JP2014217198A - Power storage amount management device and power storage amount management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress rise in the maximum value of power consumption and in the maximum value of interconnection point power flow by appropriately managing a power storage amount.SOLUTION: A power storage amount management device 11 manages a power storage amount of a power storage device 8 in a power distribution system 2 configured so that natural energy power generation devices 5-1 and 5-2, power loads 6-1 to 6-3, a distribute type power supply 7, and the power storage device 8 are connected with a high-order system 1 via a distribution line 4. The power storage amount management device 11 comprises: demand prediction means 13 for predicting a total sum of power consumption of the power loads 6-1 to 6-3; natural energy power generation prediction means 14 for predicting a total sum of effective power output of the natural energy power generation devices 5-1 and 5-2; and planning means 15 for producing a power flow prediction result from the demand prediction result of the demand prediction means 13 and the output prediction result of the natural energy power generation prediction means 14, and generating a charging planned value Pfor correcting a charging amount of the power storage device 8 in a time zone where a value of the power flow prediction result is smaller than a reference value.

Description

  Embodiments described herein relate generally to a storage amount management device and a storage amount management system that manage a storage amount of a storage device connected to a grid.

  When using a power storage device to suppress fluctuations in the grid power flow and suppressing output fluctuations of a natural energy power generation device, the power storage amount or an index indicating the power storage amount is constantly monitored, and the power storage amount is increased or decreased. There is a storage amount management method for correcting the output of the storage device.

JP 2011-234563 A

  However, in the conventional power storage amount management method as described above, the output is adjusted in a direction in which charging increases or discharge decreases regardless of the time zone when the power storage amount decreases. In the system configuration in which the maximum value of power is increased and the system is connected to the upper system, there is a problem that the maximum value of the interconnection point power flow increases unexpectedly.

  Embodiments of the present invention provide a storage amount management device and a storage amount management system that can suppress an increase in the maximum value of power consumption and the maximum value of interconnection point power flow by appropriately managing the storage amount. Objective.

In order to achieve the above object, an embodiment of the present invention manages the amount of electricity stored in the power storage device in a distribution system in which a natural energy power generation device, a power load, and a power storage device are connected to a higher-order system via a distribution line. A power storage amount management device that predicts a sum of power consumption of the power load, a natural energy power generation prediction device that predicts a sum of active power output of the natural energy power generation device, and the demand prediction device. A power flow prediction result is generated from the demand prediction result of the natural energy generation and the output prediction result of the natural energy power generation prediction means, and the charge amount of the power storage device is corrected in a time zone in which the value of the power flow prediction result is smaller than a reference value and planning means for generating a charging plan value P _BS, characterized in that it comprises a.

In addition, the embodiment of the present invention includes a distribution system in which a natural energy power generation device, a power load, a distributed power source, and a power storage device are connected to a host system via a distribution line, and a power storage amount management device that is connected to the power distribution system An active power detection means for outputting a total demand P _dem from a sum of active power outputs of the natural energy power generation device and a sum of power consumption of the power load, and a power consumption of the power load Demand prediction means for predicting the sum of the natural energy, natural energy power generation prediction means for predicting the sum of the active power output of the natural energy power generation device, demand prediction results of the demand prediction means, and output prediction results of the natural energy power generation prediction means For generating a power flow prediction result, and correcting the amount of charge of the power storage device in a time zone in which the value of the power flow prediction result is smaller than a reference value A plan unit for generating a charging plan value _PBS and generating a power flow target value _PTG with the upper system, and when the amount of power stored in the power storage device is greater than or equal to a first specified value, the charging plan value PBS _{When BS} is selected, and the amount of electricity stored in the power storage device is less than the first specified value, the emergency charge setting value that is set in advance until the amount of electricity stored exceeds a second specified value that is greater than the first specified value selection means for selecting a P _BB, wherein a subtractor for outputting an adjustment amount P _E by subtracting the electric power flow target values P _TG from the total demand P _dem, enter the adjustment amount P _E long period fluctuation a low-pass filter to be applied to the distributed power supply as an output decrease command value, and comprising: a high pass filter, a given to the electric storage device short-period fluctuation component by inputting the adjustment amount P _E as the output increases or decreases the command value To do.

