考虑风速差异的风电场减载方案与一次调频策略

风电的大规模并网给电力系统带来了惯量降低和一次调频能力不足等问题,可减载运行且具备调频功能的风电场可有效应对该问题。为此,提出了一种风电场减载方案以及相应的一次调频策略。首先,介绍了综合惯性控制和桨距角控制的原理,并分析了风电场减载运行的必要性。然后,研究了不同风速下风机减载能力的差异性并制定了风电场内减载功率分配方案,根据制定的减载方案,提出了相应的一次调频策略,以充分利用风电场的调频能力并避免频率的二次跌落。最后,基于Matlab/Simulink搭建了仿真系统模型,仿真结果表明所述减载方案和调频策略可以合理分配减载功率并提升风电场的调频效果。

Research on Deloading Scheme and Primary Frequency Regulation Strategy of Wind Farm Considering Wind Speed Difference

The large-scale wind power integration brings some problems such as the reduction of inertia and the shortage of primary frequency-regulation capability to the power system. Wind farms with deloading operation and frequency-regulation function could effectively deal with these problems. Therefore, a deloading scheme and the corresponding primary frequency regulation strategy of wind farm are proposed. Firstly, the principle of integrated inertia control and pitch-angle control is introduced, and the necessity of deloading operation of wind farm is analyzed. Then the difference of deloading capability of wind turbines with different wind speeds is studied and the deloading power distribution scheme of wind farm is formulated. Furthermore, according to the deloading power distribution scheme, the corresponding primary frequency regulation strategy is proposed to make full use of the frequency regulation capability of wind farm and avoid the secondary frequency drop. The simulation system model is built based on Matlab/Simulink, and the simulation results show that the deloading scheme and frequency regulation strategy could reasonably distribute the deloading power and improve the frequency regulation effect of wind farm.