CN108279713A - Organic working medium geothermal power generation coordinated control system based on microprocessor and method - Google Patents
Organic working medium geothermal power generation coordinated control system based on microprocessor and method Download PDFInfo
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- CN108279713A CN108279713A CN201810210941.6A CN201810210941A CN108279713A CN 108279713 A CN108279713 A CN 108279713A CN 201810210941 A CN201810210941 A CN 201810210941A CN 108279713 A CN108279713 A CN 108279713A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D13/00—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
- G05D13/62—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover characterised by the use of electric means, e.g. use of a tachometric dynamo, use of a transducer converting an electric value into a displacement
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Abstract
The present invention discloses organic working medium geothermal power generation coordinated control system and method based on microprocessor, including PLC controller, control flow, executing agency, measuring device and power supply；The output end of the input terminal connection measuring device of PLC controller, output end drive organic working medium steam turbine through servo module connection actuating mechanism controls end, executing agency's output end；Measuring device is for measuring the rotary speed actual value of organic working medium steam turbine, the vibration signal of front stall and back seat and the running state parameter for including temperature, pressure and flow；Control flow interacts display control parameter and state of a control with PLC controller；Power supply is used to be PLC controller, control flow and measuring device power supply；PLC controller is used to carry out PID control to the rotating speed of organic working medium steam turbine according to rotary speed actual value and speed setting value；And logical operation is carried out according to vibration signal and running state parameter and generates parameter monitoring and alarm signal.Realize spatial load forecasting.
Description
Technical field
Cryogenically hot generation technology field, specially the organic working medium geothermal power generation based on microprocessor the present invention relates in
Coordinated control system and method.
Background technology
Low-temperature geothermal resource is abundant in China, and the technical research of low temperature underground heat power generating thermodynamic cycle, can push in development
In cryogenically hot generation technology solve regional electricity needs in the popularization and application of China suitable area and increase energy resource supply
Source.
Critical component of the organic working medium steam turbine as in low temperature underground heat power generating thermodynamic cycle needs it to be unfolded deeply
Research.Basic control system of the governing system as Turbo-generator Set, dynamic characteristic not only can be to the economy of unit
Had an impact with safety, can also to power supply quality, mainly to power and frequency generate shadow we, to the stability to power grid
Problem has an impact.
Turbine regulating system experienced the development of three phases, and what is be widely used at present is digital electro-hydraulic control system.
Common turbine regulating system can preferably meet the normal operation of fired power generating unit, and it is inadequate even to there is automatic control function
Perfect problem, and the development of the control governing system suitable for middle low temperature geothermal generator group is more in simulation study rank
Section.The different characteristics in base area thermal output source and organic working medium electricity generation system, research critical component steam turbine and ground thermal output system
The coordination control strategy of system and complete control system, there is no the reports of this respect at present.
Invention content
For problems of the prior art, the present invention provides the organic working medium geothermal power generation based on microprocessor and coordinates
Control system and method, control are simple and efficient, and precision is high, can carry out speed, pressure and the synchronous adjustment of load, ensure underground heat
The safety and stability of low-temperature generation device.
The present invention is to be achieved through the following technical solutions：
Organic working medium geothermal power generation coordinated control system based on microprocessor, including PLC controller, control flow execute
Mechanism, measuring device and power supply；
The output end of the input terminal connection measuring device of the PLC controller, output end are connected through servo module and are executed
Mechanism controls end, executing agency's output end drive organic working medium steam turbine；
The measuring device is used to measure the vibration letter of the rotary speed actual value of organic working medium steam turbine, front stall and back seat
Number and include the running state parameter of temperature, pressure and flow；
The control flow interacts display control parameter and state of a control with PLC controller；
The power supply is used to be PLC controller, control flow and measuring device power supply；
The PLC controller be used for according to rotary speed actual value and speed setting value to the rotating speed of organic working medium steam turbine into
Row PID control；And logical operation is carried out according to vibration signal and running state parameter and generates parameter monitoring and alarm signal.
Preferably, PLC controller uses S7-200CPU224XP type PLC, has been provided with 14 digital quantity input measuring points, 10
A digital output measuring point, 2 analog output measuring points and 1 analog output measuring point.
Preferably, measuring device includes three passive electrical magnetic-type speed probes, corresponding close to organic working medium steamer respectively
The gear installation of machine shaft connection corresponds to organic working medium steam turbine turn by detecting tooth on gear by the mobile output of its magnetic pole
The frequency output signal of speed.
