CN114243757B - Hydropower station AGC control system and hydropower station AGC control method in automatic mode - Google Patents
Hydropower station AGC control system and hydropower station AGC control method in automatic mode Download PDFInfo
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- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
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- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
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Abstract
The application discloses a hydropower station AGC control system and method under an automatic mode in the technical field of hydropower station AGC control, comprising the following steps: obtaining a planning point value of a load planning curve corresponding to each early start-stop time in a period; based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time, carrying out combined calculation to obtain the number of units needing starting and stopping in the time period; selecting a unit to start and stop in advance based on the planning point value of the load planning curve corresponding to each time of starting and stopping in advance; after the unit starts and stops in advance, executing a unit start and stop process according to a load planning curve slope smooth start and stop mode; in response to the start-stop process of the unit, performing cooperative control with primary frequency modulation action; and when the machine set start-up and shutdown process is abnormal, switching to a corresponding abnormal processing process. The application can improve the automatic power generation control level of the unit of the hydropower station, and further improve the guarantee effect of the hydropower station on the safe and stable operation of the power grid.
Description
Technical Field
The application relates to a hydropower station AGC control system and method in an automatic mode, and belongs to the technical field of hydropower station AGC control.
Background
AGC is widely applied to the field of hydropower station control, but when a unit needs to be started or stopped at present, corresponding control flows are started by operators on duty, and after the unit is connected or disconnected, load distribution among the units is completed by the AGC according to the current unit combination. The process does not realize the automatic mode of AGC, and for the reason, the automatic start-stop group needs to have an advance time, the start-stop process needs to lighten the impact on a power grid, the start-stop process needs to be in coordination with the frequency control, and the abnormal start-stop process needs to have reliable countermeasures. Only if the problems are effectively solved, the reliability of the generating control of the hydroelectric generating set in an automatic mode can be ensured.
The application patent 202010886387.0 discloses an on-off strategy matrix model capable of meeting the active power of a power station, wherein the matrix model is based on the running states of all units which are put into intelligent on-off at present under the condition of definitely participating in all parameters of the intelligent on-off hydropower station, and the running condition after the on-off state of one unit is changed is used as an on-off strategy; aiming at the current mode and different startup and shutdown strategies, an intelligent startup and shutdown matrix model Sj of 2 rows and n+1 columns is established, and a circulation operation mode is adopted for all the participating units to judge whether to perform intelligent startup and shutdown. The hydropower station is applicable to hydropower stations of different types of hydropower stations including conventional types of units, single-proposal operation area units and double-proposal operation area units; generating a start-stop strategy on the matrix model, and carrying out auxiliary prompt on an operator or automatically generating a start-stop instruction; therefore, the difference of unit types does not form an application obstacle any more, and the application has wide applicability.
The prior art focuses on the problems of the number of units, the combination of the units and the priority of the units in the starting and stopping process, and the reliability technology of the starting and stopping process control is not researched. The existing AGC and primary frequency modulation cooperative control strategy cannot be suitable for the slope smooth start-stop process of a load planning curve.
The application aims at firstly selecting a unit to start or stop in advance, executing the unit start-up or stop process according to a load plan curve slope smooth start-stop mode, and balancing the influence of the start-stop process on a power grid and a power station; secondly, the control is coordinated with the primary frequency modulation to ensure the normal exertion of the primary frequency modulation effect; finally, the refinement treatment of the automatic start-stop abnormality is realized. The automatic power generation control level of the unit of the hydropower station is improved, and the guarantee effect of the hydropower station on the safe and stable operation of the power grid is further improved.
Disclosure of Invention
The application aims to overcome the defects in the prior art and provides a hydropower station AGC control system and method in an automatic mode.
In order to achieve the above purpose, the application is realized by adopting the following technical scheme:
in a first aspect, the present application provides a hydropower station AGC control method in an automatic mode, including:
obtaining a planning point value of a load planning curve corresponding to each early start-stop time in a period;
based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time, carrying out combined calculation to obtain the number of units needing starting and stopping in the time period;
selecting a unit to start and stop in advance based on the planning point value of the load planning curve corresponding to each time of starting and stopping in advance;
after the unit starts and stops in advance, executing a unit start and stop process according to a load planning curve slope smooth start and stop mode;
in response to the start-stop process of the unit, performing cooperative control with primary frequency modulation action;
and when the machine set start-up and shutdown process is abnormal, switching to a corresponding abnormal processing process.
