CN113765141A - Wind power grid-connected down-peak regulation capability assessment method and system - Google Patents

Wind power grid-connected down-peak regulation capability assessment method and system Download PDF

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Publication number
CN113765141A
CN113765141A CN202111050091.6A CN202111050091A CN113765141A CN 113765141 A CN113765141 A CN 113765141A CN 202111050091 A CN202111050091 A CN 202111050091A CN 113765141 A CN113765141 A CN 113765141A
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peak
electric quantity
power
pumped storage
objective function
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苏翔鹰
米乡卿
张建忠
李凯强
张振江
王志强
徐飞
郝玲
罗铉众
周家旭
李翠萍
李军徽
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Inner Mongolia Hohhot Pumped Storage Power Generation Co ltd
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Inner Mongolia Hohhot Pumped Storage Power Generation Co ltd
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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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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Abstract

The invention provides a method for evaluating peak-reducing capacity under wind power integration, which comprises the following steps: acquiring a first objective function and/or a second objective function, wherein the first objective function is constructed by taking the required peak clipping electric quantity as a first index target, and the second objective function is constructed by taking the required valley filling electric quantity as a second index target; determining constraint conditions of the operating characteristics of the power system under wind power integration; and calculating the actual peak clipping electric quantity of the pumped storage power station and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function. The invention realizes quantitative analysis of the energy efficiency of the pumped storage power station in peak clipping and valley filling in the power grid system.

Description

Wind power grid-connected down-peak regulation capability assessment method and system
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a system for evaluating peak-reducing capacity during wind power integration.
Background
By the end of 2020, the installed capacity of national grid-connected wind power reaches 28153 ten thousand kilowatts, and the generated energy of national grid-connected wind power is 4665 hundred million kilowatt-hours. However, the output of wind power at night is larger than that of the daytime, the loads are opposite, peak load generally appears in the daytime, and electricity consumption at night is lower, and the characteristic of inverse peak regulation is shown, so that the peak-valley difference of the net load of the system can be increased by large-scale grid connection of the wind power. Due to the fact that the peak shaving capacity of the thermal power generating unit is limited, the large-scale grid connection of wind power enables the peak shaving capacity of a power system to be insufficient. The pumped storage power station has the characteristics of long-time storage and electric energy release as a technically mature energy storage device, can store wind power which cannot be accommodated by a power grid in a load valley period, and then releases the wind power in a load peak period to relieve peak load of a system.
The pumped storage power station has the characteristics of quick start and stop, large capacity adjustment range and flexible and changeable operation mode, and is an effective measure for solving the problem of wind power consumption. However, a quantitative analysis method for the peak clipping and valley filling effects of the pumped storage power station is lacked in the prior art.
Disclosure of Invention
The invention provides a method and a system for evaluating peak shaving capacity of a wind power grid-connected pumped storage power station, which are used for solving the defect that a quantitative evaluation method is lacked in the prior art and realizing quantitative evaluation on the peak shaving and valley filling capacity of the wind power grid-connected pumped storage power station.
In a first aspect, the invention provides a wind power grid-connected peak-reduction capability evaluation method, which comprises the following steps: acquiring a first objective function and/or a second objective function, wherein the first objective function is constructed by taking the required peak clipping electric quantity as a first index target, and the second objective function is constructed by taking the required valley filling electric quantity as a second index target; determining constraint conditions of the operating characteristics of the power system under wind power integration; and calculating the actual peak clipping electric quantity of the pumped storage power station and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
Optionally, the first objective function is:
Figure BDA0003252593290000021
the second objective function is:
Figure BDA0003252593290000022
wherein E isclipIndicating the electric quantity needing peak clipping; efillIndicating the required valley filling electric quantity; delta P'dif(τ) represents the system net load peak to valley difference; pNet(t) representing the net load power after wind power integration at the time t; pvalley(τ) represents the net load valley; t is t1、t2Representing the time starting and ending value of peak clipping; τ denotes a time parameter.
Optionally, the constraint condition includes a power system requirement and an operation constraint condition; the power system requirements and operation constraint conditions comprise power balance constraint conditions and thermal power unit output constraint conditions;
the power balance constraint conditions are as follows:
Figure BDA0003252593290000023
the output constraint conditions of the thermal power generating unit are as follows:
Ph,min≤Ph,t≤Ph,max；
wherein h is the index number of the thermal power generating unit, N is the total number of the thermal power generating units, and Ph,tRepresenting the output of the thermal power generating unit h at the time t; i is the index number of the pumped storage unit, M is the total number of the pumped storage unit,
Figure BDA0003252593290000031
representing the power generation output of the pumped storage unit i at the time t;
Figure BDA0003252593290000032
the pumping output of the pumped storage unit i at the time t is represented; j is the index number of the wind turbine generator, Q is the total number of the wind turbine generator,
Figure BDA0003252593290000033
representing the output of the wind turbine generator j at the time t; ptThe load output force at the time t is represented; ph,maxRepresenting the h maximum output of the thermal power generating unit; ph,minAnd (4) representing the minimum output of the thermal power generating unit h.
