JP2019140862A - Storage battery-combined renewable energy generator system - Google Patents

Abstract

To provide a storage battery-combined renewable energy generator system that uses a storage battery combined with a renewable energy generator so as to supply adjustment power for system stabilization while reducing variation in power generation value of the renewable energy generator.SOLUTION: A storage battery-combined renewable energy generator system consists of: a renewable energy generator; a storage battery; a renewable energy generation prediction part which predicts a renewable energy generatable value; a power dealing information reception part which receives power dealing information; a storage battery WF control calculation part which calculates, from a renewable energy generation predicted quantity that the renewable energy generation prediction part predicts and the power dealing information, command values of electric power dealing generation W2, renewable energy generation W1, and storage battery charging and discharging; and a power converter which distributes electric power according to the power dealing generation W2 and renewable energy generation W1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a renewable energy generator system with a storage battery.

  In order to suppress CO2 emissions, it is necessary to increase the ratio of renewable energy such as solar power generation and wind power generation instead of fossil fuels as an energy source for supplying electric power. When the thermal power generator is disconnected, the ability to supply adjustment power for system stability with respect to fluctuations in demand decreases. On the other hand, each renewable energy generator may be provided with a storage battery for alleviating fluctuations in its power generation value. Since the storage battery capacity is designed for the situation where the fluctuation of the wind power generation value is the most severe, the capacity of the storage battery remains unused during the period when the power generation can be stably performed according to the season and the weather. Therefore, if the capacity of this storage battery can be utilized as an adjustment power, it can contribute to system stability.

  As a prior art for contributing to system stability, for example, in WO2011 / 099142 (Patent Document 1), it is fixed by charging / discharging a storage battery with generated power obtained by wind power generation output from a wind power generator. A storage battery combined wind power generation system that outputs electric power to an electric power system is disclosed. At this time, the amount of tidal power for each tidal current is measured for the charging power, and the power purchased from other power generation companies and the power generated by own wind power generation are classified. Two types are distinguished as the power to charge the storage battery.

  Further, as a prior art for contributing to other system stability, for example, Japanese Patent Laid-Open No. 2006-204081 (Patent Document 2) describes fluctuations in wind power generation values due to charging / discharging of storage batteries of electric vehicles owned by consumers. A supply and demand adjustment method is disclosed.

WO2011 / 099142 JP 2006-204081 A

  Wind generator-owned batteries for fluctuation mitigation not only satisfy the fluctuation mitigation conditions for renewable energy, but can also be effectively used by providing battery capacity for ancillary services. None of the prior art documents discloses a storage battery that achieves both relaxation of fluctuations in wind power generation and provision of power for adjusting power, and details of charging and discharging are not disclosed.

  Accordingly, an object of the present invention is to provide a storage battery side wind power generation system that provides storage battery capability for ancillary services while satisfying the fluctuation relaxation conditions of renewable energy using a storage battery for fluctuation relaxation owned by a wind power generator There is to do.

  The present invention for solving the above problems is a renewable energy generator system with a storage battery, comprising a renewable energy generator, a storage battery system, a control unit for controlling the renewable energy generator and the storage battery system, and a power converter. is there. The renewable energy generator is a wind generator, solar generator, hydroelectric generator, biomass generator or a combination of a plurality of generators, and receives an output upper limit command value output from the control unit. The function to suppress the generated power below the value is provided. The storage battery system includes one or more storage batteries, and charges and discharges the storage battery according to a charge / discharge command value output from the control unit. Also, the current charging rate (SOC value: State Of Charge) is output.

Further, the renewable energy generator has a function of receiving the output upper limit command value and suppressing the generated power below the output upper limit command value. The storage battery system
The battery is charged / discharged according to the charge / discharge command value, and has a function of outputting the current SOC value.

  The control unit of the renewable energy generator system with storage battery is configured as follows. The renewable energy power generation prediction unit has a function of predicting a renewable energy power generation possible value. The power transaction information receiving unit receives power transaction information from outside the system. The storage battery WF control calculation unit calculates the power transaction power generation W2, the output upper limit command value, and the charge / discharge command value from the renewable energy power generation possible value, the power transaction information, and the SOC value.

  The power converter shunts specified power from the renewable energy generator and the storage battery system. Specifically, it has a function of distributing the power transaction power generation W2 by subtracting the power transaction power generation W2 from the total value W1 of the renewable energy generator power generation value and the charge / discharge command value.

  According to the renewable energy generator system with storage battery of the present invention, the fluctuation of the power generation value of the renewable energy generator is reduced by using the renewable energy generator and the storage battery attached to the renewable energy generator. However, it is possible to supply adjustment power for system stability.

The figure which showed the example of a structure of the renewable energy generator system 1000 with a storage battery which concerns on 1st and 2nd embodiment. The figure which showed the example of the electric power generation value ((a): W1 output, (b): Storage battery output, (c): Storage battery charge rate) of the renewable energy generator system 1000. The figure which showed the example which calculates storage battery dischargeable amount from SOC. The figure of the processing flow of the renewable energy generator system 1000 with a storage battery. The figure of the processing flow of the renewable energy generator system 1000 with a storage battery. The figure of the processing flow of the renewable energy generator system 1000 with a storage battery. The figure which showed the example of the renewable energy electric power generation value which concerns on 2nd Embodiment. The figure which showed the example of the renewable energy electric power generation value which concerns on 2nd Embodiment. The figure which showed the example of the renewable energy electric power generation value which concerns on 2nd Embodiment. The figure of the processing flow of the renewable energy generator system 1000 with a storage battery. The figure which showed the example of a structure of the electric power generation system which concerns on 3rd Embodiment. The figure which showed the example of the renewable energy electric power generation value which concerns on 3rd Embodiment. The figure which showed the example of the renewable energy electric power generation value which concerns on 4th Embodiment. The figure which showed the example of the renewable energy generator system 3000 containing the some wind power generation site which concerns on 5th Embodiment. The figure which showed the example of the renewable energy generator system 2000 of each wind power generation site which concerns on 5th Embodiment. The figure of the processing flow of the renewable energy generator system 2000 with a storage battery. The figure of the processing flow of the renewable energy generator system 3000 with a storage battery.

  As renewable energy generators that do not use fossil fuels such as oil and coal, wind power generation, solar power generation, hydroelectric power generation, biomass power generation, and the like are being studied. While these renewable energies are not subject to depletion, the amount of power generated varies depending on the season, time of day, and weather conditions. Therefore, in order to supply power stably, it has been proposed to use a plurality of types of generators having different energy sources in combination, or to supply power by reducing the fluctuation of generated power by providing a storage battery.

Since the operating rate of the renewable energy generator varies depending on the season and time zone, an electricity storage value is provided to alleviate the variation. Moreover, since the fluctuation | variation changes with existing installations or time zones as mentioned above, there is a fluctuation in the remaining capacity of the charge / discharge capacity of the rechargeable battery, and a storage battery having a margin for relaxing fluctuation of electric power provided from the power generation facility is provided. .

On the other hand, against the power instability caused by the connection of renewable energy generated power to the commercial power system, the importance of maintaining power quality by system stabilization increases, and various power quality adjustments (ancillary services) Has been made. Therefore, by using the room for the charge / discharge capacity of the rechargeable battery, it is possible to stabilize the system and to provide efficient energy.

In order to achieve the above, the present invention provides a regenerative energy power generation system with a storage battery that contributes to the stabilization of the power system using the remaining capacity of the storage battery for mitigating fluctuations, and provides high-efficiency power generation and power system The purpose is to contribute to the stabilization of

  Therefore, we decided to use the remaining capacity of the storage battery for system stabilization by using a renewable energy generator system with storage battery. For example, in a wind power generation facility, the operating rate decreases with the season, and there is a surplus in the charging capacity of the storage battery for fluctuation mitigation. Therefore, with one storage battery facility, fluctuation relaxation of the wind power generation facility and charge / discharge for system stabilization of one or a plurality of power systems can be achieved at the same time.

  When using storage battery equipment for the above purpose, the charge / discharge power provided by the storage battery is controlled by separating the power connected to the system by suppressing fluctuations in the renewable energy power generation equipment and the charge / discharge power for system stabilization. There is a need to. Therefore, it is preferable to provide a distributed power amount determination unit that determines a power distribution amount for distributing the power amount provided from the storage battery to both, and commands distribution.

