CONTROL SYSTEM AND METHOD FOR USING ENERGY STORAGE IN CONTRACT CAPACITY USERS

Abstract

A control method for using a battery for energy storage for contract capacity users includes, turning on a demand controller, starting output power calculation and battery power supply control, measuring a power consumption time interval set by a utility company as a cycle time, obtaining a power value that a load can use every minute, measuring and calculating an output power of a utility power output once a minute, and accumulating the output power according to time and comparing it with an accumulative usable contract capacity. When accumulative output power of the utility power output is greater than accumulative usable contract capacity and voltage of the battery is higher than a preset lower limit, start the battery to supply power to the load and when the voltage of the battery is lower than the preset lower limit, the battery will not supply power to the load.

Claims

1. A control method for using a battery for energy storage for contract capacity users comprising: turning on a demand controller; starting output power calculation and battery power supply control; measuring a power consumption time interval of a user set by a utility power company as a cycle time; dividing a contract capacity by the cycle time to get a power value that a load can use; measuring and calculating an output power of a utility power output; and accumulating the output power according to time and comparing it with an accumulative usable contract capacity to determine when the batter should supply power to the load.

2. The control method for using a battery for energy storage for contract capacity users according to claim 1, further comprising: determining if a battery voltage is lower than a preset upper limit value.

3. The control method for using a battery for energy storage for contract capacity users according to claim 2, further comprising: charging the battery if the battery voltage is lower than the preset upper limit value and a load power consumption is lower than a preset demand consumption.

4. The control method for using a battery for energy storage for contract capacity users according to claim 3, further comprising: charging the battery to the preset upper limit value.

5. The control method for using a battery for energy storage for contract capacity users according to claim 4, further comprising: ending charging when the preset upper limit value is reached.

6. The control method for using a battery for energy storage for contract capacity users according to claim 1, wherein when accumulative output power of the utility power output is greater than accumulative usable contract capacity, and voltage of the battery is higher than a preset lower limit, start the battery to supply power to the load.

7. The control method for using a battery for energy storage for contract capacity users according to claim 1, wherein, when the voltage of the battery is lower than the preset lower limit, the battery will not supply power to the load.

8. The control method for using a battery for energy storage for contract capacity users according to claim 1, wherein measuring and calculating the output power of the utility power output is performed once per minute.

9. A control method for using a battery for energy storage for contract capacity users comprising: turning on a demand controller; determining if a battery voltage is lower than a preset upper limit value; charging the battery if the battery voltage is lower than the preset upper limit value and a load power consumption is lower than a preset demand consumption; charging the battery to the preset upper limit value; ending charging when the preset upper limit value is reached; starting output power calculation and battery power supply control; measuring a power consumption time interval of a user set by a utility power company as a cycle time; dividing a contract capacity of the cycle time by the cycle time to get a power value that a load can use every minute; and measuring and calculating an output power of a utility power output; and accumulating the output power according to time and comparing it with an accumulative usable contract capacity to determine if the battery should supply power to the load.

10. The control method for using a battery for energy storage for contract capacity users according to claim 9, wherein when accumulative output power of the utility power output is greater than accumulative usable contract capacity, and voltage of the battery is higher than a preset lower limit, start the battery to supply power to the load.

11. The control method for using a battery for energy storage for contract capacity users according to claim 10, wherein, when the voltage of the battery is lower than the preset lower limit, the battery will not supply power to the load.

12. The control method for using a battery for energy storage for contract capacity users according to claim 9, wherein measuring and calculating the output power of the utility power output is performed once per minute.

