Control Oriental Charging Load Modeling and Dispatchable Capability Evaluation of Electric Vehicle Cluster Based on Markov Chain Theory

Aiming at the problems of small unit power, heterogeneity of battery capacity and different travel behavior of electric vehicle (Electric Vehicle, EV) users, a control-oriented charging load modeling method of EV cluster considering users' travel chain is proposed, which can make EV cluster better participate in power grid dispatching and operation. Firstly, the Markov property of EV users' behavior is analyzed, and on the basis of dividing the multi-state charge state interval of EV, the one-step transition probability in the interval of charging and travel state is derived, and the charging load model of EV cluster considering travel characteristics is established based on Markov chain theory. Then, the evaluation process of dispatchable capability for EV cluster is designed, and the evaluation method of dispatchable capability is constructed. Finally, the aggregation model and dispatchable capability evaluation method for EV cluster are simulated and verified, and the results show that the aggregation model and evaluation method are more accurate and effective compared with various algorithm.