CN111539620B - Energy storage operation method and system for providing energy service - Google Patents
Energy storage operation method and system for providing energy service Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 224
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- 230000036541 health Effects 0.000 claims description 24
- 230000005611 electricity Effects 0.000 claims description 20
- 238000012423 maintenance Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 9
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Abstract
The invention provides an energy storage operation method for providing energy service, wherein an energy storage power station receives energy storage response requests from different service objects; generating preprocessing data based on the response request, judging whether the preprocessing data and pre-stored energy supply data meet energy supply constraint conditions, if so, generating an energy supply response result of the service object which can be provided, and otherwise, directly returning a rejection request; and the energy storage power station sends the response result to a corresponding service object. The energy storage power station energy service object selection and operation strategy in the response time interval considering the energy storage power station power capacity constraint is provided, the energy storage power station operation benefit is improved, and the real-time operation economy of the energy storage power station is evaluated.
Description
Technical Field
The invention belongs to the technical field of application of energy storage in an electric power system, and particularly relates to an energy storage operation method and system for providing energy service by considering energy storage cost, income and self state of an energy storage power station.
Background
The large-scale new energy power generation base and the load center in China are reversely distributed, and the new energy power generation with randomness, volatility and uncertainty is connected to the grid in a large scale, and the non-consistency of the new energy power generation base, the load demand time sequence and the geographic position puts forward higher requirements on the high-efficiency consumption of new energy, the supply quality and the abundance degree of system peak regulation and frequency modulation, and the transmission capacity of a power transmission corridor. The large-scale energy storage technology is used as a flexible adjusting resource, the new energy consumption capability of a transmission end power grid can be improved, and the utilization efficiency of the extra-high voltage corridor can be improved. The energy storage can provide energy service for new energy power station owners, thermal power plants, power grids and power system users, if supply and demand of different objects are balanced, economy of energy storage application is improved, operation strategies for providing energy service through energy storage are discussed, and the method has certain practical significance. The invention provides an energy storage operation method and system for providing energy service, and provides technical support for commercial popularization of energy service application for propelling energy storage.
Disclosure of Invention
In order to solve the technical problems, the invention provides an energy storage operation method and system for providing energy service, so as to improve the operation benefit of an energy storage power station and evaluate the real-time operation economy of the energy storage power station.
According to an embodiment of the present invention, the present invention provides an energy storage operation method for providing energy service, the method including:
s1, an energy storage power station receives energy storage response requests from different service objects;
s2, the energy storage power station generates preprocessing data based on the response request, whether the preprocessing data and pre-stored energy supply data meet energy supply constraint conditions or not is judged, if yes, an energy supply response result of an object capable of providing the service is generated, and if not, a rejection request is directly returned;
and S3, the energy storage power station sends the response result to a corresponding service object.
Further, the object comprises one or more of new energy power station owners, thermal power plants, power grids and power system users.
Further, the generating of the preprocessed data based on the response request specifically includes presetting a response time interval established between the energy storage power station and different service objects and agreed cost data between the energy storage power station and different service objects, where the preprocessed data is a product of unit electric quantity discharge data and the stored energy discharge electric quantity in the response time interval.
Further, the pre-stored energy supply data comprises equivalent cost data and operation cost data, and the equivalent cost data C i (t) is
Wherein, C i (t) is year i [ t, t +1]]Time-interval equivalent cost, SOH, of energy storage power station i (t) is the state of health (SOH) value of the energy storage power station at the ith year t end Is the state of health, SOH, of the energy storage power station in decommissioning 0 Value of the state of health, C, of the energy storage power station at the initial commissioning moment 0 Investment cost for the energy storage system; the operation cost data comprises charge and discharge cost, operation maintenance cost, power grid use cost and electricity purchasing cost data of equivalent cost of the energy storage power station.
Further, the investment cost C of the energy storage system 0 The system comprises an energy storage battery system, a converter, an energy storage power station energy management system, a monitoring system and secondary equipment thereof, a boosting transformer substation, construction cost and floor occupation cost.
