CN111080450A - Transaction mode evaluation method based on multi-region interconnected power system - Google Patents
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Abstract
The invention belongs to the technical field of electric power transaction modes and evaluation methods, particularly relates to a transaction mode evaluation method based on a multi-region interconnected electric power system, and particularly relates to a transaction mode evaluation method of a multi-region interconnected electric power system. The invention comprises the following steps: establishing a bilateral transaction model of a multi-region interconnected power system; establishing a block chain technology-based multi-region interconnected power system bilateral transaction framework based on a multi-region interconnected power system bilateral transaction model; embedding a network loss sharing method under a bilateral transaction framework intelligent contract system of a multi-region interconnected power system; and introducing a peak-valley electricity price principle to realize the sectional proportion sharing of the grid loss electricity price. The method can effectively adapt to a multi-region interconnected power system with high distributed energy occupation ratio, establishes a transaction framework based on a block chain architecture, enriches the connotation of an intelligent contract and improves the precision of network loss sharing. And a solution is provided for electricity price accounting and transaction decision.
Description
Technical Field
The invention belongs to the technical field of electric power transaction modes and evaluation methods, particularly relates to a transaction mode evaluation method based on a multi-region interconnected electric power system, and particularly relates to a transaction mode evaluation method of a multi-region interconnected electric power system.
Background
With the market-oriented transaction promotion of distributed power generation, the market prospect of future distributed power supply transaction is wide. The characteristics of decentralization, public transparency, safety, credibility and the like of the block chain technology can seamlessly meet the requirements of future distributed power supply marketization transactions on transaction basic environments.
At present, the power transformation of the signs is accelerated along with the rapid development of new energy sources such as wind power, photovoltaic power generation and the like in the world, and the power grid construction and development also meet new periods. Grid interconnection is the main melody of grid development. The interconnection of the power grid ensures the development and utilization of large-capacity units, large hydropower, nuclear power and renewable energy, reduces the standby capacity of the system, realizes the large-range optimal configuration of energy resources, and improves the efficiency and the safety and the reliability of the power grid. Introduction of competition to improve efficiency is a major goal of the power industry to move from monopoly to market. The generators and users may participate in market competition through either a centralized bidding or a two-sided trading format. Because the bilateral transaction is a contract of price and electric quantity signed by the power generator and the user in advance, the rapid development of the bilateral transaction plays an important role in promoting the stable development of the electric power market and fully playing the resource allocation function of the interconnected electric power system. At present, a large-proportion bilateral transaction mode is generally adopted in various countries of the world in the power market. However, the appearance of bilateral transaction also brings new problems in the aspects of market transaction mode, power transmission pricing, network loss allocation, blocking management and the like, and a corresponding theory and method are needed. The interconnection of power grids and the electric power market are two hot problems in the development of the electric power industry, the interconnection power grids of China are gradually formed at present, and cross-regional transactions are increasingly increased. Because the electric power market in China starts late, the problems of electric power transaction settlement, network loss allocation and the like are lack of mature experiences.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a transaction mode evaluation method based on a multi-region interconnected power system, and aims to realize the network loss sharing and the calculation and generation of intelligent contracts under the environment of the multi-region interconnected power system and realize the purpose of effectively developing electric energy transaction decisions.
Based on the above purpose, the invention is realized by the following technical scheme:
a transaction mode evaluation method based on a multi-region interconnected power system comprises the following steps:
and 4, introducing a peak-valley electricity price principle to realize the sectional proportion sharing of the grid loss electricity price.
The establishment of the bilateral transaction model of the multi-region interconnected power system in the step 1 comprises the following steps:
selecting a proper branch according to bilateral transaction to decompose and redraw the physical network into a radial network comprising all nodes, and enabling parallel flow generated by the bilateral transaction to be equivalent to a reserved branch network so as to construct an association model of all bilateral transactions and physical paths; for bilateral transaction between A and B, when the contract path is designated as a branch A-B, the original network load flow result obtained by calculation according to the transaction assignment method is in accordance with the reality; establishing a tree type network model reflecting the bilateral transaction contract amount and the contract path by using a network splitting method, establishing a relation between bilateral transaction network power flow and original network power flow by assigning corresponding contract power on the tree branches of the converted bilateral transaction network, and finally establishing a corresponding relation between the contract power, the contract path and actual branch power flow by using the network splitting method.
The electric energy transaction architecture of the reconstruction region interconnected power system comprises the following steps:
(1) abstracting transaction main bodies of all parties into independent transaction nodes, wherein each node stores all transaction records, all the nodes maintain transaction data together, and each transaction main body is regarded as a peer node to realize point-to-point transaction;
(2) both sides trade directly in the point-to-point trade;
(3) all transactions are based on smart contracts;
(4) all transaction operations are automatically executed after meeting the conditions;
(5) a prioritization policy is added.
