Method for making daily power generation schedule of national direct water power station

Abstract

A kind of calculation method of daily power generation pre-plan making of national regulation direct regulation hydropower station, S1 daily power generation pre-plan safety check of whole plant;S2 daily power generation pre-plan making of substation;S3 daily power generation pre-plan safety check of substation and generate recommended power generation plan.The present application can check the safety of daily power generation pre-plan of whole plant, and intelligently distribute to form daily power generation pre-plan of substation, and the calculation result meets the requirements of unit stable zone operation, stable control machine trip, relevant requirements of power grid stable control regulation, meets the requirements of the lowest water level of reservoir downstream, water level amplitude of navigation, etc.The present application can be widely applied to daily power generation pre-plan making of hydropower station with two substations within the scope of national regulation management, especially for the hydropower station sensitive to downstream water level change in navigation dispatching, to ensure the safety of hydropower station power generation and downstream navigation and give consideration to economy.The present application simplifies the calculation amount of power generation plan distribution of direct regulation plant and station two substations, realizes the refinement, standardization and intelligentization of power generation plan distribution of direct regulation plant and station substations.

Description

Technical Field

[0001] This invention belongs to the field of power generation dispatching of hydropower stations directly dispatched by the State Grid Corporation of China, and specifically relates to a calculation method for the preparation of daily power generation pre-plans for hydropower stations directly dispatched by the State Grid Corporation of China. Background Technology

[0002] Large hydropower stations with two branch plants within the direct dispatch range of the national dispatch center are mainly for power generation, but also have functions such as navigation, flood control, irrigation and counter-regulation. The safety of power generation dispatch and the safety of navigation dispatch are both important factors affecting the dispatch of hydropower stations.

[0003] Large-scale hydropower stations of this type have a large total installed capacity and numerous generating units. Their operation is influenced by a wide range of factors, and the scheduling must strictly adhere to the power grid stability control regulations, including requirements for power station tripping capacity, number of generating units in operation, maximum output, and DC matching. Simultaneously, they must strictly comply with the reservoir scheduling regulations, including water level / flow control requirements such as minimum water level, maximum water level, daily / hourly water level fluctuations, and ecological flow.

[0004] The daily power generation plan for this type of hydropower station is first formulated based on constraints such as medium- and long-term transactions, reservoir scheduling requirements, grid load demand, power transmission, and power station maintenance restrictions, resulting in a total power generation plan for 96 points across the entire plant. After obtaining the overall power generation plan, the next step in compiling the power generation plans for individual plants is currently to manually allocate the plans to two separate plants based on factors such as grid operation requirements, shipping boundaries, unit maintenance, and stable unit operation. To reduce manual workload and improve efficiency and reliability, it is necessary to refine calculation methods from manual processes to provide algorithms for subsequent intelligent allocation and compilation of power generation plans. Summary of the Invention

[0005] In view of the technical problems existing in the background technology, the calculation method for the daily power generation plan of the national direct-dispatch hydropower station provided by the present invention is a calculation method that divides the power generation plan of the whole plant into two branch plant power generation plans. It has the functions of verifying the whole plant plan and automatically calculating the branch plant plan. At the same time, it meets multiple safety constraints such as unit tripping requirements, unit start-up requirements, load ramping to meet navigation requirements, unit stable operation requirements, and branch plant output matching DC transmission power requirements.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A calculation method for preparing a daily power generation forecast for a hydropower station directly regulated by the national power dispatch center, comprising the following steps:

[0008] Step S1: Conduct a safety check on the daily power generation plan of the entire hydropower station directly controlled by the national dispatch center;

[0009] Step S2: Prepare the daily power generation forecast for the branch plant of the hydropower station directly dispatched by the national dispatch center;

[0010] Step S3: Conduct a safety check on the daily power generation plan of the branch plant of the national dispatching hydropower station and generate a suggested power generation plan.

[0011] Preferably, the sub-step of step S1 is:

[0012] S1.1 Verification of the minimum navigable water level downstream of the reservoir: For the entire plant's 96-point power generation plan, the power generation flow rate corresponding to each output point must meet the minimum discharge flow rate requirement of the reservoir. 全厂 i This represents the plant's 96-point power generation plan, where X1 represents the power output corresponding to the minimum discharge flow at each reservoir water level, and P... 全厂 i X1 and X1 satisfy the following relationship:

[0013] P 全厂 i ≥X1(i=1...96, 96 time points from 00:15 to 24:00 each day);

[0014] S1.2, Daily variation of downstream reservoir water level verification: The difference in power generation flow rate corresponding to the maximum and minimum output in the plant's 96-point power generation plan must meet the daily variation requirement of the downstream reservoir water level. 全厂max To maximize output throughout the day; P 全厂min X2 represents the minimum output for the entire day; X2 represents the output difference required to meet the daily fluctuation of the downstream water level of the reservoir; P 全厂max P 全厂min X2 satisfies the following relationship:

[0015] P 全厂max =max(P 全厂 1, P 全厂 i ..., P 全厂 96 (i=1...96);

[0016] P 全厂min =min(P) 全厂 1 ,P 全厂 i ..., P 全厂 96 (i=1...96);

[0017] P 全厂max -P 全厂min ≤X2;

[0018] S1.3, Hourly Variation Verification of Downstream Reservoir Water Level: For the plant's 96-point power generation plan, the hourly peak shaving amount, rolled with a 15-minute precision, must correspond to changes in the reservoir's power generation flow rate that meet the hourly variation requirements of the downstream reservoir water level; △P hour represents the hourly peak shaving amount rolled with a 15-minute precision; X3 represents the output difference corresponding to meeting the hourly variation requirements of the downstream reservoir water level; △P satisfies the following relationship:

[0019] |△P hours| = |P 全厂 i -P 全厂 i+1 ∣+∣P 全厂 i+1 -P 全厂 i+2 ∣+∣P 全厂 i+2 -P 全厂 i+3 ∣+∣P 全厂 i+3 -P 全厂 i+4 |≤X3;

[0020] To prevent a sharp rise in downstream water levels, a single-point increase rate is also set, which must simultaneously satisfy the following relationship:

[0021] |P 全厂 i -P 全厂 i+1 |≤X3 / 4(i=1...96);

[0022] S1.4 Verification of Plant-wide Power Generation Capacity: The maximum power generation capacity of the entire plant is affected by factors such as head, unit maintenance, line maintenance, and DC maintenance. The maximum output during the plant's power generation plan should not exceed the plant's maximum power generation capacity. The plant's maximum power generation capacity X4 is a calculated value X4 that comprehensively considers the output constraints of head, maintenance, and operating mode. X4 satisfies the following relationship:

[0023] P 全厂max ≤X 4；

[0024] S1.5, Safety and Stability Verification of the Plant's Power Generation Plan: The start-up arrangement of the plant's 96 power generation plans must meet the minimum output requirements for the units to be switched on and off within the grid stability control regulations, as well as the stable operating requirements: Of the operating units in the plant, one unit in each branch plant of the power station must not be switched on, and the remaining units must be switched on and off; the output of the operating units must meet the stable operating requirements; when arranging the actual output, it should be considered that the output of the units not switched on and off must meet the requirement of not being lower than the lower limit of the stable operating zone, and the output of the remaining units to be switched on and off must meet the switching threshold value Y2 required by the grid.