Further, the three road rate-adaptive pacemaker electric signals that measuring device output end exports are carried out amplitude conversion by PLC controller,
So that it is become corresponding rotary speed actual value, be compared with speed setting value, when at least there are two do not meet to set in three signals
When definite value, the rotary speed actual value of organic working medium steam turbine is obtained, is sent out to the valve position limiter of PLC controller output end connection defeated
Go out signal.
Preferably, it is connected by PC/PPI Programme Lines between PLC controller and host computer, upper computer end taste USB connects
Mouthful, PLC controller port is serial line interface, is communicated using RS232 or RS485 transport protocols.
Further, control flow is connected with host computer by serial cable；PLC controller and control flow are connected by serial line interface
It connects, uses RS485 transport protocols.
Preferably, the input terminal of PLC controller further includes six speed setting value input ports, and six speed setting values are defeated
Inbound port is sequentially connected remote setting value according to setting value priority, synchronization settings value, overspeed test setting value, turns from high to low
Speed setting lifting values, rotating speed set decreasing value and start setting value.
Organic working medium geothermal power generation control method for coordinating based on microprocessor, includes the following steps,
From steam turbine acquire three tachometer values, through in excessive three signals at least there are two do not meet setting value when, rotating speed
It needs to adjust, sends out output signal to valve actuating mechanism is reconciled, obtain the rotary speed actual value for organic working medium steam turbine control；
In the different phase of steam turbine operation, control system exports different speed setting values；Speed setting value presses logic
Priority be arranged in order respectively remote setting value, synchronization settings value, overspeed test setting value, speed setting value lifting/lowering with
And start setting value；
The speed setting value of different phase is arranged by Logic Priority sequence, when setting for priority higher next stage
When definite value is selected, the lower setting value on last stage of priority is replaced automatically.
Preferably, it after set grid-connection, needs to control the load of unit, simultaneously by load deviation and rotating speed deviation
Input PID controller；Rotating speed is controlled under unit load Controlling model service condition, and PID has different setting values；By pre-
If control logic, when service condition switches, the instruction of cutting-in control parameter selection is sent out, each ginseng in PID controller is made
Number is changed, and meets the requirement of different phase；The load signal that access power grid is provided makes as the setting value of spatial load forecasting
It converts load deviation to corresponding rotating speed deviation with speed governing diversity factor.
Preferably, when carrying out initial steam pressure control, by the instruction of initial steam pressure setting value lifting/lowering by determining step-length into
Steam pressure setting value is adjusted, or provides pressure set points by long-range mode, and remote setting value has excellent in logic
Elder generation's property；By cascade PID by initial steam pressure input value, three signals of initial steam pressure setting value and diversity factor logic value of feedback it is inclined
Difference controls initial steam pressure as input, output pressure control signal, and pressure controling signal is controlled according to initial steam pressure and thrown
Enter or exit progress percentage and be converted to speed setting value, by controlling initial steam pressure the amendment of speed setting value.
Compared with prior art, the present invention has technique effect beneficial below：
The present invention carries out speed regulating control using the PLC controller as microprocessor as core, to organic working medium steam turbine, fits
For middle low temperature geothermal steam turbine, pass through PLC controller, control flow and the cooperation of executing agency, it is ensured that cryogenic heat exchanger, organic
The coordinated operation of working medium steam turbine, organic working medium pump and condenser, ensures the safety and stability of underground heat low-temperature generation device.
Start or manually boot mode automatically by selection, the setting value and control of valve position of rotating speed are controlled by governing system or operating personnel
Device exports, and completes the startup of organic working medium steam turbine, and rotating speed will be controlled in the minimum speed of setting.Rotating speed PID controller exists
It is operated in unit load control model after grid-connected, the setting of spatial load forecasting is used as by receiving the load signal that power grid provides
Value converts load deviation to using speed governing diversity factor the rotating speed deviation of response, realizes spatial load forecasting.Its rotating speed control accuracy reaches
To ± 1 rev/min, speed governing diversity factor is continuously adjusted within the scope of 3-6%.
Further, it is instructed by initial steam pressure setting value lifting/lowering, it, can be to steam turbine into vapour pressure according to setting step-length
Power is adjusted.
Further, maximum (top) speed setting value is made to rise to 115% rated speed by setting the tachometer value of governing system,
Execute unit overspeed test, test steam turbine motor and mechanical overspeed protection function.
Description of the drawings
Fig. 1 is the structural schematic diagram of governing system described in present example；
Fig. 2 is the speed control principle schematic diagram of governing system described in present example.
