Thermal power generating unit start-stop peak regulation income analysis system and method

Abstract

The invention relates to the technical field of thermal power generating unit start-stop peak regulation income analysis, and provides a thermal power generating unit start-stop peak regulation income analysis system and method oriented to a spot market. By establishing a thermal power generating unit start-stop peak regulation income analysis system, the start-stop peak regulation income is quantitatively analyzed, and accurate cost and income data are provided. The thermal power generating unit start-stop peak regulation income analysis system comprises analysis of start-stop peak regulation cost and spot system income. Wherein the start-stop peak regulation cost comprises auxiliary machine electricity charge system data acquisition and analysis; collecting and analyzing fire coal data; demineralized water data acquisition and analysis; collecting and analyzing auxiliary steam data; and acquiring and analyzing ultra-low emission data such as desulfurization, denitration and dust removal. And the spot system income is calculated according to a current spot system clearing rule. By accurately accounting whether the start-stop peak regulation income can cover the change cost of the unit or not, a quotation decision is further provided, and effective data guarantee is provided for power marketing of a power plant.

Description

Technical Field

[0001] This invention relates to the field of spot systems for thermal power units, and in particular to a system and method for analyzing the start-up and peak-shaving revenue of thermal power units under spot systems. Background Technology

[0002] With the continuous increase in new energy installed capacity, energy storage and other power generation devices are squeezing the market share of electricity, especially during off-peak hours when the proportion of new energy output is relatively large, further restricting the load space of thermal power units. Given the intermittent and fluctuating nature of new energy output during morning and evening peak hours, to adapt to the new electricity spot market rules, keep abreast of regional electricity market conditions, and leverage the reliability and flexibility of generating units, it is crucial to accurately adjust unit operating status and maximize peak-shaving revenue through reasonable submission of unit start-up and output bids. Therefore, accurate analysis of peak-shaving revenue under the spot market system is essential economic data for decision-making. However, thermal power plants currently lack quantitative analysis support due to increasingly frequent peak-shaving operations. The daily and monthly settlement model of the spot market cannot accurately reflect the daily peak-shaving revenue and cannot determine whether cost expenditures can be covered by compensation. Therefore, this invention aims to establish an analysis system and method for peak-shaving revenue of thermal power units under the spot market system, accurately quantify unit power generation revenue, and provide timely guidance for spot unit start-up and output bids. Summary of the Invention

[0003] This invention provides an analysis system and method for the start-up and peak-shaving revenue of thermal power units in the spot market. Addressing the lack of quantitative analysis support for start-up and peak-shaving revenue under the daily settlement model in the spot market, which hinders timely adaptation to the spot market and provides accurate cost calculation to guide timely spot unit start-up quotations and unit output prices, especially for units at different stages, this invention establishes a start-up and peak-shaving revenue analysis system for thermal power units in the spot market. This system provides accurate cost data for thermal power units, accurately calculates whether start-up and peak-shaving revenue can cover the unit's variable costs, and precisely quantifies the unit's power generation revenue, providing effective data support for power plant electricity marketing.

[0004] The thermal power unit start-up and shutdown peak-shaving revenue analysis system provided by this invention includes data collection and analysis of start-up and shutdown peak-shaving costs and spot market revenue. Start-up and shutdown peak-shaving costs mainly cover: auxiliary equipment power consumption system data collection, used to collect the power consumption of each auxiliary equipment and the current electricity price in the spot market during the start-up and shutdown peak-shaving period for calculating electricity charges; coal data collection, used for coal data during computer unit startup or in spinning standby mode, including the calorific value and quantity of coal fed into the furnace and the current coal price; demineralized water data collection, mainly involving boiler water supply and the amount of water replenished when boiler water quality is substandard; auxiliary steam consumption data collection, including preheating and steam consumption and enthalpy of boiler-side air heaters; and ultra-low emission data such as desulfurization, denitrification, and dust removal, calculated using average statistical costs. Spot market electricity revenue is calculated according to the current spot market clearing rules.

[0005] The calculation of relevant costs involved in the start-up, shutdown, and peak shaving of thermal power units mainly involves the following aspects.

