Operating and Planning Electricity Grids with Variable Renewable Generation : Review of Emerging Lessons from Selected Operational Experiences and Desktop Studies
The development of wind-and solar-generating capacity is growing rapidly around the world as policy makers pursue various energy policy objectives. This paper will describe the challenges in integrating wind and solar generation, the lessons learned, and recommended strategies from both operating experience and integration studies. Case studies on the experience with wind and solar integration in China, Germany, and Spain are also included in this paper. The paper is organized as follows. First section summarizes worldwide wind and solar development, the challenges in integrating wind and solar generation, and some of the lessons learned from studies designed to evaluate the impact of higher levels of wind and solar generation and also from the operational experience in some countries with larger amounts of renewable energy. The second section summarizes some of the solutions for incorporating higher levels of wind and solar capacity into short-term system operations. This section also explains basic methodologies to implement system operations studies to understand the impacts of variability in system operation. The third section explains the contribution of variable renewables to long-term supply adequacy-commonly called 'firm' power-and the relationship of this to long-term reserves; it also explores how these issues can be incorporated into long-term planning or adequacy assessments. Overall, the variability of wind power generation adds to the variability on the grid in most time scales, and a key question that wind integration studies must address is whether there is enough existing capability on the grid to manage that increased variability, or whether new sources, such as new generation or increased levels of demand response, must be added to manage that variability.
| Summary: | The development of wind-and
solar-generating capacity is growing rapidly around the
world as policy makers pursue various energy policy
objectives. This paper will describe the challenges in
integrating wind and solar generation, the lessons learned,
and recommended strategies from both operating experience
and integration studies. Case studies on the experience with
wind and solar integration in China, Germany, and Spain are
also included in this paper. The paper is organized as
follows. First section summarizes worldwide wind and solar
development, the challenges in integrating wind and solar
generation, and some of the lessons learned from studies
designed to evaluate the impact of higher levels of wind and
solar generation and also from the operational experience in
some countries with larger amounts of renewable energy. The
second section summarizes some of the solutions for
incorporating higher levels of wind and solar capacity into
short-term system operations. This section also explains
basic methodologies to implement system operations studies
to understand the impacts of variability in system
operation. The third section explains the contribution of
variable renewables to long-term supply adequacy-commonly
called 'firm' power-and the relationship of this
to long-term reserves; it also explores how these issues can
be incorporated into long-term planning or adequacy
assessments. Overall, the variability of wind power
generation adds to the variability on the grid in most time
scales, and a key question that wind integration studies
must address is whether there is enough existing capability
on the grid to manage that increased variability, or whether
new sources, such as new generation or increased levels of
demand response, must be added to manage that variability. |
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