Hydroelectric generating set automatic power generation control method, automatic power generation control system and computer storage medium

Abstract

The invention relates to the technical field of power system automation, and discloses a hydroelectric generating set automatic power generation control method, an automatic power generation control system and a computer storage medium, and the method comprises the steps: determining an operable interval of each set according to a vibration region of each set of a hydropower station and an output range of each set, obtaining a total output range under each permutation and combination through permutation and combination, and screening out all permutation and combinations meeting the target output of the hydropower station; determining the number of times that each unit needs to cross the vibration area under each permutation combination which is adjusted to meet the target load by utilizing the current output of each unit of the hydropower station, and selecting the operable interval of each unit under the permutation combination which needs to cross the vibration area and has the least total number of times as the target operable interval of each unit; and determining the target output of each unit according to the target operation interval of each unit, and controlling each unit according to the target output. The automatic power generation control method provided by the invention realizes simultaneous, efficient and accurate regulation and control of a plurality of units.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automation, and in particular to an automatic power generation control method for a hydroelectric generator set, an automatic power generation control system and a computer storage medium. Background Art

[0002] Automatic Generation Control (AGC) of a hydropower station is a commonly used automatic generation control method for the entire hydropower station in the prior art. This method tracks and controls the load changes of the power system by controlling the active output of the hydropower station units to maintain the output frequency of the hydropower units equal to the rated value and maintain the stability of the load of the power system. The hydropower station AGC is an important part of the overall AGC system and plays an important role in the safety, stability and economic operation of the overall AGC system. By using the hydropower station AGC, the active power of the hydropower station can be automatically controlled quickly and at low cost to meet the needs of the power system in real time, realizing automatic power generation of the entire hydropower station.

[0003] In the new power system, in order to increase the consumption of new energy such as wind and light as much as possible and suppress its volatility, the operation mode of the hydropower station has changed from the previous base load operation mode to the stable grid operation mode. The change of the hydropower operation mode will have an adverse impact on the economic benefits of the hydropower station. Under the stable grid operation mode, the proportion of shutdown or low-load power generation of hydropower units increases, the number of starts and stops increases significantly, and the proportion of optimal efficiency power generation decreases significantly, resulting in an increase in the operation and maintenance costs of hydropower units and a decrease in power generation, and a decrease in the economic benefits of the hydropower station. At the same time, due to the relatively unstable power generation of wind and solar energy, there is a situation where the power generation surges or decreases sharply in a short period of time. Under the stable grid operation mode, the hydropower station has a significant increase in the demand for hydropower station unit regulation, and the number of start-up and shutdown and load regulation operations of the hydropower unit will increase; frequent operating condition conversion will increase the wear and loss of the unit, shorten the service life of important power station components such as turbines, increase downtime and operation and maintenance costs, and affect the safe operation of the unit.

[0004] In addition, during the operation of a hydropower station, there will generally be one or more vibration zones under a specific water head. When the generator output is within the vibration zone, the vibration of the turbine will increase significantly, the power generation efficiency will decrease, and even the safe operation of the generator set will be affected. Therefore, during the process of multiple commissioning of the hydropower station in order to maintain the stability of the power grid, it is necessary to try to avoid the unit from operating in the vibration zone and reduce the number of times the unit passes through the vibration zone.

[0005] In the prior art, in order to avoid equipment damage caused by the unit operating in the vibration area, a load regulation method considering the vibration area of the unit has been proposed. For example, the patent application text with the publication number CN116826771A discloses a load regulation cooperation method for a large hydropower unit when crossing the vibration area. This method is based on avoiding the vibration area of the hydropower unit in the final working area when allocating the load value. It finds all possible combinations of the units operating in the normal operation area according to the output of each unit, obtains the adjustment range of all possible combinations, searches for the combination that can meet the current plant load target value, and selects the combination with the smallest cumulative adjustment amplitude as the adjustment target combination. Subsequently, the target load values of each unit are allocated in the way of equal capacity or equal margin ratio. Although this method ensures that the output of each unit is not in the vibration area after the adjustment, the unit may need to cross the vibration area multiple times during the adjustment process, increasing the operation risk of the unit. Summary of the Invention

[0006] The object of the present invention is to provide a method for automatic generation control of a hydropower unit, an automatic generation control system and a computer storage medium, so as to solve the problem in the prior art that the unit needs to cross the vibration area multiple times during the adjustment process, increasing the operation risk of the unit.

