基于DSP的電力遠動終端的研究

目錄

0前言……………………………………………………………………1
1概述…………………………………………………………………….2 
1.1變電站綜合自動化的國內外發(fā)展現狀……………………………2
1.2我國變電站綜合自動化的主要問題………………………………2
1.3本設計的主要任務…………………………………………………3
2數字信號處理器TMS320LF2407A與CAN總線基礎…………………7
2.1數字信號處理器TMS320LF2407A技術……………………………7
2.2 CAN總線技術………………………………………………………9
3電力參數采樣算法及分析算法………………………………………13
3.1引言…………………………………………………………………13
3.2交流采樣算法分析比較……………………………………………13
3.3離散傅立葉算法（DFT）…………………………………………15
4遠動終端系統(tǒng)的結構設計……………………………………………19
4.1 RTU的總體設計方案………………………………………………19
4.2參數采集模塊………………………………………………………20
4.3開關量輸入（遙信）輸出電路（遙控）…………………………24
4.4通信接口電路………………………………………………………25
4.5復雜可編程邏輯器件(CPLD)模塊…………………………………27
4.6存儲器擴展…………………………………………………………30
4.7顯示模塊……………………………………………………………31
4.8外圍電路……………………………………………………………32
5系統(tǒng)軟件設計…………………………………………………………35
5.1系統(tǒng)軟件總體概述…………………………………………………35
5.2通信軟件設計………………………………………………………39
6抗干擾設計……………………………………………………………44
6.1干擾信號的產生……………………………………………………44
6.2抗干擾設計…………………………………………………………44
7 技術經濟分析………………………………………………………46
8總結……………………………………………………………………47
致謝……………………………………………………………………48
參考文獻………………………………………………………………49
附錄A …………………………………………………………………50
附錄B……………………………………………………………………60

摘要

在目前國內的變電站自動化監(jiān)控系統(tǒng)中，站內電力遠動終端大部分還是采用串行口通信方式(RS232，RS485總線等)，且存在著串行通信傳輸速率慢，易受干擾且通信方式不靈活等缺點。且早期的遠動終端(RTU)以單片機作為處理器，實時響應能力和信號處理能力差，無法滿足變電站大量實時數據處理的要求。
本文就是基于這樣的前提下提出了一種新型的以分布式為基礎的電力遠動終端系統(tǒng)。本RTU智能單元是以高性能數字信號處理器TMS320LF2407A為主控制器，以CAN總線作為通信網絡構成分布式系統(tǒng)。使得遠動終端的實時響應能力、數據通信能力和信號處理能力得到大大提高。
關鍵詞：變電站自動化遠動終端（RTU）；TMS320LF2407A；現場總線CAN

Abstract

Presently in the domestic substation automation monitori ng and control syste m,the serial communica tion pattern(RS232，RS485 bus and so on) hasbeing used in most power remote operated terminal system,there still have many de fects.For exa mple,the vel ocity of trans missi on adopting serial communic ation is ve ry slow,e asily disturbed,a nd the mode i s not flexi ble.And single-chi p micr ocomputer ha s been us ed in early remote terminal unit(RTU), because of the poor ability of real-time response and si gnal process,i t couldn’t satisfy the transmission of real-time data in the substation.
On the strength of the above-mentioned pre mise,a new distributed remot eterminal unit is introduced in the paper.In the intelligent remote terminal unit the high perfor mance Digital Signal Proc essor TMS320LF2407A is regarded as the controller,CAN bus is regar ded as co mmunicati ons network to make up distributed system.The ability of real-time response,communication of the da ta and si gna l process of remote operated terminal syste m has been enha nced grea tly.At the sa me ti me the software of Kingview has been used to design the interface of monitoring and control centre.And So the system can satisfy the need of the development of the substation automation system.
Key Words:Substation Automation； Remote Terminal Unit（RTU）；TMS320LF2407A ；Field Bus CAN； Communication