Optionally, the constraint condition further includes a pumped storage group constraint condition; the constraint conditions of the pumped storage group comprise a reservoir capacity constraint condition of the pumped storage power station, a reservoir electric quantity balance constraint condition of the pumped storage power station and a power generation and pumping power constraint condition of the pumped storage group;
the constraint conditions of the storage capacity of the pumped storage power station are as follows:
Figure BDA0003252593290000034
the reservoir electric quantity balance constraint conditions of the pumped storage power station comprise electric quantity balance constraint conditions under a pumping working condition and electric quantity balance constraint conditions under a power generation working condition;
the water pumping condition electric quantity balance constraint conditions are as follows:
Figure BDA0003252593290000035
the power generation working condition electric quantity balance constraint conditions are as follows:
Figure BDA0003252593290000036
the constraint conditions of the power generation and pumping power of the pumped storage unit are as follows:
Figure BDA0003252593290000041
wherein the content of the first and second substances,
Figure BDA0003252593290000042
is the lower limit of the electric quantity of the upper reservoir,
Figure BDA0003252593290000043
the lower limit of the electric quantity of the drainage reservoir;
Figure BDA0003252593290000044
is the upper limit of the electric quantity of the upper reservoir,
Figure BDA0003252593290000045
is the upper limit of the lower reservoir;
Figure BDA0003252593290000046
the electric quantity of the upper reservoir at the moment t,
Figure BDA0003252593290000047
the electric quantity of the reservoir at the moment t;
Figure BDA0003252593290000048
representing the electric quantity of the reservoir at the moment t +1,
Figure BDA0003252593290000049
representing the electric quantity of the water reservoir at the moment of t + 1;
Figure BDA00032525932900000410
representing the power generation output of the pumped storage unit i at the time t;
Figure BDA00032525932900000411
the pumping output of the pumped storage unit i at the time t is represented; etagRepresenting the power generation efficiency of the pumped storage unit; etapRepresenting the pumping efficiency of the pumped storage unit; lambda is the time interval of the output force of the pumped storage unit;
Figure BDA00032525932900000412
the minimum power is generated for the pumped storage group,
Figure BDA00032525932900000413
pumping water for the pumped storage unit with minimum power;
Figure BDA00032525932900000414
the maximum power of the pumped storage group is generated,
Figure BDA00032525932900000415
the maximum power for pumping the water of the pumped storage unit is achieved.
Optionally, the wind power grid-connected peak-reduction capability evaluation method further includes: acquiring the occurrence frequency of the anti-peak-shaving phenomenon, wherein the anti-peak-shaving frequency is the ratio of the number of days for the anti-peak-shaving phenomenon to the statistical period; the frequency of occurrence of the anti-peaking phenomenon is used to assess the severity of the anti-peaking phenomenon.
Optionally, the wind power grid-connected peak-reduction capability evaluation method further includes: acquiring peak-to-valley difference variation, wherein the peak-to-valley difference variation is a variation value of a net load peak-to-valley difference after wind power integration; the peak-to-valley difference variation is used to assess the severity of the back-peaking phenomenon.
In a second aspect, the present invention further provides a wind power grid-connected peak-reduction capability evaluation system, including: the device comprises an objective function establishing module, a constraint condition determining module and an actual electric quantity calculating module. The target function establishing module is used for acquiring a first target function and/or a second target function, wherein the first target function is established by taking the peak clipping required electric quantity as a first index target, and the second target function is established by taking the valley filling required electric quantity as a second index target; the constraint condition determining module is used for determining constraint conditions of the operating characteristics of the power system under the wind power integration; and the actual electric quantity calculating module is used for calculating the actual peak clipping electric quantity of the pumped storage power station and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
In a third aspect, the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of any one of the above methods for estimating peak reduction capability during wind power integration when executing the program.
In a fourth aspect, the present invention further provides a non-transitory computer readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the wind power grid-down peak-load capability assessment method according to any one of the above.
In a fifth aspect, the present invention further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method implements the steps of any one of the wind power grid-connection peak-reduction capability assessment methods described above.
According to the method and the system for evaluating the peak shaving capacity of the wind power grid-connected power system, the first objective function and/or the second objective function are/is corrected through the constraint condition of the operating characteristic of the power system under the wind power grid-connected power system, the peak shaving and valley filling electric quantity actually exerted by the pumped storage power station in the power grid is obtained, and the energy efficiency of the pumped storage power station exerting the peak shaving and valley filling functions in the power grid system is quantitatively analyzed.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a wind power grid-connected peak-reduction capability evaluation method provided by an embodiment of the invention;
FIG. 2 is a diagram of a net load peak clipping and valley filling mechanism provided by an embodiment of the present invention;
fig. 3 is a graph of the net load peak valley difference increase degree of the monte west 2020 for four seasons according to the embodiment of the present invention;
fig. 4 is a graph of the net load peak load off-peak load electric quantity required in the year 2020 of monte, provided by the embodiment of the invention;
fig. 5 is a statistical chart of peak clipping and valley filling effects of the four-season pumped storage power station in 2020 Mongolian provided by the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a wind power grid-connected peak-reduction capability evaluation system provided by the embodiment of the invention;
fig. 7 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for evaluating the peak-reducing capability of the wind power integration is described below with reference to fig. 1 to 5.