[0007] The present invention provides a method for automatic generation control of a hydropower unit to solve the above technical problems. The steps include:

[0008] Screen out the permutations and combinations of the operable intervals of each hydropower unit that meet the target output of the hydropower station;

[0009] Use the current output of each hydropower unit to determine the number of times each unit needs to cross the vibration area under each permutation and combination adjusted to meet the target output of the hydropower station, and select the operable intervals of each unit under the permutation and combination with the least total number of times of crossing the vibration area as the target operable intervals of each unit;

[0010] Determine the target output of each unit according to the target output of the hydropower station and the target operation intervals of each unit, and control each unit according to the target output.

[0011] Further, step 3) determines the target output of each unit according to the proportion of the range value of the target operable interval of the unit in the total sum of the range values of the target operable intervals of all units. The range value of the target operable interval is the difference between the maximum output value and the minimum output value of the target operable interval.

[0012] Further, the formula for calculating the target output of each unit is:

[0013]

[0014] Where P i is the target output of unit i, Pset is the target output of the hydropower station, P imin is the minimum output value of unit i in the target operable range, ΔP i is the range value of the target operable range of unit i.

[0015] Further, when there are at least two permutations and combinations with the least total number of times of crossing the vibration zone, calculate the power change values of each unit from the current output to the permutation and combination with the least total number of times, and select the permutation and combination with the smallest sum of the power change values of all units as the target operable range.

[0016] An automatic generation control system includes a regulating hydropower station AGC, which is used to communicate with the energy management system of the dispatching center to obtain the target output of the hydropower station, and the regulating hydropower station AGC is used to screen out the permutations and combinations that meet the target output of the hydropower station; the regulating hydropower station AGC also determines the number of times each unit needs to cross the vibration zone under each permutation and combination adjusted to meet the target output of the hydropower station by using the current output of each unit of the hydropower station, selects the operable range of each unit under the permutation and combination with the least total number of times of crossing the vibration zone as the target operable range of each unit, and calculates the target output of each unit according to the selected target operable range.

[0017] Further, the regulating hydropower station AGC determines the target output of each unit according to the proportion of the range value of the target operable range of the unit in the total sum of the range values of the target operable ranges of all units, and the range value of the target operable range is the difference between the maximum output value and the minimum output value of the target operable range.

[0018] Further, the formula for calculating the target output of each unit is:

[0019]

[0020] where, P i is the target output of unit i, P set is the target output of the hydropower station, P imin is the minimum output value of unit i in the target operable range, ΔP i is the range value of the target operable range of unit i.

[0021] Further, when there are at least two permutations and combinations with the least total number of times of crossing the vibration zone, the regulating hydropower station AGC calculates the power change values of each unit from the current output to the permutation and combination with the least total number of times, and selects the permutation and combination with the smallest sum of the power change values of all units as the target operable range.

[0022] A computer storage medium stores a computer program to implement the automatic generation control method of the hydropower unit as described above.

[0023] The beneficial effects of the present invention are as follows: As an improved invention, the present application screens out the permutations and combinations of the operable ranges of each unit of the hydropower station that meet the target output of the hydropower station, and selects the target permutation and combination according to the principle of the minimum number of times of crossing the vibration zone for the target output of the hydropower station. Subsequently, the target output of each unit is determined according to the target operating range of each unit, and each unit is controlled according to the target output. The present invention effectively reduces the number of times of crossing the vibration zone during the unit regulation process, reduces the operation risk of the hydropower station, and prolongs the service life of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the system of the present invention;

[0025] Figure 2 It is the flow characteristic curve of the hydro-generating unit;

[0026] Figure 3 It is the display interface of the software control part of the present invention;

[0027] Figure 4 It is the display interface of the software AGC curve of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following further describes the specific embodiments of the present invention with reference to the drawings.

