CN113890107A - Method and system for determining regulation capacity by considering peak load new energy contribution rate - Google Patents

Method and system for determining regulation capacity by considering peak load new energy contribution rate Download PDF

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CN113890107A
CN113890107A CN202110963070.7A CN202110963070A CN113890107A CN 113890107 A CN113890107 A CN 113890107A CN 202110963070 A CN202110963070 A CN 202110963070A CN 113890107 A CN113890107 A CN 113890107A
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load
new energy
power system
power
peak
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CN113890107B (en
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贺海磊
张彦涛
赵珊珊
吴俊玲
代倩
覃琴
张健
张玉红
田鑫
张栋梁
鉴庆之
李文升
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Economic and Technological Research Institute of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Economic and Technological Research Institute of State Grid Shandong Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—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
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The invention discloses a method and a system for determining regulation capacity by considering peak load new energy contribution rate, and belongs to the technical field of power system planning. The method 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 power system, and determining a minimum new energy peak load contribution value meeting a preset requirement; and 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-to-load contribution value. The method can determine the minimum peak load contribution rate of the new energy, and accordingly determine the reasonable regulating capacity intermittently required by meeting the fluctuation of the new energy; the method is suitable for a practical large power grid, can ensure that the long-time scale power balance of the system can meet the requirement of the system utilization rate, and has great significance for ensuring the safety of the power grid; the index of the invention is derived by analysis, so the invention has wider application range and high applicability.

Description

Method and system for determining regulation capacity by considering peak load new energy contribution rate
Technical Field
The present invention relates to the field of power system planning technologies, and more particularly, to a method and system for determining a regulation capacity in consideration of a peak load new energy contribution rate.
Background
The energy structure of China mainly uses fossil energy, particularly coal, for a long time, the total energy consumption is at the top of the world, and the energy consumption is continuously and rapidly increased, so that the pressure of ecological environmental protection and pollution emission reduction is very prominent, the life and sustainable development of people are seriously influenced, and the energy transformation is vigorously promoted and the energy structure is absolutely necessary to be optimized. With the gradual replacement of fossil energy by renewable energy, a clean, low-carbon and efficient energy system consisting of the renewable energy is realized.
In a future electric power system, the new energy is a main body, specifically, the new energy is an installation and electric quantity main body and a responsibility main body, the active supporting and adjusting capacity and the fault ride-through capacity are obviously enhanced, the technical economy is obviously improved, and the new energy is coordinated with conventional energy and various types of energy storage for development. The new energy is actively supported and participated in adjustment, the intermittent and random fluctuation of the new energy causes the fluctuation of peak regulation demand capacity of the system to be increased, the peak regulation difficulty is increased, and adjustment measures such as large-scale energy storage and multi-energy conversion need to be introduced. Therefore, there is an urgent need to investigate how to determine the adjustment measures that can meet the requirements of the balancing mode of the power system.
Disclosure of Invention
In order to solve the problems, the invention provides a method for determining the regulation capacity by considering the peak load new energy contribution rate, 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 power system, and determining a minimum new energy peak load contribution value meeting a preset requirement;
and 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-to-load contribution value.
Optionally, determining a basic planning scheme of the power system specifically includes:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
arranging the maintenance of the conventional unit of the power system according to the load curve and the equal reserve capacity principle;
and after the maintenance is finished, determining the target standby rate and the peak load new energy contribution rate of the power system.
Optionally, the historical data specifically includes: the method comprises the steps of presetting a load active power predicted value, a cross-district direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine generator active power predicted value sequence and a photovoltaic generator active power predicted value sequence of a power system in time.
Optionally, the calculation formula of the peak load new energy contribution rate is as follows:
Figure BDA0003222965130000021
and the peak load new energy contribution rate is more than or equal to 0 and less than or equal to 1.
