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The increase use of renewable dc or battery as a source has further emphasized the importance in efficient design of inverter. This paper discusses a study to determine optimum operating parameters of a commonly used pwm unipolar inverter. Variations on the input voltage level and switching frequency will be investigated to see their impacts on the operation of the inverter as well as harmonics produced...
The analysis of the effect of dead time in a PWM inverter is important to realize its impact on the low frequency harmonics in the inverter and for appropriate dead time compensator design. This paper analyzes the dead-time effect in space-vector PWM (SVM) inverters considering various SVM schemes that include some non-conventional SVMs and even hybrid SVMs. Also, the effect of the current zero-crossing...
A novel single-phase inverter source based on advanced modulation wave reconstruction pulse width modulation (AMWR-PWM) technology is proposed. The causes of the harmonic production and the impact of balanced and unbalanced systems on the characteristics of the inverter source are analyzed in detail. As a result, a novel method of harmonic elimination of the PWM is presented. The novel PWM technique...
Now-a-days, photovoltaic (PV) power systems are getting more and more widespread with the increase in the energy demand and the concern for the environmental pollution around the world. Multilevel inverters (MLI) have gained much attention in the area of energy distribution and control due to its advantages in high power applications with low harmonics. Out of different structures of MLIs, Cascaded...
In this paper, The rectifier and inverter in three phase PWM drive motor system is studied. Based on Fourier Transform, Mathematical models of common mode noise source of rectifier are builded. A general modeling method for common mode noise source of inverters is presented based on the principle of the double Fourier integral. PWM carrier wave and fundamental wave function are described by two independence...
The PWM technology of multiphase inverter is one of the most important technologies in multiphase drive system. In this paper, a novel space vector PWM with low harmonic and low switching loss for five-phase inverter is proposed by applying the voltage vectors skillfully. Comparing with the traditional space vector PWM (TSVPWM), another two middle vectors is adopted to implement the SVPWM in the proposed...
This paper present three-phase four-wire active filter for power line conditioning (PLC) to improve power quality in the distribution network. The active power filter (APF) is implemented with PWM based current controlled voltage source inverter (VSI). This VSI switching signals are generated through proposed three-level hysteresis current controller (HCC) that achieves significant reduction in the...
This paper presents a generalized technique for realizing PWM patterns which provides selective harmonic elimination (SHE) for Current Source Inverters (CSI). The selective harmonic elimination method for CSI is generally based on independent chop angles between 0 and 30'. The conventional SHE method cannot handle more than a few harmonics as chop angles are always restricted to be in 0 and 30'. In...
In this paper, according to the operational principle of SVPWM, a novel over-modulation technique is proposed. By means of graphical analysis and Fourier decomposition, the accurate relationship between modulation index(MI) and auxiliary parameter mref is derived respectively under two over-modulation area. With this unified auxiliary parameter, the output voltage of three phases could increase continuously...
Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) is a well-known Switching Strategy which is applied in multilevel Inverters. The aim of this strategy is eliminating low order harmonics. Basically, harmonic equations are nonlinear and solving them is a major problem for researchers. Evolutionary Algorithms have shown an effective ability for this aim, because they find solution for all...
Multilevel inverters with various pulse width modulation strategies have established their importance in high power high performance industrial applications, as they can synthesize output waveform with improved harmonic spectrum. This paper presents the performance analysis and comparison of different PWM strategies for cascaded H-bridge three-level inverter in terms of line voltage and motor current...
This paper proposes the H-Bridge multilevel circuits with sinusoidal pulse width modulation (SPWM) and double carrier for each level with different phase shifts from 3.75°-90°. Operating principle with switching functions is analyzed from five to twenty five (odd) levels SPWM inverter and simulated to alleviate harmonic components of output voltage. By observing the THD and fundamental component of...
This paper attempts to analyze the inherent harmonics present in Sine-PWM inverter output with battery as well as rectified AC as sources. A novel technique for reducing harmonics in PWM inverter output by modifying the reference waveform is proposed, which is validated by MATLAB simulations.
Nowadays, the increase in the usage of non-linear loads especially the power electronic equipments leads to deterioration of the quality of voltage waveforms at the point of common coupling (PCC) of various consumers. Active power Filter (APF) has been used to mitigate the harmonic pollution in electrical networks. APF acts as an ideal current source and inject the compensating current into the ac...
The Multilevel inverter is emerging as a new breed of power inverter option for high power applications, Especially for FACTS controllers. This can create high voltage and reduce harmonics by its own circuit topology. The power levels of the inverter are largely restricted by carrier frequency. For air cooled design the frequency is practically limited to 3 to 5 KHz for large inverters, hence to increase...
The protection to the sensitive loads from voltage sags, swells and harmonics can be achieved using the dynamic voltage restorer (DVR) in a cost effective manner. In this paper, a new control algorithm based on unit templates and instantaneous symmetrical component theory along with complex Fourier series is used for the generation of reference voltages for a dynamic voltage restorer (DVR). These...
In this paper, a comparative analysis of the carrier based pulse width with modified zero space vector modulation or third harmonics injection used in the inverter control is presented. The placement of zero space vector components with in the carrier interval determines the harmonic performance of the modulation strategy. The space vector pulse width modulated inverter gives 15 percent more line...
In this paper, various multicarrier pulse width modulation techniques are proposed, which can minimize the total harmonic distortion and enhances the output voltages from five level inverter. Multilevel inverters are important for power electronics applications such as flexible ac transmission systems, renewable energy sources, uninterruptible power supplies and active power filters. Three methodologies...
Angular contact bearings are the most popular type of bearings used in the motorized high speed spindle. An initial preload and operating-induced load control are managed to ensure its rigidity, but the centrifugal force and temperature will rise with the rapid increase of spindle speed. Although the centrifugal force and thermo induced bearings load are applied on the spindle assembly. This paper...
This paper presents a novel synchronous reference frame (SRF) controlled five-level cascaded multilevel inverter based shunt active filter for power line conditioners (PLCs) to improve the power quality in the distribution system. The SRF based compensation is developed by sensing load currents only, which require for harmonics and reactive power compensation due to non-linear loads. The attempt is...
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