A method, system and device for participating in a flexible market transaction when hydroelectricity is not offered

Abstract

The application discloses a method, system and equipment for participating in a flexible market transaction when water and electricity are not quoted, relates to the electric power technical field, and comprises the following steps: receiving power grid basic data, wherein the power grid basic data comprises unit data, load data, new energy data and net load prediction error data; calculating system flexibility demand according to the net load prediction error data; inputting the system flexibility demand into a pre-established main energy and flexibility ramping market joint clearing model without considering water and electricity participation to obtain a system flexibility ramping shortage; and inputting the system flexibility ramping shortage into the pre-established main energy and flexibility ramping market joint clearing model with water and electricity participation to obtain water and electricity income.

Description

Technical Field

[0001] This invention relates to the field of power technology, specifically to a method, system, and equipment for hydropower companies to participate in flexible market transactions when they do not submit bids. Background Technology

[0002] The increasing proportion of renewable energy connected to the grid places higher demands on the power system's flexible regulation capabilities. Among existing flexible resources, hydropower has the advantages of excellent regulation performance and low regulation costs, making it the best choice for undertaking flexible regulation tasks. Currently, in the trading of flexible ramp-up products, pricing of flexible ramp-up capabilities is based on opportunity costs, lacking research on the trading mechanism of flexible ramp-up markets when hydropower does not participate in electricity spot market bidding and opportunity costs are difficult to calculate. Therefore, it is necessary to establish a joint clearing model for the main energy and flexible ramp-up markets under the condition that hydropower does not bid, and to formulate a reasonable hydropower revenue mechanism to incentivize hydropower to participate in flexible resource dispatch and ensure sufficient flexibility in the system. Summary of the Invention

[0003] To address the shortcomings mentioned in the background section, the present invention aims to provide a method, system, and device for participating in flexible market transactions when hydropower companies do not submit bids.

[0004] The objective of this invention can be achieved through the following technical solution: a method for participating in flexible market transactions when hydropower does not submit a bid, the method comprising the following steps:

[0005] Receive basic power grid data, which includes: generating unit data, load data, renewable energy data, and net load forecast error data;

[0006] The system flexibility requirements are calculated based on the net load forecast error data.

[0007] Without considering the participation of hydropower, the system flexibility demand is input into a pre-established joint clearing model of the main energy and flexibility ramp-up market to obtain the system flexibility ramp-up deficit.

[0008] Taking hydropower into account, the system flexibility ramp-up deficit is input into a pre-established joint clearing model of the main energy and flexibility ramp-up markets to obtain hydropower revenue.

[0009] Preferably, the net load is the remaining load after subtracting the renewable energy generation from the total load, and the net load prediction error consists of the load prediction error and the renewable energy prediction error.

[0010] Preferably, the system flexibility requirements include the requirements for predicting net load fluctuations and uncertainties.

[0011] Preferably, the predicted net load fluctuation is the change in the net load of the system in the next period compared to the current period, and the uncertainty requirement is the additional requirement generated in order to meet the deviation within a certain confidence interval of the system net load prediction.

[0012] Preferably, the main energy and flexibility ramp-up market joint clearing model is as follows:

[0013] minf = C G +C F +C I

[0014] In the formula: C G C represents the total cost of the thermal power unit. F Costs due to insufficient system flexibility; C I This is a penalty item for the operation of hydropower units, and:

[0015]

[0016]

[0017]

[0018] In the formula: a i b i These are the coefficients of the price quotation curve for thermal power unit i; These represent the insufficient ramp-up and ramp-down quantities of thermal power unit i at time t, i.e., the system flexibility deficit. Let π be the start-up / shutdown state variable of hydropower unit k at time t, where 1 represents start-up and 0 represents shutdown; cap The system price ceiling is represented by μ, which is the operating penalty coefficient for hydropower units, set to 10. 7 This ensures a short operating time for the hydropower units; N T N represents the number of time segments in the simulation; G This represents the number of generators.

[0019] Preferably, the main energy and flexibility ramp-up market joint clearing model, without considering hydropower participation, considers the first two terms C of the objective function. G and C F When considering the involvement of hydropower, consider the first and third terms C of the objective function. G and C I .

