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, an analysis is given to the topology of cascaded seven-level inverter. Then its simulation model is set up. On the other hand, several carrier control strategies are discussed, modeled and applied for the control of this multilevel inverter respectively, including phase disposition, phase opposition disposition and alternative phase opposition disposition. Then the switching control...
The focus of this paper is to improve self-sensing performance of interior permanent magnet synchronous machine (IPMSM) by modifying rotor configurations. Field intensified IPMSM (FIIPMSM) is designed by adding flux barriers in the rotor of an IPMSM. In comparison with IPMSMs, FIIPMSMs have the advantage of decoupling saturation-induced saliency, cross-coupling effects and also secondary saliencies,...
In the model reference adaptive system (MRAS) implemented in the two-axis stationary reference frame, the convergence performance is poor due to the cross feedback relationship between the alpha-axis component and beta-axis component of the rotor flux when the discrete-time calculation is operated. In this paper, a MRAS implemented in the synchronous rotating reference frame is proposed to identify...
Nowadays, the most widely used variable speed wind turbine type for units above 1 MW is doubly fed induction generator (DFIG). As the wind power penetration continues to increase, wind turbines are required to remain connected during grid faults to ride-through the faults. This paper gives a control oriented modeling of DFIG wind turbines by using causal ordering graph (COG). The control system consists...
Phase-locked loop (PLL) has been widely used in the doubly-fed wind power generation system (DFWG) to obtain the phase angle of the utility voltage accurately. But in weak power grid, the dynamic of PLL is coupled with DFWG controller and this may cause wind turbine system instability. This paper presents the impact of PLL on the DFWG system stability. In order to investigate the system stability,...
To reduce control systempsilas cost and complexity of permanent magnet synchronous motors (PMSM), mechanical sensorless control is becoming a research focus. This paper presents a novel high frequency (HF) signal injection method for the mechanical sensorless control of surface mounted permanent magnet synchronous motors (SPMSM) in low speed and even zero speed regions based on the little saturation...
This paper presents a speed fluctuation reducing method for sensor-less PMSM-compressor system in air-conditioners. The rotor speed and position are estimated based on model reference adaptive system(MRAS) method. A combined control method for the q-axis reference current is proposed to resolve the dilemma of PI tuning problems in conventional vector control system and reduce the speed fluctuation...
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.