Method for coordinated clearing of inter-provincial trade of surplus regulation power of pumped storage power station

Abstract

The present application relates to a kind of pumped storage power station excess regulation electric quantity inter-provincial transaction collaborative clearing method, comprising the following steps: S1, the time-sharing "power-price" curve of each pumped storage power station and market member declaration is collected, and electric quantity is checked;S2, excess power generation transaction model and excess pumping transaction model are constructed to independently pre-clearing, obtain the pre-transaction electric quantity curve of each pumped storage power station and non-pumped storage body;S3, excess regulation electric quantity collaborative clearing model is constructed, with the weighted deviation of minimum and pre-clearing result as target, realize the transaction reduction of market rule;S4, the final transaction electric quantity of each pumped storage power station and non-pumped storage body, cross-provincial passage tidal current and unified marginal electric price are obtained, and after being pushed to dispatching agency for safety check, transaction result is announced.The present application can realize the collaborative clearing of excess power generation and excess pumping transaction, and provide an engineering-implementation scheme for efficient allocation of regional regulatory resources.

Description

Technical Field

[0001] This invention relates to the field of electricity market trading technology, and more specifically, to a collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations. Background Technology

[0002] With the integration of a high proportion of renewable energy, the demand for flexible resource regulation in the power system is becoming increasingly urgent. Pumped storage power stations, with their rapid response capabilities and large-capacity energy storage characteristics, have become a key means to support power balance and promote the consumption of new energy. In regional power grids, the regulatory resource endowments of different provinces vary. Achieving cross-provincial sharing of the regulatory capacity of pumped storage power stations through inter-provincial market transactions is an important way to optimize resource allocation and reduce system operating costs.

[0003] To standardize the inter-provincial medium- and long-term trading of surplus regulation power from pumped storage power stations, some regional market rules have proposed clear trading mechanisms: pumped storage power stations participate in two types of transactions as both wholesale users and power generation enterprises—in surplus power generation transactions, they act as sellers (considered power generation enterprises), selling their surplus power generation capacity to grid companies or power generation enterprises in other provinces through inter-provincial channels; in surplus pumped water transactions, they act as buyers (considered wholesale users), purchasing electricity from power generation enterprises in other provinces for pumping. The transactions adopt a "bilateral quantity and price quotation, multi-channel centralized bidding, and unified marginal price clearing" model. Buyers and sellers independently submit time-of-use "electricity-price" curves, and a unified marginal price is formed through centralized bidding. Simultaneously, the market rules impose the following restrictions: the same pumped storage power station cannot act as both a buyer and seller in the same trading period; pumped storage power stations within the same node cannot act as both buyers and sellers in the same trading period. Furthermore, to ensure that inter-provincial transactions do not affect intra-provincial pumped storage regulation, the total pumping power to the total generating power of each pumped storage power station must meet a 4:3 ratio during the trading cycle to ensure that inter-provincial transactions are paired. Therefore, the market transactions are organized through a process of "power verification - independent pre-clearing - coordinated clearing." During the coordinated clearing phase, any portion that does not meet the 4:3 ratio of pumping power to generating power is reduced according to priority.

[0004] However, existing inter-provincial transaction simulation methods have the following shortcomings when dealing with the above rules: First, they fail to incorporate the dual role mutual exclusion constraint of pumped storage power stations and the 4:3 ratio constraint of pumping and power generation into the clearing model, which may lead to clearing results that violate market rules and are difficult to guide practical applications; Second, when the pre-clearing results do not meet the market rule restrictions, there is a lack of a collaborative optimization mechanism to reduce the pre-clearing results according to the transaction priority under the premise of ensuring the physical feasibility of inter-provincial channels, making it difficult to achieve fair reduction according to the priority required by the rules. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a collaborative clearing method for inter-provincial trading of surplus regulation power from pumped storage power stations. This method can achieve collaborative clearing of surplus power generation and surplus pumping under the premise of satisfying the dual identity mutual exclusion constraint of pumped storage power stations, the 4:3 ratio constraint of pumping and power generation, and the physical limitations of inter-provincial channels. Furthermore, it can reduce transactions when market constraints are not met by using a weighted deviation minimization strategy based on principal priority.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations, comprising the following steps: S1. Collect grid operation boundary data of the time-of-use "electricity-price" curve submitted by each pumped storage power station and market member, and verify the electricity volume; S2. Based on the verified application data, construct surplus power generation trading model and surplus pumped water trading model respectively for independent pre-clearing to obtain the pre-transaction power curves of each pumped storage power station and non-pumped storage entity. S3. Using the independent pre-clearing results as initial values, construct a collaborative clearing model for surplus regulation power, including a 4:3 ratio constraint between pumping and power generation, mutual exclusion constraints between individual and provincial roles, system power balance constraints, and inter-provincial channel capacity constraints. The goal is to minimize the weighted deviation from the pre-clearing results, and to achieve transaction reduction according to market rules through priority weight coefficients and proportional reduction constraints. S4. Solve the collaborative clearing model to obtain the final transaction volume, inter-provincial power flow, and unified marginal electricity price of each pumped storage power station and non-pumped storage entity. Then, push the results to the dispatching agency for safety verification and announce the transaction results.

