CN113890107B - Method and system for determining adjustment capacity by considering peak load new energy contribution rate - Google Patents
Method and system for determining adjustment capacity by considering peak load new energy contribution rate Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a method and a system for determining adjustment capacity by considering peak load new energy contribution rate, and belongs to the technical field of power system planning. The method of the invention comprises the following steps: determining a basic planning scheme of the power system; according to the basic planning scheme, carrying out production simulation calculation on the electric power system, and determining a minimum new energy peak load contribution value meeting preset requirements; and according to the minimum new energy peak load contribution value, determining that the power system increases the equipped regulating capacity when the power system has an extreme condition. The invention can determine the minimum new energy peak load contribution rate and determine the reasonable adjustment capacity required for meeting the fluctuation intermittence of the new energy according to the minimum new energy peak load contribution rate; the invention is applicable to actual large power grids, can ensure that the power balance of the system in a long time scale can meet the requirement of the system on the standby rate, and has great significance for ensuring the safety of the power grids; the index of the invention adopts analytic deduction, and has wider application range and high applicability.
Description
Technical Field
The invention relates to the technical field of power system planning, in particular to a method and a system for determining adjustment capacity by considering peak load new energy contribution rate.
Background
The energy structure in China takes fossil energy, especially coal as main, the total energy consumption amount is the first place in the world, and the energy consumption amount is continuously and rapidly increased, so that the ecological environment protection, pollution and emission reduction pressure brought by the energy structure are very outstanding, the life and sustainable development of people are seriously influenced, and the energy transformation and energy structure optimization are imperative to be greatly propelled. Along with the gradual replacement of fossil energy by renewable energy, a clean, low-carbon and high-efficiency energy system consisting of renewable energy is realized.
In a future power system, the new energy is a main body, and the new energy is particularly a main body of installation and electric quantity, is also a main body of responsibility, remarkably enhances the active supporting and adjusting capability and the fault crossing capability, obviously improves the technical economy, and is coordinated with the conventional energy and various energy storage. The new energy is actively supported and participated in regulation, the intermittent and random fluctuation of the new energy causes the fluctuation of the peak regulation demand capacity of the system to be increased, the peak regulation difficulty is increased, the regulation measures such as large-scale energy storage and multi-energy conversion are required to be introduced, and the balance mode of the power system is changed from a source load real-time balance mode to a non-complete real-time balance mode in a larger space and a larger time scale range which are participated in buffering by the large-scale energy storage and multi-energy conversion. Therefore, there is an urgent need to investigate how to determine the regulation measures that can meet the balance mode requirements of the power system.
Disclosure of Invention
Aiming at the problems, the invention provides a method for determining the adjustment capacity by considering the contribution rate of new energy sources of peak load, which comprises the following steps:
determining a basic planning scheme of the power system;
according to the basic planning scheme, carrying out production simulation calculation on the electric power system, and determining a minimum new energy peak load contribution value meeting preset requirements;
and according to the minimum new energy peak load contribution value, determining that the power system increases the equipped regulating capacity when the power system has an extreme condition.
Optionally, determining a basic planning scheme of the power system, specifically:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
according to a load curve and the principle of equal standby capacity, arranging the maintenance of a conventional unit of the power system;
and after the overhaul is completed, determining the target reserve rate and the peak load new energy contribution rate of the power system.
Optionally, the history data specifically includes: the method comprises the steps of presetting a load active power predicted value, a cross-region direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine active power predicted value sequence and a photovoltaic turbine active power predicted value sequence of a power system within a time.
Optionally, the calculation formula of the new energy contribution rate of peak load is as follows:
and the new energy contribution rate of peak load is more than or equal to 0 and less than or equal to 1.
