The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<<ETX>>

Multi-level conversion : high voltage choppers and voltage-source inverters

A new simplified multilevel inverter topology for DC AC conversion

Our dependence on fossil fuels is drastically reduced by the combined use of solar energy and Electric Vehicle (EV) charging. In this paper, a solar charger for electric vehicle is designed and developed. A dc-dc boost converter is employed to boost the solar panel voltage to station battery voltage and Maximum Power Point Tracking (MPPT) is done to optimize the output from solar panel. A buck converter is used to step down the station battery voltage to electric vehicle battery voltage. The constant voltage and constant current methods of charging are used to charge the vehicle battery. A complete simulation study of the system is carried out in the SIMULINK environment of MATLAB.

Solar Charger for Electric Vehicles

This article presents an 11-level operation of the WE (Wee)-Type inverter. The topology employs a single DC-source, has a reduced number of components, and exhibits a boosting capability. A voltage balancing algorithm is proposed where the inverter’s redundant states are employed to maintain the auxiliary DC-link voltage. It is shown that with the control algorithm, the link voltage is preserved at half the primary DC-link voltage, and the 11-level operation is possible for any load. The presented 11-level WE-type structure is also compared with recent 11-level structures and has a lowest cost factor. Two modulation strategies verify the 11-level operation of the inverter: first, a modified nearest level control (MNLC) with the usage of both zero states is developed; and, second, selective harmonic elimination (SHE) is employed, where the angles are generated using a differential evolution (DE) technique. The maximum efficiency of the inverter is 97.55 %. The performance of the inverter is validated in MATLAB/Simulink and on the hardware-in-the-loop platform.

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11-Level Operation With Voltage-Balance Control of WE-Type Inverter Using Conventional and DE-SHE Techniques

This paper proposes a hybrid wind-tidal harvesting system (HWTHS). To extract maximum power from the wind and tidal, HWTHS implements particle swarm optimization (PSO) algorithm in maximum power point tracking (MPPT) method. The proposed HWTHS had been tested on the range of possible input appropriate to the characteristics of the southern coast of Java. The presented result shows that by using PSO-based MPPT algorithm, maximum power point can be achieved. Thus the efficiency of HWTHS is 92 %, 94 % in wind section and 91 % in tidal section. By using PSO-based MPPT, HWTHS can respond well to changes in wind and tidal speed, whether it's a change from low speed to a higher speed or change from high speed to lower speed wherein time to reach new steady state is ± 0.1 s. At varied wind and tidal speed, PSO algorithm can maintain Cp of the system in the range of 0.47 - 0.48 so that power can be extracted to the maximum.

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Maximum Power Point Tracking using Particle Swarm Optimization Algorithm for Hybrid Wind-Tidal Harvesting System on the South Coast of Java

The five-level inverter has been used for many applications in renewable energy systems. Even though its harmonic distortion was lower than the conventional two-level inverter. The five-level converter has some disadvantages such as increasing power semiconductor, complex pulse width modulation control methods, and problem with the voltage balancing of the capacitor. This paper aims to propose a modified five-level inverter based on sinusoidal pulse width modulation using phase shifted carrier to enhancing the capacitor voltage balancing. This modified five-level inverter reduces the overall cost and the complexity of the pulse width modulator. Thus making the proposed control system highly simple. The performance and its controller were validated by means of standard laboratory equipments. The analysis, simulation and implementation result showed better performance of five-level inverter.

A Simple Strategy of Controlling a Balanced Voltage Capacitor in Single Phase Five-Level Inverter

In this paper has been studied about design and implementation of battery charging system This system applied for buck-boost chopper as power transfer A method to receive a maximum power from power to voltage curve in photovoltaic (PV) is called maximum power point tracker (MPPT) Incremental conductance (IC) current control method is used in MPPT which is derived from perturb and observed (P&O) method A model has been analyzed and simulated on Power Simulator software also with the hardware implementation using dsPIC30F4012 have done Finally, laboratory test to charge 2 and 3 batteries have been done to verify this method From the experimental result, efficiency of the proposed control system from PV or sun energy to electrical energy are 5921% for 2 batteries and 5838% for 3 batteries (comparison between maximum power in parameter with P in), and the converter efficiency are 7403% for charging 2 batteries and 8420% for charging 3 batteries (come from comparison of P in and P out)

Design and implementation of solar power as battery charger using incremental conductance current control method based on dsPIC30F4012

Increasing demands of power conversion technology encourages multilevel converters emerge as a solution to overcome limitations at power ratings in conventional methods of power converters. This paper discusses about a new asymmetrical construction of an 11-level inverter, despite the focus on the following design, few comparisons of the conventional topological construction will be stated. Limitations in conventional types topologies often deals with its complexity and volume. It will be furthered mentioned how the asymmetrical topology of the 11-level inverter design deals and overcome these limitations and reduce harmonic distortions for grid-tied PV systems. The proposed construction is designed and simulated by PSIM software. Analysis of Real-Time Simulation of the proposed design results in a THD value of 1.19%

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Design and Simulation of an Asymmetrical 11-Level Inverter for Photovoltaic Applications

The use of power inverter technology with low harmonics content is rapidly growing. For decades, researchers have conducted investigations to minimize its harmonics content, leading to the creation of a five-level inverter. This new topology often deals with many power semiconductor switches, thereby making it difficult to control. Therefore, this paper studies a further simulation and hardware implementation of the one leg control strategy of the single-phase five-level inverter design with efficient control of switches operated in a line frequency to achieve a higher-level demand. The verification of this research is a simulation and prototype implementation carried out in the laboratory

/pdf/one-leg-control-strategy-in-single-phase-five-level-inverter-3xv3rut8tp.pdf

One Leg Control Strategy in Single-Phase Five-Level Inverter

The power inverter technology with low harmonics content is used for many applications, such as in new and renewable energy sector. In the last decades, some researchers explored its inverter to minimize the harmonics content, and one of the solutions is a five-level inverter. A single-phase five-level inverter has a good performance in power conversion and improved performance. Nevertheless, the conventional five-level inverter topology always deals with many power semiconductor switches and a complex control algorithm. This paper, therefore, presents a new topology of a five-level inverter using four active switches.The new topology can work well as a single phase-five-level inverter with a novel Sinusoidal Pulse Width Modulation (SPWM) control algorithm using level-phase shifted carrier strategy. The new inverter has a simple power circuit and control strategy. The verification of this research is a simulation and prototype implementation, carried out in a laboratory. The results show that the proposed control strategy is capable of achieving five-level with a simple control strategy.

/pdf/a-new-topology-of-a-single-phase-five-level-inverter-8ykdtae8re.pdf

Leonardus Heru Pratomo

Papers

A Simple Strategy of Controlling a Balanced Voltage Capacitor in Single Phase Five-Level Inverter

Design and implementation of solar power as battery charger using incremental conductance current control method based on dsPIC30F4012

Design and Simulation of an Asymmetrical 11-Level Inverter for Photovoltaic Applications

One Leg Control Strategy in Single-Phase Five-Level Inverter

A New Topology of a Single-Phase Five-Level Inverter