# Bidirectional Charging for BEVs with Reconfigurable Battery Systems via a Grid-Parallel Proportional-Resonant Controller

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## Abstract

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## 1. Introduction

## 2. Materials and Methods

#### 2.1. Modular Multilevel Inverters

#### 2.2. Bidirectional Charging for Battery Electric Vehicles

#### 2.3. Grid-Parallel Control of an RBS Using a PR Controller

## 3. Simulation and Measurement Setup

#### 3.1. Simulation Setup

#### 3.2. Measurement Setup

#### 3.2.1. Laboratory Setup

#### 3.2.2. Full Power Setup

## 4. Results

#### 4.1. Simulation Results

#### 4.2. Measurement Setup Results

## 5. Discussion

## 6. Conclusions and Future Outlook

## Author Contributions

## Funding

## Institutional Review Board Statement

## Informed Consent Statement

## Data Availability Statement

## Conflicts of Interest

## Abbreviations

AC | Alternating Current |

BEV | Battery Electric Vehicle |

BMS | Battery Management System |

DAB | Dual-Active Bridge |

DC | Direct Current |

HV | High Voltage |

MLI | Multilevel Inverter |

MOSFET | Metal-Oxide Semiconductor Field Effect Transistor |

NMC | Nickel-Manganese-Cobalt-Oxide |

OBC | Onboard Charger |

PF | Power Factor |

PFC | Power Factor Correction |

PLL | Phase-Locked Loop |

PI | Proportional-Integral |

PR | Proportional-Resonant |

RBS | Reconfigurable Battery System |

SoC | State of Charge |

THD | Total Harmonic Distortion |

V2G | Vehicle to Grid |

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**Figure 2.**MATLAB/Simulink simulation structure. The system resembles the hardware setup under ideal conditions.

**Figure 3.**Hardware setup to test the system in a realistic operating scenario. One slave module and the battery emulators are shown in this setup.

**Figure 4.**Hardware setup to achieve full power during tests. The system is connected to an electronic AC load and real batteries are used within the slave modules. Eight slave modules are included to reach the full grid voltage.

**Figure 5.**Grid voltage, system voltage and system current during grid-parallel charging operations with 28 $\mathrm{V}$ RMS, 4 $\mathrm{A}$ RMS and 50 $\mathrm{Hz}$. Transient oscillations were not allowed.

**Figure 6.**Grid voltage, system voltage and system current during grid-parallel operation. Start-up with 28 V RMS, 0 $\mathrm{A}$ RMS and 50 Hz at 50 $\mathrm{m}$$\mathrm{s}$. Reference current increased to 4 $\mathrm{A}$ RMS at 90 $\mathrm{m}$$\mathrm{s}$.

**Figure 7.**System parameters during grid-parallel operation with a ${V}_{\mathrm{grid}}$ of 56 $\mathrm{V}$ RMS, ${I}_{\mathrm{sys}}$ of 4 $\mathrm{A}$ RMS and a grid frequency ${f}_{\mathrm{grid}}$ of 50 $\mathrm{Hz}$. Grid voltage (green), inverter voltage (yellow), inverter current (red) and current of a single battery cell (blue).

**Figure 8.**System parameters at operation startup with a ${V}_{\mathrm{grid}}$ of 56 $\mathrm{V}$ RMS, ${I}_{\mathrm{sys}}$ of 0 $\mathrm{A}$ RMS and ${f}_{\mathrm{grid}}$ of 50 $\mathrm{Hz}$. Grid voltage (green), inverter voltage (yellow), inverter current (red) and current of a single battery cell (blue).

**Figure 9.**System parameters at operation with a grid voltage of ${V}_{\mathrm{grid}}$ 230 $\mathrm{V}$ RMS, a system charging current ${I}_{\mathrm{sys}}$ of 7 $\mathrm{A}$ RMS and a grid frequency ${f}_{\mathrm{grid}}$ of 50 $\mathrm{Hz}$. Grid voltage (yellow), system voltage (green) and system current (red).

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## Share and Cite

**MDPI and ACS Style**

Buberger, J.; Hohenegger, M.; Estaller, J.; Wiedenmann, A.; Grupp, W.; Bliemetsrieder, W.; Kuder, M.; Lesnicar, A.; Weyh, T. Bidirectional Charging for BEVs with Reconfigurable Battery Systems via a Grid-Parallel Proportional-Resonant Controller. *Electricity* **2023**, *4*, 171-184.
https://doi.org/10.3390/electricity4020011

**AMA Style**

Buberger J, Hohenegger M, Estaller J, Wiedenmann A, Grupp W, Bliemetsrieder W, Kuder M, Lesnicar A, Weyh T. Bidirectional Charging for BEVs with Reconfigurable Battery Systems via a Grid-Parallel Proportional-Resonant Controller. *Electricity*. 2023; 4(2):171-184.
https://doi.org/10.3390/electricity4020011

**Chicago/Turabian Style**

Buberger, Johannes, Michael Hohenegger, Julian Estaller, Andreas Wiedenmann, Wolfgang Grupp, Wolfgang Bliemetsrieder, Manuel Kuder, Anton Lesnicar, and Thomas Weyh. 2023. "Bidirectional Charging for BEVs with Reconfigurable Battery Systems via a Grid-Parallel Proportional-Resonant Controller" *Electricity* 4, no. 2: 171-184.
https://doi.org/10.3390/electricity4020011