[0007] According to the above scheme, in step S1, the time-of-use "electricity-price" curves and grid operation boundary data reported by each pumped storage power station and market member include: province set I, time period set T; inter-provincial channel set L, and transmission capacity of channel l. , and the existing power transmission capacity of inter-provincial channels .

[0008] According to the above scheme, in step S2, based on the application data verified in step S1, surplus power generation trading sub-problem P1 and surplus pumping trading sub-problem P2 are constructed respectively, and independent pre-clearing is carried out to obtain pre-transaction curves Q1 and Q2. Specifically, the steps are as follows: S201. Pumped storage power stations participate only as electricity sellers, while the electricity buyers are grid companies and power generation companies. The buyers and sellers bid centrally, and the matching is based on the "electricity-price" curves declared by the buyers and sellers in different provinces to form a pre-transaction curve for surplus power generation transactions. S202. Pumped storage power stations participate only as power purchasers, while power generation companies are the power sellers. The purchasers and sellers bid centrally, and the matching is based on the "electricity-price" curves declared by both parties to form a pre-transaction curve for surplus pumped storage transactions.

[0009] According to the above scheme, in step S201, The electricity volume transacted by electricity seller k in time segment n during time period t is ,satisfy

[0010] The electricity volume transacted by the electricity purchaser in the bidding segment m during the time period t is: ,satisfy .

[0011] According to the above scheme, in step S202, The electricity volume transacted by electricity seller w in time segment n during time period t is ,satisfy

[0012] The electricity volume transacted by buyer k in time segment m during time period t is ,satisfy .

[0013] According to the above scheme, in step S3, the pre-transaction curves Q1 and Q2 obtained in step S2 are used as initial values ​​to construct a collaborative clearing model, adding a 4:3 ratio constraint between pumping and power generation and other constraints. For the part that does not meet the 4:3 ratio between pumping and power generation, the transaction is reduced according to the transaction priority, and the same priority is reduced proportionally.

[0014] According to the above scheme, in step S3, for each pumped storage power station k, when the total transaction volume of pumping and power generation does not meet the ratio of 4:3 during the trading period, the excess pumping or power generation volume is reduced as needed, and the reduction amount for each period and the corresponding reduction amount for the power seller or power buyer are determined. According to the above scheme, in step S3, the model constraints include: The 4:3 ratio constraint between pumped water and generated electricity means that for each pumped storage power station k, the total inter-provincial pumped water volume and total generated electricity volume must meet the following requirements within the trading cycle:

[0015] The dual-role constraint of pumped storage power stations means that each pumped storage power station cannot act as both a buyer and a seller of electricity during the same trading period.

[0016] in For a sufficiently large positive number, k can be taken as twice the rated power of the pumped storage power station; At the provincial level, there is a dual-role constraint: no pumped storage power station within the same node can act as both a buyer and seller of electricity during the same trading period.

[0017] in, For a sufficiently large positive number, it can be the sum of the rated power of all pumped storage power stations in province i.

