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CIM for Planning and CIM for Dynamic Models - Project Report. Terry Saxton Xtensible Solutions tsaxton@xtensible.net. CIM User Group Vasteras, Sweden June 13, 2008. EPRI CIM Planning Project. EPRI initiated project in October 2006 Funded by ten utilities and multiple vendors Objectives

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cim for planning and cim for dynamic models project report

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 planning project
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
needs addressed
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
use cases p p
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

use cases o p
Use Cases: O-P

Planning

Planning

Operations

use cases operations to planning
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
use cases p o
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

profiles and interfaces
Profiles and Interfaces

Planning

Planning

NMMR

Historian

  • NMMR
  • Project Repository
  • As-build Network Model
  • Historical Data

Operations

accomplishments and benefits
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
accomplishments and benefits10
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
cim extensions new classes
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
cim extensions new classes cont d
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
new attributes
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
cim for dynamic models
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
business needs
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
business needs cont d
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
types of dynamic model exchanges
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
project teams created
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
project work accomplished
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
requirements for standard models
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
associating dynamic models to static load flow model

CNG

DynamicModels

SynchronousMachine

f

PSS

V, θ

Generator

Ireal, Iimag

GeneratingUnit

Exciter

Associating Dynamic Models to Static Load Flow Model
  • UML modeling requirements captured
connectivity modeling between control blocks

PowerSystemResource

Control Block

1

1

*

*

Block Input

Block Output

1

0..1

*

Signal

0..1

*

0..1

Measurement

Connectivity Modeling Between Control Blocks
  • Proposal for CIM modeling approach
key artifacts to be produced
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