Charge-discharge loss reduction method and device utilizing power receiver priority

Patent metadata

Field	Value
Publication number	US-12249853-B2
Application number	US-202118276614-A
Country	US
Kind code	B2
Filing date	Feb 10, 2021
Priority date	Feb 10, 2021
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A charge-discharge loss reduction device includes a power reception control device that controls power received or discharged by power receiving elements included in a load group, in a power system that supplies electric energy to the load group including the power receiving elements via a power supply base point. The power reception control device is configured to change a priority of an own power receiving element using a charge-discharge state of the own power receiving element, the priority indicating a degree to which power reception of the own power receiving element takes priority over power reception of another power receiving element.

First claim

The invention claimed is:

1. A charge-discharge loss reduction method of controlling power received or discharged by power receivers included in a load group, in a power system that supplies electric energy to the load group including the power receivers via a power supply base point, the charge-discharge loss reduction method comprising:
changing a priority of a power receiver based on whether the power receiver is performing charging or discharging, the priority indicating a degree to which power reception of the power receiver takes priority over power reception of another power receiver;
charging or discharging the power receiver with an amount of power, the amount of power determined based on an equation that includes a value of the priority;
acquiring information indicating differential power obtained by subtracting a current value of total transmission power transmitted to an entirety of the load group via the power supply base point, from a maximum value of the total transmission power transmittable to the entirety of the load group via the power supply base point;
upon the information indicating the differential power being a positive value, reducing the priority in a case where the power receiver is performing charging, compared to a case where the power receiver is performing discharging; and
upon the information indicating the differential power being a negative value, reducing the priority in a case where the power receiver is performing discharging, compared to a case where the power receiver is performing charging.

2. The charge-discharge loss reduction method according to claim 1 , comprising:
estimating whether a power receiver performing discharging is present among the power receivers connected to the power system, based on a rate of change of the information indicating the differential power;
upon the information indicating the differential power being a positive value, reducing an increase in an amount of power received by the power receiver from a normal increase in the amount of power in a case where the power receiver is performing charging and it is estimated that the power receiver performing discharging is present; and
upon the information indicating the differential power being a negative value, reducing an increase in an amount of power discharged by the power receiver from a normal increase in the amount of power in a case where the power receiver is performing discharging and it is estimated that the power receiver performing discharging is present, wherein the normal increase in the amount of power is defined as an increase in the amount of power in a case where it is not estimated whether the power receiver performing discharging is present.

3. A charge-discharge loss reduction device including a power reception control device that controls power received or discharged by power receivers included in a load group, in a power system that supplies electric energy to the load group including the power receivers via a power supply base point, wherein
the power reception control device is configured to:
change a priority of a power receiver based on the power receiver is performing charging or discharging, the priority indicating a degree to which power reception of the power receiver takes priority over power reception of another power receiver;
charge or discharge the power receiver with an amount of power, the amount of power determined based on an equation that includes a value of the priority;
acquire information indicating differential power obtained by subtracting a current value of total transmission power transmitted to an entirety of the load group via the power supply base point, from a maximum value of the total transmission power transmittable to the entirety of the load group via the power supply base point;
upon the information indicating the differential power being a positive value, reduce the priority in a case where the power receiver is performing charging, compared to a case where the power receiver is performing discharging; and
upon the information indicating the differential power being a negative value, reduce the priority in a case where the power receiver is performing discharging, compared to a case where the power receiver is performing charging.

Assignees

• Nissan Motor
• Renault Sas

Inventors

• Murai Kensuke
• Ikezoe Keigo
• Suzuki Kenta

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/50 Primary

  acting upon multiple batteries simultaneously or sequentially · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• B60L58/12

  responding to state of charge [SoC] · CPC title