  Further, the regenerative energy power generation facility on the storage battery side needs to be capable of discharging for mitigating fluctuations in the wind power generation facility at the time of discharging for system stabilization. Therefore, the electric power (kW / kWh) required for mitigating fluctuations in the generated power in the future is estimated from the power demand information such as weather conditions and power transaction information, and the storage battery is charged in consideration of the predicted power generation amount. It is preferable. Therefore, it is preferable to provide a storage battery control unit that controls charging and discharging.

  Specifically, it receives power transaction information and weather information, calculates a storage battery charge / discharge amount necessary for fluctuation mitigation from the power generation amount of the renewable energy generator at future time t, and controls charge / discharge.

  In this way, while maintaining both the grid connection requirements and the power trading conditions, the capacity of the storage battery installed in the renewable energy generator is utilized to mitigate fluctuations in the power generation value of the renewable energy generator. It is possible to contribute to stable power supply by supplying adjustment power for system stability.

  FIG. 1 shows an example of a renewable energy generator system 1000 with a storage battery according to the first embodiment. Here, wind power generation will be described as an example of renewable energy. In addition, adjustment power for system stability shall be provided through power transactions for ancillary services. The regenerative energy generator system 1000 with a storage battery according to the present embodiment includes a power meter M2, a power converter (BTB (Back-to-back)) 8 that divides a power flow, and a WF control unit 200.

  First, the components for satisfying the imposed fluctuation mitigation requirements will be explained. Next, in addition to the imposed fluctuation mitigation requirements, which are characteristic features, the components for balancing power transactions for grid stability Will be explained.

  The regenerative energy generator system 1000 with a storage battery outputs generated power that complies with the fluctuation mitigation requirements as wind power generation via the power line 101. Moreover, the electric power meter M1 for measuring it is provided. Electricity as wind power generation satisfies the imposed mitigation requirements. For example, a configuration is provided in which each device is controlled such that the difference between the maximum value and the minimum value of the power generation value within a certain time frame becomes a certain value.

  The wind power generation facility 2 is a facility that receives wind and generates power according to the output upper limit command value. Wind power generation refers to power generation in the case of wind power generation without receiving output suppression. When the wind power generation facility 2 receives the output upper limit command value from the WF control unit 200 and the wind power generation value is larger than the output upper limit command value, the wind power generation equipment 2 suppresses the generated power so that the generated power becomes the output upper limit command value, If the wind power generation value is weaker than the output upper limit command value, the wind power generation value is generated. The power meter M0 measures the generated power of the wind power generation facility.

  The storage battery system 3 includes one or a plurality of storage batteries (not shown), a power exchanger for converting charging / discharging to alternating current, and an SOC detection unit that measures or estimates the SOC of the storage battery and outputs it. The SOC detection unit may be provided in the WF control unit 200 instead of the storage battery system 3.

    The storage battery system 3 is charged / discharged in response to a charge / discharge command from the WF control unit 200. However, depending on the SOC state at that time, charging and discharging may not be performed as directed. If the SOC is 100%, the battery cannot be charged. If the SOC is 0%, the battery cannot be discharged. Therefore, the storage battery system 3 measures or estimates the SOC of the storage battery from the voltage value and the previous charge / discharge history, and outputs the value to the WF control unit 200 (storage battery WF control calculation unit 6). The WF control unit 200 sets the charge / discharge command value output to the storage battery system 3 within a chargeable / dischargeable range according to the SOC state. Further, the WF control unit 200 receives the past value of the measurement value of the power meter M1, and calculates the charge / discharge command value of the storage battery and the output upper limit command value of the wind power generation facility 2 so as to satisfy the fluctuation mitigation requirements. .

  In addition, the calculation method of the command value in the case of not performing power trading is not limited to a specific means (for example, the method described in Japanese Patent No. 5501183 can be used).

  Next, the characteristic part will be described. The regenerative energy generator system 1000 with storage battery outputs power to the power system according to up / down transaction power (adjustment power) for system stabilization via the power line 102 while satisfying the above-mentioned fluctuation mitigation requirements. Receive from the system. The up / down trade power for grid stabilization must comply with the power input / output directives in accordance with the power trade contract. On the other hand, electric power as wind power generation must satisfy the imposed fluctuation mitigation requirements. Therefore, in order to measure the power for adjusting power, the power line 102 is provided with a power meter M2 separately from the power meter M1 provided on the power line to the grid. By providing the power meter M1, it is possible to show that the renewable energy generator system with storage battery 1000 satisfies the fluctuation mitigation requirements, and by providing the power meter M2, the evidence of the power supplied to the system as adjustment power is shown Is possible.

  The power transaction information receiving unit 4 receives the power transaction information P (t) necessary for system stability as a power input / output command according to the power transaction contract from the Internet or a dedicated line, and outputs it to the storage battery WF control calculation unit 6. To do. Here, it is assumed that the power transaction contract is a contract for an up / down transaction for outputting / inputting power in response to P (t) within a range of −P_MAX <P (t) <P_MAX. P_MAX is a value indicating the upper limit value of the trading power negotiated in the power trading contract. If P (t) is a positive value, the renewable energy generator system 1000 with storage battery flows power to the power system side via the power line 102 as a transaction to increase the power. If P (t) is a negative value, power is received from the power system side via the power line 102 as a transaction for lowering the power.

  The wind power generation value prediction unit 5 receives the weather information and predicts the wind power generation prediction value Wf (t) as the wind power generation value of the wind power generation facility 2. Further, the wind power generation value prediction unit 5 measures the current wind power generation value. The wind power generation value prediction unit 5 outputs the wind power generation prediction value Wf (t) and the wind power generation value to the storage battery WF control calculation unit 6. Here, the weather information is the weather forecast of the area where the wind power generation facility 2 is located and the current weather information of other areas. Includes cloud and barometric arrangements. Then, the wind power generation value prediction unit 5 predicts the wind power generation value after the current time from the weather information and the wind power generation value until immediately before. The wind power generation predicted value Wf (t) is a predicted value of the power generation value of the wind power generation facility at each time from a few seconds ahead to a few hours from the current time, and is updated at predetermined intervals. The wind power generation prediction value Wf (t) predicts wind-like power generation without output suppression. The wind-like power generation value can be suppressed to a wind-like power generation value or less by applying output suppression control. The wind power generation value or the wind power generation predicted value Wf (t) that is not restrained is hereinafter referred to as a renewable energy power generation possible value and a predicted value in order to distinguish it from the post-control power generation value.

  The storage battery WF control calculation unit 6 receives the power transaction information P (t), the wind power generation predicted value Wf (t), the past value of the measured value of the power meter M1, the SOC of the storage battery, and outputs the charge / discharge command value of the storage battery, the output Calculate the upper limit command value, W1 output value, and W2 output value. The calculation method will be described later with reference to FIGS. The regenerative energy generator system 1000 with storage battery according to the present embodiment is configured to capture the measurement value of the power meter M1, but as illustrated in FIG. 13, the measurement value of the power meter M0 is captured and the past value of the storage battery charge / discharge command value is obtained. It can also be used by calculating using Alternatively, when an abnormality occurs in communication of the power meter M1, the measurement value of the power meter M0 may be taken in and calculated using the past value of the storage battery charge / discharge command value. The electric power meter M0, the electric power meter M1, and the electric power meter M2 have a function of storing data for storing past measurement values.

  The storage battery WF control calculation unit 6 includes an I / F that holds and displays a history of fluctuation relaxation compliance rate, power transaction compliance history, storage battery cycle number progress, and SOC state history. Thereby, the operator can confirm how each value required for control of the renewable energy generator system 1000 with a storage battery was calculated.

  When the wind power generation value of the wind power generation facility 2 is 0 and a reduction transaction is received as power transaction information, the storage battery WF control calculation unit 6 supplies power from the grid within the range of chargeable values of the storage battery system 3. In response, the storage battery system 3 is charged. This is common to the other embodiments.

  The power converter (BTB8) that divides the power flow diverts the power designated as W2 from the power of the wind power generation facility 2 and the storage battery system 3 output through the power line 103 and the power line 104 to the power line 102. The BTB 8 includes a transformer 15 on the connection side to the power line 102 and a transformer 16 on the connection side to the power line 104. Either one of the transformer 15 and the transformer 16 must be provided. Since the power lines 101, 102, and 105 constitute a loop, the transformer 15 or the transformer 16 cuts the zero-phase path, and has an effect of stable operation and noise diffusion prevention.