Fig. 3 is the principle schematic that initial steam pressure adjusts logic described in present example.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
This system uses the Time-delayed Feedback algorithm in PID self-setting functions, is carried out to controller parameter and control system excellent
Change design.Its process is that a small but lasting disturbance, the week disturbed in process variable are generated in the state that one stable
Phase and amplitude will determine frequency and the gain of control process.Then final gain and frequency values, PID Self-tuning System programs is utilized to carry
For suitable yield value, integral time value and differential time value.The present invention is based on the organic working medium geothermal power generation of microprocessor associations
Control system is adjusted, as shown in Figure 1 comprising PLC controller, control flow, executing agency, measuring device and power supply.
Wherein PLC controller using S7-200CPU224XP the type PLC, the PLC of Siemens there are 14 digital quantities to input
Measuring point, 10 digital output measuring points, 2 analog output measuring points and 1 analog output measuring point, and adjusted with PID
Function；To meet the control requirement of organic working medium steam turbine, need to connect five 4 Analog input mModules and 2 analog quantitys
Output module.
Used control flow is the configurable touching display screens of SMART 700IE of Siemens Company, by the control
The work(such as parameter state monitoring, control parameter adjustment, control model conversion and parameter-beyond-limit alarm may be implemented in the picture configuration of screen
Energy.
Use executing agency for Japan Glory Company Nucom-NM40 type electronic actuators.
In said program, measuring device includes：
Tachometric survey part is arranged close to and organic working medium vapour using three passive electrical magnetic-type speed probes (MPU)
At the gear of turbine shaft connection, the mobile offer that its magnetic pole is passed through by detecting tooth on gear corresponds to the frequency of turbine speed
Rate output signal.
It is filtered by revolution counter, tach signal is converted into 4-20mA standard electric signals, and PLC controller S7-200 is given in output.
PLC controller carries out amplitude to these three tach signals and is converted into perunit value, is compared with speed setting value, when
At least the rotary speed actual value controlled for rotating speed is obtained there are two when not meeting setting value, executed to mediation valve in three signals
Mechanism sends out output signal.
Vibration measurement part measures the Vibration Condition of organic working medium steam turbine front stall and back seat using viberation monitor.
Turbine state measurement part, including temperature measure, the devices such as pressure measurement and flow measurement.
Organic working medium steam turbine involved by this programme is level Four, according to its structure, is supervised using 15 simulation measuring points
Survey the entrance and running state parameter at different levels (temperature, pressure, flow) of organic working medium steam turbine.
This 15 analog signals input PLC controller S7-200 by analog quantity spread module, carry out logic wherein
Operation generates parameter monitoring and alarm signal.
In said program, the communication of governing system is related to PLC controller, HMI control flows and PC host computers three
Equipment, including：
Communication between PLC and PC uses dedicated PC/PPI Programme Lines, the ends PC to be made an excuse for USB, and the ends PLC are serial interface
Mouthful, it is communicated using RS232 or RS485 transport protocols；
The connection of HMI and PC directly uses serial cable；
Communication between PLC and HMI also uses serial line interface, transport protocol RS485.
In said program, in control loop exit design valve position limiter.
In said program, used power supply is 220VAC (exchange) power supply, and is converted electrical energy by the effect of transformer
For different voltage class, used for each equipment in system；It designs stand-by power supply and uses storage battery power supply, in 220V AC
Work is cut when power failure or power-off.
This governing system specific work process is described below：
As shown in Fig. 2, acquiring three tachometer values from steam turbine, 2 are selected (when at least there are two be not inconsistent in three signals by 3
Close setting value when, that is, think that rotating speed needs to adjust, to reconcile valve actuating mechanism send out output signal) and filter after, obtain and be used for
The rotary speed actual value of organic working medium steam turbine control.
In the different phase of steam turbine operation, control system exports different speed setting values.Speed setting value in Fig. 2
It is arranged in order by Logic Priority sequence, respectively remote setting value, synchronization settings value, overspeed test setting value, speed setting value
Lifting/lowering and startup setting value.
The speed setting value of different phase is arranged by Logic Priority sequence, when setting for priority higher next stage
When definite value is selected, the lower setting value on last stage of priority is replaced automatically.
Startup setting value is minimum speed setting value, when " operation (START) " instruction is sent out, makes organic working medium steam turbine
Start from zero rotary regimes, reaches the minimum speed value of target.
