Operation method of new energy station self-configured energy storage sharing alliance

Abstract

The invention relates to an operation method of a new energy station self-configured energy storage sharing alliance, and belongs to the field of new energy station power generation side sharing energy storage operation and scheduling. The method comprises the following steps: S1, providing a new energy station self-configured energy storage sharing alliance architecture for a new energy station with relatively large single power generation capacity; s2, considering factors such as green certificate revenue, power transmission cost and energy storage system loss cost, and constructing a new energy station shared alliance revenue model; and S3, in combination with the sharing alliance architecture, establishing a new energy station self-configuration sharing alliance operation mechanism. According to the new energy station and the self-configured energy storage system thereof, the self-configured energy storage of the new energy station is optimized and dispatched according to the operation scene, the new energy consumption and the energy storage utilization rate can be effectively improved, the wind abandoning rate or the light abandoning rate of the new energy station is reduced, and the economic benefit of the new energy station in the shared alliance is increased.

Description

Technical Field

[0001] The present invention belongs to the field of shared energy storage operation and scheduling on the power generation side of a new energy station, and relates to an operation method of a self-distributed energy storage sharing alliance of a new energy station. Background Art

[0002] In order to meet energy demand and reduce carbon emissions, the scale of new energy installations, mainly wind and solar, is increasing. In particular, for new energy stations with large single-unit power generation, the strong volatility, randomness and intermittency of wind and solar output make it difficult to dispatch new energy stations and affect their grid connection and absorption. In order to solve the grid fluctuations and wind and solar grid connection and absorption problems caused by the high proportion of new energy stations connected to the power grid, it is necessary to carry out research on the operation method of the self-distributed energy storage sharing alliance of new energy stations, which can provide technical support for the self-distributed energy storage sharing of large-scale new energy stations, and has important engineering application value for promoting the absorption of renewable energy. The present invention proposes a self-distributed energy storage sharing alliance architecture for new energy stations with large single-unit power generation; considers factors such as green certificate income, transmission cost and energy storage system loss cost, and constructs a new energy station sharing alliance income model; combines the sharing alliance architecture to establish a new energy station self-distributed sharing alliance operation mechanism. The application of the present invention can effectively improve the absorption of new energy electricity and the utilization rate of energy storage systems, reduce the wind abandonment rate or light abandonment rate of new energy stations, and increase the economic benefits of new energy stations in the sharing alliance. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide an operation method of a new energy station self-distributed energy storage sharing alliance. After proposing a new energy station self-distributed energy storage sharing alliance architecture, a new energy station self-distributed sharing alliance revenue model is first constructed, and then a new energy station self-distributed sharing alliance operation mechanism is established based on the sharing alliance architecture.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] An operation method of a new energy site self-distributed energy storage sharing alliance, the method comprising the following steps:

[0006] For new energy stations with large single-unit power generation, a new energy station self-distributed energy storage sharing alliance architecture is established;

[0007] Considering the green certificate income, transmission costs and energy storage system loss costs, a new energy station sharing alliance income model is established;

[0008] Combined with the shared alliance architecture, a new energy station self-distribution shared alliance operation mechanism will be established.

[0009] Furthermore, the new energy station self-distributed energy storage sharing alliance architecture includes a power grid dispatching center and multiple new energy stations with self-distributed energy storage systems.

[0010] Furthermore, the new energy station sharing alliance revenue model includes a shared alliance revenue model and a new energy station revenue model; wherein the new energy station refers to photovoltaic power stations and wind farms.

[0011] Furthermore, the shared alliance revenue model specifically includes:

[0012]

[0013] In the formula, I is the shared alliance income, T is the total time period; I t is the income of the alliance in period t;

[0014]

[0015] In the formula, I i,t,PV and I i,t,W are the revenues of photovoltaic power station i and wind farm i in period t respectively;

[0016] The new energy station revenue model specifically includes:

[0017] I i,t =I sal,i,t +I cept,i,t +I de,i,t -I tc,i,t -I esc,i,t (3)

[0018] In the formula, I i,t is the revenue of new energy station i in period t, I sal,i,t I is the income from electricity sales; cept,i,t I is the income from carbon emission rights; de,i,t To reduce the benefits of wind / solar abandonment penalties; I tc,i,t is the transmission cost; I esc,i,t Energy storage loss cost;

[0019] ① The revenue from electricity sales is:

[0020] I sal,i,t =P sal,i,t ξ sal,x Δt (4)

[0021] Where P sal,i,t is the electricity sales power; sal,x is the electricity price sold at the site, x is W or PV; Δt is the transaction time interval;

