Power Factor Correction Using Boost Converters For Single Phase Diode Bridge Rectifiers

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

Early engineers realised that higher voltage results in lower current through the power lines, resulting in lower power line losses. Today, long-haul power lines run at voltages of 300,000 volts in order to minimize the power loss. “Using transformers, it is easy to boost AC voltage to these high levels and then reduce this and reverse the process at the consumer end. DC doesn’t work in a transformer.”

Fig. 5.10. Control of the dc–dc converter to produce less power under voltage sag: (a) grid voltages, grid currents, actual duty cycle, input voltage of the dc–dc converter, estimated duty cycle; and (b) dc-link voltage.

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.

Switching power converters offer an easy way to regulate both the frequency and magnitude of the voltage and current applied to a motor shown in fig(1). As a result much higher efficiency and performance can be achieved by these motor drives with less generated noises[3].

Basic principle of this type of configuration is isolation of harmonics in between nonlinear load and source. The basic configuration is similar with shunt APF, except that interfacing inductor is replaced by an interfacing transformer, where the injection of harmonic voltage occurs. It is otherwise known as a harmonic isolator, which offers zero impedance to the fundamental and infinite impedance to the harmonic frequency components. Fig. 3.5 demonstrates the basic configuration of a series APF. Series APF is suitable for improving the quality of the distribution source

Abstract— A novel single-stage high-power factor ac to dc converter with symmetrical topology which is compared with traditional full bridge series parallel resonant converter. Traditionally, an ac/dc converter consists of a diode-bridge rectifier followed by a bulky capacitor and a high frequency dc/dc converter. This kind of converter inevitably introduces a highly distorted input current, resulting in a low power factor. Single stage ac/dc converter with symmetrical topology can overcome this

Simulation of the proposed converter & the results using MATLAB & Simulink can be seen in this

The new UK’s power supply mix may implicate new engineering challenges that we will have to face in the future. One of these

Current scenario of the globe is that sources for energy are lagging behind the current demand so most concentration is on renewables. Solar performance efficiency mainly depends on cell structure, maximum power point tracking technique and converter circuit used. MPPT operation executes a key part in raising the strength of PV system. A p & o, incremental conductance, Fuzzy based MPPT algorithmic principle is anticipated with a boost converter. Two in and single out Mamdani’s fuzzy framework with triangular membership is used to concoct the controlled current. The anticipated procedure is upheld in MALAB/SIMULINK and in this way the maximum power point tracking performance is evaluated. The anticipated system tracks the most in operation reason with no wavering and enhanced exactness. The reproduction results demonstrate the adequacy of the anticipated method.

People of the world are in need to find and develop new sources of energy to power their lives. Owing to the increasing demand for electrical energy, world’s fossil fuel supply will thus be depleted in a few decades. Hence, alternative or renewable sources of energy have to be developed to meet the future energy requirement. Grid connected wind capacity is undergoing through fastest rate of growth compared to any other form of renewable power generation, achieving global annual growth rates of 20–30 %. The power electronic converters play a major role in wind energy conversion system for controlling and conditioning of output power from wind energy. During last few years matrix converters and multi level converter topologies have generated significant interest. This paper discusses the diode clamped multilevel matrix converter design for double fed induction generator based wind energy conversion system. The MATLAB/SIMULINK software is used for analyzing the converter performance.

Abstract—Different converter topologies have been introduced for high power applications in recent years. This paper shows Permanent Magnet Synchronous Motor in Hybrid electrical vehicle is proposed by an interface of boost converter, interleaved converter and inverter as an integrated circuit. An inverter/converter circuit is designed in such a way so as to operate or control the HEV during different modes of operation. The integrated circuit in HEV will operate as a boost converter or interleaved converter depending on the load condition. The proposed integrated circuit will reduce the current ripple and voltage ripple hence it will leads to reduction in switching, conduction losses, and thermal stress on the motor. The effectiveness of proposed integrated circuit is simulated in MATLAB/ Simulink. The simulation shows that the integrated circuit have a high efficiency and can be used at high power application.

Abstract—for very high voltage gain of a Photo-Voltaic system, this paper proposed a buck-boost inverter of single stage. DCM (Discontinuous conduction mode) and MPPT (maximum power point tracking) is employed to get one power factor. Minimization of switching losses is employed with only two switches and operated at very high frequency. Easy control capability, optimum size, affordable cost with high voltage gain made the system employable. AC voltage conversion is achieved along with boosting of DC voltage of Photo-Voltaic system of inverter. Obstacle shadow variations also reduced by means of having the possibility of reduced series connected modules; this ability is due to the high voltage gain. Since the proposed design has the two buck boost converter each one operates for only one half cycle and the Discontinuous conduction mode operates at unit power factor. Simulation results assure the proposed idea of the single stage interleaved inverter for high voltage gain applications.

The converter consists of linear circuit elements L, C, R as well as non-linear circuit elements, which are power electronic switches. The converter as such is not a linear system. This metaheuristic optimized method, control the switching signals from the power electronic converter circuits such as boost converter, inverter, etc. Boost converters are a kind of high- frequency converter, which convert unregulated DC power to synchronized DC power. A PV system can produce maximum possible power if it is operated at MPP. In view of achieving this maximum PV power, an MPPT is employed between the PV panel and load. This paper provides a review and comparative study of the optimized MPPT approaches [2]. The photovoltaic module’s maximum

The ordinary low power E & I core transformer is used to get required voltage. It is basically step down transformer, which reduce the voltage from mains supply depending upon the output voltage. The rectifier sections convert AC into DC. The rectifier is designed using four 1N 4007 diode. It is a bridge type rectifier, which give full cycle conduction output. The capacitor based filter section smooth the rippled DC and make it as pure DC. The smoothing level is increased by increasing filter capacitor value. The regulator block is designed using 78 XX series.