考虑电网动态特性的无功补偿配置方案

Reactive Power Compensation Scheme Considering Dynamic Characteristics of Power System

电力系统中源-网-荷的动态耦合关系及其相互影响特性难以分析,尤其随着新能源、新技术和新设备的投入使得耦合特性日趋复杂。为了得到贴合系统动态特性的无功补偿配置方案,本文在综合动态等值的基础上给出了动态阻抗矩阵的相关定义。结合动态阻抗矩阵和功率权重值,推导并给出了考虑功率权重的节点被动/主动阻抗指标;选取符合稳定特性要求的节点作无功补偿,最终得到了考虑电网动态特性的无功补偿配置方案。仿真证明了所定义的被动/主动阻抗指标可用于分析节点自稳性/致稳性,据此提出的无功补偿配置方案可以有效地减小节点电压波动并提高电压稳定水平。

The dynamic coupling relations among the source,network and load in a power system together with their interactive influences are difficult to analyze.Especially,the coupling characteristics will become increasingly complex along with the introduction of new energy sources,new technologies,and new equipment.To obtain the reactive power compensation scheme which is in accordance with the system’s dynamic characteristics,the related definitions of dynamic impedance matrix are given in this paper based on the comprehensive dynamic equivalence.Combined with the dynamic impedance matrix and power weights,the passive/active impedance indicators of nodes are derived with the consideration of power weights.Afterwards,the node that satisfies the stability requirement is selected as reactive power compensation.Finally,the reactive power compensation scheme is obtained with the consideration of dynamic characteristics of power grid.Simulation results show that the proposed passive/active impedance indicators can be applied to analyze the self-stability/resulting stability of nodes,and the novel reactive power compensation scheme can effectively reduce the voltage fluctuations of nodes while improving the voltage stability level.