Calculation method for optimal operation number of hydroelectric generating sets

Abstract

The invention provides a method for calculating the optimal operation number of hydroelectric generating sets. The method comprises the following modules: an arrangement algorithm module for starting and stopping priorities of the generating sets; an algorithm module with the optimal start-up and shut-down number; a continuous deviation correction algorithm module; an automatic power-on process module; an automatic shutdown process module; according to an active plan curve issued by a scheduling mechanism as a reference, in combination with a frequency modulation demand, an operation requirement and limitation of the scheduling mechanism on a power plant AGC control mode and a unit intelligent start-stop condition, load distribution optimization and unit intelligent start-stop are realized through cooperation with AGC; intelligent startup and shutdown are achieved, basic operation of operators is reduced, and the startup number of the whole plant is determined in an optimal mode under the condition that the requirements of loads, standby capacity, frequency modulation markets and the like are met; frequent unit starting and stopping are avoided; and the operation duration of the limited operation area and the vibration area of each unit is balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydropower units, and more specifically, to a method for calculating the optimal number of operating units of a hydropower unit. Background Art

[0002] With the increasing complexity of the power grid and the widespread access of renewable energy, the stable operation of hydropower units in the power system has become particularly important; the optimization method and device for active power control of a hydropower unit monitoring system proposed in Chinese Patent Application No.: CN202211071531.0, the method includes: constructing a power control model for the hydropower unit monitoring system, importing the basic parameters and initial conditions for solving the model; setting the relevant parameters of the multi-objective genetic algorithm; obtaining an individual represented by a decision variable set, inputting it into the model to obtain the active power adjustment thread of the hydropower unit, and constructing an objective function according to the optimization index obtained from the adjustment thread; using an improved multi-objective genetic algorithm to solve the control model to obtain an optimal solution set; obtaining the decision variable set with the optimal objective function value from the optimal solution set for active power control of the hydropower unit. The present invention optimizes the main control parameters of the hydropower unit monitoring system through the cooperation of the power control model of the hydropower unit monitoring system and the improved multi-objective genetic algorithm, with better optimization effect and improved power regulation quality of the monitoring system.

[0003] However, there are still some deficiencies in the existing calculation process of the optimal number of operating units of hydropower units that need to be improved. First, it is necessary for manual workers to plan the output of the plant units in advance according to the dispatching automatic generation control plan curve, and combine the unit conditions to plan the rotation of unit start-up and shutdown.

[0004] For units with various industrial control restrictions on operation, there will be a large deviation between the manually planned number of start-up and shutdown units and the optimal result, which will lead to a large deviation between the plant output and the planned output, thus requiring manual secondary adjustment. Traditional automatic start-up and shutdown only consider a single operating mode, with limited practicality. Therefore, we make improvements in this regard and propose a method for calculating the optimal number of operating units of a hydropower unit. Summary of the Invention

[0005] The purpose of the present invention is to address the problems raised in the existing background art. In order to determine the number of units started up in the whole plant in the optimal way under the conditions of meeting the requirements of load, reserve capacity, frequency modulation market, etc.; avoid frequent start-up and shutdown of units; balance the operation duration of the restricted operation areas and vibration areas of each unit; and avoid the combined vibration area of the whole plant as the design principle of the calculation method, the present invention provides the following technical solutions: A method for calculating the optimal number of operating units of a hydropower unit, including the following modules: S1 Arrangement algorithm module for the start-up and shutdown priority of units; S2 Algorithm module for the optimal number of start-up and shutdown; S3 Continuous deviation correction algorithm module; S4 Automatic start-up process module; S5 Automatic shutdown process module.

[0006] As a preferred technical solution of the present invention, the arrangement algorithm module for the start-up and shutdown priorities of the S1 unit includes an S1.1 manual setting unit and an S1.2 automatic setting unit.

[0007] As a preferred technical solution of the present invention, the operation of the S1.2 automatic setting unit includes: S1.2.1 accumulating the operating time of the unit in the restricted operating area; S1.2.2 accumulating the operating time of the unit; S1.2.3 accumulating the shutdown time of the unit; S1.2.4 accumulating the operating time of the unit in the vibration area.

[0008] As a preferred technical solution of the present invention, the algorithm module for the optimal number of start-ups and shutdowns of the S2 unit includes an S2.1 start-up quantity calculation unit and an S2.2 shutdown quantity calculation unit.

