Coal and electricity price linkage method for medium-and-long-term transaction of electric power of thermal power enterprise and coal enterprise

Abstract

The invention relates to the technical field of automatic control of a power system, in particular to a coal power price linkage method for medium and long-term transaction of power of a thermal power enterprise and a coal enterprise, which comprises the following steps: S1, collecting data; s2, calculating a reference coal price index corresponding to the coal-fired power generation reference on-grid electricity price; s3, calculating a floating transaction price; s4, calculating the fluctuation ratio of the coal price index; s5, calculating monthly concentrated bidding transaction price fluctuation rates of adjacent three months; s6, calculating a contract floating clause price; s7, determining a reference transaction price; s8, calculating a transaction electricity price; s9, settlement and default processing: the thermal power enterprise and the coal enterprise perform settlement according to the transaction electricity price, and if one of the enterprises breaks a default, the default party needs to pay the electricity price floating clause cost; according to the invention, the transaction risk of thermal power enterprises and coal enterprises is effectively reduced, and the performance of long-term contracts in power and the safety and stability of power supply are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automatic control, and in particular to a method for linking coal-electricity prices in medium- and long-term power transactions between a thermal power enterprise and a coal enterprise. Background Art

[0002] With the continuous deepening of my country's power system reform and the continuous improvement of market system construction, the market-oriented trading opportunities for coal-electricity are increasing, coal market transactions are becoming more active, and coal prices are fluctuating more frequently, which in turn leads to increased transaction risks between thermal power companies and coal companies in the medium and long term, and difficulties in fulfilling medium and long-term contracts, which has a great impact on the security of power supply. Under this circumstance, the formation of a scientific and reasonable coal-electricity linkage method can effectively reduce the transaction risks between thermal power companies and coal companies, better ensure the standardized and orderly development of medium and long-term transactions between coal companies and coal-fired power generation companies, safeguard the legitimate rights and interests of all parties to the transaction, and ensure the smooth implementation of market-oriented transactions.

[0003] At present, there are few studies on the coal-electricity linkage method between thermal power companies and coal companies. The existing coal-electricity linkage method is mainly aimed at thermal power companies and all electricity users, and floats with reference to the coal price index. It does not link the participants in coal-electricity transactions, nor does it take into account changes in the electricity price market. In order to solve the transaction risks brought about by coal price changes to thermal power companies and coal companies, it is necessary to study the coal-electricity price linkage method for medium- and long-term electricity transactions between thermal power companies and coal companies. Summary of the invention

[0004] Based on the above purpose, the present invention provides a method for linking coal-electricity prices in medium- and long-term electricity transactions between thermal power companies and coal companies.

[0005] A method for linking coal-electricity prices in medium- and long-term power transactions between a thermal power company and a coal company, comprising the following steps:

[0006] S1, data collection: collect data on medium- and long-term contracts signed between thermal power companies and coal companies, coal consumption and coal calorific value of power generation units, reasonable proportion of coal cost per kilowatt-hour to total cost per kilowatt-hour, benchmark on-grid electricity price for coal-fired power generation, coal price index, and monthly centralized bidding transaction price data;

[0007] S2, calculate the benchmark coal price index: calculate the benchmark coal price index corresponding to the benchmark on-grid electricity price of coal-fired power generation according to the power supply coal consumption of the unit and the calorific value of coal;

[0008] S3, calculation of floating transaction price: calculation of floating transaction price based on the benchmark coal price index, the coal price index at the time of power delivery, the reasonable proportion of coal cost per kWh to the total cost per kWh, and the benchmark on-grid electricity price for coal-fired power generation;

[0009] S4, calculate the volatility of the coal price index: calculate the volatility of the coal price index from the signing of the contract to the power delivery based on the published coal price index;

[0010] S5, calculate the volatility of the auction transaction price: calculate the volatility of the monthly centralized auction transaction price for the three consecutive months based on the monthly centralized auction transaction price data;

[0011] S6, calculate the contract floating clause price: calculate the contract floating clause price based on the floating transaction price, the monthly centralized bidding transaction price volatility, the coal price index volatility during the contract period and the contract term;

[0012] S7, determine the benchmark transaction price: determine the benchmark transaction price based on the contract signed between the coal enterprise and the coal-fired power plant;

[0013] S8, calculate the transaction electricity price: calculate the transaction electricity price based on the changes in coal prices and the contract signing between coal enterprises and coal-fired power plants;

[0014] S9, Settlement and breach of contract handling: Thermal power companies and coal companies settle according to the transaction electricity price. If one party breaches the contract, the breaching party must pay the electricity price floating clause fee.

