基于正负零三序形式牛顿法的三相不平衡系统潮流计算方法

随着电力系统规模的不断扩大,超负荷的运行,多种形式的分布式电源加入,都会使得系统的三相不平衡度不断增大,而传统的潮流计算不再适用在三相不平衡系统内。本文主要采取正负零三序形式的牛顿法潮流计算来解决此不平衡问题。并针对序分量形式的改进牛顿算法的初值敏感性问题,由于初值选取不当导致的系统不收敛,提出负序和零序的初值收敛,可以保证牛顿法的收敛性,并同时解决了当系统含有以AC-DC-AC为接口的分布式电源的复杂处理问题,避免对分布式电源复杂的建模,而采取把它看成系统线路的一部分,以导纳矩阵的形式加入到潮流计算中。并通过IEEE节点系统给出仿真证明。

Three-Phase Unbalanced Power Flow Calculation Method based on Positive-Negative Three-Sequence Newton Method

With the expanding scale of the power system, overload operation and the increasing integration of distributed generations, it unbalances the three-phase power system. Meanwhile, the traditional power flow method is not fit. This paper proposes the Positive-Negative-Zero sequence of Newton method to solve the unbalanced problem in the power system. And then, the convergence theorem in negative and zero sequence of Newton method is proposed, which contributes to decrease the sensitive of initial value and guarantee the convergence of three-phase unbalanced power system. This thesis can solve complex modeling of the distributed generations with the AC-DC-AC interface, avoid complicated calculating.The distributed generations with the AC-DC-AC interface are considered as a fraction of the power system circuit. Creating the admittance matrix of it and in the form of admittance matrix is added to the current power flow. Simulation results are given by IEEE node system.