Different Types of PWM Techniques for Z-Source Inverter 3.1 Introduction Generally in

The parameters of this controller (PI- 1) can be decreased during the voltage sag in order to improve the performance of the proposed method.

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

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

And are fundamental frequency positive-, negative-, and zero-sequence components, respectively, and is the harmonic component of the bus voltage. According to control objectives of the MC-UPQC, the load voltage

Boost converter is connected to a solar panel in source side which is used in order to enhance the output voltage that can be used for different applications.

The choice of right type of converters for the different requirement in specific application has great influence on the optimum performance of the photovoltaic system. In last two decades, enormous developments have been taken place in the area of solar PV power generation. A large number of research publications in these areas have led to this persuasion of a critical review of the available literature. In particular, many inverter topologies have been introduced to incorporate several unique features, such as a) intrinsic boost capabilities, b) isolation, c) high efficiency, d) good power decoupling, e) dual grounding function, f) single stage solar power conversion capabilities, g) compact design and h) good power quality, for both

Brushless DC (BLDC) motors are used for many low and medium power drives applications due to their high efficiency, high flux density per unit volume, low maintenance requirement, low EMI problems, high ruggedness and a range of speed control. The commutation in PMBLDCM is accomplished by solid state switches of a three phase voltage source inverter (VSI). There is a necessity of an improved power quality (PQ) as per the

Pulse width modulation technique based cascaded multilevel inverters have been receiving increasing research attention in the past few years. These power converters provide advantages of high power quality waveforms, low switching losses, and high-voltage capability. It has led to many applications such as high-power motor drive, variable speed drive, Uninterruptible Power Supply and active power line conditioners. The various topological structures of the multilevel inverter suggestions

The purposeof this project is to design a control strategy for a voltage sourced inverter (VSI) that will facilitate the inversion of DC power source, supplied by Photovoltaic (PV) cells, to an AC power source which can be used either to supply load or to connect directly with utility grid. The system will be controlled to obtain maximum active power and maintain unity power factor for the grid-connected solar system.

Keywords: — Mathematical model of photovoltaic cell; photovoltaic module; array; boost converter; mppt algorithm; pwm; single phase inverter; three phase inverter; MATLAB/simulink; gate pulse using 555 timer; voltage doubler circuit in hardware.

L. Hsiu et al. [34] at low output ripple and noise in voltage and current and for this design a model of coupled inductor and transformers on a common core is use that provide Zero-voltage– switched Dual–SEPIC converter with coupled inductor. H. F. Bilgin et al. [35] gave a design criteria, operating feature and characteristic of the buck type PWM rectifier employed in a unity PF dc motor drive. As per this paper single–stage UPF buck –type PWM uses For-low harmonic distortion in Ac supply current and nearly UPF over a wide operating shaft speed Range. And these output voltage and current in limit avoid any type of failure risk in current connection even for oldest motor design, aging in insulation, mechanical failure due to circulation

In this project firstly it is giving the supply to PIC16F8774 microcontroller. Then controller generates the pulse generally 5VDC.The generated pulse is nothing but PWM signal, which is given to the driver circuit. The function of this driver circuit is to generate 12V DC pulse. These applications may demand high-speed control accuracy and good dynamic responses.

So that the voltage and current is of poor qualities and the switching frequency causes more amount of switching losses. Those drawbacks are rectified using three phase neutral point clamped multilevel inverter. The voltage and current quality are better and the switching losses are reduced when compared to the conventional technique. Also the THD is found to be better.

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.