Further, based on the planning point value of the load planning curve corresponding to each early start time, the early start of the unit is selected, including:
storing the planning point value of the load planning curve corresponding to each early starting time into Pgen [ ] array;
storing the effective execution value of the Pgen [ ] array into the Pgen_old [ ] array;
when the number of units needed to be started in the response time period is n >0, a loop body with the execution times of n is established, and the method comprises the following steps:
judging the size between Pgen [ i ] and Pgen_old [ i ], wherein i is an advanced starting time sequence number;
in response to Pgen [ i ] =pgen_old [ i ], no processing is performed;
in response to Pgen [ i ] noteqpgen_old [ i ], executing a unit boot flow of a corresponding priority, including:
when the machine set starting flow is not successfully executed, the corresponding Pgen_old [ i ] is restored to the original value;
in response to the existence of the manual power-on process and the successful power-on, assigning the value of the period Pgen [ ] array to the Pgen_old [ ] array;
based on the planned point value of the load planned curve corresponding to each advanced shutdown time, selecting the machine set to be stopped in advance comprises the following steps:
storing the planning point values of the load planning curves corresponding to the early shutdown time into a Pstop [ ] array;
storing the valid execution value of the Pstop [ ] array into the Pstop_old [ ] array;
when the number of units needed to be stopped in the time period is greater than 0, a loop body with the execution times of n is established, and the method comprises the following steps:
judging the size between Pstop [ i ] and Pstop_old [ i ], wherein i is an advanced downtime sequence number;
in response to Pstop [ i ] =pstop_old [ i ], no processing is performed;
in response to Pstop [ i ] +.pstop_old [ i ], executing a unit shutdown procedure of a corresponding priority, including:
responding to unsuccessful execution of a machine set shutdown flow, and restoring the corresponding Pstop_old [ i ] to an original value;
in response to the existence of the manual shutdown process and the shutdown success, the value of the time period Pstop [ ] array is assigned to the Pstop_old [ ] array.
Further, after the unit is started in advance, executing the unit starting process according to a load planning curve slope smooth start-stop mode, including:
the starting machine set is connected with a network, and the machine set base load is automatically carried;
selecting a unit with highest shutdown priority to synchronously down-regulate power;
after the power of one unit with the largest up-regulating active margin is selected every minute, judging whether the power reaches the planned point value of the period;
the power up-regulation is ended in response to reaching the planned point value for the period.
Further, in response to the unit stopping in advance, executing the unit stopping process according to a load planning curve slope smooth start-stop mode, including:
the unit with the highest shutdown priority is selected to adjust the power downwards every minute until the unit base load is reached;
selecting a unit with the second highest shutdown priority to lower power when the shutdown advanced time is not reached;
and responding to the shutdown disconnection of the unit with the highest shutdown priority when the shutdown advanced time is reached, and synchronously up-regulating the power of other units.
Further, in response to the machine start-up and shutdown process, the cooperative control with the primary frequency modulation action comprises:
responding to the constant time period of the load planning curve and not executing any operation in the primary frequency modulation action process;
locking start-up operation in response to a load planning curve in a start-up and stop period and in the primary frequency modulation high-frequency action process;
in response to a load planning curve, starting and stopping a period of time and in the primary frequency modulation low-frequency action process, locking and unloading operation and stopping operation;
in response to a load planning curve changing period and in the primary frequency modulation high-frequency action process, locking a load increasing operation, smoothly obtaining a power station active power set value according to the slope of the load planning curve during a load decreasing operation, superposing the power station active power set value with output adjustment caused by primary frequency modulation, and replacing the original active power set value with the superposed set value;
in response to a load planning curve changing period and in the primary frequency modulation low-frequency action process, locking and reducing load operation, smoothly obtaining a power station active power set value according to the slope of the load planning curve during load increasing operation, superposing the power station active power set value with output adjustment caused by primary frequency modulation, and replacing the original active power set value with the superposed set value;
and responding to the load planning curve to change the load period and automatically unlocking after the primary frequency modulation action signal is reset and the load operation locking signal is kept for a preset time, so as to restore the corresponding load increasing and decreasing operation.
