CN106406080B - A kind of long-range optimization system of AGC function and method of thermal power generation unit - Google Patents
A kind of long-range optimization system of AGC function and method of thermal power generation unit Download PDFInfo
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Abstract
The invention discloses the long-range optimization systems of AGC function and method of a kind of thermal power generation unit, which includes PID controller, for controlling the actual negative charge values of thermal power generation unit according to unit load error amount and preset PID controller parameter；The unit load error amount is the difference of AGC load setting value and unit actual negative charge values；Data acquisition device acquires the output valve of unit actual load value, AGC load setting value and PID controller in real time and is sent to remote data center server；Remote data center server is used to establish the first order modeling of thermal power generation unit；Again based on the first order modeling of thermal power generation unit, preset PID controller parameter is adjusted using Internal Model Control Algorithm；The PID controller parameter after adjusting is finally fed back into PID controller；PID controller is also used to control the actual negative charge values of thermal power generation unit according to the PID controller parameter after adjusting, and the final automatic generation for realizing thermal power generation unit remotely controls.
Description
Technical field
The invention belongs to a kind of long-range optimization systems of the AGC function in generating set field more particularly to thermal power generation unit
And method.
Background technique
Power-management centre requires large-scale thermal power machine group that must have Automatic Generation Control (AGC) function, and to it
AGC performance indicator is examined accordingly.In actual production process, the AGC control logic of thermal power generation unit is that design is being sent out
In the scattered control system (DCS) of power plant, communicated by RTU device and power-management centre.Power-management centre is filled by RTU
It sets to thermal power generation unit and sends AGC instruction, and receive the actual power of thermal power generation unit return by RTU.Work as firepower
When the AGC function of generating set is not because being able to satisfy grid requirements when failure is forced to exit or put into, need on the DCS in power plant
It checks control logic, and adjusts and optimize AGC control program and controller parameter setting.Power plant is typically located at suburb, due to
Self-technique weak generally requires to wait the long period again by other once technical staff can't resolve the problem in factory
The technical staff of R&D institution, which rushes to the scene, carries out corresponding technology adjustment and guidance, neither can guarantee thermal power generation unit
AGC Control platform is also unfavorable for the timeliness and satisfaction of the service of developing skill.
Summary of the invention
In order to solve the disadvantage that the prior art, the first object of the present invention are to provide a kind of AGC function of thermal power generation unit
It can long-range optimization system.
A kind of long-range optimization system of AGC function of thermal power generation unit of the invention, comprising:
PID controller, for controlling thermoelectric generator according to unit load error amount and preset PID controller parameter
The actual negative charge values of group；The unit load error amount is the difference of AGC load setting value and unit actual negative charge values；
Data acquisition device, be used to acquire in real time thermal power generation unit actual negative charge values, AGC load setting value and
The output valve of PID controller, and it is sent to remote data center server；
The remote data center server is used to choose unit actual negative charge values in certain period of time, AGC load
The output valve of setting value and PID controller further establishes the first order modeling of thermal power generation unit；It is based on thermoelectric generator again
The first order modeling of group, adjusts preset PID controller parameter using Internal Model Control Algorithm；Finally by the PID after adjusting
Controller parameter feeds back to PID controller；
The PID controller is also used to control the reality of thermal power generation unit according to the PID controller parameter after adjusting
Load value, the final AGC function of realizing thermal power generation unit remotely optimize.
The long-range optimization system of AGC function of the thermal power generation unit of the invention, is sent out firepower using data acquisition device
The operation data of motor group accesses in a remote data center server, the operation based on the thermal power generation unit that transmission obtains
Data are carried out mathematical modeling to thermal power generation unit, and are carried out using Internal Model Control Algorithm to preset PID controller parameter
Adjusting, finally feeds back to the PID controller parameter after adjusting in PID controller, so that after PID controller is using adjusting
PID controller parameter controls generating set load, the final long-range optimization realized to thermal power generation unit AGC function,
Technical staff is greatly saved and runs the time at scene, while improving the timeliness and satisfaction of technological service.
Preferably, remote data center server is configured as: establishing one to thermal power generation unit using least square method
Rank model.Wherein, first-order mathematic model can be well reflected the response characteristic of most industrial process objects.Least square method
Quadratic sum by minimizing error finds the optimal function matching of data.It can easily be acquired using least square method unknown
Data, and between the data and real data that these are acquired error quadratic sum be minimum.An order based on foundation
Model is learned, PID controller parameter is optimized using Internal Model Control Algorithm,
Further, data acquisition device and thermal power generation unit correspond.Remote data center service of the invention
Device, convenient for the more further data minings of generating set in region, can carry out more with more generating sets in access area
Aircrew cooperation control technology etc. is more into the technical research of a level.