[0006] Calculation method for auxiliary equipment electricity costs: C eq =∑ T t ∑ N i (Q) i，t ×P mkt，i )

[0007] Q i，t The power consumption of each auxiliary machine at different times is measured in kWh, with a 15-minute metering cycle; P mkt，i This refers to the spot market electricity price within the same time period, also measured in 15-minute intervals, with the unit being yuan / kWh. The electricity bill calculation period begins from the moment the unit is ready to start up and continues until it is connected to the grid. When the unit is in spinning standby mode, the calculation period is the time between the moment the unit is disconnected from the grid and the moment it is connected.

[0008] Coal consumption calculation method: The coal consumption (b, in tons) can be measured by the online coal monitoring system; the received lower heating value (Q) of the coal is also measured. net The unit is kJ / kg. The cost of coal, C, can be calculated using the following formula. coal :

[0009] C coal =B×P d =b×Q net / 29271×P d

[0010] Where B represents the amount of standard coal used for power generation, in tons (t); P dThe price is the standard coal unit price, expressed in yuan / ton. If a single type of coal is used during startup or standby, the coal cost can be directly calculated from the coal consumption (b) and the unit price of coal fed into the furnace (P). l The calculation shows that:

[0011] C coal =b×P l

[0012] Desalination cost: C water =m water ×P water

[0013] The demineralized water replenishment volume is m water The water consumption from start-up preparation to grid connection can be calculated using the unit's water makeup metering device, in tons (t). water The price per unit of demineralized water is the average price per unit of water produced, expressed in yuan / ton, and is provided by the water production workshop.

[0014] The cost of auxiliary steam is calculated using the following formula:

[0015] C steam =m steam ×P steam =m steam ×h / (29307×η)×P d

[0016] Where P steam This is the unit price of auxiliary steam, in yuan / t; P d The unit price is the price of standard coal, in yuan / t; h is the specific heat capacity of steam at temperature T℃ and pressure P, in kJ / kg; η is the boiler efficiency. Auxiliary steam consumption (m³ / s) steam (Unit: tons) In the absence of a dedicated auxiliary steam flow meter, the cost can be indirectly calculated by the difference in average makeup water volume between the units providing auxiliary steam and the auxiliary steam. The cost of auxiliary steam can also be calculated using boiler combustion efficiency and the price of standard coal.

[0017] Ultra-low emission processes such as desulfurization, denitrification, and dust removal involve costs such as reagent costs and operating costs. Statistical average costs are used in the calculations.

[0018] C env =Q gen ×(P des +P den +P dus t)=b×Q net / 29271÷m coal ×(P des +P den +P dus t)×1000

[0019] Where Cenv Total cost for ultra-low emissions; Q gen Electricity generation, measured in MWh; P des This is the average statistical price of desulfurization per unit of electricity generated, in yuan / MWh; P den This is the average statistical price of denitrification per unit of electricity generated, in yuan / MWh; P dust This is the average statistical price for dust removal per unit of electricity generated, expressed in yuan / MWh. coal It is the average coal consumption of the unit, and the unit is g / kWh. There is no power generation during the start-up process of the unit, so the power generation can be indirectly calculated from the average coal consumption.

[0020] Therefore, the total cost C during the start-up and shutdown peak shaving process of thermal power units is 总 The calculation is as follows:

[0021] C 总 =C eq +C coal +C water +C steam +C env

[0022] The calculation of spot system revenue includes unit start-up compensation costs and spot system electricity charges. Spot system electricity charges are primarily calculated based on the electricity charge calculation method stipulated in the Gansu Electricity Spot Market Rules.

[0023] R 火电 =R 中长期 +R 日前 +R 实时

[0024] R 中长期 =R 中长期电费 +R 中长期阻塞电费

[0025] Where R 火电 In order to participate in both day-ahead and real-time market electricity revenue, R 中长期 For medium- to long-term contract electricity rates, R 日前 R represents the day-ahead spot electricity cost; 实时 This refers to the real-time spot electricity cost. Therefore, the spot profit formula can be simplified as follows:

[0026] R 火电 =R 中长期电费 +R 中长期塞电费 +R 日前 +R 实时 =

[0027] =R 中长期电费 +R 中长期阻塞电费 + (Q) 日前，t -Q 中长期，t )×P日前，t + (Q) 上网，t -Q 日前，t )×P 上网，t

[0028] Q 日前，t Q represents the day-ahead cleared power of the generating units at time t; 中长期 It refers to the electricity volume under medium- and long-term contracts; P 日前，t Q is the day-ahead market clearing price for start-up and shutdown units at time t; 上网，t P represents the actual on-grid power generation of the unit at time t during startup and shutdown. 实时，t The real-time market clearing price for the start-up and shutdown units at time t.

