Fault Tolerant Control of Power Systems in presence of Sensor Failure

TL;DR

This paper presents a novel fault tolerant control method for large power systems that maintains system stability despite sensor failures by reconfiguring subsystems to ensure observability, demonstrated on the IEEE 14-bus test case.

Contribution

A new reconfiguration control approach that augments subsystems to restore observability under sensor faults in power systems.

Findings

The proposed method successfully maintains control during sensor faults.

Simulation on IEEE 14-bus case confirms effectiveness.

The approach handles nonlinear interactions in power systems.

Abstract

This paper addresses Fault Tolerant Control (FTC) of Large Power Systems (LPS) subject to sensor failure. Hiding the fault from the controller allows the nominal controller to remain in the loop. We assume specific faults that violate observability of a subsystem, and we cannot rely on these faulty subsystems when estimating states. We use a new method for reconfiguration control of these faults that lead to unobservability of subsystems. The method proposes augmenting a faulty subsystems with another subsystem(s) until a new subsystem is achieved that is observable. Next, finding the best subsystems among available candidates is considered and using structural analysis methods and grammian definition, a complete algorithm is proposed for FTC of LPS. The proposed approach is applied to the IEEE 14-bus test case and interactions are considered in nonlinear form. Simulation results show that the proposed approach works as intended.