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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. Introduction Substation Automation Systems (SASs) are widely used in substations to improve the reliability of power systems [1]. The success of a Substation Automation System (SAS) relies on the use of an effective communication system to link the various protection, control, and monitoring elements within a substation [2]. There are large numbers of protocols for communication, a matter that has lead to the problem of devices from different manufacturers and even devices from different generations of the same manufacturer cannot be able to communicate with each other [3]. IEC 60870-5-103 was published by IEC in 1997 aimed to interoperability, but it failed [4].Then, IEC 61850, an international standard for universal communication, was published completely by International Electro technical Commission's Technical Committee 57 (TC57) in 2005[4]. Unlike previous communication protocol, IEC61850 uses the abstract communication service interface (ACSI) and specific communication service mapping (SCSM) definition method. The most abstract data structure and abstract communication service are mapping to Manufacturing Message Specification (MMS), however MMS has high abstraction, and many 61850 ACSI services are mapped to one mms service [5]. At the same time there are many fuzzy definitions even mapping deviation, different vendors may have inconsistent understanding to the standard, this is harmful to the conformance and interoperability. There are some researches about IEC61850 Control Class Model [6-7], Reference [6] gives some research about the 61850 control class model; Reference [7] gives some research about the SBO control with enhanced security and its application, but not providing other three types of control model; Both Reference [6] and Reference [7] do not provide the actual realization, engineers can not have a clear and precise understanding to the realization. This paper provide detailed analysis and discussion about IEC 61850 control class model, and firstly give the realization based on mms-ease-lite of SISCO Company, at the same time supply the

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