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混合储能系统（HESS）将能量型储能和功率型储能结合，充分利用不同储能设备的特性取长补短，可以适应微电网各种场合的需求。首先，建立了混合储能系统的数学模型，提出了一种基于能量转换（PCS）模型的超级电容器蓄电池混合储能系统，文中采用蓄电池与超级电容分别经过双向 DC/DC 变换器接入直流母线并联，再经同一采用PQ控制算法的 DC/AC功率变换器接入交流电网的接入方式，该结构可减少 DC/AC 变换器数目，最后进行仿真研究，仿真结果表明，该储能系统一方面满足超级电容在短时间大功率吞吐过程中的组串电压范围要求，另一方面可维持直流母线电压恒定，减小锂电池在充放电过程中的电流纹波，控制灵活性高，具有所需超级电容和电池电压等级较低，利用率高的优点。“,”Combining the energy storage and power energy storage,hybrid energy storage system (HESS)makes full use of the characteristics of different energy storage equipment and meets the requirement of micro-grid in various occasions. Here, we have established a mathematical model of the hybrid energy storage system and proposed the hybrid energy storage systems with super capacitor and battery based on energy conversion (PCS) .Firstly,the storage battery and super capacitor were connected parallel to the DC bus through two-way DC/DC converter,then connected to the AC grid through DC/AC power converter by the same PQ control algorithm ,reducing the number of DC/AC converter.Finally, simulation research was carried on.Our studies have shown that the energy storage system achevies voltage range in a short time during high power throughput. On the other hand,it maintains a constant DC bus voltage and reduces the current ripple of lithium battery in the process of charging and discharging with higher control flexibility,lower voltage level of the super capacitor and battery and higher efficiency.