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Installation of a Static Var Compensator on to an 11kV network
Jonathan Berry26.10.2011
Substation Technology 2011
Content
•Introduction
•WPD Overview
•Understanding of the problem
•STATCOM Project
•Future learning and developments
Introduction
Jonathan Berry – Innovation and Low Carbon Networks Engineer
Background in primary network and substation design
• Focussed on generation inclusion
Currently working on IFI and LCNF projects
•Working on DG inclusion and network optimisation to support the low carbon transition
Western Power Distribution
•7.6 Million customers over a 55,300 sq kms service area
•Our network consists of 216,000 kms of overhead lines and underground cables, and 184,000 substations
•LV to 132kV Network ownership
Understanding of the problem
As the level of embedded renewable generation and low carbon loads on the DNO’s network increases a core problem is created; maintaining statutory voltage levels.
Example:
An overhead network with a high level of wind generation connected:
At times of low load and high generation, network voltages move towards higher statutory limits, similarly at times of high load and low generation, voltages move towards lower statutory limits
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HV[V]
Node IDP of WT = 1,670[kW] P of WT = 1,420[kW] P of WT = 260[kW] P of WT = 0[kW]
Understanding of the problem
Understanding of the problem
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HV[V]
Node IDP of WT = 1,670[kW] P of WT = 1,420[kW] P of WT = 260[kW] P of WT = 0[kW]
STATCOM Project
Challenge
Distribution Voltage Control to mitigate the voltage fluctuation caused by variations in Load and Generation
Technology
D-STATCOM (Distribution STATic synchronous COMpensator) Trans.
X
Q (reactive power)
D-STATCOM
△V Q≒ ・ X
Inverter
DC Capacitor
Distribution network
Controller
STATCOM Project
4 Project locations:
Agreed
Tentative
Goals
Scope
Benefits
Trial D-STATCOM in rural 11kV networks to address voltage fluctuations
Identify optimum settings to achieve optimum voltage regulation
Development of D-VQC to optimise multiple networked D-STATCOMs
Strand 1 – a single D-STATCOM as a stand-alone voltage control system
Strand 2 – Three additional D-STATCOM units with a D-VQC (Voltage and Reactive Power (Q) Control System) to network devices and optimise across two primary substations
Improvement of power quality, mitigation of voltage spikes issues Increase of network stability, efficiency and load capacity Learning process will have a direct impact on the operation of a
DNO’s distribution system Inform DNO’s business case for alternative responses to network rebuild
STATCOM Project
SubstationSubstation SubstationSubstation
11kv over-head line11kv over-head line
Wind FarmWind Farm
D-STATCOMD-STATCOM
Networkopen pointNetworkopen point
Strand 1
STATCOM Project
5600
5800
6000
6200
6400
6600
6800
7000
0 60 120 180 240 300
Time (sec)
Dis
trib
utio
n Li
ne V
olta
ge (
V)
-450
-300
-150
0
150
300
450
600
Q (
kvar
)
Line Voltage with D-STATCOM
D-STATCOM Q
SVR2 tap
Line Voltage without D-STATCOM (estimation)
-195kVar
-100kVar
60 sec6250V
6515V tap 4
tap 3tap 2
D-STATCOM operation
SVR operation
DG sudden power change
STATCOM Project
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HV[V]
Node IDP of WT = 1,670[kW] P of WT = 1,420[kW] P of WT = 260[kW] P of WT = 0[kW]
STATCOM Project
TerminalTerminal TerminalTerminal TerminalTerminalLDCLDCLDCLDC
SensorSensor
CntlCntl
D-STATCOMD-STATCOM
Tap positionTap positionTap positionTap position
Strand 2
STATCOM ProjectA supervisory and control system for distribution system considering distributed generators to maintain power quality
State estimation- Load current- System voltage
Optimal controlparameter decision- Q(var), Tr.tap, …
System modeling- Network- Load profiling
Simulation/Analysis- Power quality- Power flow
Monitoring- P, Q, V, I
System DB- Line impedance,
configuration- Load, DG, …
Voltagecontroller- D-STATCOM- SVR- LBC
Line
vol
tage
Feeder lengthS/S
Voltageviolation
TimeDG stop
Voltage dip
Flicker
End
Line
vol
tage
Concept of supervisory and control system
Future learning and developments
Conclusion and next steps
Voltage control is key to ensuring system stability in networks where there is embedded renewable energy generation and varying power demand
Further development and product optimisation
Policy discussions around network inclusion, ownership and operation