CN113706245A - Cross-provincial electric power transaction path determination method, system, equipment and storage medium - Google Patents
Cross-provincial electric power transaction path determination method, system, equipment and storage medium Download PDFInfo
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Abstract
The invention belongs to the field of power system automation, and discloses a method, a system, equipment and a storage medium for determining a cross-provincial power transaction path, wherein the cross-provincial power transaction path comprises an electricity purchasing node, an electricity selling node, an electricity purchasing declaration amount and an electricity purchasing declaration price which are used for performing cross-provincial power transaction; acquiring all trading paths between the electricity purchasing nodes and the electricity selling nodes and the transmission loss, transmission price and available transmission capacity of each trading path through a preset trans-provincial spot-goods trading path network according to the electricity purchasing nodes and the electricity selling nodes; obtaining the electricity selling price of each transaction path according to the transmission network loss and the transmission price of each transaction path; and acquiring a transaction path combination with the lowest total transaction cost according to the transmission network loss, the electricity selling price and the available transmission capacity of each transaction path, and taking the transaction path combination as a trans-provincial electricity transaction path of the electricity purchasing node and the electricity selling node. The method has the advantages that the transaction path between the electricity purchasing node and the electricity selling node is rapidly acquired, the economic optimization of the whole trans-provincial electric power transaction is realized, and the cost of the trans-provincial electric power transaction is effectively reduced.
Description
Technical Field
The invention belongs to the field of power system automation, and relates to a method, a system, equipment and a storage medium for determining a trans-provincial power transaction path.
Background
Under the environment of rapid construction of provincial level spot electric energy/auxiliary service markets and regional auxiliary service markets, how to realize the coordinated development and cooperation among provincial, regional and provincial level multi-level spot markets is a key problem which is bound to be faced by establishing a spot market for cooperative operation. The collaborative operation of the electric power spot market is one of the core contents for promoting the construction of the electric power market to be deepened, and a cross-provincial electric power spot market transaction path needs to be constructed in advance, so that a direction guide is provided for the construction of the spot market in provinces and provinces.
At present, due to the fact that the scale of a power grid across provinces is large, the number of transaction path combinations is large, when a transaction path is determined, the transaction path is generally formed by direct arrangement based on an alternating current-direct current large power grid, the calculation of the transaction path is difficult, the calculation amount of power transmission cost and power transmission loss is large, and the optimal transaction path is difficult to determine.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned shortcomings of the prior art, and provides a method, a system, a device and a storage medium for determining a cross-provincial electric power transaction path.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
in a first aspect of the present invention, a method for determining a cross-provincial electric power transaction path includes the following steps:
acquiring a power purchasing node, a power selling node, a power purchasing declaration amount and a power purchasing declaration price for performing cross-provincial power transaction;
acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path between the electricity purchasing nodes and the electricity selling nodes through a preset cross-provincial spot-goods transaction path network according to the electricity purchasing nodes and the electricity selling nodes;
obtaining the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission network loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node;
and acquiring a transaction path combination with the lowest total transaction cost according to the electricity purchasing declaration amount, the transmission network loss, the electricity selling price and the available transmission amount of each transaction path between the electricity purchasing node and the electricity selling node, and taking the transaction path combination as a trans-provincial electricity transaction path of the electricity purchasing node and the electricity selling node.
The method for determining the cross-provincial electric power transaction path further improves the steps that:
the cross-provincial spot transaction path network is obtained by the following method: acquiring an alternating current-direct current hybrid power grid of a transaction area; equating all nodes of each provincial power grid in the AC/DC hybrid power grid into a plurality of network nodes, and equating links among the plurality of network nodes into a plurality of transaction paths; traversing all network nodes, combining all transaction paths between any two network nodes into a transaction channel, and connecting a plurality of network nodes through the transaction channel to obtain a cross-provincial spot transaction path network framework; obtaining the transmission limit of each transaction path based on the operation constraint of the AC/DC hybrid power grid; and acquiring the transmission network loss and the transmission price of each transaction path, and combining the transmission network loss, the transmission price and the transmission limit of each transaction path and the provincial-crossing spot-shipment transaction path network framework to obtain a provincial-crossing spot-shipment transaction path network.
The specific method for equating all nodes of each provincial power grid in the AC/DC hybrid power grid into a plurality of network nodes and equating links among the network nodes into a plurality of transaction paths comprises the following steps: the output average value of each node in each provincial power grid is used as upper and lower limit constraints, the upper and lower limit constraints of the output of the internal node are respectively superposed on each bidding subarea according to the preset bidding subarea of each provincial power grid to obtain the upper and lower limit constraints of the output of each bidding subarea, and a plurality of network nodes are obtained by combining the area and the upper and lower limit constraints of each bidding subarea; obtaining the junctor among the network nodes, equating the resistance, the inductance, the capacitance and the current converter of each junctor to the transmission network loss of each junctor, traversing all the network nodes, and connecting the junctors between any two network nodes according to the transmission path to obtain a plurality of transaction paths.
