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LLC resonant converter is proposed for Front End DC/DC conversion application. Three advantages are achieved with this resonant converter. First, ZVS turn on and low current turn off of MOSFETs is achieved. The switching loss is reduced so we can operate the converter at higher switching frequency. Second advantage is that with this topology, we can optimize the converter at high input voltage. And...
In this paper, a weighted tuning methods of a PID speed controller for separately excited Direct current motor is presented, based on Empirical Ziegler-Nichols tuning formula and modified Ziegler-Nichol PID tuning formula. Both these methods are compared on the basis of output response, minimum settling time, and minimum overshoot for speed demand application of DC motor. Computer simulation shows...
Wire Electric Discharge Machining (WEDM) is one of the important non-traditional machining processes for machining of intricate profiles in conductive and difficult to machine materials. The machining performance of this process largely depends on various process parameters, such as applied voltage, ignition pulse current, pulse-off time, pulse duration, serve controlled reference mean voltage, servo-speed...
This paper presents the design of Load side compensation topology of Dynamic Voltage Restorer using Z-source Inverter which is able to compensate voltage sag and swell at sensitive load terminals. Based on this topology, the DVR consists of uncontrolled rectifier for giving DC supply to Z-Source converter through DC link. Z- Source Converter based topology is proposed in order to enhance the voltage...
The credentials of fuel cell (FC) as an alternative source for electric vehicle are not encouraged by many due to its high cost and slow dynamics. Moreover, due to slow dynamics of FC dominated by temperature of fuel delivery system, fast load demand will cause a large voltage drop in a short time, which is recognized as a fuel starvation phenomenon. To overcome this problem, an energy storage system...
This paper presents the systematic procedure of the modeling and simulation of a Dynamic Voltage Restorer (DVR) for power quality problems, voltage sag and swell based on Sinusoidal Pulse Width Modulation (SPWM) technique. Power quality is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure of end use equipments. The major problems dealt here is the voltage...
This paper presents a comparative study between the classical (Hysteresis and Proportional-Integral using PWM technique) and Predictive controllers for three-phase voltage source inverter. The hysteresis controller provides excellent dynamic performance, whereas the Proportional-Integral controller provides instantaneous current control and wave shaping, fixed inverter switching frequency resulting...
This paper presents an approach for the determination of the optimal parameters and placement of UPFC as the major concern is to ensure the full potential of utilization in the transmission network. Voltage source model is utilized to study the behaviour of the UPFC in regulating the active, reactive power and voltage profile. This model is incorporated in Newton Raphson algorithm for load flow studies...
The dc link voltage of the unified power quality conditioner (UPQC) is maintained at certain preset value during the steady state. However the dc link voltage can significantly deviate from its reference during a transient event, caused by load connection/disconnection or/and supply side voltage sag/swell. During such transients, due to significant deviation in the dc link voltage, the series injected...
Forward converter is a popular switched mode power supply circuit that is used for producing isolated and controlled dc voltage from the unregulated dc input supply. This paper analyses the presence of chaos and spectrum of chaos in a forward converter. The simulations are carried out in PSPICE. The spectrum of converter during periodic operation is compared with the spectrum during chaotic operation...
A new sliding-mode controller is designed and analyzed for DC-DC converters. It incorporates the part state information feed-back and input voltage feed-forward. With the adaptive sliding surface, the controller can give satisfactory control effect under operating point changes and parameter uncertainties. One main advantage of this controller is that it is based on the large signal model of DC-DC...
The current-voltage-fed bidirectional dc-dc converter, which refers to a current-fed inverter at low voltage side and a voltage-fed inverter at high voltage side, can realize zero voltage switching (ZVS) for the switches with the use of phase-shift (PS) technology for future hybrid electric vehicle and fuel cell automotive applications will be presented in this paper. However, the current-fed switches...
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