[0022] ② The income from green certificates is:

[0023] I green,i,t =X i,t ξ g,i,t (5)

[0024] In the formula, X i,t and g,i,t They are the number of green certificates and the price of green certificates respectively;

[0025] ③The transmission cost is:

[0026] I tc,i,t =ξ tc,i,t P sal,i,t Δt (6)

[0027] In the formula, ξ tc,i,t is the cost coefficient of transmission line loss;

[0028] ④The loss cost of the energy storage system is:

[0029] I esc,i,t =E i,t ξ L ξ ins,i,t Δt (7)

[0030] In the formula, E i,t is the total charge and discharge capacity; ins,i,t is the unit cost coefficient of energy storage charging and discharging; ξ L is the life loss cost coefficient of the energy storage system, 0≤ξ L ≤1;

[0031]

[0032] ⑤ The benefits of reducing the penalty for wind / solar abandonment are:

[0033]

[0034] Where P p,i,t and P a,i,t are the planned power generation and actual power generation of station i in period t respectively; P lea,i,t It is the charging and discharging power of the alliance station’s self-allocated energy storage during period t.

[0035] Furthermore, the operation mechanism of the new energy station self-distribution sharing alliance is as follows:

[0036] Based on the data of operating parameters, energy storage capacity and state of charge (SOC) of new energy stations, the operation scenarios are divided according to the planned output and actual output of the stations, and the operation mechanism of the new energy station self-distributed energy storage sharing alliance based on the division of operation scenarios is proposed, which is as follows:

[0037] ①Scene 1 is P p,i,t <P a,i,t , indicating that the power generation of station i in period t is in excess, SOC max and SOC minThey are the maximum and minimum values ​​of the energy storage state of charge; SOC own and SOC lea They are the self-storage SOC of station i and the energy storage SOC of alliance stations;

[0038] The charging and discharging capacity of the self-provisioned energy storage at station i is:

[0039]

[0040] Where P own,i,t is the charging and discharging power of the self-allocated energy storage of station i at time t;

[0041] The energy storage SOC of the alliance station is:

[0042]

[0043] In the formula, E j,t The remaining energy stored in the alliance station at time t, E j,se Allocate capacity for energy storage batteries at alliance sites;

[0044] 1) When SOC own =SOC max When SOC lea ≥SOC max , the output of station i is the planned output, that is, P sal,i,t =P p,i,t Otherwise, station i provides charging power to the alliance’s self-distributed energy storage, that is, P sal,i,t =P p,i,t +P lea,i,t ;P lea,i,t The charging and discharging power of the alliance station's self-allocated energy storage during period t;

[0045] 2) When SOC min <SOC own <SOC max When station i provides charging power to the self-distributed energy storage, if station i has surplus output and SOC lea ≥SOC max , that is, P sal,i,t =P p,i,t , the station should reduce power operation; otherwise, station i provides paid charging power to the alliance's self-distributed energy storage, that is, P sal,i,t =P p,i,t +P lea,i,t ;

[0046] 3) When SOC own =SOC min When station i provides charging power to the self-distributed energy storage, that is, P sal,i,t =P p,i,t ;

[0047] ②Scene 2 is P p,i,t =P a,i,t , indicating that the actual output of station i in period t is equal to the planned output. At this time, the output of station i is the planned output, that is, P sal,i,t =P p,i,t ;

[0048] ③Scene 3 is P p,i,t >P a,i,t , indicating that the power generation of station i in period t is insufficient, the operation mechanism is divided by the SOC state of the station's self-equipped energy storage; when SOC min <SOC own ≤SOC max When P p,i,t -P a,i,t ≤P own,i,t , the station's self-equipped energy storage can completely make up for the power shortage, and the output of station i is the planned output, that is, P sal,i,t =P p,i,t ; Otherwise, determine the power generation status of the alliance station; if P p,j,t >P a,j,t , the output of station i is the actual output, that is, P sal,i,t =P a,i,t Otherwise, determine whether the alliance station can fully make up for the power shortage; if P p,i,t -P a,i,t -P own,i,t ≤P a,j,t -P p,j,t , the output of station i is the planned output, that is, P sal,i,t =P p,i,t ; Otherwise, determine the charge state of the alliance energy storage; if SOC lea <SOC min , that is, P sal,i,t =P p,i,t -P own,i,t Otherwise, determine whether the alliance energy storage can make up for the power shortage; if P p,i,t -P a,i,t -P own,i,t -(P a,j,t -P p,j,t )≤P lea,i,t , the alliance energy storage can fully make up for the power shortage, that is, P sal,i,t =P p,i,t Otherwise, P sal,i,t =P a,i,t +P a,j,t -P p,j,t +P lea,i,t ; When SOC own =SOC min When P p,j,t >P a,j,t, the output of station i is the actual output, that is, P sal,i,t =P a,i,t Otherwise, determine whether the alliance station can fully make up for the power shortage; if P p,i,t -P a,i,t ≤P a,j,t -P p,j,t , the output of station i is the planned output, that is, P sal,i,t =P p,i,t ; Otherwise, determine the charge state of the alliance energy storage; if SOC lea <SOC min , that is, P sal,i,t =P a,i,t +P p,j,t -P a,j,t Otherwise, determine whether the alliance energy storage can make up for the power shortage; if P p,i,t -P a,i,t -(P a,j,t -P p,j,t )≤P lea,i,t , the alliance energy storage can fully make up for the power shortage, that is, P sal,i,t =P p,i,t Otherwise, P sal,i,t =P a,i,t +P a,j,t -P p,j,t +P lea,i,t .

