Analysis and Identification of Regional Load Inertia Time Constant
The power system with high proportion of renewable energy and high proportion of power electronic equipment reduces inertia and endangers frequency stability.The load composition is complex,and the accurate identification of the inertia time constant is conducive to the inertia evaluation of the system.Therefore,an identification method of regional load inertia time constant was proposed.Firstly,the expression of load inertia time constant was given based on generalized inertia,and the frequency and power swing curve was proposed based on the voltage of load connection point;then,the least square method was used to identify the inertial time constant,and the formula for calculating the integrated inertial time constant of the regional load was given for multi-point load;finally,the progressiveness and effectiveness of the proposed method were verified by ETAP12.0 simulation of IEEE 3-machine 9-node system(excluding new energy units)and the local regions of East China Power Grid(including new energy units).The results show that by the proposed method we can effectively calculate the inertia characteristics of the evaluated load and support the frequency stability analysis of the power grid.
inertiainertia time constantloadidentification of parametersleast squares method
万方数据
维普
