Neutral-Point Potential Balancing Control Strategy for Three-Level ANPC Converter Using SHEPWM Scheme

A selective harmonic elimination pulse width modulation (SHEPWM) control strategy is proposed to balance the neutral-point potential (NP) of a three-level active neutral-point-clamped (ANPC) converter. In this strategy, the chaotic ant colony algorithm (ACA) is adopted to solve the SHEPWM nonlinear equations, which does not require presetting the initial values of solutions and can get multiple solutions in the same modulation index. The influence of different solutions corresponding to the SHEPWM switching states on the NP is different, namely, some make the NP increase and others make the NP decrease. Therefore, the NP balancing can be effectively controlled by choosing appropriate solutions in different fundamental periods. The simulation and experimental results further verify the feasibility and effectiveness of the control strategy.

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Selective Harmonic Elimination PWM Method Applied to Three-Level Photovoltaic NPC Inverter

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.614-615.1530 ◽

2012 ◽

Vol 614-615 ◽

pp. 1530-1533 ◽

Cited By ~ 1

Author(s):

Cun Gang Hu ◽

San Shan Liu ◽

Ye Yuan ◽

Hua Zhong Chen

Keyword(s):

Ant Colony Algorithm ◽

Control Method ◽

Linear Equations ◽

Neutral Point ◽

Ant Colony ◽

Multi Objective ◽

Point Potential ◽

Harmonic Elimination ◽

Selective Harmonic Elimination ◽

Non Linear Equations

This paper introduces a selective harmonic elimination (SHE) PWM method based on neutral-point potential balancing applied to a three-level Photovoltaic NPC Inverter. The method combines the SHE with neutral-point potential balancing， and introduces a method based on multi-objective ant colony algorithm to solve the SHE-PWM non-linear equations. SHE-PWM control method of multi-objective ant colony algorithm considering about neutral-point potential balancing, there is no need to solve the initial value of the equation when solving the SHEPWM equations. Experimental results demonstrate the validity of SHE-PWM method based on neutral-point potential balancing.

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Optimization-based open-loop selective harmonic elimination pulse width modulation for multilevel inverter flying capacitor voltage balance considering load power factor variation

Proceedings of the Institution of Mechanical Engineers Part I Journal of Systems and Control Engineering ◽

10.1177/0959651820939342 ◽

2020 ◽

pp. 095965182093934

Author(s):

Faouzi Armi ◽

Lazhar Manai ◽

Mongi Besbes

Keyword(s):

Power Factor ◽

Control Strategy ◽

Pulse Width ◽

Pulse Width Modulation ◽

Open Loop ◽

Multilevel Inverter ◽

Load Power ◽

Harmonic Elimination ◽

Selective Harmonic Elimination ◽

Capacitor Voltage

In this article, Newton–Raphson optimization-based selective harmonic elimination pulse width modulation is investigated for open-loop control of flying capacitor multilevel inverter. Proposed control strategy has allowed giving up current and voltage measurement instrumentations and sensors used in case of closed loop–based control. Proposed control strategy generates accurate switching angles, capable to balance flying capacitor voltage and eliminate lower order harmonics considering load power factor variation. Algorithm performances are verified by simulation and experiments, and obtained results prove that proposed technique does effectively eliminate specific harmonics and balance capacitor voltages while getting inverter output voltage with desired number of levels.

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A Novel SVPWM Algorithm Considering Neutral - Point Potential Balancing for Three - Level NPC Inverter

Electronics ETF ◽

10.7251/els1620069y ◽

2017 ◽

Vol 20 (2) ◽

pp. 69

Author(s):

Chen Yongchao ◽

Li Yanda ◽

Zhao Ling

Keyword(s):

Control Strategy ◽

Pulse Width ◽

Pulse Width Modulation ◽

Sampling Time ◽

Neutral Point ◽

Control Effect ◽

Balance Principle ◽

Imbalance Problem ◽

Point Potential ◽

Three Phase

For three-level inverter, complexity of control strategy and neutral-point potential imbalance problem of DC side is the bottleneck restricting its application. In order to solve the problem, a simplified implementation of three- level space vector pulse width modulation (SVPWM) considering neutral-point potential balancing is proposed in this paper. The proposed SVPWM algorithm is based on judging of three phase voltages and voltage-second balance principle, which does not need to perform the sine and cosine c alculations, and thus it is more convenient and effective than traditional SVPWM algorithm. Also, the neutral-point potential balancing can be realized conveniently and effectively. The proposed algorithm can not only effectively simplify the calculation and reduce calculation time greatly, but also achieve the same control effect as traditional SVPWM. It has certain reference significance and can be used to shorten sampling time and improve the inverter performance. Finally, the proposed SVPWM algorithm is verified by simulation and experimental results.

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