Advantages And Disadvantages Of A Boost Transverter

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].

The multiphase buck converter is a circuit topology where fundamental buck converter circuits are put in parallel between the information and load. Each of the n "phases" is turned on at equally spaced intervals over the switching period. This circuit is typically used with the synchronous buck topology, described above.

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— The Z-Source Inverter (ZSI) overcomes the disadvantages of the traditional Voltage-Source Inverter (VSI) and Current-Source Inverter (CSI), it can buck and boost its output voltage by utilizing the shoot-through state which is forbidden in traditional VSI. Different PWM techniques are available for the control of Z-Source Inverters. In the traditional PWM technique equal shoot-through time interval is considered for the three phase legs. Hence, the realization of the shoot-through state is easy, but the main drawback of this modulation method is big inductor ripple and a large inductor when the output frequency is low. In this paper, a novel Space Vector Pulse Width Modulation (SVPWM) technique to reduce the inductor current ripple

The other converter used is a voltage-fed type Active filter structure, as shown in Fig 2.2. It is having a self-supporting dc voltage bus with a large dc capacitor. It has become very much dominant, since it is lighter, cheaper, and expandable to multilevel and multistep modes, with lower switching frequencies to improve the performance . It is more popular in UPS-based applications, because in the presence of mains, the same Inverter bridge can be used as an Active Filter to eliminate harmonics of critical nonlinear loads.

Power electronics circuits convert electric power from one form to other using electronic devices. By using semiconductor devices as switches power electronics circuits function, thereby controlling or modifying a voltage or current.Power electronics application range from high-power conversion equipment such as dc power transmission to everyday appliances, such as cell phone chargers, cordless screwdrivers, power supplies for computers, and hybrid automobiles. Power electronics includes applications in which circuits process miliwatts or megawatts.Power electronics include conversion of an unregulated dc voltage to a regulated dc voltage conversion of ac to dc, conversion of dc to ac, and conversion of an ac power source from one amplitude and frequency to another amplitude and frequency. These power converters are classified as rectifiers, AC voltage controllers, DC choppers and inverters, which covers wide area of residential, commercial and industrial applications, including computers, transportation and power utilizes [1].

This paper proposes a new solar power generation system, which is composed of a dc/dc power converter and a new seven-level inverter. The dc/dc power converter integrates a dc–dc boost converter and a transformer to convert the output voltage of the solar cell array into two independent voltage sources with multiple

For the systems where high switching efficiency is needed, it is required and desirable to keep switching frequency much lower. In this state,

In general, solar PV module voltage is low, ranging from 30-60V DC. To meet the demand of AC loads, there is a need for inversion as well as a voltage boosting, whereas voltage boosting is dependent on parameters like module voltage, the number of modules, and their connection [7-9]. Thus, it is clear that PCS must have following functionalities, such as voltage boosting (optional), MPPT Tracking and inversion. The voltage boosting stage can be provided by either step-up dc-dc converter or transformer followed by an inverter [10-13]. But placing the transformer to raise the voltage level is not a good solution as it increases the cost, size, and volume of the overall system. Moreover, it lowers the efficiency of the system. Hence transformerless topologies received lot of attention in past few years [9]. Two types of transformerless solutions are suggested in the literature for solar PV power generations, namely a) multi-stage power conversion and b) single stage power conversion [23-24]. Whether it is single stage or multiple stage power conversion the most critical part of a solar PV system is the inverter, which will be discussed in next sections. At present, inverters are the essential cause of breakdown of huge scale PV systems [12]. Moreover, in addition to the quality problems, inverters give restricted power efficiency [7]. Normally, inverter efficiency is around 94% and as the load diminishes the efficiency can

Recently, the technological advancements in power electronics and semiconductor technologies have led to improvements in power electronic systems. The purpose of this project is to design a Boost Converter which is a DC-to-DC power converter with an output voltage exceeding than its input voltage. Boost converter is applied in many applications that require higher DC voltages for superior performance as this helps in reducing the size of the systems because the battery powered systems generally stack cells to attain higher voltage leading to larger size of the system.

An inverter is basically a device that converts electrical energy of DC form into that of AC. The Purpose of DC-AC inverter is to take DC power from a battery source and converts it to AC. For example the household inverter receives DC supply from 12V or 24V battery and then inverter converts it to 240V AC with a desirable frequency of 50Hz or 60Hz. These DC-AC

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.

The conventional two levels Inverter have many limitations for high voltage and high power application. Multilevel inverter becomes very popular for high voltage and high power application. The multilevel inverter is started with the three level converters. The elementary concept of a multilevel converter to achieve higher power to use a series of power semiconductor switches with several lower voltage dc source to perform the power conversion by synthesizing a staircase voltage waveform. However, the output voltage is smoother with a three level converter, in which the output voltage has three possible values. This results in smaller harmonics, but on the other hand it has more components and is more complex to control. In this paper, study of different three level inverter topologies and SPWM technique is explain and SPWM technique has been applied to formulate the switching pattern for three level and five level H-Bridge inverter that minimize the harmonic distortion at the inverter output. This paper deals with comparison of simulation results of three levels and five

This project has been carried out at the department of the electrical engineering at S.V.I.T. Vasad. It has been great opportunity to work with this project and get knowledge about this area of the power electronics.