Further, when the starting process of the unit is abnormal, the corresponding abnormal processing process is shifted to, and the method comprises the following steps:
responding to a machine set under a stop working condition, and taking a machine set starting condition as a necessary condition for AGC investment of the machine set;
setting a starting process mark and a stopping process mark parameter in a unit starting process to judge the starting grid connection failure, wherein the method comprises the following steps:
responding to the AGC control, when the LCU of the unit does not return the signal marked by the starting process after the starting command is sent out and within the preset time, the starting grid connection fails, namely, the suspended process is carried out, the starting process mark is reset, but the unit does not reach the grid connection state, when the starting grid connection fails, namely, the shutdown process is automatically turned, and the LCU of the unit returns the signal marked by the shutdown process of the unit, the unit is warned, prompted and other units are automatically selected to start.
Further, when the shutdown process of the unit is abnormal, the corresponding abnormal processing process is shifted to, including:
responding to a unit under a power generation working condition, and taking a unit shutdown condition which does not meet the unit shutdown condition as an important subtraction item of the unit shutdown priority;
setting a shutdown process marking parameter in a unit shutdown process to judge shutdown failure, including:
responding to the AGC control to send out a signal of stopping process mark after stopping command and in a preset time, alarming and prompting and automatically selecting other units to stop;
and in response to the blocking of the shutdown process, automatically switching the unit to an emergency shutdown process.
In a second aspect, the present application provides a hydropower station AGC control system in an automatic mode, comprising:
the planning point value acquisition module: the method comprises the steps of acquiring a planning point value of a load planning curve corresponding to each early start-stop time in a period;
the starting and stopping machine set number determining module is used for carrying out combination calculation based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time to obtain the machine set number needing starting and stopping in the time period;
and (5) starting and stopping the machine in advance: the method comprises the steps of selecting a unit to start and stop in advance based on a planning point value of a load planning curve corresponding to each time of starting and stopping in advance;
and (5) starting and stopping the machine module: the method comprises the steps of responding to the start and stop of a unit in advance, and executing the start and stop process of the unit according to a load planning curve slope smooth start and stop mode;
and the cooperative connection control module is used for: the control device is used for performing cooperative control with primary frequency modulation action in response to the startup and shutdown process of the unit;
an exception handling module: and the method is used for responding to the abnormality of the machine start-stop process and switching to a corresponding abnormality processing process.
In a third aspect, the present application provides a hydropower station AGC control device in an automatic mode, including a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is operative according to the instructions to perform the steps of the method according to any one of the preceding claims.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.
Compared with the prior art, the application has the beneficial effects that:
the application can realize the early start-stop of the load planning curve in the slope smooth start-stop mode, balance the influence of the start-stop process on the power grid and the power station, and realize the optimization of source network coordination. And secondly, the system can be controlled in a coordinated manner with primary frequency modulation, and the supporting effect of the hydroelectric generating set on the large-scale resource optimal allocation and safe operation of the power grid is fully exerted. Finally, the method can realize the fine treatment of the abnormality of the automatic start-stop machine and provide reliable guarantee for the power generation control of the hydroelectric generating set in an automatic mode. The application solves a series of problems in the automatic start-stop process, effectively improves the power and load qualification rate of the start-stop components, reduces the operation workload of operators, improves the automatic power generation control level of the unit of the hydropower station, and further improves the guarantee effect of the hydropower station on the safe and stable operation of the power grid.
Drawings
FIG. 1 is a flow chart of a hydropower station AGC control method in an automatic mode according to a first embodiment of the present application;
FIG. 2 is a flow chart of an early start-up and shutdown provided in accordance with an embodiment of the present application;
FIG. 3 is a flowchart of a load planning curve slope smoothing start-stop mode according to an embodiment of the present application.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
Embodiment one:
referring to fig. 1, the hydropower station AGC control method in the automatic mode includes the following steps:
step 1, obtaining a planning point value of a load planning curve corresponding to each early start-stop time in a period;
step 2, carrying out combined calculation based on the planning point values of the load planning curve corresponding to the first early start-stop time to obtain the number of units needing to be started and stopped in the period;
step 3, selecting a unit to start and stop in advance based on the planning point value of the load planning curve corresponding to each time of starting and stopping in advance;
step 4, executing the starting or stopping process of the unit according to a slope smooth starting and stopping mode of a load planning curve after the unit starts and stops in advance;
step 5, in the starting or stopping process of the unit, the unit is controlled in a coordinated manner with the primary frequency modulation;
and step 6, if the starting or stopping process of the unit is abnormal, transferring to corresponding abnormal processing.