Speed setting value lifting/lowering is to promote speed setting value under automatic Starting or manual operation, makes rotating speed not
It is disconnected to rise, until rotating speed reaches rated value.In automatic start, it is inclined with actual value that regulating system constantly detects speed setting value
Difference to adjust raising speed rate, and is switched to PID when slip is less than 8rpm and accurately controls.
Under conditions of overspeed test setting value carries out overspeed test for Steam Turbine, set speed setting value to
110% rated speed value, and at the same time the upper limit of speed setting value is promoted to 115% rated speed, to ensure to exceed the speed limit temporarily
Experiment is not limited by the speed setting value upper limit.Overspeed test is finished, immediately will be on speed setting value and speed setting value
Limit is adjusted to rated value.
Synchronization settings value is selected under conditions of organic working medium Steam Turbine is grid-connected.In generator breaker GSE and master
Under conditions of circuit breaker LSE is closed, unit carries out and net operation, and control system selects synchronization settings value, makes generating unit speed
It is consistent with power grid rotating speed.After the completion of simultaneously network process, the rotating speed of unit is only by power grid control.
Remote setting value is not located in control logic, and makes to be given to control system by telecommunication.When input is remote
When journey speed setting value, it can be with speed setting value not necessarily.Under this condition, regulating system makes speed setting value by certain
Raising speed rate synchronized with long-range speed setting value.
Wherein GSE is generator breaker closure signal, and LSE is main circuit breaker closure signal, when unit carries out together
When step, GSE/LSE=1.
Using PID controller as the controller of governing system, output is the inclined of speed setting value and rotary speed actual value
Difference.
It after set grid-connection, needs to control the load of unit, load deviation and rotating speed deviation is inputted into PID simultaneously
Controller.Rotating speed is controlled under unit load Controlling model service condition, and PID has different setting values.Pass through default control
Logic sends out " cutting-in control parameter selection " instruction, each parameter in PID is made to be changed when service condition switches,
Meet the requirement of different phase.
In order to ensure the consistency of deviation, the load signal that access power grid is provided makes as the setting value of spatial load forecasting
It converts load deviation to corresponding rotating speed deviation with speed governing diversity factor.
Meet the requirement that system is adjusted in real time by the feedback control of controller output valve.
This system also there is organic working medium steam turbine to have pressure controlled function into vapour, be carried out to initial steam pressure regulating loop
It after configuration, is controlled signal precentagewise and is converted into speed setting value, reached into vapour by the amendment to speed setting value
The purpose of pressure control.
From the figure 3, it may be seen that can be instructed by determining step-length to initial steam pressure setting value by initial steam pressure setting value lifting/lowering
It is adjusted, pressure set points can also be provided by long-range mode.Remote setting value has priority in logic, when this
When signal inputs, preferentially selected by initial steam pressure setting value module.Ensure tandem using tandem pressure control diversity factor feedback
The stability of pid loop, the feedback signal are the percentage of cascade PID output.Be added tandem diversity factor after, cause tandem into
Steam pressure input signal and setting value it is inconsistent, the deviation of three signals is played control action by cascade PID as input.
Specifically, cascade PID is by initial steam pressure input value, the deviation of initial steam pressure setting value and diversity factor logic three signals of value of feedback
As input, output pressure control signal controls initial steam pressure, and pressure controling signal is controlled according to initial steam pressure and put into
Or exit progress percentage and be converted to speed setting value, by controlling initial steam pressure the amendment of speed setting value.
Finally, controller output meets control of the value of valve position bound for carrying out actuator.
Claims (10)
1. the organic working medium geothermal power generation coordinated control system based on microprocessor, which is characterized in that including PLC controller, control
System screen, executing agency, measuring device and power supply；
The output end of the input terminal connection measuring device of the PLC controller, output end connect executing agency through servo module
Control terminal, executing agency's output end drive organic working medium steam turbine；
The measuring device be used to measure the rotary speed actual value of organic working medium steam turbine, front stall and back seat vibration signal, with
And include the running state parameter of temperature, pressure and flow；
The control flow interacts display control parameter and state of a control with PLC controller；
The power supply is used to be PLC controller, control flow and measuring device power supply；
The PLC controller is used to carry out the rotating speed of organic working medium steam turbine according to rotary speed actual value and speed setting value
PID control；And logical operation is carried out according to vibration signal and running state parameter and generates parameter monitoring and alarm signal.
2. the organic working medium geothermal power generation coordinated control system according to claim 1 based on microprocessor, feature exist
In PLC controller uses S7-200CPU224XP type PLC, has been provided with 14 digital quantity input measuring points, 10 digital outputs
Measuring point, 2 analog output measuring points and 1 analog output measuring point.