[0025] T 全厂 iY1 represents the minimum number of units in operation at time i, PN represents the maximum upper limit of the stable operating range for a single unit under the current head, and Y1 represents the lower limit of the stable operating range. 全厂 i The following relationship must be satisfied:

[0026] T 全厂 i =ROUNDUP(P 全厂 i / PN, 0);

[0027] PN*T 全厂 i ≥P 全厂 i ≥Y1*2+(T 全厂 i -2) * Y2 (i=1...96);

[0028] S1.6 Verification of the connection between the daily power generation plan and the previous day's power generation plan; P 全厂 0 P represents the plant-wide planned value for the last output point of the previous day; 全厂 0 It can automatically read the value of the last point from the previous day's power generation plan data;

[0029] The connection between the first point's plan and the 0 point should ensure that the power generation plan does not change abruptly and meets the rolling hourly variation requirements; P 全厂 1 P 全厂 0 The following relationship must be satisfied:

[0030] | P 全厂 1 -P 全厂 0 | ≤X3 / 4;

[0031] Preferably, in steps S1.1-S1.6, if any step fails the verification, an alarm will be triggered and the process will be prompted to exit.

[0032] Preferably, the sub-step of step S2 is as follows:

[0033] S2.1, Read the last planned value of the previous day's power generation plan; P 全厂 0 P represents the plant's total power generation plan as of 24:00 the previous day. 分厂1 0 P 分厂2 0 These represent the branch plant's power generation plan at 24:00 the previous day; the corresponding number of generating units in operation for the two branch plants and the entire plant is T. 分厂1 0 T分厂2 0 ;

[0034] S2.2, Calculation of power generation plan allocation; when the total power of the entire plant remains unchanged, maintain the number of units in operation and the power of each branch plant from the previous day. During periods of power change, it is necessary to first determine whether to start or stop units, and the actual number of units in operation must meet the requirement of not exceeding the number of available units; T 分厂 i T 分厂 max, T 分厂 N T 分厂 检修 These represent the number of generators in operation at time i in the power plant branch;

[0035] T 分厂 max=T 分厂 N -T 分厂 检修 ;

[0036] 0 < T 分厂 i ≤T 分厂 max;

[0037] (1) Power-up period, i.e. P 全厂 i <P 全厂 i+1 ;

[0038] 1) No power-on is required, thus satisfying T. 全厂 i =ROUNDUP(P 全厂 i / PN, 0), PN represents the upper limit of the stable zone of a single unit under the water head, T 全厂 i =T 全厂 i+1 When power is increased, it is preferentially allocated to the branch plant with lower power. After the power reserve of the branch plant is fully increased, the remaining power is allocated to another branch plant. Therefore, it is necessary to meet the following requirements:

[0039] If: P 分厂1 i <P 分厂2 i ;

[0040] P 分厂旋备 i =T 分厂 i *PN-P 分厂 i ;

[0041] If P 全厂 i+1 -P 全厂i ≤P 分厂1旋备 i Then P 分厂1 i+1 =P 分厂1 i +(P) 全厂 i+1 -P 全厂 i ); T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 =P 分厂2 i ;T 分厂2 i+1 =T 分厂2 i ;

[0042] If P 全厂 i+1 -P 全厂 i >P 分厂1旋备 i Then P 分厂1 i+1 =P 分厂1 i +P 分厂1旋备 i ;T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;T 分厂2 i+1 =T 分厂2 i ;

[0043] If P 分厂2 i ≥P 分厂1 i Similarly, P can be calculated. 分厂2 i+1 T 分厂2 i+1 P 分厂1 i+1 T 分厂1 i+1 ;

[0044] 2) Requires powering on, T 全厂 i+1 >T 全厂 i Due to hourly fluctuation limitations, the number of units that can be added to the system at any given time cannot exceed one. Therefore, T 全厂 i+1 =T 全厂 i +1, additional generating units will be preferentially selected from plants with more standby units; therefore, this requirement must be met.

[0045] A. If Branch Plant 1 has more standby units, then additional units from Branch Plant 1 will be activated.

[0046] That is, if T 分厂1 max-T 分厂1 i ≥T 分厂2 max-T 分厂2 i ,

[0047] So T 分厂1 i+1 =T 分厂1 i +1, T 分厂2 i+1 =T 分厂2 i ,

[0048] At the same time, each branch plant's plans must meet the unit vibration zone and shutdown requirements; therefore, it is necessary to meet...

[0049] T 分厂1 i+1 *PN≥P 分厂1 i+1 ≥(Y1+(T 分厂1 i+1 -1) *Y2);

[0050] P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;

[0051] T 分厂2 i+1 *PN≥P 分厂2 i+1 ≥(Y1+(T 分厂2 i+1 -1) *Y2);

[0052] B. If Branch Plant 2 has more standby units, then Branch Plant 2 units will be added, i.e., if T 分厂1 max-T 分厂1 i <T分厂2 max-T 分厂2 i So T 分厂2 i+1 =T 分厂2 i +1, T 分厂1 i+1 =T 分厂1 i Meanwhile, each branch plant's plans must meet the unit vibration zone and shutdown requirements; therefore, the following must be met:

[0053] T 分厂2 i+1 *PN≥P 分厂2 i+1 ≥(Y1+(T 分厂2 i+1 -1) *Y2);

[0054] P 分厂1 i+1 =P 全厂 i+1 -P 分厂2 i+1 ;

[0055] T 分厂1 i+1 *PN≥P 分厂1 i+1 ≥(Y1+(T 分厂1 i+1 -1) *Y2);

[0056] (2) Power reduction period, i.e. P 全厂 i >P 全厂 i+1 ,

[0057] A. No downtime required; P 全厂 i+1 ≥(Y1+(T 全厂 i+1 -1) *Y2), T 全厂 i+1 =T 全厂 i When reducing the power of a branch plant with a large power output, and if no adjustable power output is available, the remaining reduction amount will be allocated to another branch plant; therefore, it is necessary to meet the following requirements.

[0058] P 分厂可调 i =P 分厂 i -(Y1+(T 分厂1 i -1) *Y2);

[0059] If: P 分厂1i ≥P 分厂2 i ;

[0060] If P 全厂 i+1 -P 全厂 i ≤P 分厂1可调容量 i Then P 分厂1 i+1 =P 分厂1 i +(P) 全厂 i+1 -P 全厂 i ); T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 =P 分厂2 i ;T 分厂2 i+1 =T 分厂2 i ;

[0061] If P 全厂 i+1 -P 全厂 i >P 分厂1可调容量 i Then P 分厂1 i+1 =P 分厂1 i +P 分厂1可调容量 i ;T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;T 分厂2 i+1 =T 分厂2 i ;

[0062] If P 分厂2 i >P 分厂1 i Similarly, P can be calculated. 分厂2 i+1T 分厂2 i+1 P 分厂1 i+1 T 分厂1 i+1 ;

[0063] B. Shutdown is required; P 全厂 i+1 < (Y1+ (T) 全厂 i+1 -1) *Y2), T 全厂 i+1 =T 全厂 i -1;

[0064] C. If the number of units in Branch Plant 1 is high, then the units in Branch Plant 1 should be shut down first. If T 分厂1 i ≥T 分厂2 i If one machine is parked on the left bank, then the condition is met.

