Research On Improvement Of Wind Farm LVRT Capability And Voltage Stability By Reactive Power Compensation Device

As a clean and efficient new energy resource, wind power has developed rapidly in recent years, the proportion of which in grid is rising year by year, with that it may cause a worse influence on the power system. The influence caused by wind power integrating is analyzed in this paper, which should be showed in three aspects. Fist, the wind farm needs to absorb reactive power, which may lead to a serious decline of voltage level. Second, FSIG needs to absorb a vast sum of reactive power under malfunction or disturbance, which is bad for voltage stability and LVRT capability of the wind farm. Third, the wind speed is changeful, which may lead to a fluctuation of active power and voltage, it goes against the stability of the power system.Some methods to reduce the impacts mentioned above are proposed and researched in this paper. In order to reduce the wind farm's impact on voltage level and voltage stability of the system, SVC or STATCOM should be fixed near the wind farm to work together with a shunt-wound capacitor. Beside that, this paper designs a new BESS-STATCOM model, which is validated to be useful to restrain the fluctuation of active power by installing it around the wind farm.BESS-STATCOM and system models with FSIG/DFIG are set up in this paper, and FSIG system models in different cases are set up for research by adding SVC, STATCOM or BESS-STATCOM to the FSIG system model. And then research conclusions are obtained from MATLAB simulation results. First, it's useful to reduce the impact on voltage level by fixing SVC or STATCOM around the wind farm to work together with a shunt-wound capacitor. Second, it's available to improve LVRT capability of the wind farm and voltage stability of the system by fixing SVC, STATCOM or BESS-STATCOM around the wind farm. Third, the new BESS-STATCOM model set up in this papper is practicable and correct, which can adjust the capability including active power and reactive power, having a good performance on restraining the fluctuation of active power.