13. A control method for using a battery for energy storage for contract capacity users comprising: turning on a demand controller; determining if a battery voltage is lower than a preset upper limit value; charging the battery if the battery voltage is lower than the preset upper limit value and a load power consumption is lower than a preset demand consumption; charging the battery to the preset upper limit value; ending charging when the preset upper limit value is reached; starting output power calculation and battery power supply control; measuring a power consumption time interval of a user set by a utility power company as a cycle time; dividing a contract capacity of the cycle time by the cycle time (n minutes) to get a power value that a load can use every minute; and measuring and calculating an output power of a utility power output once a minute; accumulating the output power according to time and comparing it with an accumulative usable contract capacity; wherein when accumulative output power of the utility power output is greater than accumulative usable contract capacity, and voltage of the battery is higher than a preset lower limit, start the battery to supply power to the load; and wherein, when the voltage of the battery is lower than the preset lower limit, the battery will not supply power to the load.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a schematic diagram illustrating a system architecture diagram of the technology of the present disclosure.

[0015] FIG. 2 is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0016] FIG. 3 is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0017] FIG. 4 is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0018] FIG. 5 is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0019] FIG. 6 is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0020] FIG. 7 is a drawing illustrating calculation of technical output power according to an embodiment of the present disclosure.

[0021] FIG. 8 is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0022] FIG. 9 is a graph illustrating predicting when power output will exceed the contract.

[0023] FIG. 10 is a graph illustrating predicting that the consumption will not exceed the contract.

[0024] FIG. 11 is a graph illustrating maintaining demand below limit.

[0025] FIG. 12 is a graph illustrating actual operation results.

DETAILED DESCRIPTION OF THE INVENTION

[0026] To facilitate understanding of the object, characteristics and effects of this present disclosure, embodiments together with the attached drawings for the detailed description of the present disclosure are provided.

[0027] Referring to FIG. 1, which is a schematic diagram illustrating a system architecture diagram of the technology of the present disclosure.

[0028] As shown in FIG. 1, the system architecture 100 comprises a utility power supply 110 which supplies power to a user 140. A current sensor is connected between the utility power supply 110 and the user 140. An input to an inverter 120 is connected to the current sensor. A control communication interface, for example an RS485 interface, connects a demand controller 130 to the inverter 120. The control communication interface allows the accumulated watt-hour value of the inverter to be read and control the charging and output power through the control communication interface.

[0029] A battery module 150 outputs direct current (DC) to the inverter 120 when required.

[0030] Refer to FIG. 2 is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0031] The method 200 begins in step 210 by turning on the demand controller. Next, in step 220, determine whether the battery voltage is lower than a preset upper limit value; when the battery voltage is lower than a preset upper limit value, and the load power consumption is lower than the preset demand consumption, the utility power charges the battery; upon the battery being charged to the preset value, stop charging the battery.

[0032] In step 230, start output power calculation and battery power supply control, and measure the power consumption time interval of the “contract capacity user” set by the power company as the cycle time, divide the contract capacity of the cycle time by the cycle time (n minutes) to get the power that the load can use every minute; measure and calculate the output power of a utility power output terminal once a minute; accumulate the output power according to time and compare it with the accumulative usable contract capacity; when the accumulative output power of the utility power output is greater than the accumulative usable contract capacity, and the battery voltage is higher than a preset lower limit, start the battery to supply power to the load; If the battery voltage is lower than a preset lower limit, the battery will not supply power

[0033] Refer to FIG. 3, which is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0034] The method 300 begins in step 310 by turning on the demand controller. Then, in step 320, determine whether the battery voltage is lower than a preset upper limit value; when the battery voltage is lower than a preset upper limit value, and the load power consumption is lower than the preset demand consumption, the utility power charges the battery; upon the battery being charged to the preset value, stop charging the battery.

[0035] In step 330, start output power calculation and battery power supply control, repeat the cycle once every 15 minutes, divide the contract capacity of 15 minutes by 15 to obtain the power that can be used by the load per minute; measure and calculate the output power of a utility power output terminal once a minute; accumulate the output power according to time and compare it with the accumulative usable contract capacity; when the accumulative output power of the utility power output is greater than the accumulative usable contract capacity, and the battery voltage is higher than a preset lower limit, start the battery to supply power to the load; If the battery voltage is lower than a preset lower limit, the battery will not supply power.

