JP2006141093A - Power storage device and hybrid distributed power system - Google Patents

Power storage device and hybrid distributed power system Download PDF

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JP2006141093A
JP2006141093A JP2004326483A JP2004326483A JP2006141093A JP 2006141093 A JP2006141093 A JP 2006141093A JP 2004326483 A JP2004326483 A JP 2004326483A JP 2004326483 A JP2004326483 A JP 2004326483A JP 2006141093 A JP2006141093 A JP 2006141093A
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power
charge
discharge command
power storage
storage
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JP4256833B2 (en
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Masato Goto
Tetsuo Shigemizu
Masahiro Yoshioka
正博 吉岡
正人 後藤
哲郎 重水
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Kyushu Electric Power Co Inc
Mitsubishi Heavy Ind Ltd
三菱重工業株式会社
九州電力株式会社
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Abstract

[PROBLEMS] To effectively use the amount of power of a power storage device in a remaining capacity region where the power storage device is not overcharged or overdischarged by performing control with priority given to power supply to the system for the purpose of protecting the power storage device. Thus, the output to the electric power system as the entire hybrid distributed power supply system is effectively performed.
A power storage device 1 connected between a distributed power source 2 and a power system 4 and supplying power to the power system 4 so as to suppress output fluctuations of the distributed power source 2 is provided from a control device 13 And a power converter 12 that charges and discharges the power storage device 11 based on the converter power command to be performed, and the control device 13 sets a charge / discharge command for bringing the charge state of the power storage device 11 closer to the target charge state. Conversion that sets the converter power command based on the charge / discharge command setting unit 23, the charge / discharge command set by the charge / discharge command setting unit 23, the target supply power supplied to the power system 4, and the output power of the distributed power source 2. A machine power command setting unit 24 is provided.
[Selection] Figure 1

Description

  The present invention relates to a power storage device that is used in combination with a power generation device that generates power using natural energy and supplies power to an electric power system so as to reduce output fluctuations of the power generation device.

Power generation devices that use natural energy, such as wind power generation devices and solar power generation devices, are attracting attention due to global environmental problems, but their output is greatly affected by weather conditions, making it difficult to generate power according to demand. In addition, since the system voltage and frequency fluctuate due to output fluctuations, the amount of introduction is limited due to restrictions on system operation.
In order to solve such problems, in recent years, by combining a power generation device using natural energy as described above and a power storage device such as a secondary battery, the output variation of the power generation device is absorbed by the power storage device. However, development of a hybrid type distributed power supply system capable of providing high-quality electric power is in progress.
As an electric power storage device used in such a hybrid type distributed power supply system, for example, there is one disclosed in Japanese Patent Laid-Open No. 2001-327080 (Patent Document 1).
In Patent Document 1, an output target value for suppressing fluctuations in output to the power system by the distributed power source is set according to the amount of power stored in the power storage device, and the output to the power system becomes the output target value. Thus, a technique for controlling the power adjustment unit is disclosed.
JP 2001-327080 A (paragraphs “0019” to “0030” and FIGS. 1 to 4)

In the power storage device used in the hybrid distributed power supply system disclosed in Patent Literature 1, an output target value to be supplied to the power system is determined according to the charge amount of the power storage device, and then this output target value The output command value of the power storage device is determined by comparing the output of the power generation device.
Therefore, since the output target value of the hybrid distributed power supply system is determined according to the amount of charge of the power storage device, the output dispersion of the upstream distributed power supply is suppressed, and the power storage is more than the original purpose of supplying stable power. There was a disadvantage that the purpose of protecting the battery of the device was given priority.

  The present invention has been made to solve the above-described problem, and the power storage device is not overcharged or overdischarged by performing control that prioritizes the power supply to the grid rather than the purpose of protecting the power storage device. An object of the present invention is to provide a power storage device and a distributed power supply system capable of effectively performing output to a power system as a whole distributed power supply system while effectively utilizing the amount of power of the power storage device in the remaining capacity region. And

In order to solve the above problems, the present invention employs the following means.
The present invention is connected between a power generation device that generates power using natural energy and a power system to which the power of the power generation device is supplied, and supplies power to the power system so as to suppress output fluctuations of the power generation device. A power storage device for supplying and discharging the power storage device based on a converter power command given from the control device, the control means Supplies a charge / discharge command setting means for setting a charge / discharge command for bringing the charge state of the power storage device closer to a target charge state, the charge / discharge command set by the charge / discharge command setting means, and the power supply system Provided is a power storage device including converter power command setting means for setting the converter power command based on target supply power and output power of the power generator.

