scholarly journals Common-Ground-Type Single-Source High Step-Up Cascaded Multilevel Inverter for Transformerless PV Applications

Mathematics ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1716 ◽  
Author(s):  
Hossein Khoun Jahan ◽  
Naser Vosoughi Kurdkandi ◽  
Mehdi Abapour ◽  
Kazem Zare ◽  
Seyed Hossein Hosseini ◽  
...  
Keyword(s):  
Common Ground ◽  
Industrial Applications ◽  
Multilevel Inverter ◽  
Single Source ◽  
Pv System ◽  
Leakage Currents ◽  
Symmetric Configuration ◽  
Pv Modules ◽  
Cascaded Multilevel Inverter ◽  
Asymmetric Configuration

The cascaded multilevel inverter (CMI) is one type of common inverter in industrial applications. This type of inverter can be synthesized either as a symmetric configuration with several identical H-bridge (HB) cells or as an asymmetric configuration with non-identical HB cells. In photovoltaic (PV) applications with the CMI, the PV modules can be used to replace the isolated dc sources; however, this brings inter-module leakage currents. To tackle the issue, the single-source CMI is preferred. Furthermore, in a grid-tied PV system, the main constraint is the capacitive leakage current. This problem can be addressed by providing a common ground, which is shared by PV modules and the ac grid. This paper thus proposes a topology that fulfills the mentioned requirements and thus, CMI is a promising inverter with wide-ranging industrial uses, such as PV applications. The proposed CMI topology also features high boosting capability, fault current limiting, and a transformerless configuration. To demonstrate the capabilities of this CMI, simulations and experimental results are provided.

Application of Cascaded Multilevel Inverter for High Voltage Grid-Connected PV System

2015 ◽  
Vol 1092-1093 ◽  
pp. 17-21
Author(s):  
Yi Dan Li ◽  
Du Ting Wang ◽  
Hong Ming Kang ◽  
Hong Fang Ru
Keyword(s):  
Multilevel Inverter ◽  
Operating Voltage ◽  
Generation System ◽  
Pv System ◽  
Photovoltaic Generation ◽  
In Series ◽  
Simulation Results ◽  
High Level ◽  
Pv Generation ◽  
Cascaded Multilevel Inverter

The cascaded multilevel inverter may be the best topology to satisfy continuously increasing capacity and scale of grid-connected photovoltaic generation system due to its modularized circuit layout and sufficiently high operating voltage without devices in series. The operating principle of the cascaded multilevel inverter is presented. The control strategy of carrier phase shift PWM is proposed and discussed in detail. A grid-connected photovoltaic (PV) generation system based on a seven level cascaded inverter is provided. Simulation model of a seven level cascaded inverter with phase shifted PWM is built in Simulink environment and simulation results verify that the cascaded multilevel inverter can output high level voltage without devices in series, reduce harmonics, and output high quality waveforms.

scholarly journals Grid Interconnecting Solar Generation System Using Transformer Less Cascaded Seven Level Inverter

2019 ◽  
pp. 235-245
Author(s):  
Naveen Kokku
Keyword(s):  
Pulse Width Modulation ◽  
Electronic Device ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Generation System ◽  
Leakage Currents ◽  
Control Scheme ◽  
Passive Filters ◽  
Cascaded Multilevel Inverter ◽  
Sinusoidal Pulse Width Modulation

Multilevel inverter is a power electronic device that is used for high voltage and high power applications and has many advantages like, low switching stress, low total harmonic distortion (THD). Hence, the size and bulkiness of passive filters can be reduced. This paper proposes three topologies of a 7- level cascaded multilevel inverter with reduced number of switches with the 5-level cascaded multilevel inverter and 3-level inverter. The topologies consist of circuits with 9 switches for 7-level CMLI, 8 switches for the 5-level CMLI and 6 switches for the 3-level inverter. Apart from the reduction in switch count this paper also includes minimization of leakage currents and comparative analysis of levels of CMLI’s in every inverter connected to PV source. The control scheme based on Sinusoidal Pulse Width Modulation (SPWM) is adopted due to its ease of implementation. More number of levels results in reduced THD and nearly sinusoidal output. Simulation is performed using Matlab/Simulink.

Grid‐tied single source quasi‐ Z ‐source cascaded multilevel inverter for PV applications

2019 ◽  
Vol 55 (6) ◽  
pp. 342-343 ◽  
Author(s):  
R.A. Guisso ◽  
A.M.S.S. Andrade ◽  
H.L. Hey ◽  
M.L. da S. Martins
Keyword(s):  
Multilevel Inverter ◽  
Single Source ◽  
Cascaded Multilevel Inverter

scholarly journals Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7643
Author(s):  
Lingling Cao ◽  
Jiefeng Lin ◽  
Shikai Chen ◽  
Yuanmao Ye
Keyword(s):  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Reactive Power ◽  
Input Voltage ◽  
Industrial Applications ◽  
Multilevel Inverter ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Cascaded Multilevel Inverter

Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead of capacitors. Then, a special hybrid pulse width modulation strategy combing level-shifted pulse width modulation (LS-PWM) and phase-shifted pulse width modulation (PS-PWM) was developed for the inverter. With this modulation algorithm, the power between cascaded units is automatically balanced, and the voltage of the capacitor in each unit is also automatically balanced to the dc input voltage. In addition, the optimized capacitor voltage ripple makes it possible to use a smaller capacitor to produce a better output voltage waveform. Theoretical analysis, simulation and experimental results show that the equivalent switching frequency of the cascaded multilevel inverter is twice the original frequency so that the output voltage harmonics are only distributed near even multiples of the carrier frequency.

scholarly journals A Single Source Cascaded Multilevel Inverter

2019 ◽  
Vol VII (II) ◽  
pp. 37
Author(s):  
Poornima D ◽  
Bharath Kumar M R ◽  
Andrew Mathew Domnic F
Keyword(s):  
Multilevel Inverter ◽  
Single Source ◽  
Cascaded Multilevel Inverter

A survey on two level and cascaded multilevel inverter topologies for grid connected PV system

2017 ◽  
Author(s):  
Abdullah M. Noman ◽  
Abdullrahman A. Al-Shamma'a ◽  
Khaled E. Addoweesh ◽  
Ayman A. Alabduljabbar ◽  
Abdulrahman I. Alolah
Keyword(s):  
Multilevel Inverter ◽  
Pv System ◽  
Cascaded Multilevel Inverter
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