The block diagram which shows the structure of the electrical storage amount management system which concerns on the 1st Embodiment of this invention. It is a graph which shows the time-dependent characteristic of the input-output signal of the main means in 1st Embodiment, (a) is total load, (b) is a natural energy power generation total output, (c) is total demand P _dem , (d ) Is a power flow target value P _TG , (e) is an adjustment amount P _E , (f) is a low-pass filter output, and (g) is a high-pass filter output. Is a graph showing a procedure for calculating the charging plan value P _BS in the first embodiment, (a) shows the demand forecast results, (b) is a natural energy power generation prediction result, (c) the power flow prediction result, (d ) indicates the charging plan value _{P BS.} The flowchart which shows the process sequence of the selection means for the electrical storage amount adjustment in 1st Embodiment. The block diagram which shows the structure of the electrical storage amount management system which concerns on the 2nd Embodiment of this invention.

Embodiments of the present invention will be specifically described below with reference to the drawings.
[First Embodiment]
(Overall system configuration)
FIG. 1 is a block diagram showing a configuration of a storage amount management system according to the first embodiment of the present invention.

  The storage amount management system 10 according to the present embodiment is roughly divided into a power distribution system 2 connected to the upper system 1 and a power storage amount management device 11 connected to the power distribution system 2.

(Distribution system 2)
In the distribution system 2, the distribution line 4 is connected to the host system 1, and the distribution line 4 includes a plurality of distribution lines 4-1 to 4-4 provided in series. In the distribution line 4, a distributed power source 7 and a power storage device 8 are connected between the distribution line 4-1 and the distribution line 4-2, and power is distributed between the distribution line 4-2 and the distribution line 4-3. The load 6-1 and the natural energy power generation device 5-1 are connected, and the power load 6-2 and the natural energy power generation device 5-2 are connected between the distribution line 4-3 and the distribution line 4-4. The power load 6-3 is connected to 4-4. Further, between the distribution line 4-1 and the distribution line 4-2, an active power detector that measures the total effective power of the natural energy power generation devices 5-1 to 5-2 and the power loads 6-1 to 6-3. 9-1 is arranged. The active power detector 9-1 is connected to the storage amount management device 11 and has a function of outputting the total demand P _dem to the subtractor 12-1 described later.

(Storage amount management device 11)
The storage amount management device 11 includes a demand prediction unit 13 that performs demand prediction, a natural energy power generation prediction unit 14, a plan unit 15 provided on the output side of these units, and a selection provided on the output side of the plan unit 15 Means 16, subtractor 12-1, low pass filter (LPF) 17 and high pass filter (HPF) 18 provided on the output side of subtractor 12-1, adder 19 provided on the output side of these filters, and And a subtractor 12-2.

The planning means 15 inputs the output of the demand prediction means 13, the output of the natural energy power generation prediction means 14, and the storage amount C from the power storage device 8 of the distribution system 2, and the power flow target value P _TG and the charging planned value P _BS. It is a means to create. The selection means 16, a power storage amount C from the power storage device 8, which is the output of the planner 15 inputs the charge planned value P _BS or emergency charging setting value P _BB, by a means for creating a correction value [Delta] P _C is there.

Subtractor 12-1 receives the aggregate demand _{P dem,} which is the output of the active power detector 9-1 is the output and power flow target values _{P TG} distribution system 2 of the planner 15, the low-pass adjustment amount _{P E} A means for outputting to the filter 17 and the high-pass filter 18. Low pass filter 17 is a means for providing the distributed power source 7 to enter long-period fluctuation of a is adjustment amount P _E output from the subtracter 12-1 as the output increases or decreases the command value. On the other hand, the high-pass filter 18 is a means for applying the electric storage device 8 a short period variation to input a is adjustment amount P _E output from the subtracter 12-1 as the output increases or decreases the command value.

