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Switched-capacitor Based Seven-level Boost Inverter with a Reduced Number of Devices

CSEE Journal of Power and Energy Systems 2024年第1期10卷 381-391页

作者： Weijie Lin Jun Zeng Bo Fu Zhixing Yan Junfeng Liu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China WISDRI Engineering&Research Incorporation Limited Wuhan 430074China Department of Energy Aalborg UniversityAalborg 9220Denmark School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China

The conventional multilevel inverters(MLIs)have the disadvantages of numerous devices,incapacity of boost,unbalance for capacitor’s voltage,high complexity for control,and etc.Motivated by this issue,a seven-level boost inverter(7LBI)based on a switched capacitor is presented for singlephase applications in this paper.The proposed 7LBI using only seven transistors can achieve seven output levels,1.5 voltage gain,and natural balance of capacitors’voltages without sensors or other auxiliary methods,which illustrates its suitability for the applications of renewable energy generation.The configuration of topology and operating principles are illustrated in detail.The natural balance of capacitors and capacitance calculations are deduced as well.Moreover,the comparative study is conducted for different types of MLIs.The results illustrate the merits of the proposed 7LBI with respect to reduced devices,lower voltage stress,and less power loss.Finally,a simulation for the proposed 7LBI with PWM modulation is realized based on the theoretical analysis;an experimental prototype is also implemented,verifying multilevel output,boost ability,natural balance for switched capacitors,and performance of transient response.

关键词： multilevel inverters voltage gain natural balance renewable energy generation reduced number of elements

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A new five-level inverter with reduced leakage current for photovoltaic system applications

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Protection and Control of Modern Power Systems 2022年第1期7卷 287-299页

作者： Vahid Hosseinkhani Mohammad Sarvi Department of Electrical Engineering Imam Khomeini International UniversityQazvinIran

A general growth is being seen in the use of renewable energy resources,and photovoltaic cells are becoming increasingly popular for converting green renewable solar energy into electricity.Since the voltage produced by pho-tovoltaic cells is DC,an inverter is required to connect them to the grid with or without transformers.Transformerless inverters are often used for their low cost and low power loss,and light weight.However,these inverters suffer from leakage current in the system,a challenge that needs to be addressed.In this paper,a topology with two alternative connection models is presented to stabilize the common mode voltage and reduce the leakage current.The output voltage characteristic of the proposed inverter is five-level,which reduces the harmonic distortion in the output cur-rent compared to the two-and three-level inverters.The operation modes and output of the proposed topology are described and analyzed.The structures of the proposed inverter are simulated in MATLAB/Simulink and are compared with some well-known structures.Results show that the proposed structure with both connection models effectively reduces leakage current and improves grid current THD.

关键词： Grid-connected inverters multilevel inverters Common mode voltage Leakage current

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Operation of a medium-voltage drive under faulty conditions

Operation of a medium-voltage drive under faulty conditions

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第4届国际电力电子及运动控制国际会议

作者： J.Rodríguez J.Pontt R.Musalem P.Hammond Electronics Electronics Electronics ASIRobicon Corp.New Kensington Pennsylvania USA

＜正＞ This paper presents a method for operating cascaded multilevel inverters when one or more power cells are damaged. The method is based on the use of additional switches in the power circuit to bypass the faulty cell. To control the cells, the angle of phase shifting in the carrier signals is modified according to the number of operating cells, to minimize the load voltage distortion, when the inverter operates in failure mode. The reference signals of the PWM modulators are also modified to increase the output voltage. Simulation and experimental results show the effectiveness of this method, which significantly increases the reliability of the drive.

关键词： Fault tolerance multilevel inverters power electronics.

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