Symmetrical switching strategy based on reduced switching state in a three‐phase multilevel converter with a single faulty cell

2021 ◽  
Author(s):  
Omid Zolfagharian ◽  
Ali Dastfan ◽  
Mohammad Hoseintabar Marzebali
Keyword(s):  
Multilevel Converter ◽  
Switching Strategy ◽  
Faulty Cell ◽  
Three Phase ◽  
Switching State

Control of a Three-Phase Four-Wire Modular Multilevel Converter as a Grid Emulator in Fault Scenarios

2021 ◽  
Author(s):  
Ming Jia ◽  
Shenghui Cui ◽  
Katharina Hetzenecker ◽  
Jingxin Hu ◽  
Rik W. De Doncker
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Three Phase

An Application Seven-Level Converter for VSC-HVDC Station System

2015 ◽  
Vol 799-800 ◽  
pp. 1211-1216
Author(s):  
Narin Watanakul
Keyword(s):  
Process Control ◽  
Control Algorithm ◽  
Current Control ◽  
Multilevel Converter ◽  
Two Phase ◽  
Hvdc System ◽  
Hvdc Transmission ◽  
Data Process ◽  
Three Phase ◽  
Level Converter

This paper presents an application of an asynchronous back to back VSC-HVDC system. Which uses multilevel converter a 7-level Diode-Clamped SPWM converters topology technique for the realization of HVDC system, rated 300MVA (±300 kV). The controller has been proposed by using PQ control and feed-forward decoupled current control algorithm. The design and experimentally controllers of VSC in lab scaled test, MATLAB/Simulink program were performed VSC-HVDC transmission system, the simulation in order to evaluate transient performance, can be controlled independently under two phase to ground faulted and three phase to ground faulted conditions. The system are used as a guideline for analysing and design of the data process control with the PQ-control HVDC system.

Mitigation of DC-Link Current Ripple for Dual Three-Phase Flux-Adjustable Hybrid PMAC Drives Using Collaborative Switching Strategy

2020 ◽  
Vol 67 (9) ◽  
pp. 7202-7216
Author(s):  
Zheng Wang ◽  
Xueqing Wang ◽  
Xiaojie Yang ◽  
Congjian Wen ◽  
Yu Gong ◽  
...  
Keyword(s):  
Switching Strategy ◽  
Three Phase ◽  
Current Ripple

scholarly journals Model Predictive Voltage Control with Optimal Duty Cycle for Three-Phase Grid-Connected Inverter

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Shahrouz Ebrahimpanah ◽  
Qihong Chen ◽  
Liyan Zhang ◽  
Misbawu Adam
Keyword(s):  
Steady State ◽  
Duty Cycle ◽  
Tracking Error ◽  
Voltage Control ◽  
Sampling Period ◽  
Sampling Interval ◽  
Nonlinear Load ◽  
Three Phase ◽  
Switching State ◽  
Steady State Performance

This paper proposes a model predictive voltage control (MPVC) strategy with duty cycle control for grid-connected three-phase inverters with output LCL filter. The model of the system is used to predict the capacitor filter voltage according to the future output current for each possible switching state at each sampling period. Then the cost function for each prediction is determined and the switching state is selected. In the proposed method, two voltage vectors are applied during one sampling interval to achieve better steady-state performance. Finally, the optimal duration of the nonzero voltage vector is defined based on the duty cycle optimization, which is vital to the control system. The proposed strategy offers a better reference tracking error with less THD in linear and nonlinear load situations. The effectiveness of the proposed method has been verified by MATLAB/Simulink and experimental results exhibit a better steady-state performance with less sampling frequency.

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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