改进牛顿法大规模电力系统潮流计算

电网互联导致电力系统规模不断扩大，对牛顿法进行潮流计算提出了更高的要求。探讨5种改进牛顿法应用到大规模电力系统潮流计算中。经IEEE 300、Poland多个互联的大规模电力系统共6个算例分析表明，算法1和算法2改善了初值范围，同样的迭代次数下，收敛精度较经典牛顿法高，但计算时间较经典的牛顿法并未明显提高；算法3和算法4提高潮流计算的速度和收敛精度。经UCTE 1254病态系统测试，算法3较算法5能高效地处理病态潮流问题，因而更适合于大规模电力系统潮流计算。

Improved Newton's Methods Based on Power Flow Calculations of Large-scale Power Systems

Scale of the power systems is expanding due to the interconnections, which sets more requests to the power flow calculations with Newton''s method. In this paper, 5 improved Newton''s methods applied to the power flow calculations of large-scale interconnected power systems are discussed. Numerical simulations on the 6 test systems which include IEEE 300 buses and Polish interconnected large-scale power systems indicate that method No.1 and method No.2 have improved initial value, and in the same iterative numbers, they obtain higher convergence tolerance but computing times are not obviously decreased. Method No.3 and method No.4 make the speeds and convergence tolerance improved much. The numerical simulation on an ill-conditioned system of UCTE 1254 buses shows that method No.3 can deal with the ill-conditioned problems more effectively than method No.5. Thus method No.3 is more suitable to power flow calculations of large-scale power systems.