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Power Transmission and DistributionMedium voltage
Optimized Energy Exchangein Primary Distribution Networkswith DC-Links
Uwe Krebs, Product Manager SIPLINK
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany2s
Definition of „Optimized Energy Exchange“
Optimized Energy Exchange = controlled load flow
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany3s
System design
Optimized Energy Exchange = controlled load flow
Network 1 Network 2
IGBT-Converterspulse frequency 3kHz
Q1 Q2
P
Network 1 Network 2SIPLINK
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany4s
Working principle
vCvcp
XC i
∆v
∆v
vC vcp
vC
i
vC vcpvcp ∆v vcp∆v
vC
iBi iiW
without load capacitive load inductive load inductive load +active power flow
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany5s
SIPLINK Control
P
UDC
I1
Closed loop control
Converter 2
Closed loop control
Converter 1
U1, I1 U2, I2
UDC / Q1
UDC / U1or
P / Q2
P / U2or
Open loop control
U2
with power generation
without power generation(isolated network)
Network 2:
Q1 Q2
Network 1 Network 2I2
U1 U2
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany6s
Network Application
Extended inductively earthed systems Extended inductively earthed systems exceeding the permissible capacitive exceeding the permissible capacitive earth fault currentearth fault current
Different starpoint treatments in Different starpoint treatments in distribution systemsdistribution systems
Limited short circuit capabilityLimited short circuit capability
Different frequencies of networksDifferent frequencies of networks(60, 50, 16 2/3 Hz)(60, 50, 16 2/3 Hz)
Separation of networks with disturbed Separation of networks with disturbed power supply from other distribution power supply from other distribution systems
Netw. II
Netw. I
≈
=
=
≈
systems
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany7s
Benefits
DC-Link
Controlled power transfer / exchange Controlled power transfer / exchange between different distribution networksbetween different distribution networks
Cost savings by “Load Optimization”Cost savings by “Load Optimization”
Improvement of power quality: Improvement of power quality: -- More reliable power supplyMore reliable power supply-- Stabilization of voltage by generationStabilization of voltage by generation
reactive powerreactive power
Investment cost cutting by alternative Investment cost cutting by alternative solutions in network extensions specifically solutions in network extensions specifically in high loaded areas in high loaded areas
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany8s
SIPLINK Basic Designs
Network 1U1, f1
≈=
Q1≈=
Q2
P
≈=
≈=
Mas
ter ≈
=
≈=
Mas
ter
Sla
veS
lave
Sla
veS
lave
...
...
≈=
Q21
P2
≈=
≈=
≈=
Q22M
aste
r ≈=
≈=
Mas
ter
Sla
veS
lave
Sla
veS
lave
≈=
Qn1
Pn
≈=
≈=
≈=
Qn2
Mas
ter ≈
=
≈=
Mas
ter
Sla
veS
lave
Sla
veS
lave
...
...
...
...
...
...
Q11
Q12
P1
Network 2U1, f1
1,2 MVA2 .. 5 MVA up to 30 MVA
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany9s
Load flow control betweenon-board network and shipyard network
sSIPLINKAdvanced Power F low Control
Network 1U1, f1
≈=
Q1
P
≈=
Q2
Network 2U1, f1
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany10s
Load flow control betweenon-board network and shipyard network
• Power supply from the 400V, 50Hz shipyard-networkinto the 440V, 50/60Hz on board-network
• Reverse power supply from the 440V, 50/60Hz on board networkinto the 400V, 50Hz shipyard-network (Generator test)
Optional in operation with:
rot. converter / shipyard-network
Active Power
Distribution network
on board-network
LSIP INK
Active Power
ReactivePower
Distribution network
on board-network
G
3/50Hz, 450V
3/60Hz, 450V
Shipyard-network3/50Hz, 400V
SIPLINK
3/50Hz, 440V
3/60Hz, 440V
MSIPLINK G
3/60Hz, 440V
Active Power
ReactivePower
Shipyard-network3/50Hz, 400V
Shipyard-network3/50Hz, 400V
ReactivePower
3/50Hz, 440V
Isolated network
on board-network
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany11s
Load interchange in distribution networks
Network 1U1, f1
≈=
≈=
≈=
≈=
Mas
ter ≈
=
≈=
Mas
ter
Sla
veS
lave
Sla
veS
lave
...
...
Q1
P
Q2
Network 2U1, f1
Joint Chapter Meetings of the IEEE IAS PELS IES PES, May 12th-14th 2004, Berlin, Germany12s
Load interchange in distribution networks
110
115
120
125
130
08:29
:59 08
:44:59
08:59
:59 09
:14:59
09:29
:59 09
:44:59
09:59
:59 10
:14:59
10:29
:59 10
:44:59
10:59
:59 11
:14:59
11:29
:59 11
:44:59
11:59
:59 12
:14:59
12:29
:59 12
:44:59
12:59
:59 13
:14:59
13:29
:59 13
:44:59
13:59
:59 14
:14:59
14:29
:59 14
:44:59
14:59
:59 15
:14:59
15:29
:59 15
:44:59
15:59
:59
Time
Net
wor
k lo
ad [M
W]
0
10
20
SIPL
INK
load
[MW
]
LimitLoad with SIPLINKLoad without SIPLINKSIPLINK load
„We were in a position to invest in new technology despite the tough Economic climate. The Siemens system allows us to utilize existing energy and capacity reserves at times of peak demand without having to buy in costly regulating energy“
Jürgen Schäffner, Chief technical officer of SWU Energie GmbH