基于PLC的控制系统在供电系统中的应用毕业论文外文翻译

1、外文资料application of control system on the base of plc in power-supply systemthe paper introduces a distributed control system of sewage treatment, and the core of the system is plc. the structure of the control system, the assignment and implementation of the tasks, the control scheme and the design

2、concept of program are expounded. the way of central monitoring management and dispersing control is used by the control system; the long一distance control and monitoring of field equipment are uncharged of the upper computer; the software program of designs uses intouch7. 0. the specific technology,

3、 equipment, the controlling of main parameter and several running data are uncharged of the plc stations, and the software program of designs uses concept 2.2xl with online tracking and outline simulating. mb+ net is adopted by the communication between the upper computer and the plc stations, with

4、its simply build ingnet, quickly running and stable communication. the automatic control of plc has been successfully completed in sewage treatment, which has improved the operation efficiency and management level of sewage treatment equipmentintroduced to take plc as the distribute type control sys

5、tem of core in the wastewater treatment system of apply.concretely described the structure, mission of the control system an allotment and carry out, the way of control and the thought of the program design. the way controled the concentration monitor of the system adoption a management and scattere

6、d a control, the place of honor machine be responsible for the spot the long range of the equipments control and surveillance, software adoption intouch7. 0 draw up.the plc native station is responsible for to the concrete craft, equipments and is mainly controled parameter to carry on control and c

7、ollect various movement data, the program design adoption have on-line follow with off-line imitate the concept of true function 2. 2 xl software.place of honor machine and of the plc adoption set the net be quickly simple and circulate speed, correspond by letter the stability strong mb+net.the who

8、le control system successfully solved the plc controls a problem in the automation within wastewater treatment and raised a wastewater treatment equipments to circulate an efficiency and manage level.recently, for carrying out high quality, low consume, stable dependable movement.domestic and intern

9、ational many wastewater treatment factorieses adopted a modern forerunner to control technique and calculator technique and constitute calculator direct, control thus, manage system.make system excellent to turn movement.but the programmable logic controller(plc) then take microprocessor as core.syn

10、thesize the calculator technique automatically controls technique and correspondence technique but develops of a kind of new and in general use utomatic control device.have structure simple, function superior, dependable sex gao, work properly words in general use, be easy to plait distance, usage c

11、onvenience etc. advantage etc.the silver chuan city the first wastewater treatment factory adopted a sbr craft and take plc as the control system of core, day after handling the sewage 10 104 t the processing of reach mark sewage can used for an agriculture irrigation.1control system structurecontro

12、l the way of concentration monitor management, scatter a control of the system adoption.the emulation hold, place of honor machine, gather a line machine, printer to be located on medium control room, two set plcs are located on control the spot.adopt this kind of structure can make the information

13、in the production line can centralized management with carry out whole operation, management with excellent turn.also make to control dangerous dispersion in the meantime, raise the system credibility.11the upper computersmedium control two calculator adoption pii class works of room to control mach

14、ine, circulate the operate system of windows nt.the place of honor machine be responsible for on the scene establish each long range control(full-automatic control, automatic control, order to move a control) with surveillance, make use of intouch7. 0 engineering software packages provide a good per

15、son machine dialogue boundary but obtain concerning parameter and equipments appearance information from the plc by searching a way, keep a view manifestation to come out on the crt by good sketch type, print a necessary data in the meantime and be provided for lord to control and manager instructio

16、n produce.supervise and control boundary but include the system total diagram, system cent diagram, imitate the quantity general chart, parameter a constitution, report to the police a window, history trend and register a window etc. boundary but.in the system total diagram, circulate the personnel

17、can keep watch on signals, such as all movement appearances, equipments trouble and liquid which control an equipments and discharge.etc.operate a personnel in the system the cent the diagram can carry on a single machine point to move to circulate an operation to all control equipmentses, become th

18、e set automatically circulate operation or the whole factorieses full-automatic operation combine surveillance.in the meantime place of honor machine 2 and do a plait distance a machine.medium control room to establish another an inset type emulation to hold, is been one control by the place of hono