[0018] According to the above scheme, in step S3, the constraints are reduced proportionally: To achieve the principle that "transactions of the same priority should be reduced proportionally in principle," a proportional reduction constraint is introduced. Market participants with the same priority weight are grouped into the same priority group, and a proportional factor is introduced for each priority group R. The final transaction volume of all entities within the group in each time period maintains the same ratio as their pre-cleared volume:

[0019] in, , These represent the reduction ratio factors for non-pumped storage power purchasers and power sellers in priority group R, respectively. , Let R represent the sets of non-pumped storage power purchasers and power sellers in priority group R, respectively.

[0020] According to the above scheme, in step S4, the collaborative clearing result obtained in step S3 is pushed to the regional power dispatching agency for safety verification. After the safety verification is passed, the regional power trading agency announces the transaction results to the relevant operating entities through the power trading platform. The transaction price is the clearing price, the transaction volume is the volume that has passed the safety verification, and the transaction curve is the time-of-use transaction curve that has passed the safety verification.

[0021] The collaborative clearing method for inter-provincial trading of surplus regulated electricity from pumped storage power stations, as described in this invention, has the following beneficial effects: 1. This invention constructs a two-stage optimization framework of "independent pre-clearing - collaborative clearing," which decomposes complex market rules into computable sub-problems. In the independent pre-clearing stage, surplus power generation transactions and surplus pumping transactions are solved separately to obtain the pre-transaction curves of each market participant. In the collaborative pre-clearing stage, under the premise of satisfying the 4:3 ratio constraint, dual role mutual exclusion constraint, and cross-provincial channel physical constraint, collaborative optimization is carried out according to the transaction priority with the goal of minimizing the weighted deviation from the pre-clearing result. This not only ensures a high degree of fit with market rules, but also reduces the model solution complexity through staged processing, solving the technical problem that multiple complex constraints are difficult to model simultaneously in the prior art. 2. This invention introduces a weighted deviation minimization objective function based on principal priority into the collaborative clearing model. By setting priority weight coefficients, it achieves precise control over transaction reduction. When the pumped water and power generation of a pumped storage power station do not meet the 4:3 ratio, the model automatically selects the reduction scheme that minimizes the increase in the objective function—prioritizing the reduction of the transaction volume of the principal with lower priority in the corresponding time period, while the reduction amount is shared equally among the principals with the same priority. This achieves the requirement of "reduction according to transaction priority" as required by the rules, while avoiding complex transaction pair matching modeling, and has good engineering practicality. 3. In the collaborative pre-clearing model, this invention explicitly constructs dual role mutual exclusion constraints at the individual level and the provincial level; the dual role mutual exclusion constraints of pumped storage power stations ensure that each pumped storage power station cannot generate electricity and pump water at the same time; the dual role mutual exclusion constraints at the provincial level ensure that all pumped storage power stations in the same province act in a consistent manner at the same time; this constraint system transforms the normative requirements of market rules on the behavior of subjects into computable mathematical expressions, effectively ensuring the market compliance of the clearing results. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a flowchart of the collaborative clearing method for inter-provincial trading of surplus regulated electricity in pumped storage power stations according to the present invention. Figure 2 This is a stacked diagram of the reported amounts of each province in the inter-provincial trading of surplus regulation electricity according to the present invention. Figure 3 This is a time sequence diagram of the pre-transactional electricity volume in the pre-clearing of pumped storage power station C_P2 in Province C of this invention; Figure 4 This is a time series diagram of the traded electricity volume after the optimized collaborative clearing of pumped storage power station C_P2 in Province C of this invention; Figure 5 This is a comparison chart of the reduction in new energy electricity sales in Province C before and after the present invention; Figure 6 This is a provincial trading balance diagram of surplus regulation electricity from pumped storage power stations after collaborative clearing according to the present invention. Figure 7 This invention relates to an inter-provincial electricity price chart for surplus regulation power in pumped storage power stations. Detailed Implementation To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] like Figure 1-7 As shown, the collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to the present invention includes the following steps: S1. Market Data Collection and Verification Collect time-of-use electricity-price curves and grid operation boundary data submitted by each market participant, and perform electricity volume verification. This includes: Province set I, time period set T (Δt = 1 hour); inter-provincial corridor set L, transmission capacity of corridor l. , Since inter-provincial surplus electricity trading based on energy storage is a supplement to other medium- and long-term inter-provincial transactions, it is necessary to determine the already utilized transmission capacity of each inter-provincial corridor when conducting the transactions. .

