CN108960642B - New energy power plant dynamic polymerization method and system - Google Patents

New energy power plant dynamic polymerization method and system Download PDF

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CN108960642B
CN108960642B CN201810749437.3A CN201810749437A CN108960642B CN 108960642 B CN108960642 B CN 108960642B CN 201810749437 A CN201810749437 A CN 201810749437A CN 108960642 B CN108960642 B CN 108960642B
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new energy
energy power
power plant
peak
peak regulation
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CN108960642A (en
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李凤婷
周识远
陶仁峰
何世恩
丁坤
李津
张珍珍
高鹏飞
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Wind Power Technology Center Of State Grid Gansu Provincial Electric Power Co
State Grid Gansu Electric Power Co Ltd
Xinjiang University
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Wind Power Technology Center Of State Grid Gansu Provincial Electric Power Co
State Grid Gansu Electric Power Co Ltd
Xinjiang University
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
    • G06Q10/06312—Adjustment or analysis of established resource schedule, e.g. resource or task levelling, or dynamic rescheduling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • 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
    • H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

Abstract

The invention discloses a dynamic polymerization method and a dynamic polymerization system for a new energy power plant. The method comprises the following steps: dividing the new energy power plant into new energy power plant groups in different time periods according to the regional power grid load of the new energy power plant; calculating the cost of frequency modulation and peak regulation auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period; and aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy dispatching of the power grid in a cluster mode. According to the dynamic aggregation method and system for the new energy power plants, the existing passive response scheduling mode of independent participation of a single new energy power plant in a power grid is converted into the active power grid energy response scheduling mode of participation of a power group considering mutual assistance among power sources, the difficulty and complexity of energy scheduling of a new energy power generation access system can be reduced, and meanwhile, the probability of participation of each new energy power plant in power grid energy scheduling is increased.

Description

New energy power plant dynamic polymerization method and system
Technical Field
The invention relates to the field of new energy power generation and grid connection thereof, in particular to a dynamic polymerization method for a new energy power plant.
Background
In recent years, a Virtual Power Plant (VPP) technology, which is a new technical scheme for aggregating different types of distributed energy sources such as a distributed power source, an energy storage device, a controllable load, and an electric vehicle, has received attention from more and more experts and scholars in the technical fields of new energy power generation and grid connection. Although the technical scheme can effectively improve grid-connected consumption of distributed power generation and emphasize external functions and effects, the potential of the distributed power generation system widely applied to large-scale grid-connected consumption of new energy in China is very limited: on one hand, the virtual power plant technology improves distributed power generation grid-connected consumption mainly by means of coordinated operation and control among a distributed power supply, an energy storage device and a controllable load, even electric vehicles, and for new energy high-permeability power grids such as Xinjiang, Gansu and the like, the energy storage device, the controllable load and the electric vehicles are often scarce resources; on the other hand, the virtual power plant technology is mainly used for improving new energy grid-connected consumption in a distributed power generation grid-connected mode, and for new energy high-permeability power grids such as Xinjiang and Gansu, new energy power plants such as wind power plants and photovoltaic power plants are often in a centralized grid-connected mode. Therefore, the traditional virtual power plant technology is difficult to be directly applied to the improvement of the wind power and photovoltaic grid-connected consumption capability of the new energy high-permeability area.
Disclosure of Invention
The invention aims to provide a dynamic aggregation method and a dynamic aggregation system for new energy power plants, which are used for converting the existing passive response scheduling mode of independent participation of a single new energy power plant in a power grid into the active power grid energy response scheduling mode of participation of a power supply group considering mutual assistance among power supplies, reducing the difficulty and complexity of energy scheduling of new energy power generation access systems and increasing the probability of participation of each new energy power plant in power grid energy scheduling.
In order to achieve the purpose, the invention provides the following scheme:
a new energy power plant dynamic polymerization method, the method comprising:
dividing the new energy power plant into new energy power plant groups in different time periods according to the regional power grid load of the new energy power plant;
calculating the cost of frequency modulation and peak regulation auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period;
and aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy dispatching of the power grid in a cluster mode.
Optionally, the new energy power plant in different periods comprises a load valley period, a load usual period and a load peak period.
Optionally, the calculating cost of the frequency modulation and peak shaving auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period specifically includes:
determining the auxiliary cost of positive peak regulation and the auxiliary cost of negative peak regulation of each new energy power plant group in the load valley period;
determining the auxiliary cost of positive peak regulation and the auxiliary cost of reverse peak regulation of each new energy power plant group in the load peak period;
and determining the frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the load valley period, the load ordinary period and the load peak period.
Optionally, with a goal that frequency modulation and peak shaving auxiliary service cost caused by grid-connected new energy consumption are the lowest, the new energy power plants are aggregated to obtain a plurality of new energy power plant groups, so that the new energy power plants participate in energy scheduling of a power grid in a cluster manner, and the method specifically includes:
aiming at the lowest frequency modulation and peak regulation auxiliary service caused by grid-connected consumption of the new energy power plant, solving the aggregation mode of the new energy power plant at each time interval by adopting an intelligent algorithm to obtain a new energy power plant group at each time interval;
and in each time period, adopting the new energy power plant group corresponding to each time period to carry out energy scheduling on the power grid.
Optionally, the determining the auxiliary cost for positive peak regulation and the auxiliary cost for negative peak regulation of each new energy power plant group in the load valley period specifically includes:
Judging whether each new energy power plant group is in the positive peak regulation state in the load valley period, if so, calculating the auxiliary cost of the positive peak regulation of each new energy power plant group in the load valley period according to the output of the new energy power plant group in the positive peak regulation state and the price of the positive peak regulation;
and judging whether each new energy power plant group is reverse peak shaving or not in the load valley period, if so, calculating the auxiliary cost of reverse peak shaving of each new energy power plant group in the load valley period according to the output of the new energy power plant group in the reverse peak shaving period and the price of the reverse peak shaving.
Optionally, the determining the auxiliary cost for positive peak regulation and the auxiliary cost for negative peak regulation of each new energy power plant group in the peak load period specifically includes:
judging whether each new energy power plant group is in a positive peak regulation state in the peak load period, if so, calculating the auxiliary cost of the positive peak regulation of each new energy power plant group in the peak load period according to the output of the new energy power plant group in the peak regulation state and the price of the positive peak regulation state in the peak load period;
and judging whether each new energy power plant group is in reverse peak regulation at the peak load period, if so, calculating the auxiliary cost of reverse peak regulation of each new energy power plant group at the peak load period according to the output of the new energy power plant group at the peak reverse regulation period and the price of the reverse peak regulation.