According to the present invention, the charge / discharge command setting means sets a charge / discharge command for bringing the charge state of the power storage device closer to the target charge state, and the converter power command setting means is set by the charge / discharge command setting means. A converter power command is set based on the command, target supply power to be supplied to the power system, and output power of the power generator.
Thus, when the converter power command setting means sets the converter power command for controlling the charge / discharge of the power storage device, the converter power command setting means sets the charge / discharge command for bringing the charge state of the power storage device closer to the target charge state as a parameter. Since it is used as one, the state of the power storage device can be kept close to the target. Further, the charge / discharge command setting means sets the charge / discharge command to such a value that gives priority to the power supply to the power system over the purpose of protecting the power storage device, so that the power storage device is overcharged or Output to the power system can be effectively performed while effectively utilizing the amount of power of the power storage device in the remaining capacity region where overdischarge does not occur.

  In the above-described power storage device, the charge / discharge command setting means includes a reference charge / discharge command setting means for setting a reference charge / discharge command for matching a charge state of the power storage device with the target charge state, and the reference It is preferable to provide a proportional device that gives a predetermined gain to the charge / discharge command.

In this way, the charge / discharge command setting means sets the reference charge / discharge command setting means for setting the reference charge / discharge command for matching the charge state of the power storage device with the target charge state, and a predetermined gain for the reference charge / discharge command. Since the proportional device is provided, it is possible to determine the degree of priority given to the charge / discharge control performed in order to make the state of charge of the power storage device reach the target state.
For example, as the gain of the proportional device is set to be larger, control is performed in which charge / discharge control of the power storage device is prioritized so as to bring the charge state of the power storage device closer to the target state than power supply to the power system. The effect of battery protection can be enhanced. On the other hand, as the gain is set smaller, it is possible to realize control in which discharging to the power system is prioritized over whether the battery state is good or bad. Here, if the gain is too small, the control system becomes unstable, so at least the gain needs to be set within a range where the control can be stably performed.
In view of the purpose, the power storage device is ideally used in such a way that the power can be taken out to the maximum extent within a range where the battery state is not overcharged or overdischarged. Therefore, the gain of the proportional device is preferably set as small as possible within a range where the control system does not become unstable. Thereby, it is possible to make maximum use of the power storage device as a power supply source.

In the power storage device described above, it is preferable that the charge / discharge command setting unit includes an integrator that integrates the reference charge / discharge command.
Thus, since the charge / discharge command setting means includes an integrator that integrates the reference charge / discharge command, even when the change amount of the reference charge / discharge command is large, the change amount can be moderated.

In the power storage device described above, the integration time Ti of the integrator and the gain Hp of the proportional unit are Hp> T2 / Ti (where T2 is a delay time when the power of the power conversion means is approximated to a temporary delay element) And T2 ≧ 0) is preferably set so as to satisfy the condition of Ti> 0.
Thus, stable control can be realized by setting the integration time Ti of the integrator and the gain Hp of the proportional device.

In the power storage device described above, it is preferable that the charge / discharge command setting unit includes a limiter.
Thus, since the charge / discharge command setting means includes the limiter, the charge / discharge command given to the converter power command setting means can be suppressed within a predetermined range.

In the power storage device described above, it is preferable that the charge / discharge command setting unit includes a change rate suppression unit that suppresses a change rate of the charge / discharge command to a predetermined value or less.
Thus, since the charge / discharge command setting means includes the change rate suppression means, the change rate of the charge / discharge command given to the converter power command setting means can be suppressed to a predetermined value or less.

  The present invention includes a power storage device and a power conversion unit that charges and discharges the power storage device based on a converter power command, and a power generation device that generates power using natural energy and the power of the power generation device are supplied A method for controlling an electric power storage device that is connected to an electric power system and supplies electric power to the electric power system so as to suppress an output fluctuation of the electric power generation device, wherein the charging state of the power storage device is set to a target charging state The converter power command is set based on a charge / discharge command setting process for setting a charge / discharge command for approaching, the charge / discharge command, target supply power supplied to the power system, and output power of the power generator. Converter charge command setting process, wherein the charge / discharge command setting process sets the charge / discharge command to a value that gives priority to power supply to the power system over the purpose of protecting the power storage device. The A control method for constant electric power storage device.