Referring to fig. 1, fig. 1 is a schematic flow diagram of a wind power grid-connected peak-reduction capability evaluation method provided by an embodiment of the invention. The embodiment of the invention provides a method for evaluating peak shaving capacity under wind power grid-connected condition, which comprises the following steps:
step 110, acquiring a first objective function and/or a second objective function, wherein the first objective function is constructed by taking the electric quantity required to be subjected to peak clipping as a first index target, and the second objective function is constructed by taking the electric quantity required to be subjected to valley filling as a second index target;
step 120, determining constraint conditions of the operating characteristics of the power system under the wind power integration;
and 130, calculating the actual peak clipping electric quantity of the pumped storage power station and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
The constraint conditions are determined according to the operation characteristics of the power system, and may include power balance constraint conditions of the power grid system, load backup constraint conditions of the power grid system, water balance constraint conditions of upper and lower reservoirs of the pumped storage power station, reservoir capacity constraint conditions, output constraint conditions of the unit, power generation/pumped flow constraint conditions of the unit, operation state constraint conditions of the unit, power generation/pumped duration constraint conditions of the unit, power characteristics constraint conditions of the water turbine, power characteristics constraint conditions of the water pump, and the like.
Pumped storage is used as one of main peak shaving means of a power grid, and plays an important role in solving the peak shaving problem caused by large-scale wind power integration. Through the coordinated operation of pumped storage and wind power, the wind energy is transferred in time to a certain extent, the uncontrollable performance of the wind power is reduced, and the utilization rate of the wind power is improved. But a method for quantitatively evaluating the peak shaving capacity of the pumped storage power station is lacked at present.
In one embodiment, the first objective function is directly applied, and the first objective function is constructed by taking the peak clipping electric quantity as a first index target, and does not need to meet specific working performance at the moment, so that parameters required by calculation of the first objective function are obtained, and the electric quantity of the power grid, which needs to be clipped, can be obtained. The parameters required for the calculation of the first objective function may be obtained by network operation and equipment detection or monitoring data, such as a network load curve; or data that is manually processed and then input by the user.
And determining constraint conditions according to the operating characteristics of the power system under the wind power grid-connected condition. Calculating the actual peak clipping electric quantity of the pumped storage power station based on the first objective function, wherein the calculation may include correcting the first objective function through a constraint condition, that is, under the constraint condition, obtaining parameters required by calculation of the first objective function, and calculating the first objective function to obtain the peak clipping electric quantity actually exerted by the pumped storage power station in the power grid. The parameters required for the calculation of the first objective function under the constraint conditions may be obtained by network operation and equipment detection or monitoring data, such as a network load curve; or data that is manually processed and then input by the user. The actual peak clipping electric quantity of the pumped storage power station can be used for evaluating the peak clipping capacity of the pumped storage power station.
Optionally, the percentage of the actual peak clipping electric quantity of the pumped storage power station to the electric quantity to be peak clipped can be calculated to obtain an actual peak clipping ratio, and the actual peak clipping ratio is used for evaluating the peak regulation capacity of the pumped storage power station.
In one embodiment, the second objective function is directly applied, and since the second objective function is constructed by taking the electric quantity to be subjected to valley filling as the second index target and does not need to meet specific working performance, the parameters required by calculation of the second objective function are obtained, and the electric quantity to be subjected to valley filling of the power grid can be obtained. The parameters required for the calculation of the second objective function may be obtained by detecting or monitoring data of the grid operation and equipment, such as a grid load curve; or data that is manually processed and then input by the user.
And determining constraint conditions according to the operating characteristics of the power system under the wind power grid-connected condition. And calculating the actual valley filling electric quantity of the pumped storage power station based on the second objective function, wherein the step of correcting the second objective function through a constraint condition can comprise the steps of obtaining parameters required by calculation of the second objective function under the constraint condition, and calculating the second objective function to obtain the actual valley filling electric quantity of the pumped storage power station in the power grid. The parameters required for the calculation of the second objective function under the constraint conditions may be obtained by network operation and equipment detection or monitoring data, such as a network load curve; or data that is manually processed and then input by the user. The actual valley filling electric quantity of the pumped storage power station can be used for evaluating the peak shaving capacity of the pumped storage power station.
Optionally, the percentage of the actual valley filling electric quantity of the pumped storage power station to the electric quantity to be filled can be calculated to obtain an actual valley filling ratio, and the actual valley filling ratio is used for evaluating the peak load regulation capacity of the pumped storage power station.
In one embodiment, parameter value information required by a first objective function and a second objective function is obtained, the first objective function is executed, and the electric quantity required to be subjected to peak clipping is calculated; and executing a second objective function, and calculating to obtain the electric quantity to be filled. Under the constraint condition determined according to the operating characteristics of the power system under the wind power integration, the actual peak clipping electric quantity of the pumped storage power station and the actual valley filling electric quantity of the pumped storage power station are obtained based on the first objective function and the second objective function.
Optionally, the percentage of the actual peak clipping electric quantity to the electric quantity to be clipped of the pumped storage power station may be calculated to obtain an actual peak clipping ratio, the percentage of the actual valley filling electric quantity to the electric quantity to be filled of the pumped storage power station is calculated to obtain an actual valley filling ratio, and the actual peak clipping ratio and the actual valley filling ratio are used for evaluating the peak shaving capacity of the pumped storage power station.
