计及可靠性的含源配电网储能系统的优化配置

本工作研究了计及可靠性的含源配电网储能系统的优化配置问题。首先,提出了适用于含源配电网供电可靠率指标的计算方法,具体考虑了负荷时序、分布式光伏出力及储能系统运行特性。然后,基于上述计算方法,提出了计及可靠性的含源配电网储能系统的优化配置模型,综合考虑了配电网的可靠性和经济性指标,约束条件包括配电网潮流、系统功率平衡、光伏出力以及储能系统运行。最后,以17节点配电网为例,利用遗传算法对本研究模型进行求解,得到了含光伏配电系统中储能系统的最优安装位置和容量。并且,分析讨论了储能和分布式光伏同步配置、储能在系统侧集中配置等不同的安装方案以及子目标权重系数的设置对目标函数的影响。

Probabilistic Load Flow Algorithm with the Power Performance of Double-Fed Induction Generators

Probabilistic load flow(PLF)algorithm has been regained attention,because the large-scale wind power integration into the grid has increased the uncertainty of the stable and safe operation of the power system.The PLF algorithm is improved with introducing the power performance of double-fed induction generators(DFIGs)for wind turbines(WTs)under the constant power factor control and the constant voltage control in this paper.Firstly,the conventional Jacobian matrix of the alternating current(AC)load flow model is modified,and the probability distributions of the active and reactive powers of the DFIGs are derived by combining the power performance of the DFIGs and the Weibull distribution of wind speed.Then,the cumulants of the state variables in power grid are obtained by improved PLF model and more accurate power probability distributions.In order to generate the probability density function(PDF)of the nodal voltage,Gram-Charlier,Edgeworth and Cornish-Fisher expansions based on the cumulants are applied.Finally,the effectiveness and accuracy of the improved PLF algorithm is demonstrated in the IEEE 14-RTS system with wind power integration,compared with the results of Monte Carlo(MC)simulation using deterministic load flow calculation.

可回收石油烃总量测定方法研究

通过对样品中可被四氯化碳提取的油类物质在不同前处理条件下含量的测定,考察萃取方法、萃取次数、萃取时间、吸附剂等条件对实验的影响,选择适合的实验条件,满足测量的精密度、检出限、准确度等要求。