Inter-province centralized bidding clearing method supporting contract transfer and related device

Abstract

The invention belongs to the technical field of electric power automation, and discloses an inter-province centralized bidding clearing method supporting contract transfer and a related device. The inter-province centralized bidding clearing method supporting contract transfer comprises the following steps: establishing feasible transaction paths between all electricity selling nodes and electricity purchasing nodes according to electricity purchasing nodes and electricity selling nodes set by each province participating in inter-province multi-channel centralized clearing in combination with inter-province extra-high voltage channels and intra-province communication section information; and converting the electricity purchase declaration electricity price of a market subject serving as an electricity purchase role in a feasible transaction path, and taking social welfare maximization as a target function, and considering preset constraints to carry out inter-provincial multichannel centralized bidding optimization clearing supporting contract transfer. According to the technical scheme, the communication cost of market subjects can be reduced, and the utilization rate of extra-high-voltage channels is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power automation, and in particular relates to an inter-provincial centralized bidding and clearing method supporting contract transfer and a related device. Background Art

[0002] With the advancement of the construction of a unified national electricity market and the acceleration of the construction of a new power system, the transaction targets of the inter-provincial medium- and long-term market, which is the "ballast stone" for price stability and supply guarantee, are gradually developing in the direction of time-based, curve-based, and high-frequency, which requires more flexible and efficient contract curve adjustment methods. However, the current market players mainly use single-channel contract transfer, repurchase, replacement and other transaction methods to achieve this. The communication cost between market players is high and cannot meet the frequent adjustment needs of market players. It is urgent to study the trading mechanism that supports flexible adjustment needs.

[0003] In the current existing technical solutions, a provincial multi-channel centralized bidding and clearing software that takes into account the remaining available transfer capacity (ATC) of the channel has been developed, which has achieved the transition from single-channel organization to multi-channel centralized optimization of provincial medium- and long-term transactions. Its deployment and application have also effectively improved the efficiency of market operations. However, the above-mentioned optimized provincial medium- and long-term transactions still have the problems of high communication costs for market entities and low utilization rate of ultra-high voltage channels, and cannot support the needs of market entities to frequently adjust contracts due to the volatility of new energy or changes in inter-provincial purchase / sales demand; explanatory, the above-mentioned optimized provincial medium- and long-term transactions include two steps: bilateral negotiation and centralized trading. In the provincial multi-channel centralized bidding and clearing method used in centralized trading, the roles of each market entity are fixed, and market entities are not allowed to switch purchase and sale roles in a transaction. It also does not support simultaneous access to forward and reverse paths, and it is impossible to integrate bilateral negotiation and centralized trading. Therefore, when market entities frequently adjust bilateral negotiation contracts, there are problems of high communication costs and low utilization rate of ultra-high voltage channels. Summary of the invention

[0004] The purpose of the present invention is to provide a method and related device for inter-provincial centralized bidding and clearing that supports contract transfer, so as to solve one or more of the above-mentioned technical problems. The technical solution disclosed in the present invention is specifically a medium- and long-term inter-provincial centralized bidding and clearing solution that supports flexible contract adjustment. When market entities frequently adjust contracts, it can reduce the communication costs of market entities and improve the utilization rate of UHV channels.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides an inter-provincial centralized bidding and clearing method supporting contract transfer, comprising the following steps:

[0007] According to the power purchase nodes and power sales nodes set up by each province participating in the inter-provincial multi-channel centralized bidding and clearing, combined with the inter-provincial UHV channels and the provincial AC section information, a feasible transaction path between all power sales nodes and power purchase nodes is established; among them, each province participating in the inter-provincial multi-channel centralized bidding and clearing is equipped with multiple market entities, each of which can act as a power purchase role or a power sales role in a preset time period, and the market entity acting as a power purchase role is set at the power purchase node, and the market entity acting as a power sales role is set at the power sales node; each market entity acting as a power sales role sets the power sales declared quantity and power sales declared electricity price in different time periods based on the power generation or contract transfer needs; each market entity acting as a power purchase role sets the power purchase declared quantity and power purchase declared electricity price in different time periods based on the power consumption or contract transfer needs;

[0008] Based on the established feasible transaction path, the electricity purchase declared prices of market entities acting as power purchasers are converted, and taking social welfare maximization as the objective function, the winning electricity constraints of market entities acting as power sellers, the winning electricity constraints of market entities acting as power purchasers, the path electricity conversion constraints and the interconnection line flow constraints are considered to carry out inter-provincial multi-channel centralized bidding optimization clearing supporting contract transfer, and the clearing electricity of each market entity acting as power purchaser and each market entity acting as power seller in different periods of time is obtained.

[0009] A further improvement of the present invention is that

[0010] The step of establishing a feasible transaction path between all power selling nodes and power purchasing nodes includes:

[0011] Based on the starting and ending province information of all inter-provincial UHV channels and AC sections, all feasible trading paths between each power purchase and sales node pair are searched; the same trading path does not pass through the same provincial node or the same interconnection line repeatedly; the starting and ending provinces of all interconnection lines passed by each trading path, the search order and direction, the forward or reverse transmission price and the network loss rate constitute a complete parameter set of the trading path;

[0012] All feasible transaction paths between all power purchasing and selling node pairs constitute a complete path set for optimized clearing, completing the construction of feasible transaction paths between all power selling nodes and power purchasing nodes.

