CN101629496B - Digital electrohydraulic control system of steam turbine with isolated network operation - Google Patents
Digital electrohydraulic control system of steam turbine with isolated network operation Download PDFInfo
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Abstract
The invention discloses a digital electrohydraulic control system of a steam turbine with isolated network operation, comprising a control hardware part and a software logical operation part, wherein the control hardware part includes a speed measuring protection part, a one-time frequency modulation module, a servo control module, a man-machine interface part, a control unit and an input/output module; and the software logical operation part includes a first frequency modulation operation and secondary frequency modulation operation unit based on frequency deviation, an overspeed limit unit based on an actual rotating speed measuring signal and a logical judgment unit based on an actual power measuring signal. The control system carries out logical processing and operation on the frequency deviation and outputs a control signal to control an electrohydraulic servo valve through the servo control module to drive a servomotor so as to drive a valve to move, thereby controlling the steam admission quantity of the steam turbine to keep the balance between the output of a steam turbine generator unit and the receiving load of the steam turbine generator unit; in addition, the speed measuring protection part takes an accelerated speed signal as a trigger condition of overspeed limit, thereby effectively limiting the rotating speed overshoot generated by the steam turbine generator unit because of load shedding.
Description
Technical field
The present invention relates to digital electro-hydraulic control system, relate in particular to the method and the device of Turbo-generator Set stable system frequency when unit or little network operation.
Background technique
Along with the development in pluralism of electric power system, big electrical network can not contained all power demands.Under following situation, unit or little network operation still can appear.
China's electrical network is ascendingly to grow up gradually, and under specific situation, big net also may off-the-line, little net operating mode occurs.In the area that big net fails to reach, still need adopt little net power supply.The private station of some factories for various reasons, needs to adopt lonely network operation.Export to the unit of undeveloped country, adapt to the requirement of lonely network operation possibly.For the unit of removal of load band station service, become decoupled mode after the removal of load, be equivalent to unit band light load.Present widely used digital electro-hydraulic control system---DEH introduced during a complete set of introduction 300MW of US Westinghouse company (Westinghouse ElectricCompany) steam turbine manufacturing technology at the initial stage eighties.From deh control system use condition for many years, particularly a large amount of uses of deh control system in minor scale power net have in recent years exposed some problems.DEH is controlled to be discrete control, and its stability, rapidity and continuous the adjusting have very big difference.In the DEH practice, find, the speed adjustment system of DEH, stability is far below the mechanical-hydraulic speed control system, and this is because discrete control system exists sampling distortion and operating delay, causes the stability of a system to descend.Most of traditional deh control system is kept the isolated little net frequency stabilization except that being difficult to, if big interconnecting ties road breaks down, also is difficult to keep stablizing of the isolated little net frequency that splits off.Therefore in order to improve isolated little net frequency of supply stability, must improve the continuous control ability and the capability of fast response of deh control system.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of digital electro-hydraulic regulating system for steam turbine, can make Turbo-generator Set system response time quickening when unit or little network operation, and control frequency is stable; Under the situation of removal of load band station service, can effectively limit the rotating speed overshoot that unit produces because of removal of load.The technical solution adopted for the present invention to solve the technical problems is a kind of digital electro-hydraulic regulating system for steam turbine of design; comprise control hardware part and software logic arithmetic section, described Control Hardware Department divides and comprises the guard block that tests the speed, primary frequency modulation module, servocontrol module, man-machine interface part, control unit, input/output module.Described software logic arithmetic section comprises primary frequency modulation computing and frequency modulation frequency modulation arithmetic element based on frequency departure, a hypervelocity limiting unit based on the actual speed measurement signal, a logic judgment unit based on the actual power measurement signal.Control system is carried out logical process and computing to frequency departure, the output control signal, drive oil engine by servocontrol module controls electrohydraulic control, drive valve motion, and then control steam turbine throttle flow is to keep Turbo-generator Set and exert oneself and institute is received to load and balances each other.The guard block that tests the speed simultaneously sends signal with acceleration signal as the trigger condition of hypervelocity restriction moves overspeed protection OPC solenoid valve immediately; close modulating valve rapidly; in addition; the guard block that tests the speed is also exported acceleration differential feed-forward signal and is given the servocontrol module; so that the servo-control system quick acting limits the rotating speed overshoot that unit produces because of removal of load effectively.
Because the present invention has adopted above technological scheme, the effect that is obtained is continuous control ability and the capability of fast response that has improved the DEH system greatly, can effectively limit unit because of the rotating speed overshoot that removal of load produces, guarantee the stability of isolated little net system frequency of supply.
Description of drawings
The typical digital electro-hydraulic control system structured flowchart of accompanying drawing 1 prior art.
