A method for giant hydropower unit AGC to quickly pass through the vibration zone

Abstract

The present invention relates to a method for a giant hydroelectric unit AGC to quickly cross a vibration zone, by adding a state point mark to each unit, the state point mark includes a start mark and a stop mark, and the input of the start mark and the stop mark is limited based on preset conditions; the adjustment action that the hydroelectric unit needs to perform is judged, and the adjustment action is the vibration zone crossing adjustment after the new start-up and grid connection or the vibration zone crossing adjustment during the shutdown and load reduction process, and the automatic adjustment of the vibration zone crossing is completed based on the adjustment action that needs to be performed. The method of the present invention helps to reduce the potential risks caused by system failure or improper operation, and ensure the long-term stable operation of the system.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower unit power grid control, and in particular to a method for a giant hydropower unit AGC to quickly cross a vibration zone. Background Art

[0002] In the power system, AGC is a system that adjusts the active output of multiple generators in different power plants to respond to changes in load. AGC (Automatic Generation Control) is an important function in the energy management system EMS. It controls the output of frequency-regulated units to meet the changing power needs of users and keep the system in an economical operating state.

[0003] The rated power of giant hydropower units is 700-1000MW. The maximum active power that can be generated under each water head is less than or equal to the rated power. When the water head is low, the maximum active power that the unit can generate is less than the rated power. The lower the water head, the less the maximum active power that can be generated. Usually, the vibration zone is below 60% of the lowest rated power of giant units, and the operating stable zone is above 60%. The vibration zone occupies a large operating range. During the startup or shutdown of the unit, since the unit runs in the vibration zone for a long time, it is not conducive to the safety of the unit, so measures need to be taken to quickly cross the vibration zone.

[0004] According to the grid dispatching requirements, after the hydropower unit is put into operation, the AGC (automatic generation control) needs to realize the active power regulation of the unit. Since the vibration zone is below 60% of the minimum rated power (taking 700MW as an example, the minimum rated power is about 400MW), the range is very large. After the unit is started and connected to the grid, it is usually manually adjusted to the stable zone, and then AGC is added for adjustment. When it is necessary to shut down, the unit is first withdrawn from the AGC, the load is manually reduced to 30MW, and then a shutdown order is issued. This does not meet the grid dispatching requirements for automatic and rapid crossing of the vibration zone.

[0005] If the unit is adjusted through AGC to quickly pass through the vibration zone, it needs to pass through the vibration zone after startup and grid connection and when shut down for load reduction (taking 0-400MW as an example). The dispatcher will give the total active power of the whole plant in real time. If the whole plant needs to increase the active power and additional units are needed, after the unit is connected to the grid, if it is immediately operated at 400MW as the target power, other units need to reduce their active power to ensure that the total active power of the whole plant is maintained within the allowable range of the deviation of the dispatcher's active power given value. However, there are two problems: First, the increase in the dispatching active power given value is not large. After the unit is started and connected to the grid, when the unit increases from 0MW to 400MW, the active power reduction of other units may not be so large, resulting in the total active power of the whole plant exceeding the deviation of the dispatching given value beyond the allowable range; for example, when the given value is 750MW, a new unit is started, and the minimum active power that can be generated by the two units in the whole plant is 800MW (because the adjustable lower limit of each unit is 400MW), which causes the deviation between the actual total active power generated by the unit and the given active power to exceed the predetermined range; second, the increase in the number of units started is relatively large, and there may be multiple units with reduced active power. In this adjustment process, the number of units increased and reduced is not equal, which may lead to a faster reduction in active power. In this way, in a certain process, the total active power of the whole plant may not increase but decrease.

[0006] Take a single 700MW unit as an example: when the total active power of the whole plant is 1400MW, both units 1 and 2 are running at full load, both 700MW; when the total active power of the whole plant increases to 1500MW, the new unit 3 needs to be opened to meet the requirements, then the target power of the three units is 500MW, the new unit 3 increases from 0MW to 500MW, and units 1 and 2 decrease from 700MW to 500MW. In this process, since units 1 and 2 reduce their active power at the same time, the increase in active power of unit 3 is lower than the rate of reducing active power of the whole plant, which will result in a significant reduction in the total active power of the whole plant when the active power is increased. At present, there is no simple, convenient and universal method to achieve rapid crossing of the vibration zone through AGC. Summary of the invention

[0007] The present invention aims at solving the above technical problems and provides a simple, convenient and universal method for quickly crossing the vibration zone through AGC.

