Wind Power Generation System, Wind Power Generation Control Device and Wind Power Generation Control Method

• US 20140042747A1
• Filed: 08/08/2013
• Published: 02/13/2014
• Est. Priority Date: 08/10/2012
• Status: Active Grant

• Current Assignee: Hitachi Power Solutions Co., Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Power Solutions Co., Ltd. (Hitachi, Ltd.)
• Inventors: HOSHIHIRA, Yugo, HOSHINO, Naoki, TAKAHASHI, Masaya, KONDOU, Shinichi, KUSUNO, Nobuhiro
• Granted Patent: US 8,970,058 B2
• Time in Patent Office: Days
• US Class Current: 290/50
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02P 2101/15 for wind-driven turbines
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

For reducing a storage capacity of a storage battery system and an installation cost at a constant-output control type of wind power plant, a wind power generation control device sets as a planned generation power value PT: an average wind generated power value PA, when a current battery charging rate SOC of the storage battery system is within the range of the upper and lower limit values of the targeted battery charging rate range SOCT (S12); a value obtained by multiplying a positive constant greater than 1 to the said PA, when the current battery charging rate SOC is above the upper limit value of the said SOCT (S14): and a value obtained by multiplying a positive constant less than 1 to the said PA, when the current battery charging rate SOC is below the lower limit value of the said SOCT (S15).

Claims

1. A wind power generation system comprising:

a wind power generator group composed of a plurality of wind power generators;

a storage battery system composed of a plurality of batteries; and

a wind power generation control device that performs a control so that a system generated power, obtained by adding a wind generated power generated by the wind power generator group and a charge-discharge power charged and discharged by the storage battery system, falls within an allowable range of a planned generation power value set in advance, over the charge-discharge power,

wherein the wind power generation control device comprises;

an average value operation unit that calculates an average value of the wind generated power generated by the wind power generator group during a first control period before the present time;

a targeted SOC (State Of Charge) range operation unit that calculates a targeted battery charging rate range of the storage battery system; and

a planned generation power value operation unit that calculates a planned generation power value for a second control period which is set later than the present time, based on the average value of the wind generated power calculated by the average value operation unit,

wherein the planned generation power value operation unit sets as the planned generation power value;

the average value of the wind generated power, when a current battery charging rate of the storage battery system is in the range of the upper and lower limit values of the targeted battery charging rate range;

a value obtained by multiplying a positive constant greater than 1 to the average value of the wind generated power, when the current battery charging rate of the storage battery system is above the upper limit value of the targeted battery charging rate range; and

a value obtained by multiplying a positive constant less than 1 to the average value of the wind generated power, when the current battery charging rate of the storage battery system is below the lower limit value of the targeted battery charging rate range.

2. The wind power generation system according to claim 1,

wherein the wind power generation control device further comprises

a predicted generation power operation unit that is connected to a wind prediction device that predicts wind conditions later than the present time, and calculates a predicted wind generation power in the second control period, based on wind prediction information in the second control period provided from the wind prediction device, and

when calculating the planned generation power value, the planned generation power value operation unit corrects the average value of the wind generated power used in the calculation, using the predicted wind generation power, and calculates the planned generation power value, based on the average value of the wind generated power after the correction.

3. The wind power generation system according to claim 2,

wherein, if the average value of the wind generated power is greater than the predictive wind generation power when correcting the average value of the wind generated power to be used for calculating the planned generation power value, the wind power generation control device corrects the average value of the wind generated power by replacing the average value of the wind generated power with the predictive wind generation power.

4. The wind power generation system according to claim 1,

wherein the wind power generation control device calculates the charge-discharge power so that,

when the wind generated power is above the upper limit value of the allowable range of the planned generation power value, the system generated power becomes equal to the upper limit value of the allowable range of the planned generation power value, and

when the wind generated power is below the lower limit value of the allowable range of the planned generation power value, the system generated power becomes equal to the lower limit value of the allowable range of the planned generation power value,

then controls the storage battery system so as to charge and discharge the calculated charge-discharge power.

5. The wind power generation system according to claim 1,

wherein the wind power generation control device outputs, when the wind generated power generated by the wind power generator group exceeds a power, obtained by adding the planned generation power value and a chargeable power of the storage battery system at that time, a command to limit a power corresponding to the amount of the exceeding power to the wind power generator group.

6. A wind power generation control method, for use by a wind power generation system comprising:

a wind power generator group composed of a plurality of wind power generators;

a storage battery system composed of a plurality of batteries; and

a wind power generation control device that performs a control so that a system generated power, obtained by adding a wind generated power generated by the wind power generator group and a charge-discharge power charged and discharged by the storage battery system, falls within an allowable range of a planned generation power value set in advance, over the charge-discharge power,

wherein the wind power generation control device comprises;

an average value operation unit that calculates an average value of the wind generated power generated by the wind power generator group during a first control period before the present time;

a targeted SOC range operation unit that calculates a targeted battery charging rate range of the storage battery system; and

a planned generation power value operation unit that calculates a planned generation power value for a second control period which is set later than the present time, based on the average value of the wind generated power calculated by the average value operation unit,

wherein the planned generation power value operation unit sets as the planned generation power value;

the average value of the wind generated power, when a current battery charging rate of the storage battery system is in the range of the upper and lower limit values of the targeted battery charging rate range;

a value obtained by multiplying a positive constant greater than 1 to the average value of the wind generated power, when the current battery charging rate of the storage battery system is above the upper limit value of the targeted battery charging rate range; and

a value obtained by multiplying a positive constant less than 1 to the average value of the wind generated power, when the current battery charging rate of the storage battery system is below the lower limit value of the targeted battery charging rate range.

