CN111539620B - Energy storage operation method and system for providing energy service - Google Patents

Abstract

The present invention provides an energy storage operation method for providing energy services. An energy storage power station receives energy storage response requests from different service objects; Whether the energy supply data meets the energy supply constraints, if so, generate the energy supply response result that can provide the service object, otherwise directly return the rejection request; the energy storage power station sends the response result to the corresponding service object. The invention proposes an energy storage power station energy service object selection and operation strategy within a response period that takes into account the power capacity constraints of the energy storage power station, improves the operation efficiency of the energy storage power station, and evaluates the real-time operation economy of the energy storage power station.

Description

An energy storage operation method and system for providing energy services

technical field

The invention belongs to the technical field of the application of energy storage in power systems, and in particular relates to an energy storage operation method and system for providing energy services in consideration of energy storage costs, benefits and the state of the energy storage power station itself.

Background technique

my country's large-scale new energy power generation bases and load centers are distributed inversely. The random, fluctuating and uncertain new energy power generation is large-scale grid-connected, and its inconsistency with the load demand timing and geographical location. Higher requirements are put forward for efficient consumption, supply quality and adequacy of system peak regulation and frequency regulation, and transmission capacity of transmission corridors. As a flexible adjustment resource, large-scale energy storage technology can improve the new energy consumption capacity of the sending-end power grid and improve the utilization efficiency of the UHV corridor. Energy storage can provide energy services for new energy power station owners, thermal power plants, power grids, and power system users. If the supply and demand of different objects are balanced, the economy of energy storage applications is improved, and the operation strategy of energy storage to provide energy services is discussed. realistic meaning. The invention proposes an energy storage operation method and system for providing energy services, and provides technical support for promoting the commercialization of energy storage providing energy service applications.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides an energy storage operation method and system for providing energy services, so as to realize the improvement of the operation efficiency of the energy storage power station, and to evaluate the economical efficiency of the real-time operation 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 services, the method comprising:

Step S1. The energy storage power station receives energy storage response requests from different service objects;

Step S2. The energy storage power station generates preprocessing data based on the response request, and judges whether the preprocessing data and the pre-stored energy supply data meet the energy supply constraints, and if so, generate the energy supply that can provide the service object. Response result, otherwise directly return to reject the request;

Step S3. The energy storage power station sends the response result to the corresponding service object.

Further, the objects include one or more of new energy power station owners, thermal power plants, power grids, and power system users.

Further, the generating the preprocessing data based on the response request, specifically, pre-setting the response time interval established between the energy storage power station and different service objects and the agreed cost between the energy storage power station and the different service objects. data, and the preprocessed data is the product of the discharge data per unit of electricity and the discharge electricity of the energy storage within the response time interval.

其中，C_i(t)为第i年[t,t+1]时段的储能电站等效成本， SOH_i(t)为第i年t时刻的储能电站健康状态值，SOH_end为退役时的储能电站健康状态值，SOH₀为初始投运时刻的储能电站健康状态值，C₀为储能系统投资成本；所述运行成本数据包括储能电站等效成本的充放电成本、运行维护成本、电网使用费、购电成本数据。Further, the pre-stored energy supply data includes equivalent cost data and operating cost data, and the equivalent cost data C _i (t) is:

Among them, C _i (t) is the equivalent cost of the energy storage power station at the time of [t,t+1] in the ith year, SOH _i (t) is the state of health value of the energy storage power station at the time t in the ith year, and SOH _end is the decommissioning The state of health value of the energy storage power station at the time of operation, SOH ₀ is the state of health value of the energy storage power station at the time of initial operation, and C ₀ is the investment cost of the energy storage system; the operating cost data includes the charge and discharge cost of the energy storage power station equivalent cost, Data on operation and maintenance costs, grid usage fees, and electricity purchase costs.

Further, the energy storage system investment cost C ₀ includes the energy storage battery system, the converter, the energy management system of the energy storage power station, the monitoring system and its secondary equipment, the booster substation, the construction cost, and the land occupation cost.

