中文摘要：

为了提高传统五相电压源逆变器的直流电压利用率,在两电平逆变器拓扑结构的基础上提出了五相Z源逆变器的电路拓扑结构.逆变器利用Z源网络的升压特性,在开关切换时刻插入直通状态,使直流母线电压升高,从而提高了五相电压源逆变器的直流电压利用率和电压传输比.为减小逆变器输出电压谐波,采用优化的空间矢量调制算法对五相Z源逆变器进行调制,其中通过最小化三次谐波子空间的合成矢量来使输出电压的谐波减小.利用SIMULINK对五相Z源逆变器进行仿真,并采用基于数字信号处理器（digital signal processo,DSP）控制的实验平台对其进行实验验证.仿真和实验结果验证了该逆变器的可行性和调制算法的有效性.五相Z源逆变器能提高逆变器直流电压的利用率,可以用于直流电压受限的场合.

英文摘要：

To increase the DC voltage utilization ratio of traditional five-phase voltage source inverter （VSI）,the five-phase Z-source VSI topology,which is based on the traditional five-phase two-level VSI,is proposed.This inverter exploited the boost characteristic of the Z-source network to increase the DC voltage utilization ratio and the voltage transfer ratio.To reduce the harmonic waveform of the output voltage,optimized space vector modulation scheme was employed.By minimizing the synthesized vector in the third-order harmonic subspace,harmonic can be greatly reduced.The proposed five-phase Z-source inverter was studied by simulation,and experiment was carried out on digital signal processor （DSP） controlled platform.The feasibility of the inverter and the effectiveness of the modulation scheme was proved by simulation and experimental results.Finally,five-phase Z-source VSI can improve the DC voltage utilization ratio,and it can be applied in the field where DC voltage is limited.