CN109960143A - The control method for coordinating of fired power generating unit - Google Patents
The control method for coordinating of fired power generating unit Download PDFInfo
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- CN109960143A CN109960143A CN201711424273.9A CN201711424273A CN109960143A CN 109960143 A CN109960143 A CN 109960143A CN 201711424273 A CN201711424273 A CN 201711424273A CN 109960143 A CN109960143 A CN 109960143A
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- fuel
- power generating
- generating unit
- control signal
- fired power
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
Abstract
The invention discloses a kind of control method for coordinating of fired power generating unit, fired power generating unit includes fuel machine, and control method for coordinating is the following steps are included: be converted into unit inertia of energy time generation inertia time characterisitic function according to fuel in fired power generating unit；The control signal that feedforward controller exports is modified by inertia time characterisitic function, obtains fuel output quantity control signal；Fuel output quantity control signal is exported to the fuel machine, to control the fuel output quantity of the fuel machine.The present invention is modified the control signal that feedforward controller exports by inertia time characterisitic function, revised fuel output quantity control signal is exported to fuel machine, to realize the fuel output quantity of control fuel machine quick according to load instruction, stable, shorten the reaction time that unit is adjusted, optimize the timeliness of control system, avoid because load rate variation is fast, overshoot discharge amplitude is larger, caused by combustion chamber draft, coal pulverizer, the unstable phenomenon to water management.
Description
Technical field
The present invention relates to automation control area, in particular to a kind of control method for coordinating of fired power generating unit.
Background technique
Currently, in the debugging process of thermoelectricity fire coal Turbo-generator Set CCS (coordinated control system of monoblock), it is general
All over the effect for emphasizing PID (proportional, integral-Derivating controller) adjuster, dynamic Feedforward is also only according to load instruction using letter
The fixed coefficient of single differentiation element or tape speed is realized to the control to fuel machine (generally feeder), does not consider that fuel turns
Change the unit inertia of energy time (3min-7min) into, and the inertia time is that machine unit characteristic can not change.The prior art
In, if load rate changes, due to the presence of inertia time, the time for supplementing fuel can be postponed, at this time when load changing rate becomes
Fastly, overshoot discharge amplitude is larger, just will increase combustion chamber draft, coal pulverizer, the unstability to water management in unit, gives thermal motor
Group brings risk.
Summary of the invention
When the technical problem to be solved by the present invention is in order to overcome fired power generating unit load rate variation in the prior art, due to
The inertia time of fuel can postpone the time for supplementing fuel, and at this time when load changing rate becomes faster, overshoot discharge amplitude is larger, will
Combustion chamber draft, coal pulverizer, the unstability to water management in increase unit, the defect of risk is brought to fired power generating unit, is provided
A kind of control method for coordinating of fired power generating unit.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of control method for coordinating of fired power generating unit, the fired power generating unit include fuel machine, it is characterized in that, the coordination
Control method the following steps are included:
S1, be converted into according to fuel in fired power generating unit the unit inertia of energy time and generate inertia time characterisitic function；
S2, by inertia time characterisitic function the control signal that feedforward controller exports is modified, it is defeated to obtain fuel
Output controls signal；
S3, output fuel output quantity control signal to the fuel machine, to control the fuel output quantity of the fuel machine.
Preferably, in step S1In, further includes:
The first correction function is generated according to the increasing load pressure deviation of fired power generating unit or load shedding pressure divergence；
Step S2Later, further includes:
S21, according to first correction function to fuel output quantity control signal once corrected, after once correcting
Fuel output quantity control signal as desired fuel output quantity control signal；
Step S3Pass through step S3' replace；
S3', output desired fuel output quantity control signal to the fuel machine, to control the fuel output of the fuel machine
Amount.
Preferably, in step S1In, further includes:
The second correction function is generated according to the load setting of fired power generating unit；
In step S21In, to fuel output quantity control signal once corrected the step of after, further includes:
Second-order correction is carried out to primary revised fuel output quantity control signal according to second correction function, by two
Secondary revised fuel output quantity control signal controls signal as desired fuel output quantity.
Preferably, the inertia time characterisitic function is nonlinear function.
Preferably, the control method for coordinating further include:
The Changing load-acceleration in fired power generating unit is obtained, the feedforward controller generates control letter according to the Changing load-acceleration
Number.
Preferably, the fired power generating unit further includes water pump；
The control method for coordinating further include:
The control signal is exported to the water pump, to control the confluent of the water pump.
Preferably, the fuel machine includes hot air disperser module；
The control method for coordinating further include:
The control signal is exported to the hot air disperser module, to control the air quantity of the fuel machine.
The positive effect of the present invention is that: what the present invention exported feedforward controller by inertia time characterisitic function
Control signal is modified, and revised fuel output quantity control signal is exported to fuel machine, to realize according to load instruction
Quickly, the fuel output quantity of stable control fuel machine, shortens the reaction time that unit is adjusted, optimizes the timeliness of control system
Property, avoid because load rate variation is fast, overshoot discharge amplitude is larger, caused by combustion chamber draft, coal pulverizer, the shakiness to water management
Fixed phenomenon.