Further, the charging and discharging cost is the product of the charging and discharging cost per unit of electricity and the discharged electricity of the energy storage power station; the discharging cost per unit of electricity is the equivalent cost C _i (t) of the energy storage power station divided by the dischargeable power of the energy storage power station, the said The dischargeable power of the energy storage power station is the product of the charging and discharging depth of the energy storage power station, the remaining 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 unit operation and maintenance cost of the energy storage power station and the discharge amount of the energy storage power station. Product; the grid usage fee is the product of the unit electricity grid usage fee and the energy transmitted by the energy storage power station through the grid; the electricity purchase cost is the unit electricity charging price in the [t,t+1] period multiplied by the energy storage charging capacity within Δt.

Further, the judging whether the preprocessed data and the pre-stored energy supply data meet the energy supply constraints, and if so, generating energy supply response results based on different service objects, specifically including:

When the preprocessing data generated by the response request sent by only one service object is greater than the energy supply data, the energy storage power station discharges, and is constrained by the power capacity of the energy storage power station, and the energy storage only provides energy services for the service object; When the preprocessing data generated by the response request sent by the service object is larger than the energy supply data, the energy storage power station discharges, and the related service objects are arranged according to the size of the preprocessing data from high to low, and the power capacity of the energy storage power station is the constraint , establish the service object and the output of the energy storage power station under the constraint conditions; if the preprocessing data are all smaller than the energy supply data, if the charging cost per unit of electricity at this time is lower than the minimum unit electricity purchase cost and energy storage power station degree When the sum of electricity costs, the energy storage power station is charged, otherwise the energy storage power station will not operate.

Further, the pre-stored energy supply data also includes the input parameters of the next time period, and the input parameter value is the state of health SOH _i (t) of the energy storage power station at the time t in the ith year minus the value at different depths of discharge. The ratio of the discharge capacity to the total discharge amount in the whole life cycle at the corresponding depth of discharge.

Further, the energy storage power station also includes output dynamic operation information, wherein the dynamic operation information includes the health status of the energy storage station, the charging and discharging power curve of the energy storage station, the energy service object and value curve of the energy storage station, and the energy storage station. Overall value curve, economic indicators.

According to an embodiment of the present invention, the present invention also proposes an energy storage operation system for providing energy services, the system includes an energy storage power station power supply server and at least one service object client, wherein,

The power supply server of the energy storage power station is used to receive energy storage response requests from different service objects, and determine whether the preprocessed data and the pre-stored energy supply data meet the energy supply constraints based on the preprocessed data of the response request. , if satisfied, generate energy supply response results based on different service objects, and send the response results to the corresponding service object clients;

The service object client is used to send the energy storage response request and receive the response result.

The invention considers the state of health of the energy storage battery, the equivalent cost of the energy storage power station, the benefits and costs of energy services provided by the energy storage power station for different objects, and the constraints of the energy storage power capacity, and proposes an energy storage operation method that provides auxiliary services with the maximum profit as an index. and system, which is conducive to improving the economy of energy storage applications. First, clarify the objects that the energy storage power station provides energy services to, and set the response time interval of the energy storage power station; secondly, evaluate the benefits and costs of the energy storage power station providing energy services for different objects, and determine the objects that the energy storage power station provides energy services for; It can determine the difference in the income of the service objects provided, establish the energy storage operation method, evaluate the economic and health status of the energy storage power station, and output the dynamic operation information of the energy storage power station.

Description of drawings

Fig. 1 is the flow chart of the energy storage operation method for providing energy service proposed by the present invention;

FIG. 2 is a frame diagram of an energy storage operation system for providing energy services proposed by the present invention.

Detailed ways

For ease 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. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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 services, the method comprising:

Step S1. The energy storage power station receives energy storage response requests from different service objects.

In the embodiment of the present invention, the purpose of this step is to specify the object that the energy storage power station provides energy services, and the energy storage power station can provide energy for one or more of the new energy power station owner, thermal power plant, power grid, and power system users Serve. The energy storage response time interval Δt is set according to the operation rules or pre-agreeds between the energy storage power station and the new energy power station owner, thermal power plant, power grid, and power system users, and selects the minimum value of the time interval required for operation under different transaction objects.

In this embodiment, the energy storage power station provides energy services for service objects, and the energy requirements corresponding to different service objects are also different. Therefore, the energy storage power station needs to perform energy storage operations according to the energy storage requirements of different service objects. , therefore, the service object will send a response request based on the energy storage demand to the energy storage power station. The information carried in the response request includes the information that it needs to obtain energy, and also includes the specific information of the service object corresponding to the response request. This enables the energy storage power station to provide functional operation service solutions according to different service objects.

