For the down-modulation capacity, P, of the jth energy storage device smax_j Maximum discharge power of jth energy storage device, P st_j For the output of the jth energy storage device, P smin_j The maximum charging power for the jth energy storage device.
Optionally, 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 up frequency modulation capacity of each wind turbine, the down frequency modulation capacity of each wind turbine, the up frequency modulation capacity of each energy storage device and the down frequency modulation capacity of each energy storage device, which specifically includes:
if the primary frequency modulation power of the wind power plant is smaller than 0, each wind turbine and each energy storage device participate in upward frequency modulation, and the final frequency modulation capacity of each wind turbine and each energy storage device is the final upward frequency modulation capacity;
determining the final upward frequency modulation capacity of each wind turbine generator set and the final upward frequency modulation capacity of each energy storage device in the current sampling period according to the first frequency modulation power of the wind power plant, the upward frequency modulation capacity of each wind turbine generator set and the upward frequency modulation capacity of each energy storage device;
if the primary frequency modulation power of the wind power plant is greater than 0, each wind turbine and each energy storage device participate in downward frequency modulation, and the final frequency modulation capacity of each wind turbine and each energy storage device is the final downward frequency modulation capacity;
and determining the final down-modulation capacity of each wind turbine generator set and the final down-modulation capacity of each energy storage device in the current sampling period according to the first frequency modulation power of the wind power plant, the down-modulation capacity of each wind turbine generator set and the down-modulation capacity of each energy storage device.
Optionally, the final up-frequency capacity of the ith wind turbine is determined using the following formula:
the final up-modulation capacity of the jth energy storage device is determined using the following equation:
wherein CC wup_i CC is the final upward frequency modulation capacity of the ith wind turbine generator system sup_j For the final up-regulated capacity of the jth energy storage device, C wup_i The up-frequency modulation capacity of the ith wind turbine generator system, P f Is primary frequency modulation power of wind power plant, N wind N is the number of wind turbines in a wind power plant st C is the number of energy storage devices in the wind power plant sup_j Is the up-regulated capacity of the jth energy storage device.
In order to achieve the above purpose, the present invention also provides the following solutions:
a wind-stored primary frequency modulated power distribution system comprising:
the frequency deviation acquisition unit is used for acquiring a frequency deviation value of the power system at the initial time in the current sampling period;
the frequency modulation dead zone judging unit is connected with the deviation obtaining unit and is used for judging whether the frequency deviation value exceeds a primary frequency modulation dead zone, and if the frequency deviation value does not exceed the primary frequency modulation dead zone, the frequency deviation value at the initial moment in the next sampling period is obtained;
the frequency modulation power determining unit is connected with the dead zone judging unit and is used for determining primary frequency modulation power of the wind power plant according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind power plant and the difference adjustment coefficient if the frequency deviation value exceeds the primary frequency modulation dead zone;
the fan parameter acquisition unit is used for acquiring basic parameters of each wind turbine generator set in the wind power plant at the initial moment; the basic parameters of the wind turbine comprise initial output of the wind turbine, maximum operation output of the wind turbine when running at a maximum power point and minimum operation output of the wind turbine under a maximum load shedding rate;
the fan frequency modulation determining unit is connected with the fan parameter obtaining unit and is used 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;
the energy storage parameter acquisition unit is used for acquiring basic parameters of each energy storage device participating in frequency modulation in the wind power plant at the initial moment; the basic parameters of the energy storage device comprise the output force, the maximum charging power and the maximum discharging power of the energy storage device;
the energy storage frequency modulation determining unit is connected with the energy storage parameter obtaining unit and is used 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;
the frequency modulation unit is respectively connected with the frequency modulation power determination unit, the fan frequency modulation determination unit and the energy storage frequency modulation determination unit and is used 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 power plant, 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;
and the iteration unit is respectively connected with the frequency modulation unit and the frequency deviation acquisition unit and is used for judging whether the initial time is longer than the total frequency modulation time, if so, ending primary frequency modulation, otherwise, acquiring the frequency deviation value of the power system at the initial time in the next sampling period, and carrying out primary frequency modulation of the next sampling period.
