CIM for Planning andCIM for Dynamic Models

- Project Report

Terry Saxton

Xtensible Solutions

tsaxton@xtensible.net

CIM User GroupVasteras, Sweden

June 13, 2008

EPRI CIM for Planning andDynamic Models Project

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EPRI CIM Planning Project

EPRI initiated project in October 2006 Funded by ten utilities and multiple vendors Objectives

– Develop a common power system network model that both operations and planning groups can use as a basis for information exchange

– Provide the possibility of entering network model data once for both planning and operations applications

EPRI CIM for Planning andDynamic Models Project

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Needs Addressed

Improve reliability of transmission grid– Strengthen planning efforts based on actual network contingencies

and base conditions– Enable planning studies to be based on actual physical network

with all current field changes incorporated How?

– Enable the management and maintenance of a single, common network model for use by both planning and operations

– Enable the sharing of steady state, short circuit, and dynamic models

Technical Approach– Extend the IEC 61968/70 Common Information Model (CIM)

Standard– Started with defining high priority use cases

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Use Cases: P-P

Export a static network model from one planning software program to another to transfer a planning base case for additional study by another party

– Steady State model (completed)– Short Circuit model (partially completed)– Dynamic data models (preliminary investigation begun)

Cases may be transferred either within one organization, or between two separate organizations (i.e. RTO – utility)

Planning Planning

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Use Cases: O-P

Planning Planning

Operations

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Use Cases – Operations to Planning

Import a state estimator or load flow case from the Energy Management System into the planning environment

– To establish a planning base case for additional study or for developing a current planning model

Export Contingency Specifications from the EMS or another application for use by the planning application(s)

– This would allow coordination between the contingencies used by operations and transmission planning as well as generation planning

Convert the contingency low side load rollover used in the EMS application(s) to the contingency load rollover used in the planning application(s)

– Allows coordination between the contingencies used by operations and transmission planning as well as generation planning

Export Load Forecast data from the EMS or another application for use by the planning application(s)

– This will provide correct conversion between the models used by operations and transmission planning as well as generation planning

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Use Cases: P-O

Export detailed dynamic model data to EMS (e.g., voltage stability analysis) for real-time dynamic assessment analysis

Planning Planning

Operations

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Profiles and Interfaces

Planning Planning

HistorianNMMR

OperationsNMMR1. Project Repository2. As-build Network Model3. Historical Data

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Accomplishments and Benefits

Brought key suppliers of planning applications and EMS together with utilities to achieve stated objectives

– Two workshops conducted – Task Forces prepared use cases for the information exchange

between planning and operations and a central network model manager

Achieved agreements on CIM representation of steady state and short circuit models for exchange

– Most reuse of existing CIM classes with some new extensions– Conducted multiple conference calls to resolve issues identified by

project members– Collaborated closely with current RTO/ISO/utility projects with

similar goals

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Accomplishments and Benefits

Extended CIM to support the new integration frameworks that incorporate a centralized network model repository and manager

– Makes possible single entry of network model changes for use in both planning and operations environments

– Enables sharing of models between planning and operations– Enables standard interfaces based on CIM/XML/RDF– Directly supports current ERCOT efforts and stated goals of other

RTO/ISOs and member utilities Defined new profiles for CIM Planning information exchange Interoperability tests are planned Proposed CIM extensions and issue resolutions submitted to

IEC

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CIM Extensions – New Classes

Contains 10 new Classes in the newPlanning Package:

BranchGroup BranchGroupTerminal CorrectionValue Loss Factor Mutual Coupling Ownership Planning Area PlanningZone PlanningZoneGroup WindingImpedanceCorrection

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CIM Extensions – New Classes (Cont’d)

Contains 1 new Class in the Topology Package:

ConnectivityNodeGroup

Contains 1 new Planning Class in the Wires Package:

SwitchedShunt

Contains 1 New Planning Class in the Meas Package:

EquipmentRating

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New Attributes

Each new class from the Planning Package contains one or more attributes

Added new attributes to Existing Classes:– ShuntCompensator– EnergyConsumer– PowerSystemResource– GeneratingUnit– TransformerWinding– SynchronousMachine

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CIM for Dynamic Models

New EPRI project – started March 2008 Project Objectives

– Develop a common model and set of interface profiles based on the CIM that supports the exchange of dynamic models and data between

different planning applications and equipment suppliers planning applications and operations

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Business Needs

Conduct dynamic assessment studies– Contingency analysis– Evaluation of conditions leading up to a catastrophic event– Determine where network upgrades are needed

Studies involve simulations which require dynamic models of generators, loads, other network devices

– Models far more detailed than those used for load flow studies

– Dynamic models becoming more complex with multiple variations

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Business Needs (cont’d)

New plant commissioning– Operating utility must round up various dynamic

models in various formats (e.g., PSLF or PSSE)– New equipment requires new models from

supplier May entail research from equipment manuals Followed by manual tweaking for custom changes

Multiple sources of data from different systems needed for dynamic models– Ex: Transformer test reports stored in Asset

Management system

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Types of Dynamic Model Exchanges

Standard models– Several approved lists (IEEE, WECC, RFC)– Include multiple models for following categories:

Generators (including wind turbines) Motors Excitation systems, limiters, and compensators Turbine/govenor models Stabilizers Loads Transmission devices Relay and protection devices HVDC

User-Defined models– Decomposed blocks for user-written models with parameters

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Project Teams Created

Three project teams were created to accomplish the majority of the work on the project– Standard Model Team: Lead - Bill Price

– User-Defined Model Team: Lead - Chuck Dubose

– CIM Modeling Team: Lead – Kendall Demaree

Other project members not in attendance are invited to join a team

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Project Work Accomplished

First cut made at requirements for dynamic model exchange– Will lead to compilation of data elements for

exchange profile Draw heavily on existing PSSE and PSLF file formats

currently in use New project participant DigSilent has additional file

format to consider

– New inputs from UCTE and Eurostag– Next step is mapping to CIM

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Requirements for Standard Models

Name of model Associated bus number and unit ID in static network model (bus name and kV

optional) MVA base (or MW capability) value System parameter values. For example for generators:

– D-axis transient rotor time constant – Q-axis transient rotor time constant – Inertia constant, sec – Damping factor, pu – D-axis synchronous reactance – Q-axis synchronous reactance – D-axis transient reactance – Q-axis transient reactance – Stator leakage reactance, pu – Saturation factor at 1 pu flux – Saturation factor at 1.2 pu flux – Stator resistance, pu – Compounding resistance for voltage control, pu – Compounding reactance for voltage control, pu

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Associating Dynamic Models to Static Load Flow Model

UML modeling requirements captured

Synchronous

Machine

Generating Unit

CNG

Exciter

Generator

PSS

Dynamic Models

V, θ

Ireal, Iimag

f

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Connectivity Modeling Between Control Blocks

Proposal for CIM modeling approach

Control Block

Block Output

Signal

Block Input

Measurement

PowerSystemResource

1 1

* *

0..11

0..1

*

* 0..1

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Key Artifacts to be Produced

Proposed extensions to CIM UML information model Proposed modeling approach to handle dynamic

models New exchange profiles for the various exchanges

between planning applications, operations advanced applications, asset management, and equipment manufacturers

Standard definition for base cases from operations Template for equipment suppliers to provide dynamic

models

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