According to the method for evaluating the peak regulation capacity during wind power integration, the actual peak regulation amount of the pumped storage power station is obtained by establishing the capacity evaluation model, the peak regulation and valley filling effects of the power grid are quantitatively evaluated by using the index, and the evaluation result can be used for optimizing the power grid, so that the peak regulation capacity of pumped storage in the power grid is reasonably and efficiently used, the wind power consumption capacity is improved, and the wind power abandoned wind is reduced.
Optionally, when the wind power has a back peak-to-peak phenomenon, the peak-to-valley difference of the net load curve is increased, and the middle value of the net load peak-to-valley is used as a middle reference line, so that the fluctuation of the net load curve is generally considered to be stabilized to 70% above and below the middle reference line, so as to ensure the power supply requirement of the load.
The area between the upper datum line and the net load peak value is the electric quantity needing peak clipping, the electric quantity needing peak clipping is used as a first index target, and a first target function is constructed as follows:
Figure BDA0003252593290000091
wherein，EclipIndicating the electric quantity needing peak clipping; delta P'dif(τ) represents the system net load peak to valley difference; pNet(t) representing the net load power after wind power integration at the time t; pvalley(τ) represents the net load valley; t is t1、t2Representing the time starting and ending value of peak clipping; τ represents a time parameter, specifically a statistical time period, in days.
The area between the lower datum line and the net load valley value is the electric quantity needing to be filled, and the electric quantity needing to be filled is used as a second index target to be constructed:
the second objective function is:
Figure BDA0003252593290000092
wherein E isfillIndicating the required valley filling electric quantity; delta P'dif(τ) represents the system net load peak to valley difference; pNet(t) representing the net load power after wind power integration at the time t; pvalley(τ) represents the net load valley; t is t1、t2Representing the time starting and ending value of peak clipping; τ represents a time parameter, specifically a statistical time period, in days.
Optionally, the constraint condition includes a power system requirement and an operation constraint condition, and the power system requirement and the operation constraint condition includes a power balance constraint condition and a thermal power unit output constraint condition.
In a system composed of a thermal power plant, wind power and a pumped storage power station, constructing a power balance constraint condition according to a power balance equation as follows:
Figure BDA0003252593290000101
wherein h is the index number of the thermal power generating unit, N is the total number of the thermal power generating units, and Ph,tRepresenting the output of the thermal power generating unit h at the time t, wherein the unit is MW; i is the index number of the pumped storage unit, M is the total number of the pumped storage unit,
Figure BDA0003252593290000102
the unit of the generated output of the pumped storage unit i at the time t is MW;
Figure BDA0003252593290000103
the unit of pumping output of the pumped storage unit i at the time t is MW; j is the index number of the wind turbine generator, Q is the total number of the wind turbine generator,
Figure BDA0003252593290000104
representing the output of the wind turbine j at the moment t, and the unit is MW; ptThe magnitude of the load output at time t is expressed in MW.
The output constraint conditions of the thermal power generating unit determined according to the maximum and minimum output constraints of the thermal power generating unit are as follows:
Ph,min≤Ph,t≤Ph,max；
wherein h is the index number of the thermal power generating unit; ph,maxRepresenting the h maximum output of the thermal power generating unit; ph,minRepresenting the h minimum output of the thermal power generating unit; ph,tAnd the unit of the output of the thermal power generating unit h at the time t is MW.
In the embodiment of the invention, the first objective function and the second objective function are corrected through the power balance constraint condition and the thermal power generating unit output constraint condition, and under the constraint, the safe and stable operation and reliable continuous power supply of a power grid can be ensured, so that the accurate actual peak clipping electric quantity of the pumped storage power station and the actual valley filling electric quantity of the pumped storage power station are obtained.
Optionally, the constraint condition further includes a pumped storage group constraint condition; the constraint conditions of the pumped storage group comprise a reservoir capacity constraint condition of the pumped storage power station, a reservoir electric quantity balance constraint condition of the pumped storage power station and a power generation and pumping power constraint condition of the pumped storage group.
In the pumped storage power station, the storage capacity of the upper reservoir and the lower reservoir is ensured to be between the minimum and maximum value ranges at any time, so the storage capacity constraint conditions of the pumped storage power station are as follows:
Figure BDA0003252593290000111
wherein the content of the first and second substances,
Figure BDA0003252593290000112
the lower limit of the electric quantity of the upper reservoir is the unit MW & h;
Figure BDA0003252593290000113
the electric quantity of the upper reservoir at the time t is in the unit of MW & h;
Figure BDA0003252593290000114
the upper limit of the electric quantity of the upper reservoir is MW & h;
Figure BDA0003252593290000115
the lower limit of the electric quantity of the drainage reservoir is represented by MW & h;
Figure BDA0003252593290000116
the unit is MW & h, and the electric quantity of the reservoir at the time t is the unit;
Figure BDA0003252593290000117
the unit is the upper limit of the lower reservoir and is MW & h.
The reservoir electric quantity balance constraint conditions of the pumped storage power station comprise pumping working condition electric quantity balance constraint conditions and power generation working condition electric quantity balance constraint conditions.
