中文摘要：

针对微网中蓄电池储能系统充放电时谐波含量较高情况，在DC／DC与DC／AC变流器之间加入LC滤波器滤除低次谐波．在DC／AC变流器与电网之间加入LCL滤波器抑制高次谐波；并在传统PO控制基础上以逆变器侧电感电流和网侧电感电流加权值作为内环电流控制信号．降低了解耦分量的纹波含量，减小了储能系统的电压源特性和LCL滤波器阻抗特性对滤波效果和电压波形的影响，提高了控制精度和响应速度：通过隔离变压器调节逆变器输出电压．保证并网电压的稳定。构建仿真模型仿真验证了双层滤波结构和改进控制策略可有效提高蓄电池储能系统的电能质量。

英文摘要：

Aiming at the high harmonic contents due to the charging and discharging of BESS（Battery Energy Storage System） in microgrid,a dual-filter structure is proposed,which applies an LC filter between DC/DC converter and DC/AC converter to filter out the low-order harmonics and an LCL filter between DC/AC converter and grid to restrain the high-order harmonics. Based on the conventional PQ control,the weighted inverter-side and network-side inductive currents are used as the signals of inner-loop current control to lower the ripples of decoupled components,reduce the influence of the voltage-source characteristics of BESS and the impedance characteristics of LCL filter on the filtering effect and voltage waveform,and improve the control accuracy and response speed. An isolation transformer is used to adjust the output voltage of inverter for stabilizing the grid-connection voltage. A simulation model is built and the simulation results show that the power quality of BESS is effectively improved by the proposed dual-filter structure and control strategy.