Optionally, determining a minimum new energy peak-to-load contribution value meeting a preset requirement specifically includes:
and performing simulation calculation on the production of the power system, and judging whether the power system is insufficient in electric quantity, wherein the judgment formula is as follows:
Figure BDA0003222965130000022
wherein: lambda [ alpha ]wThe ratio of the output of wind power to the balance of electric power, lambdasThe initial value of the peak load new energy contribution rate is 0, P is the output ratio of the photovoltaic participating in the power balancee(t) is the real-time output, P, of the conventional unitW(t) is the real-time output, P of the wind turbineS(t) is the real-time output, P, of the photovoltaic unitB1(t) is the real-time output, P of the energy storage unitL(t) is the real-time output, P of the load unitD(t) is the real-time output of the direct current unit;
if the calculation result is that the electric quantity is insufficient, judging whether the electric power system generates an electric quantity gap or a load valley time, if the electric quantity gap is generated in the load peak time, increasing the installation of a conventional unit, and if the electric quantity gap is generated in the load valley time, increasing the starting or increasing the energy storage of the thermal power unit until the electric power system does not have the condition of insufficient electric quantity;
in the range of the peak load new energy contribution rate, performing production simulation calculation on the power system again to obtain a production simulation calculation result, and judging the system utilization rate at the peak load period according to the production simulation calculation result until the system utilization rate is equal to the target utilization rate to finish the production simulation calculation;
when the system standby rate is equal to the target standby rate, the value of the system standby rate meets the preset requirement, and the minimum new energy peak-to-load contribution value can be determined;
the calculation formula of the system standby rate is as follows:
Figure BDA0003222965130000031
wherein, PB2And (t) is the increased energy storage output when the electric quantity gap is generated in the load valley period.
Optionally, determining the adjustment capacity of the increased equipment of the power system specifically includes:
when the output of the new energy in the extreme case is calculated to be 0, the insufficient power caused by the power system is as follows:
PBneed＝λwPW(t)+λsPS(t)
PBneedis the adjustment capacity that should be configured.
The invention also provides a system for determining the regulation capacity by considering the peak load new energy contribution rate, which comprises the following steps:
the scheme determining unit is used for determining 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 a minimum new energy peak-to-load contribution value meeting the preset requirement;
and the calculating unit is used for determining that the power system increases the allocated regulating capacity when the power system has an extreme condition according to the minimum new energy peak-to-load contribution value.
Optionally, the scheme determining unit is configured to determine a basic planning scheme of the power system, and specifically includes:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
arranging the maintenance of the conventional unit of the power system according to the load curve and the equal reserve capacity principle;
and after the maintenance is finished, determining the target standby rate and the peak load new energy contribution rate of the power system.
Optionally, the scheme determining unit specifically collects historical data of the power system by: the method comprises the steps of presetting a load active power predicted value, a cross-district direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine generator active power predicted value sequence and a photovoltaic generator active power predicted value sequence of a power system in time.
Optionally, the calculation formula of the peak load new energy contribution rate is as follows:
Figure BDA0003222965130000041
and the peak load new energy contribution rate is more than or equal to 0 and less than or equal to 1.
Optionally, the determining, by the analog calculation unit, a minimum new energy peak-to-load contribution value meeting the preset requirement includes:
and performing simulation calculation on the production of the power system, and judging whether the power system is insufficient in electric quantity, wherein the judgment formula is as follows:
Figure BDA0003222965130000042
wherein: lambda [ alpha ]wThe ratio of the output of wind power to the balance of electric power, lambdasThe initial value of the peak load new energy contribution rate is 0, P is the output ratio of the photovoltaic participating in the power balancee(t) is the real-time output, P, of the conventional unitW(t) is the real-time output, P of the wind turbineS(t) is the real-time output, P, of the photovoltaic unitB1(t) is the real-time output, P of the energy storage unitL(t) is the real-time output, P of the load unitD(t) is the real-time output of the direct current unit;
if the calculation result is that the electric quantity is insufficient, judging whether the electric power system generates an electric quantity gap or a load valley time, if the electric quantity gap is generated in the load peak time, increasing the installation of a conventional unit, and if the electric quantity gap is generated in the load valley time, increasing the starting or increasing the energy storage of the thermal power unit until the electric power system does not have the condition of insufficient electric quantity;
in the range of the peak load new energy contribution rate, performing production simulation calculation on the power system again to obtain a production simulation calculation result, and judging the system utilization rate at the peak load period according to the production simulation calculation result until the system utilization rate is equal to the target utilization rate to finish the production simulation calculation;
when the system standby rate is equal to the target standby rate, the value of the system standby rate meets the preset requirement, and the minimum new energy peak-to-load contribution value can be determined;
the calculation formula of the system standby rate is as follows:
Figure BDA0003222965130000043
wherein, PB2And (t) is the increased energy storage output when the electric quantity gap is generated in the load valley period.
