Application Of A Cuk Topology For Power Factor Correction ( Pfc )

It is observed that the power factor is maintained closer to unity when the input voltage is reduced from 230V to 110Vrms. Figure 11 (a) and (b) shows the power factor correction of controller for various load condition such as 20% (60W) and 75% (230W). The power factor for the system is found to be 0.84 for light load condition and 0.99 for full load condition. The THD of input current at full load with predominant third and fifth harmonic components are shown in Figure 12(a) and (b).Third harmonics is found to be 4.8% and fifth harmonic component is 4.9% which are well within IEC 61000-3-2 standard during wide range of load variations. The variation in power factor with load is shown graphically in Figure 13(a). It can be inferred from the graph that improved resettable control operates at high power factor for all load condition whereas the conventional PI control has poor power factor under light load conditions. Figure 13(b) shows the comparison between the efficiency of the converter for varying load conditions with the conventional control method and the resettable integrator control. The converter’s efficiency is maintained at 92% for light load conditions and 96% for fully loaded condition with integrator control technique. Thus the improved resettable integrator controller provides a very simple and reliable solution for power factor correction and

Fig. 12 shows the switching loss reduction using the DPWM2O, DPWMLPF2 and GDPWMO sequences in comparison to the conventional SVPWM strategy for 30°-60° power factor angle range. It can be seen that the DPWM2O and DPWMLPF2 sequences provide maximum switching loss reduction only at 30° and 60°, respectively. In other power factors, their loss reduction capability reduces. On the other hand, the GDPWMO strategy reduces switching losses around 50% over the entire range of power factor angle, similar to the analytical results shown in Fig.

Using Field Oriented Control, current control is largely unaffected by speed of rotation of the motor[6].In the scheme of filed oriented control motor currents and voltages obtained from the motor are transformed into d-q reference frame. Measured currents from three stator phases these currents which are now in the stator reference frame are converted into two phase using Clarke transformations which are further converted into the corresponding rotor reference frame using Park transformation. The resultant current obtained is dc which is easier for the PI controllers to operate.

In [34] authors has designed a new types of transformer less three-phase three-level NPC based power converter which performance has been analyzed in 2.64–4.16 kV DC, 5.1–12.8 kW. It’s performance like DC link voltage, efficiency & THD profile was acceptable. The authors assumed that this converter will be suitable for 15kV grid voltage. Converter switching circuit has been designed in SiC (Silicon Carbide) IGBT & Diodes as shown in Fig.18. So, this converter can be re-designed for medium or high voltage with SiC

Now a days, the switching power supply market is flourishing quickly. The trend is for DC-AC converters with low cost, higher efficiency, power saving that enable maximum features. In this project, a single-stage three-switch buck-boost inverter is designed, where stepping up, stepping down and inversion operation will takes place in single stage. This proposed inverter will overcome all the drawbacks of traditional one. Coupled inductor plays a very important role in energy transfer and eliminates the use of line frequency transformer. As the inverter having only three switches, the controlling of switches also easier than conventional one. And it has also advantages like compact design, reduced switching losses, component size, and cost.

Abstract: Nowadays an Inverter is most commonly used device in almost every field. An inverter gives ac square wave output. The objective of this paper is to obtain a three-phase ac voltage output of 3-phase inverter in Simulation. An inverter receives dc supply as input and generates an ac output. The dc input of 3-phase inverter is obtained by constant dc source. The inverter circuit consists of six IGBTs which are used for conversion of dc to ac supply. Simulation of 3-phase inverter is done in MATLAB software.

reducing the output ripple current and the total harmonic distortion of the output current, increasing the power density of system, and reducing the current stress and thermal stress of power devices. Besides, it can solve the problem of zero sequence circulation current (ZSCC) in interleaved inverter system by the circuit structure, and it also has the advantages of no shoot-through problem, no reverse recovery of the body diode, and three-level output. The interleaved inverter circuits share two power-frequency switches, which are resized for each specific application, and it is easier to extend the system by improving current capability of the two switches. The working principle of this system is introduced in detail and a 2 kW experimental prototype has been established and tested. Test results verify the principle and

This chapter deals with the classification and basic operation of electric variable speed drive system and scope, merits and demerits of DC and AC drives. Then AC induction motor drive is selected for complete description. Here AC drive system is presented with its components like inverters, position sensors and current controller.