In order to achieve the above purpose, the present invention also provides the following solutions:
an electronic device comprises a memory and a processor, wherein the memory is used for storing 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 the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, the upward/downward frequency modulation capacity of the wind turbine and the energy storage equipment is combined, the running output of the wind turbine is dynamically adjusted based on the load shedding rate, and the efficiency of primary frequency modulation power distribution is improved on the basis of considering the frequency modulation capacity of the wind turbine and the energy storage equipment. The wind turbine generator sets are reserved with a certain upward frequency modulation capacity and a certain downward frequency modulation capacity in a control mode of overspeed load shedding, the primary frequency modulation capacity of the wind power plant with the energy storage equipment is improved by combining the frequency modulation capacity of each wind turbine generator set and the frequency modulation capacity of each energy storage equipment, and the wind power plant is safely and stably connected into a power grid while the problem of primary frequency modulation power distribution is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for distributing wind-stored primary frequency modulation power according to the present invention;
fig. 2 is a schematic diagram of a wind-stored primary frequency modulation power distribution system according to the present invention.
Symbol description:
the frequency deviation acquisition unit-1, the frequency modulation dead zone judgment unit-2, the frequency modulation power determination unit-3, the fan parameter acquisition unit-4, the fan frequency modulation determination unit-5, the energy storage parameter acquisition unit-6, the energy storage frequency modulation determination unit-7, the frequency modulation unit-8 and the iteration unit-9.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a wind power storage primary frequency modulation power distribution method, a system and electronic equipment, and a method for controlling overspeed load shedding and configuring energy storage based on a wind turbine generator, which are used for researching a power distribution method of wind power plants with energy storage equipment for participating in primary frequency modulation, so that the problem of stable frequency and power distribution when the wind power plants participate in primary frequency modulation of the power grid is scientifically and efficiently solved, and further, the wind power plants or mass distributed wind turbine generators are safely and stably connected into the power grid in a large scale, and the wind power storage system has the advantages of primary frequency modulation capability, active support of the power grid and autonomous operation.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, this embodiment provides a wind-storage primary frequency modulation power distribution method, which includes:
s1: and acquiring a frequency deviation value delta f of the power system at the initial time (t time, the initial value of t is 0) in the current sampling period.
S2: and judging whether the frequency deviation value exceeds a primary frequency modulation dead zone, and if the frequency deviation value does not exceed the primary frequency modulation dead zone, acquiring the frequency deviation value at the initial moment in the next sampling period.
S3: and if the frequency deviation value exceeds the primary frequency modulation dead zone, determining the primary frequency modulation power of the wind power plant according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind power plant and the difference adjustment coefficient. And if the frequency deviation value exceeds the primary frequency modulation dead zone, the wind power plant containing the energy storage equipment participates in frequency modulation.
Specifically, the primary frequency modulation power of the wind farm is calculated by adopting the following formula:
wherein P is f Is primary frequency modulation power of the wind power plant, delta f is a frequency deviation value, R is a difference adjustment coefficient, and f N For the rated frequency of the power system, P w The power rating of the wind power plant is the absolute value.
S4: and acquiring basic parameters of each wind turbine generator set in the wind power plant at the initial moment.
In this embodiment, the basic parameters of the wind turbine include an initial output of the wind turbine, a maximum operating output of the wind turbine when operating at a maximum power point, and a minimum operating output of the wind turbine at a maximum load shedding rate.
Further, step S4 includes:
s41: obtaining the maximum load shedding rate of each wind turbine generator and the operation of each wind turbine generatorMaximum operation output at the maximum power point and wind speed v of each wind turbine generator set at the initial moment i And the initial operation load shedding rate at the corresponding wind speed. The embodiment assumes that the wind speed of the wind turbine generator set remains unchanged in each sampling period.
