A method, medium and system for hydropower adjustment in a power market environment

Abstract

The application discloses a hydropower adjustment method, medium and system in a power market environment, and the method comprises the following steps: dividing the direct-regulation hydropower into three categories, namely, a regulation power plant, a secondary regulation power plant and a non-regulation power plant; adopting different hydropower adjustment methods according to different power plants, specifically, if there is an out-of-limit section in the result of the clearing, and increasing the output of a certain hydropower station can alleviate the congestion, then the regulation power plant sequentially increases the hydropower output, the secondary regulation power plant participates in the adjustment according to a selection mode, and the non-regulation power plant participates in the adjustment according to the output change of the specified regulation power plant. The application has the advantages of guaranteeing the rationality and reliability of the hydropower station power generation plan, alleviating the overload of the section line power flow, and improving the network security of the power system.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of hydropower regulation, and in particular to a hydropower regulation method, medium and system in an electric power market environment. Background Art

[0002] Currently, the development of electricity spot markets in some provinces faces numerous challenges, including tight power balances, significant market concentration, a large proportion of non-marketized units, and a large number of sections. Against the backdrop of rapidly growing installed capacity from renewable energy sources, the uncertainty of their generation further complicates the development of spot markets, leading to a high risk of abnormal clearing after market operation. This situation places higher demands on grid security verification and post-clearance correction. To improve grid operation control and alleviate grid congestion in a market environment, post-clearance correction requires addressing and intervening in over-limit situations on relevant lines and sections, and assessing the impact of grid security constraints on system operation and power trading. Therefore, after the safety verification and price calculation modules are complete, output can be adjusted using closed-loop correction or manual correction methods in the safety correction phase to reduce over-limit situations, alleviate congestion, and maintain safe and stable grid operation. As non-marketized units participate in the correction phase, hydropower generation must carefully consider factors such as their physical characteristics, operating parameters, and upstream and downstream coupling when adjusting output. Furthermore, ensuring competitive fairness requires developing optimized control strategies for hydropower plants. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the present invention provides a hydropower adjustment method, medium and system in an electric power market environment that ensures the rationality and reliability of the hydropower station's power generation plan, alleviates the overload of the section line flow, and improves the network security of the power system.

[0004] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0005] A hydropower adjustment method in an electricity market environment, comprising:

[0006] Directly regulated hydropower is divided into three categories: regulating power plants, sub-regulating power plants and non-regulating power plants;

[0007] Different hydropower adjustment methods are adopted according to different power plants. Specifically: if there is an over-limit section in the clearing result, and increasing the output of a certain hydropower station can alleviate the congestion, the regulating power plants will increase the hydropower output in sequence, the secondary regulating power plants will participate in the adjustment according to the selection mode, and the non-regulating power plants will participate in the adjustment according to the output changes of the designated regulating power plants.

[0008] Preferably, the process of adjusting the power plants to increase hydropower output sequentially is:

[0009] When increasing output, the priority order of increasing output, the preset percentage of rated power for increasing output, and the preset percentage of rated power for decreasing output of the power plants are adjusted. After the power plants are increased to the corresponding percentage of the preset percentage of rated power for increasing output, the output of the subsequent power plants is increased. If all power plants have increased their output to the preset rated power and output still needs to be adjusted, the output of the power plants will be increased to the rated power from the beginning in sequence.

[0010] Preferably, the two-stage sequencing adjustment formula for adjusting the power plant is:

[0011]

[0012] in, and Representing hydropower plants k The percentage of the preset rated power for reducing or increasing output; For hydropower plants k Rated power capacity; This is the planned electricity volume obtained by optimizing the clearing of the unit. A single period is 15 minutes. When calculating electricity volume, the unified unit is MWh. The change in electricity volume after adding or subtracting power is obtained by dividing the total output by 4.

[0013]

[0014] In the secondary regulation, the corresponding electricity volume after the power plant reduces its output should not be lower than the minimum ecological electricity volume of the power plant.

[0015] Preferably, the process of the secondary regulating power plant participating in the adjustment according to the selection mode is:

[0016] Two modes can be set: sorting adjustment and upstream power generation adjustment. When sorting adjustment is selected, the same as the power plant adjustment method is used. In addition to the preset rated power percentage value and minimum ecological power, the initial maximum power is also given. The actual maximum power is calculated according to the following formula: actual maximum power = initial maximum power + upstream power plant power * coefficient. When increasing output, the total power does not exceed the actual maximum power.

[0017] When the upstream power generation regulation mode is selected, the power of the current regulating power plant is adjusted synchronously with the upstream regulating power plant according to the power ratio given by the water source.

