Advantages And Disadvantages Of Voltage-Source Inverter

was derived and a relationship between Vinv and Vc was obtained (see Fig. 2). Applying voltage balance

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. 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.

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].

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.

where R_s is the stator resistance, i_s is the stator current, λ_s is the complex conjugate of the stator flux linkage phase, and ω_s is the stator frequency.

AC electrical energy in grid interactive PV system. To achieve direct medium-voltage which is present at grid without using bulky medium-voltage transformer ,cascaded multilevel converters are attracting more and

Power electronic circuits that convert a dc voltage to difference dc voltage level are known as the DC-DC converters. It uses semiconductor devices to perform its operations by controlling or modifying a voltage current. There are different types of conversion method such as electronic, linear, switched-mode, and so on. Whenever we want to change DC electrical power from one level to another level, switched-mode DC-DC converter has been chosen because is much efficient due to the reduced losses in the electronic switch. Switched-mode DC-DC converters is also known as switching power supplies or switchers.

In recent years, conversion of ac line voltages from utilities has been dominated by using a single-phase diode rectifier followed by a single switch boost stage. Designers have embraced the usefulness of this topology since it draws a sinusoidal input current and maintains a unity input power factor under varying load

This paper deals with a Cuk Topology for Power Factor Correction (PFC). Most of the front-end PFC converters are designed using diode bridge and has lower efficiency due to losses with reduced power factor.The current flow, during each intervals of the switching cycle reduces the conduction losses compared to the conventional Cuk PFC Rectifier. The converter also provides protection against inrush current occurring at start-up, decreases input current ripple and reduces Electromagnetic Interference (EMI).It works in the Discontinuous Conduction Mode (DCM) to provide almost unity power factor and low distortions in the input current. To analyse the performance of this converter, a model based on the CUK topology has been designed by using MATLAB/ SIMULINK software and implemented with Proportional-Integral (PI) and Fuzzy logic controller.

PWM inverters are used for a wide range of applications such as: Adjustable Speed Drives (ASD), Power Filters (PF), Dynamic Voltage Restorers (DVR), Uninterruptable Power Supplies (UPS) and Distribution Static Compensators

This project is aim to study the principle of pwm, single-phase inverter, three-phase inverter which leading to design a three-phase inverter(DC-AC) by using the mbed to control switch. This inverter will be intended to drive an induction motor which may need to drive. The work will involve simulation study of PWM generators, induction motors and device selected from.

Generally in traditional inverter there are various conventional PWM techniques like Sine triangle PWM, Space Vector PWM techniques. Likewise in Z-source inverter there are three types of conventional PWM techniques used to control Z-source inverter. These techniques are Simple Boost Control (SBC), Maximum Boost Control (MBC), Constant Boost Control (CBC).The detailed description of all the three methods is discussed below.

Power electronic converters, especially DC/AC inverters have been extending their range of use in industrial application because they provide better system efficiency, reduced energy consumption and improved quality of power. The output voltage of inverter could be fixed or variable at a fixed or variable frequency and output waveforms are therefore made up of discrete values, producing fast transition

Table 3.4 lights the need of number of main switches and main diodes in inverter to achieve voltage levels. Implicitly, the multilevel