Optionally, the determining of the frequency modulation auxiliary service cost caused by grid connection and consumption of each new energy power plant group in the load valley period, the normal period and the peak period specifically includes:
determining the frequency modulation auxiliary service price of each new energy power plant group in the load valley period according to the average output fluctuation condition of the new energy power plant group obtained by aggregation, and calculating the frequency modulation auxiliary service cost of each new energy power plant group in the load valley period;
determining the frequency modulation auxiliary service price of each new energy power plant group at the ordinary load time period according to the aggregated average output fluctuation condition of the new energy power plant group, and calculating the frequency modulation auxiliary service cost of each new energy power plant group at the ordinary load time period;
and determining the frequency modulation auxiliary service price of each new energy power plant group in the load peak period according to the aggregated average output fluctuation condition of the new energy power plant group, and calculating the frequency modulation auxiliary service cost of each new energy power plant group in the load peak period.
A new energy power plant dynamic aggregation system, the system comprising:
the time interval division module is used for dividing the new energy power plant into new energy power plant groups in different time intervals according to the regional power grid load of the new energy power plant;
the charge calculation module is used for calculating the charge of frequency modulation and peak regulation auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period;
And the aggregation module is used for aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy scheduling of the power grid in a cluster mode.
Optionally, the fee calculating module specifically includes:
the peak regulation cost calculation unit is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the load valley period;
the peak counter-regulation cost calculation unit is used for determining the auxiliary cost of peak counter-regulation of each new energy power plant group in the load valley period;
the peak regulation cost calculation unit is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the peak load period;
the peak counter-regulation cost calculation unit is used for determining the auxiliary cost of the peak counter-regulation of each new energy power plant group in the load valley period;
and the off-peak time frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the load off-peak time.
And the ordinary time period frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the ordinary time period.
And the peak time frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the peak time.
Optionally, the aggregation module specifically includes:
the aggregation unit is used for solving the aggregation mode of the new energy power plant at each time interval by adopting an intelligent algorithm to obtain the new energy power plant group at each time interval by taking the lowest frequency modulation and peak regulation auxiliary service caused by grid-connected consumption of the new energy power plant group as a target;
and the energy scheduling unit is used for scheduling the energy of the power grid by adopting the new energy power plant group corresponding to each time interval in each time interval.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a dynamic polymerization method of a new energy power plant, which comprises the steps of dividing the new energy power plant into new energy power plant groups in different time periods according to the load of a regional power grid where the new energy power plant is located; calculating the cost of frequency modulation and peak regulation auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period; and aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy dispatching of the power grid in a cluster mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a dynamic polymerization method of a new energy power plant according to an embodiment of the invention;
FIG. 2 is a structural diagram of a dynamic polymerization system of a new energy power plant according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the new energy power plant divided at different periods according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention aims to provide a dynamic aggregation method and a dynamic aggregation system for new energy power plants, which are used for converting the existing passive response scheduling mode of independent participation of a single new energy power plant in a power grid into the active power grid energy response scheduling mode of participation of a power supply group considering mutual assistance among power supplies, reducing the difficulty and complexity of energy scheduling of new energy power generation access systems and increasing the probability of participation of each new energy power plant in power grid energy scheduling.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a dynamic polymerization method for a new energy power plant according to an embodiment of the present invention, and as shown in fig. 1, the dynamic polymerization method for a new energy power plant provided by the present invention specifically includes the following steps:
step 101: dividing the new energy power plant into new energy power plant groups in different time periods according to the regional power grid load of the new energy power plant;
step 102: calculating the cost of frequency modulation and peak regulation auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period;
step 103: and aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy dispatching of the power grid in a cluster mode.
Wherein, step 101 specifically includes: the new energy power plant groups in different periods comprise load valley periods, load usual periods and load peak periods.
Step 102 specifically includes:
the method for judging whether the comprehensive output of the new energy power plant group obtained by load valley period polymerization presents positive peak regulation and negative peak regulation comprises the following steps:
The method for judging whether the comprehensive output of the new energy power plant group presents the positive peak regulation is determined by the formula (1):
Figure BDA0001725166460000061
in the formula, Pre，dg，ps+，-And Pre,dg,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputdg,ps+The value of the multiple is more than 1, and in the calculation process of the negative fluctuation accumulated value, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; and in the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated. When P is presentre,dg,ps+,-Greater than λdg.ps+·Pre,dg，ps+，+If so, judging that the new energy power plant is in the positive peak regulation characteristic in the load valley period, and calculating the auxiliary cost of the positive peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the positive peak regulation period in the load valley period and the price of the positive peak regulation;
the judgment that the comprehensive output of the new energy power plant group presents reverse peak regulation is determined by the formula (2):
Figure BDA0001725166460000071
in the formula, Pre,dg,ps-,+And Pre,dg,ps-,-Are respectively asPositive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output with comprehensive output showing reverse peak regulationdg,ps-Is a multiple between the two, and has a value greater than 1. In the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; and in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated. When P is present re,dg,ps-,+Greater than λdg.ps-·Pre,dg，ps-，-And then, judging that the new energy power plant is in the reverse peak regulation characteristic in the load valley period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the reverse peak regulation period in the load valley period and the price of the reverse peak regulation.
The method for judging whether the comprehensive output of the new energy power plant group obtained by aggregation in the load peak period presents positive peak regulation and negative peak regulation comprises the following steps:
the judgment that the comprehensive output of the new energy power plant group shows positive peak regulation is determined by the formula (3):
Figure BDA0001725166460000072
in the formula, Pre,gf,ps+,-And Pre,gf,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputgf,ps+The value is a multiple between the two, and is larger than 1. In the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; and in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated. When P is presentre,gf,ps+,+Greater than λgf.ps+·Pre,gf,ps+,-And then, judging that the new energy power plant is in a positive peak regulation characteristic in the peak load period, and outputting power according to the positive peak regulation characteristic in the peak load period of the new energy power plant Calculating the auxiliary cost of the positive peak regulation of each new energy power plant in the peak load period;
the judgment that the comprehensive output of the new energy power plant group presents reverse peak regulation is determined by the formula (4):
Figure BDA0001725166460000081
in the formula, Pre,gf,ps-,+And Pre,gf,ps-,-Respectively representing positive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output of reverse peak regulation for comprehensive outputgf,ps-The value is a multiple between the two, and is larger than 1. In the process of calculating the forward fluctuation accumulated value, when the output of the new energy power plant group fluctuates reversely, the fluctuation value is processed by 0, namely only the accumulation of the forward fluctuation is calculated; and in the negative fluctuation accumulated value calculation process, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated. When P is presentre,gf,ps-,-Greater than λgf.ps-·Pre,gf,ps-,+And then, judging that the new energy power plant is in a positive peak regulation characteristic in the peak load peak period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the peak load peak period according to the output of the new energy power plant in the reverse peak regulation period and the price of the reverse peak regulation.