[0018] Preferably, the secondary regulating power plant adopts a two-stage sequencing regulation mode:

[0019]

[0020] and Representing hydropower plants k The percentage of the preset rated power for reducing or increasing output; For hydropower plants k Rated power capacity; Planned electricity volume obtained through unit clearing optimization; Indicates power plant j k The initial maximum charge, for j k Upstream power plant up(j k ) of electricity, For power plants k The power adjustment coefficient; when the units under the secondary regulation power plant increase their output, the power plant power should not be higher than the actual maximum power.

[0021] Preferably, the formula for the upstream power generation regulation mode selected by the secondary regulation power plant is:

[0022]

[0023] Secondary regulating power plant k The power deviation after adjusting the output must be equal to that of the upstream power plant up(jk) The output adjustment corresponds to the power deviation, The adjustment ratio determined by the Water Conservancy Department.

[0024] Preferably, the formula for the non-regulated power plant to participate in the adjustment according to the output change of the designated regulated power plant is:

[0025]

[0026] Preferably, the objective function of the hydropower adjustment method is:

[0027]

[0028] Among them, C i,t (P i,t ) is the operating cost of the unit, is the startup cost of the unit, M1 is the penalty factor of network security constraint, are the positive and negative slack variables of the section constraint, M H is the penalty factor for abandoned hydropower, is the amount of abandoned hydropower by hydropower plant i at time t; Ω1 is an ordered set of all regulating power plants, and the hydropower plant at the kth adjustment order is: j k ∈Ω1={j1...j k ...j n}, Ω2 is an ordered set containing all secondary regulating power plants; They are the output-increasing variables of the primary and secondary sequencing regulation of the units in the hydropower plant; are the output reduction variables of the first-level and second-level sequencing regulation of the hydropower plant respectively; For hydropower plants kThe penalty factor for the first and second level sorting adjustment.

[0029] The present invention also discloses a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described above are executed.

[0030] The present invention further discloses a hydropower regulation system in an electricity market environment, comprising a memory and a processor connected to each other, wherein a computer program is stored on the memory, and when the computer program is run by the processor, the steps of the above method are executed.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] The hydropower adjustment method presented in this paper addresses the lack of a hydropower adjustment strategy in the security correction phase of clearing the electricity spot market. In addition to considering conventional hydropower operational constraints, it also considers the adjustment priorities of different hydropower plants to ensure fair competition among hydropower stations, providing a method for adjusting hydropower station output and electricity consumption. This solution ensures the rationality and reliability of hydropower station generation plans, mitigates overloads in cross-section line currents, and enhances the network security of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a diagram illustrating an embodiment of the hydropower adjustment method of the present invention in a specific application. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 The figure shows the relationship between the spot market clearing steps and the safety verification and safety correction. The hydropower adjustment method of the present invention can be used in the optimization correction or manual intervention method in the safety correction. The optimization correction is based on the optimal closed-loop correction theory and uses the static safety domain for optimization calculation. The present invention focuses on the hydropower adjustment strategy in the optimization correction method.

[0036] The hydropower adjustment method in the power market environment provided by the embodiment of the present invention is specifically as follows:

[0037] Directly regulated hydropower is divided into three categories: regulating power plants, sub-regulating power plants and non-regulating power plants;

[0038] If there is an over-limit section in the clearing result, and increasing the output of a certain hydropower station can alleviate the congestion, the hydropower output is increased in the order of the regulating power plants in the safety correction optimization. The secondary regulating power plants participate in the adjustment according to the selected mode, and the non-regulating power plants participate in the adjustment according to the output changes of the designated regulating power plants;

[0039] The corresponding methods for reducing hydropower output are the same.

[0040] Specifically, for regulating power plants, when increasing output, according to the priority order of increasing output, the preset percentage of rated power for increasing output, and the preset percentage of rated power for decreasing output given by the Water Resources Department, each power plant is increased to the corresponding percentage of the preset percentage of rated power for increasing output, and then the output of the following power plants is increased. If all power plants have increased their output to the preset rated power and output still needs to be adjusted, the output of the power plants will be increased to the rated power from the beginning in order;

[0041] When reducing output, the Water Resources Department prioritizes the power plants for output reduction, reducing each plant's output to the percentage corresponding to the preset percentage of rated power before reducing the output of subsequent plants. If all plants have already reduced their output to the percentage corresponding to the preset percentage of rated power and output adjustment is still required, the power plants' output will be reduced from the beginning to the corresponding lower output limit. Furthermore, the Water Resources Department specifies the minimum ecological power capacity for each plant, and each plant's output must not fall below this value.

[0042] Specifically, for the secondary regulation power plant, two modes are set: sorting regulation and upstream power generation regulation. When sorting regulation is selected, it is the same as the regulation power plant mode, participating in the sorting. In addition to the preset rated power percentage value and the minimum ecological power, the water new department also gives the initial maximum power. The actual maximum power is calculated according to the following formula: actual maximum power = initial maximum power + upstream power plant power * coefficient. When the output is increased, the total power does not exceed the actual maximum power.