[0013] A further improvement of the present invention is that

[0014] The feasible transaction paths established between all electricity sales nodes and electricity purchase nodes include:

[0015] The transaction paths between the original purchasing province and the original purchasing province, the transaction paths between the original selling province and the original selling province, the transaction paths between the original selling province and the original purchasing province, the transaction paths between the original purchasing province and the original selling province, and the virtual transaction paths formed between the power purchasing nodes and power selling nodes in the same province;

[0016] Among them, the original purchasing province and the original selling province are respectively divided into the province of power purchasing node and the province of power selling node in the fixed purchasing and selling role model.

[0017] A further improvement of the present invention is that

[0018] In the step of converting the electricity purchase price declared by the market entity as the electricity purchaser based on the established feasible transaction path,

[0019] The conversion expression is:

[0020]

[0021] In the formula, The electricity purchase quotation is converted for the market entity j as the electricity purchaser in the period t through the transaction path r; is the electricity purchase price reported by market entity j in time period t; l is the network loss on the tie line l; r is the set of contact lines contained in the transaction path r; s l,t represents the transmission price on the tie line l; γ r,l is the set of contact lines from the starting point to the contact line l of the transaction path r; n is the contact line code; is the set of market entities that purchase electricity in period t; j is the set of transaction paths with market entity j, which plays the role of electricity purchase, as the recipient.

[0022] A further improvement of the present invention is that

[0023] The expression of the objective function is:

[0024]

[0025] Where U is the objective function; T is the total number of optimization periods; is the electricity purchase cost in period t; is the electricity sales cost in period t; is the electricity purchase discount of market entity j as the electricity purchaser through transaction path r in time period t; The electricity selling quotation for market entity i in time period t; is the electricity sales transaction volume of market entity i in time period t; i,j,t,ris the transaction volume of the buying and selling pair (i, j) at the sending end through the transaction path r in period t; is the set of market entities that sell electricity in time period t; Ω i,j is the set of feasible transaction paths between market entity i as the electricity seller and market entity j as the electricity buyer.

[0026] A further improvement of the present invention is that

[0027] The power consumption constraint of the market entity that sells electricity is expressed as:

[0028]

[0029] In the formula, is the electricity sales volume of market entity i in period t as the electricity seller;

[0030] The power consumption constraint of the market entity as the power purchaser is expressed as:

[0031]

[0032] In the formula, is the electricity purchase transaction volume of market entity j in period t as the electricity purchaser; is the electricity purchase amount reported by market entity j in period t as the electricity purchaser;

[0033] The path power conversion constraint is expressed as:

[0034]

[0035] In the formula, y i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the receiving end through the transaction path r in period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the beginning through the transaction path r in time period t; Ω i,j is the set of feasible transaction paths between market entity i as the electricity purchaser and market entity j as the electricity seller.

[0036] The tie line power flow constraint is expressed as:

[0037]

[0038] In the formula, td l,t is the power flow value of tie line l at time t; l is the set of transaction paths containing the contact line l; D r,l is the flow direction of the transaction path r through the tie line l; is the negative available transmission capacity limit of tie line l at time t; is the forward available transmission capacity limit of tie line l at time t; is the downhill limit of the tie line l at time t; is the climbing limit of the tie line l at time t; td l,t-1 is the flow value passing through tie line l at time t-1.

[0039] The second aspect of the present invention provides an inter-provincial centralized bidding and clearing system supporting contract transfer, comprising:

[0040] A feasible transaction path establishment module is used to establish feasible transaction paths between all power sales nodes and power purchase nodes according to the power purchase nodes and power sales nodes set by each province participating in the inter-provincial multi-channel centralized bidding and clearing, combined with the inter-provincial ultra-high voltage channel and the provincial AC section information; wherein, each province participating in the inter-provincial multi-channel centralized bidding and clearing is equipped with multiple market entities, each of which can act as a power purchase role or a power sales role in a preset time period, and the market entity acting as a power purchase role is set at the power purchase node, and the market entity acting as a power sales role is set at the power sales node; each market entity acting as a power sales role sets the power sales declared electricity quantity and power sales declared electricity price in different time periods based on power generation or contract transfer needs; each market entity acting as a power purchase role sets the power purchase declared electricity quantity and power purchase declared electricity price in different time periods based on power consumption or contract transfer needs;

[0041] The clearing module is used to convert the electricity purchase prices declared by market entities that play the role of electricity purchasers based on the established feasible transaction paths, and take maximizing social welfare as the objective function. It considers the winning electricity constraints of market entities that play the role of electricity sales, the winning electricity constraints of market entities that play the role of electricity purchasers, the path electricity conversion constraints and the interconnection line flow constraints, and carries out inter-provincial multi-channel centralized bidding optimization clearing that supports contract transfer, and obtains the clearing electricity of each market entity that plays the role of electricity purchasers and each market entity that plays the role of electricity sales in different periods of time.

[0042] A further improvement of the present invention is that

[0043] In the feasible transaction path establishment module, the step of establishing feasible transaction paths between all power selling nodes and power purchasing nodes includes:

[0044] Based on the starting and ending province information of all inter-provincial UHV channels and AC sections, all feasible trading paths between each power purchase and sales node pair are searched; the same trading path does not repeatedly pass through the same provincial node or the same interconnection line; the starting and ending provinces of all interconnection lines passed by each trading path, the search order and direction, the forward or reverse transmission price and the network loss rate constitute a complete parameter set of the trading path;

[0045] All feasible transaction paths between all power purchasing and selling node pairs constitute a complete path set for optimized clearing, completing the construction of feasible transaction paths between all power selling nodes and power purchasing nodes.

