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Asynchronous automata networks are commonly used to describe discrete-event systems consisting of several components. The components used here behave asynchronously since this is usually the case for a large class of automation systems. The asynchronous behavior is based on the ability of certain components to change their state regardless of other component's behavior in the network. This paper deals...
Multi-megawatt photovoltaic (PV) power plants are widespread in electrical power systems because of the drastic decrease in the PV panel prices. The multi-string structure is considered for high power PV systems due to the increase in the overall energy conversion efficiency and the modularity when compared to the centralized topology. High power conversion can be achieved easily using parallel connection...
This paper presents a model predictive control method applied to a single phase grid-connected inverter. The method uses a discrete-time model of the system to predict the future value of the load current by using all possible voltage vectors generated by the inverter. The voltage vector which minimizes a quality function is selected. Then, use the switch state deduced by the select voltage vector...
Multi-megawatt photovoltaic (PV) power plants are widespread in electrical power systems because of the drastic decrease in the PV panel prices. The multi-string structure is considered for high power PV systems due to the increase in the overall energy conversion efficiency and the modularity when compared to the centralized topology. High power conversion can be achieved easily using parallel connection...
This paper proposes an approach to detect the open-circuit faults in a five-phase voltage source inverter. The inverter is modulated with space vector PWM. However, the proposed approach is independent of the modulation technique. The open-circuit faults under study are single transistor open-circuit, single inverter switch open-circuit, double-transistors open-circuit, double-switches open-circuit,...
This paper develops indirect space vector modulation technique for a three- to nine-phase matrix converter. The proposed technique is based on the double-stage configuration in which the matrix converter is modeled as three-phase rectifier followed by a nine-phase inverter. Both rectifier and inverter stages are controlled using space-vector modulation technique. In the rectifier stage, the modulation...
In this paper, space vector pulse width modulation (SVPWM) scheme for voltage fed inverter (VFI) using conventional method and artificial neural network (ANN) based approach are presented separately. In the conventional method, the difficulty of explicitly expressing cross-over and holding-angle as a function of modulation factor in overmodulation mode-I and mode-II respectively are overcome by introducing...
Direct Torque Control (DTC) of induction motor is a scalar control technique that gives excellent torque dynamic performance. Deriving the advantages of multilevel inverter, a modified DTC is proposed in this paper for the induction motor, driven by a cascaded three-level inverter. The proposed DTC gives superior torque performance compared to the use of Field Oriented Control (FOC) under transient...
This paper presents a performance comparison study between the space-vector and carrier-based PWM techniques used for neutral point clamped (NPC) 3-level inverter. A reduced switching loss based modulation technique is used for the SVPWM scheme and a third harmonic injected PWM technique is used for the carrier-based PWM scheme. A 110 kW surface-PMSM is used with the NPC inverter, as generally being...
This paper presents an AC drive system based on six-phase machine with three neutrals. The machine side converter has nine power legs and can be connected to the grid through one single DC-link or three isolated DC-links. Compared with the conventional back-to-back AC six-phase machine drive system, the proposed drive system permits reducing the DC-link voltages, eliminating step-up transformer, and...
In this paper, space vector pulse width modulation (SVPWM) scheme for voltage fed inverter (VFI) using conventional method and artificial neural network (ANN) based approach are presented separately. In the conventional method, the difficulty of explicitly expressing cross-over and holding-angle as a function of modulation factor in overmodulation mode-I and mode-II respectively are overcome by introducing...
Space vector modulated voltage-source inverters require an overmodulation algorithm for continuous control of line-side voltage during overmodulation and for a smooth transition from PWM to six-step mode. Overmodulation increases the dc bus utilisation of a voltage source inverter, but requires significantly higher computational effort than linear modulation. This paper proposes a novel single-zone...
This paper presents a commutation technique to overcome the effects of transformer leakage inductance in a single stage high frequency ac-link transformer isolated inverter. The presence of leakage inductance causes large voltage spikes across the transformer due to the switched nature of link current that is encountered in direct high frequency ac link to low frequency ac conversion. This paper proposes...
Two phase spot welding machines create large unbalance within three phase currents. This causes deterioration of quality of the voltage at point of common coupling (PCC). Moreover, the industrial customers which create such large current unbalance escape the financial penalization because the unbalance in power does not reflect anywhere in the readings of energy meter which reads active energy consumption...
In this paper a single-stage solar Photo Voltaic (PV) system feeding the power to an Open-End Winding Induction Motor (OEWIM) via a dual-inverter is presented. The OEWIM is coupled to a centrifugal pump for water pumping application. The dual-inverter fed OEWIM is chosen, as it requires low debus voltage which helps in optimal arrangement of PV modules, which could avoid large strings. In the proposed...
This article proposes a space-vector based pulse width modulation (SVPWM) scheme for a three-level dual-inverter-fed open-end winding induction motor drive. The proposed method introduces clamping of one inverter for 180° span of the rotation of the reference space vector. The proposed scheme neither requires sector identification nor lookup tables for the generation of the gating pulses. The switching...
This paper proposes an efficient neutral point control algorithm for three level T-type inverters. The proposed algorithm helps to get balanced neutral point voltage with high efficiency steady state operation. The proposed controller relies on using the hysteresis control for DC link capacitors' voltage balancing. The proposed algorithm is implemented by adjusting the type of redundant small vectors...
This paper presents developed compact algorithms of space vector pulse width modulation (SVPWM) for six-switch and four-switch three-phase inverter. Calculations of the desired voltage vector in the PMSM drive are presented, an optimal voltage vector sequence and scaling factors for SVM has been derived to synthesize the reference voltage vector in each sampling period for healthy and fault drive...
Multi-phase motor drives are now a day's considered for numerous applications due to the advantages that they offer when compared to their Three-phase counterparts. Proper modeling of inverters and motors are important in devising an appropriate control algorithm. This paper develops a complete modeling of a five-phase inverter and Five Phase space vector modulation schemes which can be used for Five-Phase...
The control systems typically use the conventional PID (Proportional, Integral, Derivative) controller to control the direct current (DC) voltage [1]. The obtained control results are relatively well when PID controller is applied, but the design parameters are not absolutely precise and sensitive to the changes of system parameters. The PID controller is used to control the frequency of three-phase...
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