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This paper presents a single-phase dynamic voltage restorer (DVR) equipped with a high-frequency isolated soft-switching converter. The proposed DVR can maintain the load voltage stable and lower the harmonic distortion. Moreover, by using simple resonant units, all main switches are operated at zero-voltage-switching (ZVS) turn-on mode. Simultaneously, other auxiliary switches are operated at zero-current-switching...
A high performance three-phase active power filter is proposed in this paper. A novel circuit for detecting the amplitude of the active part of the fundamental load current is also proposed. The detection time of the current is not more than 1/4 cycle. Its transient response is superior to the other conventional techniques. Moreover, the proposed algorithm avoids the use of mains voltage signal in...
A single-stage power converter for dc uninterruptible power supply (UPS) is proposed in this paper. Basically the proposed converter is an integration result of a power factor correction circuit with a dc-to-dc converter to achieve simple hardware circuit, high efficiency, and low cost for extra UPS function. Under normal operation, a two-switch CUK converter operates as an ac to dc converter with...
A novel single-phase soft-switching AC/AC converter using a simple auxiliary resonant unit and a small AC capacitor is proposed. All main switching devices operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The advantages of this topology are found in efficiency improvement, reduced the voltage stresses, and greatly reduced...
A soft-switching single-phase unified power quality conditioner (UPQC) using simple resonant units is proposed in this paper. In the proposed UPQC, all main switches operate at zero-voltage-switching (ZVS) turn-on and all auxiliary switches operate at zero-current-switching (ZCS) turn-off. The proposed UPQC consists of a soft-switching series active power filter and a soft-switching shunt active power...
This paper presents an FPGA-based control circuit for controlling the soft-switching single-phase three-arm unified power quality conditioner (UPQC). The proposed soft-switching UPQC employs three-arm topology and uses simple resonant units. All main switches of the high-frequency arm operate at zero-voltage-switching (ZVS) turn on, while the auxiliary switches operate at zero-current-switching (ZCS)...
The system analysis and circuit implementation of a three-phase voltage-doubler soft-switching active power filter (VDSSAPF) comprising four main switches and four auxiliary switches is proposed in this paper. All main switches in the proposed VDSSAPF operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The reduction in the...
A novel soft-switching single-phase three-arm AC voltage regulator (SSTAVR) is proposed in this paper. The proposed AC voltage regulator (AVR) uses a three-arm topology that operates as a rectifier and an inverter. The rectifier arm is switched at high switching frequency, to perform power factor correction and simultaneously transfer the power demand for the load to the DC link capacitor. The inverter...
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