19、r machine, in order to keep the craft process of the view manifestation whole factory and main parameter value.12the plc standaccording to wastewater treatment of two part, the spot the long range of the equipments the control output and the spot the signal collect to control a station completion fr

20、om two plc wood ground.plc1 native control station control the space grid, sewage promote a pump house, pu spirit to sink sand ponds etc. to prepare a processing part.the plc2 native control station controls dirty mire to dehydrate, press to filter machine etc. department.plc3 native control station

21、 control sbr living creature processing part.moreover, the on the spot native control station is each to establish an operation terminal to establish each, be responsible for at native to establish each control on the scene.（automatic control, order to move a control）the spot is each the physical pa

22、rameter that the supervision order and include water level, temperature, discharge and turn soon, electric currents etc. imitate quantity, from to in response to of an appearance spread a feeling machine or change to send to a machine examination to come out and change into the electric current sign

23、al of the 420 ma, through shield inside the plc that the electric cable sends to each statures system, from the plc picks up a people through various mold piece sample telecommunication number.same, imitate quantity control the signal send to performance organization by the 420 ma electric current f

24、orm after being output by the plc, control performance organization of action.the modicon quantum series plc of schneider company is satisfy liberal of, according to standard of network conjunction and the spot total line conjunction etc. application the technique provided various network a choice,

25、support modbus, mod-bus plus(mb+), the long range i/0, tcp/ip etc. network conjunction, have stronger and vivid.therefore, the wastewater treatment is convenient to arrive of the plc choose the series of modicon ouantum of use schneider.13correspondencesmb+agreement is the modicon company release of

26、 an open type of the adoption ieee802. 4 correspond by letter 5 agreements the spot total line of card agreement.mb+the network together other networks compare to have a set of net simple, the investment be little, network speed quick, correspondence the stability strong etc. characteristics, it mak

27、e calculator, controller and other data sources through an usage double wring line or fiber optic cable be a body to together carry on correspondence at the whole network top.but the cpu mold piece of the modicon quantum series plc imply mb+correspondence, therefore correspond by letter a network to

28、 choose to use mb+network.medium control two machine, two control stations with native plc of room to pass mb+the network link together.the plc cpu mold piece passes mb+correspondence and two machines carry on data commutation and collect the place of honor supervision various operation instruction

29、of the system and the spot the examination signal and data, through analysis handle, pass exportation mold piece to control object output control signal;in the meantime, the plc passes mb+net upward the machine return to various data, place of honor machine logarithms according to carry on an operat

30、ion processing, show various signal and print various statement.2the design of plc control programthe system has four kinds of control methods:the native hand moves a control, single set equipments point moves a control, become a set, the equipments automatically controls, the whole factory equipmen

31、ts full-automatic control.two kinds of ex- with general methods at establish each adjust to try or maintain usage, the system is mainly circulate with full-automatic control.under this kind of way, all each kind of equipmentses from plc according to in advance draw up of procedure auto control, dont

32、 need to operate a personnel an intervention.various spot data spreads a highest machine through a plc, come out in the place of honor on board description and make the craft, equipments movement of whole factorieses get an overall control.the living creature processing part of the plc3 station cont

33、rol is the whole wastewater treatment of key part, be limited by space, only with the plc3 stand of program design for example.21process of controlthe plc3 stationses were use to control to get into pu spirit from sewage, the pond is everywhere sewage run off pu after manage spirit the whole process

34、 of the pond.include turn of sequence and time- switch moderate breezes machine of control various valve, pump, breeze machine to soon regulate etc. in this process.the pu spirit pond is the core of wastewater treatment to construct a thing, sewage is to come and go through a microbial living creatu

35、re oxygenation in the pond in addition to organic matter, the processing effect of content to sewage of the oxygen in water is to go to a pass important.request according to the sbr craft, the deliquescence oxygen in the pu spirit pond content usually controls within the scope of 13 mgs/l and annoy

36、a stage end to fuse an oxygen content in the pu should be not over the 2 mgs/l.contain the oxygen once measured low or lead gao, all will influence a fluid matter quantity.handle 4 sets of the 10 104 t the sbr of 8 pond modes to respond pond to the day, each one responds that the pond go together wi