[0049] The beneficial effects of the present invention are: First, for new energy stations with large single-unit power generation, a new energy station self-distributed energy storage sharing alliance architecture is constructed. Secondly, considering factors such as green certificate income, transmission costs, and energy storage system loss costs, a new energy station sharing alliance revenue model is established. Finally, combined with the sharing alliance architecture, an operating mechanism for the new energy station self-distributed sharing alliance is established. The present invention takes new energy stations with large single-unit power generation and their self-distributed energy storage as research objects, establishes an operating method for the new energy station self-distributed energy storage sharing alliance, which can effectively improve the utilization rate of self-distributed energy storage, while improving the economic efficiency of new energy station operation, and has important engineering application value for promoting the consumption of renewable energy.

[0050] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0052] Figure 1 A flowchart of the operation method of a new energy site self-equipped energy storage sharing alliance;

[0053] Figure 2 Planned output and actual output for new energy stations;

[0054] Figure 3 Provide a self-equipped energy storage sharing alliance architecture for new energy sites;

[0055] Figure 4 For scenario 1: planned output < actual output;

[0056] Figure 5 This is scenario three: planned output > actual output. DETAILED DESCRIPTION

[0057] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0058] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0059] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0060] See also Figure 1 to Figure 5The present invention proposes an operation method of a new energy site self-distributed energy storage sharing alliance, which mainly includes three parts: a new energy site self-distributed energy storage sharing alliance architecture part, a new energy site self-distributed energy storage sharing alliance revenue model part and a new energy site self-distributed energy storage sharing alliance operation mechanism part.

[0061] Combination Figure 1 The operation method and implementation steps of the proposed new energy station self-equipped energy storage sharing alliance are described in detail. For new energy stations with large single power generation, an L 1 Wind farm and L 2 The number of wind farms participating in the alliance is n. x , the number of photovoltaic power stations is n y , satisfying 0≤n x ≤L 1 , 0≤n y ≤L 2 The effectiveness of the present invention is illustrated by a calculation example. The shared alliance stations in the calculation example are: 2 wind farms WT1 and WT2 and 1 photovoltaic power station PV, whose rated power generation is 600, 400, and 300MW respectively; the planned output and actual output of the stations are shown in Figure 2 Each station configures an energy storage system according to 20% of the installed capacity and a duration of 1h; the charging and discharging efficiencies of the self-equipped energy storage at each station are 0.9 and 0.95 respectively; the energy storage state of charge SOC max and SOC min 95% and 20% respectively, and the initial state of charge is 70%; the grid-connected electricity price is 300 yuan / (MW·h), and the unit cost coefficient of energy storage charging and discharging is ξ ins,i,t is 50 yuan / (MW·h), and the transmission cost coefficient ξ tc,i,t It is 100 yuan / (MW·h), and the scheduling time interval Δt is 15 minutes.

[0062] Step 1: New energy station self-equipped energy storage sharing alliance architecture part.

[0063] according to Figure 3 The new energy station self-equipped energy storage sharing alliance architecture shown in the figure confirms that there are L 1 = 2 wind farms and L 2 =1 photovoltaic power station; the dispatching center coordinates and manages the new energy stations in the shared energy storage alliance based on the monitoring data of the investment flow, energy flow, information flow and capital flow of the new energy stations.

[0064] Step 2: New energy station self-distribution sharing alliance revenue model part.

