AUXILIARY POWER SYSTEM

• US 20160064970A1
• Filed: 08/31/2015
• Published: 03/03/2016
• Est. Priority Date: 09/03/2014
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Shimizu, Yukihiro
• Granted Patent: US 9,768,642 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 11/00 Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02P 80/20 using renewable energy

Abstract

According to aspects of embodiments of the present invention, an auxiliary power system includes: a plurality of storage batteries having different charge/discharge characteristics; a receiving unit configured to externally receive a value for instructing to charge/discharge power for charging/discharging the plurality of storage batteries; and a control unit configured to calculate an indicator value indicating a spread degree of distribution of the value for instructing to charge/discharge power and to change the storage batteries to be charged/discharged from the plurality of storage batteries according to the indicator value.

Claims

1. An auxiliary power system comprising:

a plurality of storage batteries having different charge/discharge characteristics;

a receiving unit configured to externally receive a value for instructing to charge/discharge power for charging/discharging the plurality of storage batteries; and

a control unit configured to calculate an indicator value indicating a spread degree of distribution of the value for instructing to charge/discharge power and to change the storage batteries to be charged/discharged from the plurality of storage batteries according to the indicator value.

2. The auxiliary power system of claim 1, wherein the plurality of storage batteries comprises:

a first storage battery in which more power charging/discharging is performed with respect to electrical capacitance; and

a second storage battery in which less power charging/discharging is performed with respect to the electrical capacitance than in the first storage battery, wherein the control unit, after comparing a threshold value based on the indicator value with the value for instructing to charge/discharge power, is configured to charge/discharge the first storage battery when an absolute value of the value for instructing to charge/discharge power is greater than an absolute value of the threshold value, and to charge/discharge the second storage battery when an absolute value of the value for instructing to charge/discharge power is smaller than an absolute value of the threshold value.

3. The auxiliary power system of claim 1, wherein the control unit is configured to control electrical capacitance of the storage battery to approximate a target value.

4. The auxiliary power system of claim 1, wherein the control unit is configured to calculate the indicator value according to the value for instructing to charge/discharge power during a control reference period according to an installation condition of the auxiliary power system.

5. The auxiliary power system of claim 1, wherein the control unit is configured to calculate a normal distribution by calculating a standard deviation as the indicator value when applying the value for instructing to charge/discharge power to a normal distribution.

6. The auxiliary power system of claim 5, wherein the control unit is configured to multiply a deviation value based on the standard deviation and an occurring frequency of the normal distribution to calculate an estimated distribution of an amount of power charged/discharged.

7. An auxiliary power system comprising:

a plurality of storage batteries having different charge/discharge characteristics;

a receiving unit configured to receive generated power data corresponding to an amount of power generated via an external power generation system;

a calculation unit configured to calculate target charge/discharge power data corresponding to a required amount of power charged/discharged based on a predetermined number of recently received pieces of generated power data and to calculate a probability distribution from a group of the target charge/discharge power data; and

a control unit configured to selectively charge/discharge the plurality of storage batteries based on the probability distribution.

8. The auxiliary power system of claim 7, wherein the calculation unit is configured to calculate an estimated distribution of the charge/discharge power data of a following second period, and the control unit is configured to selectively charge/discharge the plurality of storage batteries according to the estimated distribution of the charge/discharge power data.

9. The auxiliary power system of claim 8, wherein the estimated distribution of the charge/discharge power data is calculated by multiplying a deviation value and an occurring frequency of the probability distribution.

10. The auxiliary power system of claim 9, wherein the plurality of storage batteries comprise a first storage battery and a second storage battery, a threshold value is calculated based on SOC values of the first and second storage batteries and the estimated distribution of the charge/discharge power data, and the control unit is configured to control charge/discharge of the first and second storage battery based on the threshold value.

11. The auxiliary power system of claim 10, wherein a charge/discharge rate of the first storage battery is greater than that of the second storage battery, and

the control unit is configured to charge/discharge the first storage battery when an absolute value of a value of the target charge/discharge power data is greater than an absolute value of the threshold value, and to charge/discharge the second storage battery when an absolute value of a value of the target charge/discharge power data is less than an absolute value of the threshold value.