基于储能系统提升直驱风电低电压穿越能力

Improve low-voltage ride-through capacity of directly driven wind turbine with energy storage syetem

风电作为环境友好型电源在电网中的渗透率不断增大,其弱的致稳性与弱抗扰性对电力系统电能质量及其运行稳定性将产生重大影响。风电场具备低电压穿越能力已成为其并网发电的必要条件,将高压大功率三电平变换器应用到直驱风电系统,提出采用超级电容(EDLC)储能系统提升机组低电压穿越能力。在研究基于超级电容储能的直驱风电系统数学模型、控制策略的基础上,对网侧变换器控制策略做了进一步改进。在Matlab/Simulink环境下搭建了完备的系统仿真模型。仿真结果很好地验证了所提方案的正确性和有效性。

As friendly environmentally power, wind power penetration rate in power grid was increased, but the power quality and operational stability of power grid were significantly impacted by it＇s weak anti-disturbance and weak stability performance. Wind farms which had low voltage Ride-Through（LVRT） ability had become the necessary conditions for grid-connected power generation. The ultracapacitor（EDLC） energy storage systems were used to improve LVRT ability of direct-drive wind power system based on three level converter. The mathematical model and control strategy of whole system was studied, and further improved the control strategy of grid-side converter. The complete system was developed based on simulink platform. The simulation results show the correctness and validity of the proposed scheme.