[0046] A further improvement of the present invention is that

[0047] In the feasible transaction path establishment module, the feasible transaction paths established between all power selling nodes and power purchasing nodes include:

[0048] The transaction paths between the original purchasing province and the original purchasing province, the transaction paths between the original selling province and the original selling province, the transaction paths between the original selling province and the original purchasing province, the transaction paths between the original purchasing province and the original selling province, and the virtual transaction paths formed between the power purchasing nodes and power selling nodes in the same province;

[0049] Among them, the original purchasing province and the original selling province are respectively divided into the province of power purchasing node and the province of power selling node in the fixed purchasing and selling role model.

[0050] A further improvement of the present invention is that

[0051] In the clearing module, in the step of converting the electricity purchase price declared by the market entity as the electricity purchaser based on the established feasible transaction path,

[0052] The conversion expression is:

[0053]

[0054] In the formula, The electricity purchase quotation is converted for the market entity j as the electricity purchaser in the period t through the transaction path r; is the electricity purchase price reported by market entity j in time period t; l is the network loss on the tie line l; r is the set of contact lines contained in the transaction path r; s l,t represents the transmission price on the tie line l; r,l is the set of contact lines from the starting point to the contact line l of the transaction path r; n is the contact line code; is the set of market entities that purchase electricity in period t; j is the set of transaction paths with market entity j, which plays the role of electricity purchase, as the recipient.

[0055] A further improvement of the present invention is that

[0056] In the clearing module, the expression of the objective function is:

[0057]

[0058] Where U is the objective function; T is the total number of optimization periods; is the electricity purchase cost in period t; is the electricity sales cost in period t; is the electricity purchase discount of market entity j as the electricity purchaser through transaction path r in time period t; The electricity selling quotation for market entity i in time period t; is the electricity sales transaction volume of market entity i in time period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the sending end through the transaction path r in period t; is the set of market entities that sell electricity in time period t; Ω i,j is the set of feasible transaction paths between market entity i as the electricity seller and market entity j as the electricity buyer.

[0059] A further improvement of the present invention is that

[0060] The power consumption constraint of the market entity that sells electricity is expressed as:

[0061]

[0062] In the formula, is the electricity sales volume of market entity i in period t as the electricity seller;

[0063] The power consumption constraint of the market entity as the power purchaser is expressed as:

[0064]

[0065] In the formula, is the electricity purchase transaction volume of market entity j in period t as the electricity purchaser; is the electricity purchase amount reported by market entity j in period t as the electricity purchaser;

[0066] The path power conversion constraint is expressed as:

[0067]

[0068] In the formula, y i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the receiving end through the transaction path r in period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the beginning through the transaction path r in time period t; Ω i,j is the set of feasible transaction paths between market subject i as the power purchaser and market subject j as the power seller;

[0069] The tie line power flow constraint is expressed as:

[0070]

[0071] In the formula, td l,t is the power flow value of tie line l at time t; l is the set of transaction paths containing the contact line l; D r,l is the flow direction of the transaction path r through the tie line l; is the negative available transmission capacity limit of tie line l at time t; is the forward available transmission capacity limit of tie line l at time t; is the downhill limit of the tie line l at time t; is the climbing limit of the tie line l at time t; td l,t-1 is the flow value passing through tie line l at time t-1.

[0072] According to a third aspect of the present invention, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, an inter-provincial centralized bidding and clearing method for supporting contract transfer as described in any one of the first aspect of the present invention is implemented.

[0073] According to a fourth aspect of the present invention, a non-transitory computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the inter-provincial centralized bidding and clearing method supporting contract transfer as described in any one of the first aspects of the present invention.

[0074] Compared with the prior art, the present invention has the following beneficial effects:

[0075] The present invention discloses an inter-provincial centralized bidding and clearing method supporting contract transfer, specifically, an inter-provincial medium- and long-term centralized bidding and clearing scheme supporting flexible contract adjustment, which allows the same province to access as both a power purchase and a power sales role at the same time, allows the reverse path between traditional power sales and power purchase provinces, as well as traditional seller provinces, traditional buyer provinces, and intra-provincial transaction paths to access, and each market subject can uniformly declare and clear in multiple channels when it is necessary to adjust the contract curve, thereby realizing the market subject's flexible adjustment of the power curve, achieving the effect of integrating the traditional inter-provincial outbound transaction with the contract transfer, repurchase, and replacement transaction, and reducing the communication cost of the market subject when the market subject frequently adjusts the contract, and improving the utilization rate of the ultra-high voltage channel. In summary, in the technical scheme of the present invention, each province coexists with the purchase and sale market subject in the same optimization period, and each market subject can flexibly switch the purchase and sale roles in different optimization periods, and realizes the traditional outbound transaction and the contract transfer transaction through a multi-channel centralized bidding optimization and clearing, thereby reducing the communication cost between market members, improving the flexibility and economy of contract adjustment, and improving the efficiency of inter-provincial transaction organization and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0077] Figure 1 It is a flow chart of an inter-provincial centralized bidding and clearing method supporting contract transfer in an embodiment of the present invention.

[0078] Figure 2 It is a schematic diagram of the principle of an inter-provincial centralized bidding and clearing method supporting contract transfer in an embodiment of the present invention.

[0079] Figure 3 It is a schematic diagram of an inter-provincial centralized bidding and clearing system supporting contract transfer in an embodiment of the present invention. DETAILED DESCRIPTION

[0080] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments and technical solutions are only part of the embodiments of the present invention, not all of the embodiments.