Further, remote data center server is also connected with prior-warning device, for the different of early warning thermal power generation unit
Normal operating status.
The second object of the present invention is to provide a kind of long-range optimization method of AGC function of thermal power generation unit.
A kind of long-range optimization method of AGC function of thermal power generation unit of the invention, specifically includes the following steps:
Step (1): PID controller controls firepower hair according to unit load error amount and preset PID controller parameter
The actual negative charge values of motor group；
Step (2): data acquisition device acquires unit actual load value, AGC load setting value and PID controller in real time
Output valve, and be sent to remote data center server；
Step (3): unit actual negative charge values, AGC load in remote data center server selection certain period of time are set
The output valve of definite value and PID controller further establishes the first order modeling of thermal power generation unit；Further according to thermal power generation unit
First order modeling and Internal Model Control Algorithm, preset PID controller parameter is adjusted；Finally the PID after adjusting is controlled
Device parameter feedback processed is to PID controller；
Step (4): PID controller controls the actual negative of thermal power generation unit according to the PID controller parameter after adjusting
Charge values, the final long-range optimal control for realizing thermal power generation unit AGC function.
The long-range optimization method of AGC function of the thermal power generation unit of the invention, by the operation data of thermal power generation unit
It accesses in a remote data center server, the operation data based on the thermal power generation unit that transmission obtains, to thermal power generation
Unit carries out mathematical modeling, and is adjusted using Internal Model Control Algorithm to preset PID controller parameter, after finally adjusting
PID controller parameter feed back in PID controller so that PID controller using adjusting after PID controller parameter to power generation
Unit load is controlled, the final long-range optimization and maintenance realized to thermal power generation unit AGC function, by a distant place calculate with
Adjustment, saves a large amount of human and material resources cost, the timeliness for the service that develops skill；By distant place data access, it can be achieved that machine
The on-line monitoring of group operation data, can find in time when abnormal, carry out early warning.
Preferably, in step (3), remote data center server by utilizing least square method establishes thermal power generation unit
First order modeling.Wherein, first-order mathematic model can be well reflected the response characteristic of most industrial process objects.Least square
Method finds the optimal function matching of data by minimizing the quadratic sum of error.It can easily be acquired not using least square method
The data known, and the quadratic sum of error is minimum between the data and real data that these are acquired.
Further, this method further include: unit load threshold value of warning is also preset in remote data center server, far
Received unit actual negative charge values compared with preset unit load threshold value of warning, and are exported early warning by journey data center server
Signal carrys out the abnormal operating condition of early warning thermal power generation unit to prior-warning device.
The output valve of PID controller in the present invention is to control the steam turbine pitch aperture of thermal power generation unit actual load
Command signal.
The invention has the benefit that
(1) the long-range optimization system of AGC function of the thermal power generation unit of the invention, using data acquisition device by firepower
The operation data of generating set accesses in a remote data center server, the fortune based on the thermal power generation unit that transmission obtains
Row data, to thermal power generation unit carry out mathematical modeling, and using Internal Model Control Algorithm to preset PID controller parameter into
Row adjusting, finally feeds back to the PID controller parameter after adjusting in PID controller, so that after PID controller is using adjusting
PID controller parameter controls generating set load, the final long-range adjustment realized to thermal power generation unit AGC function with
Maintenance is greatly saved technical staff and runs the time at scene, while improving the timeliness and satisfaction of technological service.
(2) remote data center server of the invention can be with more generating sets in access area, convenient for more in region
The further data mining of platform generating set carries out more aircrew cooperation control technologies etc. more into the technical research of a level.
(3) the long-range optimization method of AGC function of the thermal power generation unit of the invention, by the operation number of thermal power generation unit
According in one remote data center server of access, the operation data based on the thermal power generation unit that transmission obtains sends out firepower
Motor group carries out mathematical modeling, and is adjusted using Internal Model Control Algorithm to preset PID controller parameter, finally will adjusting
PID controller parameter afterwards is fed back in PID controller, so that PID controller is using the PID controller parameter after adjusting to hair
Electric unit load is controlled, and the final long-range optimization and maintenance realized to thermal power generation unit AGC function is calculated by a distant place
And adjustment, save a large amount of human and material resources cost, the timeliness for the service that develops skill；By distant place data access, it can be achieved that right
The on-line monitoring of data unit operation can be found in time when abnormal, carry out early warning.
