风电场相变储能膨胀发电系统容量配置方法

为提高风储发电系统可持续运行能力,提出改进的风电场相变储能膨胀发电系统,对该系统的最优容量选取办法进行了研究。首先采用中值滤波法对特定风电场历史年风电功率数据进行分解,根据风电场实际出力平稳分量与调度水平之间的功率差值制定相变储能膨胀发电系统分频控制策略;然后利用非参数估计计算满足给定风电可调度性置信度水平的系统最优功率交换水平。定义储能系统可持续运行能力评价指标,并与考虑功率投资成本、能量投资成本和保障系统可持续运行投资成本的综合经济学评价函数进行折中,计算系统最优能量交换水平。最后,以配备蒸汽直冲式双螺杆膨胀发电系统的风电场为例进行说明。

Capacity Configuration Method of Phase-change Energy Storage and Expander Generating System in Wind Farm

To improve the sustainable running ability of the wind power generation and energy storage system, a modified phase-change energy storage and expander generating system(PESES)is proposed. The optimization method of the system capacity configuration is analyzed. Firstly, the historical annual mean wind power data are resolved based on the median-filtering algorithm. The difference between the stable component of the actual output in the wind farm and the dispatch order is calculated to formulate the fractional frequency control strategy. Secondly, the non-parametric estimation is used to calculate the optimal power level of the PESES under which the given wind power schedule ability confidence level is satisfied. The evaluation index of the sustainable operation capability for the energy storage system is defined. Meanwhile, the comprehensive economic evaluation function consists of the investment costs of the power exchanging, the energy supporting and the sustainable operation safeguard of the system. On the basis of the evaluation index and the evaluation function, the optimal energy capacity of the PESES is planned. Finally, an example of the operation and planning of a wind farm equipped with a steam-jet double-screw expander generating system is described.