Control method for avoiding system load oscillation caused by new energy power fluctuation by using hydroelectric unit intelligent start-stop

Abstract

The application discloses a control method for avoiding system load oscillation caused by new energy power fluctuation by using intelligent start and stop of hydroelectric generating set, and the method calls hydroelectric rotating reserve capacity and timely stops to provide sufficient adjustable lower limit, so as to improve the hydroelectric adjustable capacity and provide the maximum support for system frequency stability. The adjustable hydroelectric power station has the unit intelligent start and stop function, can realize completely automatic start and stop control according to the system load, when the power generation output of the hydroelectric power station has reached the maximum output upper limit or is close to the maximum output upper limit under the current water head, the standby unit can be automatically started to provide more rotating reserve capacity, when the output of the hydroelectric power station has reached or is close to the minimum technical output lower limit, the stop operation can be automatically executed to pass through the vibration area, so that more load down-regulation space is provided, and thus reliable guarantee is provided for the stability of the power system, and the system oscillation caused by new energy power fluctuation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water and new energy power complementary regulation, in particular to a control method for avoiding system load oscillation caused by new energy power fluctuation by using intelligent start and stop of water turbine generator. BACKGROUND

[0002] 1、AGC is the abbreviation of Automatic Generation Control, according to the set value issued by the dispatching, centralized control, power plant and other regulation sources, or the external adjustment instruction, after necessary logical operation, the power generation value is distributed to the generator group, and the generator set adjusts the power output according to a certain adjustment rate to meet the service requirements of power system frequency and tie-line power control. For dispatching, it has the function of issuing adjustment instruction of active set value according to the load demand of power system; for centralized control or single power plant, it has the functions of putting into single machine AGC, putting into whole plant AGC, putting into whole plant AGC closed loop control, switching regulation source and executing dispatching issued adjustment instruction.

[0003] 2、The intelligent start and stop of water turbine generator currently has various strategies, in order to meet the matching requirement of new energy power load fluctuation and ensure the stability of power system load and frequency, the situation perception mode is adopted to realize the intelligent start and stop control strategy of water turbine generator. According to the actual situation, the whole plant AGC regulation source of the hydropower station is mostly dispatching, so the specific perception objects are: the active set value issued by the dispatching, the actual value of new energy power active output, the actual active output value of the power plant, the maximum technical output of the power plant, the minimum technical output of the power plant, the guide vane opening and the like, through perceiving the corresponding load set requirement and the relevant parameters of the power plant, the standby unit is started in advance or the vibration zone is timely cut down to increase the rotating standby capacity, so as to prevent the system impact caused by the fluctuation of new energy power and ensure the stability of power system load and frequency.

[0004] 3, Secondary frequency modulation: in the power system, electricity is used immediately, electricity can not be stored, even if the current power system energy storage power station, energy storage device, in fact, the proportion of storage electricity is small, and has regional. So, the power system must exist between the balance of power generation and electricity, when the power generation is higher than the electricity, the power system shows the frequency increases, when the power generation is lower than the electricity, the power system shows the frequency decreases, so the key to the stability of the power system is the stability of the frequency, in our country, the rated frequency of the power system is 50 Hz, in fact, in the actual use process, there is no absolute 50 Hz frequency balance, as long as the frequency can be controlled within the allowable fluctuation range, it is considered to be system balance, according to the standard of southern power grid, for hydropower, the frequency is controlled within 50±0.1 Hz to meet the system requirements. When the system frequency is too high, the dispatching issues a command to reduce the active load, reduce the power generation of the power generation end, and reduce the system frequency, when the system frequency is too low, the dispatching issues a command to increase the active load, increase the power generation of the power generation end, and improve the system frequency, so that the system frequency is maintained within the standard range.

[0005] 4, Primary frequency modulation: is one of the basic functions of grid-connected power generation group, which can automatically adjust the power generation of generator set according to the system frequency, of course, the adjustment amount of primary frequency modulation is limited, when the primary frequency modulation still can not meet the system frequency requirements, the secondary frequency modulation manual setting control mode is adopted to ensure the stability of the power system frequency. Primary frequency modulation refers to when the power system frequency reaches the set threshold value within the standard range, the generator set automatically responds to the adjustment, increases or reduces part of the active load to stabilize the system frequency control mode. For example, in the grid-connected condition of hydropower unit in southern power grid, 50±0.06 Hz is the frequency difference limit of primary frequency modulation action of hydropower unit, when the system frequency reaches 50±0.06 Hz boundary, the primary frequency modulation will increase the active power of the unit on the basis of the original set value; When the system frequency reaches 50-0.06 Hz boundary, the primary frequency modulation will reduce the active power of the unit on the basis of the original set value; Through the above method, the system frequency is automatically stabilized. Of course, not every generator set can ensure the correct action of primary frequency modulation, even if the correct action can not complete the integral power of primary frequency modulation to meet the design standard, because there are constraints such as speed governor action dead zone, response time and other unit characteristics.

[0006] 5. Low frequency oscillation of power system: With the improvement of power system technology, the excitation system gradually adopts voltage deviation proportional regulation. In the case of high amplification, the response speed of voltage is increased, and the excitation system has inertia. The power system presents a lack of damping or negative damping torque, thereby causing power fluctuation on the transmission line. The frequency is generally between 0.1 Hz and 2.0 Hz, which is called low frequency oscillation, also called power oscillation and electromechanical oscillation. For the generator, the main manifestation is the relative swing between the generator rotors. Generally, after the power system is disturbed, low frequency oscillation appears on weakly connected, long distance, heavily loaded transmission lines, which is usually caused by the following disturbances: 1) machine tripping and load shedding, 2) transmission line fault, 3) protection misoperation, 4) circuit breaker equipment fault, 5) loss of load, etc.

[0007] 6. Instability and intermittency of new energy mainly depend on natural factors. The intensity and angle of light are key factors for photovoltaic power generation. Generally, the efficiency of photovoltaic power generation is the highest under the direct sunlight at noon, followed by the morning and afternoon, and the power generation is 0 at night. The output power of photovoltaic power generation is generally a parabola, and its conventional characteristics are intermittent, unstable, and non-adjustable day and night. In order to improve the efficiency of photovoltaic power generation, the photovoltaic panel of a single photovoltaic power generation unit generally has the characteristics of automatically adjusting the angle to adapt to the light angle. In this case, the light angle can be automatically optimized, but there is still a range of angle adjustment for the photovoltaic power generation unit, and the range will still have an impact. In addition, for photovoltaic, weather factors such as overcast, rain, and sunny weather will cause the volatility of photovoltaic power generation. Similarly, wind power generation is more dependent on the speed and direction of the wind. The wind turbine, like the photovoltaic unit, also has a paddle rotation device and a direction device that can automatically adjust the generator to the position with the highest efficiency. However, the wind itself has volatility and intermittency, which also leads to the volatility and intermittency of the output power of wind power generation.

