CN204783136U - Large -scale coal -fired unit is alleviateed burden fast and is carried on one's shoulder or back control system - Google Patents
Large -scale coal -fired unit is alleviateed burden fast and is carried on one's shoulder or back control system Download PDFInfo
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- CN204783136U CN204783136U CN201520518474.5U CN201520518474U CN204783136U CN 204783136 U CN204783136 U CN 204783136U CN 201520518474 U CN201520518474 U CN 201520518474U CN 204783136 U CN204783136 U CN 204783136U
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Abstract
The utility model discloses a large -scale coal -fired unit is alleviateed burden fast and is carried on one's shoulder or back control system, including the electrical protection device that sends quick reduction of students' study load lotus FCB actuating signal, electric system, boiler control system, machine side control system and bypass control system are connected respectively to the electrical protection device, machine side control system passes through the electric liquid control system of steam turbine digit and is connected with the electrical protection device, electric system links to each other with steam turbine digit electro -hydraulic control system, machine side control system and bypass control system respectively. The direct or indirect control of system through the integration the all equipment of system, reduced the system control degree of difficulty to improve the control index, reduced the maloperation probability. Its logical design action is fast, and the equipment linkage is accurate, has ensured equipment system security nature.
Description
Technical field
This practical realization relating to fast cutback in thermal power plant (FCB) function, particularly a kind of Large-sized Coal-fired Power group fast cutback control system and controlling method.
Background technique
FCB controls to be the important loop controlling in " abroad " thermal power plant, is responsible for the fast load shedding of unit, realizes unit and again recovers load of electrical generation balance, substantial equilibrium, the task of energy balance.Under modern power plants is more and more pursued safety and realized the overall situation of factory's net integration, prevent mains breakdown, realize unit black starting-up aspect.The realization of FCB technology has important realistic meaning.
The realization of FCB function simultaneously contributes to unit safety and stops transport, and realize shutting down not blowing out function, effectively can reduce the number of times of boiler main fuel trip, these have very important realistic meaning for raising unit operation safety and economic performance.
Present Domestic there is no the FCB control program system put into operation, and FCB test of Waigaoqiao Power Plant is final also because deaerator level is too low, chemical moisturizing not as good as and can not long term maintenance " isolated power grid " operating mode.
Model utility content
The purpose of this utility model is to provide a kind of for the reliable fast cutback control system of Large-sized Coal-fired Power group and controlling method.What the system integrated was direct or indirect controls full plant, reduces Systematical control difficulty, and improves Con trolling index, reduce misoperation probability.
The purpose of this utility model is realized by following technical proposals.
A kind of Large-sized Coal-fired Power group fast cutback control system, comprise the electric protective device sending fast cutback FCB actuating signal, described electric protective device connects electrical system, boiler control system, pusher side control system and Bypass Control System respectively, and described pusher side control system is connected with electric protective device by digital electro-hydraulic control system; Described electrical system is connected with digital electro-hydraulic control system, pusher side control system and Bypass Control System respectively.
Further, described electrical system connects point main switch and FCB reseting logic unit respectively, is connected with digital electro-hydraulic control system by FCB reseting logic unit.
Further, described electrical system ECS is connected with Bypass Control System BPS with FCB reseting logic unit, pusher side control system TSCS respectively by the grid-connected signal that defines again of main transformer high pressure side breaker closing.
Further, described digital electro-hydraulic control system connects OPC logic element and rotary speed controling unit respectively.
Further, described pusher side control system connects each controlling mechanism of extract system, Condensate Pump Frequency Conversion control mechanism respectively, VV valve control device and low pressure (LP) cylinder attemperation control mechanism.
Further; described Bypass Control System connects high pressure turbine by control unit, the other control unit of low pressure and FCB reseting logic unit respectively, and described high Bypass control unit and FCB reseting logic unit are connected main vapour pressure control unit and the other protection of high pressure switch soon respectively.
Further, described boiler control system connects fuel control unit, to water control unit, attemperation control unit and wind and smoke control unit by subgroup logic interfacing.
