250kVA Unified Power Quality Controller
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Transcript of 250kVA Unified Power Quality Controller
250kVA Unified Power Quality Controller
P. Ganesan, R. Sudeep Kumar Power Electronics Group
Centre for Development of Advanced Computing (CDAC), Trivandrum, India
[email protected] , [email protected]
250kVA Unified Power Quality Controller
Overview of the PresentationIntroduction to Power Quality Problems and Solutions
Overview of Unified Power Quality Controller
Specification of 250kVA Unified Power Quality Controller
Power circuit configuration of 250kVA UPQCConverter topology of Shunt Compensator Converter topology of Series CompensatorPower circuit
Test results and field trial of the UPQC
Conclusion
1/26
250kVA Unified Power Quality Controller
Power Quality Affected by Polluting Load
LOAD
PollutingLoad
A
B
PCC
Distorted voltagePure Sinusoidal
2/26
250kVA Unified Power Quality Controller
Two Main Power Quality Problems
Harmonics and Reactive current drawn by the loads.
Voltage Sag,Swell,Unbalance etc.
3/26
250kVA Unified Power Quality Controller
Modern Power Quality Solutions
Shunt Active Filter (STATCOM)
Series Active Filter
(Dynamic Voltage Restorer)
4/26
250kVA Unified Power Quality Controller
STATCOM
Vdc
Vpcc Isat
Vsat
Ls
CompensatesReactive CurrentHarmonic Current
5/26
250kVA Unified Power Quality Controller
Dynamic Voltage Restorer(DVR)
Vdc
VloadVdvrVgrid
CorrectsVoltage sag and Swell
Voltage unbalanceVoltage flicker
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250kVA Unified Power Quality Controller
Single Line diagram of Unified Power Quality Controller (UPQC)
GRID
VGRID IGRID
LOAD
Vdvr
Idvr
I FILTER
Vdc
Series Active Filter
Shunt Active Filter
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250kVA Unified Power Quality Controller
Power Flow Control of UPQCUnder Nominal Voltage Condition
CONTACTOR TRANSFORMER LOAD
SHUNTAF
SERIESAF
3 Phasegrid
Supply
VOLTAGE
CURRENT
POWER
100%
100%
100%
100%
100%
100%
100%
100%
100%
0% 0%
8/26
250kVA Unified Power Quality Controller
Power Flow Control of UPQCUnder Low Voltage Condition
CONTACTOR TRANSFORMER LOAD
SHUNTAF
SERIESAF
3 Phasegrid
Supply
VOLTAGE
CURRENT
POWER
90%
110%
100%
10%
100%
110%
110%
100%
100%
100%
10%10%
9/26
250kVA Unified Power Quality Controller
Power Flow Control of UPQCUnder High Voltage Condition
CONTACTOR TRANSFORMER LOAD
SHUNTAF
SERIESAF
3 Phasegrid
Supply
VOLTAGE
CURRENT
POWER
110%
90%
100%
100%
90%
90%
10%
100%
100%
100%
10%10%
10/26
250kVA Unified Power Quality Controller
UPQC System SpecificationInput Voltage :415V, 3 Phase, +10%, -15%, 50 Hz
Output Voltage :415V, 3 Phase, +/- 1%, 50 Hz(phase voltages will be balanced)
Rating :250kVA(output load)
Power Factor :Will be maintained at near Unity at thegrid side
Configuration :IGBT Inverter 1x3 Ø bridge for shunt
Cooling :Forced Air
Ambient temperature :45o C
Enclosure :Suitable for indoor application
Digital Controller :DSP based controller
3x1 Ø bridge for series
11/26
250kVA Unified Power Quality Controller
Converter Topology
CapacitorBank
+
R
+ve Bus
-ve BusY B
Shunt Compensator
No of Switches : 6
Series Compensator
CapacitorBank
+
P
+ve Bus
-ve BusN
No of Switches : 12 ( 4 *3 )
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250kVA Unified Power Quality Controller
Power Circuit Vgr
L
O
A
D
R1
R2
C1
415V ACContactor
CR1Igr
Igy
Igb
PTVgyVgb
R
Y
B
N
C11 C12
C13 C14
C15 C16
TRX 1
TRX 2
TRX 3
PT5PT4
Vdr
PT6
VdyVdb
CR2415V ACContactor
C2
C3
C4
R3
R4
C5
C6 C8
C7
Ishr Ishy
MAIN SMPS & GATE
DRIVER SMPS
C9
C10
R5
R6
DCF/BCkt
VdcL1 L2 L3
Id1 Id2 Id3
DB1SSR 3
R7
R8
TRX 4DB2
415 V
L4
F1 F2 F3
S4-S9
SERIES ACTVE FILTER SHUNT ACTIVEFILTER13/26
250kVA Unified Power Quality Controller