Under the operating mode of drawing water, the reservoir electric quantity in two adjacent periods need the operating mode electric quantity balance constraint condition that satisfies be:
Figure BDA0003252593290000118
wherein the content of the first and second substances,
Figure BDA0003252593290000119
the electric quantity of the upper reservoir at the time t is in the unit of MW & h;
Figure BDA00032525932900001110
is time tThe electric quantity of the reservoir of the lower reservoir is MW & h;
Figure BDA00032525932900001111
the unit of the electric quantity of the reservoir at the time of t +1 is MW & h;
Figure BDA00032525932900001112
the unit of the electric quantity of the water reservoir at the moment of t +1 is MW & h;
Figure BDA00032525932900001113
the unit of pumping output of the pumped storage unit i at the time t is MW; etapRepresenting the pumping efficiency of the pumped storage unit; and lambda is the time interval of the output force of the pumped storage unit.
In one embodiment, λ is 0.25 after a 15min interval, for example, to convert to hours.
Under the power generation working condition, the power generation working condition power balance constraint condition that the reservoir power in two adjacent time intervals needs to meet is as follows:
Figure BDA0003252593290000121
wherein the content of the first and second substances,
Figure BDA0003252593290000122
the electric quantity of the upper reservoir at the time t is in the unit of MW & h;
Figure BDA0003252593290000123
the unit is MW & h, and the electric quantity of the reservoir at the time t is the unit;
Figure BDA0003252593290000124
the unit of the electric quantity of the reservoir at the time of t +1 is MW & h;
Figure BDA0003252593290000125
the unit of the electric quantity of the water reservoir at the moment of t +1 is MW & h;
Figure BDA0003252593290000126
the unit of the generated output of the pumped storage unit i at the time t is MW; etagRepresenting the power generation efficiency of the pumped storage unit; and lambda is the time interval of the output force of the pumped storage unit.
In one embodiment, λ is 0.25 after a 15min interval, for example, to convert to hours.
Each pumped storage unit has the limit of installed capacity, so that the power generation and pumped storage power cannot exceed the maximum power, and therefore the constraint conditions of the power generation and pumped storage power of the pumped storage unit are as follows:
Figure BDA0003252593290000127
wherein the content of the first and second substances,
Figure BDA0003252593290000128
the unit is MW for the minimum power generated by the pumped storage unit,
Figure BDA0003252593290000129
the unit is MW, and the pumping minimum power is the pumping minimum power of the pumped storage unit;
Figure BDA00032525932900001210
the unit is MW for the maximum power generated by the pumped storage unit;
Figure BDA00032525932900001211
the unit is MW for the maximum pumping power of the pumped storage unit;
Figure BDA00032525932900001212
the unit of the generated output of the pumped storage unit i at the time t is MW;
Figure BDA00032525932900001213
and the unit is MW, which represents the pumping output of the pumped storage unit i at the time t.
In the embodiment of the invention, the first objective function and the second objective function are corrected through the reservoir capacity constraint condition of the pumped storage power station, the reservoir electric quantity balance constraint condition of the pumped storage power station and the power generation and pumping power constraint condition of the pumped storage unit, under the constraint, the output of the pumped storage power station can be ensured within a reasonable range, and the peak clipping power and the valley filling power of the power station do not exceed the installed capacity of the power station, so that the accurate actual peak clipping electric quantity and the actual valley filling electric quantity of the pumped storage power station are obtained.
Optionally, the method for evaluating peak-reducing capability under grid-connected wind power provided by this embodiment further includes:
acquiring the occurrence frequency of the anti-peak-shaving phenomenon, wherein the anti-peak-shaving frequency is the ratio of the number of days for the anti-peak-shaving phenomenon to the statistical period;
the frequency of occurrence of the anti-peaking phenomenon is used to assess the severity of the anti-peaking phenomenon.
In one embodiment, wind power is analyzed by taking days as a time scale, if the net load peak-valley difference of a system after wind power integration in one day is larger than the load peak-valley difference of the system before wind power integration, the wind power in the day has a back-peak-regulation characteristic, and a formula is expressed as follows:
Figure BDA0003252593290000131
in the formula (1), Δ PdifRepresenting the load peak-valley difference of the system, and the unit is MW; delta P'difRepresenting the system net load peak-valley difference in MW; ppeakRepresenting the peak power of the system load, and the unit is MW; pvalleyRepresents the system load valley power, with the unit of MW; p'peakRepresenting the system net load peak power in MW; p'valleyRepresenting the system payload valley power in MW. Delta P'dif-ΔPdifThe wind power of the day is indicated to have a back peak regulation characteristic by being greater than 0.
Specifically, the frequency of the wind power anti-peak-shaving phenomenon is calculated according to the following formula:
Figure BDA0003252593290000132
Figure BDA0003252593290000141
the formula (2) is a defined function, and the function is that when the function variable is a positive number, the function value returns to 1, and when the function variable is a negative number or 0, the function value returns to 0; in the formula (3), FrequencyRWRepresenting the frequency of the reverse peak regulation phenomenon of the wind power; delta P'dif(τ) represents the system net load peak-to-valley difference in MW; delta Pdif(τ) represents the system load peak-to-valley difference in MW; τ represents the statistical time period in days.
The occurrence frequency of the anti-peak-shaving phenomenon is used for evaluating the influence of the current large-scale wind power grid connection on a power grid system, the higher the occurrence frequency of the anti-peak-shaving phenomenon is, the more serious the anti-peak-shaving phenomenon is, and otherwise, the lower the occurrence frequency of the anti-peak-shaving phenomenon is, the more slight the anti-peak-shaving phenomenon is.