Detailed description of the invention
Fig. 1 is the AGC control loop schematic diagram of thermal power generation unit；
Fig. 2 is the long-range optimization system structural schematic diagram of AGC function of thermal power generation unit of the invention；
Fig. 3 (a) is the AGC load setting value and unit actual negative charge values curve of certain time；
Fig. 3 (b) is the output valve curve of the PID controller of certain time；
Fig. 4 is the long-range optimization method flow chart of AGC function of thermal power generation unit of the invention.
Specific embodiment
The present invention will be further described with embodiment with reference to the accompanying drawing:
For thermal power generation unit AGC control program as shown in Figure 1, wherein PV value is unit actual load, SP value is AGC load
Instruction, OP value is the output of PID controller.The target of AGC control is to calculate the deviation of PV value and SP value, which is sent into
PID controller carries out operation, and the output valve (OP) of PID controller changes the steam turbine pitch aperture of thermal power generation unit, in turn
The actual load for changing thermal power generation unit comes so that unit actual negative charge values (PV) can track power-management centre passes through
RTU device is sent to the AGC load instruction (SP) in power plant.
The output valve of PID controller in the present invention is to control the steam turbine pitch aperture of thermal power generation unit actual load
Command signal.
Fig. 2 is a kind of long-range optimization system of AGC function of thermal power generation unit of the invention.Firepower hair as shown in Figure 2
The long-range optimization system of AGC function of motor group, comprising:
PID controller, for controlling thermoelectric generator according to unit load error amount and preset PID controller parameter
The actual negative charge values of group；The unit load error amount is the difference of AGC load setting value and unit actual negative charge values；
Data acquisition device is used to acquire unit actual load value, AGC load setting value and PID controller in real time
Output valve, and be sent to remote data center server；
The remote data center server is used to choose unit actual negative charge values in certain period of time, AGC load
The output valve of setting value and PID controller further establishes the first order modeling of thermal power generation unit；It is based on thermoelectric generator again
The first order modeling of group, adjusts preset PID controller parameter using Internal Model Control Algorithm；Finally by the PID after adjusting
Controller parameter feeds back to PID controller；
The PID controller is also used to control the reality of thermal power generation unit according to the PID controller parameter after adjusting
Load value, the final AGC function of realizing thermal power generation unit remotely optimize.
Wherein, unit actual negative charge values of the remote data center server based on seclected time period, AGC load setting value with
And the output valve of PID controller, thermal power generation unit is carried out with least square method to establish first order modeling.According to research and test
Show that first-order mathematic model can reflect the response characteristic of most industrial process objects well.The firepower of first order modeling is sent out
Motor group model is set as P (s), and P (s) can be write as:
Wherein, parameter K, T1, θ respectively represent transmission gain coefficient, first-order lag time constant and pure delay time constant.
The thermal power generation unit as representated by the data in Fig. 3 (a) and Fig. 3 (b), the first order modeling ginseng of thermal power generation unit
Several least square methods can be calculated:
That is: K=1.242, T1=12.27, θ=4.
PID controller parameter is adjusted according to Internal Model Control Algorithm according to the first order modeling that modeling obtains.
The formula of PID controller is:
Wherein, parameter Kp、Ti、TdRespectively represent the scale parameter, integral parameter and differential parameter of PID controller.
For first order modeling, the formula of Internal Model Control Algorithm Tuning PID Controller parameter is:
Wherein, the parameter uniquely adjusted is τc, indicate desired closed-loop time constant (i.e. 0.25 × closed loop steady state time),
This parameter can be arranged in user according to their needs.Once this parameter determines, three parameter K of PID controllerp, Ti, TdAlso with
Determination.Thermal power generation unit control object as shown in Figure 3, if it is determined that closed loop steady state time is 300 seconds, then corresponding to calculate
Obtained PID controller parameter are as follows:
Kp=0.125, Ti=12, Td=0
First order modeling and PID controller parameter is calculated, fire can be sent to by remote data center server
Power generator group, technical staff's reference for power plant execute.Guidance and adjusting and optimizing are carried out by remote mode, it can be effective
Solve the problems, such as site technology weak, technological service not in time.