Further, the charge-discharge cost is the product of the charge-discharge cost of unit electric quantity and the discharge electric quantity of the energy storage power station; the discharge cost of unit electric quantity is equivalent cost C of the energy storage power station i (t) dividing by the dischargeable electrical quantity of the energy storage power station, said energy storage power station beingThe discharge electric quantity is the product of the charge-discharge depth of the energy storage power station, the residual charge and discharge times of the energy storage power station and the capacity of the energy storage power station; the operation and maintenance cost is the product of the unit operation and maintenance cost of the energy storage power station and the discharge electric quantity of the energy storage power station; the power grid use fee is the product of the unit electric quantity and the electric quantity transmitted by the energy storage power station through the power grid; the electricity purchasing cost is t, t +1]And multiplying the charging price of the unit electric quantity within the time interval by the stored charging electric quantity within delta t.
Further, the determining whether the preprocessed data and the pre-stored energy supply data satisfy the energy supply constraint condition, and if so, generating an energy supply response result based on different service objects, specifically including:
when the preprocessed data generated by the response request sent by only one service object is larger than the energy supply data, the energy storage power station discharges, the power capacity of the energy storage power station is taken as constraint, and the energy storage only provides energy service for the service object; when preprocessed data generated by response requests sent by a plurality of service objects are all larger than energy supply data, the energy storage power station discharges, related service objects are arranged from high to low according to the size of the preprocessed data, the power capacity of the energy storage power station is taken as constraint, and the service objects and the output of the energy storage power station under the constraint condition are established; if the preprocessed data are all smaller than the energy supply data, the energy storage power station is charged if the unit electric quantity charging cost at the moment is lower than the sum of the lowest unit electric quantity electricity purchasing cost and the energy storage power station electricity consumption cost, otherwise, the energy storage power station does not act.
Furthermore, the prestored energy supply data also comprises input parameters of the next time period, and the input parameters are the state of health (SOH) of the energy storage power station at the t moment of the ith year i (t) subtracting the ratio of the discharge capacity under different discharge depths to the total discharge capacity of the full life cycle under the corresponding discharge depth.
Further, the energy storage power station also comprises dynamic operation information output, wherein the dynamic operation information comprises the health state of the energy storage power station, a charge and discharge power curve of the energy storage power station, an energy service object and value curve of the energy storage power station, an overall value curve of the energy storage power station and economic indexes.
According to an embodiment of the present invention, the present invention further provides an energy storage operation system for providing energy services, the system includes an energy storage power station power supply service end and at least one service object client end, wherein,
the energy storage power station power supply server is used for receiving energy storage response requests from different service objects, generating preprocessed data based on the response requests, judging whether the preprocessed data and pre-stored energy supply data meet energy supply constraint conditions, if so, generating energy supply response results based on the different service objects, and sending the response results to corresponding service object clients;
and the service object client is used for sending the energy storage response request and receiving the response result.
The invention provides the energy storage operation method and system for providing auxiliary service with maximum profit index by considering the health state of the energy storage battery, the equivalent cost of the energy storage power station, the energy service profit and cost of different objects provided by the energy storage power station and the energy storage power capacity constraint, and is beneficial to improving the economy of energy storage application. Firstly, defining an object for providing energy service by an energy storage power station, and setting a response time interval of the energy storage power station; secondly, evaluating the profit and the cost of the energy storage power station for providing energy services facing different objects, and establishing an object for providing the energy services by energy storage; and finally, based on the difference of the profits of the service objects provided by the energy storage, establishing an energy storage operation method, evaluating the economical efficiency and the health state of the energy storage power station, and outputting dynamic operation information of the energy storage power station.
Drawings
Fig. 1 is a flowchart of an energy storage operation method for providing energy service according to the present invention;
fig. 2 is a frame diagram of an energy storage operation system for providing energy service according to the present invention.
Detailed Description
For the convenience of understanding, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, as shown in fig. 1, the present invention provides an energy storage operation method for providing energy service, the method including:
s1, an energy storage power station receives energy storage response requests from different service objects.
In the embodiment of the invention, the purpose of this step is to specify the object of providing energy service for the energy storage power station, and the energy storage power station can provide energy service for one or more of new energy power station owners, thermal power plants, power grids and power system users. The energy storage response time interval delta t is set according to operation rules or preconceived rules between the energy storage power station and new energy power station owners, thermal power plants, power grids and power system users, and the minimum value of the operation requirement time interval under different transaction objects is selected.
