Charge/discharge management device

• US 10,224,724 B2
• Filed: 10/21/2014
• Issued: 03/05/2019
• Est. Priority Date: 10/21/2014
• Status: Active Grant

• Current Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation (Toshiba Corporation)
• Inventors: Hanada, Masato, Tsurumaru, Daisuke
• Primary Examiner(s): Memula, Suresh
• Application Number:
  US15/516,507
• Publication Number:
  US 20180226812A1
• Time in Patent Office: 1,596 Days
• Field of Search: 320134
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A charge/discharge management device relating to the present invention is provided in equipment including a storage battery system. The storage battery system includes a plurality of PCS groups. Each of the PCS groups includes a storage battery, a BMU, and a PCS. The charge/discharge management device includes an operation time SOC calculation unit, a stop time SOC estimation unit, and an initial SOC resetting unit. The operation time SOC calculation unit calculates an operation time SOC for which an SOC based on an integrated value of a current value supplied from the BMU is added to an initial SOC of the storage battery, for each of the plurality of PCS groups. The stop time SOC estimation unit stops charge/discharge of the some group in the case that a stop condition is established, and thereafter, estimates a stop time SOC of the storage battery based on a voltage value supplied from the BMU for the some group. The initial SOC resetting unit resets the initial SOC that the operation time SOC calculation unit has with the stop time SOC, and resets the integrated value that the operation time SOC calculation unit has.

Claims

1. A charge/discharge management device provided in in-plant equipment including a storage battery system connected to an intra-equipment electric wire, and transmitting a charge/discharge command to the storage battery system based on a charge/discharge request from an energy management system managing at least in-plant electric power supply/demand,

wherein the storage battery system includes a plurality of PCS groups, and

wherein each of the PCS groups includes

a storage battery,

a battery management unit that monitors a state of the storage battery, and

a power conditioning system having a function of converting AC power outputted to the intra-equipment electric wire to DC power and charging the DC power to the storage battery, and a function of converting the DC power of the storage battery to the AC power and discharging the AC power to the intra-equipment electric wire,

the charge/discharge management device comprising:

an operation time SOC calculation unit that calculates an operation time SOC for which an SOC based on an integrated value of a current value supplied from the battery management unit is added to an initial SOC of the storage battery, for each of the plurality of PCS groups;

a stop condition determination unit that defines a condition that, even when charge/discharge of some group of the plurality of PCS groups is stopped, a total charge/discharge possible amount based on the operation time SOC of groups of PCS groups other than the some group is larger than a charge/discharge request amount requested from the energy management system as a stop condition, and determines whether or not the stop condition is established;

a stop time SOC estimation unit that stops the charge/discharge of the some group in the case that the stop condition is established, and thereafter, estimates a stop time SOC of the storage battery based on a voltage value supplied from the battery management unit for the some group; and

an initial SOC resetting unit that resets the initial SOC with the stop time SOC, and resets the integrated value, for the some particular group.

2. The charge/discharge management device according to claim 1, further comprising

a charge/discharge command unit that proportionately divides the charge/discharge request amount by the other groups and determines charge/discharge commands for the other groups, in the case that the stop condition is established.