Stability Analysis of a Voltage-Source Converter-based Multi-Infeed High-Voltage Direct-Current Transmission System Connected to Offshore Wind Farms

• Main Authors: JanHenzgen, 邊文軒
• Other Authors: Li Wang
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/5e8q93

碩士 === 國立成功大學 === 電機工程學系 === 105 === This thesis presents the stability-analysis results of a system composed of two offshore wind farms (OWFs) connected to two onshore power grids through a multi-infeed high-voltage direct-current (MI-HVDC) system. The OWFs are based on doubly-fed induction generators (DFIGs), and the MI-HVDC system is based on voltage-source converters (VSCs). With the focus laid on the influence of the common tie line in the MI-HVDC system, small-signal stability and transient stability are analyzed by utilizing system eigenvalues and time-domain simulations, respectively. The simulation results show that a VSC-based MI-HVDC system can be more stable than two VSC-based HVDC links which operate independently from each other. In addition, the stability of the studied VSC-based MI-HVDC link can be significantly influenced by the electrical parameters of the common tie line.