Communication Service Interface Research Articles

New method to analyse delay of DDS and MMS in substation communication

As the standard specification for substation, IEC61850 utilises the abstract communication service interface to map to the manufacturing message specification (MMS) to communicate between the substation level and the bay level. The conventional MMS adopts the client/server model, which results in a relatively large transmission delay. In order to solve this problem, the data distribution service (DDS) is used to replace MMS for its excellent reliability and timeliness. However, the communication law and mechanism of DDS have not been known which result in the insufficient application of DDS. An end-to-end (ETE) delay method is proposed to divide the communication process into different parts according to the sequence in time and analyse the ETE delay of each part. By this method, the delay law and difference of DDS and MMS are analysed and summarised. The simulation results by the optimised network engineering tool software validate that DDS has a smaller delay than MMS. Therefore, DDS can better meet the timeliness of intelligent substation.

The Research, Realization and Application of IEC61850 Control Model for HVDC Project

IEC61850 uses the abstract communication service interface (ACSI) and specific communication service mapping (SCSM) definition method. Most of data structure and communication service are mapping to Manufacturing Message Specification (MMS), but MMS has high abstraction, many 61850 ACSI services are mapping to one mms service [6]. At the same time there are many fuzzy definitions even mapping deviation phenomena, different vendors may have inconsistent understanding to the standard, this is harmful to the conformance and interoperability. The Control Class Model is an important functions in IEC61850 ,this paper provide analysis and comparison to the 61850 Control Class model and based on these, for the first time gives realization based on mms-ease-lite of SISCO Company , detailed explanations of actual telegram which is helpful to eliminate understanding difference and achieve interoperability. System test uses popular software to simulate as server, and the widely used network protocol analyzer software Omicron IED Scout is used to capture packets, the result verifies our implementation satisfy the functionality, conformance and interoperability.

IEC 61850 Modeling of DSTATCOM and XMPP Communication for Reactive Power Management in Microgrids

Intermittency of renewable energy resources makes reactive power management a challenge in microgrids. Since standards do not recommend the use of distributed energy resources (DERs) for voltage regulation and reactive power management in microgrids, therefore, traditionally, locally controlled Distribution STATic COMpensators (DSTATCOM) are widely used. The management of reactive power requirement in microgrids can be improved through communication-based coordinated operation of DERs and DSTATCOM. To make this communication standardized and interoperable, this paper presents modeling of DSTATCOM as per IEC 61850 and an eXtensible Message Presence Protocol (XMPP) for providing scalability and information security. The mapping of IEC 61850 Abstract Communication Service Interface services over MMS ASN.1 XER (XMPP—web protocol) to transform the basic MMS type message into an XML message for their use in XMPP communication is also demonstrated.

The Research, Implementation and Telegram Analysis of IEC61850 Services Mapping to MMS Read

IEC61850 uses the abstract communication service interface (ACSI) and specific communication service mapping (SCSM) definition method. Most of data structure and communication service are mapping to Manufacturing Message Specification (MMS), but MMS has high abstraction, many 61850 ACSI services are mapping to one mms service [6]. At the same time there are many fuzzy definitions even mapping deviation phenomena, different vendors may have inconsistent understanding to the standard, this is harmful to the interoperability. This paper provide analysis and comparison to the 61850 ACSI services mapping to the MMS read, including GetDataValues, GetDataSetValues, GetBRCBValues and so on, and based on these, firstly gives implementation using the mms-ease lite of SISCO Company and detailed explanations of actual telegram. Our research is helpful to eliminate understanding difference and achieve interoperability. System test uses multiple popular software of different company to simulate as server, and the widely used network protocol analyzer software Omicron IEDScout is used to capture packets, the result verifies our implementation satisfy the functionality and interoperability.

Role-based access control for substation automation systems using XACML

There has been an increasing need for accessing data of internal equipment and devices of a substation system from external systems as power grids evolve. This has also introduced growing concerns on data security. In response to the concerns, IEC 62351 has proposed role-based access control (RBAC) for substation automation. In this work, we present a novel approach for implementing RBAC based on IEC 62351 for substation automation using eXtensible Access Control Markup Language (XACML). We integrate the approach with IEC 61850 by extending Abstract Communication Service Interface (ACSI), Manufacturing Message Specification (MMS), and System Configuration Language (SCL). A major advantage of the approach is that it fully conforms to both IEC 61850 and IEC 62351 and highly compatible with SCL as both XACML and SCL are XML-based. We implement the approach using OpenIEC61850 which is an open source library for ACSI services and demonstrate the implementation.