Optionally, the calculating unit determines the adjustment capacity additionally provided by the power system, specifically:
when the output of the new energy in the extreme case is calculated to be 0, the insufficient power caused by the power system is as follows:
PBneed＝λwPW(t)+λsPS(t)
PBneedis the adjustment capacity that should be configured.
The method can determine the minimum peak load contribution rate of the new energy, and accordingly determine the reasonable regulating capacity intermittently required by meeting the fluctuation of the new energy; the method is suitable for a practical large power grid, can ensure that the long-time scale power balance of the system can meet the requirement of the system utilization rate, and has great significance for ensuring the safety of the power grid; the index of the invention is derived by analysis, so the invention 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 the power surplus of the northwest grid year 8760 hours when the initial contribution of the peak load of the new energy is 0 in the embodiment of the method of the present invention;
FIG. 4 is a graph of the power surplus of the northwest grid year 8760 hours when new energy participates in peak shaving in the embodiment of the method of the present 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 embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present 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, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those 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:
step 1: and determining a basic planning scheme of the power system, wherein the basic planning scheme comprises system load capacity, direct current capacity, installed capacities of various power supplies, a new energy output curve, a direct current power curve, system standby rate requirements and the like.
Step 2: minimum new energy peak-to-load contribution value lambda satisfying standby rate constraint is calculated based on production simulationmin。
And step 3: based on minimum new energy peak-to-charge contribution rate lambdaminThe system is calculated to require increased provisioned capacity to cope with extreme conditions.
As shown in fig. 2, wherein, step 1: determining a basic planning scheme of an electric power system, wherein the basic planning scheme comprises system load capacity, direct current capacity, installed capacity of various power supplies, a new energy output curve, a direct current power curve, system standby rate requirements and the like, and the basic planning scheme specifically comprises the following steps:
collecting and processing data;
according to historical data, collecting a load active power predicted value, a cross-district direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine generator active power predicted value sequence and a photovoltaic generator active power predicted value sequence which correspond to 8760 hours continuously, and superposing a load curve, load reserve, accident reserve capacity and direct current output of each subarea to a load curve to form a system comprehensive load curve.
Maintenance and arrangement of the machine set;
and arranging the maintenance of the conventional unit according to the principle of equal reserve capacity.
Determining a target utilization beta of a systemset；
Determining the new energy peak-to-charge contribution ratio lambda, wherein the new energy peak-to-charge contribution ratio lambda refers to the proportion of the actual output of the new energy participating in balance at the peak-to-charge moment to the actual output of the new energy peak-to-charge, namely:
Figure BDA0003222965130000061
the output of the new energy participating in peak shaving 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 [ alpha ]wThe ratio of the output of wind power to the balance of electric power, lambdasThe output proportion of the photovoltaic participating in the power balance.
Step 2: calculating a minimum new energy peak-to-load contribution value meeting a standby rate constraint based on production simulation;
step 2-1, setting the initial contribution rate of the new energy peak load to be 0;
step 2-2, carrying out production simulation calculation;
step 2-3, judging whether the system has insufficient electric quantity ELOLThe calculation formula of the insufficient electric quantity is shown as the formula (2).
Figure BDA0003222965130000062
Wherein: pe(t)、PW(t)、PS(t)、PB1(t)、PL(t)、PDAnd (t) the real-time output of a conventional unit, wind power, photovoltaic, energy storage, load and direct current are respectively.
