外文翻譯---wincc在供熱站恒壓供水監(jiān)控系統(tǒng)中的應(yīng)用

1、<p><b>　　畢 業(yè) 設(shè) 計</b></p><p>　　外 文 文 獻 譯 文 及 原 文</p><p>　　學 生： </p><p>　　學 號： 200601020106 </p><p>　　院 （系）： 造紙工程學院 <

2、/p><p>　　專 業(yè)：過程裝備與控制工程 </p><p>　　指導教師： </p><p>　　2010年6月10日</p><p><b>　　外文原文</b></p><p>　　Wincc in Heating Supply Stations Mon

3、itoring System </p><p>　　System uses Automatic Frequency Control regulation or pump motor speed. Plus or minus pump.It is primarily by the Frequency Control System.PID regulator,pressure sensors,liquid level

4、 sensor power control circuits and other conponents.Host users control system or control board light over-the-counter transactions,buttons,switchto understand and control systen operation,Based on the PID control mode,th

5、e operator interface settings in water pressure,PLC to pressure settings and measured valucs for t</p><p>　　Systen hanlware configuration</p><p>　　The system uses Siernens S7-200 PLC and its con

6、figuration software constitute a constant WinCC V6.0 Water pressure control system,water pressure monitoring process.Industroal Ethernct controller for PLC and the operator station computer communication betwween the Rem

7、ote I/O network for the PLC and the operator station compuler communication betwween the Remote I/O network for the PLC controller and inverter,the soft starter of communication betwween equipment.PLC controller mainly u

8、sed to monito</p><p>　　Software design of Systen</p><p>　　The control system software company Siemens PCS7V5.2 package,STEP7V5.2 PLC controller mainly used to monitor and control water and elect

9、ricity systems.For 1#~4# pressurized pump converter using the ABB ACS510-031A4 inveter,HMI operatorstation selection DELL computers.computer,Industrial Ethernet server card Siemens communications company Cp1612</p>

10、<p>　　Software design of System </p><p>　　The control system software company Siemens PCS7V5.2 package.STEPV5.2 PLC controller.HMImonitoring system used WinCCV6.0 version.HMI server and operating stat

11、ion are using the Windows2000 operating system to have an open programming environment.Heating Sation Wincc configuration control software maior constant pressure water system and coal Gallery in two parts.Implemention o

12、f the system of automatic detection and automatic control.Detection constant pressure water and coal Gallcry equipment ope</p><p>　　PLC-Based Fuzzy Constant water Supply System Design Constant </p>&l

13、t;p>　　pressure water system components</p><p>　　From the water supply system programmable controller, inverter, pressure transmitter and the constact group on the pump unit and other components Programma

14、ble controller selection of AB ControlLogix system.It includes Logix5550 controller analog input modules,digital input and output modules and communication modutes.Which analog input modute used to test the water pressur

15、e on the export signal,digital input module and valves Kai stopped.Inverselection of AB 1336 Plus Inverter.Inverter and Devi</p><p>　　Constant Pressure Water Principle</p><p>　　The outlet channe

16、l of pressure sensor installation will export water pressure signals are converted to electrical signals, send PLC fuzzy inference operation, the output control signals to the converter, regulating the operation of pump

17、motor speed, until the actual elimination of hydraulic pressure and set the deviation, constant voltage supply. Programmable controller can control pumps Kai stopped. When the system started working, inverter control fro

18、m start on 1st pump frequency operation. If</p><p>　　Fuzzy2PI control algorithm</p><p>　　As the water supply system in many areas (such as the pipe network and pumps) nonlinear, time-varying, an

19、d the variables still exist between the cross-coupling, so it is difficult to establish a precise mathematical system model. For such a complicated process that merely using the conventional PID control is difficult to a

20、chieve the desired control. Fuzzy control is not dependent on the mathematical model and the right parameters sensitive to the merits, Fuzzy used to control the water supply s</p><p>　　The system uses two-in

21、put single-output fuzzy controller. to pressure the desired value and the measurement of e error and the error as a fuzzy controller input linguistic variables, transducer frequency variation u language as output variabl

22、es. To e error, the error rate ec and control volume u fuzzy subset of ( NB,NS,ZE,PS,PB) and they quantified the domain of seven grades, (-3,-2,-1,0,1,2,3). Fuzzy subset of the membership function used triangle. Initial