Relative to prior art, the advantage of control strategy after the utility model optimization:
The utility model is used for the solution that the reliable fast cutback of Large-sized Coal-fired Power group controls; FCB actuating signal is outputed by the electic protection split screen of Millisecond; star-network connects, and according to the setting of action device requirement successively action system, completes the rapid load reductionperformance of unit.Add auxiliary bypass dilatation design, anti-Steam Turbine Over-speed Accident design simultaneously, prevent low row's temperature height design etc.The realization of fast cutback (FCB) function in this thermal power plant, fills up and the perfect blank of domestic unit in fast load shedding logic design, greatly improves unit automation level of control; Ensure that the unit operation safety of unit after unexpected off-grid; Relate under grid nodes accident, the fast cutback of Large-scale fire-electricity unit and the realization of restart facility.Its logic design requires action rapidity, and equipment linkage accuracy, the Security of support equipment system, integrates the rationality of full plant action.
The design ensures the isolated power grid of unit after off-grid; Effectively prevent the overspeed of steam turbine after band high load off-grid dangerous; Realize after off-grid shutting down not blowing out function; After off-grid, steam turbine and boiler realize energy and substantial equilibrium, do not cause boiler trip; Realize fast load shedding, effectively control main vapour pressure and Stream temperature degree, prevent the too fast injury caused for pipeline oxidization film of temperature decline.
Accompanying drawing explanation
Fig. 1 is the utility model system schematic.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, this Large-sized Coal-fired Power group fast cutback control system, comprise the electric protective device sending fast cutback FCB actuating signal, electric protective device connects electrical system ECS, boiler control system BSCS, pusher side control system TSCS and Bypass Control System BPS respectively, and pusher side control system TSCS is connected with electric protective device by digital electro-hydraulic control system DEH; Electrical system ECS is connected with digital electro-hydraulic control system DEH, pusher side control system TSCS and Bypass Control System BPS respectively.Electrical system ECS connects point main switch and FCB reseting logic unit respectively, is connected with digital electro-hydraulic control system DEH by FCB reseting logic unit.Electrical system ECS is connected with Bypass Control System BPS with FCB reseting logic unit, pusher side control system TSCS respectively by the grid-connected signal that defines again of main transformer high pressure side breaker closing.
Wherein, digital electro-hydraulic control system DEH connects OPC logic element and rotary speed controling unit respectively.Pusher side control system TSCS connects each controlling mechanism of extract system, Condensate Pump Frequency Conversion control mechanism respectively, VV valve control device and low pressure (LP) cylinder attemperation control mechanism.Bypass Control System BPS connects high pressure turbine by control unit, the other control unit of low pressure and FCB reseting logic unit respectively, and high Bypass control unit connects main vapour pressure control unit and the other protection of high pressure switch soon respectively.FCB reseting logic unit connects main vapour pressure control unit and the other protection of high pressure switch soon.Boiler control system BSCS connects fuel control unit, to water control unit, attemperation control unit and wind and smoke control unit by subgroup logic interfacing.
In this Large-sized Coal-fired Power group fast cutback control system, electric protective device, for sending fast cutback FCB actuating signal to electrical system, boiler control system, pusher side control system and Bypass Control System BPS.
Electrical system is defined (namely no longer using generator outlet breaker closing as grid-connected signal, being revised as main transformer high pressure side breaker closing is grid-connected signal) by grid-connected signal again, is connected with FCB action logic circuit.
Digital electro-hydraulic control system DEH is controlled by OPC logical action and rotation speed control mechanism.
Pusher side control system, exports each controlling mechanism of extract system, Condensate Pump Frequency Conversion control mechanism to, VV valve control device and low pressure (LP) cylinder attemperation control mechanism for control signal electrical system and digital electro-hydraulic control system DEH transmitted.
Bypass Control System BPS, for exporting fast cutback FCB actuating signal to hp and lp bypass control pressurer system and temperature controlling and regulating system.
Boiler control system, for transferring to boiler control system BSCS by fast cutback FCB actuating signal by boiler RB logic control system; Boiler control system connects fuel control unit, to water control unit, attemperation control unit and wind and smoke control unit by subgroup logic interfacing fast cutback RB.