[0009] As a preferred technical solution of the present invention, the operation of the S2.1 start-up quantity calculation unit includes the following steps:

[0010] S2.1.1 Conventional start-up planning module, which calculates the number of units to be operated at each time point in real time, compares them before and after, calculates the number, numbers and times of units to be started and stopped in advance, and starts the units 15 minutes in advance according to the current number of operating units and the minimum number of operating units;

[0011] S2.1.2 Emergency start-up planning module, which calculates in real time according to the external curve change situation, adjusts the unit start-stop rules in time, and adds "emergency start-up due to load curve change";

[0012] S2.1.3 Unit start-up number judgment module, which, after being confirmed by the upper computer system, issues a start-up command to the unit, and then the curve device program of the unit judges the number of units. When the unit is in the "power generation state", it is judged that the unit is in power generation operation.

[0013] As a preferred technical solution of the present invention, the operation of the S2.2 shutdown quantity calculation unit includes the following steps:

[0014] S2.2.1 Conventional shutdown planning module, which calculates the number of units to be operated at each time point in real time, compares them before and after, calculates the number of units to be shut down in advance; shuts down according to the current number of operating units and the minimum number of operating units; the current number of operating units is greater than the calculated number of units to be started, and it lasts for more than 1.5 hours;

[0015] S2.2.2 Emergency shutdown planning module, which calculates in real time according to the external curve change situation, adjusts the unit start-stop rules in time, and adds "emergency shutdown due to load curve change";

[0016] S2.2.3 Unit Shutdown Number Judgment Module, whose function is that after the host computer system confirms, it sends the "Load Reduction and Shutdown" instruction to the unit, and then the curve device program judges the number of units. After the unit is disconnected from the grid, the curve device judges that the unit is in standby shutdown;

[0017] S2.2.4 Shutdown Planning Execution Blocking Module, whose function is that when AGC group control has only one unit, it blocks the shutdown, that is, when only one unit is running, automatic shutdown is not allowed.

[0018] As a preferred technical solution of the present invention, the S3 Continuous Deviation Correction Algorithm Module includes an S3.1 Test and Special Condition Processing Unit and an S3.2 Short-Term Load Surge Operation Processing Unit.

[0019] As a preferred technical solution of the present invention, for the S3.1 Test and Special Condition Processing Unit, when the actual number of operating units is inconsistent with the program, the background gives an alarm and exits the intelligent start-stop function; for the S3.2 Short-Term Load Surge Operation Processing Unit, when considering the maximum adjustable capacity for the number of units to be started, within the range of meeting the maximum adjustable capacity, if it is necessary to start a unit but only run for 5 minutes (tentative), the unit will not be started and the current number will be maintained.

[0020] As a preferred technical solution of the present invention, the S4 Automatic Startup Process Module; receives the active power plan curve from the dispatching agency as the basic data for the startup process, analyzes the current and future load demands according to the active power plan curve, determines the number of units to be started, and checks the operating status of each unit to ensure that the unit is in a startable state without faults or maintenance restrictions. According to the optimized startup plan, automatically send the startup instruction to the corresponding unit.

[0021] As a preferred technical solution of the present invention, the S5 Automatic Shutdown Process Module; receives the active power plan curve from the dispatching agency as the basic data for the shutdown process; analyzes the shutdown demand: analyzes the current and future load demands according to the active power plan curve, determines the number of units to be shut down; and calculates the shutdown with the optimal start-stop quantity to determine the shutdown sequence and time of each unit; checks the operating status of each unit to ensure that the unit is in a stoppable state without faults or maintenance restrictions; according to the optimized shutdown plan, automatically send the shutdown instruction to the corresponding unit.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: In the solution of the present invention, based on the active power plan curve issued by the dispatching agency, combined with the frequency modulation requirements, operation requirements, and the AGC control mode of the power plant and the intelligent start-stop conditions of the units by the dispatching agency, the load distribution optimization and the intelligent start-stop of the units are realized through cooperation with AGC; intelligent start-up and shutdown are realized, the basic operations of the operating personnel are reduced, and the optimal way is determined to determine the number of units started up in the whole plant under the conditions of meeting the requirements of load, reserve capacity, frequency modulation market, etc.; frequent start-up and shutdown of the units are avoided; the operation duration of the restricted operation areas and vibration areas of each unit is balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the model provided by the present invention;

[0024] Figure 2 It is a module diagram of the unit start-up and shutdown priority arrangement algorithm provided by the present invention;