The operation constraints of the AC/DC hybrid power grid comprise system operation constraints, unit operation constraints and power grid safety constraints, or further comprise one or more of unit fixed output constraints, unit fixed start-stop mode constraints, unit group output constraints, partition voltage support constraints, partition standby constraints, fuel constraints, partition electric quantity constraints, contract constraints and environment-friendly emission constraints; the cross-provincial spot transaction path network framework is stored in the form of a graph.
The specific method for acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path through the preset cross-provincial spot-shipment transaction path network comprises the following steps: determining network nodes to which electricity purchasing nodes and electricity selling nodes belong in a cross-provincial spot goods transaction path network, acquiring transaction channels between the electricity purchasing nodes and the network nodes to which the electricity selling nodes belong through a preset cross-provincial spot goods transaction path network, acquiring all transaction paths in the transaction channels, acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes, and acquiring power transmission network loss, power transmission price and transmission limit of each transaction path between the electricity purchasing nodes and the electricity selling nodes; and obtaining the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node according to the transmission limit of each transaction path between the electricity purchasing node and the electricity selling node and based on the occupied transmission quantity, the reliability margin and the benefit margin preset by each transaction path between the electricity purchasing node and the electricity selling node.
The specific method for obtaining the electricity selling price of each transaction path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission network loss and the transmission price of each transaction path between the electricity purchasing node and the electricity selling node comprises the following steps: and converting the electricity purchasing request price into the electricity selling node according to the transmission network loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node to obtain the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node.
The specific method for obtaining the transaction path combination with the lowest total transaction cost according to the electricity purchasing declaration amount, the transmission network loss, the electricity selling price and the available transmission amount of each transaction path between the electricity purchasing node and the electricity selling node comprises the following steps: obtaining available electricity purchasing quantity of each transaction path between the electricity purchasing node and the electricity selling node according to the transmission network loss and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node; and according to the sequence of the electricity selling prices of all transaction paths between the electricity purchasing nodes and the electricity selling nodes from small to large, sequentially overlapping the available electricity purchasing quantity of all the transaction paths between the electricity purchasing nodes and the electricity selling nodes to be not less than the electricity purchasing declaration quantity, and taking the transaction path combination with the overlapped available electricity purchasing quantity as the transaction path combination with the lowest total transaction cost.
In a second aspect of the present invention, a system for determining a cross-provincial electric power transaction path includes:
the acquisition module is used for acquiring electricity purchasing nodes, electricity selling nodes, electricity purchasing applying amount and electricity purchasing applying quotation for performing trans-provincial electricity transaction;
the transaction path acquisition module is used for acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path between the electricity purchasing nodes and the electricity selling nodes through a preset cross-provincial spot goods transaction path network according to the electricity purchasing nodes and the electricity selling nodes;
the conversion module is used for obtaining the electricity selling price of each transaction path between the electricity purchasing node and the electricity selling node according to the electricity purchasing declaration price and the transmission network loss and the transmission price of each transaction path between the electricity purchasing node and the electricity selling node;
and the transaction path determining module is used for acquiring a transaction path combination with the lowest total transaction cost according to the electricity purchasing reported quantity, the transmission network loss, the electricity selling price and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node, and using the transaction path combination as a trans-provincial electricity transaction path between the electricity purchasing node and the electricity selling node.
In a third aspect of the present invention, a computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the cross-provincial electric power transaction path determination method when executing the computer program.
In a fourth aspect of the present invention, a computer-readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the cross-provincial electric power transaction path determination method.
Compared with the prior art, the invention has the following beneficial effects:
the method for determining the trans-provincial electric power transaction path comprises the steps of acquiring all transaction paths between the electricity purchasing node and the electricity selling node through a preset trans-provincial spot goods transaction path network based on the electricity purchasing node and the electricity selling node for performing trans-provincial electric power transaction, realizing quick acquisition of the transaction paths between the electricity purchasing node and the electricity selling node, and supporting the trans-provincial electric power transaction involving large-scale electric power spot goods market and mass market members. And acquiring the transmission network loss, transmission price and available transmission capacity of each transaction path between the electricity purchasing node and the electricity selling node through a cross-provincial spot goods transaction path network to realize the fusion of transaction flow and power flow, then acquiring the electricity selling price of each transaction path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission network loss and transmission price of each transaction path between the electricity purchasing node and the electricity selling node, greatly improving the calculation speed of the electricity selling price of each transaction path, and finally acquiring the transaction path combination with the lowest total transaction cost according to the electricity purchasing request quantity and the transmission network loss, the electricity selling price and the available transmission capacity of each transaction path between the electricity purchasing node and the electricity selling node, so that the economic optimization of the whole cross-provincial electricity transaction is realized, and the cost of the cross-provincial electricity transaction is effectively reduced.