The adder 19 is a means for outputting adding outputs of which is the output of the selecting means 16 the correction value [Delta] P _C and the low-pass filter 17, an output decrease command value [Delta] P _G to a distributed power supply 7. Subtractor 12-2 subtracts the correction value [Delta] P _C which is the output of the selection means 16 from the output of the high pass filter 18, a means for outputting an output decrease command value [Delta] P _B in the power storage device 8.

(Function)
The basic operation of the storage amount management device 11 having the above configuration will be described with reference to FIGS. Here, FIG. 2 is a graph showing the characteristics of the input / output signals of the main means in the present embodiment, wherein (a) is the total load, (b) is the total renewable energy power output, and (c) is the total demand. P _dem , (d) shows the power flow target value P _TG , (e) shows the adjustment amount P _E , (f) shows the low-pass filter output, and (g) shows the high-pass filter output.

First, the active power detector 9-1 of the power distribution system 2 uses the total load (FIG. 2A) in the power loads 6-1 to 6-3 to generate natural energy in the natural energy generators 5-1 to 5-2. The active power corresponding to the value obtained by subtracting the total output (FIG. 2B) is measured and output as the total demand P _dem (FIG. 2C). Next, the subtractor 12-1 of the storage amount management device 11 includes the total demand P _dem (FIG. 2C) that is the active power composite value and the power flow target value P _TG that is the output of the planning unit 15 (FIG. 2 (d)) and the adjustment amount P _E (FIG. 2 (e)) obtained by subtracting the power flow target value P _TG from the total demand P _dem is output. The adjustment amount P _E (FIG. 2 (e)) is an adjustment amount of the active power necessary for setting the power flow from the upper system 1 to the distribution system 2 as _PTG .

Moreover, while providing the dispersed power source 7 as an output decrease command value long-period variation obtained by inputting the adjustment amount P _E (FIG. 2 (f)) to the low-pass filter 17, the adjustment amount P _E in the high-pass filter 18 The short cycle fluctuation (FIG. 2 (g)) obtained by input is given to the power storage device 8 as an output increase / decrease command value. Thus, a long-period variation of the adjustment amount P _E is distributed power sources 7, acts to short-period fluctuation component as the power storage device 8 is canceled out, from the upper system 1 flowing through the distribution line 4-1 to the power distribution system 2 The power flow is controlled to the target value _PTG .

(Storage amount management method)
Next, the storage amount management method in the present embodiment will be described with reference to FIGS. Here, FIG. 3 is a graph showing a procedure for calculating the charging plan value P _BS in the present embodiment, (a) shows the demand forecast results, (b) is a natural energy power generation prediction result, (c) the power flow prediction result, (d) shows the charging plan value _{P BS.}

  First, the planning means 15 subtracts the natural energy power generation prediction result (FIG. 3B) from the natural energy power generation prediction means 14 from the demand prediction result from the demand prediction means 13 (FIG. 3A). The tidal current prediction result (FIG. 3C) is output.

Next, planning means 15, power flow prediction results based on (FIG. 3 (c)), to generate a charging plan value P _BS which is a non-zero value at certain times. Specifically, in the case where the decrease in the storage amount obtained by subtracting the storage amount C at 24:00 the previous day from the storage amount C of the storage device 8 at 24:00 the day before is positive, the power charge prediction result is charged to charge that amount. A correction time is selected from a time zone in which (FIG. 3 (c)) is smaller than a reference value (for example, an average value), and a value obtained by dividing the decrease in the charged amount by the correction time is a charging plan value P. _BS .