[0015] Optionally, the calculation formula of the benchmark coal price index in S2 is:

[0016]

[0017] in, is the benchmark coal price index, is the benchmark on-grid electricity price for coal-fired power generation, a 0 is the calorific value of standard coal, is the calorific value of the corresponding coal, m is the coal consumption of the coal-fired unit, k is ec It is a reasonable proportion of coal costs for power generation enterprises.

[0018] Optionally, the calculation formula of the floating transaction price in S3 is:

[0019]

[0020] in, is the floating transaction price, It is the coal price index at the time of electricity delivery.

[0021] Optionally, the calculation formula of the coal price index volatility in S4 is:

[0022]

[0023] Among them, λ is the volatility of coal price index, σ coal is the standard deviation of the coal price index, is the coal price index for the i-th period, n is the number of periods of coal price index published from the signing of the contract to the power delivery, and D is the number of days from the signing of the contract to the power delivery.

[0024] Optionally, the calculation formula for the monthly centralized auction transaction price volatility in S5 is:

[0025]

[0026] Among them, γ is the monthly centralized auction transaction price volatility, σ e is the monthly centralized auction transaction price standard deviation, is the monthly centralized bidding transaction price in the jth month.

[0027] Optionally, the calculation formula for the contract floating clause price in S6 is:

[0028]

[0029] Among them, OP is the floating term price of the contract, e is a natural constant, and Δt is the contract term.

[0030] Optionally, the determining of the benchmark transaction price in S7 includes:

[0031] S71, determine the floating terms: define the floating terms of the electricity price signed between thermal power enterprises and coal enterprises, expressed as:

[0032]

[0033] S72, determine the price reduction clause: define the price reduction clause signed between coal enterprises and thermal power enterprises, expressed as:

[0034]

[0035] S73, No electricity price floating clause: defines the coal enterprise and the thermal power enterprise that have not signed an electricity price floating clause, expressed as:

[0036]

[0037] in, The benchmark transaction price.

[0038] Optionally, the calculating of the transaction electricity price in S8 includes:

[0039] S81, Coal price changes and contract floating clauses: When coal prices rise and thermal power companies sign contracts with coal companies to increase electricity prices, or when coal prices fall and thermal power companies sign contracts with coal companies to decrease electricity prices, the formula for calculating the transaction electricity price is:

[0040]

[0041] Among them, P e For trading electricity prices;

[0042] S82, coal price changes but no matching floating clause: When coal price changes and thermal power enterprises and coal enterprises have not signed floating clauses, or coal price rises and contracts are signed with electricity price reduction clauses, or coal price falls and contracts are signed with electricity price increase clauses, the calculation formula for the transaction electricity price is:

[0043]

[0044] Optionally, the calculation formula for the transaction electricity price settlement in S9 is:

[0045] C e =P e *Q;

[0046] Among them, C e is the electricity cost of the coal enterprise, and Q is the medium- and long-term contract electricity.

[0047] Optionally, the calculation formula for the electricity price floating clause fee in S9 is:

[0048] C OP =OP*Q;

[0049] Among them, C OP This is the fee for the floating electricity price clause.

[0050] Beneficial effects of the present invention:

[0051] The present invention, through systematic data collection and analysis, comprehensively considers various variable factors in medium- and long-term transactions between thermal power companies and coal companies, including coal consumption, coal calorific value, benchmark on-grid electricity price for coal-fired power generation, coal price index, and monthly centralized bidding transaction price, etc. By accurately calculating the benchmark coal price index, floating transaction price, coal price index volatility, and competitive transaction price volatility, the benchmark transaction price and the contract floating clause price can be scientifically and reasonably determined. This method effectively reduces the transaction risks between thermal power companies and coal companies when coal prices fluctuate frequently, and ensures the performance of medium- and long-term electricity contracts and the safety and stability of electricity supply.