[0081] All other embodiments obtained by those of ordinary skill in the art without creative work based on the technical solutions disclosed in the embodiments of the present invention belong to the scope of protection of the present invention. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0082] See also Figure 1 In an embodiment of the present invention, a method for inter-provincial centralized bidding and clearing supporting contract transfer is provided, which specifically includes the following steps:

[0083] Step 1: According to the power purchase nodes and power sales nodes set by each province participating in the inter-provincial multi-channel centralized bidding and clearing, combined with the inter-provincial UHV channels and the AC section information within the province, establish a feasible transaction path between all power sales nodes and power purchase nodes; wherein, each province participating in the inter-provincial multi-channel centralized bidding and clearing is equipped with multiple market entities, each of which can act as a power purchase role or a power sales role in a preset time period, the market entity acting as a power purchase role is set at the power purchase node, and the market entity acting as a power sales role is set at the power sales node; each market entity acting as a power sales role sets the power sales declared quantity and power sales declared price in different time periods based on power generation or contract transfer needs; each market entity acting as a power purchase role sets the power purchase declared quantity and power purchase declared price in different time periods based on power consumption or contract transfer needs;

[0084] Step 2: Based on the feasible transaction path established in step 1, the electricity purchase price declared by the market entities as power purchasers is converted, and the objective function is to maximize social welfare. Considering the winning power constraints of the market entities as power sellers, the winning power constraints of the market entities as power purchasers, the path power conversion constraints and the interconnection line power flow constraints, an inter-provincial multi-channel centralized bidding optimization clearing is carried out to support contract transfer, and the clearing power of each market entity as a power purchaser and each market entity as a power seller in different time periods is obtained.

[0085] The inter-provincial centralized bidding and clearing method taking ATC into account adopted in the existing technical scheme takes the maximum social welfare as the optimization goal, based on the current situation of one price per line between provinces, taking into account the channel transmission fee and ATC, and conducting centralized bidding optimization and clearing of multiple buyers and sellers, realizing cross-provincial multi-channel centralized optimization. However, in the current inter-provincial medium- and long-term centralized bidding and clearing model, the purchase and sale roles of each province are fixed, and the forward and reverse paths are not supported to access at the same time. If there is a need to adjust the contract curve, it needs to be achieved through single-channel contract transfer, repurchase, replacement and other transaction methods. The communication cost between market players is high, and the frequent adjustment needs of market players cannot be met. In view of the defects of the above-mentioned existing technical schemes, the embodiment of the present invention specifically discloses an inter-provincial centralized bidding and clearing scheme that supports contract transfer, realizing that the inter-provincial centralized bidding and clearing can support the market players to flexibly adjust the contract curve.

[0086] Further specifically explained, the embodiment of the present invention proposes an innovative inter-provincial centralized bidding and clearing method that supports contract transfer. The method allows each province to have both buying and selling market entities in the same optimization period, realizing the diversification and coexistence of market roles; in particular, each market entity can flexibly switch between the roles of buyer and seller according to the needs and strategies of different optimization periods, greatly enhancing the flexibility and adaptability of market operation. In the technical solution of the embodiment of the present invention, by implementing a multi-channel centralized bidding optimization and clearing mechanism, it not only effectively covers the traditional outbound transaction mode, but also innovatively integrates the contract transfer transaction function. This integration initiative significantly reduces the communication and coordination costs between market members and reduces the inefficiency caused by information asymmetry or cumbersome transaction processes. In summary, the technical solution of the embodiment of the present invention improves the flexibility and economy of contract adjustment by optimizing the transaction process, so that market entities can respond to market changes more quickly and accurately, seize transaction opportunities, and thus maximize their own interests; in addition, it comprehensively improves the organizational and operational efficiency of inter-provincial transactions, laying a solid foundation for building a more efficient, fair and transparent inter-provincial power market.

[0087] See also Figure 2 In a specific embodiment of the present invention, a method for clearing inter-provincial centralized bidding that supports contract transfer is provided, which specifically includes four steps: setting up the power purchase and sales market entities, establishing the transaction path, converting the power purchase price, and optimizing the centralized bidding. The specific steps are implemented as follows:

[0088] Step (1), setting up market entities for power purchase and sales, including: setting up a power purchase node and a power sales node for each province participating in the inter-provincial multi-channel centralized bidding and clearing; setting up multiple market entities with power sales roles and multiple market entities with power purchase roles on the power purchase node and power sales node of each province; for each market entity with power purchase role / market entity with power sales role, based on the power consumption / generation or contract transfer demand of the market entity, setting the declared power purchase or power sales volume and declared power price parameters for each time period;

[0089] Step (2), transaction path establishment, including: according to the power purchasing nodes and power selling nodes of all provinces set, combined with the inter-provincial UHV channels and the AC section information within the province, establish feasible transaction paths between all power selling nodes and power purchasing nodes; in a further exemplary optional technical solution, the feasible transaction paths include: the transaction path between the original seller's province to the original buyer's province, the transaction path between the original buyer's province to the original buyer's province, the transaction path between the original seller's province and the original seller's province, the transaction path between the original buyer's province and the original seller's province, and the virtual transaction path formed between the purchase and sale nodes in the same province;

[0090] Step (3), converting the electricity purchase price, includes: for all established transaction paths, converting the electricity prices declared by the market entities that play the role of purchasing electricity;

[0091] Step (4), centralized bidding optimization and clearing, includes: based on steps (1) to (3), taking social welfare maximization as the objective function, considering the winning power constraints of market entities as power sellers, the winning power constraints of market entities as power buyers, the path power conversion constraints and the interconnection line flow constraints, carrying out inter-provincial multi-channel centralized bidding optimization and clearing supporting contract transfer, and obtaining the clearing power of each purchasing and selling market entity in different optimization periods.