[0020] Preferably, the constraints of the main energy and flexibility ramp-up market clearing model are as follows:

[0021] a. Power balance constraint:

[0022]

[0023] In the formula: Let i be the power output level of thermal power unit i at time t. Let k be the output level of the hydropower unit at time t. The predicted net load at time t;

[0024] b. Output constraints of thermal power units:

[0025]

[0026] In the formula: P G,i,max P G,i,min These represent the upper and lower limits of the output of thermal power unit i, respectively;

[0027] c. Climbing constraints for thermal power units:

[0028]

[0029] In the formula: R UG,i R DG,i These represent the upward climbing rate and downward sloping rate of thermal power unit i, respectively.

[0030] d. Output constraints of hydropower units:

[0031]

[0032] In the formula: P H,k,max P H,k,min These are the upper and lower limits of the output of hydropower unit k, respectively;

[0033] e. Gradient constraints for hydropower units:

[0034]

[0035] In the formula: R UH,k R DH,k These represent the upward climbing rate and the downward sliding rate of the hydropower unit k, respectively.

[0036] f. Flexibility balance constraints:

[0037]

[0038]

[0039] In the formula: These represent the upward and downward flexibility reserved for thermal power unit i at time t, respectively. These represent the upward and downward flexibility reserved for the hydropower unit k at time t, respectively; FUS t FDS t The upward and downward flexibility requirements of the system at time t are respectively:

[0040]

[0041]

[0042] In the formula: FUU t+1 FDS t+1 These represent the upward and downward uncertainties of the system at time t+1, respectively.

[0043] g. Flexible output constraints of thermal power units:

[0044]

[0045]

[0046]

[0047]

[0048] h. Flexibility and output constraints of hydropower units:

[0049]

[0050]

[0051]

[0052]

[0053] Preferably, the hydropower revenue includes main energy market revenue and flexibility ramp-up market revenue, wherein the main energy market revenue is the difference between the total cost of thermal power when hydropower participation is not considered and when it is considered; the flexibility ramp-up market revenue is the product of the system flexibility ramp-up deficit and the system price ceiling.

[0054] Preferably, a flexible market trading system for hydropower without submitting a bid includes:

[0055] Data acquisition module: used to receive basic power grid data, which includes: generating unit data, load data, renewable energy data, and net load forecast error data;

[0056] Calculation module: used to calculate system flexibility requirements based on net load forecast error data;

[0057] The module for calculating the model without considering hydropower participation is used to input the system flexibility requirements into a pre-established joint clearing model of the main energy and flexibility ramp-up market without considering hydropower participation, and to obtain the system flexibility ramp-up deficit.

[0058] The hydropower participation model calculation module is used to input the system flexibility ramping deficit into a pre-established joint clearing model of the main energy and flexibility ramping markets, under the consideration of hydropower participation, to obtain hydropower revenue.

[0059] Preferably, an apparatus includes:

[0060] One or more processors;

[0061] Memory, used to store one or more programs;

[0062] When one or more of the programs are executed by one or more of the processors, the one or more of the processors implement a flexible market trading method as described above when hydropower is not quoted.

[0063] The beneficial effects of this invention are:

[0064] This invention addresses the flexibility ramping requirements arising from uncertainties under high-proportion renewable energy access, while also considering the special case of hydropower not participating in bidding. It presents a joint clearing model for the main energy and flexibility ramping markets, solved in two steps: one without hydropower and one with hydropower. This model reasonably assesses the contribution of hydropower to providing flexibility ramping capabilities and provides a method for settling hydropower revenue. This invention provides a reference for hydropower resources participating in flexibility ramping product trading, which is conducive to increasing the enthusiasm of hydropower to participate in the flexibility ramping market and improving the safety and economy of system operation. Attached Figure Description

[0065] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 This is a flowchart illustrating the method of the present invention;

[0067] Figure 2 The output result of thermal power units without considering the participation of hydropower;

[0068] Figure 3 The diagram shows the output results of thermal power and hydropower with the participation of hydropower. Detailed Implementation

[0069] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0070] like Figure 1 As shown, a method for hydropower companies to participate in flexible market transactions without submitting a bid includes the following steps:

[0071] Receive basic power grid data, which includes: generating unit data, load data, renewable energy data, and net load forecast error data;

[0072] The net load is the remaining load after subtracting renewable energy generation from the total load, and the net load prediction error consists of the load prediction error and the renewable energy prediction error.