[0052] The present invention, by considering the matching of coal price changes and electricity price floating clauses, reasonably handles the situation of electricity price floating up or down when coal prices rise or fall, as well as the situation of coal price changes but no matching floating clauses. This processing method not only ensures the fairness and rationality of transaction electricity prices, but also safeguards the legitimate rights and interests of both coal enterprises and thermal power enterprises, promotes the standardized and orderly development of coal-electricity market-oriented transactions, and improves the smooth implementation rate of market-oriented transactions. In addition, by clarifying the calculation formulas for settlement and default handling, it standardizes the settlement process and default handling methods of the two parties to the transaction, reduces transaction disputes, and ensures the stability and sustainable development of the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 The figure is a flowchart of the linkage method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0056] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0057] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0058] like Figure 1 As shown, a method for linking coal-electricity prices in medium- and long-term power transactions between thermal power companies and coal companies includes the following steps:

[0059] (1) Collect data on the benchmark on-grid electricity price for coal-fired power generation in a certain region, coal price index, monthly centralized bidding transaction price, power generation coal consumption and coal calorific value of the units, the reasonable proportion of coal cost per kilowatt-hour to the total cost per kilowatt-hour, and medium- and long-term contracts signed between thermal power companies and coal companies.

[0060] (2) The benchmark coal price index corresponding to the benchmark on-grid electricity price for coal-fired power generation is calculated based on the power generation coal consumption and coal calorific value of the unit. The calculation method is as follows:

[0061]

[0062] In the formula, is the benchmark coal price index; is the benchmark on-grid electricity price for coal-fired power generation, a 0 is the calorific value of standard coal, is the calorific value of the corresponding coal, m is the coal consumption of the coal-fired unit, k is ec It is a reasonable proportion of coal costs for power generation enterprises.

[0063] (3) The floating transaction price is calculated based on the benchmark coal price index, the coal price index at the time of power delivery, the reasonable proportion of coal cost per kWh to the total cost per kWh, and the benchmark on-grid electricity price for coal-fired power generation. The calculation method is as follows:

[0064]

[0065] Where: is the floating transaction price; It is the coal price index at the time of electricity delivery.

[0066] (4) Based on the coal price index published during the period from contract signing to power delivery, calculate the volatility of the coal price index during the period from contract signing to power delivery. The calculation method is as follows:

[0067]

[0068] Where, λ is the volatility of coal price index; σ coal is the standard deviation of the coal price index, is the coal price index for the i-th period, n is the number of periods of coal price index published from the signing of the contract to the power delivery, and D is the number of days from the signing of the contract to the power delivery.

[0069] (5) Based on the monthly centralized auction transaction price data for the past three months at the time of contract delivery, calculate the monthly centralized auction transaction price volatility as follows:

[0070]

[0071] Where, γ is the monthly centralized auction transaction price volatility; σ e is the monthly centralized auction transaction price standard deviation, is the monthly centralized bidding transaction price in the jth month.

[0072] (6) The floating clause price of the contract is calculated based on the floating transaction price, the volatility of the monthly centralized bidding transaction price in the past three months, the volatility of the coal price index during the contract period, and the contract term. The calculation method is as follows:

[0073]

[0074] Where OP is the floating clause price of the contract; e is a natural constant; Δt is the contract term.

[0075] (7) The benchmark transaction price is determined based on the contract signed between coal enterprises and coal-fired power plants. The specific calculation method is as follows:

[0076] When thermal power companies sign a power price increase agreement with coal companies:

[0077]

[0078] When coal enterprises sign a price reduction clause with thermal power enterprises:

[0079]

[0080] When the coal enterprise and the thermal power enterprise have not signed a floating electricity price clause:

[0081]

[0082] Where: The benchmark transaction price.