Detailed description of the invention
Fig. 1 is the flow chart of the control method for coordinating of the fired power generating unit of the embodiment of the present invention 1.
The inertia time characterisitic function that Fig. 2 is generated in the control method for coordinating for the fired power generating unit of the embodiment of the present invention 1 is bent
Line chart.
The control signal curve figure that Fig. 3 is generated in the control method for coordinating for the fired power generating unit of the embodiment of the present invention 1.
The fuel output quantity that Fig. 4 is generated in the control method for coordinating for the fired power generating unit of the embodiment of the present invention 1 controls signal
Curve graph.
Fig. 5 is the Logical Configuration schematic diagram of the control method for coordinating of the fired power generating unit of the embodiment of the present invention 1.
Fig. 6 is the flow chart of the control method for coordinating of the fired power generating unit of the embodiment of the present invention 2.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
Embodiment 1
As shown in Figure 1, the control method for coordinating of the fired power generating unit of the present embodiment realize the fuel output quantity to fuel machine,
The coordinated control of the confluent to air quantity and water pump of hot air disperser module in fuel machine, specifically, the control method for coordinating packet
Include following steps:
Step 110 is converted into unit inertia of energy time generation inertia time characteristic letter according to fuel in fired power generating unit
Number.
Wherein, inertia time characterisitic function be nonlinear function, inertia time characterisitic function curve G (t) as shown in Fig. 2,
Wherein, τ is start delay, and process is debugged parameter, obtained according to engineering experience, and the range of general τ is 20s-90s；T2 is AGC
The load instruction end time that (Automatic Generation Control) system is sent.
Step 120 is modified the control signal that feedforward controller exports by inertia time characterisitic function, is fired
Expect that output quantity controls signal.
It wherein, further include generating control signal before the step of feedforward controller output control signal, specific step:
Feedforward controller obtains the load instruction that AGC system is sent, and load instruction includes the varying duty speed in fired power generating unit
Rate, feedforward controller generate control signal by differentiation element, realization, which is worked as, to be connect then according to Changing load-acceleration, and over time
When receiving lifting load instruction, unit presses the pre-set rate lifting load of operations staff, until load reaches target load.
Wherein, signal curve H is controlled1(t) as shown in figure 3, h is the maximum feedforward amount for controlling signal, h=Vt×Kd×Td；VtIt is negative to become
Lotus rate, artificially inputs parameter；KdFor the differential gain；TdFor derivative time；T1 is the starting response time, with τ and TdPhase is set
It closes, t1=f (τ, Td)；T2 is the load instruction end time that AGC system is sent；T3 is the control loop end time, with TdPhase
It closes, t3-t2=f (Td)。
Control signal is modified by inertia time characterisitic function, it is also i.e. that the inertia time characterisitic function of Fig. 2 is bent
The control signal curve of line and Fig. 3 carry out synthesis operation, and the block curve namely fuel output quantity formed in Fig. 4 controls signal
Curve H (t).
Step 130, output fuel output quantity control signal are to fuel machine, to control the fuel output quantity of fuel machine.This reality
It applies in example, fuel machine is feeder, fuel output quantity namely coal-supplying amount.
The present embodiment is modified the control signal that feedforward controller exports by inertia time characterisitic function, will correct
Fuel output quantity control signal afterwards is exported to fuel machine, to realize control fuel machine quick according to load instruction, stable
Fuel output quantity shortens the reaction time of unit adjusting, optimizes the timeliness of control system.To make unit in difference
Changing load-acceleration, different load stages, increase load stage or load shedding stage, when main vapour pressure generates relatively large deviation, all
Energy automatic adjustment adaptation unit operating condition variation, and then ensured and can safe under AGV control, quickly, accurately, steadily respond,
Meet the requirement of power grid control load.
In the present embodiment, control method for coordinating further include:
Control signal is exported to water pump, to control the confluent of water pump.Certainly, according to actual needs, can also will control
Signal exports after being modified to water pump.
Control signal is exported to hot air disperser module, to control the air quantity of the fuel machine.Certainly, according to actual needs,
It exports after control signal can also being modified to hot air disperser module.
In the present embodiment, load instruction further includes load rate setting, load condition and pressure divergence situation.It is adjusting
In the process, as shown in figure 5, feedforward controller is also suitable according to load rate setting, load condition and the adjustment of pressure divergence situation
When differential gain Kd, derivative time Td, load setting increases load pressure deviation, load shedding pressure divergence and start-up study τ,
Finally to realize the rapidly and efficiently response of Fuel Control System, adjust automatically adapts to the variation of unit operating condition, to realize efficiently steady
Fixed control.Specifically, the Logical Configuration schematic diagram of the algorithm referring to the present embodiment of Fig. 5, KdPass through function F1(x) it indicates, Td
Pass through function F2(x) it indicates, load setting passes through F3(x) it indicates, increases load pressure deviation and pass through F4(x) it indicates, load shedding pressure
Deviation passes through F5(x) it indicates, start-up study passes through F6(x) it indicates.In Fig. 5, T indicates that switch, dotted line lead to walk Y, it is obstructed walk N.
