JP6364863B2 - Operation method of storage battery - Google Patents

Description

  The present invention relates to a method for operating a storage battery capable of storing and outputting electric power.

  In recent years, a storage battery such as a sodium-sulfur battery (NAS battery) capable of storing (charging) a large amount of electric power has been widely used. As a result, electricity is stored in the time zone such as midnight when electricity charges are low, and the stored electricity is output (discharged) to the facility during the day, so that the power cost can be reduced on the consumer side. It becomes possible for the operator to level the load.

  As a method for operating a sodium ion-sulfur battery, which is a type of storage battery, for example, in Patent Document 1, a discharge-charge cycle is repeated in which the amount of electricity required to discharge a specified discharge power amount in the daytime is charged and charged at night. The predetermined number of days and the predetermined number of days to be put into a dormant state without performing a discharge-charge cycle are set as one unit. And within this unit, every time the discharge-charge cycle is repeated, the time average temperature at the time of discharge of the module battery is made higher than the time average temperature at the time of discharge of the previous discharge-charge cycle, and The temperature of the module battery when starting the next discharge from the rest state for a predetermined number of days is approximated to the temperature at the start of the discharge on the first day in the previous unit. According to Patent Document 1, it is possible to prevent the battery from being insufficiently charged and to appropriately respond to power demand by the above configuration.

JP 2000-1113910 A

  The operation method disclosed in Patent Document 1 is a NAS battery operation method in which a plurality of predetermined days is defined as one unit, specifically, a week unit. On the other hand, as described above, the operation method of the storage battery on a daily basis includes peak shift operation that outputs electric power according to a predetermined operation pattern in which the electric power stored at night is discharged during the day, or peak over operation. A load following operation that outputs electric power so as to avoid this is known.

  However, at present, when peak shift operation and load following operation are used in combination, if the time period during which peak over occurs is earlier than the peak time in peak shift operation, peak shift operation at peak time is performed by load following operation. In some cases, the power required for the operation may be insufficient. Moreover, when the time zone in which the peak over occurs is later than the peak time in the peak shift operation, the power required for the load following operation may be insufficient due to the peak shift operation.

  In view of such a problem, an object of the present invention is to provide a storage battery operating method capable of suitably using a peak shift operation and a load following operation without causing power shortage.

  In order to solve the above problems, a typical configuration of a storage battery operation method according to the present invention includes a peak shift operation that outputs power according to a predetermined operation pattern, and a load that outputs power so as to avoid peak over. A storage battery operation method for performing follow-up operation, wherein an operation pattern corresponding to a storage amount after storage is selected from operation patterns of peak shift operation registered in advance, and the selected operation pattern and the demand forecast for the day If it is predicted that a peak overtime will occur in the time zone earlier than the peak time in the selected driving pattern, only load following operation should be performed in the time zone before the peak time. It is characterized by.

  According to the above configuration, even when a peak over occurs in a time zone earlier than the peak time, the power required for the load following operation can be ensured by not performing the peak shift operation in that time zone. Therefore, it is possible to suitably use the peak shift operation and the load following operation without causing a shortage of electric power necessary for the peak shift operation at the peak time due to the load following operation.

  In order to solve the above problems, another configuration of the storage battery operation method according to the present invention includes a peak shift operation that outputs electric power according to a predetermined operation pattern, and a load tracking that outputs electric power so as to avoid peak over. An operation method of a storage battery that performs operation, and selects an operation pattern according to a storage amount after storage from among operation patterns of peak shift operation registered in advance, and selects the selected operation pattern and demand forecast for the day. In comparison, if it is predicted that a peak overtime will occur in a time zone later than the peak time in the selected driving pattern, the time zone before the peak time is multiplied by a ratio of less than 1 to the output in the selected driving pattern. It is characterized by operating with a capacity reduction pattern that outputs a large amount of power.

  According to such a configuration, even when a peak over occurs in a time zone later than the peak time, it is possible to secure the power required for the load following operation by operating with the capacity reduction pattern. At this time, since the peak shift operation at the peak time is performed as usual, the peak shift operation is not affected. Therefore, it is possible to suitably use the peak shift operation and the load following operation without causing shortage of power necessary for the load following operation at the time of peak over due to the peak shift operation.

  During the time period after the peak time, the selected operation is performed so that the available amount obtained by subtracting the amount of charge for nighttime charging shortage and the amount of energy for avoiding peak overtime after the peak time from the remaining power is used up before the start of charging. It is preferable to output power obtained by multiplying the output in the pattern by a predetermined ratio. Thereby, it becomes possible to output efficiently the electric power stored in the storage battery. In addition, by subtracting the nighttime charging shortage from the remaining power amount in advance, it is possible to avoid insufficient charging at the time of charging after the operation is completed, and the storage battery after charging is in a state close to full charge. Therefore, it is possible to use the maximum capacity of the storage battery during the next operation after charging.

