本文对多相多电平逆变器的峰-峰输出电流纹波幅度进行了分析和讨论。根据交流电压分量计算电流纹波，并根据开关周期内电压电平的电流斜率和应用次数定义峰峰值。给出了基波周期内峰-峰电流纹波分布随调制指数变化的详细解析表达式。在所有情况下，都参考了由基于载波或空间矢量PWM产生的中心对称开关模式。通过这种PWM策略，以简单有效的方式使直流母线利用率最大化，并得到一个近似最优的调制方式，使电流纹波均方根最小。从三相二电平逆变器输出电流纹波的定义和分析入手，将理论扩展到多相逆变器，重点研究了五相和七相逆变器。针对由串联RL阻抗和交流反电势组成的一般平衡多相负载，引入了瞬时电流纹波。定义了输出电流纹波最大值的简化有效表达式。给出并讨论了峰-峰电流纹波图。通过仿真和实验验证了分析结果的正确性。输出电流纹波的分析也扩展到多电平逆变器，特别是三相三电平逆变器。如前所述，最佳调制是根据电流纹波均方根最小化来确定的。此外，在这种情况下，对由串联RL阻抗和交流反电动势（RLE）组成的三相平衡系统进行了电流纹波分析，该系统代表了电机负载和并网应用。给出并讨论了峰-峰电流纹波图。此外，还进行了仿真和实验，验证了分析方法的有效性。对不同相数、不同电平的情况进行了比较，得出了一些有益的结论。并给出了一些应用实例。

Analysis of the peak-to-peak output currentripple amplitude for multiphase and multilevel inverters is presented anddiscussed in this PhD thesis. The current ripple is calculated on the basis ofthe alternating voltage component, and peak-to-peak value is defined by thecurrent slopes and application times of the voltage levels in a switchingperiod. Detailed analytical expressions of peak-to-peak current rippledistribution over a fundamental period are given as function of the modulationindex. For all the cases, reference is made to centered and symmetrical switchingpatterns, generated either by carrier-based or space vector PWM. By this PWMstrategy, the dc bus utilization is maximized in a simple and effective way,and a nearly-optimal modulation is obtained to minimize the current ripple RMS.Starting from the definition and the analysis of the output current ripple inthree-phase two-level inverters, the theoretical developments have beenextended to the case of multiphase inverters, with emphasis on the five- andseven-phase inverters. The instantaneous current ripple is introduced for ageneric balanced multiphase loads consisting of series RL impedance and ac backemf (RLE). Simplified and effective expressions to account for the maximum ofthe output current ripple have been defined. The peak-to-peak current ripplediagrams are presented and discussed. Both simulation and experimental resultsare carried out to prove the validity of the analytical developments. Theanalysis of the output current ripple has been extended also to multilevelinverters, specifically three-phase three-level inverters. The optimalmodulation has been identified with reference to current ripple RMS minimization,as in the previous cases. Also in this case, the current ripple analysis iscarried out for a balanced three-phase system consisting of series RL impedanceand ac back emf (RLE), representing both motor loads and gridconnectedapplications. The peak-to-peak current ripple diagrams are presented anddiscussed. In addition, simulation and experimental results are carried out toprove the validity of the analytical developments. The cases with differentphase numbers and with different number of levels are compared among them, andsome useful conclusions have been pointed out. Furthermore, some applicationexamples are given.

1. 引言

2. 三相二电平VSIs电流纹波分析

3. 多相VSIs输出电流纹波分析

4. 多电平VSIs输出电流纹波分析

5. 峰峰值电流纹波比较

6. 应用实例

7. 结论与未来工作展望

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