Capacity Planning of Microgrid Energy Storage Based on Probabilistic Method

摘要

Rational planning of storage capacity has an important role in secure stabile and economic microgrid working. In order to fully consider the impacts on microgrid of power randomness and the change of storage state of charge, a method of microgrid energy storage capacity planning considering the time-varying constraint of storage power exchange was proposed based on probabilistic method. Firstly, the probability distribution of unconstrained storage port power exchange was calculated and the change rule of state of charge during storage working and its impacts to storage power exchange was analyzed. Then, the running of energy storage was sampled and simulated according to the probability distribution of storage port power exchange, and the storage capacity was calculated by matching the needs of charging and discharging and the time-varying constraint. Finally, the result of microgrid storage capacity planning in a certain confidence interval was obtained by counting the probability distribution of storage capacity.