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... required control signals are generated by the FTC block. Figure 4 shows general FTS architecture. Upon the fault detection, the fault tolerant control (FTC) block makes the suitable changes in the references, the controller and the system and switches the redundant part in the case of an FTS with redundancy. ...
Context 2
... required control signals are generated by the FTC block. Figure 4 shows general FTS architecture. Upon the fault detection, the fault tolerant control (FTC) block makes the suitable changes in the references, the controller and the system and switches the redundant part in the case of an FTS with redundancy. ...
Context 3
... required control signals are generated by the FTC block. Figure 4 shows general FTS architecture. Upon the fault detection, the fault tolerant control (FTC) block makes the suitable changes in the references, the controller and the system and switches the redundant part in the case of an FTS with redundancy. ...
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This study proposes a modified modulated model predictive control (MMPC) scheme to control an open-end winding induction motor drive using an asymmetric source dual inverter with one floating bridge. The control algorithm uses a modulation algorithm within the cost function optimisation scheme to avoid variable switching frequency. The voltage of t...
Citations
... In this study, the fault detection method is based on the comparison between measured and estimated pole voltages of converter, v k0m and v k0es (k = 1, 2, 3), respectively [22,23]. The estimated voltages v k0es can be expressed by the fol- ...
... In this hypothesis, the previous analytical study demonstrated that the possible fault of a switch can be detected by a simple comparison between the measured voltage vk0m and the estimated voltage v k0es . However, in real case, because of turn-off and turn-on propagation time and interlock dead time generated by the switches drivers, the voltage error ε k0 is not null and constituted of peaks during switching time [22,23]. In fact, to avoid the detections errors due to semiconductor switching, the absolute value of the voltage error |ε k0 | is firstly compared with the threshold value 'h', to determine if the difference between the measured and estimated voltages is large enough to be considered a fault as shown in Fig. 8. ...
Inverter is an essential component of a grid connected PV system. In fact, an open-switch fault in this power converter could result an important system malfunction and consequently leads to system disconnection. In this context, this paper focuses on the fault-tolerant control of PWM-inverter with redundancy leg for grid-connected PV system. In addition, a fast method of fault detection and compensation is used to maintain the continuous operation of the converter when there is a half-leg open-circuit fault (IGBT+ anti-parallel diode) on one of PWM-inverter legs. Therefore, it can detect this type of fault and compensate it in less than 50 μs by using a time criterion instead of voltage criterion. Also, the fuzzy logic technique is employed to control the active and reactive power injected into the network without exceeding the whole system power capacity limits. Note that, in this study, the active and reactive power references of the chosen operating point (the reactive-to-active power ratio: tgφ = Q/P = 0.19) are based on experimental tests. Simulation results show the feasibility and the effectiveness of the proposed fault diagnosis method in terms of fault detection and service continuity in presence of a half-leg open-circuit fault in PWM-inverter without any over-rating of the PV system components or instability.
... Also it preferred for frequently applications operating in regenerative mode such as electric drives especially where the AC rectifier is part of the controller (Fig. 2). According to the closing or opening of the switches, k ij branch voltages can be equal to Uc or 0. Introduces another variable S 11 , S 21 and S 31 which taking 1 if the switch k i1 is closed or −1 if the switch opened (Fig. 3) [16][17][18][19][20][21]: ...
The purpose of this paper is the study by simulation of a fault tolerant control with Pulse Width Modulation (PWM) AC-DC-AC converter supplying a three-phase rotor field oriented induction motor. The back to back converter, is supplied with three-phase network and composed of a PWM rectifier and a voltage source inverter. Fault tolerant topology of AC-DC-AC converter that without redundancy have been studied and associated with affective and fast method of fault detection and compensation to guarantee the continuity of service, in the presence of a possible open circuit failure on the level of one of their legs. Although of the presence of open circuit on the level of one of the converter legs the control based on the Zero Sequence Signal (ZSS) assure the service continuity, the simulation results obtained prove that it is possible to maintain the good performance of the drive without redundancy leg (6/5 topology).
... In other words, the FTC should avoid the area of danger where the performance is unacceptable. [3][4][5][6] Several researchers were published in the field of material reconfiguration of the static converter (inverter), wherein the authors 7 studied the various PWM inverter fault-tolerant topologies of the variable speed for electric vehicles, which the strategy of detection, insulation, and reconfiguration of the IGBT open circuit fault to operate in degraded mode, some control topologies based on classic vector control such as: 4-wire and 4-leg PWM inverter topologies are investigated. The work of authors 8 consists of new diagnostic techniques based on the Park vectors associated with polar coordinates for the detection and localization of the IGBT open circuit fault as well as the integration of fault-tolerant reconfigurable with redundancy leg inverter in order to enable continuity of service of the wind power system. ...
The purpose of this paper is to design the robust fault‐tolerant control FTC open‐circuit fault IGBT's, first of all. The modeling and control of the induction motor in the healthy inverter and in the faulty inverter (open‐circuit fault at the IGBT switch) are proposed. Furthermore, the technique for detection and location the open‐circuit fault an IGBT based on the Park vector combined with the polar coordinate. In order to ensure the service continuity of the system, two methods of tolerance are developed: the first method, the indirect vector control with H ∞ controller of the induction motor fed by a three‐phase inverter based on the fault compensation. The second method, the indirect vector control of the induction motor fed by a three‐phase inverter with the redundant leg. Finally, comparative study between the two techniques of tolerance is carried out. The performance of each technique is confirmed by experimental results.
... In the existing literature, many approaches have been suggested for speed sensorless vector control induction motor drives. These methods are based on the: Model Reference Adaptive System (MRAS) [7][8][9], Extended Luenberger observers [10][11], Extended Kalman filter (EKF) [12][13][14][15][16][17], artificial neural network (ANN) [18]. ...
... It will be assumed that w(t) and v(t) are not correlated and zero-mean stochastic processes. From the statistic point of view, the stochastic processes w(t) and v(t) are characterized by the covariance matrices Q and R respectively [15] [16]. Therefore, Q and R can be expressed as: ...
... This process is iterated and the state model is relinearized in each new state [3,15]. where, the following steps are given by [12] [17]: ...
In this paper, an efficient control of the dual-stator induction motor (DSIM) using indirect vector control and elaborated by different observers to estimate the rotor flux and the rotor speed. After presenting Park model of the DSIM, we applied the field oriented control (FOC) to decoupling the flux and the electromagnetic torque to control the speed of the machine which is fed by a cascade of two voltage inverters on three levels. Secondly, the same control structure of the indirect vector control is used, but, we introduced model reference adaptive system (MRAS) and an extended Kalman filter (EKF) to estimate the rotor flux, the rotor speed and both stator and rotor resistance of the machine for speed sensor less control purposes. Finally the Simulations with genetic algorithms show that the results are very encouraging and achieve good performances.
The purpose of this paper is the study by simulation of a fault-tolerant control with Pulse Width Modulation (PWM) ac-dc-ac converter supplying a three-phase rotor field-oriented induction motor. Before fault occurrence, the fault-tolerant converter operates like a conventional back-to-back six-leg converter and after the fault; it becomes a five-leg converter. Fault-tolerant topology of ac-dc-ac converter that without redundancy have been studied and associated with affective and fast method of fault detection and compensation to guarantee the continuity of service, in the presence of a possible open circuit failure on the level of one of their legs. Although of the presence of open circuit on the level of one of the converter legs the control based on the Zero Sequence Signal (ZSS) assure the service continuity, the simulation results obtained prove that it is possible to maintain the good performance of the drive without redundancy leg (6/5 topology).
