IEEE T&D FACTS Panel Session Part II (08TD0140) Wednesday, April 23, 2008
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1 IEEE T&D FACTS Panel Session Part II (08TD0140) Wednesday, April 23, 2008 Improving Power System Dynamic Performance in Laredo, TX Prepared by Paul Hassink (AEP) Paul Marken (GE) Rob O Keefe (AEP) Gerardo R. Trevino (AEP) Prepared for NATD June Montreal Laredo, Texas and surrounding area Roughly 450 MW load peak in 2006 Served by four long 138 kv lines High load growth, up to 5% annually Requires local generation at 350 MW Non-economic local generation (under RMR) up to 179 MW 1
2 South Texas Transmission System Laredo area Texas (ERCOT) Mexico (CFE) Prepared for NATD June Montreal Justification for the Laredo VFT Laredo Plant units contracted for RMR service due to voltage collapse potential at load level of 350 MW. In 2007, with the largest generating unit unavailable and remaining units (70 MW) operating, voltage collapse is probable at a load level of 450 MW. By 2010, a new 345 kv line will be completed in order to remove the need for RMR generation. Variable Frequency Transformer (VFT) asynchronous tie was found to maintain stability in 2007 through 2010 and augment capacity of the new 345 kv line, deferring the need for the next line. 2
3 Application of ERCOT Planning Criteria VOLTAGE COLLAPSE WITH 150 MW CFE TIE AND 345 kv LINE VOLTAGE COLLAPSE WITH 345 kv LINE VOLTAGE COLLAPSE WITH 150 MW CFE TIE TRANSACTION LAREDO 1 & 2 ON-LINE VOLTAGE COLLAPSE WITH LAREDO 1 & 2 ON-LINE LAREDO 3 OFF-LINE LAREDO AREA PEAK DEMAND PROJECTION OPERATING LIMITS INCLUDE 5% MARGIN VOLTAGE COLLAPSE LIMIT WITHOUT GENERATION Imports Required to Sustain Transient Stability Transient Stabilty Limits Asynch. Device MW Injection Laredo Load in MW VFT VSC BTB HV DC BTB VFT VSC BTB HV DC BTB 3
4 What is a VFT? The Variable Frequency Transformer (VFT) is a bidirectional transmission device that can transfer power between asynchronous or synchronous networks. The VFT is a rotating phase-angle regulator with continuous controllability enabling power transfer from one grid to another from 0 to 100 MW. VFT Asynchronous Operation 60 Hz N 1 u SB + I SB + U I RB RB ~ + u RC I RC I SA I RA + u RA + u SA u α 1,2 α 1,2 61 Hz N 2 u SC + I SC Any frequency difference is accommodated by rotation of the rotor 4 pole machine => 1Hz = 30 rpm Up to 3 Hz difference 4
5 Laredo VFT Installation 100 MW tie connecting the U.S. and Mexico Formal AEP bid processes April 04 Laredo project awarded to GE March 05 GE breaks ground at Laredo site Nov 05 Rotating machine installation 2H06 Commence commissioning\testing 1Q07 Commercial Operation May 18, 2007 GE Proprietary Laredo Application of VFT Voltage depression resulting from a fault on any of the four 138 kv lines supporting Laredo increases slip on induction load such as air conditioning, causing reactive power consumption to escalate. Without relief from reactive power demand, under voltage load shed (UVLS) is necessary for recovery. VFT provides: Injection of real power, offsetting power flow on heavily loaded 138 kv lines that consume reactive power Injection of reactive power providing voltage support in Laredo This transient response, which is passive, offsets the need for active power imports and reduces the need to operate RMR generation. 5
6 Voltage Response to Disturbance in Laredo V Voltage at the source, north of Laredo UVLS in the Laredo Area Real and Reactive Power Response of VFT to Disturbance VFT P Flow MW MVAR VFT Q Flow Time (seconds) Fig. 1. Injection of Real Power through VFT during and immediately after a fault Time (seconds) Fig. 2. Injection of Reactive Power through VFT during and immediately after a fault. 6
7 Voltage at VFT Terminals through Disturbance 1.10 V - Laredo 17 kv 1.00 V - CFE 230 kv Per Unit Voltage Time (seconds) Nuevo Laredo / Laredo Rio Escondido Asherton Tamauulipas Texas Dilley Sw. St. Nuevo Laredo Area 3/ Laredo Nuevo Asynchronous Laredo/Laredo Interconnection Area between CFE and ERCOT HVDC Tie Locations North Laredo Under Construction San Miguel Freer Fault Location County Line Future Substation OR 400 Generation Anahuac Double Circuit Capable Arroyo Del Coyote CD INDUSTRIAL Laredo PP Campestre Falcon NUEVO Laredo Wormser Falcon Highway 59 Falfurrias On July 16/2007, the Laredo VFT to Falfurrias 138kV line tripped due to a Phase C to Ground fault approximately 8.07 miles from VFT 7
8 Actual VFT fault response Fig. 3. Real power through the VFT during an actual 138kV transmission line fault. Fig. 4. Reactive power through the VFT during an actual 138kV transmission line fault. On July 16, 2007, two months after the VFT entered commercial operation, a fault occurred on one of the ERCOT 138kV transmission lines terminating at the VFT. The event was a temporary phase to ground fault 8 miles away from the VFT. The fault was cleared in 4 cycles by the breakers protecting the faulted line and the line was successfully reclosed in about 18 cycles. The demonstrated performance of the VFT matches earlier simulations. VFT is a Comprehensive Solution Passive response to post-fault disturbance can produce a 200% real power injection Supplies reactive power during and after faults Provides complementary support to RMR Generation, existing STATCOM and 345 kv line 8
9 South Texas Transmission System Texas (ERCOT) San Antonio to Laredo 345 kv line to be completed 1Q2008 Mexico (CFE) VFT compatibility with future enhancements MW MVAR Time (seconds) Fig. 5. Real power through the VFT with loss of 345kV line and future load levels Time (seconds) Fig. 6. Reactive power through the VFT with loss of 345kV line and future load levels. While the benefits provided by the addition of this line are substantial, an unfortunate side affect is that with this improvement alone to the Laredo area system, the 345 kv lines become the greatest liability for dynamic stability. Because the majority of power flowing into Laredo is diverted to the 345 kv line, the event of its outage becomes the worst contingency for that area. Real and reactive power injection across the VFT offsets the interrupted flows of the 345 kv line. 9
10 Conclusions The VFT has a natural beneficial stabilizing characteristic. The VFT s passive response in the transient time frame plays an important role in maintaining acceptable post-fault dynamic performance in the Laredo area. Actual experience has confirmed predictions of the simulation model. 10
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