Dynamic-Stability Improvement of a Large-Scale Offshore Wind Farm Using a Superconducting Magnetic Energy Storage Unit

• Main Authors: Shiang-Shong Chen, 陳翔雄
• Other Authors: Li Wang
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/08442058689812900233

博士 === 國立成功大學 === 電機工程學系碩博士班 === 97 === This dissertation presents a control scheme based on a superconducting magnetic energy storage (SMES) unit to achieve both power flow control and damping improvement of a large-scale offshore wind farm connected to a large power grid. The performance of the studied wind farm (WF) is simulated by an equivalent 80-MW induction generator (IG) consisting of forty 2-MW IGs while an equivalent 60-MW IG consisting of thirty 2-MW IGs is employed to study the characteristics of the marine-current farm (MCF). A damping controller for the SMES unit is designed by using modal control theory to contribute effective damping characteristics to the studied WF and the combined WF and MCF under different operating conditions. A frequency-domain approach based on a linearized system model using eigenvalue techniques to designed a damping controller. A time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective to stabilize the studied WF and the combined WF and MCF under various operating conditions. The inherent fluctuations of the injected active power and reactive power of the WF and the combined WF and MCF to the power grid can also be effectively controlled by the proposed control scheme.