IEC 61850-9-2 Process Bus Communication Interface for Light Weight Merging Unit Testing Environment

• Main Author: Zhao, Pengcheng
• Format: Others
• Language: English
• Published: KTH, Industriella informations- och styrsystem 2012
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103283

IEC 61850 is an international standard for communication networks for substation [1]. As a part of the IEC 61850 series, IEC 61850 Part 9-2 was introduced in 2004 and updated to a stable version in 2011 [2]. Part 9-2 de nes the specfic communication service mapping for the transmission of sampled values from process equipment [3]. The interface between process equipment and bay level devices is named as Merging Unit (MU) [4]. The 9-2 standard is a newly updated standard which has not yet been implemented in large scale. Therefore it is new or unfamiliar to many engineers working with substation automation systems. A project which is aimed to develop a light weight IEC 61850-9-2 MU testing environment is conducted in ICS department in KTH. The project can be also referred as "soft" MU project and consists of two parts. Part A is to implement conventional power system model, instrument transformer, and analog to digital converter [5]. This thesis project is Part B of the light weight merging unit (MU) testing tool project. This project is focusing on developing the 9-2 process bus communication interface for the "soft" MU project. The digitalized measurements such as current and voltage from Project A are encoded into 9-2 sampled values (SV) Ethernet stream by the process bus interface. The project is executed in the following steps. Firstly, the interface is programmed by C language under Linux environment. Secondly, the process bus communication interface is embedded into Matlab so that Part A and Part B can be combined as one system. To evaluate the light weight IEC 61850-9-2 MU testing environment, the "soft" MU is connected to a process bus network with one IED. The IED used in this thesis project is RET 670 which is a product of ABB Substation Automation. The four steps over current protection and two Windings transformer dierential protection in RET 670 is tested. The evaluation work is also demonstrated in this report.