In this embodiment, the energy storage power station provides energy service for the service object, and the energy requirements corresponding to different service objects are also different, so that the energy storage power station needs to perform energy storage operation according to the energy storage requirements of different service objects, and therefore, the service object can send a response request based on the energy storage requirement to the energy storage power station, information carried in the response request includes information that the energy storage power station needs to acquire energy, and also includes specific information of the service object corresponding to the response request, so that the energy storage power station provides a functional operation service scheme according to different service objects.
And S2, judging whether the preprocessed data and the pre-stored energy supply data meet energy supply constraint conditions, if so, generating an energy supply response result of the service object which can be provided, and otherwise, directly returning a rejection request.
In the embodiment of the present invention, the step S2 is to generate a preprocessed data based on the service request corresponding to different services, and determine whether to provide the energy storage service to the service object sending the request by matching the pre-stored data.
Specifically, in this step, a response time interval established between the energy storage power station and different service objects and agreed cost data between the energy storage power station and different service objects are preset, so that the preprocessed data is obtained as a product of the unit electric quantity discharge data and the energy storage discharge electric quantity in the response time interval. And establishing transaction modes of auxiliary services such as peak shaving, frequency modulation, voltage regulation, standby, black start, demand response, emergency response and the like, and evaluating the energy yield of the auxiliary services provided by the energy storage power station within a response time interval delta t, namely preprocessing data generated by the energy storage power station aiming at different service objects.
1) The energy storage power station provides energy service for new energy owners and thermal power plants, and energy profit I in delta t is obtained according to market rules or agreed prices 1 And (t) is the discharge price of unit electric quantity multiplied by the stored energy discharge electric quantity in delta t.
2) The energy storage power station provides energy service for the power grid, and according to market rules or agreed prices, [ t, t +1]]Energy gain over time I 2 And (t) is the discharge price per unit of electric quantity in the time period multiplied by the stored discharge electric quantity in delta t.
3) The energy storage power station provides energy service for users, and energy profit I in delta t is obtained according to market rules or agreed prices 3 And (t) is the discharge price of unit electric quantity multiplied by the stored energy discharge electric quantity in delta t.
In the present embodiment, the purpose of step S2 is to establish an energy storage plant equivalent cost based on the state of health of the energy storage battery, determine the energy storage plant operating cost, and obtain the pre-stored energy supply data.
Specifically, establishing the energy storage power station equivalent cost based on the state of health of the energy storage battery comprises:
in year i, for example, [ t, t +1] in year i]Equivalent cost C of time interval energy storage power station i And (t) is related to factors such as the health state of the energy storage power station, the health state value of the energy storage system during retirement, the investment cost of the energy storage system and the like. Is calculated by the formula
In the formula, SOH i (t) isThe health state value of the energy storage power station at the ith year t moment; SOH end The value is the health state value of the energy storage power station during retirement; SOH 0 The value is the health state value of the energy storage power station at the initial commissioning moment; c 0 And the investment cost of the energy storage system is reduced.
In this embodiment, the investment cost of the energy storage system includes an energy storage battery system, a converter, an energy management system of the energy storage power station, a monitoring system and its secondary equipment, a step-up transformer substation, a construction cost, an occupation cost, and the like.
And obtaining operation cost data based on the charging and discharging cost, the operation maintenance cost, the power grid use fee and the electricity purchasing cost data of the equivalent cost of the energy storage power station.
Taking the [ t, t +1] time interval of the ith year as an example, the operation cost of the energy storage power station comprises the charge-discharge cost, the operation maintenance cost, the power grid use cost, the electricity purchasing cost and the like based on the equivalent cost of the energy storage power station.
The charging and discharging cost based on the equivalent cost of the energy storage power station is the product of the charging and discharging cost of unit electric quantity and the discharging electric quantity of the energy storage power station; the discharge cost of unit electric quantity is equivalent cost C of the energy storage power station i (t) dividing by the dischargeable electric quantity of the energy storage power station; the dischargeable electric quantity of the energy storage power station is related to factors such as the health state of the energy storage power station, capacity attenuation characteristics, charging and discharging depth, charging and discharging times, capacity of the energy storage power station and the like, and is the product of the charging and discharging depth of the energy storage power station, the residual charging and discharging times of the energy storage power station and the capacity of the energy storage power station. The operation and maintenance cost is the product of the unit operation and maintenance cost of the energy storage power station and the discharge electric quantity of the energy storage power station.