S42: and aiming at any wind turbine, calculating the initial output of the wind turbine according to the initial operation load shedding rate of the wind turbine and the maximum operation output when the wind turbine operates at the maximum power point. Specifically, equation P is employed wind_i ＝(1-d o_i )×P opt_i And calculating the initial output of the ith wind turbine generator. Wherein P is wind_i Initial output of the ith wind turbine generator system, d o_i For the initial operation load shedding rate of the ith wind turbine generator system, the variable load shedding rate curve of the fixed load shedding rate or the reference part of the document units can be adopted for determining, and d is more than or equal to 0 o_i ≤d max_i ，P opt_i And the maximum operation output is the maximum operation output when the ith wind turbine generator system operates at the maximum power point.
S43: and calculating the minimum operation output of the wind turbine under the maximum load shedding rate according to the maximum load shedding rate of the wind turbine and the maximum operation output of the wind turbine when the wind turbine operates at the maximum power point.
Specifically, equation P is employed min_i ＝(1-d max_i )×P opt_i And calculating the minimum operation output of the ith wind turbine generator under the maximum load shedding rate. Wherein P is min_i For the ith wind turbine generator set at the maximum load shedding rate d max_i Minimum operating force, d max_i The maximum load shedding rate (d is more than or equal to 0) of the ith wind turbine generator system max_i ≤1)。
S5: and aiming at any wind turbine, determining the up-frequency modulation capacity and the down-frequency modulation capacity of the wind turbine according to the basic parameters of the wind turbine.
Specifically, equation C is employed wup_i ＝P opt_i -P wind_i And determining the up-frequency modulation capacity of the ith wind turbine generator system. Using formula C wdn_i ＝P wind_i -P min_i And determining the downward frequency modulation capacity of the ith wind turbine.
Wherein,,C wup_i c is the upward frequency modulation capacity of the ith wind turbine generator system wdn_i For the downward frequency modulation capacity of the ith wind turbine, P opt_i For the maximum operation output of the ith typhoon motor group when operating at the maximum power point, P wind_i For the initial output of the ith wind turbine generator system, P min_i And the minimum operation output of the ith wind turbine generator set under the maximum load shedding rate is obtained.
S6: and acquiring basic parameters of all energy storage devices participating in frequency modulation in the wind farm at the initial moment. Basic parameters of the energy storage device include the output force, maximum charge power, maximum discharge power, rated power, and state of charge of the energy storage device.
S7: and determining the up-frequency modulation capacity and the down-frequency modulation capacity of the energy storage equipment according to the basic parameters of the energy storage equipment aiming at any energy storage equipment.
Specifically, equation C is employed sup_j ＝P smax_j -P st_j The up-modulation capacity of the jth energy storage device is determined. Using formula C sdn_j ＝P st_j -P smin_j The down-modulation capacity of the jth energy storage device is determined.
Wherein C is sup_j Up-regulated capacity for jth energy storage device, C sdn_j For the down-modulation capacity, P, of the jth energy storage device smax_j Maximum discharge power of jth energy storage device, P st_j For the output of the jth energy storage device, P smin_j The maximum charging power for the jth energy storage device.
The up/down modulation capacity of the wind turbine/energy storage device represents the capacity that the wind turbine/energy storage device can up/down modulate during the current sampling period.
S8: and 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 power plant, 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 final frequency modulation capacity of each wind turbine and each energy storage device represents the frequency modulation capacity required to be provided by each wind turbine and each energy storage device, namely the power distribution result of each wind turbine and each energy storage device.
Further, when the primary frequency modulation power is smaller than 0, the wind power plant with the energy storage device needs to participate in upward frequency modulation, and when the primary frequency modulation power is larger than 0, the wind power plant with the energy storage device needs to participate in downward frequency modulation. The step S8 specifically comprises the following steps:
s81: and if the primary frequency modulation power of the wind power plant is smaller than 0, the wind power sets and the energy storage devices participate in upward frequency modulation, and the final frequency modulation capacity of the wind power sets and the energy storage devices is the final upward frequency modulation capacity.
S82: and determining the final upward frequency modulation capacity of each wind turbine generator set and the final upward frequency modulation capacity of each energy storage device in the current sampling period according to the first frequency modulation power of the wind power plant, the upward frequency modulation capacity of each wind turbine generator set and the upward frequency modulation capacity of each energy storage device.