[0083] (8) The transaction electricity price is calculated based on the changes in coal prices and the contractual conditions between coal enterprises and coal-fired power plants. The calculation method is as follows:

[0084] When coal prices rise and thermal power companies sign a power price increase agreement with coal companies, or when coal prices fall and thermal power companies sign a power price decrease agreement with coal companies:

[0085]

[0086] Other situations (when coal prices change and thermal power companies and coal companies have not signed floating clauses, coal prices rise but the contract is for electricity price reduction clauses, or coal prices fall but the contract is for electricity price increase clauses):

[0087]

[0088] Where P e The transaction price.

[0089] (9) Thermal power companies and coal companies settle accounts based on the transaction electricity price. The settlement method is as follows:

[0090] C e =P e *Q;

[0091] In the formula, C e is the electricity cost of the coal enterprise, and Q is the medium- and long-term contract electricity.

[0092] (10) If one party breaches the contract, the breaching party shall pay the electricity price floating clause fee, which is calculated as follows:

[0093] C OP =OP*Q;

[0094] In the formula, C OP This is the fee for the floating electricity price clause.

[0095] The following are some examples:

[0096] Taking the medium- and long-term contract data signed between thermal power companies and coal companies in a certain region as an example, a coal-electricity price linkage plan for medium- and long-term electricity transactions between thermal power companies and coal companies was simulated.

[0097] (1) Collect the data on medium- and long-term power contracts between thermal power companies and coal companies in the region, the coal price index for each month within the contract period, and the monthly centralized bidding transaction price data for the past three months, as shown in Tables 1, 2, and 3 respectively:

[0098] Table 1 Data on medium- and long-term power contracts between thermal power companies and coal companies

[0099]

[0100] Table 2 Bohai Rim Thermal Coal Price Index (Unit: Yuan / ton)

[0101]

[0102] Table 3 Monthly centralized bidding electricity prices in the past three months

[0103]

[0104] (2) The benchmark on-grid electricity price for coal-fired power generation in the region is 0.2829 yuan / kW·h, the reasonable proportion of coal costs for power generation enterprises is 65%, and the coal consumption of the units is 380g / kW·h. BSPI is selected as the basis for linkage, and its corresponding coal calorific value is 5500kCal / kg, and the coal calorific value corresponding to standard coal is 7000kCal / kg. The benchmark coal price index corresponding to the benchmark on-grid electricity price for coal-fired power generation is calculated to be 380 yuan / ton.

[0105] (3) Based on the benchmark coal price index, the coal price index at the time of power delivery, the reasonable proportion of coal cost per kilowatt-hour to the total cost per kilowatt-hour, and the benchmark on-grid electricity price for coal-fired power generation, the floating transaction price is calculated to be RMB 0.1636 / kW·h.

[0106] (4) According to the data in Tables 2 and 3, it is calculated that the volatility of the coal price index during the contract period is 11.46%, and the volatility of the monthly centralized bidding transaction price in the past three months is 2.56%.

[0107] (5) Based on the floating transaction price, the volatility of the coal price index during the contract period, the volatility of the monthly centralized bidding electricity price in the past three months, and the contract period, the floating clause price of the contract is calculated to be 0.0033 yuan / kW·h.

[0108] (6) The final transaction results are shown in the following table:

[0109]

[0110] (7) If one party breaches the contract, the breaching party shall pay the electricity price floating clause fee of RMB 16.5.

