非对称非均布负荷下配电网线损改进算法

配电网络是指二次降压变压器低压侧直接或降压后向用户供电的网络,具有网络复杂,电压低,网损大的特点。三相不对称运行是低压配电网的主要特点,目前低压线损的理论计算问题大多是采用近似等效的简化算法。为方便和较精确地计算线损,针对低压配电网络的结构特点和实际运行情况在综合比较分析了各种算法的适用范围和优缺点的基础上提出了一种能计及三相不对称和负荷分布不均匀性的低压配网理论线损改进算法,用C++ Builder编程和算法分析的结果表明:改进新算法结合了各种算法的优点,算法不设置过多的简化假设条件,因而更符合低压配电网实际。

Improvement in Theoretic Line-loss Calculation of Distribution Networks Under Asymmetric Loads

In the course of transmission and distribution of electrical energy, the electricity network components (transformers, transmission lines, compensation and adjustment equipment and measurement and protection devices, etc.) should spend some energy. In the given period (Day, month, quarter, year), electricity depletion produced in all components of electricity grid is known as the line depletion of electricity grid, as line depletion for short. As the terminal of an electric network, the distribution network is directly connected with the users. It is characterized with wide spread line, low voltage level, many devices on the line. Line loss of distribution accounts for a considerable ratio in general networks. Asymmetric loads are quite common in distribution networks,and the approximating algorithms are often used for calculating theoretic line-loss of networks. By comparing and analyzing the merits and deficiencies in the methods, a novel algorithm for calculating line-loss of LV network is presented. Both the unbalance in three phrases and the loads asymmetric along line are proposed. A visual software on Windows is developed by C builder. And the method is experimentally proved. The new method does not heavily rely on some assumptions so it is a real new and accurate method and is suitable for calculating line-loss of low-voltage network.