[0025] Figure 3 It is a module diagram of the optimal start-up and shutdown number algorithm provided by the present invention;

[0026] Figure 4 It is a module diagram of the continuous correction deviation algorithm provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0028] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the present invention claimed, but merely represents some embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. It should be noted that, without conflict, the embodiments and the features and technical solutions in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] Embodiment 1: Please refer to Figures 1-4 , a calculation method for the optimal number of operating units of a hydropower unit, including the following modules: S1 unit start-up and shutdown priority arrangement algorithm module; S2 optimal start-up and shutdown number algorithm module; S3 continuous correction deviation algorithm module; S4 automatic start-up process module; S5 automatic shutdown process module.

[0030] The algorithm module for arranging the start-up and shutdown priorities of Unit S1 includes the manual setting unit S1.1 and the automatic setting unit S1.2.

[0031] The operation of the automatic setting unit S1.2 includes: S1.2.1 accumulating the operating time of the unit in the restricted operating area; S1.2.2 accumulating the operating time of the unit; S1.2.3 accumulating the shutdown time of the unit; S1.2.4 accumulating the operating time of the unit in the vibration area.

[0032] The algorithm module for the optimal number of start-ups and shutdowns of S2 includes the start-up number calculation unit S2.1 and the shutdown number calculation unit S2.2.

[0033] The operation of the start-up number calculation unit S2.1 includes the following steps:

[0034] S2.1.1 Conventional start-up planning module. The conventional start-up planning module calculates the number of units that need to operate at each time point in real time, compares them before and after, calculates the number, numbers, and times of the units that need to be started and stopped in advance, and starts the units 15 minutes in advance according to the current number of operating units and the minimum number of operating units.

[0035] S2.1.2 Emergency start-up planning module. The emergency start-up planning module calculates in real time according to the external curve change situation, adjusts the unit start-up and shutdown rules in time, and adds "emergency start-up due to load curve change".

[0036] S2.1.3 Unit start-up number judgment module. After the upper computer system confirms, the start-up instruction is sent to the unit, and the curve device program judges the number of units. When the unit is in the "power generation state", it is judged that the unit is in power generation operation.

[0037] The operation of the shutdown number calculation unit S2.2 includes the following steps:

[0038] S2.2.1 Conventional shutdown planning module. Its function is to calculate the number of units that need to operate at each time point in real time, compare them before and after, and calculate the number of units that need to be shut down in advance; shut down according to the current number of operating units and the minimum number of operating units; the current number of operating units is greater than the calculated number of units to be started, and it lasts for more than 1.5 hours.

[0039] S2.2.2 Emergency shutdown planning module. Its function is to calculate in real time according to the external curve change situation, adjust the unit start-up and shutdown rules in time, and add "emergency shutdown due to load curve change".

[0040] S2.2.3 Unit shutdown number judgment module. Its function is that after the upper computer system confirms, the "load reduction and shutdown" instruction is sent to the unit, and the curve device program judges the number of units. When the unit is disconnected, the curve device judges that the unit is in shutdown standby.

[0041] S2.2.4 Shutdown Planning Execution Blocking Module, whose function is to block shutdown when there is only one unit in AGC group control, that is, when only one unit is running, automatic shutdown is not allowed.

[0042] The S3 Continuous Deviation Correction Algorithm Module includes S3.1 Test and Processing Unit under Various Special Conditions and S3.2 Processing Unit for Short-term Load Surge Operation.

[0043] S3.1 Test and Processing Unit under Various Special Conditions: When the actual number of operating units in the test and processing unit under various special conditions is inconsistent with the program, the background gives an alarm and exits the intelligent start-stop function; S3.2 Processing Unit for Short-term Load Surge Operation: The processing unit for short-term load surge operation needs to consider the maximum adjustable capacity when determining the number of units to start. Within the range of meeting the maximum adjustable capacity, if it is necessary to start a unit and only run for 5 minutes (tentatively), the unit will not be started, and the current number will be maintained.

[0044] S4 Automatic Startup Process Module; Receive the active power plan curve from the dispatching agency as the basic data for the startup process. According to the active power plan curve, analyze the current and future load demands, determine the number of units to start, and check the operating status of each unit to ensure that the unit is in a startable state without faults or maintenance restrictions. According to the optimized startup plan, automatically send startup instructions to the corresponding units.