[0065] T 分厂1 i+1 =T 分厂1 i -1;

[0066] T 分厂2 i+1 =T 分厂2 i ;

[0067] (Y1+(T) 分厂1 i+1 -1) * Y2) ≤ P 分厂1 i+1 ≤T 分厂1 i+1 *PN;

[0068] P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;

[0069] (Y1+(T) 分厂2 i+1 -1) * Y2) ≤ P 分厂2 i+1 ≤P 分厂2 i+1 *PN;

[0070] D. If the number of units in Branch Plant 2 is high, then the units in Branch Plant 2 should be shut down first. If T 分厂1 i <T 分厂2 iIf one aircraft is parked on the right bank, then the following condition is met:

[0071] T 分厂2 i+1 =T 分厂2 i -1;

[0072] T 分厂1 i+1 =T 分厂1 i ;

[0073] (Y1+(T) 分厂2 i+1 -1) * Y2) ≤ P 分厂2 i+1 ≤T 分厂2 i+1 *PN;

[0074] P 分厂1 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;

[0075] (Y1+(T) 分厂1 i+1 -1) * Y2) ≤ P 分厂1 i+1 ≤P 分厂1 i+1 *PN;

[0076] (3) The period of average power, i.e. P 全厂 i =P 全厂 i+1 Then P 分厂1 i+1 =P 分厂1 i ;P 分厂2 i+1 =P 分厂2 i ;T 分厂1 i+1 =T 分厂1 i ;T 分厂2 i+1 =T 分厂2 i .

[0077] Preferably, the decomposition step of step S3 is as follows:

[0078] S3.1, Branch Plant Power Generation Plan and DC Matching Verification; According to relevant regulations, the proportion of electricity transmitted to other provinces and retained during the flood and dry seasons differs for hydropower stations, especially point-to-grid hydropower stations. During the flood season, all electricity is transmitted to other provinces, while during the dry season, there is a C1 / C2 ratio between electricity transmitted to other provinces and electricity transmitted to other provinces. Therefore, it is necessary to meet the following requirements.

[0079] During the flood season, P 全厂 i =P 直流 i ;

[0080] Dry season, P 全厂 i / P 直流 i = (C1 + C2) / C2;

[0081] The regulations stipulate that there is a certain matching relationship between the DC transmission power and the output of a single plant; therefore, it is necessary to meet the following requirements.

[0082] P 直流 i ≥P 分厂1 i +X5; and P 直流 i ≥P 分厂2 i +X5, where X5 is related to the number of DC converters in operation;

[0083] If the above conditions are met, a power generation plan will be generated directly. If not, a parameter needs to be manually adjusted and P needs to be recalculated according to steps 2.1-2.2. 分厂1 i With P 分厂2 i， The final power generation plan for the branch plant is generated once all conditions are met.

[0084] The present invention can achieve the following beneficial effects:

[0085] 1. This invention can quickly calculate results, effectively improve the work efficiency of staff, and can quickly and efficiently generate branch plant plans when urgently modifying power generation plans.

[0086] 2. When there are many influencing factors and complex boundary changes, the present invention can make quick adjustments and has a verification process to improve the safety and reliability of the manufacturing process.

[0087] 3. This invention can be widely applied to hydropower stations within the national dispatching and control area that are sensitive to downstream water level changes and have two branch power plants. During the branch power plant power generation plan preparation process, the safety of reservoir operation and the stability and security of the power grid are strictly verified. Attached Figure Description

[0088] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0089] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0090] Preferred solutions include Figure 1 As shown, a calculation method for preparing a daily power generation forecast for a hydropower station directly regulated by the national power dispatch center includes the following steps:

[0091] S1. Safety verification of the plant's daily power generation plan;

[0092] S1.1 Verification of the minimum navigable water level downstream of the reservoir. For the entire plant's 96-point power generation plan, the power generation flow rate corresponding to each output point must meet the minimum discharge flow requirement of the reservoir. P 全厂 i This represents the plant's planned power generation at 96 points, where X1 represents the power output corresponding to the minimum discharge flow at each reservoir water level. Therefore, the following conditions must be met:

[0093] P 全厂 i ≥X1(i=1...96, 96 time points from 00:15 to 24:00 every day).

[0094] S1.2, Daily fluctuation of downstream water level in the reservoir. The difference in power generation flow rate corresponding to the maximum and minimum output in the plant's 96-point power generation plan must meet the daily fluctuation requirement of the downstream water level in the reservoir. 全厂max For maximum output throughout the day, P 全厂min X2 represents the minimum output for the entire day, and X2 represents the output difference required to meet the daily fluctuation requirements of the downstream water level of the reservoir. Therefore, the following must be satisfied:

[0095] P 全厂max =max(P 全厂 1, P 全厂 i ..., P 全厂 96 (i=1...96);

[0096] P 全厂min =min(P) 全厂 1 ,P 全厂 i ..., P 全厂 96 (i=1...96);

[0097] P 全厂max -P 全厂min ≤X2.

[0098] S1.3, Verification of Hourly Variation of Downstream Reservoir Water Level. The plant's 96-point power generation plan, with a rolling hourly peak-shaving rate of 15 minutes, must ensure that the corresponding changes in reservoir power generation flow meet the hourly variation requirements of the downstream reservoir water level. △P_hour represents the rolling hourly peak-shaving rate of 15 minutes, and X3 represents the output difference corresponding to meeting the hourly variation requirements of the downstream reservoir water level. Therefore, the following must be met:

[0099] |△P hours| = |P 全厂 i -P 全厂 i+1 ∣+∣P 全厂 i+1 -P 全厂 i+2 ∣+∣P 全厂 i+2 -P 全厂 i+3 ∣+∣P 全厂 i+3 -P 全厂 i+4 |≤X 3，

[0100] In actual operation, a single-point increase range is set to prevent a sharp rise in downstream water levels, therefore, it is necessary to simultaneously meet the following requirements.

[0101] |P 全厂 i -P 全厂 i+1 ∣≤X3 / 4(i=1...96)(i=1...96).

[0102] S1.4 Verification of the plant's total generating capacity. The plant's maximum generating capacity is affected by factors such as head, unit maintenance, line maintenance, and DC maintenance. The maximum output during the plant's power generation plan should not exceed the plant's maximum generating capacity. The plant's maximum generating capacity X4 is a calculated value that comprehensively considers head, maintenance, and operating conditions to determine output constraints. 4。 Therefore, the following must be satisfied:

[0103] P 全厂max ≤X 4。

[0104] S1.5, Safety and Stability Verification of the Plant-wide Power Generation Plan. The start-up arrangement corresponding to the plant's 96-point power generation plan must meet the following requirements: minimum output requirements for units switched on and off within the grid stability control regulations, and stable zone operation requirements. Specific requirements: Of the operating units in the entire plant, one unit in each branch plant should not be switched on, and the remaining units should be switched on and off; the output of all operating units must meet the stable zone operation requirements. When arranging the actual output, the output of the unit not switched on should meet the following requirements: not lower than the lower limit of the stable operation zone, and the output of the remaining switched units should meet the following requirements: greater than or equal to the grid-required switching threshold (Y2). 全厂i Let represent the minimum number of units in operation at time i, PN represent the maximum upper limit of the stable operating range for a single unit under the current head, and Y1 represent the lower limit of the stable operating range. Therefore, the following must be satisfied:

[0105] T 全厂 i =ROUNDUP(P 全厂 i / PN, 0);

[0106] PN*T 全厂 i ≥P 全厂 i ≥Y1*2+(T 全厂 i -2)*Y2(i=1...96).

[0107] S1.6 Verification of the connection between the daily power generation plan and the previous day's power generation plan. P 全厂 0 This represents the planned value for the entire plant at the last output point of the previous day. This value can be automatically read from the previous day's power generation plan data for the last point.