  With reference to FIG. 2, the values and the outline of the processing related to the internal processing of the renewable energy generator system 1000 with storage battery will be described. FIG. 2 is a diagram showing an example of the power generation value of the renewable energy generator. In FIG. 2 (a), the horizontal axis represents time, the vertical axis represents the power generation output, and shows the W1 output measured by the power meter M1. In order to simplify the explanation, in this figure, the power value measured by the power meter M2 for power trading is assumed to be zero. In FIG. 2 (b), the horizontal axis represents time, the vertical axis represents the output value of the storage battery system 3, discharge takes a positive value, and charge takes a negative value. In FIG. 2 (c), the horizontal axis represents time, and the vertical axis represents the charging rate of the storage battery included in the storage battery system 3. The horizontal time of (a) to (c) is the same time.

The W1 output measured by the power meter M1 shown in (a) is subject to fluctuation mitigation requirements for linking to the power system, and the fluctuation mitigation requirement is that the difference between the maximum value and the minimum value for n minutes is less than L And (a) shows a W1 upper limit value and a W1 lower limit value, which are allowable ranges of the W1 output for satisfying the above-mentioned fluctuation mitigation requirements at each time. The storage battery WF control calculation unit 6 calculates a charge / discharge value, an output upper limit command value, and a W2 output command value from the wind power generation predicted value Wf (t) so that W1 upper limit value ≧ W1 output ≧ W1 lower limit value. A wind power generation predicted value Wf (t) is shown as a wind-generated power generation value and its predicted value. At time t1, W1 output value (t1) = wind power generation value (t1), and even if there is no charge / discharge from the storage battery, the wind power generation value is not more than the W1 upper limit value and not less than the W1 lower limit value. At time t2, since the wind power generation value falls below the lower limit value, the W1 output becomes the same as the lower limit value by discharging from the storage battery, thereby satisfying the requirement. At time t3, since the wind power generation value exceeds the upper limit value, the storage battery is charged so that the W1 output becomes the same as the upper limit value, thereby satisfying the requirements.

When the storage battery is discharged, the storage battery SOC decreases as shown in (c), and the storage battery SOC increases when charging is performed. Further, the storage battery chargeable value Xc and the storage battery dischargeable value Xd change according to the SOC due to the terminal voltage restriction of the storage battery. The storage battery WF control calculation unit 6 calculates a storage battery chargeable value Xc and a storage battery dischargeable value Xd from the SOC. The calculation method will be described later with reference to FIG. (a) shows a storage battery chargeable value Xc and a storage battery dischargeable value Xd corresponding to the SOC value at each time.

  The storage battery WF control calculation unit 6 calculates the power that can be supplied to the power transaction at each time as follows.

When used for determining control, the storage battery WF control calculation unit 6 uses a wind power generation predicted value Wf (t), which is a predicted value of the wind power generation value, instead of the wind power generation value.

At time t1, W1 output value (t1) = wind power generation value (t1), but lower the W1 output value (t1) to the W1 lower limit value (wind power generation value-W1 lower limit value). It can be accommodated in reduced power trading. This is W2 lower tradeable value 1 (t1). However, in order to lower the W1 output value to the W1 lower limit value, it is necessary to charge the storage battery with the difference between the wind power generation value and the W1 lower limit value. That is, the W1 output value can be lowered only to the storage battery chargeable value Xc (t). The lower power transaction can be accommodated by the smaller value of W2 lower tradeable value 1 (t) and storage battery chargeable value Xc (t). Further, the W1 lower limit value is calculated by the maximum value -L of the W1 output value for the immediately preceding n minutes, and the W1 upper limit value is calculated by the minimum value of the W1 output value for the immediately preceding n minutes + L.

W2 lower tradeable value 1 (t) = wind power generation forecast value Wf (t)-W1 lower limit (t) (1 formula)
W2 lower tradeable value = MIN (W2 lower tradeable value 1 (t), storage battery chargeable value Xc (t)) (2 formulas)
Discharge value for fluctuation relaxation Zd (t) = 0
Fluctuation charge value Zc (t) = 0

  Similarly, it is possible to increase the amount of power of W1 upper limit value−wind power generation value to be flexible for power transactions, and this is set as W2 increase transaction possible value 1 (t1). What can be accommodated in the increased power transaction is the smaller value of the W2 increase transaction possible value 1 (t) and the storage battery chargeable value Xc (t).

W2 increase tradeable value 1 (t) = W1 upper limit value (t)-wind power generation prediction value Wf (t) (3 formulas)
W2 up tradeable value = MIN (W2 up tradeable value 1 (t), storage battery dischargeable value Xd (t)) (Expression 4-1)
Fluctuation discharge value Zd (t) = 0 ... (Formula 4-2)
Charge value for fluctuation relaxation Zc (t) = 0 ... (4-3)

  At time t2, since the wind power generation value falls below the W1 lower limit value, the battery is discharged for fluctuation mitigation. The amount devoted to power trading can then be calculated as follows. For down trades, use the formulas 5-1 to 5-3. If it is an up trade, it is calculated by formulas 5-4 to 5-5. Since the W1 output value is the W1 lower limit, the W2 lower tradeable value (t2) is 0. Moreover, even if there is no electric power transaction, it is necessary to discharge from a storage battery for fluctuation reduction. The fluctuation relaxation discharge value also needs to be equal to or less than the storage battery dischargeable value Xd. When the fluctuation relaxation discharge value Zd is larger than the storage battery dischargeable value Xd, the W1 output value deviates from the fluctuation relaxation requirement.

W2 lower tradeable value (t2) = W2 lower tradeable value 1 (t2) = 0 (Formula 5-1)
Fluctuation discharge value Zd (t2) = MIN (W1 lower limit value (t2)-wind power generation predicted value Wf (t2), storage battery dischargeable value Xd (t2)) (Equation 5-2)
Charge value for fluctuation relaxation Zc (t2) = 0 (Expression 5-3)
W2 up tradeable value 1 (t2) = W1 upper limit value (t2)-W1 lower limit value (t2) ... (Form 5-4)
W2 up tradeable value = MIN (W2 up tradeable value 1 (t2), storage battery dischargeable value Xd (t2)-fluctuation relaxation discharge value Zd (t2)) (5-5 formula)
At time t3, since the wind power generation value exceeds the W1 upper limit value, the storage battery is charged for fluctuation mitigation. Therefore, if it is a down trade that is directed to power trading, it is calculated by formulas 6-4 to 6-5. If it is an up trade, it is calculated by formulas 6-1 to 6-3, and the W2 up tradeable value (t3) is zero.

W2 up tradeable value (t3) = W2 up tradeable value 1 (t3) = 0 (Expression 6-1)
Fluctuation discharge value Zd (t2) = 0 (Expression 6-2)
Fluctuation charge value Zc (t3) = MIN (Wind power generation prediction value Wf (t3)-W1 upper limit value (t3), storage battery chargeable value Xc (t3)) (6-3)
W2 lower tradeable value 1 (t3) = W1 upper limit value (t3)-W1 lower limit value (t3) (6-4)
W2 lower tradeable value = MIN (W2 lower tradeable value 1 (t3), storage battery dischargeable value Xc (t3)-fluctuation mitigation discharge value Zc (t3)) (6-5)

  Based on the above concept, the W2 up tradeable value and the W2 down tradeable value can be calculated by the following formulas at times t1, t2, and t3.

W2 lower tradeable value 1 (t) = MAX (0, wind power generation predicted value Wf (t)-W1 lower limit value (t)) (6-6)
W2 lower tradeable value = MIN (W2 lower tradeable value 1 (t), (battery chargeable value Xc (t)-fluctuation mitigation charge value Zc (t)) (6-7)
W2 tradeable value 1 (t) = MAX (0, W1 upper limit value (t)-wind power generation prediction value Wf (t)) (Expression 6-8)
W2 up tradeable value = MIN (W2 up tradeable value 1 (t), storage battery dischargeable value Xd (t)-fluctuation relaxation discharge value Zd (t)) ... (6-9 formula)

  The storage battery WF control calculation unit 6 calculates the storage battery charge / discharge command value, output upper limit command value, W1 output value, and W2 output value using the values calculated by the method described above. Details will be described with reference to FIG.