In this embodiment, the following formula is used to determine the final up-frequency capacity of the ith wind turbine generator system:
the final up-modulation capacity of the jth energy storage device is determined using the following equation:
wherein CC wup_i CC is the final upward frequency modulation capacity of the ith wind turbine generator system sup_j For the final up-regulated capacity of the jth energy storage device, C wup_i The up-frequency modulation capacity of the ith wind turbine generator system, P f Is primary frequency modulation power of wind power plant, N wind N is the number of wind turbines in a wind power plant st C is the number of energy storage devices in the wind power plant sup_j I=1, 2, …, N for the up-modulation capacity of the jth energy storage device wind ，j＝1,2,…,N st 。
S83: and if the primary frequency modulation power of the wind power plant is greater than 0, the wind power sets and the energy storage devices participate in downward frequency modulation, and the final frequency modulation capacity of the wind power sets and the energy storage devices is the final downward frequency modulation capacity.
S84: and determining the final down-modulation capacity of each wind turbine generator set and the final down-modulation capacity of each energy storage device in the current sampling period according to the first frequency modulation power of the wind power plant, the down-modulation capacity of each wind turbine generator set and the down-modulation capacity of each energy storage device.
In this embodiment, the following formula is used to determine the final down-frequency capacity of the ith wind turbine generator system:
the final down-modulation capacity of the jth energy storage device is determined using the following equation:
wherein CC wdn_i CC is the final down-frequency modulation capacity of the ith wind turbine generator system sdn_j The final down-regulated capacity of the jth energy storage device.
S9: and judging whether the initial time is greater than the total frequency modulation time, if so, ending primary frequency modulation, otherwise, acquiring the frequency deviation value of the power system at the initial time in the next sampling period, and performing primary frequency modulation of the next sampling period. Specifically, if T is smaller than the total duration T of the frequency modulation z Then, the next sampling period is carried out, t=t+t, T is the time length of one sampling period, and the steps S1 to S9 are repeated; if T is greater than or equal to the total frequency modulation time length T z And ending the wind-stored primary frequency modulation power distribution calculation process.
Compared with the prior art, the invention can realize the following technical effects:
1. aiming at the problems of limited adjusting range, influence on generating capacity of a wind turbine and slower response speed of a method for only reserving active reserve, the invention can better improve the capacity and flexibility of the wind power plant for participating in frequency modulation by combining the frequency modulation capacity of energy storage equipment, and improves the response speed by increasing the adjustable range and reducing the influence on the generating capacity of the wind turbine by utilizing the frequency modulation capacity of energy storage and utilizing the characteristic of quick response of the energy storage.
2. Aiming at the problems that the cost is high and the frequency modulation capacity of the wind turbine can not be effectively utilized only by adopting a method for configuring energy storage, the invention can better utilize the active standby capacity of the wind turbine by combining the frequency modulation capacity of the wind turbine, and realize the optimization calling when the wind turbine and the energy storage participate in primary frequency modulation.
3. Aiming at the problems of complex solving process, large solving calculated amount, large prediction deviation and the like existing at present in a method for combining reserved active standby with energy storage, the invention combines the upward/downward frequency modulation capacity of a wind turbine and energy storage equipment, dynamically adjusts the running output of the wind turbine based on the initial load shedding rate, and realizes the quick and simple calculation of a primary frequency modulation distribution method on the basis of considering the frequency modulation capacity of the wind turbine and the energy storage.
Example two
In order to execute the corresponding method of the above embodiment to achieve the corresponding functions and technical effects, a wind-storage primary frequency modulation power distribution system is provided below.
As shown in fig. 2, the wind-storage primary frequency modulation power distribution system provided in this embodiment includes: frequency deviation obtaining unit 1, frequency modulation dead zone judging unit 2, frequency modulation power determining unit 3, fan parameter obtaining unit 4, fan frequency modulation determining unit 5, energy storage parameter obtaining unit 6, energy storage frequency modulation determining unit 7, frequency modulation unit 8 and iteration unit 9.
The frequency deviation obtaining unit 1 is configured to obtain, for an initial time in a current sampling period, a frequency deviation value of a power system at the initial time.