[0073] The system flexibility requirements are calculated based on the net load forecast error data.

[0074] The system flexibility requirements include the need to predict net load fluctuations and uncertainties.

[0075] The predicted net load fluctuation is the change in the net load of the system in the next period compared to the current period. The uncertainty requirement is the additional requirement generated in order to meet the deviation within a certain confidence interval of the system net load prediction.

[0076] Without considering the participation of hydropower, the system flexibility demand is input into a pre-established joint clearing model of the main energy and flexibility ramp-up market to obtain the system flexibility ramp-up deficit.

[0077] Considering hydropower participation, the system flexibility ramp-up deficit is input into a pre-established joint clearing model of the main energy and flexibility ramp-up markets to obtain hydropower revenue. Hydropower revenue includes main energy market revenue and flexibility ramp-up market revenue. Specifically, the main energy market revenue is the difference between the total cost of thermal power when hydropower participation is not considered and when it is considered (it is assumed that hydropower participation reduces the clearing volume of thermal power, thus reducing the total cost of thermal power; therefore, this cost difference is considered hydropower's revenue in the main energy market); the flexibility ramp-up market revenue is the product of the system flexibility ramp-up deficit and the system price ceiling (it is assumed that hydropower participation prevents economic losses caused by insufficient flexibility; therefore, this portion of the system flexibility deficit cost is compensated to hydropower).

[0078] The combined market clearing model based on main energy and flexibility ramp-up is as follows:

[0079] minf = C G +CF +C I

[0080] In the formula: C G C represents the total cost of the thermal power unit. F Costs due to insufficient system flexibility; C I This is a penalty item for the operation of hydropower units, and:

[0081]

[0082]

[0083]

[0084] In the formula: a i b i These are the coefficients of the price quotation curve for thermal power unit i; These represent the insufficient ramp-up and ramp-down quantities of thermal power unit i at time t, i.e., the system flexibility deficit. Let π be the start-up / shutdown state variable of hydropower unit k at time t, where 1 represents start-up and 0 represents shutdown; cap The system price ceiling is represented by μ, which is the operating penalty coefficient for hydropower units, set to 10. 7 This ensures a short operating time for the hydropower units; N T N represents the number of time segments in the simulation; G This represents the number of generators.

[0085] The aforementioned main energy and flexibility ramp-up market joint clearing model, without considering hydropower participation, considers the first two terms C of the objective function. G and C F When considering the involvement of hydropower, consider the first and third terms C of the objective function. G and C I .

[0086] The constraints of the combined main energy and flexibility ramp-up market clearing model are as follows:

[0087] a. Power balance constraint:

[0088]

[0089] In the formula: Let i be the power output level of thermal power unit i at time t. Let k be the output level of the hydropower unit at time t. The predicted net load at time t;

[0090] b. Output constraints of thermal power units:

[0091]

[0092] In the formula: P G,i,max P G,i,min These represent the upper and lower limits of the output of thermal power unit i, respectively;

[0093] c. Climbing constraints for thermal power units:

[0094]

[0095] In the formula: R UG,i R DG,i These represent the upward climbing rate and downward sloping rate of thermal power unit i, respectively.

[0096] d. Output constraints of hydropower units:

[0097]

[0098] In the formula: P H,k,max P H,k,min These are the upper and lower limits of the output of hydropower unit k, respectively;

[0099] e. Gradient constraints for hydropower units:

[0100]

[0101] In the formula: R UH,k R DH,k These represent the upward climbing rate and the downward sliding rate of the hydropower unit k, respectively.

[0102] f. Flexibility balance constraints:

[0103]

[0104]

[0105] In the formula: These represent the upward and downward flexibility reserved for thermal power unit i at time t, respectively. These represent the upward and downward flexibility reserved for the hydropower unit k at time t, respectively; FUS t FDS t The upward and downward flexibility requirements of the system at time t are respectively:

[0106]

[0107]

[0108] In the formula: FUU t+1 FDS t+1 These represent the upward and downward uncertainties of the system at time t+1, respectively.

