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At present, the One-Cycle Control of Active Power Filter has two serious problems. One is that this method can just compensate the harmonic and reactive power at the same time, which can not be eliminated separately. The other is that the tracking current will be affected and have huge error when the mains voltage appears distortion. So, through the hard work, in this paper, we adopt the method to...
In three-phase four-wire systems and unbalanced mode, the four-leg inverters have been considered as one of the adapted topologies of the power converters for the application which require a very strict and precise control of the neutral current, caused by the unbalanced and/or nonlinear load or unbalanced source. In this paper, we present a theoretical study of the control technique for this inverter...
Industrial installations require high reliability and performance, especially when the power system has a low short-circuit level and non-linear loads injecting harmonics which can generate electromagnetic interferences EMC/EMI threatening functionality and safety related with control and protection systems. Conventional passive harmonic filters compensate reactive power, and reduce parallel resonances...
This paper presents a shunt active power filter application mainly for source current harmonic elimination. The proposed control method is based on instantaneous reactive power theory. A three-phase voltage source inverter bridge with a dc bus capacitor is used as an APF. It requires measuring the source currents with reduced number of current sensors than the existing methods. The source currents...
A new control strategy is developed for a four-level flying capacitor multilevel inverter to function as an active power filter (APF). This employs space vector modulation (SVM) scheme. However inverter switching vectors and sequences are determined according to the swings of capacitor voltage values at each level. A modified predictive current control law is developed This takes into account the...
This paper investigates the multi-sampling techniques applied to the current control in active power filter applications. In active power filter applications with digital control, the main bandwidth limitation derives from A/D conversion time, calculation delays and the sample-and-hold effect for the Digital-Pulse-Width Modulation (DPWM). Using Field Programmable Gate Arrays (FPGAs) and fast A/D converters...
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