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A Virtual Negative Resistor Based Common Mode Current Resonance Suppression Method for Three-Level Grid-Tied Inverter with Discontinuous PWM

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  • Qiyu Li

    (School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    TBEA Xi’an Electric Technology Co., Ltd., Xi’an 710119, China)

  • Hongwei Zhou

    (TBEA Xi’an Electric Technology Co., Ltd., Xi’an 710119, China
    School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Jiansong Zhang

    (School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Shengdun Zhao

    (School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Jingfeng Lu

    (TBEA Xi’an Electric Technology Co., Ltd., Xi’an 710119, China)

Abstract

The output LC filter of a photovoltaic (PV) string three-level grid-tied inverter that connects the filter capacitor neutral point to dc-link capacitor neutral point can reduce the common-mode (CM) current injected to the grid by letting the CM current circulate within the inverter. However, the internal CM current may resonate because of the existence of the resonant frequency of the internal CM LC circuit. Compared with the traditional continuous pulse-width modulation (CPWM), the resonance can be worse if discontinuous pulse-width modulation (DPWM) is applied, for the zero sequence quantity of DPWM contains more harmonics than that of CPWM. In this paper, a virtual negative resistor based common mode current resonance suppression method for a three-level grid-tied inverter is proposed to overcome the CM current resonance problem in DPWM application. Different positions of the virtual negative resistor in the equivalent CM circuit with different feedback variables are analyzed theoretically. The virtual negative resistor connected in series with the inductor in the equivalent CM circuit is selected to damp the CM current resonance for simplification and damping performance. Different from the implementation in CPWM where a pair of small voltage vectors exist and are used to adjust the CM voltage directly, the proposed method for DPWM application is implemented indirectly by adding the CM adjustment quantity to differential-mode (DM) control quantity with appropriate coefficients. Depending on the sector of DM control quantity in the α β reference frame, the coefficients are calculated using one of three specific voltage vectors. Experimental results are given to demonstrate the effectiveness of theoretical analyses and the proposed method.

Suggested Citation

  • Qiyu Li & Hongwei Zhou & Jiansong Zhang & Shengdun Zhao & Jingfeng Lu, 2020. "A Virtual Negative Resistor Based Common Mode Current Resonance Suppression Method for Three-Level Grid-Tied Inverter with Discontinuous PWM," Energies, MDPI, vol. 13(7), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1595-:d:339806
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    References listed on IDEAS

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    2. Hassaine, L. & OLias, E. & Quintero, J. & Salas, V., 2014. "Overview of power inverter topologies and control structures for grid connected photovoltaic systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 796-807.
    3. Gomes, Camilo C. & Cupertino, Allan F. & Pereira, Heverton A., 2018. "Damping techniques for grid-connected voltage source converters based on LCL filter: An overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 116-135.
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