In FIG.3 (d), the correction | amendment time is 10:00 to 14:00 in the time slot | zone when the electric power flow prediction result (FIG.3 (c)) becomes the smallest from the average value. In this way, the output of the power storage device 8 is corrected in the direction in which the charge amount increases or the discharge amount decreases in the time zone in which the power flow prediction is the smallest, so the influence of the power flow increase is small. On the other hand, when the amount of decrease in the charged amount is negative, the power flow prediction is selected from a time zone larger than the average value and set as a correction time, and a negative charge plan value _PBS is generated. Alternatively, the power storage quantity of the power storage device 8 to compensate for the short-period fluctuation component is for easily reduced, there is a method decrease of the charged amount is to be charged planned value P _BS of 0 if negative at all hours. Incidentally, the rising and falling of the charging plan value P _BS, it is preferable that the rate of change can follow the distributed power sources 7 and the electrical power storage device 8.

Also, if the purpose of the distributed power source 7 is performed by another power storage device, the power flow target value P _TG is set by the planning unit 15 so that the stored power amount of the distributed power source 7 at 24 o'clock is set as a specified value. In the case of generation, power flow prediction obtained by adding the planned charging value to the result obtained by subtracting the natural energy power generation prediction result (FIG. 3B) from the demand prediction result (FIG. 3A) is used. Thereby, since the amount of charge of the power storage device can be added to the power flow target value _PTG , the deviation of the amount of power stored in the distributed power source 7 can be reduced.

(Processing procedure of the selection means 16 for adjusting the storage amount)
In FIG. 4, the process sequence of the selection means 16 for the electrical storage amount adjustment in this embodiment is shown.

The selection unit 16 selectively outputs one of the two input values _PBS and _PBB described above according to the amount of power stored in the power storage device 8 (see FIG. 1).
First, the selection unit 16 determines whether or not the charged amount is less than the specified value α (first specified value) (step S11), and if the charged amount is less than the specified value α (Yes in step S11). The flag is set to 1. If the charged amount is equal to or greater than the specified value α, the selecting unit 16 further determines whether or not the charged amount exceeds a specified value β (second specified value) (where α <β) (step S12). ). If the amount of stored electricity exceeds the specified value β (Yes in step S12), the flag is set to 0.

Next, it is determined flag (step S13), and selecting means 16 if 0 outputs the charging plan value _{P BS} as the correction value [Delta] P _C (step S14), and the selecting means 16 if 1, an emergency charging and it outputs the set value _{P BB} as the correction value [Delta] P _C (step S15). Assume that the flag is set to 0 as an initial value and the previous value is held. As an example, the designated value α can be a value of 20 to 30% of the rated output of the power storage device 8, and the designated value β can be a value of 60 to 70% of the rated output.

That is, in the normal power storage amount is not also is less than the specified value α once, the flag is the correction value [Delta] P _C becomes charged planned P _BS is the output of the selection means 16 in 0, the low-pass filter 17 in the adder 19 output correction value [Delta] P _C is applied to the distributed power supply 7 as an output decrease command value [Delta] P _G are added. The correction value [Delta] P _C from the output of the high pass filter 18 is supplied to the power storage unit 8 as the output increases or decreases the command value [Delta] P _B is subtracted by the subtractor 12-2. Thus, at certain times according to the value of the charging plan value P _BS (e.g., FIG. 3 (time zone 14:00 from 10:00 in d)) along with the output of the distributed power supply 7 is increased, the power storage device 8 The amount of charge increases or the amount of discharge decreases. For this reason, the power storage amount of the power storage device 8 increases or the decrease in the power storage amount is suppressed.

On the other hand, in an emergency when the storage amount is less than the specified value α (Yes in step S11), the flag is 1, so that the selection unit 16 selects the forced charge mode and sets the emergency charge set value set in advance. P _BB is the output of the selection means 16 and the correction value [Delta] P _C (step S15). Then, the forced charging mode is continued until the charged amount recovers to the specified value β. For this reason, while the output of the distributed power supply 7 increases, the charge amount of the electrical storage device 8 increases or the discharge amount decreases. Therefore, even before the pre-planned charging planned value _PBS becomes non-zero, if the charged amount is less than the specified value α, the charged amount of the power storage device 8 increases. The emergency charging set value _PBB is a fixed value such as 50% of the rated output of the power storage device 8, for example.