[0108] The connection between the first point's plan and the 0 point should meet requirements such as no sudden changes in the power generation plan and rolling hourly fluctuations. Therefore, the following must be satisfied:

[0109] | P 全厂 1 -P 全厂 0 | ≤X3 / 4.

[0110] If any step in S1 fails the verification, an alarm will be triggered and the process will be exited.

[0111] S2. Production of daily power generation forecast for branch plant;

[0112] S2.1, Read the last planned value of the previous day's power generation plan. P 全厂 0 This represents the plant's total power generation plan at 24:00 the previous day; similarly, P... 分厂1 0 P 分厂2 0 These represent the branch plant's power generation plan at 24:00 the previous day. The corresponding number of generating units in operation is T. 分厂1 0 T 分厂2 0 T 全厂 0 These six values ​​can be automatically read from the data of the last point in the previous day's power generation plan.

[0113] S2.2 Calculation of Power Generation Plan Allocation. When the total plant power remains unchanged, the number of units in operation and the power output of each branch plant are maintained from the previous day. During periods of power change, it is necessary to first determine whether unit startup or shutdown is required, and the actual number of units in operation must meet the following requirement: not exceeding the number of available units. T 分厂 i T 分厂 max, T 分厂 N T 分厂 检修 These represent the number of generators in operation at time i in the power plant branch.

[0114] T 分厂 max=T 分厂 N -T 分厂 检修 ;

[0115] 0 < T 分厂 i ≤T 分厂 max;

[0116] The power-up period, i.e., P 全厂 i <P 全厂 i+1 ;

[0117] No need to power on, T is satisfied. 全厂 i =ROUNDUP(P 全厂 i / PN, 0 (PN represents the maximum upper limit of the stable zone of a single unit under the water head), T 全厂 i =T 全厂 i+1 When power is increased, it is preferentially allocated to the branch plant with lower power. After the power reserve of the branch plant is fully increased, the remaining power is allocated to another branch plant. Therefore, the following must be satisfied:

[0118] If: P 分厂1 i <P 分厂2 i ;

[0119] P 分厂旋备 i =T 分厂 i *PN-P 分厂 i ;

[0120] If P 全厂 i+1 -P 全厂 i ≤P 分厂1旋备 i Then P分厂1 i+1 =P 分厂1 i +(P) 全厂 i+1 -P 全厂 i );

[0121] T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 =P 分厂2 i ;T 分厂2 i+1 =T 分厂2 i .

[0122] If P 全厂 i+1 -P 全厂 i >P 分厂1旋备 i Then P 分厂1 i+1 =P 分厂1 i +P 分厂1旋备 i ;T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;T 分厂2 i+1 =T 分厂2 i .

[0123] If P 分厂2 i ≥P 分厂1 i Similarly, P can be calculated. 分厂2 i+1 T 分厂2 i+1 P 分厂1 i+1 T 分厂1 i+1 .

[0124] The device needs to be powered on. 全厂i+1 >T 全厂 i Due to hourly fluctuation limitations, the number of units that can be added to the system at any given time cannot exceed one. Therefore, T 全厂 i+1 =T 全厂 i +1, additional generating units should be prioritized in branch plants with a larger number of standby units. Therefore, the following conditions must be met:

[0125] If there are more standby units in Branch Plant 1, then additional units in Branch Plant 1 will be activated, i.e., if T 分厂1 max-T 分厂1 i ≥T 分厂2 max-T 分厂2 i So T 分厂1 i+1 =T 分厂1 i +1, T 分厂2 i+1 =T 分厂2 i Meanwhile, each branch plant's plan must meet the following requirements: unit vibration zone and shutdown requirements. Therefore, the following must be met:

[0126] T 分厂1 i+1 *PN≥P 分厂1 i+1 ≥(Y1+(T 分厂1 i+1 -1) *Y2);

[0127] P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;

[0128] T 分厂2 i+1 *PN≥P 分厂2 i+1 ≥(Y1+(T 分厂2 i+1 -1) *Y2).

[0129] If there are more standby units in Branch Plant 2, then additional units in Branch Plant 2 will be started. That is, if T 分厂1 max-T 分厂1 i <T 分厂2 max-T 分厂2 i So T 分厂2 i+1 =T 分厂2 i +1, T分厂1 i+1 =T 分厂1 i Meanwhile, each branch plant's plans must meet the following requirements: unit vibration zone and shutdown requirements. Therefore, the following must be met:

[0130] T 分厂2 i+1 *PN≥P 分厂2 i+1 ≥(Y1+(T 分厂2 i+1 -1) *Y2);

[0131] P 分厂1 i+1 =P 全厂 i+1 -P 分厂2 i+1 ;

[0132] T 分厂1 i+1 *PN≥P 分厂1 i+1 ≥(Y1+(T 分厂1 i+1 -1) *Y2).

[0133] During the power reduction period, i.e., P 全厂 i >P 全厂 i+1 ,

[0134] No downtime required. 全厂 i+1 ≥(Y1+(T 全厂 i+1 -1) *Y2), T 全厂 i+1 =T 全厂 i When reducing the power of a branch plant with a large power output, and if no adjustable power output can be reduced, the remaining reduction amount will be allocated to another branch plant. Therefore, the following must be satisfied:

[0135] P 分厂可调 i =P 分厂 i -(Y1+(T 分厂1 i -1) *Y2);

[0136] If: P 分厂1 i ≥P 分厂2 i ;

[0137] If P 全厂 i+1 -P全厂 i ≤P 分厂1可调容量 i Then P 分厂1 i+1 =P 分厂1 i -(P 全厂 i+1 -P 全厂 i ); T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 =P 分厂2 i ;T 分厂2 i+1 =T 分厂2 i .

[0138] If P 全厂 i+1 -P 全厂 i >P 分厂1可调容量 i Then P 分厂1 i+1 =P 分厂1 i -P 分厂1可调容量 i ;T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;T 分厂2 i+1 =T 分厂2 i .

[0139] If P 分厂2 i >P 分厂1 i Similarly, P can be calculated. 分厂2 i+1 T 分厂2 i+1 P 分厂1 i+1 T 分厂1 i+1 .

[0140] The system needs to be shut down. 全厂 i+1 < (Y1+ (T) 全厂 i+1 -1) *Y2), T 全厂 i+1 =T 全厂 i -1.

[0141] If the number of units in Plant 1 is high, then the units in Plant 1 should be shut down first. If T 分厂1 i ≥T 分厂2 i If one machine is parked on the left bank, then the following condition is met:

[0142] T 分厂1 i+1 =T 分厂1 i -1;

[0143] T 分厂2 i+1 =T 分厂2 i ;

[0144] (Y1+(T) 分厂1 i+1 -1) * Y2) ≤ P 分厂1 i+1 ≤T 分厂1 i+1 *PN;

[0145] P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;

[0146] (Y1+(T) 分厂2 i+1 -1) * Y2) ≤ P 分厂2 i+1 ≤P 分厂2 i+1 *PN.

[0147] If the number of units in branch plant 2 is high, then the units in branch plant 2 will be shut down first. If T 分厂1 i <T 分厂2 i If one aircraft is parked on the right bank, then the following condition is met:

[0148] T 分厂2 i+1 =T 分厂2 i -1;

[0149] T 分厂1 i+1 =T 分厂1 i ;

[0150] (Y1+(T) 分厂2 i+1 -1) * Y2) ≤ P 分厂2 i+1 ≤T 分厂2 i+1 *PN;

[0151] P 分厂1 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;

[0152] (Y1+(T) 分厂1 i+1 -1) * Y2) ≤ P 分厂1 i+1 ≤P 分厂1 i+1 *PN.

