计及电压波动的配电网无功优化运行

针对由于分布式电源(Distributed Generation,DG)出力和负荷的不确定性而引起的电压波动的问题,采用电容器组、分布式电源和静止无功补偿装置(Static Var Compensator,SVC)协调控制的方法,平抑电压波动。首先,在电容器组静态优化时,运用网络参数变动定理修正系统潮流,提高潮流计算的速度,快速得到补偿后新的各节点电压。其次,对于电容器组的静态优化结果,采用谱系聚类法合并分段,满足投切开关动作次数的约束,确定各电容器组的动作时刻和补偿容量,为实时电压控制建立良好的控制环境。最后,在电容器组补偿的基础上,分析DGs、SVC无功出力极限并作为约束条件,当实时节点电压越限时,通过电压灵敏度分析计算DGs、SVC实时无功调节量,并通过算例分析验证该方法的有效性。

Reactive power optimization of distribution networks considering DGs voltage fluctuation

According to the voltage fluctuation caused by the distributed generation (DG) and load uncertainty problem of reactive power compensation device with capacitor, distributed generation and static var compensator (SVC) method of coordinated control, stabilize the voltage fluctuation. Firstly, when the static optimization of the capacitor bank is carried out, the power flow is corrected by using the parameter change theorem of the electric network, and the speed of the power flow calculation is improved, and the new node voltage is compensated quickly. Secondly, to optimize the static results of capacitor group, using hierarchical clustering method with piecewise, meet the switching action number constraints, determine the action time and the compensation capacity of each capacitor group, real-time voltage control to establish a good control environment. Finally, on the basis of capacitor bank compensation, the reactive power limit of DGs and SVC is analyzed as a constraint condition. When the real-time node voltage is limited, the real-time reactive power regulation of DGs and SVC is calculated by voltage sensitivity analysis, and through the examples to verify the validity of the method.