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This paper presents a Direct Torque Control (DTC) of induction motor drives utilizing 3-level neutral-point clamped (NPC) multilevel inverter. This research aims to provide a simple strategy to address capacitor voltage balancing problem of NPC inverter as well as produce better performance for DTC of induction motor in term of reducing torque ripple and high switching frequency. The proposed method...
In this paper, a cascaded sliding mode control strategy is proposed for a grid-connected inverter system to simultaneously improve the power quality of the local load voltage and the injected grid current. This control scheme also enables a novel seamless transfer operation between grid-connected and stand-alone mode. The controller comprises of an inner voltage loop with proportional controller and...
This paper gives a comprehensive study of the novel 3-phase 4-wire H-bridge interleaved buck active power filter (H-bridge IB-APF) which eliminates current harmonics without shoot-through phenomenon and with no dead time effect. In this topology, three single phase H-bridge interleaved buck inverter is being connected with each particular phase and neutral and can be used for high voltage, medium-to-high...
In the present circumstances in order to gratify the supply demand equation of electrical power the renewable energy source is the only alternative. However it is very difficult to comprehend and exploit renewable energy due to its stochastic character. That's why it is often cited as an obstacle for the grid integration. In most of the cases current controlled pulse width modulated voltage source...
This paper presents a detailed mathematical study on design and analysis of user-defined constant switching (UDCS) in current control of four-leg inverter based distribution static compensator (DSTATCOM). By this scheme the square wave pulse of user-defined frequency given to the fourth leg of the inverter makes the other legs to operate in constant switching frequency mode. In this paper the authors...
SIMULINK implementation of an artificial neural network (ANN) based Direct Torque Control (DTC) of Induction Motor Drive is presented in this paper. DTC is one of the most advanced control methods. Using DTC, an induction motor is driven by an inverter whose switching pattern is determined by the errors in the reference and estimated values of the machine flux and torque. To optimize the performance...
This paper presents an optimal switching strategy employed in direct torque control (DTC) of induction machine utilizing dual-inverter supplied drive. In the proposed switching strategy, the utilization of appropriate amplitude of voltage vectors based on machine operating condition can reduce the rate change of torque slope while improving the performance of DTC drive in term of torque ripple reduction...
This paper presents the advantage of using optimal PI parameter tuning strategy of constant switching method in the three phase Direct torque control (DTC) scheme. The DTC system is known to offer fast decoupled control of torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, which are the variable inverter switching frequency and high torque output ripple...
In this paper, Distribution Static Compensator (DSTATCOM) is used for power factor correction, harmonics mitigation, and balancing of source currents in distribution system. In existing DSTATCOM control algorithms, dc-link voltage is maintained constant by dc voltage regulation loop (or PI controller), which give Ρloss term of Voltage Source Inverter (VSI). In the proposed method, power quality improvement...
The simulation of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Various simulations, varying the torque and current tolerances, are carried out in the low torque and high torque range. Simulation results show a direct influence...
This paper presents a sliding mode control for a three-phase grid-connected voltage source inverter with vector operation. The design of closed-loop system is based on the sliding-mode theory, and it is carried out with the help of a converter large-signal dynamic model. The closed-loop system improves the transient response and minimizes the steady-state error. Essentially, the contribution of this...
A composite space vector hysteresis current controller (CSVHCC) is proposed in this paper to control the three phase power converter. The duration of the modulation period is divided into two parts. One part for the carrier comparison controllers is to minimize errors at low frequency and provide a basic switching sequence. The other part for space vector hysteresis current controller (SVHCC) is to...
A photovoltaic (PV) supported cascaded H-Bridge multilevel inverter can be used to transfer the bulk solar power to the grid. It is considered that the dc link of the H-bridges is supplied from the PV array. The five-level cascaded H-bridge inverter enhances the power transfer rating and improves the output quality with carrier phase-shifted method of current control. Under varying radiation level...
Power semiconductor losses of hysteresis current controlled grid connected 2-level and 3-level ANPC inverters will be presented in this paper. A special focus will be on the calculations for currents consisting of two components, one current with the frequency of the grid and one with a harmonic frequency. These currents are typical for inverters in grid impedance measurement and inverters with active...
The application of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) in the dynamic state is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Positive and negative torque setpoint steps are simulated in the low torque and high torque range. Simulation results show that the number...
This paper presents subthreshold digital circuit design and optimization method using Schmitt trigger logic gates for enhanced electromagnetic immunity. The proposed Schmitt trigger logic gates are based on a buffer design using dynamic threshold-voltage MOS for low-power operation. By expanding the Schmitt trigger to NAND/NOR gate, we can dramatically improve the noise immunity with much lower switching...
This paper presents a three-level neutral point clamped voltage source inverter with hysteresis voltage control. Output characteristics of the converter and voltage control for a voltage source inverter are described. A simulation model of a three-level neutral point clamped inverter with a control system based on the hysteresis voltage control was developed. Basic diagrams that demonstrate performance...
This paper proposes a new hysteresis based predictive current control of neutral clamped inverter for DSTATCOM application. This method uses a possible voltage vector to predict future injected compensator current and minimum quality functions selected. The control directly provides compensator currents from the predicted values once the zero error is verified. The performance of proposed current...
As the power demand increases rapidly in the electricity market the use of renewable energy sources also increasing. Renewable sources are significantly different from the traditional power sources due to their stochastic nature. Therefore it is a tough task to integrate renewable energy sources with the existing utility grid. In order to ensure the grid reliability, current controlled Pulse Width...
This paper analyzes the different conventional voltage source inverter (VSI) topologies for High voltage distribution system to realize Distribution Static Compensator (DSTATCOM). The reference currents are extracted through instantaneous symmetrical component theory. To check the performance of DSTATCOM for high voltage distribution system, different inverter topologies are implemented under unbalanced...
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