The frequency modulation dead zone judging unit 2 is connected with the frequency deviation obtaining unit 1, and the frequency modulation dead zone judging unit 2 is used for judging whether the frequency deviation value exceeds a primary frequency modulation dead zone, and if the frequency deviation value does not exceed the primary frequency modulation dead zone, the frequency deviation value at the initial moment in the next sampling period is obtained.
The frequency modulation power determining unit 3 is connected with the frequency modulation dead zone judging unit 2, and the frequency modulation power determining unit 3 is used for determining primary frequency modulation power of the wind power plant according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind power plant and the difference adjustment coefficient if the frequency deviation value exceeds the primary frequency modulation dead zone.
The fan parameter obtaining unit 4 is used for obtaining basic parameters of each wind turbine in the wind power plant at the initial moment. The basic parameters of the wind turbine include initial output of the wind turbine, maximum operation output of the wind turbine when operating at a maximum power point, and minimum operation output of the wind turbine at a maximum load shedding rate.
The fan frequency modulation determining unit 5 is connected with the fan parameter obtaining unit 4, and the fan frequency modulation determining unit 5 is used for determining the up-frequency modulation capacity and the down-frequency modulation capacity of any wind turbine according to the basic parameters of the wind turbine.
The energy storage parameter obtaining unit 6 is used for obtaining 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 force, the maximum charging power and the maximum discharging power of the energy storage device.
The energy storage frequency modulation determining unit 7 is connected with the energy storage parameter obtaining unit 6, and the energy storage frequency modulation determining unit 7 is used for determining the up-frequency modulation capacity and the down-frequency modulation capacity of any energy storage device according to the basic parameters of the energy storage device.
The frequency modulation unit 8 is respectively connected with the frequency modulation power determination unit 3, the fan frequency modulation determination unit 5 and the energy storage frequency modulation determination unit 7, and the frequency modulation unit 8 is used for determining final frequency modulation capacities of the wind turbines and the energy storage devices in the current sampling period according to primary frequency modulation power of the wind turbine, upward frequency modulation capacities of the wind turbines, downward frequency modulation capacities of the wind turbines, upward frequency modulation capacities of the energy storage devices and downward frequency modulation capacities of the energy storage devices so as to perform primary frequency modulation.
The iteration unit 9 is respectively connected with the frequency modulation unit 8 and the frequency deviation obtaining unit 1, and the iteration unit 9 is used for judging whether the initial time is greater than the total frequency modulation time, if yes, ending primary frequency modulation, otherwise, obtaining the frequency deviation value of the power system at the initial time in the next sampling period, and performing primary frequency modulation of the next sampling period.
Compared with the prior art, the wind-storage primary frequency modulation power distribution system provided by the embodiment has the same beneficial effects as the wind-storage primary frequency modulation power distribution method provided by the embodiment, and is not repeated here.
Example III
The embodiment provides an electronic device, including a memory and a processor, where the memory is configured 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 allocation method of the first embodiment.
Alternatively, the electronic device may be a server.
In addition, the embodiment of the invention also provides a computer readable storage medium, which stores a computer program, and the computer program realizes the wind-storage primary frequency modulation power distribution method of the first embodiment when being executed by a processor.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The wind-storage primary frequency modulation power distribution method is characterized by comprising the following steps of:
aiming at an initial time in a current sampling period, acquiring a frequency deviation value of a power system at the initial time;
judging whether the frequency deviation value exceeds a primary frequency modulation dead zone, if the frequency deviation value does not exceed the primary frequency modulation dead zone, acquiring the frequency deviation value at the initial moment in the next sampling period, and if the frequency deviation value exceeds the primary frequency modulation dead zone, determining the primary frequency modulation power of the wind power plant according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind power plant and the difference adjustment coefficient;
acquiring basic parameters of each wind turbine generator set in the wind power plant at the initial moment; the basic parameters of the wind turbine comprise initial output of the wind turbine, maximum operation output of the wind turbine when running at a maximum power point and minimum operation output of the wind turbine under a maximum load shedding rate;
aiming at any wind turbine, determining the up-frequency modulation capacity and the down-frequency modulation capacity of the wind turbine according to the basic parameters of the wind turbine;
acquiring basic parameters of energy storage devices participating in frequency modulation in a wind farm at the initial moment; the basic parameters of the energy storage device comprise the output force, the maximum charging power and the maximum discharging power of the energy storage device;
determining the up-frequency modulation capacity and the down-frequency modulation capacity of any energy storage device according to basic parameters of the energy storage device;
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 power plant, 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;
and judging whether the initial time is greater than the total frequency modulation time, if so, ending primary frequency modulation, otherwise, acquiring the frequency deviation value of the power system at the initial time in the next sampling period, and performing primary frequency modulation of the next sampling period.