[0092] In one embodiment of the present invention, the specific steps of establishing feasible transaction paths between all power selling nodes and power purchasing nodes include: based on the starting and ending province information of all inter-provincial ultra-high voltage channels and AC sections, a depth-first search algorithm is used to search for all feasible transaction paths between each power purchasing and selling node pair, and the same transaction path will not repeatedly pass through the same province node or the same interconnection line; the starting and ending provinces, search order and direction, forward or reverse transmission prices, network loss rates and other information of all interconnection lines passed by each transaction path constitute a complete parameter set for the transaction path; all feasible transaction paths between all power purchasing and selling node pairs constitute a complete path set for optimized clearing.

[0093] Explanatory, compared with the prior art in which the purchasing and selling roles in the same province are fixed, that is, the inter-provincial centralized bidding and clearing only includes market entities that play the role of purchasing electricity or market entities that play the role of selling electricity in the same province, the transaction path established in the technical solution of the embodiment of the present invention specifically includes the following situations:

[0094] 1) The transaction paths between the original purchasing province and the original purchasing province, and the transaction paths between the original selling province and the original selling province. The "original purchasing province" and "original selling province" here refer to the purchasing and selling roles of a province in the fixed purchasing and selling role model, where a province is divided into one of the purchasing node and the selling node. Explanatory, the transaction path connects the purchasing node and the selling node. In the model with fixed purchasing and selling roles, the original purchasing province is only divided into one purchasing node, so no transaction path is formed between the original purchasing provinces, and the same is true between the original selling provinces. In the model with coexisting purchasing and selling roles, that is, in the inter-provincial multi-channel centralized bidding clearing model that supports contract transfer, each province is divided into a purchasing node and a selling node, and transaction paths can be searched between the original purchasing provinces and the original selling provinces.

[0095] 2) The transaction path between the original purchasing province and the original selling province. Explanatoryally, in the model with fixed purchasing and selling roles, possible transaction paths between the original purchasing province and the original selling province are searched. In the model with both purchasing and selling roles, the original purchasing province participates in the search for transaction paths as a newly added power selling node, and the original selling province participates in the search for transaction paths as a newly added power purchasing node. It is possible to search for transaction paths composed of different interconnection lines between the original purchasing province and the original selling province, or it is possible to search for a "reverse" transaction path with the same interconnection line structure as the original one; further explanatory, the meaning of "reverse" here is that the interconnection line structure of the two transaction paths is the same, but the positions of the connected purchasing and selling nodes are opposite; in this case, the transmission prices on the interconnection lines are different.

[0096] 3) Virtual transaction paths formed between purchasing and selling nodes in the same province. Explanatoryally, since each province is divided into purchasing nodes and selling nodes, a virtual transaction path is also generated between purchasing and selling nodes within the province; further explanatory, the "virtual" here means that the transaction path within the province does not pass through the inter-provincial DC channel and AC section, but is only a feasible path for intra-provincial transactions.

[0097] In one embodiment of the present invention, for all established feasible transaction paths, the electricity purchase price declared by the market entity as the electricity purchaser is converted, and the specific conversion is announced as follows:

[0098]

[0099] In the formula, The electricity purchase quotation is converted for the market entity j as the electricity purchaser in the period t through the transaction path r; is the electricity purchase price reported by market entity j in time period t; l is the network loss on the tie line l; r is the set of contact lines contained in the transaction path r; γ r,l is the set of contact lines from the starting point to the contact line l for the transaction path r; n is the contact line code; is the set of market entities that purchase electricity in period t; j is the set of transaction paths with market entity j, which plays the role of electricity purchase, as the recipient.

[0100] In one embodiment of the present invention, taking social welfare maximization as the objective function, considering the power consumption constraints of market entities as power sellers, the power consumption constraints of market entities as power buyers, the power conversion constraints of paths, and the power flow constraints of interconnection lines, an inter-provincial multi-channel centralized bidding optimization clearing supporting contract transfer is carried out, and in the step of obtaining the clearing power consumption of each purchasing and selling market entity in different optimization periods,

[0101] The objective function is expressed as:

[0102]

[0103] Where U is the objective function; T is the total number of optimization periods; is the electricity purchase cost in period t; is the electricity sales cost in period t; is the electricity purchase discount of market entity j as the electricity purchaser through transaction path r in time period t; The electricity selling quotation for market entity i in time period t; is the electricity sales transaction volume of market entity i in time period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the sending end through the transaction path r in period t; is the set of market entities that act as electricity sellers in time period t; Ω i,j is the set of feasible transaction paths between market entity i as the electricity seller and market entity j as the electricity buyer.