  According to the present invention, the charging / discharging command setting process sets the charging / discharging command to a value that gives priority to the power supply to the power system over the purpose of protecting the power storage device. Output to the power system can be effectively performed while effectively utilizing the amount of power of the power storage device in the remaining capacity region where overcharge or overdischarge does not occur.

  According to the power storage device of the present invention, control is performed with priority given to power supply to the grid rather than for the purpose of protecting the power storage device, so that the power storage device can store power in the remaining capacity area where overcharge or overdischarge does not occur. The amount of power of the device can be used effectively.

  In the following, one embodiment of the power storage device according to the present invention will be described in the order of [First Embodiment], [Second Embodiment], [Third Embodiment], and [Fourth Embodiment]. Will be described in detail with reference to FIG.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of a hybrid distributed power supply system to which the power storage device according to the first embodiment of the present invention is applied.
As shown in this figure, the hybrid distributed power supply system includes a distributed power supply 2 and a power storage device 1 that outputs power so as to reduce output fluctuations of the distributed power supply 2. The hybrid type distributed power supply system is connected to the power system 4 of the power supply 3 via a grid interconnection transformer (not shown). Here, the power source 3 is, for example, a power source of a power plant of an electric power company, a small-scale independent power source such as a diesel generator on a remote island, or a private power source for a consumer.

In the hybrid distributed power supply system, the distributed power supply 2 is, for example, a wind power generator or a solar power generator, and is a power supply whose output varies depending on the natural environment.
The power storage device 1 includes a power storage device 11 that stores power, a power converter (power conversion means) 12 that controls charging / discharging of the power storage device 11, and a control device (control means) 13. .
The power storage device 11 is, for example, a lithium ion battery, an electric double layer capacitor, or the like, and stores electric power. The power storage device 11 is connected to a power system line that connects the distributed power source 2 and the power system 4 via the power converter 12.
The power converter 12 has a function of sending power from the power storage device 11 to the power supply system 4 and a function of sending power from the power supply system 4 or the distributed power supply 2 to the power storage device 11, and is given from the control device 13. The power storage device 11 is charged and discharged based on the converter power command.

The control device 13 includes a power detector 21, a smoothing circuit 22, a charge / discharge command setting unit (charge / discharge command setting unit) 23, and a converter power command setting unit (converter power command setting unit) 24. Configured.
The power detector 21 detects the output power of the distributed power supply 2 and outputs the detected output power WandSP to the smoothing circuit 22 and the converter power command setting unit 24.
The smoothing circuit 22 sets the target supply power HybP * based on the output power WandSP of the distributed power source 2 acquired from the power detector 21, and outputs the target supply power HybP * to the converter power command setting unit 24. Here, the target supply power HybP * is the target power supplied to the power system 4 and is obtained by, for example, smoothing the power detection WandSP. For this reason, for example, a compensation circuit such as a primary phase delay that suppresses the high frequency band, various filters, and the like are arbitrarily selected and used for the smoothing circuit 22 according to the purpose.

Charging / discharging command setting unit 23 sets charging / discharging command OffsetP * for bringing the charging state of power storage device 11 closer to the target charging state, and outputs this charging / discharging command OffsetP * to converter power command setting unit 24.
The converter power command setting unit 24 outputs the output power WandSP of the distributed power source 2 acquired from the power detector 21, the target supply power HybP * acquired from the smoothing circuit 22, and the charge / discharge command acquired from the charge / discharge command setting unit 23. Based on OffsetP * , a converter power command InvP * is set, and this converter power command InvP * is output to the power converter 12.

The charge / discharge command setting unit 23 includes a charge rate calculation unit 31, a reference charge / discharge command setting unit 32, a first proportional device (proportional device) 33, an integrator 34, an adder 35, and a second And a proportional device 40. Hereinafter, each element constituting the charge / discharge command setting unit 23 will be described in detail.
The charge rate calculation unit 31 calculates the current charge rate (%) of the power storage device based on the battery information of the power storage device 11. FIG. 2 is a functional block diagram illustrating functions provided in the charging rate calculation unit 31. As shown in FIG. 2, the charging rate calculation unit 31 acquires battery information such as the battery current Vo, the battery voltage Io, and the battery internal resistance R at predetermined time intervals from various sensors (not shown) provided in the power storage device 11. . Then, by using these sensor detection values in a predetermined arithmetic expression, the open circuit voltage Vbat of the power storage device 11 is calculated (see S1 and S2 in FIG. 2). Here, the arithmetic expression is represented by, for example, the following expression (1).
Vbat = Vo + Io · R (1)

In the above formula (1), the resistance R varies depending on the temperature, and therefore can be obtained by the following formula (2).
R = R1 {1 + α (t2-t1)} (2)
In the above equation (2), t1 is the previous value of the battery temperature, R1 is the battery internal resistance, α is the battery temperature coefficient, and t2 is the latest value of the battery temperature.

