The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
With a focus on reducing the emission caused by fossil fuel generated power sources, inclination of industry and researchers have turned towards renewable energy sources. Power generation via photovoltaic and wind energy system gained immense importance over the past decade. The major challenge is posed by the intermittent nature of renewable energy sources. These challenges have made researchers...
The paper presents fault tolerant control algorithms of modified space vector pulse width modulation (SVPWM) for three-phase inverter supplies a PMSM in case of failure of one transistor leg. Fault tolerant inverter structure with four-switch is analyzed with taking into account the non-ideal DC link. Calculations of the desired voltage vector in the PMSM drive are presented. An optimal voltage vector...
Three phase ac drives using a dc link typically feature a significant amount of dc energy storage to maintain a stiff dc bus. This paper examines the concept of reducing the size of the dc link capacitor dramatically, to store just enough energy to provide one high frequency switching cycle of output power. The dc bus is no longer stiff and hence the classical sinusoidal pulse width modulation cannot...
An FPGA implementation of Model Predictive Direct Current Control (MPDCC) is reported in this paper. A central scheduler enumerates switching sequences and assigns these to several explorer units, which predict the system response and compute their associated cost. The proposed FPGA design is scalable, modular and requires little hardware resources. A five-level active neutral point clamped inverter...
In this article, we present a modeling of Direct Torque Control to improve the whole inconvenient by a system with discrete events, which is used to control asynchronous machines. This model is designed through the description of three-phase to two-phase transformation, torque and flux estimator, stator flux comparator, stator flux position detector, switching table and machine model. The complications...
Compared to the three-level neutral point clamped (3L-NPC) inverter, its simplified version, the 3L-SNPC, uses fewer switching devices to achieve a multi-level output. However, it offers fewer voltage vector selections, limiting its usefulness for motor drive applications. This issue is overcome through a proposed direct torque control (DTC) strategy utilizing the concept of virtual voltage vectors...
The direct model predictive control (MPC) problem for linear systems with integer inputs, such as many power electronic systems, can be formulated as an integer least-squares (ILS) optimization problem. However, solving this problem when state and/or output constraints are explicitly included is challenging. In this paper, a method that allows to effectively use the sphere decoder — even in the presence...
Computational burden is a major hurdle for practical implementation of finite-state predictive torque control (FS-PTC) of motor drive fed by a multi-level inverter. One of the reasons of computational complexity is that all voltage vectors are evaluated for prediction and actuation. This paper proposes selected number of voltage vectors for the prediction and actuation, which are called prediction...
In this paper we present a computationally efficient implementation of the sphere decoder, which is employed to solve the integer least-squares (ILS) problem underlying direct model predictive control (MPC) for power electronic applications. The introduced modifications take advantage of the structure of the problem and, as a result, the required real-time operations can be reduced to a minimum. The...
Predictive current control is described for an Induction Machine in this paper. Instead of the cascaded PI control systems, the proposed system directly generates switching vectors by evaluating the designed cost function, which reduces the tuning parameters. An observer is applied for the sensorless system, whcih has the merit of low cost. The system is verified by experimental results.
In order to reduce the voltage source type inverter output voltage distortion which caused by dead zone, we analyze the reason of dead zone, then sum up three reasons, list the calculation formula of error voltage which applied to induction motor vector control, finally compensate the dead zone by adding error voltage to inverter. Firstly, calculate the relationship between error time and error current...
In this paper, aimed at the neutral-point potential unbalance of the three-level neutral point clamped inverter, an improved new control scheme about neutral-point potential balance was proposed and a simplified direct torque prediction scheme was used for induction motor fed by three-level inverter. Firstly, stator voltage vectors to be applied at the next time was preselected by the torque prediction...
The paper describes the different level in asymmetrical cascaded multilevel inverter using various level-shifted carrier-based PWM techniques. And with Series and parallel combination of switches helps in reducing the semiconductor current and voltage rating. The laod taken is IM load. For different levels, No. of H Bridge are increased to get the desired result. Simulation technique that is MATLAB-SIMULINK...
The objective of this paper is to evaluate the performance of a vector controlled asymmetrical two-phase induction generator (TPIG) using a three-leg voltage source inverter. The proposed method is a decoupling scheme by controlling flux and torque separately. Improved performance is achieved by compensated stator currents. Matlab/Simulink software is applied to the presented system under various...
The effect of inverter dead-time on the inverter output voltage is well studied in literature. This paper studies the effect of the dead-time on the inverter input current, and includes this effect in the dc link dynamic model of a diode-bridge-rectifier (DBR) fed voltage source inverter (VSI). Based on this study, this paper proposes a dynamic model of a rectifier-inverter-fed induction motor, that...
This paper presents the design and implementation of induction machine drives by estimating a slip in fluid load and the Variable Voltage Variable Frequency (VVVF) drive scheme based on Sinusoidal Pulse Width Modulation (SPWM) technique for a three phase induction motor has been applied for use. The work involves implementation of a closed-loop control scheme for an induction motor. The VVVF technique...
In this paper, a modeling approach of a three phase power inverter based on an electrostatic synchronous machine is presented. By the proposed approach, any inverter-based distributed generator in a microgrid can be replaced by an equivalent electrostatic machine. This paper aims to promote the use of the proposed modeling approach in the analysis of microgrid stability. Thanks to the proposed modeling...
In this paper, design of permanent magnetic synchronous motor drive with sinusoidal excitation is pursued with the aim of technical reliability increase and implementation cost decrease. In this regard, the constraints in the way toward motor manufacture are mentioned. Then, steps are taken to cope with these issues by appropriate designing of controller and drive. Cost-effectiveness and ease of implementation...
Process and manufacturing industries are using Field Oriented control (FOC) to drive the induction motor for desired performance. To perform FOC, rotor speed and stator current are sensed and fed back to the controller and the speed control of motor is achieved through an inverter connected either in stator or rotor circuit. Hence, the control system heavily depends on feedback signals and inverter...
Current sensor is the important information acquisition device of CRH2 EMU, when the current sensor appear performance degeneration, fault or failure, it will affect the performance of the system control and monitor. For this purpose, a new method of multi fault diagnosis of traction motor current sensor based on state observer for CRH2 EMU traction motor is proposed. Based on the mathematical model...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.