Stabiliser Fault Emergency Control using Reconfiguration to Preserve Power System Stability

Pedersen, Andreas Søndergaard; Richter, Jan; Tabatabaei-Pour, M.; Jóhannsson, Hjörtur; Blanke, Mogens

doi:10.3182/20140824-6-za-1003.01293

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…The proposed method does not require changes in local controllers but accommodates faults by adding signals to their output. This paper also extends the work done in [20] by finding a reconfiguration that minimises damping degradation during fault, and also accounts for transmission delays in a wide-area communication system. The paper is organised as follows.…”

Section: Introductionmentioning

confidence: 59%

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Fault tolerant emergency control to preserve power system stability

Pedersen

Richter

Tabatabaei-Pour

et al. 2016

Control Engineering Practice

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This paper introduces a method for fault-masking and system reconfiguration in power transmission systems. The paper demonstrates how faults are handled by reconfiguring remaining controls through utilisation of wide-area measurement in real time. It is shown how reconfiguration can be obtained using a virtual actuator concept, which covers Lure-type systems. The paper shows the steps needed to calculate a virtual actuator, which relies on the solution of a linear matrix inequality. The solution is shown to work with existing controls by adding a compensation signal. Simulation results of a benchmark system show ability of the reconfiguration to maintain stability.

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Section: Introductionmentioning

confidence: 59%

“…To our knowledge, no previous attempt of wide-area fault compensation in stabilisers has been done before [20]. Design of wide-area stabilisers was pursued in [2], where locale controls were extended with remote measurements to improve observability of inter-area modes.…”

Section: Introductionmentioning

confidence: 99%

Fault tolerant emergency control to preserve power system stability

Pedersen

Richter

Tabatabaei-Pour

et al. 2016

Control Engineering Practice

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“…FTC for a system with additive Lipschitz nonlinearity subject to actuator faults using a virtual actuator is presented in [15]. Virtual actuator for Lur'e systems based on absolute stability theory is proposed in [16]. The method is applied to control reconfiguration of local controllers in a power system to preserve stability of the power system in case of failures in local stabilizers.…”

mentioning

confidence: 99%

Fault‐tolerant control of discrete‐time LPV systems using virtual actuators and sensors

Tabatabaeipour

Stoustrup

Bak

2014

Intl J Robust & Nonlinear

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This paper proposes a new fault-tolerant control (FTC) method for discrete-time linear parameter varying (LPV) systems using a reconfiguration block. The basic idea of the method is to achieve the FTC goal without redesigning the nominal controller by inserting a reconfiguration block between the plant and the nominal controller. The reconfiguration block is realized by an LPV virtual actuator and an LPV virtual sensor. Its goal is to transform the signals from the faulty system such that its behavior is similar to that of the nominal system from the viewpoint of the controller. Furthermore, it transforms the output of the controller for the faulty system such that the stability and performance goals are preserved. Input-to-state stabilizing LPV gains of the virtual actuator and sensor are obtained by solving LMIs. We show that separate design of these gains guarantees the input-to-state stability (ISS) of the closed-loop reconfigured system. Moreover, we obtain performances in terms of the ISS gains for the virtual actuator, the virtual sensor, and their interconnection. Minimizing these performances is formulated as convex optimization problems subject to LMI constraints. Finally, the effectiveness of the method is demonstrated via a numerical example and stator current control of an induction motor. 5 708 S. M. TABATABAEIPOUR, J. STOUSTRUP AND T. BAK PFTC solution is usually a conservative solution. Moreover, when some severe faults are taken into account, a common solution may not always exist, and if it exists, it usually yields a low performance. On the other hand, in AFTC, the controller reacts to the occurrence of faults and changes the parameters and/or the structure of the controller. A fault detection and estimation module is used to detect and estimate the fault when it occurs. Then, based on the information about the occurred fault, a supervisory controller changes the control law or the structure of the controller, in the case of severe faults, such that the faulty system with the new controller is stable and provides an acceptable performance. AFTC can usually provide a better performance because it changes or modifies the controller based on the characterizations of the occurred fault.In most of the AFTC methods developed in the literature, a specific controller is designed for each faulty case. When the fault is detected and estimated, the controller is switched to the controller designed specifically for the system subject to the detected fault. In this paper, the idea is to keep the nominal control in the loop and design a reconfiguration block, which is inserted between the faulty system and nominal system such that the overall stability of the closed-loop is preserved. This idea is depicted in Figure 1. The idea of control reconfiguration using a virtual sensor and actuator was first proposed in [6] and later in [7] for linear systems. The goal of the reconfiguration block is to transform the output of the faulty plant to an appropriate signal such that from the nominal controller's viewpoint...

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“…AFTC for a system with additive Lipschitz nonlinearity subject to actuator faults using a virtual actuator was presented in Khosrowjerdi and Barzegary (2013). Pedersen et al (2014) proposed a new design method for the virtual actuator based on absolute stability theory, which was tested for the reconfiguration of power systems subject to faults in local controllers in emergency situations.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Control of Input Affine Nonlinear Systems under Actuator Fault

Tabatabaeipour

Galeazzi

2015

IFAC-PapersOnLine

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This paper proposes a fault tolerant control method for input-affine nonlinear systems using a nonlinear reconfiguration block (RB). The basic idea of the method is to insert the RB between the plant and the nominal controller such that fault tolerance is achieved without re-designing the nominal controller. The role of the RB is twofold: on one hand it transforms the output of the faulty system such that its behaviour is similar to that of the nominal one from the controller's viewpoint; on the other hand it modifies the control input to the faulty system such that the stability of the reconfigured loop is preserved. The RB is realized by a virtual actuator and a reference model. Using notions of incremental and input-to-state stability (ISS), it is shown that ISS of the closed-loop reconfigured system can be achieved by the separate design of the virtual actuator. The proposed method does not need any knowledge of the nominal controller and only assumes that the nominal closed-loop system is ISS. The method is demonstrated on a dynamic positioning system for an offshore supply vessel, where the virtual actuator is designed using backstepping.

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Stabiliser Fault Emergency Control using Reconfiguration to Preserve Power System Stability

Cited by 4 publications

References 17 publications

Fault tolerant emergency control to preserve power system stability

Fault tolerant emergency control to preserve power system stability

Fault‐tolerant control of discrete‐time LPV systems using virtual actuators and sensors

Reconfigurable Control of Input Affine Nonlinear Systems under Actuator Fault

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