2. The wind-stored primary frequency modulation power distribution method according to claim 1, wherein the primary frequency modulation power of the wind farm is calculated using the following formula:
wherein P is f Is primary frequency modulation power of the wind power plant, delta f is a frequency deviation value, R is a difference adjustment coefficient, and f N For the rated frequency of the power system, P w The power rating of the wind power plant is the absolute value.
3. The wind power storage primary frequency modulation power distribution method according to claim 1, wherein the obtaining of the basic parameters of each wind turbine in the wind farm at the initial moment specifically comprises:
obtaining the maximum load shedding rate of each wind turbine, the maximum operation output of each wind turbine when operating at a maximum power point, the wind speed of each wind turbine at the initial moment and the initial operation load shedding rate under the corresponding wind speed;
aiming at any wind turbine, calculating the initial output of the wind turbine according to the initial operation load shedding rate of the wind turbine and the maximum operation output when the wind turbine operates at the maximum power point;
and calculating the minimum operation output of the wind turbine under the maximum load shedding rate according to the maximum load shedding rate of the wind turbine and the maximum operation output of the wind turbine when the wind turbine operates at the maximum power point.
4. A wind-stored primary frequency modulation power distribution method according to claim 3, wherein formula P is adopted wind_i ＝(1-d o_i )×P opt_i Calculating the initial output of the ith wind turbine generator; wherein P is wind_i Initial output of the ith wind turbine generator system, d o_i Load shedding rate, P, for initial operation of ith wind turbine generator system opt_i The maximum operation output is the maximum operation output when the ith wind turbine generator system operates at the maximum power point;
using formula P min_i ＝(1-d max_i )×P opt_i Computing ith typhoon motorMinimum operating output of the group at maximum load shedding rate; wherein P is min_i D, the minimum operation output of the ith wind turbine generator under the maximum load shedding rate is d max_i And the maximum load shedding rate of the ith wind turbine generator system is set.
5. The wind-stored primary frequency modulation power distribution method according to claim 1, wherein formula C is adopted wup_i ＝P opt_i -P wind_i Determining the upward frequency modulation capacity of an ith wind turbine generator; using formula C wdn_i ＝P wind_i -P min_i Determining the downward frequency modulation capacity of an ith wind turbine generator;
wherein C is wup_i C is the upward frequency modulation capacity of the ith wind turbine generator system wdn_i For the downward frequency modulation capacity of the ith wind turbine, P opt_i For the maximum operation output of the ith typhoon motor group when operating at the maximum power point, P wind_i For the initial output of the ith wind turbine generator system, P min_i And the minimum operation output of the ith wind turbine generator set under the maximum load shedding rate is obtained.
6. The wind-stored primary frequency modulation power distribution method according to claim 1, wherein formula C is adopted sup_j ＝P smax_j -P st_j Determining an up-modulation capacity of a jth energy storage device; using formula C sdn_j ＝P st_j -P smin_j Determining a down-modulation capacity of a jth energy storage device;
wherein C is sup_j Up-regulated capacity for jth energy storage device, C sdn_j For the down-modulation capacity, P, of the jth energy storage device smax_j Maximum discharge power of jth energy storage device, P st_j For the output of the jth energy storage device, P smin_j The maximum charging power for the jth energy storage device.
