风电机组与储能装置的协调平滑控制策略

储能和机组的联合运行可以降低风电出力的波动,然而所需的储能容量太大。为了降低储能装置的容量,提出了一种风电机组与储能装置的协调平滑控制策略。在机组的功率控制中引入了一个低于机组固有频率的低通附加控制环节,利用机组的惯性平抑风电功率的高频分量,而风电功率的中频分量采用储能装置进行补偿控制。机组与储能装置的协调控制能够实现对风电功率的较大范围频率分量的平滑,同时可有效降低储能装置的容量。采用2MW风电系统及0.3MW/0.2MWh ESD模型对控制方法进行了仿真对比研究。仿真结果表明,所提出的控制策略对机组输出的有功功率有较好的平滑效果。

Coordinated smoothing control strategy of wind turbine and energy storage device

The energy storage device ( ESD) can be combined with the wind turbine to smooth its power variation, but too much storage capacity is needed for effects. In order to reduce the capacity of ESD, a coordinated smoothing control strategy of wind turbine and ESD was proposed. The low-pass supplementa-ry control with the cut-off frequency which is lower than the natural one of the wind turbine was added in-to the power control loop of the wind turbine, and the low-frequency components of wind power were sup-pressed by the inertia of wind turbine. The intermediate-frequency components are compensated by the ESD. As a result, the coordinated control of wind turbine and ESD smoothes a large range of frequency components of wind power, and the capacity of ESD is decreased effectively. The combined model with 2 MW wind power system and 0. 3 MW/0. 2 MWh ESD was used to validate the strategy by the comparison research. Simulation results show that the proposed control strategy takes better effects than the individual control.