Optimized space vector switching sequences for multilevel inverters

McGrath, Brendan; Holmes, D.G.; Lipo, T.Α.

doi:10.1109/tpel.2003.818827

Cited by 460 publications

(222 citation statements)

References 11 publications

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“…jI -j = I 0 + k=3, 5,7 ∑ I mk sin(kωt + β k ) (19) Then the current vector turning with frequency ω is equal (20) and its projection to real axis, i.e. current of phase A, is …”

Section: The Model Of Inverter and Assessment Of The Conversion Qualitymentioning

confidence: 99%

“…Therefore, different sequences or algorithms of base vectors formation within the modulation period lead to different trajectories of current vector and different ripples. The effect of the choice of sequence of base vectors forming on the current (flux linkage) ripples during transitions of modulation vector across the segment borders is considered in [19,20]. However, the kind and magnitude of ripples depends not only on voltage jumps at the boundaries, but also on the algorithm (sequence) of vectors forming within segments.…”

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confidence: 99%

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The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes

Tomasov¹,

Усольцев²,

Zolov³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The effect of space vector modulation algorithm on magnitude of current vector ripples was considered on the mathematical model of a three-level three-phase voltage inverter with symmetric active inductive load. Limitations on the use of such inverters as a power supply for precision drive of optical telescopes were specified.Key words: multilevel inverter, space vector modulation, modulation algorithm, current ripples, precision AC drive.The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes V. TOMASOV * , A. USOLTSEV, P. ZOLOV, and P. GRIBANOV ITMO University, 49 Kronverksky Pr., St. Petersburg, 197101, Russia viding the modulation period into two or three equal time intervals, within which the base vectors bounding 60-degree sector containing the modulation voltage vector are formed [16][17][18]. Thus, the number of base "vectors" increases to 12 and 56, accordingly. But it significantly complicates the control system. Eventually, VSI of AC drive must form a circular hodograph of stator flux linkage, or, equivalently, of stator current, in steady state mode. The trajectory of stator current vector between adjacent commutations of inverter switches is determined by the attitude and magnitude of active voltage base vector. Therefore, different sequences or algorithms of base vectors formation within the modulation period lead to different trajectories of current vector and different ripples. The effect of the choice of sequence of base vectors forming on the current (flux linkage) ripples during transitions of modulation vector across the segment borders is considered in [19,20]. However, the kind and magnitude of ripples depends not only on voltage jumps at the boundaries, but also on the algorithm (sequence) of vectors forming within segments. Moreover, the number of algorithms excluding redundancy of base vectors for threephase VSI is six.This work covers the investigation of effect of modulation algorithm on current ripples in the load of the inverter. Threelevel inverter was selected as an object of study, as it most clearly demonstrates this effect in different operation modes. At the same time, the findings may be extended to inverters with more levels, as well as to two-level inverters. Moreover, during deep control, which is needed to achieve ultra low velocities of the drive, current formation operates on two or three-level mode, regardless of the total number of levels of VSI. At the same time, rotating EMF is close to zero, and motor becomes active inductive load for the inverter. Therefore, symmetric RL-circuit was used as the load. Base vectors plane of three-phase inverterAll possible states of three-phase inverter output voltage can be represented as vectors, ends of which are placed at the sides

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“…jI -j = I 0 + k=3, 5,7 ∑ I mk sin(kωt + β k ) (19) Then the current vector turning with frequency ω is equal (20) and its projection to real axis, i.e. current of phase A, is …”

Section: The Model Of Inverter and Assessment Of The Conversion Qualitymentioning

confidence: 99%

mentioning

confidence: 99%

The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes

Tomasov¹,

Усольцев²,

Zolov³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…In order to select the right switching sequences, the leg voltage transitions between sub-sectors should be minimised, consequently minimising the switching losses [16]. Furthermore, it is desirable to have more than one output leg connected to the neutral point, Mp i.e.…”

Section: Potential Switching Sequences Optimisationmentioning

confidence: 99%

Space vector PWM technique for a three-level six-phase drive

Ariff

Dordevic

Jones

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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A space vector pulse-width modulation (SVPWM) strategy for a three-level six-phase drive based on vector space decomposition (VSD) approach is presented for the first time in this paper. The steps, requirements and conditions in determining the right switching sequences for the proposed modulation strategy are explained in detail. The developed SVPWM strategy is then simulated in Matlab/Simulink while driving a symmetrical six-phase induction machine running at no load. Obtained results prove the validity of the algorithm.