[0008] 7、With the country vigorously promoting clean energy development, improving energy green low-carbon transformation, in recent years, new energy power development has made great progress, at present, the fastest and highest proportion of new energy development belongs to photovoltaic power generation and wind power, both photovoltaic and wind power are closely related to weather, and both have power generation instability, non-adjustable or less adjustable, combined with the above characteristics of power system, to maintain the stability of the system frequency, it is necessary to have a more flexible, adjustable and controllable power source to match it. Looking at the composition of China's power structure, according to the statistics of the National Energy Administration and the China Electricity Council, by the end of 2023, according to installed capacity, thermal power accounted for 47.6%, hydropower accounted for 14.4%, photovoltaic accounted for 20.9%, wind power accounted for 15.1%, nuclear power accounted for 1.9%, and other energy storage power stations accounted for a tiny fraction. In the case of wind power and photovoltaic accounting for 36%, their instability and intermittency further exacerbate the oscillation of power system frequency, and if an accident occurs in the power system, it may cause a large area power system accident, and the adjustment capacity of thermal power and nuclear power is small, the adjustment period is long, and the flexibility is insufficient, so in order to ensure the stability of the power system, the 14.4% of the water power regulation complementary is particularly important. In the management regulations of the South Power Grid, the requirement for active change rate of photovoltaic and wind power as main new energy is 10% of installed capacity, while the requirement for active change rate of water power is 20%, that is, the regulation rate of water power should be twice that of new energy regulation rate, which further shows the flexibility of water power. In the 14.1% of water power, there is little regulation capacity in small hydropower, and some special ones such as Jinghong hydropower station belong to the last stage hydropower station in Lancang River basin, which bears the responsibility of joint patrol law enforcement and stable flow, and considering the international environment, it is not suitable for large flow changes, and has been running almost fixed load for many years, with limited regulation capacity, that is, the currently adjustable water power accounts for about 10%, but in the water-rich southern region, the flexible regulation performance of water power is very obvious for new energy matching effect.

[0009] Based on the above analysis, in order to avoid the impact of unstable and intermittent new energy power on the power system, from the proportion of China's power structure and the adjustable capacity, in addition to the currently negligible energy storage power station, water power is the most suitable power source for new energy complementary matching, but water power and new energy cannot achieve 100% matching, and the most critical problem is that new energy instability may cause power system load oscillation problem, even if water power is flexible, but there is still a regulation boundary, when the system load fluctuation reaches the water power matching boundary, there is still a risk of system frequency oscillation. SUMMARY

[0010] The present application aims to at least partially solve one of the problems in the related art.

[0011] To this end, the application provides a control method for avoiding system load oscillation caused by new energy power fluctuation by using intelligent start and stop of hydroelectric generating set.

[0012] To achieve the above purpose, in one aspect, the application provides a control method for avoiding system load oscillation caused by new energy power fluctuation by using intelligent start and stop of hydroelectric generating set, comprising:

[0013] The regional photovoltaic power station output power calculation module is used to calculate the total output power of each photovoltaic power station, the regional wind power plant output power calculation module is used to calculate the total output power of each wind power plant, the regional water power station adjustable power calculation module is used to calculate the adjustable power of each water power station, the regional other non-adjustable power supply output power calculation module is used to calculate the output power of all non-adjustable power supplies, the regional tie-line transmission power calculation module is used to calculate the total output power of the tie-line, and the regional receiving end power calculation module is used to calculate the power of all receiving ends.

[0014] The logical operation control module of the regional integrated power supply power is used to calculate the sum of the total output power of each photovoltaic power station, the total output power of each wind power plant and the adjustable power of each water power station, and the difference between the non-adjustable power supply output power, the total output power of the tie-line, the receiving end power and the transmission loss power, and when the difference is not equal to zero, it indicates that the frequency of the power system changes, if the frequency change is within the preset interval range, the system stability requirement is met, when the system frequency exceeds the preset interval range, a primary frequency modulation action is triggered to pull the frequency back to this range, if the primary frequency modulation action cannot pull the frequency back, the logical operation control module of the regional integrated power supply power sends a load adjustment instruction to the water power station with good adjustment performance;

[0015] The water power station automatic start and stop strategy control module is set, the water power station receives the load adjustment instruction and executes, the difference is close to zero, and the system frequency is pulled back to the preset interval range, if the maximum adjustment amount of all water power stations with adjustment capability in the region cannot meet the requirement of pulling the frequency back to the stable interval, the water power station automatic start and stop strategy control module is used to start and stop the hydroelectric generating set to change the output power boundary condition of the water power station.

[0016] The control method for avoiding system load oscillation caused by new energy power fluctuation by using intelligent start and stop of hydroelectric generating set can further have the following additional technical features:

[0017] In one embodiment of the present application, the logic operation control module of the regional integrated power source power receives active power data from photovoltaic, wind power, hydroelectric power, thermal power, other power sources, tie lines, and receiving ends, and respectively calculates the input and output power sources, sets the photovoltaic input power as , the wind power input power as , the hydroelectric power input power as , the other power source input power as , and obtains the total input power of the region as ; sets the tie line power as , the receiving end power as , and obtains the total output power as .

[0018] In one embodiment of the present application, the regional all photovoltaic power station power acquisition module acquires the photovoltaic power station power, and sends the acquired power to the logic operation control module of the regional integrated power source power. Assuming that there are n photovoltaic power stations in the region, the total photovoltaic input power is:

[0019] .

[0020] In one embodiment of the present application, the regional all wind power station power acquisition module acquires the photovoltaic

[0021] power station power, and sends the acquired photovoltaic power station power to the logic operation control module of the regional integrated power source power. Assuming that there are n wind power stations in the region, the total photovoltaic input power is:

[0022] .