[0043] When the upstream power generation regulation mode is selected, the power of the current regulating power plant is adjusted synchronously with its upstream power plant (regulating power plant) according to the power ratio given by the water source.

[0044] Specifically, for unregulated power plants, a power plant output plan is formulated according to a certain proportion of the output of the designated power plant, with a time lag of two time periods.

[0045] Specifically, when modeling the hydropower adjustment strategy based on the conventional operation constraints of the hydropower plant, the corresponding objective function is:

[0046]

[0047] Among them, C i,t (P i,t ) is the operating cost of the unit, is the startup cost of the unit, M1 is the penalty factor of network security constraint, are the positive and negative slack variables of the section constraint, M H is the penalty factor for abandoned hydropower, is the amount of abandoned hydropower by hydropower plant i at time t; Ω1 is an ordered set of all regulating power plants, and the hydropower plant at the kth adjustment order is: j k ∈Ω1={j1...j k ...j n}, Ω2 is an ordered set containing all secondary regulating power plants; They are the output-increasing variables of the primary and secondary sequencing regulation of the units in the hydropower plant; are the output reduction variables of the first-level and second-level sequencing regulation of the hydropower plant respectively; For hydropower plants k The penalty factors of the first and second level ranking adjustment should have the following relationship with the penalty factors of abandoned hydropower and over-limit: This relationship uses the penalty cost in the objective function to regulate hydropower, indicating that hydropower plant regulation should first alleviate section congestion and then minimize the amount of abandoned hydropower. Based on the regulation strategy, hydropower plant output should first be adjusted to the preset rated power and then adjusted back to the rated power from the beginning.

[0048] Specifically, for the power consumption constraint of hydropower plants, the two-level ranking adjustment formula for regulating power plants is:

[0049]

[0050] in, and Representing hydropower plants k The percentage of the preset rated power for reducing or increasing output; For hydropower plants k Rated power capacity; This is the planned electricity volume obtained by optimizing the clearing of the unit. A single period is 15 minutes. When calculating electricity volume, a unified unit (MWh) is used. The total output is divided by 4 to obtain the change in electricity volume after adding or subtracting power.

[0051]

[0052] In the secondary regulation, the corresponding electricity volume after the power plant reduces its output should not be lower than the minimum ecological electricity volume of the power plant.

[0053] Specifically, the formula for the two-stage sequencing regulation mode selected by the secondary regulating power plant is:

[0054]

[0055] in, Indicates power plant j k The initial maximum charge, for j k Upstream power plant up(j k ) of electricity, For power plants k When the units under the secondary regulation power plant increase their output, the power plant power should not exceed the actual maximum power.

[0056] Specifically, the formula for the secondary regulating power plant to select the upstream power generation regulation mode is:

[0057]

[0058] Secondary regulating power plant k The power deviation after adjusting the output must be equal to that of the upstream power plant up(jk) The power deviation corresponding to the output adjustment (belonging to the regulating power plant) The adjustment ratio determined by the Water Conservancy Department.

[0059] Specifically, the formula for the non-regulating power plant to formulate an output plan based on a specific regulating power plant is:

[0060]

[0061] During the above adjustment process, the upper and lower limits of the hydropower plant unit output are:

[0062]

[0063] α i,t is the operating state variable of unit i at time t, The optimal output of unit i at time t is are the lower and upper limits of the output of unit i at time t, respectively.

[0064] The constraints for determining the amount of abandoned hydropower in cascaded hydropower are:

[0065]

[0066] h i is the water consumption rate of hydropower station i, in m3 / MW*h, is the water discharge of hydropower station i in period t.

[0067] The hydropower adjustment method presented in this paper addresses the lack of a hydropower adjustment strategy in the security correction phase of clearing the electricity spot market. In addition to considering conventional hydropower operational constraints, it also considers the adjustment priorities of different hydropower plants to ensure fair competition among hydropower stations, providing a method for adjusting hydropower station output and electricity consumption. This solution ensures the rationality and reliability of hydropower station generation plans, mitigates overloads in cross-section line currents, and enhances the network security of the power system.

[0068] The present invention also discloses a computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program performs the steps of the above-described method. The present invention further discloses a hydropower regulation system in an electricity market environment, comprising an interconnected memory and a processor. The memory has a computer program stored thereon. When executed by the processor, the computer program performs the steps of the above-described method. The medium and system of the present invention correspond to the above-described method and possess the same advantages as those described above.