Optionally, determining the minimum new energy peak load contribution value meeting the preset requirement specifically includes:
and (3) carrying out production simulation calculation on the power system, judging whether the power system is insufficient or not, wherein a judgment formula is as follows:
wherein: lambda (lambda) w For the output proportion, lambda of wind power participating in power balance s Taking the initial value of the contribution rate of new energy source of peak load as 0 and P for the output proportion of the photovoltaic participated in the power balance e (t) is the real-time output, P of the conventional unit W (t) is the real-time output and P of the wind turbine generator S (t) is the real-time output and P of the photovoltaic unit B1 (t) is the real-time output and P of the energy storage unit L (t) is the real-time output and P of the load unit D (t) is the real-time output of the DC unit;
if the calculation result is that the electric quantity is insufficient, judging whether an electric power system generates an electric quantity gap, if the electric quantity gap is generated in the load peak time or the load low valley time, adding a conventional unit, and if the electric quantity gap is generated in the load low valley time, adding the start-up of the thermal power unit or adding energy storage until the electric power system cannot generate the condition of insufficient electric quantity;
carrying out production simulation calculation of the power system again within the range of the new energy contribution rate of the peak load, obtaining a production simulation calculation result, judging the system reserve rate of the load peak period according to the production simulation calculation result, and ending the production simulation calculation until the system reserve rate is equal to the target reserve rate;
when the system reserve rate is equal to the target reserve rate, the value of the system reserve rate meets the preset requirement, and the minimum new energy peak load contribution rate value can be determined;
the calculation formula of the system reserve rate is as follows:
wherein P is B2 And (t) increasing the energy storage output when the electric quantity gap is generated in the load valley period.
Optionally, determining the adjustment capacity of the power system increase equipment is specifically:
when the calculated new energy source end condition output is 0, the power deficiency caused by the power system is as follows:
P Bneed ＝λ w P W (t)+λ s P S (t)
P Bneed the capacity is adjusted for the configuration.
The invention also provides a system for determining the adjustment capacity by considering the new energy contribution rate of peak load, which comprises:
a scheme determination unit that determines a basic planning scheme of the power system;
the simulation calculation unit is used for carrying out production simulation calculation on the power system according to the basic planning scheme and determining the minimum new energy peak load contribution value meeting the preset requirement;
and the calculation unit is used for determining that the power system increases the equipped regulating capacity when the power system has an extreme condition according to the minimum new energy peak load contribution value.
Optionally, the scheme determining unit is configured to determine a basic planning scheme of the power system, specifically:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
according to a load curve and the principle of equal standby capacity, arranging the maintenance of a conventional unit of the power system;
and after the overhaul is completed, determining the target reserve rate and the peak load new energy contribution rate of the power system.
Optionally, the scheme determining unit collects historical data of the power system specifically as follows: the method comprises the steps of presetting a load active power predicted value, a cross-region direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine active power predicted value sequence and a photovoltaic turbine active power predicted value sequence of a power system within a time.
Optionally, the calculation formula of the new energy contribution rate of peak load is as follows:
and the new energy contribution rate of peak load is more than or equal to 0 and less than or equal to 1.
Optionally, the simulation calculation unit determines a minimum new energy peak load contribution value meeting a preset requirement, and specifically includes:
and (3) carrying out production simulation calculation on the power system, judging whether the power system is insufficient or not, wherein a judgment formula is as follows:
wherein: lambda (lambda) w For the output proportion, lambda of wind power participating in power balance s Taking the initial value of the contribution rate of new energy source of peak load as 0 and P for the output proportion of the photovoltaic participated in the power balance e (t) is the real-time output, P of the conventional unit W (t) is the real-time output and P of the wind turbine generator S (t) is the real-time output and P of the photovoltaic unit B1 (t) is the real-time output and P of the energy storage unit L (t) is the real-time output and P of the load unit D (t) is the real-time output of the DC unit;
if the calculation result is that the electric quantity is insufficient, judging whether an electric power system generates an electric quantity gap, if the electric quantity gap is generated in the load peak time or the load low valley time, adding a conventional unit, and if the electric quantity gap is generated in the load low valley time, adding the start-up of the thermal power unit or adding energy storage until the electric power system cannot generate the condition of insufficient electric quantity;
carrying out production simulation calculation of the power system again within the range of the new energy contribution rate of the peak load, obtaining a production simulation calculation result, judging the system reserve rate of the load peak period according to the production simulation calculation result, and ending the production simulation calculation until the system reserve rate is equal to the target reserve rate;
when the system reserve rate is equal to the target reserve rate, the value of the system reserve rate meets the preset requirement, and the minimum new energy peak load contribution rate value can be determined;
the calculation formula of the system reserve rate is as follows:
wherein P is B2 And (t) increasing the energy storage output when the electric quantity gap is generated in the load valley period.