According to the embodiment of the invention, the severity of the reverse peak regulation phenomenon is judged through the occurrence frequency of the reverse peak regulation phenomenon, and the evaluation result can be used for carrying out optimization decision on the power grid through quantitative evaluation on the reverse peak regulation phenomenon, so that the peak regulation capacity of water pumping and energy storage in the power grid is reasonably and efficiently utilized, the wind power consumption capability is improved, and the wind power abandoned wind is reduced.
Optionally, the method for evaluating peak-reducing capability under grid-connected wind power provided by this embodiment further includes:
acquiring peak-valley difference variable quantity, wherein the peak-valley difference variable quantity is a change value of a net load peak-valley difference after wind power integration;
the peak-to-valley difference variation is used to assess the severity of the back-peaking phenomenon.
Specifically, the peak-to-valley difference variation is a variation value of a net load peak-to-valley difference after wind power integration.
The peak-to-valley difference change amount is calculated by the following formula:
Figure BDA0003252593290000142
in the formula,. DELTA.Pd(tau) represents the change value of the net load peak-valley difference after wind power integration, MW, delta PdifRepresents the system load peak-to-valley difference, MW; delta P'difRepresents the system net load peak-to-valley difference, MW; ppeakRepresents the system load peak power, MW; pvalleyRepresents the system load valley power, MW; p'peakRepresents the system net load peak power, MW; p'valleyRepresenting the system payload valley power, MW.
The peak-valley difference variable quantity is used for evaluating the influence of the current large-scale wind power grid connection on a power grid system, the larger the peak-valley difference variable quantity is, the more serious the back peak regulation phenomenon is, and otherwise, the smaller the peak-valley difference variable quantity is, the more slight the back peak regulation phenomenon is.
According to the embodiment of the invention, the severity of the anti-peak-shaving phenomenon is judged through the peak-valley difference variation, and the anti-peak-shaving phenomenon is quantitatively evaluated, so that the evaluation result can be used for carrying out optimization decision on the power grid, the peak-shaving capacity of pumping water and storing energy in the power grid is reasonably and efficiently utilized, the wind power consumption capability is improved, and the wind power abandoned wind is reduced.
It is to be added that, in order to verify the effectiveness of the wind power grid-connected down-peak regulation capability evaluation method provided by the invention, the following example system is adopted: the method comprises the steps of Monte 2020, whole-grid wind power prediction data, thermal power output data, load data and operation parameters of a proud pumped storage power station unit.
Referring to fig. 2, fig. 2 is a diagram illustrating a net load peak clipping and valley filling mechanism according to an embodiment of the present invention. When the wind power has a reverse peak-load phenomenon, the peak-valley difference of the net load curve is increased, the middle value of the net load peak-valley is taken as a middle reference line, and the fluctuation of the net load curve is generally considered to be stabilized to 70% above and below the middle reference line so as to ensure the power supply requirement of the load. Therefore, the area between the baseline and the net load peak value in the graph is the electric quantity needing peak clipping, and the area between the baseline and the net load valley value is the electric quantity needing valley filling.
Based on the annual wind power sampling data and system load data of the Monte-West wind farm 2020, the occurrence frequency of the wind power back peak shaving in each month is counted, as shown in Table 1.
TABLE 1. wind power inverse peak regulation frequency of each month in 2020 Mongolia
Figure BDA0003252593290000151
Figure BDA0003252593290000161
It can be seen that the frequency of the reverse peak regulation phenomenon of the wind power is far higher than that of the positive peak regulation in the year 2020 of Mongolia, the frequency of the reverse peak regulation of the wind power is over 70% every month, and the reverse peak regulation phenomenon is serious.
Referring to fig. 3, fig. 3 is a graph illustrating the increase degree of the net load peak-valley difference in the four seasons of the monte 2020 according to an embodiment of the present invention. Wherein the net load peak-valley difference increment in spring is the most, and is as high as 24.06 ten thousand MW, and the net load peak-valley difference increment in spring accounts for the total load peak-valley difference in spring, and is also the highest, and is 46.22%. The least increase in the net load peak-to-valley difference was in winter, 11.57 ten thousand MW, with a 29.85% duty cycle.
The net load peak-valley difference increment of the Monte-West 2020 in the whole year is about 69.36 ten thousand MW, which accounts for 39.46% of the load peak-valley difference in the whole year, and it can be seen that the net load peak-valley difference increment degree caused by the wind power reverse peak regulation phenomenon in the Monte-West region is higher, and the peak regulation problem is prominent.
Referring to fig. 4, fig. 4 is a graph of net load peak load off-peak load electric quantity required in the year 2020 in monte, according to an embodiment of the present invention. In spring, the peak clipping electric quantity and the valley filling electric quantity required by the net load are the largest and are 556.53 ten thousand MW & h and 521.65 ten thousand MW & h respectively, wherein the proportion of the peak clipping electric quantity required by the net load in the whole year is 35%, and the proportion of the valley filling electric quantity required by the net load in the whole year is 33.54%. In summer, the peak clipping electric quantity and the valley filling electric quantity required by the net load are minimum and are 277.49 ten thousand MW & h and 272.75 ten thousand MW & h respectively, wherein the proportion of the peak clipping electric quantity required by the net load to the whole year is 17.45 percent, and the proportion of the valley filling electric quantity required by the net load to the whole year is 17.53 percent.