[0069] The present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned method embodiment. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable storage media include: any entity or device that can carry computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. The memory is used to store computer programs and / or modules, and the processor implements various functions by running or executing computer programs and / or modules stored in the memory, and calling data stored in the memory. The memory may include high-speed random access memory and non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0070] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A hydropower adjustment method in an electricity market environment, characterized in that: include: Directly regulated hydropower is divided into three categories: regulating power plants, sub-regulating power plants and non-regulating power plants; Different hydropower adjustment methods are adopted for different power plants. Specifically, if there is an over-limit section in the clearing result, and increasing the output of a certain hydropower station can alleviate the congestion, the regulating power plants will increase the hydropower output in sequence, the secondary regulating power plants will participate in the adjustment according to the selected mode, and the non-regulating power plants will participate in the adjustment according to the output changes of the designated regulating power plants; The process of the secondary regulating power plant participating in the adjustment according to the selected mode is as follows: Two modes can be set: sorting adjustment and upstream power generation adjustment. When sorting adjustment is selected, the same as the power plant adjustment method is used. In addition to the preset rated power percentage value and minimum ecological power, the initial maximum power is also given. The actual maximum power is calculated according to the following formula: actual maximum power = initial maximum power + upstream power plant power * coefficient. When increasing output, the total power does not exceed the actual maximum power. When the upstream power generation regulation mode is selected, the power of the current regulating power plant is adjusted synchronously with the upstream regulating power plant according to the power ratio given by the water source.

2. The hydropower adjustment method under the power market environment according to claim 1, characterized in that: The process of adjusting the power plant sequence to increase hydropower output is: When increasing output, the priority order of increasing output, the preset percentage of rated power for increasing output, and the preset percentage of rated power for decreasing output of the power plants are adjusted. After the power plants are increased to the corresponding percentage of the preset percentage of rated power for increasing output, the output of the subsequent power plants is increased. If all power plants have increased their output to the preset rated power and output still needs to be adjusted, the output of the power plants will be increased to the rated power from the beginning in sequence.

3. The hydropower adjustment method under the power market environment according to claim 2, characterized in that: The two-stage sequencing regulation formula for regulating power plants is: in, and Representing hydropower plants The percentage of the preset rated power for reducing or increasing output; For hydropower plants Rated power capacity; This is the planned electricity volume obtained by optimizing the clearing of the unit. A single period is 15 minutes. When calculating electricity volume, the unified unit is MWh. The change in electricity volume after adding or subtracting power is obtained by dividing the total output by 4. 、 They are the output-increasing variables of the primary and secondary sequencing regulation of the units in the hydropower plant; 、 are the output reduction variables of the first-level and second-level sequencing regulation of the hydropower plant respectively; In the secondary regulation, the corresponding electricity volume after the power plant reduces its output should not be lower than the minimum ecological electricity volume of the power plant.

4. The hydropower adjustment method in the power market environment according to claim 1, characterized in that: The secondary regulation power plant adopts the two-stage sequencing regulation mode: and Representing hydropower plants The percentage of the preset rated power for reducing or increasing output; For hydropower plants Rated power capacity; Planned electricity volume obtained through unit clearing optimization; Indicates power plant The initial maximum charge, for Upstream power plants of electricity, For power plants The power adjustment coefficient; when the units under the secondary regulation power plant increase their output, the power plant power should not be higher than the actual maximum power.

5. The hydropower adjustment method under the power market environment according to claim 4, characterized in that: The formula for selecting the upstream power generation regulation mode for the secondary regulating power plant is: Secondary regulating power plant The power deviation after adjusting the output must be equal to that of the upstream power plant The output adjustment corresponds to the power deviation, The adjustment ratio determined by the Water Conservancy Department.

6. The hydropower adjustment method under the power market environment according to claim 1, 2 or 3, characterized in that: The formula for the non-regulating power plant to participate in the adjustment according to the output change of the designated regulating power plant is: 、 They are the output-increasing variables of the primary and secondary sequencing regulation of the units in the hydropower plant; 、 are the output reduction variables of the first-level and second-level sequencing regulation of the hydropower plant respectively; For hydropower plant.

7. The hydropower adjustment method under the power market environment according to claim 1, 2 or 3, characterized in that: The objective function of the hydropower adjustment method is: in, is the operating cost of the unit, is the startup cost of the unit, is the penalty factor for network security constraints, 、 are the forward and reverse slack variables of the section constraint, is the penalty factor for abandoned hydropower, is the amount of water abandoned by hydropower plant i at time t; 、 They are the output-increasing variables of the primary and secondary sequencing regulation of the units in the hydropower plant; 、 are the output reduction variables of the first-level and second-level sequencing regulation of the hydropower plant respectively; 、 For hydropower plants The penalty factor for the first and second level sorting adjustment.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the computer program performs the steps of the method according to any one of claims 1 to 7.

9. A hydropower regulation system in an electricity market environment, comprising a memory and a processor connected to each other, wherein a computer program is stored in the memory, characterized in that: When the computer program is executed by a processor, the computer program performs the steps of the method according to any one of claims 1 to 7.

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