[0029] R 中长期电费 =Q 中长期，t × P 中长期，t

[0030] R 中长期阻塞电费 =Q 中长期，t ×(P 日前，t - P 中长期结算参考点，t )

[0031] Where P 中长期结算参考点，t It serves as a settlement reference point for medium- and long-term contracts.

[0032] Normal start-up compensation cost for thermal power units R 开机补偿 According to the compensation calculation formula in the Gansu Electricity Spot Market rules:

[0033] R 开机补偿 =P 启动 ×MAX〔0,(72-H 停机 ) / 72〕

[0034] Where P 启动 It refers to the start-up costs declared for the start-up and shutdown units; H 停机 This refers to the duration of a single unit shutdown or continuous shutdown during startup, expressed in hours. The compensation for each incident is calculated based on the unit startup costs declared previously, and shall not exceed the maximum compensation limit for thermal power unit startup costs.

[0035] Therefore, the total electricity cost R during the start-up and shutdown peak shaving process of thermal power units 总 The calculation is as follows:

[0036] R 总 =R 开机补偿 +R 中长期电费 +R 中长期阻塞电费 + (Q) 日前，t -Q 中长期，t )×P 日前，t + (Q) 上网，t -Q 日前，t )×P 上网，t

[0037] The total cost C during the precise calculation of the unit start-up and shutdown process 总 and spot system revenue R 总 By comparing these figures, the revenue gained by the generating unit during start-up and peak shaving can be calculated. This revenue value can then provide more precise guidance for the declaration of start-up costs and spot prices under different unit operating conditions. Attached Figure Description

[0038] Figure 1 A system and method for analyzing the start-up and shutdown peak-shaving revenue of thermal power units. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, the thermal power unit start-up and shutdown peak-shaving revenue analysis system provided by this invention includes data collection and analysis of start-up and shutdown peak-shaving costs and spot market revenue. Start-up and shutdown peak-shaving costs mainly cover: auxiliary equipment power consumption system data collection, used to collect the power consumption of each auxiliary equipment and the current electricity price in the spot market during the start-up and shutdown peak-shaving period, and used to calculate electricity costs; coal data collection, used for coal data during the computer unit startup process or in spinning standby mode, including the calorific value and quantity of coal fed into the furnace and the current coal price; demineralized water data collection, mainly involving boiler water supply and the amount of water replenished when the boiler water quality is substandard; auxiliary steam consumption data collection, including preheating and steam consumption and enthalpy of the boiler-side air heaters; and ultra-low emission data such as desulfurization, denitrification, and dust removal, calculated using average statistical costs. Spot market revenue is calculated according to the current spot market clearing rules.

[0041] The calculation of relevant costs involved in the start-up, shutdown, and peak shaving of thermal power units mainly involves the following aspects.

[0042] Calculation method for auxiliary equipment electricity costs: C eq =∑ T t ∑ N i (Q) i，t ×P mkt，i )

[0043] Q i，t The power consumption of each auxiliary machine at different times is measured in kWh, with a 15-minute metering cycle; P mkt，i This refers to the spot market electricity price within the same time period, also measured in 15-minute intervals, with the unit being yuan / kWh. The electricity bill calculation period begins from the moment the unit is ready to start up and continues until it is connected to the grid. When the unit is in spinning standby mode, the calculation period is the time between the moment the unit is disconnected from the grid and the moment it is connected.