[0023] In one embodiment of the present application, the logic operation control module of the regional integrated power source power receives the safety boundary conditions from all the hydroelectric power stations in the region, and performs screening according to the safety boundary conditions. The power sources that cannot be adjusted and whose output power can be changed at any time are classified as the first type of power sources, the other power sources that cannot be adjusted and whose output power is stable are classified as the second type of power sources, and the power sources whose output power is stable and adjustable but whose adjustable performance is poor are classified as the third type of power sources.

[0024] In one embodiment of the present application, the regional all power source power acquisition module acquires the output power of each power source without adjustment capability, and sends the acquired output power of each power source without adjustment capability to the logic operation control module of the regional integrated power source power. Assuming that there are n power sources without adjustment capability in the region, the total input power is:

[0025] .

[0026] In one embodiment of the present invention, the transmission power of each tie line is collected by the tie line power collection module in the region, where the input is positive and the output is negative, and the collected transmission power of each tie line is sent to the logic operation control module of the regional integrated power supply power. Assuming that there are n tie lines in the region, the total output power is:

[0027] .

[0028] In one embodiment of the present invention, the receiving-end power is collected by the regional receiving-end power collection module and sent to the regional integrated power supply power logic operation control module. Assuming that there are n receiving ends in the region, the total output power is:

[0029] .

[0030] In one embodiment of the present invention, node calculation is performed by a logic operation control module of regional integrated power supply power, that is, ,when When it is positive, the system shows a frequency increase. When the rising frequency reaches 50+0.06Hz, the primary frequency regulation is triggered to adjust downward. When the primary frequency regulation action cannot pull the frequency back to less than 50+0.06Hz, the secondary frequency regulation is triggered. The logic operation control module of the regional integrated power supply power gives priority to sending load reduction instructions to the hydropower with good regulation performance until the frequency is reduced to less than 50+0.06Hz again. When When it is negative, the system frequency shows a decrease. When the decreasing frequency reaches 50-0.06Hz, the primary frequency regulation is triggered to adjust upward. When the primary frequency regulation action cannot pull the frequency back to greater than 50-0.06Hz, the secondary frequency regulation is triggered. The logic operation control module of the regional integrated power supply power gives priority to sending load increase instructions to the hydropower with good regulation performance until the frequency is increased to greater than 50-0.06Hz again.

[0031] In one embodiment of the present invention, the method further includes putting a hydropower station with regulation capability into plant-level AGC control. The hydropower station dispatches active power set values, AGC unit guide vane openings, minimum technical output lower limit, and maximum technical output upper limit through situational awareness detection, and determines startup or shutdown in advance to provide regulation space for the system regulation demand and meet the system regulation demand.

[0032] The control method for avoiding system load oscillation caused by new energy power fluctuation by using the intelligent start-stop of the hydroelectric generating set can realize completely automatic start and stop control according to system load, can automatically start the standby unit to provide more rotating standby capacity when the power generation output of the hydroelectric station has reached or is close to the maximum output upper limit under the current water head, and can automatically pass through the vibration zone to perform the stop operation and provide more load down-regulation space when the power generation output of the hydroelectric station has reached or is close to the minimum technical output lower limit, thereby providing reliable guarantee for the stability of the power system and avoiding system oscillation caused by new energy power fluctuation.

[0033] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0035] Figure 1 A flow chart of the control method for avoiding system load oscillation caused by new energy power fluctuation by using the intelligent start-stop of the hydroelectric generating set of the present application;

[0036] Figure 2 A hydroelectric, wind power and solar power generation trend chart of a certain regional power grid of the present application;

[0037] Figure 3 A regional hydroelectric generating set intelligent start-stop logic main flow chart of the present application;

[0038] Figure 4 A regional power source operation module load flow direction schematic diagram of the present application;

[0039] Figure 5 A hydroelectric generating set optimal logic schematic diagram of the present application. DETAILED DESCRIPTION

[0040] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0041] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0042] The control method for avoiding system load oscillation caused by new energy power fluctuation by intelligent start-stop of hydroelectric generating set according to the embodiment of the present application is described below with reference to the accompanying drawings.

[0043] Figure 1 The control method for avoiding system load oscillation caused by new energy power fluctuation by intelligent start-stop of hydroelectric generating set according to the embodiment of the present application is described below with reference to the accompanying drawings. Figure 1

[0044] S1, respectively calculating the total output power of each photovoltaic power station, the total output power of each wind power plant, the adjustable power of each hydroelectric station, the output power of all non-adjustable power sources, the total output power of the tie line and the power of all receiving ends by using the output power calculation modules of the regional photovoltaic power station, the output power calculation modules of the regional wind power plant, the adjustable power calculation modules of the regional hydroelectric station with adjustment capability and the output power calculation modules of the regional other non-adjustable power sources respectively;

[0045] S2, calculating the difference between the sum of the total output power of each photovoltaic power station, the total output power of each wind power plant and the adjustable power of each hydroelectric station and the output power of all non-adjustable power sources, the total output power of the tie line, the power of all receiving ends and the power loss by using the logic operation control module of the regional integrated power source, and judging that the difference is not equal to zero, which indicates the change of the power system frequency, if the frequency change is within the preset interval range, the system stability requirement is met, when the system frequency exceeds the preset interval range, triggering the primary frequency modulation action to pull the frequency back to the range, if the primary frequency modulation action cannot pull the frequency back, sending the load adjustment instruction to the hydroelectric station with good adjustment performance through the logic operation control module of the regional integrated power source;

[0046] S3, setting the automatic start-stop strategy control module of the hydroelectric station, the hydroelectric station receives the load adjustment instruction and executes, the difference is close to zero, until the system frequency is pulled back to the preset interval range, if the maximum adjustment amount of all the hydroelectric stations with adjustment capability in the region cannot meet the requirement of pulling the frequency back to the stable interval, starting and stopping the hydroelectric generating set to change the output power boundary condition of the hydroelectric station through the automatic start-stop strategy control module of the hydroelectric station.

[0047] It can be understood that the new energy power in the current Chinese power system is mainly photovoltaic and wind power, and the fluctuation and intermittence of the new energy power are the most obvious. In order to reduce the power change of the tie line of the power system, the present application studies the regional load balance based on the output characteristics of photovoltaic and wind power as new energy power.

