Dynamic interaction between synchronous machine and DC-power-modulated LCC in electromechanical timescale

The Journal of Engineering

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[1] China Electric Power Research Institute (CEPRI), Beijing 100192, People's Republic of China;School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

关键词: eigenvalues and eigenfunctions;    HVDC power convertors;    oscillations;    damping;    HVDC power transmission;    synchronous machines;    DC-power-modulated LCC;    low-frequency oscillation;    synchronous machine;    electromechanical timescale;    active power modulation;    damping effects;    line-commutated converter;    high-voltage direct current system;    HVDC system;    MATLAB-Simulink;    small-signal model;    motion equation concept;   

DOI  :  10.1049/joe.2018.8735

来源: publisher

【 摘 要 】

Active power modulation of line-commutated converter (LCC)-based high-voltage direct current (HVDC) system is increasingly utilised, especially for the case of damping low-frequency oscillation associated with synchronous machine (SM) in electromechanical timescale (around 1 Hz). Many papers have tried to analyse the mechanism of damping effects, but almost rely on numerical studies, which cannot reveal the dynamic interaction between SM and DC-power-modulated LCC. This study proposes a small-signal model of DC-power-modulated LCC based on motion equation concept. With this model, analytical investigation of low-frequency oscillation from the scope of damping and synchronising powers is presented. Comparisons of analytical results and eigenvalues draw some general conclusions which offer insight into the dynamic behaviour. By examining the case of an SM connected to a DC-power-modulated LCC, simulations in MATLAB/Simulink are conducted to verify the analytical results.

【 授权许可】

CC BY