苏州同里新能源小镇的交/直流混合配电网潮流计算方法研究

苏州同里新能源小镇是一个集光伏发电、风力发电、储能、电动汽车、能源路由器等特征元件为一体的小镇。在传统配电网固有元件(变电站、配电线路、无功补偿、负荷等)的基础上,小镇配电网引入了新型的设备元件(分布式可再生电源、储能设备、电动汽车、直流负荷、能源路由器等),构成了交/直流混合配电网。目前交流配电网的潮流计算方法已经相当成熟,而直流配电网一般都采取闭环运行方式,故该方法无法在交/直流混合配电网中使用。本文根据含能源路由器等新型设备的交/直流配电网特点,将传统的牛顿拉夫逊法进行相应改进,分别对交流配电网和直流配电网进行潮流求解,通过作为接口的电压源换流器,进行交替迭代,直至交/直流网络均潮流收敛。该潮流计算方法将在同里新能源小镇的配电网实例中加以应用。

Study on Power Flow Calculation Method for AC/DC Hybrid Distribution Network of Tongli New-energy Town in Suzhou

Tongli new-energy town in Suzhou is a small town integrating with photovoltaic power generations,wind power generations,energy storages,electric vehicles,energy routers and other components.On the basis of such inherent components of the traditional distribution networkas substations,distribution lines,reactive power compensations,loads and etc.,new components for example distributed renewable power supplies,energy storages,electric vehicles,DC loads,energy routers are introduced to construct the AC/DC hybrid distribution network.Currently,power flow calculation method for AC distribution network is quite mature,while the closed-loop operation mode is generally adopted in the DC distribution network,which cannot be used in the AC/DC hybrid distribution network anymore.According to the characteristics of AC/DC hybrid distribution network with energy routers and other new equipments,new method improved from Newton-Raphson method is proposed in this paper.Power flow is solved in AC/DC power distribution network respectively so to perform alternating iteration through the power supply converter as the interface,until flow convergences of AC/DC network.The proposed power flow calculation method will be used in the AC/DC hybrid distribution network of Tongli new-energy town.