Design and Construction of a 500 Watt Power Invereter

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. 11 shows a comparison of DPWM2O, DPWMLPF2 and GDPWMO at 0.4 modulation index. The inverter is operating with 160 Hz fundamental frequency and 7.68 kHz switching frequency. The output power factor angle is 45°. It can be seen that each strategy produces 32 pulses in one cycle. However, the clamping interval of the GDPWMO strategy is perfectly aligned with the line current peaks, whereas the DPWM2O and DPWMLPF2 strategies incurs switching instances around the current peaks.

The main objective of this report is to recommend the safe method of power generation to the community. Recommendations are based on extensive literature

The innovative inverter technology produces safe, smooth power, protecting your sensitive electronics (computers, smartphones, etc.) from damage.

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

Introduction: An inverter is a DC to AC converter, used to convert a dc input voltage into a symmetrical ac output voltage of desired magnitude and frequency. The waveshape of output ac voltage of inverter should be sinusoidal. However, practical inverters give output voltage that are non-sinusoidal and contain harmonics. The waveshapes of output voltage are square, quasi-square or distorted sinusoidal. Inverters used in low and medium power applications normally give square or quasi-square wave output. However, in high-power applications sinusoidal waveform is required, so inverters are carefully designed to give sinusoidal output with low distortion.

As the most important type of energy, invented in the 1870s, the electricity has dominated the energy world for more than one hundred year. The invention and application of electricity contributed to the second peak of industrialization, which is undoubtedly one of the three science and technology revolutions within human history since the 18th century. Subsequently, technology has changed human’s life when the large scale power system emerged in the 20th century. As one of the most remarkable achievements in the history of science and human engineering, the large scale power system consists of power generation, transmission, substation, power distribution and utilization. These individual elements are combined together to form a vast, complicated and dynamic system which is competent to generate, transmit, and distribute electricity over a large geographical area (Padiyar 2008).

The flexible AC transmission system (FACTS) concepts, based on applying state-of-the-art power electronic technology to existing AC transmission system, improve stability to achieve power transmission close to its thermal limit [4]. Such devices are installed by utilities and by many private entities in India. In order to achieve this identical goal other way is by converting existing 400kV / 765 kV double circuit HVAC line to HVDC line without any modifications in the existing tower structure, insulators and conductors considering heavy pollution as the worst case.

Keywords— Reactors for inverter; High power factor converter; Power factor improving capacitor; Transformer multi-phase operation; AC filter; Active filter

Now a day, photovoltaic (PV) energy system has attracted interest as a next generation energy source capable of solving the couple of problems caused by increasing energy consumption. Photovoltaic system avoids unnecessary fuel expenses, pollution or waste and no vibrations/ noises because the components of power

The design of the converter is to integrate renewable source such as wind system with the grid. Generally, the energy of renewable power systems is always inconstant in real life.

In recent years insufficient energy became greatest hurdle for consumers and generating station due to Scarcity of non-renewable energies, block outs in plants, improper production and supply of requirements Production and supply of energy became a challenging aspect for power Generation, distribution and transmission operators. With the considerations of above a grid connected supply which supported by a Renewable energy source –wind is used to a non-linear load. To obtain power quality here we used a AC-AC link with rectifier and 4-Leg inverter operation at a point of common coupling (PCC).

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

It is basically a two stage topology which acts as an interface between the photovoltaic system and

So harmonics directly effect the system performance. For performance improvement of an inverter it is desirable to eliminate harmonics. IEEE 519 Standard gives maximum allowable limits for voltage and current distortions [3].