基于数据物理融合驱动配电网三相线性化潮流及线损分析应用

Application of Three-Phase Linearized Power Flow and Line Loss Analysis of Distribution Network Driven by Data and Physics Fusion

分布式电源规模化并网引入了下垂控制等非光滑本地控制约束,易导致传统基于前推回代法的潮流计算方法收敛失败,且由于分布式电源并网改变系统潮流方向,导致传统等值电阻法、压降法等理论线损计算方法不再适用。为解决上述问题,提出计及有载调压变压器调压、分布式光伏下垂控制的光滑化模型,构建了基于数据物理融合驱动的三相配电网线性化理论线损快速计算模型。在传统基于稳态运行特性线性化、一阶泰勒展开线性化的基础上,利用偏最小二乘法补偿线性化误差。相比纯物理驱动线性化,在负荷重载条件下仍具有较高精度;相比于纯数据驱动线性化,能够保留支路拓扑信息,适用于开关状态变化场景。所提模型仅对线性化误差进行拟合补偿,在保证线性化精度的前提下,极大地提高了潮流模型的收敛性与计算效率,且能够适应不同负荷水平实现精确误差补偿。基于实际42节点三相配电网系统仿真,验证了所提模型具有较高精度,且能够实现配电网理论线损鲁棒、快速计算。

The large-scale grid connection of distributed generation introduces non-smooth local control constraints such as droop control,which easily leads to the convergence failure of the traditional power flow calculation method based on the forward and backward substitution method.Moreover,because the grid-connected distributed generation changes the power flow direction of the system,the traditional theoretical line loss calculation methods such as the equivalent resistance method and the pressure drop method are no longer applicable.In order to solve the above problems,this paper proposed a smoothing model considering on-load tap changer regulation and distributed generation droop control and constructed a fast calculation model of linearized theoretical line loss of a three-phase distribution network driven by data and physics fusion.On the basis of traditional linearization based on steady-state operation and first-order Taylor expansion linearization,the partial least squares method was used to compensate for the linearized error.Compared to pure physics-driven linearization,it still maintained high accuracy under overload conditions;compared to pure data-driven linearization,it retained branch topology information,making it suitable for scenarios with switch status changes.The proposed model compensated for linearized errors,greatly improving the convergence and calculation efficiency of the power flow model while ensuring linearized accuracy,and it could adapt to different load levels to achieve precise error compensation.Based on the actual 42-node three-phase distribution network system simulation,it was verified that the proposed model had high accuracy and could realize the robust and fast calculation of the theoretical line loss of the distribution network.