In a solar-battery-charge DC micro-grid,active power fluctuations,oscillations or abrupt changes,and interactions between multiple converters connected in parallel on the bus can cause power imbalance and bus voltage fluctuations. In order to solve the balance between supply and demand of DC micro-grid power, and utilizing the complementary characteristics of super capacitor and battery, this paper proposed a hybrid energy storage frequency division control strategy. Under the premise of ensuring super capacitor and battery charge and discharge be within certain limits, the bus voltage control loop is adopted. Different from the frequency band of the hybrid energy storage unit control loop responding to the bus power fluctuation,different stealth filters are set in the controller to stabilize the power fluctuation in the DC micro-grid. Finally, the effectiveness of the frequency division control strategy of the hybrid energy storage system was verified by the simulation experiments.%在光-储-充直流微电网中,有功功率的波动、振荡或突变以及并联在母线上多个变换器间的相互作用都会引起功率不平衡和母线电压波动.为了解决直流微电网功率的供需平衡,利用超级电容和蓄电池互补的特性,提出了混合储能分频控制策略.在保证超级电容和蓄电池充放电不越限的前提下,根据母线电压控制环和混合储能单元控制环对母线功率波动响应的频段不同,在控制器中设置不同的隐形滤波器来平抑直流微电网中的功率波动.最后通过仿真试验验证了混合储能系统分频控制策略的有效性.
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