Real-world Examples of Prioritized Load Shedding

In system design, prioritized load shedding is implemented using various techniques and strategies to ensure the reliability and stability of electric power systems. Here are some real-world examples specifically focused on system design:

• Distribution Management Systems (DMS):
  • Advanced DMS software is used by utilities to monitor, control, and optimize distribution grids.
  • These systems incorporate prioritized load shedding algorithms that dynamically adjust load shedding strategies based on real-time grid conditions, such as voltage levels, equipment status, and demand forecasts.
  • For example, the DMS deployed by Southern California Edison includes load shedding capabilities to maintain grid stability during peak demand periods or equipment failures.
• Microgrid Control Systems:
  • Microgrids are localized energy systems that can operate independently or in parallel with the main grid. Microgrid control systems employ prioritized load shedding to manage generation and demand within the microgrid during islanded operation or grid-connected mode.
  • Critical loads within the microgrid, such as hospitals or emergency shelters, are prioritized to ensure uninterrupted power supply, while non-critical loads may be shed to conserve energy resources.
• Integrated Energy Management Systems (EMS):
  • EMS platforms integrate various components of the electricity system, including generation, transmission, distribution, and demand-side resources.
  • These systems incorporate prioritized load shedding functionalities to optimize grid operations and maintain reliability.
  • For instance, the EMS deployed by National Grid in the United Kingdom includes load shedding capabilities to manage voltage stability and congestion on the transmission grid.
• Emergency Response Plans:
  • Utilities and grid operators develop comprehensive emergency response plans that outline procedures for prioritized load shedding during crisis situations, such as natural disasters or extreme weather events.
  • These plans include predefined priority lists for critical loads, communication protocols with customers and stakeholders, and coordination with emergency services. For example, the emergency response plan implemented by PG&E in California includes load shedding protocols to maintain grid stability during wildfire events.

Prioritized Load Shedding involves designing a mechanism to selectively and intelligently cut off non-essential loads during periods of high demand or grid instability. In this article, we will see what load shedding, prioritized load shedding, techniques, challenges, and real-world examples of prioritized load shedding are.