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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 novel soft-switching single-phase three-arm dynamic voltage restorer (DVR) is analyzed and designed. The proposed soft-switching three-arm DVR which can solve the abnormal voltage problems such as voltage swell, voltage sag, over-voltage, under-voltage and harmonics. The proposed scheme is composed of a three-arm topology which operates as a rectifier and an inverter. Rather than the conventional...
This paper presents a soft-switching three-phase five-arm ac voltage regulator. It can solve the unusual voltage situations such as under-voltage, over-voltage, voltage sag, voltage swell and three-phase unbalanced source and load. Also, the proposed voltage regulator not only maintains a stable output voltage but corrects the input current to achieve a unity power factor. The proposed scheme combines...
This paper presents a soft-switching modular three-phase ac voltage regulator which can solve the abnormal voltage problems such as under-voltage, over-voltage, voltage sag and voltage swell. The proposed scheme is the combination of three single-phase modules while each one of the single-phase module is a serial compensation ac voltage regulator. Besides, each one of the single-phase module is composed...
A modular three-phase voltage regulator with a fictitious dc-link is proposed. The proposed scheme is the combination of three single-phase modules while each one of the single-phase module is a three-leg ac voltage regulator. Therefore, the proposed voltage regulator reduces the number of main switches and compensates the voltage of each phase independently. Furthermore, a small film ac capacitor...
This paper proposes the design and implementation of a field-programmable gate array (FPGA)-based drive system for a rotor flux oriented vector-controlled induction motor drive. The system is realized by using FPGA (XC2V250) from Xilinx and its related hardware circuit. A vector oriented control structure using integer arithmetic has been developed for the voltage control of induction motors. The...
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...
This paper presents a soft-switching single-phase three-arm dynamic voltage restorer which aimed at solving voltage disturbances such as voltage swell, voltage sag, over-voltage and under-voltage. The proposed scheme is composed of a three-arm topology which operates as a rectifier and an inverter. Rather than the conventional four-arm topology, the proposed three-arm topology not only reduces the...
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...
A three-leg AC voltage regulator with a fictitious dc-link is proposed. The proposed scheme combines a rectifier with an inverter in a stage. Hence, the proposed voltage regulator not only reduces the number of main switches but also decreases the cost. A small AC capacitor is used, which makes it possible to replace an electrolytic capacitor with a film capacitor, not only the size of the dc link...
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)...
In this paper, a novel soft-switching three-arm series-compensation automatic voltage regulator is proposed. The proposed automatic 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 system analysis and circuit implementation of a reduced parts three-phase soft-switching inverter (THSSI) comprising four main switches and four auxiliary switches is proposed in this paper. All main switches in the proposed THSSI operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-on and turn-off. Since the control circuits...
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...
This paper proposed a novel single-phase soft-switching unipolar PWM active power filter (SSUPAPF). The proposed active power filter uses a simple auxiliary resonant circuit. The main switches of high-frequency arm operate at zero-voltage- switching (ZVS) turn-on. Also, the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The main switches of low-frequency arm operate at 60Hz to...
A novel four main switches and four auxiliary switches power converter configuration of the three-phase voltage-doubler soft-switching rectifier is proposed in this paper. The reduction in the number of main switches can also increase the reliability because the control circuits and the auxiliary circuits are thereby reduced to two sets. All main switches in the proposed rectifier operate at zero-voltage-switching...
This paper proposed a novel single-phase soft-switching unipolar PWM rectifier (SSUPR) using a simple auxiliary resonant unit. All main switches of high-frequency arm operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-off. All main switches of low-frequency arm operate at 60 Hz to greatly reduce switching losses. Moreover, a soft-switching...
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