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In this paper, a new 11-level topology of symmetrical Multilevel Inverters (MLIs) is proposed. The proposed topology offers reduced number of components as compared with conventional and recently published topologies. The Selective Harmonic Elimination (SHE) is adapted for switching modulation that removes undesired harmonics. A comparative analysis of proposed topology with other proposed topologies...
The purpose of this paper is to estimate the efficiency of the inverter circuits used for the Photovoltaic (PV) systems. The analysis of a power electronics converter with the SPICE during the steady-state operation takes a long time and the results may not be obtained accurately due to convergence problem in the solver. The MATLAB package program is widely preferred to analyze the power electronics...
This paper presents a new asymmetrical single-phase multilevel inverter topology capable of producing nine-level output voltage with reduce device counts. In order to obtain the desired output voltage, dc sources are connected in all the combination of addition and subtraction through different switches. Proposed topology results in reduction of dc source, switch counts, losses, cost and size of the...
In this proposed work a basic unit is developed. A single unit can generate two positive and a zero level at the output. As this basic unit can develop positive levels, for negative levels, H-bridge is in addition connected to it. This is advance cascaded H-bridge multi-level inverter. With this it is possible to generate all output levels i.e. positive, zero and negative level. Also in this paper...
Traditional Boost inverters are limited by the range of output voltage, which overcame by Quasi-Z-Source Boost Inverter (qZSI). Quasi-Z-Source inverter has the capacity to acquire any expected output voltage at conduction ratio less than 0.5. This paper presents a novel topology that derived from classic quasi-Z-source inverter (qZSI) to get soft switching status for the main switch. The control method...
Advancements in solid state devices, programmable logic devices and Electronic Design Automation (EDA) tools have given a tremendous support to the development of digital controllers. High performance motor controllers usually require complex algorithm and long computation time. This makes the implementation task more complex. Features of parallel processing and high speed computing of Field Programmable...
This manuscript introduces an efficient and generalized basic topology adopted for multilevel inverters. It is shown that the proposed structure is in line with significant savings in part counts and control devices. According to the basic topology, a new structure for sub-multilevel inverter is suggested. In continue, cascaded multilevel inverter is realized based on the series connection of n sub-multilevel...
Z-source family has been widespread in photovoltaic (PV) applications. In trasformerless grid-connected PV systems, the common mode voltage (CMV) time variations, cause the leakage current flow. This current flows through the stray capacitance of the PV panels. For a Z-Source Inverter (ZSI), the CMV would have higher high-frequency harmonics, due to the shoot through states within the switching cycles...
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...
Cascaded H-bridge multilevel inverter is a matured topology used in several industries and also being used in renewable energy applications due to its several advantages over traditional two-level inverter. This paper is focused on the study of five-level and fifteen-level cascaded H-bridge inverter and total harmonic distortion in output voltage waveforms is compared. Phase disposition technique...
A modified multilevel inverter (MLI) structure has been presented for Photovoltaic (PV) fed 2.3 kV micro-grid applications. To feed the cascaded multilevel micro-grid connected inverter (CM-MGCI) voltage, a PV array is designed considering the environmental effects of Bangladesh. We have estimated the performance of the classical and a modified cascaded H-bridge (CHB) MLI with level-shifted carrier...
Selective Harmonic Elimination (SHE) is an established technique to eliminate unwanted harmonics that causes aliasing effect in communication systems and affects power quality in electrical systems. In this paper, an analytical approach for SHE is proposed for harmonic elimination in a multilevel inverter. Traditionally, numerical methods like Newton Raphson Algorithm are opted to solve the transcendental...
In this paper, a new single-phase asymmetrical multilevel inverter topology is proposed. The topology is capable of producing n-level output voltage with reduced device counts. It is achieved by arranging available switches and dc sources to obtain maximum combinations of addition and subtraction of the input dc sources. To verify the viability of the proposed topology, circuit models for nine-level,...
The multilevel inverter technology has gained a tremendous significance in the research area. This paper proposed a new controller for generating the switching sequence of power devices used in multilevel inverter to produce the desired output. An embedded code has been developed to control the switching states of different IGBT switches. To validate the effectiveness of the proposed technique to...
Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to make full utilization of the PV array output power which depends on solar irradiation and cell temperature. This paper proposes simulation and hardware of a grid connected photovoltaic system which is interfaced with the power system network through a DC-DC boost converter. The maximum power point tracking...
This paper presents an integration of a low cost microcontroller with a power converter for controlling the output voltage. Here, it will benefit the UTHM final year student in order to apply what have been taught during Power Electronics subject in Year 3. The power converter that has been developed is the zero voltage switching (ZVS) with inverter voltage control mechanism. As for the microcontroller...
A single-phase 9-level cascaded multilevel inverter with SHE PWM, and battery balanced discharge functions is presented in this paper. Each H-bridge is connected to separate DC source and produce different voltage levels −Vdc, 0, +Vdc. Each cell voltage will differ apart over time. So always switch on the battery with highest voltage that is in descending manner. Then the discharging time is dramatically...
Power converter is an important technology in industrial process, train traction and ship propulsion powered by different electric drive system. In this paper, sub-multilevel inverter is used to obtained multilevel waveform which uses reduced number of switches in comparison of other conventional multilevel inverter for same output levels. A comparison of THD produced in the output voltage generated...
This paper presents, a controller based on dynamic evolution technique to control the three phase power inverter's output for large load changes. Proposed controller methodology is analysis and is tested on three phase inverter in MATLAB/Simulink for star and delta load with balanced and unbalanced combination. This system is also tested for lagging and leading nature of load by connecting an inductor...
To fulfill increasing green energy demand; installation of Photovoltaic solar farms are rapidly growing in various manners. PV solar farms feed active power during day time and become inactive in the night time. The increasing penetration level of Distributed Generations causes a rise in voltage at Point of Common Coupling (PCC) due to reverse power flow. To regulate voltage at PCC; utilities need...
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