Study on Fault Analysis and Transient Performance Improvement of Wind Generation System

• Main Authors: Jhong- Sian Jian, 簡仲賢
• Other Authors: Hung-Cheng Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/53836468440764400279

碩士 === 國立勤益科技大學 === 電機工程系 === 98 === With the rapid increase in penetration of the wind power in power system, wind power has become a source of power supply. In the past, in order to ensure the safety of wind turbine generator, wind turbine generators have to be tripped with the grid even minor power failure occurred. However, with the wind power increased in power supply, tripping of many wind turbine generators in a large wind farm during grid faults may influence the overall power system stability. The power system will lose the ability to support voltage on the grid. It is necessary for wind turbine generator to be capable of low voltage ride through (LVRT) to avoid wind power generation park disconnection during grid voltage dips. This thesis investigates the wind turbine generators connected in parallel to the power system. The static synchronous compensator (STATCOM) and current-limiting reactor (CLR) devices are installed between the power system and wind turbine generators. Using these two devices to improve the transient voltage stability and help the wind turbine generator system to remain in service during faults. The MATLAB/Simulink software is used to model the wind, wind turbine, doubly-fed induction generator, and its controllers. Simulation results obtained from the model are used to analyze the effects of different wind speed fluctuation on system dynamic responses. Moreover, the STATCOM and the current-limiting reactors are incorporated to improve the voltage of wind turbine generator during the three-phase ground fault. From the simulation results we find that these two compensation devices have the ability to enhance the low voltage ride through of wind turbine generators. Finally, the Chang Kong Wind Farm in Changhua county is investigated to observe the response of the two compensation added at different positions of the system.