# DC Energy Hubs for Integration of Community DERs, EVs, and Subway Systems

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## Abstract

**:**

## 1. Introduction

## 2. Electrified Transportation

#### 2.1. Subway

#### 2.2. Electric Vehicles

## 3. DC Energy Hub

#### 3.1. Motivation

#### 3.2. Third Rail Integration

#### 3.3. Topology

## 4. Control Framework

## 5. Results and Discussion

_{RMS}, with a peak of about 170-V.

## 6. Conclusions

## Author Contributions

## Funding

## Institutional Review Board Statement

## Informed Consent Statement

## Data Availability Statement

## Conflicts of Interest

## References

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**Figure 24.**An X-axis magnified view of the voltage profiles of the AC grid side of the inverter after sizing up.

**Figure 26.**An X-axis magnified view of the current profiles of the AC grid side of the inverter after sizing up.

Symbol | Quantity | Value |
---|---|---|

C_{F} | Capacitive Filter’s Capacitance | 1 mF |

R_{Rec} | Traction Rectifier’s Internal Resistance | 1.08 mΩ |

R_{3rd} | Third Rail’s Resistance | 25 mΩ |

R_{Run} | Running Rail’s Resistance | 12 mΩ |

R_{Aux} | AC Auxiliary Load’s Resistance | 40 Ω |

L_{F} | RL Filter’s Inductance | 3 mH |

R_{F} | RL Filter’s Resistance | 1 Ω |

C_{DC} | DC Bus Capacitor’s Capacitance | 12 mF |

R_{DC} | DC Bus Resistor’s Resistance | 60 Ω |

C_{PV1} | Boost Converter Capacitor 1′s Capacitance | 0.27 mF |

C_{PV2} | Boost Converter Capacitor 2′s Capacitance | 0.27 mF |

L_{PV} | Boost Converter Inductor’s Inductance | 8.5 mH |

R_{Batt} | Battery’s Internal Resistance | 5 mΩ |

L_{L} | Buck-Boost Converter Inductor’s Inductance | 0.8 mH |

C_{L} | Buck-Boost Converter Capacitor’s Capacitance | 1.2 mF |

R_{L} | EV Load’s Equivalent Resistance | 20 Ω |

K_{p} | Buck-Boost PI Controller’s Proportional Gain Value | 0.001 |

K_{i} | Buck-Boost PI Controller’s Integral Gain Value | 0.1 |

Kp_{PIdc} | PI_{DC} Controller’s Proportional Gain Value | 0.1 |

Ki_{PIdc} | PI_{DC} Controller’s Integral Gain Value | 1 |

Kp_{PIIq} | PI_{Iq} Controller’s Proportional Gain Value | 30 |

Ki_{PIIq} | PI_{Iq} Controller’s Integral Gain Value | 240 |

Kp_{PIId} | PI_{Id} Controller’s Proportional Gain Value | 30 |

Ki_{PIId} | PI_{Id} Controller’s Integral Gain Value | 240 |

Seq | Repeating Sequence 1′s Frequency | 10 kHz |

Seq | Repeating Sequence 1′s Range | [0, 1] |

Seq_{2} | Repeating Sequence 2′s Frequency | 10 kHz |

Seq_{2} | Repeating Sequence 2′s Range | [−1, 1] |

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**MDPI and ACS Style**

Ahmad, R.; Mohamed, A.A.A.; Rezk, H.; Al-Dhaifallah, M. DC Energy Hubs for Integration of Community DERs, EVs, and Subway Systems. *Sustainability* **2022**, *14*, 1558.
https://doi.org/10.3390/su14031558

**AMA Style**

Ahmad R, Mohamed AAA, Rezk H, Al-Dhaifallah M. DC Energy Hubs for Integration of Community DERs, EVs, and Subway Systems. *Sustainability*. 2022; 14(3):1558.
https://doi.org/10.3390/su14031558

**Chicago/Turabian Style**

Ahmad, Rohama, Ahmed Ali A. Mohamed, Hegazy Rezk, and Mujahed Al-Dhaifallah. 2022. "DC Energy Hubs for Integration of Community DERs, EVs, and Subway Systems" *Sustainability* 14, no. 3: 1558.
https://doi.org/10.3390/su14031558