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Abstract

With the larger penetration of variable renewable energy resources, the role of energy storage in
the power system is becoming increasingly important. The flexibility of operation of hydro and
pumped-storage power plants and the variety of ancillary services that they provide to the grid
enable better utilization of variable renewable resources and more efficient and reliable operation
of the entire power system. The U.S. Department of Energy’s Water Power Program has funded
a recent study to enhance the modeling and simulation of advanced pumped-storage hydropower
(PSH) technologies and examine the value of different services and contributions that they can
provide to the power system. The technical approach consisted of two main components: (1)
advanced technology modeling and (2) detailed production cost and revenue simulations.
The advanced technology modeling focused on the development of dynamic simulation models
for advanced PSH technologies, such as adjustable-speed (AS) and ternary units. These new
models were developed as vendor-neutral models and published during the course of the project.
The production cost and revenue simulations focused on the Western Interconnection (WI). The
analyses were performed for the entire WI, for the California electricity market, and for a single
balancing authority, the Sacramento Municipal Utility District. The goal of the study was to
provide a comprehensive evaluation of PSH plants and their contributions to the power system.
The project team has used several computer tools, including the PSS®E, FESTIV, CHEERS, and
PLEXOS models, to simulate system operation and contributions of PSH plants. Advanced PSH
technologies, i.e., AS and ternary units, were also modeled. Detailed modeling and simulation
studies were performed using different time steps ranging from a fraction of a second to one
hour. This paper provides an overview of the simulations performed during the study and some
key results of the analyses.

Advanced Technology Modeling

Development and Testing of Dynamic PSH Models

Dynamic models for AS and ternary units were developed as vendor-neutral models and
described in several project reports that are publicly available [3–7]. The models were also
integrated into the Siemens PTI’s PSS®E software and added to the PSS®E library of dynamic
models. In addition, the vendor-neutral models (block diagrams and transfer functions) were
made publicly available for integration into other software tools.
The project team used the dynamic models of AS and ternary PSH units to conduct various
power system dynamic performance studies and analyze dynamic behavior of these technologies
and their impact on the power system.