[0065] The dispatch center calculates the revenue of the new energy station self-distributed energy storage sharing alliance according to equations (1) to (9), where the on-grid electricity price is 300 yuan / (MW·h), the unit cost coefficient of energy storage charging and discharging is 50 yuan / (MW·h), and the transmission cost coefficient is 100 yuan / (MW·h). It is necessary to combine the operation mechanism of the new energy station self-distributed sharing alliance in step 3 to calculate the total alliance revenue and station revenue.

[0066] Step 3: New energy station self-distribution sharing alliance operation mechanism.

[0067] According to the proposed operation method of the new energy station self-equipped energy storage sharing alliance, Figure 4 and Figure 5 As shown in Table 1, combined with the self-equipped energy storage revenue model of the new energy station in step 2, the total alliance revenue and station revenue under different alliance modes are calculated, as shown in Table 1. It can be seen that the revenue of each station is different under different alliance modes. When the alliance mode is {1,2,3}, the total revenue of each station participating in the sharing alliance is the highest, which is 1.4889 million yuan; WT1, WT2, and PV have the highest revenue. Obviously, each station is more willing to choose alliance mode 5, that is, alliance mode {1,2,3}, which is more stable and economical than other alliance modes.

[0068] Table 1 Total alliance revenue and station revenue under different alliance modes

[0069] Serial number Alliance Total alliance revenue / 10,000 yuan WT1 income / 10,000 yuan WT2 income / 10,000 yuan PV income / 10,000 yuan 1 {{1},{2},{3}} 135.67 57.83 36.26 41.58 2 {{1},{2,3}} 138.11 57.83 38.57 41.71 3 {{1,2},{3}} 138.28 58.88 37.82 41.58 4 {{1,3},{2}} 142.95 61.73 36.26 44.96 5 {1,2,3} 148.89 63.54 39.49 45.86

[0070] In summary, the operating method of the self-distributed energy storage sharing alliance of new energy stations proposed in the present invention can effectively improve the utilization rate of self-distributed energy storage, while improving the economic efficiency of the operation of new energy stations, and has important engineering application value for promoting the consumption of new energy.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for operating a new energy site self-distributed energy storage sharing alliance, characterized by: The method comprises the following steps: For new energy stations with large single-unit power generation, a new energy station self-distributed energy storage sharing alliance architecture is established; Considering the green certificate income, transmission costs and energy storage system loss costs, a new energy station sharing alliance income model is established; Combined with the shared alliance architecture, a new energy station self-distribution shared alliance operation mechanism will be established.

2. The method for operating a new energy station self-distributed energy storage sharing alliance according to claim 1, characterized in that: The new energy station self-distributed energy storage sharing alliance architecture includes a power grid dispatching center and multiple new energy stations with self-distributed energy storage systems.

3. The method for operating a new energy station self-distributed energy storage sharing alliance according to claim 1, characterized in that: The new energy station sharing alliance revenue model includes a shared alliance revenue model and a new energy station revenue model; wherein the new energy station refers to photovoltaic power stations and wind farms.

4. The method for operating a new energy station self-distributed energy storage sharing alliance according to claim 3, characterized in that: The shared alliance revenue model specifically includes: In the formula, I is the shared alliance income, T is the total time period; I t is the income of the alliance in period t; In the formula, I i,t,PV and I i,t,W are the revenues of photovoltaic power station i and wind farm i in period t respectively; The new energy station revenue model specifically includes: I i,t =I sal,i,t +I cept,i,t +I de,i,t -I tc,i,t -I esc,i,t (3) In the formula, I i,t is the revenue of new energy station i in period t, I sal,i,t I is the income from electricity sales; cept,i,t I is the income from carbon emission rights; de,i,t To reduce the benefits of wind / solar abandonment penalties; I tc,i,t is the transmission cost; I esc,i,t Energy storage loss cost; ① The revenue from electricity sales is: I sal,i,t =P sal,i,t x sal,x Δt (4) Where P sal,i,t is the electricity sales power; sal,x is the electricity price sold at the site, x is W or PV; Δt is the transaction time interval; ② The income from green certificates is: I green,i,t =X i,t x g,i,t (5) Where, X i,t and g,i,t They are the number of green certificates and the price of green certificates respectively; ③The transmission cost is: I tc,i,t =ξ tc,i,t P sal,i,t Δt (6) In the formula, ξ tc,i,t is the cost coefficient of transmission line loss; ④The loss cost of the energy storage system is: I esc,i,t =E i,t x L x ins,i,t Δt (7) In the formula, E i,t is the total charge and discharge capacity; ins,i,t is the unit cost coefficient of energy storage charging and discharging; ξ L is the life loss cost coefficient of the energy storage system, 0≤ξ L ≤1; ⑤ The benefits of reducing the penalty for wind / solar abandonment are: Where P p,i,t and P a,i,t are the planned power generation and actual power generation of station i in period t respectively; P lea,i,t It is the charging and discharging power of the alliance station’s self-allocated energy storage during period t.

