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This paper proposes a method to vary the switching frequency within a fundamental cycle to reduce the switching losses of a two-level inverter while maintaining the peak–peak current ripple within a predefined limit. Unlike conventional strategies, the proposed technique utilizes precomputed switching frequency variation factors without relying on prediction or optimization techniques, since the peak–peak...
A conventional 3-level PWM Inverter and a Cascaded Multilevel Inverter, both rated at 230Vrms voltage output and 3KW are analysed using the Switching Function. The PWM signal for the 3-level inverter is derived by applying the Switching Function Technique to the equal area principle. For the Cascaded Multilevel Inverter the Switching Function Technique is initially applied to each H-bridge, and then...
The ordinary Voltage source inverter (VSI) has two output levels +VDC/2 and -VDC/2. For medium and high power applications, multi-stage VSI (series and/or parallel combinations) with suitable filter (for obtaining near sinusoidal waveform at the output) may be a solution but there are problems in matching of different stages, selection of bulky transformer and proper filter. The quality of both the...
This paper presents mainly on the basis of open loop L-Z source inverter. By using the power electronics converter the distributed generating system is connected to the grid. In that by adding inductance and diode to the input side of power electronic converter the input voltage to be boosted and eliminates the ripples in the input current and reduce the inrush current. In the distributed generating...
In this paper, a single phase effective closed loop control for solar inverter is proposed. As solar irradiance level changes with atmospheric conditions, output of the inverter varies. To maintain the output voltage of the inverter constant a close loop is implemented using PWM technique. A PWM signal is generated by comparing the output of PI controller with two identical triangular signals having...
Multilevel Inverter is widely used for high power applications and also for those applications where high voltage is required. Their performance is better than conventional two- level inverters because harmonics are less. The major problems associated with multilevel inverters are the harmonic content present at the output of the inverter and the requirements of large number of switches, which will...
In last two decays increasing demand of connecting natural sources of energy to the power grid, applications of Multilevel inverters (MLI's) have been increased for medium and high power DC to AC conversion. The component count always a challenge with increase in number of levels. This paper presents a MLI topology with less number of switches for generation of high level AC output voltage. This topology...
Multilevel inverters has acquire a great attention of modern power electronic systems. It offers less distortion and electro-magnetic interference and hence, it can be used in medium voltage and high power applications. The aim of this research article is to propose a new asymmetric type multilevel inverter with minimum number of power switches. The proposed inverter produces 7-level voltage waveform...
Many new cascaded multilevel inverter (MLI) topologies have recently been proposed and published in the literature. All proposed topologies demand significant amount of semiconductor components and input dc supplies, which is considered the main drawback for the implementation of three phase cascaded MLIs. This paper proposes a new generalized concept that could be employed within any existing cascaded...
Random Pulse Position Pulse Width Modulation (RPPPWM) scheme can achieve the distributed harmonic spectrum of both voltage and current. This results in reduction of acoustic noise and mechanical vibrations. The gate signals are generated by comparing sine wave and pseudorandom bits (PRBS). The PRBS random bit generator is implemented using a shift register. In this paper, an induction motor driven...
A total harmonic distortion (THD) optimization based 5-level selective harmonic elimination pulse width modulated (SHE-PWM) single-phase reduced device count (RDC) voltage source inverter (VSI) is presented in this paper. A MATLAB program is developed for offline calculation of switching angles based on quarter wave (QW) symmetry of the output and overall THD optimization method of SHE-PWM. The inverter...
In this study, a modified carrier is proposed to generate PWM gating signal. Proposed PWM method reduces total harmonic distortion (THD) of the output voltage of inverter up to 5.8% than the traditional triangular carrier based PWM. Major harmonic components in output voltage are less in magnitude when proposed PWM technique is applied to inverter. Fundamental component of output voltage is also higher...
In this paper, a high frequency linked cascaded multilevel inverter (CMLI) is presented, which brings simplicity for CMLI to connect in renewable systems and electronic vehicular applications. The requirement of multiple isolated dc-supplies and their balancing is a critical drawback in CMLI and for this reason; it is very difficult to connect a CMLI directly with any system. The utilization of multi-winding...
Multilevel inverter (MLI) an alternative for high voltage and high power application. It has squat switching stress on power switches, lower total harmonic distortion (THD), higher efficiency and low Electromagnetic Interference (EMI). Higher number of power electronic switches contributes complexity of control and high rate. This paper proposed a five-level inverter with reduced switch count and...
This paper proposed a Single-Phase 13-level inverter with voltage control method using semiconductor power devices for photovoltaic systems. The multilevel voltage source inverters unique configuration allows them to make high voltages with low harmonics without use of transformers or series associated synchronized switching devices. The general role of the multilevel inverter is to synthesize a desired...
Carrier-based methods have been used widely for switching of multilevel inverters due to their simplicity, flexibility and reduced computational requirements compared to space vector modulation (SVM). This paper focuses on Multicarrier Sinusoidal Pulse Width Modulation (MCSPWM) strategy for the three phase Five-Level Flying Capacitor Inverter (5LFCI). The inverter is simulated for Induction Motor...
This paper presents a comparative study of conventional and improved incremental conductance (IC) algorithm. In this study the performance of PV system is investigated by using the existing and proposed IC algorithm. The output voltage and the power is calculated in both the cases, these algorithms are implemented to drive the semiconductor switch of the boost converter further for the boost converter...
Diode and thyristor based solid state converters are preferred because of their high reliability in applications for bulk power conversion. These converters generally use Power diodes or SCR (silicon controlled rectifiers) which has non-linear characteristics. Due to this reason such converters generate highly non-sinusoidal currents at the power supply utility. As a result of distorted currents the...
In this paper cascaded h-Bridge multilevel inverter with SPWM technique is presented. Multilevel inverter have high power application & low harmonics due to these applications it is used widely in the area of control and energy distribution. This paper includes performance of 3-Level, 5-Level & 7-Level cascaded H-Bridge multilevel inverter with respect to number of switches, total harmonic...
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