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Proposed MOD-B Standard for Transmission Data Requirements in Power Flow and Transient Stability

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The proposed MOD-B Standard aims to streamline data requirements for power flow (PF) and transient stability (TS) studies by consolidating existing MOD standards (MOD-010 through MOD-015) into a single modeling standard. The standard emphasizes the need for accurate steady-state, dynamics, and short-circuit data provided by Planning Coordinators and Transmission Planners. Key requirements focus on data sufficiency, usability, consistency, and accuracy. The initiative seeks to accommodate interconnection specifics in model creation while making sure entities meet defined data submission guidelines.

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Proposed MOD-B Standard for Transmission Data Requirements in Power Flow and Transient Stability

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  1. Sequence Data, Power Flow & Transient Stability (PF & TS) MSRATF - July 10, 2013 Joe Seabrook

  2. NERC MOD-B Development (May 9, 2013) • http://www.nerc.com/pa/Stand/Pages/MODBInformalDevelopmentProjectRF.aspx

  3. MOD-B Proposed Approach (May 9, 2013) Proposed single modeling standard to combine and replace MOD-010 through MOD-015 • Requirement R1: provide steady-state, dynamics, and short circuit data to Planning Coordinator(s) and Transmission Planner(s) according to the data requirements specified in Attachment 1 and other criteria. • Attachment 1: Specifies a three column detailed matrix of data requirements for steady-state, dynamics, and short-circuit data

  4. MOD-B Proposed Approach (May 9, 2013) Proposed single standard (R2): • Requirement R2: Provides a requirement for entities that submit data to provide correct data • Covers data sufficiency, usability, consistency, and accuracy • Tool for PC or TP in collecting data • Does not obligate a process to check/confirm data • Uses format similar to MOD-26-1 requirements (see, e.g., MOD-26-1, Requirement R3)

  5. MOD-B Proposed Approach (May 9, 2013) Proposed single standard (R3): • Requirement R3: To facilitate creation of interconnection-specific models, a requirement for Planning Coordinator to submit data collected under Requirement R1 according to a (proposed) NERC list of modeling organizations (which are the organizations that currently exist) • Intended to create clear expectation that each Planning Coordinator will provide the data they collect under Requirement R1 according to an interconnection-specific process • Recognizes the differences among interconnections in model building process, but creates obligation for PC to provide the data in a manner that accounts for those differences. • Replaces MOD-014 and MOD-015

  6. MOD-B Attachment 1 (June 17, 2013 conference)

  7. MOD-B Attachment 1 (June 17, 2013 conference) • Positive Sequence Data – provide for all applicable elements in column “steady-state” • Negative Sequence Data – provide for all applicable elements in column “steady-state” • Zero Sequence Data – provide for all applicable elements in column “steady-state” Bus, Generator, Transmission line, Transformer (include connection type) • Mutual Line Impedance data Resistance, Reactance, Mutual Coupling Locations

  8. Sequence Data in Transient Stability • WECC TSS/MSRATF - Represent the response of simulation programs to fault conditions through Relay and RAS models • TS fault simulation historically has been through pre-determined fault impedances and expected relay response. • Relay and RAS models will require fault detection and appropriate clearing • Will include all NERC standard faults (3Φ and 1Φ)

  9. Sequence Data in Transient Stability • Negative and Zero sequence data is network data; R, X, B, connections • Machine models are + Sequence • Include features to approximate – and 0 sequence, like gen braking, or 1Φ motors • Simulation programs use sequence data to calculate fault currents in PF • Fault currents needed in TS

  10. Sequence Data in Transient Stability • In TS, the + sequence network is solved each time step. • For Unbalanced Faults require • Negative and zero sequence currents at each time step • TS models of relays that trip breakers on negative and zero sequence currents • Common example: Directional zero sequence inverse time over-current relay – used for 1Φ faults

  11. Sequence Data in Transient Stability • Simulation Programs would solve negative and zero sequence networks at each time step • Would provide access to sequence currents and voltages for relay actions • Would provide decaying fault currents from TS generator models and inverse time over-current relay responses

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