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.
In this paper, cascade H-bridge converter with Variable-Frequency Carrier Bands PWM method (VFCB-PWM) has been proposed, which is the combination of cascade structure and CPS-SPWM method. High equivalent switching frequency can be obtained with low switching frequency devices. Such advantages as simple structure, wide bandwidth and good transient response can be obtained in large power equipment....
With the application of multilevel inverter in the high voltage and large power occasions in recent years, its modulation strategy has become a research hot point in the field of power electronics. As STATCOM is a typical application of multilevel converter, its common modulation strategies such as Step Wave modulation, Specific Harmonic Elimination modulation, Carrier PWM modulation, Space Vector...
In this paper, a new PWM technique for induction motor drives involving six concentric dodecagonal space vector structures is proposed. Apart from increasing the linear modulation range compared to a hexagonal space vector structure, the proposed configuration helps in total elimination of 5th and 7th order harmonics from the phase voltage throughout the modulation range. Thus, it is possible to operate...
In high power applications the inverter of a motor drive should have a switching frequency as low as possible in order to reduce the switching and snubber losses. An effective pulse width modulation (PWM) approach that can be utilized successfully with high control accuracy is combination of selective harmonic elimination and pulse width modulation (SHEPWM). This technique offers many advantages other...
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...
A comparison of sinusoidal pulse width modulation (SPWM) and selective harmonic elimination (SHE) in a multicell DC/AC converter is presented. The genetic algorithm finds the existence optimal solution set of switching angles for each required harmonic profile. The dc links of each full bridge cell are supplied by individual high frequency DC-DC isolation stages which are connected in parallel considering...
This paper presents a novel topology of a three-level current source PWM inverter used for a grid connected power conditioner. The circuit can be operated at higher switching frequency because all power switches are connected at common-source configuration. Using this common-source current-source inverter (CS-CSI) the number of gate drive power supply can dramatically be reduced into only a single...
Harmonics and switching frequency cause a major problem in power system. A novel harmonic elimination technique and low switching frequency in a three-phase pulse width modulation (PWM) inverter are proposed in this paper. This inverter is associated with a LC filter. The technique determines the commutation angles based by solving a set of nonlinear system equations. This commutation angles are determined...
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.