Multiphase optimal injection PWM with dual carrier frequency to reduce current THD

Chen, Keng-Yuan; Xie, Yu-Lin

doi:10.1049/iet-pel.2016.0437

Cited by 14 publications

(8 citation statements)

References 27 publications

(68 reference statements)

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“…In the previous section, it has been shown that the three formulas (4), (9), and (11) can be used for keeping the average AC capacitor charge constant through 60° Flat-Top transitions. The actual algorithm using these formulae can be designed based on Figs.…”

Section: Compensation Algorithmmentioning

confidence: 99%

“…6 and 9, ΔD 2 correction is added to the same phase leg duty ratio for type 2 transitions both before and after the transition, but the direction of the correction (sign) is different. As the compensation has been calculated for positive zero-sequence steps in (9) and (11), the sign of ΔD 1 also needs to be inverted for negative zero-sequence steps shown in Table 1.…”

Section: Compensation Algorithmmentioning

confidence: 99%

“…Similar schemes have been investigated for other topologies as well. A five‐phase version of all six DPWM methods has been analysed in [8], and the usage of DPWM methods for more than five phases is investigated in [9]. Vienna rectifiers can take advantage of the original 60° Flat‐Top (DPWM1) waveforms as well [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical compensation of harmonics caused by 60° flat‐top modulation

Futo

Varjasi

Vajk

et al. 2019

IET Power Electronics

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The 60° Flat-Top PWM modulation method (also called DPWM1, two-phase, or 60° bus-clamp) is widely used by the industry to reduce switching losses in three-phase inverters by connecting one of the three-phase legs to the positive or the negative DC rail continuously for 60°of the fundamental period. It is widely known that-compared to the most used SVM modulation-the Flat-Top modulation increases switching frequency current components. The actual amount is highly dependent on the modulation index. It is a lesser known fact that-at each switch-over happening at every 60°, because of the change of the phase in the switching frequency current component-low-order harmonics are produced as well. The effect of these can become especially significant, if one of the produced frequencies falls near to the resonant frequency of the LC or LCL filter. A modification of the original Flat-Top method has been developed, that corrects the duty ratios around the edges of the zero-sequence voltage signal. This way the filtered output voltage remains sinusoidal, while keeping the efficiency advantage of the Flat-Top. Experimental results on two different inverters show that the novel method significantly decreases the current THD. Fig. 1 Three-phase two-level VSI with low pass filter for grid connected or stand-alone operation. The filtering capacitors are shown in delta connection

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Section: Compensation Algorithmmentioning

confidence: 99%

Section: Compensation Algorithmmentioning

confidence: 99%

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Analytical compensation of harmonics caused by 60° flat‐top modulation

Futo

Varjasi

Vajk

et al. 2019

IET Power Electronics

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show abstract

“…The high-frequency harmonics will cause current waveform distortion, motor heating, motor vibration, efficiency decrease and degradation of the control performance. More importantly, since the carrier frequency is usually at the range between 2 and 20 kHz, which overlaps with the human ear audible range, the noise induced by carrier frequency harmonics is a restriction for SVPWM application, such as elevators or electric vehicles [13]. Increasing the switching frequency will lead to a lower size of inductance and capacitance, which will lead to a size reduction in the control board while it means higher switching loss and more expensive switching elements.…”

Section: Introductionmentioning

confidence: 99%

Carrier frequency harmonic suppression in dual three‐phase permanent magnet synchronous motor system

Zheng

Wang

et al. 2019

IET Electric Power Applications

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Dual three-phase permanent magnet synchronous motor (PMSM) is a major area of interest within the field of motors since it inherits the advantages of both the PMSM and multiphase machines. While dual three-phase PMSM (DTP-PMSM) system has a more severe carrier frequency harmonic problem due to the low impedance in the harmonic subspace, which will not only decrease the efficiency but also produce the high-frequency audible noise. This study proposes an improved space vector pulse-width modulation (SVPWM) strategy by changing the sequence of the pulse-width modulation wave. The improved SVPWM strategy with a 10 kHz carrier frequency has the same effect as the conventional SVPWM with a 20 kHz carrier frequency, which will significantly decrease the switching loss, lead to lower size of inductance, capacitance and eliminate the high-frequency audible noise. Three existing mainstream SVPWM strategies in DTP-PMSM system are introduced and the proposed strategy can be used in them without affecting their original advantages. The switching times are also minimised to reduce the switching loss. The theoretical derivation is proposed to prove the harmonic suppression ability of the proposed SVPWM and the implementation procedure is given then. The simulation and experimental results proved the effectiveness of the strategy.

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“…It can be evidently investigated that, the space vector pulse width modulation (SVPWM) is the most widely applied scheme. SVPWM has attractive flexibility for optimizing switching waveforms and is convenient to implement on embedded processors [10,11], as well as its operational advantages over carrier-based techniques (i.e., low total harmonic distortion, high efficiency and voltage available in the DC-link) [12].…”

Section: Introductionmentioning

confidence: 99%

Optimal Modeled Six-Phase Space Vector Pulse Width Modulation Method for Stator Voltage Harmonic Suppression

et al. 2018

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Dual Y shift 30 • six-phase motors are expected to be extensively applied in high-power yet energy-effective fields, and a harmonic-suppressing control strategy plays a vital role in extending their prominent features of low losses and ultra-quiet operation. Aiming at the suppression of harmonic voltages, this paper proposes a six-phase space vector pulse width modulation method based on an optimization model, namely OM-SVPWM. First, four adjacent large vectors are employed in each of 12 sectors on a fundamental sub-plane. Second, the optimization model is constructed to intelligently determine activation durations of the four vectors, where its objective function aims to minimize the synthesis result on a harmonic sub-plane, and its constraint condition is that the synthesis result on the fundamental sub-plane satisfies a reference vector. Finally, to meet the real-time requirement, optimum solutions are obtained by using general central path following algorithm (GCPFA). Simulation and experiment results prove that, the OM-SVPWM performs around 37% better than a state-of-the-art competitive SVPWM in terms of harmonics suppression, which promise the proposed OM-SVPWM conforms to the energy-effective direction in actual engineering applications.Energies 2018, 11, 2598 2 of 16 As a prominent MMDS, dual Y shift 30 • six-phase motor (DYSM) has gained widespread attention and representative application in high-power yet energy-effective fields, such as electric locomotive traction, ship electric propulsion, wind power generation, etc. [4][5][6]. The stator of a DYSM has an irregular but delicate structure. As shown in Figure 1, the asymmetric six-phase windings of a DYSM are constructed with two sets of three-phase windings, which are arranged with a 30 • spatial electrical angle displacement. This special structure brings the following three typical advantages:(1) With the asymmetric six-phase winding, lower-order harmonic components of the magnetic motive force can be effectively eliminated; (2) With double the number of winding phases, higher power can be transmitted on the same voltage or current level; (3) Continuous operating of DYSMs under phase-deficient conditions is possible. These advantages are highly beneficial to green power and sustainable energy-saving.

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Multiphase optimal injection PWM with dual carrier frequency to reduce current THD

Cited by 14 publications

References 27 publications

Analytical compensation of harmonics caused by 60° flat‐top modulation

Analytical compensation of harmonics caused by 60° flat‐top modulation

Carrier frequency harmonic suppression in dual three‐phase permanent magnet synchronous motor system

Optimal Modeled Six-Phase Space Vector Pulse Width Modulation Method for Stator Voltage Harmonic Suppression

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