[0048] The present application changes the adjustable amount boundary condition by the automatic start-stop mode of the hydroelectric station and the new energy, the user and the tie line, and the specific implementation method is as follows:

[0049] ​The regional integrated power supply logic operation module is responsible for receiving active power data from photovoltaic, wind power, hydroelectric power, thermal power, other power sources, tie lines, receiving ends and the like, and performing summary calculation on input and output power supply power respectively, setting the photovoltaic input power as , the wind power input power as , the hydroelectric power input power as , the other power source input power as , and then obtaining the total input power of the region as ; setting the tie line power as (for the integrated power supply module, the input is positive, and the output is negative), the receiving end power as , and then the total output power as , and the capacity of the certain regional power grid is 2300MW, of which the hydroelectric power is 1600MW, the photovoltaic power is 300MW, and the wind power field is 400MW, and the power generation trend is as shown in Figure 2 .

[0050] Specifically, the regional hydroelectric generator set intelligent start-stop logic of the application is as shown in Figure 3 , including the following steps:

[0051] S1000) Set the regional photovoltaic power station output power calculation module to collect and calculate the sum of the total output power of each photovoltaic power station.

[0052] Through the regional all photovoltaic power station power acquisition module, the photovoltaic power station power is collected, and the collected power is sent to the regional integrated power supply logic operation module, assuming that there are n photovoltaic power stations in the region, and then the total photovoltaic input power is , the daily photovoltaic curve presents a parabolic shape, and there is no power generation at night, and generally 11:00 to 14:00 is the power generation peak period, and a 300MW photovoltaic power station has a power generation distribution as shown in Table 1:

[0053] Table 1

[0054]

[0055] S2000) Set the regional wind power plant output power calculation module to collect and calculate the sum of the total output power of each wind power plant.

[0056] Through the regional all photovoltaic power station power acquisition module, the photovoltaic power station power is collected, and the collected power is sent to the regional integrated power supply logic operation module, assuming that there are n photovoltaic power stations in the region, and then the total photovoltaic input power is , the daily wind power curve completely presents an irregular shape, and there is no rule, and only the next day's wind power generation situation can be evaluated through wind power prediction, and the fluctuation is strong, and the system matching demand is high, and a 300MW wind power field has a daily power generation distribution as shown in Table 2:

[0057] Table 2

[0058]

[0059] S3000) Set up the water power station adjustable power calculation module with adjustment capability, collect and calculate the sum of each water power station adjustable power interval, and form the total regional system adjustable interval.

[0060] The regional integrated power supply logic operation module accepts the safety boundary conditions from all water power stations in the region, filters according to the safety boundary conditions, and classifies the water power stations with adjustment capability into one category and the water power stations without adjustment capability into other power supply categories.

[0061] S3100) Collect the water power station power through the power collection module of all water power stations with adjustment capability in the region, and send the collected power to the regional integrated power supply logic operation module. Assuming that there are n water power stations with adjustment capability in the region, the total water power input is Water power has flexible adjustment, and is used to match the instability and intermittency of new energy, the distribution of water power generation conditions generally matches the instability of the sending end and receiving end of the power system automatically. In the early stage, the proportion of new energy power is small, and water power mainly matches the receiving end changes. The daily power generation curve generally presents a double-humped type. With the increase of the proportion of new energy power, especially the increase of photovoltaic power, the duration of water power low valley in the middle of the day is longer, and the sending load is smaller. Water power bears an important peak shaving task of the power system. The daily power generation distribution of a 1600MW water power plant is shown in Table 3:

[0062] Table 3

[0063]

[0064] S3200) The n water power stations with adjustment capability in the region, each water power station has an upward adjustable capacity of "full plant maximum technical output upper limit-current active power" = So the total upward adjustable capacity of n water power stations is Each water power station has a downward adjustable capacity of "current active power-minimum technical output lower limit" = So the total downward adjustable capacity of n water power stations is .

[0065] S4000) Set up the other non-adjustable power output calculation module of the region, collect and calculate the sum of the output power of all non-adjustable power sources, and this part bears the base load in the region.

[0066] Through the area without power supply power collection module, the output power of each power supply without adjustment capability is collected, and the collected power is sent to the integrated power logic operation module of the area. Assuming that there are n power supplies without adjustment capability in the area, the total input power is This part bears the base load in the power system and does not participate in system regulation.

[0067] S5000) Set the regional tie-line power transmission power calculation module. For the area, the outgoing power is positive and the incoming power is negative. The total outgoing power of the tie-line is collected and calculated.

[0068] Through the area tie-line power collection module, the transmission power of each tie-line is collected, the incoming power is positive and the outgoing power is negative, and the collected power is sent to the integrated power logic operation module of the area. Assuming that there are n tie-lines in the area, the total outgoing power is .

[0069] S6000) Set the regional receiving end power calculation module. All receiving end powers are collected and summed.

[0070] Through the area receiving end power collection module, the receiving end power is collected, and the collected power is sent to the integrated power logic operation module of the area. Assuming that there are n receiving ends in the area, the total outgoing power is .

[0071] S7000) Set the regional "photovoltaic + wind power + hydroelectric power + other power - tie-line power - receiving end power - transmission loss" integrated power logic operation control module. This module classifies photovoltaic, wind power and other non-adjustable and output power variable power sources as one type of power source, classifies other non-adjustable power sources and output power stable as one type of power source, and classifies thermal power and other output power stable and adjustable but poor in adjustment performance as one type of power source. When "photovoltaic + wind power + hydroelectric power + other power - tie-line power - receiving end power - transmission loss" is not equal to 0, the power system frequency changes. Set the regional frequency analysis control module. If the frequency change is within the range of 50±0.06 Hz, it meets the system stability requirement. When the system frequency exceeds this range, trigger a frequency regulation action to pull the frequency back to the range. If the amount of primary frequency regulation action cannot pull the frequency back, the integrated power logic operation control module sends a load adjustment instruction to the hydroelectric power with good adjustment performance, i.e. the secondary frequency regulation of the system.

[0072] S8000) Set up the automatic start-stop strategy control module of the hydropower station, the hydropower station receives the above-mentioned power regulation instruction and executes, and "photovoltaic + wind power + hydropower + other power - tie line power - receiving end power - power transmission loss" is close to 0, until the system frequency is pulled back to the 50±0.06 Hz interval range, if the maximum adjustment amount of all the hydropower stations with adjustment capacity in the region still cannot meet the pulling back of the frequency to the stable interval, then the automatic start-stop strategy control module of the hydropower station can be used to start and stop the hydropower unit to change the output power boundary condition of the hydropower, and in this case, the advance start and stop are the core of the present application.