The long-range optimization system of AGC function of thermal power generation unit as shown in Figure 2, data acquisition device and thermoelectric generator
Group corresponds.Remote data center server of the invention can be generated electricity in access area 1,2 ..., N (N is positive integer) platform
Unit carries out more aircrew cooperation control technologies etc. more into one convenient for the more further data minings of generating set in region
The technical research of level.Wherein, data acquisition device is the prior art.
Further, remote data center server is also connected with prior-warning device, for the different of early warning thermal power generation unit
Normal operating status.
The mode for obtaining unit load error amount can in many ways or structure obtains, under enumerate two kinds of specific embodiment parties
Formula:
It is a kind of that unit load error amount being calculated using subtracter:
Subtracter acquisition device transmission comes for receiving data AGC load setting value and unit actual negative charge values, and will
It is poor that the two is made, and is sent to PID controller after obtaining unit load error amount.
Another kind is that unit load error amount is calculated using microprocessor:
Microprocessor acquisition device transmission comes for receiving data AGC load setting value and unit actual negative charge values, and
By the two as difference obtain unit load error amount after be sent to PID controller.
Microprocessor can realize using single-chip microcontroller or PLC, can also be using other existing controller chips come real
It is existing.
The long-range optimization system of the AGC of the thermal power generation unit of the present embodiment, using data acquisition device by thermal power generation
The operation data of unit accesses in a remote data center server, the operation number based on the thermal power generation unit that transmission obtains
According to, to thermal power generation unit progress mathematical modeling, and it is whole to the progress of preset PID controller parameter using Internal Model Control Algorithm
It is fixed, finally the PID controller parameter after adjusting is fed back in PID controller, so that PID controller utilizes the PID after adjusting
Controller parameter controls generating set load, final to realize to the long-range optimization of thermal power generation unit AGC function and dimension
Shield is greatly saved technical staff and runs the time at scene, while improving the timeliness and satisfaction of technological service.
Fig. 4 is the long-range optimization method flow chart of AGC function of thermal power generation unit of the invention, firepower as shown in Figure 4
The long-range optimization method of AGC function of generating set, comprising:
Step (1): PID controller controls firepower hair according to unit load error amount and preset PID controller parameter
The actual negative charge values of motor group；
Step (2): data acquisition device acquires unit actual load value, AGC load setting value and PID controller in real time
Output valve, and be sent to remote data center server；
Step (3): unit actual negative charge values, AGC load in remote data center server selection certain period of time are set
The output valve of definite value and PID controller further establishes the first order modeling of thermal power generation unit；Further according to thermal power generation unit
First order modeling and Internal Model Control Algorithm, preset PID controller parameter is adjusted；Finally the PID after adjusting is controlled
Device parameter feedback processed is to PID controller；
Step (4): PID controller controls the actual negative of thermal power generation unit according to the PID controller parameter after adjusting
Charge values, the final AGC function of realizing thermal power generation unit remotely optimize.
Preferably, in step (2), remote data center server by utilizing least square method establishes thermal power generation unit
First order modeling.Wherein, first-order mathematic model can be well reflected the response characteristic of most industrial process objects.Least square
Method finds the optimal function matching of data by minimizing the quadratic sum of error.It can easily be acquired not using least square method
The data known, and the quadratic sum of error is minimum between the data and real data that these are acquired.
Further, this method further include: unit load threshold value of warning is also preset in remote data center server, far
Received unit actual negative charge values compared with preset unit load threshold value of warning, and are exported early warning by journey data center server
Signal carrys out the abnormal operating condition of early warning thermal power generation unit to prior-warning device.
