# A Three-Port Power Electronic Transformer Based on Magnetic Integration
## 6 Economic Benefits Analysis
### Device Cost Comparison
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameters** & **MMC + Distributed DABs PET** & **Proposed PET** \\ \hline Current stress of MMC device & \(\frac{1}{2}\)\(\frac{1}{3}\)\({}_{\text{HVDC}}+\frac{1}{2}\)\({}_{\text{HVAC}}\) & \(\frac{1}{3}\)\({}_{\text{HVDC}}+\frac{1}{2}\)\({}_{\text{HVAC}}+\frac{1}{2}\)\({}_{\text{HVAC}}\) \\  & (199A) & (275A) \\ \hline \multirow{2}{*}{Number, product type and costs of MMC IGBTs} & 6 \(N\) & 6 \(N\) \\  & FF2001R2K4E & FF3001R2K4 \\  & 180 \(\times\) 5112 \(=\) 520,160 & 180 \(\times\) 5135 \(=\) 524,300 \\ \hline \multirow{2}{*}{Current stress of DABs device (\(\varphi=\pi/4\))} & \(\frac{\eta_{\text{HVAC}}/(6N)}{\eta_{\text{HVDC}}(1-\eta/\pi)}\) & \(\frac{\eta_{\text{HVAC}}/3}{\eta_{\text{HVDC}}(1-\eta/\pi)}\) \\  & (4.9A) & (296A) \\ \hline \multirow{2}{*}{Number, product type and costs of DABs IGBTs} & 6 \(N\times 4\) & 3 \(\times\) 2 \\  & FF50012R174 & FF3001R2K4 \\  & 720 \(\times\) 546 \(=\) 633,120 & 6 \(\times\) 5135 \(=\) 5810 \\ \hline \multirow{2}{*}{Number, product type and costs of IGBTs drivers} & 6 \(N\times 4\) & 6 \(N+3\times 2\) \\  & 2 SP0115T2C0-12 & 2 SP0115T2C0-12 \\  & 900 \(\times\) 587 \(=\) 578,300 & 186 \(\times\) 587 \(=\) 516,182 \\ \hline \multirow{2}{*}{Number, product type and costs of MMC SMs} & 6 \(N\times 5\) & 6 \(N\times 5\) \\  & 947D112K102 DLRSN (1.1 mF) & 947D112K102 DLRSN (1.1 mF) \\  & 900 \(\times\) 5172 \(=\) 5154,800 & 900 \(\times\) 5172 \(=\) 5154,800 \\ \hline \multirow{2}{*}{
\begin{tabular}{c} DAB capacitor (@ voltage ripple \(\varepsilon=2\%\)) \\ \end{tabular} } & \(\frac{\eta_{\text{HVAC}}/3}{2\epsilon_{\text{HVAC}}/\pi}\) \\  & (62 uF) & (3700 uF) \\ \hline \multirow{2}{*}{Number, product type and costs of} & 6 \(N\times 1\) & 3 \(\times\) 4 \\  & C4 DRMAQ5600 AA0(f8 \(\mu\)F) & 947D102K102 DJRSN (1 mF) \\  & 180 \(\times\) 555 \(=\) 59900 & 12 \(\times\) 5161 \(=\) 51932 \\ \hline \multirow{2}{*}{Number, product type and costs of} & (6 \(N\times 6\)) \(\times\) 4 & (6 \(N+3\times 4\) \\  & HFBR1521z/HFBR2521z & HFBR1521z/HFBR2521z \\  & 1440 \(\times\) 58 \(=\) 511,520 & 732 \(\times\) 58 \(=\) 5856 \\ \hline \multirow{2}{*}{Number, product type and costs of auxiliary power supply (1 modules per SM or DAB)} & 6 \(N+6\) \(N\) & 6 \(N+3\) \\  & PV40-27B12 & PV40-27B12 \\  & 360 \(\times\) 530 \(=\) 510,800 & 183 \(\times\) 530 \(=\) 55490 \\ \hline \multirow{2}{*}{Number, product type and costs of A/D sampling (1 IC per SM or DAB)} & 6 \(N+6\) \(N\) & 6 \(N+3\) \\  & AD7606 BSTZ-4 RL \& ADR421 \\  & 360 \(\times\) 524 \(=\) 58640 & 183 \(\times\) 524 \(=\) 54392 \\ \hline \multirow{2}{*}{Number, product type and costs of} & 6 \(N+6\) \(N\) & 6 \(N+3\) \\  & LEMDVL 1000 & LEMDVL 1000 \\  & 360 \(\times\) 5252 \(=\) 590,720 & 183 \(\times\) 5252 \(=\) 546,116 \\ \hline \multirow{2}{*}{Number, product type and costs of controller IC (1 CPLD/FFGA IC per SM or DAB)} & 6 \(N+6\) \(N+3\) \\  & EPM1270 & EPM1270 \\  & 360 \(\times\) 538 \(=\) 513,680 & 183 \(\times\) 538 \(=\) 56954 \\ \hline \multirow{2}{*}{Number and costs of copper busbar (\(n+1\) busbar per arm, 4 busbar per DAB)} & 6(\(n+1\)) + 6 N \(\times\) 4 & 6(\(n+1\)) + 3 \(\times\) 2 \\  & 906 \(\times\) 535 \(=\) 531,710 & 192 \(\times\) 535 \(=\) 56720 \\ \hline \hline \end{tabular}  
* Notes: the device cost can be searched in \"[[https://octopart.com/](https://octopart.com/)]([https://octopart.com/](https://octopart.com/)) (accessed on 25 May 2022)\". The copper busbar is custom-made, and its cost is estimated by average value of existing prototype.  
\end{table} 
Table 3: Device cost comparison of proposed PET with existing typical PETs. Figure 13, the total cost of auxiliary components in the MMC + distributed DABs PET ($0.16 million) is much higher than the proposed PET ($0.07 million). In summary, although a slightly higher MMC IGBTs cost in proposed PET, there is a significant reduction in cost in DAB IGBTs, IGBT drivers and auxiliary components, in comparison with the MMC + distributed DABs PET.