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Planning the CREZ 345 kV System for Multi-contingencies. CREZ Technical Conference January 26, 2010 Bernie Pasternack AEP Service Corporation. The build out of the CREZ 345 kV system will have enormous impacts on the planning and operation of ERCOT’s bulk transmission system.

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Planning the crez 345 kv system for multi contingencies

Planning the CREZ 345 kV System for Multi-contingencies

CREZ Technical Conference

January 26, 2010

Bernie Pasternack

AEP Service Corporation


The build out of the CREZ 345 kV system will have enormous impacts on the planning and operation of ERCOT’s bulk transmission system.

The required level of reliability will be greater than past expectations.

Impact of system failures

Variability of transmission loading patterns


Agenda
Agenda impacts on the planning and operation of ERCOT’s bulk transmission system.

TPL-001-1 Overview

Performance Requirements

Raising the Bar for EHV

Other Notable Changes

Summary

3


Tpl 001 1 drafting team roster
TPL-001-1 impacts on the planning and operation of ERCOT’s bulk transmission system.Drafting Team Roster

  • Ron Mazur, Manitoba Hydro

  • Tom Mielnik, MidAmerican

  • Bernie Pasternack, AEP

  • Bob Pierce, Duke

  • Chifong Thomas, PG&E

  • Jim Useldinger, KCPL

  • Dana Walters, National Grid

  • Active observers

  • NERC Staff Coordinator – Ed Dobrowolski

  • John Odom, FRCC (Chair)

  • Bob Millard, RFC

  • Darrin Church, TVA

  • Bill Harm, PJM

  • Doug Hohlbaugh, FirstEnergy (Vice Chair)

  • Julius Horvath, Wind Energy TX

  • Bob Jones, Southern

  • Brian Keel, SRP


Project scope
Project Scope impacts on the planning and operation of ERCOT’s bulk transmission system.

Standards Involved

TPL-001-0.1 (NERC A, No Contingency)

TPL-002-0a (NERC B, Single Contingency)

TPL-003-0 (NERC C, Multiple Contingency)

TPL-004-0 (NERC D, Extreme Contingency)

TPL-005-0 (RRO Regional and Interregional Studies)

TPL-006-0.1 (RRO Data, Reports, as requested by NERC)

Applicable Entities Involved

Planning Authority (Planning Coordinator)

Transmission Planner

Regional Reliability Organization

NERC Website Project 2006-02

http://www.nerc.com/filez/standards/Assess-Transmission-Future-Needs.html


Project scope1
Project Scope impacts on the planning and operation of ERCOT’s bulk transmission system.

Create a new standard that:

Has clear, enforceable requirements

Is not a Least Common Denominator standard

Addresses the issues raised in the SAR and issues raised by FERC and others


Ferc order 693 inputs
FERC Order 693 Inputs impacts on the planning and operation of ERCOT’s bulk transmission system.

FERC is looking for a clearer Standard that “raises the bar” on reliability

Consider a full range of variables to identify critical system conditions

Ensure simulations replicate real-time expectations

Should not allow for firm load shedding or curtailment of firm transfers in response to single contingencies


Project status
Project Status impacts on the planning and operation of ERCOT’s bulk transmission system.

Draft 5 authorized by Standards Committee for 30 day pre-ballot pool period

January 20, 2010 through February 19, 2010

Plan to ballot in early Q1 2010

10 day ballot period

Need to achieve quorum (75% of Registered Ballot Body)

Approval requires 2/3 approval from ballot body

NERC Website Project 2006-02

http://www.nerc.com/filez/standards/Assess-Transmission-Future-Needs.html


Table 1 performance requirements
Table 1 impacts on the planning and operation of ERCOT’s bulk transmission system.Performance Requirements

P0: Normal System

P1: Single Contingency

P2: Single Contingency [higher impact]

P3: Generator + 1

P4: Stuck Breaker

P5: Protection System Failure

P6: Overlapping contingencies [Non-gens, Two P1 Events]

P7: Common Structure [2 circuits]

Planning Events

  • Simulate the removal of all elements that Protection Systems and other controls are expected to automatically disconnect for each event.

