Multi-Level Cascaded H-Bridge Inverter Based on Three Harmonic Injection Method

2014 ◽  
Vol 986-987 ◽  
pp. 1969-1972 ◽  
Author(s):  
Man Yuan Ye ◽  
Song Li
Keyword(s):  
Modulation Index ◽  
Switching Frequency ◽  
Load Voltage ◽  
Injection Method ◽  
Cell Switching ◽  
Harmonic Injection ◽  
Simulation And Experiment ◽  
Multi Level

This paper introduces seven-level Cascaded H-bridge (CHB) inverter and work principle. Then, the strongpoint and disadvantage of multi-level inverter usual PWM technologies are analyzed and compared. We find that multi-level cascaded inverter based on three harmonic injection method have two advantages via analysis. The voltage modulation index can increase 1.15. The equivalent switching frequency of H-bridge inverter’s load voltage is N times of each cell switching frequency. At last, H-bridge inverter was investigated with simulation and experiment. The results prove that the analysis is correctness and validity.

scholarly journals Research on Current Backflow of Asymmetric CHB Multi-Level Inverter

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 214
Author(s):  
Manyuan Ye ◽  
Guizhi Song ◽  
Wei Ren ◽  
Qiwen Wei
Keyword(s):  
High Voltage ◽  
Frequency Modulation ◽  
Output Voltage ◽  
Modulation Method ◽  
Switching Frequency ◽  
Double Frequency ◽  
Hybrid Modulation ◽  
Simulation And Experiment ◽  
Multi Level ◽  
The One

For the traditional asymmetric cascaded H-bridge multi-level inverters, the conventional hybrid modulation method has the problem of current backflow in a certain modulation index range. Although the monopolar modulation method effectively solves this problem, the high-voltage unit participates in the high-frequency operation in part of the range, which limits the improvement of the switching frequency of the whole system. The hybrid frequency modulation method can reduce the switching frequency of the high voltage unit to a certain extent, but the harmonic characteristics of the output voltage will be affected. In order to solve the above problems, a double frequency modulation method based on level-shifted PWM (LS-PWM) is proposed. On the one hand, it solves the inherent power back filling problem of the traditional hybrid modulation method, on the other hand, it ensures that the output voltage of the inverter has good harmonic characteristics when the switching frequency of the high voltage unit is low. The results of simulation and experiment prove the correctness of the theoretical analysis.

scholarly journals Analysis and Implementation of a Frequency Control DC–DC Converter for Light Electric Vehicle Applications

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1623
Author(s):  
Bor-Ren Lin
Keyword(s):  
Electric Vehicles ◽  
Output Voltage ◽  
Frequency Control ◽  
Input Voltage ◽  
Pulse Frequency ◽  
Switching Frequency ◽  
Battery Charger ◽  
Dc Microgrid ◽  
Load Voltage ◽  
Transportation Vehicle

In order to realize emission-free solutions and clean transportation alternatives, this paper presents a new DC converter with pulse frequency control for a battery charger in electric vehicles (EVs) or light electric vehicles (LEVs). The circuit configuration includes a resonant tank on the high-voltage side and two variable winding sets on the output side to achieve wide output voltage operation for a universal LEV battery charger. The input terminal of the presented converter is a from DC microgrid with voltage levels of 380, 760, or 1500 V for house, industry plant, or DC transportation vehicle demands, respectively. To reduce voltage stresses on active devices, a cascade circuit structure with less voltage rating on power semiconductors is used on the primary side. Two resonant capacitors were selected on the resonant tank, not only to achieve the two input voltage balance problem but also to realize the resonant operation to control load voltage. By using the variable switching frequency approach to regulate load voltage, active switches are turned on with soft switching operation to improve converter efficiency. In order to achieve wide output voltage capability for universal battery charger demands such as scooters, electric motorbikes, Li-ion e-trikes, golf carts, luxury golf cars, and quad applications, two variable winding sets were selected to have a wide voltage output (50~160 V). Finally, experiments with a 1 kW rated prototype were demonstrated to validate the performance and benefits of presented converter.

A 17-Level Switched Voltage Source Multi-Level Inverter Topology with Low-Switching Frequency Control

2016 ◽  
Vol 44 (19) ◽  
pp. 2185-2197 ◽  
Author(s):  
Charles Ikechukwu Odeh ◽  
Linus Uchechukwu Anih ◽  
Emenike Chinedozi Ejiogu
Keyword(s):  
Frequency Control ◽  
Voltage Source ◽  
Switching Frequency ◽  
Multi Level ◽  
Inverter Topology

A Harmonic Injection Method Equivalent to the Resonant Controller for Speed Ripple Reduction of PMSM

2021 ◽  
pp. 1-1
Author(s):  
Xiaosheng Wang ◽  
Chaoqiang Jiang ◽  
Feifei Zhuang ◽  
Christopher H. T. Lee ◽  
C.C. Chan
Keyword(s):  
Injection Method ◽  
Harmonic Injection ◽  
Ripple Reduction ◽  
Resonant Controller

scholarly journals X-Type Step-Up Multi-Level Inverter with Reduced Component Count Based on Switched-Capacitor Concept

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1987
Author(s):  
Erfan Azimi ◽  
Aryorad Khodaparast ◽  
Mohammad Javad Rostami ◽  
Jafar Adabi ◽  
M. Ebrahim Adabi ◽  
...  
Keyword(s):  
Power Flow ◽  
Input Voltage ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Level Control ◽  
Voltage Balancing ◽  
Simulink Model ◽  
Wide Range ◽  
Multi Level ◽  
Laboratory Prototype

This paper aims to present a novel switched-capacitor multi-level inverter. The presented structure generates a staircase near sinusoidal AC voltage by using a single DC source and a few capacitors to step-up the input voltage. The nearest level control (NLC) strategy is used to control the operation of the converter. These switching states are designed in a way that they always ensure the self-voltage balancing of the capacitors. Low switching frequency, simple control, and inherent bipolar output are some of the advantages of the presented inverter. Compared to other existing topologies, the structure requires fewer circuit elements. Bi-directional power flow ability of the proposed topology, facilitates the operation of the circuit under wide range of load behaviors which makes it applicable in most industries. Besides, a 13-level laboratory prototype is implemented to realize and affirm the efficacy of the MATLAB Simulink model under different load conditions. The simulation and experimental results accredit the appropriate performance of the converter. Finally, a theoretical efficiency of 92.73% is reached.

Sign in / Sign up

Export Citation Format

Share Document