Accompanying drawing 2 digital electro-hydraulic control system structured flowcharts of the present invention.
The configuration structure schematic representation of accompanying drawing 3 embodiment of the invention control hardwares part.
The logic diagram of accompanying drawing 4 embodiment of the invention deh control systems hypervelocity restriction.
The logic diagram of accompanying drawing 5 embodiment of the invention acceleration differential feedforward.
The logic diagram of accompanying drawing 6 embodiment of the invention software frequency modulation algorithms.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is the typical digital electro-hydraulic control system structured flowchart of prior art, among the figure: empty frame 11 is electronic control hardware components, empty frame 12 is hydraulic servo-actuator parts, and electronic control hardware components 11 comprises man-machine interface part 111, control unit 112, input/output module 113, overspeed protection parts 114 and servocontrol module 115; Hydraulic servo-actuator part 12 comprises electrohydraulic control 121, oil engine 122 and OPC device 123.
Fig. 2 digital electro-hydraulic control system structured flowchart of the present invention is made up of electronic control hardware components 21 and hydraulic servo-actuator part 22.
Described computer control part 21 is as shown in Figure 3: comprise a man-machine interface part 211, pair of control unit 212, input/output module 213, overspeed protection parts 214, servocontrol module 215 and primary frequency modulation module 216; Hydraulic servo-actuator part 22 comprises electrohydraulic control 221, oil engine 222 and OPC device 223.Control unit carries out logical process and computing to frequency departure, the output control signal, drive oil engine by servocontrol module controls electrohydraulic control, drive valve motion, and then control steam turbine throttle flow is to keep Turbo-generator Set and exert oneself and institute is received to load and balances each other.The guard block that tests the speed simultaneously sends signal with acceleration signal as the trigger condition of hypervelocity restriction moves overspeed protection OPC solenoid valve immediately; close modulating valve rapidly; in addition; the guard block that tests the speed is also exported acceleration differential feed-forward signal and is given the servocontrol module; so that the servo-control system quick acting limits the rotating speed overshoot that unit produces because of removal of load effectively.
Man-machine interface part 211 is an operator station, by a P4 industrial control PC, joins two ethernet modules, operator's keyboard special, a color printer, 22 " compositions such as LCD display.Also can join an engineer station as required, the complete biconditional operation person of engineer station's hardware configuration station, its software is also identical with operator station.
Interconnect by Redundant Ethernet between operator station and the DPU212.The Redundant Ethernet communication speed is 10Mbps.
I/O part 213 is made up of some basic I/O channel modules.According to the system layout requirement, two analog amount load modules (AI module), an analog output module (AO module), two switching input modules (DI module), a switching value output module (DO module), a thermocouple load module (TC module) are arranged.The AI module is finished isolation, processing and the analog-to-digital conversion to analog signals.The AO module is finished the output of digital-to-analog conversion and analog signals.The DI module is finished isolation, processing and the collection of switch amount signal.The output of DO module controls switching value.The TC module is finished the processing of thermocouple signal and conversion.Can as required the I/O modular member be expanded.
Primary frequency modulation module 216 is by gathering the acceleration magnitude analog signals of three speed measuring module outputs, after relatively, height choosing value is carried out differential, through again dynamic compensation signal being outputed to the dc voltage input end of servocontrol module after amplifying, realize the acceleration differential quick loop of feedovering.
The control hardware of embodiment of the invention digital electrohydraulic control system of steam turbine with isolated network operation and the control hardware of traditional deh control system are relatively, OPC and acceleration differential output function when acceleration is excessive have been increased, and kept oil switch tripping operation OPC function, and deleted hypervelocity 103% and load unbalanced OPC function.This function comprises following processing:
1) the actual speed measurement signal is differentiated, the acceleration signal of output and corresponding preset value such as 225r/min/s compare; Simultaneously actual power percentage signal and corresponding predefined value are compared as 30% rated power; When acceleration signal and actual power percentage signal during all more than or equal to corresponding predefined value, output is hypervelocity restriction control signal effectively;
2) when the oil switch trip signal effectively and actual power percentage signal during greater than corresponding predefined value, output is hypervelocity restriction control signal effectively;
3) in output effectively after the hypervelocity restriction control signal, when actual power percentage signal less than corresponding predefined value after a period of time, perhaps, when acceleration signal is invalid less than 0r/min/s and oil switch trip signal, export invalid hypervelocity and limits control signal;
4) degree of will speed up signal conversion becomes corresponding analog signals, outputs to the servocontrol module after amplifying compensation.
