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.
The configuration of a single-phase AC-DC converter plus a three-phase inverter traction system has been widely applied in high-speed railway electrical drive systems. With the single-phase power feeder, the instantaneous power is fluctuating at twice of the power line frequency, and so is the DC-link voltage. Associated with the DC-link voltage fluctuation is a severe problem, when the electric frequency...
The static synchronous compensator(STATCOM) using power electronics as a shunt device of the Flexible AC Transmission Systems (FACTS) is attracting an increasing interest in power system research and in electric utilities. This paper proposes a novel multi-level structure topology with zigzag transformer for three-level inverter used in STATCOM. Moreover, selective harmonic elimination pulsewidth...
In this paper is presented a method for modelling and simulation in Simulink/Matlab environment of the single-phase diode clamped multilevel inverters and capacitor clamped multilevel inverters. The models presented are used to perform a harmonic analysis of the output voltage of these multilevel inverters. The command method used in this work is based on the sinusoidal PWM.
This paper presents a novel control scheme suitable for high-power high-performance AC power supplies. The performances of the conventional current-regulated voltage-controlled system with bipolar PWM are first analyzed in detail. The proposed control scheme incorporates dual synchronous PWM technique of single-phase full-bridge inverter and multiple feedback loop. Thanks to this scheme, the AC power...
Multilevel inverters have been important devices developed in recent years, owing to their capability to increase the voltage and power delivered to the load. Researches done based on basic inverter topologies show that, multilevel inverters have many advantages such as low power dissipation on power switches, low harmonic and low electromagnetic interference (EMI) outputs. A modified sinusoidal pulse...
This paper proposes a multilevel inverter which produces hexagonal voltage space vector structure in lower modulation region and a 12-sided polygonal space vector structure in the over-modulation region. Normal conventional multilevel inverter produces 6nplusmn1 (n=odd) harmonics in the phase voltage during over-modulation and in the extreme square wave mode operation. However, this inverter produces...
In order to reduce the switching frequencies of power semiconductors, synchronous optimal pulse width modulation provides an appropriate solution. The switching angles result from complex offline calculations, assuming steady-state operation. Medium voltage drives when applied to the retrofit of existing fixed speed induction motors often include an output LC-filter which introduces a resonant circuit...
With the increasing of the wind turbine capacity, inverter paralleling is one of the best approaches for MW-level wind power converter system design. This paper presents a new control algorithm for paralleling inverters based on SVPWM, which can reduce the output harmonic currents and inhibit the circulating current between the inverters. The detailed algorithm principles and mathematic derivations...
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.