The transaction main bodies of all parties comprise a power supply, a power grid enterprise and a power consumer.
The intelligent contract comprises transaction electric quantity, settlement price and settlement time and is coded by an encryption algorithm.
The network loss allocation method in the step 3 comprises the following steps:
step (1): obtaining a bilateral transaction network and a transaction transfer distribution factor matrix by adopting a network splitting method;
step (2): performing alternating current power flow calculation on the original network in a given bilateral transaction operation mode to obtain branch active power and active network loss in the original network a;
and (3): in order to obtain the network loss which should be shared by each group of transactions, calculating to obtain the load flow contribution of the group of transactions to each branch of the original network a; calculating the sum of the network loss caused in each branch of the original network;
and (4): and finally, the network loss to be shared by the transaction is obtained by utilizing the conclusion that the active loss of the branch circuit is in direct proportion to the active power flowing over the branch circuit.
And step 4, introducing a peak-valley electricity price principle to realize the subsection proportion sharing of the grid loss electricity price, and comprising the following steps of: the block chain intelligent contract comprises a transaction time element, peak-valley electricity prices are introduced according to different transaction times, the grid loss electricity prices are calculated on the premise of reasonably distributing grid loss, and an intelligent contract system under a multi-region interconnected power system bilateral transaction framework based on a block chain technology is perfected.
The invention has the following advantages and beneficial effects:
the method can effectively adapt to a multi-region interconnected power system with high distributed energy occupation ratio, establishes a transaction framework based on a block chain architecture, enriches the connotation of an intelligent contract, improves the network loss sharing accuracy, introduces peak valley electricity price into a network loss sharing link, effectively improves the referential of transaction decision, and provides a solution for electricity price accounting and transaction decision.
What the block chain does is to utilize decentralized distributed account book technology, and through intelligent contracts, consensus mechanisms, encryption algorithms and the like, to construct the existing energy production and consumption modes in multiple dimensions such as commercial trust, value transfer, transaction clearing and settlement and the like, and to construct the bottom layer framework of a new energy commercial system. Firstly, each node in the energy internet can become an independent producer and seller, energy source flow, information flow and value flow are mutually exchanged in a decentralized mode, all main bodies are equally and dispersedly decided, decentralized attributes of a block chain technology can be matched with the structure, and rights and obligations of all nodes are equal. Secondly, the characteristic that the blockchain technology is not tampered with enables the diversified energy markets to achieve trusted point-to-point value transfer without a trust mechanism of a third party. Thirdly, the intelligent contract function developed based on the block chain can enable the execution of the contract to be intelligent and automatic, and electricity purchasing and selling transactions, demand side responses and the like can be achieved through the intelligent contract of the block chain.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the invention and are not to be construed as limiting the invention to all embodiments thereof.
Fig. 1 is a model of a multi-zone interconnected power system in accordance with the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a transaction mode evaluation method based on a multi-region interconnected power system, as shown in fig. 1, fig. 1 is a multi-region interconnected power system model in the invention.
The invention specifically comprises the following steps:
and 2, establishing a block chain technology-based bilateral transaction framework of the multi-region interconnected power system based on the bilateral transaction model of the multi-region interconnected power system.
and 4, introducing a peak-valley electricity price principle to realize the sectional proportion sharing of the grid loss electricity price.
The step 1, establishing a bilateral transaction model of the multi-region interconnected power system, comprising the following steps:
the network splitting suitable for bilateral transaction aims at establishing the relationship between each transaction and an actual physical network, namely, a proper branch is selected according to bilateral transaction to decompose and redraw the physical network into a radial network comprising all nodes, parallel flow generated by bilateral transaction is equivalent to a reserved branch network, and then an association model of all bilateral transactions and physical paths is established. For bilateral transaction between A and B, when the contract path is designated as a branch A-B, the original network load flow result obtained by calculation according to the transaction assignment method is in accordance with reality. A tree type network model reflecting the bilateral transaction contract amount and the contract path can be established by using a network splitting method, corresponding contract power is assigned to the tree branches of the converted bilateral transaction network, the relationship between the bilateral transaction network trend and the original network trend is established, and finally the corresponding relationship among the contract power, the contract path and the actual branch trend is established by using the network splitting method.
The step 2, based on the multi-region interconnected power system bilateral transaction model, establishing a block chain technology-based multi-region interconnected power system bilateral transaction framework, including:
the technical characteristics of peer-to-peer, safe, credible, public and transparent of the block chain can seamlessly meet market transaction requirements of the multi-region interconnected power system, and the block chain technology is introduced to reconstruct an electric energy transaction framework of the region interconnected power system.