In order to realize said method, the control hardware device of present embodiment deh control system comprises logic judgment part and do-part, wherein the logic judgment part comprises three (also can be one or other number) logic judgment units, each logic judgment unit as shown in Figure 4, comprise first derivative unit, first comparator, second comparator, the 3rd comparator, the first time-delay reset timer, first rest-set flip-flop, first and door, second with door and first or.As shown in Figure 5, comprise the 4th comparator, second derivative unit and first amplifier.Wherein the 3rd comparator and the first time-delay reset timer can carry out computing in the main control unit of DEH, and all the other calculation function modules are in special-purpose speed measuring module of DEH and primary frequency modulation module.The actual speed measurement signal is sent into first derivative unit and is differentiated, and the acceleration signal of output compares with predefined value such as 225r/min/s in first comparator, and compares with predefined value 0r/min/s in second comparator simultaneously.When acceleration during more than or equal to 225r/min/s, first comparator is output as " 1 ", makes the first rest-set flip-flop set.When acceleration during less than 0r/min/s, second comparator is output as " 1 ", makes the first rest-set flip-flop reset.
Actual power percentage signal (comparing with unit rated power) compares as 30% at the 3rd comparator and predefined value.The output of the 3rd comparator is as the input of the first time-delay reset timer.When actual power more than or equal to 30% the time, the 3rd comparator is output as " 1 ", and makes the first time-delay reset timer set.When actual power less than 30% the time, the 3rd comparator is output as " 0 ", the first time-delay reset timer is reset to " 0 " in time-delay as after 2 seconds.
In actual power more than or equal to 30%, the first time-delay reset timer is output as under the condition of " 1 ", if acceleration more than or equal to 225r/min/s, makes first rest-set flip-flop be output as " 1 ", then first be output as " 1 " with door, will make first or door be output as " 1 ".
More than or equal to 30%, the first time-delay reset timer is output as under the condition of " 1 " in actual power,, then second is output as " 1 " with door if speed measuring module receives the oil switch trip signal, also will make first or door be output as " 1 ".
The actual speed measurement signal is sent into first derivative unit and is differentiated, the acceleration signal of output converts corresponding analog signals to by D/A, compare at the 4th comparator, maximum value is relatively carried out dynamic compensation by second derivative unit and first amplifier amplify output differential feed-forward signal to the servocontrol module.
Do-part comprises that OPC leaves relay and OPC solenoid valve, electrohydraulic control and oil engine, and the hypervelocity restriction control signal of each speed measuring module is controlled an OPC and left relay.When first or door when being output as " 1 ", the OPC of speed measuring module leaves the relay tip closure.If there is the OPC of two (promptly most of) to leave the relay tip closure in three speed measuring modules of DEH, then the OPC solenoid valve is charged, will all admission modulating valve of steam turbine cut out rapidly, thereby arrives the purpose of restriction rotating speed overshoot.The servocontrol module is control command, differential feed-forward signal and oil engine stroke LVDT signal relatively, and the output servo-control signal is given electrohydraulic control, finally controls oil engine to the relevant position.
After modulating valve cut out, the acceleration of unit and actual power can reduce.When acceleration during less than 0r/min/s, first rest-set flip-flop is exported go back to " 0 ".Export go back to " 0 " in actual power less than 30%, the first time-delay reset timer.When " 0 " is all gone back in the output of first rest-set flip-flop and the first time-delay reset timer, OPC solenoid valve dead electricity, modulating valve is transferred to servo-system control.
The present invention is equally applicable to the regulating system of other limitation function that need exceed the speed limit, and in addition, other mapping mode can also be arranged on the basis of the foregoing description:
Also can be set to other numerical value as required as above-mentioned each predefined value.Predefined value as acceleration signal can be taken as 220 ~ 230r/min/s, and actual power percentage signal corresponding preset value can be taken as 25 ~ 35%.And for example, logical circuit of the present invention is not limited to the form among Fig. 4, and any exceed the speed limit logical circuit of method for limiting of the present invention of can realizing can adopt.And for example, actual power percentage signal and corresponding predefined value also can replace with actual power signal and corresponding predefined value.And for example, above-mentioned processing to the oil switch trip signal is optionally, be reflected to can cancel on the device second among Fig. 4 and door and first or and respective input signals.These conversion scheme all should belong to protection scope of the present invention.
The control software logic of embodiment of the invention digital electrohydraulic control system of steam turbine with isolated network operation and the control software logic of traditional deh control system have relatively increased primary frequency modulation and frequency modulation frequency modulation algorithm function.
This function comprises following processing:
1) the actual speed measurement signal is carried out add operation with the setting rotating speed and obtain the frequency departure signal, the frequency departure signal is carried out obtaining the primary frequency modulation value after linear transformation and the ratio amplification.
