Second-Harmonic Current Reduction for Two-Stage Inverter With Boost-Derived Front-End Converter: Control Schemes and Design Considerations

Zhang, Li; Ruan, Xinbo; Ren, Xiaoyong

doi:10.1109/tpel.2017.2746878

Cited by 129 publications

(42 citation statements)

References 24 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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“…However, interfacing with 230 V ac grids, a commonly used voltage level in Europe, would require dc bus voltages higher than 380 V (e.g., 500 V). Differently, techniques at the converters control level, which are addressed herein, allow to selectively mitigate harmonic currents at the resource side of DER converters in a flexible and effective way without requiring higher dc bus voltages or hardware modifications [18].…”

Section: Introductionmentioning

confidence: 99%

“…However, since notch filters introduce −π/2 phase lag around the characteristic frequency (i.e., 2ω g ), the bandwidth of the voltage loop is limited to be below 2ω g to avoid instability. In order to improve the dynamic performance of converters with low-bandwidth (less than 2ω g ) voltage loops, a load current feedforward path consisting of a notch filter is adopted in [26], and a virtual impedance in parallel with the dc bus capacitor is introduced in [18]. Both the load current feedforward method and the parallel virtual impedance method should be calculated based on the inverse of the converters transfer functions, which complicates the design.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Second-Order Harmonic Current for Droop-Controlled Distributed Energy Resource Converters in DC Microgrids

Liu

Caldognetto

Mattavelli

et al. 2020

IEEE Trans. Ind. Electron.

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Droop-controlled distributed energy resource converters in dc microgrids usually show low output impedances. When coupled with ac systems, second-order harmonics typically appear on the dc-bus voltage, causing significant harmonic currents at the converters resource side. This paper shows how to reduce such undesired currents by means of notch filters and resonant regulators included in the converters control loops. The main characteristics of these techniques in terms of harmonic attenuation and stability are systematically investigated. In particular, it is shown that the voltage control-loop bandwidth is limited to be below twice the line frequency to avoid instability. Then, a modified notch filter and a modified resonant regulator are proposed, allowing to remove the constraint on the voltage loop bandwidth. The resulting methods (i.e., the notch filter, the resonant regulator, and their corresponding modified versions) are evaluated in terms of output impedance and stability. Experimental results from a dc microgrid prototype composed of three dc-dc converters and one dc-ac converter, all with a rated power of 5 kW, are reported.

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Second-Harmonic Current Reduction for Two-Stage Inverter With Boost-Derived Front-End Converter: Control Schemes and Design Considerations

Cited by 129 publications

References 24 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

Suppression of Second-Order Harmonic Current for Droop-Controlled Distributed Energy Resource Converters in DC Microgrids

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