In wind-storage combined system,in order to reduce the number of charging and discharging cycles in a dual battery unit energy storage system and reduce the charging and discharging current ratio of battery unit under high charging and discharging power command,a hierarchical optimization control strategy for charging and discharging power of energy storage systems is proposed.The operation mode of two-battery unit in the traditional strategy in which one for charging and one for discharging,is improved.When the energy storage system meets high output power instructions,the operation mode of two-battery unit charging and discharging simultaneously is adopted.When a battery unit charges or discharges to the upper or lower limit of power,the charging and discharging state of the units switches.At the same time,optimize the cycle range of battery charge state in two operating modes to balance charging and discharging energy.Simulation results show that under the same wind power smoothing effect,the proposed strategy can reduce the charging and discharging current rate of battery units under high charging and discharging power commands,reduce the number of battery charging and discharging cycles,extend battery life,and reduce the configuration requirements for energy storage battery power and capacity.
关键词
电池储能系统/风电功率/电力系统/优化控制策略/充放电控制/电池寿命
Key words
battery energy storage system/wind power/power system/optimization control strategy/charge and discharge control/battery life
维普
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