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In the actual power system three-phase voltages are distorted and asymmetric and contain a large number of negative sequence components. Traditional ip-iq method which detect harmonic currents based on instantaneous reactive power theory will be inaccurate, so the positive sequence voltage component of A-phase need be extracted. Improved instantaneous symmetrical components structured a rotary phases...
This paper presents a one stage circuit topology for a double buck chopper type single phase PFC converter with active power filtering function in a utility AC grid side and DC output power quality, which can realize much smaller in reactor size and lighter in its weight, along with two unique channel control schemes. The main advantageous point of the newly-proposed PFC converter includes that the...
This paper proposes a new high-efficiency solar power conditioner suitable for interface with thin-film solar cells, which is composed of a zigzag-connected chopper (ZCC) converter and a series active power filter. The ZCC converter provides a bipolar rectangle voltage pulse, even where the negative terminal of the dc input is grounded without line- or high-frequency transformer. The series active...
The authors have devised a novel PWM control scheme capable of controlling a designated order harmonic while other low harmonic components are eliminated, based on the conventional low harmonic component elimination PWM control scheme. And it experimentally proved that the harmonic voltage in power systems could be suppressed, by means of controlling a self-commutated rectifier as a shunt active filter...
The presence of current harmonics in the grid causes major problems such as overheating and electromagnetic emissions. Active Power Filters (APF) have been presented as alternative to reduce such harmonics. In this paper, a new constant-frequency control scheme based on the linear decoupling principle is proposed for a shunt three-phase fourwire APF. The APF is used to compensate the current distortion...
Description of PWM and sliding-mode controls implied to series active power filters is given. Structural schemas for both control methods are given. Simulation and experimental results are put as well as a comparison between the two control methods.
A method is proposed in this paper for designing a series active harmonic filter which can eliminate voltage harmonic present in the busbar voltage by producing of a PWM controlled harmonic voltage. According to this method the active filter produces PWM voltage that cancels completely the existing harmonic voltage due to any harmonic voltage source up to any order. The proposed method is valid for...
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