The power grid usage charge is the product of the unit electric quantity of the power grid usage charge and the electric quantity transmitted by the energy storage power station through the power grid, and the charge occurs when the energy storage is transacted with an energy power station owner, a thermal power plant and a power system user.
The energy storage power station purchases electric energy from a new energy owner and a thermal power plant, and the electricity purchasing cost is the unit electric quantity charging price in the time period multiplied by the stored energy charging electric quantity in delta t according to market rules or contract agreement; the energy storage power station purchases electric energy from a power grid, and according to market rules or contract agreement, the electricity purchasing cost in the period of [ t, t +1] is the unit electricity charging price in the period multiplied by the energy storage charging electricity in delta t.
The average electricity purchasing cost in the [0, t ] time period is the total electricity purchasing cost in the [0, t ] time period divided by the total charging capacity in the [0, t ] time period.
In the embodiment of the invention, whether the preprocessed data and the pre-stored energy supply data meet the energy supply constraint condition is judged, and if so, the energy supply response result based on different service objects is generated.
And when the profit of the served object is greater than the sum of the charge-discharge cost, the operation maintenance cost, the power grid use cost of the energy storage power station in the [ t, t +1] time period and the average electricity purchasing cost in the [0, t ] time period, the energy storage power station discharges to provide the energy service for the object.
When the preprocessed data generated by the response request sent by only one service object is larger than the energy supply data, the energy storage power station discharges, the power capacity of the energy storage power station is taken as constraint, and the energy storage only provides energy service for the service object; when preprocessed data generated by response requests sent by a plurality of service objects are all larger than energy supply data, the energy storage power station discharges, related service objects are arranged from high to low according to the size of the preprocessed data, the power capacity of the energy storage power station is taken as constraint, and the service objects and the output of the energy storage power station under the constraint condition are established; if the preprocessed data are all smaller than the energy supply data, the energy storage power station is charged if the unit electric quantity charging cost at the moment is lower than the sum of the lowest unit electric quantity electricity purchasing cost and the energy storage power station electricity consumption cost, otherwise, the energy storage power station does not act.
And S3, the energy storage power station sends the response result to a corresponding service object.
In this step, the result of whether to provide the energy storage service for the service object is sent to different service objects based on the previous two steps, and in this step, the result is also returned based on the address information carried in the response request of different service objects.
In the embodiment of the invention, the economical efficiency and the health state of the energy storage power station also need to be evaluated.
1) And (2) evaluating the total income in the period of [ t, t +1], 2) evaluating the initial investment cost, the operation maintenance cost and the electricity purchasing cost of the energy storage power station, and calculating indexes such as net present value, investment recovery period, investment return rate, internal net income and the like.
2) The health state of the energy storage power station at the moment t of the ith year is SOH i And (t) subtracting the ratio of the discharge electric quantity under different discharge depths to the total discharge quantity of the whole life cycle under the corresponding discharge depth, and taking the value as an input parameter of the operation cost of the energy storage power station in the next period.
In the embodiment of the invention, the operation method further comprises the step of outputting dynamic operation information by the energy storage power station, wherein the dynamic operation information comprises the health state of the energy storage power station, a charge and discharge power curve of the energy storage power station, an energy service object and value curve of the energy storage power station, an overall value curve of the energy storage power station and economic indexes.
The invention also provides an energy storage operation system for providing energy service, which comprises an energy storage power station power supply service end and at least one service object client end, wherein,
the energy storage power station power supply server is used for receiving energy storage response requests from different service objects, generating preprocessed data based on the response requests, judging whether the preprocessed data and pre-stored energy supply data meet energy supply constraint conditions, if so, generating energy supply response results based on the different service objects, and sending the response results to corresponding service object clients; and the service object client is used for sending the energy storage response request and receiving the response result.
The invention provides an energy storage operation method and system for providing energy service, the method considers the object of providing energy service in an electric power system by energy storage, combines a market mechanism, considers the health state of an energy storage battery, the equivalent cost of an energy storage power station and the income of energy service, provides an energy service object selection and operation strategy of the energy storage power station in a response time interval considering the power capacity constraint of the energy storage power station, improves the operation benefit of the energy storage power station, and evaluates the real-time operation economy of the energy storage power station.
