1 july 2001 smes modeling and simulation benchmarking paulo f.ribeiro calvin college / bwx...
Post on 20-Dec-2015
217 Views
Preview:
TRANSCRIPT
1July 2001
SMES Modeling and Simulation
Benchmarking
Paulo F.RibeiroCalvin College / BWX Technologies, Inc
2July 2001
Outline
SMES Coil Modeling
Chopper / SMES Coil Transient Interaction
Chopper Modeling + Coil
Inverter + Chopper Modeling + Coil Modeling
Integrated Energy Storage/Power Electronics/ Supply System
Integrated System: Performance / Site Sensitivity
Integrated System: CAPS Facility - STATCOM Impact
Observations
Conclusions
3July 2001
ControllerCoil Protection
CryogenicSystem
VCoil
ICoil
DewarPower ConversionSystem CSC
orVSC + dc-dcchopper
Transformer BypassSwitch Coil
ACLine
Overall System Perspective
4July 2001
Coil Modeling - Parameters Computation
, )21
8(ln(2
0 R
RRNL
12
25tan
3
2tan
3
2)1ln(
12)1ln(
12)ln(
2
11ln 11
2
2
2
2
2
2
2
222
a
b
b
a
b
a
a
b
a
b
b
a
b
a
a
bbaR
)(
4
)](2
)()2
[()(
2221
21
21021
dRR
RRk
kEk
kKkk
RRM
d
AC r0
d
5July 2001
Coil Modeling - Assumptions
The dielectric constant of the insulating material does not vary with frequency
The thermal enclosure and the tank does not carry current, and they were represented as ground plane
A small value of resistor represents skin effect and eddy current losses.
Parallel plate model is employed to calculate ground and series capacitances of each turn.
To reduce the computing cost, each double pancake (two single pancakes) is represented by its series inductance, capacitance, mutual inductance and ground capacitances.
6July 2001
Cad
Cg
Cax
1 2 N
1
2
Nsp
Coil Modeling - Matrix Organization
Cad = Capacitance between adjacent turns within a disk coilCax = Capacitance between axially separated turns Cg = Capacitance between a turn and groundN = number of turns in a single pancakeNsp = Number of single pancakes in a coil
NNsxNNsNxNNxNNxNNxN
NxNNxNNxNNxN
NxNNxNNxNNxN
NxNNxNNxNNxN
NxNNxNNxNNxN
NxNNxNNxNNxN
AJKL
HCDE
IBCD
JABC
KBAB
LCBA
Lturn
..............
.........................................................................................
.........................................................................................
..............
..............
..............
..............
..............
NsNsxABABsumKJKLsum
CBCDsumEDEFsum
ABABsumCBCDsum
KJKLsumCBCDsumABABsum
Ldb
22)(........................................)(
...............................................................................
........................................)()(
........................................)()(
)(....................)()(
7July 2001
Cad1 Cad2 CadN-1
Cax1
Ca-2
CaxN
Cax1
Cax2
CadN-1 Cad2 Cad1 CadN--2 CadN-1
1st Single Pancake 2nd Single Pancake 3rd Single Pancake
CaxN
1st Double Pancake
Cad1
Cad1 Cad2 CadN-1 CadN-1 Cad2 Cad1 CadN-1Cad1 CadN-2
a1 a1 a1 a1 a1 a1 bN a1
a2 a2 a2 a2 bN-1 bN-1 bN-1
aN
aN-1aN-1
b1 b1
b2
a1
b1 b1 b1
a1
a2
aN-1
b1
Coil Modeling
10July 2001
Transients under Normal Operation Condition
Chopper Modeling + Coil Transient Analysis and Protection
11July 2001
Inverter + Chopper Modeling + Coil Modeling
Basic ControlsHave been developed
Controls is a major task in order to guarantee optimum performance (for the several demonstration functions) and avoid negative power quality impact on the supply system
14July 2001
Integrated System: Performance / Site Sensitivity
SMES Close to Load Center
SMES Close to Generation
15July 2001
Observations
The performance of an integrated STATCOM + SMES, and its dynamic response to system oscillations can be well observed and accurately determined by proper modeling and simulation using adequate EMTP Type programs.
It has been observed that energy storage can enhance the performance of a STACOM and possibly reduce the MVA ratings requirements of the STACOM operating alone. This is an important finding for cost/ benefit analysis of FACTS / Power Quality devices. Also the combination of other FACTS / Power Electronics Devices should be investigated in order to increase performance and reduce cost.
It has been also verified that a Voltage Source Inverter / STATCOM provides a real power flow path for SMES and that the SMES Coil chopper-controller can be controlled independently of the STATCOM controller.
It was also observed that the location where the combined compensator is connected is important for improvement of the overall system dynamic performance. Although the use of a reactive power controller seems more effective in a load area, this simulation study shows that a STATCOM with real power capability can damp the power system oscillations more effectively, and therefore stabilize the system faster if the STATCOM -SMES controller is located near a generation area rather than a load area.
16July 2001
Conclusions
• The development and implementation models for the simulation of high power electronics devices and associated energy storage systems such as a Superconducting Magnetic Energy Storage (SMES) system (SMES Coil and DC-DC Chopper) have been performed. Additional studies and verifications are required for better validation of benchmarking models
• The models/simulations are intended to provide a basis for verifying performance and developing functional specifications for the power electronics devices and associated interfaces subsystems.
• Power electronics devices topologies, technologies, protection and control strategies will be discussed and evaluated for its optimum performance on a specific location.
• EMTP and Dynamic Stability programs are required for the proper modeling and simulation of a SMES system for utility application.
top related