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In this paper, a Three level NPC four leg inverter is used as a shunt active power filter (SAPF), and the Three level Three Dimensional Space Vector Modulation technique in the aßo axes (3-level 3D SVM) for generate the switching signals of this SAPF for power quality improvements under balanced and unbalanced loads are proposed. In order to, improved the output voltage forms, lower switching losses,...
This essay deals with an improved active power filter based on the generalized instantaneous reactive power theory, of which the instruction current is calculated simply; which also will not be affected by voltage distortion and can be applied to unbalanced load current. The whole structure of electrical circuit is simple and has a good economy performance for this active power filter which only has...
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...
Current source rectifiers constitute a commonly used topology in high power applications, featuring several advantages such as regeneration capability and high quality currents. This paper presents a simple predictive control scheme for a current source rectifier. Main achievements of the here presented control scheme are the simplicity in controlling the dc link current and the generation of currents...
Boost active power factor corrector operating in a borderline or critical conduction mode is reexamined. Approximate analytical expressions of the inductor RMS current as well as estimation of power factor of the APFC are obtained. Based on the proposed theory, the paper suggests simple design criteria for the line filter
This paper describes a method for reducing harmonics of the input ac currents of the three-phase diode rectifier circuits. By adding a circuit, which serves with low switching frequencies, input voltage waveforms in the proposed rectifier can be improved. In this paper the proposed method are discussed by operating principle and analyzing waveform. The proposed rectifier circuit gives excellent input...
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