Drawings
FIG. 1 is a flowchart of a cross-provincial electric power transaction path determination method according to the present invention;
fig. 2 is a block diagram of a cross-provincial electric power transaction path determination system according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in an embodiment of the present invention, a method for determining a trans-provincial electric power transaction path is provided, in which a physical characteristic that a direct current transmission system is used as a backbone for trans-provincial electric power transaction is considered, node clustering is performed by using an alternating current-direct current hybrid power grid topological structure and combining preset bidding partitions, and equivalence of each provincial power grid partition is realized as a network node. And constructing a cross-provincial spot transaction path network considering the power flow and the transaction flow, and realizing the rapid determination of the cross-provincial electric power transaction path based on the cross-provincial spot transaction path network.
Specifically, the method for determining the trans-provincial electric power transaction path comprises the following steps:
s1: and acquiring a power purchasing node, a power selling node, a power purchasing declaration amount and a power purchasing declaration price for performing cross-provincial power transaction.
Wherein, the electricity purchasing declaration quantity and the electricity purchasing declaration price are declared in advance by the electricity purchasing node according to the electricity purchasing requirement. The electricity selling node can comprise one or a plurality of electricity selling nodes so as to fully meet the electricity purchasing requirement of the electricity purchasing node.
S2: and acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path between the electricity purchasing nodes and the electricity selling nodes according to the electricity purchasing nodes and the electricity selling nodes and through a preset cross-provincial spot-goods transaction path network.
Specifically, when acquiring all transaction paths between the electricity purchasing node and the electricity selling node, the preset cross-provincial region spot transaction path network needs to be relied on.
S201: and acquiring an alternating current-direct current hybrid power grid of the transaction area.
Specifically, the alternating current-direct current hybrid power grid of the trading area can be obtained from a national dispatching system. The national dispatching system stores national-wide alternating current and direct current hybrid power grids, wherein the alternating current and direct current hybrid power grids of the trading area are composed of trans-provincial direct current channels in the trading area and regional power grids, and the regional power grids are generally provincial power grids.
S202: all nodes of each provincial power grid in the alternating current-direct current hybrid power grid are equivalent to a plurality of network nodes, and connecting lines among the network nodes are equivalent to a plurality of transaction paths.
Specifically, the traditional large power grid decomposition coordination algorithm is based on a model decomposition method in an optimization theory, and can be wholly divided into an original problem decomposition technology for decomposing according to a coordination variable and a dual decomposition technology for decomposing according to coupling constraint. In the traditional large power grid decomposition coordination algorithm, repeated information interaction is needed between the upper-layer problem of inter-provincial transaction and the intra-provincial transaction subproblems until the algorithm converges to obtain an optimal value. However, the convergence of the algorithm usually depends on the connection structure of the system and the parameter setting of the algorithm, and the problem of iterative oscillation or even non-convergence may occur in the application. In addition, the iterative information interaction process can accumulate more communication delay, and the overall time consumption of the algorithm is longer. Finally, current power system dispatch operations and power market organizations are sequential, rather than iterative, in time sequence. In conclusion, the traditional large power grid decomposition coordination algorithm cannot meet the actual application requirements of the cross-provincial interval electric power spot transaction. Therefore, in this embodiment, all nodes of each provincial power grid in the alternating current-direct current hybrid power grid are equivalent to a plurality of network nodes, and connecting lines between the plurality of network nodes are equivalent to a plurality of transaction paths, so as to realize the non-iterative inter-provincial transaction path determination.
In this embodiment, a specific method for equating all nodes of each provincial power grid in the ac/dc hybrid power grid to a plurality of network nodes is as follows: the output average value of each node in each provincial power grid is used as upper and lower limit constraints, the upper and lower output limit constraints of the internal node are respectively superposed on each bidding subarea according to the preset bidding subarea of each provincial power grid to obtain the upper and lower output limit constraints of each bidding subarea, and a plurality of network nodes are obtained by combining the area and the upper and lower output limit constraints of each bidding subarea. Specifically, the equal value of the output of each node in each provincial power grid is taken as an upper limit constraint and a lower limit constraint, and the upper limit constraint and the lower limit constraint of the output are defined, namely the lower limit of the output of the node is less than the upper limit of the output of the node. Based on the limitations of location conditions and resource conditions, a plurality of bidding partitions are generally preset in the same provincial power grid, sometimes the whole provincial power grid is used as one bidding partition, and sometimes a plurality of bidding partitions are arranged in one provincial power grid. And based on the preset bidding subareas of each provincial power grid, taking each bidding subarea as an area of one network node, respectively superposing upper and lower output limit constraints of the internal nodes on each bidding subarea to obtain upper and lower output limit constraints of each bidding subarea, and combining the areas of the bidding subareas and the upper and lower output limit constraints to form a final network node.
And based on the load and output balance limit of all nodes of each provincial power grid, the load upper and lower limit constraints and the output upper and lower limit constraints of the network nodes are also balanced.
