架空和电缆混合馈线的线损估算

Estimation of losses in power distribution systems consisting of overhead line and cable

提出了架空和电缆混合馈线的线损估算方法。在分析架空线和电缆线功率损耗的基础上,先构造混合馈线线损估算的非线性回归模型。模型以混合馈线所含架空线长度、电缆线长度、馈线首端的有功和无功功率为独立变量,通过高阶多项式反映混合馈线的损耗随独立变量变化的复杂关系。针对非线性线损估算模型中的待求回归系数,基于Gauss-Raphson法推导了迭代求解公式;设计了相应的计算程序,并采用实测数据对所提模型和算法进行了仿真计算和分析,得到的检验回归模型合理性指标表明,给出的线损估算模型有效、可行,为架空和电缆混合馈线的线损估算可提供高效率的途径。

A method for fast estimation of loss in power distribution systems consisting of overhead line and power cable was presented. First, a nonlinear model for loss estimation was built based on the analysis of losses on both over-head line and power cable. In terms of the length of over-head lines, the length of power cable, the active and reactive powers injecting to the sending end of the feeder, the power loss on the overall feeder is reflected by a high-order polynomial expression. Then the Gauss-Raphson method is employed to derive and solve for the unknown constants in the nonlinear loss estimation model. A computer program for implementing the proposed method was developed, and the proposed method was numerically tested by a number of actual distribution systems. Numerical test results show that the given method is effective and feasible. The power loss estimation method given in this paper suggests a high efficient method for theoretical loss calculation on modem distribution systems.