  FIG. 3 is a diagram for explaining the SOC of the storage battery system 3, the storage battery chargeable value Xc, and the storage battery dischargeable value Xd. The SOC can be discharged from the storage battery system 3 so that the SOC can be charged at or above the SOC discharge lower limit value, and the SOC can be charged within the range of the SOC at or below the SOC charge upper limit value. If the SOC is close to 100%, charging is not possible.

  FIG. 4 shows an operation flow of the renewable energy generator system 1000 with a storage battery. The storage battery WF control calculation unit 6 repeatedly performs the procedure 102 to the procedure 113 at predetermined intervals. In step 101, the repetition time is controlled. In step 102, the power transaction information receiving unit 4 receives the power transaction information P (t) via communication and outputs it to the storage battery WF control calculating unit 6.

Unless otherwise specified, Step 103 to Step 113 are processes performed by the storage battery WF control calculation unit 6. Based on the determination in step 103, it is determined whether the transaction is a raising transaction or a raising transaction. If P (t) is a positive value and the determination result is YES, the transaction is an increase transaction, and the output upper limit command value (maximum value of W0), W1, W2, and the storage battery charge / discharge command value in the increase transaction process of step 104 Is calculated. Details will be described with reference to FIG. If P (t) is a negative value and the determination result is NO, the transaction is a reduction transaction, and the output upper limit command value (maximum value of W0), W1, W2, and the storage battery charge / discharge command value in the reduction transaction process of step 105 Is calculated. Details will be described with reference to FIG.

  In step 106, command values are issued to the wind power generation facility 2, the storage battery system 3, and the BTB 8. BTB8 adjusts the power according to the W2 command value. The storage battery system 3 performs storage battery charge / discharge according to the storage battery charge / discharge command value, and the wind power generation facility 2 performs wind facility control according to the output upper limit command value.

  In step 107, the storage battery system 3 calculates the storage battery capacity SOC (t + 1) after charging / discharging and outputs it to the storage battery WF control calculation unit 6.

  In step 108, the wind power generation value prediction unit 5 receives weather information and calculates a wind power generation prediction value Wf (t + 1).

  The meteorological information is received at a timing different from the control interval. Here, the weather information is calculated from the latest meteorological information, the power generation actual value of the wind power generation value, and the power generation actual value of the wind power generation facility 2. The calculation method is not limited to a specific means (for example, the method described in the book “Short-term prediction of wind power output, Matthias Lange, Ulrich Focken, Ohmsha” can be used).

In step 109, W1 upper limit value (t + 1) and W1 lower limit value (t + 1) are calculated from the actual value of wind power generation value W1.
In step 110, the fluctuation relaxation discharge value Xd (t) and the fluctuation relaxation charge value Zc (t) are calculated. In step 111, a storage battery chargeable value Xc (t + 1) and a storage battery dischargeable value Xd (t + 1) are calculated from SOC (t + 1). In step 112, W2 up tradeable value 1 (t + 1) and W2 down tradeable value 1 (t + 1) are calculated using equations 6-6 and 6-8.

In step 113, the W2 increase tradeable value (t + 1) is calculated by Formula 6-7.
In step 114, the W2 lower tradeable value (t + 1) is calculated using equation 6-9.

  FIG. 5 is a diagram showing a detailed procedure of “upward transaction processing W0, W1, W2, and calculation of storage battery charge / discharge command value 104” of procedure 104 of FIG. 4 performed by storage battery WF control calculation unit 6.

  In step 1, it is determined whether P (t) is the W2 up tradeable value (t) defined by equation 6-9 or less. If YES, the P (t) request amount can supply P (t) as the W2 output value, so perform step 2. If NO, supply is impossible, so perform step 3.

In step 2, set as follows.
W2 = P (t)
W0 = Wind power generation predicted value Wf (t); Wind-like battery discharge value = P (t) + Discharge for fluctuation relaxation Xd (t)
W1 = W0 + P (t) + discharge value for fluctuation relaxation Xd (t)

  If the determination result in step 1 is NO, step 3 is performed. In step 3, set as follows. At time t3 in FIG. 3, the W2 increase tradeable value (t) is 0, and the storage battery only performs charging for fluctuation mitigation.

W2 = W2 tradeable value (t)
W0 = Wind power generation prediction value Wf (t); Wind
W1 = W0 + W2 tradeable value (t)
Battery charge / discharge value = W2 tradeable value (t) + fluctuation mitigation charge value Xc (t)

  FIG. 6 is a diagram showing a detailed procedure of “decrease transaction processing W0, W1, W2, calculate command value of storage battery charge / discharge 105” of procedure 105 of FIG. 4 performed by storage battery WF control calculation unit 6.

In step 1, it is determined whether Abs (P (t)) is less than or equal to the W2 lower tradeable value (t). Here, since the P (t) required amount is a negative value, the determination is made by comparing absolute amounts. If YES, the required amount of P (t) can be supplied, so perform step 2. If NO, supply is impossible, so perform step 3.
In step 2, set as follows.

W2 = P (t)
W0 = Wind power generation predicted value Wf (t); Wind-like battery charge value = Abs (P (t)) + Fluctuation charge value Xc (t)
W1 = W0 + P (t)-Fluctuation charge value Xc (t)

  On the other hand, if the determination result of step 1 is NO, step 3 is performed, and a setting is made to supply the maximum amount that can be supplied at time t, although the required amount P (t) is not satisfied. In step 3, set as follows. At time t2 in FIG. 3, the W2 lower tradeable value (t) is 0, and the storage battery only discharges for fluctuation relaxation.

W2 = −W2 lower tradeable value (t)
W0 = Wind power generation prediction value Wf (t)
W1 = W0-W2 lower tradeable value (t)-fluctuation relaxation discharge value Xd (t)
Storage battery charge value = W2 lower tradeable value (t) + fluctuation relaxation charge value Xc (t)

  By calculating W1 and W2 and the storage battery charge value according to the procedure described above, the power transaction power generation W2 and the output so that the total output of the generated power W0 and the charge / discharge value of the storage battery is within the range of the fluctuation mitigation requirements. There is an effect that the upper limit command value and the charge / discharge command value can be calculated.

  The first embodiment has been described above. Hereinafter, a partial alternative of the first embodiment will be described.

  In the first embodiment, a case has been described in which a prior power transaction contract is established and the P_MAX value is also determined. Instead, there will be described a case where there is no prior power transaction contract and the power is increased or decreased according to the approximately fixed amount P (t) when bidding on the power transaction market and executing the contract. In that case, the renewable energy generator system with a storage battery 1000 includes an I / F with an external power transaction bidding procedure and a power transaction processing unit that receives a contract result. After performing up to step 114 in FIG. 4, the storage battery WF control calculation unit 6 outputs the W2 lowered transaction possible value (t + 1) and the W2 increased transaction possible value (t + 1) to the power transaction processing unit. The power transaction processing unit receives a W2 lower tradeable value (t + 1) and a W2 higher tradeable value (t + 1), and performs a bid procedure for the power transaction market within the range. In the procedure 102 of FIG. 4, the power transaction processing unit receives P (t) as the execution result and outputs it to the power transaction information receiving unit 4.

  When bidding on a monthly or yearly basis, instead of the wind power forecast value Wf (t), the actual value of wind wind power generation in the past is used, and the tradeable value (t + 1), W2 P_MAX is calculated using the statistical value of the result of calculating the uptradable value (t + 1), and a bid is made. The statistical value may be an average value, and using a value having a cumulative probability of a% or more or less for n samples of past values has an effect of reducing the probability of a non-supplyable transaction to a% or less.

  As a partial alternative to the first embodiment, a device when it is necessary to maintain the output for a predetermined time or more after receiving P (t) in power trading will be described. For the function shown in FIG. 3, values that can be charged or discharged for a predetermined time according to the SOC are stored in the storage battery WF control calculation unit 6 as a storage battery chargeable value Xc (SOC) and a storage battery dischargeable value Xd (SOC). Hold. Using this function, the storage battery chargeable value Xc (SOC (t)) and the storage battery dischargeable value Xd (SOC (t)) that can maintain charging or discharging for a predetermined time or more are calculated, and the bid amount P_MAX is bid. If this is the case, power trading that satisfies the output maintenance conditions can be made.

