Design and Development of Multilevel Inverter for Convert Direct Current to Alternating Current Using MATLAB Simulation

This paper presented the design and development of a multilevel inverter (MLI). The demand for better electronic devices increases rapidly. The multilevel inverter (MLI) which convert direct current (DC) to alternating current (AC) are widely used in the industry. The objective of this research is to design and simulate the 3-level and 3-level NPC MLI module using PLECS software. To develop the switching technique for each level of NPC MLI, and To analyse and validate the MLI in terms of harmonic. Although there is already an inverter in the market, the researcher still pursues to improve the efficiency, total harmonic distortion (THD), and reduce the size of the MLI. An THD can be improved using the suitable modulation technique and the size of the MLI can be reduced by designing better topologies. The modular NPC is using the three-level NPC as the main module and the number of levels can be increased by adding 2 level NPC modules to the main module. The switching technique was created to control the NPC MLI for each level

Asymmetric Cascaded Multilevel Inverter with Unequal Dc Sources using SPWM and MSVPWM Topologies

This paper introduces the modeling design and simulation of seven and thirteen levels cascaded asymmetric multilevel inverter (MLI) with reduced number of switches.  MLI is the most efficient energy converters which are essentially appropriated for high power applications with decrease total harmonics distortion (THD). MLI doesn't only get high power in the output but it is also utilized in renewable energy resources such as fuel cells, wind and photovoltaic cells. This paper principally focuses on a hybrid cascaded MLI with two and three unequal dc supplies which decreases the number of semiconductor power switches. Sinusoidal PWM (SPWM) and modified space vector PWM (MSVPWM) techniques are used to improve an ac output with reduced THD. The gating pulses for seven and thirteen level hybrid cascaded converter using SPWM and MSVPWM techniques are introduced. The results of these proposed modulation strategies reduce the percentage magnitude of THD. The performance of the proposed SPWM and MSVPWM topologies are verified using seven and thirteen levels cascaded asymmetric MLI via simulink/matlab. Keywords: Sinusoidal Pulse Width Modulation (SPWM), Modified Space Vector Pulse Width Modulation (MSVPWM), Multilevel Inverter (MLI), Total Harmonics Distortion (THD)

Design and implementation of 9-Level Trinity DC Source inverter using Embedded Controller

Trinary DC source cascaded H-bridge multilevel inverter and the switching pattern scheme is used to improve the performance of Multilevel Inverter (MLI) which reduces the switching losses. The proposed MLI can synthesize high quality output voltage near to sinusoidal waves. This scheme significantly reduces the Total Harmonic Distortion (THD) and switching losses. The circuit configuration is simple and easy to control.  For the developed technique simulations are carried out through MATLAB/SIMULIN

A New Topology of Cross-Switched Multilevel Inverter

This study proposed a Multilevel Inverter (MLI) topology that generates a high number of output voltage levels with a reduced number of components. The proposed topology was configured with symmetrical, asymmetrical, and hybrid configurations. Each configuration generates a different level of output voltage. In parallel to the increased output level, the output voltage has a better output quality (i.e., a lower percentage of total harmonic distortion), simple design and less demanding operation

Single-phase seven-level stack multicell converter using level shifting SPWM technique

Abstract: This paper presents a single-phase seven-level stack multicell converter (SMC) which provides a viable solution for multilevel converter. Conventional cascaded multilevel inverter (MLI) removes the drawbacks of clamping diodes and clamping capacitors topologies. However, in a cascaded MLI number of voltage source and power switches increases as the number of level increases. The main advantage of single-phase SMC converter is only two DC sources are needed for any number of levels. Level shifting SPWM technique has been incorporated to achieve gate pulses, in which carrier wave of 20kHz is compared with 50Hz sinusoidal reference wave at a modulation index of 1 and 0.9. Total harmonic distortion (THD) for SMC converter is achieved at 1.55% and 5.26% with and without filter respectively. The seven-level SMC topology is simulated in MATLAB/SIMULINK and simulation results are provided to verify the performance

