Multilevel Converters – Configuration of Circuits and Systems

Akagi, Hirofumi

doi:10.1002/9781119515661.ch3

Cited by 7 publications

(6 citation statements)

References 55 publications

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“…There are two types of MLIs based on the number of voltage sources utilized to feed the MLIs as follows (Wu and Narimani, 2017a; Akagi, 2019):Single DC source.Multiple DC source.…”

Section: Topologies Of Multilevel Invertermentioning

confidence: 99%

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Review of multilevel inverter for high-power applications

Barnawi,

Alfifi,

Elbarbary

et al. 2023

FEBE

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PurposeTraditional level inverter technology has drawbacks in the aspect of Total harmonic distortion (THD) and switching losses for higher frequencies. Due to these drawbacks, two-level inverters have become unprofitable for high-power applications. Multilevel inverters (MLIs) are used to enhance the output waveform characteristics (i.e. low THD) and to offer various inverter topologies and switching methods.Design/methodology/approachMLIs are upgraded versions of two-level inverters that offer more output levels in current and voltage waveforms while lowering the dv/dt and di/dt ratios. This paper aims to review and compare the different topologies of MLI used in high-power applications. Single and multisource MLI's working principal and switching states for each topology are demonstrated and compared. A Simulink model system integrated using detailed circuit simulations in developed in MATLAB®–Simulink program. In this system, a constant voltage source connected to MLI to feed asynchronous motor with squirrel cage rotor type is used to demonstrate the efficacy of the MLI under different varying speed and torque conditions.FindingsMLI has presented better control and good range of system parameters than two-level inverter. It is suggested that the MLIs like cascade-five-level and NPC-five-level have shown low current harmonics of around 0.43% and 1.87%, respectively, compared to two-level inverter showing 5.82%.Originality/value This study is the first of its kind comparing the different topologies of single and multisource MLIs. This study suggests that the MLIs are more suitable for high-power applications.

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“…There are two types of MLIs based on the number of voltage sources utilized to feed the MLIs as follows (Wu and Narimani, 2017a; Akagi, 2019):Single DC source.Multiple DC source.…”

Section: Topologies Of Multilevel Invertermentioning

confidence: 99%

“…However, this inverter topology may be utilized to derive sophisticated converter topologies. Table 7 explains the switching pattern for 5L-FLC inverter (Rana et al ., 2019; Nordvall, 2011; Akagi, 2019; Shehu et al ., 2016; Wu and Narimani, 2017b; El-Hosainy et al ., 2017).…”

Section: Topologies Of Multilevel Invertermentioning

confidence: 99%

Review of multilevel inverter for high-power applications

Barnawi,

Alfifi,

Elbarbary

et al. 2023

FEBE

View full text Add to dashboard Cite

show abstract

“…In the last few decades, multilevel inverters became an appealing choice for electrical engineers in high power industrial AC applications due to its superior flexibility in output voltage and frequency, reduced filter requirements, lower dv/dt and lower switching losses with higher quality voltage and current waveforms than the standard two-level inverter [1].Various topologies have been proposed by researchers throughout the years appropriate for different applications such as photovoltaic systems, flexible AC transmission systems (FACTS) devices, drive systems, etc [2]. Three types of these topologies were considered as conventional topologies which are cascade H-bridge (CHB) MLI, neutral point clamped (NPC) MLI and flying capacitors (FC) MLI [3], [4]. These topologies were commercialized and used in different industrial and power system applications, and it created a challenging race to invent new topologies and control schemes and to implement the most advanced control strategies in MLI to produce ultimate inverters for specific applications [5].…”

Section: Introductionmentioning

confidence: 99%

Active voltage balancing strategy of asymmetric stacked multilevel inverter

Kasim

Hassan

2021

IJEECS

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Multilevel inverters (MLI) play an important role in AC applications and are undergoing continuous development in topology and control. In higher levels inverters, conventional MLIs have high components count which calls for modification of these topologies to obtain the same number of levels with fewer components to reduce cost and size. Balancing of the capacitors voltages is crucial for the operation of the MLI and it becomes more challenging in higher levels. This paper presents an active voltage balancing strategy for a reduced switch count five-leve topology which is the asymmetric stacked multilevel inverter (ASMLI). The ASMLI uses fewer components than the conventional MLIs when used in their five-levelconfiguration. The proposed active voltage balancing strategy uses simple measurements and logic to assure a balanced capacitors voltages during steady state and transients. The performance was examined and compared based on two modulation techniques with LCL filter and RL load using MATLAB/Simulink. The results show that the active voltage balancing strategy can trace all capacitors voltages to the reference value simultaneously with less than 1% voltage error, fast dynamic response, and an acceptable total harmonic distortion (THD) which allows the proposed setup to be an available option for medium voltage applications.<br /><div> </div>

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“…Due to its high-quality waveforms and its capability to operate at higher voltages than individual semi-conductors, multilevel converters are attractive for applications in medium or high-voltage levels [5][6][7][8]. More recently, the FCMC is proposed for applications where high-density power and highquality waveforms are required.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the capacitor voltages in flying capacitor multi‐level converters

Escalante

Erdmann

2021

IET Power Electronics

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Flying capacitor multi‐level converters use charged capacitors as a critical element. For proper operation, the capacitor voltages must be known and regulated. Direct measurement is straightforward, but when the number of required measurements is high, this is a complicated approach. This paper introduces an estimation method for n capacitor voltages. The scheme is based on a system of (n+1) equations, which is defined in a way that it incorporates information of the actual capacitor voltages and open‐loop estimates of the capacitor voltages. The solution of the system gives the best estimates of the capacitor voltages in the sense of least square errors. The method requires only output voltage and output current sensors and its computational burden is low, saving cost and design efforts, and simplifying the hardware system. The performance of the proposed scheme is evaluated experimentally in a 9‐level flying capacitor chopper, where the estimates are used by the voltage balancing strategy and by the output current controller.

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Multilevel Converters – Configuration of Circuits and Systems

Cited by 7 publications

References 55 publications

Review of multilevel inverter for high-power applications

Review of multilevel inverter for high-power applications

Active voltage balancing strategy of asymmetric stacked multilevel inverter

Estimation of the capacitor voltages in flying capacitor multi‐level converters

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