CN112688369A - Multi-source coordination control method and system for comprehensive energy system - Google Patents

Multi-source coordination control method and system for comprehensive energy system Download PDF

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Publication number
CN112688369A
CN112688369A CN202110033046.3A CN202110033046A CN112688369A CN 112688369 A CN112688369 A CN 112688369A CN 202110033046 A CN202110033046 A CN 202110033046A CN 112688369 A CN112688369 A CN 112688369A
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power
load
energy system
power supply
shortage
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Inventor
丁保迪
寇凌峰
季宇
屈小云
吴鸣
牛耕
张颖
庞成明
刘晓娟
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China Online Shanghai Energy Internet Research Institute Co ltd
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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China Online Shanghai Energy Internet Research Institute Co ltd
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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Abstract

The invention discloses a multi-source coordination control method and system for an integrated energy system, and belongs to the technical field of smart power grids. The method comprises the following steps: determining that the operating state is in a power imbalance state; determining the current output and output margin of an energy storage unit in the comprehensive energy system, wherein the current output and output margin can not adjust the power to a balance state; acquiring forward and reverse deviations allowed by power shortage; determining the power range of a switchable load or power supply of the comprehensive energy system; and completing multi-source coordination control of the comprehensive energy system according to the power range of the switchable load or power supply. The invention solves the problems of certain over-cut, insufficient flexibility and the like of the existing load shedding method, can effectively reduce the over-cut amount of the system, improves the economy of load control, and simultaneously avoids the influence of frequent switching of the load or the power supply on the stability of the system.

