## 3 Results
### Implementation Results
#### 3.2.2 Seven-Level CHBMII Results  
Concerning the outcomes derived from the seven-level experimental configuration, an illustrative representation of the output voltage waveform is comprehensively displayed in Figure 21 and with a resistive load of R = 250 \(\Omega\), offering a vivid depiction of the distinctive characteristics inherent to the seven-level CHBMII. As we observe this graphical representation, we can discern that, akin to the findings obtained from the five-level CHBMII analysis, the output voltage waveform exhibits remarkable symmetry, and its frequency closely aligns with the nominal 60 Hz standard. It can also be observed that the peak voltage in this configuration reaches a magnitude of 180 V. Meanwhile, Figure 22 shows the current waveform with the resistive load of R = 250 \(\Omega\).  
Figure 21: Seven-level CHBMII output voltage with R = 250 \(\Omega\).  
Figure 20: Fast Fourier Transform of the five-level CHBMII output voltage with the RL load.  
Similar to the findings observed in the five-level configuration, a comprehensive assessment of the THD was conducted in the seven-level setup using the sophisticated Power Quality Analyzer Fluke 435. Notably, in this specific instance, the THD measurement yielded a value of 10.5%, which is visually presented and elaborated upon in Figure 23. It is worth highlighting that, upon closer examination, it becomes evident that the third harmonic component exhibited a somewhat sporadic reduction in this particular case. However, as previously elucidated, it is essential to emphasize that the OMTHD method's primary objective is not explicitly geared toward eliminating or systematically reducing low-order harmonics. But, rather, its principal focus resides in the overarching goal of mitigating and diminishing the THD across the entire spectrum of harmonics, thus enhancing the overall quality and fidelity of the electrical waveform under analysis. This nuanced distinction underscores the multifaceted nature and strategic intent of the OMTHD methodology.  
Figure 23: Fast Fourier Transform of the seven-level CHBMIL output voltage with R = 250 \(\Omega\).  
Figure 22: Seven-level CHBMIL output current with R = 250 \(\Omega\).  
Then, a 100 \(\Omega\) resistive load was connected to the CHBMLI. Figure 24 shows the output voltage; the output current can be observed in Figure 25. The output voltage waveform keeps the same shape as the 250 \(\Omega\) resistive load.  
Figure 26 shows the THD with the resistive load of 100 \(\Omega\); it can be seen that this value, as well as the harmonic spectrum, is the same as the one shown in Figure 23.  
Figure 24: Seven-level CHBMLI output voltage with R = 100 \(\Omega\).  
Figure 25: Seven-level CHBMLI output current with R = 100 \(\Omega\).  
As with the five-level CHBMILI, an RL load consisting of a 100 \(\Omega\) resistor and a brushless AC motor was also connected. The characteristics of the motor have already been previously stated. Figure 27 shows the output voltage waveform, while Figure 28 shows the current waveform. Because this is an RL load, the current waveform differs from the voltage waveform.  
Figure 26: Fast Fourier Transform of the seven-level CHBMILI output voltage with R = 100 \(\Omega\).  
Figure 27: Seven-level CHBMILI output voltage with R = 100 \(\Omega\).  
Regarding the THD value for the RL load, the obtained value of 10.5% can be observed in Figure 29.