The long-range optimization method of AGC function of the thermal power generation unit of the present embodiment, by the operation number of thermal power generation unit
According in one remote data center server of access, the operation data based on the thermal power generation unit that transmission obtains sends out firepower
Motor group carries out mathematical modeling, and is adjusted using Internal Model Control Algorithm to preset PID controller parameter, finally will adjusting
PID controller parameter afterwards is fed back in PID controller, so that PID controller is using the PID controller parameter after adjusting to hair
Electric unit load is controlled, and the final long-range optimization and maintenance realized to thermal power generation unit AGC function is calculated by a distant place
And adjustment, save a large amount of human and material resources cost, the timeliness for the service that develops skill；By distant place data access, it can be achieved that right
The on-line monitoring of data unit operation can be found in time when abnormal, carry out early warning.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of long-range optimization system of AGC function of thermal power generation unit characterized by comprising
PID controller, for controlling thermal power generation unit according to unit load error amount and preset PID controller parameter
Actual negative charge values；The unit load error amount is the difference of AGC load setting value and unit actual negative charge values；
Data acquisition device is used to acquire the defeated of unit actual load value, AGC load setting value and PID controller in real time
It is worth out, and is sent to remote data center server；
The remote data center server is used to choose unit actual negative charge values in certain period of time, AGC load setting
The output valve of value and PID controller, further establishes the first order modeling of thermal power generation unit；Again based on thermal power generation unit
First order modeling adjusts preset PID controller parameter using Internal Model Control Algorithm；Finally by the PID control after adjusting
Device parameter feedback is to PID controller；
The PID controller is also used to control the actual load of thermal power generation unit according to the PID controller parameter after adjusting
Value, the final automatic generation for realizing thermal power generation unit remotely control.
2. a kind of long-range optimization system of AGC function of thermal power generation unit as described in claim 1, which is characterized in that described
Remote data center server is configured as: establishing first order modeling to thermal power generation unit using least square method.
3. a kind of long-range optimization system of AGC function of thermal power generation unit as described in claim 1, which is characterized in that data
Acquisition device and thermal power generation unit correspond.
4. a kind of long-range optimization system of AGC function of thermal power generation unit as claimed in claim 3, which is characterized in that described
Remote data center server is also connected with prior-warning device, the abnormal operating condition for early warning thermal power generation unit.
5. a kind of long-range optimization system of AGC function of thermal power generation unit as described in claim 1, which is characterized in that firepower
The long-range optimization system of AGC function of generating set further includes subtracter, and acquisition device transmits the subtracter for receiving data
The AGC load setting value and unit actual negative charge values come, and the two work is poor, PID is sent to after obtaining unit load error amount
Controller.
6. a kind of long-range optimization system of AGC function of thermal power generation unit as described in claim 1, which is characterized in that firepower
The long-range optimization system of AGC function of generating set further includes microprocessor, microprocessor acquisition device for receiving data
Transmission come AGC load setting value and unit actual negative charge values, and by the two as difference obtain unit load error amount after be sent to
PID controller.
7. a kind of control method of the long-range optimization system of AGC function of the thermal power generation unit as described in claim 1-6 is any,
It is characterised by comprising:
Step (1): PID controller controls thermoelectric generator according to unit load error amount and preset PID controller parameter
The actual negative charge values of group；
Step (2): data acquisition device acquires the defeated of unit actual load value, AGC load setting value and PID controller in real time
It is worth out, and is sent to remote data center server；
Step (3): remote data center server chooses unit actual negative charge values, AGC load setting value in certain period of time
And the output valve of PID controller, further establish the first order modeling of thermal power generation unit；Further according to the one of thermal power generation unit
Rank model and Internal Model Control Algorithm adjust preset PID controller parameter；Finally by the PID controller after adjusting
Parameter feedback is to PID controller；
Step (4): PID controller controls the actual negative charge values of thermal power generation unit according to the PID controller parameter after adjusting,
The final automatic generation for realizing thermal power generation unit remotely controls.
8. the control method of the long-range optimization system of AGC function of thermal power generation unit as claimed in claim 7, feature exist
In in the step (2), remote data center server by utilizing least square method establishes First-Order Mode to thermal power generation unit
Type.
9. the control method of the long-range optimization system of AGC function of thermal power generation unit as claimed in claim 7, feature exist
In this method further include: the AGC load setting value acquired in real time is sent to micro- by data acquisition device with unit actual negative charge values
Processor；It is poor that microprocessor makees AGC load setting value and unit actual negative charge values, obtains unit load error amount and is sent to
PID controller.
10. the control method of the long-range optimization system of AGC function of thermal power generation unit as claimed in claim 7, feature exist
In this method further include: be also preset with unit load threshold value of warning, remote data center service in remote data center server
Device by received unit actual negative charge values compared with preset unit load threshold value of warning, and export pre-warning signal to early warning fill
It sets, carrys out the abnormal operating condition of early warning thermal power generation unit.
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| 基于内模控制的PID控制器的设计;刘红军等;《计算机仿真》;20040531;第22卷(第3期);摘要，正文第1-10页 |
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