Optionally, the calculating unit determines an adjustment capacity of the power system increase equipment, specifically:
when the calculated new energy source end condition output is 0, the power deficiency caused by the power system is as follows:
P Bneed ＝λ w P W (t)+λ s P S (t)
P Bneed the capacity is adjusted for the configuration.
The invention can determine the minimum new energy peak load contribution rate and determine the reasonable adjustment capacity required for meeting the fluctuation intermittence of the new energy according to the minimum new energy peak load contribution rate; the invention is applicable to actual large power grids, can ensure that the power balance of the system in a long time scale can meet the requirement of the system on the standby rate, and has great significance for ensuring the safety of the power grids; the index of the invention adopts analytic deduction, and has wider application range and high applicability.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of an embodiment of the method of the present invention;
FIG. 3 is a graph of 8760 hours of power surplus for the northwest grid year when the initial contribution rate of the new energy peak load is 0 in an embodiment of the method of the invention;
FIG. 4 is a graph of 8760 hours of power surplus for a northwest power grid year when new energy participates in peak shaving in an embodiment of the method of the invention;
fig. 5 is a block diagram of the system of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention is further illustrated by the following examples:
the method of the invention, as shown in FIG. 1, comprises the following steps:
step 1: the basic planning scheme of the power system is determined, wherein the basic planning scheme comprises system load capacity, direct current capacity, various power supply installed capacities, a new energy output curve, a direct current power curve, system reserve rate requirements and the like.
Step 2: minimum new energy peak load contribution value lambda meeting reserve rate constraint based on production simulation calculation min 。
Step 3: based on the peak load contribution rate lambda of the minimum new energy min The adjustment capacity of the system is calculated to be increased to cope with the extreme case.
As shown in fig. 2, in which step 1: determining a basic planning scheme of an electric power system, wherein the basic planning scheme comprises system load capacity, direct current capacity, various power supply installed capacities, a new energy output curve, a direct current power curve, system reserve rate requirements and the like, and specifically comprises the following steps:
collecting and processing data;
according to historical data, collecting load active power predicted values and cross-region direct current power predicted values corresponding to 8760 hours continuously, starting a new energy grid-connected scale, a wind turbine active power predicted value sequence and a photovoltaic turbine active power predicted value sequence, and superposing each partition load curve, load reserve, accident reserve capacity and direct current output to the load curve to form a system comprehensive load curve.
A unit overhauling arrangement;
and arranging the conventional unit for maintenance according to the principle of equal standby capacity.
Determining a target standby rate beta of a system set ；
Determining a new energy peak load contribution rate lambda, wherein the new energy peak load contribution rate lambda refers to the proportion of actual output of new energy participating in balance at peak load moment to actual output of new energy peak load, namely:
namely, the output of the new energy participating in peak regulation accounts for the proportion of the real-time output of the new energy, and lambda is more than or equal to 0 and less than or equal to 1; lambda (lambda) w For the output proportion, lambda of wind power participating in power balance s The output ratio of the photovoltaic power balance is taken part in.
Step 2: calculating a minimum new energy peak load contribution value meeting the reserve rate constraint based on production simulation;
step 2-1, setting the initial contribution rate of the new energy peak load as 0;
step 2-2, performing production simulation calculation;
step 2-3, judging whether the system has electric quantity shortage E LOL The calculation formula of the electric quantity deficiency is shown as a formula (2).
Wherein: p (P) e (t)、P W (t)、P S (t)、P B1 (t)、P L (t)、P D And (t) respectively carrying out real-time output of a conventional unit, wind power, photovoltaic, energy storage, load and direct current.
Step 2-4, if the system has insufficient electric quantity, judging whether the gap of the electric quantity generated by the system is in a load peak period or a load valley period, and if the gap of the electric quantity generated by the system is in the load peak period, increasing a conventional assembly machine; if the load is low, the power gap is generated, and measures such as increasing the starting of the thermal power unit or increasing the energy storage are adopted, and the increased energy storage capacity is recorded as P B2 。
And step 2-5, repeating the steps 2-2 to 2-4 until the system has no insufficient electric quantity.