(effect)
According to the present embodiment, one of the two input values of the planned charging value _PBS and the emergency charging set value _PBB is selected and output by the selection means 16 according to the amount of power stored in the power storage device 8. _{When BS} is selected, as shown in FIG. 3 (d), the amount of charge of the power storage device 8 is increased or the amount of discharge is decreased in a time zone where the power flow is small, so that without increasing the peak of the power flow, A significant increase or decrease in the amount of stored electricity can be suppressed.

Further, in case where the remarkably decreased storage amount due to an error such as projections and assumptions, because reduces the increase or discharging amount charged amount of the power storage device 8 by the forced charging mode using the emergency charging setpoint P _BB, power flow Although the maximum value is not taken into consideration, the amount of stored electricity can be recovered quickly.

[Second Embodiment]
(Constitution)
FIG. 5 shows a configuration of a power storage amount management system according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

In the storage amount management system 20 of the present embodiment, the active power detector 9-1 is connected between the upper system 1 and the distribution line 4-1, while the distribution line 4-3 and the distribution line 4-4 are connected. Is connected to the distributed power source 7 and the power storage device 8 via the active power detector 9-2, and the adder receives the output of the active power detector 9-1 and the output of the active power detector 9-2 as inputs. The output of 19-2 is input to the subtractor 12-1 as the total demand P _dem , and the natural energy power generation device 5-1 and the power load 6-1 are connected between the distribution line 4-1 and the distribution line 4-2. Except for the connection, the configuration is the same as that of the storage amount management system 10 of the first embodiment.

(Function)
In the power storage amount management system 10 of the first embodiment, the total demand P _dem that is the total active power value of the natural energy power generation devices 5-1 to 5-2 and the power loads 6-1 to 6-3 is obtained as an active power detector. It was the structure measured by 9-1. On the other hand, in the storage amount management system 20 of this embodiment, since the installation positions of the distributed power source 7 and the storage device 8 are different, it is possible to measure the target total demand P _dem with the active power detector 9-1. Can not. In the present embodiment, the effective power detector 9-1 measurements P _C and distributed a total output value of the power supply 7 and the power storage device 8 of the active power detector 9-2 measured values P _D and the total demand P _dem The relationship is expressed by equation (1). Therefore, the total demand P _dem necessary for the storage amount management device 11 is obtained by the equation (2). In the present embodiment, since the adder 19-2 executes the expression (2), even when the installation positions of the distributed power source 7 and the power storage device 8 are changed, the same operation as in the first embodiment can be obtained. .

P _C = P _dem −P _D (1)
P _dem = P _C + P _D (2)

(effect)
According to the present embodiment, as in the first embodiment, an increase in the maximum value of power consumption and the maximum value of interconnection point power flow can be suppressed.

[Other embodiments]
(1) In the first and second embodiments, the distributed power source 7 and the power storage device 8 are provided in pairs, but they can be separated and provided at different positions. Further, the number of the distributed power source 7 and the power storage device 8 is not limited and may be plural.

(2) In the first embodiment, the time period (from 10:00 to 14:00) in which the power flow prediction result (FIG. 3C) is the smallest than the average value is set as the correction time (FIG. 3D). ), The correction time determination method is a time zone (0 to 6 o'clock, 9 o'clock to 16 o'clock) when the power flow prediction result (FIG. 3C) is lower than the average value, or power flow prediction It is also possible to set the time zone (from 9 o'clock to 16 o'clock) when the result (Fig. 3 (c)) is lower than the average value and the natural energy power generation prediction result (Fig. 3 (b)) is positive.

(3) In the first and second embodiments, the long-cycle fluctuation is given to the distributed power source 7 by the low-pass filter 17, and the short-cycle fluctuation is given to the power storage device 8 by the high-pass filter 18. Can be omitted, and the long-period fluctuation by the low-pass filter 17 can be given to the power storage device 8.

