چکیده :
Hydroelectric generation has the ability to buffer intermittent renewable generation. The objective of this
paper is to explore the changing roles of hydropower and pumped storage dispatch in response to
increasing renewable penetrations. A novel aggregate model of hydro resources in the state of California
is used in conjunction with the Holistic Grid Resource Integration and Deployment model (HiGRID), a
modeling tool that resolves hourly grid resource dispatch and management, to observe the impacts of
increasing renewable penetration. The effects on the grid are explored by incrementally increasing the
installed wind and solar capacity to meet the electric demand for California while re-dispatching hydro
energy and capacity resources to balance the electrical power system. Increasing renewable generation
results in increased periods of over generation, reducing the practical achievable renewable penetration.
By adjusting the dispatch of hydropower to complement renewable generation a significant increase in
the achievable renewable penetration can be implemented (8.0% for solar only, 2.2% for wind only and
2.8% for 50/50 mixture of wind and solar). Additionally, dispatching hydro to support renewables serves
to increase the system-wide capacity factor, delay the onset of curtailment, and reduce the total curtailment
at corresponding renewable penetrations
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