CONTROL METHOD OF SODIUM-SULFUR BATTERY

• US 20080076010A1
• Filed: 09/18/2007
• Published: 03/27/2008
• Est. Priority Date: 09/27/2006
• Status: Abandoned Application

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: SATO, Mitsuharu
• Application Number:
  US11/856,787
• Publication Number:
  US 20080076010A1
• Time in Patent Office: Days
• US Class Current: 429/61
• CPC Class Codes: H01M 10/3909 Sodium-sulfur cells
• CPC Class Codes: H01M 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 2300/20 The dispersed energy generation being of renewable origin
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• 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 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

There is disclosed a method of precisely controlling a discharge capacity of a sodium-sulfur battery in an interconnection system where a power generation device in which an output fluctuates is combined with a power storage compensation device including a plurality of sodium-sulfur batteries. The sodium-sulfur battery in which a discharge capacity control value is to be corrected or reset is specified among the plurality of sodium-sulfur batteries, the discharge capacity control value of the specified sodium-sulfur battery is corrected, and all of the plurality of sodium-sulfur batteries is successively specified to repeatedly correct or reset the discharge capacity control value.

Claims

1. A control method of a plurality of sodium-sulfur batteries, comprising:

providing an interconnection system where a power generation device in which the output fluctuates is combined with a power storage compensation device to supply an electric power to a power system, the plurality of sodium-sulfur batteries comprising the power storage compensation device and compensating a fluctuation of an output of the power generation device,

specifying the sodium-sulfur battery in which a discharge capacity control value is to be corrected or reset, among the plurality of sodium-sulfur batteries;

correcting or resetting the discharge capacity control value of the specified sodium-sulfur battery; and

successively specifying all of the plurality of sodium-sulfur batteries to repeatedly correct or reset the discharge capacity control value.

2. The control method of the sodium-sulfur battery according to claim 1, wherein a vicinity of the end of charging or discharging is detected to correct or reset the discharge capacity control value.

3. The control method of the sodium-sulfur battery according to claim 2, wherein the vicinity of the end of the charging or the discharging is detected based on a voltage of the battery which is being operated.

4. The control method of the sodium-sulfur battery according to claim 3, wherein the vicinity of the end of the charging is detected in a case where a discharge capacity is larger than 0% and less than 10% of a battery rated capacity, and the vicinity of the end of the discharging is detected in a case where the discharge capacity is larger than 60% and less than 100% of the battery rated capacity.

5. The control method of the sodium-sulfur battery according to claim 1, wherein the output of the power generation device in which the output fluctuates is preferentially assigned to the specified sodium-sulfur battery up to an allowable maximum input to charge the specified sodium-sulfur battery.

6. The control method of the sodium-sulfur battery according to claim 1, wherein an order of priority to correct or reset the discharge capacity control value is beforehand set to the plurality of sodium-sulfur batteries, and the order of priority of the sodium-sulfur battery in which the discharge capacity control value has been corrected or reset is lowered to the last order thereafter.

7. The control method of the sodium-sulfur battery according to claim 6, wherein the output of the power generation device in which the output fluctuates is assigned to the sodium-sulfur battery in the order of priority up to the allowable maximum input to charge the sodium-sulfur battery.

8. The control method of the sodium-sulfur battery according to claim 1, wherein the power generation device in which the output fluctuates is a natural energy power generation device in which one or two or more types of natural energy selected from the group consisting of a wind power, a sunlight and a geothermal power is used.