[0029] The automatic generation control method for hydro-generating units proposed by the present invention selects the target permutation and combination according to the principle of the minimum number of times of crossing the vibration zone. On this basis, the target output of each unit is determined, and each unit is controlled according to the target output to realize the regulation of the hydropower station units.

[0030] Embodiment of the Automatic Generation Control Method for Hydro-Generating Units

[0031] The present invention proposes an automatic generation control method for hydro-generating units suitable for a new power system, which optimizes the incremental rate algorithms such as flow used in the existing hydropower station AGC to achieve the optimal load distribution of the units.

[0032] In the prior art, the theoretical basis of the incremental rate algorithms such as flow is as follows:

[0033] Such as Figure 2The flow characteristic curves of Unit I and Unit II are shown. The abscissa of the curve is the unit output, and the ordinate is the unit flow. Assuming that the load assigned to Unit I is N1 and the load assigned to Unit II is N2 in the initial state, the working points of the two units on their respective flow characteristic curves I and II are point a and point b respectively. If the load of Unit I increases, Unit II will reduce the corresponding load to ensure the power output balance of the hydropower station. Then, dN1 = -dN2. The increase in the flow of Unit I is expressed as dQ1, and the decrease in the flow of Unit II is expressed as dQ2. dQ = dQ1 + dQ2 < 0, which means that when the load distribution between the two units changes slightly and the load of the power station remains unchanged, the total working flow of the power station decreases. That is, it is beneficial to increase the load of Unit I and reduce the load of Unit II. Continuing to increase the load of Unit I to the working point c, correspondingly, to ensure the power output balance, Unit II will work at point d. At points c and d, the slopes of the tangents of the flow characteristic curves of the two units are equal, that is:

[0034]

[0035] Obviously, dQ = dQ1 + dQ2 = 0. If the load of Unit I is continued to be increased and the load of Unit II is reduced at this time, then:

[0036]

[0037] Then dQ = dQ1 + dQ2 > 0, that is, the total working flow of the hydropower station will increase, which is not conducive to the production of the power plant.

[0038] According to the Lagrange condition extreme value principle, construct the auxiliary function:

[0039] F = Q1(N1) + Q2(N2) + ··· + Q(N n ) + λ(N1 + N2 + ··· + N n -N)

[0040] The necessary condition for the conditional extreme value is that the partial derivatives with respect to each variable N1, N2, N n are 0, that is:

[0041]

[0042] In summary, the conclusion can be drawn that under a certain load, the condition for the minimum working flow of the hydropower station is that the flow rate incremental rate values of n units are equal, that is:

[0043] However, micro-increment rate algorithms such as flow rate have relatively high requirements for the accuracy of the unit flow rate characteristic curve. In practical applications, there are problems such as unqualified accuracy of the flow rate characteristic curve, resulting in relatively large calculation errors. At the same time, due to the relatively low stability of wind power and photovoltaic power, hydropower stations need to adjust the power generation in real time. However, the micro-increment rate algorithms such as flow rate have a large amount of calculation data and long calculation time, making it difficult to quickly and accurately calculate the target output of each unit. In addition, in actual operation, due to factors such as the vibration area of the unit, the micro-increment rate algorithms such as flow rate may also have no solution. Therefore, in actual engineering applications, when the micro-increment rate characteristics of the units are the same, the micro-increment rate algorithms such as flow rate can be simplified. The specific simplified method is as follows:

[0044] 1. Obtain all permutations and combinations that meet the target output of the hydropower station.

[0045] First, determine the operable range of each unit according to the vibration area of each unit of the hydropower station and the output range of each unit. Permute and combine the operable ranges of each unit of the hydropower station to obtain the total output range of the hydropower station under each permutation and combination. Screen out all permutations and combinations that meet the target output of the hydropower station according to the total output range.