Step 2-6, optionally setting new energy peak load contribution rate lambda between 0 and 1, carrying out production simulation calculation again, and judging whether the standby rate of the system in the load peak time period can meet the requirement according to the production simulation result. The calculation formula of the real-time reserve rate beta is shown in formula (3), and the reserve rate at this time can be recorded as beta.
Step 2-7, if beta is not less than beta set Ending the whole flow, the system needs to increase the equipped adjustment capacity to 0.
Step 2-8, if beta is less than beta set Repeating steps 2-6 until β=β set The lambda value at the moment is the minimum new energy peak load contribution value lambda meeting the requirement of the system reserve rate min 。
Step 3: based on the peak load contribution rate lambda of the minimum new energy min The adjustment capacity of the system is calculated to be increased to cope with the extreme case.
When the calculated new energy source end condition output is 0, the system causes the insufficient power to be:
P Bneed ＝λ w P W (t)+λ s P S (t) (4)
at this time, t is the time when the maximum power of the system is insufficient.
According to P Bneed The capacity of the regulation of the energy storage or load side response is configured.
The following description is made in connection with specific practical examples:
in this embodiment, the northwest power grid is taken as an example, and the load active power predicted value P corresponding to 8760 hours L (t), predicted value of DC power across region P D (t) initial value of new energy grid-connected scale and active power predicted value sequence P of wind turbine generator W (t) photovoltaic unit active power predicted value sequence P S And (t) adopting actual operation curve data of the northwest power grid in 2020.
And (3) superposing the load curve of each partition, the load reserve, the accident reserve capacity and the direct current output to the load curve to form a comprehensive load curve of the system.
According to the requirements of related standards such as the technical guidelines of the electric power system, in order to ensure reliable power supply, the installed capacity of the power supply should meet the requirement of the system reserve rate after the planned maintenance of the power supply is considered. According to the regulation, the sum of the system load reserve capacity and the accident reserve capacity is 12% -15% of the maximum power generation load of the system, so as to cope with the influence of load fluctuation, load prediction deviation, unit accident overhaul and other uncertainty factors, the actual reserve rate of the northwest power grid is considered according to the fact that the actual reserve rate is not lower than 12%.
Based on an initial planning scheme, a source network load integrated production simulation program (PSD-PEBL) is adopted to carry out production simulation calculation on each region of the northwest power grid.
The installed conditions for each zone of the initial protocol are shown in Table 1, with MW in Table 1.
TABLE 1
| Region(s) | Coal electric power | Gas-electricity | Hydropower | Pumped storage | Wind power generation | Solar energy |
| Shanxi province | 73500 | 20 | 4370 | 1400 | 17440 | 20150 |
| Gansu | 32640 | 10 | 10030 | 0 | 20550 | 15520 |
| (Qinghai) | 5730 | 0 | 16420 | 0 | 12740 | 18740 |
| Ningxia | 34700 | 1150 | 430 | 0 | 14790 | 12830 |
| Xinjiang | 87760 | 540 | 9860 | 1200 | 38010 | 19510 |
| Totalizing | 234330 | 1720 | 41110 | 2600 | 103530 | 86750 |
Setting the initial contribution rate of the peak load of the new energy source as 0, and carrying out production simulation calculation on the initial scheme. According to formula (2), the system is calculated to have insufficient power. The preliminary analysis finds that the system has insufficient electric quantity and mainly exists in Qinghai region and Xinjiang region. From the aspect of regional wind-abandoning and light-abandoning rate, the conventional machine assembly is insufficient in a basic scene, the requirement cannot be met, the thermal power unit 4200MW is increased in the Xinjiang region, the thermal power unit 2640MW is increased in the Qinghai region, the production simulation calculation is carried out again, and the system does not have electric quantity shortage. At this time, the results of the new energy generating capacity, the new energy generating capacity duty ratio and the new energy consumption and utilization rate in each region of the northwest power grid are shown in tables 2-3, and the unit is hundred million kilowatts.
The power shortage calculation is carried out on each region of the northwest power grid, and the 8760-hour power surplus of the northwest power grid is shown in fig. 3.
For each partition, the backup rate of the system was calculated according to equation (3), and the power balance was shown in table 4 at the time when annual power shortage was maximum.
