A Reduced Switching Loss PWM Strategy to Eliminate Common-Mode Voltage in Multilevel Inverters

Switching converters are used in electric drive applications to produce variable voltage, variable frequency supply which generates harmful large dv/dt and high-frequency common mode voltages (CMV). Multilevel inverters generate lower CMV as compared to conventional two-level inverters. This paper presents simple carrier-based technique to control the common mode voltages in multilevel inverters using different structures of sine-triangle comparison method such as phase disposition (PD), phase opposition disposition (POD) by adding common mode voltage offset signal to actual reference voltage signal. This paper also presented the method to optimize the magnitude of this offset signal to reduce CMV and total harmonic distortion in inverter output voltage. The presented techniques give comparable performance as obtained in complex space vector-based control strategy, in terms of number of commutations, magnitude, and rate of change of CMV and harmonic profile of inverter output voltage. Simulation and experimental results presented confirm the effectiveness of the proposed techniques to control the common mode voltages.

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Modeling and Analysis of New Multilevel Inverter for Solar Photovoltaic Power Plant

International Journal of Photoenergy ◽

10.1155/2016/4063167 ◽

2016 ◽

Vol 2016 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Xiaoqiang Guo ◽

Ran He ◽

Mehdi Narimani

Keyword(s):

Power Plant ◽

High Voltage ◽

Renewable Energy Sources ◽

Solar Photovoltaic ◽

Common Mode ◽

Modeling And Analysis ◽

Multilevel Inverters ◽

Common Mode Voltage ◽

The Common ◽

And Control

Solar photovoltaic (PV) power plant is an effective way to utilize the renewable energy sources. EMI is one of the major concerns in PV power plant. Typically, the multilevel inverters are used in high voltage PV power plant. However, the conventional multilevel inverters require more semiconductors, which complicate the circuit structure and control algorithm. In this paper, a novel five-level inverter is introduced for the high voltage PV power plant applications. The model of the inverter is analyzed. With the redundant switching states, a new modulation strategy is proposed to reduce the common-mode voltage and EMI. The proposed approach is able to eliminate the common-mode voltage; meanwhile it has the capability of balancing the capacitor voltages. The cosimulation tests with the Matlab/Simulink and S-function are carried out. The results verify the effectiveness of the proposed method.

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Evaluation of Modulation Methods on Switching Loss, Common Mode Voltage and Current Ripple for an Open End Winding Induction Motor Drive

2019 IEEE International Conference on Sustainable Energy Technologies (ICSET) ◽

10.1109/icsets.2019.8745086 ◽

2019 ◽

Author(s):

Greeshma Nadh ◽

S Durga Nai ◽

S Arun Rahul

Keyword(s):

Induction Motor ◽

Motor Drive ◽

Induction Motor Drive ◽

Switching Loss ◽

Common Mode ◽

Common Mode Voltage ◽

Modulation Methods ◽

Open End Winding ◽

Current Ripple

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Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index

Electronics ◽

10.3390/electronics8121400 ◽

2019 ◽

Vol 8 (12) ◽

pp. 1400

Author(s):

Xin Gu ◽

Bingxu Wei ◽

Guozheng Zhang ◽

Zhiqiang Wang ◽

Wei Chen

Keyword(s):

Modulation Index ◽

Voltage Amplitude ◽

Switching Loss ◽

Space Vector Pwm ◽

Space Vector ◽

Common Mode ◽

Medium Voltage ◽

Common Mode Voltage ◽

The Common ◽

Switching State

Aimed at reducing the switching loss and common-mode voltage amplitude of high-power medium-voltage three-level inverter under low modulation index conditions, an improved synchronous space vector PWM strategy is proposed in this paper. The switching times in each fundamental period are reduced by the re-division of small regions and the full use of the redundant switching state. The sum of switching algebra is introduced as an evaluation index and the switching state with the minimum value of the sum of switching algebra are adopted. Then, the common mode voltage amplitude is reduced. The theoretical analysis and experimental results show that the improved modulation strategy proposed in this paper can effectively reduce the switching loss and common-mode voltage amplitude of the inverter under the condition of the low modulation index. Moreover, the neutral-point voltage ripple is also reduced simultaneously.

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