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Transcript
MPID 265 – Reactive Power Capability • ESB GWM propose to change the reactive power requirements for conventional plant to have a single Mvar requirement in each direction (leading and lagging). 1 esb.ie MPID – Reactive Power Capability 450 400 350 300 250 MW 200 150 100 50 0 -200 Existing Requirements -100 0 100 MVAR Lead 200 300 400 Lag 450 400 350 300 250 MW 200 150 100 50 0 -200 Proposed Requirements -100 Lead 2 0 Lag 100 MVAR Existing Lead 200 300 400 Existing Lag esb.ie MPID 265 – Why Change? • The additional lagging reactive power currently required at lower active power outputs cannot be used by the TSO as only a single reactive power declaration can be entered in each Leading and Lagging direction. • This misalignment between Grid Code and market systems has in the past caused units, whilst being fully compliant, to incur GPI’s for reactive power based on the single declaration limit in EDIL. • To align the reactive power requirements for conventional generators with the requirements for both WFPS and Interconnectors. Both of these technologies currently have requirements in line with what is proposed. 3 esb.ie MPID 265 – Why Change? •This additional reactive power capability places additional costs on conventional generators: • a. Increased size and tapping range for Grid transformers • b. Increased generator costs due to higher than standard IEC generator voltages • c. Additional switchgear costs due to increased voltage withstand requirements • d. Increased tapping range for house transformers • The modification actually provides the TSO with more leading reactive power from units at low load i.e. a greater technical capability. This is particularly important when attempting to control high voltages on a lightly loaded transmission system. 4 esb.ie MPID 265 – Straightforward Change 5 esb.ie