DSTATCOM
#1

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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
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#2
(28-03-2011, 02:13 PM)seminar class Wrote: 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

Reply
#3

DSTATCOM (Distribution Static Compensator)


.pdf   DSTATCOM.pdf (Size: 492.88 KB / Downloads: 25)

When the STATCOM is applied in distribution system is
called DSTACOM (Distribution-STACOM) and its configuration
is the same, or with small modifications, oriented to a possible
future amplification of its possibilities in the distribution network
at low and medium voltage, implementing the function so that we
can describe as flicker damping, harmonic filtering and hole and
short interruption compensation.
Distribution STATCOM (DSTATCOM) exhibits high speed
control of reactive power to provide voltage stabilization, flicker
suppression, and other types of system control.
The DSTATCOM utilizes a design consisting of a GTO- or
IGBT-based voltage sourced converter connected to the power
system via a multi-stage converter transformer.
The last structure shows the circuit of the three-leg
VSC with neutral clamped dc capacitor. The neutral of the
load and the neutral of the dc capacitors are connected
together. If the load is unbalanced, the load current will
have a zero sequence component and the compensator will
be required to supply this zero sequence component. As
there is a path for the zero sequence component to return to
the compensator, the compensator will be able to
compensate for unbalanced loads.
The final choice of the dc capacitor value for the
DSTATCOM will depend on the energy storage for the
transient ride through support that the DSTATCOM is
required to provide to the main ac system.
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