三相四线制中点箝位(Neutral-Point Clamped, NPC)型三电平四桥臂有源电力滤波器(Active Power Filter, APF)采用三维空间矢量调制(3-Dimensional Space Vector Pulse Width Modulation, 3D-SVPWM)策略可以高效地改善电能质量，减少谐波含量。但由于其复杂的拓扑结构，造成运算过程中响应时间过长的问题。针对这一问题，提出了一种简化的3D-SVPWM调制策略。该策略通过降维的方法，分别对前三相桥臂采用3D-SVPWM调制策略，对N相桥臂采用载波层叠PWM调制策略，确定触发脉冲信号。相较传统调制算法，新的调制策略缩短了计算空间矢量的作用时间，减少整体过程的响应时间，并且保证了开关时序的一致。通过MATLAB/Simulink仿真实验结果验证了文章提出的算法的正确性和可行性。
英文摘要:
Neutral-point clamped (NPC) three-level four-leg active power filter (APF) using three-dimensional space vector pulse width modulation (3D-SVPWM) strategy can efficiently improve power quality and reduce harmonic content. However, due to its complex topology structure, the response time is too long during the operation. Aiming at this problem, a simplified 3D-SVPWM modulation strategy is proposed in this paper. This strategy adopts the 3D-SVPWM modulation strategy for the front three-phase bridge arm and the switch sequence control strategy for the N-phase bridge arm through the dimension reduction method, and the trigger pulse signal is determined. Compared with the traditional modulation algorithm, the novel modulation strategy shortens the action time of the computation space vector, reduces the overall response time, and ensures the consistency of the switching time sequence. The correctness and feasibility of the proposed algorithm are verified by MATLAB/Simulink simulation results.