Fault tolerant control of Large Power Systems subject to sensor failure

Abstract

Quality of sensor measurements and their availability is highly important in control of power systems. In this paper, we address fault tolerant control of Large Power Systems (LPS) subject to sensor failure. We assume that observability of subsystem encountering with fault is violated, states cannot be estimated by reliance of faulty subsystem. We use a new method for reconfiguration control of the faults which lead to unobservability of subsystems. The method proposes to augment subsystems to obtaining a new subsystem which is observable, and find best subsystems among the other candidates. By hiding the fault from the controller, it allows the nominal controller to remain in the loop. The proposed approach is applied to IEEE 14-bus test case while interactions are considered in nonlinear form. The Simulation results show that the proposed approach works properly.