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“…Therefor many efforts have been made to achieve the SVPWM's performance by using zero-sequence voltage injection in carrier-based PWM [12]-[16]. Relationship between space vector and phase disposition carrier modulation is presented in [17] This paper summarizes the five different SVPWM algorithms for multilevel inverters which are α-β frame, g-h frame, K-L frame, α'-β' frame and SVPWM based on imaginary coordinate system. The complex calculations of conventional SVPWM are converted into simplified line voltages form and the results are compared for all aforementioned algorithms.…”

Section: Introductionmentioning

confidence: 99%

A Survey on Space-Vector Pulse Width Modulation for Multilevel Inverters

Qamar

Wang

2017

CPSS TPEA

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Abstract-The selection of an appropriate modulation scheme plays a vital role to assure the performance of multilevel inverters. Space vector pulse width modulation (SVPWM) is more efficient among all other pulse width modulation (PWM) techniques due to its key characteristics like better DC voltage utilization, switching losses reduction and easiness in digital implementation. The conventional SVPWM scheme presents some computational complexities due to redundant switching states and large number of space vectors. This paper summarizes five different SVPWM techniques for multilevel inverters which are α-β frame, g-h frame, K-L frame, α'-β' frame and SVPWM based on imaginary coordinate system. g-h frame and K-L frame are based on 60° and 120° coordinates system respectively. To compare the result of these SVPWM schemes, the complex calculations of conventional SVP-WM are converted into simplified line voltages form. The comparison results validate all the SVPWM techniques, but the SVPWM based on imaginary coordinate is found more simple in duty ratio calculations, easier to understand and provides a better control for zero-sequence component for any level of inverter.Index Terms-g-h frame, imaginary coordinate system, K-L frame, multilevel inverters, space vector pulse width modulation (SVPWM), α'-β' frame. I. IntroductIonN OWADAYS, the extensive use of multilevel inverters in high power and high voltage applications has made it a point of attraction for the researchers because of their remarkable performance. As compared with two-level inverters, multilevel inverters have various advantages, e.g. less harmonics in output current and voltages, reduced voltage stress across switching devices, lower dv/dt, better output wave form quality and lower common mode voltages [1], [2]. The diode-clamped 3 level neutral-point clamped (NPC) topology, as shown in Fig. 1 has been the most widely used one among all multilevel inverter topologies that have been proposed in literature [3]- [5].By using an appropriate PWM technique, from discrete voltage levels, multilevel inverters generate the sinusoidal output voltages of different frequencies. Multilevel inverter's output performance depends on modulation algorithm and various PWM algorithms have been developed so far to fulfill the following objectives: less total harmonic distortion (THD), wider linear modulation range, lower switching losses and easy implementation. Among these, the two most popular PWM generation algorithms for multilevel inverters are sinusoidal carrier-based PWM (SPWM) and space vector PWM (SVPWM). In engineering applications, SPWM algorithms maintained their credibility for a long period [6]-[10] but with the development of microcontrollers, SVPWM took place due to its easy digital implementation, better harmonics performance, high DC voltage utilization ratio, reduced switching losses and convenience for capacitor voltage balancing. Moreover, the SVPWM has 15% higher linear modulation range than that of SPWM [11]. However, by increasing the number of...

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Optimized space vector switching sequences for multilevel inverters

Cited by 460 publications

References 11 publications

The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes

The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes

Space vector PWM technique for a three-level six-phase drive

A Survey on Space-Vector Pulse Width Modulation for Multilevel Inverters

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