Description

Multi-source coordination control method and system for comprehensive energy system
Technical Field
The invention relates to the technical field of smart power grids, in particular to a multi-source coordination control method and system for an integrated energy system.
Background
The method is characterized in that a micro-grid technology is used as a carrier, a multi-source coordinated comprehensive energy system is constructed as a feasible mode of a future small-sized energy system, during the operation period of a system island, the distributed generation output inside a micro-grid can change along with the change of external environments (such as sunlight intensity, wind power and weather conditions), so that the voltage fluctuation inside a direct-current micro-grid is very large, the change condition of the voltage inside the direct-current micro-grid needs to be monitored at any time, and measures are taken to cope with the influence on the safety and stability of the micro-grid caused by the sudden change of internal power or load power.
According to the conventional power coordination control scheme, loads or power supplies are switched in a grading mode according to the current power shortage condition, and the loads or power supplies in the unified grade are sequentially switched according to the size or other sequences. The power coordination control strategies are easy to cause load or power source over-cut situations, and meanwhile, the frequent switching of the load or the power source can cause great disturbance to a direct current system.
Disclosure of Invention
In order to solve the above problems, the present invention provides a multi-source coordination control method for an integrated energy system, including:
judging the running state of the current comprehensive energy system, and determining that the running state is in a power imbalance state;
determining the current output and output margin of the comprehensive energy system, wherein the current output and output margin can not adjust the power to a balance state;
calculating the power shortage of the comprehensive energy system according to the current output and the output margin if the output meets the set conditions, and acquiring the forward deviation and the reverse deviation allowed by the power shortage according to the upper limit and the lower limit allowed by the voltage deviation;
acquiring upper and lower limits of the power shortage according to the forward and reverse deviations allowed by the power shortage, and determining the power range of the switched load or power supply of the comprehensive energy system according to the upper and lower limits of the power shortage;
and completing multi-source coordination control of the comprehensive energy system according to the power range of the switchable load or power supply.
Optionally, the determining the operation state of the current integrated energy system includes:
acquiring the power shortage of the comprehensive energy system at any moment;
if the power shortage is greater than 0, the comprehensive energy system needs to cut load or switch on a power supply;
if the power shortage is less than 0, the integrated energy system needs to load or power off.
Optionally, the multi-source coordination control of the integrated energy system is completed according to a power range of a switchable load or a power supply, including:
the load or the power supply is classified according to the importance degree or the operation characteristic, the load or the power supply in the same grade is sequenced according to the power, the load or the power supply is switched step by step according to the screening logic, the total amount of the switched load or the switched power supply is in the range of the power shortage, the output of the energy storage unit is adjusted, and the power shortage is supplemented by switching the load or the power supply.
The invention also provides a multi-source coordination control system for the comprehensive energy system, which comprises the following components:
the judging module is used for judging the running state of the current comprehensive energy system and determining that the running state is in a power imbalance state;
the first calculation module is used for determining the current output and output margin of the comprehensive energy system, and the current output and output margin can not adjust the power to a balance state;
the second calculation module is used for calculating the power shortage of the comprehensive energy system according to the current output and the output margin and acquiring the forward deviation and the reverse deviation allowed by the power shortage according to the upper limit and the lower limit allowed by the voltage deviation if the output meets the set condition;
the third calculation module is used for acquiring upper and lower limits of the power shortage according to the forward and reverse deviations allowed by the power shortage, and determining the power range of the comprehensive energy system in which the load or the power supply can be switched according to the upper and lower limits of the power shortage;
and the control module is used for finishing multi-source coordination control of the comprehensive energy system according to the power range of the switchable load or power supply.
Optionally, the judging module judges the operating state of the current integrated energy system, and includes:
acquiring the power shortage of the comprehensive energy system at any moment;
if the power shortage is greater than 0, the comprehensive energy system needs to cut load or switch on a power supply;
if the power shortage is less than 0, the integrated energy system needs to load or power off.
Optionally, the control module completes multi-source coordination control of the integrated energy system according to a power range of a switchable load or a power supply, including:
the load or the power supply is classified according to the importance degree or the operation characteristic, the load or the power supply in the same grade is sequenced according to the power, the load or the power supply is switched step by step according to the screening logic, the total amount of the switched load or the switched power supply is in the range of the power shortage, the output of the energy storage unit is adjusted, and the power shortage is supplemented by switching the load or the power supply.
The method comprises the steps of firstly, considering the current output and the maximum output of each energy storage in the system, initially trying to stabilize voltage deviation, then, determining the upper limit and the lower limit of a switching load or a power supply by combining the voltage upper limit of the stable operation of the system, secondly, switching the load or the power supply in sequence by screening logic according to the upper limit and the lower limit of the switching load or the power supply so as to avoid the load or the power supply from being switched excessively, and finally, meeting the requirement of power coordination control by adjusting the output of the energy storage.
Drawings
FIG. 1 is a flow chart of a multi-source coordination control method for an integrated energy system according to the present invention;
fig. 2 is a structural diagram of a multi-source coordination control system for an integrated energy system according to 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.
In view of the above problems, the present invention provides a multi-source coordination control method for an integrated energy system, as shown in fig. 1, including:
acquiring the power shortage of the comprehensive energy system at any moment, judging the running state of the current comprehensive energy system according to the power shortage, and determining that the running state is in a power unbalance state;
determining the current output and output margin of an energy storage unit in the comprehensive energy system, wherein the current output and output margin can not adjust the power to a balance state;
calculating the power shortage of the comprehensive energy system if the output of the energy storage unit is 0, and acquiring the forward deviation and the reverse deviation allowed by the power shortage according to the upper limit and the lower limit allowed by the voltage deviation;
acquiring upper and lower limits of the power shortage according to the forward and reverse deviations allowed by the power shortage, and determining the power range of the switched load or power supply of the comprehensive energy system according to the upper and lower limits of the power shortage;
and completing multi-source coordination control of the comprehensive energy system according to the power range of the switchable load or power supply.
Judging the running state of the current comprehensive energy system according to the power shortage, comprising the following steps:
if the power shortage is greater than 0, the comprehensive energy system needs to cut load or switch on a power supply;
if the power shortage is less than 0, the integrated energy system needs to load or power off.
According to the power range of the switchable load or power supply, the multi-source coordination control of the comprehensive energy system is completed, and the method comprises the following steps:
the load or the power supply is classified according to the importance degree or the operation characteristic, the load or the power supply in the same grade is sequenced according to the power, the load or the power supply is switched step by step according to the screening logic, the total amount of the switched load or the switched power supply is in the range of the power shortage, the output of the energy storage unit is adjusted, and the power shortage is supplemented by switching the load or the power supply.