[0046] Specifically, for the convenience of understanding, take a hydropower station with two units as an example. Among them, the vibration area of Unit 1 is 0 - 10 MW, and the vibration area of Unit 2 is 30 - 80 MW. The output range of both units is 0 - 90 MW. Then the operable single-unit areas are 0 - 0 MW, 10 - 30 MW, and 80 - 90 MW. These three intervals are numbered 1, 2, and 3 respectively.

[0047] The appearance of the 0 - 0 area here is because when the computer program processes, the area between the minimum output of the unit output range and the minimum limit value of the vibration area of the first unit is also regarded as an operable area. In actual operation, the minimum output of the unit output range can be changed to 10 MW. At this time, the output ranges of the two units avoid the vibration interval of Unit 1, and the 0 - 0 MW interval can be eliminated.

[0048] Then when the two units are combined, there will be nine different possibilities. If the three operable single-unit intervals are numbered 1 - 3, then the possible combinations are 11, 12, 13, 21, 22, 23, 31, 32, 33 (the units digit above represents the operable interval selected by Unit 2, and the tens digit represents the operable interval selected by Unit 1). Calculate the total output range of each permutation and combination as follows:

[0049] Table 1 Total output range of all permutations and combinations

[0050]

[0051] The Pmax in the above table is the maximum value of the total output range of this combined hydropower station; Pmin is the minimum value of the total output range of this combined hydropower station.

[0052] Subsequently, according to the given target output of the hydropower station, find the combination method that can meet the target load. In this embodiment, it is assumed that the given target output of the hydropower station is 90MW, then according to Table 1, the possible combinations are 13, 31, 23, 32, a total of four schemes.

[0053] 2. Find the permutation and combination with the least number of times to cross the vibration area as the target operable range.

[0054] When regulating the AGC of the hydropower station, it follows the principle of automatically avoiding the vibration area of the unit during the load distribution process, that is:

[0055] 1) First, ensure that the unit load does not cross the vibration area, and avoid the unit load from frequently crossing the vibration area;

[0056] 2) When it is necessary to cross the vibration area, avoid large fluctuations in the unit load, and take the minimum number of times of crossing the vibration area as the adjustment standard.

[0057] Complying with the above principles, it is necessary to calculate the number of times the unit in the hydropower station needs to cross the vibration area when adjusting from the current output to the permutation and combination that meets the target load, and select the permutation and combination with the minimum total number of times that all units cross the vibration area as the target operable range.

[0058] First, determine the operable area corresponding to the unit in the current permutation and combination, and calculate the total number of times that all units in the hydropower station need to cross the vibration area from the current operating range to each permutation and combination that meets the target load.

[0059] Suppose the initial set total output of the hydropower station is 110MW, the output of Unit 1 is 20MW, located in the operable range 2, and the output of Unit 2 is 90MW, located in the operable range 3. Then for the four schemes corresponding to the given target load of 90MW, the corresponding number of times of crossing the vibration area can be analyzed as follows in the table:

[0060] Table 2. Number of times Unit 2 crosses the vibration area

[0061] Scheme 13 combination 31 combination 23 combination 32 combination Initial interval of Unit 2 3 3 3 3 Adjusted interval of Unit 2 3 1 3 2 Number of crossings 0 2 0 1

[0062] Table 3. Number of times Unit 1 crosses the vibration area

[0063] Scheme 13 combination 31 combination 23 combination 32 combination Initial interval of Unit 1 2 2 2 2 Adjusted interval of Unit 1 1 3 2 3 Number of crossings 1 1 0 1

[0064] Add the number of times the two units cross the vibration area under different combinations to obtain the total number of times that the whole station needs to cross the vibration area when adjusting to different permutations and combinations that meet the target load, as shown in the following table:

[0065] Table 4. Total number of times the hydropower station crosses the vibration area

[0066] Scheme 13 combination 31 combination 23 combination 32 combination Total number of crossings in the whole plant 1 3 0 2

[0067] As can be seen from Table 4, when the 23 combination is selected, neither of the two units in the hydropower station needs to cross the vibration area. Therefore, the 23 combination should be selected as the target permutation combination.