TABLE 2
TABLE 3 Table 3
TABLE 4 Table 4
| Region of | Surplus of electric power (MW) | Actual standby ratio (%) |
| Northwest of China | 16382 | 10.9 |
| Shanxi province | 4808 | 11.9 |
| Gansu | -7941 | -35.3 |
| (Qinghai) | -5372 | -40.9 |
| Ningxia | 1763 | 9.7 |
| Xinjiang | 15665 | 27.9 |
As can be seen from table 4, the actual standby rate of the northwest power grid is 10.9%, and the requirement that the standby rate is not lower than 12% is not satisfied. According to the reserve rate not lower than 12% is considered, the peak load contribution rate lambda of the new energy is regulated, the production simulation calculation is carried out again until the 8760-hour standby rate of the northwest power grid is not lower than 12 percent, and at the moment lambda is calculated min =0.098; the minimum power surplus of the system is 1040MW, and the reserve rate is 12.1%, as shown in fig. 4, so that the northwest power grid can meet the requirement that the reserve rate is not lower than 12% under the condition that the new energy peak load contribution rate lambda is more than 0.098.
Under the condition that the new energy peak load contribution rate is 0.098, according to formula (3), calculating the regulating capacity required to be configured by the northwest power grid as follows:
P Bneed ＝λ w P W (t)+λ s P S (t)＝0.098×(22353+1567)＝2344(MW)
according to the adjustment capacity, if the energy storage is configured, 0.33 is selected according to the reliable power level coefficient of the energy storage replacement configured in the northwest area in the table 5, and according to the measurement and calculation of the 2 hours/daily electric quantity of the energy storage device, the energy storage capacity needs to be configured as follows:
configuration energy storage capacity=2344/0.33×2=7103×2=14206 MWh
TABLE 5
| Region(s) | Northwest of China |
| Maximum substitution coefficient | 0.57 |
| Minimum substitution coefficient | 0.24 |
| Average substitution coefficient | 0.33 |
In table 5, substitution coefficient = capacity of energy storage participation power balance alternative reliable Machine (MW)/energy storage machine capacity (MW);
according to the adjustment capacity, if the load side response is configured, the ratio to be configured is 1.56% as follows.
Load side response ratio = capacity/peak load = 2344/150570 = 1.56%
The invention also provides a system 200 for determining the adjustment capacity by considering the new energy contribution rate of peak load, as shown in fig. 5, comprising:
a scheme determination unit 201 that determines a power system basic planning scheme;
the simulation calculation unit 202 performs production simulation calculation on the power system according to the basic planning scheme, and determines a minimum new energy peak load contribution value meeting preset requirements;
the calculation unit 203 determines, according to the minimum new energy peak load contribution value, that the power system increases the equipped adjustment capacity when an extreme situation occurs in the power system.
The method comprises the steps of determining a basic planning scheme of a power system, wherein the basic planning scheme comprises the following steps:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
according to a load curve and the principle of equal standby capacity, arranging the maintenance of a conventional unit of the power system;
and after the overhaul is completed, determining the target reserve rate and the peak load new energy contribution rate of the power system.
Wherein, the history data specifically is: the method comprises the steps of presetting a load active power predicted value, a cross-region direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine active power predicted value sequence and a photovoltaic turbine active power predicted value sequence of a power system within a time.
The calculation formula of the new energy contribution rate of peak load is as follows:
and the new energy contribution rate of peak load is more than or equal to 0 and less than or equal to 1.
The method for determining the minimum new energy peak load contribution value meeting the preset requirement specifically comprises the following steps:
and (3) carrying out production simulation calculation on the power system, judging whether the power system is insufficient or not, wherein a judgment formula is as follows:
wherein: lambda (lambda) w For the output proportion, lambda of wind power participating in power balance s Taking the initial value of the contribution rate of new energy source of peak load as 0 and P for the output proportion of the photovoltaic participated in the power balance e (t) is the real-time output, P of the conventional unit W (t) is the real-time output and P of the wind turbine generator S (t) is the real-time output and P of the photovoltaic unit B1 (t) is the real-time output and P of the energy storage unit L (t) is the real-time output and P of the load unit D (t) is the real-time output of the DC unit;
if the calculation result is that the electric quantity is insufficient, judging whether an electric power system generates an electric quantity gap, if the electric quantity gap is generated in the load peak time or the load low valley time, adding a conventional unit, and if the electric quantity gap is generated in the load low valley time, adding the start-up of the thermal power unit or adding energy storage until the electric power system cannot generate the condition of insufficient electric quantity;
carrying out production simulation calculation of the power system again within the range of the new energy contribution rate of the peak load, obtaining a production simulation calculation result, judging the system reserve rate of the load peak period according to the production simulation calculation result, and ending the production simulation calculation until the system reserve rate is equal to the target reserve rate;
when the system reserve rate is equal to the target reserve rate, the value of the system reserve rate meets the preset requirement, and the minimum new energy peak load contribution rate value can be determined;
the calculation formula of the system reserve rate is as follows:
wherein P is B2 And (t) increasing the energy storage output when the electric quantity gap is generated in the load valley period.