In this embodiment, a specific method for equating links among a plurality of network nodes to a plurality of transaction paths is as follows: obtaining the junctor among the network nodes, equating the resistance, the inductance, the capacitance and the current converter of each junctor to the transmission network loss of each junctor, traversing all the network nodes, and connecting the junctors between any two network nodes according to the transmission path to obtain a plurality of transaction paths. Specifically, after the network nodes are determined, the links between the network nodes are acquired. The tie lines generally refer to physical lines or sections, such as longzheng dc and four-fish sections, to which specific limits may be set. The existing junctor of the direct current channel of the trans-provincial region and the regional power grid generally comprises a plurality of electrical devices such as an alternating current-direct current converter and a transformer, the electrical devices need to be accurately modeled in a traditional physical model, and physical factors such as available transmission capacity, line maximum limit, sensitivity and the like are considered, so that the resistance, the inductance, the capacitance and the converter of the junctor are uniformly equivalent to the transmission network loss of the junctor, and the junctor is not physically modeled.
After the processing of each tie line is completed, traversing all network nodes, connecting the tie lines between any two network nodes, forming a transaction path between any two network nodes, and obtaining a plurality of transaction paths. Multiple transaction paths may exist between two network nodes, and each transaction path includes multiple links. The transaction path is typically formed by one or more links connected in series, such as "+ debao dc + agnto dc", where the sign preceding each link is the positive direction of its delivered power.
S203: and traversing all network nodes, combining all transaction paths between any two network nodes into a transaction channel, and connecting a plurality of network nodes through the transaction channel to obtain a cross-provincial spot transaction path network framework.
Specifically, in order to facilitate the acquisition of the subsequent electricity purchasing node to the transaction path of the multi-electricity selling node, a concept of a transaction channel is introduced, the transaction channel is a transaction flow direction formed by a transaction sending party and a transaction receiving party, and the transaction channel can comprise a plurality of transaction paths. The transaction channel is used to describe the connection relationship between the sending party and the receiving party, and taking the transaction channel of sending jiangsu in sichuan as an example, the transaction channel includes a plurality of transaction paths, such as "+ jin su dc", "bnjin dc", etc., each transaction path may be composed of a plurality of links. All transaction paths between any two network nodes are combined into a transaction channel by traversing all network nodes.
After the transaction channel between any two network nodes is determined, a plurality of network nodes are connected through the transaction channel, and a cross-provincial region spot transaction path network framework is obtained. Preferably, the cross-provincial spot transaction path network framework is stored in a graph form, and based on the existing graph traversal algorithm, required transaction channels can be quickly searched from the graph-form cross-provincial spot transaction path network framework.
S204: and obtaining the transmission limit of each transaction path based on the operation constraint of the alternating current-direct current hybrid power grid.
Specifically, the operation constraints of the alternating current-direct current hybrid power grid include system operation constraints, unit operation constraints and power grid safety constraints. The constraints are basic conditions which must be met by the unit for generating power and the operation of the power grid, and the constraints do not relate to a specific scheduling mode, namely the constraints which must be considered in any mode.
Wherein the system operation constraints include load balancing constraints, rotational standby constraints, and adjustment standby constraints.
And (3) load balance constraint:
wherein p isd(t) generating aperture net load of the alternating current-direct current hybrid power grid when t is obtained; p is a radical oftieline(t) is the tie line power when the alternating current-direct current hybrid power grid t; and l (T) is the schedulable load of the AC/DC hybrid power grid T, T is the scheduling period, I is the set of the AC/DC hybrid power grid, and I is the set number of the AC/DC hybrid power grid.
Rotating standby constraint:
wherein,
the up-regulation rotation is provided for the unit i at t for standby;
for the up-regulation of the rotational standby demand at system t,r i (t) providing downward adjustment rotation for the unit i at t for standby;p r (t) rotational reserve demand for turndown at system t.
Adjustment (AGC) standby constraint:
wherein,
AGC up-regulation is carried out for the unit i at t for standby;
for the AGC up-regulation standby requirement when the AC/DC hybrid power grid is t,r' i (t) AGC is adjusted for standby of the unit i at t;p r '(t) AGC down standby requirement for AC/DC hybrid grid t, IgThe AGC standby unit set is an AC/DC hybrid power grid.
The unit operation constraints comprise unit output power upper and lower limit constraints, unit minimum operation time constraints, unit minimum shutdown time constraints and unit maximumThe number of times of start and stop, the load rate constraint of the unit and the available state constraint of the unit. The upper and lower limits of the output power of the unit are constrained as follows: the output power of the unit should be greater than or equal to the lower limit of the output power of the unit and less than or equal to the upper limit of the output power of the unit. The minimum unit running time constraint is as follows: the unit running time should be greater than or equal to the minimum running time of the unit in the scheduling period. The minimum shutdown time constraint of the unit is as follows: the unit outage time should be greater than or equal to the minimum outage time of the unit in the scheduling period. The maximum starting and stopping times of the unit is constrained as follows: the starting and stopping times of the unit in the whole scheduling period should be less than or equal to the maximum starting and stopping times of the unit in the scheduling period. The constraint of the load increasing and reducing rate of the unit is as follows: deltai1≤pi(t)-pi(t-1)≤Δi2Wherein, isi1And Δi2And respectively loading and unloading the maximum value of each time interval of the unit i. The available state constraint of the unit is as follows: u. ofi(T) is 0, if T ∈ TrWherein, TrThe method is mainly used for starting the unit when a unit combination result is issued, and is a maintenance time interval or a shutdown time interval before the earliest starting time.
