Performance and Evaluation of Five-Phase Dual Random SVPWM Strategy With Optimized Probability Density Function

Bu, Feifei; Pu, Tianyu; Huang, Wei‐Ping; Zhu, Lin

doi:10.1109/tie.2018.2854570

Cited by 30 publications

(13 citation statements)

References 22 publications

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“…Besides, to output the same PWM signals as those of the asymmetric triangular carrier, the six compare values are necessary for the sawtooth carrier. Based on the asymmetric carrier and the modulation wave, the compare values can be expressed as (17) where ra, rb and rc are the saddle-shaped modulation waves in the [-1, 1]; a1, a2 and a3 are the compare values of the sawtooth carrier in the [0, R], which correspond to the asymmetric carrier in the [0, βmT]; b1, b2 and b3 are the compare value of the sawtooth carrier in the [R, R2], which correspond to the asymmetric carrier in the [βmT , T].…”

Section: Figure 6 Racpwm Principle Based On Sawtooth Carriermentioning

confidence: 99%

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Random Asymmetric Carrier PWM Method for PMSM Vibration Reduction

Hongqiang

2020

IEEE Access

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The underwater noise can be caused by the radial electromagnetic vibration of permanent magnet synchronous motor (PMSM) for electric propulsion. The difficulty in decreasing the underwater noise is not only the high-frequency but also low-frequency vibration reduction. This paper proposes a novel random asymmetric carrier pulse width modulation (RACPWM) method for PMSM vibration reduction in the whole frequency range. Instead of the conventional symmetric triangular carrier PWM, the asymmetric carrier PWM (ACPWM) is used to decrease the low-frequency phase current harmonics and the associated low-frequency vibration. Meanwhile, in order to suppress the high-frequency vibration, the RACPWM control based on the amplitude randomization of the sawtooth carrier is further presented to reduce the high-frequency phase current harmonics. Moreover, the RACPWM is equivalent to the random slope ACPWM in view of the output signals. Furthermore, without the need of any additional circuits in the drive, the presented method is simple to implement by software. Simulation and experimental results show that the proposed RACPWM method can effectively reduce both the low-frequency and the high-frequency vibration. INDEX TERMS Permanent magnet synchronous motor (PMSM), asymmetric carrier, sawtooth carrier, vibration reduction, underwater noise, current harmonics.

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Section: Figure 6 Racpwm Principle Based On Sawtooth Carriermentioning

confidence: 99%

“…In [16], five RPWM strategies, including RZD, RCD, RPP, RSF and VDR, are compared, which shows that RSFPWM has the good performance and lower current total harmonic distortion (THD). In [17], a hybrid dual random SVPWM strategy with the combination of RZD and RSF is applied to a five-phase voltage source inverter.…”

Section: Introductionmentioning

confidence: 99%

Random Asymmetric Carrier PWM Method for PMSM Vibration Reduction

Hongqiang

2020

IEEE Access

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“…M MULTIPHASE machines [1]- [3] have important benefits, which have been discussed in many excellent reviews published recently [4]- [7]. Multilevel multiphase drives combine such benefits with those well-known of the multilevel technology [8].…”

Section: Introductionmentioning

confidence: 99%

“…The SVPWM-R takes advantage of the switching vector redundancy to reduce the switching losses, and to support the accomplishment of complementary tasks like the equal distribution of power losses or the balancing of floating capacitors. Note that advanced modulation issues, like discontinuous modulation, random modulation or overmodulation methods, which have been addressed in multilevel threephase SVPWM [18] and two-level multiphase SVPWM [1], [19], have not been studied in multilevel multiphase SVPWM applications so far. Despite the fact that all the SVPWM techniques in Table I are only defined in the linear region, the multidimensional ones can manage any number of levels, which permits to use the saturation of the output switching vectors as a basic overmodulation method.…”

Section: Introductionmentioning

confidence: 99%

Carrier-Based PWM Equivalent to Multilevel Multiphase Space Vector PWM Techniques

López

Alvarez

Yepes

et al. 2020

IEEE Trans. Ind. Electron.