  ADVANTAGE OF THE INVENTION According to this invention, the driving | running method of the storage battery which can use peak shift driving | operation and load follow-up driving | operation suitably suitably without causing power shortage can be provided.

It is a flowchart explaining the operating method of the storage battery concerning this embodiment. It is a figure which illustrates the relationship between the output amount of a storage battery, and the electric power consumption in the installation used as output object.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a flowchart illustrating a method for operating a storage battery according to the present embodiment. FIG. 2 is a diagram illustrating the relationship between the output amount of the storage battery and the power consumption in the facility to be output. Here, as will be described later, the storage battery operated by the operation method according to the present embodiment includes a peak shift operation that outputs electric power according to a predetermined operation pattern, and a load tracking that outputs electric power so as to avoid peak over. It is possible to perform both driving. In addition, in this embodiment, in order to understand easily, the structure which controls the driving | operation of a storage battery by a control apparatus (not shown) is illustrated and demonstrated, However, This control apparatus may be incorporated in the storage battery. However, it can be installed separately from the storage battery.

  As shown in FIG. 1, in the storage battery operation method of the present embodiment, first, the control device calculates the storage amount after storage of the storage battery from the operation pattern of peak shift operation registered in advance in a storage unit such as an EEPROM. A corresponding operation pattern is selected (step S202). Then, the control device compares the operation pattern of peak shift operation of the selected storage battery (hereinafter referred to as the selected operation pattern) with the demand forecast for the day (step S204). The demand prediction can be calculated by referring to information such as the temperature and weather of the day, the operation schedule of the facility, and the like.

  When the selected operation pattern is compared with the demand forecast for the day, the control device determines whether or not the occurrence of peak over is predicted in the time zone before and after the peak time in the operation pattern (step S206). When the occurrence of peak over is not predicted in the time zone before and after the peak time (NO in step S206), the control device determines the operation pattern of the storage battery to be the operation pattern selected in step S202 (step S208). Operation is started (step S210).

  FIG. 2A illustrates the operation pattern of the storage battery selected from the operation patterns of the peak shift operation registered in advance in step S202. If it is predicted in step S206 that no peak over occurs before or after the peak time in the selected operation pattern, the storage battery operates in the operation pattern shown in FIG.

  Specifically, in FIG. 2A, the time zone in which the power consumption in the facility to which the storage battery supplies power exceeds the contracted capacity of the facility, that is, the peak time is around 12:00. For this reason, in the selected operation pattern, the operation pattern is determined so as to increase the output amount from the storage battery around 12:00. Thereby, it becomes possible to perform a so-called peak shift that prevents the contract capacity from exceeding the peak time around 12:00 by the output from the storage battery.

  On the other hand, when the occurrence of peak over is predicted in the time zone before and after the peak time (YES in step S206), the control device determines that the predicted occurrence of peak over is based on the peak time of the operation pattern selected in step S202. It is determined whether or not it is an early time zone (step S212). If it is determined that the predicted occurrence of peak over is in a time zone earlier than the peak time in the selected operation pattern (YES in step S212), the control device performs peak shift operation in the time zone before the peak time. First, the storage battery is controlled so as to perform only the load following operation (peak over avoidance) (step S214).

  FIG. 2B is a diagram illustrating a conventional operation pattern of the storage battery at the time of combined use of peak shift operation and load following operation. As shown in FIG. 2 (b), conventionally, when a sudden peak over occurs in a time zone before the peak time, the output of the storage battery is increased so as to follow the load. However, with such a conventional operation method, power is consumed by load following operation during peak over in a time zone earlier than the peak time, and there is not enough power necessary for peak shift operation at peak time. May end up.

  FIG.2 (c) is a figure which illustrates the driving | operation pattern in the driving | running method of this embodiment of the storage battery at the time of combined use of peak shift driving | operation and load follow-up driving | operation. In the operation method of the storage battery of the present embodiment, as shown in FIG. 2C, if it is predicted that a peak over will occur in a time zone earlier than the peak time of the selected operation pattern, the time zone before the peak time is a peak shift. Only load following operation is performed without operation.

  In other words, the control device controls the storage battery so that power is not output during the time period before the peak time except during peak over, and power is output only during peak over. Thereby, the electric power required for the peak shift operation at the peak time can be secured while avoiding the sudden peak over in the time zone earlier than the peak time. Therefore, peak shift operation and load following operation can be suitably used in combination.

  On the other hand, if it is determined that the predicted occurrence of peak over is not in a time zone earlier than the peak time in the selected operation pattern (i.e., a late time zone) (NO in step S212), the control device starts from the start of operation. The predicted remaining power amount after the peak time is calculated by subtracting the amount of power predicted to be output before the peak time from the stored power amount (power amount) before the start of operation (after power storage) (step S216).