Step S2. Determine whether the preprocessed data and the pre-stored energy supply data satisfy the energy supply constraints, and if so, generate an energy supply response result of the service object that can be provided, otherwise directly return a rejection request.

In the embodiment of the present invention, the purpose of step S2 is to generate pre-processed data based on service requests corresponding to different services, and to determine whether to provide energy storage services to the service object sending the request by matching the pre-stored data.

Specifically, in this step, the response time interval established between the energy storage power station and different service objects and the agreed cost data between the energy storage power station and different service objects are preset, so that the preprocessed data is obtained as unit electricity discharge data The product of the stored discharge capacity within the response time interval. Establish the transaction methods of auxiliary services such as peak regulation, frequency regulation, voltage regulation, backup, black start, demand response, and emergency response, and evaluate the energy benefits of the energy storage power station providing auxiliary services within the response time interval Δt, that is, the energy storage power station is aimed at Preprocessed data generated by different service objects.

1) The energy storage power station provides energy services for new energy owners and thermal power plants. According to market rules or agreed prices, the energy income I ₁ (t) within Δt is the discharge price per unit of electricity multiplied by the energy stored and discharged within Δt.

2) The energy storage power station provides energy services for the power grid. According to market rules or agreed prices, the energy income I ₂ (t) in the [t,t+1] period is the discharge price per unit of electricity in this period multiplied by the energy storage in Δt discharge power.

3) The energy storage power station provides energy services for users. According to market rules or agreed prices, the energy income I ₃ (t) within Δt is the discharge price per unit of electricity multiplied by the energy stored and discharged within Δt.

In this embodiment, the purpose of step S2 is to establish the equivalent cost of the energy storage power station based on the state of health of the energy storage battery, and determine the operation cost of the energy storage power station, thereby obtaining pre-stored energy supply data.

Specifically, establishing the equivalent cost of the energy storage power station based on the state of health of the energy storage battery includes:

Taking the ith year as an example, the equivalent cost C _i (t) of the energy storage power station in the period of [t,t+1] in the ith year is related to the state of health of the energy storage power station, the state of health value when the energy storage is decommissioned, and the investment of the energy storage system. cost and other factors. The calculation formula is

In the formula, SOH _i (t) is the state of health value of the energy storage power station at time t in the ith year; SOH _end is the state of health value of the energy storage power station at the time of decommissioning; SOH ₀ is the state of health value of the energy storage power station at the time of initial operation; C ₀ is the investment cost of the energy storage system.

In this embodiment, the investment cost of the energy storage system includes the energy storage battery system, the converter, the energy management system of the energy storage power station, the monitoring system and its secondary equipment, the booster substation, the construction cost, and the land occupation cost.

The operating cost data is obtained based on the charging and discharging cost, operation and maintenance cost, grid usage fee, and electricity purchase cost data of the equivalent cost of the energy storage power station.

Taking the period of [t, t+1] in the i-th year as an example, the operating cost of the energy storage power station includes the charging and discharging cost, operation and maintenance cost, power grid usage fee, and electricity purchase cost 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 station is the product of the charging and discharging cost per unit of electricity and the discharging capacity of the energy storage station; the discharging cost per unit of electricity is the equivalent cost C _i (t) of the energy storage station divided by the dischargeable capacity of the energy storage station ; The dischargeable power of the energy storage power station is related to the health status of the energy storage power station, capacity attenuation characteristics, charging and discharging depth, the number of charging and discharging times, and the capacity of the energy storage power station. , the product of 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 power of the energy storage power station.

The power grid usage fee is the product of the grid usage fee per unit of electricity and the electricity transmitted by the energy storage power station through the power grid. This fee is incurred when the energy storage and energy power station owners, thermal power plants, and power system users trade.

The energy storage power station purchases electric energy from new energy owners and thermal power plants. According to market rules or contracts, the power purchase cost is the charging price per unit of electricity during the period multiplied by the energy storage charging capacity within Δt; the energy storage power station purchases electric energy from the power grid, according to market rules. Or the contract stipulates that the power purchase cost in the [t,t+1] period is the charging price per unit of electricity in this period multiplied by the energy storage charging capacity in Δt.