In the automatic mode, when the next planning point (one planning point every 15 minutes) needs to start or stop a plurality of units, in order to prevent the impact on the power grid caused by the start-stop process, the units are usually arranged to start or stop sequentially at intervals in advance. The number of start-stop machine groups with a change of a planned point is generally not more than 3. The specific algorithm flow is shown in fig. 2. In step 3, based on the planned point value of the load planned curve corresponding to each early start time, the process of selecting the unit to start in advance may be:
31 Storing the planned point values of the load planning curve corresponding to each advanced starting time in the period into a Pgen [ ] array, for example, if the advanced starting time of one period is 14 minutes, 10 minutes and 6 minutes respectively, pgen [0] is the planned point value corresponding to 14 minutes in advance, pgen [1] is the planned point value corresponding to 10 minutes in advance, and Pgen [2] is the planned point value corresponding to 6 minutes in advance;
32 The effective execution value of Pgen [ ] array is stored in Pgen_old [ ] array, for example, after the unit with the first starting priority in the current period starts up according to the execution of Pgen [0], the value of Pgen [0] is stored in Pgen_old [0]; after the unit with the second starting priority in the current period starts according to the Pgen [1], the value of the Pgen [1] is stored into the Pgen_old [1]; after the machine set with the third starting priority in the current period starts according to the Pgen [2], the value of the Pgen [2] is stored into the Pgen_old [2];
33 When the number of the machine sets needed to be started in the period is n >0, a loop body with the execution times of n is established, and in the loop body, if Pgen [ i ] notequal to Pgen_old [ i ], a machine set starting flow with the corresponding priority is executed, wherein i is a starting or stopping time sequence in advance, and when i=0, the machine set with the first starting priority in the current period executes the starting flow; when i=1, executing a starting flow by a unit with a second starting priority in the current period; when i=2, executing a starting-up flow by the unit with the third starting-up priority in the current period, and if Pgen [ i ] =pgen_old [ i ], not performing any processing;
34 If the machine set starting-up flow is not successfully executed, the corresponding Pgen_old [ i ] is restored to the original value;
35 If there is a manual power-on process, after the power-on is successful, the value of the period Pgen [ ] array is assigned to the Pgen_old [ ] array. It should be noted that Pgen_old [ i ] is an important reference for whether to start up or not, and the processing of synchronizing with Pgen [ i ] or restoring the original value can ensure the validity of Pgen_old [ i ] as a reference.
In the same way, based on the planning point value of the load planning curve corresponding to each advanced shutdown time, the process of selecting the machine set to shutdown in advance can be as follows:
36 Storing the planned point values of the load planning curve corresponding to each advanced downtime in the period into a Pstop [ ] array;
37 A valid execution value of the Pstop [ ] array, and storing the Pstop_old [ ] array;
38 When the number of machine sets to be stopped in the period is n >0, a loop body with the execution times of n is established. If Pstop [ i ] notequal to pstop_old [ i ], executing the unit shutdown flow with the corresponding priority, including: judging the size between Pstop [ i ] and Pstop_old [ i ], wherein i is an advanced downtime sequence number; in response to Pstop [ i ] =
Pstop_old [ i ], no processing is performed; executing a unit shutdown procedure of corresponding priority in response to Pstop [ i ] +.;
39 If the machine set shutdown flow is not successfully executed, the corresponding Pstop_old [ i ] is restored to the original value;
3a) If the manual shutdown process exists, after the shutdown is successful, the value of the time period Pstop [ ] array is assigned to the Pstop_old [ ] array.