Function subgroup logic interfacing of the present utility model comprises RB logic control system, Bypass Control System BPS, digital electro-hydraulic control system DEH, pusher side control system TSCS.
Based on FCB (unit fast cutback) system of 100% bypass, after FCB action, the rapid removal of load of generator is to station service; Digital electro-hydraulic control system DEH system is by OPC logical action.Comprise system acting logic and the order of design unit fast cutback FCB.Utilize the comprehensive trigger signal of off-grid electrically come, the grid-connected switch of action one by one, steam turbine septum valve, bypass pressure temperature control valve (TCV), water of condensation frequency variator, water adjustment doors on oxygen-eliminating device, stop coal-feeding conveyer, reduce the power plant system equipment such as feed pump capacity, realize the rapid load reductionperformance of full factory system, realize the isolated power grid of unit; Incorporate omnidistance Bypass Control, this design also comprises according to boiler, steam turbine performance characteristic simultaneously, and the targeted design signaling interface of its equipment linkage, makes the action between system and system rationally safer.
Native system devises grid.FCB action command connects with action equipment is starlike, postpones according to system requirements set action.
Electrohydraulic steam turbine controlling system (DEH) is transformed, increases acanning cycle and the frequency of DEH system measuring point fastener, guarantee the reliability of FCB actuating signal; Increase the action logic that FCB pusher side actuating signal triggers DEH system OPC, guarantee that turbine speed controls safety.
Increase the action logic of bypass when FCB operating mode, realize the whole-process control of bypass when FCB, ensure that fired power generating unit main vapour pressure is in slave mode all the time when FCB, ensure steam turbine and unit pipe safety.
Increase bypass at the action logic of FCB operating mode, realize the rapid load reductionperformance of boiler heat load when FCB, realize boiler at minimum steady combustion load.
The transformation of electrical equipment interlock logic, realizes station service and cuts soon, realize isolated power grid function, be reflected in rapidity and promptness requirement.
The overall framework of the FCB logic of native system design as shown in Figure 1.Electric protective device judges FCB trigger signal; produce FCB action command; by electrical system side, boiler control system side, this actuating signal of pusher side control system each function subgroup unified call (trigger signal homology), harmony when guaranteeing FCB action between system and reliability.Its function subgroup logic interfacing comprises RB (fast cutback), BPS (Bypass Control System), DEH (digital electro-hydraulic control system), TSCS (pusher side control system), BSCS (boiler control system), ECS (electric control system) dispatch control system.After FCB action, the rapid removal of load of generator is to station service; DEH system OPC action, fast by stabilization of speed at 3000r/min, thus ensure the station service frequency stabilization of " islet operation " operating mode; Boiler subtracts 50%Pe load soon in RB mode, ensures certain steady combustion load; Bypath system control main vapour pressure, then to slide to the pressure parameter under boiler heat load correspondence under given pace, sliding pressure speed and sliding pressure definite value will take into account the accumulation of heat requirement of boiler, prevent boiler turn hygrometric state run and temperature decline too fast.Other each relevant device, according to the action of operating mode interlocking, ensures that systematic parameter is stablized.
FCB operating criterion is very important, require the reliability of 100%, its actuating signal of this design be defined as zero power action (if main transformer high pressure side power once higher than 300MW and sudden change lower than 30MW) and generator outlet circuit breaker in co-bit, do not close with upper main inlet throttle-stop valve, three conditions and relation trigger FCB actuating signal again.Sub-main break road device switch after triggering FCB action, does not trigger generator tripping.
The process of generator connecting in parallel with system signal: definition any road of two-way main switch circuit breaker is in co-bit, and generator outlet circuit breaker is considered as grid-connected in co-bit, the grid-connected blackout of FCB operating mode.
Described logic design is ensure the rotating speed safety of steam turbine after off-grid, promote FCB actuating signal transmission frequency and frequency acquisition, signalizing activity <200ms retard time of design, the preferential OPC system closing steam turbine pitch by DEH, the control logic that the very first time switches DEH is that rotating speed controls, after ensureing that OPC recovers, utilize rotating speed to control to keep steam turbine 3000 to transport row, now unit has transferred isolated power grid in factory to.
