含高渗透率分布式光伏的实用型配电网无功电压控制技术研究

Practical reactive power and voltage optimization method for active distribution network with high penetration distributed PVs

高渗透率分布式光伏接入配电网易造成电压越限,目前提出的电压控制方法普遍过于理论化,难以实用。为此,文中提出了一种实用型中压配电网无功电压控制技术:将每条馈线作为独立控制区域且只选择几个关键点,控制关键点的电压实现整条馈线的电压控制,从而减小电压控制的复杂度。提出"自然电压"的概念,将网损最小化转化为基于"自然电压"的目标函数,建立起节点电压和分布式光伏无功调节量之间的定量关系,使目标函数易于计算,并将约束条件转化为线性的且不再包含潮流方程,从而极大地减小了优化运算所需的信息量。文中所提方法能在较少信息基础上得到次优解,实用性强,最后的算例仿真证明了此方法的有效性。

High penetration PVs tend to bring overvoltage to distribution network,and many proposed methods are too theoretical,which make it difficult to be applied.Therefore,this paper proposes a practical voltage regulation technique for medium voltage distribution network,in which every feeder is treated as an independent control section and selects several critical nodes and achieve regulation of voltage along the feeder through regulation of critical nodes voltage,thereby simplifying voltage regulation.The natural voltage concept is proposed,and the power loss minimization is then converted into an objective based on natural voltage,and the relationship between node voltage and the reactive power of distributed PVs is established,which makes calculation of objective function very easy and converts constraints into linear ones with power flow equations excluded,thereby reducing greatly the information needed in optimization.The method proposed in this paper can get sub-optimal solution and is very practical,and the simulation result confirms the effectiveness of the proposed method.