[0008] In order to achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical solutions:

[0009] A method for a giant hydroelectric generator set AGC to quickly pass through a vibration zone, the method comprising the following steps:

[0010] Step 1: add a status point mark to each unit, wherein the status point mark includes a start-up mark and a stop-up mark, and the input of the start-up mark and the stop-up mark is limited based on preset conditions.

[0011] The startup flag is activated after the unit is started and connected to the grid to allow the unit to join the AGC joint control; the shutdown flag state point is activated when the unit needs to shut down for load reduction and has joined the AGC joint control.

[0012] The limiting input of the start-up sign and the stop sign based on the preset conditions includes:

[0013] When the whole plant AGC is not put into operation, it is not allowed to put into operation the start sign or the stop sign;

[0014] When the unit is not in grid-connected state, it is not allowed to put the start-up sign or shutdown sign into operation;

[0015] When the actual active power generated by the unit is in the stable zone, the start-up sign is not allowed to be activated;

[0016] When the unit is not connected to AGC, it is not allowed to put the shutdown sign into operation;

[0017] When the unit is not operating in the stable zone, the shutdown sign is not allowed to be activated.

[0018] Step 2, determine the adjustment action that the hydropower unit needs to perform, the adjustment action is the adjustment through the vibration zone after the new unit is started up and connected to the grid or the adjustment through the vibration zone during the shutdown and load reduction process, and complete the automatic adjustment through the vibration zone based on the adjustment action that needs to be performed.

[0019] When the adjustment action is the vibration zone crossing adjustment after the newly started grid-connected unit, for the newly started grid-connected unit A, if the start-up mark is put into operation and the AGC is added, the AGC performs the following processing:

[0020] Unit A is listed as adjustable under AGC joint control, but when calculating the total active power of AGC joint control, unit A is treated as a single-control unit.

[0021] Unit A increases its active power at preset time intervals and steps. When the active power setpoint of the entire plant changes or the active power change of unit A exceeds the preset threshold, the AGC redistributes the active power among other units.

[0022] When the actual active power of unit A increases to the upper edge of the vibration zone minus the preset value, the startup mark is exited, and the adjustment process after startup and grid connection is ended.

[0023] When the adjustment action is the vibration zone crossing adjustment during the shutdown and load shedding process, for the B unit that needs to be shut down and load shedding, if the unit is in the AGC joint control adjustable state, after the shutdown mark is put into operation, the AGC performs the following processing:

[0024] Unit B is listed as adjustable under AGC joint control, but when calculating the total active power of AGC joint control, unit B is treated as a single-control unit.

[0025] Unit B reduces its active power at preset time intervals and steps. When the set active power value of the entire plant changes or the active power change of unit B exceeds the preset threshold, the AGC redistributes the active power among other units.

[0026] When the actual active power of unit B is reduced to the lower edge of the vibration zone plus the preset value, the shutdown sign is exited and the shutdown and load reduction adjustment process ends.

[0027] Further, the A unit increases the active power at a preset time interval and step size, and the B unit reduces the active power at a preset time interval and step size, and the preset time interval T and step size P satisfy the formula:

[0028] T=k1*Δt;P=k2*P base ;

[0029] Wherein, Δt is the preset basic time interval, 20s≤Δt≤30s; k1 is the adjustment coefficient of the time interval, 1≤k1≤5; P base is the basic step size, determined based on the rated power of the unit and the range of the vibration zone, P base ≤30MW / 10S; k2 is the step size adjustment coefficient, 1≤k2.

[0030] Furthermore, when the actual active power of unit A increases to the upper edge of the vibration zone minus the preset value, the start-up mark is exited, and when the actual active power of unit B decreases to the lower edge of the vibration zone plus the preset value, the shutdown mark is exited, and the preset value M satisfies the formula:

[0031]

[0032] Among them, α is the adjustment factor of the preset value, which is used to set the margin of the exit start-stop flag; P max is the rated power of the unit; is the power value at the upper or lower edge of the vibration zone. When the unit is A unit, Take the power value of the upper edge of the vibration zone. When the unit is unit B, Take the power value at the lower edge of the vibration zone.