Wherein, confirm the power system and increase the regulation capacity that is equipped with, specifically:
when the calculated new energy source end condition output is 0, the power deficiency caused by the power system is as follows:
P Bneed ＝λ w P W (t)+λ s P S (t)
P Bneed the capacity is adjusted for the configuration.
The invention can determine the minimum new energy peak load contribution rate and determine the reasonable adjustment capacity required for meeting the fluctuation intermittence of the new energy according to the minimum new energy peak load contribution rate; the invention is applicable to actual large power grids, can ensure that the power balance of the system in a long time scale can meet the requirement of the system on the standby rate, and has great significance for ensuring the safety of the power grids; the index of the invention adopts analytic deduction, and has wider application range and high applicability.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. A method of determining an adjustment capacity taking into account a peak-to-peak new energy contribution rate, the method comprising:
determining a basic planning scheme of the power system;
the basic planning scheme for determining the power system is specifically as follows:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
according to a load curve and the principle of equal standby capacity, arranging the maintenance of a conventional unit of the power system;
after maintenance is completed, determining a target reserve rate and a peak load new energy contribution rate of the power system;
the calculation formula of the peak load new energy contribution rate is as follows:
and the new energy contribution rate of peak load is more than or equal to 0 and less than or equal to 1;
according to the basic planning scheme, carrying out production simulation calculation on the electric power system, and determining a minimum new energy peak load contribution value meeting preset requirements;
the determining of the minimum new energy peak load contribution value meeting the preset requirement specifically comprises the following steps:
and (3) carrying out production simulation calculation on the power system, judging whether the power system is insufficient or not, wherein a judgment formula is as follows:
wherein: lambda (lambda) w For the output proportion, lambda of wind power participating in power balance s Taking the initial value of the contribution rate of new energy source of peak load as 0 and P for the output proportion of the photovoltaic participated in the power balance e (t) is the real-time output, P of the conventional unit W (t) is the real-time output and P of the wind turbine generator S (t) is the real-time output and P of the photovoltaic unit B1 (t) is the real-time output and P of the energy storage unit L (t) is the real-time output and P of the load unit D (t) is the real-time output of the DC unit;
if the calculation result is that the electric quantity is insufficient, judging whether an electric power system generates an electric quantity gap, if the electric quantity gap is generated in the load peak time or the load low valley time, adding a conventional unit, and if the electric quantity gap is generated in the load low valley time, adding the start-up of the thermal power unit or adding energy storage until the electric power system cannot generate the condition of insufficient electric quantity;
carrying out production simulation calculation of the power system again within the range of the new energy contribution rate of the peak load, obtaining a production simulation calculation result, judging the system reserve rate of the load peak period according to the production simulation calculation result, and ending the production simulation calculation until the system reserve rate is equal to the target reserve rate;
when the system reserve rate is equal to the target reserve rate, the value of the system reserve rate meets the preset requirement, and the minimum new energy peak load contribution rate value can be determined;
the calculation formula of the system reserve rate is as follows:
wherein P is B2 (t) increasing the stored energy output when an electrical gap is generated for the load valley period;
and according to the minimum new energy peak load contribution value, determining that the power system increases the equipped regulating capacity when the power system has an extreme condition.
2. The method according to claim 1, the history data being in particular: the method comprises the steps of presetting a load active power predicted value, a cross-region direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine active power predicted value sequence and a photovoltaic turbine active power predicted value sequence of a power system within a time.