Multi Level Inverter Under Unbalanced Voltage Conditions

A Multilevel Inverter(MLI) is a power electronic device built to synthesize a desired A.C voltage from several levels of DC voltages. Generally unbalanced voltages will occur at supply side these can be eliminated by using Multi level Inverter. In this paper a closed loop Control system is designed using PI controller in order to maintain load voltage constant for under voltage and Over voltage conditions and MATLAB simulations have been carried out

REDUKSI HARMONISA MENGGUNAKAN CASCADED H-BRIDGE MULTILEVEL INVERTER (MLI) SATU FASA DENGAN TEKNIK MULTICARRIER SPWM

Gangguan harmonik keluaran tegangan listrik pada inverter dapat menyebabkan peralatan yang terhubung mengalami kerusakan. Inverter konvensional dengan topologi full bridge menggunakan filter pasif untuk mengatasi gangguan harmonik. Namun, membutuhkan nilai komponen yang cukup besar sehingga menambah biaya dan ruang pada inverter. Topologi multilevel inverter (MLI) menghasilkan keluaran yang cukup baik karena bentuk gelombang tegangan keluaran bertingkat dan dapat mendekati bentuk sinusoidal. Selain itu, dengan menggunakan topologi MLI dapat mereduksi biaya dan ruang dari komponen filter pasif. Cascaded H-Bridge MLI menawarkan kinerja yang baik dengan efesiensi daya yang baik, jumlah level tegangan dua kali dari jumlah Separate DC Source (SDCS) dan mudah untuk di desain. Teknik multicarrier SPWM digunakan sebagai pengontrol saklar daya untuk menghasilkan tegangan keluaran bertingkat. Multicarrier SPWM bekerja dengan membanding gelombang carrier bertingkat dengan sebuah gelombang sinusoidal murni. Filter LC tetap digunakan untuk membantu dalam mengatasi gangguan harmonic. Penelitian ini membuat suatu pemodelan Cascaded H-Bridge MLI dan menguji coba dengan menggunakan software MATLAB. Hasil yang diperoleh memenuhi standard persentase THD yaitu 2,09% untuk tegangan dan arus luaran

Desain Filter Aktif Dengan Skema Fuzzy Logic Controller Untuk Mereduksi Harmonisa

Harmonics are known as one of the causes of decline in the quality of the electrical power system, which can cause a negative impact on electronic equipment. Harmonics reduction that has been achieved with the passive filters is not quite satisfactory, thus development of active filters is required. This research proposes the use of parallel active filter design using a three-level inverter with the scheme of Fuzzy Logic Controller (FLC) that is used to reduce harmonics. The use of three stages Multilevel Inverter (MLI) on parallel active filter has several advantages that are lowering harmonic distortion and reducing stress switching. From the simulation results, it was obtained that three parallel active filters were capable of reducing the level of harmonic currents and voltages at the source; THDi before installation of the filter was equal to 26,16% and can be lowered to 2,42%. While THDv was reduced from 0,45% to 0,17%. Fifth-order harmonics is the most disturbing harmonic component, in which the value of IHDi beforeinstalling the filter is equal to 21,44% and reduce to 1,2% after the installation of the active filter

A Flexible Rung Ladder Structured Multilevel Inverter

The tenet of the multilevel inverter (MLI) is a peculiar kind in the voltage source inverter (VSI) family, which offers a prudent solution to prevailing issues of conventional two levels VSI, higher dv/dt and harmonic distortion, through a staircase/stepped output voltage from multiple separate dc sources (SDCs). The incessant research effort in the last four decades has bestowed a host of MLI topologies with different concepts, structures, component requirements and application appropriateness. The main issue with the MLI structures is the objectionable component count while upping the number of levels in the output staircase waveform. This paper suggests a new MLI structure, a flexible rung ladder structured multilevel inverter (FRLSMLI), with a savvy to operate both in symmetrical and asymmetrical modes involving only fewer component counts. The proposed FRLSMLI is basically a ladder structured bridge (H-bridge with additional rungs) and the rungs comprise either source inclusion-bypass cell (SIBC) or four level creator cell (FLCC). The FRLSMLI can synthesize fifteen levels with three SDCs. The simulation and experimental results are projected to validate the viability of proposed MLI in real time applications