MIN (ABS (chargeable battery charge value Xc (t)), W2 tradeable value 1 (t))> ABS (−P_MAX) (7 formulas)
MIN (storage battery chargeable value Xc (t), W2 lower tradeable value 1 (t))> P_MAX (8 formulas)

  As a partial alternative to the first embodiment, a case will be described in which the control is changed by determining which of power trading and fluctuation mitigation requirements is given priority. The storage battery WF control calculation unit 6 includes an arithmetic unit that executes the following processing. The storage battery WF control calculation unit 6 counts the number of times the power transaction cannot be supplied and the number of times deviating from the fluctuation mitigation requirements in a predetermined period. In addition, the index I is calculated by the following formula. If I is a negative value, the power transaction is prioritized, and the difference between the W1 upper limit value and the W1 lower limit value is set to a value larger than the initial value L. However, the initial value L is used for the number of deviations from the fluctuation mitigation requirement. If I is a positive value, the mode is to prioritize the fluctuation mitigation requirements, and the difference between the W1 upper limit value and the W1 lower limit value is set to the initial value L. K1 and K2 are preset values.

I = K1 * Number of times supply is not possible-K2 * Number of deviations from fluctuation mitigation requirements

  Thereby, the power transaction and the fluctuation mitigation requirement can be made compatible while dynamically changing the priority of the power transaction and the fluctuation mitigation requirement.

  In the above description of the first embodiment, the power transaction information P (t) is obtained at one time of the next timing and the storage battery and the WF are controlled. In the second embodiment, as a power transaction information, a power transaction prediction value Pf (t) at a plurality of times in the future is obtained, a future supply impossible situation is predicted and avoided, and more supplyable transactions are increased. A method will be described. The overall configuration is the same as that shown in FIG. 1, and the difference from the first embodiment is the internal processing of the power transaction information receiving unit 4 and the storage battery WF control calculating unit 6 in FIG. The power transaction information receiving unit 4 receives, as power transaction information, weather information, traffic information, and neighboring disaster information as information for calculating the power transaction predicted value Pf (t), and outputs it to the storage battery WF control calculation unit 6. . Also, the storage battery WF control calculation unit 6 receives the power transaction information and calculates a power transaction predicted value Pf (t). Moreover, the charge / discharge command value of the storage battery, the output upper limit command value, and the values of W1 and W2 are corrected from the predicted power transaction value Pf (t) and the predicted wind power generation value Wf (t). The correction method is performed by adding the procedure shown in FIG. 10 immediately before the procedure 106 in the procedure of FIG.

  Hereinafter, the concept of this procedure will be described with reference to FIGS. 7 to 9, and the detailed procedure will be described with reference to FIG. If the future power transaction predicted value Pf (t) of the power transaction information P (t) is known, the future supply impossible state can be known by inputting and simulating in the procedure of FIG. In addition, the control of the W1 output should be set to a state where the charging and discharging can be accommodated to the W2 output, or the storage battery system 3 is charged or discharged in the required amount so as not to fall into a supply impossible state. deep.

  FIG. 7 shows each output value and storage battery state when the regenerative energy generator system 1000 with storage battery is operated according to the procedure of FIG. 4 using the predicted power transaction value Pf (t) and the predicted wind power generation value Wf (t). Is shown. At time t2, even though Pf (t2) must be set to W2 output, Pf (t2)> W2 increase possible transaction value (t), and supply is impossible. As shown in Equation 6-9, if either of W2 increase tradeable value 1 (t) and storage battery dischargeable value Xd (t) becomes smaller than Pf (t2), this transaction becomes impossible.

  Fig. 8 shows that when Pf (t2)> W2 tradeable value 1 (t), the W1 output can be controlled and the discharge can be accommodated by the previous control so as not to fall into a supply impossible transaction. An example of keeping the state is shown. In FIG. 7, even if it is desired to increase the W1 output, the W1 upper limit value cannot be exceeded. Therefore, as shown in FIG. 8, it is effective to increase the W1 upper limit value at time t2 so that the W2 increase tradeable value 1 (t) can be obtained so that the W1 output can be increased. That is, the W1 upper limit value at the time t2 is set higher than the sum of the power transaction predicted value Pf (t2) and the wind power generation predicted value Wf (t2).

  To increase the W1 upper limit at time t2, set the W1 lower limit from the specified n minutes before time t2 (the fluctuation mitigation requirement is that the difference between the maximum and minimum values for n minutes is less than or equal to L). Determined as shown in Equation 9. If the W1 lower limit value is more than 9 formulas from n minutes ago, the W1 upper limit value (t2) at time t2 can be calculated as W1 lower limit value (t2) + L. t) can be set as the power transaction predicted value Pf (t), and can be supplied.

W1 lower limit (t) = predicted power transaction value Pf (t2) + predicted wind power generation value Wf (t2)-L (9)
W1 upper limit value (t) = predicted power transaction value Pf (t2) + predicted wind power generation value Wf (t2) (Equation 10)
However, t: t2-n to t2

  FIG. 9 shows an example in which the storage battery is charged by the previous control so as not to fall into a supply impossible transaction when Pf (t2)> storage battery dischargeable value Xd (t). As a result of the simulation using the power transaction predicted value Pf (t) and the wind power generation predicted value Wf (t), when the SOC value falls below the SOC lower limit value at a time earlier than t2 as shown in FIG. Before going to, lower the W1 output and charge the battery. If the occurrence of SOC shortage S (t2) is predicted and it is currently (t2-t0) seconds from t0 to time t2, shortage S (t2) is equally divided by this number of seconds and charged every second. The value S (tmp) is calculated, and this charge amount is added to the charge / discharge amount of the storage battery, and the storage battery charge / discharge amount and the W1 output value calculated up to step 113 in FIG. 4 are corrected. Here, the charge value S (tmp) is a negative value.

S (tmp) = S (t2) * Charge / discharge efficiency / (t2−t0) (11)
Storage battery charge / discharge value after correction = Storage battery charge / discharge value before correction + S (tmp) (12)
W1 output value after correction = W1 output value before correction + S (tmp) (13 formulas)

  As a result of the addition, when the storage battery charge / discharge value is smaller than the storage battery chargeable value Xc (t) (when compared with the absolute value), or when the W1 output value is smaller than the W1 lower limit value, the storage battery charge / discharge amount and the W1 output value Do not perform the correction. Here, even if it cannot be charged due to cancellation, at the next time t = t + 1, the absolute value of S (tmp) is calculated to be large by that amount, and the SOC at time t2 is increased by the shortage S (t2). The SOC lower limit can be exceeded.

  The correction of W0, W1, W2, and the storage battery charge / discharge command value using the power transaction predicted value Pf (t) based on the concept described in FIGS. 7 to 10 will be described with reference to FIG. This procedure is performed immediately before procedure 106 in FIG. Unless otherwise specified, each procedure is performed by the storage battery WF control calculation unit 6.

  In procedure 1, the storage battery WF control calculation unit 6 predicts power transaction prediction information Pf (t) for a future time t from the present to eight hours ahead. As a forecasting method, a probability distribution is created for each condition based on the history of what kind of power transaction information P (t) has existed according to conditions such as season, weather, time, air traffic information, and the presence or absence of nearby disasters. This can be realized by a method of obtaining a value with the highest probability under the condition of the desired time. Alternatively, the power transaction information receiving unit 4 may receive the power transaction prediction information Pf (t) predicted by other than the regenerative energy generator system 1000 with storage battery as power transaction information.

  In step 2, W1 output value, W2 output value, and SOC are simulated. That is, each output value when the regenerative energy generator system 1000 with storage battery is operated over the future time according to the procedure of FIG. 4 using the predicted power transaction value Pf (t) and the predicted wind power generation value Wf (t). And simulate the battery condition. The W1 predicted value (t) is a value calculated as a result of the procedure of FIG. 4 using the wind power generation predicted value Wf (t) as the wind power generation value. Also, in the case of non-suppliable transactions, if the SOC predicted value (t) is calculated as W2 predicted value (t) = Pf (t), the result is as shown in the example of the storage battery SOC value graph of FIG. become.

  In step 3, determine if there is a non-supplyable transaction period. As shown in FIG. 7, if there is a non-suppliable transaction and the maximum L (t2) is insufficient at time t2 and the shortage starts from time t1, the determination result is YES, and steps 4 to 9 are performed. Correct the value.

