1,720,979 research outputs found
SWITCHED OPTIMAL PREDICTIVE CURRENT CONTROL TECHNIQUE FOR IMPROVED QUANTUM BOOST SRC
No full textA dynamic model and a switched optimal predictive current control technique for an improved quantum boost series resonant convertor (SRC) are proposed to overcome the inherent disadvantages of the quantum SRC. With this technique, the current ripple and the overshoot can be minimised and the buck-boost operation can also be achieved
Estimation of phase currents from a DC-link current sensor using space vector PWM method
No full textThe single-current sensor technique obtaining three phase currents from only a DC-link current sensor has been applied to reduce the cost and increase the reliability for various voltage-fed PWM inverters; however, in this technique there are some practical problems, such as unreliable detection of phase currents and phase shift. A new method that overcomes these problems by employing the estimation scheme with identified system parameters is proposed. The Space Vector PWM (SVPWM) strategy is modified to generate the switching pattern, adequate for the proposed method. To obtain a good detection in spite of parameter uncertainties, system parameters used in the estimation method are identified using a recursive feast square method (RLSM). Experimental results show that the proposed scheme not only provides a very good detection method for three phase currents without current sensors, but also identifies system parameters very well. This proposed method is very simple, has a small detection error, and gives the information on system parameters
Detection of Three-Phase Currents in Space-Vector PWM Inverter with Only One DC Link Current Sensor
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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