考虑短期互补的水光发电系统中长期优化调度

Medium-and long-term optimal scheduling of hydro-solar power system considering short-term complementation

为解决水光发电系统在送电通道中的电量消纳与功率波动问题,从保障电网稳定的角度出发,提出水光沉浮互补法对光电随机波动性进行逐次补偿,同时整合电量与出力互补信息,进而通过电量信息识别短期损失电量与波动补偿电量,根据出力信息拟定短期互补过程,以此为基础建立中长期消纳电量最大,考虑短期弃电与波动风险的分级调度模型。实例研究表明:相对于仅短期互补,中长期互补能够进一步调配水电的时空特性,提升长期消纳电量并兼顾短期风险,其中消纳电量相对增益与径流保证率呈单峰曲线分布关系,平水年增益最为显著,而送电稳定性相对增益则与径流保证率呈正相关性,枯水年最为明显,综合两者效果偏好,能够完善调度决策面对不同来水场景的适用性。

To overcome the power consumption and fluctuation in the power transmission of a hydrosolar power system to ensure the stability of the power grid,we present a hydro-solar floating compensation method for compensating photoelectric random fluctuations successively,integrating the information of power quantity and output complementation,and identifying short-term power loss and fluctuating compensation power by using capacity information.On this basis,we develop a hierarchical scheduling model for maximizing medium-and long-term power consumption and taking into account the short-term risks of power abandonment and fluctuation.The results show that in comparison with short-term complementation,either medium-or long-term one can better allocate the time-capacity characteristics of hydropower and improve long-term consumption while taking into account short-term risks.A single-peak curve distribution relationship holds between the power consumption gain effect and the runoff guarantee rate,and the gain in the normal hydrological year is the most significant;the stability gain effect is positively correlated with the runoff guarantee rate,and it is the most obvious in the dry year.Thus,our method,by combining the effect preferences of both,can improve the applicability of scheduling decisions to different inflow scenarios.