When the charging rate calculation unit 31 calculates the open circuit voltage Vbat of the power storage device 11 using the arithmetic expressions of the above formulas (1) and (2), the charge rate calculation unit 31 has a battery capacity BatW that can be discharged from the open voltage Vbat in advance. It calculates based on the battery data table which exists (refer S3 of FIG. 2).
This battery data table is a table in which the open circuit voltage Vbat and the battery capacity BatW are associated with each other. When the battery capacity BatW is obtained using the battery data table, the battery capacity BatW is divided by the maximum battery capacity BatWmax, and further multiplied by 100 to obtain the charging rate BatC ′ (see S4 in FIG. 2). . Since the charging rate BatC ′ obtained here varies due to voltage noise, the charging rate is smoothed by passing it through a filter (for example, a temporary delay function having a time constant of about 60 s) (see S5 in FIG. 2). Then, the smoothed charging rate BatC is output to the subtracter 32 shown in FIG.
The battery data table shown in S3 and the maximum battery capacity BatWmax used in S4 can be changed according to the deterioration state according to the battery discharge amount.

Returning to FIG. 1, the subtractor 32 calculates a difference between the current charging rate BatC acquired from the charging rate calculation unit 31 and a preset target charging rate BatC *, and uses this difference as a reference charge / discharge command. 1 to the proportional unit 33 and the integrator 34.
The first proportional device 33 gives a predetermined proportional gain Hp to the reference charging command acquired from the subtracter 32, and outputs the result to the adder 35.
The integrator 34 integrates the reference charging command acquired from the subtracter 32 with a predetermined integration time Ti, and outputs the result to the adder 35. Details of the setting of the proportional gain Hp and the integration time Ti will be described later.

The adder 35 outputs a value Offsetpi * (%) obtained by adding the output values from the subtractor 32 and the integrator 34 to the second proportional device 40. The second proportional device 40 multiplies the value Offsetpi * (%) acquired from the adder 35 by the output power InvP of the power converter 12, and further divides this value by 100 as the charge / discharge command OffsetP *. Output.
Thus, the charge / discharge command OffsetP * set by the charge / discharge command setting unit 23 is output to the converter power command setting unit 24 described above, and the charge / discharge command OffsetP * sets the converter power command InvP * . It will be used as one of the parameters.

Next, the operation of the power storage device 1 having the above-described configuration will be briefly described.
The output power of the distributed power source 2 is detected by the power detector 21 at predetermined time intervals, and the output power WandSP that is the detected value is output to the smoothing circuit 22 and the converter power command setting unit 24. The smoothing circuit 22 sets the target supply power HybP * based on the output power WandSP of the distributed power source 2 acquired from the power detector 21, and outputs the target supply power HybP * to the converter power command setting unit 24.
On the other hand, the charge / discharge command setting unit 23 charges the power storage device 11 by the operation of the charge rate calculation unit 31, the subtractor 32, the first proportional device 33, the integrator 34, the adder 35, and the second proportional device 40. The charge / discharge command OffsetP * for setting the state close to the target charge state is set, and this charge / discharge command OffsetP * is output to the converter power command setting unit 24.

As a result, the converter power command setting unit 24 receives the output power WandSP of the distributed power source 2 from the power detector 21, the target supply power HybP * from the smoothing circuit 22, and the charge / discharge command OffsetP from the charge / discharge command setting unit 23. * Is entered respectively. Converter power command setting section 24, a value obtained by subtracting the output power WandSP from the target supply electrical power HybP *, by adding the charge and discharge command OFFSETP *, set the converter power command INVP *, the converter power command InvP * is output to the power converter 12.
Thereby, power supply from the power storage device 11 or to the power storage device based on the converter power command InvP * is realized by the power converter 12.
As described above, the charge / discharge command OffsetP * set based on the charging rate of the power storage device 11 that changes every moment is fed back to the converter power command unit 24, and the charge / discharge command OffsetP * is returned to the converter power command InvP. Since it is used as one of the parameters when setting * , it is possible to realize power supply that suppresses power fluctuations of the distributed power supply 2 while taking into account the state of charge of the power storage device 11.