37、th a pedestal from change pin machine control of breeze machine, used for annoying pond pu spirit to by turn provide oxygen toward two pus.establish 4 pieces of deliquescence oxygen test instruments in the different location of each pu spirit pond, measure contain of sewage amount of oxygen in pond,

38、 the plc separates a 5 mins to examine a deliquescence oxygen in a pu spirit pond value each time, according to fuse oxygen of average value to control breeze machine to turn soon.if fuse oxygen low limit at the bottom of the enactment, the frequency modulation breeze machine turns to soon increase

39、5%;if fuse oxygen gao while set upper limit, the frequency modulation breeze machine turns to soon lower 5%.so, carried out pu spirit pond to provide automatically regulate of the amount of oxygen, since avoided unnecessary energy loss, again excellent turned movement craft.22the design of plc progr

40、amthe adoptive plait distance software is a concept 2. 2 xls.concept is according to under the windows of the plc plait distance tool, have good customers interface, and have on-line follow and off-line imitate true function.the control procedure of plc3 stationses is divided into five procedure mol

41、d piece.（1）public mold pieces of procedure use-include a beginning to start to turn part, hour cent second etc. ask pulse unit, sbr to respond a period enactment, fuse oxygen enactment.etc.（2）order control mold pieces of the switch quantity -the coordination control report to the police of circulate

42、 and related breakdown of equipmentses, such as each valve, pump and breeze machine.etc. the enter of sbr pond spirit valve, enter water valve, reflux pump, surplus dirty mire pump from plc according to the craft of the wastewater treatment period time segment control, water valve from plc according

43、 to craft time and super voice liquid the measured value of the instrument to control.（3）protection mold pieces of the off-power-system power failure after, the plc saves all appearance locks and make after treating to add an electricity plc instauration keep of the appearance continue to circulate.

44、（4）mold pieces of correspondences -use to complete plc and various data transmission of place of honor machine.（5）fuse an oxygen value to automatically regulate a mold piece-according to fuse an oxygen value to regulate breeze machine to turn soon and report to the police of related breakdown.the ta

45、rget which regulates to turn soon promises the be worth of deliquescence oxygen as 2 mgs/l in the whole pu spirit period.adoptive control strategy is as follows:the pu spirit period beginning, the breeze machine at top speed movement attains a 2 mgs/l in shorterly of the hour ask by making deliquesc

46、ence oxygen and take 5 mins as a period to examine deliquescence oxygen to be worth in the meantime.when fuse an oxygen value big at the 2 mgs/l, the breeze machine turns to soon descend 5%;when fuse an oxygen value small at the 2 mgs/l, the breeze machine turns to soon rise 5%.if the breeze machine

47、 turns to soon rise to allow of tallest turn soon, fuse an oxygen value return small then maintain tallest to turn soon at the 2 mgs/l.this kind of circumstance may annoy the last phase of period to appear in the pu, but also will not clearly influence wastewater treatment quality.supervise and cont

48、rol an exportation electric current of change the pin machine value at any time in the pu the spirit of the whole period, make it not exceed change the sum of pin machine settle a value.if meet a surprised circumstance to make to output electric current exceed when the sum settle value, immediately

49、lower breeze machine to turn soon.if the breeze machine turns to soon decline to allow of lowest turn soon, output electric current to return exceed the sum settle a value, then stop breeze machine and send out to report to the police signal in the meantimealong with automatic control technical deve

50、lopment, the unitank craft more and more gets extensively applied.regard experience as principle currently, use do, time, discharge as a craft control parameter, adjust the pu spirit circulate of machine and line up mire the etc. lack accurate mathematics model to carry out the automatic control of

51、higher layer of sbr method for time.someone once put forward took the cod or the do as parameter of misty control of thought.the research direction of the automatic control of sbr method mainly is to look for several control parameters from now on, since can reflect into water of fluid matter water

52、quantity variety and reaction process in of decline a solution circumstance, and then can do for the calculator control parameter.the plc gathers in proper order control and process to control at the integral whole and have dependable sex gao, usage convenience, vivid, set net simple of the characte

