Power transmission cost recovery method and system

Abstract

The invention relates to the technical field of electric power, and particularly discloses a power transmission cost recovery method and system, and the method comprises the steps: obtaining a forward power flow, a reverse power flow and a power transmission price on a power transmission line; determining a single reverse transaction negative charge of the power transmission line according to the forward power flow, the reverse power flow and the power transmission price; summation is carried out on reverse power flows generated by a plurality of reverse transactions accumulated in the preset time of the power transmission line to obtain accumulated reverse power transmission fee; and summing the accumulated reverse power transmission fees of the plurality of power transmission lines within the preset time to obtain the total amount of the recovered power transmission fees.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method and system for recovering power transmission costs. Background Art

[0002] With the accelerated advancement of spot markets in various provinces across the country, the medium- and long-term contract deviations of market players are exposed to spot market prices. Due to the volatility and uncertainty of new energy, it is urgent to establish a flexible and efficient contract curve adjustment method to reduce its contract deviations.

[0003] At present, the contract adjustment needs of market players in the inter-provincial medium- and long-term markets are mainly realized through single-channel contract transfer, repurchase, replacement and other transaction methods. The communication cost between market players is high, which cannot meet the frequent adjustment needs of market players. It is urgent to study the trading mechanism that supports efficient and flexible adjustment of contract curves. If the needs of market players for contract transfer, repurchase and replacement are considered in the current multi-channel centralized optimization bidding transactions, it will help reduce the communication costs of market players and meet the needs of flexible contract adjustment.

[0004] Since contract transfers may generate a large number of reverse transactions, if both forward and reverse transactions exist on the same DC channel, it will bring difficulties to the recovery of transmission costs. Currently, the inter-provincial channels have one price per line. When medium- and long-term transactions are cleared, their transmission costs are calculated based on the single-direction transaction volume on the DC channel. When forward transactions and reverse transactions coexist, the net flow on the DC channel is lower than the forward transaction flow due to the hedging of forward and reverse flows. The current transmission cost recovery method will bring about the problem of overcharging transmission fees. How to achieve accurate recovery of transmission costs according to the net flow on the DC channel currently lacks a supporting mechanism design. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a method and system for recovering transmission costs, and to construct a model for recovering reverse power transmission fees, in order to provide effective assistance for the construction of a unified national electricity market in my country.

[0006] The present invention provides a method for recovering transmission costs, comprising:

[0007] Obtain the forward power flow, reverse power flow and transmission price on the transmission line;

[0008] Determine the negative charge for a single reverse transaction of a transmission line based on the forward power flow, reverse power flow and transmission price;

[0009] The reverse power flow generated by multiple reverse transactions accumulated within a preset time of the transmission line is summed to obtain the accumulated reverse transmission fee;

[0010] The accumulated reverse transmission charges of multiple transmission lines within a preset time are summed up to obtain the total amount of recovered transmission charges.

[0011] In a possible implementation, determining the negative charge for a single reverse transaction of a transmission line according to the forward power flow, the reverse power flow and the transmission price includes:

[0012] The negative charge for a single reverse transaction on a transmission line is determined according to the following formula:

[0013] Y1=-P T & DL ×F1

[0014] Where P T & DL is the transmission price on transmission line L, and F1 is the reverse power flow on transmission line L.

[0015] In a possible implementation, the reverse power flow generated by the accumulated multiple reverse transactions within the preset time of the transmission line is summed to obtain the accumulated reverse power transmission fee, which includes:

[0016] The cumulative reverse transmission fee is calculated according to the following formula:

[0017]

[0018] Where P T & DL is the transmission price on the transmission line L, F n are the n reverse power flows on the transmission line L.

[0019] In a possible implementation, the cumulative reverse transmission fees of multiple transmission lines within a preset time are summed to obtain the total amount of recovered transmission fees, including:

[0020] The total amount of recovered transmission fees is calculated according to the following formula:

[0021]

[0022] Where P T & DL is the transmission price on the transmission line L, F n are the n reverse flows on the transmission line L, and m is the number of the transmission line.

[0023] In a possible implementation, the method further includes:

[0024] Records are made based on the transmission line ID, reverse power flow, transmission price, preset time, and accumulated reverse transmission fee of the transmission line, and record information is generated.