(1) As shown in fig. 1, transaction subjects including a power source, a power grid enterprise, a power consumer, and the like in fig. 1 may be abstracted into individual transaction nodes, each node stores all transaction records, and all nodes maintain transaction data together. Thus, each transaction body is regarded as a peer node, and point-to-point transaction is realized.
(2) In the point-to-point transaction, both parties trade directly without any third party.
(3) All transactions are based on intelligent contracts, and the intelligent contracts comprise contents such as transaction electric quantity, settlement price, settlement time and the like and are coded by encryption algorithms.
(4) All transaction operations are automatically executed after meeting the conditions without any manual intervention.
(5) A prioritization strategy is added to prevent network congestion during broadcast of multiple transactions.
The bilateral transaction framework based on the block chain technology is constructed, and the core technology of the bilateral transaction framework is the compilation of an encryption algorithm and the generation of an intelligent contract. The encryption algorithm is the guarantee of the fairness and the confidentiality of the block chain technology, and the calculation of the transaction related data in the intelligent contract is the basic guarantee of the electric energy transaction.
The step 3, embedding a network loss sharing method under a bilateral transaction framework intelligent contract system of the multi-region interconnected power system, comprising the following steps:
grid losses are generated in the case where the grid is used in common for all power transactions and are an important component of the cost of transmitting power. Theoretically, the distribution should be made according to the principle of "who causes and who is responsible" and the use degree of the transmission line by each power load or transaction. In the total network loss of the system, the network loss part generated by the independent action of each transaction and the cross network loss generated by the interaction between the transactions exist. The network loss cost is distributed to market members and embedded into an intelligent contract system, which is an important step for further perfecting and innovating a bilateral transaction method of a multi-region interconnected power system.
The basic idea of apportionment of transactions is to follow the branch power proportion sharing principle, that is, apportionment is performed according to the proportion of each transaction flow in each branch power flow. Since the active loss on the branch is in direct proportion to the active power flowing through the branch, the power flow distribution caused by the transaction in each branch can be calculated, and then the power flow distribution is divided according to the proportion of the respective power flow in the capacity of the branch.
Therefore, the circulation path of bilateral transaction flows of the multi-region interconnected power system in the actual network is simulated, the essence is that the flow of the branch is assumed to be formed by mixing the flows of all transactions, and the proportion of the network loss to the total network loss is the same as the proportion of the flow of each transaction to the total flow.
The method for distributing the network loss is to apply the network splitting method in the step 1 to distribute the network loss, and the method for distributing the network loss specifically comprises the following steps:
step (1): obtaining a bilateral transaction network and a transaction transfer distribution factor matrix by adopting a network splitting method;
step (2): performing alternating current power flow calculation on the original network in a given bilateral transaction operation mode to obtain branch active power and active network loss in the original network a;
and (3): in order to obtain the network loss which should be shared by each group of transactions, the trend contribution of the group of transactions to each branch of the original network a is calculated. Accordingly, the sum of the network losses caused in the branches of the original network is calculated.
And (4): because the network splitting method is carried out on the premise of the assumption of direct current power flow, the conclusion that the active loss of the branch is in direct proportion to the active power flowing through the branch can be utilized on the basis, and finally the network loss to be shared by the transaction is obtained.
The network division method is applied to carry out network loss allocation to obtain specific algorithm description, the algorithm can effectively improve the integrity and the practicability of a block chain intelligent contract system, effectively improve the feature description content of each node in a block chain, and realize the establishment and the improvement of a bilateral transaction framework of a multi-region interconnected power system.
And 4, introducing a peak-valley electricity price principle to realize the sectional proportion sharing of the grid loss electricity price.
The block chain intelligent contract comprises a transaction time element, peak-valley electricity prices are introduced according to different transaction times, on the premise of reasonably distributing the grid loss, the grid loss electricity prices with economic reference significance are calculated, and an intelligent contract system under a multi-region interconnected power system bilateral transaction framework based on the block chain technology is further perfected.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A transaction mode evaluation method based on a multi-region interconnected power system is characterized by comprising the following steps: the method comprises the following steps:
step 1, establishing a bilateral transaction model of a multi-region interconnected power system;
step 2, establishing a block chain technology-based multi-region interconnected electric power system bilateral transaction framework based on a multi-region interconnected electric power system bilateral transaction model;
step 3, embedding a network loss sharing method under a bilateral transaction framework intelligent contract system of the multi-region interconnected power system;
and 4, introducing a peak-valley electricity price principle to realize the sectional proportion sharing of the grid loss electricity price.