The method for determining the frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the load valley period, the load ordinary period and the load peak period specifically comprises the following steps:
The price of the frequency modulation auxiliary service caused by the new energy grid-connected consumption at the load valley time, the common time and the peak time depends on the average output fluctuation condition of the new energy power plant group obtained by aggregation, and the measurement method comprises the following steps:
in the load valley period, the measurement method of the average output fluctuation of the new energy power plant group with the integrated output characteristic between the positive peak regulation and the negative peak regulation is as the formula (5):
Figure BDA0001725166460000091
in the formula,. DELTA.TdgThe duration time of the load valley period is delta t, and delta t represents the calculation time interval of the output fluctuation quantity of the new energy power plant group; round (Δ T)dg,/Δ T) for Δ TdgRounding off the value of/Δ t to give the whole, pre,fm,dg,i,Δt(r) is the fluctuation quantity of the ith delta t interval of the output of the ith new energy power plant group with the comprehensive output characteristic between the positive peak regulation and the negative peak regulation in the load trough period, and flusum，dg,iIs the mean value of the output fluctuation quantity S of the new energy power plant groupflu，dg，i，lowAnd Sflu,dg，i,uppAnd the two parameters respectively refer to the lower limit and the upper limit of the mean value of the output fluctuation quantity of the new energy power plant group, and the reference load valley time period power grid frequency modulation auxiliary service price. Determining the frequency modulation auxiliary service price of each new energy power plant in the load valley period according to the average output fluctuation condition of the new energy power plant group obtained by aggregation, and calculating the frequency modulation auxiliary service cost of each new energy power plant in the load valley period;
In the ordinary load period, the measurement method of the average fluctuation of the output of the new energy power plant group obtained by aggregation is as the formula (6):
Figure BDA0001725166460000092
in the formula,. DELTA.TpcThe duration of the load at the ordinary time interval is delta t, and the delta t represents the calculation time interval of the output fluctuation quantity of the new energy power plant group; round (Δ T)pc,/Δ T) for Δ TpcRounding off the value of/Δ t to give the whole, pre，fm，pc，i，Δt(r) is the fluctuation quantity of the output of the ith new energy power plant group in the load usual time period at the r delta t interval, flusum,pc,iIs the mean value of the output fluctuation quantity S of the new energy power plant groupflu，pc，i,lowAnd Sflu，pc，i,uppAnd respectively setting the lower limit and the upper limit of the mean value of the output fluctuation amount of the new energy power plant group, and the values of the two parameters refer to the frequency modulation auxiliary service price of the power grid at the ordinary time period of the load. Determining each new energy power plant in the ordinary load period according to the average fluctuation condition of the comprehensive output of the new energy power plant group obtained by polymerizationThe frequency modulation auxiliary service price is calculated, and the frequency modulation auxiliary service cost of each new energy power plant at the ordinary time of the load is calculated;
in the peak load period, the measurement method of the average output fluctuation of the new energy power plant group with the aggregated comprehensive output characteristic between the positive peak regulation and the negative peak regulation is as the formula (7):
Figure BDA0001725166460000101
in the formula,. DELTA.TgfThe duration time of the load peak period is, and delta t represents the calculation time interval of the output fluctuation quantity of the new energy power plant group; round (Δ T) gf,/Δ T) for Δ TgfRounding off the value of/Δ t to give the whole, pre,fm,gf,i,Δt(r) is the fluctuation quantity of the ith delta t interval of the output of the ith new energy power plant group with the comprehensive output characteristic between the positive peak regulation and the negative peak regulation in the load peak period, and flusum,gf,iIs the mean value of the output fluctuation quantity S of the new energy power plant groupflu，gf，i,lowAnd Sflu,gf,i,uppAnd respectively setting the lower limit and the upper limit of the mean value of the output fluctuation quantity of the new energy power plant group, and the values of the two parameters refer to the frequency modulation auxiliary service price of the power grid in the peak load period. And determining the frequency modulation auxiliary service price of each new energy power plant at the load peak time according to the aggregated average output fluctuation condition of the new energy power plant group, and calculating the frequency modulation auxiliary service cost of each new energy power plant at the load peak time.
The method for calculating the cost of the frequency modulation and peak shaving auxiliary service caused by new energy grid-connected consumption of each new energy power plant in each time period specifically comprises the following steps:
in the load valley period, the frequency modulation and peak shaving auxiliary service cost caused by new energy grid-connected consumption is calculated by using a formula (8), and the method comprises the following steps:
Figure BDA0001725166460000111
in the formula, tdg,initAnd Δ TdgRespectively the starting time and the duration of the load valley period; p is a radical ofdg,ps+、fdg,ps+And pre,dg,ps+(t) respectively representing the price and the cost of the peak regulation auxiliary service caused by the grid connection of the new energy power plant group with positive peak regulation on the comprehensive output obtained by polymerization and a value of the output value at t moment; p is a radical of dg,ps-、fdg,ps-And pre,dg,ps-(t) respectively representing the price and the cost of the peak regulation auxiliary service caused by the grid connection of the new energy power plant group with the inverse peak regulation on the comprehensive output obtained by polymerization and the output value at t moment; h isfm,dgAnd fdg,fmThe sum of the total number of new energy power plant groups with the aggregated comprehensive output characteristics between positive peak regulation and negative peak regulation and the cost of frequency modulation auxiliary service caused by the grid connection of the new energy power plant groups is obtained; p is a radical offm,dg,iAnd pre,fm,dg,i(t) the price of frequency modulation auxiliary service and the output value at t moment respectively caused by the fact that the comprehensive output characteristic obtained by polymerization is between the ith new energy power plant group grid connection of positive peak regulation and negative peak regulation, and fdgAnd the sum of the peak shaving and frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy power plant group in the valley period is shown.
In the ordinary time period of the load, the frequency modulation and peak shaving auxiliary service cost caused by new energy grid-connected consumption is calculated by using a formula (9), and the method comprises the following steps:
Figure BDA0001725166460000112
in the formula, tpc,initAnd Δ TpcRespectively the starting time and the duration of the load usual time interval; h ispcRepresenting the total number of the new energy power plant groups obtained by the polymerization in the period; f. ofpc,i、pfm,pc,iAnd pre,fm,pc,i(t) respectively giving out force values f at t moments of the cost and the price of frequency modulation auxiliary service caused by the grid connection of the ith new energy power plant group obtained by the time interval polymerization pcThe sum of the peak shaving and frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy power plant group in the ordinary time period is shown.