[0025] The present invention also provides a power transmission cost recovery system, which refers to any of the above-mentioned power transmission cost recovery methods, and comprises:

[0026] An acquisition module is used to obtain the forward power flow, reverse power flow and transmission price on the transmission line;

[0027] A determination module, used for determining a single reverse transaction negative charge of a transmission line according to a forward power flow, a reverse power flow and a transmission price;

[0028] The first summing module is used to sum the reverse power flows generated by multiple reverse transactions accumulated within a preset time of the transmission line to obtain the accumulated reverse transmission fee;

[0029] The second summing module is used to sum the accumulated reverse transmission fees of multiple transmission lines within a preset time to obtain a total amount of recovered transmission fees.

[0030] In a possible implementation, the determination module determines the negative charge for a single reverse transaction of the transmission line according to the following formula:

[0031] Y1=-P T & DL ×F1

[0032] Where P T & DL is the transmission price on transmission line L, and F1 is the reverse power flow on transmission line L.

[0033] In a possible implementation, the first summing module calculates the accumulated reverse transmission fee according to the following formula:

[0034]

[0035] Where P T & DL is the transmission price on the transmission line L, F n are the n reverse power flows on the transmission line L.

[0036] In a possible implementation, the second summing module calculates the total amount of recovered transmission fees according to the following formula:

[0037]

[0038] Where P T & DL is the transmission price on the transmission line L, F n are the n reverse flows on the transmission line L, and m is the number of the transmission line.

[0039] In a possible implementation, the method further includes:

[0040] The recording module is used to record and generate recording information according to the transmission line ID, reverse power flow, transmission price, preset time and accumulated reverse transmission fee of the transmission line.

[0041] The purpose of the present invention is to provide a method and system for recovering transmission costs, which can promote the development of a national unified power market, improve the efficiency conversion of the unified power market, and achieve accurate recovery of transmission costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic flow chart of a method for recovering power transmission costs provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The following detailed description of the embodiments of the present invention is further described in detail in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the preferred embodiments described, and the scope of the present invention is defined by the claims.

[0044] In the description of the present invention, it should be noted that, unless otherwise specified, “plurality” means two or more than two; the terms “first”, “second”, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] Figure 1 A schematic diagram of a flow chart of a transmission cost recovery method provided by an embodiment of the present invention, such as Figure 1 As shown, the present invention provides a method for recovering transmission costs, comprising:

[0046] Step S1, obtaining the forward power flow, reverse power flow and transmission price on the transmission line;

[0047] The flow direction generated by different transactions on the same transmission line in the power market may be different, and each transaction will cause network loss. Generally speaking, the flow that is consistent with the actual flow direction of the transmission line is the positive flow, and the flow that is opposite to the actual flow of the transmission line is the negative flow. Although the reverse flow is relative to the positive flow, it is also an objective existence in the power system.

[0048] In the power system, when there is a main current on the transmission line, the addition of a transaction causes a reverse current on the transmission line, and the reduction in network loss caused by the transaction on the transmission line causing the reverse current is greater than the increase in network loss caused by the transaction on the transmission line where the current direction is consistent with the main current direction, the network loss of the system will be reduced. In this way, the occurrence of reverse current not only increases the transmission capacity of the transmission system, but also has the potential to reduce the network loss of the transmission line.

[0049] Therefore, in the allocation of transmission losses, the reverse flow and the forward flow should be treated equally, and the loss allocation result should be able to reflect the role of the reverse flow. If only the forward flow is considered in the allocation of transmission losses, instead of considering the existence of both the forward flow and the reverse flow, the allocation result will not reflect the true impact of the transaction on the system flow, nor will it reflect the position of the nodes of the two parties to the transaction in the system and the actual operating status of the system.

[0050] The transmission price of regional power grids in my country adopts a two-part electricity price. Among them: the electricity charge reflects the cost of regional power grids to provide transmission services; the capacity charge reflects the cost of regional power grids to provide reliable power supply, emergency standby and other safety services to provincial power grids. The electricity charge is collected according to the actual transaction settlement volume of the regional power grid and is borne by the power purchaser; the capacity charge allocated to each provincial power grid is recovered as the shared cost of the upper power grid through the provincial power grid transmission and distribution price, and is collected according to the terminal sales volume (including market-based volume) of each provincial power grid. The capacity charge paid by each provincial power grid company to the regional power grid is based on the degree to which the regional power grid provides safety and reliability services to each provincial power grid, and is determined by comprehensively considering factors such as cross-regional and cross-provincial transmission (receiving) volume, annual maximum load, inter-provincial interconnection line reserve rate and power supply reliability.