[0073] S8100) For the specific embodiment, the regional type is reduced to a water, wind and light station model, and the water, wind and light stations are balanced in priority, and there is the following relationship, in a period of Δt, let the change amount of the active power dispatching set value of the station be ΔPd, let the change amount of the sum of the wind power and the photovoltaic power of the station be ΔPx, and let the active power change amount of the water power station be ΔPs, and then the balance satisfies ΔPd=|ΔPs-ΔPx|, whether the matching balance process can cause the low-frequency oscillation of the power system depends on whether ΔPs exceeds the adjustable boundary of the water power station, and the adjustable boundary of the water power station can be changed by changing the number of units in operation, so as to avoid the possibility of causing the low-frequency oscillation of the system frequency, and as for the triggering condition of the advance automatic start of the water power station, there are the following several kinds:

[0074] S8110) Triggering condition: daily active power plan curve + frequency modulation bid curve. For the water power station connected with the switching station and having photovoltaic power and wind power, the water power station balances the photovoltaic power and the wind power in priority, in order to ensure the advance start, the water power station can start a certain time in advance and stop a certain time in lag according to the daily plan curve + frequency modulation bid curve of the dispatching issued to the water power station, so as to increase the adjustable upper and lower limit boundary of the system in advance;

[0075] S8120) Let the daily active power plan curve + frequency modulation bid curve of the water power station at t time be Pt, the maximum output of the unit of the water power station be Ph, the upper limit value Ps of the unit vibration zone of the water power station be Ps, and the number of units in operation be n, when Pt>nPh, the unit starts at t-15 minutes, and the daily active power plan curve + frequency modulation bid curve is satisfied in advance, when Pt<nPs+20MW, the unit is stopped, and the lower limit of the system load regulation is expanded in advance.

[0076] S8210) Triggering condition: free adjustable capacity. The free adjustable capacity is the upward and downward adjustable capacity on the basis of the actual active power value of the whole plant. When the upward free adjustable capacity is less than the set value, the unit is triggered to start, and when the downward free adjustable capacity is less than the set value, the unit is triggered to stop, so as to realize the advance start and stop to meet the change of the adjustable upper and lower limit boundary of the system.

[0077] S8310) The selection mode of automatic start and stop of the hydroelectric generating set is first based on comparison of the regulation performance of the hydroelectric power station AGC, such as regulation accuracy, response time, regulation rate, etc., to set the comprehensive regulation performance of the hydroelectric power station as k, and the smaller the k value, the better the regulation performance of the hydroelectric power station, and the regulation performance of the n hydroelectric power stations in the region is: , the regional power logic operation module is selected = , the start or stop instruction is sent to the m hydroelectric power station through the module, and the automatic start and stop operation is performed by the m hydroelectric power station.

[0078] S8320) The start and stop sequence selection mode of the m hydroelectric power station, the number of hydroelectric generating sets in the region is set as n, the priority of the generating set is set as 1, 2, 3…n, 1 is the highest priority, and n is the lowest priority, the priority of the AGC operation generating set is higher than that of the standby generating set, when the start instruction is received, the standby generating set with the highest priority is started first, when the stop instruction is received, the generating set with the highest priority in the running generating set is stopped first, at this time, the priority of the stopped generating set becomes the lowest, that is, n, and the priority of the other generating sets is reduced by 1. This priority selection of the generating set start and stop can automatically realize the rotation of the hydroelectric generating set in the hydroelectric power station.

[0079] S8330) The start mode of the hydroelectric generating set optimization module, the module accurately selects the hydroelectric generating set suitable for the current regional operation condition according to the power demand and the hydroelectric resource condition in the region, the small and high-efficiency performance-optimal hydroelectric generating set is preferentially selected for operation in the low-load period, so as to avoid the low-efficiency operation of the large generating set; and the large-capacity hydroelectric generating set is started to meet the power demand in the peak high-load demand period, so as to avoid the oscillation risk caused by the rapid fluctuation of new energy such as photovoltaic and wind power.

[0080] Specifically, Figure 4 is a load flow diagram of the regional power operation module of the application, Figure 5 is a hydroelectric generating set optimization logic diagram of the application; the specific steps of S7000) to S8000) of the application are as follows:

[0081] The node calculation is performed through the regional integrated power logic operation module, that is, , when is positive, the system shows frequency rise, when the rising frequency reaches 50+0.06 Hz, the primary frequency regulation is triggered to reduce the regulation, when the primary frequency action amount still cannot pull the frequency back to less than 50+0.06 Hz, the secondary frequency regulation is triggered, the load reduction instruction is preferentially sent to the hydroelectric power station with good regulation performance through the integrated power logic operation control module, and the frequency is reduced to less than 50+0.06 Hz again; when When it is negative, the system frequency shows a decrease. When the decreasing frequency reaches 50-0.06Hz, the primary frequency regulation is triggered to adjust upward. When the primary frequency regulation action still cannot pull the frequency back to greater than 50-0.06Hz, the secondary frequency regulation is triggered. The integrated power supply logic operation control module preferentially sends load increase instructions to hydropower with good regulation performance until the frequency is restored to greater than 50-0.06Hz.

[0082] When the secondary frequency regulation action is triggered, the integrated power supply logic operation module will send the regulation instructions to the hydropower station with better regulation performance based on the collected power supply information with regulation capability to perform load adjustment. When the upward or downward regulation capacity of the area is insufficient, the system frequency oscillation may be caused by changes in the transmission power of wind power and photovoltaic power.

[0083] During a period of time Δt, the sum of the changes in photovoltaic and wind power is ΔPx. The integrated power supply logic operation module needs to send the active power regulation value change ΔPd to the hydropower station. However, due to the influence of the safety boundary conditions of the hydropower station, the hydropower regulation change range is [Ps(min), Ps(max)]. When ΔPd=|ΔPs-ΔPx|regulation cannot be met, the system frequency will increase or decrease. During a period of time Δt, if the photovoltaic and wind power output power fluctuates, the system adjustable capacity will sometimes be satisfied and sometimes not, and the system frequency will also fluctuate, that is, the system frequency oscillation will occur.

