汛限水位动态控制对水电-新能源互补能力的提升研究

在水能富集地区,丰水期来水量大,水电发电量大,调节能力不足,水电-新能源消纳矛盾突出,互补调度困难较大。为了缓解汛期水电-新能源消纳矛盾,创新地将汛限水位与新能源消纳相结合,探讨汛限水位动态控制对水风互补能力的提升效果。建立了一定弃电率条件下源荷匹配度最大的水风互补模型,以旬为计算周期、小时为计算时段,采用遗传算法对雅砻江下游“两库五级”梯级电站及周边风电场组成的互补系统开展模拟计算,通过对比分析发现汛限水位动态控制方案相比静态控制方案可多消纳2.55%的风电。结果表明,通过汛限水位的动态控制可以动态增加水电可利用的调节库容,从而提升水电调节新能源的能力。

Coordinated control strategy for wind power accommodation based on electric heat storage and pumped storage

To solve the severe problem of wind power curtailment in the winter heating period caused by ＂power determined by heat＂ operation constraint of cogeneration units, this paper analyzes thermoelectric load, wind power output distribution and fluctuation characteristics at different time scales, and finally proposes a two level coordinated control strategy based on electric heat storage and pumped storage. The optimization target of the first level coordinated control is the lowest operation cost and the largest wind power utilization rate. Based on prediction of thermoelectric load and wind power, the operation economy of the system and wind power accommodation level are improved with the cooperation of electric heat storage and pumped storage in regulation capacity. The second level coordinated control stabilizes wind power real time fluctuations by cooperating electric heat storage and pumped storage in control speed. The example results of actual wind farms in Jiuquan, Gansu verifies the feasibility and effectiveness of the proposed coordinated control strategy.