[0045] S5 Automatic Shutdown Process Module; Receive the active power plan curve from the dispatching agency as the basic data for the shutdown process; Analyze the shutdown demand: According to the active power plan curve, analyze the current and future load demands, determine the number of units to shut down; And calculate the shutdown with the optimal start-stop quantity, determine the shutdown sequence and time of each unit; Check the operating status of each unit to ensure that the unit is in a stoppable state without faults or maintenance restrictions; According to the optimized shutdown plan, automatically send shutdown instructions to the corresponding units.

[0046] During the use of the present invention, for N hydropower units, the output of each unit is P_i (i = 1, 2,..., N), the power demand is D, the operating cost of the unit is C_i (including fixed cost and variable cost), and the efficiency of the unit is η_i. First, it is necessary to determine the output P_i of each unit under different water flow rates. This usually needs to be obtained through experiments or simulations. Then, a cost function can be constructed, which takes into account the operating costs of all units and the penalty cost brought by the unmet power demand.

[0047] The cost function can be expressed as:

[0048] C_total = Σ(C_i * x_i) + λ * max(0, D - Σ(P_i * x_i))

[0049] Among them, \(x_i\) is a binary variable indicating whether the \(i\)-th unit is operating (\(x_i = 1\) means operating, \(x_i = 0\) means shutdown). \(\lambda\) is the penalty cost coefficient used to adjust the cost brought by unmet power demand.

[0050] To find the optimal number of operating units, we need to minimize \(C_{total}\). This can be achieved by solving an integer programming problem. Specifically, the following formula can be used:

[0051] \(\min\sum(C_i * x_i)+\lambda*\max(0,D - \sum(P_i * x_i))\)

[0052] \(\sum x_i\leq N\)

[0053] \(x_i\in\{0,1\}, i = 1,2,\cdots,N\)

[0054] Among them, the first constraint means that the number of simultaneously operating units cannot exceed \(N\). The second constraint means that \(x_i\) must be a binary variable.

[0055] By solving this integer programming problem, we can obtain the optimal number of operating units, that is, the value of \(x_i\) that minimizes \(C_{total}\).

[0056] Formula considering unit startup and shutdown costs

[0057] \(C_{total}=\sum(C_{fixed\_i} * x_i)+\sum(C_{variable\_i} * P_i * x_i)\)

[0058] \(+\sum(C_{start\_i}*(x_i - x_{i\_prev}))+\lambda*\max(0,D - \sum(P_i * x_i))\)

[0059] Among them, \(C_{fixed\_i}\) is the fixed cost of the \(i\)-th unit, \(C_{variable\_i}\) is the variable cost of the \(i\)-th unit (related to the output), \(C_{start\_i}\) is the startup cost of the \(i\)-th unit, and \(x_{i\_prev}\) is the operating state of the \(i\)-th unit in the previous time period (1 means operating, 0 means shutdown). This formula takes into account the costs of unit startup and shutdown, which is very important for units with frequent startups and shutdowns.

[0060] Formula considering the minimum and maximum number of operating units

[0061] \(min\_units=\min(N,\lceil D / \min(P_i)\rceil)\)

[0062] \(max\_units=\min(N,\lfloor D / \max(P_i)\rfloor)\)

[0063] C_total = Σ(C_i * x_i) + λ * max(0, D - Σ(P_i * x_i))

[0064] min_units <= Σx_i <= max_units

[0065] x_i ∈ {0, 1}, i = 1, 2,..., N

[0066] In this formula, min_units and max_units respectively represent the minimum and maximum number of operating units required to meet the power demand D. These constraints ensure that the number of operating units is within a reasonable range.

[0067] Formula considering water flow limit

[0068] Q_total = Σ(Q_i * x_i)

[0069] C_total = Σ(C_i * x_i) + λ_1 * max(0, D - Σ(P_i * x_i)) + λ_2 * max(0, Q_max - Q_total)

[0070] Σx_i <= N

[0071] x_i ∈ {0, 1}, i = 1, 2,..., N

[0072] In this formula, Q_i is the water flow required for the i-th unit, Q_total is the total water flow required for all operating units, and Q_max is the maximum available water flow. λ_1 and λ_2 are penalty cost coefficients. This formula ensures that the water flow does not exceed the available limit.