[0084] In order to solve this problem, the present invention considers changing the range of hydropower regulation variation by automatically starting and stopping the machine, that is, by changing the hydropower safety boundary conditions to compensate for the problem of insufficient hydropower matching regulation.

[0085] When the power system in the region lacks downward adjustment capacity, it will be manifested as an obstruction in reducing power generation, resulting in an increase in system frequency. If the output power of renewable energy fluctuates, it may cause system frequency oscillation. The safety boundary conditions of the adjustable hydropower station can be changed by shutting down in advance to free up more room for downward adjustment.

[0086] For example, the minimum technical output limit of a hydropower station is , The number of AGC units put into operation in this hydropower station, The upper limit of the vibration zone of the hydropower station unit is as follows: when the downward adjustment capacity is insufficient, after stopping one unit, the minimum technical output lower limit of the whole plant is becomes , and each hydropower station will follow suit, releasing more downward regulation capacity in advance to achieve complementary matching between hydropower and new energy power.

[0087] When the regional power system lacks upward regulation capacity, that is, the increase of power generation is blocked, and the system frequency decreases, the system frequency oscillation may be caused by the output power fluctuation of new energy. The safety boundary condition of the adjustable hydropower station can be changed by starting the unit in advance to increase the upward regulation space. For example, the upper limit of the maximum technical output of a hydropower station is , , the number of AGC units for the hydropower station is , and the maximum output of the hydropower station unit is , when the upward regulation capacity is insufficient, after starting a standby unit, the upper limit of the full plant maximum output changes from to , and each hydropower station is executed in turn to release more upward regulation capacity in advance, realizing the complementary matching of hydropower and new energy power.

[0088] The implementation of the pre-starting and stopping mode according to the "planning curve + frequency modulation bidding curve" is as follows:

[0089] The active power planning curve issued by the dispatching is a discrete point every 5 minutes. The planning curve issued by the dispatching is divided into high-density discrete values of every 10 seconds by interpolation, and the daily active power planning curve is drawn;

[0090] The frequency modulation bidding is a step curve with whole hours as the period. Here, no splitting is done, and the high-density daily planning curve after splitting is directly superimposed to draw the superimposed active power planning curve;

[0091] The hydropower station obtains the number of running units according to the active power planning curve value after superimposition of the daily planning and the frequency modulation bidding , and the maximum output of the hydropower station unit under the current water head, through the following automatic starting and stopping logic operation of the hydropower station. When the number of running units does not match the active power planning curve, automatic starting and stopping operation is performed to meet the secondary frequency modulation demand of the system.

[0092] For automatic starting, the main consideration parameter is the maximum technical output upper limit value. Combined with the actual unit from the issued starting order to the grid connection time, the starting mode in advance is adopted, for example, starting 15 minutes in advance according to the planning curve. The active power planning curve value within 15 minutes after scanning by the automatic starting and stopping logic operation device is , when the full plant has units running, then the maximum technical output upper limit is , when the scanning detects that the active power planning curve value within 15 minutes is , , then a standby unit is automatically started, and according to the calculation of the starting to grid connection time, the maximum technical output upper limit value is increased to , to meet the dispatch active set value, frequency modulation bid curve, daily active plan curve requirements.

[0093] After automatic start, the unit AGC is automatically put into by the automatic start-stop device, and when the active power of the unit and the active power of other units complete matching adjustment, the unit AVC is automatically put into by the automatic start device for reactive power adjustment and balance between units. By adjusting active power and reactive power separately, frequency and voltage fluctuations caused by simultaneous adjustment can be avoided.

[0094] For automatic shutdown settings, the minimum shutdown mode principle is adopted to provide the maximum rotating standby capacity for the system under the current mode, and the main consideration parameter is the minimum technical output lower limit value. According to the regional AGC control strategy of the South Power Grid, the calculation method for the minimum technical output lower limit value of a hydropower station is that the minimum technical output lower limit value of a single unit is the upper edge value of the unit vibration zone The total active load of all units in the plant is The total active load of all units in the plant is The minimum technical output lower limit value of the entire plant is The current shutdown strategy takes a 20MW downward pass, and when the dispatch active set value is issued, a unit is automatically selected to pass through the vibration zone by the automatic start-stop logic operation device, the active power is reduced to within the allowed shutdown range, the unit AGC is automatically exited, the reactive power is automatically adjusted to within the allowed range, and the unit AVC is automatically exited.

[0095] The shutdown conditions of the unit are detected by the automatic start-stop device, and the shutdown instruction is automatically issued. The monitoring system automatically executes the shutdown instruction, monitors the normal shutdown process, and completes the automatic shutdown. The minimum technical output lower limit value of the hydropower station is changed from to The safety boundary conditions of the hydropower station are changed by timely shutdown to meet the dispatch active set value, frequency modulation bid curve, daily active plan curve, and new energy complementary matching requirements.

[0096] The automatic start-stop mode according to the "free adjustable capacity" is realized. The free adjustable capacity refers to the upward and downward adjustable capacity based on the actual value.

[0097] The current active actual value is , the upward free adjustable capacity is , and the upward free adjustable capacity is set to 40MW. When , a standby unit is started by the automatic start-stop device, the unit AGC is automatically put into after the unit is connected to the grid, and the AVC is automatically put into after the active power balance is distributed. The automatic start is completed, and at this time the upward free adjustable capacity of the hydropower station is changed from to , meet the dispatch active set value, frequency modulation in the standard curve, daily active plan curve, new energy complementary matching demand.

[0098] Downward free adjustable capacity , set the upward free adjustable capacity to 30MW, when , through the automatic start-stop device, select a unit to pass through the vibration zone to stop, the unit active reduces to the allowed stop range, automatically exit the unit AGC, automatically adjust the reactive power to the allowed stop range to automatically exit the unit AVC, execute the automatic stop, at this time the downward free adjustment capacity of the hydropower station changes from to , meet the dispatch active set value, frequency modulation in the standard curve, daily active plan curve, new energy complementary matching demand.

[0099] After the regional centralized power calculation module is operated to meet the hydropower station start-up conditions, the unit optimization start-up module is triggered, the hydropower unit in the region has units, the unit hydropower unit power , the unit hydropower unit selection variable is , the maintenance cost and daily operation and maintenance cost of the unit is , at this time the hydropower unit optimization function is , to ensure that under different load conditions, the hydropower unit can generate power with the highest efficiency, thereby maximizing the utilization efficiency of hydropower resources.