  If the result of step 3 is NO and there is no non-suppliable transaction, the command value calculated before step 113 in FIG.

  In step 4, if W2 tradeable value 1 (t2) <power transaction forecast information Pf (t2) at t2, (t2-t0) + α for the current time t0 and the time t2 when the shortage occurs If ≦ n, the W1 output value is corrected according to the concept described in FIG. That is, when the lower limit value of time t2 is before the time t2-n when the time t2 is determined, the lower limit value is set according to equation (9).

  In step 5, the SOC is simulated using the corrected W1 output value, and in step 6, the time and amount of SOC shortage are obtained.

  If the SOC is insufficient as a result of the procedure 6, the charge / discharge amount of the storage battery and the W1 output value are corrected in the procedure 7 in the manner described in FIG. When the storage battery charge / discharge amount is smaller than the storage battery chargeable value Xc (t) in steps 8 and 9, or when the W1 output value is smaller than the W1 lower limit value, Cancel correction of W1 output value. The former is a state in which the charge / discharge command value is incapable of operating the storage battery system, and the latter is because the W1 output value deviates from the fluctuation relaxation requirement.

  In the above, we have explained the case where it is impossible to increase power trading in the future, but if lower power trading is impossible to supply, similarly, lower the W1 upper limit in advance and set the SOC value in advance. If the W0, W1, W2, and storage battery charge / discharge command values are corrected so as to decrease, transactions that cannot be supplied can be avoided. That is, the W1 upper limit value is set to the W1 predicted value (t) from the time n before the non-supplyable transaction time by the following equation. Since this is a reduced power transaction, the power transaction predicted value Pf (t) is a negative value.

W1 upper limit value (t) = predicted power transaction value Pf (t2) + predicted wind power generation value Wf (t2) + L (13)
W1 lower limit value (t) = predicted power transaction value Pf (t2) + predicted wind power generation value Wf (t2) (Expression 14)
However, t: t2-n to t2

  As described above, in the second embodiment, the case where the power transaction prediction value Pf (t) at a plurality of times in the future is obtained as the power transaction information to perform more advanced control has been described. Hereinafter, partial alternatives will be described.

  FIG. 10 describes a method of correcting the W1 lower limit value in steps 4 to 9 when supply is impossible in a future raising transaction. As a first alternative, steps 4 to 9 are not performed, the W1 output value is lowered to the W1 lower limit value, and the storage battery system 3 is charged with the difference between the wind power generation value and the W1 lower limit value. By lowering the W1 output value to the W1 lower limit value, the difference between the W1 upper limit value and the W1 output value can be increased, that is, there is an effect of increasing the tradeable value for increasing W2 compared to the case where the control is not performed. Further, since the storage battery is charged during the period in which the W1 output value is lowered to the W1 lower limit value, there is an effect of increasing the dischargeable amount Xd as compared with the case where the control is not performed. Conversely, when supply becomes impossible in a future lowering transaction, the W1 output value is raised to the W1 upper limit value, and the difference between the W1 upper limit value and the wind power generation value is discharged from the storage battery system 3.

  As a second alternative, an explanation will be given for a case where it is unknown whether the transaction is an increase transaction or a decrease transaction, but it is found that P (ti) has a large absolute value at time ti. In the second embodiment, the method of controlling one of the W1 upper limit value (t) and the W1 lower limit value (t) on the assumption that the fluctuation mitigation requirement is that the difference between the maximum value and the minimum value for n minutes is L or less is described. A method of reducing the difference between the W1 upper limit value (t) and the W1 lower limit value (t) by combining them is effective for enabling supply in the power transaction P (t) having a large absolute value. In order to simplify the explanation, if the W1 output value for n minutes immediately before the time ti is constant, the W1 output value (ti) at the time ti will be the W1 output within the fluctuation mitigation requirements. It can be increased to value (ti-1) + L, and can be decreased to W1 output value (ti-1) -L. That is, the W2 up tradeable amount (ti) and the W2 down tradeable amount (ti) are L, and there is an effect that the maximum fluctuation frame of fluctuation relaxation can be used as the W2 output value.

  In order to perform this control, the storage battery WF control calculation unit 6 has the following calculation function. The average value of the predicted wind power generation value Wf (t) of tj to ti-1 between times tj and ti-1 is obtained from time tj that is n times or more before time ti, and this average is calculated so that charging and discharging are balanced. W1 upper limit value (t) and W1 lower limit value (t) are set above and below the value. Further, the W1 upper limit value (t) −W1 lower limit value (t) at that time is set to a value smaller than L.

  If the difference between the upper limit value (t) and the W1 lower limit value (t) is set to a value smaller than L, the wind power generation value deviates from this range, and charging / discharging of the storage battery system 3 is required. If the charge or discharge for that purpose has an error from the wind power generation value Wf (t) and it is biased toward the charge side or the discharge side, the predetermined storage battery charge rate is set to the storage battery charge rate. Charge or discharge the storage battery to raise or lower it within a certain range. By setting the ratio within a certain range, a change in the storage battery charging rate can be suppressed, and stable operation can be performed. The storage battery charge rate is the charge rate that needs to be charged little by little in order to compensate for the discharge even if the storage battery is not used.

  As a third alternative, a case where there is a delay of m seconds from the reception of P (t) to the output of the W2 output value will be described. This can be realized by using P (t−m) that has already been confirmed and received as the power transaction prediction information Pf (t) in the calculation in the storage battery WF control calculation unit 6. There is an effect of controlling using the value determined as the power transaction prediction information Pf (t). If there is a non-supplyable transaction at time t, there is an effect of making a supplyable transaction using the second embodiment and the above alternative. At this time, the storage battery WF control calculation unit 6 calculates each command value for the power transaction at the next time in the same manner as in the first embodiment, and executes it as it is if it can be supplied. When the supply is impossible, the operation is switched to the operation using P (t−m) that has already been confirmed and received as the power transaction prediction information Pf (t) by the method described in the second embodiment.

  FIG. 11 shows an example of the configuration of a renewable energy generator system 1000 with a storage battery according to the third embodiment. As an example of renewable energy, in addition to wind power generation, a configuration including solar power generation may be employed. In contrast to the configuration of the first embodiment illustrated in FIG. 1, the solar power generation facility 1 is provided, and the total power generation value of the solar power generation facility 1 and the wind power generation facility 2 is output to the power line 103.

  The regenerative energy generator system 1000 with storage battery outputs the total power generation value of the solar power generation facility 1 and the wind power generation facility 2 via the power line 101, and raises / lowers for system stabilization via the power line 102. Output / input transaction power. In order to measure each power, the power line 101 includes a power meter M1, and the power line 102 includes a power meter M2.

  Further, the fluctuation mitigation requirement in this case is that the total power generation value of the solar power generation facility 1 and the wind power generation facility 2 does not exceed the interconnection authorization amount as shown in FIG. The power value that can be used for power trading at each time in this case can be explained as follows.

  At time t1, the storage battery is not used to comply with the interconnection requirements. At this timing, the charge / discharge capacity of the storage battery is calculated by the following equation. The total predicted value of the wind power generation value and the solar power generation value without output suppression is defined as a power generation prediction amount Wf (t).

W2 increase tradeable value = MIN (interconnection authorization amount-power generation prediction amount Wf (t)), storage battery dischargeable value Xd (t)) (15)
W2 lower tradeable value = predicted power generation amount Wf (t) + storage battery chargeable value Xc (t) (16)

 At time t2, since the total output of the wind power generation value and the solar power generation value exceeds the interconnection authorization amount, the excess amount is charged by the storage battery.

W2 tradeable value = 0
W2 lower tradeable value = predicted power generation amount Wf (t) + (storage battery chargeable value Xc (t)-storage battery charge value (t2) (Equation 17)

  In the case of a W2 reduction transaction, if one of the photovoltaic power generation facility 1 and the wind power generation facility 2 is to be suppressed, suppressing the lower unit price of power generation has the effect of increasing sales. Alternatively, if the solar power generation facility 1 is preferentially suppressed, the number of times of suppression of the wind power generation facility 2 can be reduced, and there is an effect of preventing mechanical damage.

  In Example 3, the example of the combination of the photovoltaic power generation facility 1 and the wind power generation facility 2 has been described as an example of the renewable energy, but only the photovoltaic power generation, only the hydroelectric power generation, or only the bio power generation may be used. But you can. When combining, even if it has a gas turbine etc., it can do similarly.

