Upload
others
View
6
Download
0
Embed Size (px)
Citation preview
©2008 www.sandc.com©2008 www.sandc.com
Application of InverterApplication of Inverter--Based Systems for Peak Based Systems for Peak Shaving and Reactive Power ManagementShaving and Reactive Power Management
Ken Ken MatternMattern, S&C Electric, S&C ElectricAbraham Ellis, Public Service of New MexicoAbraham Ellis, Public Service of New Mexico
Ali Ali NouraiNourai, AEP , AEP Steven E. Williams, S&C ElectricSteven E. Williams, S&C ElectricCharles Edwards, S&C ElectricCharles Edwards, S&C Electric
Dave Porter, S&C ElectricDave Porter, S&C Electric
Case studies Case studies –– InverterInverter--based Applicationsbased Applications•• Distributed Energy Storage SystemDistributed Energy Storage System
–– AEP systemAEP system–– Peak shavingPeak shaving–– NaSNaS batteriesbatteries
•• Reactive Power Compensation for Wind Power PlantReactive Power Compensation for Wind Power Plant–– 90 MW WPP on PNM system90 MW WPP on PNM system–– Zero reactive power exchange at POIZero reactive power exchange at POI
DESSDESS
•• DDistributed istributed EEnergy nergy SStorage torage SSystem ystem •• AEP Charleston Energy Storage ProjectAEP Charleston Energy Storage Project•• SodiumSodium--Sulfur (Sulfur (NaSNaS) batteries ) batteries –– NGKNGK
–– 1.0 MW with 1.2 MW short time rating, 7.2 1.0 MW with 1.2 MW short time rating, 7.2 MWhMWh–– 300300ººC to 360C to 360ººC operating temperatureC operating temperature–– Vacuum enclosedVacuum enclosed–– 20 x 50 kW modules20 x 50 kW modules–– 2500 to 4000 cycles, 15 year life2500 to 4000 cycles, 15 year life
•• 1212--kV feeder, peak shave an overloaded substation kV feeder, peak shave an overloaded substation transformer to defer upgrade to larger substationtransformer to defer upgrade to larger substation
Simplified DESS Power CircuitSimplified DESS Power Circuit
Load and DESS Power ProfileLoad and DESS Power Profile
+ 1.2 MW Charge
- 1.0 MW Discharge
+ 1.2 MW Charge
- 1.0 MW Discharge
Example Profile from First Day of OperationExample Profile from First Day of Operation
Predefined ProfilesPredefined Profiles
DESS InstallationDESS Installation
Current DESS ActivityCurrent DESS Activity•• Direct control of real and reactive power with local Direct control of real and reactive power with local
override based upon frequency and voltageoverride based upon frequency and voltage•• Distribution feeder support in coordination with S&C Distribution feeder support in coordination with S&C
IntelliTeamIntelliTeam systemsystem•• Operation with wind generatorsOperation with wind generators•• 1 MW in service1 MW in service•• 5 MW in process5 MW in process•• Expect a total of 9 MW in 2008Expect a total of 9 MW in 2008•• 1 1 –– 5 MW unit sizes with larger systems in discussion5 MW unit sizes with larger systems in discussion
Dynamic CompensatorDynamic Compensator
•• DDistributed istributed STATSTATicic COMCOMpensatorpensator (DSTATCOM)(DSTATCOM)•• 90 MW 90 MW WindfarmWindfarm on PNM system, Type 1 wind on PNM system, Type 1 wind
generatorsgenerators•• Voltage stability limited 345 kV transmission with Voltage stability limited 345 kV transmission with
200 MW HVDC and 204 MW WPP200 MW HVDC and 204 MW WPP•• No reactive power exchange at the POINo reactive power exchange at the POI•• ±± 12 12 MVArMVAr DSTATCOM, 4 x 34.5DSTATCOM, 4 x 34.5--kV Capacitor banks kV Capacitor banks
total 91 total 91 MVArMVAr•• Short time rating of 3.3 per unitShort time rating of 3.3 per unit
OneOne--Line Diagram of Compensation SystemLine Diagram of Compensation System
WPP MW, Inverter WPP MW, Inverter VArsVArs and Net and Net VArsVArs at POIat POI
-20
0
20
40
60
80
100
0 1 2 3 4 5 6 7 8 9 10 11
MW
, MV
AR
Hours
Inverter MVArWPP Net MVAr
WPP MW
Wind Power Plant Collector VoltageWind Power Plant Collector Voltage
0.95
0.96
0.97
0.98
0.99
1
1.01
1.02
1.03
1.04
1.05
0 1 2 3 4 5 6 7 8 9 10 11
Volta
ge, p
u
Hours
Vdr puVdr pu
Capacitor StatesCapacitor States
1
2
3
4
0 1 2 3 4 5 6 7 8 9 10 11
Cap
Ban
k S
tate
Hours
13 MVAR #4
26 MVAR #3
26 MVAR #2
26 MVAR #1
Dynamic Compensator InstallationDynamic Compensator Installation
Questions?