LTE network performance in latency-sensitive control applications
Polunin, Fedor (2018)
Diplomityö
2018
School of Energy Systems, Sähkötekniikka
Kaikki oikeudet pidätetään.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2018110547313
https://urn.fi/URN:NBN:fi-fe2018110547313
Tiivistelmä
In this thesis, a study has been carried out to investigate the possibility of using a Long Term Evolution (LTE) radio access network (RAN) as a communication medium for a microgrid protection system.
First, requirements for microgrid protection system communication channel are outlined based on International Electrotechnical Commission (IEC) 61850-5 standard.
Then, two test cases are carried out in a private LTE network to measure one-way trip time (OTT) and other network characteristics. First case describes a partial transfer of remote power analyzer data acquisition system under LTE network. Due to the lack of a test microgrid setup with protection devices, another latency-sensitive application was used for OTT measurements. Therefore, second test case involves a series of experiments performed on a position control application with position feedback signal routed through LTE network. It is investigated how OTT depends on various factors, namely wireless network signal strength, communication protocol and network load.
Simulation model is presented for the second test case setup.
Both simulation and experiment results are presented and analyzed. Obtained LTE network mean OTT values are compared with requirements presented in IEC 61850-5. It is concluded, that with assumptions made, LTE network does not fully comply to the requirements of the aforementioned standard. On the other hand, it is stated that the latter may be unnecessarily strict for a low-voltage microgrid, thus future research possibilities are outlined to support or disprove the results of this research.
First, requirements for microgrid protection system communication channel are outlined based on International Electrotechnical Commission (IEC) 61850-5 standard.
Then, two test cases are carried out in a private LTE network to measure one-way trip time (OTT) and other network characteristics. First case describes a partial transfer of remote power analyzer data acquisition system under LTE network. Due to the lack of a test microgrid setup with protection devices, another latency-sensitive application was used for OTT measurements. Therefore, second test case involves a series of experiments performed on a position control application with position feedback signal routed through LTE network. It is investigated how OTT depends on various factors, namely wireless network signal strength, communication protocol and network load.
Simulation model is presented for the second test case setup.
Both simulation and experiment results are presented and analyzed. Obtained LTE network mean OTT values are compared with requirements presented in IEC 61850-5. It is concluded, that with assumptions made, LTE network does not fully comply to the requirements of the aforementioned standard. On the other hand, it is stated that the latter may be unnecessarily strict for a low-voltage microgrid, thus future research possibilities are outlined to support or disprove the results of this research.