[0044] Coal consumption calculation method: The coal consumption (b, in tons) can be measured by the online coal monitoring system; the received lower heating value (Q) of the coal is also measured. net The unit is kJ / kg. The cost of coal, C, can be calculated using the following formula. coal :

[0045] C coal =B×P d =b×Q net / 29271×P d

[0046] Where B represents the amount of standard coal used for power generation, in tons (t); P d The price is the standard coal unit price, expressed in yuan / ton. If a single type of coal is used during startup or standby, the coal cost can be directly calculated from the coal consumption (b) and the unit price of coal fed into the furnace (P). l The calculation shows that:

[0047] C coal =b×P l

[0048] Desalination cost: C water =m water ×P water

[0049] The demineralized water replenishment volume is m water The water consumption from start-up preparation to grid connection can be calculated using the unit's water makeup metering device, in tons (t). water The price per unit of demineralized water is the average price per unit of water produced, expressed in yuan / ton, and is provided by the water production workshop.

[0050] The cost of auxiliary steam is calculated using the following formula:

[0051] C steam =m steam ×P steam =m steam ×h / (29307×η)×P d

[0052] Where P steam This is the unit price of auxiliary steam, in yuan / t; P d The unit price is the price of standard coal, in yuan / t; h is the specific heat capacity of steam at temperature T℃ and pressure P, in kJ / kg; η is the boiler efficiency. Auxiliary steam consumption (m³ / s) steam (Unit: tons) In the absence of a dedicated auxiliary steam flow meter, the cost can be indirectly calculated by the difference in average makeup water volume between the units providing auxiliary steam and the auxiliary steam. The cost of auxiliary steam can also be calculated using boiler combustion efficiency and the price of standard coal.

[0053] Ultra-low emission processes such as desulfurization, denitrification, and dust removal involve costs such as reagent costs and operating costs. Statistical average costs are used in the calculations.

[0054] C env =Q gen ×(P des +P den +P dus t)=b×Q net / 29271÷m coal ×(P des +P den +P dus t)×1000

[0055] Where C env Total cost for ultra-low emissions; Q gen Electricity generation, measured in MWh; P des This is the average statistical price of desulfurization per unit of electricity generated, in yuan / MWh; P den This is the average statistical price of denitrification per unit of electricity generated, in yuan / MWh; P dust This is the average statistical price for dust removal per unit of electricity generated, expressed in yuan / MWh. coal It is the average coal consumption of the unit, and the unit is g / kWh. There is no power generation during the start-up process of the unit, so the power generation can be indirectly calculated from the average coal consumption.

[0056] Therefore, the total cost C during the start-up and shutdown peak shaving process of thermal power units is 总 The calculation is as follows:

[0057] C 总 =C eq +C coal +C water +C steam +C env

[0058] The calculation of start-up and peak-shaving revenue includes the unit's start-up compensation costs and the spot system electricity price. The spot system electricity price is mainly based on the calculation method of electricity price in the Gansu Electricity Spot Market Rules:

[0059] R 火电 =R 中长期 +R 日前 +R 实时

[0060] R 中长期 =R 中长期电费 +R 中长期阻塞电费

[0061] Where R 火电 In order to participate in both day-ahead and real-time market electricity revenue, R 中长期For medium- to long-term contract electricity rates, R 日前 R represents the day-ahead spot electricity cost; 实时 This refers to the real-time spot electricity cost. Therefore, the spot profit formula can be simplified as follows:

[0062] R 火电 =R 中长期电费 +R 中长期塞电费 +R 日前 +R 实时 =

[0063] =R 中长期电费 +R 中长期阻塞电费 + (Q) 日前，t -Q 中长期，t )×P 日前，t + (Q) 上网，t -Q 日前，t )×P 上网，t

[0064] Q 日前，t Q represents the day-ahead cleared power of the generating units at time t; 中长期 It refers to the electricity volume under medium- and long-term contracts; P 日前，t Q is the day-ahead market clearing price for start-up and shutdown units at time t; 上网，t P represents the actual on-grid power generation of the unit at time t during startup and shutdown. 实时，t The real-time market clearing price for the start-up and shutdown units at time t.

[0065] R 中长期电费 =Q 中长期，t × P 中长期，t

[0066] R 中长期阻塞电费 =Q 中长期，t ×(P 日前，t - P 中长期结算参考点，t )

[0067] Where P 中长期结算参考点，t It serves as a settlement reference point for medium- and long-term contracts.