  • Require Corrective Action Plans for inability to meet performance requirements


Table 1 performance requirements1
Table 1 impacts on the planning and operation of ERCOT’s bulk transmission system.Performance Requirements

Category (P0, P1, … P7)

Initial system condition

Event

Fault Type (3-phase or Single Line to Ground)

BES Level (EHV or HV)

Interruption of Firm Transmission Service Allowed

Non-Consequential Load Loss Allowed

Planning Events, Table Components (Columns)

Consequential Load Loss:All Load that is no longer served by the Transmission System as a result of Transmission Facilities being removed from service by a Protection System operation designed to isolate the fault.

Non-Consequential Load Loss: Non-Interruptible Load loss that does not include: (1) Consequential Load Loss, (2) the response of voltage sensitive Load, or (3) Load that is disconnected from the System by end-user equipment.


Table 1 performance requirements2
Table 1 – Performance Requirements impacts on the planning and operation of ERCOT’s bulk transmission system.

If the event analyzed involves BES elements at multiple System voltage levels, the lowest System voltage level for stated performance criteria applies regarding allowances for interruptions of Firm Transmission Service and loss of Non-Consequential Load

Planning Events, Table


Tpl 001 1 ehv performance
TPL-001-1 impacts on the planning and operation of ERCOT’s bulk transmission system.EHV Performance

Areas where “bar was raised” for EHV

Single contingency (P2-2 & P2-3)

Stuck Breaker (P4)

Protection System Failure (P5)


Raising the ehv bar
Raising the EHV Bar impacts on the planning and operation of ERCOT’s bulk transmission system.

WHY ?

EHV is the backbone of the transmission system; it must be the strongest link

EHV failures lead to major blackouts

Even if probability is low, impact is high

13


Aep s perspective
AEP’s Perspective impacts on the planning and operation of ERCOT’s bulk transmission system.

Eastern AEP (PJM) EHV system planned to a higher standard

Contingencies are surrogates

Normal ratings for single contingencies

N-2 instead of N-1-1

Superimpose heavy transfers

Multiple generators plus single or dbl circuit lines

Result is a robust system with flexibility to accommodate unforeseen conditions

14


Tpl 001 1 other relevant changes
TPL-001-1 impacts on the planning and operation of ERCOT’s bulk transmission system.Other Relevant Changes

Near term Off-peak steady state and stability studies specifically required

Specific consideration of spare equipment strategy

Explicit requirement to do near term short circuit analysis, meet performance requirements, and define corrective actions

Specific requirement to assess proposed generation in long term horizon

Requires consideration of outages and performance deficiencies on neighbors’ systems


Tpl 001 1 contingency analysis clarity
TPL-001-1 impacts on the planning and operation of ERCOT’s bulk transmission system.Contingency Analysis Clarity

Simulate removal of all elements that Protection and other automatic controls are expected to disconnect

Consider impact of successful or unsuccessful high speed reclosing

High speed reclosing is closing within one second

Generator low voltage ride through

Trip unit in simulation if voltage is less than ride through voltage limitations

Ride-through can be known or assumed

16


Summary
Summary impacts on the planning and operation of ERCOT’s bulk transmission system.

Build out of the CREZ 345 kV system will require a higher level of reliability

New TPL Standard raises the bar, particularly for EHV

FERC is a driver

Must protect the backbone of the grid

17


Summary1
Summary impacts on the planning and operation of ERCOT’s bulk transmission system.

Simulation of contingencies must replicate actions of Protection Systems and controls

New TPL standard will produce a more robust and flexible system

18


Questions ? impacts on the planning and operation of ERCOT’s bulk transmission system.


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