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This paper discusses about the hybrid cascaded nine level inverters for photovoltaic applications. Cascaded multi-level inverter is made up of series connected half bridge inverters and the output voltage of cascaded MLI is the sum of all inverter output voltages. Cascaded MLI produce staircase output voltage waveform having less harmonics, high output voltage, lower acoustic noise, as compared to...
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...
Grid synchronisation plays a vital role in grid tied inverters where the phase, frequency and voltage amplitude of grid is a critical information. In order to extract this information accurately, an improved technique of single-phase synchronous reference frame phase locked loop (SRF-PLL) is used in grid tied inverters. This method uses a transport delay block and a changed Park transform in such...
In this paper, a reactive power sharing strategy that uses droop controller combined with virtual impedance and estimating the voltage drop due to the line impedance to improve significantly improves the reactive power control and sharing accuracy. Because of, with a given minimum allowable voltage of system, the voltage droop slope cannot be made arbitrarily large, so this paper presents a better...
The distribution static compensator (DSTATCOM) is the FACTS device used for regulate voltage in power distribution network. In this paper, the particular application of a DST-ATCOM in voltage control mode is investigated in a power distribution system. Simulated performance of DSTATCOM is presented at varying conditions. At the end, the result of simulation with Matlab Simulink software has been presented.
Multi-level inverters became a competitive technology in the field of medium voltage inverters. Cellular H-Bridge (CHB) is a traditional multilevel topology, which seems to have a lot of attractive features in the MV applications. During the MV product development, rapid prototype methods like co-hardware simulation can be applied to shorten the inverter control verification process. This paper presents...
This paper presents the assessment of diode clamped multilevel inverters (DCMLI) and cascaded multi-level inverter (CMLI). For each topology its main features and its implementation using MATLAB-Simulink® are presented. From a case study the inverters are compared taking into account the number of elements required, the waveform of the output voltage, the total harmonic distortion on the voltage signal...
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...
In this paper, a grid connected photovoltaic (PV) system with an efficient Maximum Power Point Tracking Algorithm (MPPT) technique named Adaptive Neuro Fuzzy Inference System (ANFIS) is presented. The main aim of proposed system is to reach the Grid Voltage demand, manage the power flow, inject the excess power into the grid, and charge the battery from the grid when required. The MPPT method aides...
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...
The main problem in most existing control methods for uninterruptible power supply (UPS) inverters is their excessive complexity. This problem is successfully solved in multi-loop control methods by simple proportional controllers. Nevertheless, using the simple proportional controllers instead of conventional controllers, such as a proportional-resonant (PR) or a proportional-integral (PI) controller,...
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...
Uninterruptible Power Supplies (UPSs) are used to supply a wide variety of critical loads in situations of power outage or unexpected voltage fluctuations. Various UPS topologies provide different level of power quality to the critical load. On-line topology provides the best protection, and it is often the preferred choice for larger UPS installations. This paper presents a single-phase multi-source...
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...
This paper develops the self control strategy of the Brushless DC Motor (BDCM) fed by the reduced Three Switch Three Phase Inverter (TSTPI) using the Xilinx Kintex 7 Field Programmable Gate Arrays (FPGA) package. This proposed command begins with a test simulation on the numerical environment Matlab using in the first step the Simulink toolbox and in the second step the Xilinx System Generator (XSG)...
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...
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