Step 2-4, if the system has insufficient electric quantity, judging whether an electric quantity gap generated by the system is in a load peak period or a load valley period, and if the electric quantity gap generated by the system is in the load peak period, increasing conventional unit installation; if the load is in a low-ebb period to generate an electric quantity gap, measures such as increasing the starting of the thermal power generating unit or increasing the energy storage are adopted, and the increased energy storage capacity is recorded as PB2。
And 2-5, repeating the steps 2-2 to 2-4 until the system has no electric quantity shortage.
And 2-6, arbitrarily setting the new energy peak-to-load contribution rate lambda between 0 and 1, carrying out production simulation calculation again, and judging whether the standby rate of the system can meet the requirement at the peak load period according to the production simulation result. The calculation formula of the real-time backup rate β is shown in formula (3), and the backup rate at this time can be recorded as β.
Figure BDA0003222965130000071
Step 2-7, if beta is more than or equal to betasetThen, the whole process is ended, and the system needs to increase the allocated adjusting capacity to 0.
Step 2-8, if beta is less than betasetRepeating steps 2-6 until β ═ βsetThe lambda value at the moment is the minimum new energy peak-to-load contribution value lambda meeting the requirement of the system standby ratemin。
And step 3: based on minimum new energy peak-to-charge contribution rate lambdaminThe system is calculated to require increased provisioned capacity to cope with extreme conditions.
When the output of the new energy in the extreme case is calculated to be 0, the insufficient power caused by the system is as follows:
PBneed＝λwPW(t)+λsPS(t) (4)
t at this time is the time when the maximum power of the system is insufficient.
According to PBneedThe adjustment capacity of the energy storage or load side response is configured.
The following description is given by combining specific practical examples:
in the embodiment, taking the northwest power grid as an example, the load active power predicted value P corresponding to 8760 hoursL(t) cross-region direct current power predicted value PD(t), a new energy grid-connected scale initial value and a wind turbine active power predicted value sequence PW(t) the sequence P of the predicted values of the active power of the photovoltaic unitSAnd (t) adopting the actual operation curve data of the northwest power grid in 2020.
And (4) superposing the load curve, the load reserve, the accident reserve capacity and the direct current output of each subarea to the load curve to form a system comprehensive load curve.
According to the requirements of relevant standards such as 'technical guide of electric power system' and the like, in order to guarantee reliable supply of electric power, after considering planned maintenance of a power supply, the installed capacity of the power supply should meet the requirement of the system spare rate. 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 deal with the influence of uncertain factors such as load fluctuation, load prediction deviation and unit accident maintenance, and the actual reserve rate of the northwest power grid is considered according to the condition that the reserve rate is not lower than 12%.
Based on the 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.
Initial protocol the installation conditions for each area are shown in table 1, where the unit is MW in table 1.
TABLE 1
Region(s) Coal power Gas electricity Water and electricity Pumped storage Wind power generation Solar energy
Shaanxi 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
Total up to 234330 1720 41110 2600 103530 86750
And setting the initial contribution rate of the new energy peak load to be 0, and carrying out production simulation calculation on the initial scheme. And (4) calculating the power shortage of the system according to the formula (2). Preliminary analysis finds that the system has insufficient electric quantity, and mainly exists in Qinghai areas and Xinjiang areas. From regional wind and light abandoning rate, conventional units are installed insufficiently and cannot meet the requirements under the basic scene, a thermal power unit 4200MW is added to the Xinjiang region, a thermal power unit 2640MW is added to the Qinghai region, production simulation calculation is carried out again, and the system is not insufficient in electric quantity. At the moment, the results of the new energy generating capacity, the new energy generating capacity ratio and the new energy consumption utilization rate of each region of the northwest power grid are shown in tables 2-3, and the unit is hundred million kilowatts.
And (3) carrying out power shortage calculation on each area of the northwest power grid, wherein the power surplus of the northwest power grid in 8760 hours is shown in figure 3.
For each partition, the system reserve rate is calculated according to equation (3), and the power balance is shown in table 4 at the time when the annual power shortage is maximum.
