elecrtical drives and control
TRANSCRIPT
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3 phase induction motor drives
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V=2ΠfTφKW
φ V/F Low frequency operation at constant voltage:
V constant; f decrease ; φ increases
High frequency operation at constant voltage:
V constant ; f increase ; φ decrease
STATOR FREQUNCY CONTROL(contn….)
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f increase ; N increase ; Tmax decrease
V increase; ; Tmax increase
V/f control(contn….)
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(contn….)
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Applications: · heating, · ventilation, · air conditioning systems, · waste water treatment plants, · blowers, · fans, · textile mills, · rolling mills, etc
(contn….)
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The variable frequency and variable voltage can be obtained by,
Volatge source inverter(VSI) Cycloconverter control
variable voltage and variable frequency(v/f) (contn….)
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VSI(contn….)
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VSI
.
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If regeneration is necessary, the phase controlled bridge rectifier is replaced by dual converter
Different schemes of VSI
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Due to chopper ,the harmonic injection into the ac supply is reduced
Different schemes of VSI
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Variable current and variable frequency (CSI) (contn….)
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Input voltage kept constant output current depends upon the nature of load
current source inverter(CSI) (contn….)
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Different schemes of CSI(contn….)
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Different schemes of CSI(contn….)
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Closed loop control of CSI fed IM
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T
ns~nNL
T
nr
1
nr
2
nr
3
n
nr1< nr2< nr3 R1
R2 R3
R1< R2< R3
Rotor resistance control(contn….)
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An electronic chopper implementation is also possible as shown below but is equally inefficient.
Static rotor resistance control(contn….)
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Closed loop control static rotor resistance(contn….)
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Slip power recovery Instead of wasting the slip power in the rotor
circuit resistance, a better approach is to convert it to ac line power and return it back to the line. Two types of converter provide this approach:
1) Static Kramer Drive - only allows operation at sub-synchronous speed. 2) Static Scherbius Drive - allows operation above and below synchronous speed
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Conventional kramer sysytem(contn….)
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Improved version of kramer system(Ns to half of Ns) (contn….)
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Improved version of kramer system(zero to Ns) (contn….)
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Static kramer system(contn….)
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Large pumps Fan type loads
Appliaction(contn….)
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Closed loop control of static kramer system(contn….)
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(contn….)
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Modified kramer system(contn….)
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Scherbius system(conventional scherbius system) (contn….)
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Static scherbius system(contn….)
slip power –rectifier-inveter-transformer-supply
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Supply-transformer-rectifier-inverter-rotor circuit(contn….)
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Closed loop control of scherbius sytem(contn….)
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Cycloconverter static scherbius(contn….)
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