[0033] Furthermore, when the active power given value of the whole plant changes and the active power change of the single-controlled unit A or B exceeds the preset threshold, the AGC redistributes the active power, and the total active power change of the redistribution satisfies:

[0034] ΔP total =ΔP change *β+ΔP redistribution

[0035] Where ΔP total is the total active power change redistributed; ΔP changeIt is the maximum value of the change in the active power given value of the whole plant or the change in the active power of a single controlled unit; β is the amplification factor of the active power change, which is used to adjust the response speed of redistribution; ΔP redistribution It is the change in active power that is redistributed based on the current operating status and regulation capabilities of other units.

[0036] Furthermore, the method also includes a fault handling method for an open shutdown mark state point.

[0037] When an abnormality or fault occurs in the start / stop mark status point, the start / stop process of the current unit is stopped and the abnormal or faulty start / stop mark status point is exited, an alarm is issued and the operator is notified to perform manual intervention.

[0038] Furthermore, the calculation method of the preset time interval adjustment coefficient k1 and step size adjustment coefficient k2 is:

[0039] k1=f(ΔPsystem,Δfsystem)=0.01ΔPsystem+0.5Δfsystem+a

[0040] k2=f(ΔPsystem,Δfsystem,ΔTsystem)=0.02ΔPsyatem-0.2Δfaystem+0.1ln(ΔTsystem+1)+b;

[0041] Among them, ΔPsystem is the change of system active power, Δfsystem is the change of system frequency, ΔTsystem is the system time constant, and a and b are constants.

[0042] Furthermore, limiting the input of the start-up sign and the stop sign based on the preset conditions also includes:

[0043] When the given value is lower than the lower limit of the active power adjustment of the whole plant, the start-up mark is not allowed;

[0044] When the given value is lower than the upper limit of the active power adjustment of the whole plant after stopping one unit, the shutdown mark is not allowed to be activated.

[0045] Furthermore, the preset value M ranges from 5 to 15 MW.

[0046] Furthermore, the preset threshold value of the active power change of the single-controlled unit A or B is 15MW.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The present invention increases the flexibility and adjustability of the system response by adding status point marks (such as start-up marks and shutdown marks) and limiting their input based on preset conditions, so that the units can flexibly join or exit AGC joint control; at the same time, by dynamically adjusting the amplification factor β of the active power change, the system response speed and stability can be further balanced to meet the needs under different working conditions. In the process of crossing the vibration zone, the present invention realizes the optimal allocation of energy by redistributing the total active power change, taking into account the current operating status and adjustment capabilities of other units. This helps to improve the overall operating efficiency of the system and reduce energy waste; the method of the present invention helps to reduce the potential risks caused by system failures or improper operation, and ensure the long-term stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 The present invention is a flow chart of a method for a giant hydroelectric generator set AGC to quickly cross a vibration zone. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] like Figure 1 As shown, it is a flow chart of a method for a giant hydroelectric generator AGC to quickly pass through a vibration zone of the present invention, and the method comprises the following steps:

[0052] Step 1: add a status point mark to each unit, wherein the status point mark includes a start-up mark and a stop-up mark, and the input of the start-up mark and the stop-up mark is limited based on preset conditions.

[0053] The startup flag is activated after the unit is started and connected to the grid to allow the unit to join the AGC joint control; the shutdown flag state point is activated when the unit needs to shut down for load reduction and has joined the AGC joint control.

[0054] The limiting input of the start-up sign and the stop sign based on the preset conditions includes:

[0055] When the AGC of the whole plant is not put into operation, it is not allowed to put the start-up sign or the shutdown sign into operation; when the unit is not in the grid-connected state, it is not allowed to put the start-up sign or the shutdown sign into operation; when the actual active power generated by the unit is in the stable zone, it is not allowed to put the start-up sign into operation; when the unit is not added to the AGC, it is not allowed to put the shutdown sign into operation; when the unit is not operating in the stable zone, it is not allowed to put the shutdown sign into operation.

[0056] The limiting of the input of the start-up mark and the shutdown mark based on preset conditions also includes: when the given value is lower than the lower limit of the adjustable active power of the whole plant, the start-up mark is not allowed to be input; when the given value is lower than the upper limit of the adjustable active power of the whole plant after stopping one unit, the shutdown mark is not allowed to be input.

[0057] Step 2, determine the adjustment action that the hydropower unit needs to perform, the adjustment action is the adjustment through the vibration zone after the new unit is started up and connected to the grid or the adjustment through the vibration zone during the shutdown and load reduction process, and complete the automatic adjustment through the vibration zone based on the adjustment action that needs to be performed.

