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D12: Generation Dispatch Utilizes Energy Storage to Balance Renewable Variability
Abstract:

One of the obstacles to achieving higher penetration of large-scale renewable energy such as wind and solar power is the variable nature of these resources. Sudden weather changes can lead to corresponding variations in generation output across the service territory, potentially causing grid instability. This use case describes how monitoring the real-time status of renewable energy resources can increase the Independent System Operator's (ISO) and SCE's effectiveness in handling this variability. Possessing real-time status information about renewable resources allows the ISO to fill any energy shortfalls (or address any surpluses) to preserve grid stability. A possible means of balancing this variability is to deploy energy storage devices as either participating variable generation or participating variable load resources. The use of energy storage devices introduces a need for real-time communications to monitor and control these resources. Examples of high capacity energy storage resources that can discharge energy instantaneously include pumped storage, batteries, flywheels, superconducting magnetic energy storage, ultra-capacitors, and aggregated plug-in electric vehicles. Another means is to use load control devices that can be dispatched to reduce consumption or, in times of excess low-cost renewable generation resources, to increase power consumption. The benefits of these monitoring and control functions include improved system reliability, reduced greenhouse gas emissions, reduced costs, and other societal benefits.

Year Published:
2009
Source:
Southern California Edison
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