The invention is further illustrated by the following examples:
calculating the P-U droop control coefficient of the load;
in a simplified P-U response model of a direct current system, the P-U droop control coefficient of a load is as follows:
Figure BDA0002892199330000051
let Δ P denote the surplus generated power and Δ U denote the increased voltage, then:
Figure BDA0002892199330000052
in the formula of U(0)Is the present voltage, U(1)Is a target voltage;
calculating power shortage by taking the bus voltage stability as a target;
the power shortage at a certain moment during island operation is PqeAnd then:
Figure BDA0002892199330000053
this is obtained from the formula (1.2):
Figure BDA0002892199330000054
a power coordination control strategy when the power shortage is more than or equal to 0;
calculating the current active output P of the energy storage deviceSΣAnd a maximum active power output PSMComprises the following steps:
Figure BDA0002892199330000055
in the formula PsiThe active power output of the energy storage device i is a positive value in a discharging state and a negative value in a charging state;
if P isqe+PSΣLess than or equal to 0, indicating that the energy storage device is in a charging state and the charging work isWhen the rate is greater than the power shortage, the charging power of the energy storage device is reduced, and the output of the energy storage device is adjusted to be P'S∑And if not, adjusting the active power of the energy storage device to be 0, and recalculating the power shortage PqeNamely:
Figure BDA0002892199330000061
from the formula (1.3), the upper limit U of the allowable voltage is determinedmaxSum voltage UminThe allowed forward and reverse offsets of the power deficit can be calculated, i.e.:
Figure BDA0002892199330000062
the range of non-significant (two-level, three-level) load is cut off by calculation, i.e.:
Figure BDA0002892199330000063
the non-significant (secondary, tertiary) loads were cut.
Firstly cutting off the load with low important grade, and then cutting off the load with high important grade; for the loads of the same important class, the loads are cut off according to the order of the power from large to small, and when the power value of a certain load is checked
Figure BDA0002892199330000064
Then, without cutting it, the next load is checked; when the power value of a certain load is detected to satisfy
Figure BDA0002892199330000065
When it is detected that the power value of a certain load satisfies the requirement, it is cut off and then the next load is checked
Figure BDA0002892199330000066
It is cut off and the following load is no longer checked. At the time of cutting off the load iThen, the power shortage is recalculated according to the formula (1.8), the range of the non-important load is recalculated according to the formula (1.7), and then the next load is checked, namely:
P′qe＝Pqe-Pqe-i (1.8)
in the formula Pqe-iCutting off the active power of the load;
after all appropriate non-critical loads have been removed, if-PSM≤P≤PSMThe power shortage after load shedding, i.e. P, is supplemented by adjusting the stored energy outputSΣ＝PqeAnd then ends the control operation. Otherwise, the range of the cut-off important (primary) load amount is calculated, namely:
Figure BDA0002892199330000067
and cutting off important loads in the order of power from high to low. When the power value of a certain load is checked, the load is checked without cutting off the load, and when the power value of a certain load is checked to meet the requirement
Figure BDA0002892199330000071
When it is detected that the power of a load satisfies the requirement, it is cut off and then the next load is checked
Figure BDA0002892199330000072
And then cutting off the load and not checking the subsequent load, after cutting off the load i, recalculating the power shortage according to the formula (1.8), recalculating the range of cutting off the important load according to the formula (1.9), and then checking the next load.
Supplementing all power deficit after switching off, i.e. P, by regulating the stored energy outputSΣ＝Pqe；
When the power shortage is less than 0, the power coordination control strategy needs to be realized by cutting off the power supply;
calculating the current active output and the maximum active output of the energy storage device according to the formula (1.4);
if-PSM<Pyy-PSΣ<PSMThe excess power after load shedding is supplemented by regulating the stored energy output, i.e. the stored energy output is regulated to P'S∑＝Pyy-PSΣThen ending the control operation, otherwise executing the next step;
the allowable forward and reverse deviations of the power surplus can be calculated according to the allowable upper and lower voltage limits, namely:
Figure BDA0002892199330000073
if the energy storage device is in a discharged state (P)SΣ>0) Setting the discharge power of the energy storage device to be 0, and recalculating the power surplus;
Figure BDA0002892199330000074
the range for calculating the cut power generation amount is as follows:
Figure BDA0002892199330000075
according to the arrangement of the power from large to small, the power supply with large power is cut off first, and then the power supply with small power is cut off. When the power value P of a certain power supply is checkedGi>Pqj-maxWhen the power supply is not cut off, the next power supply is checked; when the power value of a certain power supply is checked to meet PGi<Pqj-maxWhen it is needed, it is cut off and then the next power supply is checked; when the power value of a certain power supply is checked to meet Pqj-min≤PGi≤Pqj-maxWhen the power supply is cut off, the power shortage is recalculated according to the formula (1.13) after the power supply i is cut off, and then the range of the cutting power generation amount is recalculated according to the formula (1.12), and then the next power supply is checked, namely:
P′yy＝Pyy-PGqc-i (1.13)
in the formula, PGqc-iThe active power for the cut-off power generation.
Supplementing the surplus of power after all suitable power sources are cut off, i.e. P, by adjusting the stored energy outputSΣ＝-PyyAnd accurate control of power coordination is realized.
The present invention further provides a multi-source coordination control system 200 for an integrated energy system, as shown in fig. 2, including:
the judging module 201 is used for acquiring the power shortage of the comprehensive energy system at any moment, judging the running state of the current comprehensive energy system according to the power shortage, and determining that the running state is in a power imbalance state;
the first calculation module 202 is used for determining the current output and output margin of an energy storage unit in the comprehensive energy system, and the current output and output margin cannot adjust the power to a balanced state;
the second calculating module 203 calculates the power shortage of the comprehensive energy system if the output of the energy storage unit is 0, and obtains the allowed forward deviation and the allowed reverse deviation of the power shortage according to the upper limit and the lower limit of the voltage deviation;
the third calculation module 204 is used for acquiring upper and lower limits of the power shortage according to the forward and reverse deviations allowed by the power shortage, and determining the power range of the load or power source which can be switched by the comprehensive energy system according to the upper and lower limits of the power shortage;
and the control module 205 completes multi-source coordination control of the comprehensive energy system according to the power range of the switchable load or power supply.
Judging the running state of the current comprehensive energy system according to the power shortage, comprising the following steps:
if the power shortage is greater than 0, the comprehensive energy system needs to cut load or switch on a power supply;
if the power shortage is less than 0, the integrated energy system needs to load or power off.
According to the power range of the switchable load or power supply, the multi-source coordination control of the comprehensive energy system is completed, and the method comprises the following steps:
the load or the power supply is classified according to the importance degree or the operation characteristic, the load or the power supply in the same grade is sequenced according to the power, the load or the power supply is switched step by step according to the screening logic, the total amount of the switched load or the switched power supply is in the range of the power shortage, the output of the energy storage unit is adjusted, and the power shortage is supplemented by switching the load or the power supply.
The method comprises the steps of firstly, considering the current output and the maximum output of each energy storage in the system, initially trying to stabilize voltage deviation, then, determining the upper limit and the lower limit of a switching load or a power supply by combining the voltage upper limit of the stable operation of the system, secondly, switching the load or the power supply in sequence by screening logic according to the upper limit and the lower limit of the switching load or the power supply so as to avoid the load or the power supply from being switched excessively, and finally, meeting the requirement of power coordination control by adjusting the output of the energy storage.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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 the preferred embodiments of the present application 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 alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (6)