23、experience of fuzzy control rules, as </p><p>　　Where x, U fuzzy relationship matrix on behalf of the “Cartesian” and the “and” operator. According minimax inference rules synthesis of output variables langu

24、age domain of fuzzy sets U:</p><p>　　U Finally, the weighted average method used for solutions vague and fuzzy volume U converted into precise amount u. The process is carried out offline, eventually Fuzzy C

25、ontrol Table, as shown in table 2. This form of the PLC memory storage, real-time control, fuzzy control would streamline the process for finding inquiries on the questionnaire process.</p><p>　　Parametric S

26、election of Frequency-water system</p><p>　　a reasonable selection pressure control parameters constant pressure to achieve energy-supply system. The realization of is this objective the key is pressure cont

27、rol parameter selection, usually pipe network pressure control point two choice: a pipe network is the most negative pressure on constant pressure control and the other is the constant pressure pump outlet.</p>&l

28、t;p>　　pressure control. How will the two choices, we have to analyze simple Network pressure on the most disadvantaged constant, the water pipe network by QMAX reduced to Q1, pumps reduce speed, and water characterist

29、ic curve of A (unchanged) at the intersection point C, pump characteristic curve downward, network pressure on the most disadvantaged H0. And the pump outlet pressure constant pressure control, Ha unchanged, reduce water

30、 consumption by QMAX QI and Ha to pay to point B, water characteristi</p><p>　　the converter and put into operation after the commissioning of the system to ensure optimum operation of the state means necess

31、ary. According to the inverter load inertia size of the start and stop the motor when the time is not the same, Set time is too short to be accelerated when the inverter overcurrent, overvoltage decelerating protection;

32、Set time will lead to excessive speed converter running in the system become regulate slow, delayed response, contingency ability is poor. Yi system at </p><p><b>　　外文翻譯</b></p><p>　

33、　Wincc在供熱站恒壓供水監(jiān)控系統(tǒng)中的應(yīng)用</p><p>　　恒壓供水基本工作原理</p><p>　　系統(tǒng)采用變頻調(diào)速方式自動調(diào)節(jié)誰笨點擊轉(zhuǎn)速或加、減泵。它主要是由變頻調(diào)速系統(tǒng)、PID。調(diào)節(jié)器、壓力傳感器、液位傳感器、動力控制線路等組成，用戶通過上位監(jiān)控系統(tǒng)或控制柜面板上的指示燈、按鈕、轉(zhuǎn)換開關(guān)來了解和控制系統(tǒng)的運行。在基于PID的控制方式下，操作人員在操作界面設(shè)定供水壓力，PLC對

34、壓力設(shè)定值和測量值的偏差進行PID運算，并通過變頻器調(diào)節(jié)配水泵系統(tǒng)轉(zhuǎn)速，是供水壓力保持在設(shè)定值。</p><p><b>　　系統(tǒng)的硬件配置</b></p><p>　　本系統(tǒng)采用西門子公司的S7-200系列PLC及其組態(tài)軟件Winccv6.0構(gòu)成恒壓供水控制系統(tǒng)，實現(xiàn)供水過程的壓力監(jiān)控，工業(yè)以太網(wǎng)用于PLC控制器和計算機操作站之間的通訊，遠程I/O網(wǎng)用于PLC控制器

35、與變頻器、軟啟動器的設(shè)備之間的通訊，PLC控制權(quán)威主要用來檢測和控制供水系統(tǒng)和供電系統(tǒng)、用于1#~4#加壓泵的變頻器采用ABB公司的ACS510-01-031A4變頻器，HMI操作站選用DELL計算機，工控機。服務(wù)器的工業(yè)以太網(wǎng)通訊網(wǎng)卡采用西門子公司的CP1612.</p><p><b>　　系統(tǒng)的軟件設(shè)計</b></p><p>　　本控制系統(tǒng)軟件采用西門子公司的