2. The method as claimed in claim 1, wherein the transaction mode evaluation method based on the multi-region interconnected power system comprises: the establishment of the bilateral transaction model of the multi-region interconnected power system in the step 1 comprises the following steps:
selecting a proper branch according to bilateral transaction to decompose and redraw the physical network into a radial network comprising all nodes, and enabling parallel flow generated by the bilateral transaction to be equivalent to a reserved branch network so as to construct an association model of all bilateral transactions and physical paths; for bilateral transaction between A and B, when the contract path is designated as a branch A-B, the original network load flow result obtained by calculation according to the transaction assignment method is in accordance with the reality; establishing a tree type network model reflecting the bilateral transaction contract amount and the contract path by using a network splitting method, establishing a relation between bilateral transaction network power flow and original network power flow by assigning corresponding contract power on the tree branches of the converted bilateral transaction network, and finally establishing a corresponding relation between the contract power, the contract path and actual branch power flow by using the network splitting method.
3. The method as claimed in claim 1, wherein the transaction mode evaluation method based on the multi-region interconnected power system comprises: step 2, based on the multi-region interconnected power system bilateral transaction model, establishing a multi-region interconnected power system bilateral transaction framework based on the block chain technology, including: and seamlessly butting the marketized trading requirements of the multi-region interconnected power system, and reconstructing the electric energy trading architecture of the region interconnected power system by introducing a block chain technology.
4. The method as claimed in claim 3, wherein the transaction mode evaluation method based on the multi-region interconnected power system comprises: the electric energy transaction architecture of the reconstruction region interconnected power system comprises the following steps:
(1) abstracting transaction main bodies of all parties into independent transaction nodes, wherein each node stores all transaction records, all the nodes maintain transaction data together, and each transaction main body is regarded as a peer node to realize point-to-point transaction;
(2) both sides trade directly in the point-to-point trade;
(3) all transactions are based on smart contracts;
(4) all transaction operations are automatically executed after meeting the conditions;
(5) a prioritization policy is added.
5. The method as claimed in claim 4, wherein the transaction mode evaluation method based on the multi-region interconnected power system comprises: the transaction main bodies of all parties comprise a power supply, a power grid enterprise and a power consumer.
6. The method as claimed in claim 4, wherein the transaction mode evaluation method based on the multi-region interconnected power system comprises: the intelligent contract comprises transaction electric quantity, settlement price and settlement time and is coded by an encryption algorithm.
7. The method as claimed in claim 1, wherein the transaction mode evaluation method based on the multi-region interconnected power system comprises: the network loss allocation method in the step 3 comprises the following steps:
step (1): obtaining a bilateral transaction network and a transaction transfer distribution factor matrix by adopting a network splitting method;
step (2): performing alternating current power flow calculation on the original network in a given bilateral transaction operation mode to obtain branch active power and active network loss in the original network a;
and (3): in order to obtain the network loss which should be shared by each group of transactions, calculating to obtain the load flow contribution of the group of transactions to each branch of the original network a; calculating the sum of the network loss caused in each branch of the original network;
and (4): and finally, the network loss to be shared by the transaction is obtained by utilizing the conclusion that the active loss of the branch circuit is in direct proportion to the active power flowing over the branch circuit.
8. The method as claimed in claim 1, wherein the transaction mode evaluation method based on the multi-region interconnected power system comprises: and step 4, introducing a peak-valley electricity price principle to realize the subsection proportion sharing of the grid loss electricity price, and comprising the following steps of: the block chain intelligent contract comprises a transaction time element, peak-valley electricity prices are introduced according to different transaction times, the grid loss electricity prices are calculated on the premise of reasonably distributing grid loss, and an intelligent contract system under a multi-region interconnected power system bilateral transaction framework based on a block chain technology is perfected.
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| CN111737367A (en) * | 2020-07-24 | 2020-10-02 | 国网区块链科技(北京)有限公司 | Chain network fused distributed energy station information processing method and device |
| CN111831756A (en) * | 2020-07-28 | 2020-10-27 | 北京融链科技有限公司 | Hydrogenation data processing method and device |
| CN112421627A (en) * | 2020-11-23 | 2021-02-26 | 广东电网有限责任公司佛山供电局 | Distribution network loss allocation method considering distributed power supply |
| CN112421627B (en) * | 2020-11-23 | 2023-03-24 | 广东电网有限责任公司佛山供电局 | Distribution network loss allocation method considering distributed power supply |
| CN114021958A (en) * | 2021-11-03 | 2022-02-08 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | Line loss sharing method for connecting distributed power supply to power distribution network |
| CN114021958B (en) * | 2021-11-03 | 2024-09-06 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | Line loss allocation method for distributed power supply access power distribution network |
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