CN110854916A - Energy balance control method and device based on user energy storage - Google Patents
Energy balance control method and device based on user energy storage Download PDFInfo
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- CN110854916A CN110854916A CN201911242845.0A CN201911242845A CN110854916A CN 110854916 A CN110854916 A CN 110854916A CN 201911242845 A CN201911242845 A CN 201911242845A CN 110854916 A CN110854916 A CN 110854916A
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- energy
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
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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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to an energy balance control method and device based on user energy storage, wherein the control method comprises the following steps: 1) monitoring the switching power of the public connection point; 2) when the exchange power is larger than a set threshold value, calculating an excess amount; 3) and judging whether the user side has residual power to provide electric energy, and if not, cutting off partial load corresponding to the excess quantity. The energy balance control method meets the load requirement through the electric energy provided by the user side on the basis of not changing the original planned line, ensures the safety of the power transmission line by cutting off partial load if the user side does not provide excess electric energy, can meet the load requirement at the maximum capacity only through a control strategy, does not need to change or re-plan the line, and saves the cost.
Description
Technical Field
The invention relates to an energy balance control method and device based on user energy storage.
Background
At present, as the living standard of people is improved, the power demand is greatly increased, so that the power load is rapidly increased and far exceeds the upper limit of the circuit planning design. Meanwhile, some advanced power equipment has high power or high requirement on power quality, line planning is generally designed in a large-scale area, and if the requirement on power load is met, a line needs to be adjusted or re-planned.
Disclosure of Invention
The invention aims to provide a user energy storage based energy balance control method and device, and aims to solve the problem of high cost caused by line planning when the requirement of a power load is met.
In order to solve the technical problem, an energy balance control method based on user energy storage is provided, and comprises the following steps:
1) monitoring the switching power of the public connection point;
2) when the exchange power is larger than a set threshold value, calculating an excess amount;
3) and judging whether the user side has residual power to provide electric energy, and if not, cutting off partial load corresponding to the excess quantity.
The beneficial effects are that: the energy storage energy balance control method meets the load requirement through the electric energy provided by the user side on the basis of not changing the original planned line, ensures the safety of the power transmission line through a mode of cutting off partial load if the user side does not provide excess electric energy, can meet the load requirement in the maximum capacity only through a control strategy, does not need to change or re-plan the line, and saves the cost.
Further, the equipment for providing electric energy at the user side comprises new energy power generation equipment and energy storage equipment.
Further, when the exchange power in the step 2) is smaller than a set threshold, the electric energy generated by the new energy power generation device is used for being stored in the energy storage device.
Further, the method for judging that the new energy power generation equipment has the residual power to provide electric energy comprises the following steps: and the current output power of the new energy power generation equipment does not reach the rated power of the new energy power generation equipment.
Further, the conditions for discharging the energy storage device are as follows: the current stored electric energy of the energy storage device exceeds a first set electric energy threshold and when the daily charging and discharging times of the energy storage device are less than the set times. The safety and reliability of the energy storage device can be improved by considering the stored energy and the number of charging and discharging and then discharging.
Further, the new energy power generation equipment comprises photovoltaic power generation equipment and electric power generation equipment.
Further, the set threshold is the maximum power that the line can bear.
In order to solve the technical problem, the present invention further provides an energy balance control device based on user energy storage, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the energy balance control method based on user energy storage when executing the computer program.
Drawings
FIG. 1 is a schematic diagram of a low voltage distribution network according to the present invention;
fig. 2 is a flow chart of the energy storage energy balance control based on user energy storage according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.
Referring to fig. 1, a low-voltage distribution network according to the present invention performs power exchange via PCC to provide electric energy to a user load. The user side comprises new energy power generation equipment and energy storage equipment, the new energy power generation equipment comprises photovoltaic power generation equipment and wind power generation equipment, the new energy power generation equipment is renewable energy equipment, the provided electric energy can directly supply power to a user load, and redundant electric energy is transmitted to the energy storage equipment for storage; the energy stored by the energy storage device provides electrical energy for the user load.
For the existing circuit planning, with the increase of power equipment, the maximum power that the circuit can bear cannot meet the requirement, and in order to avoid the adjustment and redesign of the circuit layout, the invention provides an energy balance control method on the basis of the existing circuit as shown in fig. 2, so that the exchange power of the common point does not exceed the maximum power that the circuit can bear, and the power consumption requirement of the power load is met as much as possible.
The method comprises the following steps:
step 1, monitoring the exchange power of PCC in real time.
And 2, judging whether the exchange power is greater than a set threshold value, wherein the set threshold value is the maximum power which can be borne by the line.
When the exchange power is larger than the set threshold, executing the power balance strategy of the step 3; and when the exchange power is smaller than the set threshold value, executing the power storage strategy of the step 4.
And step 3, power balancing strategy.
3.1 calculating the excess Δ P of the exchange Powerover
ΔPover＝Ppcc-Pmax
In the formula, PpccFor switching power of point of common connection, PmaxTo set a threshold, i.e. the maximum power that the line can withstand.
3.2, traversing whether the wind power generation equipment and the photovoltaic power generation equipment on the user side have residual power for power generation.
The method for judging whether the residual power is generated or not comprises the following steps: the current output power of the wind power generation equipment does not reach the rated power of the wind power generation equipment, and the current output power of the photovoltaic power generation equipment does not reach the rated power of the photovoltaic power generation equipment.
If the residual force exists, the generating power of the wind power generating equipment and/or the photovoltaic generating equipment is provided; to reduce the power consumption of the point of common connection and then return to step 1. If no residual force exists, step 3.3 is executed.
