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The ever increase of nonlinear loads in electric distribution networks causes many problems due to the high level of harmonic currents. This paper proposes a new technique for controlling a single phase shunt active power filter based on a selective compensation using the newly developed technique of harmonic control arrays. Simulation results confirm the appropriate selective harmonic compensation...
This paper is focused on the improvement of the grid current at the point of common coupling of a three-phase grid connected photovoltaic system supplying a non-linear load. This improvement is achieved by using the PV inverter as a shunt active power filter in addition to its main function of power injection in the grid. The shunt active power filtering is performed to compensate the disturbing grid...
This paper presents a novel control scheme for seven levels diode clamped multilevel inverter (DCMLI) topology based shunt hybrid active power filter which can compensate both dynamic reactive power and current harmonics in three phase three wire medium voltage distribution power systems as against many literatures that compensate fixed reactive power. It is on account of this novel control method,...
This paper designs a multifunctional grid-connected inverter (MFGCI) .It can both utilize the energy in green energy resource (GER) and energy storing device (ESD) and alleviate the harmonic pollution caused by propulsion system in ship power grid properly. Simultaneously, the volume of propulsion transformer is expected to be reduced and the PFD will be less-used or even out of work. The result of...
Power electronics plays an important role in controlling the grid-connected renewable energy sources. This paper presents a novel adaptive neuro-fuzzy control approach for the renewable interfacing inverter. The main objective is to achieve smooth bidirectional power flow and nonlinear unbalanced load compensation simultaneously, where the conventional proportional-integral controller may fail due...
This paper presents a Shunt Active Power Filter that is built using a current-source inverter. The control of the Active Filter relies in the p-q Theory with the “Sinusoidal Currents at Source” algorithm implemented. The Active Power Filter was simulated using two modulation techniques: Periodic Sampling and Carrier-Based Pulse Width Modulation (CBPWM). To assess the performance of the Active Filter,...
In recent years, voltage and current harmonic problems by the remarkable development of static power converters with nonlinear characteristics have been one of the significant subjects. The authors propose the three phase power quality compensator with five leg circuit by indirect power conversion method. This system can compensate the line voltage harmonics by the series inverter and the load current...
Current source inverter (CSI-fed induction motor drives are commonly used for high power applications without necessity to fast dynamic response. Although these kind of drives are more economic in high power ratings, they have some inherent disadvantages, that limit their applications. In this paper, in addition to presenting vector control system of CSI-fed induction motor drives, a novel method...
In this study, unified power quality conditioner (UPQC) is designed and simulated by synchronous reference frame theory. The proposed system is comprised of series and shunt inverters which can compensate the sag, swell and unbalance voltage, harmonics and also the reactive power. PI controller is used to stabilize DC link voltage and balance the active power between the shunt and series inverters...
In this paper a shunt active power filter (APF) has been used to eliminate current harmonics and compensate reactive current drawn by both nonlinear and linear loads. An online control method based on the discrete nonlinear model of inverters is proposed to APF. The optimal feedback controls the APF current in a very fast and efficient manner. Moreover, a novel extraction system based on the synchronous...
Fuel cell power systems have increasingly become popular because of their inherent advantages over conventional energy systems. A fuel cell system typically requires some kind of power conditioning that usually includes a DC-DC converter and a DC-AC inverter. In a single phase system, the operation of a single phase inverter introduces a second harmonic (120 Hz) current ripple into the system. This...
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