网损微增率计算方法的研究

Study on Power Loss Incremental Computation

比较分析了网损微增率3种算法(转置雅可比矩阵法、阻抗矩阵法和导纳矩阵法)的优缺点,探讨了教材及相关文献算法中对平衡机和PV节点处理上的不合理之处。通过IEEE 5节点算例对各算法进行比较分析,结果表明:实用阻抗矩阵法与导纳矩阵法假设简化较多,其计算结果与真实值(雅可比矩阵法)相比存在不小的误差。改进的阻抗矩阵法虽考虑了偏微分系数项的推导计算,但仍有不少简化,与前两种算法相比并未体现出明显精度上的优势,且数值计算结果不稳定。

Three algorithms of power loss incremental are studied and the fuzzy points on dealing with swing bus and PV bus in algorithms are clarified. According to an IEEE5 bus example,the results of the three algorithms calculating power loss incremental are presented. The result has shown that the practical impedance matrix method and admittance matrix method has errors because of hypothesis or predigesting. Although the second part （containing incremental part） of the formulas is considered in the improved impedance matrix method, the obvious advantages of results precision are not presented and the numerical results are unstable. So whether it could be reliably used in the power system calculating is worth to discussion.