3.3 traversing whether the energy storage device at the user side has the discharge capability.
The method for judging the discharge capacity of the energy storage equipment comprises the following steps: the current stored electric energy of the energy storage device exceeds a first set electric energy threshold, namely SOCcur is greater than or equal to SOCmin. The SOCcur is the current stored energy of the energy storage device, and the SOCmin is a first set energy threshold, which is the lowest remaining capacity allowed by the energy storage device in the present invention.
And (3) if the energy storage equipment with the discharging capability exists, executing the step 3.4, and if the energy storage equipment with the discharging capability does not exist, executing the step 1.
And 3.4, adding the energy storage equipment with the discharging capacity into the energy storage equipment list to be discharged, discharging the energy storage equipment in the energy storage equipment list to be discharged to provide electric energy for the user load if the daily charging and discharging times of the energy storage equipment are less than the set times so as to reduce the power consumption of the public connection point, and then executing the step 1. Otherwise, step 3.5 is performed. The set times are the maximum daily allowable charging and discharging times of the energy storage equipment.
Considering that the charge and discharge times constraint is due to the consideration of the service life of the energy storage equipment at the user side, the set times refer to the charge and discharge cycle times of the energy storage, and when the cycle times are excessive, the actual capacity of the energy storage equipment is irreversibly reduced and is lower than the nominal capacity of the energy storage equipment. Therefore, when the policy adjustment is performed, the constraint of the number of times of charging and discharging the energy storage device needs to be considered, and the number of times of charging and discharging per day is generally limited to be not more than 2.
3.5 cutting off the load.
And (3) cutting off part of load, and then returning to the step 1 until the excess amount is less than or equal to zero so as to ensure that the power consumption at the common connection point does not exceed the maximum power which can be borne by the line.
And 4, storing the strategy by power.
4.1, traversing whether the wind power generation equipment and the photovoltaic power generation equipment on the user side have residual power for power generation. If so, executing the step 4.2, otherwise, executing the step 1.
4.2 traversing whether the energy storage device at the user side can be charged.
The method for judging the charging capability of the energy storage equipment comprises the following steps: the current stored power of the energy storage device is less than the second set power threshold, i.e., SOCcur < SOCmax. The SOCmax is a second set electric energy threshold, which is the maximum remaining capacity allowed by the energy storage device in the present invention.
If there is an energy storage device that can be charged, step 4.3 is executed, and if there is no energy storage device that can be charged, step 1 is executed.
4.3 adding the energy storage equipment with the charging capability into the list of the energy storage equipment to be charged.
For the energy storage devices in the list of the energy storage devices to be charged, if the number of charging and discharging times of the energy storage devices in the day is less than the set number, the energy storage devices needing to be charged are judged, then the power generation power of the wind power generation devices and/or the photovoltaic power generation devices with residual power in the step 4.1 is increased, and the energy storage devices needing to be charged are charged; and if the daily charging and discharging times of the energy storage equipment exceed the set times, judging that the energy storage equipment in the energy storage list to be charged does not need to be charged, and executing the step 1.
The embodiment of the device is as follows:
the energy balance control method based on the user energy storage is described in detail in the method embodiment and is not described herein again.
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 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.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present application, various changes, modifications or equivalents of the embodiments of the present application can be made, and these changes, modifications or equivalents are within the protection scope of the claims of the present invention.
Claims (8)
1. An energy balance control method based on user energy storage is characterized by comprising the following steps:
1) monitoring the switching power of the public connection point;
2) when the exchange power is larger than a set threshold value, calculating an excess amount;
3) and judging whether the user side has residual power to provide electric energy, and if not, cutting off partial load corresponding to the excess quantity.
2. The energy balance control method based on user energy storage according to claim 1, wherein the devices providing electric energy at the user side comprise new energy power generation devices and energy storage devices.
3. The energy balance control method based on user stored energy according to claim 2, wherein when the exchange power in step 2) is less than the set threshold, the electric energy generated by the new energy power generation device is used for being stored in the energy storage device.
4. The energy balance control method based on the user stored energy according to claim 3, wherein the method for judging that the new energy power generation device has the surplus power to provide the electric energy comprises the following steps: and the current output power of the new energy power generation equipment does not reach the rated power of the new energy power generation equipment.
5. The energy balance control method based on user energy storage according to claim 3, wherein the energy storage device is discharged under the following conditions: the current stored electric energy of the energy storage device exceeds a first set electric energy threshold value and the daily charging and discharging times of the energy storage device are less than the set times.
6. The user stored energy based energy balance control method of claim 5, wherein the new energy power generation device comprises a photovoltaic power generation device and an electric power generation device.
7. The energy balance control method based on user energy storage according to claim 1, wherein the set threshold is the maximum power that the line can bear.
8. A user energy storage based energy balance control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the user energy storage based energy balance control method of claims 1-7 when executing the computer program.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911242845.0A CN110854916A (en) | 2019-12-06 | 2019-12-06 | Energy balance control method and device based on user energy storage |
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| CN201911242845.0A CN110854916A (en) | 2019-12-06 | 2019-12-06 | Energy balance control method and device based on user energy storage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112308409A (en) * | 2020-10-30 | 2021-02-02 | 合肥工业大学 | Block chain-based coordinated operation optimization method and system for comprehensive energy system |
| WO2021238889A1 (en) * | 2020-05-27 | 2021-12-02 | 华为技术有限公司 | Electric energy control method and related device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20200228 |