3. the organic working medium geothermal power generation coordinated control system according to claim 1 based on microprocessor, feature exist
In measuring device includes three passive electrical magnetic-type speed probes, and corresponding close organic working medium rotating shaft of steam turbine connects respectively
Gear is installed, and the mobile output that its magnetic pole is passed through by detecting tooth on gear corresponds to the rate-adaptive pacemaker of organic working medium turbine speed
Signal.
4. the organic working medium geothermal power generation coordinated control system according to claim 3 based on microprocessor, feature exist
In the three road rate-adaptive pacemaker electric signals that measuring device output end exports are carried out amplitude conversion by PLC controller, it is made to become corresponding
Rotary speed actual value, be compared with speed setting value, when in three signals at least there are two do not meet setting value when, had
The rotary speed actual value of machine working medium steam turbine sends out output signal to the valve position limiter of PLC controller output end connection.
5. the organic working medium geothermal power generation coordinated control system according to claim 1 based on microprocessor, feature exist
In being connected by PC/PPI Programme Lines between PLC controller and host computer, upper computer end taste USB interface, PLC controller
Port is serial line interface, is communicated using RS232 or RS485 transport protocols.
6. the organic working medium geothermal power generation coordinated control system according to claim 5 based on microprocessor, feature exist
In control flow is connected with host computer by serial cable；PLC controller is connected with control flow by serial line interface, and RS485 is used
Transport protocol.
7. the organic working medium geothermal power generation coordinated control system according to claim 1 based on microprocessor, feature exist
Further include six speed setting value input ports in the input terminal of, PLC controller, six speed setting value input ports are according to setting
Definite value priority is sequentially connected remote setting value, synchronization settings value, overspeed test setting value, rotating speed setting promotion from high to low
Value, rotating speed set decreasing value and start setting value.
8. the organic working medium geothermal power generation control method for coordinating based on microprocessor, which is characterized in that include the following steps,
Three tachometer values are acquired from steam turbine, through, at least there are two when not meeting setting value, rotating speed needs in excessive three signals
It adjusts, sends out output signal to valve actuating mechanism is reconciled, obtain the rotary speed actual value for organic working medium steam turbine control；
In the different phase of steam turbine operation, control system exports different speed setting values；Speed setting value presses Logic Priority
Sequence is arranged in order respectively remote setting value, synchronization settings value, overspeed test setting value, speed setting value lifting/lowering and opens
Dynamic setting value；
The speed setting value of different phase is arranged by Logic Priority sequence, when the setting value of priority higher next stage
When being selected, the lower setting value on last stage of priority is replaced automatically.
9. the organic working medium geothermal power generation control method for coordinating according to claim 8 based on microprocessor, feature exist
In after set grid-connection, needing to control the load of unit, load deviation and rotating speed deviation inputted PID control simultaneously
Device；Rotating speed is controlled under unit load Controlling model service condition, and PID has different setting values；By default control logic,
When service condition switches, the instruction of cutting-in control parameter selection is sent out, each parameter in PID controller is made to be changed,
Meet the requirement of different phase；The load signal that access power grid is provided uses speed governing etc. as the setting value of spatial load forecasting
Rate converts load deviation to corresponding rotating speed deviation.
10. the organic working medium geothermal power generation control method for coordinating according to claim 8 based on microprocessor, feature exist
In when carrying out initial steam pressure control, by the instruction of initial steam pressure setting value lifting/lowering by determining step-length to initial steam pressure setting value
It is adjusted, or pressure set points is provided by long-range mode, remote setting value has priority in logic；Pass through tandem
PID is defeated using the deviation of initial steam pressure input value, initial steam pressure setting value and diversity factor logic three signals of value of feedback as input
Go out pressure controling signal to control initial steam pressure, pressure controling signal controls input according to initial steam pressure or exits carry out hundred
Ratio is divided to be converted to speed setting value, by controlling initial steam pressure the amendment of speed setting value.
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| CN201810210941.6A CN108279713A (en) | 2018-03-14 | 2018-03-14 | Organic working medium geothermal power generation coordinated control system based on microprocessor and method |
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| CN111706406A (en) * | 2020-06-15 | 2020-09-25 | 华能罗源发电有限责任公司 | Quick medium speed warm-up control system |
| CN114252645A (en) * | 2020-09-23 | 2022-03-29 | 和舰芯片制造(苏州)股份有限公司 | Rotation speed detection system and method thereof |
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