Fast Electromagnetic Transient Model of Modular Multilevel Converter Based on Rotation Transformation

To address the limited speed and scale of the simulation of modular multilevel converter (MMC) in electromagnetic transient simulation program (EMTP), this paper put forward a MMC fast electromagnetic transient model based on rotation transformation. The crucial advantage of the rotation transformat...

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Bibliographic Details
Published in2018 International Conference on Power System Technology (POWERCON) pp. 2571 - 2577
Main Authors Shujun, Yao, Wenerda, Huang, Yanmeng, Cai, Guangyang, Zhou, Chang, Liu
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2018
Subjects
Analytical models
Bridge circuits
Computational modeling
Electromagnetic transients (EMT) simulation
fast simulation
Harmonic analysis
Mathematical model
modular multilevel converter (MMC)
Power system dynamics
rotation transformation
Switches
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Summary:To address the limited speed and scale of the simulation of modular multilevel converter (MMC) in electromagnetic transient simulation program (EMTP), this paper put forward a MMC fast electromagnetic transient model based on rotation transformation. The crucial advantage of the rotation transformation is to reduce the fundamental frequency of the original signal via the rotation transformation of coordinate system. With proposed method implemented in the EMTP of MMC, the simulation step size can be relatively increased, and the fast electromagnetic transient simulation can be achieved. In this paper, the equivalent model of MMC switch function model expressed by the state equation is derived. Based on this, the novel MMC model based on rotation transformation is further derived combined with the concept of rotation transformation. Then, the state equation of proposed novel MMC model is calculated in Matlab, and the simulation results and simulation time-consuming are compared with which of 51-level topological MMC electromagnetic transient model established in PSCAD/EMTDC. The results of comparative analysis show that the simulation duration of the MMC model based on rotation transformation is far less than the traditional MMC electromagnetic transient model without sacrificing accuracy.
DOI:10.1109/POWERCON.2018.8602316