Water and electricity adjusting method, medium and system in electricity market environment

Abstract

The invention discloses a hydropower adjustment method, medium and system in an electricity market environment, and the method comprises the steps: dividing direct adjustment hydropower into three types, namely an adjustment power plant, a secondary adjustment power plant and a non-adjustment power plant; different hydropower adjustment methods are adopted according to different power plants, specifically, if an out-of-limit section exists in a clearing result, and when the output of a certain hydropower station is increased to relieve blockage, the power plants are adjusted to increase the hydropower output in sequence, the secondary adjustment power plants participate in adjustment according to a selection mode, and the non-adjustment power plants participate in adjustment according to the output change of the specified adjustment power plants. The method has the advantages that reasonability and reliability of a hydropower station power generation plan are guaranteed, overload of section line power flow is relieved, and network safety of a power system is improved.

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] At present, the construction of power spot markets in some provinces faces many prominent problems, such as tight balance of power and electricity, strong market concentration, large proportion of non-market units, and many sections. Against the background of the rapid growth of the proportion of new energy installed capacity, the uncertainty of its power generation further increases the difficulty of spot market construction, resulting in a high probability of abnormal clearing risk after the market operation. In this context, higher requirements are put forward for the safety verification and post-correction of the power grid. In order to improve the level of power grid operation control in the market environment and alleviate power grid congestion, it is necessary to handle and intervene in the over-limit situation of related lines and sections after clearing, and evaluate the impact of power grid safety constraints on system operation and power trading. Therefore, after the safety verification and electricity price calculation module are completed, the output can be adjusted by closed-loop correction, manual correction and other methods in the safety correction link, thereby reducing the over-limit amount and reducing congestion, so as to achieve the purpose of maintaining the safe and stable operation of the power grid. As a non-market unit participating in the correction link, hydropower needs to finely consider its physical characteristics, operating parameters and upstream and downstream coupling relationships to adjust the output. In addition, it is necessary to ensure competition fairness and formulate an optimized control strategy for hydropower stations. Summary of the invention

[0003] In view of 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 to ensure the rationality and reliability of the power generation plan of the hydropower station, alleviate the overload of the section line flow, and improve 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 hydropower station can alleviate the congestion, the regulating power plants will increase the hydropower output sequentially, 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 plant sequence to increase the hydropower output 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 are adjusted according to the power plants. After each power plant is 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 been increased 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 in sequence from the beginning.

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

[0011]

[0012] in, and Representing hydropower plant k The percentage of power consumption of the preset rated power for reducing or increasing output; For hydropower plants k Rated power capacity; The planned electricity obtained by optimizing the clearing of the unit; a single period is 15 minutes, and the electricity is calculated in a unified unit of MWh. The total output is divided by 4 to obtain the change in electricity after adding or subtracting power;

[0013]

[0014] In the secondary regulation, the corresponding amount of electricity after the power plant reduces its output should not be lower than the minimum ecological electricity 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] There are two modes: sorting adjustment and upstream power generation adjustment. When sorting adjustment is selected, it is the same as adjusting the power plant. In addition to giving the preset rated power percentage value and the 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 the 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 will be adjusted synchronously with the upstream regulating power plant in proportion to the power given by the water source.

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

[0019]

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

[0021] Preferably, the formula for the secondary regulating power plant to select the upstream power generation regulation mode is:

[0022]

[0023] Secondary regulating power plant k The power deviation after adjusting the output should be equal to that of the upstream power plant up(jk) The output adjustment corresponds to the amount of power deviation, The adjustment ratio determined for the Water New 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 regulation 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 constraints, 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 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 ... n}, Ω2 is an ordered set of all secondary regulating power plants; They are the output increase variables of the primary and secondary sequencing regulation of the units in the hydropower plant; They are the output reduction variables of the primary and secondary 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 electric power 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 method described above are executed.

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

[0032] The hydropower adjustment method in the power market environment of the present invention solves the problem of the lack of hydropower adjustment strategy in the safety correction link of the power spot market clearing; in addition to considering the conventional hydropower operation constraints, in order to ensure the fairness of competition between hydropower stations, it further considers the adjustment priority of different hydropower plants and provides a method for adjusting the output and power of the hydropower station. This scheme ensures the rationality and reliability of the hydropower station's power generation plan, alleviates the overload of the cross-section line flow, and improves the network security of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] like Figure 1 The figure shows the connection 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 for 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 hydropower station can alleviate the congestion, the hydropower output is increased in the order of regulating power plants in the safety correction optimization, the secondary regulating power plants participate in the adjustment according to the selection 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 percentage of preset rated power and electricity, and the percentage of preset rated power and electricity reduction of the regulating power plants given by the Water and New Energy Department, each power plant is increased to the corresponding percentage of preset rated power and electricity, 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 electricity, and the output still needs to be adjusted, the output of the power plants is increased to the rated power and electricity from the beginning in order;

[0041] When reducing output, the priority order of reducing output of the regulating power plants given by the Water and New Energy Department is followed. After reducing the output of each power plant to the corresponding power percentage of the preset rated power, the output of the following power plants is reduced. If all power plants have reduced their output to the corresponding power percentage of the preset rated power, and the output still needs to be adjusted, the output of the power plants is reduced from the beginning in order to the corresponding output lower limit. In addition, the Water and New Energy Department gives the minimum ecological power of the power plant, and the corresponding power of each power plant shall not be lower than this value.

