From the angles of both mitigating wind power fluctuations and operation costs

we comparatively analyzed the operational strategies of battery energy storage systems（BESS） which are designed to mitigate wind power fluctuations. Three different operational strategies for the BESS are as follows:（a）operating in whole and alternating charging/discharging state stochastically

（b）operating independently and alternating charging/discharging states synchronously

（c）operating independently and alternating charging/discharging states asynchronously. The Sequential Monte Carlo simulation technology（SMCST） was adopted to simulate operations of the BESS in different strategies with considerations of random predicting errors on wind power. Based on simulation results

performances on mitigating wind power fluctuations were evaluated. In addition

costs of the BESS consumed for mitigating wind power fluctuations were estimated according to investment costs and circle lift depletion of the BESS. Comparative analyses indicate that the strategy of operating independently and alternating charging/discharging states asynchronously is the best as it can compromise the mitigating performances of wind power fluctuation and mitigating costs.