[0051] At present, my country charges reverse power at the same rate as forward power in cross-regional transactions in the spot market, mainly to avoid short-circuit effects; there is no clear method for recovering transmission fees in medium- and long-term transactions. Currently, there is one price for each inter-provincial channel. When medium- and long-term transactions are cleared, the transmission cost is calculated based on the single-direction transaction volume on the DC channel. When forward transactions and reverse transactions coexist, the net power flow on the DC channel is lower than the forward transaction power flow due to the hedging of the forward and reverse power flows. The current transmission cost recovery method will lead to the problem of overcharging transmission fees.

[0052] When there is reverse power transmission, in order to accurately recover the transmission cost according to the net power flow on the DC channel, negative charges are imposed on the reverse power flow on the transmission line, and corresponding benefits are obtained for the transactions that cause the reverse power flow. For the reverse power flow generated by each reverse transaction on the established transmission line in the previous week, cumulative negative charges are imposed, and the transmission fees generated by the cumulative reverse transactions are refunded within the month.

[0053] Step S2, determining a negative charge for a single reverse transaction of the transmission line according to the forward power flow, the reverse power flow and the transmission price;

[0054] In a possible implementation, the negative charge for a single reverse transaction of a transmission line is determined according to the following formula:

[0055] Y1=-P T & DL ×F1

[0056] Where P T & DL is the transmission price on transmission line L, and F1 is the reverse power flow on transmission line L.

[0057] Step S3, summing the reverse power flows generated by multiple reverse transactions accumulated within a preset time of the transmission line to obtain a cumulative reverse transmission fee;

[0058] In one possible implementation,

[0059] The cumulative reverse transmission fee is calculated according to the following formula:

[0060]

[0061] Where P T & DL is the transmission price on the transmission line L, F n are the n reverse power flows on the transmission line L.

[0062] Step S4, summing up the accumulated reverse transmission fees of multiple transmission lines within a preset time to obtain the total amount of recovered transmission fees.

[0063] In one possible implementation,

[0064] The total amount of recovered transmission fees is calculated according to the following formula:

[0065]

[0066] In the formula, p T & DL is the transmission price on the transmission line L, F n are the n reverse flows on the transmission line L, and m is the number of the transmission line.

[0067] In a possible implementation, records are made based on the transmission line ID, reverse power flow, transmission price, preset time and accumulated reverse transmission fee of the transmission line, and record information is generated.

[0068] The present invention also provides a power transmission cost recovery system, which refers to any of the above-mentioned power transmission cost recovery methods, and comprises:

[0069] An acquisition module is used to obtain the forward power flow, reverse power flow and transmission price on the transmission line;

[0070] A determination module, used for determining a single reverse transaction negative charge of a transmission line according to a forward power flow, a reverse power flow and a transmission price;

[0071] The first summing module is used to sum the reverse power flows generated by multiple reverse transactions accumulated within a preset time of the transmission line to obtain the accumulated reverse transmission fee;

[0072] The second summing module is used to sum the accumulated reverse transmission fees of multiple transmission lines within a preset time to obtain a total amount of recovered transmission fees.

[0073] In a possible implementation, the determination module determines the negative charge for a single reverse transaction of the transmission line according to the following formula:

[0074] Y1=-P T & DL ×F1

[0075] Where P T & DL is the transmission price on transmission line L, and F1 is the reverse power flow on transmission line L.

[0076] In a possible implementation, the first summing module calculates the accumulated reverse transmission fee according to the following formula:

[0077]

[0078] Where P T & DL is the transmission price on the transmission line L, F n are the n reverse power flows on the transmission line L.

[0079] In a possible implementation, the second summing module calculates the total amount of recovered transmission fees according to the following formula:

[0080]

[0081] Where P T & DL is the transmission price on the transmission line L, F n are the n reverse flows on the transmission line L, and m is the number of the transmission line.

[0082] In a possible implementation, the method further includes:

[0083] The recording module is used to record and generate recording information according to the transmission line ID, reverse power flow, transmission price, preset time and accumulated reverse transmission fee of the transmission line.

