本文提出了一種新型Z 源光伏并網發電系統，與傳統的Z 源光伏并網發電系統相比，具有更高的功率密度，同時光伏電池與逆變橋臂實現了共地，電磁干擾(EMI)也更小。分析了該發電系統的工作原理和調制策略，并提出了一種能夠維持直流鏈峰值電壓恒定的并網控制策略，實現了光伏電池的最大功率點跟蹤(MPPT)、直流鏈電壓的升壓以及網側電流的單位功率因數運行。仿真和實驗結果驗證了新型Z 源光伏并網發電系統能夠適應光伏電池電壓的寬范圍變化，具有很好的應用前景。
Abstract: This paper proposes a grid-connected PV system based on the new Z-source inverter,which has higher power density when
compared with traditional Z-source grid-connected PV system.In this system,PV array and inverter are common ground, thus EMI is
limited.The operation principle and control strategy are presented.This paper also proposes a control strategy to maintain DC-link peak
voltage value. This system is able to track the MPP of PV array dynamicly,boost DC-link peak voltage value,synchronize output current
with grid voltage,thus transforms power to utility grid with a high power factor. Simulation and experimental results demonstrate that the
new Z-source inverte grid-connected PV system,which could adapt well to large-scale variety of PV arry output voltage,has a great future..
關鍵詞：Z 源逆變器，光伏，并網，空間矢量調制
Key words: Z-source inverter, PV, grid-connected,SVPWM