[0104] The power consumption constraints of the market players who are the power sellers are:

[0105] Explanatory, The calculation method is to calculate the sending-end electricity x of the purchase and sale pair (j, i) with the market entity i as the electricity seller through the corresponding transaction path. i,j,t,r of and;

[0106] Explanatory, Non-negative and not exceeding

[0107] In the formula, is the electricity sales volume of market entity i in period t as the electricity seller;

[0108] The power consumption constraints of the market entities that purchase electricity are as follows:

[0109] Explanatory, The calculation method is to calculate the receiving end power y of the purchase and sale pair (j, i) with market entity j as the power purchase role through the corresponding transaction path. i,j,t,r of and;

[0110] Explanatory, Non-negative and not exceeding

[0111] In the formula, is the electricity purchase transaction volume of market entity j in period t as the electricity purchaser; is the electricity purchase amount reported by market entity j in period t as the electricity purchaser;

[0112] The path power conversion constraint is:

[0113]

[0114] In the formula, y i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the receiving end through the transaction path r in period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the beginning through the transaction path r in time period t; Ω i,j is the set of feasible transaction paths between market subject i as the power purchaser and market subject j as the power seller;

[0115] The tie line power flow constraint is expressed as:

[0116]

[0117]

[0118] In the formula, td l,t is the power flow value of tie line l at time t; l is the set of transaction paths containing the contact line l; D r,l is the flow direction of the transaction path r through the tie line l; is the negative available transmission capacity limit of tie line l at time t; is the forward available transmission capacity limit of tie line l at time t; is the downhill limit of the tie line l at time t; is the climbing limit of the tie line l at time t; td l,t-1 is the flow value passing through tie line l at time t-1.

[0119] To sum up, in the technical solution provided by the embodiment of the present invention, in view of the current actual operation of the inter-provincial medium- and long-term centralized bidding clearing model, the purchase and sale roles of each province are fixed, and the simultaneous access of forward and reverse paths is not supported. A new inter-provincial medium- and long-term centralized bidding clearing method that supports contract transfer is proposed. Purchase and sale nodes and market entities are set up in each province at the same time, and feasible transaction paths between all purchase and sale node pairs are established. Each market entity uniformly declares and clears according to its own power generation, electricity consumption or contract transfer needs. Through inter-provincial multi-channel centralized optimization and solution, while organizing and completing cross-provincial centralized outbound transactions, flexible adjustment of the contract curves of various market entities is achieved.

[0120] In a specific embodiment of the present invention, the same market entity can switch the purchasing and selling entity roles in different time periods, and participate in inter-provincial transactions as a market entity in the role of electricity purchase or as a market entity in the role of electricity sales to realize contract transfer; for example, the set of market entities is {1,2,3,4,5,6}, that is, there are a total of 6 market entities, and the market entities switch the purchasing and selling roles during the preset time periods, as shown in Table 1.

[0121] Table 1. Results of market players switching buying and selling roles

[0122]

[0123] In Table 1, electricity sales are represented by 1 and electricity purchases are represented by 0;

[0124] The sets of electricity sales market entities in the three time periods are {1,2,3,4}, {2,3,5,6}, {1,2,5} respectively; the sets of electricity purchase market entities in the three time periods are {5,6}, {1,4}, {3,4,6} respectively;

[0125] Taking the second period as an example, the market entities that play the role of selling electricity are market entities 2, 3, 5, and 6, and the possible values ​​of i are i = 2, 3, 5, and 6. In order to distinguish the roles of purchasing and selling electricity in period t, the market entities that play the role of purchasing electricity and the market entities that play the role of selling electricity are used, but the values ​​of their subscript numbers correspond to the values ​​of the total numbers of the market entities. For example, as shown in Table 2.

[0126] Table 2. Information reported by market entity m in different periods

[0127]

[0128] In Table 2, i=j=m, and different subscripts are used to facilitate the distinction of the power purchasing / selling roles of market entities in time period t.

[0129] The following are device embodiments of the present invention, which can be used to implement the method embodiments of the present invention. For details not disclosed in the device embodiments, please refer to the method embodiments of the present invention.

[0130] See also Figure 3 In an embodiment of the present invention, a provincial centralized bidding and clearing system supporting contract transfer is provided, comprising the following steps:

[0131] A feasible transaction path establishment module is used to establish feasible transaction paths between all power sales nodes and power purchase nodes according to the power purchase nodes and power sales nodes set by each province participating in the inter-provincial multi-channel centralized bidding and clearing, combined with the inter-provincial ultra-high voltage channel and the provincial AC section information; wherein, each province participating in the inter-provincial multi-channel centralized bidding and clearing is equipped with multiple market entities, each of which can act as a power purchase role or a power sales role in a preset time period, and the market entity acting as a power purchase role is set at the power purchase node, and the market entity acting as a power sales role is set at the power sales node; each market entity acting as a power sales role sets the power sales declared electricity quantity and power sales declared electricity price in different time periods based on power generation or contract transfer needs; each market entity acting as a power purchase role sets the power purchase declared electricity quantity and power purchase declared electricity price in different time periods based on power consumption or contract transfer needs;

[0132] The clearing module is used to convert the electricity purchase prices declared by market entities that play the role of electricity purchasers based on the established feasible transaction paths, and take maximizing social welfare as the objective function. It considers the winning electricity constraints of market entities that play the role of electricity sales, the winning electricity constraints of market entities that play the role of electricity purchasers, the path electricity conversion constraints and the interconnection line flow constraints, and carries out inter-provincial multi-channel centralized bidding optimization clearing that supports contract transfer, and obtains the clearing electricity of each market entity that plays the role of electricity purchasers and each market entity that plays the role of electricity sales in different periods of time.

[0133] In one embodiment of the present invention, a computer device is provided, the computer device comprising a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used to perform the operation of the inter-provincial centralized bidding and clearing method supporting contract transfer.

[0134] In one embodiment of the present invention, a storage medium is provided, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM (Random Access Memory) memory, or a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the inter-provincial centralized bidding and clearing method for supporting contract transfer in the above embodiment.

[0135] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) that contain computer-usable program code.

