28-03-2011, 02:13 PM
dstatcom.ppt (Size: 2.88 MB / Downloads: 235)
Power Distribution
Reactive power
Apparent power
Active power
Problems in power distribution
High Reactive Power Burden
High harmonic currents
Unbalanced loads
Excessive neutral currents
Shunt compensation
Principle of shunt compensation
Vs = v1+j i1 x/2
V2 = vr+j i2 x/2
Ps = I Vs I. I V1 I.sin $/2 /x/2
PR = I VR I. I V2 I.sin $/2 /x/2
In mid point, V1= V2
Phasor diagram
Shunt compensators
Thyristor controlled reactor
Thyristor switched capacitor
Static VAR compensator
Advanced static VAR compensator
Thyristor controlled reactor
Thyristor switched capacitor
Static compensator
continued
continued
In 3 phase 3 wire
3 phase 4 wire
continued
implementation
V-I characteristics
comparison
ADVANTAGES
POWER FACTOR TO UNITY
HARMONICS CURRENT COMPENSATION
LOAD BALANCING
DISTRIBUTION LINE VOLTAGE REGULATION
COMPENSATION OF NEUTRAL CURRENT