[0058] When the adjustment action is the vibration zone crossing adjustment after the newly started grid-connected unit, for the newly started grid-connected unit A, if the start-up mark is put into operation and the AGC is added, the AGC performs the following processing:

[0059] Unit A is listed as adjustable under AGC joint control, but when calculating the total active power of AGC joint control, unit A is treated as a single-controlled unit; unit A increases its active power at preset time intervals and steps, and when the set active power value of the entire plant changes or the active power change of unit A exceeds the preset threshold, the AGC redistributes the active power among other units; when the actual active power of unit A increases to the upper edge of the vibration zone minus the preset value, the startup mark is exited, ending the adjustment process after startup and grid connection.

[0060] When the adjustment action is the vibration zone crossing adjustment during the shutdown and load shedding process, for the B unit that needs to be shut down and load shedding, if the unit is in the AGC joint control adjustable state, after the shutdown mark is put into operation, the AGC performs the following processing:

[0061] Unit B is listed as adjustable for AGC joint control, but when calculating the total active power of AGC joint control, unit B is treated as a single-control unit. Unit B reduces its active power at preset time intervals and steps. When the set value of the active power of the entire plant changes or the active power change of unit B exceeds the preset threshold, the AGC redistributes the active power among other units. When the actual active power of unit B is reduced to the lower edge of the vibration zone plus the preset value, the shutdown sign is exited, and the shutdown and load reduction adjustment process ends. The preset value M ranges from 5 to 15MW; the preset threshold for the active power change of single-control units A or B can be 15MW.

[0062] The A unit increases the active power at a preset time interval and step length, and the B unit reduces the active power at a preset time interval and step length. The preset time interval T and step length P satisfy the formula:

[0063] T=k1*Δt;P=k2*P base ;

[0064] Wherein, Δt is the preset basic time interval, 20s≤Δt≤30s; k1 is the adjustment coefficient of the time interval, 1≤k1≤5; P baseis the basic step size, determined based on the rated power of the unit and the range of the vibration zone, P base ≤30MW / 10S; k2 is the step size adjustment coefficient, 1≤k2.

[0065] The calculation method of the preset time interval adjustment coefficient k1 and step size adjustment coefficient k2 is:

[0066] k1=f(ΔPsystem,Δfsystem)=0.01ΔPsystem+0.5Δfsystem+a

[0067] k2=f(ΔPsystem,Δfsystem,ΔTsystem)=0.02ΔPsyatem-0.2Δfaystem+0.1ln(ΔTsystem+1)+b;

[0068] Among them, ΔPsystem is the change of system active power, Δfsystem is the change of system frequency, ΔTsystem is the system time constant, and a and b are constants.

[0069] When the actual active power of unit A increases to the upper edge of the vibration zone minus the preset value, the start-up mark is exited, and when the actual active power of unit B decreases to the lower edge of the vibration zone plus the preset value, the shutdown mark is exited. The preset value M satisfies the formula:

[0070]

[0071] Among them, α is the adjustment factor of the preset value, which is used to set the margin of the exit start-stop flag; P max is the rated power of the unit; is the power value at the upper or lower edge of the vibration zone. When the unit is A unit, Take the power value of the upper edge of the vibration zone. When the unit is unit B, Take the power value at the lower edge of the vibration zone.

[0072] When the active power given value of the whole plant changes and the active power change of single-control unit A or B exceeds the preset threshold, the AGC redistributes the active power, and the total active power change of the redistribution satisfies:

[0073] ΔP total =ΔP change *β+ΔP redistribution

[0074] Where ΔP total is the total active power change redistributed; ΔP change It is the maximum value of the change in the active power given value of the whole plant or the change in the active power of a single controlled unit; β is the amplification factor of the active power change, which is used to adjust the response speed of redistribution; ΔP redistributionIt is the change in active power that is redistributed based on the current operating status and regulation capabilities of other units.

[0075] The method also includes a fault handling method for the start-stop mark state point; when an abnormality or fault occurs in the start-stop mark state point, the start-stop process of the current unit is stopped and the abnormal or faulty start-stop mark state point is exited, an alarm is issued and an operator is notified to perform manual intervention.