[0136] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0137] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0138] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An inter-provincial centralized bidding clearing method supporting contract transfer, characterized in that: The following steps are involved: According to the power purchase nodes and power sales nodes set up by each province participating in the inter-provincial multi-channel centralized bidding and clearing, combined with the inter-provincial UHV channels and the provincial AC section information, a feasible transaction path between all power sales nodes and power purchase nodes is established; among them, each province participating in the inter-provincial multi-channel centralized bidding and clearing is equipped with multiple market entities, each of which can act as a power purchase role or a power sales role in a preset time period, and the market entity acting as a power purchase role is set at the power purchase node, and the market entity acting as a power sales role is set at the power sales node; each market entity acting as a power sales role sets the power sales declared quantity and power sales declared electricity price in different time periods based on the power generation or contract transfer needs; each market entity acting as a power purchase role sets the power purchase declared quantity and power purchase declared electricity price in different time periods based on the power consumption or contract transfer needs; Based on the established feasible transaction path, the electricity purchase declared prices of market entities acting as power purchasers are converted, and taking social welfare maximization as the objective function, the winning electricity constraints of market entities acting as power sellers, the winning electricity constraints of market entities acting as power purchasers, the path electricity conversion constraints and the interconnection line flow constraints are considered to carry out inter-provincial multi-channel centralized bidding optimization clearing supporting contract transfer, and the clearing electricity of each market entity acting as power purchaser and each market entity acting as power seller in different periods of time is obtained.

2. According to claim 1, a method for clearing contracts through inter-provincial centralized bidding is characterized in that: The step of establishing a feasible transaction path between all power selling nodes and power purchasing nodes includes: Based on the starting and ending province information of all inter-provincial UHV channels and AC sections, all feasible trading paths between each power purchase and sales node pair are searched; the same trading path does not pass through the same provincial node or the same interconnection line repeatedly; the starting and ending provinces of all interconnection lines passed by each trading path, the search order and direction, the forward or reverse transmission price and the network loss rate constitute a complete parameter set of the trading path; All feasible transaction paths between all power purchasing and selling node pairs constitute a complete path set for optimized clearing, completing the construction of feasible transaction paths between all power selling nodes and power purchasing nodes.

3. The method for clearing out inter-provincial centralized bidding supporting contract transfer according to claim 1 is characterized in that: The feasible transaction paths established between all electricity sales nodes and electricity purchase nodes include: The transaction paths between the original purchasing province and the original purchasing province, the transaction paths between the original selling province and the original selling province, the transaction paths between the original selling province and the original purchasing province, the transaction paths between the original purchasing province and the original selling province, and the virtual transaction paths formed between the power purchasing nodes and power selling nodes in the same province; Among them, the original purchasing province and the original selling province are respectively divided into the province of power purchasing node and the province of power selling node in the fixed purchasing and selling role model.

4. The method for clearing out inter-provincial centralized bidding supporting contract transfer according to claim 1 is characterized in that: In the step of converting the electricity purchase price declared by the market entity as the electricity purchaser based on the established feasible transaction path, The conversion expression is: In the formula, The electricity purchase quotation is converted for the market entity j as the electricity purchaser in the period t through the transaction path r; is the electricity purchase price reported by market entity j in time period t; l is the network loss on the tie line l; r is the set of contact lines contained in the transaction path r; s l,t represents the transmission price on the tie line l; γ r,l is the set of contact lines from the starting point to the contact line l of the transaction path r; n is the contact line code; is the set of market entities that purchase electricity in period t; j is the set of transaction paths with market entity j, which plays the role of electricity purchase, as the recipient.

5. According to claim 1, a method for clearing contracts through inter-provincial centralized bidding is characterized in that: The expression of the objective function is: Where U is the objective function; T is the total number of optimization periods; is the electricity purchase cost in period t; is the electricity sales cost in period t; is the electricity purchase discount of market entity j as the electricity purchaser through transaction path r in time period t; The electricity selling quotation for market entity i in time period t; is the electricity sales transaction volume of market entity i in time period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the sending end through the transaction path r in period t; is the set of market entities that sell electricity in time period t; Ω i,j is the set of feasible transaction paths between market entity i as the electricity seller and market entity j as the electricity buyer.

6. The method for clearing out inter-provincial centralized bidding supporting contract transfer according to claim 1 is characterized in that: The power consumption constraint of the market entity that sells electricity is expressed as: In the formula, is the electricity sales volume of market entity i in period t as the electricity seller; The power consumption constraint of the market entity as the power purchaser is expressed as: In the formula, is the electricity purchase transaction volume of market entity j in period t as the electricity purchaser; is the electricity purchase amount reported by market entity j in period t as the electricity purchaser; The path power conversion constraint is expressed as: In the formula, y i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the receiving end through the transaction path r in period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the beginning through the transaction path r in time period t; Ω i,j is the set of feasible transaction paths between market subject i as the power purchaser and market subject j as the power seller; The tie line power flow constraint is expressed as: In the formula, td l,t is the power flow value of tie line l at time t; l is the set of transaction paths containing the contact line l; D r,l is the flow direction of the transaction path r through the tie line l; is the negative available transmission capacity limit of tie line l at time t; is the forward available transmission capacity limit of tie line l at time t; is the downhill limit of the tie line l at time t; is the climbing limit of the tie line l at time t; td l,t-1 is the flow value passing through tie line l at time t-1.