[0068] When there are at least two permutation combinations that meet the target load and the minimum values of the total number of times they need to cross the vibration area are the same, calculate the power change values of the permutation combinations of each unit from the current output to the target output, and select the permutation combination with the smallest sum of the power change values of all units as the target operable range to calculate the target output of each unit.

[0069] 3. Determine the target output of each unit according to the target output of the hydropower station and the target operating range of each unit.

[0070] In order to reduce the amount of calculation data in practical applications, the present invention simplifies the incremental rate algorithm such as flow rate. After considering the factors of the vibration interval of the unit and selecting a suitable target operating range, when the incremental rate characteristics of the units are the same, the incremental rate algorithm such as flow rate can be simplified to an equal proportion distribution method according to the unit capacity.

[0071] When calculating the target output of each unit, subtract the minimum processing value of each unit corresponding to the target permutation combination from the target output to obtain the output to be distributed, and distribute the output to be distributed according to the proportion of the output range value of each unit in the target permutation combination in the total sum of the output range values of all motors.

[0072] Specifically, assume that the maximum output of a certain unit is 40MW and the vibration interval is 10 - 20MW. Then the unit is divided into 3 adjustment ranges, namely 0 - 10MW, 10 - 20MW, and 20 - 40MW. Among them, 0 - 10MW and 20 - 40MW are called the operable ranges. The calculation formula for the target output of this unit is as follows:

[0073]

[0074] Where: P i is the target output of unit i, P set is the target output of the hydropower station, P imin is the minimum output value of unit i in the target operable range, ΔP i is the difference between the maximum output value and the minimum output value of the target operable range of unit i. If unit i operates in the range of 20 - 40MW, then P imin = 20MW, ΔP i =(40 - 20)= 20MW.

[0075] Assume there are currently 3 hydropower generating units, and their generating powers are respectively denoted as P1, P2, and P3; the power characteristics of the 3 units are the same, and the maximum output of each of the 3 units is 40 MW, and the vibration range of the 3 units is 10 - 20 MW;

[0076] Calculation example 1: Assume the current output of each of the 3 units is 25 MW, that is, P1 = P2 = P3 = 25 MW, and the current total output of the 3 units is P1 + P2 + P3 = 75 MW; if it is necessary to increase the target load of the 3 units to 90 MW, that is, Pset = 90 MW, then the calculation method for the output values of the 3 units after adjustment is as follows:

[0077] P1 = (90 - (20 + 20 + 20)) * ((40 - 20) / ((40 - 20) + (40 - 20) + (40 - 20))) + 20 = 30 MW

[0078] P2 = (90 - (20 + 20 + 20)) * ((40 - 20) / ((40 - 20) + (40 - 20) + (40 - 20))) + 20 = 30 MW

[0079] P3 = (90 - (20 + 20 + 20)) * ((40 - 20) / ((40 - 20) + (40 - 20) + (40 - 20))) + 20 = 30 MW

[0080] That is, when the given target load is 90 MW, the power setting values of the 3 units are all 30 MW.

[0081] Calculation example 2: Assume the current output of each of the 3 units is 25 MW, that is, P1 = P2 = P3 = 25 MW, and the current total output of the 3 units is P1 + P2 + P3 = 75 MW; if it is necessary to decrease the target load of the 3 units to 45 MW, that is, Pset = 45 MW, then the calculation method for the output values of the 3 units after adjustment is as follows:

[0082] P1 = (45 - (20 + 20 + 20)) * ((40 - 20) / ((40 - 20) + (40 - 20) + (40 - 20))) + 20 = 15 MW

[0083] P2 = (45 - (20 + 20 + 20)) * ((40 - 20) / ((40 - 20) + (40 - 20) + (40 - 20))) + 20 = 15 MW

[0084] P3 = (45 - (20 + 20 + 20)) * ((40 - 20) / ((40 - 20) + (40 - 20) + (40 - 20))) + 20 = 15 MW

[0085] After calculation, the power set values of the last three units are all 15 MW. However, this power set value is within the vibration range of the unit (10 - 20 MW). Therefore, it is necessary to recalculate to avoid the unit operating within the vibration range. At this time, the unit must cross the vibration zone. According to the method proposed in Step 2, calculate and select the permutation and combination with the least total number of times to cross the vibration zone as the target operable range. It is calculated that Unit 1 crosses the vibration zone, and the operable range is adjusted from the 20 - 40 MW range to the 0 - 10 MW range, while Unit 2 and Unit 3 still operate in the 20 - 40 MW range.

[0086] Then the calculation of the target load of each unit is as follows:

[0087] P1 = (45 - (0 + 20 + 20)) * ((10 - 0) / ((10 - 0) + (40 - 20) + (40 - 20))) + 0 = 1 MW

[0088] P2 = (45 - (0 + 20 + 20)) * ((40 - 20) / ((10 - 0) + (40 - 20) + (40 - 20))) + 20 = 22 MW

[0089] P3 = (45 - (0 + 20 + 20)) * ((40 - 20) / ((10 - 0) + (40 - 20) + (40 - 20))) + 20 = 22 MW

[0090] That is, when the given target value is 45 MW, the power set value of Unit 1 is 1 MW, and the power set values of Unit 2 and Unit 3 are both 22 MW; Unit 1 has completed crossing the vibration zone, and its working range has been adjusted from the 20 - 40 MW range to the 0 - 10 MW range, crossing the 10 - 20 MW vibration range; Unit 2 and Unit 3 still operate in the 20 - 40 MW working range after adjustment, and the working range remains unchanged. After adjustment, the number of times of crossing the vibration zone is 1 time, and the load change is ΔP = (25 - 1) + (25 - 22)

[0091] + (25 - 22) = 30 MW, which meets the adjustment principle of the least number of times of crossing the vibration zone and the smallest load fluctuation when the load distribution must cross the vibration zone.

[0092] Embodiment of Automatic Generation Control System

[0093] As Figure 1 shown is an automatic generation control system proposed by the present invention. The automatic generation control system of this hydropower station includes a regulating hydropower station AGC, which is used to communicate with the energy management system of the dispatching center to obtain the target output of the hydropower station.

[0094] Specifically, the regulated hydropower station AGC is used to determine the operable range of each unit according to the vibration area of each unit of the hydropower station and the output range of each unit. By arranging and combining the operable ranges of each unit, the total output range of the hydropower station under each permutation and combination is obtained, and the permutation and combination that meets the target output of the hydropower station is selected according to the total output range; the regulated hydropower station AGC also determines the number of times each unit needs to cross the vibration area under each permutation and combination adjusted to meet the target load according to the current output of each unit of the hydropower station, and selects the operable range of each unit under the permutation and combination with the least total number of times of crossing the vibration area as the target operable range of each unit, and calculates the target output of each unit according to the selected target operable range.

[0095] Among them, the formula for calculating the target output of each unit is:

[0096]

[0097] Among them, P i is the target output of unit i, P set is the target output of the hydropower station, P imin is the minimum output value of unit i in the target operable range, and ΔP i is the range value of the target operable range of unit i.

[0098] When there are at least two minimum values of the total number of times of crossing the vibration area corresponding to the permutation and combination that meets the target load and they are the same, the regulated hydropower station AGC calculates the power change value of each unit from the current output to the permutation and combination that meets the target load, and selects the permutation and combination with the minimum sum of the power change values of all units as the target operable range.

[0099] The specific implementation process has been described in detail in the method embodiment and will not be elaborated here.

