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The Vienna rectifier is a unidirectional boost type improved power quality ac-dc converter (IPQC). The rectifier topology is capable of providing a dc output voltage that is higher than the ac source voltage with improved power factor. The topology is compatible with the hysteresis current control (HCC) technique. It has the capacity to provide almost unity power factor with low current distortion...
A three-phase symmetrical multipulse modulated (SMM) ac chopper containing six four-quadrant switch (4QSW) realizations is used. Each 4SQW encompasses a power MOSFET. The three 4QSW realizations intended for freewheeling are connected across the load line terminals while the other three are connected in series with the three-phase supply terminals. The source and load currents, and the load voltage...
Climate change because of the greenhouse effect has been authenticated. Fallouts like the 2015 Chennai floods suggest techniques like precision agriculture that includes automation in the irrigation system are important. This paper suggests an economical and easy-to-use arduino-based automated irrigation system that utilizes the Android smart phone for remote control. The system design includes a...
This paper presents the single-phase sinusoidal pulse width modulated ac chopper topology with power MOSFET embedded four-quadrant switch (4QSW) realizations and examines from the power quality viewpoint the potential for its use in ac power control. The examination is conducted for resistive and inductive loads by theoretical estimate of the current harmonic content at the ac utility and load. Sinusoidal...
In the commercial sector single-phase, non-linear loads are predominant and their numbers are on the increase. These low-power loads include conventional single-phase power supplies, switch mode power supplies, fluorescent lamps, heating elements and; pumps and motors for ventilation, air-conditioning and elevators. The two-pulse rectifier is the most popular single-phase topology deployed for ac-dc...
In the commercial sector single-phase, non-linear loads are predominant and their numbers are on the increase. The two-pulse diode bridge rectifier is the most popular single-phase topology deployed for ac-dc conversion of electrical energy; however, when feeding an inductive load, its line current has a total harmonic distortion of around 28%, that is a gross violation of contemporary power quality...
In the commercial sector single-phase, non-linear loads are predominant and their numbers are on the increase. The two-pulse diode bridge rectifier is the most popular single-phase topology deployed for ac-dc conversion of electrical energy; however, when feeding an inductive load, its line current has a total harmonic distortion of around 28%, that is a gross violation of contemporary power quality...
The matrix converter topology is a versatile one that is capable of functioning as an ac regulator and as a cycloconverter. The topology has been used for ac-ac conversion for various applications that involve variable voltage and variable frequency. Various pulse width modulation (PWM) techniques have been implemented in the topology to reduce the harmonic distortion and obtain better power quality...
The bi-directional boost type improved power quality ac-dc converter (IPQC) is capable of providing transformerless power transfer between a high voltage dc (HVDC) link and a relatively low voltage ac system with improved power quality at input ac mains in terms of high power factor and low total harmonic distortion (THD). The current forced control (CFC) strategy is implemented in the three-phase...
The bi-directional boost type improved power quality ac-dc converter (IPQC) is capable of providing transformerless power transfer between a high voltage dc (HVDC) link and a relatively low voltage ac system with improved power quality at input ac mains in terms of high power factor and low total harmonic distortion (THD). The current forced control (CFC) strategy is implemented in the single- phase...
The 3-phase diode bridge rectifier has the least line current distortion among 6-pulse rectifiers; however, its total harmonic distortion (THD) of 31.08% violates power quality standards. This paper reports distortion reduction by lowering magnitudes of harmonics in the line currents using a delta-wye transformer between the 3-phase utility and the diode bridge rectifier. The leakage inductances of...
Two 24-pulse rectifier topologies based on phase shifting by conventional magnetics is proposed. Four 3-phase systems are obtained from a single 3-phase source using novel interconnection of conventional single- and 3-phase transformers. Phase shifts of 15° and 30° are made using phasor addition of relevant line voltages with a combination of single-phase and three-phase transformers respectively...
The phase-controlled dc drive operation is well established, however, this paper investigates the operation of the separately excited dc machine in each of the four quadrants when fed by the symmetrical multipulse modulated, improved power quality, single-phase, dual buck converter. The armature control of the dc machine with constant load torque is undertaken in both clockwise and anticlockwise directions...
A 24-pulse rectifier topology based on phase shifting by conventional magnetics is proposed. Four 3-phase systems are obtained from a single 3-phase source using novel interconnection of conventional single- and 3-phase transformers. From two 30° displaced 3-phase systems feeding two 6-pulse rectifiers that are series connected, a 12-pulse rectifier topology is obtained. Thus, from the four 3-phase...
Single- and three-phase topologies of the bi-directional a.c. controller, comprising power MOSFET embedded four-quadrant switch (4QSW) realizations operating in high-frequency chopping mode are presented. The performance of the controller with inductive load is assessed for power quality. A three-phase, three-wire, wye-connected inductive load is considered and the corresponding gate controls has...
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