7. An inter-provincial centralized bidding and clearing system supporting contract transfer, characterized in that: include: A feasible transaction path establishment module is used to establish feasible transaction paths between all power sales nodes and power purchase nodes according to the power purchase nodes and power sales nodes set by each province participating in the inter-provincial multi-channel centralized bidding and clearing, combined with the inter-provincial ultra-high voltage channel and the provincial AC section information; wherein, each province participating in the inter-provincial multi-channel centralized bidding and clearing is equipped with multiple market entities, each of which can act as a power purchase role or a power sales role in a preset time period, and the market entity acting as a power purchase role is set at the power purchase node, and the market entity acting as a power sales role is set at the power sales node; each market entity acting as a power sales role sets the power sales declared electricity quantity and power sales declared electricity price in different time periods based on power generation or contract transfer needs; each market entity acting as a power purchase role sets the power purchase declared electricity quantity and power purchase declared electricity price in different time periods based on power consumption or contract transfer needs; The clearing module is used to convert the electricity purchase prices declared by market entities that play the role of electricity purchasers based on the established feasible transaction paths, and take maximizing social welfare as the objective function. It considers the winning electricity constraints of market entities that play the role of electricity sales, the winning electricity constraints of market entities that play the role of electricity purchasers, the path electricity conversion constraints and the interconnection line flow constraints, and carries out inter-provincial multi-channel centralized bidding optimization clearing that supports contract transfer, and obtains the clearing electricity of each market entity that plays the role of electricity purchasers and each market entity that plays the role of electricity sales in different periods of time.

8. The inter-provincial centralized bidding and clearing system supporting contract transfer according to claim 7 is characterized in that: In the feasible transaction path establishment module, the step of establishing feasible transaction paths between all power selling nodes and power purchasing nodes includes: Based on the starting and ending province information of all inter-provincial UHV channels and AC sections, all feasible trading paths between each power purchase and sales node pair are searched; the same trading path does not pass through the same provincial node or the same interconnection line repeatedly; the starting and ending provinces of all interconnection lines passed by each trading path, the search order and direction, the forward or reverse transmission price and the network loss rate constitute a complete parameter set of the trading path; All feasible transaction paths between all power purchasing and selling node pairs constitute a complete path set for optimized clearing, completing the construction of feasible transaction paths between all power selling nodes and power purchasing nodes.

9. The inter-provincial centralized bidding and clearing system supporting contract transfer according to claim 7 is characterized in that: In the feasible transaction path establishment module, the feasible transaction paths established between all power selling nodes and power purchasing nodes include: The transaction paths between the original purchasing province and the original purchasing province, the transaction paths between the original selling province and the original selling province, the transaction paths between the original selling province and the original purchasing province, the transaction paths between the original purchasing province and the original selling province, and the virtual transaction paths formed between the power purchasing nodes and power selling nodes in the same province; Among them, the original purchasing province and the original selling province are respectively divided into the province of power purchasing node and the province of power selling node in the fixed purchasing and selling role model.

10. The inter-provincial centralized bidding and clearing system supporting contract transfer according to claim 7, characterized in that: In the clearing module, in the step of converting the electricity purchase price declared by the market entity as the electricity purchaser based on the established feasible transaction path, The conversion expression is: In the formula, The electricity purchase quotation is converted for the market entity j as the electricity purchaser in the period t through the transaction path r; is the electricity purchase price reported by market entity j in time period t; l is the network loss on the tie line l; r is the set of contact lines contained in the transaction path r; s l,t represents the transmission price on the tie line l; γ r,l is the set of contact lines from the starting point to the contact line l of the transaction path r; n is the contact line code; is the set of market entities that purchase electricity in period t; j is the set of transaction paths with market entity j, which plays the role of electricity purchase, as the recipient.

11. The inter-provincial centralized bidding and clearing system supporting contract transfer according to claim 7, characterized in that: In the clearing module, the expression of the objective function is: Where U is the objective function; T is the total number of optimization periods; is the electricity purchase cost in period t; is the electricity sales cost in period t; is the electricity purchase discount of market entity j as the electricity purchaser through transaction path r in time period t; The electricity selling quotation for market entity i in time period t; is the electricity sales transaction volume of market entity i in time period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the sending end through the transaction path r in period t; is the set of market entities that sell electricity in time period t; Ω i,j is the set of feasible transaction paths between market entity i as the electricity seller and market entity j as the electricity buyer.

12. The inter-provincial centralized bidding and clearing system supporting contract transfer according to claim 7, characterized in that: The power consumption constraint of the market entity that sells electricity is expressed as: In the formula, is the electricity sales volume of market entity i in period t as the electricity seller; The power consumption constraint of the market entity as the power purchaser is expressed as: In the formula, is the electricity purchase transaction volume of market entity j in period t as the electricity purchaser; is the electricity purchase amount reported by market entity j in period t as the electricity purchaser; The path power conversion constraint is expressed as: In the formula, y i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the receiving end through the transaction path r in period t; i,j,t,r is the transaction volume of the buying and selling pair (i, j) at the beginning through the transaction path r in time period t; Ω i,j is the set of feasible transaction paths between market subject i as the power purchaser and market subject j as the power seller; The tie line power flow constraint is expressed as: In the formula, td l,t is the power flow value of tie line l at time t; l is the set of transaction paths containing the contact line l; D r,l is the flow direction of the transaction path r through the tie line l; is the negative available transmission capacity limit of tie line l at time t; is the forward available transmission capacity limit of tie line l at time t; is the downhill limit of the tie line l at time t; is the climbing limit of the tie line l at time t; td l,t-1 is the flow value passing through tie line l at time t-1.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, it implements the inter-provincial centralized bidding and clearing method for supporting contract transfer as described in any one of claims 1 to 6.

14. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the inter-provincial centralized bidding and clearing method for supporting contract transfer as described in any one of claims 1 to 6.

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