Open AccessDamping characteristics of sub‐synchronous torsional interaction of DFIG‐based wind farm connected to HVDC system
Author(s) -
Yu Hongyang,
Zhao Guoliang,
Hu Yunting,
Gao Benfeng,
Zhang Xuewei,
Zhang Ruixue
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0667
Subject(s) - control theory (sociology) , high voltage direct current , induction generator , wind power , rectifier (neural networks) , turbine , electric power system , ac power , controller (irrigation) , transmission system , voltage , engineering , transmission (telecommunications) , power (physics) , direct current , computer science , electrical engineering , physics , control (management) , artificial intelligence , stochastic neural network , recurrent neural network , biology , quantum mechanics , machine learning , artificial neural network , agronomy , mechanical engineering
High‐voltage direct current (HVDC) transmission system is one of the preferred ways to evacuate large amounts of wind power over a long distance. Since the constant current controllers at HVDC rectifier stations may introduce negative damping on the nearby generating units, it is therefore vital to investigate the potential of sub‐synchronous torsional interaction between wind turbine generator units and HVDC system over a frequency range of interest. This study investigates the damping characteristics of doubly‐fed induction generator (DFIG)‐based wind farm connected to the HVDC system by complex torque coefficient method. A typical model of DFIG‐based wind farm interconnected to a CIGRE HVDC benchmark system is built. In order to avoid the influence of the higher harmonics of the switching devices on the electrical damping results, the equivalent simulation model of AC controlled voltage source and DC controlled current source of DFIG converter is established. Impacts of operating points of the wind farm, AC network strength and parameter settings of the HVDC controller on the electrical damping are studied. It is found that there is no obvious interaction between the DFIG‐based wind farm and the HVDC system, but the damping will get worse with the wind farm scale increasing and the AC network strength weakened. The results are validated by detailed time‐domain simulation through PSCAD/EMTDC.