7. The wind power generation control method according to claim 6,

wherein the wind power generation control device further comprises

a predicted generation power operation unit that is connected to a wind prediction device that predicts wind conditions later than the present time, and calculates a predicted wind generation power in the second control period, based on wind prediction information in the second control period provided from the wind prediction device, and

when calculating the planned generation power value, the planned generation power value operation unit corrects the average value of the wind generated power used in the calculation, using the predicted wind generation power, and calculates the planned generation power value, based on the average value of the wind generated power after the correction.

8. The wind power generation control method according to claim 7,

wherein, if the average value of the wind generated power is greater than the predictive wind generation power when correcting the average value of the wind generated power to be used for calculating the planned generation power value, the wind power generation control device corrects the average value of the wind generated power by replacing the average value of the wind generated power with the predictive wind generation power.

9. The wind power generation control method according to claim 6,

wherein the wind power generation control device calculates the charge-discharge power so that,

when the wind generated power is above the upper limit value of the allowable range of the planned generation power value, the system generated power becomes equal to the upper limit value of the allowable range of the planned generation power value, and

when the wind generated power is below the lower limit value of the allowable range of the planned generation power value, the system generated power becomes equal to the lower limit value of the allowable range of the planned generation power value,

then controls the storage battery system so as to charge and discharge the calculated charge-discharge power.

10. The wind power generation control method according to claim 6,

wherein the wind power generation control device outputs, when the wind generated power generated by the wind power generator group exceeds a power, obtained by adding the planned generation power value and a chargeable power of the storage battery system at that time, a command to limit a power corresponding to the amount of the exceeding power to the wind power generator group.

11. A wind power generation control device, connected to a wind power generator group composed of a plurality of wind power generators and a storage battery system composed of a plurality of batteries, comprising:

a charge-discharge power command operation unit that performs a calculation so that a system generated power, obtained by adding a wind generated power generated by the wind power generator group and a charge-discharge power charged and discharged by the storage battery system, falls within an allowable range of a planned generation power value set in advance, on the charge-discharge power, and outputs the calculated charge-discharge power to the storage battery system;

an average value operation unit that calculates an average value of the wind generated power generated by the wind power generator group during a first control period before the present time;

a targeted SOC range operation unit that calculates a targeted battery charging rate range of the storage battery system; and

a planned generation power value operation unit that calculates a planned generation power value for a second control period which is set later than the present time, based on the average value of the wind generated power calculated by the average value operation unit,

wherein the planned generation power value operation unit sets as the planned generation power value;

the average value of the wind generated power, when a current battery charging rate of the storage battery system is in the range of the upper and lower limit values of the targeted battery charging rate range;

a value obtained by multiplying a positive constant greater than 1 to the average value of the wind generated power, when the current battery charging rate of the storage battery system is above the upper limit value of the targeted battery charging rate range; and

a value obtained by multiplying a positive constant less than 1 to the average value of the wind generated power, when the current battery charging rate of the storage battery system is below the lower limit value of the targeted battery charging rate range.

12. The wind power generation control device according to claim 11,

wherein the wind power generation control device further comprises

a predicted generation power operation unit that is connected to a wind prediction device that predicts wind conditions later than the present time, and calculates a predicted wind generation power in the second control period, based on wind prediction information in the second control period provided from the wind prediction device, and

when calculating the planned generation power value, the planned generation power value operation unit corrects the average value of the wind generated power used in the calculation, using the predicted wind generation power, and calculates the planned generation power value, based on the average value of the wind generated power after the correction.

13. The wind power generation control device according to claim 12,

wherein, if the average value of the wind generated power is greater than the predictive wind generation power when correcting the average value of the wind generated power to be used for calculating the planned generation power value, the wind power generation control device corrects the average value of the wind generated power by replacing the average value of the wind generated power with the predictive wind generation power.

14. The wind power generation control device according to claim 11,

wherein the wind power generation control device calculates the charge-discharge power so that,

when the wind generated power is above the upper limit value of the allowable range of the planned generation power value, the system generated power becomes equal to the upper limit value of the allowable range of the planned generation power value, and

when the wind generated power is below the lower limit value of the allowable range of the planned generation power value, the system generated power becomes equal to the lower limit value of the allowable range of the planned generation power value,

then controls the storage battery system so as to charge and discharge the calculated charge-discharge power.

15. The wind power generation control device according to claim 11,

wherein the wind power generation control device outputs, when the wind generated power generated by the wind power generator group exceeds a power, obtained by adding the planned generation power value and a chargeable power of the storage battery system at that time, a command to limit a power corresponding to the amount of the exceeding power to the wind power generator group.