3. The method according to claim 1, said determining an adjustment capacity of an electrical power system increase equipment, in particular:
when the calculated new energy source end condition output is 0, the power deficiency caused by the power system is as follows:
P Bneed ＝λ w P W (t)+λ s P S (t)
P Bneed the capacity is adjusted for the configuration.
4. A system for determining an adjustment capacity taking into account peak-to-peak new energy contribution, the system comprising:
a scheme determination unit that determines a basic planning scheme of the power system;
the scheme determining unit is used for determining a basic planning scheme of the power system, and specifically comprises the following steps:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
according to a load curve and the principle of equal standby capacity, arranging the maintenance of a conventional unit of the power system;
after maintenance is completed, determining a target reserve rate and a peak load new energy contribution rate of the power system;
the scheme determining unit determines the calculation formula of the new energy contribution rate of the peak load as follows:
and the new energy contribution rate of peak load is more than or equal to 0 and less than or equal to 1;
the simulation calculation unit is used for carrying out production simulation calculation on the power system according to the basic planning scheme and determining the minimum new energy peak load contribution value meeting the preset requirement;
the simulation calculation unit determines a minimum new energy peak load contribution value meeting preset requirements, and specifically comprises the following steps:
and (3) carrying out production simulation calculation on the power system, judging whether the power system is insufficient or not, wherein a judgment formula is as follows:
wherein: lambda (lambda) w For the output proportion, lambda of wind power participating in power balance s Taking the initial value of the contribution rate of new energy source of peak load as 0 and P for the output proportion of the photovoltaic participated in the power balance e (t) is the real-time output, P of the conventional unit W (t) is the real-time output and P of the wind turbine generator S (t) is the real-time output and P of the photovoltaic unit B1 (t) is the real-time output and P of the energy storage unit L (t) is the real-time output and P of the load unit D (t) is the real-time output of the DC unit;
if the calculation result is that the electric quantity is insufficient, judging whether an electric power system generates an electric quantity gap, if the electric quantity gap is generated in the load peak time or the load low valley time, adding a conventional unit, and if the electric quantity gap is generated in the load low valley time, adding the start-up of the thermal power unit or adding energy storage until the electric power system cannot generate the condition of insufficient electric quantity;
carrying out production simulation calculation of the power system again within the range of the new energy contribution rate of the peak load, obtaining a production simulation calculation result, judging the system reserve rate of the load peak period according to the production simulation calculation result, and ending the production simulation calculation until the system reserve rate is equal to the target reserve rate;
when the system reserve rate is equal to the target reserve rate, the value of the system reserve rate meets the preset requirement, and the minimum new energy peak load contribution rate value can be determined;
the calculation formula of the system reserve rate is as follows:
wherein P is B2 (t) increasing the stored energy output when an electrical gap is generated for the load valley period;
and the calculation unit is used for determining that the power system increases the equipped regulating capacity when the power system has an extreme condition according to the minimum new energy peak load contribution value.
5. The system according to claim 4, wherein the scheme determining unit collects historical data of the power system specifically as: the method comprises the steps of presetting a load active power predicted value, a cross-region direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine active power predicted value sequence and a photovoltaic turbine active power predicted value sequence of a power system within a time.
6. The system according to claim 4, the calculation unit determining an adjustment capacity of an electrical power system increase equipment, in particular:
when the calculated new energy source end condition output is 0, the power deficiency caused by the power system is as follows:
P Bneed ＝λ w P W (t)+λ s P S (t)
P Bneed the capacity is adjusted for the configuration.
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| CN108448646A (en) * | 2018-01-16 | 2018-08-24 | 华北电力大学 | A kind of source net coordination peak regulating method for considering direct current and sending power regulation characteristic outside |
| CN112736961A (en) * | 2020-12-03 | 2021-04-30 | 国网综合能源服务集团有限公司 | Wind and light absorption planning method based on flexible resources |
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| CN108448646A (en) * | 2018-01-16 | 2018-08-24 | 华北电力大学 | A kind of source net coordination peak regulating method for considering direct current and sending power regulation characteristic outside |
| CN112736961A (en) * | 2020-12-03 | 2021-04-30 | 国网综合能源服务集团有限公司 | Wind and light absorption planning method based on flexible resources |
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