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Asinhroni Ethernet v realnem času
MUNDA, DAVOR (Author), Ciglarič, Mojca (Mentor) More about this mentor... This link opens in a new window

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Abstract
Industrijski Ethernet je postal standard za izgradnjo porazdeljenih sistemov v industrijskih omrežjih, kateri morajo omogočati predvidljive zmogljivosti in vzdrževalnost. Industrijske aplikacije zahtevajo časovno omejeno obdelavo, katero se zagotavlja s procesiranjem ali v mehkem ali v trdem realnem času. V okoljih, kjer je zahtevan determinističen odzivni čas aplikacij, je treba zagotoviti procesiranje v trdem realnem času. Protokoli Fieldbus so standard za povezovanje industrijskih naprav v omrežjih Ethernet. Protokoli Fieldbus za svoje delovanje zahtevajo sinhronizacijo in namenske strojne vmesnike, kar pušča prostor za alternativne, bolj splošne rešitve. To delo prestavlja načrtovanje, izvedbo in vrednotenje novega asinhronega komunikacijskega gonilnika v trdem realnem času, poimenovanega programski vmesnik 61850CS. Programski vmesnik 61850CS je implementiran v inteligentni elektronski napravi in omogoča IEC 61850 GOOSE Ethernet komunikacijo v trdem realnem času v razdelilnih transformatorskih postajah v elektroenergetiki. Predstavljena 61850CS implementacija omogoča sočasno Ethernet komunikacijo v realnem in v ne-realnem času preko istega strojnega omrežnega vmesnika. Predstavljena tehnologija omogoča poljuben sočasni realno časovni in ne-realnočasovni Ethernet promet. Splošna izvedba komunikacijskega vmesnika omogoča uporabo aplikacijskega vmesnika na različnih arhitekturah. Predstavljena izvedba tudi izpolnjuje zahteve za industrijske Ethernet komunikacije. In še več, ker aplikacijski vmesnik 61850CS ne vpliva na CSMA/CD mehanizem, v omrežju ni več potrebe za posebnim koordinatorskim vozliščem, ki bi pošiljalo sinhronizacijski signal po omrežju, kar občutno poveča razpoložljivi čas porazdeljenega sistema. Predstavljena rešitev je v praksi implementirana kot vmesnik API za zaščitni rele FPC 680. Rele FPC 680 je zgrajen na strojni platformi PPC440EPx z RTAI Linux operacijskim sistemom v trdem realnem času. Naprava FPC 680 je komercialni produkt podjetja Iskra d.d. in je nameščena po razdelilnih transformatorskih postajah širom sveta.

Language:Slovenian
Keywords:Industrial Ethernet, real-time, RTDM, RTnet, IEC 61850, GOOSE, electric substation, Linux
Work type:Master's thesis (m2)
Organization:FRI - Faculty of computer and information science
Year:2016
Views:1461
Downloads:463
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Secondary language

Language:English
Title:Asynchronous real-time ethernet
Abstract:
The Industrial Ethernet has become a way to build distributed systems in industrial networks which must provide predictable performance and maintainability. Industrial applications require time-critical processing, which can be guaranteed within soft or hard real-time environments, Where applications' responses require deterministic processing time, the hard real-time environment is requested. The Fieldbus protocols are the standard way to connect instruments on the Ethernet-based communication. Fieldbuses require synchronisation and dedicated application-specific integrated circuits, what leaves space for alternate, more common solutions. This thesis presents design, implementation, and evaluation of the novel Real-Time Driver Model asynchronous communication stack called 61850CS API. 61850CS stack is implemented in an intelligent electronic device to enable real-time IEC 61850 GOOSE Ethernet communications in electrical substations. The presented 61850CS implementation enables simultaneous flow of real-time and non-real-time Ethernet traffic over the same physical network interface controller. The same technology supports running arbitrary real-time Ethernet traffic and non real-time Ethernet traffic simultaneously and its implementation is general enough to enable an API use on different architectures and to comply with different industrial Ethernet requirements. And more, since 61850CS doesn't affect CSMA/CD mechanism, it doesn't need any master nodes, which increases the system availability. The presented solution was implemented as an application programming interface for feeder protection and control (FPC 680) intelligent electronic device relay. Hardware platform for 61850CS was PPC440EPx microcontroller with implemented Linux Real-Time application interface RTOS. The FPC 680 is an IED commercial product by Iskra d.d. which is implemented worldwide in several substations.

Keywords:industrijski Ethernet, realni čas, RTDM, RTnet, IEC 61850, GOOSE, razdelilna transformatorska postaja, Linux

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