The power grid safety constraint comprises branch power flow constraint and tie line section power flow constraint.
Wherein the branch flow constraint is:
wherein,p ab ，pab，
and respectively representing the tidal current power and the upper and lower limits of the tidal current power of the branches a and b in the alternating current-direct current hybrid power grid. The cross section tidal current constraint of the tie line is as follows:
wherein,p cd ，pcd，
respectively representing ac or dcAnd (4) the tidal current power and the upper and lower limits of the tidal current power of the sections c and d in the hybrid power grid.
Preferably, the operation constraints of the alternating current-direct current hybrid power grid further include one or more of a unit fixed output constraint, a unit fixed start-stop mode constraint, a unit group output constraint, a partition voltage support constraint, a partition standby constraint, a fuel constraint, a partition electric quantity constraint, a contract constraint and an environmental emission constraint.
The system comprises a power grid, a power grid group, a power grid, a voltage division support and a division standby constraint, wherein the power grid is fixedly output, the power grid is fixedly started and stopped, the power grid group is output, the voltage division support and the division standby constraint are practical constraints, and the practical constraints are constraint conditions which can be selected according to the characteristics of power grid operation when the actual power grid is considered to be scheduled and operated. Such conditions are set based on the requirements of the grid and the unit operation. Wherein, the fixed output constraint of unit is: the unit operates according to a given power generation plan in a specific time period, and the unit does not participate in economic dispatching calculation in the specific time period. The fixed start and stop of the unit are restricted as follows: the available state of the unit in a specific time period comprises the necessary start and the necessary stop. The two types of units do not participate in the unit combination calculation in the specific time period. The output constraint of the machine group is as follows:
wherein, Av represents a group of machines,pthe lower limit of the output of the machine group is shown,
the upper limit of the output of the machine group is shown,pand
expressed as a percentage of the ac/dc hybrid grid load forecast. The partition voltage support constraint is:
where Av denotes the reactive voltage division, Pv(t) represents the zone voltage support capacity. The partition standby constraints are:
wherein Ar represents the active standby of a certain partition.
The fuel constraint, the partition electric quantity constraint, the contract constraint and the environmental emission constraint are operational constraints, the operational constraints are constraint conditions needing to be considered under a specific scheduling mode, or under specific natural conditions or social conditions, and the conditions are determined according to actual conditions of different occasions. Wherein the fuel constraint is: the fuel should be greater than or equal to the sum of the fuel consumption of each unit in the scheduling period. The partition electric quantity constraint is as follows:
h1(T) and H2(T) represent the upper and lower electric quantity limits of the scheduling period T, and when the upper and lower electric quantity limits take the same value, the fixed electric quantity constraint of the unit or the unit group can be processed. The contract constraint is as follows:
wherein, C (p)i(T)) represents the contract composition function of the unit i, and C (T) represents the contract electric quantity of the scheduling period T. The environmental emission constraints are:
wherein, E (pi (T)) represents the environmental protection emission function of the unit i and is represented by an average coefficient, and E (T) represents the emission amount of the scheduling period T.
In order to utilize the power generation of the unit as fully as possible, the transmission limit of each tie line is obtained under the limits of the above constraints, with the sum of the transmission powers on all tie lines between the unit and the grid being the maximum. And taking the lowest conveying limit in the conveying limits of each connecting line in the transaction path as the conveying limit of the transaction path, and further obtaining the conveying limit of each transaction path.
S205: and acquiring the transmission network loss and the transmission price of each transaction path, and combining the transmission network loss, the transmission price and the transmission limit of each transaction path and the provincial-crossing spot-shipment transaction path network framework to obtain a provincial-crossing spot-shipment transaction path network. The specific method for acquiring the transmission loss and the transmission price of each transaction path comprises the following steps: acquiring junctor included in each transaction path, acquiring power transmission loss and power transmission price of each junctor, wherein the power transmission price state adjustment system of each junctor is preset; and then, respectively overlapping the transmission network loss and the transmission price of the connecting line contained in each transaction path to obtain the transmission network loss and the transmission price of each transaction path. And finally, combining the transmission power loss, the transmission price and the transmission limit of each transaction path and a cross-provincial region spot transaction path network framework to obtain a cross-provincial region spot transaction path network.