The average power purchase cost in the period [0,t] is the total power purchase cost in the period [0,t] divided by the total charging capacity in the period [0,t].

In the embodiment of the present invention, it is judged whether the preprocessed data and the pre-stored energy supply data satisfy the energy supply constraints, and if so, the energy supply response results based on different service objects are generated.

During the [t,t+1] period, the energy storage provides energy services to different objects. When the income of the objects served is greater than the charging and discharging costs, operation and maintenance costs, and power grids of the energy storage power station during the [t,t+1] period When the sum of the usage fee and the average power purchase cost in the [0,t] period, the energy storage power station discharges to provide energy services for the object.

When the preprocessing data generated by the response request sent by only one service object is greater than the energy supply data, the energy storage power station discharges, and is constrained by the power capacity of the energy storage power station, and the energy storage only provides energy services for the service object; When the preprocessing data generated by the response request sent by the service object is larger than the energy supply data, the energy storage power station discharges, and the related service objects are arranged according to the size of the preprocessing data from high to low, and the power capacity of the energy storage power station is the constraint , establish the service object and the output of the energy storage power station under the constraint conditions; if the preprocessing data are all smaller than the energy supply data, if the charging cost per unit of electricity at this time is lower than the minimum unit electricity purchase cost and energy storage power station degree When the sum of electricity costs, the energy storage power station is charged, otherwise the energy storage power station will not operate.

Step S3. The energy storage power station sends the response result to the corresponding service object.

In this step, based on the previous two steps, the results of whether to provide energy storage services for the service objects are sent to different service objects. In this step, the results are also returned based on the address information carried in the response requests of different service objects. .

In the embodiment of the present invention, it is also necessary to evaluate the economy and health status of the energy storage power station.

1) Evaluate the total revenue during the period [t,t+1], 2) Evaluate the initial investment cost, operation and maintenance cost, and power purchase cost of the energy storage power station, and calculate the net present value, payback period, return on investment, and internal net income and other indicators.

2) The state of health of the energy storage power station at time t in the ith year is SOH _i (t) minus the ratio of the discharge power at different depths of discharge to the total discharge in the whole life cycle at the corresponding depth of discharge, and this value is used as the storage value for the next period. The input parameter of the operating cost of the power plant.

In an embodiment of the present invention, the operation method further includes the energy storage power station outputting dynamic operation information, wherein the dynamic operation information includes the health status of the energy storage station, the charging and discharging power curve of the energy storage station, and the energy service object of the energy storage station. And value curve, overall value curve of energy storage power station, economic indicators.

The present invention also provides an energy storage operation system for providing energy services, the system includes an energy storage power station power supply server and at least one service object client, wherein,

The power supply server of the energy storage power station is used to receive energy storage response requests from different service objects, and determine whether the preprocessed data and the pre-stored energy supply data meet the energy supply constraints based on the preprocessed data of the response request. , if satisfied, generate energy supply response results based on different service objects, and send the response results to the corresponding service object clients; the service object clients are used to send energy storage response requests and receive response results.

The invention provides an energy storage operation method and system for providing energy services. The method considers the objects that energy storage provides energy services in the power system, and combines with market mechanisms, considering the health status of energy storage batteries, the equivalent cost of energy storage power stations, Energy service revenue, the selection and operation strategy of energy service object of energy storage power station within the response period taking into account the power capacity constraints of energy storage power station are proposed, so as to improve the operation efficiency of energy storage power station, and evaluate the economics of real-time operation of energy storage power station.