[0100] Let the total active power demand of the selected region be , then the hydropower unit optimization power demand constraint condition ≥ , the selected unit capacity constraint condition , wherein and are the maximum active and minimum active of the unit hydropower unit, and further ensure the optimal operation of the regional hydropower unit.

[0101] Whether it is to realize automatic start-stop to avoid system frequency oscillation according to the frequency modulation in the standard curve + daily plan curve, or to realize automatic start-stop to avoid system frequency oscillation according to the free adjustable capacity, the most fundamental principle is to change the boundary conditions of the hydropower station through automatic start-stop in advance through technical means by sensing the adjustable boundary of the hydropower station, so as to achieve the purpose of changing the adjustable boundary of the system.

[0102] S9000) The water power station is provided with a plant-level AGC control with adjustment capability, the water power station detects the active set value, AGC unit guide vane opening, minimum technical output lower limit and maximum technical output upper limit issued by scheduling through situational awareness, determines start-up or shutdown in advance, thereby providing more adjustment space for system adjustment demand, and meets the system adjustment demand.

[0103] The beneficial effects of the present application are as follows:

[0104] 1. The control method for avoiding system oscillation caused by new energy power fluctuation through intelligent start-stop of a hydroelectric generating set, which is based on full consideration of the basic structure of a regional power grid, combined with the form of rapid development of new energy power, based on complementary matching between unstable power sources and adjustable power sources, and additionally provided with a control method for automatic start-stop of a hydroelectric power station, breaks the original power system safety boundary condition, changes the original power system boundary parameter, thereby making the power system have stronger self-adaptive ability.

[0105] 2. The control method for avoiding system oscillation caused by new energy power fluctuation through intelligent start-stop of a hydroelectric generating set, which mainly solves the stability problem of a power system under the condition that the secondary frequency regulation range is limited except for primary frequency regulation, fully considers the national power market reform, superimposes the frequency regulation market bidding curve on the daily planning curve, and realizes automatic start-stop through the sensing of free adjustable capacity, the technology can more strictly meet the system demand, can increase the system power load regulation bandwidth through automatic start-stop in advance, and avoids the system oscillation problem caused by new energy power fluctuation.

[0106] 3. The control method for avoiding system oscillation caused by new energy power fluctuation through intelligent start-stop of a hydroelectric generating set, through two start-up modes of setting sequence and optimization, combined with the power demand and load characteristics in the region, the hydroelectric generating set is reasonably selected to realize the optimal allocation of power in the region, and the risk of system oscillation caused by abnormal reduction of the generating set during the power peak period or important power supply key period can be effectively solved, the continuous and stable power supply in the region is ensured, the power grid in the region is provided with solid power support, and favorable guarantee is provided for power supply in different regions and areas.

[0107] 4. The control method of the present invention avoids system oscillation caused by fluctuations in renewable energy power through intelligent start and stop of hydropower units. At present, the start and stop mode of large-scale hydropower in China is basically manual issuance of orders, and the start and stop process is automatically executed. However, there may be lags or advances in the manual issuance of orders. Regardless of lags or advances, it will bring uncertainties to the stability of the power system. This technology changes the freely adjustable capacity of the regional power system by starting the unit at a controllable time in advance and shutting down on time. It is an improvement in the degree of intelligence and an innovation that liberates labor. After the technology is realized, the personnel will be completely liberated from the entire process of starting, adjusting and shutting down the hydropower station unit, and the automatic start and shutdown realized by the program will be more timely, and its adjustment and matching process will be more stable and safe.

[0108] According to the control method of the embodiment of the present invention, the intelligent start and stop of hydropower units is used to avoid system load oscillation caused by fluctuations in renewable energy power. The hydropower rotating reserve capacity is called in advance and the shutdown is timely to provide a sufficient adjustable lower limit, so as to improve the hydropower adjustable capacity and provide the greatest support for the system frequency stability. The adjustable hydropower station has the intelligent start and stop function of the unit, which can realize fully automatic start and shutdown control according to the system load. When the power generation output of the grid-connected units of the hydropower station has reached the maximum output upper limit under the current head or is close to the maximum output upper limit, the standby units can be automatically started to provide more rotating reserve capacity; when the output of the grid-connected units of the hydropower station has reached or is close to the minimum technical output lower limit, it can automatically cross the vibration zone to perform a shutdown operation, providing more load reduction space, thereby providing reliable protection for the stability of the power system and avoiding system oscillation caused by fluctuations in renewable energy power.