[0068] Normal start-up compensation cost for thermal power units R 开机补偿 According to the compensation calculation formula in the Gansu Electricity Spot Market rules:

[0069] R 开机补偿 =P 启动 ×MAX〔0,(72-H 停机 ) / 72〕

[0070] Where P 启动 It refers to the start-up costs declared for the start-up and shutdown units; H 停机This refers to the duration of a single unit shutdown or continuous shutdown during startup, expressed in hours. The compensation for each incident is calculated based on the unit startup costs declared previously, and shall not exceed the maximum compensation limit for thermal power unit startup costs.

[0071] Therefore, the total electricity cost R during the start-up and shutdown peak shaving process of thermal power units 总 The calculation is as follows:

[0072] R 总 =R 开机补偿 +R 中长期电费 +R 中长期阻塞电费 + (Q) 日前，t -Q 中长期，t )×P 日前，t + (Q) 上网，t -Q 日前，t )×P 上网，t

[0073] The total cost C during the precise calculation of the unit start-up and shutdown process 总 and spot system revenue R 总 By comparing these figures, the revenue gained by the generating unit during start-up and peak shaving can be calculated. This revenue value can then provide more precise guidance for the declaration of start-up costs and spot prices under different unit operating conditions.

Claims

1. A system and method for analyzing the revenue of a thermal power unit in the spot market, which provides accurate cost data for the thermal power unit and gives precise calculation of whether the revenue of start-stop peak shaving can cover the variable cost of the unit, and provides a thermal power unit start-stop peak shaving revenue analysis system.

2. The system and method for analyzing the revenue of a thermal power unit in the spot market according to claim 1, comprising data collection and analysis of start-stop peak shaving cost and spot system income.

3. The system and method for analyzing the revenue of a thermal power unit in the spot market according to claim 1, wherein the start-stop peak shaving cost mainly covers: auxiliary machine electricity fee system data collection and analysis; coal data collection and analysis; desalted water data collection and analysis; auxiliary steam consumption data collection; desulfurization, denitrification, and dust removal and other ultra-low emission data.

4. The calculation method of auxiliary machine electricity fee according to claim 3. C eq =∑ T t ∑ N i (Q i，t ×P mkt，i ) wherein Q i，t is the power consumption of each auxiliary machine in different time periods, with a 15-minute measurement period and a unit of kWh; P mkt，i is the spot market electricity price in the same period, also with a 15-minute measurement period and a unit of yuan / kWh; the electricity fee calculation node starts from the time when the standby unit is ready to start, and ends when the unit is connected to the grid; when the unit is in a rotating standby state, the calculation period is taken as the time period between the time when the unit is disconnected and the time when the unit is connected to the grid.

5. The calculation method of coal fee according to claim 3. The coal consumption b can be measured by the on-line monitoring system of the coal into the furnace; the received basis low calorific value Q of the coal into the furnace net The coal cost C can be calculated according to the following formula coal : C coal = B x P d = b x Q net / 29271 x P d Where B is the standard coal consumption for power generation, in t; P d is the unit price of standard coal, in yuan / t; if a single coal type is used during the startup process or the rotating standby process, the coal cost can be directly calculated from the coal consumption b and the unit price of the coal fed into the furnace P l The calculation results are as follows: C coal = b x P l。 6. The calculation method of desalted water fee according to claim 3. C water = m water x P water Wherein the amount of desalted water m water The water consumption from the start of the unit preparation to the grid connection of the unit can be obtained by the water supply metering device of the unit, in t; P water The unit price of desalted water is the average unit price of water production, in yuan / t, which is given by the water production workshop.

7. The calculation method of auxiliary steam fee according to claim 3. C steam = m steam × P steam = m steam × h / (29307 x η) x P d P steam is the auxiliary steam unit price, unit: yuan / t; P d is the standard coal unit price, unit: yuan / t; h is the specific heat of steam at T ℃ and P, unit: kJ / kg; η is the boiler efficiency; auxiliary steam gas consumption m steam (unit: t) can be indirectly calculated by providing the average water supply difference of the unit providing auxiliary steam; auxiliary steam cost can also be calculated by boiler combustion efficiency and standard coal unit price.

