Open AccessAnalysis of the HVDC grid's influence on short‐circuit current level of AC system
Author(s) -
Li YingBiao,
Wang ShanShan,
Bu GuangQuan,
Yang YanChen,
Zhao Bing,
Wang TieZhu
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0700
Subject(s) - short circuit , transient (computer programming) , current (fluid) , modular design , controller (irrigation) , short circuit ratio , voltage , computer science , control theory (sociology) , grid , process (computing) , equivalent circuit , power (physics) , electrical engineering , electronic engineering , engineering , control (management) , physics , led circuit , mathematics , geometry , agronomy , quantum mechanics , artificial intelligence , biology , operating system
Short‐circuit current characteristics of modular multilevel converter (MMC) have been studied here. First of all, this study introduces the principle of MMC. Furthermore, the injection short‐circuit current characteristics of MMC are analysed. There are two stages of the short‐circuit current. The first is transient process. This stage is the controller response process. After the controllers working, the voltage output by the MMC would have a big change, and there is no DC component in the short‐circuit current anymore. The second is steady‐state stage. The size of short‐circuit current is related to the control schemes, operation mode, and control parameters of MMC. Through comparison with and analysis of the testing results on a typical system, it is shown that the proposed characteristics are accurate. The research result offers a reference of construction of power grid.