[0024] In surplus power generation transactions, the tiered bidding submitted by pumped storage power station k in province i of the power seller. Each price range n corresponds to the declared electricity volume. and declared price And it satisfies the monotonically non-decreasing constraint. The set of tiered bids submitted by the power grid companies and power generation companies w in province i, the power purchaser. Each quotation segment m corresponds to the declared electricity volume. and declared price And it satisfies the monotonically non-increasing constraint. .

[0025] In surplus water pumping transactions, the tiered pricing submitted by power generation companies w in province i (the electricity seller) Each price range n corresponds to the declared electricity volume. and declared price And it satisfies the monotonically non-decreasing constraint. The tiered bid set submitted by the power purchaser for the pumped storage power station k Each quotation segment m corresponds to the declared electricity volume. and declared price And it satisfies the monotonically non-increasing constraint. .

[0026] Inter-provincial surplus electricity trading of pumped storage power stations must be carried out on the premise of meeting the operating needs of the power station itself and the power balance of the province. The electricity curve of the surplus electricity trading declaration of the pumped storage power station needs to be verified and shall not exceed the upper limit of the power station's surplus power generation or surplus pumping power.

[0027] S2: Construction and Solution of Independent Pre-Clearing Model Based on the application data verified in step S1, sub-problems P1 for surplus power generation trading and P2 for surplus pumping trading are constructed respectively, and independent pre-clearing is carried out to obtain pre-transaction curves Q1 and Q2.

[0028] S201, Pre-clearing of surplus power generation transactions Pumped storage power stations participate only as electricity sellers, while electricity buyers are grid companies and power generation companies (excluding pumped storage power stations). The buyers and sellers bid centrally, and the matching is based on the "electricity-price" curves declared by the buyers and sellers in different provinces to form a pre-transaction curve for surplus power generation transactions.

[0029] The electricity volume transacted by electricity seller k in time segment n during time period t is ,satisfy

[0030] The electricity volume transacted by the electricity purchaser in the bidding segment m during the time period t is: ,satisfy

[0031] To maximize social welfare, a linear programming clearing model is constructed. The objective function is:

[0032] in, For province i, this is the set of electricity purchasers participating in surplus power generation trading. For province i, the set of electricity sellers participating in surplus power generation transactions.

[0033] System power balance constraints:

[0034] Solving this model yields the pre-transactional electricity volume for surplus power generation trading at each pumped storage power station. The summation yields the pre-sale curve Q1 for pumped storage power stations:

[0035] Obtain the pre-transaction volume of surplus power generation from each power purchaser. The summation yields the pre-sale curve Q1 for the electricity purchaser:

[0036] S202, Pre-clearing of surplus water pumping transactions Pumped storage power stations participate only as electricity purchasers, while electricity sellers are power generation companies (excluding pumped storage power stations). The purchasers and sellers bid centrally, and the matching is based on the "electricity-price" curves declared by both parties to form a pre-transaction curve for surplus pumped storage transactions.

[0037] The electricity volume transacted by electricity seller w in time segment n during time period t is ,satisfy

[0038] The electricity volume transacted by buyer k in time segment m during time period t is ,satisfy

[0039] To maximize social welfare, a linear programming clearing model is constructed. The objective function is:

[0040] in, For province i, the set of electricity sellers participating in surplus water pumping transactions. This refers to the set of electricity purchasers in province i who participate in surplus water pumping transactions.

[0041] System power balance constraints:

[0042] Solving this model yields the pre-transactional electricity volume for surplus power generation trading at each pumped storage power station. The summation yields the pre-sale curve Q2 for pumped storage power stations:

[0043] Obtain the pre-transaction volume of surplus power generation from each power purchaser. The summation yields the pre-sale curve Q2 for the electricity purchaser:

[0044] S3. Construction and Solution of Collaborative Clearing Model Using the pre-transaction curves Q1 and Q2 obtained in step S2 as initial values, a collaborative clearing model is constructed, adding a 4:3 ratio constraint between pumping and power generation and other constraints. For the portion that does not meet the 4:3 ratio of pumping and power generation, transactions are reduced according to transaction priority.

