VRT Study Update José Conto ERCOT System Planning.

VRT StudyUpdate

José ContoERCOT System Planning

2 Dynamic StudiesSystem Planning

May 2010

Voltage Ride-Through Boundaries For WTG

Ref.: ERCOT Op. Guides, Section 3.1.4.6.1


May 2010

Type I Type II Type III Type IV

NEG Micon NM720.7 MW

Vestas V47660 kW

GE 1.5 MW

Kennetech 33-MVS400kW

Mitsubishi MWT1000A

1 MW

Vestas V661.75 MW

Vestas V90 1.8 /3 MW

Siemens 2.3 MW

Bonus1.3 MW

Vestas V801.8 MW

Gamesa G80, G83 & G87

2.0 MW

Clipper C93 2.5 MW

Vestas V821.65 MW

Suzlon S88 2.1 MW

Mitsubishi MWT-92/952.4 MW

Vestas NM721.65 MW

Nordex N802.5 MW

1404 MW16.5 %

463 MW5.5 %

5042 MW59.3 %

1598 MW18.7 %

Wind Turbine Generator Types

* 2009 Fall case


May 2010

The VRT Study

Identify system reliability risks associated with existing wind plants that do not have full VRT capabilities.

– Phase I• Dynamic simulations utilizing existing ERCOT model data set (PSS®E

ver. 30)

– Phase II• Verify wind plant modeling and develop model improvements as

necessary• Collect modeling data directly from wind plant owners

– Phase III• Dynamic simulations utilizing updated models based on model

verification (PSS®E ver. 31)


May 2010

Phase II

• Wind plant modeling outcome – – Collection of actual field data needed for plant modeling of all the wind plants

in ERCOT– Methodology to develop a collector system equivalent

and wind turbine aggregation

Steady State test• Active and Reactive Power Loss of wind plant• Active and Reactive Power Exchange at POI

Short-Circuit test• Short-Circuit Current Levels at POI for 3-Phase Faults

Dynamic Response test• Electrical Power Output Response• Terminal Voltage Response• System Frequency and Voltage Response


May 2010

Phase III

Dynamic simulations utilizing updated models. HWHL and HWLL cases rerun.

Scenarios:

1. HWLL case w/no conventional generation in West Texas

2. HWHL case w/dynamic motor load modeled in West Texas

3. HWLL case w/no conventional generation and w/dynamic motor load modeled in West Texas

4. Investigation of the impact of wind generator terminal and/or POI voltage set point on VRT response

5. Investigation of problematic contingencies to develop potential solutions that ensure an operational margin

6. Application of the updated wind models to an ERCOT 2010 base case


May 2010

• Simulations for HWHL and HWLL cases completed.

• Simulations for scenarios 1,2 and 3 completed. Results are being finalized.

• Scenarios 4 and 5 are under investigation.

• Scenario 6 has not started.

• Final Report outline has been developed and certain sections are currently under documentation. Presentation scheduled for June ROS meeting.

Phase III Status


May 2010

• Currently, no small signal stability limit on West to North when no conventional generation is on-line in the West; thermal limits only

• Based on study with updated models, voltage stability limit has potential to bind before thermal limits with no conventional generation on-line

• The critical contingencies: double circuit with and without fault and line-to-ground fault with breaker failure.

• Reduction in output at any of the units west of the West-to-North interface eliminate the non-convergence problem.

• ERCOT Operations will implement this new conditional stability limit ASAP.

No Conventional Generation in West Texas – Stability Limit?


May 2010

• Far West interface composed of three 345 kV lines west of Morgan Creek substation.

• West-North interface flow kept at ~1976 MW.

• A stability limit is reached when the Far West interface flow is about 1300 MW (~ 1150 MW Far West wind output.)

• Thermal overload binding before reaching the stability limit.

• ERCOT PI data for the period 7/1/2009 to 5/1/2010 indicates that the highest flow on the interface into Morgan Creek was 1140 MW and that the W-N stability limit was constraining most of the time when high transfer into Morgan Creek was observed.

• A stability limit will not be implemented for the Far West.

Far West Texas – Stability Limit?


May 2010

José ContoSupervisor, Dynamic StudiesSystem PlanningElectric Reliability of Texas, [email protected]

VRT Study Update José Conto ERCOT System Planning.

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