Parameter aggregation of microgrid equivalent characteristic model

Microgrid consisted of different devices, such as distributed generations, various loads, energy storage system and various controller. With the increasing of number and capacity of microgrid, it will affect the planning and operation of distribution grid. Based on the equivalent characteristic model of microgrid, an equivalent aggregation method for the characteristic model is proposed in this paper. Firstly, the equivalent characteristic model of microgrid is transform to Z domain which is easy to be aggregation. Then, the Z domain pulse transform function is aggregated into high order model. Finally, the aggregated model is simplified to a low order difference equation and the parameters of equivalent model is identified by recursive damped least square algorithm. The proposed method will be proved through the experiments of distribution grid contains multi microgrid system.