Shunt compensator control Block Diagram
Current Load
magnitude Voltage Grid
+−
*dcV
dcV
cb,a,βα, LPF
+−
βα,qd,
qI l
VectorUnit
cb,a,βα,
βα,qd,
qI i
dI i +−
ωL
ωL
+−
++
++
*idV
*iqV
STATCOMCurrent
14/26
250kVA Unified Power Quality Controller
Control Scheme for Series Active Filter
Grid
IL
VLoad
Iinv IP
Load
1: N
Lf
Cf VcVdc
SA
SA SB
SB
⎟⎠⎞⎜
⎝⎛ −
∗+= VloadVload(ref)
TvcNf
CIpIinv(ref)
( )IinvIinv(ref)TiLNfL
VcVinv(ref) −∗
+=
15/26
250kVA Unified Power Quality Controller
Control Hardware18 Analog Input channels
32K word of RAM
CY7C1020
TMS 320F240
6 PWM
DSP
ADC interface(on-chip + external)
PWM Interface
FPGA12 PWM
For 3x1ØSeries
Compensator
6 PWMFor
Shunt Compensator
DACInterface
Monitoring3PWM
3 PWM
Fault Interface
I/O Interfaces
RS 232 Driver
Fault Signal
from IPM
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250kVA Unified Power Quality Controller
Digital Controller
TMS 320F240 DSPFPGA
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250kVA Unified Power Quality Controller
Performance Evaluation of 250kVA UPQC
Grid Voltage(V)
Grid Current(A)
Load Voltage(V)
Load Current(A)
Vgrn Vgyn Vgbn Igr Igy Igb Vlrn Vlyn Vlbn Ilr Ily Ilb
239 238 240 56 77 63 221 219 220 70 88 75
237 236 238 53 73 59 220 219 220 63 82 64
240 240 240 43 66 53 221 220 219 55 76 58
Readings at different load
B0.850.850.85
Grid Power Factor Load Power Factor
R B0.97 0.970.97 0.980.98
Y0.980.980.97 0.98
R Y0.78 0.820.78 0.810.80 0.82
Grid and Load Power Factor
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250kVA Unified Power Quality Controller
Performance Evaluation of Shunt Active Filter
3 Phase AC Supply
3x1 Ø Series Active Filter
1x3 Ø Shunt Active Filter
120kVA UPS withfront end 6 pulse Thyristor rectifier
Grid current before
Compensation
Grid current after
Compensation
THD3579
11
Harmonics Before HarmonicCompensation (%)
131517
9.40.72.18.20.3
1.9 2.60.1 0.4
After HarmonicCompensation (%)
4.50.40.41.9
0.21.72.30.30.3 19/26
250kVA Unified Power Quality Controller
Performance Evaluation of Shunt Active Filter
Grid Current before compensation
Grid Current after compensation
Harmonic Spectrum before compensation Harmonic Spectrum after compensation
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250kVA Unified Power Quality Controller
Performance Evaluation of Series Active Filter
Buck Mode
Vset = 210V Channel1-R phase Grid Voltage Channel2-R phase Load Voltage
Boost Mode
Vset = 270V Channel1- Y –phase Grid Voltage Channel2- Y –phase Load Voltage
21/26
250kVA Unified Power Quality Controller
Transient Response of Series Active Filter
Vset = 210V (r.m.s) to 270V (r.m.s)
Step input
Channel1 – R-phase Grid Voltage Channel2 – R phase Load voltage
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250kVA Unified Power Quality Controller
250kVA UPQC at C-DAC Lab in India
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250kVA Unified Power Quality Controller
250kVA UPQC at C-DAC Lab in India
Shunt AF Power stack
Series AF Power stack
Shunt AF Coupling Inductor
Sensors
Series AF Coupling
Transformers
Cooling Fan
Series AF LC Filter
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250kVA Unified Power Quality Controller
250kVA UPQC at C-DAC Lab in India
Shunt AF Power stack
Series AF Power stack
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250kVA Unified Power Quality Controller
Conclusions on UPQC
UPQC can mitigate Voltage sag,swell and Unbalance
UPQC can supply VAR to load
It isolates the load current harmonics from flowing to the utility
It maintains unity input power factor at all conditions
Dynamic response is fast
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250kVA Unified Power Quality Controller
Thank you
250kVA Unified Power Quality Controller