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The space vector pulse width modulation (PWM) (SVPWM) techniques enhance the performance of multilevel multiphase inverters. With multilevel (threephase) inverters and with (two-level) multiphase inverters, it is widely accepted that the typical SVPWM strategies have an equivalent carrier-based PWM (CBPWM) counterpart, which produces identical results. However, the conclusions reached in the papers that show these cannot be applied, nor even extended, to SVPWM techniques with more than two levels and three phases. This paper shows that the most widely accepted multilevel multiphase SVPWM techniques have a fully equivalent CBPWM counterpart, which consists of a phase disposition PWM (PDPWM) with an appropriate zero-sequence injection scheme. Closed-form expressions to calculate the zero sequences are provided. The proposed modulation techniques are simulated and then implemented in a field-programmable gate array (FPGA), showing that the equivalent CBPWM techniques produce identical results as the original SVPWM ones, but with a significant reduction of hardware requirements. The proposed methodology can be generalized to other multilevel multiphase SVPWM techniques. Index Terms-carrier-based pulse width modulation (PWM) (CBPWM), field-programmable gate array (FPGA), multiphase drive, space vector PWM (SVPWM), voltage source inverter (VSI). NOMENCLATURE Vectors and matrices are printed in bold type while normal type is used for scalars. Lower case is used for normalized variables. Voltages are normalized with respect to the multilevel voltage source inverter (VSI) voltage step V dc and times with respect to the switching period T. Variables related to reduced vectors, i.e., (P − 1)-dimension ones, are written in Greek letters. Superscripts (k) denote the phase, i.e., the vector component, e.g., v r k is the component (phase) k of vector v r. Numeric subscripts (j or m) are used to denote the position of vectors and indexes within a sequence. A hat (v) denotes a vector with its components sorted in descending order.

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“…However, it is often necessary to calculate a set of complex nonlinear equations, resulting in a slow dynamic response. High-frequency modulation technology mainly includes Carrier Phase Shift PWM (CPS-PWM) [14] and carrier Phase Disposition PWM (PD-PWM) [15,16], and voltage Space Vector PWM (SVPWM) [17]; these high frequency modulation methods are generally only adapted to the control of a symmetrical multilevel inverter. The development of ACHB cascade topology puts forward new requirements for the research and improvement of modulation strategy.…”

Section: Introductionmentioning

confidence: 99%

Research on Modified Hybrid Frequency Modulation Technology of Type-III Asymmetric CHB Multilevel Inverters

Ren

Wei

et al. 2020

Electronics

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Asymmetric Cascaded H-bridge (ACHB) level inverters can output more voltage waveforms with fewer cascaded units while ensuring the quality of output voltage waveforms, so they have attracted more and more attention. Taking the topology of Type-III asymmetric CHB multilevel inverters as the research object, a Modified Hybrid Frequency Pulse Width Modulation (MHF-PWM) strategy is proposed in this paper. This modulation strategy overcomes the local overshoot of low-voltage unit in the presence of traditional Hybrid Frequency Pulse Width Modulation (HF-PWM), thus completely eliminating the low frequency harmonics in the output voltage waveform of Type-III ACHB nine-level inverters, and the Total Harmonic Distortion (THD) of output line voltage of the modulation strategy is lower than that of PS-PWM strategy in the whole modulation degree, which effectively improves the quality waveform of the output line voltage. At the same time, the strategy can also improve the problems of current backflow and energy feedback caused by the high-voltage unit pouring current to the low-voltage unit, thereby reducing the imbalance of the output power of the high-voltage and low-voltage units. Finally, the Matlab/Simulink simulation model and experimental platform are established to verify the validity and practicality of the modulation strategy.

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Performance and Evaluation of Five-Phase Dual Random SVPWM Strategy With Optimized Probability Density Function

Cited by 30 publications

References 22 publications

Random Asymmetric Carrier PWM Method for PMSM Vibration Reduction

Random Asymmetric Carrier PWM Method for PMSM Vibration Reduction

Carrier-Based PWM Equivalent to Multilevel Multiphase Space Vector PWM Techniques

Research on Modified Hybrid Frequency Modulation Technology of Type-III Asymmetric CHB Multilevel Inverters

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