Open AccessModeling and Simulation of ±10 kV DC Transmission System based on Mechanical DC Circuit Breaker
Author(s) -
Jiashuo Cui,
Ke Qin,
Zhisong Long,
Shixin Xiu
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/768/6/062045
Subject(s) - circuit breaker , voltage , power (physics) , control theory (sociology) , transmission system , electric power system , controller (irrigation) , process (computing) , power transmission , dynamic simulation , engineering , computer science , transmission (telecommunications) , electrical engineering , simulation , control (management) , physics , agronomy , quantum mechanics , artificial intelligence , biology , operating system
In order to simulate the interruption process of mechanical DC circuit breaker in actual DC power grid and obtain various stress characteristics of DC circuit breaker in actual interruption process, it is necessary to establish a stable and effective flexible DC system model with good dynamic performance. In this paper, the controller models of system level, converter station level and converter valve level are established for the 10kV flexible DC system, and then the steady-state characteristics and dynamic characteristics of power step of the system are simulated. After analyzing the variation of voltage, current and power and dynamic response speed of converter station, the simulation results show that DC voltage and active power of the system operate stably according to the reference value and the fluctuation error of DC voltage is less than 1%. The internal and external loop controllers all track the dynamic changes of their respective command values rapidly within 0.5s. The control performance of the flexible DC system model can meet the requirement of the interruption simulation of DC circuit breakers.