Thesis
Design and real-time validation of set point modulation-based control strategies for microgrids
Washington State University
Master of Science (MS), Washington State University
2014
Handle:
https://hdl.handle.net/2376/101253
Abstract
Power system controllers are designed and tuned to improve dynamic response under normal system conditions. However, system changes and events (e.g., microgrid islanding) can significantly alter previously assumed system parameters. In such systems, controllers may not be properly tuned for the new conditions, enabling large transients to cause violations in system operational limits. This thesis focuses on control strategies for distributed energy resource (DER) units to mitigate potentially harmful transients, as well as to improve set point tracking during system events. This thesis proposes an improved prediction algorithm, called quadratic prediction, for set point automatic adjustment with correction enabled (SPAACE). SPAACE is a strategy for mitigating transients of controllable units. The strategy works by tracking the response of a system (e.g., current and voltage) and modulating the set point to manipulate its trajectory . By observing the trend of the response, SPAACE can also predict future values and modulate the set point based on forecasted violations. This thesis also proposes a method for identifying the parameters of a controllable unit whose response is modeled as a second-order system. By observing the model during iv set point changes, a close approximation of these parameters are calculated. These values are then applied to transient mitigation techniques that require an accurate model of the system to function. In particular, the use of half-cycle Posicast with parameter identification is proposed. Case studies are presented using a Real-Time Digital Simulator, the PSCAD/EMTDS software environment, and MATLAB programming environment. All proposed strategies are implemented in MATLAB, but only SPAACE strategies are implemented in PSCAD and RTDS. Case studies presented demonstrate viability and improvement over existing strategies under various scenarios.
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Details
- Title
- Design and real-time validation of set point modulation-based control strategies for microgrids
- Creators
- Christopher Stone
- Contributors
- Ali Mehrizi-Sani (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525112201842
- Language
- English
- Resource Type
- Thesis