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Wams Aplications in Chinese Power Systems

Wams Aplications in Chinese Power Systems - 1999 JOHN FOXX...

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©1999 JOHN FOXX IMAGES 54 IEEE power & energy magazine january/february 2006 1540-7977/06/$20.00©2006 IEEE Authorized licensed use limited to: Universidad de los Andes. Downloaded on March 02,2010 at 20:21:22 EST from IEEE Xplore. Restrictions apply.
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january/february 2006 IEEE power & energy magazine 55 S SINCE THE FIRST GPS-BASED PHASOR MEASUREMENT UNIT (PMU) WAS INVENTED in 1988, synchrophasor technology has developed for more than a decade. During this period, many new promising concepts have been proposed and implemented, for instance, the wide- area measurement/monitoring system (WAMS). It brings great potential for upgrading the supervision, operation, protection and control of modern power systems. In China, this emerging technology also attracts great concerns because of the rapidly expanding scale of and many new challenges to Chinese power industry. In this article, we summarize the most recent development of PMU/WAMS in China, with emphasis on the basic architectures and functions of the developed system and the communication infrastructures. The future trend will also be discussed. WAMS Developments in China from 2002 to 2004 Research on synchrophasor technology in the mainland of China started in 1994. However, not until 2002 did PMU/WAMS gain abroad appli- cations. Several facts contributed to that: eight-years’ initial experience, upgrading of communication infrastruc- tures, and most of all, the publication of “The Technologic Specification of Power System Real-time Dynamic Monitoring Systems.” The specification, based on IEEE Stan- dard 1344-1995 (IEEE Standard for Synchrophasors for Power Sys- tems), standardizes the general architecture, basic functions, com- munication interfaces and other related issues of PMU/WAMS. It has greatly promoted the applica- tions of synchrophasors technology in China. During the past three years, ten new WAMS projects have been com- pleted or partly completed, 70 new PMUs have been put into service, and another 35 PMUs are under construction. They are deployed in five regional power systems (i.e., Northern, Northeastern, Central, Southern, and Eastern China power grids) and five provincial power systems (i.e., Jiangsu, Henan, Guangdong, Yunnan, and Guizhou provincial power grid). Figure 1 depicts the placement of PMUs and WAMS central stations. PMU Structure and Functions Currently, there are several manufacturers of PMUs in China, for instance, Beijing Sifang Co., Ltd., China Electric Power Research Institute (CEPRI), Nanjing Automation Research Institute (NARI), and Xuji Group Corporation. American Microdyne’s PMUs are also adopted in the WAMS of the Northern China power grid. Among these manufacturers, Sifang is the first to Authorized licensed use limited to: Universidad de los Andes. Downloaded on March 02,2010 at 20:21:22 EST from IEEE Xplore. Restrictions apply.
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produce PMUs complying with the IEEE Standard 1344 and the Chinese Specification and now owns the largest market share in China. A decentralized-structure PMU provided by Sifang is illustrated in Figure 2, which has the following func- tional modules:
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