Charging system and charging device

Abstract

The invention provides a charging system and a charging device. The charging system is cheap, can utilize energy efficiently, and reduces the risk. The charging device that is connected to a battery that stores DC power is taken as a basic unit of the charging system. Electric power exchange is performed between multiple charging devices that are connected by a DC connection bus, wherein the charging devices are connected to the DC connection bus through a first bidirectional DC / DC converter. The first bidirectional DC / DC converter has a discharging characteristic that the discharging currentdecreases when the grid voltage of the DC connection bus increases, during the discharging process; and has a charging characteristic that the charging current increases when the grid voltage increases, during the charging process; wherein in the discharging characteristic, the current of the discharging direction is defined as positive, in the charging characteristic, the current of the chargingdirection is defined as positive, and the charging characteristic and the discharging characteristic are intersected.

Description

technical field [0001] The present invention relates to a power storage system and a power storage device for exchanging electric power among a plurality of distributed power storage devices. Background technique [0002] In recent years, as a utilization method of natural energy, shifting to a self-consumption (household consumption) system instead of grid interconnection is expected. As a self-consumption system, for example, a power storage device that stores electric power generated by a solar cell device at a disaster prevention site is considered. [0003] Furthermore, studies have been made on autonomous distributed power networks in which these power storage devices are distributed, and techniques for controlling power exchange between power storage devices have been proposed (see, for example, Patent Document 1). [0004] Patent Document 1: Japanese Patent Laid-Open No. 2006-288162 [0005] However, in the prior art, control of power exchange between customers is ...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, the control of power exchange between customers is centrally managed within the customer group

Therefore, the power exchange control of the entire system cannot be performed due to the downtime of the controller that centrally manages the power exchange control, so there are problems in system efficiency and risk management

Images