5. The method for operating a new energy station self-distributed energy storage sharing alliance according to claim 1, characterized in that: The operating mechanism of the new energy station self-distribution sharing alliance is as follows: Based on the data of operating parameters, energy storage capacity and state of charge (SOC) of new energy stations, the operation scenarios are divided according to the planned output and actual output of the stations, and the operation mechanism of the new energy station self-distributed energy storage sharing alliance based on the division of operation scenarios is proposed, which is as follows: ①Scene 1 is P p,i,t <P a,i,t , indicating that the power generation of station i in period t is in excess, SOC max and SOC min They are the maximum and minimum values ​​of the energy storage state of charge; SOC own and SOC lea They are the self-storage SOC of station i and the energy storage SOC of alliance stations; The charging and discharging capacity of the self-provisioned energy storage at station i is: Where P own,i,t is the charging and discharging power of the self-allocated energy storage of station i at time t; The energy storage SOC of the alliance station is: In the formula, E j,t The remaining energy stored in the alliance station at time t, E j,se Allocate capacity for energy storage batteries at alliance sites; 1) When SOC own =SOC max When SOC lea ≥SOC max , the output of station i is the planned output, that is, P sal,i,t =P p,i,t ;otherwise , station i provides charging power to the alliance’s self-distributed energy storage, that is, P sal,i,t =P p,i,t +P lea,i,t ;P lea,i,t The charging and discharging power of the alliance station's self-allocated energy storage during period t; 2) When SOC min <SOC own <SOC max When station i provides charging power to the self-distributed energy storage, if station i has surplus output and SOC lea ≥SOC max , that is, P sal,i,t =P p,i,t , the station should reduce power operation; otherwise, station i provides paid charging power to the alliance's self-distributed energy storage, that is, P sal,i,t =P p,i,t +P lea,i,t ; 3) When SOC own =SOC min When station i provides charging power to the self-distributed energy storage, that is, P sal,i,t =P p,i,t ; ②Scene 2 is P p,i,t =P a,i,t , indicating that the actual output of station i in period t is equal to the planned output. At this time, the output of station i is the planned output, that is, P sal,i,t =P p,i,t ; ③Scene 3 is P p,i,t >P a,i,t , indicating that the power generation of station i in period t is insufficient, the operation mechanism is divided by the SOC state of the station's self-equipped energy storage; when SOC min <SOC own ≤SOC max When P p,i,t -P a,i,t ≤P own,i,t , the station's self-equipped energy storage can completely make up for the power shortage, and the output of station i is the planned output, that is, P sal,i,t =P p,i,t ;otherwise , judge the power generation status of the alliance station; if P p,j,t >P a,j,t , the output of station i is the actual output, that is, P sal,i,t =P a,i,t ;otherwise , to determine whether the alliance station can fully make up for the power shortage; if P p,i,t -P a,i,t -P own,i,t ≤P a,j,t -P p,j,t , the output of station i is the planned output, that is, P sal,i,t =P p,i,t ;otherwise , determine the charge state of the alliance energy storage; if SOC lea <SOC min , that is, P sal,i,t =P p,i,t -P own,i,t ;otherwise , determine whether the alliance energy storage can make up for the power shortage; if P p,i,t -P a,i,t -P own,i,t -(P a,j,t -P p,j,t )≤P lea,i,t , the alliance energy storage can fully make up for the power shortage, that is, P sal,i,t =P p,i,t ;otherwise , P sal,i,t =P a,i,t +P a,j,t -P p,j,t +P lea,i,t ; When SOC own =SOC min When P p,j,t >P a,j,t , the output of station i is the actual output, that is, P sal,i,t =P a,i,t ;otherwise , to determine whether the alliance station can fully make up for the power shortage; if P p,i,t -P a,i,t ≤P a,j,t -P p,j,t , the output of station i is the planned output, that is, P sal,i,t =P p,i,t ;otherwise , determine the charge state of the alliance energy storage; if SOC lea <SOC min , that is, P sal,i,t =P a,i,t +P p,j,t -P a,j,t ;otherwise , determine whether the alliance energy storage can make up for the power shortage; if P p,i,t -P a,i,t -(P a,j,t -P p,j,t )≤P lea,i,t , the alliance energy storage can fully make up for the power shortage, that is, P sal,i,t =P p,i,t ;otherwise ,P sal,i,t =P a,i,t +P a,j,t -P p,j,t +P lea,i,t 。

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