[0073] Formula considering unit aging and maintenance

[0074] age_i = age_i_prev + (1 - x_i) * Δt

[0075] maintenance_cost_i = f(age_i)

[0076] C_total = Σ(C_fixed_i * x_i) + Σ(C_variable_i * P_i * x_i)

[0077] + Σ(maintenance_cost_i) + λ * max(0, D - Σ(P_i * x_i))

[0078] Σx_i <= N

[0079] x_i ∈ {0, 1}, i = 1, 2,..., N

[0080] In this formula, age_i represents the current age (or operating duration) of the i-th unit, age_i_prev is the age in the previous time period, Δt is the time step, and f(age_i) is a function that calculates the maintenance cost based on the unit age. This formula takes into account the impact of unit aging on maintenance costs and performance.

[0081] An algorithm module S1 for arranging the start-up and shutdown priorities of units after comprehensive analysis and calculation Figure 2 .

[0082] The manual unit S1.1 of the algorithm module for arranging the start-up and shutdown priorities of units introduces the cumulative operating time in the unit restricted operation area S1.2.1, the cumulative operating time of the unit S1.2.2, the cumulative shutdown time of the unit S1.2.3, and the cumulative operating time in the unit vibration area S1.2.4 into the automatic unit S1.2 of the algorithm module for arranging the start-up and shutdown priorities of units.

[0083] An algorithm module S2 for comprehensively calculating the optimal number of start-up and shutdown units of a power station's planned output curve for a future period Figure 3 .

[0084] The start-up quantity calculation unit S2.1.

[0085] The conventional start-up planning module S2.1.1, whose function is to calculate the number of units that need to run at each time point in real time, compare before and after, and calculate the number, numbers, and times of units that need to be started and stopped in advance. Start up the units 15 minutes in advance according to the current number of operating units and the minimum number of operating units.

[0086] The emergency start-up planning module S2.1.2, whose function is to calculate in real time according to the changes in the external curve, adjust the start-up and shutdown rules of the units in a timely manner, and add "emergency start-up due to load curve changes".

[0087] The unit start-up number judgment module S2.1.3, whose function is to judge the number of units in the curve device program of the unit after the upper computer system confirms and issues the start-up instruction. When the unit is in the "power generation state", it judges that the unit is in power generation operation.

[0088] The shutdown quantity module S2.2.

[0089] The conventional shutdown planning module S2.2.1, whose function is to calculate the number of units that need to run at each time point in real time, compare before and after, and calculate the number of units that need to be shut down in advance. Shut down the units according to the current number of operating units and the minimum number of operating units. The current number of operating units is greater than the calculated number of units to be started, and it lasts for more than 1.5 hours.

[0090] Emergency shutdown planning module S2.2.2, which is used to calculate in real time according to the external curve changes, adjust the unit start-stop rules in a timely manner, and add "emergency shutdown due to load curve changes".

[0091] Unit shutdown number judgment module S2.2.3, which is used to issue the "load reduction and shutdown" instruction to the unit after the host computer system confirms, and the curve device program of the unit judges the number of units. When the unit is disconnected from the grid, the curve device judges that the unit is in shutdown standby.

[0092] Shutdown planning execution locking module S2.2.4, which is used to lock the shutdown when there is only one unit in AGC group control, that is, when only one unit is running, automatic shutdown is not allowed.

[0093] An algorithm module S3 that can continuously correct the deviation between the number of start-stop operations in the plan and the optimal result Figure 4 。

[0094] Processing unit S3.1 under tests and various special working conditions, which is used to give an alarm in the background and exit the intelligent start-stop function when the actual number of operating units is inconsistent with the program.

[0095] Processing unit S3.2 for short-term load surge operation, which is used to consider the maximum adjustable capacity for the number of units to be started. If it is necessary to start a unit within the range of the maximum adjustable capacity, and if it is judged that the unit only needs to run for 5 minutes (tentative), the unit will not be started, and the current number of units will be maintained.

[0096] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above-mentioned various embodiments, the present invention is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the invention are covered by the scope of the claims of the present invention.

Claims

1. A calculation method for the optimal number of operating units of a hydropower unit, characterized in that It includes the following modules: S1 unit start-up and shutdown priority arrangement algorithm module; S2 optimal start-up and shutdown quantity algorithm module; S3 continuous deviation correction algorithm module; S4 automatic start-up process module; S5 automatic shutdown process module.

2. The calculation method for the optimal number of operating units of a hydropower unit according to claim 1, characterized in that The S1 unit start-up and shutdown priority arrangement algorithm module includes S1.1 manual setting unit and S1.2 automatic setting unit.