[0111] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0112] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term electricity transactions, characterized in that: The following steps are involved: S1, data collection: collect data on medium- and long-term contracts signed between thermal power companies and coal companies, coal consumption and coal calorific value of power generation units, reasonable proportion of coal cost per kilowatt-hour to total cost per kilowatt-hour, benchmark on-grid electricity price for coal-fired power generation, coal price index, and monthly centralized bidding transaction price data; S2, calculate the benchmark coal price index: calculate the benchmark coal price index corresponding to the benchmark on-grid electricity price of coal-fired power generation according to the power supply coal consumption of the unit and the calorific value of coal; S3, calculation of floating transaction price: calculation of floating transaction price based on the benchmark coal price index, the coal price index at the time of power delivery, the reasonable proportion of coal cost per kWh to the total cost per kWh, and the benchmark on-grid electricity price for coal-fired power generation; S4, calculate the volatility of the coal price index: calculate the volatility of the coal price index from the signing of the contract to the power delivery based on the published coal price index; S5, calculate the volatility of the auction transaction price: calculate the volatility of the monthly centralized auction transaction price for the three consecutive months based on the monthly centralized auction transaction price data; S6, calculate the contract floating clause price: calculate the contract floating clause price based on the floating transaction price, the monthly centralized bidding transaction price volatility, the coal price index volatility during the contract period and the contract term; S7, determine the benchmark transaction price: determine the benchmark transaction price based on the contract signed between the coal enterprise and the coal-fired power plant; S8, calculate the transaction electricity price: calculate the transaction electricity price based on the changes in coal prices and the contract signing between coal enterprises and coal-fired power plants; S9, Settlement and breach of contract handling: Thermal power companies and coal companies settle according to the transaction electricity price. If one party breaches the contract, the breaching party must pay the electricity price floating clause fee.

2. According to claim 1, a method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term electricity transactions, characterized in that: The calculation formula of the benchmark coal price index in S2 is: in, is the benchmark coal price index, is the benchmark on-grid electricity price for coal-fired power generation, a 0 is the calorific value of standard coal, is the calorific value of the corresponding coal, m is the coal consumption of the coal-fired unit, k is ec It is a reasonable proportion of coal costs for power generation enterprises.

3. The method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term power transactions according to claim 2 is characterized in that: The calculation formula of the floating transaction price in S3 is: in, is the floating transaction price, It is the coal price index at the time of electricity delivery.

4. A method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term power transactions according to claim 3, characterized in that: The calculation formula of the coal price index volatility in S4 is: Among them, λ is the volatility of coal price index, σ coal is the standard deviation of the coal price index, is the coal price index for the i-th period, n is the number of periods of coal price index published from the signing of the contract to the power delivery, and D is the number of days from the signing of the contract to the power delivery.

5. According to claim 4, a method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term electricity transactions, characterized in that: The calculation formula of the monthly centralized auction transaction price volatility in S5 is: Among them, γ is the monthly centralized auction transaction price volatility, σ e is the monthly centralized auction transaction price standard deviation, is the monthly centralized bidding transaction price in the jth month.

6. A method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term power transactions according to claim 5, characterized in that: The calculation formula for the contract floating clause price in S6 is: Among them, OP is the floating term price of the contract, e is a natural constant, and Δt is the contract term.

7. A method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term power transactions according to claim 6, characterized in that: Determining the benchmark transaction price in S7 includes: S71, determine the floating terms: define the floating terms of the electricity price signed between thermal power enterprises and coal enterprises, expressed as: S72, determine the price reduction clause: define the price reduction clause signed between coal enterprises and thermal power enterprises, expressed as: S73, No electricity price floating clause: defines the coal enterprise and the thermal power enterprise that have not signed an electricity price floating clause, expressed as: in, The benchmark transaction price.

8. A method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term power transactions according to claim 7, characterized in that: The calculation of the transaction electricity price in S8 includes: S81, Coal price changes and contract floating clauses: When coal prices rise and thermal power companies sign contracts with coal companies to increase electricity prices, or when coal prices fall and thermal power companies sign contracts with coal companies to decrease electricity prices, the formula for calculating the transaction electricity price is: Among them, P e For trading electricity prices; S82, coal price changes but no matching floating clause: When coal price changes and thermal power enterprises and coal enterprises have not signed floating clauses, or coal price rises and contracts are signed with electricity price reduction clauses, or coal price falls and contracts are signed with electricity price increase clauses, the calculation formula for the transaction electricity price is:

9. A method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term power transactions according to claim 8, characterized in that: The calculation formula for the transaction electricity price settlement in S9 is: C e =P e *Q; Among them, C e is the electricity cost of the coal enterprise, and Q is the medium- and long-term contract electricity.

10. A method for linking coal-electricity prices between thermal power companies and coal companies in medium- and long-term power transactions according to claim 9, characterized in that: The calculation formula for the electricity price floating clause fee in S9 is: C OP =OP*Q; Among them, C OP This is the fee for the floating electricity price clause.

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