On the basis of the early start and stop of the generator set, the smooth start and stop process of the generator set according to the 96-point slope of the load planning curve is further realized, and the smooth start and stop stage should avoid the vibration area of the generator set. The specific algorithm flow is shown in fig. 3, and after the unit is started in advance in step 4, the unit starting process can be executed according to the load planning curve slope smooth start-stop mode:
41 The power station active power set value obtained smoothly according to the slope of a load plan curve is uniformly and monotonically increased, the power station active power set value exceeds the set value after the power station unit carries the unit base load, and other unit power callback is needed to enable the total active power of the power station to be consistent with the set value; the unit power callback should select as few unit actions as possible, and the unit power callback with the highest shutdown priority is selected according to the technical scheme; the active power set value of the power station continues to uniformly and monotonically increase in the next minute, at the moment, one unit is selected from the starting-up units or the power callback units to adjust power upwards, and the space for adjusting the power upwards is large, namely the up-adjustment active margin is large, and the unit is selected;
42 Selecting the synchronous power down of the unit with the highest shutdown priority;
43 After that, the unit with the largest up-regulating active margin is selected to up-regulate power every minute;
44 Until the planned point value of the period is reached, the power up-regulation is ended, and it is noted that the planned point value of the period is reached, that is, the final control target of the period is reached, and the control is ended.
After the machine set is stopped in advance, the machine set stopping process can be executed according to a load planning curve slope smooth start-stop mode, and the machine set stopping process can be as follows:
45 Selecting a unit with the highest shutdown priority per minute to adjust power downwards until the unit base load is reached;
46 If the shutdown advanced time is not reached, selecting a unit with the second highest shutdown priority to adjust the power downwards, and so on;
47 If the shutdown advanced time is reached, the unit with the highest shutdown priority is shutdown and disconnected, and other units synchronously up-regulate power.
In the smooth start-stop mode of the slope of the load planning curve, the set value of the active power of the power station changes every minute, and the cooperation with primary frequency modulation is mainly considered to ensure the normal exertion of the primary frequency modulation. In the starting or stopping process of the unit in the step 5, the process of cooperative control with primary frequency modulation can be as follows:
51 During the primary frequency modulation action, the control output of the AGC start-up instruction or stop instruction or load distribution value is not changed, and no operation is executed;
52 The startup and shutdown period of the load planning curve is closed in the primary frequency modulation high-frequency action process, and the shutdown process is not influenced. In the primary frequency modulation low-frequency action process, locking load-reducing operation and stopping operation, and starting up process is not affected;
53 During the load planning curve load changing period, locking the load increasing operation and the load reducing operation, the active power set value of the power station is obtained smoothly according to the slope of the load planning curve, and is overlapped with the output adjustment caused by primary frequency modulation, and the overlapped set value is used for replacing the original active power set value. And in the primary frequency modulation low-frequency action process, locking and load reduction operation, smoothly obtaining the set value of the active power of the power station according to the slope of a load planning curve during load increase operation, superposing the set value with the output adjustment caused by primary frequency modulation, and replacing the original set value of the active power with the superposed set value. After the primary frequency modulation action signal is reset, the load operation locking signal is automatically unlocked after being kept for a preset time, the corresponding load increasing and decreasing operation is recovered, and the preset time is set to be 1 minute.
The success rate of the start-stop of the hydroelectric generating set is an important index for the reliable operation of the hydropower station, and is an important technical condition for AGC control in an automatic mode. For the AGC control process, the reasons for the unsuccessful automatic start-stop include two major categories, control instruction loss and control process execution blocking. The loss of the control instruction means that the AGC control sends out an on-off instruction, but the unit LCU does not execute the corresponding on-off process. Control process execution blocking is classified into startup process blocking and shutdown process blocking. The machine set cannot be connected successfully due to synchronous failure, excitation failure and other reasons, and the starting process is blocked; the shutdown process is blocked because the unit cannot be disconnected successfully due to the reasons of load reduction failure, failure of normal opening of the outlet switch and the like. In step 6, if the starting process of the unit is abnormal, the corresponding abnormal processing process is transferred into:
61 For a unit under a stop working condition, taking the starting condition of the unit as a necessary condition for AGC input of the unit;
62 Setting the start-up process flag and the stop process flag parameters, which are set in the unit start-up flow, as the judgment conditions of the following steps 63) and 64). The AGC controls to give out a signal of a starting process mark when the unit LCU does not return after starting, alarming and prompting and automatically selecting other units to start, wherein the preset time is set to be 15 seconds;
63 For the suspended process when the startup grid connection fails, the startup process marks are reset, but when the machine set does not reach the grid connection state, the machine set is warned and the other machine sets are automatically selected to start;
64 For the process of automatic turning to stop when the startup and grid connection fails, the unit LCU gives an alarm and prompts and automatically selects other units to start up when the unit LCU returns a signal marked in the unit stop process.