1. A method for multi-source coordinated control of an integrated energy system, the method comprising:
judging the running state of the current comprehensive energy system, and determining that the running state is in a power imbalance state;
determining the current output and output margin of the comprehensive energy system, wherein the current output and output margin can not adjust the power to a balance state;
calculating the power shortage of the comprehensive energy system according to the current output and the output margin if the output meets the set conditions, and acquiring the forward deviation and the reverse deviation allowed by the power shortage according to the upper limit and the lower limit allowed by the voltage deviation;
acquiring upper and lower limits of the power shortage according to the forward and reverse deviations allowed by the power shortage, and determining the power range of the switched load or power supply of the comprehensive energy system according to the upper and lower limits of the power shortage;
and completing multi-source coordination control of the comprehensive energy system according to the power range of the switchable load or power supply.
2. The method of claim 1, wherein determining the current operating state of the integrated energy system comprises:
acquiring the power shortage of the comprehensive energy system at any moment;
if the power shortage is greater than 0, the comprehensive energy system needs to cut load or switch on a power supply;
if the power shortage is less than 0, the integrated energy system needs to load or power off.
3. The method of claim 1, wherein the performing multi-source coordination control of the integrated energy system according to the power range of the switchable load or power source comprises:
the load or the power supply is classified according to the importance degree or the operation characteristic, the load or the power supply in the same grade is sequenced according to the power, the load or the power supply is switched step by step according to the screening logic, the total amount of the switched load or the switched power supply is in the range of the power shortage, the output of the energy storage unit is adjusted, and the power shortage is supplemented by switching the load or the power supply.
4. A multi-source coordinated control system for an integrated energy system, the system comprising:
the judging module is used for judging the running state of the current comprehensive energy system and determining that the running state is in a power imbalance state;
the first calculation module is used for determining the current output and output margin of the comprehensive energy system, and the current output and output margin can not adjust the power to a balance state;
the second calculation module is used for calculating the power shortage of the comprehensive energy system according to the current output and the output margin and acquiring the forward deviation and the reverse deviation allowed by the power shortage according to the upper limit and the lower limit allowed by the voltage deviation if the output meets the set condition;
the third calculation module is used for acquiring upper and lower limits of the power shortage according to the forward and reverse deviations allowed by the power shortage, and determining the power range of the comprehensive energy system in which the load or the power supply can be switched according to the upper and lower limits of the power shortage;
and the control module is used for finishing multi-source coordination control of the comprehensive energy system according to the power range of the switchable load or power supply.
5. The system of claim 4, the determining module determining the current operating state of the integrated energy system, comprising:
acquiring the power shortage of the comprehensive energy system at any moment;
if the power shortage is greater than 0, the comprehensive energy system needs to cut load or switch on a power supply;
if the power shortage is less than 0, the integrated energy system needs to load or power off.
6. The method of claim 1, wherein the control module performs multi-source coordination control of the integrated energy system according to a power range of the switchable load or power source, and comprises:
the load or the power supply is classified according to the importance degree or the operation characteristic, the load or the power supply in the same grade is sequenced according to the power, the load or the power supply is switched step by step according to the screening logic, the total amount of the switched load or the switched power supply is in the range of the power shortage, the output of the energy storage unit is adjusted, and the power shortage is supplemented by switching the load or the power supply.
CN202110033046.3A 2021-01-11 2021-01-11 Multi-source coordination control method and system for comprehensive energy system Pending CN112688369A (en)

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