In the peak load period (including the peak period I and the peak period II), the frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption is calculated by using the formula (10), and the method comprises the following steps:
Figure BDA0001725166460000121
in the formula, tgf,initAnd Δ TgfRespectively the starting time and the duration time of the load peak time period; p is a radical ofgf,ps+、fgf,ps+And pre,gf,ps+(t) peak shaving auxiliary service price and cost and a t-moment output value caused by the grid connection of the new energy power plant group with positive peak shaving presented by the comprehensive output obtained by polymerization respectively; p is a radical ofgf,ps-、fgf,ps-And pre,gf,ps-(t) respectively representing the price and the cost of the peak regulation auxiliary service caused by the grid connection of the new energy power plant group with the inverse peak regulation on the comprehensive output obtained by polymerization and the output value at t moment; h isfm,gfAnd fgf,fmRespectively adding the total number of the new energy power plant groups with the comprehensive output characteristics between the positive peak regulation and the negative peak regulation obtained by polymerization and the frequency modulation auxiliary service cost caused by the grid connection of the new energy power plant groups; p is a radical offm,gf,i、fgf,fm,iAnd pre,gf,fm,i(t) price and cost of frequency modulation auxiliary service and t moment output value respectively caused by ith new energy power plant group grid connection with integrated output characteristic between positive peak regulation and negative peak regulation obtained by polymerization, f gfAnd the sum of the peak shaving and frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy power plant group in the peak time is shown.
Step 103 specifically comprises:
in the load valley period, the serial number of a new energy power plant group planned by each new energy power plant is taken as a variable (the variable takes a positive integer and is less than or equal to the total number of the new energy power plants), the lowest frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption is taken as a target, an intelligent algorithm is adopted to solve a result, and an objective function is as follows:
minfdg＝fdg,ps++fdg,ps-+fdg,fm
in the ordinary load period, the sequence number of a new energy power plant group to be planned in by each new energy power plant is taken as a variable (the variable takes a positive integer and is less than or equal to the total number of the new energy power plants), the lowest frequency modulation auxiliary service cost caused by new energy grid-connected consumption is taken as a target, an intelligent algorithm is adopted to solve a result, and an objective function is as follows:
Figure BDA0001725166460000122
in the load peak period, the sequence number of a new energy power plant group planned to be planned by each new energy power plant is taken as a variable (the variable value is a positive integer and is less than or equal to the total number of the new energy power plants), the minimum frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption is taken as a target, an intelligent algorithm is adopted to solve a result, and an objective function is as follows:
minfgf＝fgf,ps++fgf,ps-+fgf,fm
and aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy dispatching of the power grid in a cluster mode.
The invention provides a dynamic polymerization method of a new energy power plant, which divides the new energy power plant into new energy power plant groups at a load valley time period, a load usual time period and a load peak time period according to the load of a regional power grid where the new energy power plant is located, according to the auxiliary cost of positive peak regulation and the auxiliary cost of negative peak regulation of each new energy power plant group in the load valley period and the peak period and the auxiliary frequency modulation service cost caused by grid-connected consumption of each new energy power plant group in the load valley period, the normal period and the peak period, the frequency modulation and peak regulation service cost caused by the grid-connected consumption of new energy power plants in each period is calculated, and the lowest frequency modulation and peak regulation auxiliary service cost caused by the grid-connected consumption of new energy is taken as a target, and aggregating the new energy power plants to obtain a plurality of new energy power plant groups, so that the new energy power plants participate in energy scheduling of the power grid in a cluster mode.
Fig. 2 is a flowchart of a dynamic polymerization method for a new energy power plant according to an embodiment of the present invention, and as shown in fig. 2, the steps of the dynamic polymerization system for a new energy power plant provided by the present invention are specifically as follows:
the time interval division module 201 is used for dividing the new energy power plant into new energy power plant groups in different time intervals according to the load of a regional power grid where the new energy power plant is located;
The cost calculation module 202 is used for calculating the cost of frequency modulation and peak shaving auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period;
and the aggregation module 203 is used for aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy scheduling of the power grid in a cluster mode.
Wherein, step 201 specifically includes: the new energy power plant group in different periods comprises a load valley period unit, a load usual period unit and a load peak period unit.
Step 202 specifically includes:
the peak regulation cost calculation unit in the valley period is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the load valley period, and specifically comprises the following steps:
the method for judging whether the integrated output of the new energy power plant group presents the positive peak regulation is determined by a formula (1):
Figure BDA0001725166460000141
in the formula, Pre,dg,ps+,-And Pre,dg,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputdg,ps+The value of the multiple is more than 1, and in the calculation process of the negative fluctuation accumulated value, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; and in the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated. When P is present re,dg,ps+,-Greater than λdg.ps+·Pre,dg，ps+，+Then, it is determinedWhen the new energy power plant is in the positive peak regulation characteristic in the load valley period, calculating the auxiliary cost of the positive peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the positive peak regulation period and the price of the positive peak regulation;
the counter peak regulation cost calculation unit in the valley period is used for determining the auxiliary cost of counter peak regulation of each new energy power plant group in the load valley period, and specifically comprises the following steps:
the peak regulation judging subunit in the valley period is used for judging whether the comprehensive output of the new energy power plant group shows peak regulation or not according to a formula (2):
Figure BDA0001725166460000151
in the formula, Pre,dg,ps-,+And Pre,dg,ps-,-Respectively representing positive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output of reverse peak regulation for comprehensive outputdg,ps-Is a multiple between the two, and has a value greater than 1. In the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; and in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated. When P is presentre,dg,ps-,+Greater than λdg.ps-·Pre,dg，ps-，-And then, judging that the new energy power plant is in the reverse peak regulation characteristic in the load valley period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the reverse peak regulation period in the load valley period and the price of the reverse peak regulation.
The peak regulation cost calculation unit in the peak period is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the peak period, and specifically comprises the following steps:
the peak regulation judging subunit in the peak period determines the judgment that the comprehensive output of the new energy power plant group shows the peak regulation according to the formula (3):
Figure BDA0001725166460000152
in the formula, Pre,gf,ps+,-And Pre,gf,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputgf,ps+The value is a multiple between the two, and is larger than 1. In the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; and in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated. When P is presentre,gf,ps+,+Greater than λgf.ps+·Pre,gf,ps+,-Then, judging that the new energy power plant is in a positive peak regulation characteristic in the peak load period, and calculating the auxiliary cost of the positive peak regulation of each new energy power plant in the peak load period according to the output of the new energy power plant in the peak load period and the price of the positive peak regulation;
the peak period counter-peak regulation cost calculation unit is used for determining the auxiliary cost of counter-peak regulation of each new energy power plant group in the load valley period, and specifically comprises the following steps:
The peak-counter regulation judging subunit in the peak period determines the judgment that the comprehensive output of the new energy power plant group shows the peak-counter regulation according to the formula (4):
Figure BDA0001725166460000161
in the formula, Pre,gf,ps-,+And Pre,gf,ps-,-Respectively representing positive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output of reverse peak regulation for comprehensive outputgf,ps-The value is a multiple between the two, and is larger than 1. In the process of calculating the forward fluctuation accumulated value, when the output of the new energy power plant group fluctuates reversely, the fluctuation value is processed by 0, namely only the accumulation of the forward fluctuation is calculated; in the process of calculating the negative fluctuation accumulated value, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed as 0,i.e. only the accumulation of negative fluctuations is calculated. When P is presentre,gf,ps-,-Greater than λgf.ps-·Pre,gf,ps-,+And then, judging that the new energy power plant is in a positive peak regulation characteristic in the peak load peak period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the peak load peak period according to the output of the new energy power plant in the reverse peak regulation period and the price of the reverse peak regulation.