2) to the actual speed measurement signal with set rotating speed and carry out add operation and obtain the frequency departure signal, with the frequency departure signal carry out integration to the frequency modulation frequency modulation value.
3) primary frequency modulation value, frequency modulation frequency modulation value and DEH main valve bit instruction are carried out add operation, final delivery valve bit instruction is given the servocontrol module.
In order to realize said method, the control software logic judging unit of present embodiment deh control system comprises first adder, second amplifier, first integrator, second adder, the 3rd adder as shown in Figure 6.
Set rotating speed (as 3000r/min) and actual speed after the first adder computing, through linear conversion, delivering to second amplifier handles, obtain the primary frequency modulation value, set rotating speed (as 3000r/min) and actual speed simultaneously after the first adder computing, delivering to first integrator handles, make the frequency modulation frequency modulation value through the integration saturation limit, primary frequency modulation value and frequency modulation frequency modulation value obtain the instruction of frequency modulation valve position after second adder is handled, the instruction of frequency modulation valve position and DEH main valve bit instruction are delivered to the 3rd adder and handled back output control and keep system frequency and stablize needed valve seat opening.
Claims (5)
1. the digital electro-hydraulic control system of a lonely network operation comprises control hardware part and software logic arithmetic section, it is characterized in that:
Described Control Hardware Department divides and comprises the guard block that tests the speed, primary frequency modulation module, servocontrol module, man-machine interface part, control unit, load module and output module; Described software logic arithmetic section comprises primary frequency modulation computing and frequency modulation frequency modulation arithmetic element based on frequency departure, a hypervelocity limiting unit based on the actual speed measurement signal, a logic judgment unit based on the actual power measurement signal; The state signal of steam turbine and parameter are sent into load module, servocontrol module and speed measuring module by various signals and are carried out the processing of plate level, send into control unit then and carry out computing, processing, data after will handling are at last delivered to man-machine interface and are partly shown, simultaneously can control unit be issued in instruction by operating man-machine interface section, the output signal after control unit will be handled is by output module, servocontrol module and the action of overspeed protection component controls actuator; Control system is carried out logical process and computing to frequency departure; the output control signal; drive oil engine by servocontrol module controls electrohydraulic control; drive valve motion; and then control steam turbine throttle flow is to keep Turbo-generator Set and exert oneself and institute is received to load and balances each other; judge the trigger condition that limits as hypervelocity with the acceleration signal of hypervelocity limiting unit and the logic of actual power measurement signal simultaneously; can effectively limit the rotating speed overshoot that unit produces because of removal of load; the guard block that tests the speed is also exported acceleration differential feed-forward signal; after the primary frequency modulation resume module; give the servocontrol module; so that servo-control system quick acting; and then it is stable to make Turbo-generator Set keep system frequency under unit or little network operation situation, guarantees power supply quality.
2. the digital electro-hydraulic control system of a kind of lonely network operation as claimed in claim 1 is characterized in that:
The guard block that tests the speed in the described control hardware part is made of three speed measuring modules and the protective circuit that tests the speed; Described man-machine interface partly is an operator station; Described control unit is redundant active and standby computer; Described load module and output module comprise: analog amount load module and analog output module, switching input module and switching value output module, thermal resistor load module, thermocouple load module; Described operator station links to each other by the redundant data expressway with control unit; Load module links to each other with control unit by bus with output module, speed measuring module and servocontrol module.
3. the digital electro-hydraulic control system of a kind of lonely network operation as claimed in claim 2 is characterized in that:
Described speed measuring module is differentiated to the actual speed measurement signal, and the acceleration differential signal of output after the primary frequency modulation resume module, is delivered to the servocontrol module with the differential feed-forward signal, constitutes the quick loop of analog hardware.
4. the digital electro-hydraulic control system of a kind of lonely network operation as claimed in claim 1 is characterized in that:
Described software logic arithmetic section primary frequency modulation computing and frequency modulation frequency modulation arithmetic element comprise a comparator, amplifier, integrator; Described hypervelocity limiting unit based on the actual speed measurement signal, the actual speed measurement signal is differentiated, the acceleration signal and the corresponding preset value of output compare, the logic judgment unit of power measurement signal compares actual power percentage signal and corresponding predefined value, when acceleration signal and actual power percentage signal during all more than or equal to corresponding predefined value, output is hypervelocity restriction control signal effectively.
5. the digital electro-hydraulic control system of a kind of lonely network operation as claimed in claim 1 is characterized in that:
The described guard block that tests the speed when carrying out the hypervelocity limitation function, makes hypervelocity restriction solenoid valve charged, and the admission modulating valve of steam turbine cuts out rapidly; When the invalid hypervelocity of output limits control signal, make OPC solenoid valve dead electricity, modulating valve is transferred to servo-system control.
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