BLDC motors are a type of synchronous motor. This means the magnetic field generated by the stator and the magnetic field generated by the rotor rotate at the same frequency. BLDC motors do not experience the “slip” that is normally seen in induction motors. BLDC motors come in single-phase, 2-phase and 3-phase configurations. Corresponding to its type, the stator has the same number of windings. Out of these, 3-phase motors are the most popular and widely used. Brushless Direct Current (BLDC) motors are one of the motor types rapidly gaining popularity. BLDC motors are used in industries such as Appliances, Automotive, Aerospace, Consumer, Medical, Industrial Automation Equipment and Instrumentation. As the name implies, BLDC motors do not use brushes for commutation; instead, they are electronically commutated.

Brushless DC motors is a permanent magnet synchronous motor which operate by dc current, as the name behold the brushes are not exist here, they have been replaced by electronic commutation system. In contrast to brushed motor, permanent magnet brushless dc motor (PMBDCM) operates by means of an electronic six-step commutation system and its doesn’t contain any carbon brushes.

Abstract— this paper presents a brief overview of standards for power electronics. All the standards presented in this paper are currently active and are approved by the Institute of Electrical and Electronics Engineer Standards Association (IEEE-SA) and American National Standards Institute (ANSI).

Bose, B. K. (2006): Power Electronics and Motor Drives: Advances and Trends. Amsterdam: AcademicBose, Bimal K. (2011). (PDF). Doha,Qatar. p. 12.Retrieved Feb 8, 2012.

Abstract— Conventional three-level discontinuous pulse-width modulation (DPWM) techniques are typically employed in variable frequency drive applications to reduce inverter switching losses and provide maximum benefit for load power factor angles in the range from 30° lagging to 30° leading. This paper proposes a series of DPWM templates for lower power factors and a generalized DPWM strategy for three-level T-NPC inverters operating with modulation indices lower than 0.5. With a change in the power factor, the proposed strategy adapts the inverter pulse sequence by combining different portions of the proposed DPWM templates within one fundamental cycle and ensures minimum switching instances during transitions. Consequently, the strategy perfectly aligns the no-switching durations of the inverter pulse-patterns with the respective load-current peaks, achieving a 50% switching loss reduction for all operating power factor angles (90° lagging to 90° leading) at modulation indices lower than 0.5. The paper provides an analytical evaluation of the proposed strategy on the three-level T-NPC inverter switching losses. The simulation and experimental results demonstrate the effectiveness of the proposed three-level generalized

ABSTRACT: This Project deals with a fully parallel Embedded Z-source inverter to control the three phase induction motor. Z-Source inverter is a single-stage converter which performs both buck-boost energy conversions using the LC impedance network. The further advancement in the Z-Source inverter is the partially parallel Embedded Z-Source inverter that can produce same gain as Z-Source inverter. Energy from the solar cell is taken as input to the EZ-source inverter. The ripple content of the solar cell output voltage is reduced using Parallel EZ-Source (PEZS) inverter. In order to overcome the drawbacks of PPEZS, Fully parallel EZ-(FPEZS) Source inverter is proposed. The proposed inverters provide high boost voltage inversion ability, a lower voltage stress across the active switching devices, a continuous input current and a reduced voltage stress on the capacitors. In addition, they can suppress the startup inrush current, which otherwise might destroy the devices. The proposed system reduces six switch three phase inverter to four switch three phase inverter. This makes system compact which reduces cost and switching losses, line harmonics, improves power factor, reliability

Abstract—In this paper, A bidirectional full-connected dc–dc converter with a change proportion around nine times, delicate start-up, and delicate exchanging elements for PMDC motor drive is proposed in this paper. The converter is furnished with a dynamic flyback and two inactive capacitor–diode snubbers, which can diminish voltage and current spikes and lessen voltage and current burdens, while it can accomplish almost zero-voltage-exchanging and zero-present exchanging delicate exchanging element. Simulation results are presented using MATLAB/ SIMULINK software.