[0153] (3) The period of average power, i.e., P 全厂 i =P 全厂 i+1 Then P 分厂1 i+1 =P 分厂1 i ;P 分厂2 i+1 =P 分厂2 i ;T 分厂1 i+1 =T 分厂1 i ;T 分厂2 i+1 =T 分厂2 i .

[0154] S3. Verify the safety of the branch plant's daily power generation plan and generate a suggested power generation plan.

[0155] S3.1, Branch Plant Power Generation Plan and DC Matching Verification. According to relevant regulations, the proportion of electricity transmitted to other provinces and retained during the flood and dry seasons differs for hydropower stations, especially point-to-grid hydropower stations. During the flood season, all electricity is transmitted to other provinces, while during the dry season, there is a C1 / C2 ratio between electricity transmitted to other provinces and electricity transmitted to other provinces. Therefore, the following must be satisfied:

[0156] During the flood season, P 全厂 i =P 直流 i ;

[0157] Dry season, P 全厂 i / P 直流 i = (C1 + C2) / C2;

[0158] The "Stability Control Regulations" stipulate that there is a certain matching relationship between DC transmission power and the output of a single plant; therefore, the following must be met:

[0159] P 直流 i ≥P 分厂1 i +X5; and P 直流 i ≥P 分厂2 i +X5 (X5 is related to the number of DC converters in operation);

[0160] If the above conditions are met, a power generation plan will be generated directly. If not, a parameter needs to be manually adjusted and P needs to be recalculated following steps 2.1-2.2. 分厂1 i With P 分厂2 i， The final power generation plan for the branch plant is generated once all conditions are met.

[0161] Example 1:

[0162] The planned values ​​for all 96 points in the plant are shown in Table 1:

[0163] Table 1. Planned Values ​​for 96 Points Across the Plant

[0164]

[0165] The branch plant's schedule for the previous day's end-of-day plan is shown in Table 2.

[0166] Table 2. Previous Day's End-of-Day Planned Plant Schedule

[0167]

[0168] Given a general power generation plan for the entire plant, use this algorithm to verify and decompose it into power generation plans for individual plants.

[0169] Step S1: Conduct a safety check on the daily power generation plan of the entire hydropower station directly controlled by the national dispatch center.

[0170] Step 1.1 Check if the downstream water level meets the minimum navigation water level requirement: The output values ​​at all 96 points meet the P requirement. 全厂 i ≥X1; meets the requirements.

[0171] Step 1.2 Check whether the downstream water level fluctuation meets the daily fluctuation requirements:

[0172] P 全厂max =max(P 全厂 1, P 全厂 i ..., P 全厂 96 (i=1...96);

[0173] P 全厂min =min(P) 全厂 1 ,P 全厂 i ..., P 全厂 96 (i=1...96);

[0174] P 全厂max -P 全厂min ≤X2;

[0175] Substitute into formula P 全厂max =4160, P 全厂min =2960, P 全厂max -P 全厂min =1200≤X2, which meets the requirements.

[0176] Step 1.3 Verification of hourly water level fluctuations downstream of the reservoir:

[0177] |△P hours| = |P 全厂 i -P 全厂 i+1 ∣+∣P 全厂 i+1 -P 全厂 i+2 ∣+∣P 全厂 i+2 -P 全厂 i+3 ∣+∣P 全厂 i+3 -P 全厂 i+4 | = 800 ≤ X3, which meets the requirements.

[0178] Step 1.4 Verification of the plant's overall power generation capacity:

[0179] Based on the current power plant maintenance status, unit head constraints, and line and DC maintenance status, the total power generation capacity X of the plant is determined. 4， P 全厂max =4160≤X 4， The requirements are met.

[0180] Step 1.5 Safety and stability verification of the entire plant's power generation plan:

[0181] The lower limit of the stable operating range is Y1, and the machine switching threshold is Y2. The 96-point value is calculated using formula T. 全厂 i =ROUNDUP(P 全厂 i / PN, 0); calculate the number of machines T started at each point. 全厂 i ;PN*T 全厂 i ≥P 全厂 i ≥Y1*2+(T 全厂 i -2)*Y2(i=1...96); all points can meet the requirements.

[0182] Step 1.6 Verify the connection between the planned power generation on the 6th and the previous day's planned power generation;

[0183] P 全厂 0 The last planned point value of the previous day's power generation plan was 3160, P. 全厂 1 The first planned point value for the day is 2960.

[0184] | P 全厂 1 -P 全厂 0 | =200≤X3 / 4, which meets the requirement.

[0185] After meeting the initial verification requirements, the process proceeds to the next step: creating the daily power generation plan for the branch plant.

[0186] Step S2: Prepare the daily power generation forecast for the branch plant of the nationally dispatched hydropower station.

[0187] Step 2.1 Read the last planned value and number of generators to be started from the previous day's power generation plan.

[0188] P 全厂 0 =3160, P 分厂1 0 =1280, P 分厂2 0 =1880, and the number of machines started (T) 分厂1 0 =2,T 分厂2 0 =3.

[0189] Step 2.2 Power Generation Plan Allocation Calculation:

[0190] Start-up and shutdown determination.

[0191] 00:00-00:15P 全厂 0 > P 全厂 1 For the load reduction period, use formula T again. 全厂 1 =ROUNDUP(P 全厂 21 / PN,0)=4<T 全厂 0 =5 indicates that one unit needs to be shut down. The formula is then used to further select the branch plant to be shut down, T. 分厂1 0 <T 分厂2 0 Plant 2 has more generating units in operation, therefore the units at Plant 2 will be shut down. Therefore, T 分厂1 1 =2,

[0192] T 分厂2 1 =3-1=2; Calculate the power of branch plant 2 after shutdown using the formula (Y1+(T)). 分厂1 i+1 -1) * Y2) ≤ P 分厂1 i+1 ≤T 分厂1 i+1 *PN, take one of the values ​​to calculate, P 分厂2 1 =1480, P 分厂1 1 =2960-1480=1480;

[0193] 00:15-6:00P 全厂 i+1 = P 全厂 i For the period of average power, use the formula P 全厂 i =P 全厂 i+1 Then P 分厂1 i+1 =P 分厂1 i ;P 分厂2 i+1 =P 分厂2 i ;T 分厂1 i+1 =T 分厂1 i ;T 分厂2 i+1 =T 分厂2 i The calculation results show that the plant load and the number of machines in operation remain unchanged between 00:15 and 6:00.