[0109] g. Flexible output constraints of thermal power units:

[0110]

[0111]

[0112]

[0113]

[0114] h. Flexibility and output constraints of hydropower units:

[0115]

[0116]

[0117]

[0118]

[0119] A flexible market trading system for hydropower projects that do not require bidding includes:

[0120] Data acquisition module: used to receive basic power grid data, which includes: generating unit data, load data, renewable energy data, and net load forecast error data;

[0121] Calculation module: used to calculate system flexibility requirements based on net load forecast error data;

[0122] The module for calculating the model without considering hydropower participation is used to input the system flexibility requirements into a pre-established joint clearing model of the main energy and flexibility ramp-up market without considering hydropower participation, and to obtain the system flexibility ramp-up deficit.

[0123] The hydropower participation model calculation module is used to input the system flexibility ramping deficit into a pre-established joint clearing model of the main energy and flexibility ramping markets, under the consideration of hydropower participation, to obtain hydropower revenue.

[0124] Based on the same inventive concept, this invention also provides a computer device, comprising: one or more processors, and a memory for storing one or more computer programs; the programs include program instructions, and the processor executes the program instructions stored in the memory. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, used to implement one or more instructions, specifically for loading and executing one or more instructions stored in a computer storage medium to implement the above-described method.

[0125] It should be further explained that, based on the same inventive concept, the present invention also provides a computer storage medium storing a computer program, which, when executed by a processor, performs the above-described method. This storage medium can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In the present invention, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0126] The following specific examples will be used to verify this.

[0127] The system comprises three thermal power units and one hydropower unit, with a dispatch cycle of one hour. Unit data is shown in Table 1 (since the hydropower unit is not included in the bidding, its bid is assumed to be 0); net load data is shown in Table 2.

[0128] Table 1 Unit Data

[0129]

[0130] Table 2 Net Load Data

[0131]

[0132] The results of solving the main energy and flexibility ramp-up market joint clearing model established in this invention without considering hydropower participation are shown below. Figure 2 The landslide volume provided by thermal power in the last 5 minutes is shown in Table 3, the total cost of thermal power units is shown in Table 4, and the cost of insufficient system flexibility is shown in Table 5.

[0133] The model was solved considering hydropower participation; the output results for thermal and hydropower are shown below. Figure 3 The hydropower revenue is shown in Table 4. It can be seen that hydropower has played a good regulatory role, making up for the lack of system flexibility, and most of the hydropower revenue comes from the flexibility ramp-up market.

[0134] Table 3 shows the landslide information provided by the thermal power units in the last 5 minutes.

[0135]

[0136] Table 4 Total Cost of Thermal Power Units

[0137]

[0138] Table 5 Costs Due to Insufficient System Flexibility

[0139]

[0140] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0141] The foregoing has shown and described the basic principles, main features, and advantages of this disclosure. Those skilled in the art should understand that this disclosure is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this disclosure. Various changes and modifications can be made to this disclosure without departing from its spirit and scope, and all such changes and modifications fall within the scope of this disclosure as claimed.

Claims

1. A method for hydropower companies to participate in flexible market transactions when they do not submit bids, characterized in that: The method includes the following steps: Receive basic power grid data, which includes: generating unit data, load data, renewable energy data, and net load forecast error data; The system flexibility requirements are calculated based on the net load forecast error data. Without considering the participation of hydropower, the system flexibility demand is input into a pre-established joint clearing model of the main energy and flexibility ramp-up market to obtain the system flexibility ramp-up deficit. Taking hydropower into account, the system flexibility ramp-up deficit is input into a pre-established joint clearing model of the main energy and flexibility ramp-up markets to obtain hydropower revenue.

2. The method for participating in flexible market transactions when hydropower does not submit a bid, as described in claim 1, is characterized in that... The net load is the remaining load after subtracting renewable energy generation from the total load, and the net load prediction error consists of the load prediction error and the renewable energy prediction error.