The unit for calculating the frequency modulation cost in the valley period is used for determining the frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy power plant group in the load valley period, and specifically comprises the following steps:
the method comprises a sub-unit for determining the frequency modulation price in the valley time, wherein the price of the frequency modulation auxiliary service caused by the new energy grid-connected consumption in the load valley time depends on the average fluctuation condition of the comprehensive output of the new energy power plant group obtained by aggregation, and the measurement method is as shown in a formula (5):
Figure BDA0001725166460000171
In the formula,. DELTA.TdgThe duration time of the load valley period is delta t, and delta t represents the calculation time interval of the output fluctuation quantity of the new energy power plant group; round (Δ T)dg,/Δ T) for Δ TdgRounding off the value of/Δ t to give the whole, pre,fm,dg,i,Δt(r) is the fluctuation quantity of the ith delta t interval of the output of the ith new energy power plant group with the comprehensive output characteristic between the positive peak regulation and the negative peak regulation in the load trough period, and flusum,dg,iIs the mean value of the output fluctuation quantity S of the new energy power plant groupflu,dg,i,lowAnd Sflu,dg,i,uppAnd the two parameters respectively refer to the lower limit and the upper limit of the mean value of the output fluctuation quantity of the new energy power plant group, and the reference load valley time period power grid frequency modulation auxiliary service price. Determining the frequency modulation auxiliary service price of each new energy power plant in the load valley period according to the average output fluctuation condition of the new energy power plant group obtained by aggregation, and calculating the frequency modulation auxiliary service cost of each new energy power plant in the load valley period;
the ordinary time period frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the ordinary time period, and specifically comprises the following steps:
the method comprises a frequency modulation price determining subunit in an ordinary time period, wherein the price of frequency modulation auxiliary service caused by load and new energy grid-connected consumption in the ordinary time period depends on the average output fluctuation condition of a new energy power plant group obtained by aggregation, and the measurement method is as shown in a formula (6):
Figure BDA0001725166460000172
In the formula,. DELTA.TpcThe duration of the load at the ordinary time interval is delta t, and the delta t represents the calculation time interval of the output fluctuation quantity of the new energy power plant group; round (Δ T)pc,/Δ T) for Δ TpcRounding off the value of/Δ t to give the whole, pre,fm,pc，i，Δt(r) is the fluctuation quantity of the output of the ith new energy power plant group in the load usual time period at the r delta t interval, flusum,pc,iIs the mean value of the output fluctuation quantity S of the new energy power plant groupflu,pc,i,lowAnd Sflu,pc,i,uppAnd respectively setting the lower limit and the upper limit of the mean value of the output fluctuation amount of the new energy power plant group, and the values of the two parameters refer to the frequency modulation auxiliary service price of the power grid at the ordinary time period of the load. Determining the frequency modulation auxiliary service price of each new energy power plant at the ordinary time of the load according to the average output fluctuation condition of the new energy power plant group obtained by aggregation, and calculating the frequency modulation auxiliary service cost of each new energy power plant at the ordinary time of the load;
the peak-hour frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy power plant group in the peak hour, and specifically comprises the following steps:
the peak time frequency modulation price determining subunit determines the price of the frequency modulation auxiliary service caused by the new energy grid-connected consumption at the peak time of load depending on the aggregated average output fluctuation condition of the new energy power plant group, and the measurement method is as the following formula (7):
Figure BDA0001725166460000181
In the formula,. DELTA.TgfFor the duration of the peak load period, Δ t represents the new energy power plantCalculating time intervals of the group output fluctuation amount; round (Δ T)gf,/Δ T) for Δ TgfRounding off the value of/Δ t to give the whole, pre，fm，gf，i，Δt(r) is the fluctuation quantity of the ith delta t interval of the output of the ith new energy power plant group with the comprehensive output characteristic between the positive peak regulation and the negative peak regulation in the load peak period, and flusum,gf,iIs the mean value of the output fluctuation quantity S of the new energy power plant groupflu，gf，i,lowAnd Sflu，gf，i，uppAnd respectively setting the lower limit and the upper limit of the mean value of the output fluctuation quantity of the new energy power plant group, and the values of the two parameters refer to the frequency modulation auxiliary service price of the power grid in the peak load period. And determining the frequency modulation auxiliary service price of each new energy power plant at the load peak time according to the aggregated average output fluctuation condition of the new energy power plant group, and calculating the frequency modulation auxiliary service cost of each new energy power plant at the load peak time.
The peak regulation and frequency modulation cost calculation unit is used for calculating the cost of frequency modulation and peak regulation auxiliary services caused by new energy grid-connected consumption of each new energy power plant group in each time period, and specifically comprises the following steps:
the load low-valley period peak regulation and frequency modulation cost calculation subunit calculates the frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption by using a formula (8), and the method comprises the following steps:
Figure BDA0001725166460000191
In the formula, tdg,initAnd Δ TdgRespectively the starting time and the duration of the load valley period; p is a radical ofdg,ps+、fdg,ps+And pre,dg,ps+(t) respectively representing the price and the cost of the peak regulation auxiliary service caused by the grid connection of the new energy power plant group with positive peak regulation on the comprehensive output obtained by polymerization and a value of the output value at t moment; p is a radical ofdg,ps-、fdg,ps-And pre,dg,ps-(t) respectively representing the price and the cost of the peak regulation auxiliary service caused by the grid connection of the new energy power plant group with the inverse peak regulation on the comprehensive output obtained by polymerization and the output value at t moment; h isfm,dgAnd fdg,fmThe resultant output characteristic for the polymerization being between positive and negative peak-shavingThe sum of the total number of new energy power plant groups and the cost of frequency modulation auxiliary service caused by grid connection of the new energy power plant groups; p is a radical offm,dg,iAnd pre,fm,dg,i(t) the price of frequency modulation auxiliary service and the output value at t moment respectively caused by the fact that the comprehensive output characteristic obtained by polymerization is between the ith new energy power plant group grid connection of positive peak regulation and negative peak regulation, and fdgAnd the sum of the peak shaving and frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy power plant group in the valley period is shown.