It will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention are capable of being embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, apparatus or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order. Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting, and although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A method of energy storage operation for providing energy services, the method comprising:
s1, an energy storage power station receives energy storage response requests from different service objects;
s2, the energy storage power station generates preprocessing data based on the response request, whether the preprocessing data and pre-stored energy supply data meet energy supply constraint conditions or not is judged, if yes, an energy supply response result of an object capable of providing the service is generated, and if not, a rejection request is directly returned;
s3, the energy storage power station sends the response result to a corresponding service object;
the object comprises one or more of new energy power station owners, thermal power plants, power grids and power system users;
generating preprocessing data based on the response request, specifically, presetting a response time interval established between an energy storage power station and different service objects and agreed cost data between the energy storage power station and the different service objects, wherein the preprocessing data is the product of unit electric quantity discharge data and the energy storage discharge electric quantity in the response time interval;
the pre-stored energy supply data comprises equivalent cost data and running cost data, wherein the equivalent cost data C i (t) is
Wherein, C i (t) is year i [ t, t +1]]Time-of-day equivalent cost, SOH, of energy storage power stations i (t) is the state of health (SOH) value of the energy storage power station at the ith year t end For the state of health, SOH, of the energy-storing power station in retirement 0 Value of the state of health, C, of the energy storage power station at the initial commissioning moment 0 Investment cost for the energy storage system; the operation cost data comprises charging and discharging cost, operation maintenance cost, power grid use cost and electricity purchasing cost data of equivalent cost of the energy storage power station;
the energy storage power station also comprises output dynamic operation information, wherein the dynamic operation information comprises the health state of the energy storage power station, a charge and discharge power curve of the energy storage power station, an energy service object and value curve of the energy storage power station, an overall value curve of the energy storage power station and economic indexes.
2. The energy storage operation method according to claim 1, wherein the energy storage system investment cost C 0 The system comprises an energy storage battery system, a converter, an energy storage power station energy management system, a monitoring system and secondary equipment thereof, a boosting transformer substation, construction cost and floor occupation cost.
3. The energy storage operation method according to claim 2, wherein the charge and discharge cost is a charge and discharge cost per unit electric quantity and a discharge of an energy storage power stationThe product of the electric quantities; the discharge cost of unit electric quantity is equivalent cost C of the energy storage power station i (t) dividing the dischargeable electric quantity of the energy storage power station by the product of the charge-discharge depth of the energy storage power station, the residual charge and discharge times of the energy storage power station and the capacity of the energy storage power station; the operation and maintenance cost is the product of the unit operation and maintenance cost of the energy storage power station and the discharge electric quantity of the energy storage power station; the power grid use fee is the product of the unit electric quantity and the electric quantity transmitted by the energy storage power station through the power grid; the electricity purchasing cost is t, t +1]And multiplying the charging price of the unit electric quantity within the time interval by the stored charging electric quantity within the delta t.
4. The energy storage operation method according to claim 2, wherein the determining whether the preprocessed data and the pre-stored energy supply data satisfy an energy supply constraint condition, and if so, generating an energy supply response result based on different service objects specifically includes:
when the preprocessed data generated by the response request sent by only one service object is larger than the energy supply data, the energy storage power station discharges, the power capacity of the energy storage power station is taken as constraint, and the energy storage only provides energy service for the service object; when preprocessed data generated by response requests sent by a plurality of service objects are all larger than energy supply data, the energy storage power station discharges, related service objects are arranged from high to low according to the size of the preprocessed data, the power capacity of the energy storage power station is taken as constraint, and the service objects and the output of the energy storage power station under the constraint condition are established; if the preprocessed data are all smaller than the energy supply data, the energy storage power station is charged if the unit electric quantity charging cost at the moment is lower than the sum of the lowest unit electric quantity electricity purchasing cost and the energy storage power station electricity consumption cost, otherwise, the energy storage power station does not act.
5. The energy storage operation method according to claim 1, wherein the pre-stored energy supply data further comprises an input parameter for the next time period, and the input parameter is the state of health (SOH) of the energy storage power station at the ith year t i (t) subtracting the ratio of the discharge capacity at different depths of discharge to the total discharge capacity at the corresponding depth of discharge over the full life cycleThe value is obtained.
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| KR20180121217A (en) * | 2017-04-28 | 2018-11-07 | 효성중공업 주식회사 | Asset management method for electric power apparatus |
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