In the Mongolian region 2020, the total electric quantity which needs to be subjected to peak clipping due to wind power grid-connected net load in the whole year is 1590.32 ten thousand MW & h, and the total electric quantity which needs to be subjected to valley filling is 1555.43 ten thousand MW & h.
Referring to fig. 5, fig. 5 is a diagram illustrating a peak clipping and valley filling effect statistics of a four-season pumped storage power station in 2020 by muncy according to an embodiment of the present invention. Under the action of the pumped storage power station, the peak clipping electric quantity and the valley filling electric quantity in spring are positioned at the first level and are respectively 25.7 ten thousand MW & h and 25.3 ten thousand MW & h. The peak clipping electric quantity and the valley filling electric quantity in summer are the lowest and are respectively 14.8 ten thousand MW & h and 13.2 ten thousand MW & h. According to statistics, the net load of the whole network in 2020 Mengxi can be subjected to peak clipping 76.1 ten thousand MW & h electric quantity under the action of a proud pumped storage power station, and can fill up a valley 76.4 ten thousand MW & h electric quantity, which respectively account for 4.79% and 4.91% of peak clipping and valley filling electric quantity required by the net load. On the premise that the net load of wind power is considered for the Monte grid, the pumped storage unit plays a considerable role.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a wind power grid-connected peak-reduction capability evaluation system provided by the embodiment of the invention. The wind power grid-connected down-peak regulation capability evaluation system provided by the invention is described below, and the wind power grid-connected down-peak regulation capability evaluation system described below and the wind power grid-connected down-peak regulation capability evaluation method described above can be referred to correspondingly. The embodiment of the invention provides a peak-down capacity evaluation system under wind power integration, which comprises: an objective function establishing module 210, a constraint condition determining module 220 and an actual electric quantity calculating module 230.
The objective function establishing module 210 is configured to obtain a first objective function and/or a second objective function, where the first objective function is established by using the power required to peak clipping as a first index target, and the second objective function is established by using the power required to valley filling as a second index target;
the constraint condition determining module 220 is used for determining constraint conditions of the operation characteristics of the power system under the wind power integration;
and the actual electric quantity calculating module 230 is configured to calculate an actual peak clipping electric quantity of the pumped storage power station and/or an actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
Fig. 7 illustrates a physical structure diagram of an electronic device, and as shown in fig. 7, the electronic device may include: a processor (processor)310, a communication Interface (communication Interface)320, a memory (memory)330 and a communication bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 communicate with each other via the communication bus 340. Processor 310 may invoke logic instructions in memory 330 to perform a wind grid turndown capability assessment method comprising: acquiring a first objective function and/or a second objective function, wherein the first objective function is constructed by taking the peak clipping required electric quantity as a first index target, and the second objective function is constructed by taking the valley filling required electric quantity as a second index target; determining constraint conditions of the operating characteristics of the power system under wind power integration; and calculating the actual peak clipping electric quantity and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
In addition, the logic instructions in the memory 330 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention further provides a computer program product, where the computer program product includes a computer program, the computer program may be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, a computer can execute the wind power grid-down peak-regulation capability evaluation method provided by the above methods, where the method includes: acquiring a first objective function and/or a second objective function, wherein the first objective function is constructed by taking the peak clipping required electric quantity as a first index target, and the second objective function is constructed by taking the valley filling required electric quantity as a second index target; determining constraint conditions of the operating characteristics of the power system under wind power integration; and calculating the actual peak clipping electric quantity and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
In another aspect, the present invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, where the computer program is implemented to, when executed by a processor, perform the wind power grid-connection peak-reduction capability evaluation method provided by the foregoing methods, where the method includes: acquiring a first objective function and/or a second objective function, wherein the first objective function is constructed by taking the peak clipping required electric quantity as a first index target, and the second objective function is constructed by taking the valley filling required electric quantity as a second index target; determining constraint conditions of the operating characteristics of the power system under wind power integration; and calculating the actual peak clipping electric quantity and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for evaluating peak-reducing capacity during wind power integration is characterized by comprising the following steps:
acquiring a first objective function and/or a second objective function, wherein the first objective function is constructed by taking the required peak clipping electric quantity as a first index target, and the second objective function is constructed by taking the required valley filling electric quantity as a second index target;
determining constraint conditions of the operating characteristics of the power system under wind power integration;
and calculating the actual peak clipping electric quantity of the pumped storage power station and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
2. The wind power grid-connected down-peak regulation capability assessment method according to claim 1, wherein the first objective function is:
Figure FDA0003252593280000011
the second objective function is:
Figure FDA0003252593280000012
wherein E isclipIndicating the electric quantity needing peak clipping; efillIndicating the required valley filling electric quantity; delta P'dif(τ) represents the system net load peak to valley difference; pNet(t) representing the net load power after wind power integration at the time t; pvalley(τ) represents the net load valley; t is t1、t2Representing the time starting and ending value of peak clipping; τ denotes a time parameter.