Next, a method for setting the proportional gain Hp of the first proportional device 33 and the integration time Ti of the integrator 34 of the charge / discharge command setting unit 23 will be described.
First, the proportional gain Hp of the proportional device 33 and the integration time Ti of the integrator 34 are set so as to satisfy the conditions shown in the following equations (3) to (5).
Ti> 0 (3)
T2 ≧ 0 (4)
Hp> T2 / Ti (5)
Here, T2 is the primary delay time of the power converter 12.

Hereinafter, a method for deriving the proportional gain Hp and the integration time Ti will be described.
For example, each element of the control device 13 shown in FIG. 1 is numerically modeled to obtain a transfer function of the entire control device 13.
First, as an example, when the smoothing circuit 22 is treated as a control model having a first-order lag transfer function, the target supply power HybP * , which is the output of the smoothing circuit, is expressed by the following equation (6).
HybP * = {1 / (1 + sT1)}. WandSP (6)
Here, s is a Laplace operator, and T1 is a temporary delay time (s).

Subsequently, the converter power command InvP * set by the converter power command setting unit 24 is expressed by the following equation (7) unless the charge / discharge command OffsetP * is taken into consideration.
InvP * = HybP * -WandSP (7)
Next, in consideration of the primary delay time T2 when the control delay of the power converter 12 is equivalently expressed by the primary delay, the output power InvP of the power converter 12 is expressed by the following equation (8). .
InvP = {1 / (1 + sT2)}. InvP *
= {1 / (1 + sT2)}. (HybP * −WandSP) (8)

On the other hand, since the charging rate BatC of the power storage device 11 changes with the output power InvP of the power converter 12, it can be expressed using the output power InvP of the power converter 12.
Here, if the power converter efficiency and the secondary battery efficiency in all operating states are known, the charging rate BatC of the power storage device 11 is expressed by the following equation (9).
In the above equation (9), α is a constant related to the power converter efficiency, β is a constant related to the secondary battery efficiency, and 3600Ph is a value obtained by converting the battery rated power amount from time to seconds.

Next, the control model of the charge / discharge command setting unit 23 shown in FIG. 1 can be expressed by a transfer function of the following equation (10).

In consideration of the above, when the control device 13 shown in FIG. 1 is represented as a control model, a block diagram as shown in FIG. 3A can be obtained.
Here, when the block diagram of the feedback system shown in FIG. 3A is an open loop, the transfer functions related to the power storage device 11 and the charge / discharge command setting unit 23 are combined into one, as shown in FIG. Can be expressed as As a result, the transfer function related to the power storage device 11 and the charge / discharge command setting unit 23 is expressed by the following equation (11).

In order to simplify the control model, assuming that α = β = 1 and the case where the power converter efficiency and the secondary battery efficiency are 100%, the transfer function related to the power storage device 11 and the charge / discharge command setting unit 23 Is represented by the following equation (12).

Here, the characteristic equation of the transfer function is a denominator in the above equation (12). Then, when the conditions of Ti, T2, and Hp at which this characteristic equation becomes stable are determined by the stability determination of Rous and Fluwitz, the conditions of the above-described equations (3), (4), and (5) are obtained. Can do.
Here, the proportional gain Hp of the first proportional device 33 can be referred to as a parameter that determines the degree to which the charge / discharge control performed in order to make the state of charge of the power storage device 11 reach the target state is prioritized. . For example, as the gain Hp of the first proportional device 33 is set to a larger value, the charge / discharge control is performed so that the charged state of the power storage device 11 is closer to the target state than the power supply to the power system 4. Therefore, the effect of battery protection can be enhanced.
On the other hand, as the gain is set smaller, it is possible to realize control in which discharging to the power system 4 is prioritized over whether the battery state is good or bad.
The power storage device 1 is ideally used in such a manner that the power can be extracted to the maximum extent within a range where the battery state is not overcharged or overdischarged. Therefore, the gain Hp of the first proportional device is preferably set to a value as small as possible within a range in which the control system does not become unstable, that is, in a range that satisfies the conditions of the above formulas (3) to (5). . Thereby, it is possible to make maximum use of the power storage device 1 as a power supply source.

