A method for optimizing the operation of natural gas and water resources coordinated power generation

Abstract

The present invention discloses a method for optimizing the operation of coordinated power generation of natural gas and water resources, including establishing an additional gas-electricity sharing mechanism; using the sharing mechanism to include the sharing cost in the total cost of gas-water bundled transmission, and constructing a gas-water bundled transmission cost model; determining the unit price of gas-electricity-hydroelectricity bundled transmission based on the receiving-end power game, and establishing a gas-water bundled transmission revenue model; establishing a total cost and revenue model for coordinated power generation of gas and water in combination with the gas-water bundled transmission cost model and the gas-water bundled transmission revenue model; and optimizing power generation based on the total cost and revenue model for coordinated power generation of gas and water. The gas-water bundled transmission method is adopted to coordinate with hydropower to reduce carbon emissions from power generation, improve the seasonal imbalance problem of more abundant and less scarce hydropower, improve the system peak-shaving capacity and clean energy absorption rate, and realize multi-energy coordinated optimization operation.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and more particularly to a method for optimizing the operation of coordinated power generation of natural gas and water resources. Background Art

[0002] There are many ways to solve the dilemma of water abandonment through coordinated power generation of multiple energy sources. Currently, most research uses wind power, photovoltaic power or thermal power, nuclear power, energy storage devices, etc. to coordinate power generation with hydropower. Although they can reduce the amount of water abandonment to a certain extent, the randomness and volatility of wind power and photovoltaic power will have a great impact on the stability of the power system. Nuclear power and energy storage are difficult to promote due to scale limitations. Thermal power causes great pollution to the environment, and coordinating hydropower in the medium and long term cannot form an advantage.

[0003] From the current development status at home and abroad, a wind-solar-water-gas-fire-storage joint optimization model and method based on opportunity-constrained target programming has been proposed to improve the absorption rate of wind, solar and other energy sources, but it will sacrifice the interests of some hydropower stations. An optimization model for complementary power generation of multiple clean energy sources including wind, water and gas has been constructed, but it ignores the problem of excessive wind power in winter leading to wind turbine removal and insufficient hydropower causing power shortage. These studies only regard hydropower as one of the participants in the coordinated optimization of three or more energy sources. The introduction of wind power and photovoltaic balanced output is often accompanied by problems such as wind abandonment and solar abandonment.

[0004] Natural gas resources are abundant, and gas-fired units have low carbon emissions and excellent peak-shaving performance, which can be used as a powerful way to coordinate hydropower operations. Although the use of natural gas power generation to coordinate hydropower can promote natural gas consumption and improve system stability, if only internal coordinated power generation is considered, it will fall into a development deadlock due to the high cost of gas-fired power operation and maintenance, and there is currently no reasonable model for gas-water coordinated power generation to deal with this problem.

[0005] Therefore, how to provide a method for optimizing the operation of natural gas and water resources coordinated power generation to solve the above drawbacks is an urgent problem that needs to be solved by those skilled in the art. Summary of the invention

[0006] In view of this, the present invention provides a method for optimizing the operation of coordinated power generation of natural gas and water resources, which utilizes the characteristics of low carbon emissions and fast peak-shaving speed in natural gas power generation to replace thermal power for natural gas power generation, and adopts a gas-water bundled delivery method to coordinate scheduling with hydropower, reduce carbon emissions from power generation, improve the seasonal imbalance problem of more hydropower in abundance and less drought, improve the system peak-shaving capacity and clean energy consumption rate, and realize multi-energy coordinated optimization operation.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A method for optimizing the operation of natural gas and water resource coordinated power generation, comprising:

[0009] Establish a mechanism for sharing the additional gas and electricity;

[0010] The apportionment mechanism is used to include the apportionment cost into the total cost of gas and water bundling and delivery, and a gas and water bundling and delivery cost model is constructed;

[0011] Determine the unit price of gas-electricity-hydropower bundled transmission based on the receiving-end power game, and establish a gas-electricity-hydropower bundled transmission revenue model;

[0012] Combine the gas-water bundled transmission cost model and the gas-water bundled transmission revenue model to establish the total cost and revenue model of gas-water coordinated power generation;

[0013] Power generation optimization is carried out based on the total cost and benefit model of gas-water coordinated power generation.