If the shutdown process of the unit is abnormal, the corresponding abnormal processing process is carried out:
65 For a unit under a power generation working condition, taking the unit shutdown condition which is not met as an important subtraction item of the unit shutdown priority;
66 The shutdown process marking parameters are set, and the parameters are set in the shutdown process of the unit and serve as judging conditions of the following steps. In the preset time after the AGC control sends out the stop command, when the unit LCU does not return a signal marked in the stop process, the unit LCU gives an alarm to prompt and automatically selects other units to stop, and the preset time is set to be 15 seconds;
67 If the shutdown process is blocked, the unit automatically changes into an emergency shutdown process.
Embodiment two:
a hydropower station AGC control system in an automatic mode can realize a hydropower station AGC control method in the automatic mode in the first embodiment, which comprises the following steps:
the planning point value acquisition module: the method comprises the steps of acquiring a planning point value of a load planning curve corresponding to each early start-stop time in a period;
the starting and stopping machine set number determining module is used for carrying out combination calculation based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time to obtain the machine set number needing starting and stopping in the time period;
and (5) starting and stopping the machine in advance: the method comprises the steps of selecting a unit to start and stop in advance based on a planning point value of a load planning curve corresponding to each time of starting and stopping in advance;
and (5) starting and stopping the machine module: the method comprises the steps of responding to the start and stop of a unit in advance, and executing the start and stop process of the unit according to a load planning curve slope smooth start and stop mode;
and the cooperative connection control module is used for: the control device is used for performing cooperative control with primary frequency modulation action in response to the startup and shutdown process of the unit;
an exception handling module: and the method is used for responding to the abnormality of the machine start-stop process and switching to a corresponding abnormality processing process.
Embodiment III:
the embodiment of the application also provides a hydropower station AGC control device under the automatic mode, which can realize the hydropower station AGC control method under the automatic mode in the first embodiment, and comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method of:
obtaining a planning point value of a load planning curve corresponding to each early start-stop time in a period;
based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time, carrying out combined calculation to obtain the number of units needing starting and stopping in the time period;
selecting a unit to start and stop in advance based on the planning point value of the load planning curve corresponding to each time of starting and stopping in advance;
after the unit starts and stops in advance, executing a unit start and stop process according to a load planning curve slope smooth start and stop mode;
in response to the start-stop process of the unit, performing cooperative control with primary frequency modulation action;
and when the machine set start-up and shutdown process is abnormal, switching to a corresponding abnormal processing process.
Embodiment four:
the embodiment of the application also provides a computer readable storage medium, which can realize the hydropower station AGC control method in the automatic mode in the first embodiment, and stores a computer program, and the program realizes the following steps when being executed by a processor:
obtaining a planning point value of a load planning curve corresponding to each early start-stop time in a period;
based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time, carrying out combined calculation to obtain the number of units needing starting and stopping in the time period;
selecting a unit to start and stop in advance based on the planning point value of the load planning curve corresponding to each time of starting and stopping in advance;
after the unit starts and stops in advance, executing a unit start and stop process according to a load planning curve slope smooth start and stop mode;
in response to the start-stop process of the unit, performing cooperative control with primary frequency modulation action;
and when the machine set start-up and shutdown process is abnormal, switching to a corresponding abnormal processing process.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present application, and such modifications and variations should also be regarded as being within the scope of the application.
