Clean Currents 2022

Hydropower Modeling Gaps in Power Systems Planning and Operational Studies

Continuous increase in penetration of renewables and retirement of traditional coal-fired, natural gas and nuclear based generators impose more burden on hydro resources needed to provide regulation and load following. Modeling of hydro generation in power system software has not changed over the decades and, as the role of hydro generation is changing, new expected modes of operation will push the boundary of existing models. In that context, it is timely to examine gaps in modeling of hydro-based generation in steady-state and dynamic simulation studies as represented in power system simulation software.

The following gaps has been identified in close collaboration with the industry:
-Water availability in steady-state and dynamic models is not properly represented
-Interdependences among hydro projects are not properly represented
-Water and environmental constraints are not represented in models
-Rough zones are not represented in the power system model so generation dispatch in system studies might not be realistic
-Many dynamic models of hydro generation turbines are outdated
-Frequency response is often optimistic
-The power system is not planned for various water availability such as high- and low-water conditions in combination with a large amount of renewable generation

To conduct accurate planning and operation studies, and ensure the grid operates reliably, it is vital to model hydro generation with more accuracy, particularly in regard to water availability. The intent is for steady-state and time-domain simulation of the system to match reality as closely as possible and avoid unrealistic expectations from hydro-based generation. This work addresses above mentioned modeling gaps and provide recommendations for mitigation of same.

Presenter Information

Slaven Kincic

Slaven Kincic
Power System Research Engineer
Pacific Northwest National Laboratory (PNNL), U.S. Department of Energy
Poster Presenter