The load ordinary time peak regulation and frequency modulation cost calculation subunit calculates the frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption by using a formula (9), and the method comprises the following steps:
Figure BDA0001725166460000192
in the formula, tpc,initAnd Δ T pcRespectively the starting time and the duration of the load usual time interval; h ispcRepresenting the total number of the new energy power plant groups obtained by the polymerization in the period; f. ofpc,i、pfm,pc,iAnd pre,fm,pc,i(t) respectively giving out force values f at t moments of the cost and the price of frequency modulation auxiliary service caused by the grid connection of the ith new energy power plant group obtained by the time interval polymerizationpcAnd the sum of frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in a common time period is represented.
The peak regulation and frequency modulation cost calculation subunit calculates frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption by using a formula (10) in the peak load period (including a peak period I and a peak period II), and the following steps are performed:
Figure BDA0001725166460000201
in the formula, tgf,initAnd Δ TgfRespectively the starting time and the duration time of the load peak time period; p is a radical ofgf,ps+、fgf,ps+And pre,gf,ps+(t) the respective integrated output obtained for the polymerization exhibits a positive peak regulationThe peak shaving auxiliary service price, the cost and the force value at t moment caused by the grid connection of the new energy power plant group; p is a radical ofgf,ps-、fgf,ps-And pre,gf,ps-(t) respectively representing the price and the cost of the peak regulation auxiliary service caused by the grid connection of the new energy power plant group with the inverse peak regulation on the comprehensive output obtained by polymerization and the output value at t moment; h isfm,gfAnd fgf,fmRespectively adding the total number of the new energy power plant groups with the comprehensive output characteristics between the positive peak regulation and the negative peak regulation obtained by polymerization and the frequency modulation auxiliary service cost caused by the grid connection of the new energy power plant groups; p is a radical of fm,gf,i、fgf,fm,iAnd pre,gf,fm,i(t) price and cost of frequency modulation auxiliary service and t moment output value respectively caused by ith new energy power plant group grid connection with integrated output characteristic between positive peak regulation and negative peak regulation obtained by polymerization, fgfAnd the sum of the peak shaving and frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy power plant group in the peak time is shown.
Step 203 specifically includes:
the aggregation unit is used for solving the aggregation mode of the new energy power plant at each time interval by adopting an intelligent algorithm to obtain the new energy power plant group at each time interval by taking the lowest frequency modulation and peak regulation auxiliary service caused by grid-connected consumption of the new energy power plant group as a target;
in the load valley period, the serial number of a new energy power plant group planned by each new energy power plant is taken as a variable (the variable takes a positive integer and is less than or equal to the total number of the new energy power plants), the lowest frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption is taken as a target, an intelligent algorithm is adopted to solve a result, and an objective function is as follows:
minfdg＝fdg,ps++fdg,ps-+fdg,fm
in the ordinary load period, the sequence number of a new energy power plant group to be planned in by each new energy power plant is taken as a variable (the variable takes a positive integer and is less than or equal to the total number of the new energy power plants), the lowest frequency modulation auxiliary service cost caused by new energy grid-connected consumption is taken as a target, an intelligent algorithm is adopted to solve a result, and an objective function is as follows:
Figure BDA0001725166460000211
In the load peak period, the sequence number of a new energy power plant group planned to be planned by each new energy power plant is taken as a variable (the variable value is a positive integer and is less than or equal to the total number of the new energy power plants), the minimum frequency modulation and peak regulation auxiliary service cost caused by new energy grid-connected consumption is taken as a target, an intelligent algorithm is adopted to solve a result, and an objective function is as follows:
minfgf＝fgf,ps++fgf,ps-+fgf,fm
and the energy scheduling unit is used for scheduling the energy of the power grid by adopting the new energy power plant group corresponding to each time interval in each time interval.
Fig. 3 is a schematic diagram of a time interval division structure of a new energy power plant according to an embodiment of the present invention, and as shown in fig. 3, the new energy power plant is divided into new energy power plant groups in different time intervals according to a load of a regional power grid in which the new energy power plant is located, where the new energy power plant groups include a load valley time interval 1, a load normal time interval 2, a load peak time interval i 3, and a peak time interval ii 4. And aggregating the new energy power plants to obtain a plurality of new energy power plant groups by aiming at the lowest frequency modulation and peak shaving auxiliary service cost caused by new energy grid-connected consumption in each time period, so that the new energy power plants participate in energy scheduling of the power grid in a cluster mode.
The invention provides a dynamic aggregation system of a new energy power plant, which divides the new energy power plant into new energy power plant groups at a load valley time period, a load usual time period and a load peak time period according to the load of a regional power grid where the new energy power plant is located, according to the auxiliary cost of positive peak regulation and the auxiliary cost of negative peak regulation of each new energy power plant group in the load valley period and the peak period and the auxiliary frequency modulation service cost caused by grid-connected consumption of each new energy power plant group in the load valley period, the normal period and the peak period, the frequency modulation and peak regulation service cost caused by the grid-connected consumption of new energy power plants in each period is calculated, and the lowest frequency modulation and peak regulation auxiliary service cost caused by the grid-connected consumption of new energy is taken as a target, and aggregating the new energy power plants to obtain a plurality of new energy power plant groups, so that the new energy power plants participate in energy scheduling of the power grid in a cluster mode.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (5)

1. A dynamic polymerization method for a new energy power plant is characterized by comprising the following steps:
dividing the new energy power plant into new energy power plant groups in different time periods according to the regional power grid load of the new energy power plant;
calculating the cost of frequency modulation and peak regulation auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period;
Aggregating the new energy power plants to obtain a plurality of new energy power plant groups by aiming at the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption, so that the new energy power plants participate in energy dispatching of the power grid in a cluster mode;
the method for calculating the cost of the frequency modulation and peak shaving auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period specifically comprises the following steps:
determining the auxiliary cost of positive peak regulation and the auxiliary cost of negative peak regulation of each new energy power plant group in the load valley period;
determining the auxiliary cost of positive peak regulation and the auxiliary cost of reverse peak regulation of each new energy power plant group in the load peak period;
determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in load valley time, ordinary time and peak time;
the determining of the auxiliary cost of the positive peak regulation and the auxiliary cost of the negative peak regulation of each new energy power plant group in the load valley period specifically comprises the following steps:
judging whether each new energy power plant group is in the positive peak regulation state in the load valley period, if so, calculating the auxiliary cost of the positive peak regulation of each new energy power plant group in the load valley period according to the output of the new energy power plant group in the positive peak regulation state and the price of the positive peak regulation;
