Improvement of High-Efficiency Electromagnetic Transient Model Simulation Precision of MMC

doi:10.3969/j.issn.1000-7229.2016.06.008

Abstract

Abstract:

This paper analyzes the mathematical principle of the electromagnetic transient simulation detailed model of modular multilevel converter （MMC） arm based on the Thevenin's equivalent principle. It is found that when the network structure changes caused by fault or switch of breakers during simulation process， the calculation error may be introduced when using trapezoidal integration method because of the mutation of the capacitor current. To solve the problem， this paper proposes a method to eliminate the calculation error through solving the non-state variable after the mutation. We compare the capacitor voltage before and after the elimination of the calculation error at the moment of switch changing in PSCAD/EMTDC， and verify the correctness and validity of the method. Meanwhile， we establish a single-terminal 101-level MMC-HVDC simulation system， whose results verify the correctness of the proposed improved calculation model.

Key words: modular multilevel converter （MMC）, Thevenin's equivalent, trapezoidal integration method, calculation error, simulation precision

CLC Number:

TM 743

GUO Qi， WANG Jiayu， LIN Xuehua， LI Yan， LIU Chongru. Improvement of High-Efficiency Electromagnetic Transient Model Simulation Precision of MMC[J]. Electric Power Construction, 2016, 37(6): 49-54.

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