TABLE 2
Figure BDA0003222965130000081
Figure BDA0003222965130000091
TABLE 3
Figure BDA0003222965130000092
TABLE 4
Region of land Surplus power (MW) Actual spare ratio (%)
Northwest of China 16382 10.9
Shaanxi 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 utilization ratio of the northwest grid is 10.9%, and the requirement that the utilization ratio is not lower than 12% is not satisfied. Considering according to the fact that the standby rate is not lower than 12%, adjusting the new energy peak load contribution rate lambda, and carrying out production simulation calculation again until the standby rate of the northwest power grid is not lower than 12% in 8760 hours, wherein lambda at the momentmin0.098; the minimum surplus power of the system is 1040MW, the reserve rate is 12.1%, as shown in fig. 4, so that the northwest grid can meet the requirement that the reserve rate is not lower than 12% when the new energy peak load contribution rate λ is greater than 0.098.
Under the condition that the new energy peak load contribution rate is 0.098, calculating the required configured regulation capacity of the northwest power grid according to a formula (3) as follows:
PBneed＝λwPW(t)+λsPS(t)＝0.098×(22353+1567)＝2344(MW)
according to the capacity adjustment, if energy storage is configured, 0.33 is selected according to the coefficient of the northwest region configuration energy storage substitution reliable power level in the table 5, and according to the measurement and calculation of 2 hours/day electric quantity of the energy storage equipment, the required configuration energy storage capacity is as follows:
the energy storage capacity is 2344/0.33 × 2 ═ 7103 × 2 ═ 14206MWh
TABLE 5
Region(s) Northwest of China
Maximum substitution coefficient 0.57
Minimum substitution coefficient 0.24
Mean substitution coefficient 0.33
In table 5, the substitution coefficient (MW)/the capacity (MW) of the energy storage device, which can replace the reliable installation, is participated in the power balance;
according to the adjustment capacity, if the load side response is configured, the ratio of the required configuration is 1.56% as follows.
Load side response ratio regulating capacity/peak load 2344/150570 ═ 1.56%
The present invention also proposes a system 200 for determining an adjusted capacity taking into account peak-to-load new energy contribution rate, as shown in fig. 5, comprising:
a scheme determination unit 201, which determines a basic planning scheme of the power system;
the simulation calculation unit 202 is used for performing production simulation calculation on the power system according to the basic planning scheme and determining a minimum new energy peak-to-load contribution value meeting a preset requirement;
and the calculating unit 203 determines that the power system increases the allocated regulating capacity when the power system has an extreme condition according to the minimum new energy peak-to-load contribution value.
The method comprises the following steps of 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;
arranging the maintenance of the conventional unit of the power system according to the load curve and the equal reserve capacity principle;
and after the maintenance is finished, determining the target standby rate and the peak load new energy contribution rate of the power system.
The historical data specifically comprises the following data: the method comprises the steps of presetting a load active power predicted value, a cross-district direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine generator active power predicted value sequence and a photovoltaic generator active power predicted value sequence of a power system in time.
The calculation formula of the peak load new energy contribution rate is as follows:
Figure BDA0003222965130000101
and the peak load new energy contribution rate is more than or equal to 0 and less than or equal to 1.
The method comprises the following steps of determining a minimum new energy peak-to-load contribution value meeting a preset requirement, wherein the minimum new energy peak-to-load contribution value meeting the preset requirement specifically comprises the following steps:
and performing simulation calculation on the production of the power system, and judging whether the power system is insufficient in electric quantity, wherein the judgment formula is as follows:
Figure BDA0003222965130000111
wherein: lambda [ alpha ]wThe ratio of the output of wind power to the balance of electric power, lambdasThe initial value of the peak load new energy contribution rate is 0 DEG P for the output proportion of the photovoltaic participating in the power balancee(t) is the real-time output, P, of the conventional unitW(t) is the real-time output, P of the wind turbineS(t) is the real-time output, P, of the photovoltaic unitB1(t) is the real-time output, P of the energy storage unitL(t) is the real-time output, P of the load unitD(t) is the real-time output of the direct current unit;
if the calculation result is that the electric quantity is insufficient, judging whether the electric power system generates an electric quantity gap or a load valley time, if the electric quantity gap is generated in the load peak time, increasing the installation of a conventional unit, and if the electric quantity gap is generated in the load valley time, increasing the starting or increasing the energy storage of the thermal power unit until the electric power system does not have the condition of insufficient electric quantity;
in the range of the peak load new energy contribution rate, performing production simulation calculation on the power system again to obtain a production simulation calculation result, and judging the system utilization rate at the peak load period according to the production simulation calculation result until the system utilization rate is equal to the target utilization rate to finish the production simulation calculation;
when the system standby rate is equal to the target standby rate, the value of the system standby rate meets the preset requirement, and the minimum new energy peak-to-load contribution value can be determined;
the calculation formula of the system standby rate is as follows:
Figure BDA0003222965130000112
wherein, PB2And (t) is the increased energy storage output when the electric quantity gap is generated in the load valley period.
