Power transmission apparatus of hybrid electric vehicle

A power transmission apparatus for a hybrid electric vehicle may include an input shaft receiving an engine torque, first and second planetary gear sets respectively having first to third rotation elements fourth to sixth rotation elements, a first shaft fixedly connected to the first rotation element and the motor-generator and selectively connectable to the input shaft, a second shaft fixedly connected to the second and sixth rotation elements and selectively connectable to the input shaft, a third shaft fixedly connected to the third rotation element and selectively connectable to the transmission housing, a fourth shaft fixedly connected to the fourth rotation element and selectively connectable to the transmission housing, a fifth shaft fixedly connecting the fifth rotation element and an output gear and selectively connectable to the third shaft, and a plurality of engagement elements including at least one clutch and at least one brake. 混合动力电动车辆的动力传输装置包括：输入轴，接收发动机的扭矩；分别具有第一至第三旋转元件的第一行星齿轮组和具有第四至第六旋转元件的第