风电-抽水蓄能联合跨区域送电研究

Research on Combined Cross-regional Power Transmission of Wind Power and Pumped Storage

由于风电固有的不确定性和间歇性,以及中国特有的风电装机与负荷需求逆向分布的特点,使得中国大规模风电消纳成为一大难题,为此借助抽水蓄能电站良好的调节性能,对风电场-抽水蓄能电站联合跨区域送电展开研究。文章采用核密度估计方法拟合了风电功率的预测误差分布,建立了考虑多个受端电网调峰需求的优化模型,为提高调度结果的精确性,增加抽水蓄能电站的水力约束和单个机组的操作约束,并利用确定性转换和线性化技术将原随机模型转化为确定性混合整数线性规划问题进行求解。实际案例研究表明,风电--抽蓄联合输电可在大规模消纳风电的同时,减小多个受端电网的峰谷差。

Due to the inherent uncertainty and intermittence of wind power, and the geographical mismatch between the wind power bases and the load demand in China, large-scale wind power consumption in China has become a major problem. Therefore, with the help of the good regulation performance of pumped storage power station, the combined cross-regional power transmission of wind farm and pumped storage power station is studied. In this study, the forecasted error distribution of wind power is fitted using kernel density estimation. On this basis, an optimization model that considers the peak shaving demands of receiving-end power grids is then established to determine the daily operation of the wind farm-pumped storage hydropower plant hybrid system. The hydraulic constraints of the pumped storage hydropower plant and individual unit operation constraints are also taken into account to make the model more accurate. The actual case study demonstrate that the integrated transmission of the wind power and pumped storage hydropower plant hybrid system can reduce the peak-valley difference of the receiving-end power grids while absorbing wind power on a large scale.