  Subsequently, the control device refers to the predicted remaining power amount and determines whether or not a peak over predicted to occur in a time zone later than the peak time in the selected operation pattern can be avoided (step S218). When the peak over can be avoided (YES in step S218), the control device determines the operation pattern of the storage battery as the operation pattern selected in step S202 (step S208), and starts the operation of the storage battery (step S210). .

  If it is determined that a peak over predicted to occur in a time zone later than the peak time cannot be avoided by the predicted remaining power amount (NO in step S218), the control device changes the operation pattern of the storage battery to the time zone before the peak time. Is determined to be a capacity reduction pattern that outputs power obtained by multiplying the output in the selected operation pattern by a ratio of less than 1 (a ratio that does not peak over before the peak time) (step S220). And a control apparatus starts the driving | operation of a storage battery by a capacity | capacitance reduction pattern (step S210).

  FIG. 2D is a diagram illustrating an operation in a capacity reduction pattern of the storage battery. As shown in FIG. 2 (d), the storage battery operates at an output smaller than the operation pattern (shown by a broken line) in the time zone before the peak time in the selected operation pattern. Thereby, even if it is a case where a peak over occurs in a time slot later than the peak time, it is possible to secure the power required for the load following operation. Therefore, it is possible to suitably use the peak shift operation and the load following operation without causing a shortage of electric power necessary for the load following operation at the time of peak over.

  In the present embodiment, by referring to the predicted remaining power amount calculated in step S216, it is determined in step S218 whether or not a peak over predicted to occur in a time zone later than the peak time can be avoided. Such a configuration is merely an example, and the present invention is not limited to this. For example, if step S216 and step S218 are not provided, and it is predicted in step S212 that a peak over occurs in a time zone later than the peak time, the operation may be performed with a capacity reduction pattern.

  After starting the operation of the storage battery, the control device monitors whether or not the peak time has elapsed (step S222). When the peak time has elapsed (YES in step S222), the control device subtracts the amount of charging at night and the amount of power for avoiding peak over after the peak time from the remaining power amount after the peak time has elapsed. Thus, the usable amount is calculated (step S224).

  The amount of remaining power after the peak time has elapsed is the amount of power output in the time zone before the peak time, the amount of power consumed in the peak time, and the time zone after the peak time. This is a value obtained by subtracting the amount of power output to. In this calculation, the amount of power output in a time zone after the peak time is substantially zero immediately after the peak time has elapsed.

  Once the usable amount is calculated, the control device outputs electric power multiplied by a predetermined ratio to the output in the selected operation pattern so that the usable amount is used up before the start of charging in the time zone after the peak time. The storage battery is operated so as to do this (step S226). The ratio applied here may be less than 1 or 1 or more. This makes it possible to use the power stored in the storage battery most efficiently. In addition, by subtracting the nighttime charge shortage from the remaining power amount in advance, it is possible to avoid a shortage of charge at the time of charging after the end of operation. Therefore, the storage battery after charging can be brought into a state close to full charge, and the maximum capacity of the storage battery can be used at the start of the next operation after charging.

  Until the operation end time is reached (NO in step S228), the control device calculates a usable amount in step S224 every time a predetermined time has elapsed (YES in step S230), and refers to the usable amount. The storage battery is operated while updating the predetermined ratio (step S226). When the operation end time is reached (YES in step S228), the control device stops the operation of the storage battery and starts charging.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used as an operation method of a storage battery capable of storing and outputting electric power.

Claims (3)

A storage battery operation method for performing peak shift operation for outputting electric power according to a predetermined operation pattern and load following operation for outputting electric power so as to avoid peak over,
Select an operation pattern according to the amount of electricity after electricity storage from among the operation patterns of the peak shift operation registered in advance,
Compare the selected driving pattern with the demand forecast for the day,
When it is predicted that the peak over occurs in a time zone earlier than the peak time in the selected operation pattern, the peak shift operation is not performed and only the load following operation is performed in the time zone before the peak time. An operation method of a storage battery characterized by the above. A storage battery operation method for performing peak shift operation for outputting electric power according to a predetermined operation pattern and load following operation for outputting electric power so as to avoid peak over,
Select an operation pattern according to the amount of electricity after electricity storage from among the operation patterns of the peak shift operation registered in advance,
Compare the selected driving pattern with the demand forecast for the day,
When it is predicted that the peak over occurs in a time zone later than the peak time in the selected driving pattern, the time zone before the peak time has a ratio of less than 1 to the output in the selected driving pattern. An operation method of a storage battery, wherein the operation is performed with a capacity reduction pattern that outputs applied electric power.   In the time period after the peak time, the selection is performed so that the available amount obtained by subtracting the amount of charge for nighttime charge shortage and the amount of energy for avoiding the peak overtime after the peak time from the remaining power amount is used up before the start of charging. The method of operating a storage battery according to claim 1 or 2, wherein electric power obtained by multiplying a predetermined ratio with respect to an output in the operation pattern is output.

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