energy - generation

Genstar4 Power Scheduler

The Power Scheduler Manager covers the activities for availability and production scheduling, and to support the associated data exchange requirements of the National Grid via EDT.

The Power Scheduler module supports the following activities:

  • Calculating maximum unit availability.
  • Providing mandatory data to the System Operator or National Grid via EDT.
  • Managing availability adjustment factors.
  • Calculating the operating schedule.
  • Notifying the SO of intended physical position.
  • Managing Control System data.

Recording unit outages

  • Outages can be recorded for the planned maintenance program, Force Majeure etc, and retrospectively for unplanned events such as equipment trips.
  • Outages are recorded at the generating unit level (GTs and ST, in the case of a CCGT), and allow the operator to specify either a complete outage (zero capacity) or partial reduction of capacity.

Recording weather forecasts

  • Weather forecasts can be recorded for configurable variables such as temperature, pressure, humidity.
  • The option is provided for these forecasts to be used to scale the short-term technical-availability profile (on which the maximum export limit can be based) by means of look-up adjustment factors. Forecast data provided by a weather forecasting service can be automatically loaded or the data can be recorded manually.

Generating Outage and Availability forecasts

  • Outage and availability forecasts can be created for provision to the SO for network planning. The forecasts can be generated for the duration and timescales required by the SO.
  • Recorded turbine outages are used to reduce the corresponding capacity from the net generating unit availability.
  • The forecasts can be submitted to the SO in the required file format including EDT for National Grid.

Compiling the Maximum Unit Availability

  • The generating unit Availability profile is the basis for compiling the maximum output available to export (maximum export limit).
  • The unit generating capacity is reduced by recorded generating unit outages and, optionally, the forecast weather values to create a profile of half-hourly availability up to five days ahead. The system then calculates a shaped maximum export limit profile using the unit ramp rates.
  • Alternatively, the user can compile the profile manually, or copy and edit an existing dataset.

Calculating the operating schedule

  • In the UK, market participants are required to submit the unit operating schedule to the National Grid. In other markets where the schedules are determined centrally by the SO, the market participant will need to store and display each unit schedule to validate that it is achievable.
  • The operating schedule is compiled for up to 5 days ahead. Genstar4 provides several options for the compilation:
    • generated from the maximum export limit.
    • compiled manually or cloned from an existing dataset.
    • imported from a .CSV file.

EDT - Submitting planning and operational data to the System Operator

  • Planning and Operational Data for each generating unit can be compiled for submission to the National Grid via EDT. The data can also be loaded from externally created files.
  • The data requirements will be specific to the market but generally include minimum/maximum export/import limits, as well as ramp rates, minimum on and off times and notices to deliver. The submission interface provides sequencing, validation and receipt of acknowledgements (ACK/NACK).
  • Submission can be made from either the original screens where the data was compiled or from a rapid submission facility where all pending data is managed.

Managing Station Control data

  • Control system and measurement data for the station and each generating unit is imported and displayed for the user to maintain, if necessary. The data collated is specified according to requirements, but can typically include fuel usage data, ambient weather variables and any data required by contract calculations.

Genstar4 also provides full support for dispatching power stations via EDL. For more information Contact Dunstan Thomas.

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