  An example of a configuration of a renewable energy generator system 1000 with a storage battery according to the fourth embodiment is shown in FIG. The wind power generation facility 2 includes a meter M0 that measures a power generation value. When the meter M1 fails, there is an effect that the measured value of the meter M1 can be estimated from the sum of the charge / discharge value and the measured value of the meter M0, and can be used as the W1 output value.

  A regenerative energy generator system 3000 with a storage battery according to a fifth embodiment will be described with reference to FIGS. Although Examples 1-4 demonstrated the power transaction by the wind power generation equipment 2 of one site, this Example demonstrates the power transaction by the wind power generation equipment 2 of a plurality of sites. Even if the W2 up tradeable value or the W2 down tradeable value becomes 0 at one site alone and power trading is not possible, obtain a value of 0 or more by supplying adjustment power across multiple sites in different wind conditions It has the effect of being able to trade electricity.

  FIG. 14 shows an overall configuration of a renewable energy generator system 3000 including a plurality of wind power generation sites. Each site of the generator systems 2001 and 2002 and a command center 300 that outputs command information to each site. Become. The center 300 receives storage battery capacity information from each site together with the site ID, calculates a command value for each site, and outputs the command value together with the site ID to each site. Details will be described later.

  FIG. 15 is a configuration diagram of each site of the generator systems 2001 and 2002. The W1, W2 command unit 21 of FIG. 15 receives command information paired with the ID number of its own site from the center 300, the storage battery system 3 is charged with the charge / discharge command of the storage battery, the wind power generation facility 2 is set with the output upper limit command value, Output W1 output value and W2 output value to BTB8. The storage battery WF control estimation unit 6 receives the past measurement value from the meter M1, receives the SOC from the storage battery system 3, and reduces the W2 tradeable value 1 (t), the storage battery chargeable value Xc (t ), W2 tradeable value 1 (t), storage battery dischargeable value Xd (t) is calculated, and the ID number of its own site is attached to the center 300 as storage battery remaining power information. The other components having the same numbers as in FIG. 1 are the same as those in the first or second embodiment.

  In the center 300 shown in FIG. 15, the power transaction information receiving unit 4 receives the power transaction information and outputs it to the storage battery WF control estimation unit 302. The surplus power calculation unit 301 receives W2 lower tradeable value 1 (WF_ID, t), storage battery chargeable value Xc (WF_ID, t) received from each site, W2 higher tradeable value 1 (WF_ID, t), storage battery dischargeable value Xd The W2 down tradeable value (t) and W2 up tradeable value (t) of the site total are calculated from (WF_ID, t), and output to the storage battery WF control estimation unit 302. The calculation method will be described later with reference to FIG. The storage battery WF control calculation unit 302 calculates the total value of the W2 output value of each site using the power transaction information and the accumulated storage battery remaining power, and outputs the total value to the WF distribution determination unit 303. If the transaction is a supplyable transaction at time t, the total value of the W2 output values at each site at time t is assumed to be power transaction information Pf (t). The WF distribution determination unit 303 receives the total value of the W2 output value of each site, and can trade with a W2 lower tradeable value 1 (WF_ID, t), a storage battery chargeable value Xc (WF_ID, t), W2 up at each site. Determine W2 output value, W1 output value, W0 output value, and storage battery charge / discharge amount for each site within the range of value 1 (WF_ID, t) and storage battery dischargeable value Xd (WF_ID, t), and output to each site .

FIG. 16 is a diagram illustrating an operation flow of the center 300 in FIG. The storage battery WF control calculation unit 302 repeatedly performs the procedure 102 to the procedure 113 at a predetermined interval. In step 101, the storage battery WF control calculation unit 302 controls the repetition time. In step 102, the power transaction information reception unit 4 receives the power transaction information P (t) and outputs it to the storage battery WF control calculation unit 302.
Based on the determination in step 103, the surplus power counting unit 301 determines whether the transaction is an increase transaction or an increase transaction.
If P (t) is a positive value and the determination result in step 103 is YES, the transaction is an increase transaction, and in step 104, the surplus power counting unit 301 calculates the increase transaction possible amount. First, the increase transaction possible amount (WF_ID, t) of each site is set to the smaller value of W2 increase transaction possible value 1 (WF_ID, t) and storage battery discharge possible value Xd (WF_ID, t). Thereafter, the uptracing volume (WF_ID, t) of each site is totaled to calculate the uptracing volume (t) for the entire site.

  Receiving the value, storage battery WF control calculation unit 302 calculates W0, W1, W2, and storage battery charge / discharge command values for the entire site in step 105. Details are the same as the method described in FIG. In step 105, a determination flag indicating whether the transaction can be supplied is set. After that, in step 108, the WF distribution determination unit 303 increases W0, W1, W2 and W2 reduction possible transaction value 1 (WF_ID, t), storage battery chargeable value Xc (WF_ID, t), W2 for each site. Receivable value 1 (WF_ID, t) and storage battery dischargeable value Xd (WF_ID, t) are input, W2 output value (WF_ID, t) and storage battery discharge value Yd (WF_ID, t) are calculated, and each site Send to. Details of the procedure 108 will be described later.

  If P (t) is a negative value and the judgment result in step 103 is NO, the transaction is a reduction transaction.In step 106, the surplus calculation unit determines the reduction transaction possible amount (WF_ID, t) of each site and the entire site. Calculate the tradeable amount (t). The calculation method is the same as the procedure 104. In response to the calculation result of procedure 106, storage battery WF control calculation unit 302 calculates command values for W0, W1, W2, and storage battery charge / discharge for the entire site in procedure 105. Details are the same as the method described in FIG. In addition, a determination flag as to whether the transaction can be supplied is set. Thereafter, the WF distribution determination unit 303 calculates the W2 output value (WF_ID, t) and the storage battery discharge value Yd (WF_ID, t) from W0, W1, and W2 in the entire site in step 109, and transmits them to each site. . This can be similarly performed by replacing the procedure 108 described below with charge and discharge.

  Hereinafter, the procedure 108 will be described. In step 110, the WF distribution determination unit 303 determines a determination flag indicating whether the transaction is a supplyable transaction set in step 104 or step 105.

  If the determination result in step 110 is YES, in step 111, commands for each site are set. The W2 output value is calculated according to equation 18. By distributing to each WF site by this method, the W2 output value (WF_ID, t) can be assigned to a site with a larger capacity for power trading.

W2 output value (WF_ID, t) = P (t) * W2 up tradeable value (WF_ID, t) / W2 up tradeable value (t) ... (18 formulas)

If the determination result in step 110 is NO, in step 120, the command of each site is set as the upper limit of transaction possible amount of each site.
W2 output value (WF_ID, t) = W2 tradeable value (WF_ID, t)
In step 112, storage battery WF control calculation unit 302 sets storage battery discharge value Yd (WF_ID, t).
Battery discharge value Yd (WF_ID, t) = W2 output value (WF_ID, t)
Thereafter, in step 113, the storage battery discharge value xd (WF_ID, t) and the W2 output value (WF_ID, t) are transmitted to each WF.

  FIG. 17 is a diagram for explaining the operation flow of each WF site 200 of FIG. 14 or FIG. The W1, W2 command unit 21 receives the storage battery discharge value xd (WF_ID, t) and the W2 output value (WF_ID, t) in step 101. In step 101, the W1, W2 command unit 21 in FIG. Command values are output to the power generation facility 2, the storage battery system 3, and the BTB8. BTB8 adjusts the power according to the distribution amounts W1 and W2. The storage battery system 3 performs storage battery charge / discharge according to the storage battery charge / discharge command value, and the wind power generation facility 2 performs wind facility control according to the command value of W0.

  In step 102, the storage battery WF control estimation unit 6 obtains the storage battery capacity SOC (t + 1) as a charge / discharge result from the storage battery system 3. In step 103, the rechargeable battery chargeable value Xc (t + 1) and the rechargeable battery dischargeable value Xd (t + 1) are calculated from the SOC (t + 1).

