中文摘要：

随着分布式电源接入,配电网变为具有一定可控性的主动配电网,其优化运行本质上为包含多种离散可调设备的最优潮流问题。因模型的非凸、非线性,该类问题的高效求解方法仍是研究的热点和难点。有载调压变压器(OLTC)是主动配电网的重要可调设备,其策略对系统运行特性,尤其是电压水平会产生显著影响,故研究含OLTC的主动配电网最优潮流及其高效求解方法是十分必要的。基于支路潮流模型,文中构建了含OLTC的主动配电网最优潮流模型,提出了一种基于分段线性化技术的OLTC精确线性化建模方法,并论证了二阶锥松弛法在求解所构建最优潮流模型上的适用性。基于修订的IEEE系统的算例分析验证了所提出OLTC建模方法的有效性及二阶锥松弛法在求解含OLTC的主动配电网最优潮流问题上的高效性。

英文摘要：

With increasing distribution generation resources integrated,the power distribution network has become an active distribution network(ADN) with definite controllability and its optimal operation is essentially an optimal power flow (OPF) problem with various discrete controllable devices.However,owing to the nonconvexity and nonlinearity of the model,a highly efficient method of solving this kind of problem is the focus of this area.Since the on-load tap changer (OLTC) is an important controllable device in ADN,its strategy has a significant influence on power system operation,especially at the voltage level.Therefore,developing highly efficient methods to solve OPF problems in ADN with OLTC is exceedingly necessary.Based on the branch flow model,an OPF model with OLTC in ADN is developed.An exact linearization modeling method for OLTC using piecewise linear technique is proposed,and the applicability of a second-order cone relaxation method for solving the corresponding OPF problem is demonstrated.A case study based on the modified IEEE system shows the effectiveness of the proposed modeling method of OLTC and the high efficiency of the second-order cone relaxation method in solving the OPF problem in ADN with OLTC.