The specific method for acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path through the preset cross-provincial spot-shipment transaction path network comprises the following steps: determining network nodes to which electricity purchasing nodes and electricity selling nodes belong in a cross-provincial spot goods transaction path network, acquiring transaction channels between the electricity purchasing nodes and the network nodes to which the electricity selling nodes belong through a preset cross-provincial spot goods transaction path network, acquiring all transaction paths in the transaction channels, acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes, and acquiring power transmission network loss, power transmission price and transmission limit of each transaction path between the electricity purchasing nodes and the electricity selling nodes; and obtaining the available transmission amount of each transaction path between the electricity purchasing node and the electricity selling node based on the preset occupied transmission amount, the preset reliability margin and the preset benefit margin according to the transmission limit of each transaction path between the electricity purchasing node and the electricity selling node.
Wherein, the available transmission capacity of the transaction path between the electricity purchasing node and the electricity selling node is equal to the transmission limit-occupied transmission capacity-reliability margin-benefit margin. The occupied transmission capacity is the transmission capacity occupied by the existing transmission and distribution plan and the normal power flow under the given condition, can be obtained from the clearing result, and can be further divided into the available transmission capacity which can be cancelled and the available transmission capacity which cannot be cancelled. The reliability margin is necessary transmission capacity reserved for ensuring the safe and stable operation of the whole alternating current-direct current hybrid power grid under the condition of change within a certain range, reflects the influence of uncertain factors on the alternating current-direct current hybrid power grid, and the longer the considered time is, the more reliability margin is required to be reserved. The benefit margin is a transmission capacity margin reserved for obtaining power from other interconnected power grids to meet the power generation reliability, and reflects the transmission capacity which needs to be reserved by the alternating-current/direct-current hybrid power grid to guarantee that irrevocable transmission service is smoothly executed. The reliability margin and the benefit margin are manually set after referring to historical experience according to the characteristics of the alternating current-direct current hybrid power grid.
S3: and obtaining the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission network loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node.
Specifically, the specific method for obtaining the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission network loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node comprises the following steps: and converting the electricity purchasing request price into the electricity selling node according to the transmission network loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node to obtain the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node.
When converting the electricity purchasing applying quotation to the electricity selling node according to the transmission network loss and the transmission price of each transaction path between the electricity purchasing node and the electricity selling node, the following method is adopted for conversion:
price'buy,w,t＝pricebuy,w,t×coe1+coe2
therein, pricebuy,w,tThe electricity purchasing request price of the electricity purchasing node w in the t period is quoted; nice'buy,w,tConverting the electricity purchasing request price of the electricity purchasing node w in the period t into the electricity purchasing request price of the electricity selling node, namely the electricity selling price of the current transaction path between the electricity purchasing node and the electricity selling node; coe1、coe2Is a foldCalculating parameters; rhomThe power transmission loss of the mth segment of connecting line from the power selling node to the power purchasing node in the current transaction path is determined; ptmThe electricity transmission price of the mth segment of connecting line from the electricity selling node to the electricity purchasing node in the current transaction path is calculated; n is the total number of links in the current transaction path.
S4: and acquiring a transaction path combination with the lowest total transaction cost according to the electricity purchasing declaration amount, the transmission network loss, the electricity selling price and the available transmission amount of each transaction path between the electricity purchasing node and the electricity selling node, and taking the transaction path combination as a trans-provincial electricity transaction path of the electricity purchasing node and the electricity selling node.
Specifically, the specific method for obtaining the transaction path combination with the lowest total transaction cost according to the electricity purchase declaration amount, the transmission network loss, the electricity selling price and the available transmission amount of each transaction path between the electricity purchase node and the electricity selling node is as follows: obtaining available electricity purchasing quantity of each transaction path between the electricity purchasing node and the electricity selling node according to the transmission network loss and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node; and according to the sequence of the electricity selling prices of all transaction paths between the electricity purchasing nodes and the electricity selling nodes from small to large, sequentially overlapping the available electricity purchasing quantity of all the transaction paths between the electricity purchasing nodes and the electricity selling nodes to be not less than the electricity purchasing declaration quantity, and taking the transaction path combination with the overlapped available electricity purchasing quantity as the transaction path combination with the lowest total transaction cost.
The specific method for obtaining the available electricity purchasing quantity of each transaction path between the electricity purchasing node and the electricity selling node according to the transmission network loss and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node comprises the following steps:
converting the electricity purchasing return quantity of the electricity purchasing node to the electricity selling node by adopting the following formula according to the transmission network loss and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node:
power′buy,w,t＝powerbuy,w,t÷coe1
wherein, powerbuy,w,tThe electricity purchasing request quantity of the electricity purchasing node w in the time period t is obtained; power 'of'buy,w,tAnd converting the electricity purchasing declaration of the electricity purchasing node w in the time period t into the electricity purchasing declaration of the electricity selling node.
When power'buy,w,tEqual to the available delivery volume of the current transaction path, powerbuy,w,tAnd the available electricity purchasing quantity of the current transaction path between the electricity purchasing node and the electricity selling node is obtained. Then, according to the sequence of the electricity selling prices of all transaction paths between the electricity purchasing nodes and the electricity selling nodes from small to large, the available electricity purchasing quantity of all the transaction paths between the electricity purchasing nodes and the electricity selling nodes is sequentially superposed to be not less than the electricity purchasing declaration quantity, and the transaction path combination superposed with the available electricity purchasing quantity is used as the transaction path combination with the lowest total transaction cost, so that the lowest total transaction cost is realized.
