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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...
Cascaded multilevel inverter (MLI) topologies have received an attractive solution for grid connected PV system. In this paper, two-cascaded MLI topologies are presented for grid connected PV system. These are seven level cascaded H-bridge multilevel inverter and three phase cascaded voltage source multilevel inverter. In both presented MLI configurations, each PV module is connected to one DC-DC...
H-bridge cascaded inverter can be used for harmonic compensation in medium and high voltage systems. As the equivalent switching frequency is high, L-type filter is commonly used for H-bridge cascaded inverter. Meanwhile, considering device safety and filtering effect, inductance value of L filter is large. When the command current contains harmonics, especially high harmonics, large connecting inductance...
AC/DC converters for worldwide deployment or multiple applications are often required to operate with single-or three-phase AC connections at a variety of voltages. Electric vehicle charging is an excellent example: a typical AC/DC converter optimized for a 400 V three-phase European connection will only produce about 35% of rated power when operating on a 240 V single-phase connection in North America...
This paper presents a single-stage isolated softswitching tri-port converter for integrating a renewable resource like solar PV, and energy storage with single-phase AC grid through high-frequency galvanic isolation. The single-stage approach reduces the component count, and the full-range softswitching feature realizes higher efficiencies compared to the state-of-the-art methods. A significant advantage...
In this paper, a new ladder transistor clamped multilevel inverter topology is proposed with the aim of reducing the number of transistor, while maintaining the bidirectional-controlled current flow capability of the transistor-clamped topologies. The basic structural features of the topology are presented along with their operational purpose. The merits of the new topology with respect to other topologies...
This paper proposes a 5-level single-phase multilevel inverter topology with reduced number of components. In order to validate the proposed structure, simulation and experimental results are presented. In addition, the proposed topology is compared with an existing counterpart structure in terms of number of levels and number of devices and value of power supply.
This paper presents theoretical and experimental discussions on low-voltage-ride-through (LVRT) operation of a modular multilevel single-delta bridge-cell (SDBC) inverter intended for utility-scale photovoltaic (PV) systems. As the penetration of distributed generation from renewable energy sources connected to medium- and high-voltage grids increases, grid-tied inverters progressively need to abide...
Grid connected PV systems are the most popular solar electric system on the market today. The most important device in the grid-connected PV system is the inverter. This paper presents a survey on the grid connected PV inverters and the system topologies used for grid connected PV system. The review describes different two level inverter topologies as well as multilevel inverter topologies. Cascaded...
Multilevel Modular Cascade Converters (MMCC) can be used to provide higher effective switching frequencies and reduce harmonic distortion in classical converter problems such as BESS and STATCOM. To successfully implement a MMCC in a STATCOM application it is necessary to balance dc-link voltages of the individual modules and track a reference output current. This work presents master and individual...
In this paper a laboratory power inverter platform is proposed. The platform can operates autonomously by choosing an adequate signal processor or controlled by the powerful dSpace 1104 board, facilitating the rapid implementation of the design algorithms. At the same time, scalar and field oriented control of the three-phase asynchronous machine through the ControlDesk tool have been developed. Functional...
The modular multilevel converters (MMC) has been investigated for a long time and has attracted increasingly more attentions due to its special topology. In order to generate more voltage levels with less power semiconductors for the MMC, this paper presented a novel topology of modular multilevel converters. There are two innovations for the proposed topology. 1. The current limiting inductance in...
High frequency is an effective method to improve transmission efficiency of inductively coupled power transfer (ICPT) system. However, it is hard for the high capacity semiconductor device to meet the high frequency need. In this paper, a novel multiple-frequency inductively power transfer system is proposed. By adopting a novel multiple-frequency topology of inverter, the transfer frequency of the...
In most inverters, it is required to obtain ac power with reduced cost. Especially, in power conditioners for small power like photovoltaic power generation, the reduced cost is more important. Because the circuit construction is very simple, so there would be little room to modify its fundamental construction. In such situations, some novel circuit constructions were proposed by the authers. In this...
In this paper, a cascaded multilevel inverter is implemented for resistive as well as RL load. Working of Cascaded multilevel inverter is studied for various levels of voltages by implementing proper switching. To verify the operation of the proposed inverter, simulation is completed using MATLAB for various levels of outputs such as nine, eleven, fifteen, twenty seven, thirty three and thirty nine...
The series resonant DC/DC converter with an isolation transformer and bridge mode inverter input junction, at its operation in the Buck case, is investigated, at that input DC supply circuit comprises the qZ (quasi-Z) link as impedance source. Operation at such Buck case can be provided under different inverter bridge control methods. Recommended by the literature sources, is the method of control...
The paper presents a single stage soft-switching tri-port converter for integrating renewable sources like PV, and battery storage with grid through high-frequency isolation. The proposed tri-port converter can be easily configured to connect to single or three-phase ac grids and is capable of realizing soft-switching across the entire range of operating load levels. The single stage approach reduces...
A control strategy for bidirectional flow of electromagnetic stirring is proposed. The topology structure of the system includes the forward stage PWM converter and the backward stage two-phase three-leg converter, which both can work in the rectifying and inverting status. So bidirectional energy flow can be realized. The control method for the forward stage is the double loop control with ripple...
The challenge of integration and control of electric energy posed by microgrid can be addressed by introducing the solid state transformer proposed by the FREEDM center. This research focuses on the voltage regulation issue of SST by adopting dynamic phasor-based modeling and internal model control based nested loop PI control. The main contribution of the paper is use of internal model control design...
A conventional 3-level PWM Inverter and a Cascaded Multilevel Inverter, both rated at 230Vrms voltage output and 3KW are analysed using the Switching Function. The PWM signal for the 3-level inverter is derived by applying the Switching Function Technique to the equal area principle. For the Cascaded Multilevel Inverter the Switching Function Technique is initially applied to each H-bridge, and then...
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