36、PCS7V5.2軟件包，PLC控制器</p><p>　　采用STEP7V5.2，HMI監(jiān)控系統(tǒng)采用Winccv6.0版本，HMI服務(wù)器和操作站都采用的是Windows2000操作系統(tǒng)具有開放的編程環(huán)境.</p><p>　　供熱站使用Wincc組態(tài)軟件主要監(jiān)控恒壓供水系統(tǒng)和輸煤廊兩部分。實現(xiàn)對系統(tǒng)的自動檢測和自動控制。檢測恒壓供水和輸煤廊運行設(shè)備的各項參數(shù)，實現(xiàn)實時數(shù)據(jù)的采集、上傳、實時

37、顯示和記錄?？刂茩C組運行、故障的自動停機和報警操作。在恒壓供水系統(tǒng)設(shè)定供水壓力參數(shù)，實時監(jiān)控調(diào)節(jié)加壓泵，使供水壓力保持定值。在輸煤廊中控制給煤量和給煤速度，檢測給煤質(zhì)量（煤的粉碎成都和含雜質(zhì)量）。</p><p>　　基于PLC的模糊空盒子恒壓供水系統(tǒng)設(shè)計</p><p><b>　　恒壓供水系統(tǒng)組成</b></p><p>　　供水系統(tǒng)又可編

38、程控制器、變頻器、壓力變送器、接觸器組和水泵機組等組成?？删幊炭刂破鬟x用AB公司的ControLogix系統(tǒng)，它包括Logix5550控制器、模擬量輸入模塊、數(shù)字量輸入輸出模塊及通信模塊，其中模擬量輸入模塊用來檢測出水口壓力信號，數(shù)字量輸入模塊用來檢測各種開關(guān)量，數(shù)字量輸出模塊用來控制點擊和閥門的啟、停。變頻器選用AB公司的1336Plos變頻器，變頻器與控制器通過Devi2 ceNet網(wǎng)絡(luò)進行通信。</p><p&

39、gt;<b>　　恒壓供水原理</b></p><p>　　在出水管道上安裝壓力傳感器，將出口水壓力信號轉(zhuǎn)換為電信號，送PLC進行模糊推力運算后，輸出控制信號到變頻器，調(diào)節(jié)水泵點擊的運轉(zhuǎn)速度，知道消除實際誰呀與設(shè)定水壓的偏差，實現(xiàn)恒壓供水，可編程控制器同時控制水泵的啟、停。當系統(tǒng)開始工作時由變頻器控制啟動1號泵變頻運行。若用戶用水量增加變頻器的輸出頻率上升到50Hz水壓仍達不到設(shè)定值，則將2

40、號泵切換為工頻運行;變頻器再啟動3號泵運轉(zhuǎn)，知道輸出水壓達到設(shè)定值為止。繁殖托用戶用水量減少，則依照“先啟后?！痹瓌t一次將水泵切除</p><p>　　如此反復循環(huán)，實現(xiàn)系統(tǒng)的恒壓供水。</p><p>　　3Fuzzy2PI控制算法</p><p>　　由于供水系統(tǒng)的許多環(huán)節(jié)（如管網(wǎng)和水泵）存在非線性、時變性，且各個變量之間還存在交叉耦合，所以難以建立系統(tǒng)精確的數(shù)

41、學模型，對于這樣一個復雜的過程，僅僅用傳統(tǒng)的PID控制很難達到理想的控制效果。模糊控制具有不依賴于數(shù)學模型和對參數(shù)變化不敏感的優(yōu)點，將模糊控制應(yīng)用于供水系統(tǒng)中，可以提高控制系統(tǒng)的動態(tài)性能，但是模糊控制系統(tǒng)的穩(wěn)態(tài)性能不佳，為此設(shè)計了一種Fuzzy2PI雙?？刂疲鐖D2所示，其設(shè)計思想是：當壓力誤差較大時采用Fuzzy控制，以獲得良好的瞬態(tài)響應(yīng)；當壓力誤差較小進入穩(wěn)態(tài)后，則由程序切換到PI控制，以獲得良好的穩(wěn)態(tài)精度，PI控制算法和模糊控制算

42、法均有PLC實現(xiàn)切換時機計算機程序根據(jù)事先給定的誤差范圍自動實現(xiàn)。</p><p>　　本系統(tǒng)采用雙輸入單輸出模糊控制器，以水壓給定值和測量值的誤差e及誤差變化率ec作為模糊控制器的輸入語言變量，一變頻器頻率變化量u作為輸出語言變量。選取誤差e、誤差率ec和控制量u的模糊自己為{NB,NS,ZE,PS,PB},并將它們的論域量化為7個等級，即{-3，-2，-1，0，1，2，3}，模糊子集的隸屬函數(shù)采用三角形，根據(jù)

