Design And Implementation Of Smart Substation Synchronized Phasor Measurement Unit

With the rapid development of China's smart grid construction, the role of Wide Area Measurement System (WAMS) becomes much more important. As a significant component of WAMS, synchronized Phasor Measurement Units (PMUs) are widely distributed in traditional plants and substations. But with the intellectualization of substations, it is much harder for traditional PMUs to integrate in. So it is necessary to develop a new kind of PMU which can be used in smart substation.Since IEC 61850 standard is the theoretical foundation of smart substation, its core idea and technical characteristics are summarized in this thesis with the intensive study of this standard. Modeling process is expounded particularly, and the ACSI model of PMU is established according to the new functional requirements of PMU in smart substation. Substation Configuration description Language (SCL) is adopted to describe this model, and the mapping of ACSI model to MMS protocol is specified.Modular software framework design scheme is proposed to implement the PMU logical model. This scheme is designed base on QNX Neutrino RTOS, the multi-process collaboration architecture is accepted, and its inter-process communication scheme is designed for this. With deep analysis of SISCO's MMS-EASE Lite software package, the MMS server architecture of PMU is established to implement the MMS services, such as data-value read/write and file transfer services. This package is also used to dynamically decode the GOOSE messages and 9-1/9-2 sampled value messages. In the parsing process, the mapping of memory spaces between MMS-EASE Lite and user software is proposed. Finally, an application named IEC61850Client is applied to verify the functions of PMU's MMS server, and Wireshark to verify the correctness of decoding.