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This paper presents a comprehensive overview of power converters and their control techniques for AC microgrids. The aim is to give an insight and direction for researchers and applications on promising topologies, control, and application within future smart grid. The paper first focuses on presenting various power converter topologies used in AC microgrids. Then, suitable control techniques for...
A single phase seven level inverter topology with fewer components using proportional integration controller is presented in this paper. The pulse width modulation is employed to generate gating signals for power switches. The proposed topology can be implemented for three phase application. The Separate dc sources can be replaced by solar PV arrays. The complete system is simulated using MATLAB/SIMULINK...
The whole world is focusing on the utilization of renewable energy sources in order to mitigate the world power crisis. Power electronics is being used in a large scale for the renewable energy conversion in a more efficient manner. It has a great impact on controlling as well as interfacing the renewable system with both the grid and standalone applications. Hence more and more emphasis is given...
Many new cascaded multilevel inverter (MLI) topologies have recently been proposed and published in the literature. All proposed topologies demand significant amount of semiconductor components and input dc supplies, which is considered the main drawback for the implementation of three phase cascaded MLIs. This paper proposes a new generalized concept that could be employed within any existing cascaded...
In this paper, a new multilevel inverter topology which can be operated in both symmetrical and asymmetrical configurations has been proposed. In order to produce all steps of voltage at output, four different algorithms are proposed to find the value of DC sources. The proposed topology reduce switch count, gate driver circuits, total voltage blocking capability and isolated DC voltage sources which...
A novel, efficient multilevel inverter topology has been proposed which generates the seven level output voltage using seven power switches only along with simple and modern pulse width modulation technique. This inverter has offered the advantages of, less component count, reduced switching loss, high efficiency and low cost. Due to the less number of switch components the complexity in generation...
A robust and reliable wind power evacuation scheme through a Permanent-Magnet Synchronous Generator (PMSG) is proposed in this paper. In this topology, a generatorside passive bridge rectifier and a grid-side Buck Boost Inverter (BBI) is employed to facilitate an efficient and economical Wind Energy Conversion system. In BBI, the peak value of the alternating output voltage is independent on the direct...
In this paper, a high frequency linked cascaded multilevel inverter (CMLI) is presented, which brings simplicity for CMLI to connect in renewable systems and electronic vehicular applications. The requirement of multiple isolated dc-supplies and their balancing is a critical drawback in CMLI and for this reason; it is very difficult to connect a CMLI directly with any system. The utilization of multi-winding...
A new Cascaded Multilevel inverter (CMLI) concept is presented in this paper, which is applicable to any existing CMLI topologies. The proposed new three phase MLI topology consists of level generator stage (LGS) and phase generator stage (PGS). While the PGS contains a specific structure of 12-semiconductor switches and 12-diodes, the LGS structure depends on the existing CMLI topologies. The main...
In this paper, a new single-phase multilevel inverter topology suited for distributed DC sources is proposed. The proposed inverter is comprised of a voltage-level generator connected in series to the input of the classical H-bridge. The voltage-level generator is only able to generate positive DC voltage levels at its output. The H-bridge is used to generate the negative and zero voltage levels....
The drop of prices of photovoltaic technology has attracted investors to develop medium and large scale photovoltaic power plants (PVPPs). Because of the extent of land occupied by these PVPPs, the solar radiation along the plant is different. This situation causes several problems into the grid. Thus, the objective of this paper is to analyse the effect of a 6 MW PVPP at the point of common coupling...
This paper proposes a sliding-mode control (SMC)-based scheme for the variable-speed direct-driven wind energy conversion systems (WECS) equipped with a permanent magnet synchronous generator connected to the grid. In this paper, diode rectifier, boost converter, neutral point clamped inverter, and L filter are used as the interface between the wind turbine and grid. This topology has abundant features...
Small scale hydropower has a considerable untapped potential, able to contribute to the increased energy demand. The integration of these systems into microgrids is an emerging solution for the electrification of remote areas and for self-sustainable power systems. This paper is devoted to the design optimization of grid-connected pico-hydro systems using conventional photovoltaic inverters, providing...
In this time, Multilevel Inverter (MLI) innovations turn into an unimaginably primary decision in high power medium voltage energy control range. Despite the fact that multilevel inverter has various advantages but since of utilizing more number of semiconductor switches, it has disadvantages in the vein of high level, extensive size and high cost. To defeat this issue another multilevel inverter...
In this paper a Marx generator principle has been used to generate a 1.6 kV pulse at the output. Two groups of capacitors with anti-parallel charging is employed [6]. In order to reduce the switching and conduction losses resonance phenomenon has been used to trigger the switches. Insulated Gate Bipolar Transistor (IGBT) switches are employed to connect the charged capacitors in series to supply the...
In this paper, a new power electronics interface topology for Direct Drive Wind Turbines (DDWTs) to improve the system reliability and with a potential to decrease the size of the Permanent Magnet (PM) generator is presented. In the proposed topology the grid-side Voltage Source Converter in a traditional DDWT is replaced by a three-phase single-stage boost inverter. This enables the use of a low-voltage...
In this paper, a new generator-converter system for direct drive wind turbines in order to decrease the capital cost and improve the system reliability is presented. The grid-side Voltage Source Inverter (VSI) is replaced by a single-stage boost inverter. This provides flexibility to design a low-voltage generator and thus decreasing the number poles required in the generator. A 1.5MW generator for...
This paper deals with the design and development of conventional Level-shifted PWM techniques in a field programmable gate array (FPGA) for asymmetrical converters in a Trinary Hybrid Multilevel Inverter topology. Each modulation technique has been implemented in FPGA through a 32-bit single precision floating point architecture in accordance to IEEE-754 standard. Portability to other devices is ensured...
Todays, the pulsed power systems have been employed in many applications. To meet the requirement of user, the pulse generator should enjoy the advantages of compactness, high flexibility, high pulse repetition rate and cost efficiency. Among all of converters that can be used to generate high voltage pulses, capacitance diode voltage multiplier (CDVM) is a good candidate to meet the mentioned requirements...
In this paper, a new topology named OTF (One-Two-Five) topology is proposed for an asymmetrical multilevel inverter. The OTF topology is implemented with less number of switches compared with other conventional and recently invented topologies. The reduction of switches leads to low cost of the inverter. The reduction of the switches is usually associated with more number of levels achieved and reduced...
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