The method comprises the following steps of determining the adjusting capacity additionally provided by the power system, specifically:
when the output of the new energy in the extreme case is calculated to be 0, the insufficient power caused by the power system is as follows:
PBneed＝λwPW(t)+λsPS(t)
PBneedis the adjustment capacity that should be configured.
The method can determine the minimum peak load contribution rate of the new energy, and accordingly determine the reasonable regulating capacity intermittently required by meeting the fluctuation of the new energy; the method is suitable for a practical large power grid, can ensure that the long-time scale power balance of the system can meet the requirement of the system utilization rate, and has great significance for ensuring the safety of the power grid; the index of the invention is derived by analysis, so the invention has wider application range and high applicability.
As will be appreciated by one skilled in the art, 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 and transliterated scripting language JavaScript.
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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A method of determining a modulation capacity taking into account peak-to-charge new energy contribution rate, the method comprising:
determining a basic planning scheme of the power system;
according to the basic planning scheme, carrying out production simulation calculation on the power system, and determining a minimum new energy peak load contribution value meeting a preset requirement;
and 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-to-load contribution value.
2. The method according to claim 1, wherein the determining of the basic planning scheme of the power system comprises:
collecting historical data of the power system, and determining a comprehensive load curve of the system according to the historical data;
arranging the maintenance of the conventional unit of the power system according to the load curve and the equal reserve capacity principle;
and after the maintenance is finished, determining the target standby rate and the peak load new energy contribution rate of the power system.
3. The method of claim 2, wherein the historical data is specifically: the method comprises the steps of presetting a load active power predicted value, a cross-district direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine generator active power predicted value sequence and a photovoltaic generator active power predicted value sequence of a power system in time.
4. The method of claim 2, wherein the peak-to-load new energy contribution rate is calculated as follows:
Figure FDA0003222965120000011
and the peak load new energy contribution rate is more than or equal to 0 and less than or equal to 1.
5. The method according to claim 1, wherein the determining a minimum new energy peak-to-load contribution value that meets a preset requirement specifically comprises:
and performing simulation calculation on the production of the power system, and judging whether the power system is insufficient in electric quantity, wherein the judgment formula is as follows:
Figure FDA0003222965120000012
wherein: lambda [ alpha ]wThe ratio of the output of wind power to the balance of electric power, lambdasThe initial value of the peak load new energy contribution rate is 0, P is the output ratio of the photovoltaic participating in the power balancee(t) is the real-time output, P, of the conventional unitW(t) is the real-time output, P of the wind turbineS(t) is the real-time output, P, of the photovoltaic unitB1(t) is the real-time output, P of the energy storage unitL(t) is the real-time output, P of the load unitD(t) is the real-time output of the direct current unit;
if the calculation result is that the electric quantity is insufficient, judging whether the electric power system generates an electric quantity gap or a load valley time, if the electric quantity gap is generated in the load peak time, increasing the installation of a conventional unit, and if the electric quantity gap is generated in the load valley time, increasing the starting or increasing the energy storage of the thermal power unit until the electric power system does not have the condition of insufficient electric quantity;
in the range of the peak load new energy contribution rate, performing production simulation calculation on the power system again to obtain a production simulation calculation result, and judging the system utilization rate at the peak load period according to the production simulation calculation result until the system utilization rate is equal to the target utilization rate to finish the production simulation calculation;
when the system standby rate is equal to the target standby rate, the value of the system standby rate meets the preset requirement, and the minimum new energy peak-to-load contribution value can be determined;
the calculation formula of the system standby rate is as follows:
Figure FDA0003222965120000021
wherein, PB2And (t) is the increased energy storage output when the electric quantity gap is generated in the load valley period.
