中文摘要：

为改善传统逆变器应用中需要采用工频变压器实现电气隔离和电压匹配，从而导致并联系统体积大、重量沉、效率低、动态响应特性差、及音频噪声大的缺点，以三相高频链矩阵式逆变器（HFLMI）为功率接口，在研究三相高频链矩阵式逆变器HFLMI并联的基础上提出一种新的功率滤波方法，该方法采用二阶广义积分器（SOGI）对坐标变换后的采样电压、电流进行滤波，用滤波后的量进行功率的计算。针对传统虚拟阻抗控制易使并联系统对电流噪声高度敏感的问题，研究基于SOGI的虚拟阻抗控制与改进前级功率滤波相结合的控制方法。仿真和实验验证所提控制方法的可行性和有效性。

英文摘要：

In order to improve the shortcoming in the application of traditional inverter, such as adopting the frequency transformer to realize electrical isolation and voltage matching, resulting in the disadvantages of large volume and weight, low efficiency, slow dynamic response characteristics and large audio noise. The three-phase high frequency chain matrix inverter （HFLMI） was used for the power interface; a new power filtering method was proposed based on the study of the HFLMI parallel connection of the three-phase high frequency chain matrix inverter. The method utilized the second order generalized integrator （SOGI）to filter the sampling voltage and current after the coordinate transformation, and calculated the power with the filtered quantity. Aiming at the problem that the traditional virtual impedance control was easy to make the parallel system highly sensitive to current noise, the control method based on SOGI virtual impedance control and improved pre-power filtering was studied. The feasibility and effectiveness of the proposed control method were verified by simulation and experiment.