中文摘要：

为改进非对称T型低通滤波器的电压型逆变器的设计，提出并实现了一种三雏状态变量的可视化的分析方法。首先由状态方程推算出其状态转移方程，然后将滤波器输入电压代入得到三个状态变量关于时间t的表达式，再将状态变量综合成为三维空间轨迹。所得图形不但能表明T型低通滤波器中各个变量之间的关系，还可用来判断系统的稳定性。实验波形和仿真结果验证了该方法的正确性和有效性。

英文摘要：

In order to improve the design method of non-symmetry T-network filter in Voltage Source Type Inverter, a 3-D visualization of state variable method the paper proposed. First, by using state equation.the state transition equation of system calculated. Then, the time expression of three state variables can be obtained by substituted the filter＇s input voltage UAB. Finally, the 3-Dloca and three-plane projection drawing of state variables were described. The picture not only shows the relation of T-network filter＇s state variables, but also indicates stability of the system. The experiment and simulation results validate that this method is right and effective.