Open AccessLarge step size electromagnetic transient simulations by matrix transformation‐based shifted‐frequency phasor models
Author(s) -
Ye Xiaohui,
Tang Yong,
Shu Dewu
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2019.1005
Subject(s) - phasor , transient (computer programming) , computer science , stability (learning theory) , frequency band , control theory (sociology) , transformation (genetics) , waveform , grid , scale (ratio) , electronic engineering , electric power system , physics , engineering , mathematics , power (physics) , bandwidth (computing) , telecommunications , control (management) , biochemistry , chemistry , quantum mechanics , artificial intelligence , gene , operating system , radar , geometry , machine learning
To evaluate and improve the performances of control and protection strategies for large‐scale AC grids, simulation models that can adopt a much larger time‐step, provide instantaneous and wide frequency‐band phasor values simultaneously are desirable. However, the traditional electromagnetic transient (EMT) model is numerically expensive and the transient stability (TS) model only preserves low‐frequency dynamics. To resolve these issues, the shifted frequency phasor (SFP) modelling is generalised based on specific matrix transformations and SFP models of typical components in large‐scale AC grids are derived hereafter. Unlike traditional models, the SFP models can produce instantaneous and wide frequency‐band phasor waveforms simultaneously, while the latter matches the envelopes of the former exactly. Moreover, the simulation efficiency is dramatically improved by adopting a much larger time‐step. The performance concerning the accuracy and efficiency is compared with the traditional EMT and TS models by simulating a practical large‐scale AC grid under different scenarios.