3. The method for participating in flexible market transactions when hydropower does not submit a bid, as described in claim 1, is characterized in that... The system flexibility requirements include the need to predict net load fluctuations and uncertainties.

4. A method for participating in flexible market transactions when hydropower does not submit a bid, as described in claim 3, characterized in that: The predicted net load fluctuation is the change in the net load of the system in the next period compared to the current period. The uncertainty requirement is the additional requirement generated in order to meet the deviation within a certain confidence interval of the system net load prediction.

5. A method for participating in flexible market transactions when hydropower does not submit a bid, as described in claim 1, characterized in that: The combined market clearing model based on main energy and flexibility ramp-up is as follows: In the formula: This represents the total cost of the thermal power unit. Costs due to insufficient system flexibility; This is a penalty item for the operation of hydropower units, and: In the formula: , thermal power units Price curve coefficient; , thermal power units At any moment The insufficient amount of climbing and landslides indicates a lack of flexibility in the system's climbing ability. For a moment thermal power units The level of output; For hydroelectric generator units At any moment The start / stop status variable, where 1 represents start and 0 represents stop; This is the upper limit of the system price; The penalty factor for hydropower unit operation is set to 10. 7 This ensures that the hydropower units operate for a short period of time; The number of time segments for simulation; This represents the number of generators.

6. A method for participating in flexible market transactions when hydropower does not submit a bid, as described in claim 5, characterized in that: The aforementioned main energy and flexibility ramp-up market joint clearing model, without considering hydropower participation, considers the first two terms of the objective function. and When considering the involvement of hydropower, the first and third terms of the objective function should be taken into account. and .

7. A method for participating in flexible market transactions when hydropower does not submit a bid, as described in claim 6, characterized in that, The constraints of the combined main energy and flexibility ramp-up market clearing model are as follows: a. Power balance constraint: In the formula: For a moment thermal power units The level of output, For a moment Hydropower units The level of output, For a moment The projected net load; b. Output constraints of thermal power units: In the formula: , They represent thermal power units The upper and lower limits of output; c. Climbing constraints for thermal power units: In the formula: , They represent thermal power units Uphill speed, downhill speed; d. Output constraints of hydropower units: In the formula: , Hydropower units The upper and lower limits of output; e. Gradient constraints for hydropower units: In the formula: , These represent hydroelectric power units. Uphill speed, downhill speed; f. Flexibility balance constraints: In the formula: , They are time points thermal power units The flexibility reserved for upward and downward movement; , They are time points Hydropower units The flexibility reserved for upward and downward movement; , They are time points The system's need for upward and downward flexibility: In the formula: , They are respectively The uncertainty of the system's upward and downward movements at any given moment; g. Flexible output constraints of thermal power units: h. Flexibility and output constraints of hydropower units: 。 8. A method for participating in flexible market transactions when hydropower does not submit a bid, as described in claim 1, characterized in that: The hydropower revenue includes revenue from the main energy market and revenue from the flexibility ramp-up market. The revenue from the main energy market is the difference between the total cost of thermal power when hydropower is not considered and when hydropower is considered. The revenue from the flexibility ramp-up market is the product of the system flexibility ramp-up deficit and the system price ceiling.

9. A flexible market trading system for hydropower projects that do not require bidding, characterized in that: include: Data acquisition module: used to receive basic power grid data, which includes: generating unit data, load data, renewable energy data, and net load forecast error data; Calculation module: used to calculate system flexibility requirements based on net load forecast error data; The module for calculating the model without considering hydropower participation is used to input the system flexibility requirements into a pre-established joint clearing model of the main energy and flexibility ramp-up market without considering hydropower participation, and to obtain the system flexibility ramp-up deficit. The hydropower participation model calculation module is used to input the system flexibility ramping deficit into a pre-established joint clearing model of the main energy and flexibility ramping markets, under the consideration of hydropower participation, to obtain hydropower revenue.

10. A device for participating in flexible market transactions when hydropower does not submit a bid, characterized in that, include: One or more processors; Memory, used to store one or more programs; When one or more of the programs are executed by one or more of the processors, the one or more processors implement a method for participating in flexible market transactions when hydropower is not quoted, as described in any one of claims 1-8.

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