[0100] Embodiment of computer storage medium

[0101] The present invention proposes a computer storage medium, in which a computer program is stored. The computer program is used to implement the automatic generation control method of hydropower units adapted to the new power system as described above. The computer program includes a permutation and combination calculation module, a calculation module, and a distribution module. Among them, the permutation and combination calculation module is mainly used to calculate all permutations and combinations of the hydropower station according to the vibration area of each unit and the total output range of each unit; the calculation module is mainly used to select the target operable range according to the target output of the hydropower station issued by the energy management system of the dispatching center and the principle of the minimum number of times of crossing the vibration area; the distribution module is mainly used to allocate the target output for each unit according to the target operable range.

[0102] The computer program can be passed through such as Figure 3 and Figure 4The displayed interface shows the operation status of each unit of the current hydropower station to the staff, and facilitates the staff to manually adjust the unit according to the actual situation.

[0103] The embodiments of the computer storage medium described above are only illustrative. The division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not executed.

[0104] The specific implementation process has been described in detail in the method embodiments and will not be repeated here.

Claims

1. A method for controlling automatic power generation of a hydroelectric unit, characterized in that the steps include: 1) Screen out the permutations and combinations of the operable ranges of each unit of the hydropower station that meet the target output of the hydropower station; 2) Using the current output of each unit of the hydropower station to determine the number of times each unit needs to cross the vibration zone under each permutation combination that meets the target output of the hydropower station, the operating range of each unit under the permutation combination with the least total number of times the vibration zone needs to be crossed is selected as the target operating range of each unit; 3) Determine the target output of each unit according to the target output of the hydropower station and the target operating range of each unit, and control each unit according to the target output.

2. The automatic power generation control method of a hydroelectric generator set according to claim 1, characterized in that: The step 3) is to determine the target output of each unit according to the proportion of the range value of the target operable range of the unit in the sum of the target operable range values ​​of all units, wherein the target operable range value is the difference between the maximum output value and the minimum output value of the target operable range.

3. The automatic power generation control method of a hydroelectric generator set according to claim 2, characterized in that: The formula for calculating the target output of each unit is: Among them, P i is the target output of unit i, P set To achieve the target output of the hydropower station, P imin is the minimum output value of unit i in the target operating range, ΔP i is the target operating range value of unit i.

4. The automatic power generation control method of a hydroelectric generator set according to claim 1, characterized in that: When there are at least two permutations and combinations with the least total number of crossing the vibration zone, calculate the power change value of each unit from the current output to the permutation and combination with the least total number of crossings, and select the permutation and combination with the smallest sum of power change values ​​of all units as the target operable range.

5. An automatic power generation control system, characterized in that: It includes an AGC for regulating a hydropower station, which is used to communicate with an energy management system of a dispatching center to obtain a target output of the hydropower station. The AGC for regulating a hydropower station is used to screen out permutations and combinations that meet the target output of the hydropower station. The AGC for regulating a hydropower station also uses the current output of each unit in the hydropower station to determine the number of times each unit needs to cross a vibration zone under each permutation and combination adjusted to meet the target output of the hydropower station, selects the operating range of each unit under the permutation and combination with the least total number of times that the vibration zone needs to be crossed as the target operating range of each unit, and calculates the target output of each unit based on the selected target operating range.

6. The automatic power generation control system according to claim 5, characterized in that: The AGC of the hydropower station determines the target output of each unit according to the proportion of the target operating range value of the unit in the sum of the target operating range values ​​of all units, where the target operating range value is the difference between the maximum output value and the minimum output value of the target operating range.

7. The automatic power generation control system according to claim 6, characterized in that: The formula for calculating the target output of each unit is: Among them, P i is the target output of unit i, P set To achieve the target output of the hydropower station, P imin is the minimum output value of unit i in the target operating range, ΔP i is the target operating range value of unit i.

8. The automatic power generation control system according to claim 6, characterized in that: When there are at least two permutations and combinations with the least total number of times crossing the vibration zone, the AGC of the hydropower station will calculate the power change value of each unit from the current output to the permutation and combination with the least total number of times, and select the permutation and combination with the smallest sum of power change values ​​of all units as the target operating range.

9. A computer storage medium, characterized in that The computer storage medium stores a computer program to implement the automatic power generation control method for a hydroelectric generator set as described in any one of claims 1 to 4.

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