[0076] Taking the maximum adjustable active power of the unit as 700MW as an example, 0-400MW is the vibration zone, 400MW is the lower limit of the adjustable active power, and 700MW is the upper limit of the adjustable active power. In actual operation, the present invention first adds a start-up mark state point and a shutdown mark state point for each unit. When a new unit needs to be started and connected to the grid, the AGC of the whole plant is first checked. If the AGC of the whole plant is in the put-in-place state, the grid-connected state of the unit to be started is checked. If it is in the grid-connected state, the unit operation area is checked. If it is running in the vibration zone, the active given value of the whole plant is checked. If the given value exceeds the preset value of the lower limit of the active power adjustable of the whole plant (this preset value can be set, such as 50MW), the start-up mark is put into operation, indicating that the AGC joint control can be added. If one item does not meet the requirements, the start-up mark will not be put into operation.

[0077] When the current unit needs to be shut down for load shedding, first check the AGC of the whole plant. If the AGC of the whole plant is in the state of being put into operation, check the grid-connected state of the unit to be started. If it is in the grid-connected state, check the unit operation area. If it is running in the stable area, check the active power given value of the whole plant. If the given value is lower than the preset upper limit of the active power of the whole plant after shutdown (this preset value can be set, such as 50MW), the shutdown sign is put into operation, indicating that the shutdown can be carried out for load shedding. If one item does not meet the requirements, the shutdown sign will not be put into operation.

[0078] If the current unit is put into the start-up mark and AGC is added, the AGC will list the unit as adjustable for joint control. However, when calculating the total active power of AGC joint control, the AGC will treat the unit as a single-control unit, and the unit will increase its active power in steps of 60MW / 20S. When the active power given value of the whole plant changes, or the active power of the unit changes by more than the preset value, such as 15MW, the AGC will redistribute the active power among the remaining units. Until the actual active power of the unit increases to the upper edge of the vibration zone minus the preset value, such as 10MW, the start-up mark is exited, and the adjustment process after startup and grid connection is ended.

[0079] If the current unit is put into shutdown sign and AGC is added, AGC will list the unit as adjustable for joint control. However, when calculating the total active power of AGC joint control, AGC will treat the unit as a single control unit, and the unit will reduce active power in steps of 60MW / 20S. When the active power given value of the whole plant changes, or the active power change of the unit exceeds the preset value, such as 15MW, AGC will redistribute the active power among the remaining units. Until the actual active power of the unit is reduced to the lower edge of the vibration zone plus the preset value, such as 10MW, the shutdown sign is exited and the shutdown load reduction adjustment process is ended.

[0080] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for a giant hydroelectric unit AGC to quickly pass through a vibration zone, characterized in that: The method comprises the following steps: Step 1, adding a status point mark to each unit, wherein the status point mark includes a start mark and a stop mark, and limiting the input of the start mark and the stop mark based on preset conditions; The startup flag is activated after the unit is started and connected to the grid to allow the unit to join the AGC joint control; the shutdown flag state point is activated when the unit needs to be shut down for load reduction and has joined the AGC joint control; The limiting input of the start-up sign and the stop sign based on the preset conditions includes: When the whole plant AGC is not put into operation, it is not allowed to put into operation the start sign or the stop sign; When the unit is not in grid-connected state, it is not allowed to put the start-up sign or shutdown sign into operation; When the actual active power generated by the unit is in the stable zone, the start-up mark is not allowed to be activated; When the unit is not connected to AGC, it is not allowed to put the shutdown sign into operation; When the unit is not running in the stable zone, it is not allowed to put the shutdown sign into operation; Step 2, determining the adjustment action that the hydropower unit needs to perform, wherein the adjustment action is the adjustment of crossing the vibration zone after the new unit is started up and connected to the grid or the adjustment of crossing the vibration zone during the shutdown and load shedding process, and completing the automatic adjustment of crossing the vibration zone based on the adjustment action that needs to be performed; When the adjustment action is the vibration zone crossing adjustment after the newly started grid-connected unit, for the newly started grid-connected unit A, if the start-up mark is put into operation and the AGC is added, the AGC performs the following processing: Unit A is listed as adjustable under AGC joint control, but when calculating the total active power of AGC joint control, unit A is treated as a single-control unit; Unit A increases its active power at a preset time interval and step size. When the active power setpoint of the entire plant changes or the active power change of unit A exceeds the preset threshold, the AGC redistributes the active power among other units. When the actual active power of unit A increases to the upper edge of the vibration zone minus the preset value, the startup mark is exited, and the adjustment process after startup and grid connection is ended; When the adjustment action is the vibration zone crossing adjustment during the shutdown and load shedding process, for the B unit that needs to be shut down and load shedding, if the unit is in the AGC joint control adjustable state, after the shutdown mark is put into operation, the AGC performs the following processing: Unit B is listed as adjustable under AGC joint control, but when calculating the total active power of AGC joint control, unit B is treated as a single-control unit; Unit B reduces its active power at preset time intervals and step sizes. When the set value of the plant's active power changes or the active power change of unit B exceeds the preset threshold, the AGC redistributes the active power among other units. When the active power of unit B is reduced to the lower edge of the vibration zone plus the preset value, the shutdown sign is exited and the shutdown and load reduction adjustment process ends; The A unit increases the active power at a preset time interval and step length, and the B unit reduces the active power at a preset time interval and step length. The preset time interval T and step length P satisfy the formula: T=k1*Δt;P=k2*P base ; Wherein, Δt is the preset basic time interval, 20s≤Δt≤30s; k1 is the adjustment coefficient of the time interval, 1≤k1≤5; P base is the basic step size, determined based on the rated power of the unit and the range of the vibration zone, P base ≤30MW / 10S; k2 is the adjustment coefficient of the step length, 1≤k2; The calculation method of the preset time interval adjustment coefficient k1 and step size adjustment coefficient k2 is: k1=f(ΔPsystem,Δfsystem)=0.01ΔPsystem+0.5Δfsystem+a k2=f(ΔPsystem,Δfsystem,ΔTsystem)= 0.02ΔPsystem-0.2Δfsystem+0.1ln(ΔTsystem+1)+b; Among them, ΔPsystem is the change of system active power, Δfsystem is the change of system frequency, ΔTsystem is the system time constant, and a and b are constants.

