Generalized Theory of Phase-Shifted Carrier PWM for Cascaded H-Bridge Converters and Modular Multilevel Converters

Li, Yufei; Wang, Yue; Li, Ben Q.

doi:10.1109/jestpe.2015.2476699

Cited by 177 publications

(55 citation statements)

References 43 publications

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“…Since h HVPCs are cascaded and a unipolar CPS-SPWM strategy with a particular phase-shift angle of π/h based on a natural-sampling method is employed using a similar Fourier series analysis method to that in [25,26], the output voltages of the front-end H-bridge in Figures 2a and 3 can be obtained as follows:…”

Section: Principle and Methods To Calculate Voltages In Ept Systemmentioning

confidence: 99%

“…At the high-voltage side, h back-to-back H-bridges are cascaded to sustain a high grid phase voltage and three phases are Y-connection with a floating neutral point. Unipolar double frequency sinusoidal pulse width modulation (SPWM) and carrier phase shift (CPS) modulation technology [25] are adopted in the H-bridge rectifier; then 2h kHz equivalent switching frequency can be obtained when the IGBTs work at kHz switching frequency. Note that the voltage reference G in Figure 1b, constructed by three 10 kV potential transformers (PTs), is meant to offer a reference ground for CMV in this paper.…”

Section: Description Of the CMV In A Chb-eptmentioning

confidence: 99%

“…The total error voltage _ of the phase A stack can be obtained by employing the DFIA method in [25]. …”

Section: Effects Of Spwm Dead Time On the CMVmentioning

confidence: 99%

“…where A m,n and B m,n are the Fourier coefficients [25]. Similarly, for phases B and C, the corresponding expression can be obtained by replacing ϕ s with ϕ s ∓ 2 3 π.…”

Section: Effects Of Spwm Dead Time On the CMVmentioning

confidence: 99%

See 3 more Smart Citations

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

Yang¹,

Mao²,

Wang³

et al. 2017

Energies

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Electronic power transformers (EPTs) have been identified as emerging intelligent electronic devices in the future smart grid, e.g., the Energy Internet, especially in the application of renewable energy conversion and management. Considering that the EPT is directly connected to the medium-voltage grid, e.g., a10 kV distribution system, and its cascaded H-bridges structure, the common mode voltage (CMV) issue will be more complex and severe. The CMV will threaten the insulation of the entire EPT device and even produce common mode current. This paper investigates the generated mechanism and characteristics of the CMV in a cascaded H-bridge EPT (CHB-EPT) under both balanced and fault grid conditions. First, the CHB-EPT system is introduced. Then, a three-phase simplified circuit model of the high-voltage side of the EPT system is presented. Combined with a unipolar modulation strategy and carrier phase shifting technology by rigorous mathematical analysis and derivation, the EPT internal CMV and its characteristics are obtained. Moreover, the influence of the sinusoidal pulse width modulation dead time is considered and discussed based on analytical calculation. Finally, the simulation results are provided to verify the validity of the aforementioned model and the analysis results. The proposed theoretical analysis method is also suitable for other similar cascaded converters and can provide a useful theoretical guide for structural design and power density optimization.

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Section: Principle and Methods To Calculate Voltages In Ept Systemmentioning

confidence: 99%

Section: Description Of the CMV In A Chb-eptmentioning

confidence: 99%

“…The total error voltage _ of the phase A stack can be obtained by employing the DFIA method in [25]. …”

Section: Effects Of Spwm Dead Time On the CMVmentioning

confidence: 99%

“…where A m,n and B m,n are the Fourier coefficients [25]. Similarly, for phases B and C, the corresponding expression can be obtained by replacing ϕ s with ϕ s ∓ 2 3 π.…”

Section: Effects Of Spwm Dead Time On the CMVmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

Yang¹,

Mao²,

Wang³

et al. 2017

Energies

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show abstract

“…Researchers analyzed the generalized theory of PS-PWM, which obtains the law of full-range phase-shift angle on harmonic minimization for a cascaded H-bridge [7]. Considered the operation condition, an adaptive modulation method in [8] is proposed to improve the operating characteristics under unbalanced conditions.…”

Section: Introductionmentioning

confidence: 99%

An Improved Modulation Strategy Combining Phase Shifted PWM and Phase Disposition PWM for Cascaded H-Bridge Inverters

Xiao

Ouyang

2017

Energies

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Abstract:Multilevel modulation strategy is an important factor affecting the output performance of multilevel converters. In this paper, the relationship between phase-shifted pulse width modulation (PWM) and phase disposition PWM is analyzed, and then an improved hybrid modulation strategy is proposed for cascaded H-bridge. In addition, the implementation method of multilevel discontinuous modulation for an improved modulation strategy is described. The new modulation strategy is optimized to increase the DC link voltage utilization and further improvement in output harmonics by the injection of a common voltage into the reference. Simulation and experiment verify the effectiveness of the proposed modulation strategy.

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Multilevel Converter‐Based Photovoltaic Power Conversion

Tafti¹,

Konstantinou²,

Pou³

2018

Advanced Multilevel Converters and Applications in Grid Integration

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Generalized Theory of Phase-Shifted Carrier PWM for Cascaded H-Bridge Converters and Modular Multilevel Converters

Cited by 177 publications

References 43 publications

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

An Improved Modulation Strategy Combining Phase Shifted PWM and Phase Disposition PWM for Cascaded H-Bridge Inverters

Multilevel Converter‐Based Photovoltaic Power Conversion

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