改进式Z源轴带发电机并网逆变器

Improved Z-source grid-connected inverter of ship shaft generator

为了保证船舶电网的稳定,必须改善船舶轴带发电机的并网系统的性能,针对传统的并网逆变器的缺点,研究了一种改进式Z源逆变器,并将其应用到船舶轴带发电机并网系统中,得到传统逆变器所不具有的独特特性,能有效解决传统拓扑电路结构上的缺陷;同时在电网侧采用LCL滤波器,在不增加新的电流互感器的情况下,采用超前-滞后网络反馈滤波电容电压获得有源阻尼来抑制LCL滤波器的谐振,实现并网电流的快速跟踪,使船舶电网系统的可靠性大大增加。研究了改进式Z源逆变器的工作原理和轴带发电机并网系统的控制方法,最后通过仿真和实验论证了理论分析的正确性。

In order to guarantee the stability of the ship grid,this paper studies the working principle of the Z source inverter and the control strategy of tlie ship shaft generator grid-connected system.A Z-source inverter was studied and it was applied to the grid-connected system of tlie ship shaft generator.This Z-source inverter provided features that cannot be obtained in the traditional inverter.It effectively solved the defects of tlie traditional topological circuit structure.At tlie same time LCL filter was used in the power grid side.To avoid the use of tiie new current sensor,the active damping was obtained by the lead-lag network to suppress the resonance of LCL filter.The grid-connected current was fast tracked and the reliability of ship power system was greatly increased.Finaly the correctnes is verified by the simulation and experimental analysis.