[0045] For each pumped-storage power station k, when the total transaction volume of pumped water and generated water does not meet the 4:3 ratio during the trading period, the excess pumped water (or generated water) volume needs to be reduced as required. The reduction amount for each period and the corresponding reduction amount for the seller (or buyer) need to be determined. To simplify the clearing process, the results of independent pre-clearing are decoupled; in collaborative clearing, it is not necessary to locate the trading pair, and re-matching can be performed after the reduction amount is determined.

[0046] The model decision variables include: : The final electricity generated by pumped storage power station k in province i during time period t (surplus power generation transaction). : The final pumping power volume (surplus pumping transaction) of pumped storage power station k in province i during time period t. The final electricity purchase transaction volume (surplus power generation transaction) of the non-pumped storage power purchase entity w in province i during time period t. The final electricity sales volume (surplus pumped storage transaction) of non-pumped storage electricity sales entity w in province i during time period t. The overall power flow of channel l in time period t (generated by both types of transactions); : The pumping status indicator of pumped storage power station k in time period t, where 1 indicates power generation and 0 indicates pumping; : The pumping status identifier of all pumped storage power stations in province i during time period t. 1 indicates that the pumped storage in the province participates in inter-provincial surplus power generation transactions, and 0 indicates that the pumped storage participates in inter-provincial surplus pumping transactions.

[0047] The objective function is optimized in multiple ways while satisfying the proportional constraints: (1) minimizing the deviation between the collaborative clearing result and the independent pre-clearing result; (2) reducing the amount of cash according to transaction priority.

[0048] in, , , , This is the priority weighting coefficient; a larger value indicates that the entity's transactions are given higher priority during that period. The weighting coefficient for pumped storage power stations ensures that the deviation between the collaborative clearing result and the independent pre-clearing result is minimized. The weights of trading entities for non-pumped storage power stations can be determined based on the following factors: the principle of clean energy priority (if the power purchaser or seller w is a clean energy power generation enterprise, its weight is larger), the principle of price priority (in independent pre-clearing, the power purchaser with the higher price or the power seller with the lower price has a larger weight), and special periods (such as when the power purchaser is in a guaranteed power supply period, its weight is larger).

[0049] Model constraints include: The 4:3 ratio constraint between pumped water and generated electricity means that for each pumped storage power station k, within a trading cycle (e.g., monthly, ten-day, weekly), its total inter-provincial pumped water volume and total generated electricity volume must meet the following requirements:

[0050] The dual-role constraint of pumped storage power stations means that each pumped storage power station cannot act as both a buyer and a seller of electricity during the same trading period.

[0051] in For a sufficiently large positive number, k can be taken as twice the rated power of the pumped storage power station.

[0052] At the provincial level, there is a dual-role mutual exclusion constraint: within the same node (province), all pumped storage power stations cannot act as both electricity buyers and sellers during the same trading period.

[0053] in For a sufficiently large positive number, it can be the sum of the rated power of all pumped storage power stations in province i.

[0054] Battery level upper and lower limits constraints:

[0055]

[0056] System power balance constraints: In surplus power generation transactions, the total purchased electricity volume of non-pumped storage power purchase entities should be equal to the total traded electricity volume of pumped storage power generation:

[0057] In surplus pumped water transactions, the total electricity sold by non-pumped storage power sellers should equal the total transaction volume of pumped storage power.

[0058] Inter-provincial corridor capacity constraints In inter-provincial surplus electricity trading, the power flow changes generated in each inter-provincial corridor are jointly determined by the trading results of pumped storage power generation, pumped hydropower, and other entities. This is calculated by introducing a power flow transfer factor:

[0059] in , These are the power generation factors of pumped storage power station k and the power flow transfer factors of pumping to channel l, respectively. , These are the power flow transfer factors for the non-pumped storage entity w generating and purchasing power in province i, respectively, and channel l.

[0060] The capacity constraint for inter-provincial channels is:

[0061] in This refers to the background current generated by inter-provincial transactions on channel l.

[0062] Provincial balance constraints: For each province i, considering the net injection from pumped storage and other entities, balance with the power flow of the connecting lines:

[0063] in , These are the sets of channels for inflow and outflow from province i, respectively.

