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IMO Transmission Assessment Criteria Bonnie Rose IMO 5/23/2017 Market Operations Standing Committee of the IMO 1 Transmission Assessment Criteria • Identifies the technical criteria the IMO uses for: – Connection Assessments – Assessment of the adequacy of existing and planned transmission facilities to meet the current and future electricity needs of Ontario 5/23/2017 Market Operations Standing Committee of the IMO 2 Contents Study Guidelines: • Study Period • Base Case • Load • Power transfer capability • Contingency Based Assessment • Study Conditions 5/23/2017 Market Operations Standing Committee of the IMO 3 Contingency Based Assessment • IMO identifies Bulk Power System – IMO assumes no facilities are bulk – Apply NPCC contingencies throughout the ICG and examine results – The bulk power system is that portion of the ICG that can have a significant adverse impact outside the local area • Apply NPCC design criteria contingencies 5/23/2017 Market Operations Standing Committee of the IMO 4 Contingency Based Assessment • Local Areas – “Local areas” are those portions of the ICG where the consequence of faults or disturbances is well understood and restricted to a clearly defined set of facilities on the ICG. – Apply single element contingencies 5/23/2017 Market Operations Standing Committee of the IMO 5 Contingency Based Assessment • The IMO will apply bulk power system design criteria contingencies to local areas in cases when: – voltage problems propagate to higher voltage levels – the net load impacted exceeds 1,000 MW 5/23/2017 Market Operations Standing Committee of the IMO 6 Contents System Conditions: • Generation Dispatch – to stress the system • Exports and Imports – to stress the system • Stability Conditions – 10% margin on most critical parameter 5/23/2017 Market Operations Standing Committee of the IMO 7 Contents System Conditions: • Permissible Control Actions, following a contingency, to respect loading, voltage, and stability limit requirements – Generation redispatch – Automatic tripping of generation (G/R) – Connectivity changes to change flow – Trip or redispatch dispatchable load – Switch reactors/capacitors 5/23/2017 Market Operations Standing Committee of the IMO 8 Contents System Conditions: • SPS – G/R post single contingency = need for reinforcements 5/23/2017 Market Operations Standing Committee of the IMO 9 Contents Pre and Post System Conditions: • Identifies acceptable pre and post contingency response on the ICG 5/23/2017 Market Operations Standing Committee of the IMO 10 Pre and Post Contingency System Conditions • Power Transfer Capability – Congestion allowed – Not allowed to lower power transfer capability • Pre-Contingency Voltage Limits – Transmission System Code 5/23/2017 Market Operations Standing Committee of the IMO 11 Pre and Post Contingency System Conditions • Voltage Change Limits – Based on historical planning criteria – 10% following contingencies – 4% following reactive or capacitive switching • Transient Voltage Criteria – New – Based on CMP and WSCC criteria 5/23/2017 Market Operations Standing Committee of the IMO 12 Pre and Post Contingency System Conditions • Steady State Voltage Stability – PV curves (10% margin on Power) – Damping factor • Identify Congestion • Line and equipment loading – Equipment owner’s rating – Transmission line at 4km/hr, 0°/30° • Short Circuit Levels 5/23/2017 Market Operations Standing Committee of the IMO 13 Contents Transmission Connection: • New or Modified Facilities – Predominantly section 1.6 from MM2.10 • Effect on Existing Facilities – Predominantly section 1.6 from MM2.10 5/23/2017 Market Operations Standing Committee of the IMO 14 Contents Generation Connection: • Voltage Change – Additional criteria - 5% on generator switching • Wind Power – Start-up – Peaking units for transmission assessment – Transmission line rating at 15km/hr within 50km radius 5/23/2017 Market Operations Standing Committee of the IMO 15 Generation Connection • Transmission Facilities – Generating station >500MW requires double circuit + breaker &1/3 or breaker &1/2 network station layout 5/23/2017 Market Operations Standing Committee of the IMO 16 Contents Station Layout: • Provides guidelines for desirable station layouts for switching and transformer stations – Acceptability ultimately driven by design contingencies and their impact on the ICG 5/23/2017 Market Operations Standing Committee of the IMO 17 Stakeholder Input • What’s Next? – Stakeholder this document at the Forecasts and Assessment Sub Committee 5/23/2017 Market Operations Standing Committee of the IMO 18