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Proceedings ArticleDOI

A Single Phase Hybrid Multilevel Inverter with High Step up DC-DC Converter for Photovoltaic System

01 Nov 2016-pp 327-336
TL;DR: In this paper, a Single Phase Multilevel Inverter with DC-DC High Step Up (HSU) Converter for Photovoltaic (PV) System is presented.
Abstract: This Paper presents a Single Phase Multilevel Inverter with DC-DC High Step UP (HSU) Converter for Photovoltaic (PV) System. Maximum Power Point Tracking (MPPT) assumes a noteworthy part in PV system since it expands the output power of PV system, for a given arrangement of condition and enhances the proficiency of the system. Perturb and observe is used to track the MPPT of the system .The DC-DC buck converter output voltage is 49.2V. To pick up the output voltage of 220V, a DC-DC HIGH Step UP (HSU) Converter is executed. Multilevel inverter is preferred for the proposed system, since it expands the aggregate number of output voltage levels with less number of switches. The Output voltage levels for Hybrid Multilevel inverter (HMLI) are +V dc , +2V dc /3, +V dc /3, 0V dc ,-V dc /3,-2V dc /3,-V dc . The Low switching frequency and High switching frequency (Multi reference Pulse width Modulation Technique (MRPWM)) is compared and its utilized to control the switches in the HMLI. The overall scheme is simulated by providing MATLAB/SIMULINK and the HMLI is done by utilizing PROTEUS programming and real time system.
References
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Journal ArticleDOI
TL;DR: The many different techniques for maximum power point tracking of photovoltaic (PV) arrays are discussed in this paper, and at least 19 distinct methods have been introduced in the literature, with many variations on implementation.
Abstract: The many different techniques for maximum power point tracking of photovoltaic (PV) arrays are discussed. The techniques are taken from the literature dating back to the earliest methods. It is shown that at least 19 distinct methods have been introduced in the literature, with many variations on implementation. This paper should serve as a convenient reference for future work in PV power generation.

5,022 citations

Journal ArticleDOI
01 Mar 2004
TL;DR: In this paper, a high-efficiency high step-up converter with low voltage stress on power switch, power diodes and output capacitors is proposed, which consists of an energy clamp circuit and a voltage boost cell.
Abstract: As a result of the equivalent series resistor of the boost inductor, conventional boost converters are not able to provide high voltage gain. A high-efficiency high step-up converter is proposed, with low voltage stress on power switch, power diodes and output capacitors. The circuit topology of the proposed converter consists of an energy clamp circuit and a voltage boost cell. The boost converter functions as an active clamp circuit to suppress the voltage spike on power switch during the turn-off transient period. The boost converter output terminal and flyback converter output terminal are serially connected to increase the output voltage gain with the coupled inductor. By serially connecting the secondary windings of the boost inductor, a high voltage gain is achieved with less voltage stress on the power devices, such as power MOSFET and power diodes. The operational principle and steady-state analysis are described. A 35 W converter with simulation and experimental results is presented to demonstrate the performance. It shows that the efficiency of the proposed converter is very high (nearly 93%) with four times the voltage output.

458 citations


"A Single Phase Hybrid Multilevel In..." refers background in this paper

  • ...The transformer turns ratio n1=Np/Ns and n2=Nt/Ns [4]....

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  • ...To expand the effectiveness of the system, the reverse recovery problem of the output diode can be lightened [4]....

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Journal ArticleDOI
TL;DR: This paper proposes a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulsewidth-modulated (PWM) control scheme, which was verified through simulation and implemented in a prototype.
Abstract: This paper proposes a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulsewidth-modulated (PWM) control scheme. Three reference signals that are identical to each other with an offset that is equivalent to the amplitude of the triangular carrier signal were used to generate the PWM signals. The inverter is capable of producing seven levels of output-voltage levels (Vdc, 2Vdc/3, Vdc/3, 0, -Vdc, -2Vdc/3, -Vdc/3) from the dc supply voltage. A digital proportional-integral current-control algorithm was implemented in a TMS320F2812 DSP to keep the current injected into the grid sinusoidal. The proposed system was verified through simulation and implemented in a prototype.