In summary, the method for determining the cross-provincial electric power transaction path according to the present invention obtains all transaction paths between the electricity purchasing node and the electricity selling node through the preset cross-provincial spot transaction path network based on the electricity purchasing node and the electricity selling node performing the cross-provincial electric power transaction, so as to realize fast obtaining of the transaction paths between the electricity purchasing node and the electricity selling node, and support the cross-provincial electric power transaction involving the large-scale electric power spot market and the mass market members. And acquiring the transmission network loss, transmission price and available transmission capacity of each transaction path between the electricity purchasing node and the electricity selling node through a cross-provincial spot goods transaction path network to realize the fusion of transaction flow and power flow, then acquiring the electricity selling price of each transaction path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission network loss and transmission price of each transaction path between the electricity purchasing node and the electricity selling node, greatly improving the calculation speed of the electricity selling price of each transaction path, and finally acquiring the transaction path combination with the lowest total transaction cost according to the electricity purchasing request quantity and the transmission network loss, the electricity selling price and the available transmission capacity of each transaction path between the electricity purchasing node and the electricity selling node, so that the economic optimization of the whole cross-provincial electricity transaction is realized, and the cost of the cross-provincial electricity transaction is effectively reduced.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details of non-careless mistakes in the embodiment of the apparatus, please refer to the embodiment of the method of the present invention.
Referring to fig. 2, in a further embodiment of the present invention, a system for determining a cross-provincial electric power transaction path is provided, which can be used to implement the above method for determining a cross-provincial electric power transaction path.
The acquisition module is used for acquiring electricity purchasing nodes, electricity selling nodes, electricity purchasing declaration amount and electricity purchasing declaration price for performing trans-provincial electricity transaction; the transaction path acquisition module is used for acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path between the electricity purchasing nodes and the electricity selling nodes through a preset cross-provincial spot-goods transaction path network according to the electricity purchasing nodes and the electricity selling nodes; the conversion module is used for obtaining the electricity selling price of each transaction path between the electricity purchasing node and the electricity selling node according to the electricity purchasing declaration price and the transmission network loss and the transmission price of each transaction path between the electricity purchasing node and the electricity selling node; and the transaction path determining module is used for acquiring a transaction path combination with the lowest total transaction cost according to the electricity purchasing reported quantity, the transmission network loss, the electricity selling price and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node, and taking the transaction path combination as a trans-provincial electricity transaction path of the electricity purchasing node and the electricity selling node.
In yet another embodiment of the present invention, a computer device is provided that includes a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The Processor may be a Central Processing Unit (CPU), or may be other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., which is a computing core and a control core of the terminal, and is specifically adapted to load and execute one or more instructions in a computer storage medium to implement a corresponding method flow or a corresponding function; the processor according to the embodiment of the invention can be used for determining the operation of the cross-provincial electric power transaction path.
In yet another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a Memory device in a computer device and is used for storing programs and data. It is understood that the computer readable storage medium herein 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 storing an operating system of the terminal. Also, one or more instructions, which may be one or more computer programs (including program code), are stored in the memory space and are adapted to be loaded and executed by the processor. It should be noted that the computer-readable storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the corresponding steps of the cross-provincial electric power transaction path determination method in the above embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A cross-provincial electric power transaction path determining method is characterized by comprising the following steps:
acquiring a power purchasing node, a power selling node, a power purchasing declaration amount and a power purchasing declaration price for performing cross-provincial power transaction;
acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path between the electricity purchasing nodes and the electricity selling nodes through a preset cross-provincial spot-goods transaction path network according to the electricity purchasing nodes and the electricity selling nodes;
obtaining the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission network loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node;
and acquiring a transaction path combination with the lowest total transaction cost according to the electricity purchasing declaration amount, the transmission network loss, the electricity selling price and the available transmission amount of each transaction path between the electricity purchasing node and the electricity selling node, and taking the transaction path combination as a trans-provincial electricity transaction path of the electricity purchasing node and the electricity selling node.
2. The method according to claim 1, wherein the cross-provincial spot transaction path network is obtained by:
acquiring an alternating current-direct current hybrid power grid of a transaction area;
equating all nodes of each provincial power grid in the AC/DC hybrid power grid into a plurality of network nodes, and equating links among the plurality of network nodes into a plurality of transaction paths;
traversing all network nodes, combining all transaction paths between any two network nodes into a transaction channel, and connecting a plurality of network nodes through the transaction channel to obtain a cross-provincial spot transaction path network framework;
obtaining the transmission limit of each transaction path based on the operation constraint of the AC/DC hybrid power grid;
and acquiring the transmission network loss and the transmission price of each transaction path, and combining the transmission network loss, the transmission price and the transmission limit of each transaction path and the provincial-crossing spot-shipment transaction path network framework to obtain a provincial-crossing spot-shipment transaction path network.
