Robust Trajectory-Constrained Frequency Control for Microgrids Considering Model Linearization Error

The capability to switch between grid-connected and islanded modes has promoted adoption of microgrid technology for powering remote locations. Stabilizing frequency during the islanding event, however, is a challenging control task, particularly under high penetration of converter-interfaced source...

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Bibliographic Details
Published in:arXiv.org 2021-02
Main Authors: Zhang, Yichen, Chen, Chen, Hong, Tianqi, Cui, Bai, Chen, Bo, Qiu, Feng
Format: Article
Language:English
Subjects:
Computer simulation
Control tasks
Converters
Distributed generation
Electric power systems
Linearization
Mathematical models
Optimal control
Real time
Robustness (mathematics)
Synthesis
Turbogenerators
Uncertainty
Wind turbines
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Summary:The capability to switch between grid-connected and islanded modes has promoted adoption of microgrid technology for powering remote locations. Stabilizing frequency during the islanding event, however, is a challenging control task, particularly under high penetration of converter-interfaced sources. In this paper, a numerical optimal control (NOC)-based control synthesis methodology is proposed for preparedness of microgrid islanding that ensure guaranteed performance. The key feature of the proposed paradigm is near real-time centralized scheduling for real-time decentralized executing. For tractable computation, linearized models are used in the problem formulation. To accommodate the linearization errors, interval analysis is employed to compute linearization-induced uncertainty as numerical intervals so that the NOC problem can be formulated into a robust mixed-integer linear program. The proposed control is verified on the full nonlinear model in Simulink. The simulation results shown effectiveness of the proposed control paradigm and the necessity of considering linearization-induced uncertainty.
ISSN:2331-8422