[0036] Refer to FIG. 4, which is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0037] As shown in FIG. 4, the method 400 begins in step 410. In step 420, determine whether or not demand control is started. If no, the method ends in step 460, if yes proceed to step 430.

[0038] In step 430 the charging control procedure is performed. Then, in step 440, the output power calculation procedure is performed. In step 450, the output control procedure is performed and the method returns to step 420 to repeat until the method 400 ends in step 460.

[0039] Refer to FIG. 5, which is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0040] As shown in FIG. 5, the method 500 starts in step 505. In step 510, determine whether or not the present voltage is less than the voltage lower limit. If yes, proceed to step 515 to set a low voltage flag to 1 and proceed to step 520. If no, proceed to step 520.

[0041] In step 520 determine whether or not the present voltage is less than the voltage upper limit minus one (−1). If yes, proceed to step 525. If no, proceed to step 540.

[0042] In step 525, determine whether or not the expected output power equals zero (0). If no, proceed to step 535. If yes, proceed to step 530.

[0043] In step 530, start charging and then proceed to step 540.

[0044] In step 535, stop charging and then proceed to step 540.

[0045] In step 540, determine whether or not the present voltage is greater than the voltage lower limit plus 2 (+2). If yes, proceed to step 545 and set a low voltage flag to zero (0) and proceed to step 550. If no, proceed to step 550.

[0046] In step 550, determine whether or not the present voltage is greater to or equal to (>=) the voltage upper limit. If yes, proceed to step 555 to stop charging and proceed to step 560 to end the method 500. If no, proceed to step 560 to end the method 500.

[0047] Refer to FIG. 6, which is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure.

[0048] As shown in FIG. 6, the method 600 starts in step 610. In step 620, determine whether or not a counter has counted for one minute. If yes, proceed to step 630. If no, proceed to step 690 to end the method 600.

[0049] In step 630, calculate the usable capacity for every minute wherein the usable capacity for the first X minutes equals the contract capacity multiplied by one hour divided by 60 multiplied by X (first X minutes=contract capacity×1 h/60×X).

[0050] In step 640, calculate the power used for the first X minutes.

[0051] In step 650, determine whether or not the power used for the first X minutes is greater than the usable capacity for the first X minutes. If yes, proceed to step 670 and set expected output power for the first X minutes equal to the power used for the first X minutes minus the usable capacity for the first X minutes and proceed to step 680.

[0052] If no, proceed to step 680.

[0053] In step 680, set the expected output power equal to the maximum expected output power for the first X minutes times 60 divided by 1 hour and proceed to step 690 to end the method 600.

[0054] Refer to FIG. 7, which is a drawing illustrating calculation of technical output power according to an embodiment of the present disclosure, to FIG. 8, which is a flow chart illustrating a method for applying energy storage to contract capacity to prevent users from exceeding their contracts according to an embodiment of the present disclosure, to FIG. 9, which is a graph illustrating predicting when power output will exceed the contract, to FIG. 10, which is a graph illustrating predicting that the consumption will not exceed the contract, to FIG. 11, which is a graph illustrating maintaining demand below limit, and to FIG. 12, which is a graph illustrating actual operation results.

[0055] In an embodiment of the present disclosure, the method uses a cycle every 15 minutes to divide the contract capacity of 15 minutes by 15 to obtain the amount of electricity that can be used by the load per minute. The output power of the mains output terminal is measured and calculated once every minute, according to time and the cumulative output power is compared with the cumulative available contract capacity. When the cumulative output power of the mains output is greater than the cumulative available contract capacity and the battery voltage is higher than a preset lower limit, the battery will be activated to supply power to the load. When the voltage is lower than a preset lower limit, the battery does not supply power.

[0056] When the system starts, a prediction is made to determine if the power output will exceed the contract. After the power is output, it is determined that the consumption will exceed the contract and the power output is reduced and the demanded power is maintained below the limit.

[0057] While the present disclosure has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the present disclosure set forth in the claims.