392 citations


"A Single Phase Hybrid Multilevel In..." refers background or methods in this paper

  • ...To lessen the DC Source, CHBMLI are connected in parallel and to expand the output voltage levels, the low frequency transformer is connected with each H Bridge Inverter....

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  • ...If Vref3 achieves zero, Vref2 will assume the liability till its amplitude crosses zero then Vref1 will be contrasted and carrier signal.[3]...

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  • ...Here we are executing the 7-level Hybrid inverter which comprises of voltage dividing capacitor, Bidirectional switch with diode combination and H Bridge Inverter [3]....

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  • ...To increase the "n" number of levels the transformer must be expanded for every H Bridge Inverter, so that the general productivity of the system will be diminished because transformer will produce the losses....

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  • ...The seven level inverter generates a output voltage such as +Vdc,+2Vdc/3,+Vdc/3,0Vdc,-Vdc/3,-2Vdc/3,-Vdc.[3] The Proposed 7 level inverter consists of two bidirectional switches, one H Bridge inverter, and 8 diodes for bidirectional current flows through two switch S5 & S6 ....

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Journal ArticleDOI
TL;DR: In this article, a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch was proposed, which produces a significant reduction in the number of power devices and capacitors required to implement a multilabel output.
Abstract: Multilevel converters offer high power capability, associated with lower output harmonics and lower commutation losses. Their main disadvantage is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This work reports a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch. The new topology produces a significant reduction in the number of power devices and capacitors required to implement a multilevel output. The new topology is used in the design of a five-level inverter; only five controlled switches, eight diodes, and two capacitors are required to implement the five-level inverter using the proposed topology. The new topology achieves a 37.5% reduction in the number of main power switches required (five in the new against eight in any of the other three configurations) and uses no more diodes or capacitors that the second best topology in the literature, the Asymmetric Cascade configuration. Additionally, the dedicated modulator circuit required for multilevel inverter operation is implemented using a FPGA circuit, reducing overall system cost and complexity. Theoretical predictions are validated using simulation in SPICE, and satisfactory circuit operation is proved with experimental tests performed on a laboratory prototype

277 citations


"A Single Phase Hybrid Multilevel In..." refers background in this paper

  • ...66, just the carrier signalis contrasted and the three reference sign of Vref1 Vref2 and Vref3.[6][7]...

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  • ...When the Modulation list is more than 0.33 and under 0.66 ,just the carrier signal is contrasted and the two reference sign of Vref2 and Vref3....

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  • ...When the Modulation list is more than 0.66, just the carrier signalis contrasted and the three reference sign of Vref1 Vref2 and Vref3....

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Proceedings ArticleDOI
23 Dec 2010
TL;DR: In this paper, a new structure of cascade multilevel H-bridge inverter with a low frequency three-phase transformers and a single DC power source was proposed, and computer aided simulations was performed through matlab/simulink and simulation results for seven, nine, eleven, thirteen, sixteen, seventeen and fifteen level are presented to verify the performance of proposed cascade multi-level inverter.
Abstract: Among the mature multilevel converter topologies, cascade multilevel H-Bridge inverter is promising one which is an alternative for grid-connected photovoltaic/ wind-power generator, flexible alternating current systems and motor drive application. The CMC (cascade multilevel converter) can flexibly expand the output power capability and is favorable to develop. Present paper elevates a new structure of CMC with a low frequency three-phase transformers and a single DC power source. Comparing with conventional CMC this new CMC uses less number of components for same number of output levels. As three phase transformer was employed harmonic components of the output voltage and switching losses can be diminished considerably. Computer aided simulations was performed through matlab/simulink and simulation results for seven, nine, eleven, thirteen & fifteen level are presented to verify the performance of proposed cascade multilevel inverter.

25 citations


"A Single Phase Hybrid Multilevel In..." refers background in this paper

  • ...To increase the "n" number of levels the transformer must be expanded for every H Bridge Inverter, so that the general productivity of the system will be diminished because transformer will produce the losses.[2]....

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  • ...To surge the capacity of the output power of solar cell, the maximum power point tracking is actualized [2]....

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  • ...The name hybrid indicates the combination of one H-bridge and two auxiliary switches with dc voltage source [2] [5]....

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