As described above, according to the power storage device 1 according to the present embodiment, the charge / discharge command setting unit 23 sets the charge / discharge command OffsetP * for bringing the charge state of the power storage device 11 closer to the target charge state, Based on the charge / discharge command OffsetP * set by the charge / discharge command setting unit 23 by the converter power command setting unit 24, the target supply power HybP * supplied to the power system 4, and the output power WandSP of the power generator 11. Set power command InvP * .
Thus, when the converter power command setting unit 24 sets the converter power command InvP * for controlling the charge / discharge of the power storage device 11, the charge / discharge for bringing the charge state of the power storage device closer to the target charge state. Since the command OffsetP * is used as one of the parameters, the state of the power storage device 11 can be kept close to the target.
Further, the charge / discharge command setting unit 23 sets the charge / discharge command OffsetP * , that is, the first value so that the power supply to the power system 4 is prioritized over the purpose of protecting the power storage device 11. By setting the gain Hp of the proportional device 33, the output to the power system 4 can be effectively achieved while effectively using the amount of power of the power storage device 11 in the remaining capacity region where the power storage device 11 is not overcharged or overdischarged. Can be done automatically.
Furthermore, since the charge / discharge command setting unit 23 includes an integrator 34 that integrates the reference charge / discharge command, the change amount can be moderated even when the change amount of the reference charge / discharge command is large.

  Note that the control device 13 of the power storage device 1 described above may be realized by hardware such as an analog circuit or may be realized by processing by a microcomputer. When realized by a microcomputer, the functions realized by each component of the control device 13 are stored in a memory in the form of a program, and the CPU reads the program from the memory and executes it, thereby realizing the above-described operation. To do.

[Second Embodiment]
Next, a power storage device according to the second embodiment of the present invention will be described. FIG. 4 is a schematic configuration diagram of a hybrid distributed power supply system to which the power storage device according to the second embodiment of the present invention is applied.
The power storage device according to the present embodiment has substantially the same configuration as the power storage device according to the first embodiment described above, but the charge / discharge command setting unit 23 further includes an upper / lower limiter (limiter) 36. It is different.
Specifically, the upper / lower limiter 36 is provided between the adder 35 and the second proportional device 40. The upper / lower limiter 36 limits the value Offsetpi * output from the adder 35 of the charge / discharge command setting unit 23 so as to be within the range of the minimum value LL to the maximum value HH, and outputs it. The offset command Offsetlimit * from the upper / lower limiter 36 is input to the second proportional device 40 to give a predetermined gain, and the charge / discharge command OffsetP * is output to the converter power command setting unit 24.
As described above, according to the power storage device according to the present embodiment, since the charge / discharge command setting unit 23 includes the upper and lower limiter 36, the charge / discharge command OffsetP * given to the converter power command setting unit 24 is set to a predetermined value. It becomes possible to suppress within the range, and controllability can be improved.

[Third Embodiment]
Next, a power storage device according to the third embodiment of the present invention will be described. FIG. 5 is a schematic configuration diagram of a hybrid distributed power supply system to which the power storage device according to the third embodiment of the present invention is applied.
The power storage device according to the present embodiment has substantially the same configuration as the power storage device according to the second embodiment described above, but the charge / discharge command setting unit 23 further includes a change rate limiter (change rate suppressing means) 37. Is different.

Specifically, the change rate limiter 37 is provided between the upper and lower limiter 36 and the second proportional device 40. The limited offset command Offsetlimit * output from the upper / lower limiter 36 is input to the change rate limiter 37. The change rate limiter 37 limits the change rate of the offset command to a predetermined value or less, and outputs the post-limit offset command Offsetrmp * to the second proportional device 40. The second proportional device 40 gives a predetermined gain to the offset command Offsetrmp * from the change rate limiter 37. This value is output to the converter power command setting unit 24 as a charge / discharge command OffsetP * .
As described above, according to the power storage device according to the present embodiment, since the charge / discharge command setting unit 23 includes the change rate limiter 37, the change rate of the charge / discharge command OffsetP * to be given to the converter power command setting unit 24. Can be suppressed to a predetermined value or less, and controllability can be improved.

