## 4 Analysis of the Simulation Results of the Proposed Method
### Calculation of Simulation Results and Error Analysis  
In the process of converting voltage to flux, this method can introduce errors, although it is possible to obtain the flux change curve of the converter core when the energy is released by the energy storage capacitor to determine the remanence measurement throughout the process. Specifically, when the flux value reaches 0 Wb, the current is still oscillating, indicating that the demagnetization process has not been fully completed. Therefore, directly calculating the difference between the starting point and the endpoint during the measurement process will lead to inaccurate remanence measurements and may affect the degaussing effect. In view of this, the degaussing hysteresis loop method is used to measure the remanence magnitude, which not only provides more accurate measurement results but also makes the method clearer and easier to understand from an intuitive point of view, which is convenient for actual measurement operations in the field [34; 35; 36]. In this case, the degaussing hysteresis loop is plotted based on the current and flux change data, and the result is shown in Figure 8.  
It can be seen that the change in the degaussing hysteresis loop is similar to the set hysteresis model, and it can be seen that the hysteresis curve is shrinking, which is in line with the principle of degaussing [10; 25; 37]. Figure 6: Current waveform diagram. Figure 7: Magnetic link waveform diagram. The calculation method can be understood as assuming that the original remanence, \(a\) Wb, corresponds to the starting point of remanence measurement, and the remanence after energy injection is \(b\) Wb, corresponding to the endpoint of remanence measurement. The starting point and the endpoint are on the ordinate axis, and the difference between the two can represent the change in remanence in the measurement process. When b = 0 (the external energy makes the remanence completely eliminated), the difference between the starting point and the endpoint (_a_ - _b_) Wb is the original remanence [38; 39]. In the specific calculation process, the process of determining the size of the remanence is as follows:  
1. Confirm the intersection of the hysteresis loop with the longitudinal axis (i = 0). 2. To determine the intersection point with the longitudinal axis (i = 0) in the dynamic hysteresis loop, two intersection points should be determined. One is the intersection point with the largest absolute value of the flux, which can be determined as the starting point of the measurement, and the other is the intersection point with the smallest absolute value of the flux, which can be determined as the endpoint of the measurement. 3. Calculate the amount of change in remanence during the drawing of the dynamic hysteresis loops. 4. Subtract the magnitude of the remanent flux represented by the two intersections to obtain the remanence measurement. The remanence values are calculated according to the above method, the data are shown in Figure 8, and the measurement results are shown in Table 2.  
From the error analysis, it can be seen that the error size can be controlled to within 5% by measuring the remanence by the degaussing hysteresis loop method, it has a good measurement accuracy under the condition of high remanence, and the remanence size is only \begin{table}
\begin{tabular}{c c c c} \hline
**Set the Remanence** & **Flux Value at the Starting** & **Measurement of** & **Error (\%)** \\
**Value** & **Point (Wb)** & **Remanence (Wb)** & **Error (\%)** \\ \hline
2290.7 Wb & 2231.165 Wb & 2228.181 & 2.09 \\
2054.3 Wb & 2094.832 Wb & 2091.848 & 2.42 \\
1818 Wb & 1863.71 Wb & 1860.726 & 3.24 \\
1781.7 Wb & 1731.013 Wb & 1728.029 & 4.54 \\ \hline \end{tabular}
\end{table} 
Table 2: Remanence measurements based on the dynamic hysteresis loops. Figure 8: Schematic diagram of remanence measurement based on the dynamic hysteresis loop.