[0014] Preferably, the establishment of an additional gas and electricity sharing mechanism includes:

[0015] Gas-fired power participates in the smooth output process and increases the amount of transmission, which is allocated to the power grid, hydropower and gas-fired power. It is set that gas-fired power is increased during the dry season and not increased during the flood season. The penalty factor is introduced to calculate the additional cost. When there is an increase in the dispatch period, the variable δ t When the variable δ is 1, there is no additional issuance. t Take 0.

[0016] Preferably, the calculation formula of the gas-water bundling and delivery cost model is:

[0017]

[0018] in, The total cost of bundling gas and water for delivery, is the amount of hydropower delivered during period t, is the natural gas power generation delivered during period t, C h is the average cost per kilowatt-hour of hydroelectric power generation, C g is the average cost of natural gas power generation, μ is the penalty factor, δ t It is a 0-1 variable, which is 1 when there is additional gas and electricity, and 0 when there is no additional gas and electricity. The amount of gas and electricity sent out during period t.

[0019] Preferably, the calculation formula of the gas-water bundling and delivery revenue model is:

[0020]

[0021] in, is the total revenue of gas and water bundle delivery during period t, C deli The unit price for bundled delivery of gas, electricity, water and electricity.

[0022] Preferably, the average cost per kWh of natural gas power generation will be calculated by combining fixed costs, carbon emission costs of gas-fired power generation, operation and maintenance costs, depreciation costs, and startup costs. The formula is as follows:

[0023]

[0024] C fix =C ope +C dep +C sta

[0025] In the formula, C fix is the annual fixed cost of natural gas power generation, T y is the annual average utilization hours, μ g is the gas consumption per kWh of natural gas power generation, C pur is the purchase price of natural gas, C emi is the carbon emission per kWh of natural gas power generation, C a is the unit carbon emission cost, C ope is the gas unit operation and maintenance cost, C dep is the depreciation cost of the gas unit, C sta The starting cost per kilowatt-hour.

[0026] Preferably, establishing a total cost and benefit model for gas-water coordinated power generation specifically includes:

[0027] The cost of gas-water bundled transmission is incorporated into the cost of gas-water coordinated power generation, and the revenue from gas-water bundled transmission is incorporated into the revenue from gas-water coordinated power generation;

[0028] Taking gas power as base load and peak load, and hydropower as mid-load, a total cost and benefit model of gas-water coordinated power generation is established, where the total cost objective function of gas-water coordinated power generation is:

[0029]

[0030] In the formula, is the total cost of gas-water coordinated power generation, W t,h is the total power generation of the hydropower unit in the T period, W t,g is the total power generation of the gas-fired generator set during the T period, C h is the average cost per kilowatt-hour of hydroelectric power generation, C g is the average cost of natural gas power generation, μ is the penalty factor, δ t It is a 0-1 variable, which is 1 when there is additional gas and electricity, and 0 when there is no additional gas and electricity. Increase the amount of gas and electricity for external transmission during the T period;

[0031] The total revenue objective function of gas-water coordinated power generation and bundled transmission is:

[0032]

[0033] In the formula, The total revenue of gas-water coordinated power generation and bundled transmission, including the revenue of gas-water coordinated power generation and the revenue of gas-water bundled transmission, The hydropower generation participating in the power balance at the sending end; The gas-fired power generation participating in the power balance at the sending end; For hydropower on-grid electricity prices, is the on-grid electricity price of gas-fired power, C deli The unit price for bundling gas, electricity, and water for delivery;

[0034] Set constraints, including:

[0035] Electricity balance constraint: The power generation of gas and hydropower meets the load demand and the demand for external power transmission, as shown in the following formula:

[0036]

[0037] Where W t,l is the system load during this period;

[0038] Unit power generation constraint: The power generation of hydropower stations and gas power stations must be less than the product of their respective installed capacity, maximum utilization hours and maximum efficiency, as shown in the following formula:

[0039]

[0040] Where: P t,h , P t,g Respectively represent the total installed capacity of hydropower units and gas-fired units during the period; T t,h,max 、T t,g,max are the maximum utilization hours of the hydropower unit and the gas-fired unit during this period; η h,max , η g,max They are the maximum utilization efficiency of hydropower units and gas-fired units respectively.

[0041] Delivery channel capacity constraint: The bundled delivery volume does not exceed the delivery channel cross-sectional capacity limit, as shown in the following formula:

[0042]

[0043] In the formula, It is the maximum transmission power limit allowed on the transmission section within the dispatching period; The maximum number of delivery hours.

[0044] The present invention has the following advantages:

[0045] (1) Replacing thermal power with gas-fired power and coordinating and optimizing its operation with hydropower solves the problem of high carbon emissions from thermal power.

[0046] (2) Different from the traditional multi-energy coordinated optimization operation method, the present invention not only uses natural gas for power generation to reduce carbon emissions, but also includes the cost and revenue of gas-water bundling and transmission into the total cost and total revenue of gas-water coordinated power generation, thus avoiding the situation where the cost of gas-fired power generation is too high and leads to low profits, which is of promotion value for medium- and long-term operation.

[0047] (3) In the process of coordination and optimization, it is proposed that the operation mode of using floating electricity prices for hydropower and low-carbon cost electricity prices for gas-fired power generation can make the power generation revenue more stable during the wet and dry seasons.

[0048] (4) The use of gas-water bundled transmission can avoid differentiating the on-grid electricity prices between the wet and dry seasons of hydropower, thereby giving full play to the advantages of bundled power resources for coordinated operation.

[0049] (5) By generating less gas-fired power during the flood season and more during the dry season, the power output of the two seasons can be balanced, the load shortfall can be reduced, and the system stability can be improved.

[0050] (6) The gas-water bundled transmission model can gain bargaining advantage at the receiving end, give priority to the use of bundled electricity, thereby reducing the amount of thermal electricity at the receiving end, improving the utilization rate of AC and DC transmission lines and the cross-regional power grid coordination capabilities, and thus promoting the consumption of clean energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0052] Figure 1 The accompanying drawing is a flow chart of a method for optimizing operation of coordinated power generation of natural gas and water resources provided by the present invention.

[0053] Figure 2 The attached figure is a schematic diagram of the gas and water bundling delivery solution.

[0054] Figure 3 The attached figure is a simplified diagram of AC and DC power transmission.

[0055] Figure 4 The attached figure shows the cost and benefits of power transmission from Sichuan and Chongqing.

[0056] Figure 5 The attached figure is a monthly power generation chart of gas-water coordinated optimization.

[0057] Figure 6 The attached figure is a profit chart for gas-water coordination optimization. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The embodiment of the present invention discloses a method for optimizing the operation of natural gas and water resources coordinated power generation. Figure 1 As shown, including:

[0060] (1) Establish an allocation mechanism for additional gas-fired power generation; gas-fired power participating in the smoothing process will increase the amount of power delivered, which will be allocated to the power grid, hydropower, and gas-fired power. Set the increase in gas-fired power generation during the dry season and no increase in power generation during the flood season. The allocation model is as follows: Figure 2 As shown, the additional issuance cost is calculated by introducing a penalty factor, which takes 1 when there is an additional issuance during the scheduling period and takes 0 when there is no additional issuance.

[0061] (2) Adopting “gas and water bundled delivery” to replace the original direct delivery of hydropower, and constructing a “gas and water bundled delivery” model, specifically:

[0062] ① Cost model for bundled gas and hydro transmission: Using the allocation mechanism established in (1), taking into account the cost of additional gas-fired power generation, and considering different generation costs for gas-fired power and hydro-power, the cost of transmission can take into account peak load and extreme load conditions. The formula is as follows:

[0063]

[0064] in, The total cost of bundling gas and water for delivery, is the amount of hydropower delivered during period t, is the natural gas power generation delivered during period t, C h is the average cost per kilowatt-hour of hydroelectric power generation, C g is the average cost of natural gas power generation, μ is the penalty factor, δ t It is a 0-1 variable, which is 1 when there is additional gas and electricity, and 0 when there is no additional gas and electricity. Increase the amount of gas and electricity delivered during the T period.

[0065] ②Gas-water bundled transmission revenue model: Using AC and DC transmission channels, in order to gain the power bargaining advantage at the receiving end, the bundled power grid price adopts a unified pricing model. The gas-water bundled transmission revenue formula is:

[0066]

[0067] in, is the total revenue of gas and water bundle delivery during period T, C deliThe unit price for bundled delivery of gas, electricity, water and electricity.

[0068] (3) Determine the average cost per kWh of natural gas power generation: convert fixed costs, carbon emission costs of gas-fired power generation, operation and maintenance costs, depreciation costs, and startup costs into the unit price of natural gas power generation. The reduction of carbon emission costs is an important factor in reducing the cost of gas-fired power generation. The formula for the average cost per kWh of gas-fired power generation is as follows:

[0069]

[0070] C fix =C ope +C dep +C sta

[0071] In the formula, C fix is the annual fixed cost of natural gas power generation, T y is the annual average utilization hours, μ g is the gas consumption per kWh of natural gas power generation, C pur is the purchase price of natural gas, C emi is the carbon emission per kWh of natural gas power generation, C a is the unit carbon emission cost, C ope is the gas unit operation and maintenance cost, C dep is the depreciation cost of the gas unit, C sta The starting cost per kilowatt-hour.

[0072] (4) The cost of gas-water bundled transmission is incorporated into the cost of gas-water coordinated power generation, and the revenue from gas-water bundled transmission is incorporated into the revenue from gas-water coordinated power generation;

[0073] Taking gas power as base load and peak load, and hydropower as mid-load, a total cost and benefit model of gas-water coordinated power generation is established, where the total cost objective function of gas-water coordinated power generation is:

[0074]

[0075] In the formula, is the total cost of power generation, W t,h is the total power generation of the hydropower unit in period t, W t,g is the total power generation of the gas-fired generator set during period t, C h is the average cost per kilowatt-hour of hydroelectric power generation, C g The average cost of electricity generated by natural gas;

[0076] The total revenue objective function of gas-water coordinated power generation and bundled transmission is:

[0077]

[0078] In the formula, For the total revenue of gas and water coordinated power generation and bundled delivery, The hydropower generation participating in the power balance at the sending end; The gas-fired power generation participating in the power balance at the sending end; For hydropower on-grid electricity prices, is the on-grid electricity price of gas-fired power, C deli The unit price for bundling gas, electricity, and water for delivery;

[0079] Set constraints, including:

[0080] Electricity balance constraint: The electricity delivered should be considered as part of the total power generation, so the power generation of gas and hydropower should meet the load demand and the demand for electricity delivered, as shown in the following formula:

[0081]

[0082] Where W t,l is the system load during this period; through this constraint condition, and The constraints on W t,h and W t,g constraints.

[0083] Unit power generation constraint: The power generation of hydropower stations and gas power stations must be less than the product of their respective installed capacity, maximum utilization hours and maximum efficiency, as shown in the following formula:

[0084]

[0085] Where: P t,h , P t,g Respectively represent the total installed capacity of hydropower units and gas-fired units during the period; T t,h,max , T t,g,max are the maximum utilization hours of the hydropower unit and the gas-fired unit during this period; η h,max , η g,max They are the maximum utilization efficiency of hydropower units and gas-fired units respectively.

[0086] Delivery channel capacity constraint: The bundled delivery volume does not exceed the delivery channel cross-sectional capacity limit, as shown in the following formula:

[0087]

[0088] In the formula, It is the maximum transmission power limit allowed on the transmission section within the dispatching period; The maximum number of delivery hours.

[0089] (5) Power generation optimization based on the total cost and benefit model of gas-water coordinated power generation: The linear weighted method is used to convert the multi-objective into a single-objective model, and a judgment matrix is ​​constructed. The conditions are set: the importance of the total cost objective function of gas-water coordinated power generation relative to the total benefit objective function of gas-water coordinated power generation and bundled transmission is 3. The Lagrange multiplier method is used to determine that the weight coefficients of coordinated power generation cost and benefit are 0.674 and 0.326 respectively. The optimization results can be obtained by bringing the model constraints and weight coefficients into the solution program.

[0090] In conjunction with the examples, the specific steps of the present invention are as follows:

[0091] The operation cycle is 12 months a year, and optimization and adjustment are carried out every month.

[0092] (1) The monthly hydropower transmission volume in Sichuan and Chongqing in 2019 was selected for analysis. The specific transmission volume data are shown in the following table.

[0093] Table 1 Hydropower transmission volume of Sichuan and Chongqing in 2019

[0094]

[0095] (2) Based on the on-grid electricity price of thermal power in East China, in order to gain a competitive advantage in electricity prices, the on-grid unit price of gas-water bundled transmission is determined to be 0.4012 yuan / kWh, the on-grid unit price of thermal power in Sichuan Province in 2019. A gas-water bundled transmission plan is established after accounting for the shared costs, such as Figure 2 shown.

[0096] (3) The constructed gas-water coordinated power generation optimization model and the unit price per kilowatt-hour involve the purchase price, power consumption per kilowatt-hour, fixed cost, annual utilization hours, carbon emission cost, and carbon emission per kilowatt-hour as shown in the following table:

[0097] Table 2 Main economic parameters of power generation

[0098]

[0099] (4) Taking the total amount of electricity transmitted in Sichuan and Chongqing in 2019 as the total amount of hydropower transmission, gas-fired power and hydropower are bundled, and the total amount of electricity transmitted each month is maintained at 195 kWh. The calculation parameters of the unit price of gas-fired power generation are shown in Table 2. The unit price of hydropower generation is 0.1 yuan / kWh. The monthly transmission cost and income are obtained as follows: Figure 4 shown.

[0100] (5) Based on the power generation, annual utilization hours, gas-to-grid price and power generation efficiency of Sichuan Chuantou Gas Power Plant and Chongqing Huaneng Liangjiang Gas Power Plant, the following table shows.

[0101] Table 3 Main information of natural gas power generation in Sichuan and Chongqing

[0102]

[0103] (6) The linear weighted method is used to bring the total social electricity consumption, transmission channel capacity, main economic parameters and gas-fired power grid price of Sichuan and Chongqing in 2019 into the solution program based on the optimization model, and the monthly hydropower and gas-fired power generation, hydropower transmission and gas-fired power transmission in 2019 are obtained, as follows: Figure 5 shown.

[0104] (7) By Figure 5 The power generation data obtained are used to obtain the corresponding power generation profits, such as Figure 6 As shown. The results show that among the total profits obtained by the coordinated optimization model taking into account gas-water bundled transmission, bundled transmission has the highest profit, followed by hydropower, and gas-fired power has a relatively low profit share. Gas is used to store water during the dry season, and water is used to store gas during the wet season. The output of gas-fired power and hydropower during the wet and dry seasons is basically complementary, and the average utilization rate of the transmission channel reaches 95%. It can improve the stability of the power system and the utilization rate of the transmission channel, and gas-water coordinated power generation can also obtain greater profits.

[0105] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0106] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for optimizing the operation of natural gas and water resources coordinated power generation, characterized in that: include: Establish a mechanism for sharing the additional gas and electricity; The apportionment mechanism is used to include the apportionment cost into the total cost of gas and water bundling and delivery, and a gas and water bundling and delivery cost model is constructed; Determine the unit price of gas-electricity-hydropower bundled transmission based on the receiving-end power game, and establish a gas-electricity-hydropower bundled transmission revenue model; Combine the gas-water bundled transmission cost model and the gas-water bundled transmission revenue model to establish the total cost and revenue model of gas-water coordinated power generation; Power generation optimization based on the total cost and benefit model of gas-water coordinated power generation; The calculation formula of the gas and water bundling delivery cost model is: in, The total cost of bundling gas and water for delivery, is the amount of hydropower delivered during period t, is the natural gas power generation delivered during period t, C h is the average cost per kWh of hydroelectric power generation, C g is the average cost of natural gas power generation, μ is the penalty factor, δ t It is a 0-1 variable, which is 1 when there is additional gas and electricity, and 0 when there is no additional gas and electricity. Increase the amount of gas and electricity for external transmission during the T period; The calculation formula of the revenue model of gas and water bundling delivery is: in, is the total revenue of gas and water bundle delivery during period t, C deli Bundled delivery price for gas, electricity, water and electricity The total cost and benefit model of gas-water coordinated power generation is established, including: The cost of gas-water bundled transmission is incorporated into the cost of gas-water coordinated power generation, and the revenue from gas-water bundled transmission is incorporated into the revenue from gas-water coordinated power generation; Taking gas power as base load and peak load, and hydropower as mid-load, a total cost and benefit model of gas-water coordinated power generation is established, where the total cost objective function of gas-water coordinated power generation is: In the formula, is the total cost of gas-water coordinated power generation, W t,h is the total power generation of the hydropower unit in the T period, W t,g is the total power generation of the gas-fired generator set during the T period, C h is the average cost per kWh of hydroelectric power generation, C g is the average cost of natural gas power generation, μ is the penalty factor, δ t It is a 0-1 variable, which is 1 when there is additional gas and electricity, and 0 when there is no additional gas and electricity. Increase the amount of gas and electricity for external transmission during the T period; The total revenue objective function of gas-water coordinated power generation and bundled transmission is: In the formula, The total revenue of gas-water coordinated power generation and bundled transmission, including the revenue of gas-water coordinated power generation and the revenue of gas-water bundled transmission, The hydropower generation participating in the power balance at the sending end; The gas-fired power generation participating in the power balance at the sending end; For hydropower on-grid electricity prices, is the on-grid electricity price of gas-fired power, C deli The unit price for bundled delivery of gas, electricity, water and electricity.

2. A method for optimizing the operation of natural gas and water resources coordinated power generation according to claim 1, characterized in that: The establishment of a mechanism for allocating additional gas and electricity production includes: Gas-fired power participates in the smooth output process and increases the amount of transmission. The additional cost generated by the additional transmission is allocated to the power grid, hydropower and gas-fired power. It is set that gas-fired power is increased during the dry season and not increased during the flood season. The penalty factor is introduced to calculate the additional cost. The shared gas-fired power cost and the shared hydropower cost are normalized. When there is an increase in the dispatch period, the variable δ t When the variable δ is 1, there is no additional issuance. t Take 0.

3. A method for optimizing the operation of natural gas and water resources coordinated power generation according to claim 1, characterized in that: The average cost per kWh of natural gas power generation will be calculated by combining fixed costs, carbon emission costs of gas power generation, operation and maintenance costs, depreciation costs, and startup costs. The formula is as follows: C fix =C ope +C dep +C sta In the formula, C fix is the annual fixed cost of natural gas power generation, T y is the annual average utilization hours, μ g is the gas consumption per kWh of natural gas power generation, C pur is the purchase price of natural gas, C emi is the carbon emission per kWh of natural gas power generation, C a is the unit carbon emission cost, C ope is the gas unit operation and maintenance cost, C dep is the depreciation cost of the gas unit, C sta The starting cost per kilowatt-hour.

4. A method for optimizing the operation of natural gas and water resources coordinated power generation according to claim 3, characterized in that: Set constraints, including: Electricity balance constraint: The power generation of gas and hydropower meets the load demand and the demand for external power transmission, as shown in the following formula: Where W t，l is the system load during this period; Unit power generation constraint: The power generation of hydropower stations and gas power stations must be less than the product of their respective installed capacity, maximum utilization hours and maximum efficiency, as shown in the following formula: Where: P t,h , P t,g Respectively represent the total installed capacity of hydropower units and gas-fired units during the period; T t,h,max , T t,g,max are the maximum utilization hours of the hydropower unit and the gas-fired unit during this period; η h,max , η g,max They are the maximum utilization efficiency of hydropower units and gas-fired units respectively; Delivery channel capacity constraint: The bundled delivery volume does not exceed the delivery channel cross-sectional capacity limit, as shown in the following formula: In the formula, It is the maximum transmission power limit allowed on the transmission section within the dispatching period; The maximum number of delivery hours.

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