[Fourth Embodiment]
Next, a power storage device according to the fourth embodiment of the present invention will be described. FIG. 6 is a schematic configuration diagram of a hybrid distributed power supply system to which a power storage device according to the fourth embodiment of the present invention is applied.
The power storage device according to the present embodiment has substantially the same configuration as the power storage device according to the third embodiment described above, but is different in that the charge / discharge command setting unit 23 further includes a differentiator 38.

Specifically, the differentiator 38 is provided between the subtractor 32 and the adder 35 in parallel with the proportional device 33 and the integrator 34. The reference charge / discharge command output from the subtractor 32 is differentiated by being input to the differentiator 38 and is output to the adder 35.
Thus, according to the power storage device according to the present embodiment, since the charge / discharge command setting unit 23 includes the differentiator 38, controllability can be improved.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

1 is a schematic configuration diagram of a hybrid distributed power supply system to which a power storage device according to a first embodiment of the present invention is applied. FIG. 2 is a functional block diagram illustrating functions realized by a charging rate calculation unit 31 in FIG. 1. It is the figure which represented the control apparatus of FIG. 1 as a control model. It is the structure schematic of the hybrid type distributed power supply system to which the electric power storage apparatus which concerns on the 2nd Embodiment of this invention is applied. It is the structure schematic of the hybrid type distributed power supply system to which the electric power storage apparatus which concerns on the 3rd Embodiment of this invention is applied. It is the structure schematic of the hybrid type distributed power supply system to which the electric power storage apparatus which concerns on the 4th Embodiment of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power storage device 2 Distributed power supply 11 Power storage device 12 Power converter 13 Control device 21 Power detector 22 Smoothing circuit 23 Charge / discharge command setting unit 24 Converter power command setting unit 31 Charge rate calculation unit 32 Subtractor 33 First Proportionator 34 Integrator 35 Adder 36 Upper / lower limiter 37 Change rate limiter 38 Differentiator 40 Second proportionalizer

Claims (8)

  1. Power that is connected between a power generation device that generates power using natural energy and a power system to which the power of the power generation device is supplied, and that supplies power to the power system so as to suppress output fluctuations of the power generation device A storage device,
    A power storage device, a control means, and a power conversion means for charging and discharging the power storage device based on a converter power command given from the control means,
    The control means includes
    Charge / discharge command setting means for setting a charge / discharge command for bringing the charge state of the power storage device close to the target charge state;
    Converter power command setting means for setting the converter power command based on the charge / discharge command set by the charge / discharge command setting means, target supply power supplied to the power system, and output power of the power generator A power storage device comprising:
  2. The charge / discharge command setting means includes:
    A reference charge / discharge command setting means for setting a reference charge / discharge command for making the charge state of the power storage device coincide with the target charge state;
    The power storage device according to claim 1, further comprising a proportional device that gives a predetermined gain to the reference charge / discharge command.
  3.   The power storage device according to claim 1, wherein the charge / discharge command setting unit includes an integrator that integrates the reference charge / discharge command.
  4. The integration time Ti of the integrator and the gain Hp of the proportional device are:
    Hp> T2 / Ti and Ti> 0 (where T2 is a delay time when the power of the power conversion means is approximated to a temporary delay element, and is set to satisfy the condition of T2 ≧ 0). The power storage device according to claim 3.
  5.   The power storage device according to any one of claims 1 to 4, wherein the charge / discharge command setting means includes a limiter.
  6.   The power storage device according to any one of claims 1 to 5, wherein the charge / discharge command setting unit includes a change rate suppressing unit that suppresses a change rate of the charge / discharge command to a predetermined value or less.
  7. The power storage device according to any one of claims 1 to 6,
    A hybrid distributed power supply system comprising a power generation device that generates power using natural energy.
  8. A power storage device, a power conversion unit that charges and discharges the power storage device based on a converter power command, a power generation device that generates power using natural energy, and a power system to which the power of the power generation device is supplied A control method of a power storage device that is connected in between and supplies power to the power system so as to suppress output fluctuations of the power generation device,
    A charge / discharge command setting process for setting a charge / discharge command for bringing the charge state of the power storage device close to the target charge state;
    A converter power command setting process for setting the converter power command based on the charge / discharge command, target supply power to be supplied to the power system, and output power of the power generator, and
    A control method for a power storage device, wherein the charge / discharge command setting process sets the charge / discharge command to a value such that control is performed with priority given to power supply to the power system over the purpose of protecting the power storage device.
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