Recent advances in multilevel converter/inverter topologies and applications

Peng, Fang Zheng; Qian, Wei; Cao, Dong

doi:10.1109/ipec.2010.5544625

Cited by 218 publications

(61 citation statements)

References 87 publications

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“…For high voltage applications, multilevel inverter is more suitable because the inverter output voltage is obtained through a few steps of voltage levels, although it also has some drawbacks. Multilevel system requires a lot of switches and has capacitor voltage unbalanced problem [8]- [11].…”

Section: Introductionmentioning

confidence: 99%

Current Ripple Analysis of New Double-Stator AC Drive Systems

2015

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IntroductionMany studies have been conducted to improve the performance of AC drive system. With advanced progress of the power semiconductor switches, inverters can widely applied as AC drive with high-frequency switching and various levels of power requirements [1]- [4]. Various kinds of AC drive system topology by using an inverter has been researched and developed for a wide variety of applications, such as locomotive traction, electric ship propulsion, more-electric aircraft, and high-power industrial applications. For higher power requirements, multiphase and multilevel inverter is the most commonly used. The multiphase inverter basically consists of conventional n-half bridge inverter connected in parallel corresponding to the load supplies. It provides lower pulsating torque, better tolerance and the possibility of splitting motor current across a higher number of phases, thus reducing the converter rating [3], [5]- [7]. For high voltage applications, multilevel inverter is more suitable because the inverter output voltage is obtained through a few steps of voltage levels, although it also has some drawbacks. Multilevel system requires a lot of switches and has capacitor voltage unbalanced problem [8]- [11].In order to develop better performance of the AC drive system as Figure 1 [22]. On the input side of the inverter, the current ripple determines the size of the DC link capacitor of the inverter. It has been reported that the DC link capacitor is the most vulnerable component in an inverter. Furthermore, on the output side of the inverter, the higher current ripple could cause the motor to heat faster.In this paper, a new topology of double-stator AC drive system is proposed to combine the benefits of both multiphase and multilevel system. In the proposed system, as shown in Figure 2, two conventional two-level three-phase inverters are connected in series on the DC sides. Each three-phase output of these two inverters is supplying three-phase stator winding set of double-stator AC motor. By using the proposed topology, the advantages of simple twolevel inverter topology and high reliability and power density of multiphase AC motors can be combined. Analytical expressions of input and output current ripples of the proposed system are then derived. It is shown that under the same DC input voltages, the output current ripple of the proposed system is lower than the conventional topology. Under the same output voltage, the proposed system has lower input current and therefore, fewer losses on the DC power supply

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Section: Introductionmentioning

confidence: 99%

Current Ripple Analysis of New Double-Stator AC Drive Systems

2015

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“…In order to reach high-voltage and high-power levels, different multilevel converter topologies have been developed in the last years, as shown in [3]. In voltage feed drives applications, reduced harmonic distortion is desired to avoid additional heat losses and, therefore, improve the machine lifetime [4].…”

Section: Introductionmentioning

confidence: 99%

A novel modular multilevel inverter for medium-voltage open-end split winding machines based on single-phase submodules with input-series connection

Ruseler

Lazzarin

Barbi

2015

2015 IEEE 13th Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC)

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In this paper, a modular inverter topology conceived by input series connection of H-bridge (ISHB) is presented and verified trough experimental results. The proposed converter is naturally appropriate for open-end split winding induction motor drive due to the galvanic isolation offered by the machine. Each sub-module is composed by a H-bridge inverter, which is characterized for a modulation with three levels, using phase-shifted PWM modulation strategy. All bus capacitor related to a phase of inverter are connected in series to reach the desired voltage level that is required in high power and high input voltage applications requirements. The proposed structure has a voltage self-balance in the series-connected input capacitors, which provides a stable operating point and ensures proper power distribution between each submodule. A prototype was build in order to validate the theoretical results for a 7.50 kW induction motor, that has three-open winding per phase.

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“…So far in literature no work has been published on STATCOM with this configuration. Some work has been done with regards to investigating the converter structures for high power applications and pulse width modulation and space vector schemes [5][6][7]whilst most of other STATCOM schemes implemented focus mainly on the Cascaded Hbridge MMCC topology [4,8,9].…”

Section: Introductionmentioning

confidence: 99%

Reactive Power Compensation by Modular Multilevel Flying Capacitor Converter-Based STATCOM Using PS-PWM

Efika¹,

Nwobu²,

Zhang³

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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This paper presents a simulation study into the implementation of a modular multi-level flying capacitor converter as a STATCOM. The converter modulation scheme applied is based on Phase Shifted PWM and the two scenarios which require compensation are investigated to verify this topology. The two scenarios are PCC voltage regulation through reactive power compensation and power oscillation damping through reactive current compensation. Simulation results verify the performance of the chosen topology.

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Recent advances in multilevel converter/inverter topologies and applications

Cited by 218 publications

References 87 publications

Current Ripple Analysis of New Double-Stator AC Drive Systems

Current Ripple Analysis of New Double-Stator AC Drive Systems

A novel modular multilevel inverter for medium-voltage open-end split winding machines based on single-phase submodules with input-series connection

Reactive Power Compensation by Modular Multilevel Flying Capacitor Converter-Based STATCOM Using PS-PWM

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