7. The wind power storage primary frequency modulation power distribution method according to claim 1, wherein 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 power plant, the up frequency modulation capacity of each wind turbine, the down frequency modulation capacity of each wind turbine, the up frequency modulation capacity of each energy storage device, and the down frequency modulation capacity of each energy storage device specifically comprises:
if the primary frequency modulation power of the wind power plant is smaller than 0, each wind turbine and each energy storage device participate in upward frequency modulation, and the final frequency modulation capacity of each wind turbine and each energy storage device is the final upward frequency modulation capacity;
determining the final upward frequency modulation capacity of each wind turbine generator set and the final upward frequency modulation capacity of each energy storage device in the current sampling period according to the first frequency modulation power of the wind power plant, the upward frequency modulation capacity of each wind turbine generator set and the upward frequency modulation capacity of each energy storage device;
if the primary frequency modulation power of the wind power plant is greater than 0, each wind turbine and each energy storage device participate in downward frequency modulation, and the final frequency modulation capacity of each wind turbine and each energy storage device is the final downward frequency modulation capacity;
and determining the final down-modulation capacity of each wind turbine generator set and the final down-modulation capacity of each energy storage device in the current sampling period according to the first frequency modulation power of the wind power plant, the down-modulation capacity of each wind turbine generator set and the down-modulation capacity of each energy storage device.
8. The wind power storage primary frequency modulation power distribution method according to claim 7, wherein the final up-modulation capacity of the ith wind turbine is determined by adopting the following formula:
the final up-modulation capacity of the jth energy storage device is determined using the following equation:
wherein CC wup_i Final up-regulation for the ith wind turbineFrequency capacity, CC sup_j For the final up-regulated capacity of the jth energy storage device, C wup_i The up-frequency modulation capacity of the ith wind turbine generator system, P f Is primary frequency modulation power of wind power plant, N wind N is the number of wind turbines in a wind power plant st C is the number of energy storage devices in the wind power plant sup_j Is the up-regulated capacity of the jth energy storage device.
9. A wind-stored primary frequency modulated power distribution system, the wind-stored primary frequency modulated power distribution system comprising:
the frequency deviation acquisition unit is used for acquiring a frequency deviation value of the power system at the initial time in the current sampling period;
the frequency modulation dead zone judging unit is connected with the deviation obtaining unit and is used for judging whether the frequency deviation value exceeds a primary frequency modulation dead zone, and if the frequency deviation value does not exceed the primary frequency modulation dead zone, the frequency deviation value at the initial moment in the next sampling period is obtained;
the frequency modulation power determining unit is connected with the dead zone judging unit and is used for determining primary frequency modulation power of the wind power plant according to the frequency deviation value, the rated frequency of the power system, the rated power of the wind power plant and the difference adjustment coefficient if the frequency deviation value exceeds the primary frequency modulation dead zone;
the fan parameter acquisition unit is used for acquiring basic parameters of each wind turbine generator set in the wind power plant at the initial moment; the basic parameters of the wind turbine comprise initial output of the wind turbine, maximum operation output of the wind turbine when running at a maximum power point and minimum operation output of the wind turbine under a maximum load shedding rate;
the fan frequency modulation determining unit is connected with the fan parameter obtaining unit and is used 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;
the energy storage parameter acquisition unit is used for acquiring basic parameters of each energy storage device participating in frequency modulation in the wind power plant at the initial moment; the basic parameters of the energy storage device comprise the output force, the maximum charging power and the maximum discharging power of the energy storage device;
the energy storage frequency modulation determining unit is connected with the energy storage parameter obtaining unit and is used 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;
the frequency modulation unit is respectively connected with the frequency modulation power determination unit, the fan frequency modulation determination unit and the energy storage frequency modulation determination unit and is used 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 power plant, 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;
and the iteration unit is respectively connected with the frequency modulation unit and the frequency deviation acquisition unit and is used for judging whether the initial time is longer than the total frequency modulation time, if so, ending primary frequency modulation, otherwise, acquiring the frequency deviation value of the power system at the initial time in the next sampling period, and carrying out primary frequency modulation of the next sampling period.
10. An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the wind-stored-primary-frequency-modulated power distribution method of any one of claims 1 to 8.
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| CN117277356B (en) * | 2023-11-22 | 2024-01-26 | 北京华孚聚能科技有限公司 | Wind power plant using box transformer measurement and control primary frequency modulation response and related method |
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