Generator off-grid, needs to get rid of boiler heat load as early as possible, and keep boiler to fire load in minimum steady, the design utilizes the boiler RB logic increased when devising FCB.When FCB triggers, boiler 40% heat load RB logical triggering, to trip a coal pulverizer every 10s, retains bottom two coal pulverizers and runs steady combustion.
Design utilizes the energy balance between bypass maintenance boiler and steam turbine, namely Bypass Control main steam pressure is utilized, unnecessary steam is exported to vapour condenser by bypass, ensure to enter steam-turbine quality (prevent sudden temperature drop and prevent hypotony steam moisture from increasing), bypass needs to regulate main steam pressure within the specific limits simultaneously.Illustrate with supercritical unit, after FCB action, if finishing superheater outlet pressure is higher than 18MPa, high side is opened (5S pulse) soon, if finishing superheater outlet pressure is lower than 18MPa, boiler side keeps current loads, high other according to flow opening curve, the certain aperture of super relaxation action, then drops into automatically automatically.Drop into the height side automatically and be in FCB operating mode sliding pressure state, the speed with 0.36MPa/min is adjusted downward to desired value 18MPa by pressure set points, and the other sliding pressure state reset of height of FCB operating mode terminates, and operations staff can manual correction pressure definite value.High side pressure tunes up the high other temperature of valve opening interlock and adjusts valve, and automatically drops into automatically, and temperature definite value is slided with pressure after high side door.After FCB action, low side is dropped into automatically automatically, and low side pressure definite value slides to 1.3MPa with 0.5MPa/min speed, and low side pressure controls to drop into automatically, and the low other temperature that links controls also to drop into automatically, keeps Current Temperatures definite value.
In addition, VV valve is opened by OPC actuating signal connection; #1-#6 section is drawn gas by OPC actuating signal connection pass; FCBRB connection closes cooling water pitch 60s, recovers automatic control state after 60s; FCB action excision oxygen amount controls automatically; Excision secondary air box differential pressure controls; Excision boiler master; Excision turbine main control;
After adopting the system of the design, the control apparatus of full thermal power generation unit after perfect whole unit off-grid, achieve the rapid load reductionperformance of unit, after FCB action, furnace side control system gets rid of heat load fast; The DEH system very first time controls steam turbine rotating speed in acceptability limit; The very fast pressure release of bypath system then proceeds to voltage-controlled state; A large amount of automatic control ensure that unit proceeds to stably " isolated island " and runs, major parameter such as main vapour pressure, boiler heat load, confluent, Stream temperature degree, total blast volume are in slave mode all the time, through the success that two unit 50% loads and 100% load FCB are tested, the reliability of the design FCB control system of also giving counterevidence and controllability.
In sum; for level of factory unit; the realization of Large-scale fire-electricity unit FCB function contributes to the safety stoppage in transit of generator set; be easy to again realize compressor emergency shutdown not blowing out function; effectively can reduce the number of times of boiler main fuel trip; be conducive to that unit restarts under hot, load up; avoid the urgent blowing out of unit simultaneously, force quick cooling; prevent significantly declining fast of wall temperature; effectively can reduce the generation of boiler heating surface internal oxidition skin, these have very important realistic meaning for raising unit operation safety and economic performance.The realization of FCB function, unit possessed to proceed within the extremely short time ability only with station service " islet operation ", because boiler is still in larger capacity, as long as electric network fault recovers, can rapid grid-connected output >40%Pe load, the Hydropower Unit bearing black starting-up task relative to domestic routine has more larger recovery load carrying capacity, and this is for the raising important role of electric network security, indeed achieves the doulbe-sides' victory of factory's net.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model; can not assert that embodiment of the present utility model is only limitted to this; for the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; some simple deduction or replace can also be made, all should be considered as belonging to the utility model by submitted to claims determination scope of patent protection.
Claims (7)
1. a Large-sized Coal-fired Power group fast cutback control system, it is characterized in that: comprise the electric protective device sending fast cutback FCB actuating signal, described electric protective device connects electrical system, boiler control system, pusher side control system and Bypass Control System respectively, and described pusher side control system is connected with electric protective device by digital electro-hydraulic control system; Described electrical system is connected with digital electro-hydraulic control system, pusher side control system and Bypass Control System respectively.