Claims (9)
1. The hydropower station AGC control method in the automatic mode is characterized by comprising the following steps:
obtaining a planning point value of a load planning curve corresponding to each early start-stop time in a period;
based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time, carrying out combined calculation to obtain the number of units needing starting and stopping in the time period;
the method comprises the steps of selecting a unit to start and stop in advance based on the planning point value of a load planning curve corresponding to each start-up and stop time in advance, wherein the method comprises the steps of:
storing the planning point value of the load planning curve corresponding to each early starting time into Pgen [ ] array;
storing the effective execution value of the Pgen [ ] array into the Pgen_old [ ] array;
when the number of units needed to be started in the response time period is n >0, a loop body with the execution times of n is established, and the method comprises the following steps:
judging the size between Pgen [ i ] and Pgen_old [ i ], wherein i is an advanced starting time sequence number;
in response to Pgen [ i ] =pgen_old [ i ], no processing is performed;
in response to Pgen [ i ] noteqpgen_old [ i ], executing a unit boot flow of a corresponding priority, including:
when the machine set starting flow is not successfully executed, the corresponding Pgen_old [ i ] is restored to the original value;
in response to the existence of the manual power-on process and the successful power-on, assigning the value of the period Pgen [ ] array to the Pgen_old [ ] array;
based on the planned point value of the load planned curve corresponding to each advanced shutdown time, selecting the machine set to be stopped in advance comprises the following steps:
storing the planning point values of the load planning curves corresponding to the early shutdown time into a Pstop [ ] array;
storing the valid execution value of the Pstop [ ] array into the Pstop_old [ ] array;
when the number of units needed to be stopped in the time period is greater than 0, a loop body with the execution times of n is established, and the method comprises the following steps:
judging the size between Pstop [ i ] and Pstop_old [ i ], wherein i is an advanced downtime sequence number;
in response to Pstop [ i ] =pstop_old [ i ], no processing is performed;
in response to Pstop [ i ] +.pstop_old [ i ], executing a unit shutdown procedure of a corresponding priority, including:
responding to unsuccessful execution of a machine set shutdown flow, and restoring the corresponding Pstop_old [ i ] to an original value;
assigning a value of the time period Pstop [ ] array to the Pstop_old [ ] array in response to the existence of the manual shutdown process and the success of the shutdown;
after the unit starts and stops in advance, executing a unit start and stop process according to a load planning curve slope smooth start and stop mode;
in response to the start-stop process of the unit, performing cooperative control with primary frequency modulation action;
and when the machine set start-up and shutdown process is abnormal, switching to a corresponding abnormal processing process.
2. The hydropower station AGC control method in an automatic mode according to claim 1, wherein,
after the unit is started in advance, executing the unit starting process according to a load planning curve slope smooth start-stop mode, wherein the method comprises the following steps:
the starting machine set is connected with a network, and the machine set base load is automatically carried;
selecting a unit with highest shutdown priority to synchronously down-regulate power;
after the power of one unit with the largest up-regulating active margin is selected every minute, judging whether the power reaches the planned point value of the period;
the power up-regulation is ended in response to reaching the planned point value for the period.
3. The hydropower station AGC control method in an automatic mode according to claim 1, wherein,
and after the machine set is stopped in advance, executing the machine set stopping process according to a load planning curve slope smooth start-stop mode, wherein the method comprises the following steps of:
the unit with the highest shutdown priority is selected to adjust the power downwards every minute until the unit base load is reached;
selecting a unit with the second highest shutdown priority to lower power when the shutdown advanced time is not reached;
and responding to the shutdown disconnection of the unit with the highest shutdown priority when the shutdown advanced time is reached, and synchronously up-regulating the power of other units.
4. The hydropower station AGC control method in an automatic mode according to claim 1, wherein,
in response to the machine set start-stop process, performing cooperative control with the primary frequency modulation action, including:
responding to the constant time period of the load planning curve and not executing any operation in the primary frequency modulation action process;
locking start-up operation in response to a load planning curve in a start-up and stop period and in the primary frequency modulation high-frequency action process;
in response to a load planning curve, starting and stopping a period of time and in the primary frequency modulation low-frequency action process, locking and unloading operation and stopping operation;
in response to a load planning curve changing period and in the primary frequency modulation high-frequency action process, locking a load increasing operation, smoothly obtaining a power station active power set value according to the slope of the load planning curve during a load decreasing operation, superposing the power station active power set value with output adjustment caused by primary frequency modulation, and replacing the original active power set value with the superposed set value;
in response to a load planning curve changing period and in the primary frequency modulation low-frequency action process, locking and reducing load operation, smoothly obtaining a power station active power set value according to the slope of the load planning curve during load increasing operation, superposing the power station active power set value with output adjustment caused by primary frequency modulation, and replacing the original active power set value with the superposed set value;
and responding to the load planning curve to change the load period and automatically unlocking after the primary frequency modulation action signal is reset and the load operation locking signal is kept for a preset time, so as to restore the corresponding load increasing and decreasing operation.