[0084] The transmission cost recovery method and system proposed in the present invention mainly include the benefits generated by reverse power flow, the transmission fee recovery strategy for contract bidding transfer under inter-provincial multi-channel transactions, and the construction of a transmission fee recovery model for contract bidding transfer under inter-provincial multi-channel transactions. In the reverse power flow benefit section, the causes of the reverse power flow and the positive effects brought by the reverse power flow are explained, which clarifies the importance of the reverse power flow; in the transmission fee recovery strategy and model section for contract bidding transfer under inter-provincial multi-channel transactions, the processing method of a single reverse power flow and the processing method of the accumulated reverse power flow on a single UHV DC transmission line are specifically described, and the specific method is characterized by a mathematical model. The technology of the present invention can accurately recover the excess transmission fee collection generated by contract bidding transfer under inter-provincial multi-channel transactions, which is conducive to the construction of a unified national power market in cross-provincial and cross-regional transactions.

[0085] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for recovering transmission costs, characterized in that: include: Obtain the forward power flow, reverse power flow and transmission price on the transmission line; Determine the negative charge for a single reverse transaction of a transmission line based on the forward power flow, reverse power flow and transmission price; The reverse power flow generated by multiple reverse transactions accumulated within a preset time of the transmission line is summed to obtain the accumulated reverse transmission fee; The accumulated reverse transmission charges of multiple transmission lines within a preset time are summed up to obtain the total amount of recovered transmission charges.

2. The method for recovering transmission costs according to claim 1, characterized in that: The negative charge for a single reverse transaction of a transmission line is determined based on the forward power flow, the reverse power flow and the transmission price, including: The negative charge for a single reverse transaction on a transmission line is determined according to the following formula: Y1=-P T&DL ×F1 Where P T&DL is the transmission price on transmission line L, and F1 is the reverse power flow on transmission line L.

3. The method for recovering transmission costs according to claim 1, characterized in that: The reverse power flow generated by the accumulated multiple reverse transactions within the preset time of the transmission line is summed to obtain the accumulated reverse power transmission fee, which includes: The cumulative reverse transmission fee is calculated according to the following formula: Where P T&DL is the transmission price on the transmission line L, F n are the n reverse power flows on the transmission line L.

4. The method for recovering transmission costs according to claim 1, characterized in that: The total amount of recovered transmission fees obtained by summing up the accumulated reverse transmission fees of multiple transmission lines within a preset time period includes: The total amount of recovered transmission fees is calculated according to the following formula: Where P T&DL is the transmission price on the transmission line L, F n are the n reverse flows on the transmission line L, and m is the number of the transmission line.

5. The method for recovering transmission costs according to claim 1, characterized in that: Also includes: Records are made based on the transmission line ID, reverse power flow, transmission price, preset time, and accumulated reverse transmission fee of the transmission line, and record information is generated.

6. A power transmission cost recovery system, using the power transmission cost recovery method of claim 1, characterized in that: include: An acquisition module is used to obtain the forward power flow, reverse power flow and transmission price on the transmission line; A determination module, used for determining a single reverse transaction negative charge of a transmission line according to a forward power flow, a reverse power flow and a transmission price; The first summing module is used to sum the reverse power flows generated by multiple reverse transactions accumulated within a preset time of the transmission line to obtain the accumulated reverse transmission fee; The second summing module is used to sum the accumulated reverse transmission fees of multiple transmission lines within a preset time to obtain a total amount of recovered transmission fees.

7. The transmission cost recovery system according to claim 6, characterized in that: The determination module determines the negative charge for a single reverse transaction of a transmission line according to the following formula: Y1=-P T&DL ×F1 Where P T&DL is the transmission price on transmission line L, and F1 is the reverse power flow on transmission line L.

8. The transmission cost recovery system according to claim 6, characterized in that: The first summation module calculates the accumulated reverse transmission fee according to the following formula: Where P T&DL is the transmission price on the transmission line L, F n are the n reverse power flows on the transmission line L.

9. The transmission cost recovery system according to claim 6, characterized in that: The second summation module calculates the total amount of recovered transmission fees according to the following formula: Where P T&DL is the transmission price on the transmission line L, F n are the n reverse flows on the transmission line L, and m is the number of the transmission line.

10. The transmission cost recovery system according to claim 6, characterized in that: Also includes: The recording module is used to record and generate recording information according to the transmission line ID, reverse power flow, transmission price, preset time and accumulated reverse transmission fee of the transmission line.

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