3. The method for determining the trans-provincial electric power transaction path according to claim 2, wherein the specific method for equating all nodes of each provincial electric network in the AC/DC hybrid electric network into a plurality of network nodes and equating links among the plurality of network nodes into a plurality of transaction paths is as follows:
the output average value of each node in each provincial power grid is used as upper and lower limit constraints, the upper and lower limit constraints of the output of the internal node are respectively superposed on each bidding subarea according to the preset bidding subarea of each provincial power grid to obtain the upper and lower limit constraints of the output of each bidding subarea, and a plurality of network nodes are obtained by combining the area and the upper and lower limit constraints of each bidding subarea;
obtaining the junctor among the network nodes, equating the resistance, the inductance, the capacitance and the current converter of each junctor to the transmission network loss of each junctor, traversing all the network nodes, and connecting the junctors between any two network nodes according to the transmission path to obtain a plurality of transaction paths.
4. The trans-provincial electric power transaction path determining method according to claim 2, wherein the operation constraints of the AC/DC hybrid power grid include system operation constraints, unit operation constraints and grid safety constraints, or further include one or more of unit fixed output constraints, unit fixed start-stop mode constraints, unit group output constraints, partition voltage support constraints, partition standby constraints, fuel constraints, partition electricity quantity constraints, contract constraints and environmental emission constraints; the cross-provincial spot transaction path network framework is stored in the form of a graph.
5. The method for determining the trans-provincial electric power transaction path according to claim 2, wherein the specific method for acquiring all transaction paths between the electricity purchasing node and the electricity selling node and the transmission loss, the transmission price and the available transmission capacity of each transaction path through the preset trans-provincial spot transaction path network is as follows:
determining network nodes to which electricity purchasing nodes and electricity selling nodes belong in a cross-provincial spot goods transaction path network, acquiring transaction channels between the electricity purchasing nodes and the network nodes to which the electricity selling nodes belong through a preset cross-provincial spot goods transaction path network, acquiring all transaction paths in the transaction channels, acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes, and acquiring power transmission network loss, power transmission price and transmission limit of each transaction path between the electricity purchasing nodes and the electricity selling nodes;
and obtaining the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node according to the transmission limit of each transaction path between the electricity purchasing node and the electricity selling node and based on the occupied transmission quantity, the reliability margin and the benefit margin preset by each transaction path between the electricity purchasing node and the electricity selling node.
6. The method according to claim 1, wherein the specific method for obtaining the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node according to the electricity purchasing request price and the transmission grid loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node comprises:
and converting the electricity purchasing request price into the electricity selling node according to the transmission network loss and the transmission price of each trading path between the electricity purchasing node and the electricity selling node to obtain the electricity selling price of each trading path between the electricity purchasing node and the electricity selling node.
7. The method according to claim 1, wherein the specific method for obtaining the trade route combination with the lowest total trade cost according to the electricity purchase request amount and the transmission network loss, the electricity selling price and the available transmission capacity of each trade route between the electricity purchase node and the electricity selling node is as follows:
obtaining available electricity purchasing quantity of each transaction path between the electricity purchasing node and the electricity selling node according to the transmission network loss and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node;
and according to the sequence of the electricity selling prices of all transaction paths between the electricity purchasing nodes and the electricity selling nodes from small to large, sequentially overlapping the available electricity purchasing quantity of all the transaction paths between the electricity purchasing nodes and the electricity selling nodes to be not less than the electricity purchasing declaration quantity, and taking the transaction path combination with the overlapped available electricity purchasing quantity as the transaction path combination with the lowest total transaction cost.
8. A cross-provincial electric power transaction path determination system, comprising:
the acquisition module is used for acquiring electricity purchasing nodes, electricity selling nodes, electricity purchasing applying amount and electricity purchasing applying quotation for performing trans-provincial electricity transaction;
the transaction path acquisition module is used for acquiring all transaction paths between the electricity purchasing nodes and the electricity selling nodes and the transmission network loss, the transmission price and the available transmission capacity of each transaction path between the electricity purchasing nodes and the electricity selling nodes through a preset cross-provincial spot goods transaction path network according to the electricity purchasing nodes and the electricity selling nodes;
the conversion module is used for obtaining the electricity selling price of each transaction path between the electricity purchasing node and the electricity selling node according to the electricity purchasing declaration price and the transmission network loss and the transmission price of each transaction path between the electricity purchasing node and the electricity selling node;
and the transaction path determining module is used for acquiring a transaction path combination with the lowest total transaction cost according to the electricity purchasing reported quantity, the transmission network loss, the electricity selling price and the available transmission quantity of each transaction path between the electricity purchasing node and the electricity selling node, and using the transaction path combination as a trans-provincial electricity transaction path between the electricity purchasing node and the electricity selling node.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the cross-provincial electric power transaction path determination method according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the cross-provincial electric power transaction path determination method according to any one of claims 1 to 7.
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