5. The hydropower station AGC control method in an automatic mode according to claim 1, wherein,
when the starting process of the unit is abnormal, the corresponding abnormal processing process is shifted to, and the method comprises the following steps:
responding to a machine set under a stop working condition, and taking a machine set starting condition as a necessary condition for AGC investment of the machine set;
setting a starting process mark and a stopping process mark parameter in a unit starting process to judge the starting grid connection failure, wherein the method comprises the following steps:
responding to the AGC control, when the LCU of the unit does not return the signal marked by the starting process after the starting command is sent out and within the preset time, the starting grid connection fails, namely, the suspended process is carried out, the starting process mark is reset, but the unit does not reach the grid connection state, when the starting grid connection fails, namely, the shutdown process is automatically turned, and the LCU of the unit returns the signal marked by the shutdown process of the unit, the unit is warned, prompted and other units are automatically selected to start.
6. The hydropower station AGC control method in an automatic mode according to claim 1, wherein,
when the machine unit shutdown process is abnormal, the corresponding abnormal processing process is shifted to, and the method comprises the following steps:
responding to a unit under a power generation working condition, and taking a unit shutdown condition which does not meet the unit shutdown condition as an important subtraction item of the unit shutdown priority;
setting a shutdown process marking parameter in a unit shutdown process to judge shutdown failure, including:
responding to the AGC control to send out a signal of stopping process mark after stopping command and in a preset time, alarming and prompting and automatically selecting other units to stop;
and in response to the blocking of the shutdown process, automatically switching the unit to an emergency shutdown process.
7. A hydropower station AGC control system in an automatic mode, comprising:
the planning point value acquisition module: the method comprises the steps of acquiring a planning point value of a load planning curve corresponding to each early start-stop time in a period;
the starting and stopping machine set number determining module is used for carrying out combination calculation based on the planning point value of the load planning curve corresponding to the first advanced starting and stopping time to obtain the machine set number needing starting and stopping in the time period;
and (5) starting and stopping the machine in advance: the method is used for selecting the unit to start and stop in advance based on the planning point value of the load planning curve corresponding to each early start and stop time, wherein the method for selecting the unit to start in advance based on the planning point value of the load planning curve corresponding to each early start time comprises the following steps:
storing the planning point value of the load planning curve corresponding to each early starting time into Pgen [ ] array;
storing the effective execution value of the Pgen [ ] array into the Pgen_old [ ] array;
when the number of units needed to be started in the response time period is n >0, a loop body with the execution times of n is established, and the method comprises the following steps:
judging the size between Pgen [ i ] and Pgen_old [ i ], wherein i is an advanced starting time sequence number;
in response to Pgen [ i ] =pgen_old [ i ], no processing is performed;
in response to Pgen [ i ] noteqpgen_old [ i ], executing a unit boot flow of a corresponding priority, including:
when the machine set starting flow is not successfully executed, the corresponding Pgen_old [ i ] is restored to the original value;
in response to the existence of the manual power-on process and the successful power-on, assigning the value of the period Pgen [ ] array to the Pgen_old [ ] array;
based on the planned point value of the load planned curve corresponding to each advanced shutdown time, selecting the machine set to be stopped in advance comprises the following steps:
storing the planning point values of the load planning curves corresponding to the early shutdown time into a Pstop [ ] array;
storing the valid execution value of the Pstop [ ] array into the Pstop_old [ ] array;
when the number of units needed to be stopped in the time period is greater than 0, a loop body with the execution times of n is established, and the method comprises the following steps:
judging the size between Pstop [ i ] and Pstop_old [ i ], wherein i is an advanced downtime sequence number;
in response to Pstop [ i ] =pstop_old [ i ], no processing is performed;
in response to Pstop [ i ] +.pstop_old [ i ], executing a unit shutdown procedure of a corresponding priority, including:
responding to unsuccessful execution of a machine set shutdown flow, and restoring the corresponding Pstop_old [ i ] to an original value;
assigning a value of the time period Pstop [ ] array to the Pstop_old [ ] array in response to the existence of the manual shutdown process and the success of the shutdown;
and (5) starting and stopping the machine module: the method comprises the steps of responding to the start and stop of a unit in advance, and executing the start and stop process of the unit according to a load planning curve slope smooth start and stop mode;
and the cooperative connection control module is used for: the control device is used for performing cooperative control with primary frequency modulation action in response to the startup and shutdown process of the unit;
an exception handling module: and the method is used for responding to the abnormality of the machine start-stop process and switching to a corresponding abnormality processing process.
8. The hydropower station AGC control device in an automatic mode is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1 to 6.
9. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1-6.
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