基于状态估计法的配网谐波源定位技术

Harmonic Sources Localization of Distribution Network Based on State Estimation

准确进行谐波源定位及合理划分谐波源的污染责任是谐波治理的前提。首先,采用谐波状态估计法对配电网进行谐波源定位;然后,针对配电网的网络结构和用户特点,讨论系统的可观测性和量测点的配置等问题;最后,以IEEE-33节点系统为仿真算例,在配电网中接入多个谐波源,对这些谐波源进行定位和污染责任划分。研究结果表明:谐波状态估计可定量地计算出各个节点的谐波电压和注入谐波电流;同时只要配置的监测满足系统的可观测性要求即可完成比较准确地定位,其结果对于判别谐波污染是否超标、谐波源责任划分和谐波的预警具有指导意义。

Accurate harmonic sources localization and rational responsibility partition of harmonic pollution is the premise to harness harmonics. In this paper, harmonic sources localization of distribution network is realized by the method of harmonic state estimation. The observability of the system and the configuration of measurement point are discussed considering the network structure of distribution network and features of consumers. Finally, taking the IEEE-33 bus system as the simulation example, multiple harmonic sources are connected to the distribution network, and harmonic sources localization and responsibility partition of harmonic pollution are made. Research results show that the harmonic voltages and injection harmonic currents of each node can be calculated by the method of harmonic state estimation, and accurate harmonic sources localization can thereby be realized on condition that the observability of the system is satisfied by the measurement configuration. The results have guiding significance for judging whether or not harmonic pollution exceeds limits and for harmonic contribution partition and harmonic warning.