6. The method according to claim 1, wherein the determining of the increased provided regulation capacity of the power system is:
when the output of the new energy in the extreme case is calculated to be 0, the insufficient power caused by the power system is as follows:
PBneed＝λwPW(t)+λsPS(t)
PBneedis the adjustment capacity that should be configured.
7. A system for determining a turndown capacity in consideration of peak-to-load new energy contribution rate, the system comprising:
the scheme determining unit is used for determining 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 a minimum new energy peak-to-load contribution value meeting the preset requirement;
and the calculating unit is used for determining that the power system increases the allocated regulating capacity when the power system has an extreme condition according to the minimum new energy peak-to-load contribution value.
8. The system according to claim 7, wherein the plan determining unit is configured to determine a basic planning plan 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;
arranging the maintenance of the conventional unit of the power system according to the load curve and the equal reserve capacity principle;
and after the maintenance is finished, determining the target standby rate and the peak load new energy contribution rate of the power system.
9. The system according to claim 8, wherein the schedule determining unit collects historical data of the power system by: the method comprises the steps of presetting a load active power predicted value, a cross-district direct current power predicted value, a new energy grid-connected scale initial value, a wind turbine generator active power predicted value sequence and a photovoltaic generator active power predicted value sequence of a power system in time.
10. The system according to claim 8, wherein the schedule determination unit determines a peak-to-load new energy contribution rate by the following calculation formula:
Figure FDA0003222965120000031
and the peak load new energy contribution rate is more than or equal to 0 and less than or equal to 1.
11. The system according to claim 7, wherein the simulation calculating unit determines a minimum new energy peak-to-load contribution value that meets a preset requirement, and specifically includes:
and performing simulation calculation on the production of the power system, and judging whether the power system is insufficient in electric quantity, wherein the judgment formula is as follows:
Figure FDA0003222965120000032
wherein: lambda [ alpha ]wThe ratio of the output of wind power to the balance of electric power, lambdasThe initial value of the peak load new energy contribution rate is 0, P is the output ratio of the photovoltaic participating in the power balancee(t) is the real-time output, P, of the conventional unitW(t) is the real-time output, P of the wind turbineS(t) is the real-time output, P, of the photovoltaic unitB1(t) is the real-time output, P of the energy storage unitL(t) is the real-time output, P of the load unitD(t) is the real-time output of the direct current unit;
if the calculation result is that the electric quantity is insufficient, judging whether the electric power system generates an electric quantity gap or a load valley time, if the electric quantity gap is generated in the load peak time, increasing the installation of a conventional unit, and if the electric quantity gap is generated in the load valley time, increasing the starting or increasing the energy storage of the thermal power unit until the electric power system does not have the condition of insufficient electric quantity;
in the range of the peak load new energy contribution rate, performing production simulation calculation on the power system again to obtain a production simulation calculation result, and judging the system utilization rate at the peak load period according to the production simulation calculation result until the system utilization rate is equal to the target utilization rate to finish the production simulation calculation;
when the system standby rate is equal to the target standby rate, the value of the system standby rate meets the preset requirement, and the minimum new energy peak-to-load contribution value can be determined;
the calculation formula of the system standby rate is as follows:
Figure FDA0003222965120000041
wherein, PB2And (t) is the increased energy storage output when the electric quantity gap is generated in the load valley period.
12. The system according to claim 7, wherein the computing unit determines the capacity of the power system to be increased with a regulation, in particular:
when the output of the new energy in the extreme case is calculated to be 0, the insufficient power caused by the power system is as follows:
PBneed＝λwPW(t)+λsPS(t)
PBneedis the adjustment capacity that should be configured.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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