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There are few of transient control models are adapted to asynchronous induction coil launcher (AICL) with air core coil. Thus, many papers about AICL were written with the goal of increasing muzzle velocity of projectile. This paper concentrate on how to control the projectile speed and thrust accurately by using improved current filament (CF) method and variable voltage variable frequency (VVVF)...
During recent years, most of the attention to multilevel inverters has been focused on control algorithm. While, the defects of SVPWM algorithm is caused by classic space vector theory based on traditional coordinate system such as mass of computation and low efficient of controller. In this framework, this paper presents a new simplified space vector modulation scheme, which is based on G-H coordinate...
This paper focuses on the model predictive current control of power converters with the aim of indicating the influence of some system parameters used in predictive control on the load current and load voltage. A model predictive current control algorithm is proposed, specifically directed at the utilization of power obtained from renewable energy systems (RESs). In this study the renewable energy...
This paper presents the options for determining power losses in the system consisting of indirect frequency converter and induction machine. A mathematical model for calculation of individual losses in machine as well as in converter is presented herein. The model allows the determination of losses both in steady states and in the course of transients, e.g. starting, braking, load change. The model...
This paper presents the design and implementation of a modular single phase multilevel inverter using the asymmetric cascade multilevel converter type. The converter output allows 7, 15 and 31 levels and use the step modulation strategy. The selective harmonic elimination (SHE) technique was used for the computation of the firing angles. All the results were simulated in MATLAB professional software...
The traction converter system of EMU is constructed based on Matlab/Simulink. The system consists of a transformer, a rectifier, an inverter and an induction motor. The rectifier is controlled by the transient current control theory with SPWM technology. In the inverter the indirect vector control theory with current hysteretic band PWM strategy is adopted. Based on the system the traction control...
Multilevel line commutated inverters for renewable energy systems have gained popularity in recent times, especially in the distributed generation where a number of batteries, fuel cells, solar cell, and micro-turbines can be connected through a MLC to feed the grid. They can synthesize higher output voltage levels and can generate near sinusoidal voltages. This paper presents analysis of a grid connected...
Static Synchronous Compensator (STATCOM) is one of the key device and key technology of FACTS. It can not only compensate the reactive power of electric power system, but also improve the property of steady state and dynamic state. This paper presents a STATCOM based on controlled reactor because of the STATCOM being used at present has some disadvantages. Then it can compensate much more reactive...
Classic SPWM control mainly focused on making the output voltage of inverter transformer as close as possible to the sine wave, did not take into account the output current waveform. The voltage space vector PWM (SVPWM) control, considering the inverter and AC motor as an integral whole, control the inverter in accordance with the circular track of the rotating magnetic field, can work better. In...
This paper presents a Flywheel Energy Storage System based on the Z-source inverter with maximum boost control. The proposed system can boost and generate a desired output voltage efficiently when low voltage of the generator is introduced due to the low flywheel speed. Z-source inverter has been identified to exhibit both voltage buck and boost capabilities in steady-state. In order to provide the...
The Flywheel Energy Storage System (FESS) based on the Z-source inverter is proposed in this paper. The proposed system can boost and generate a desired output voltage efficiently when low voltage of the generator is introduced due to the low flywheel speed. The topology of the system is introduced and the control strategies for the system are analyzed. Z-source inverter, which is used in Flywheel...
Aiming at the power device open and close faults occurred in the inverter, GUI based simulation platform for inverter drive system under fault condition is studied primarily in this dissertation. Using the S-function block of the MATLAB, the S function of the motor is written. The SIMULINK blocks of the inverter under different power device faults condition are built by the basic blocks of MATLAB/SIMULINK...
This paper presents a review of some techniques for islanding detection, especially by using inverter based DG applications and it also focuses on several islanding detection methods for a single-phase current-control voltage inverter working with a PV system connected into the grid. It is deliberated a single-phase inverter with maximum power of 5 kW. Islanding detection methods are investigated,...
There are several conventional selected harmonic elimination techniques that form a class of pulse width modulation techniques (SHEPWM) that are very effective compared to other PWM schemes in the elimination of the low-order harmonics. However they suffer from a complicated computational process especially if the number of low order harmonics to be eliminated is high. This paper presents a new technique...
In this paper, a novel topology of APFC with on-line half-bridge UPS controlled by DSP is presented. The operation principle is analyzed. In order to improve the dynamic response feature of APFC and make the design of LC filter easy, improved current hysteretic control is proposed. A digital control scheme based on DSP is presented. The control model of APFC is simulated with Matlab. In order to verify...
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