53、ristics be the emollient tool of the small scale industrial automation in the realization.in the wastewater treatment, according to plc control system at solid sex, credibility, accurate sex etc. dint a but satisfied a design a request, promised wastewater treatment of smoothly progress.because of i

54、nternet fast development, hope can come to visit to ask wastewater treatment factory through an internet of from control system, the internet which needed to input users name and password and then can carry out long range came to carried on a control to the equipments of whole factorieses.transport

55、the sewage data of wastewater treatment factory to the national environmental protection bureau through an internet in the meantime city environmental protection bureau perhaps, for the purpose of the bu class management of section to wastewater treatment factory.基于plc的控制系统在供电系统中的应用介绍了以plc为核心的分布式控制系

56、统在供电系统系统中的应用。具体叙述了控制系统的结构、任务分配及实现、控制方式和程序设计思想.控制系统采用集中监测管理、分散控制的方式，上位机负责现场设备的远程控制和监视，软件采用intouch7. 0编制。plc本地站负责对具体的工艺、设备、主要被控参数进行控制及采集各种运行数据，程序设计采用具有在线跟踪和离线仿真功能的concept 2. 2xl软件。上位机与plc之间采用组网简单、运行速度快、通信稳定性强的mb+网 。整个控制系统成功地解决了plc在供电系统中的自动化控制问题，提高了供电系统设备运行效率和管理水平。近年来，为了实现高质量、低消耗、稳定可靠的运行。国内外许多供电系统厂采用了现

57、代先进控制技术和计算机技术，从而构成计算机监督、控制、管理系统.使系统优化运行。而可编程逻辑控制器（plc）则是以微处理器为核心。综合了计算机技术自动控制技术和通信技术而发展起来的一种新型、通用的自动控制装置。具有结构简单、性能优越、可靠性高、灵话通用、易于编程、使用方便等优点等。银川市第一供电系统厂采用了sbr工艺及以plc为核心的控制系统，日处理供电10 x 104 t处理后的达标供电可用于农业灌溉。1控制系统结构控制系统采用“集中监测管理，分散控制”的方式。模拟屏、上位机、集线器、打印机位于中控室，二台plc位于控制现场。采用这种结构可使生产过程中的信息能够集中管理，以实现整体操作、管理

58、和优化。同时，也使得控制危险分散，提高系统可靠性。1.1上位机 中控室的两台上位计算机采用pii级工控机，运行windows nt操作系统。上位机负责现场设各的远程控制(全自动控制、自动控制、点动控制)和监视，利用intouch7. 0工程软件包提供良好的人机对话界而，以查询方式从plc获取有关参数和设备状态信息，以棒图形式在crt上直观显示出来，同时打印必要的数据，供主控及管理人员指导生产。监控界而包括系统总图、系统分图、模拟量一览表、参数设置、报警窗、历史趋势、登录窗等界而.在系统总图里，运行人员能够监视所有控制设备的运行状态、设备事故及液位、流量等信号.在系统分图里，操作人员能够对所有控

59、制设备进行单机点动运行操作、成组自动运行操作或全厂全自动操作并监视。同时上位机2兼做编程器.中控室另设置一个镶嵌式模拟屏，由上位机1控制，用以直观显示全厂工艺流程及主要参数值。1.2plc站 根据供电系统的二部分，现场设备的远程控制输出和现场信号采集由二个plc木地控制站完成。plc1本地控制站控制格栅、供电提升泵房、曝气沉砂池等预处理部分。plc2本地控制站控制污泥脱水、压滤机等部。plc3本地控制站控制sbr生物处理部分.另外，在现场本地控制站各设1台操作终端设各，负责在本地对现场设各的控制(自动控制、点动控制)。 现场各个监控点的物理参数，包括水位、温度、流量、转速、电流等模拟量，由对应的一次仪表传感器或变送器检测出来并转变为420 ma电流信号，经屏蔽电缆送到各个子系统的plc内，由plc通过各种模块接口采样电信号。同样，模拟量控制信号由plc输出后以420ma电流形式送到执行机构，控制执行机