[0064] Proportional reduction constraint: To achieve the principle that "transactions of the same priority should be reduced proportionally in principle," this model, based on the electricity constraint, further introduces a proportional reduction constraint. Market participants with the same priority weight are grouped into the same priority group, and a proportional factor is introduced for each priority group R. The final transaction volume of all entities within the group in each time period maintains the same ratio as their pre-cleared volume:

[0065] in , These represent the reduction ratio factors for non-pumped storage power purchasers and power sellers in priority group R, respectively. , Let R represent the sets of non-pumped storage power purchasers and sellers in priority group R, respectively. This constraint ensures that all market participants within the same priority group bear the reduction in proportion. Meanwhile, the model maintains a linear programming form for ease of solution.

[0066] Solving the above-mentioned collaborative clearing model for surplus power regulation yields the optimal values ​​of each decision variable. Based on the duality theory of linear programming, the unified marginal electricity price for each time period of surplus power generation trading and surplus pumping trading is extracted using the Lagrange multipliers corresponding to the system's power balance constraints. .

[0067] The output results include: the time-of-use power generation and pumping power transaction volume of each pumped storage power station. , Electricity purchase and sale transactions of various non-pumped storage entities , Unify marginal electricity prices.

[0068] S4: Safety Verification and Results Announcement The coordinated clearing result obtained in step S3 is pushed to the regional power dispatching agency (grid dispatching) for safety verification. After the safety verification is passed, the regional power trading agency publishes the transaction results to the relevant operators through the power trading platform. Among them, the transaction price is the clearing price, the transaction volume is the volume that has passed the safety verification, and the transaction curve is the time-of-use trading curve that has passed the safety verification.

[0069] Example This embodiment takes provinces A, B, and C of a certain regional power grid as an example to illustrate the specific implementation process and technical effects of the cross-provincial collaborative clearing method for surplus power from pumped storage power stations proposed in this invention. The installed capacities of various types of generating units in the three provinces are shown in Table 1. The forward and reverse transmission power limits of inter-provincial transmission channels AB, BC, and AC are all 7 million kilowatts. Based on the power balance forecast results of each province on a typical day, the inter-provincial declared electricity volume and declared price (affected by the provincial electricity price and generation cost) of each market participant are generated, where the declared electricity volume of each type of generating unit is as follows: Figure 2 As shown.

[0070] Table 1. Power System Installed Capacity (Unit: 10,000 kW / 10,000 kWh)

[0071] Independent pre-clearing results: According to step S2, the surplus power generation trading sub-problem P1 and surplus pumping water trading sub-problem P2 are constructed separately for independent pre-clearing. The pre-clearing results of surplus power generation trading are shown in Table 2, and the pre-clearing results of surplus pumping water trading are shown in Table 3. Figure 3 The pre-transaction volume curve of pumped storage power station C_P2 in province C is shown.

[0072] Table 2 Pre-clearing Results of Surplus Power Generation Trading

[0073] Table 3. Pre-clearing results of surplus water pumping transactions

[0074] As shown in Tables 2 and 3, after independent pre-clearing, the total pre-transactional power generation of all pumped storage power stations in the region is 42,200 MWh, and the total pre-transactional pumping volume is 37,595 MWh. The ratio of pumped water to power generation at each pumped storage power station generally deviates from 4:3. For example, in Province A, pumped storage power generation is far higher than pumped water, while in Province B, the opposite is true. This does not conform to the market rules requiring reservoir capacity balance for pumped storage power stations and may affect the provincial regulation capacity of pumped storage power stations in subsequent periods.

[0075] Collaborative clearing and transaction reduction: According to step S3, using the pre-transaction curve obtained from independent pre-clearing as the initial value, a collaborative clearing model is constructed. This model adds a 4:3 ratio constraint between pumped storage and power generation (i.e., the ratio of total pumped storage power to total power generation for each pumped storage power station is 4:3), mutual exclusion constraints at both the individual and provincial levels, and capacity constraints for inter-provincial channels. Any portions that do not meet these constraints are reduced according to transaction priority. The inter-provincial transaction results for pumped storage power stations after collaborative clearing are shown in Table 4.

