Implementation of a closed loop SHMPWM technique for three level converters

Nápoles, J.; Portillo, R.; Leon, Jose I.; Aguirre, M.A.; Franquelo, Leopoldo G.

doi:10.1109/iecon.2008.4758482

Cited by 24 publications

(18 citation statements)

References 15 publications

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“…In this paper, four power quality standards (EN 50160 [4], CIGRE WG 36-05 [5], IEC 61000-3-6 [6], and IEC 61000-2-12 [7]) are considered for the proposed SHM-PWM method. The selected grid codes in this paper are more intransigent than those in previous works [12], [17], [23], [24]. Moreover, IEC 61000-3-6 and IEC 61000-2-12 are known as international power quality standards.…”

Section: ) Selective Harmonic Elimination-pwm (She-pwm) 2) Selectivmentioning

confidence: 84%

“…Recently, a new optimal modulation technique (SHM-PWM) has been introduced which tries to mitigate low order harmonics, instead of complete elimination of low order harmonics, from the output waveform [23], [24]. In this method, a higher number of harmonics can be considered compared to the SHE-PWM method.…”

Section: ) Selective Harmonic Elimination-pwm (She-pwm) 2) Selectivmentioning

confidence: 99%

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Non-equal DC link Voltages in a Cascaded H-Bridge with a Selective Harmonic Mitigation-PWM Technique Based on the Fundamental Switching Frequency

Moeini¹,

Iman‐Eini²,

Najjar³

2017

Journal of Power Electronics

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In this paper, the Selective Harmonic Mitigation-PWM (SHM-PWM) method is used in single-phase and three-phase Cascaded H-Bridge (CHB) inverters in order to fulfill different power quality standards such as EN 50160, CIGRE WG 36-05, IEC 61000-3-6 and IEC 61000-2-12. Non-equal DC link voltages are used to increase the degrees of freedom for the proposed SHM-PWM technique. In addition, it will be shown that the obtained solutions become continuous and without sudden changes. As a result, the look-up tables can be significantly reduced. The proposed three-phase modulation method can mitigate up to the 50th harmonic from the output voltage, while each switch has just one switching in a fundamental period. In other words, the switching frequency of the power switches are limited to 50 Hz, which is the lowest switching frequency that can be achieved in the multilevel converters, when the optimal selective harmonic mitigation method is employed. In single-phase mode, the proposed method can successfully mitigate harmonics up to the 50th, where the switching frequency is 150 Hz. Finally, the validity of the proposed method is verified by simulations and experiments on a 9-level CHB inverter.

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Section: ) Selective Harmonic Elimination-pwm (She-pwm) 2) Selectivmentioning

confidence: 84%

Section: ) Selective Harmonic Elimination-pwm (She-pwm) 2) Selectivmentioning

confidence: 99%

Non-equal DC link Voltages in a Cascaded H-Bridge with a Selective Harmonic Mitigation-PWM Technique Based on the Fundamental Switching Frequency

Moeini¹,

Iman‐Eini²,

Najjar³

2017

Journal of Power Electronics

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“…The commonly used special synchronous modulation methods can be divided into two categories. The first class includes synchronous optimal modulation techniques, such as SHE-PWM (selective harmonic elimination-pulse width modulation) [3], [4]. The other class is made up of non-optimized special synchronous modulation techniques, such as central 60° synchronous modulation [5], [6].…”

Section: Introductionmentioning

confidence: 99%

An Improved Central 60° Synchronous Modulation for High Transient Performance with PMSM Stator Flux Control Used in Urban Rail Transit Systems

Fang¹,

Lin²,

Yang³

2016

Journal of Power Electronics

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Central 60° synchronous modulation is an easy pulse-width modulation (PWM) method to implement for the traction inverters of urban rail trains at a very low switching frequency. Unfortunately, its switching patterns are determined by a Fourier analysis of assumed steady-state voltages. As a result, its transient responses are not very good with over-currents and high instantaneous torque pulses. In the proposed solution, the switching patterns of the conventional central 60° modulation are modified according to the dynamic error between the target and actual stator flux. Then, the specific trajectory of the stator flux and current vector can be guaranteed, which leads to better system transients. In addition, stator flux control is introduced to get smooth mode switching between the central 60° modulation and the other PWMs in this paper. A detailed flow chart of the control signal transmission is given. The target flux is obtained by an integral of the target voltage. The actual PMSM flux is estimated by a minimum order flux state observer based on the extended flux model. Based on a two-level inverter model, improved rules in the α-β stationary coordinate system and equations of the switching patterns amendment are proposed. The proposed method is verified by simulation and experimental results.

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“…It only presents problems when a high dynamic response of the system is needed what is not usually required in very high power applications. However, some recent works deal with this concern [19].…”

Section: Multilevel Modulationmentioning

confidence: 99%

New trends and topologies for high power industrial applications: The multilevel converters solution

Franquelo

Leon

Domínguez

2009

2009 International Conference on Power Engineering, Energy and Electrical Drives

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Abstract-This paper reviews briefly the current scenarios where power electronics converters are being applied. In the paper, the main focus moves towards the high power applications, reviewing the different alternatives and topologies. The multilevel approach is studied in more depth, showing that is a good solution to the challenges that medium voltage-high power applications pose. Several industry examples are introduced and the most suitable modulation techniques for multilevel high power converters are explained. Among them, the recent selective harmonic mitigation method appears as a good solution to achieve a high performance. Finally the conclusions are addressed.

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Implementation of a closed loop SHMPWM technique for three level converters

Cited by 24 publications

References 15 publications

Non-equal DC link Voltages in a Cascaded H-Bridge with a Selective Harmonic Mitigation-PWM Technique Based on the Fundamental Switching Frequency

Non-equal DC link Voltages in a Cascaded H-Bridge with a Selective Harmonic Mitigation-PWM Technique Based on the Fundamental Switching Frequency

An Improved Central 60° Synchronous Modulation for High Transient Performance with PMSM Stator Flux Control Used in Urban Rail Transit Systems

New trends and topologies for high power industrial applications: The multilevel converters solution

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