含分布式电源的配电网潮流计算改进方法研究

Modified power flow calculation method of distribution grid with DGs

随着电力系统中接入的分布式电源越来越多,给配电系统的潮流计算带来了一些问题。基于已有的并入分布式电源的潮流算法,对典型的前推回代法中处理PV节点的方法进行了改进,通过电压改变量直接更新得到下次迭代的电流,无需更新无功功率;推导出了适合小负荷情况下的导纳矩阵,使之能够更准确地处理节点小负荷情况下分布式电源并网计算。最后利用IEEE33节点系统进行仿真,通过对比证明该算法能够有效地解决PV恒定型以及小负荷情况下分布式电源并网问题。

The distributed generations （DG） result in some problems in power flow calculation when more and more DGs are connected into power system. The algorithm of solving PV nodes in back/forward sweep calculation is improved based on the existing power flow algorithm. The next iterative current value can be obtained via the directly renewed voltage variables, and it does not need to update the reactive flow. The admittance matrix is derived to adapt small load and accurately handle the power flow in small load with DGs. Plenty of simulations are carried out on the IEEE33 bus test system. The results prove that the algorithm can effectively solve the grid connecting problem in PV nodes and small load situation.