[0109] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Claims

1. A control method for avoiding system load oscillation caused by new energy power fluctuations by using intelligent start and stop of hydropower units, characterized in that: include: The regional photovoltaic power station output power calculation module is used to calculate the total grid-connected output power of each photovoltaic power station, the regional wind power plant output power calculation module is used to calculate the total grid-connected output power of each wind power plant, the regional hydropower station adjustable power calculation module with regulation capability is used to calculate the adjustable power of each hydropower station, the regional other non-adjustable power supply output power calculation module is used to calculate the output power of all non-adjustable power supplies, the regional interconnection line transmission power calculation module is used to calculate the total output power of the interconnection line, and the regional receiving end power calculation module is used to calculate the power of all receiving ends; The logic operation control module of the regional integrated power supply power is used to calculate the difference between the sum of the total grid-connected output power of each photovoltaic power station, the total grid-connected output power of each wind power plant and the adjustable power of each hydropower station and the output power of the non-adjustable power supply, the total output power of the tie line, the receiving end power and the transmission loss power. When it is determined that the difference is not equal to zero, it is shown that the power system frequency changes. If the frequency change is within the preset range, the system stability requirement is met. When the system frequency exceeds the preset range, a frequency regulation action is triggered to bring the frequency back to this range. If the frequency regulation action cannot bring the frequency back, a load regulation instruction is sent to the hydropower station with good regulation performance through the logic operation control module of the regional integrated power supply power. A hydropower station automatic start-up and shutdown strategy control module is set up. The hydropower station receives and executes the load adjustment instruction, and the difference is close to zero until the system frequency is pulled back to the preset range. If the maximum adjustment amount of all hydropower stations with adjustment capabilities in the area cannot meet the requirements of pulling the frequency back to the stable range, the hydropower station automatic start-up and shutdown strategy control module is used to start and stop the hydropower units to change the hydropower output power boundary conditions; The hydropower station automatic start-up and shutdown strategy control module is also used to: S8100) reduces the regional model to a hydropower, wind power, and solar power co-station model. Prioritizing balance within the hydropower, wind power, and solar power stations, the following relationship exists: within a period of Δt, let the change in the set value issued by the station's active power dispatch be ΔPd, let the change in the sum of the station's wind power and photovoltaic power be ΔPx, and let the change in the station's hydropower active power be ΔPs. The balance satisfies ΔPd = |ΔPs - ΔPx |. The triggering conditions for the hydropower station's automatic early startup are as follows: S8110) Trigger conditions: Daily active power plan curve + frequency regulation winning bid curve. For hydropower stations with both photovoltaic and wind power connected to their switchyards, hydropower prioritizes balancing the photovoltaic and wind power at the same station. To ensure early startup, the system starts up a certain amount in advance and shuts down a certain amount later, according to the daily plan curve + frequency regulation winning bid curve issued by the dispatcher. This increases the system's upper and lower adjustable limits in advance. S8120) Assume that at time t, the daily active power plan curve + the frequency regulation winning bid curve = Pt, the maximum output of the hydropower station units is Ph, the upper edge of the vibration zone of the hydropower station units is Ps, and the number of operating units is n. If Pt>nPh, then start the units at t-15 minutes to meet the daily active power plan curve + the frequency regulation winning bid curve in advance. If Pt<nPs+20MW, execute the shutdown to expand the lower limit of system load reduction in advance. S8210) Trigger condition: Freely adjustable capacity; Freely adjustable capacity is the capacity that can be adjusted upward or downward based on the total active power output of the entire plant; when the upward freely adjustable capacity is less than the set value, the generator is triggered to start; when the downward freely adjustable capacity is less than the set value, the generator is triggered to stop; S8310) Selection of automatic start and stop of hydropower units: First, based on the comparison of the AGC regulation accuracy, response time, and regulation rate regulation performance of the hydropower station, the comprehensive regulation performance of the hydropower station is set to k. The smaller the k value, the better the regulation performance of the hydropower station. The regulation performance of n hydropower stations in the area is: , selected by the regional power logic operation module = , then send a start or stop command to the m hydropower station, and the m hydropower station will perform the automatic start or stop operation; S8320)m Hydropower station start-up and shutdown sequence selection method, assuming the number of hydropower units is n, set the unit priority 1, 2, 3...n, 1 is the highest priority, n is the lowest priority, the priority of the plant-level AGC running unit is higher than the priority of the standby unit. When receiving the start-up command, the unit with the highest priority among the standby units will be started first. When receiving the shutdown command, the unit with the highest priority among the running units will be shut down first. At this time, the priority of the shut-down unit becomes the lowest, that is, n, and the priorities of other units are reduced by 1 at a time.

2. The method according to claim 1, characterized in that The logic operation control module of the regional integrated power supply is used to receive active power data from photovoltaic, wind power, hydropower, thermal power, other power sources, tie lines, and receiving ends, and respectively summarize and calculate the input and output power, setting the photovoltaic input power to , wind power input power is , the hydropower input power is , other power input power is , the total input power in the region is ; Set the tie line power to , the receiving end power is , the total output power is .

3. The method according to claim 2, characterized in that The power of all photovoltaic power stations in the region is collected by the power collection modules, and the collected power is sent to the logic operation control module of the regional integrated power supply power. Assuming that there are n photovoltaic power stations in the region, the total photovoltaic input power is: 。 4. The method according to claim 2, characterized in that The power of photovoltaic power stations is collected through the power collection modules of all wind power stations in the region, and the collected photovoltaic power station power is sent to the regional integrated power supply power Logical operation control module, assuming that there are n wind power stations in this area, the total photovoltaic input power is: 。 5. The method according to claim 2, characterized in that The logic operation control module of the regional integrated power supply receives the safety boundary conditions from all hydropower stations in the region, and screens them according to the safety boundary conditions. The power supplies that are non-adjustable and whose output power can be changed at any time are classified as the first category of power supplies, the power supplies that are other non-adjustable and have stable output power are classified as the second category of power supplies, and the power supplies that have stable and adjustable output power but poor adjustable performance are classified as the third category of power supplies.

6. The method according to claim 2, characterized in that The output power of each power supply without regulation capability is collected by the power collection module of the power supply without regulation capability in the area, and the collected output power of each power supply without regulation capability is sent to the logic operation control module of the regional integrated power supply power. Assuming that there are n power supplies without regulation capability in this area, the total input power is: 。 7. The method according to claim 2, characterized in that The transmission power of each tie line is collected by the tie line power collection module in the area, where the input is positive and the output is negative. The collected transmission power of each tie line is sent to the logic operation control module of the regional integrated power supply power. Assuming that there are n tie lines in this area, the total output power is: 。 8. The method according to claim 2, characterized in that The receiving end power is collected by the regional receiving end power collection module and sent to the regional integrated power supply power logic operation control module. Assuming that there are n receiving ends in this area, the total output power is: 。 9. The method according to claim 2, characterized in that Node calculation is performed through the logic operation control module of the regional integrated power supply, that is, ,when When it is positive, the system shows a frequency increase. When the rising frequency reaches 50+0.06Hz, the primary frequency regulation is triggered to adjust downward. When the primary frequency regulation action cannot pull the frequency back to less than 50+0.06Hz, the secondary frequency regulation is triggered. The logic operation control module of the regional integrated power supply power gives priority to sending load reduction instructions to the hydropower with good regulation performance until the frequency is reduced to less than 50+0.06Hz again. When When it is negative, the system frequency shows a decrease. When the decreasing frequency reaches 50-0.06Hz, the primary frequency regulation is triggered to adjust upward. When the primary frequency regulation action cannot pull the frequency back to greater than 50-0.06Hz, the secondary frequency regulation is triggered. The logic operation control module of the regional integrated power supply power gives priority to sending load increase instructions to the hydropower with good regulation performance until the frequency is increased to greater than 50-0.06Hz again.

10. The method according to claim 1, characterized in that The method also includes putting a hydropower station with regulation capabilities into plant-level AGC control. The hydropower station dispatches active power set values, AGC unit guide vane openings, minimum technical output lower limit, and maximum technical output upper limit through situational awareness detection, and determines startup or shutdown in advance to provide regulation space for system regulation needs and meet system regulation needs.

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