2. Large-sized Coal-fired Power group fast cutback control system according to claim 1, is characterized in that: described electrical system connects point main switch and FCB reseting logic unit respectively, is connected with digital electro-hydraulic control system by FCB reseting logic unit.
3. Large-sized Coal-fired Power group fast cutback control system according to claim 2, is characterized in that: described electrical system is connected with Bypass Control System with FCB reseting logic unit, pusher side control system respectively by the grid-connected signal that defines again of main transformer high pressure side breaker closing.
4. Large-sized Coal-fired Power group fast cutback control system according to claim 1, is characterized in that: described digital electro-hydraulic control system connects OPC logic element and rotary speed controling unit respectively.
5. Large-sized Coal-fired Power group fast cutback control system according to claim 1, it is characterized in that: described pusher side control system connects each controlling mechanism of extract system, Condensate Pump Frequency Conversion control mechanism respectively, VV valve control device and low pressure (LP) cylinder attemperation control mechanism.
6. Large-sized Coal-fired Power group fast cutback control system according to claim 1; it is characterized in that: described Bypass Control System connects high pressure turbine by control unit, the other control unit of low pressure and FCB reseting logic unit respectively, described high Bypass control unit and FCB reseting logic unit are connected main vapour pressure control unit and the other protection of high pressure switch soon respectively.
7. Large-sized Coal-fired Power group fast cutback control system according to claim 1, is characterized in that: described boiler control system connects fuel control unit, to water control unit, attemperation control unit and wind and smoke control unit by subgroup logic interfacing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194290A (en) * | 2016-07-08 | 2016-12-07 | 国网河南省电力公司电力科学研究院 | A kind of fired power generating unit OPC policy optimization method being applicable to lonely net/microgrid |
| CN106707984A (en) * | 2016-11-23 | 2017-05-24 | 国网辽宁省电力有限公司电力科学研究院 | Method of using DCS to determine power transmission line fault and converting generator set into island model |
| CN113605998A (en) * | 2021-07-23 | 2021-11-05 | 中国能源建设集团华中电力试验研究院有限公司 | Method and system for processing operation fault of power generating unit of thermal power plant |
-
2015
- 2015-07-16 CN CN201520518474.5U patent/CN204783136U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194290A (en) * | 2016-07-08 | 2016-12-07 | 国网河南省电力公司电力科学研究院 | A kind of fired power generating unit OPC policy optimization method being applicable to lonely net/microgrid |
| CN106194290B (en) * | 2016-07-08 | 2018-07-10 | 国网河南省电力公司电力科学研究院 | A kind of fired power generating unit OPC policy optimization methods suitable for isolated network/microgrid |
| CN106707984A (en) * | 2016-11-23 | 2017-05-24 | 国网辽宁省电力有限公司电力科学研究院 | Method of using DCS to determine power transmission line fault and converting generator set into island model |
| CN106707984B (en) * | 2016-11-23 | 2019-03-29 | 国网辽宁省电力有限公司电力科学研究院 | DCS judges the method that transmission line malfunction makes generating set be transferred to island mode |
| CN113605998A (en) * | 2021-07-23 | 2021-11-05 | 中国能源建设集团华中电力试验研究院有限公司 | Method and system for processing operation fault of power generating unit of thermal power plant |
| CN113605998B (en) * | 2021-07-23 | 2023-08-22 | 中国能源建设集团华中电力试验研究院有限公司 | Thermal power plant generator set operation fault processing method and system |
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Effective date of registration: 20180730 Address after: 710065 No. 1 building, No. 12, Qin Tang, No. 187, science and technology four road, hi tech Zone, Xi'an, Shaanxi Patentee after: North China Electric Power Research Institute Co., Ltd. Xi'an branch Address before: 710065 No. 1 building, No. 12, Qin Tang, No. 187, science and technology four road, hi tech Zone, Xi'an, Shaanxi Patentee before: North China Electrical Power Research Institute (Xi'an) Co., Ltd. |
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