Objectages And Disadvantages Of High Step-Up Converter

The simulation study of the complete system is carried out by using MATLAB/SIMULINK. For this simulation, four PV module in a series connection mode is considered. Each PV module consists of three submodules. A multiwinding flyback converter is connected across each PV module. Fig. 7(a) shows the P-V charactristc cunve of the PV array (with bypass diode) without using the integrated converter. The figure shows multiple power peaks with maximum power nearly 500W. The shading pattern of the PV array is presented in Table-1. Fig. 7(b) shows the characteristic curve by integrating the converter across each PV module. The P-V characteristic curve exhibits a single peak point. The peak power is nearly 670W. As compared to conventional PV system more than 150W power can be extracted from the PV system. Each submodule of the PV module is subjected different solar insolation. Fig. 8(a ) shows the current of submodule of PV module-1. In this figure, submodule-3 generates less power as

Efficiency increases due to low energy consumption 3. It provide battery backup for about one hour 7.2 Application 1. To reduce cost, size and weight of a power supply 2. CCTV cameras, TV’s, monitor, PC’s, laptop and camcorder power packs, printers, fax machine, VCRs, portable CD players, microelectronics based devices in automotive, computing, communication, consumer electronics and industrial applications use SMPS. Controllable output power analysis of SMPS using PWM technique for DC appliances Sigma, Matar Page XXXVII CHAPTER 8 CONCLUSION Controllable output power analysis of SMPS using PWM technique for DC appliances Sigma, Matar Page XXXVIII  Suitable components were selected and tested for desired performance.

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.

Commonly, renewable energy is defined as energy which is able to be captured from existing natural resources that are replenished rapidly, such as flowing water, sunshine, wind, geothermal heat flows and ocean [2]. Renewable energy technologies are required to provide technologies to use one or several renewable energy resources. There are some different types of renewable energy technologies, which include solar energy, bioenergy, hydropower, wind energy, geothermal energy and tidal energy. This thesis project will focus on the solar photovoltaic which is currently one of types of solar energy technologies, and this technology using photovoltaic cells to converts sunlight directly into electricity.Solar photovoltaic system can generate electricity from sunlight through using PV modules, and the system can be integrated into building designs, installed on rooftops, or large scale power plant. With the development of photovoltaic technologies, solar photovoltaic capacity has been increased from 3.7 GW (2004) to 177GW (2014) [3]. Figure 2 shows this change from 2004 to 2014, there is a big trend of increase in these years. The increase of PV capacity can reduce the carbon emission and provides more job opportunities. It also helps to reduce air pollution and make a friendly environment for living. One of the common PV system is

Prices in these contracts are either fixed, or may vary with the price level of raw materials

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].

Zhou,Z.H.,Tolbert,D.B.Toso,R.Thomas,B.J.Schwartz,Y.Rubin,N.S.Knutson,D.Kilbride,B.C.Huber,A.S.Ferrreira,L.S.Devi,J.R, Challa.Solar Power EnergySLAC National Accelerator Laboratory, “New design could dramatically boost efficiency of low cost-solar panels” Science Daily, Print. July 2015. Web.  .

Traditional power plants must be large in order to gain efficiency, but fuel cells can achieve higher efficiencies at any scale, making them perfect for small portable, residential, and transportation uses.

As the population is constantly increasing the demand for energy is skyrocketing, resources are diminishing, and pollution is intensifying. Embracing a renewable energy system is essential. Homeowners can embrace a on the grid solar photovoltaic system that will diminish the environmental footprint, and decrease the waste of energy. There are some obstacles to become energy independent, however the payoff will benefit in preserving the environment, societies, and future generations

Another advantage of the synchronous converter is that it is bi-directional, which lends itself to applications requiring regenerative braking. When power is transferred in the "reverse" direction, it acts much like a boost converter.

The objective of the control circuit for PFC converter are a near unity power factor should flow and a steady average voltage should maintain at the output. Literature is abounded with novel PFC control methods that address these objectives. These control methods can segmented into a few categories in terms of their implementation approach and structures. Such as the multi-loop multiplier approach, the cycle-by-cycle integration approach, the single-loop control approach and the sliding mode control approach. Under these categories, some common PFC converter control methods are discussed and their advantages and disadvantages of those methods [].

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.

medium voltage, high-power applications (e.g. industrial drives, and photovoltaic systems) three-level inverters are used extensively [1, 2]. Recently, the application of these threelevel inverters in low-voltage, high-power traction applications have also been introduced [3, 4]. Amongst different variants of three-level inverter topologies [5], the T-type Neutral-Point- Clamped (T-NPC) inverter, as shown in Fig. 1, has been shown to be the most promising solution for low-voltage, high-power traction applications [4]. Each phase-leg of this topology consists of two devices connected to the neutral-point of the DC-link (inner devices) and two devices placed similar to a conventional two-level inverter (outer devices).

Abstract: The current energy situation with fossil fuels as the main source of the world’s energy has two main flaws: fossil fuels contribute to global warming via the greenhouse effect and they are limited in the quantity that remains. Solar power solves both of these problems and can be captured by utilizing photovoltaic cells. However, photovoltaic cells have their own drawbacks due to their high costs of installation and maintenance.