Control Schemes for Reducing Second Harmonic Current in Two-Stage Single-Phase Converter: An Overview From DC-Bus Port-Impedance Characteristics

Zhang, Li; Ruan, Xinbo

doi:10.1109/tpel.2019.2894647

Cited by 140 publications

(55 citation statements)

References 58 publications

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“…This work has contributed to an improved PWM technique as an alternative for [10]. Control schemes for further reduction in second harmonic current can be referred to comprehensive studies presented in [11], [12].…”

Section: Simulation Comparisonmentioning

confidence: 99%

An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter

Lee

Siwakoti

Lim

et al. 2020

IEEE Trans. Circuits Syst. II

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A latest common-ground transformerless inverter for photovoltaic (PV) system has demonstrated its superiority over its existing counterpart due to its merits of single-stage structure and voltage boost capability. The exploited modulation scheme, however, led to discontinuous input current that draws high peak current from the source and causes high input power fluctuation in the converter. Such discontinuous and high peak current are detrimental to the PV source. Addressing this concern, this letter proposes a new modulation technique that achieves continuous input current with reduced peak magnitude while in the meantime ensures a good quality ac output voltage. Simulation and experimental results of a laboratory prototype are provided to verify the effectiveness of the proposed modulation technique.

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Section: Simulation Comparisonmentioning

confidence: 99%

An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter

Lee

Siwakoti

Lim

et al. 2020

IEEE Trans. Circuits Syst. II

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“…In this case, low-frequency (LF) power ripples are mitigated by means of the conventional decoupling capacitor C PV . Many other decoupling techniques are available for this purpose [28][29][30][31][32]. The active power decoupling circuits are relevant for consideration in terms of power density improvements, but are still not effective in terms of the cost.…”

Section: Description Of a Case Study System With A Quasi-z-source Invmentioning

confidence: 99%

Feasibility Study of Interleaving Approach for Quasi-Z-Source Inverter

et al. 2020

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This paper presents a comprehensive feasibility study of an interleaving approach for a quasi-Z-source inverter. The state-of-the-art approach revealed that an interleaving approach is often used to improve the efficiency and power density that can overcome the problem of oversized passive elements of quasi-Z-source-based converters. The focus is on the application of the interleaving approach in terms of the comparison of several important parameters of a quasi-Z-source inverter. Our analysis includes losses, capacitor and inductor sizes, as well as semiconductor costs. The theoretical comparison is based on the quasi-Z-source inverter model and the losses model. Simulation and experimental verification of theoretical statements are provided. It was found that a 40% reduction of inductor volume, along with 15–20% of efficiency improvements, are achievable. The results are discussed in the conclusion.

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“…. (16) where vk and v4 are the voltages of port k and port 4, fs is the switching frequency, Ts is the switching period, Lk4 is the equivalent inductance between port k and port 4, and φk4 is phase-shift angle between port k and port 4.…”

Section: Equivalent Circuit Modeling Of the Qab In Pc-petmentioning

confidence: 99%

Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel

Cheng

et al. 2020

IEEE Access

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Power electronic transformer (PET) with modular cascaded structure has become a flexible interface between AC and DC grids. Nonetheless, the notable 2 nd-order ripple power introduced from the AC source requires considerable energy storage in the module capacitors, which is likely to degrade the overall power density and increase system cost. In this paper, a power channel based four-winding PET (PC-PET) is proposed to address such an issue. Owing to the phase-crossing power channels, the low-frequency ripples can cancel each other through magnetic flux counteracting. To improve the accuracy of power decoupling, the effect compromised by inconsistent windings is considered. Accordingly, a proportional-resonant (PR) control based power decoupling strategy for PC-PET incorporated with power balance is proposed to decouple the three-phase low-frequency ripple powers, and minimize the voltage ripple in module capacitors. Additionally, the improvement of power density is discussed based on analyses on power losses, capacitor volume and transformer volume. Simulation and experimental results verified the validity of proposed control strategies.

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Control Schemes for Reducing Second Harmonic Current in Two-Stage Single-Phase Converter: An Overview From DC-Bus Port-Impedance Characteristics

Cited by 140 publications

References 58 publications

An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter

An Improved PWM Technique to Achieve Continuous Input Current in Common-Ground Transformerless Boost Inverter

Feasibility Study of Interleaving Approach for Quasi-Z-Source Inverter

Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel

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