CONTROL STRATEGY OF MMC POWER ELECTRONIC TRANSFORMER POWERED TO PASSIVE NETWORK UNDER GRID VOLTAGE FAULT

Cheng Qiming; Zhao Miaozhen; Ma Xinqiao; Jiang Chang

doi:10.19912/j.0254-0096.tynxb.2020-0846

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (4) : 121-128. DOI: 10.19912/j.0254-0096.tynxb.2020-0846

Topics on Key Technologies for Safety of Electrochemical Energy Storage Systems and Echelon Utilization of Decommissioned Power Batteries

CONTROL STRATEGY OF MMC POWER ELECTRONIC TRANSFORMER POWERED TO PASSIVE NETWORK UNDER GRID VOLTAGE FAULT

Cheng Qiming, Zhao Miaozhen, Ma Xinqiao, Jiang Chang

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Abstract

Power electronic transformers（PET） have the advantages of instantaneous power regulation and harmonic suppression. Power transmission line to passive networks through PET is an important application field of flexible power transmission. At the same time, the combination of modular multilevel converter（MMC） technology and PET makes it possible to apply PET to high-voltage, large-capacity power transmission and power distribution systems. First of all, under the positive and negative sequences system when the grid fails, this paper derives the passive controller（PBC） of the inner loop positive and negative sequence current based on the Euler-Lagrange（EL） model; Next, applies the MMC technology to the high-voltage side of the MMC-PET isolation stage to improve the power supply reliability of the isolation stage, and adopts a PI-based phase-shift control strategy; then, for the MMC-PET output stage, this paper designs an inner loop current passive controller based on the EL model. Finally, an MMC-PET system that supplies power to the passive network is established in Matlab/Simulink. When the grid voltage fails, software simulation experiments are performed to verify the MMC-PET system that supplies power to the passive network. The experimental results show that the control strategy of the MMC-PET system has good dynamic control performance.

Key words

electric fault / control nonlinearitie / power converter / Euler-Lagrange（EL） mathematical model / power electronic transformer / modular multilevel converter

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Cheng Qiming, Zhao Miaozhen, Ma Xinqiao, Jiang Chang. CONTROL STRATEGY OF MMC POWER ELECTRONIC TRANSFORMER POWERED TO PASSIVE NETWORK UNDER GRID VOLTAGE FAULT[J]. Acta Energiae Solaris Sinica. 2022, 43(4): 121-128 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0846

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