(4) Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Upper system 2 ... Distribution system 4, 4-1 to 4-3 ... Distribution line 5-1, 5-2 ... Natural energy power generation device 6-1 to 6-3 ... Electric power load 7 ... Distributed power supply 8 ... Electric storage Apparatus 9-1, 9-2 ... Active power detector 11 ... Storage amount management apparatus 12-1, 12-2 ... Subtractor 13 ... Demand prediction means 14 ... Natural energy power generation prediction means 15 ... Planning means 16 ... Selection means 17 ... Low-pass filter (LPF)
18 ... High-pass filter (HPF)
19, 19-2 ... adder

Claims (5)

A storage amount management device for managing a storage amount of the power storage device in a power distribution system in which a natural energy power generation device, a power load, and a power storage device are connected to a host system via a distribution line,
Demand prediction means for predicting the total power consumption of the power load;
Natural energy power generation prediction means for predicting the sum of the effective power output of the natural energy power generation device;
A power flow prediction result is created from the demand prediction result of the demand prediction unit and the output prediction result of the natural energy power generation prediction unit, and the amount of charge of the power storage device in a time zone in which the value of the power flow prediction result is smaller than a reference value and planning means for generating a charging plan value P _BS for correcting,
An electricity storage amount management device comprising: When the power storage amount of the power storage device is greater than or equal to a first specified value, the planned charging value _PBS is selected, and when the power storage amount of the power storage device is less than the first specified value, the power storage amount is the first specified value. The power storage amount management device according to claim 1, further comprising a selection unit that selects an emergency charging set value _PBB that is set in advance until a second specified value that is larger than the specified value exceeds the specified value. The planning means generates a control target value P _TG power flow between the upper line from the output prediction result of demand forecast results and the natural energy power generation prediction means of the forecast unit, further,
The power flow target value _PTG , which is the output of the planning means, and the total demand _Pdem , which is a value obtained by subtracting the total natural power generation output in the natural energy power generation device from the total load in the power load, a subtractor for outputting an adjustment amount _{P E} from the total demand _{P dem} by subtracting the electric power flow target values _{P TG,}
The adjustment amount storage amount management apparatus according to claim 1 or 2 wherein, characterized in that it comprises a low-pass and high-pass filters, the inputs of the P _E.   The distribution system further includes a distributed power supply, and inputs the output of the low-pass filter as an output increase / decrease command value to the distributed power supply, and inputs the output of the high-pass filter as an output increase / decrease command value to the power storage device. The storage amount management device according to claim 3, wherein A power storage amount management system comprising a distribution system in which a natural energy power generation device, a power load, a distributed power source, and a power storage device are connected to a host system via a distribution line, and a power storage amount management device connected to the power distribution system. ,
Active power detection means for outputting a total demand P _dem from the sum of effective power outputs of the natural energy power generation apparatus and the sum of power consumption of the power load;
Demand prediction means for predicting the total power consumption of the power load;
Natural energy power generation prediction means for predicting the sum of the effective power output of the natural energy power generation device;
A power flow prediction result is created from the demand prediction result of the demand prediction unit and the output prediction result of the natural energy power generation prediction unit, and the amount of charge of the power storage device in a time zone in which the value of the power flow prediction result is smaller than a reference value to generate a charging plan value P _BS for correcting, and planning means for generating an electric power flow target values P _TG between the upper line,
When the power storage amount of the power storage device is greater than or equal to a first specified value, the planned charging value _PBS is selected, and when the power storage amount of the power storage device is less than the first specified value, the power storage amount is the first specified value. selection means for selecting a preset emergency charging setting value P _BB until exceeding the specified value is greater than a second specified value,
A subtractor for outputting an adjustment amount P _E by subtracting the electric power flow target values P _TG from the total demand P _dem,
A low-pass filter providing enter the adjustment amount P _E in the dispersed type power supply a long-period fluctuation component as the output increases or decreases the command value,
A high-pass filter providing the electricity storage device short-period fluctuation component by inputting the adjustment amount P _E as the output increases or decreases the command value,
An electricity storage amount management system comprising:

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