Charging and discharging device and charging and discharging method

Patent metadata

Field	Value
Publication number	US-11329500-B2
Application number	US-202016747541-A
Country	US
Kind code	B2
Filing date	Jan 21, 2020
Priority date	Jan 30, 2019
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A charging-and-discharging device and a charging-and-discharging method are provided. The charging-and-discharging device includes a renewable energy converter, an aluminum battery, a controller and a current converter. The renewable energy converter receives a power from a renewable energy power generation system. The controller is coupled to the renewable energy converter and the aluminum battery, wherein the controller configures a charging-and-discharging power of the aluminum battery, according to a power value of the power, to compensate the power so as to generate a compensated power. The current converter is coupled to the controller, wherein the current converter outputs the compensated power to a power grid after performing DC/AC converting.

First claim

The invention claimed is:

1. A charging-and-discharging device adapted to a renewable energy power generation system, comprising:
a renewable energy converter, receiving a power from the renewable energy power generation system;
an aluminum battery;
a controller, coupled to the renewable energy converter and the aluminum battery, wherein the controller configures a charging-and-discharging power of the aluminum battery according to a power value of the power so as to generate a compensated power; and
a current converter, coupled to the controller, wherein the current converter outputs the compensated power to a power grid after performing DC/AC converting,
wherein the controller generates a fitting curve of the power according to the power value of the power, and configures the charging-and-discharging power of the aluminum battery according to the fitting curve so as to compensate the power.

2. The charging-and-discharging device according to claim 1 , wherein the controller calculates a compensation value according to a difference between a current power value of the power and a function value of the fitting curve, and compensates the power according to the compensation value.

3. The charging-and-discharging device according to claim 2 , wherein the controller determines that the compensation value is a negative value in response to the current power value greater than the function value of the fitting curve, and determines that the compensation value is a positive value in response to the current power value less than the function value of the fitting curve.

4. The charging-and-discharging device according to claim 2 , wherein in response to a ratio of the difference and the current power value greater than or equal to a first margin, and the function value of the fitting curve greater than zero, the controller determines that the compensation value is equal to the first margin, wherein the first margin is defined as a maximum positive rate of change of the power.

5. The charging-and-discharging device according to claim 4 , wherein in response to the ratio of the difference and the current power value greater than or equal to a second margin, and the function value of the fitting curve less than zero, the controller determines that an absolute value of the compensation value is equal to the second margin, wherein the second margin is defined as a maximum negative rate of change of the power.

6. The charging-and-discharging device according to claim 4 , wherein in response to the ratio of the difference and the current power value less than the first margin, and the function value of the fitting curve greater than zero, the controller determines that the compensation value is equal to the ratio.

7. The charging-and-discharging device according to claim 5 , wherein in response to the ratio of the difference and the current power value less than a second margin and the function value of the fitting curve less than zero, the controller determines that the absolute value of the compensation value is equal to the ratio.

8. The charging-and-discharging device according to claim 2 , wherein in response to a ratio of the difference and the current power value greater than or equal to a maximum charging rate of the aluminum battery, and the function value of the fitting curve less than zero, the controller determines that an absolute value of the compensation value is equal to the maximum charging rate.

9. The charging-and-discharging device according to claim 2 , wherein in response to a ratio of the difference and the current power value greater than or equal to a maximum discharging rate of the aluminum battery, and the function value of the fitting curve greater than zero, the controller determines that the compensation value is equal to the maximum discharging rate.

10. The charging-and-discharging device according to claim 5 , wherein values of the first margin and the second margin of the power are different.

11. The charging-and-discharging device according to claim 10 , wherein a capacity of the aluminum battery is configured based on a wattage corresponding to a historical maximum rate of change of an output power of the renewable energy power generation system, wherein a field capacity of the renewable energy converter multiplied by the maximum positive rate of change is a rising norm value, and the field capacity multiplied by the maximum negative rate of change is a falling norm value.

12. The charging-and-discharging device according to claim 1 , wherein a C-rate of the aluminum battery is between 10 C and 60 C.

13. A charging-and-discharging method adapted to a renewable energy power generation system, comprising:
receiving a power from the renewable energy power generation system;
configuring a charging-and-discharging power of an aluminum battery according to a power value of the power so as to generate a compensated power; and
outputting the compensated power to a power grid after performing DC/AC converting,
wherein the step of configuring the charging-and-discharging power of the aluminum battery according to the power value of the power so as to generate the compensated power comprises:
generating a fitting curve of the power according to the power value of the power, and configuring the charging-and-discharging power of the aluminum battery according to the fitting curve so as to compensate the power.

14. The charging-and-discharging method according to claim 13 , wherein the step of generating the fitting curve of the power according to the power value of the power, and configuring the charging-and-discharging power of the aluminum battery according to the fitting curve so as to compensate the power comprises:
calculating a compensation value according to a difference between a current power value of the power and a function value of the fitting curve, and compensating the power according to the compensation value.

15. The charging-and-discharging method according to claim 14 , wherein the step of calculating the compensation value according to the difference between the current power value of the power and the function value of the fitting curve comprises:
determining that the compensation value is a negative value in response to the current power value greater than the function value of the fitting curve, and determining that the compensation value is a positive value in response to the current power value less than the function value of the fitting curve.

16. The charging-and-discharging method according to claim 14 , wherein the step of calculating the compensation value according to the difference between the current power value of the power and the function value of the fitting curve comprises:
in response to a ratio of the difference and the current power value greater than or equal to a first margin, and the function value of the fitting curve greater than zero, determining that the compensation value is equal to the first margin, wherein the first margin is defined as a maximum positive rate of change of the power.

17. The charging-and-discharging method according to claim 16 , wherein the step of calculating the compensation value according to the difference between the current power value of the power and the function value of the fitting curve further comprises:
in response to the ratio of the difference and the current power value greater than or equal to a second margin, and the function value of the fitting curve less than zero, determining that an absolute value of the compensation value is equal to the second margin, wherein the second margi

Assignees

• Ind Tech Res Inst

Inventors

• Kuo Shu-Wei
• Yang Chang-Chung

Classifications

• H02J2101/24

  Photovoltaics · CPC title

• H02J7/90

  Regulation of charging or discharging current or voltage · CPC title

• H02J3/381

  Dispersed generators · CPC title

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• H02J3/32

  using batteries or super capacitors with converting means · CPC title