Voltage Stability Improvement Research of Wind Farm Equipped Micro-Grid with Switched-Capacitor and Static Synchronous Compensator
Date Issued
2014
Date
2014
Author(s)
Chou, Ying-Chun
Abstract
Renewable energy generation system and micro-grids received much attention in recent years.In Taiwan,wind farms are usually installed in coastal areas faraway from existing subtations.If micro-grids equipped with wind farms are connected to power systems,substantial variations in generator terminal voltages will be observed when there is a fault in the power system. Severe faults in the system may ever cause voltage collapse and generator instability.
The purpose of this thesis is to investigate terminal voltage stability of wind generators when the power system is subjected to disturbances. MATLAB/Simulink/SimPowerSystems was used to perform digital simulations on the wind generator system subjected to disturbances. The grid-connected micro-grid simulation model included the area loads and the wind farm composed of squirrel-cage induction generators.
Results from theoretical analyses and digital simulations indicate that ,as the transmission line impedence increases,the load limit for the wind farms will decrease.Shunt-capacitors(SCs) can be used to improve the terminal voltage stability of wind farms.In addition,thyristor switched capacitors(TSC) can be used to effectively control the voltage magnitude within the range from 0.9 to 1.1p.u. when the area load change with time.On the other hand,when there is a disturbance such as system fault or motor starting,SCs and static synchronous compensators(STATCOMs) are useful for the enhancement of generator terminal voltages. Therefore, SCs ,which are simple and inexpensive,and STATCOMs ,which are capable of provide rapid and smooth compensation can be employed to provide voltage regulations and reactive power compensations for a remote micro grid with wind farms in Taiwan.
Subjects
電壓穩定度
電壓崩潰
風力發電
鼠籠式感應發電機
切換式電容器
靜態同步補償器
SDGs
Type
thesis
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