An apparatus for providing power to a vehicle's electric power system comprises a converter (602) for converting electric input electricity having an input voltage into output electricity having an output voltage. A sense line (612) is provided for electrically connecting a control unit (611) to the vehicle's electric power system. A power line (613) is for connecting an output of the converter (602) in parallel to the vehicle's electric power system. The control unit (611) is configured to detect a running state of an alternator (201) of the vehicle based on a measurement of a signal on the sense line (612) and control the converter (602) to set the output voltage in dependence on the detected running state.

Systems and methods are provided for end-to-end infrastructure for supporting use of swappable batteries in electric vehicles. An end-to-end infrastructure for supporting use of electric vehicles may include one or more battery-swapping fueling stations. Each battery-swapping fueling station is configured to maintain one or more swappable batteries configured for operation in the electric vehicles, charge each of the one or more swappable batteries, when not fully charged, and swap, using the one or more swappable batteries, at least one battery of at least one electric vehicle when the at least one electric vehicle is refueling at the battery-swapping fueling station.

A power management system includes a first server configured to manage electric vehicle supply equipment in a microgrid and a second server configured to manage power supply and demand balance of a power system. The electric vehicle supply equipment is configured to execute a charging and discharging operation that suppresses a voltage fluctuation of the microgrid by exchanging power between the microgrid and a vehicle, and a reactive power compensation operation that suppresses a voltage fluctuation of the power system by controlling reactive power of the microgrid.

A power management system includes a first server configured to manage electric vehicle supply equipment in a microgrid and a second server configured to manage power supply and demand balance of a power system. The electric vehicle supply equipment is configured to execute a charging and discharging operation that suppresses a voltage fluctuation of the microgrid by exchanging power between the microgrid and a vehicle, and a reactive power compensation operation that suppresses a voltage fluctuation of the power system by controlling reactive power of the microgrid.

An electric power system includes a vehicle, a vehicle management server, an AC charging stand, a DC charging stand, and a charging stand management server. During AC charging and AC discharging, the AC charging stand is connected to the vehicle. An amount of charging power during AC charging and an amount of discharging power during AC discharging are calculated by the vehicle. The vehicle measures electric power before power conversion by an on-board charger, and calculates an amount of charging power and an amount of discharging power. An amount of charging power during DC charging and an amount of discharging power during DC discharging are calculated by the DC charging stand. The DC charging stand measures electric power before power conversion by a charger, and calculates an amount of charging power and an amount of discharging power.

An electric power system includes a vehicle, a vehicle management server, an AC charging stand, a DC charging stand, and a charging stand management server. During AC charging and AC discharging, the AC charging stand is connected to the vehicle. An amount of charging power during AC charging and an amount of discharging power during AC discharging are calculated by the vehicle. The vehicle measures electric power before power conversion by an on-board charger, and calculates an amount of charging power and an amount of discharging power. An amount of charging power during DC charging and an amount of discharging power during DC discharging are calculated by the DC charging stand. The DC charging stand measures electric power before power conversion by a charger, and calculates an amount of charging power and an amount of discharging power.

Embodiments of the present application provide a charging and discharging device. The charging and discharging device includes an AC/DC converter, a first DC/DC converter, a second DC/DC converter and a control unit. The control unit is used to: receive a first charging request, the first charging request including a first charging voltage and a first charging current; set output power of the first DC/DC converter based on the first charging voltage and the first charging current; turn on the second DC/DC converter if an SOC of the energy storage unit is greater than a first threshold to charge the battery by the energy storage unit; and adjust output power of the second DC/DC converter, so as to enable a voltage difference between a bus voltage and a bus balance voltage of the charging and discharging device to be less than or equal to a preset value.

Embodiments of the present application provide a charging/discharging apparatus, a method for charging a battery and a charging/discharging system, the charging-and-discharging apparatus including a bidirectional AC/DC converter, a first DC/DC converter, and a control unit, where the first DC/DC converter is a bidirectional DC/DC converter; and where the control unit is configured to: receive a first charging current sent by a BMS of a battery, control the bidirectional AC/DC converter and the first DC/DC converter according to the first charging current to charge the battery through an AC power; receive a first discharging current sent by the BMS and discharging a power of the battery according to the first discharging current; and receiving a second charging current sent by the BMS and control the bidirectional AC/DC converter and the first DC/DC converter according to the second charging current to charge the battery through the AC power.

An airport according to the present disclosure is an airport where a vehicle is provided. The vehicle includes external supply means for supplying power to outside, and the airport includes power receiving equipment capable of receiving power from the vehicle via the external supply means. The present disclosure provides an airport capable of receiving power from a vehicle provided in the airport in the event of a power failure due to a disaster.

An airport according to the present disclosure is an airport where a vehicle is provided. The vehicle includes external supply means for supplying power to outside, and the airport includes power receiving equipment capable of receiving power from the vehicle via the external supply means. The present disclosure provides an airport capable of receiving power from a vehicle provided in the airport in the event of a power failure due to a disaster.