aptd-tcbr (1)
TRANSCRIPT
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THYRISTOR CONTROLLED BRAKING RESISTOR
MALAVIYA NATIONAL INSTITUTE OF TECHNOLOGY JAIPUR
SUBMITTED BY:Roopmati Meena
2012UEE1460Deepesh Haldania
2012UEE1043
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Basic Concept•It’s shunt connected thyristor switched linear resistor. •The best location for a TCBR is near a generator that would need braking during transient instability conditions. Transformer tertiary at or near the generator bus would be desirable.
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TCBR can be connected either in star or delta formation although delta connection would be more convenient since the ground path would not be needed.
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Functions of TCBR
• Prevent transient instability during the first power system swing cycle, by immediately taking away the power that would otherwise be used in accelerating the generator.
• Enhance damping to prevent dynamic instability involving low frequency oscillations between interconnected ac systems.
• Facilitate synchronizing a turbine-generator.
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Transient State Stability
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Conti….
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Speed Deviation• The resistor is switched on when the filtered speed
deviation of a particular oscillation to be damped is positive, and the TCBR is switched off when the speed deviation is negative.
• Since the resistor only consumes power and does not supply power, it helps to serve as a brake when the speed is higher than normal but doesn’t counter increase in speed when the speed is lower than normal.
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The speed deviation signal is essential to the correct exploitation of the TCBR.
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Power system Swing Oscillation• The speed deviation derived from the turbine-generator
plant can be filtered through a low-pass filter to derive the low-frequency signal for controlling the low-frequency oscillations.
• It is seen that these pulses are wide, corresponding to the low-frequency time period.
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Conti…• Figure shows the load pulses corresponding to the
unfiltered speed deviation input. It is evident that such a signal will essentially result in damping the low-frequency oscillation until the low-frequency swing is small enough for the unfiltered signal to frequently cross the zero line.
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• It is seen that because a thyristor will turn off only when its current reaches zero, the TCBR conduction will last for about a half-cycle longer with decreasing power during that extended period beyond time tB1.
SWITCHING TECNIQUES
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THANK YOU