8. The calculation method of desulfurization, denitrification, and dust removal and other ultra-low emission fees involving reagent cost and operation cost according to claim 3, which uses statistical average cost for calculation. C env = Q gen × (P des + P den + P dus t) = b x Q net / 29271 ÷ m coal × (P des + P den + P dus t) x 1000 wherein C env is the total cost of ultra-low emission; Q gen is the power generation, the unit is MWh; P des is the average statistical price of desulfurization per unit of power generation, the unit is yuan / MWh; P den is the average statistical price of denitration per unit of power generation, the unit is yuan / MWh; P dust is the average statistical price of dust removal per unit of power generation, the unit is yuan / MWh.m coal is the average coal consumption of the unit, the unit is g / kWh. There is no power generation in the process of starting the unit, so the calculation of power generation can be indirectly converted from the average coal consumption.

9. The analysis system and method for the start-up and peak-shaving revenue of thermal power units in the spot market according to claim 1, wherein the total cost C during the start-up and peak-shaving process of thermal power units is... 总 The calculation is as follows: C 总 = C eq + C coal + C water + C steam + C env。 10. The system and method for analyzing the revenue of a thermal power unit in the spot market according to claim 1, wherein the spot system electricity fee is mainly based on the calculation method of electricity energy electricity fee in the Gansu electricity spot market rules: R 火电 = R 中长期 + R 日前 + R 实时 R 中长期 = R 中长期电费 + R 中长期阻塞电费 where R 火电 is the electricity energy and tariff revenue from both day-ahead, real-time market participation, R 中长期 is the medium and long term contract tariff, R 日前 is the day-ahead spot electricity energy and tariff; and R 实时 is the real-time spot electricity energy and tariff.

11. The spot system electricity fee according to claim 10, wherein the spot revenue formula is arranged as: R 火电 = R 中长期电费 + R 中长期塞电费 + R 日前 + R 实时 = = R 中长期电费 + R 中长期阻塞电费 + (Q 日前，t - Q 中长期，t ) x P 日前，t + (Q 上网，t - Q 日前，t ) x P 上网，t wherein Q 日前，t is the day-ahead clearing quantity of the start-stop unit at time t; Q 中长期 is the medium and long-term contract electricity quantity; P 日前，t is the day-ahead market clearing price of the start-stop unit at time t; Q 上网，t is the actual on-grid electricity quantity of the start-stop unit at time t; P 实时，t is the real-time market clearing price of the start-stop unit at time t; R 中长期电费 = Q 中长期，t x P 中长期，t R 中长期阻塞电费 = Q 中长期，t x (P 日前，t - P 中长期结算参考点，t ) where P 中长期结算参考点，t is the settlement reference point for the medium- to long-term contract.

12. The spot system electricity fee according to claim 10, a normal start-up compensation fee R of a thermal power unit 开机补偿 According to the compensation calculation formula in the Gansu electricity spot market rules: R 开机补偿 = P 启动 × MAX [0, (72 - H 停机 ) / 72] Wherein P 启动 is the start-up cost declared by the start-stop unit; H 停机 is the continuous shutdown duration during the one-time shutdown and start-up process of the unit, in hours, and the single compensation cost is calculated according to the start-up cost declared in the day-ahead declaration and does not exceed the upper limit of the start-up cost compensation of the thermal power unit.

13. The analysis system and method for the start-up and peak-shaving revenue of thermal power units in the spot market according to claim 1, wherein the spot system electricity price R during the start-up and peak-shaving process of thermal power units... 总 The calculation is as follows: R 总 = R 开机补偿 + R 中长期电费 + R 中长期阻塞电费 + (Q 日前，t - Q 中长期，t ) x P 日前，t + (Q 上网，t - Q 日前，t ) x P 上网，t。 14. The system and method for analyzing the revenue of a thermal power unit in the spot market according to claim 1, wherein the total cost C in the start-stop process of the unit calculated accurately and the total spot system income R are compared, so as to calculate the revenue obtained by the unit in the start-stop peak shaving process, and the revenue value can be further used to accurately guide the declaration of start-up cost and spot price of the unit in different states.

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