43、現(xiàn)場經(jīng)驗總結(jié)出模糊控制規(guī)則，如表1所示。根據(jù)這些規(guī)則計算總的模糊關(guān)系R:</p><p>　　式中x、U代表模糊關(guān)系矩陣的“笛卡爾積”和“并”運算。再根據(jù)極大極小推力合成規(guī)則求出輸出語言變量論域上的模糊集合U：</p><p>　　最后對U采用加權(quán)平均法進行解模糊，將模糊量U轉(zhuǎn)換成精確量u，上述過程是離線進行的，最終得到模糊控制查詢表，如圖2所示。將此表存放在PLC內(nèi)存中，實時控制實現(xiàn)模糊

44、控制的過程便簡化為查找查詢表的過程。</p><p><b>　　程序設(shè)計</b></p><p>　　RSLogix5000是支持Logix5000系統(tǒng)控制器的編程軟件，程序用梯形圖語言編寫，包括水泵啟動和切換主程序、PI控制子程序、模糊控制子程序和故障報警子程序，當采樣時間到時，PLC采集水壓信號，并與給定信號比較得到誤差e，若e<=e0(e0為PI和模糊控

45、制切換閥值)，則進入PI控制子程序；若e>e0，則進入模糊控制子程序。圖3是模糊控制子程序框圖。由于RSLogix5000軟件提供了數(shù)組標簽，因此可以用梯形圖語言方便地實現(xiàn)模糊控制算法。在標簽數(shù)據(jù)庫中建立一個7x7的二維數(shù)組標簽array，將查詢表2的結(jié)果按照從上倒下，從左到右的順序一次輸入到數(shù)組標簽中，由于E、Ec的量化等級為【-3，3】，而數(shù)組標簽array的其實地址為【0，0】,因此在尋址時需要加偏移量，即：u=array（

46、i+3，j+3），模糊控制器將計算得到的實測誤差e和誤差變化量ec量化，取得以相應(yīng)論域元素表征的查找查詢表所需的i和j，通過數(shù)組標簽array尋址得到控制量變化uij，uij再乘以比例因子便是控制量變化量?u。加在被控對象的實際控制量uk=uk</p><p>　　1+u，其中uk-1為前一次的控制量。uk經(jīng)過限幅后作為變頻器的輸出，控制水泵點擊的轉(zhuǎn)速，是水壓保持在給定值上。</p><p&g

47、t;　　變頻恒壓供水系統(tǒng)的參數(shù)選取</p><p>　　合理選取壓力控制參數(shù)，實現(xiàn)系統(tǒng)低能耗恒壓供水。這個目的的實現(xiàn)關(guān)鍵在于壓力控制參數(shù)的選取，通常管網(wǎng)壓力控制點的選擇有兩個；一個就是管網(wǎng)最不利點壓力恒壓控制，另一個就是泵出口壓力恒壓控制。兩者如何選擇，我們來簡單分析一下管網(wǎng)最不利點壓力恒定時。管網(wǎng)用水量由QMAX減少到Q1與Ha交與B點，用水管路特性曲線A上移并通過B點，管網(wǎng)最不利點壓力變?yōu)镠b,Hb-H0的揚

48、程差即為能量浪費，所以選擇管網(wǎng)最不利點的最小水頭為壓力控制參數(shù)，形成閉環(huán)壓力自控系統(tǒng)，是得水泵的轉(zhuǎn)速與PID調(diào)節(jié)器設(shè)定壓力相匹配，可以達到最大節(jié)能效果，而且實現(xiàn)了恒壓供水的目的。</p><p>　　變頻器在投入運行后的調(diào)試是保證系統(tǒng)達到最佳運行狀態(tài)的必要手段。變頻器根據(jù)負載的轉(zhuǎn)動慣量的大小，在啟動和停止電機時所需的時間不相同，設(shè)定時間過短會導致變頻器在加速時過電流、在減速時過電壓保護；設(shè)定時間過長會導致變頻器在