  In step 104, the wind power generation value prediction unit 5 receives weather information and predicts the wind power generation value Wf (t + 1). The storage battery WF control estimation unit 6 calculates the W1 upper limit value (t + 1) and the W1 lower limit value (t + 1) from the past value of the wind power generation value W1 in step 105, and in step 108, the W2 lowering transaction The possible value 1 (t + 1) and the W2 up tradeable value 1 (t + 1) are calculated. These three types are performed by the method described in FIG.

In step 109, the storage battery WF control estimation unit 6 calculates the storage battery chargeable value Xc (t + 1), the storage battery dischargeable value Xd (t + 1), the W2 up-transactionable value 1 (t + 1),
W2 lower transaction possible value 1 (t + 1) and WF_ID of own site are transmitted to the center 300.

  Hereinafter, partial alternatives of the present embodiment will be described. The method of distributing the W2 output of the entire site to each site described in the procedure 111 of FIG. 16 has an effect that the W2 output value (WF_ID, t) can be assigned to a site with a larger capacity for power trading. There are other methods, though. For example, the sites are ordered in descending order of surplus power (W2 up tradeable value (WF_ID, t) for up trades, W2 down tradeable value (WF_ID, t) for down trades), and the W2 output of the entire site according to the order All of the remaining power of each WF until the value reaches the required amount of P (t) may be set as the W2 output value. By assigning a large amount to sites with a large surplus capacity, even if the actual power deviates from the prediction by the wind power forecasting unit 5, there are few W2 outputs allocated to sites with a small surplus capacity, so the storage battery can be used to satisfy the fluctuation mitigation requirements. Charge / discharge power can be used.

1000, 2000, 2001, 2002 Renewable energy generator system with storage battery 1 Solar power generation facility 2 Wind power generation facility 3 Storage battery system 4 Power transaction information receiving unit 5 Wind power generation value prediction unit 6 Storage battery control calculation unit 7 W1, W2 calculation unit 8 Power converter (BTB)
9 Electricity meter M0
10 Electric power meter M1
11 Electric power meter M2
12 Power Converter 13 Power Converter 14 Power Converter 15 Transformer 16 Transformer 200 Control Unit 300 Center

Claims (12)

Renewable energy generator that receives an output upper limit command value and outputs generated electric power below the output upper limit command value, a storage battery system that charges / discharges a storage battery according to a charge / discharge command value, the output upper limit command value, and the charge / discharge command A regenerative energy generator system with a storage battery comprising a control unit for outputting a value,
The storage battery system outputs the SOC value of the storage battery,
The control unit includes a renewable energy power generation prediction unit that predicts a renewable energy power generation possible value that can be generated by the renewable energy generator, a power transaction information reception unit that receives power transaction information, and the output upper limit command value And a storage battery WF control calculation unit for calculating the charge / discharge command value,
The storage battery WF control calculation unit, from the renewable energy power generation possible value, the power transaction information, the SOC value, fluctuation relaxation requirements, the generated power of the renewable energy generator, the charge / discharge command value of the storage battery, Calculate power trading power generation W2,
A power converter that distributes the power transaction power generation W2 by subtracting the power transaction power generation W2 from the total value W1 of the power generation value of the renewable energy generator and the charge / discharge command value, and the total value W1 A regenerative energy generator system with a storage battery, comprising: a first power meter 1 for measuring; and a second power meter 2 for measuring the power transaction power generation W2. In the regenerative energy generator system with storage battery according to claim 1,
The renewable energy generator system with a storage battery, wherein the renewable energy generator is a wind generator, a solar generator, a hydroelectric generator, a biomass generator, or a combination thereof. In the regenerative energy generator system with storage battery according to claim 1,
The storage battery WF control calculation unit
Calculate the chargeable power and dischargeable power of the storage battery from the SOC value, calculate the upper limit value of the total value W1 and the lower limit value of the total value W1,
When the power transaction information is a raising transaction, a dischargeable value is calculated from the SOC value, a difference between the upper limit value and the combined value W1 is calculated, and the dischargeable value and the difference is less than the small value. Set the charge / discharge command value,
When the power transaction information is a reduction transaction, a chargeable value is calculated from the SOC value, a difference between the total value W1 and the lower limit value is calculated, and an absolute value of the chargeable value and an absolute value of the difference An absolute value of the charge / discharge command value is set to a value less than a small value. In the renewable energy generator system with storage battery according to claim 3,
The storage battery WF control calculation unit uses the future value of the power transaction information to calculate a time when the power transaction power generation W2 is less than the power transaction information and an insufficient power value. If the charge / discharge command value is corrected to the charge side at the time before the time and is insufficient in the lowering transaction, the charge / discharge command value is corrected in a direction to decrease the total value W1 at the time before the time, or Regenerative energy generator system with storage battery, which is corrected to the discharge side. In the renewable energy generator system with storage battery according to claim 3,
The storage battery WF control calculation unit calculates the time when the power transaction power generation W2 is less than the power transaction information and the insufficient power value using the predicted value of the power transaction information. When the charge / discharge command value is corrected so that the total value W1 is set as the upper limit value at the time before the time, and the shortage transaction is insufficient, the total value W1 is set as the lower limit value at the time before the time. A rechargeable energy generator system with storage battery, wherein the charge / discharge command value is corrected. In the regenerative energy generator system with storage battery according to claim 1,
There are a plurality of the renewable energy generators and the storage battery system in pairs,
The renewable energy power generation prediction unit predicts a renewable energy power generation possible value of the plurality of renewable energy generators and outputs the predicted value to the storage battery WF control calculation unit, and the plurality of storage battery system SOC values from the SOC value of the plurality of storage battery systems A means for estimating a storage battery WF control to calculate a chargeable / dischargeable value of the storage battery system and output to the storage battery WF control calculation unit;
The storage battery WF control calculation unit is configured to calculate the charge / discharge values of the plurality of storage battery systems and the plurality of storage battery systems from the chargeable / dischargeable values of the plurality of storage battery systems and the renewable energy power generation possible values of the plurality of renewable energy generators. A renewable energy generator system with a storage battery, characterized by comprising means for determining a power generation value of a renewable energy generator and the power transaction power generation W2. Renewable energy generator system with storage battery according to claim 6,
The storage battery WF control calculation unit is configured to calculate the plurality of storage battery systems and the plurality of renewable energy power generations from the chargeable / dischargeable values of the plurality of storage battery systems and the renewable energy power generation possible values of the plurality of renewable energy generators. Calculate an individual power transaction power generation W2 possible value that is the power transaction power generation W2 for each pair of machines, calculate an aggregate value of the individual power transaction power generation W2 possible value, and calculate the power transaction power generation W2 from the aggregateable value And determining charge / discharge values of the plurality of storage battery systems, power generation values of the plurality of renewable energy generators, and the power transaction power generation W2 using the power transaction power generation W2 and the individual power transaction power generation W2 possible value. Renewable energy generator system with storage battery. In the regenerative energy generator system with storage battery according to claim 1,
A power meter 2 for measuring the power transaction power generation W2, and a power meter 0 for measuring an output value W0 of the renewable energy generator,
The regenerative energy generator system with storage battery, wherein the storage battery WF control calculation unit estimates power W1 from the power meter 2 and the power meter 0. The renewable energy generator system with a storage battery according to claim 2,
The renewable energy generator comprises a combination of a solar generator and other renewable energy generators,
The regenerative energy generator system with storage battery, wherein the storage battery WF control calculation unit preferentially suppresses the solar power generation. The renewable energy generator system with a storage battery according to claim 2,
The renewable energy generator comprises a combination of a wind generator and other renewable energy generators,
The regenerative energy generator system with storage battery, wherein the storage battery WF control calculation unit preferentially suppresses the wind power generation. In the renewable energy generator system with storage battery according to claim 3,
The storage battery WF control calculation unit calculates a fluctuation mitigation compliance rate in which the total value W1 is less than or equal to the upper limit value and greater than or equal to the lower limit value, and the suppliable transaction in which the power transaction power generation W2 supplies power of the transaction information A regenerative energy generator with storage battery, wherein the upper limit value and the lower limit value are corrected when an index calculated from the fluctuation mitigation compliance rate and the supplyable transaction rate exceeds a standard system. In the renewable energy generator system with storage battery according to claim 3,
The storage battery WF control calculation unit includes a display and a storage unit,
The storage unit stores a history of any one of the SOC value, the total value W1, power transaction information, the power transaction power generation W2, and the charge / discharge command value, and displays the history on the display unit. Adjacent renewable energy generator system.

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