2. A method for a giant hydroelectric unit AGC to quickly pass through a vibration zone according to claim 1, characterized in that: When the actual active power of unit A increases to the upper edge of the vibration zone minus the preset value, the start-up mark is exited, and when the actual active power of unit B decreases to the lower edge of the vibration zone plus the preset value, the shutdown mark is exited. The preset value M satisfies the formula: Among them, α is the adjustment factor of the preset value, which is used to set the margin of the exit start-stop flag; P max is the rated power of the unit; is the power value at the upper or lower edge of the vibration zone. When the unit is A unit, Take the power value of the upper edge of the vibration zone. When the unit is unit B, Take the power value at the lower edge of the vibration zone.

3. A method for a giant hydroelectric unit AGC to quickly pass through a vibration zone according to claim 2, characterized in that: When the active power given value of the whole plant changes and the active power change of single-control unit A or B exceeds the preset threshold, the AGC redistributes the active power, and the total active power change of the redistribution satisfies: ΔP total =ΔP change *β+ΔP redistribution Among them, ΔP total is the total active power change redistributed; ΔP change It is the maximum value of the change in the active power given value of the whole plant or the change in the active power of a single controlled unit; β is the amplification factor of the active power change, which is used to adjust the response speed of redistribution; ΔP redistribution It is the change in active power that is redistributed based on the current operating status and regulation capabilities of other units.

4. A method for a giant hydroelectric unit AGC to quickly pass through a vibration zone according to claim 3, characterized in that: The method also includes a fault handling method for the open shutdown mark state point; When an abnormality or fault occurs in the start / stop mark status point, the start / stop process of the current unit is stopped and the abnormal or faulty start / stop mark status point is exited, an alarm is issued and the operator is notified to perform manual intervention.

5. A method for a giant hydroelectric unit AGC to quickly pass through a vibration zone according to any one of claims 1-2, characterized in that: The input of limiting the start-up sign and the shutdown sign based on the preset conditions also includes: When the given value is lower than the lower limit of the active power adjustment of the whole plant, the start-up mark is not allowed; When the given value is lower than the upper limit of the active power adjustable in the whole plant after stopping one unit, the shutdown mark is not allowed to be activated.

6. A method for a giant hydroelectric unit AGC to quickly pass through a vibration zone according to claim 5, characterized in that: The preset value M ranges from 5 to 15 MW.

7. A method for a giant hydroelectric generator AGC to quickly pass through a vibration zone according to claim 6, characterized in that: The preset threshold value of active power change of single-controlled unit A or B is 15MW.

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