[0194] 6:15-7:30P 全厂 i+1 > P 全厂 i During the power-up period, a formula is used to determine whether the machine needs to be turned on:

[0195] P 全厂 25 =3160, calculate T 全厂 25 =ROUNDUP(P 全厂 25 / PN,0)=5>T 全厂 24 =4, one more unit needs to be added;

[0196] Calculate the plant allocation of load increments, and substitute the values ​​into the judgment formula to obtain P. 分厂1 24 =P 分厂2 24 Both branch plants have the same standby unit; branch plant 1 will be randomly selected to start up. 分厂1 25 =T 分厂1 524 +1=3, T 分厂2 25 =T 分厂2 24 T 分厂1 i+1 *PN≥P 分厂1 i+1 ≥(Y1+(T 分厂1 i+1 -1) *Y2) Calculate P using the formula and specific parameters. 分厂1 25 The range of values ​​for P can be selected, and 1780 can be chosen from among them, thus P 分厂2 25 =3160-1780=1380;

[0197] P 全厂 26 =3360, calculate T 全厂 26 =ROUNDUP(P 全厂 25 / PN, 0) = 5, no power-on required;

[0198] P 全厂 26 -P 全厂 25 ≤P 分厂1旋备 25 P 分厂1 26 =P分厂1 25 +(P) 全厂 i+1 -P 全厂 i )=1780+(3360-3160)=1980;T 分厂1 26 =3;P 分厂2 26 =P 全厂 26 -P 分厂1 26 =1380; T 分厂2 26 =2;

[0199] P 全厂 27 =3560, calculate T 全厂 26 =ROUNDUP(P 全厂 25 / PN, 0) = 5, no power-on required; similarly calculate P. 分厂1 27 =P 分厂1 26 +(P) 全厂 27 -P 全厂 26 )=1980+(3560-3360)=2180;T 分厂1 27 =3;P 分厂2 27 =P 全厂 27 -P 分厂1 27 =1380; T 分厂2 26 =2;

[0200] P 全厂 28 =3760, calculate T 全厂 28 =ROUNDUP(P 全厂 28 / PN,0)=6>T 全厂 27 =5, the device needs to be turned on;

[0201] T 分厂1 max-T 分厂1 27 <T 分厂2 max-T 分厂2 27 Therefore, two additional generating units were added to the branch plant, namely T. 分厂228 =T 分厂2 27 +1=3, T 分厂2 28 *PN≥P 分厂2 28 ≥(Y1+(T 分厂2 28 -1) *Y2), select one value from the answer value group to calculate P. 分厂2 28 =1780, P 分厂1 28 =3760-1780=1980, T 分厂1 28 =T 分厂1 27 =3;

[0202] P 全厂 29 =3960, calculate T 全厂 29 =ROUNDUP(P 全厂 29 / PN, 0) = 6, no power-on required. Based on the formula P for not requiring power-on... 分厂1 i ≥P 分厂2 i Okay, P 分厂2 29 =P 分厂2 28 +(P) 全厂 29 -P 全厂 28 )=1780+(3560-3360)=1980, ;P 分厂1 29 =P 全厂 29 -P 分厂1 29 =3960-1980=1980, T 分厂2 29 =3,T 分厂1 29 =3;

[0203] P 全厂 30 =4160, calculate T 全厂 30 =ROUNDUP(P 全厂 30 / PN, 0) = 6, no power-on required. Similarly, P 分厂2 30 =2180, P 分厂1 30=1980, T 分厂2 30 =3,T 分厂1 30 =3;

[0204] 7:30-11:30P 全厂 i =P 全厂 i+1 If the calculation is performed during the flat load period, then P 分厂1 i+1 =P 分厂1 i ;P 分厂2 i+1 =P 分厂2 i ;T 分厂1 i+1 =T 分厂1 i ;T 分厂2 i+1 =T 分厂2 i .

[0205] 11:30-11:45 P 全厂 i >P 全厂 i+1 During the load reduction period, T 全厂 43 =ROUNDUP(P 全厂 43 / PN, 0) = 6, no shutdown required, P 分厂1 43 <P 分厂2 43 P 全厂 43 =3760, P 分厂2 43 =P 分厂2 42 -|P 全厂 43 -P 全厂 42 |=2180-|3760+4160|=1780, T 分厂1 i+1 =T 分厂1 i P 分厂1 43 =P 全厂 43 -P 分厂2 42 =3760-1780=1980, T 分厂2 43 =3,T 分厂143 =3;

[0206] 11:45-14:45P 全厂 i =P 全厂 i+1 If the calculation is performed during the flat load period, then P 分厂1 i+1 =P 分厂1 i P 分厂2 i+1 =P 分厂2 i T 分厂1 i+1 =T 分厂1 i T 分厂2 i+1 =T 分厂2 i .

[0207] 14:45-15:00P 全厂 i <P 全厂 i+1 During the power-up period, a formula is used to determine whether the machine needs to be turned on:

[0208] P 全厂 60 =4160, calculate T 全厂 60 =ROUNDUP(P 全厂 60 / PN,0)=6=T 全厂 60 No additional generating units are needed; P 分厂1 60 <P 分厂2 60 P 分厂2 60 =P 分厂2 59 +(P) 全厂 60 -P 全厂 59 )=1780+(4160-3760)=2180, T 分厂1 i+1 =T 分厂1 i P 分厂1 60 =P 全厂 60 -P 分厂2 60 =4160-2180=1980, T 分厂2 60 =3,T分厂1 60 =3,

[0209] 15:00-22:00P 全厂 i =P 全厂 i+1 If the calculation is performed during the flat load period, then P 分厂1 i+1 =P 分厂1 i P 分厂2 i+1 =P 分厂2 i T 分厂1 i+1 =T 分厂1 i T 分厂2 i+1 =T 分厂2 i .

[0210] 22:00-24:00 P 全厂 i >P 全厂 i+1 During the period of load reduction,

[0211] 22:15 P 全厂 89 =3960,T 全厂 89 =ROUNDUP(P 全厂 89 / PN,0)=6=T 全厂 89 No downtime required.

[0212] P 分厂1 88 <P 分厂2 88 P 分厂2 89 =P 分厂2 88 -|P 全厂 89 -P 全厂 88 |=2180-(4160-3960)=1980,T 分厂1 i+1 =T 分厂1 i P 分厂1 89 =P 全厂 89 -P 分厂2 89 =3960-1980=1980, T分厂2 89 =3,T 分厂1 89 =3,

[0213] 22:30P 全厂 90 =3760,T 全厂 90 =ROUNDUP(P 全厂 90 / PN,0)=6=T 全厂 90 No downtime required.

[0214] P 分厂1 89 =P 分厂2 89 P 分厂1 90 =P 分厂1 89 -|P 全厂 90 -P 全厂 89 |=1980-(3960-3760)=1780,T 分厂2 i+1 =T 分厂2 i P 分厂2 90 =P 全厂 90 -P 分厂1 90 =3760-1780=1980, T 分厂2 90 =3,T 分厂1 90 =3,

[0215] 22:45P 全厂 91 =3560,T 全厂 91 =ROUNDUP(P 全厂 91 / PN,0)=5=T 全厂 90 -1, 1 machine needs to be shut down, T 分厂2 90 =T 分厂1 90 Using formula T 分厂1 i+1 =T 分厂1 i -1; T 分厂2 i+1 =T 分厂2i ; (Y1+(T) 分厂1 i+1 -1) * Y2) ≤ P 分厂1 i+1 ≤T 分厂1 i+1 *PN;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ; (Y1+(T) 分厂2 i+1 -1) * Y2) ≤ P 分厂2 i+1 ≤P 分厂2 i+1 *PN; T is calculated. 分厂1 91 =3-1=2, P 分厂1 91 =1380, P 分厂2 91 =3560-1380=2180, T 分厂2 91 =3;

[0216] 23:00P 全厂 92 =3360, T 全厂 92 =ROUNDUP(P 全厂 92 / PN, 0) = 5, no shutdown required, P 分厂1 91 <P 分厂2 91 Reduce the power output of Plant 2. 分厂2 92 =P 分厂2 91 -|P 全厂 92 -P 全厂 91 |=2180-|3560-3360|=1980, P 分厂1 92 =3360-1980=1380, T 分厂1 92 =2,T 分厂2 92 =3;

[0217] 23:15P 全厂 93 =3160, T 全厂 93 =ROUNDUP(P 全厂93 / PN, 0) = 5, no shutdown required, P 分厂1 92 <P 分厂2 92 Reduce the power output of Plant 2. 分厂2 93 =P 分厂2 92 -|P 全厂 93 -P 全厂 92 |=1980-|3560-3360|=1780, P 分厂1 93 =3160-1780=1380, T 分厂1 93 =2,T 分厂2 93 =3;

[0218] 23:15-24:00P 全厂 i =P 全厂 i+1 If the calculation is performed during the flat load period, then P 分厂1 i+1 =P 分厂1 i P 分厂2 i+1 =P 分厂2 i T 分厂1 i+1 =T 分厂1 i T 分厂2 i+1 =T 分厂2 i .

