Optimal Pulsewidth Modulation of a Dual Three-Level Inverter System Operated From a Single DC Link

Boller, Till; Holtz, J.; Rathore, Akshay Kumar

doi:10.1109/tia.2012.2210016

Cited by 59 publications

(25 citation statements)

References 21 publications

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“…1. Taking inverter-1 as an example, the relationship between the switching states and the neutral-point current can be calculated as in (16). (1 abs( )) (1 abs( )) (1 abs( ))…”

Section: Neutral-point Potential Balancingmentioning

confidence: 99%

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A Dual Three-Level Inverter Based Open-end Winding Induction Motor Drive with Averaged Zero-Sequence Voltage Elimination and Neutral-Point Voltage Balance

et al. 2016

IEEE Trans. Ind. Electron.

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Two three-level inverters driving an open-end winding induction motor can generate equivalent voltage waveforms as a single five-level-inverter-based drive. In addition, it can bring in benefits such as reduced dc-link voltage, less number of devices and fault tolerant capability which is favored in high-power motor drive applications. The main challenge with this type of configuration is the appearance of large zero-sequence current circulating between the two inverters, which generates extra losses in the switching devices and the motor as well as affects the normal operation of the machine. Another challenge is to balance the dc-link neutral-point-voltage of the two three-level inverters. This paper has proposed a simplified decoupled space-vector pulse-width-modulation (PWM) strategy to eliminate the averaged zero-sequence voltage in each switching cycle by placement of the redundant vectors of each individual inverter using a time shift. Neutral point voltage balance is further achieved by adjusting the time duration of the redundant vectors. In this paper, it is shown that it is possible to operate this kind of drive configuration with a single dc power supply and achieve averaged zero-sequence voltage elimination and neutral-point voltage balancing at the same time. Experimental results of a 5.5kW dual three-level inverter drive using the proposed PWM strategy are presented, which validates the control method and drive configuration.

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“…1. Taking inverter-1 as an example, the relationship between the switching states and the neutral-point current can be calculated as in (16). (1 abs( )) (1 abs( )) (1 abs( ))…”

Section: Neutral-point Potential Balancingmentioning

confidence: 99%

“…In order to avoid using two isolated dc power supplies, some strategies are proposed. [12,13,16] use chokes to increase zero-sequence impendence to attenuate the zero-sequence current, which inevitably increases the system volume and adds extra losses. With modest choke values, the low-frequency zero-sequence current can not be eliminated.…”

Section: Introductionmentioning

confidence: 99%

A Dual Three-Level Inverter Based Open-end Winding Induction Motor Drive with Averaged Zero-Sequence Voltage Elimination and Neutral-Point Voltage Balance

et al. 2016

IEEE Trans. Ind. Electron.

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“…Therefore, optimization methods are suggested for offline determination of switching angles with goal to minimize the harmonic distortion of output waveforms. SOP technique has been demonstrated for 3L to nine-level (9L) inverters [106]- [111] and also for dual inverter fed open-end winding induction motor drives [112]- [114]. In addition, neutral point potential balancing algorithm in combination with SOP has been demonstrated [115].…”

Section: E Optimal Pwmmentioning

confidence: 99%

“…However, all these methods utilize high device switching frequency and hence will not be preferred for MV high-power applications. Recently, SOP technique has been implemented successfully [113] and it has been enhanced to minimize the zero sequence currents in machine windings for dual 3L inverter topology [114], while limiting the maximum device switching frequencies to 200 Hz. Using first SOP technique, the requirement of common-mode inductor still remains and thus a new SOP technique has been proposed to completely eliminate the common-mode currents [167].…”

Section: Dual Inverter Fed Open-end Stator Winding Induction Motormentioning

confidence: 99%

A Survey of Low Switching Frequency Modulation Techniques for Medium-Voltage Multilevel Converters

Edpuganti

Rathore

2015

IEEE Trans. on Ind. Applicat.

164

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Multilevel converters (MLCs) have emerged as standard power electronic converters for medium voltage high power industrial applications. Owing to dominating device switching losses in high power applications, it is preferable to use low device switching frequency (LDSF) modulation techniques. Then, it is possible to achieve higher device utilization, higher converter efficiency and reduced cooling requirements. However, there exists a trade-off between device switching frequency and harmonic distortion of converter output currents. Therefore, the main challenge for LDSF modulation techniques is to minimize the harmonic distortion of output currents. The goal of this paper is to provide a review of various LDSF modulation techniques proposed in the literature and also discuss in detail about one of the the emerging LDSF control techniques known as synchronous optimal pulsewidth modulation. Finally, challenges to LDSF modulation techniques for emerging multilevel topologies and future trends in applications of MLCs are discussed to motivate further research, to enhance proposed LDSF techniques and to explore for new alternatives.

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“…This paper describes a novel control and modulation strategy, based on OPPs, that enables very fast response times during transients, a fast rejection of disturbances, and a nearly optimal ratio of harmonic current distortion per switching frequency at steady-state operation. These OPPs are computed in an offline procedure by calculating the switching angles over a quarter fundamental period for all possible operating points [1]- [3]. Typically, the objective is to minimize the total harmonic distortion (THD) of the current for a given switching frequency.…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Pulse Pattern Control

Geyer

Οικονόμου

Papafotiou

et al. 2012

IEEE Trans. on Ind. Applicat.

166

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Industrial applications of medium-voltage drives impose increasingly stringent performance requirements, particularly with regard to harmonic distortions of the phase currents of the controlled electrical machine. An established method to achieve very low current distortions during steady-state operation is to employ offline calculated optimized pulse patterns (OPP). Achieving high dynamic performance, however, proves to be very difficult in a system operated by OPPs. In this paper, we propose a method that combines the optimal steady-state performance of OPPs with the very fast dynamics of trajectory tracking control. A constrained optimal control problem with a receding horizon policy, i.e., model predictive control (MPC), is formulated and solved. Results show that the combination of MPC with OPPs satisfies both the strict steady-state as well as the dynamic performance requirements imposed by the most demanding industrial applications. The estimation of the fundamental components of the machine variables separately from their respective harmonic components is not required. As a result, complicated structures such as observers can be avoided, contrary to state-of-the-art methods. A further advantage of the MPC method is the use of a receding horizon policy, which provides feedback and a high degree of robustness.Index Terms-AC motor drives, model predictive control (MPC), optimized pulse patterns (OPPs), pulsewidth modulation, trajectory tracking control.

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Optimal Pulsewidth Modulation of a Dual Three-Level Inverter System Operated From a Single DC Link

Cited by 59 publications

References 21 publications

A Dual Three-Level Inverter Based Open-end Winding Induction Motor Drive with Averaged Zero-Sequence Voltage Elimination and Neutral-Point Voltage Balance

A Dual Three-Level Inverter Based Open-end Winding Induction Motor Drive with Averaged Zero-Sequence Voltage Elimination and Neutral-Point Voltage Balance

A Survey of Low Switching Frequency Modulation Techniques for Medium-Voltage Multilevel Converters

Model Predictive Pulse Pattern Control

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