新型电力系统点对网惯性支撑能力在线监测方法

Online Monitoring Method for Inertial Support Capacity of Point-to-Grid in New Power Systems

准确及时地监测低惯量新型电力系统中聚合电源汇集点对电网的惯性支撑能力,对于提升系统安全、稳定、经济化运行具有重要意义.为阐明点对网的惯性支撑能力在线监测方法的基本原理,首先对以摇摆方程为基础的电力系统等效惯性常数定义及现有在线监测方法进行回顾;然后,为弥补现有在线监测方法在准确性上的欠缺,创新性地提出基于回归法的等效惯性常数辨识方法,并与在线惯量监测方法结合,构建基于同步相量测量单元的新型电力系统点对网惯性支撑能力在线监测的系统性方法;最后,利用改进的新英格兰10机39节点系统仿真分析,论证了该惯性支撑能力在线监测方法的实时性、准确性及其对新型电力系统的适用性.

An accurate and timely monitoring for the inertia support capability of the point of interconnection of aggregated sources to the grid in a low-inertia new power system is crucial for the safety,stability,and economic operation of the system.In order to explain the basic idea of the online point-to-grid inertia monitoring method,the definition of inertia of power system based on the swing equation and existing online monitoring methods are analyzed.Then,in order to improve the accuracy of the existing online inertia monitoring method,an equivalent inertia constant identification method based on the regression method is developed.Combining the proposed inertia constant identification method with the online inertia monitoring method,a systematic method for online monitoring of the inertia support capacity of point-to-grid in new power system is developed based on synchronous phasor measurement units.Finally,the simulation analysis of a modified New England 10-machine 39-bus system proves the accuracy and the feasibility of the developed real-time inertia monitoring method for the new power system.