[0076] Comparing Tables 2, 3, and 4, it can be seen that after the coordinated clearing process, the total generated electricity from all pumped storage power stations in the region was 16638.8 MWh, and the total pumped electricity was 22185.1 MWh. The ratio of pumped electricity to generated electricity for each pumped storage power station strictly met the 4:3 requirement. Taking pumped storage power station C_P2 in Province C as an example, its pre-cleared pumped electricity was 3425 MWh, and its generated electricity was 3750 MWh (ratio approximately 0.91). After the coordinated clearing process, the pumped electricity remained unchanged, while the generated electricity was adjusted to 2568.8 MWh, with a ratio of 1.33. Figure 4 This shows the transaction situation of inter-provincial surplus regulation electricity after C_P2 was optimized for collaborative clearing, and compared with... Figure 3 As can be seen from the comparison, the power generation of the generating unit was reduced during certain periods, while the power output of the pumped water remained unchanged.

[0077] During the reduction process, because the trading parties adopt a decoupled model (i.e., only the total transaction volume of each entity is determined, and trading pairs are not pre-bound), each pumped storage power station only needs to be reduced to meet market rule constraints, without priority distinction. For non-pumped storage entities, reduction is carried out according to the set priority, with proportional reduction within the same priority. As can be seen from Table 4: Among the power purchasers, the amount of thermal power purchased by the lower-priority B province was reduced from 19,700 MWh to 2,664.8 MWh, a reduction of 86.5%; while the amount of power purchased by the higher-priority B province power grid companies was reduced from 7,500 MWh to 7,328.7 MWh, a reduction of only 2.3%.

[0078] Among the electricity sellers, the thermal power sales volume in Province A, which has a lower priority, was reduced from 26,650 MWh to 12,239.3 MWh, a reduction of 54.0%; while the renewable energy sales volume in Province C, which has a higher priority, was reduced from 8,445 MWh to 7,313.3 MWh, a reduction of only 13.4%.

[0079] Figure 5 The comparison of the reduction in electricity sales from new energy sources in Province C before and after the reduction shows that, due to the same priority, the electricity sales in each time period were reduced by the same proportion, verifying the implementation of the proportional reduction rule.

[0080] Table 4 Results of Inter-provincial Coordinated Clearing of Surplus Adjustment Electricity Transactions

[0081] After the coordinated clearing is completed, the balance of surplus regulation electricity among the three provinces is as follows: Figure 6 As shown in the figure, net electricity sales and net electricity purchases remain balanced across different time periods.

[0082] The clearing prices for surplus pumped water trading and surplus power generation trading at different time periods are as follows: Figure 7As shown in the figure, the zero-price period represents a period during which no transaction of this type was completed, and the non-price period is 0. It is evident that the electricity price for power generation transactions and pumped water transactions differs across different time periods, reflecting the impact of market supply and demand and priority reduction on prices.

[0083] This embodiment verifies the effectiveness of the present invention: in the independent pre-clearing stage, the pre-transaction curves of each entity can be obtained; in the collaborative clearing stage, by introducing a 4:3 ratio constraint, dual role mutual exclusion constraint and priority reduction mechanism, the final transaction volume of each pumped storage power station and each non-pumped storage entity can be formed under the premise of meeting market rules, thereby achieving the optimal allocation of surplus regulation volume between provinces.

[0084] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations, characterized in that, Includes the following steps: S1. Collect grid operation boundary data of the time-of-use "electricity-price" curve submitted by each pumped storage power station and market member, and verify the electricity volume; S2. Based on the verified application data, construct surplus power generation trading model and surplus pumped water trading model respectively for independent pre-clearing to obtain the pre-transaction power curves of each pumped storage power station and non-pumped storage entity. S3. Using the independent pre-clearing results as initial values, construct a collaborative clearing model for surplus regulation power, including the ratio constraints of pumping and power generation, the dual role mutual exclusion constraints at the individual and provincial levels, the system power balance constraints, and the inter-provincial channel capacity constraints. With the goal of minimizing the weighted deviation from the pre-clearing results, the market rules transaction reduction is achieved through priority weight coefficients and proportional reduction constraints. S4. Solve the collaborative clearing model to obtain the final transaction volume, inter-provincial power flow, and unified marginal price of each pumped storage power station and non-pumped storage entity. Then, push the results to the dispatching agency for safety verification and announce the transaction results.

2. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 1, characterized in that, In step S1, the time-of-use "electricity-price" curves and grid operation boundary data submitted by each pumped storage power station and market participant are collected, including: province set I, time period set T; inter-provincial channel set L, and transmission capacity of channel l. , and the existing power transmission capacity of inter-provincial channels .

3. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 1, characterized in that, In step S2, based on the application data verified in step S1, surplus power generation trading sub-problem P1 and surplus pumping trading sub-problem P2 are constructed respectively, and independent pre-clearing is performed to obtain pre-transaction curves Q1 and Q2. Specifically, the steps are as follows: S201. Pumped storage power stations participate only as electricity sellers, while the electricity buyers are grid companies and power generation companies. The buyers and sellers bid centrally, and the matching is based on the "electricity-price" curves declared by the buyers and sellers in different provinces to form a pre-transaction curve for surplus power generation transactions. S202. Pumped storage power stations participate only as electricity purchasers, while power generation companies are the electricity sellers. The purchasers and sellers bid centrally, and the matching is based on the "electricity-price" curves declared by both parties to form a pre-transaction curve for surplus pumped storage transactions.

4. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 3, characterized in that, In step S201 The electricity volume transacted by electricity seller k in time segment n during time period t is ,satisfy The electricity volume transacted by the electricity purchaser in the bidding segment m during the time period t is: ,satisfy 。 5. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 4, characterized in that, In step S202 The electricity volume transacted by electricity seller w in time segment n during time period t is ,satisfy The electricity volume transacted by buyer k in time segment m during time period t is ,satisfy 。 6. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 1, characterized in that, In step S3, the pre-transaction curves Q1 and Q2 obtained in step S2 are used as initial values ​​to construct a collaborative clearing model. The ratio constraint of 4:3 for pumping and power generation and other constraints are added. For the part that does not meet the 4:3 ratio of pumping and power generation, the transaction is reduced according to the transaction priority. The same priority is reduced proportionally.

7. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 6, characterized in that, In step S3, for each pumped storage power station k, when the total transaction volume of pumping and power generation does not meet the ratio of 4:3 during the trading period, the excess pumping or power generation volume is reduced as needed, and the reduction amount for each period and the corresponding reduction amount for the power seller or power buyer are determined.

8. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 6, characterized in that, In step S3, the model constraints include: The 4:3 ratio constraint between pumped water and generated electricity means that for each pumped storage power station k, the total inter-provincial pumped water volume and total generated electricity volume must meet the following requirements within the trading cycle: The dual-role constraint of pumped storage power stations means that each pumped storage power station cannot act as both a buyer and a seller of electricity during the same trading period. in For a sufficiently large positive number, k can be taken as twice the rated power of the pumped storage power station; At the provincial level, there is a dual-role constraint: no pumped storage power station within the same node can act as both a buyer and seller of electricity during the same trading period. in, For a sufficiently large positive number, it can be the sum of the rated power of all pumped storage power stations in province i.

9. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 8, characterized in that, In step S3, the constraint is reduced proportionally: To achieve the principle that "transactions of the same priority should be reduced proportionally in principle," a proportional reduction constraint is introduced. Market participants with the same priority weight are grouped into the same priority group, and a proportional factor is introduced for each priority group R. The final transaction volume of all entities within the group in each time period is kept in the same proportion to their pre-cleared volume: in, , These represent the reduction ratio factors for non-pumped storage power purchasers and power sellers in priority group R, respectively. , Let R represent the sets of non-pumped storage power purchasers and power sellers in priority group R, respectively.

10. The collaborative clearing method for inter-provincial trading of surplus regulation electricity from pumped storage power stations according to claim 1, characterized in that, In step S4, the collaborative clearing result obtained in step S3 is pushed to the regional power dispatching agency for safety verification. After the safety verification is passed, the regional power trading agency announces the transaction results to the relevant operators through the power trading platform. The transaction price is the clearing price, the transaction volume is the volume that has passed the safety verification, and the transaction curve is the time-of-use transaction curve that has passed the safety verification.

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