基于线性近似模型的三相不平衡有源配电网重构

Reconfiguration of Unbalanced Active Distribution Network Based on Linear Approximation Model

针对配电网中分布式电源和负荷具有波动性、时变性,并普遍以三相不平衡方式运行,提出一种有源配电网重构方法。首先,对一天的风力光伏发电和负荷功率进行日前短期预测建模,制定以一天为开关动作周期的日重构决策,降低对配电网运行的冲击。在此基础上,建立以配电网运行日损耗最低和电压偏差最小为总目标的三相不平衡有源配电网多时段重构数学模型,并基于最佳等距分段线性逼近法对原非凸模型进行精度可控的线性近似。最后,通过标准化配电测试系统验证了重构模型的有效性和精确性。

For the fluctuation and time variability of distributed generation and load,and the general unbalanced operation as well,a reconfiguration method for active distribution network is proposed.Firstly,short-term prediction models of wind power,photovoltaic power and load power are built on the day before reconfiguration.In order to minimize the impact on the operation of the distribution network,a daily reconfiguration decision which takes one day as switching action cycle is proposed.On the basis of that,a mathematical model for multi-period dynamic reconfiguration for three phase unbalanced active distribution network is established,which aims at the minimum daily loss of the distribution network and voltage deviation.Moreover,the original non-convex model is linearly relaxed based on the premise-controlled optimal equidistant piecewise linear approximation algorithm.Finally,the effectiveness and accuracy of the reconfiguration model are verified by standardized distribution networks test system.