3. The calculation method for the optimal number of operating units of a hydropower unit according to claim 2, characterized in that, The operation of the S1.2 automatic setting unit includes: S1.2.1 accumulating the running time of the unit in the restricted operation area; S1.2.2 accumulating the running time of the unit; S1.2.3 accumulating the shutdown time of the unit; S1.2.4 accumulating the running time of the unit in the vibration area.

4. The calculation method for the optimal number of operating units of a hydropower unit according to claim 1, characterized in that, The S2 optimal start-up and shutdown quantity algorithm module includes S2.1 start-up quantity calculation unit and S2.2 shutdown quantity calculation unit.

5. The calculation method for the optimal number of operating units of a hydropower unit according to claim 4, characterized in that, The operation of the S2.1 start-up quantity calculation unit includes the following steps: S2.1.1 Conventional start-up planning module, which calculates the number of units to be run at each time point in real time, compares them before and after, calculates the number, numbers and times of units to be started and stopped in advance, and starts up 15 minutes in advance according to the current number of operating units and the minimum number of operating units. S2.1.2 Emergency start-up planning module, which calculates in real time according to the external curve change situation, adjusts the unit start-up and shutdown rules in time, and adds "emergency start-up due to load curve change". S2.1.3 Unit start-up number judgment module, which, after being confirmed by the upper computer system, issues a start-up instruction to the unit, and the curve device program judges the number of units. When the unit is in the "power generation state", it judges that the unit is in power generation operation.

6. The calculation method for the optimal number of operating units of a hydropower unit according to claim 5, characterized in that, The operation of the S2.2 shutdown quantity calculation unit includes the following steps: S2.2.1 Conventional shutdown planning module, which calculates the number of units to be run at each time point in real time, compares them before and after, calculates the number of units to be shut down in advance, shuts down according to the current number of operating units and the minimum number of operating units; the current number of operating units is greater than the calculated number of units to be started and has lasted for more than 1.5 hours. S2.2.2 Emergency shutdown planning module, which calculates in real time according to the external curve change situation, adjusts the unit start-up and shutdown rules in time, and adds "emergency shutdown due to load curve change". S2.2.3 Unit shutdown number judgment module, which, after being confirmed by the upper computer system, issues a "load reduction and shutdown" instruction to the unit, and the curve device program judges the number of units. When the unit is disconnected, the curve device judges that the unit is in shutdown standby. S2.2.4 Shutdown planning execution locking module, which locks the shutdown when AGC group control has only one unit, that is, when only one unit is running, automatic shutdown is not allowed.

7. The calculation method for the optimal number of operating units of a hydropower unit according to claim 1, characterized in that, The S3 continuous deviation correction algorithm module includes S3.1 test and processing unit under various working conditions and S3.2 load short-term surge operation processing unit.

8. The calculation method for the optimal number of operating units of a hydropower unit according to claim 7, characterized in that, S3.1 Test and processing unit under various working conditions. When the actual number of operating units of the test and processing unit under various working conditions is inconsistent with the program, the background alarms and exits the intelligent start-stop function; S3.2 Processing unit for short-term load surge operation. When considering the maximum regulation capacity for the number of units to be started up during short-term load surge operation, if it is determined that the units need to be started up only for 5 minutes (tentative) within the range of meeting the maximum regulation capacity, the units are not started up, and the current number of operating units is maintained.

9. The calculation method for the optimal number of operating units of a hydropower unit according to claim 1, characterized in that S4 Automatic start-up process module; Receive the active power plan curve from the dispatching agency as the basic data for the start-up process. According to the active power plan curve, analyze the current and future load demands, determine the number of units to be started up, and check the operating status of each unit to ensure that the units are in the start-up state without faults or maintenance restrictions. According to the optimized start-up plan, automatically send the start-up command to the corresponding units.

10. The calculation method for the optimal number of operating units of a hydropower unit according to claim 1, characterized in that, S5 Automatic shutdown process module; Receive the active power plan curve from the dispatching agency as the basic data for the shutdown process; analyze the shutdown requirements: according to the active power plan curve, analyze the current and future load demands, determine the number of units to be shut down; calculate the shutdown with the optimal start-stop quantity, determine the shutdown sequence and time of each unit; check the operating status of each unit to ensure that the units are in the shutdown state without faults or maintenance restrictions; according to the optimized shutdown plan, automatically send the shutdown command to the corresponding units.

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