配电网谐波量测装置最优配置方法

The Optimal Allocation Method of Harmonic Measuring Device in Distribution Network

为满足油田节能减排与工艺调整要求,变频器等非线性电力电子设备的应用日益广泛,油田配电网谐波污染日趋严重。谐波在线监测系统为测量和分析油田配电网谐波分布特征奠定了基础;但受应用经济性约束,谐波量测终端安装数量有限,有必要对其安装位置进行优化。本文综合考虑谐波状态估计可观测度与冗余度,提出了一种量测终端优化定址方法。采用谐波状态估计可观性逻辑判断法,利用节点关联矩阵计算不同谐波量测终端配置方案下系统可观测度与冗余度;在保证系统可观测度最大的前提下,以冗余度最大为目标优化量测终端安装位置。实现在终端数量有限的情况下提高油田配电网谐波状态估计的可观测度与精度,建模仿真结果证明了该方法的有效性。

In order to satisfy the requirements of energy saving and proeess adjustment in oil field, the frequeney eonverters and other non-linear power electronic equipments are widely used, and the harmonic pollution of oil field distribution network is raising serious. The harmonic on-line monitoring system lays a foundation for measuring and analyzing the harmonic distribution characteristics of oil field power distribution network. However, due to the eeononfie constraints of application, the installation quantity of harmonic measuring terminal is linfited, so it is necessary to optinfize its installation position. Considering both the observability and the redundancy of harmonic state estimation, a method for the optinfization of measuring terminal addressing is proposed. The observability and redundancy of the system under different harmonic measurement terminal configurations are calculated by using node correlation matrix and observability logic judgment method of harmonic state estimation. On the premise of ensuring the maximum observability of the system, the installation position of the measuring terminal is optimized with the maximum redundancy. In the ease of limited number of terminals, the considerable measure and precision of harmonic state estimation of oilfield power distribution network can be improved. Simulation results show that the method is effective.