For those skilled in the art, it is obvious that the embodiments of the present invention are not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential features of the embodiments of the present invention example. Accordingly, the embodiments are to be considered in all respects as exemplary and not restrictive, the scope of the embodiments of the present invention being defined by the appended claims rather than the foregoing description, and are therefore intended to fall within the scope of All changes within the meaning and scope of equivalents of the claims are included in the embodiments of the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim. Furthermore, it is clear that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Multiple units, modules or means recited in the system, device or terminal claims can also be implemented by the same unit, module or means by software or hardware. The terms first, second, etc. are used to denote names and do not denote any particular order. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention have been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should Modifications or equivalent substitutions to the technical solutions of the embodiments of the present invention should not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. An energy storage operation method for providing energy services, wherein the method comprises: Step S1. The energy storage power station receives energy storage response requests from different service objects; Step S2. The energy storage power station generates preprocessing data based on the response request, and judges whether the preprocessing data and the pre-stored energy supply data meet the energy supply constraints, and if so, generate the energy supply that can provide the service object. Response result, otherwise directly return to reject the request; Step S3. The energy storage power station sends the response result to the corresponding service object; The objects include one or more of new energy power station owners, thermal power plants, power grids, and power system users; The generating of the preprocessing data based on the response request specifically includes presetting the response time interval established between the energy storage power station and different service objects and the agreed cost data between the energy storage power station and different service objects, so The preprocessing data is the product of the discharge data per unit of electricity and the energy storage discharge electricity within the response time interval; The pre-stored energy supply data includes equivalent cost data and running cost data, and the equivalent cost data C _i (t) is:

Among them, C _i (t) is the equivalent cost of the energy storage power station at the time of [t, t+1] in the ith year, SOH _i (t) is the state of health value of the energy storage power station at the time t in the ith year, and SOH _end is the decommissioning The state of health value of the energy storage power station at the time of operation, SOH ₀ is the state of health value of the energy storage power station at the time of initial operation, and C ₀ is the investment cost of the energy storage system; the operating cost data includes the charge and discharge cost of the energy storage power station equivalent cost, Data on operation and maintenance costs, grid usage fees, and electricity purchase costs; The energy storage power station further includes output dynamic operation information, wherein the dynamic operation information includes the health status of the energy storage station, the charging and discharging power curve of the energy storage station, the energy service object and value curve of the energy storage station, and the overall value curve of the energy storage station. , economic indicators. 2 . The energy storage operation method according to claim 1 , wherein the energy storage system investment cost C ₀ includes an energy storage battery system, a converter, an energy management system for an energy storage power station, a monitoring system and its secondary Equipment, booster substations, construction costs, and land occupation costs. 3. The energy storage operation method according to claim 2, wherein the charging and discharging cost is the product of the charging and discharging cost per unit of electricity and the discharged electricity of the energy storage power station; the discharging cost per unit of electricity is the equivalent cost C of the energy storage power station _i (t) divided by the dischargeable power of the energy storage power station, the dischargeable power of the energy storage power station is the product of the charging and discharging depth of the energy storage power station, the remaining charging and discharging times of the energy storage power station, and the capacity of the energy storage power station; operation and maintenance costs is the product of the unit operation and maintenance cost of the energy storage power station and the amount of electricity discharged by the energy storage power station; the grid usage fee is the product of the grid usage fee per unit of electricity and the electricity transmitted by the energy storage power station through the power grid; the power purchase cost is within the period of [t,t+1] The charging price per unit of electricity is multiplied by the energy storage charging capacity within Δt. 4 . The energy storage operation method according to claim 2 , wherein the judgment is to determine whether the pre-processed data and the pre-stored energy supply data satisfy the energy supply constraint conditions, and if so, generate an energy storage system based on different service objects. 5 . The energy supply response results, including: When the preprocessing data generated by the response request sent by only one service object is greater than the energy supply data, the energy storage power station discharges, and is constrained by the power capacity of the energy storage power station, and the energy storage only provides energy services for the service object; When the preprocessing data generated by the response request sent by the service object is larger than the energy supply data, the energy storage power station discharges, and the related service objects are arranged according to the size of the preprocessing data from high to low, and the power capacity of the energy storage power station is the constraint , establish the service object and the output of the energy storage power station under the constraint conditions; if the preprocessing data are all smaller than the energy supply data, if the charging cost per unit of electricity at this time is lower than the minimum unit electricity purchase cost and energy storage power station degree When the sum of electricity costs, the energy storage power station is charged, otherwise the energy storage power station will not operate. 5 . The energy storage operation method according to claim 1 , wherein the pre-stored energy supply data further includes an input parameter of the next time period, and the input parameter value is the energy storage power station at time t in the ith year. 6 . The state of health SOH _i (t) minus the ratio of the discharge capacity at different depths of discharge to the total discharge in the whole life cycle at the corresponding depth of discharge.

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