reactive power management & control
TRANSCRIPT
REACTIVE POWER MANAGEMENT & CONTROL
WHAT IS REACTIVE POWER
• IN AC SYSTEM;• UTILISED FOR DEVELOPING MEGNATIC
FLUX/FIELD IN A COIL; TRANSFORMER/REACTORS/MOTORS ARE THE MAJOR CONSUMER OF REACTIVE POWER
• GENERATED BY WHEN VOLTAGE IS APPLIED ACROSS CAPACITOR; EHV TRANSMISSION LINES/ SYNCRONOUS CONDENSERS ARE THE MAJOR SOURCE OF REACTIVE POWER
REACTIVE POWER GENERATION BY EHV TRANSMISSION LINES
400kV 765kV 1200 kV
(approx.)
ROW (m) 46 64 100
Capacity (MW) Upto 600-700 Upto 2500-3000 Upto 6000-8000
Reactive generation (MVAR/100km)
60 240 600
ACTIVE POWER BALANCING
P1 P2
>
P1 P2
=
P1 P2
<
P1>P2 f>50Hz
P1=P2 f=50Hz
P1<P2 f<50Hz
G
G
G
L
L
L
REACTIVE POWER BALANCING
V1 V2
>
V1 V2
=
V1 V2
<
V1>V2
V1=V2
V1<V2
REACTIVE LOADS
REACTIVE POWER CONTROL DEVICES
• GENERATOR
• SYNCHRONOUS CONDENSERS
• SHUNT CAPACITORS
• SHUNT REACTORS
• SERIES REACTORS
• EHV LINES
SERIES CAPACITORS APPLICATIONS
• TO INCREASE POWER HANDLING CAPACITY OF A TRANSMISSION LINE
• TO IMPROVE THE VOLTAGE OF STATION BUS
• SELF REGULATION OF REACTIVE POWER
• REDUCTION IN T&D LOSSES
SVC APPLICATIONS
• TO ACHIEVE EFFECTIVE VOLTAGE CONTROL• TO BALANCE LOADING OF PHASES• TO INCREASE ACTIVE POWER TRANSFER
CAPABILITY• TO INCREASE TRANSIENT STABILITY MARGINS• TO INCREASE DAMPING OF POWER OSCILLATIONS• TO REDUCE TEMPORARY OVER VOLTAGES• TO DAMP SUBSYNCHRONOUS OSCILLATION• TO PROVIDE REACTIVE POWER TO AC-DC CONVERTERS
SERIES COMPENSATION P
V1------------- -----------------V2
V1xV2
P = Sin §
X
Thank you