[0219] The preliminary power generation plan is shown in Table 3.

[0220] Table 3 shows the preliminary power generation plan.

[0221]

[0222] S3. Safety verification of the branch plant's daily power generation plan and generation of a suggested power generation plan:

[0223] S3.1, Branch plant power generation plan and DC matching verification.

[0224] Flood season: P 全厂 i =P 直流 i ;

[0225] Dry season, P 全厂i / P 直流 i = (C1 + C2) / C2;

[0226] P 直流 i ≥P 分厂1 i +X5; and P 直流 i ≥P 分厂2 i +X5;

[0227] After verification, the requirements were met, and a formal branch factory plan was generated.

[0228] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A calculation method for preparing daily power generation forecasts for hydropower stations directly regulated by the national dispatch center, characterized in that... Includes the following steps: Step S1: Conduct a safety check on the daily power generation plan of the entire hydropower station directly controlled by the national dispatch center; Step S2: Prepare the daily power generation forecast for the branch plant of the hydropower station directly dispatched by the national dispatch center; Step S3: Conduct a safety check on the daily power generation plan of the branch plant of the national direct-dispatch hydropower station and generate a suggested power generation plan; The sub-steps of step S2 are: S2.1, Read the last planned value of the previous day's power generation plan; P 全厂 0 P represents the plant's total power generation plan as of 24:00 the previous day. 分厂1 0 P 分厂2 0 These represent the branch plant's power generation plan at 24:00 the previous day; the corresponding number of generating units in operation for the two branch plants and the entire plant is T. 分厂1 0 T 分厂2 0 ; S2.2 Calculation of power generation plan allocation; When the total power of the plant remains unchanged, the number of units started and the power of the branch plant are maintained as of the previous day. During periods of power change, it is necessary to first determine whether to start or stop the units, and the actual number of units started must meet the requirement of not exceeding the number of available units. T 分厂 i T 分厂 max, T 分厂 N T 分厂 检修 These represent the number of generators in operation at time i in the power plant branch; T 分厂 max=T 分厂 N -T 分厂 检修 ; 0<T 分厂 i ≤T 分厂 max; (1) Power-up period, i.e. P 全厂 i <P 全厂 i+1 ; 1) No power-on is required, thus satisfying T. 全厂 i =ROUNDUP(P 全厂 i / PN, 0), PN represents the upper limit of the stable zone of a single unit under the water head, T 全厂 i =T 全厂 i+1 When power is increased, it is preferentially allocated to the branch plant with lower power. After the power reserve of the branch plant is fully increased, the remaining power is allocated to another branch plant. Therefore, it is necessary to meet the following requirements: If: P 分厂1 i <P 分厂2 i ; P 分厂旋备 i =T 分厂 i PN-P 分厂 i ; If P 全厂 i+1 -P 全厂 i ≤P 分厂1旋备 i Then P 分厂1 i+1 =P 分厂1 i +(P) 全厂 i+1 -P 全厂 i ); T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 =P 分厂2 i ; T 分厂2 i+1 =T 分厂2 i ; If P 全厂 i+1 -P 全厂 i >P 分厂1旋备 i Then P 分厂1 i+1 =P 分厂1 i +P 分厂1旋备 i ; T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ; T 分厂2 i+1 =T 分厂2 i ; If P 分厂2 i ≥P 分厂1 i Similarly, P can be calculated. 分厂2 i+1 T 分厂2 i+1 P 分厂1 i+1 T 分厂1 i+1 ; 2) Requires powering on, T 全厂 i+1 >T 全厂 i Due to hourly fluctuation limitations, the number of units that can be added to the system at any given time cannot exceed one. Therefore, T 全厂 i+1 =T 全厂 i +1, additional generating units will be preferentially selected from plants with more standby units; therefore, this requirement must be met. A. If Branch Plant 1 has more standby units, then additional units from Branch Plant 1 will be activated. That is, if T 分厂1 max-T 分厂1 i ≥T 分厂2 max-T 分厂2 i , So T 分厂1 i+1 =T 分厂1 i +1, T 分厂2 i+1 =T 分厂2 i , At the same time, each branch plant's plans must meet the unit vibration zone and shutdown requirements; therefore, it is necessary to meet... T 分厂1 i+1 PN≥P 分厂1 i+1 ≥(Y1+(T 分厂1 i+1 -1) Y2); P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ; T 分厂2 i+1 PN≥P 分厂2 i+1 ≥(Y1+(T 分厂2 i+1 -1) Y2); B. If Branch Plant 2 has more standby units, then Branch Plant 2 units will be added, i.e., if T 分厂1 max-T 分厂1 i <T 分厂2 max-T 分厂2 i So T 分厂2 i+1 =T 分厂2 i +1, T 分厂1 i+1 =T 分厂1 i ; At the same time, each branch plant's plans must meet the unit vibration zone and shutdown requirements; therefore, the following must be met: T 分厂2 i+1 PN≥P 分厂2 i+1 ≥(Y1+(T 分厂2 i+1 -1) Y2); P 分厂1 i+1 =P 全厂 i+1 -P 分厂2 i+1 ; T 分厂1 i+1 PN≥P 分厂1 i+1 ≥(Y1+(T 分厂1 i+1 -1) Y2)。 2. The calculation method for preparing the daily power generation forecast of a nationally dispatched hydropower station according to claim 1, characterized in that: The sub-steps of step S1 are: S1.1 Verification of the minimum navigable water level downstream of the reservoir: For the entire plant's 96-point power generation plan, the power generation flow rate corresponding to each output point must meet the minimum discharge flow rate requirement of the reservoir. 全厂 i This represents the plant's 96-point power generation plan, where X1 represents the power output corresponding to the minimum discharge flow at each reservoir water level, and P... 全厂 i X1 and X1 satisfy the following relationship: P 全厂 i ≥X 1； In the formula, i = 1, 2...96, and 96 time points are recorded every 15 minutes from 00:15 to 24:00 each day; S1.2, Daily variation of downstream reservoir water level verification: The difference in power generation flow rate corresponding to the maximum and minimum output in the plant's 96-point power generation plan must meet the daily variation requirement of the downstream reservoir water level. 全厂max To maximize output throughout the day; P 全厂min X2 represents the minimum output for the entire day; X2 represents the output difference required to meet the daily fluctuation of the downstream water level of the reservoir; P 全厂max P 全厂min X2 satisfies the following relationship: P 全厂max =max(P 全厂 1, P 全厂 i ,……,P 全厂 96 ); P 全厂min =min(P 全厂 1 ,P 全厂 i ,……,P 全厂 96 ); P 全厂max -P 全厂min ≤X2; S1.3, Hourly Variation Verification of Downstream Reservoir Water Level: For the plant's 96-point power generation plan, the hourly peak shaving amount, rolled with a 15-minute precision, must correspond to changes in the reservoir's power generation flow rate that meet the hourly variation requirements of the downstream reservoir water level; △P hour represents the hourly peak shaving amount rolled with a 15-minute precision; X3 represents the output difference corresponding to meeting the hourly variation requirements of the downstream reservoir water level; △P satisfies the following relationship: |△P hours| = |P 全厂 i -P 全厂 i+1 ∣+∣P 全厂 i+1 -P 全厂 i+2 ∣+∣P 全厂 i+2 -P 全厂 i+3 ∣+∣P 全厂 i+3 -P 全厂 i+4 |≤X3; To prevent a sharp rise in downstream water levels, a single-point increase rate is also set, which must simultaneously satisfy the following relationship: ∣P 全厂 i -P 全厂 i+1 ∣≤X3 / 4; S1.4 Verification of Plant-wide Power Generation Capacity: The maximum power generation capacity of the entire plant is affected by head, unit maintenance, line maintenance, and DC maintenance. The maximum output during the plant's power generation plan should not exceed the maximum power generation capacity of the entire plant. The maximum power generation capacity X4 of the entire plant is a calculated value X4 that comprehensively considers the output constraints of head, maintenance, and operating mode. X4 satisfies the following relationship: P 全厂max ≤X 4； S1.5, Safety and Stability Verification of the Plant's Power Generation Plan: The start-up arrangement of the plant's 96 power generation plans must meet the minimum output requirements for the units to be switched on and off within the grid stability control regulations, as well as the stable operating requirements: Of the operating units in the plant, one unit in each branch plant of the power station must not be switched on, and the remaining units must be switched on and off; the output of the operating units must meet the stable operating requirements; when arranging the actual output, it should be considered that the output of the units not switched on and off must meet the requirement of not being lower than the lower limit of the stable operating zone, and the output of the remaining units to be switched on and off must meet the switching threshold value Y2 required by the grid. T 全厂 i Y1 represents the minimum number of units in operation at time i, PN represents the maximum upper limit of the stable operating range for a single unit under the current head, and Y1 represents the lower limit of the stable operating range. 全厂 i The following relationship must be satisfied: T 全厂 i =ROUNDUP(P 全厂 i / PN,0); PN T 全厂 i ≥P 全厂 i ≥Y1 2+(T 全厂 i -2) Y2; S1.6 Verification of the connection between the daily power generation plan and the previous day's power generation plan; P 全厂 0 P represents the plant-wide planned value for the last output point of the previous day; 全厂 0 It can automatically read the value of the last point from the previous day's power generation plan data; The connection between the first point's plan and the 0 point should ensure that the power generation plan does not change abruptly and meets the rolling hourly variation requirements; P 全厂 1 P 全厂 0 The following relationship must be satisfied: | P 全厂 1 -P 全厂 0 | ≤X3 / 4。 3. The calculation method for preparing the daily power generation forecast of a nationally dispatched hydropower station according to claim 2, characterized in that: If any step in steps S1.1-S1.6 fails the verification, an alarm will be triggered and the process will be exited.

