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Multi-level voltage source inverters offer several advantages such as a better output voltage with reduced total harmonic distortion (THD), reduction of voltage ratings of the power semiconductor switching devices and also the reduced electro-magnetic interference problems etc. This paper presents the application of simplified space vector modulation (SVM) method for three-level, five-level and seven-level...
This paper aim to implement an off-grid photovoltaic system for electrifications purposes to an existing bus stop at Melaka, Malaysia. A calculation has been carried out to determine the system size and design, hence also for improving the system design. The system will consists of solar PV panels along with batteries as energy storage, 500 Watt low power inverter and the small design with a load...
In this paper, a novel hysteresis current control method based on the phase of the output of voltage loop by using a single LEM current sensor is proposed. Because of having two filter inductors, the Dual Buck Half Bridge Inverter has on bridge arm shoot-through problem. Each inductor current can be independently controlled, so the power switches and the free wheeling diodes can be optimally chosen,...
A new inverter topology for Adaptive photovoltaic (PV) system is proposed. An improvement in the power generation of the system during different operating conditions is achieved. The proposed configuration provides flexible connection between the PV modules and the inverters to meet current conditions of PV array. Preliminary simulation results are provided for an adaptive PV array. Efficiency comparison...
PV inverters are an important element of the future smart grids. Not only they contribute to the active power generation as distributed generators (DGs), but also they can help grid voltage/frequency stability by generating VAR. Although the number of PV installations is rapidly growing, the effective utilization of PV inverters remains low. As even if inverters are to operate in VAR mode during night...
This paper focuses on how to ensure high reliability and long service life of photovoltaic (PV) inverters in the design phase. First, a standard usage model of inverters is proposed based on the study of the application environment in U.S.A. Then, the main failure mode, stress level, and useful life of critical components in inverters are analyzed. Finally, a proactive maintenance plan for long-term...
This paper presents a three-phase, five-level cascaded multilevel voltage source inverter based active filter for power line conditioning to improve power quality in the distribution network. The active filter compensates both reactive power and harmonic currents drawn by non-linear loads; additionally it facilitates power factor corrections. The compensation process is based on concept of p-q theory...
This paper presents a new generation of series power quality compensators, which is called Doubled Inverter Series Compensator (DISC). The proposed DISC pursues the global objective of fully mitigating utility side disturbances from the load point of view through application of two series inverters. Either inverter is of a predefined function in a predefined duty cycle. Technical considerations have...
This paper focuses on the frequency-down-conversion realized with a proposed Mixer topology using 4 CMOS inverters only. From simulation and using typical 0.35μm CMOS process parameters, the proposed Mixer exhibits at 900MHz under 2.5 supply voltage, the following performances: a 16.8dB conversion gain, a 23dBc-IM3 with 200mVpeak-to-peak input sinusoidal waves. The corresponding IIP3 is 10dBm for...
Surface permanent magnet (SPM) machines operate with maximum output power for a given current when the induced voltage and the current are in phase. For an SPM generator this is obtained with a leading power-factor load. The inverter topology can achieve a leading input power-factor but this generally requires rotor position information. A lower-cost approach is to use a switched-mode rectifier (SMR)...
Direct Torque Control is a control technique used in AC drive systems to obtain high performance torque control. The conventional DTC drive contains a pair of hysteresis comparators, a flux and torque estimator and a voltage vector selection table. The torque and flux are controlled simultaneously by applying suitable voltage vectors, and by limiting these quantities within their hysteresis bands,...
The paper present a MATLAB-SIMULINK model of a single phase 1.5 KVA RMS controlled VSI inverter using MOSFET. The paper describes the behavior of output voltage and current, the total harmonic distortion (THD), with the variation in input dc capacitor (Cdc), Snubber capacitor (Cs) and Snubber resistance (Rs) for linear and non-linear load. The values of Cdc, Rs and Cs as suggested by other authors...
In most of the situations, power electronics converters are mainly used as an interfacing device between distributed generation (DG) system and utility grid in order to meet the following objectives: 1) grid synchronization 2) active and reactive power control through voltage and frequency control 3) improvement of power quality (i.e. harmonic elimination) etc. But due to wide variation of the reactive...
This paper investigates the capacitor voltage balance scheme for a neutral point clamped inverter. A symmetrical space vector modulation is used to analyze the imbalance in neutral point voltage. This method overcomes the drawbacks of Nearest Three Vector modulation method. The redundancies of different switch configurations for the generation of the same output voltage are used to limit the voltage...
This paper presents photovoltaic (PV) grid-connected power conditioning systems based on Z-source inverter. Using Z-source network, the system can work within a range of PV array output voltage wider than that of the conventional boost converter. It allows the use of the shoot-through switching state for boosting the input voltage, compensates dead-time effect which causes serious output voltage distortions...
Vehicle-to-grid (V2G) or G2V systems essentially require an interface between the electric vehicle (EV) and the grid to facilitate the V2G concept. This paper presents a wireless power interface for the grid integration of EVs. The proposed bi-directional wireless power interface is based on the Inductive Power Transfer (IPT) Technology, and comprises a high frequency IPT system and a low frequency...
This paper presents a new direct integration scheme for supercapacitors that are used to mitigate short term power fluctuations in wind power systems. The proposed scheme uses the popular dual inverter topology for grid connection as well as interfacing a supercapacitor bank. The dual inverter system is formed by cascading two 2-level inverters named as the “main inverter” and the “auxiliary inverter”...
Simulation model of inverter is established in MATLAB/SIMULINK on the basis of the given concepts of system, simulation and models in this paper. We studied the output harmonic characteristics of the inverter, analyzed the influence on output waveform caused by different carrier ratio and modulation depth. The results of simulation show that SPWM (sine pulse width modulation) can effectively suppress...
This paper presents the concept of using a new tapped-inductor (TL) Z-source impedance network for implementing Z-source inverters. By replacing the original two inductors found in the classical impedance network with two modified 2-terminal TL cells, output voltage range of the new inverter can widely be expanded. This means a larger gain, which in principle, can be adjusted freely by varying the...
In this paper, we study the effect of the variation of process parameters on the performance of a voltage controlled oscillator (VCO) and an inverter with technology scaling. The spread in performances is shown to be Gaussian in nature, considering the fact that the distributions of process parameters are also Gaussian in nature. The spreads in performances increase with technology scaling. These...
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