3. The method for evaluating the peak-reduction capability during wind power integration according to claim 1 or 2, wherein the constraint condition comprises a power system requirement and an operation constraint condition;
the power system requirements and operation constraint conditions comprise power balance constraint conditions and thermal power unit output constraint conditions;
the power balance constraint conditions are as follows:
Figure FDA0003252593280000013
the output constraint conditions of the thermal power generating unit are as follows:
Ph,min≤Ph,t≤Ph,max；
wherein h is the index number of the thermal power generating unit, N is the total number of the thermal power generating units, and Ph,tRepresenting the output of the thermal power generating unit h at the time t; i is the index number of the pumped storage unit, M is the total number of the pumped storage unit,
Figure FDA0003252593280000021
representing the power generation output of the pumped storage unit i at the time t;
Figure FDA0003252593280000022
the pumping output of the pumped storage unit i at the time t is represented; j is the index number of the wind turbine generator, Q is the total number of the wind turbine generator,
Figure FDA0003252593280000023
representing wind turbine j at time tForce is exerted; ptThe load output force at the time t is represented; ph,maxRepresenting the h maximum output of the thermal power generating unit; ph,minAnd (4) representing the minimum output of the thermal power generating unit h.
4. The wind power grid-connected peak-reduction capability evaluation method according to claim 3, wherein the constraint condition further comprises a pumped storage unit constraint condition;
the constraint conditions of the pumped storage group comprise a reservoir capacity constraint condition of the pumped storage power station, a reservoir electric quantity balance constraint condition of the pumped storage power station and a power generation and pumping power constraint condition of the pumped storage group;
the constraint conditions of the storage capacity of the pumped storage power station are as follows:
Figure FDA0003252593280000024
the reservoir electric quantity balance constraint conditions of the pumped storage power station comprise electric quantity balance constraint conditions under a pumping working condition and electric quantity balance constraint conditions under a power generation working condition;
the water pumping condition electric quantity balance constraint conditions are as follows:
Figure FDA0003252593280000025
Figure FDA0003252593280000026
the power generation working condition electric quantity balance constraint conditions are as follows:
Figure FDA0003252593280000031
the constraint conditions of the power generation and pumping power of the pumped storage unit are as follows:
Figure FDA0003252593280000032
wherein the content of the first and second substances,
Figure FDA0003252593280000033
is the lower limit of the electric quantity of the upper reservoir,
Figure FDA0003252593280000034
the lower limit of the electric quantity of the drainage reservoir;
Figure FDA0003252593280000035
is the upper limit of the electric quantity of the upper reservoir,
Figure FDA0003252593280000036
is the upper limit of the lower reservoir;
Figure FDA0003252593280000037
the electric quantity of the upper reservoir at the moment t,
Figure FDA0003252593280000038
the electric quantity of the reservoir at the moment t;
Figure FDA0003252593280000039
representing the electric quantity of the reservoir at the moment t +1,
Figure FDA00032525932800000310
representing the electric quantity of the water reservoir at the moment of t + 1;
Figure FDA00032525932800000311
representing the power generation output of the pumped storage unit i at the time t;
Figure FDA00032525932800000312
the pumping output of the pumped storage unit i at the time t is represented; etagRepresenting the power generation efficiency of the pumped storage unit; etapIndicating the pumping efficiency of a pumped storage unitRate; lambda is the time interval of the output force of the pumped storage unit;
Figure FDA00032525932800000313
the minimum power is generated for the pumped storage group,
Figure FDA00032525932800000314
pumping water for the pumped storage unit with minimum power;
Figure FDA00032525932800000315
the maximum power of the pumped storage group is generated,
Figure FDA00032525932800000316
the maximum power for pumping the water of the pumped storage unit is achieved.
5. The wind power grid-connected down-peak regulation capability assessment method according to claim 1, characterized in that the method further comprises:
acquiring the occurrence frequency of the anti-peak-shaving phenomenon, wherein the anti-peak-shaving frequency is the ratio of the number of days for the anti-peak-shaving phenomenon to the statistical period;
the frequency of occurrence of the anti-peaking phenomenon is used to assess the severity of the anti-peaking phenomenon.
6. The method for evaluating the peak-down regulation capability of the wind power integration according to claim 1 or 5, characterized by further comprising the following steps:
acquiring peak-to-valley difference variation, wherein the peak-to-valley difference variation is a variation value of a net load peak-to-valley difference after wind power integration;
the peak-to-valley difference variation is used to assess the severity of the back-peaking phenomenon.
7. A peak-reduction capability evaluation system under wind power integration is characterized by comprising:
the target function establishing module is used for acquiring a first target function and/or a second target function, wherein the first target function is established by taking the peak clipping required electric quantity as a first index target, and the second target function is established by taking the valley filling required electric quantity as a second index target;
the constraint condition determining module is used for determining constraint conditions of the operating characteristics of the power system under the wind power integration;
and the actual electric quantity calculating module is used for calculating the actual peak clipping electric quantity of the pumped storage power station and/or the actual valley filling electric quantity of the pumped storage power station based on the first objective function and/or the second objective function.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the wind power grid turn-down peak capability assessment method according to any one of claims 1 to 6 when executing the program.
9. A non-transitory computer readable storage medium, having a computer program stored thereon, wherein the computer program, when being executed by a processor, implements the steps of the wind grid turn-down capability assessment method according to any one of claims 1 to 6.
10. A computer program product comprising a computer program, wherein the computer program when executed by a processor implements the steps of the wind grid turn-down capability assessment method according to any one of claims 1 to 6.
CN202111050091.6A 2021-09-08 2021-09-08 Wind power grid-connected down-peak regulation capability assessment method and system Pending CN113765141A (en)

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