Improvement of Low-Voltage-Ride-Through Capability for Doubly Fed Induction Generator by Reactive Power Compensation

• Main Authors: Wei-Shiun Chen, 陳韋勳
• Other Authors: Pei-Hwa Huang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/36866930419163646783

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 101 === In recent years, with the proportion of wind energy in total system generation being rapidly increasing, the Doubly-Fed Induction Generator has been widely adopted in wind power generation. With more generation from the onshore and offshore wind farms and thus increase in proportion from wind farms in the total system generation, the wind turbines exert more influence on the system and the regulation of parallel operation for the wind turbines has been becoming more and more stringent. The wind turbines are likely to be tripped off promptly under faulty conditions because of the system protection functions, and will cause severe imbalance between generation and load. Therefore, many utilities start drawing up regulations which require that the wind turbine should remain connected to the grid when a fault takes place in the system to help the system run through the fault. Such requirement is referred to as Low Voltage Ride Through. The main purpose of this thesis is to study the utilization of reactive power compensation for the enhancement of Low-Voltage-Ride-Through capability of wind turbines to prevent tripping of multiple wind turbines under system faults. Two sample systems are adopted as the study systems of which both the effects of incorporating wind turbines on the system voltage and the advantages of reactive power compensation for improving system dynamic characteristics are investigated. Comparisons are made about the performances of the wind farm equipped by SVC and STATCOM to improve the wind farm voltage during and after a fault. Moreover, the effects of the SVC and STATCOM device parameters on the system dynamic responses subject to system faults are also analyzed.