Thesis
Distributed generation dispatch in islanded distribution systems: imbalance and slack bus modeling studies
Master of Science (M.S.), Drexel University
Feb 2019
DOI:
https://doi.org/10.17918/nxr8-xj65
Abstract
Distribution systems have evolved into a complex participant in the overall power infrastructure. Both nationally and internationally, a push for increasing distributed energy resources has been made through economic policies for their environmental favorability and promise of service reliability. This, in turn, has led consumers and power system planners to consider partitioning larger networks into smaller, self-serviced subsystems, or microgrids, especially in cases of larger grid (e.g. transmission system) outages. Thus, traditional methods of distribution system planning and analysis need to be reevaluated. This thesis looks at the challenges associated with operating islanded distribution systems with a variety of distributed generation (DG) sources available. With fewer means of control, unbalanced loading, and the introduction of single-phase sources, such as photovoltaics and batteries, maintaining system balance needs to be considered. In addition, because of limited generating capacity, the impact of the slack bus model and its location in power flow analyses is studied. Emphasis is then placed on determining the commitment and economic dispatch of available DG, and how these can be used to regulate imbalance levels. This work presents modeling of distributed energy resources and imbalance metrics, a comprehensive cost minimization formulation, and a method for finding feasible dispatch schemes. Simulation results were obtained on a 64-bus islanded distribution network. Multiple sets of simulations were performed to see the effects different DG types and levels of penetration have on overall microgrid operation. The results show how different slack bus locations and corresponding dispatch decisions can improve or worsen operating costs and system-wide imbalance levels.
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Details
- Title
- Distributed generation dispatch in islanded distribution systems
- Creators
- Zachary Land Minter - DU
- Contributors
- Karen Nan Miu (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- ix, 102 pages
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Electrical (and Computer) Engineering (1970-2026); Drexel University
- Other Identifier
- 9393; 991014632236304721