Multiband SHEPWM Control Technology Based on Walsh Functions

Round 1

Reviewer 1 Report

1. Please, remove the references number 10 and number 15! Keep using references from the last ten years, and if possible it is better to cite papers from last three years. The electronics is dynamically changing field.

2. The conclusions have to be based on the results and discussion, and to be more precise.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

This paper deals with multi-band SHEPWM control method for multilevel inverter. This method bases on Walsh function. The results of simulation and experimental tests are presented in the article. These tests have been made to verify the proposed method and the correctness of the theoretical analysis. The proposed method will provide a useful tool in analysing and designing voltage source inverters based on SHEPWM.

On the other hand, the manuscript will be improved by some minor amendments, for example:

1. The sentence in line 37 can be improved.

2. The term "can’t" used in everyday speech can be replaced by "cannot".

3. The sentence in line 70 can be improved (probably by replacing "range" by "ranges").

4. In the sentence "The harmonic elimination model of multi-band SHEPWM are presented in […]" (lines 73 and 74) the word "are" should be replaced by "is".

5. In Table 1 and Figure 2 the capital "V" should be replaced by small "v" in accordance with the definition in line 82.

6. In the sentence "Then establish a harmonic elimination system of linear equations and solve the switch angle, the calculation steps are showed as follows" (lines 171 to 173) the word "showed" should be replaced by "shown".

7. Reformatting of Table 3 is suggested.

8. In the text the voltages are marked by "U" (lines 238, 242, 243, etc.), whereas in the graphs these voltages are marked by "V" (Figs. 5,6). Therefore, it would be nice if the authors could standardize markings.

In addition, the reviewer has some questions to the authors:

1. The authors wrote (lines 89 to 91): "It can be seen from the table that when the output levels of the phase voltage vAN are ±2E, ±E and 0, each unit has a redundant output state function". Are you sure that the level 0 has a redundant output state function?

2. In Figures 5b, 6b and 7b the spectral distributions of phase voltage and line-to-line voltage together with THD values are shown. They allow for comparison between the solutions proposed by the authors. What THD values can be obtainable using the other PWM methods, e.g. SVPWM?

3. In Figures 5b, 7b and especially 6b the voltage harmonic of the third order with the significant amplitude can be seen. This harmonic has negative impact on electric motors, i.e. potential load of inverters. Is it possible to consider the elimination of the third harmonic in the proposed control algorithm?

4. Have the simulation and experimental investigations been made for the inverter under load? What is the impact of load on the inverter behaviour?

5. Where is Figure 10 described in the paper in lines 310 to 315?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf