[Oral Presentation]Impedance modeling of modular multilevel converter based on multi-harmonic linearization

Impedance modeling of modular multilevel converter based on multi-harmonic linearization

ID：101 Submission ID：1693 View Protection：ATTENDEE Updated Time：2020-10-15 18:45:53 Hits：264 Oral Presentation

Start Time：2020-11-02 11:00 （Asia/Shanghai）

Duration：15min

Session：[B] Power Electronics Technology and Application » [B2] Session 13 and Session 18

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Abstract

Modular Multilevel Converter (MMC) has the advantages of modular design and low AC voltage distortion. Recent studies reported harmonic instability problems in MMC-connected grids. Impedance-based stability criterion has proven to be effective for analyzing harmonic instability, which requires the impedance model of MMC. Based on the review of converter modeling methods, this paper establishes an impedance model of MMC using multi-harmonic linearization method. The modeling focus on the positive sequence. The on-resistance of MMC submodule switches is considered in the modeling of power stage of MMC. The control modeling comprises the modeling of five controls including phase current control, circulating current control, phase-locked loop, active power control as well as reactive power control. Finally, the results obtained by PSCAD simulation confirms that the impedance model is correct in an excellent accuracy.

Keywords

Multi-Harmonic linearization,Impedance modeling,Modular multilevel converter,Harmonic

Speaker

Chang Xiong

School of Electronic Engineering, Xi'an Jiaotong University

Chenbo Xu

Institute of Applied Electronics, China Academy of Engineering Physics；School of Electronic Engineering, Xi'an Jiaotong University

Submission Author

Chang Xiong School of Electronic Engineering, Xi'an Jiaotong University

Zhiyuan Tan Institute of Applied Electronics, China Academy of Engineering Physics

Chenbo Xu Institute of Applied Electronics, China Academy of Engineering Physics；School of Electronic Engineering, Xi'an Jiaotong University

Shaoqi Yu School of Electronic Engineering, Xi'an Jiaotong University

Mengke Lu State Grid Zhejiang Electric Power Co., Ltd.