Transactions of China Electrotechnical Society  2018, Vol. 33 Issue (11): 2520-2534    DOI: 10.19595/j.cnki.1000-6753.tces.171641
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Impact of Strong Dynamic InteractionBetween UPFC and System on Electromechanical Oscillation Mode
Ren Bixing, Du Wenjuan, Wang Haifeng
State Key Laboratory of Alternate Electric Power Systems with New Energy Resources North China Electric Power University Beijing 102206 China

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Abstract  

This paper investigated the impact of strong dynamic interaction caused by modal coupling between unified power flow controller (UPFC) and system on electromechanical oscillation modes (EOMs). A closed-loop interconnected dynamic model of multi-machine power system with a UPFC was derived, and the UPFC and the rest of system were modelled as two interconnected open-loop subsystems. Analysis in the paper indicates that when an open-loop UPFC control mode is close to an open-loop EOM of synchronous generators on the complex plane, two corresponding closed-loop modes intend to repulse each other to move approximatively towards opposite directions. Hence such modal coupling will cause damping of one closed-loop EOM to decrease heavily. The impact of strong dynamic interaction was explained clearly from the point of view that UPFC provide damping torque contribution to each generator according to damping torque analysis method. Moreover, a new quantitative index was proposed to approximately estimate the relative displacement of two corresponding closed-loop modes in complex plane under the condition of open-loop modal coupling. The New England 10-machine power system and a 500kV actual equivalent power network of Eastern China were used to demonstrate and validated above analysis and conclusions. In addition, this paper compared the effects of series and parallel voltage source converters(VSCs) of UPFC on the system, and the influence of two factors, UPFC power flow regulation and installation location, on mode coupling was also analyzed.
Key words： Unified power flow controller      electromechanical oscillation mode      dynamic interaction      open-loop modal coupling      damping torque analysis     
Received: 05 December 2017      Published: 13 June 2018
PACS: TM152  
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RenBixing,DuWenjuan,Wang Haifeng. Impact of Strong Dynamic InteractionBetween UPFC and System on Electromechanical Oscillation Mode[J]. Transactions of China Electrotechnical Society, 2018, 33(11): 2520-2534.
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