4. The calculation method for preparing the daily power generation forecast of a nationally dispatched hydropower station according to claim 3, characterized in that: S2.2 also includes: (2) Power reduction period, i.e. P 全厂 i >P 全厂 i+1 , A. No downtime required; P 全厂 i+1 ≥(Y1+(T 全厂 i+1 -1) Y2), T 全厂 i+1 =T 全厂 i When reducing the power of a branch plant with a large power output, and if no adjustable power output is available, the remaining reduction amount will be allocated to another branch plant; therefore, it is necessary to meet the following requirements. P 分厂可调 i =P 分厂 i -(Y1+(T 分厂1 i -1) Y2); If: P 分厂1 i ≥P 分厂2 i ; If P 全厂 i+1 -P 全厂 i ≤P 分厂1可调容量 i Then P 分厂1 i+1 =P 分厂1 i +(P) 全厂 i+1 -P 全厂 i ); T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 =P 分厂2 i ;T 分厂2 i+1 =T 分厂2 i ; If P 全厂 i+1 -P 全厂 i >P 分厂1可调容量 i Then P 分厂1 i+1 =P 分厂1 i +P 分厂1可调容量 i ;T 分厂1 i+1 =T 分厂1 i ;P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 ;T 分厂2 i+1 =T 分厂2 i ; If P 分厂2 i >P 分厂1 i Similarly, P can be calculated. 分厂2 i+1 T 分厂2 i+1 P 分厂1 i+1 T 分厂1 i+1 ; B. Shutdown is required; P 全厂 i+1 < (Y1+ (T) 全厂 i+1 -1) Y2), T 全厂 i+1 =T 全厂 i -1; C. If the number of units in Branch Plant 1 is high, then the units in Branch Plant 1 should be shut down first. If T 分厂1 i ≥T 分厂2 i If one machine is parked on the left bank, then the condition is met. T 分厂1 i+1 =T 分厂1 i -1; T 分厂2 i+1 =T 分厂2 i ; (Y1+(T 分厂1 i+1 -1) Y2)≤P 分厂1 i+1 ≤T 分厂1 i+1 PN; P 分厂2 i+1 =P 全厂 i+1 -P 分厂1 i+1 (Y1+(T 分厂2 i+1 -1) Y2)≤P 分厂2 i+1 ≤P 分厂2 i+1 PN; D. If the number of units in Branch Plant 2 is high, then the units in Branch Plant 2 should be shut down first. If T 分厂1 i <T 分厂2 i If one aircraft is parked on the right bank, then the following condition is met: T 分厂2 i+1 =T 分厂2 i -1; T 分厂1 i+1 =T 分厂1 i ; (Y1+(T 分厂2 i+1 -1) Y2)≤P 分厂2 i+1 ≤T 分厂2 i+1 PN; P 分厂1 i+1 =P 全厂 i+1 -P 分厂1 i+1 (Y1+(T 分厂1 i+1 -1) Y2)≤P 分厂1 i+1 ≤P 分厂1 i+1 PN; (3) The period of average power, i.e. P 全厂 i =P 全厂 i+1 Then P 分厂1 i+1 =P 分厂1 i ;P 分厂2 i+1 =P 分厂2 i ;T 分厂1 i+1 =T 分厂1 i ;T 分厂2 i+1 =T 分厂2 i .

5. The calculation method for preparing the daily power generation forecast of a nationally dispatched hydropower station according to claim 1, characterized in that: The decomposition steps of step S3 are as follows: S3.1, Branch plant power generation plan and DC matching verification; Point-to-grid hydropower stations must meet the following requirements: During the flood season, P 全厂 i =P 直流 i ; Dry season, P 全厂 i / P 直流 i = (C1 + C2) / C2; The regulations stipulate that there is a certain matching relationship between the DC transmission power and the output of a single plant; therefore, the following must be met: P 直流 i ≥P 分厂1 i +X5; and P 直流 i ≥P 分厂2 i +X5, where X5 is related to the number of DC converters in operation; If the above conditions are met, a power generation plan will be generated directly. If not, a parameter needs to be manually adjusted and P needs to be recalculated according to steps 2.1-2.

2. 分厂1 i With P 分厂2 i， The final power generation plan for the branch plant is generated once all conditions are met.

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