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This article presents speed controlling for single phase induction motor. Principally, 9-level, diode-clamp inverter used to control voltages per frequency is widely used because of its high efficiency to control the motor. In this article, ARM7 model ADU7024 is used as microcontroller to generate eight pulse signals and send to the output voltage amplifier by co-connecting to the modulation module...
Three-level inverters and relative techniques have been concerned more and more in industrial drive applications because of the outstanding performance. The aim of this paper is to present a strategy for the sensorless vector control of Permanent Magnet Synchronous Motor (PMSM) drive fed with a three-level Neutral-Point-Clamped (NPC) inverter. By measuring the different current change rates which...
This paper proposes a new extended boost quasi Z-source inverter (ZSI) and a simple modulation and control method based on one-cycle control for controlling a grid connected PEM fuel cell energy system. ZSIs are gaining popularity. Similarly one-cycle controllers are becoming popular due to their simplicity, ease of implementation and fast response. However, this control method has not been developed...
In this contribution a new balanced biphase modulator topology is presented. The new biphase modulator allows the reduction of the resulting chip area occupation by using 3 couplers only, in contrast with traditional reflection-type balanced biphase modulators with 4 couplers, and exhibiting comparable performances. A 45-65 GHz test vehicle adopting the proposed topology has been designed and realised...
The current source back-to-back converters have been largely neglected because of the slow transient response and low power factor, which is mainly resulted from a fixed PWM pattern and a poor control method. However, current source converters have intrinsic advantages such as the high reliability and the inherent current limiting capability. Due to these advantages, more and more people have been...
The multiple overlap mode of the overlap carrier wave phase shift PWM (SVPWM) inverter is one of the development directions of the super-high capacity inverter, this paper reasons the relation between carrier wave phase shift SVPWM circuit output voltage and phase shift angle, put forward the best phase shift angle formula, proposed two kinds of control schemes and compares them. Through the experiment...
This paper presents a three-level rectifier with reduced number of power switches based on one-cycle control. Only six power switches with voltage rating of half DC-link are adopted in this multilevel rectifier. A nonlinear control method, one-cycle control, is used to control the rectifier. The controller is composed of some integrators with reset, flip-flops, comparators and linear components, which...
Five-level inverter has been applied to industry and railway traction to solve the difficulty in applying low-voltage or medium-voltage switch devices to high-voltage system. The basic principle of diode-clamped five-level inverter is analysed in this paper. Based on the analysis of diode-clamped three-level inverter, single pulse control method, pulse width modulation(PWM) control methods and a novel...
Because of the unbalanced construction, the conventional three-phase three-leg inverters produce huge amount of common-mode (CM) voltage. This paper proposes a novel sinusoidal pulse width modulation (SPWM) control strategy based on three-phase four-leg structure. This strategy is an improved method on the basis of the SPWM carrier phase-shifting control technology. In the new method, the state of...
Z-Source inverters have recently been proposed as new power conversion concept as they have both voltage buck and boost features. A unique impedance network between the power source and converter circuit provides both voltage buck and boost properties, which cannot be achieved with conventional voltage-source and current-source inverters. This paper presents a neural network control system that control...
For the medium or low voltage high-current applications, combined three-phase inverter topology is presented and mathematical model in dq coordinates is built. Several current-limiting methods are commonly used. They have their own shortcomings. Thus, a new strategy of hardware blockage with instantaneous currents, combined by software current limit with the average current is presented. Using fast...
Based on the space vector pulse width modulation (SVPWM) principle, the detailed SVPWM algorithm is derived in this paper and some improvements have been made taking over modulation and sector transition into consideration. Then the improved algorithm is simulated under MATLAB/SIMULINK. Multiple modulating methods-continuous and discontinuous are achieved in the simulation by changing some particular...
This paper analyzed the neutral-point balancing problem of the neutral-point-clamped (NPC) three-level space voltage vector pulse-width modulation (SVPWM) inverter and the influence of each vector to the neutral-point voltage. Based on the normal control strategies to solve the neutral-point balancing problem, including the open-circuit passive control strategy, the hysteresis-band control strategy,...
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