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E – 1515 DOE – Flywheel Energy Storage for Area Regulation

Intended Audience: ngineers working for electricity storage vendors, technology developers, system integrators and advocates

PDH UNITS: 1

0 STUDENTS ENROLLED

    Regulation of an electrical grid involves balancing electricity supply capacity with the minute-to-minute fluctuations of electricity demand. The need for cost-effective regulation is growing rapidly as variable sources of power such as wind and solar power generation become more common. Currently most regulation is provided by conventional thermal electric generation plants. These plants provide ‘up’ regulation by increasing output when electricity demand exceeds supply and ‘down’ regulation by reducing output when electricity supply exceeds demand. An alternative to using generation for regulation is to use storage. The storage facility provides up regulation by discharging energy into the grid and down regulation by absorbing energy from the grid. Notably, the rate of power from (or into) flywheel energy storage can change much more rapidly than output from thermal electric generation plants. Generation plants’ output (up or down) changes by percentage points per minute whereas flywheels’ output can change from full output (discharge) to full input (charging) – and vice versa – within a few seconds.

    This course describes a flywheel’s ability to follow a rapidly changing control signal in a way that the value of regulation from the flywheel is worth significantly more than regulation provided by generation plants. The course documents a particular demonstration plant’s performance as a high-value regulation resource and the possible financial costs and benefits from a commercial flywheel storage plant used as a regulation resource.

    This course is based on the Sandia Report, SAND2009-6457, “Benefits from Flywheel Energy Storage for Area Regulation in California—Demonstration Results” by Jim Eyer, October 2009.

    Learning Objectives – Knowledge & Skills:

    The course is designed to provide engineers with the following specific knowledge and skills.

    • Flywheels energy storage’s overall performance as a regulation resource
    • Advantage that flywheels have over generation for regulation
    • A methodology for evaluating flywheel storage cost and performance
    • Financial viability of using flywheel storage as a grid regulation
      resource

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