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In this paper we are discussing about a FACTS device named as UPFC (unified power flow controller). Its special features are to control active and reactive power course in a transmission line and to adjust the voltage at the bus at which it is situated. This device gives great quality flow on power system stability; these features even more considerable and perceptive that the unified power flow controller...
Hybrid simulation is important to the modern power systems which include high frequency components such as HVDC or FACTS with switching processes. Full digital model has its limit on its finite simulating frequency due to its discreteness, as a result , it's not available to describe the high frequency responses accurately and a more efficient simulating method-the digital-analog hybrid model comes...
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