Judging whether each new energy power plant group is reverse peak-shaving or not in the load valley period, if so, calculating the auxiliary cost of reverse peak-shaving of each new energy power plant group in the load valley period according to the output of the new energy power plant group in the reverse peak-shaving period and the price of the reverse peak-shaving;
the determining of the auxiliary cost of the positive peak regulation and the auxiliary cost of the negative peak regulation of each new energy power plant group in the load peak period specifically comprises the following steps:
judging whether each new energy power plant group is in a positive peak regulation state in the peak load period, if so, calculating the auxiliary cost of the positive peak regulation of each new energy power plant group in the peak load period according to the output of the new energy power plant group in the peak regulation state and the price of the positive peak regulation state in the peak load period;
judging whether each new energy power plant group is in reverse peak regulation at the peak load period, if so, calculating the auxiliary cost of reverse peak regulation of each new energy power plant group at the peak load period according to the output of the new energy power plant group at the peak reverse regulation period and the price of the reverse peak regulation;
the method for judging whether the comprehensive output of the new energy power plant group obtained by load valley period polymerization presents positive peak regulation and negative peak regulation comprises the following steps:
the method for judging whether the comprehensive output of the new energy power plant group presents the positive peak regulation is determined by the formula (1):
Figure FDA0003182216090000021
In the formula, Pre,dg,ps+,-And Pre,dg,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputdg,ps+Is a multiple between the two, and has a value greater than 1, pre,dg,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isdg,initAnd Δ TdgRespectively the starting time and the duration of the load valley period; in the process of calculating a negative fluctuation accumulated value, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; in the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; when P is presentre,dg,ps+,-Greater than λdg.ps+·Pre,dg,ps+,+If so, judging that the new energy power plant is in the positive peak regulation characteristic in the load valley period, and calculating the auxiliary cost of the positive peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the positive peak regulation period in the load valley period and the price of the positive peak regulation;
the judgment that the comprehensive output of the new energy power plant group presents reverse peak regulation is determined by the formula (2):
Figure FDA0003182216090000031
in the formula, Pre,dg,ps-,+And Pre,dg,ps-,-Respectively representing positive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output of reverse peak regulation for comprehensive output dg,ps-Is a multiple between the two, and has a value greater than 1; p is a radical ofre,dg,ps-(t) is a t moment output value, p, of the new energy power plant group grid connection caused by the inverse peak shaving of the comprehensive output obtained by polymerizationre,dg,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isdg,initAnd Δ TdgRespectively the starting time and the duration of the load valley period; in the calculation process of the forward fluctuation accumulated value, the new energy power plantWhen the group output force has negative fluctuation, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; when P is presentre,dg,ps-,+Greater than λdg.ps-·Pre,dg,ps-,-If so, judging that the new energy power plant is in the reverse peak regulation characteristic in the load valley period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the reverse peak regulation period and the price of the reverse peak regulation;
the method for judging whether the comprehensive output of the new energy power plant group obtained by aggregation in the load peak period presents positive peak regulation and negative peak regulation comprises the following steps:
the judgment that the comprehensive output of the new energy power plant group shows positive peak regulation is determined by the formula (3):
Figure FDA0003182216090000041
In the formula, Pre,gf,ps+,-And Pre,gf,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputgf,ps+The value is a multiple between the two and is more than 1; p is a radical ofre,gf,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isgf,initAnd Δ TgfRespectively the starting time and the duration time of the load peak time period; in the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; when P is presentre,gf,ps+,+Greater than λgf.ps+·Pre,gf,ps+,-And then, judging that the new energy power plant is in a positive peak regulation characteristic in the peak load period, and then, carrying out positive peak regulation according to the new energy power plant in the peak load periodThe output of the section and the price of the positive peak regulation are calculated, and the auxiliary cost of the positive peak regulation of each new energy power plant in the load peak period is calculated;
the judgment that the comprehensive output of the new energy power plant group presents reverse peak regulation is determined by the formula (4):
Figure FDA0003182216090000051
in the formula, Pre,gf,ps-,+And Pre,gf,ps-,-Respectively representing positive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output of reverse peak regulation for comprehensive output gf,ps-The value is a multiple between the two and is more than 1; p is a radical ofre,gf,ps-(t) is a t moment output value, p, of the new energy power plant group grid connection caused by the inverse peak shaving of the comprehensive output obtained by polymerizationre,gf,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isgf,initAnd Δ TgfRespectively the starting time and the duration time of the load peak time period; in the process of calculating the forward fluctuation accumulated value, when the output of the new energy power plant group fluctuates reversely, the fluctuation value is processed by 0, namely only the accumulation of the forward fluctuation is calculated; in the process of calculating the negative fluctuation accumulated value, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; when P is presentre,gf,ps-,-Greater than λgf.ps-·Pre,gf,ps-,+And then, judging that the new energy power plant is in a positive peak regulation characteristic in the peak load peak period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the peak load peak period according to the output of the new energy power plant in the reverse peak regulation period and the price of the reverse peak regulation.
2. The dynamic aggregation method for new energy power plants according to claim 1, wherein aiming at minimizing the frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption, the new energy power plants are aggregated to obtain a plurality of new energy power plant groups, so that the new energy power plants participate in energy scheduling of a power grid in a cluster manner, specifically comprising:
Aiming at the lowest frequency modulation and peak regulation auxiliary service caused by grid-connected consumption of the new energy power plant, solving the aggregation mode of the new energy power plant at each time interval by adopting an intelligent algorithm to obtain a new energy power plant group at each time interval;
and in each time period, adopting the new energy power plant group corresponding to each time period to carry out energy scheduling on the power grid.
3. The dynamic aggregation method for new energy plants according to claim 1, wherein the determining of the frequency modulation auxiliary service cost caused by grid-connected consumption of each new energy plant group in the load valley period, the normal period and the peak period specifically comprises:
determining the frequency modulation auxiliary service price of each new energy power plant group in the load valley period according to the average output fluctuation condition of the new energy power plant group obtained by aggregation, and calculating the frequency modulation auxiliary service cost of each new energy power plant group in the load valley period;
determining the frequency modulation auxiliary service price of each new energy power plant group at the ordinary load time period according to the aggregated average output fluctuation condition of the new energy power plant group, and calculating the frequency modulation auxiliary service cost of each new energy power plant group at the ordinary load time period;
and determining the frequency modulation auxiliary service price of each new energy power plant group in the load peak period according to the aggregated average output fluctuation condition of the new energy power plant group, and calculating the frequency modulation auxiliary service cost of each new energy power plant group in the load peak period.
