three-power bus 中文意思是什麼
three-power bus
解釋
有蓄電池及內燃機的無軌電車-
Abstract : this article retrospects the development of sequence control system in thermal power plants at home and abroad ， especially introduces the three developmental stages of sequence control system in china over the past 35 years ， i. e. ： 1. starting stage ； 2. the second stage with programmable logic controller ( plc ) as core hardwares ； and 3. the third stage with sequence control systems of main and auxiliary equipment incorporated into the distributed control system ( dcs ) and with field bus control system ( fcs ) got involved. this article also appraises the features of sequence control system composed of different configurations and looks forward to the developmental tendency of this system for the next century
文摘:回顧國內、外火電廠順序控制系統的發展，特別介紹35a來我國順序控制系統經歷的起步階段、以程序控制器（ plc ）為核心硬體的中期階段和主、輔機順序控制系統融入分散控制系統（ dcs ）階段、現場總線控制系統（ fcs ）介入階段，並對由不同形式組成的順序控制系統的特點進行評價，展望下一世紀該系統的發展趨勢。 -
According to the request of this subject, we have developed the system hardware and software for the slave device and the inspection software running on the pc. in this paper all of the followings is illustrated detailedly, such as the research on the principles of measurement and its realization, three means of water - level measurement that are separately based on photo electricity coder, pressure sensor and potentiometer ; selection of the microchip, we choose an advanced integrated soc ( system on chip ) microchip c8051f021 as the main controller ; realization of signal sampling, processing and its conversion in the mcu ; application of high precision 16 bits adc cmos chip - - ad7705 in our system, designing its interface with the microchip and relevant program ; using a trickle charge timekeeping chip ds1302 in the system which can provide time norm and designing of its i / o interface and program ; additionally, a 4 ~ 20ma current output channel to provide system check - up using ad421. in the system, ad421, ad7705 and the microchip compose spi bus ; to communicate with the master pc, here we use two ways which are separately rs232 and rs485 ; moreover, there are alarm unit, keyboard unit, power supply inspection unit and voltage norm providing unit in the system
針對研製任務的要求，課題期間研製了下位機系統硬體和軟體，開發了上位機監控軟體，其中所作的具體工作包括：測量原理的研究和在系統中的實現，在本次設計中用三種方法來進行水位測量，分別是旋轉編碼器法、液位壓力傳感器法和可變電阻器法；主控晶元的選擇，我們選用了高集成度的混合信號系統級晶元c8051f021 ；實現了信號的採集和處理，包括信號的轉換和在單片機內的運算；高集成度16位模數轉換晶元ad7705在系統中的應用，我們完成了它與單片機的介面設計及程序編制任務；精確時鐘晶元ds1302在系統中的應用，在此，我們實現了用單片機的i o口與ds1302的連接和在軟體中對時序的模擬，該晶元的應用給整臺儀器提供了時間基準，方便了儀器的使用；另外，針對研製任務的要求，還給系統加上了一路4 20ma模擬信號電流環的輸出電路來提供系統監測，該部分的實現是通過採用ad421晶元來完成的，本設計中完成了ad421與單片機的spi介面任務，協調了它與ad7705晶元和單片機共同構成的spi總線系統的關系，並完成了程序設計；與上位機的通信介面設計，該部分通過兩種方法實現： rs232通信方式和rs485通信方式；系統設計方面還包括報警電路設計、操作鍵盤設計、電源監控電路設計、電壓基準電路的設計。 -
The conventional rectifiers produce harmonic problem in power system. while three - phase pwm voltage source rectifiers ( vsr ) can provide constant dc bus voltage and get low harmonic distortion of input current. it also has line power feedback capability
傳統的整流裝置是電網污染的主要來源，三相電壓型pwm整流器具有輸出電壓恆定、能實現單位功率因數運行的特點，甚至可以實現電能回饋電網。 -
The software has tested reliability and reliability worth indexes for composite power system on ieee 24 bus reliability test system, and compared the economic efficiency of three active power correction strategies. finally, the results indicate that the charge of active power correction strategy thinking over adjustment cost will reduce. the conclusion is consistent with expectant research
本論文以ieeerts - 96為例進行了算例分析，並對三種有功校正策略的經濟性進行了比較，計算結果表明了考慮調節成本后的校正策略，其費用得到降低，同預期研究吻合。 -
If by their ticket enforcement agencies use the power, control valves can be divided into pneumatic, electrical, fluid movement three, namely to compressed air to power sources pneumatic - valve to call for the engine electric control valves for the liquid medium ( such as oil ) pressure - driven electricity fluid moving control valves, and their functions and characteristics hours are electromagnetic valves, electronic style, smart, floor bus - control valves
如果按其所配執行機構使用的動力，控制閥可以分為氣動、電動、液動三種，即以壓縮空氣為動力源的氣動調節閥，以電為動力源的電動控制閥，以液體介質（如油等）壓力為動力的電液動控制閥，另外，按其功能和特性分，還有電磁閥、電子式、智能式、現場總線型控制閥等。
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