在深入分析传统三维空间矢量脉宽调制(3D-SVPWM)算法的基础上，证明传统调制算法在运算过程中是可以简化的，并由此对传统调制算法进行改进，提出优化的 3D-SVPWM 调制算法． 采用所提出的优化 3D-SVPWM 调制算法，可以在保证系统效果和性能的前提下对传统调制算法进行大幅简化，有效降低调制算法的复杂度和计算量，提高调制算法的稳定性和实时性，减轻系统的软件负荷，为系统控制算法的改良和升级提供更多的可操作空间． 通过在三相四线制电容中分式有源电力滤波器中的仿真和实验，验证了所提出算法的可行性与优越性．

In this paper，the traditional three-dimensional space vector pulse width modulation (3D-SVPWM) al-
gorithm is deeply analyzed，and it is proved that the traditional algorithm can be simplified． Then，an optimized 3D-SVPWM algorithm is proposed． In comparison with the traditional algorithm，the optimized algorithm becomes extremely simplified and can guarantee the system performance． Moreover，it effectively reduces the complexity and the computation amount，and improves the instantaneity and the stability，which helps to alleviate the software load and thus provides more space for other control algorithms in the system． Finally，the feasibility and superiority of the proposed optimized algorithm are verified through the simulation and experiment in a three-phase four-wire center-spilt shunt active power filter．