4. A new energy power plant dynamic polymerization system, the system comprising:
the time interval division module is used for dividing the new energy power plant into new energy power plant groups in different time intervals according to the regional power grid load of the new energy power plant;
the charge calculation module is used for calculating the charge of frequency modulation and peak regulation auxiliary service caused by new energy grid-connected consumption of each new energy power plant group in each time period;
the aggregation module is used for aggregating the new energy power plants to obtain a plurality of new energy power plant groups by taking the lowest frequency modulation and peak shaving auxiliary service cost caused by the new energy grid-connected consumption as a target, so that the new energy power plants participate in energy scheduling of the power grid in a cluster mode;
the peak regulation cost calculation unit is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the load valley period;
the peak counter-regulation cost calculation unit is used for determining the auxiliary cost of peak counter-regulation of each new energy power plant group in the load valley period;
the peak regulation cost calculation unit is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the peak load period;
the peak counter-regulation cost calculation unit is used for determining the auxiliary cost of the peak counter-regulation of each new energy power plant group in the load valley period;
The system comprises a low-valley time frequency modulation cost calculation unit, a load low-valley time frequency modulation auxiliary service cost calculation unit and a load low-valley time frequency modulation auxiliary service cost calculation unit, wherein the low-valley time frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group;
the ordinary time period frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the ordinary time period;
the peak time frequency modulation cost calculation unit is used for determining frequency modulation auxiliary service cost caused by grid connection consumption of each new energy power plant group in the peak time;
the peak regulation cost calculation unit in the valley period is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the load valley period, and specifically comprises the following steps:
the method for judging whether the integrated output of the new energy power plant group presents the positive peak regulation is determined by a formula (1):
Figure FDA0003182216090000071
in the formula, Pre,dg,ps+,-And Pre,dg,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputdg,ps+Is a multiple between the two, and has a value greater than 1, pre,dg,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isdg,initAnd Δ TdgRespectively the starting time and the duration of the load valley period; in the process of calculating a negative fluctuation accumulated value, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; in the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; when P is present re,dg,ps+,-Greater than λdg.ps+·Pre,dg,ps+,+If so, judging that the new energy power plant is in the positive peak regulation characteristic in the load valley period, and calculating the auxiliary cost of the positive peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the positive peak regulation period in the load valley period and the price of the positive peak regulation;
the counter peak regulation cost calculation unit in the valley period is used for determining the auxiliary cost of counter peak regulation of each new energy power plant group in the load valley period, and specifically comprises the following steps:
the peak regulation judging subunit in the valley period is used for judging whether the comprehensive output of the new energy power plant group shows peak regulation or not according to a formula (2):
Figure FDA0003182216090000081
in the formula, Pre,dg,ps-,+And Pre,dg,ps-,-Respectively representing positive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output of reverse peak regulation for comprehensive outputdg,ps-Is a multiple between the two, and has a value greater than 1; p is a radical ofre,dg,ps-(t) is a t moment output value, p, of the new energy power plant group grid connection caused by the inverse peak shaving of the comprehensive output obtained by polymerizationre,dg,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isdg,initAnd Δ TdgRespectively the starting time and the duration of the load valley period; in the forward directionIn the process of calculating the fluctuation accumulated value, when the output of the new energy power plant group fluctuates in a negative direction, the fluctuation value is processed by 0, namely only the accumulation of positive fluctuation is calculated; in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; when P is present re,dg,ps-,+Greater than λdg.ps-·Pre,dg,ps-,-If so, judging that the new energy power plant is in the reverse peak regulation characteristic in the load valley period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the load valley period according to the output of the new energy power plant in the reverse peak regulation period and the price of the reverse peak regulation;
the peak regulation cost calculation unit in the peak period is used for determining the auxiliary cost of the peak regulation of each new energy power plant group in the peak period, and specifically comprises the following steps:
the peak regulation judging subunit in the peak period determines the judgment that the comprehensive output of the new energy power plant group shows the peak regulation according to the formula (3):
Figure FDA0003182216090000091
in the formula, Pre,gf,ps+,-And Pre,gf,ps+,+Negative fluctuation accumulated value and positive fluctuation accumulated value, lambda, of new energy power plant group output showing positive peak regulation for comprehensive outputgf,ps+The value is a multiple between the two and is more than 1; p is a radical ofre,gf,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isgf,initAnd Δ TgfRespectively the starting time and the duration time of the load peak time period; in the process of calculating the positive fluctuation accumulated value, when the output of the new energy power plant group fluctuates negatively, the fluctuation value is processed by 0, namely only the accumulation of the positive fluctuation is calculated; in the process of calculating the reverse fluctuation accumulated value, when the output of the new energy power plant group fluctuates in the positive direction, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; when P is present re,gf,ps+,+Greater than λgf.ps+·Pre,gf,ps+,-Then, the peak load time is determinedWhen the new energy power plant is in the positive peak regulation characteristic, calculating the auxiliary cost of positive peak regulation of each new energy power plant in the load peak period according to the output of the new energy power plant in the positive peak regulation period and the price of the positive peak regulation;
the peak period counter-peak regulation cost calculation unit is used for determining the auxiliary cost of counter-peak regulation of each new energy power plant group in the load valley period, and specifically comprises the following steps:
the peak-counter regulation judging subunit in the peak period determines the judgment that the comprehensive output of the new energy power plant group shows the peak-counter regulation according to the formula (4):
Figure FDA0003182216090000101
in the formula, Pre,gf,ps-,+And Pre,gf,ps-,-Respectively representing positive fluctuation accumulated value and negative fluctuation accumulated value, lambda, of new energy power plant group output of reverse peak regulation for comprehensive outputgf,ps-The value is a multiple between the two and is more than 1; p is a radical ofre,gf,ps-(t) is a t moment output value, p, of the new energy power plant group grid connection caused by the inverse peak shaving of the comprehensive output obtained by polymerizationre,gf,ps+(t) is a t moment output value caused by the grid connection of a new energy power plant group with positive peak regulation of comprehensive output obtained by polymerization, and t isgf,initAnd Δ TgfRespectively the starting time and the duration time of the load peak time period; in the process of calculating the forward fluctuation accumulated value, when the output of the new energy power plant group fluctuates reversely, the fluctuation value is processed by 0, namely only the accumulation of the forward fluctuation is calculated; in the process of calculating the negative fluctuation accumulated value, when the output of the new energy power plant group fluctuates positively, the fluctuation value is processed by 0, namely only the accumulation of the negative fluctuation is calculated; when P is present re,gf,ps-,-Greater than λgf.ps-·Pre,gf,ps-,+And then, judging that the new energy power plant is in a positive peak regulation characteristic in the peak load peak period, and calculating the auxiliary cost of the reverse peak regulation of each new energy power plant in the peak load peak period according to the output of the new energy power plant in the reverse peak regulation period and the price of the reverse peak regulation.
5. The dynamic polymerization system of a new energy power plant according to claim 4, wherein the polymerization module specifically comprises:
the aggregation unit is used for solving the aggregation mode of the new energy power plant at each time interval by adopting an intelligent algorithm to obtain the new energy power plant group at each time interval by taking the lowest frequency modulation and peak regulation auxiliary service caused by grid-connected consumption of the new energy power plant group as a target;
and the energy scheduling unit is used for scheduling the energy of the power grid by adopting the new energy power plant group corresponding to each time interval in each time interval.
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