现有配电模式下配网供电能力研究

Research on supply capability of distribution network under present distribution mode

从一起配网潮流计算不收敛实例出发,分析了在存在大阻抗、大负荷支路情况下配网潮流计算不收敛的原因。发现并非配网潮流计算算法不合理而导致计算不收敛,而是由于在迭代过程中电压方程存在不可行解。在此基础上进一步对现有配电模式下配网的供电能力进行了分析。证明在现有配变供电区域过大、低压线路过长的情况下,配电设备容量不能得到充分利用,满足负荷发展的能力差。较好地解释了在现有配电模式下,配电网络成为供电瓶颈的问题。最后,通过与国外配电模式的比较,对如何提高配电网供电能力提出了建议。

According to a example of non-convergence in distribution power flow calculation,the reason of non-convrgence when big impedance or heavy load exists in calculation is analyzed. The analysis result shows that its non-cortrengency is caused by the infeasible solution of voltage function in iteration process.On the basis of it ,supply capability of distribution network under existing conditions is analyzed. The present distribution mode is the supply district of a single distribution transformer is too broad and the low voltage lines are too long. It shows distribution equipments can＇t be fully used and the capability of distribution network for load increase is low under this condition and it can plain the distribution network is the supply weak link. Finally. the advice of improving the supply capability of distribution network is presented after compared with the foreign distribution mode.