中文摘要：

为了提高级联型静止无功发生器（SVG）的消谐性能,在4个PAM环节的基础上加入了一个PWM环节,并考虑到PAM单元的直流侧电压波动受导通宽度影响较大,提出了一种新的非中心对称的脉冲循环方式。在此种方式下,4个PAM桥的导通宽度两两相等,这一特性使得各PAM桥脉冲之间可以进一步分立轮换,有利于抑制直流侧电压的波动从而降低输出电流的谐波。最后,通过PSCAD建立链式SVG仿真模型并且五级联SVG试验原型验证了所提方法的有效性。

英文摘要：

This paper adopted PAM ＋ PWM hybrid modulation method in a five cascade SVG. The only PWM was added to improve the harmonic elimination. To balance the DC-side voltage, pulses were usually rotated in cyclic way for PAM units. The paper put forward a new method to rotate the pulses in an asymmetric way which improves the equivalent switching frequency to two times and reduces the fluctuations of the DC-side voltage. Finally, PSCAD simulation results and the SVG experimental prototype prove the validity of this method.