Investigating the Effect of Multilevel Inverters on Motor Stator Insulation Stress

Mirza, Arshiah Yusuf; Nyugen, Hiep; Bazzi, Ali M.; Cao, Yang

doi:10.1109/ecce47101.2021.9595285

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…One problem in the various designed MLIs is the large number of switches and DC sources which increases the cost and the size of the inverter [9]. Another problem arises when the number of levels is small; This increases the THD and causes a large dv/dt stress over the switching devices [10,11].…”

Section: Introductionmentioning

confidence: 99%

17 Level Hybrid Diode Clamped Inverter With Reduced Number of Components

Alsumady,

Jaber,

Nusserat

2023

J. Electron. Electric. Eng.

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Multilevel inverters (MLIs) are gaining more interest recently in medium to high power applications. The main problem with various MLI topologies is that they require a large number of switching devices and DC voltage sources while producing a small number of voltage levels. Which results in bulky inverters with high cost and high output voltage/current total harmonic distortion (THD). This paper introduces a new novel asymmetrical 17-level MLI design using two DC voltage sources and a reduced number of switches. This was achieved by combining a voltage summing and subtracting circuit with a modified diode clamped MLI (DC-MLI), which divides the voltage by two. Thus, generating more voltage levels. nearest level control (NLC) is used to produce the switching signals at a switching frequency of 50Hz. The design is tested and simulated using MATLAB/Simulink, the output voltage THD is kept around 5.7%. The obtained results are compared with other recent 17-level topologies, showing that a good improvement is achieved.

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Section: Introductionmentioning

confidence: 99%

17 Level Hybrid Diode Clamped Inverter With Reduced Number of Components

Alsumady,

Jaber,

Nusserat

2023

J. Electron. Electric. Eng.

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Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality

et al. 2022

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Multilevel Inverters (MLIs) are widely sought after in medium-voltage applications like electric ships, electric aircraft, and renewable energy integration due to excellent advantages like lower device stress, better power quality, and modularity. However, non-sinusoidal excitations from MLIs pose a serious problem to motor-insulation and lead to their premature breakdown. This paper investigates stress in medium-voltage motor insulation when the stator winding is excited by 3-, 5-, and 7-level multilevel inverter output waveforms. The effect of firing angle on insulation stress is also studied for each of the multilevel inverters. Results show that in addition to the number of output voltage levels, PWM wave shape is a critical factor which affects the insulation stress. Both these factors work together to impact the insulation health. A strong correlation is shown between the increase in the voltage root mean square (RMS) value and increase in dielectric stress when ignoring the dv/dt impact for a fixed DC input voltage and operating frequency of the inverter. Similarly, the dielectric stress in the stator insulation increased with an increase in firing angle for each of the MLIs. This paper shows a potential that both the RMSs can be optimized to reduce the insulation stress and improve the power quality of MLIs in medium voltage drives.

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Investigating the Effect of Multilevel Inverters on Motor Stator Insulation Stress

Cited by 2 publications

References 8 publications

17 Level Hybrid Diode Clamped Inverter With Reduced Number of Components

17 Level Hybrid Diode Clamped Inverter With Reduced Number of Components

Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality

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