Common-Mode Voltage Reduction of Modular Multilevel Converter Based on Chaotic Carrier Phase Shifted Sinusoidal Pulse Width Modulation

2020 ◽  
Author(s):  
Jiaxin Wang ◽  
Hong Li ◽  
Zhichang Yang ◽  
Bo Zhang
Keyword(s):  
Carrier Phase ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Common Mode ◽  
Common Mode Voltage ◽  
Sinusoidal Pulse Width Modulation ◽  
Chaotic Carrier

scholarly journals A Five-Level Converter in a Three-Level Mode for Common-Mode Leakage Current Suppression in PV-Generation Systems

2021 ◽  
Author(s):  
Aleksey Vyacheslavovich Udovichenko ◽  
Sergey Viktorovich Brovanov ◽  
Evgeny Valerievich Grishanov ◽  
Svetlana Mikhailovna Stennikova
Keyword(s):  
Leakage Current ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Renewable Energy Sources ◽  
Multilevel Converter ◽  
Generation System ◽  
Common Mode ◽  
Common Mode Voltage ◽  
Conducting Research ◽  
Pv Generation

Power generation systems based on renewable energy sources are finding ever-widening applications and many researchers work on this problem. Many papers address the problem of transformerless structures, but few of them are aimed at conducting research on structures with multilevel converter topologies. In this paper a grid-tied transformerless PV-generation system based on a multilevel converter is discussed. There are common-mode leakage currents which act as a parasitic factor. It is also known that common-mode voltage is the main cause of the common-mode leakage current in grid-tied PV-generation systems. This paper considers the space vector pulse-width modulation (PWM) technique which is used to suppress or reduce common-mode leakage current. The proposed engineering solutions for a generation system based on the multilevel converter controlled with a pulse-width modulation technique are verified by experiment.

Space vector modulation with reduced common mode voltage for six-phase drives

2020 ◽  
Vol 39 (2) ◽  
pp. 395-411
Author(s):  
Mohammad Jafar Zandzadeh ◽  
Mohsen Saniei ◽  
Reza Kianinezhad
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Torque Ripple ◽  
Drive System ◽  
Limiting Factors ◽  
Space Vector ◽  
Common Mode ◽  
Content Type ◽  
Common Mode Voltage ◽  
Space Vectors

Purpose This paper aims to present a modified space vector pulse width modulation (SVPWM) technique for six-phase induction motor drive based on common-mode voltage (CMV) and current losses which are two important issues affecting drive system behavior and quality. Design/methodology/approach It is shown that the presence of z-component currents and the presence of CMV in six-phase drive system are two major limiting factors in space vector selection. The behavior of several space vector selections in a two-level inverter considering minimum CMV and z-components is investigated. Then, the space vectors in a three-level inverter is analyzed and tried to explore an SVM technique with better behavior. Findings The analyses show that all the problems cannot be solved in a six-phase drive system with two-level inverter despite having 64 space vectors; this study tried to overcome the limitations by exploring space vectors in a three-level inverter. Originality/value The proposed pulse width modulation (PWM) strategy leads to minimum current distortion and undesired current components with zero CMV and modest torque ripple.

scholarly journals A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1607
Author(s):  
Chang-Hwan Park ◽  
In-Kyo Seo ◽  
Belete Belayneh Negesse ◽  
Jong-su Yoon ◽  
Jang-Mok Kim
Keyword(s):  
Electromagnetic Interference ◽  
Experimental Result ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Frequent Change ◽  
Common Mode ◽  
Medium Voltage ◽  
Low Level ◽  
Common Mode Voltage ◽  
Switching State

Low level modular multilevel converter (MMC) is a promising candidate for medium voltage applications such as MVDC (medium voltage DC current) transmission and megawatt machine drives. Unlike high-level MMC using nearest level modulation (NLM), the low-level MMC using the pulse width modulation (PWM) or NLM + PWM is affected by a common mode voltage (CMV) due to a frequent change of a switching state. This CMV causes electromagnetic interference (EMI) noise, common mode current (CMC) and bearing current leading to a reduction in the efficiency and durability of the motor drive system. Therefore, this paper provides a mathematical analysis on how the switching state affects the CMV and proposes three software based CMV reduction algorithms for the low level MMC system. To reflect the characteristic of MMC modulation strategy for upper and lower reference voltage independently, two separate space vectors are used. Based on the analysis, three different CMV reduction algorithms (complete CMV reduction (CCR), DPWM CMV reduction (DCR) and partial CMV reduction (PCR)) are proposed using NLC + PWM modulation strategy. The performance of the proposed CMV reduction algorithms was verified by both simulation and experimental result.

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