[0042] Specifically, for the secondary regulating power plant, two modes are set: sorting regulation and upstream power generation regulation. When sorting regulation is selected, it is the same as the regulating power plant mode and participates 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 constraints, 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 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 ... n}, Ω2 is an ordered set of all secondary regulating power plants; They are the output increase variables of the primary and secondary sequencing regulation of the units in the hydropower plant; They are the output reduction variables of the primary and secondary sequencing regulation of the hydropower plant respectively; For hydropower plants k The penalty factors of the first and second level sorting adjustment should satisfy the following relationship with the penalty factors of abandoned hydropower and over-limit: This size relationship uses the penalty cost size in the objective function to regulate and control hydropower, indicating that the regulation of the hydropower plant should first alleviate the section blockage, and then control the abandoned water volume as small as possible. Based on the regulation strategy, the output of the hydropower plant should first be adjusted to the preset rated power in sequence, and then adjusted to the rated power from the beginning in sequence.

[0048] Specifically, for the power constraint of hydropower plants, the two-level sequencing adjustment formula for adjusting power plants is:

[0049]

[0050] in, and Representing hydropower plant k The percentage of power consumption of the preset rated power for reducing or increasing output; For hydropower plants k Rated power capacity; The planned electricity volume obtained by optimizing the clearing of the unit; a single period is 15 minutes, and the electricity volume is calculated in a unified unit (MWh). 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 amount of electricity after the power plant reduces its output should not be lower than the minimum ecological electricity of the power plant.

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

[0054]

[0055] in, Indicates power plant j k The initial maximum charge, for j k The upstream power plant up(j k ) of the power, For power plants k When the units under the power plant are adjusted to increase their output, the power plant power should not be higher than 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 should be equal to that of the upstream power plant up(jk) The power deviation corresponding to the output adjustment (of the regulating power plant) The adjustment ratio determined for the Water New Department.

[0059] Specifically, the formula for the non-regulated power plant to formulate an output plan according to the specific regulated 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 day-ahead optimized output of unit i at time t, 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 in the power market environment of the present invention solves the problem of the lack of hydropower adjustment strategy in the safety correction link of the power spot market clearing; in addition to considering the conventional hydropower operation constraints, in order to ensure the fairness of competition between hydropower stations, it further considers the adjustment priority of different hydropower plants and provides a method for adjusting the output and power of the hydropower station. This scheme ensures the rationality and reliability of the hydropower station's power generation plan, alleviates the overload of the cross-section line flow, and improves the network security of the power system.

[0068] The present invention also discloses a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are executed. The present invention further discloses a hydropower regulation system in an electricity market environment, including a memory and a processor connected to each other, on which a computer program is stored, and when the computer program is executed by the processor, the steps of the above method are executed. The medium and system of the present invention correspond to the above method and also have the advantages described in the above method.

[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 the computer program can implement the steps of the above-mentioned method embodiment when executed by the processor. 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, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. 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 may also include non-volatile memory, such as a hard disk, an internal 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 devices.

[0070] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope 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 according to different power plants. Specifically: if there is an over-limit section in the clearing result, and increasing the output of a hydropower station can alleviate the congestion, the regulating power plants will increase the hydropower output sequentially, 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.

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 are adjusted according to the power plants. After each power plant is 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 been increased 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 in sequence from the beginning.

3. The hydropower adjustment method under the power market environment according to claim 2 is characterized in that: The two-stage sequencing regulation formula for regulating power plants is: in, and Representing hydropower plant k The percentage of power consumption of the preset rated power for reducing or increasing output; For hydropower plants k Rated power capacity; The planned electricity obtained by optimizing the clearing of the unit; a single period is 15 minutes, and the electricity is calculated in a unified unit of MWh. The total output is divided by 4 to obtain the change in electricity after adding or subtracting power; In the secondary regulation, the corresponding amount of electricity after the power plant reduces its output should not be lower than the minimum ecological electricity of the power plant.

4. The hydropower adjustment method under the power market environment according to claim 1, 2 or 3, characterized in that: The process of the secondary regulating power plant participating in the adjustment according to the selected mode is as follows: There are two modes: sorting adjustment and upstream power generation adjustment. When sorting adjustment is selected, it is the same as adjusting the power plant. In addition to giving the preset rated power percentage value and the 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 the 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 will be adjusted synchronously with the upstream regulating power plant in proportion to the power given by the water source.

5. The hydropower adjustment method under the power market environment according to claim 4, characterized in that: The two-stage sequencing regulation mode used by the secondary regulation power plant is: and Representing hydropower plant k The percentage of power consumption of the preset rated power for reducing or increasing output; For hydropower plants k Rated power capacity; The planned electricity volume obtained by optimizing the clearing of the unit; Indicates power plant j k The initial maximum charge, Q up(jk) for j k The upstream power plant up(j k ) of the electric quantity, λ jk For power plants k The power adjustment coefficient; when the units under the secondary adjustment power plant increase their output, the power plant power should not be higher than the actual maximum power.

6. The hydropower adjustment method under the power market environment according to claim 5, characterized in that: The formula for the secondary regulating power plant to select the upstream power generation regulation mode is: Secondary regulating power plant k The power deviation after adjusting the output should be equal to that of the upstream power plant up(jk) The power deviation corresponding to the output adjustment, β jk The adjustment ratio determined for the Water New Department.

7. The hydropower adjustment method under the power market environment according to claim 1, 2 or 3, characterized in that: 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:

8. 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 regulation method is: 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 constraints, 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 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 of all secondary regulating power plants; They are the output increase variables of the primary and secondary sequencing regulation of the units in the hydropower plant; They are the output reduction variables of the primary and secondary sequencing regulation of the hydropower plant respectively; For hydropower plants k The penalty factor for the first and second level sorting adjustment.

9. 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 8.

10. 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 8.

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