Embodiment 2
Embodiment 2 is substantially the same manner as Example 1, as shown in fig. 6, the difference is that, in the step 110 of the present embodiment,
Further include:
The first correction function is generated according to the increasing load pressure deviation of fired power generating unit or load shedding pressure divergence.
After step 120, further includes:
Step 121 once corrects fuel output quantity control signal according to the first correction function, after once correcting
Fuel output quantity control signal as desired fuel output quantity control signal.
Step 130 passes through step 130 ' it replaces；
Step 130 ', output desired fuel output quantity control signal to fuel machine, to control the fuel output quantity of fuel machine.
In the present embodiment, in step 110, further includes:
The second correction function is generated according to the load setting of fired power generating unit.
In step 121, to fuel output quantity control signal once corrected the step of after, further includes:
Second-order correction is carried out to primary revised fuel output quantity control signal according to the second correction function, at this time by two
Secondary revised fuel output quantity control signal controls signal as desired fuel output quantity.
In the present embodiment, the desired fuel output quantity control signal after second-order correction can more certainly
Dynamic adjusting adapts to unit operating condition and changes, and ensures that unit is safe under AGV control, quickly, accurately, steadily responds, meets power grid
Control the requirement of load.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (7)
1. a kind of control method for coordinating of fired power generating unit, the fired power generating unit include fuel machine, which is characterized in that the coordination control
Method processed the following steps are included:
S1, be converted into according to fuel in fired power generating unit the unit inertia of energy time and generate inertia time characterisitic function；
S2, by inertia time characterisitic function the control signal that feedforward controller exports is modified, obtain fuel output quantity control
Signal processed；
S3, output fuel output quantity control signal to the fuel machine, to control the fuel output quantity of the fuel machine.
2. the control method for coordinating of fired power generating unit as described in claim 1, which is characterized in that in step S1In, further includes:
The first correction function is generated according to the increasing load pressure deviation of fired power generating unit or load shedding pressure divergence；
Step S2Later, further includes:
S21, according to first correction function to fuel output quantity control signal once corrected, will once revised combustion
Output quantity control signal, which is expected, as desired fuel output quantity controls signal；
Step S3Pass through step S3' replace；
S3', output desired fuel output quantity control signal to the fuel machine, to control the fuel output quantity of the fuel machine.
3. the control method for coordinating of fired power generating unit as claimed in claim 2, which is characterized in that in step S1In, further includes:
The second correction function is generated according to the load setting of fired power generating unit；
In step S21In, to fuel output quantity control signal once corrected the step of after, further includes:
Second-order correction is carried out to primary revised fuel output quantity control signal according to second correction function, is repaired secondary
Fuel output quantity control signal after just controls signal as desired fuel output quantity.
4. the control method for coordinating of fired power generating unit as described in claim 1, which is characterized in that the inertia time characterisitic function
For nonlinear function.
5. the control method for coordinating of fired power generating unit as described in claim 1, which is characterized in that the control method for coordinating also wraps
It includes:
The Changing load-acceleration in fired power generating unit is obtained, the feedforward controller generates control signal according to the Changing load-acceleration.
6. the control method for coordinating of fired power generating unit as claimed in claim 5, which is characterized in that the fired power generating unit further includes water
Pump；
The control method for coordinating further include:
The control signal is exported to the water pump, to control the confluent of the water pump.
7. the control method for coordinating of fired power generating unit as claimed in claim 5, which is characterized in that the fuel machine includes hot air disperser
Module；
The control method for coordinating further include:
The control signal is exported to the hot air disperser module, to control the air quantity of the fuel machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711424273.9A CN109960143A (en) | 2017-12-25 | 2017-12-25 | The control method for coordinating of fired power generating unit |
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| CN201711424273.9A CN109960143A (en) | 2017-12-25 | 2017-12-25 | The control method for coordinating of fired power generating unit |
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Family
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111142377A (en) * | 2019-12-23 | 2020-05-12 | 山东电力工程咨询院有限公司 | Fuel quantity feedforward control method of coordinated control system considering operation state of coal mill |
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Address after: 200031 No. 68, Gaoyou Road, Shanghai, Xuhui District Applicant after: Shanghai electric power construction start adjustment test Institute Co., Ltd Address before: 200031 No. 68, Gaoyou Road, Shanghai, Xuhui District Applicant before: SHANGHAI ELECTRIC POWER CONSTRUCTION STARTING AND ADJUSTMENT TESTING LABORATORY |
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Application publication date: 20190702 |