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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
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When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
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Observer Based Multi-Level Fault Reconstruction for Interconnected Systems.

Mei Zhang1, Boutaïeb Dahhou2, Qinmu Wu1

  • 1Guizhou Provincial Key Laboratory of Internet Plus Collaborative Intelligent Manufacturing Electrical Engineering School, Guizhou University, Guiyang 550025, China.

Entropy (Basel, Switzerland)
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

This study presents a geometric method for fault reconstruction in interconnected systems. The approach uses observers and differential algebra to accurately diagnose and reconstruct faults in low-level subsystems using high-level outputs.

Keywords:
global reconstrucabilityinterconnected systemlocal reconstrucabilitylocal unknown inputreduce-order uncertain observer

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Area of Science:

  • Control Systems Engineering
  • Applied Mathematics
  • System Dynamics

Background:

  • Interconnected systems present challenges in local fault reconstruction.
  • Traditional fault diagnosis (FD) methods may struggle with complex system architectures.
  • Accurate fault reconstruction (FR) is crucial for system reliability and safety.

Purpose of the Study:

  • To develop a geometric method for local fault reconstruction in interconnected systems.
  • To investigate the reconstruction of low-level subsystem faults using high-level subsystem outputs.
  • To validate the proposed approach through numerical simulations.

Main Methods:

  • A geometric method combining observer-based techniques and differential algebra.
  • Introduction of fault as an additional state for observer-based estimation.
  • Utilizing sliding mode observers and inverse techniques to estimate unknown auxiliary outputs.
  • Employing estimated auxiliary outputs as virtual sensors for a reduced-order observer.

Main Results:

  • Successful asymptotic estimation of the fault variable.
  • Demonstration of multi-level fault reconstruction capabilities.
  • Validation of the method's effectiveness on an intensified heat exchanger model.

Conclusions:

  • The proposed observer-based geometric method effectively reconstructs local faults in interconnected systems.
  • The approach enables accurate fault diagnosis and reconstruction even with unknown subsystem outputs.
  • The method is validated and applicable to complex systems like intensified heat exchangers.