JP2013150473A - System, device and program for controlling supply and demand for power system - Google Patents

System, device and program for controlling supply and demand for power system Download PDF

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JP2013150473A
JP2013150473A JP2012009983A JP2012009983A JP2013150473A JP 2013150473 A JP2013150473 A JP 2013150473A JP 2012009983 A JP2012009983 A JP 2012009983A JP 2012009983 A JP2012009983 A JP 2012009983A JP 2013150473 A JP2013150473 A JP 2013150473A
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battery
generator
charge
discharge
unit
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Mari Tanaka
真理 田中
Takenori Kobayashi
武則 小林
Koji Toba
廣次 鳥羽
motoki Kitani
元紀 木谷
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Toshiba Corp
株式会社東芝
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/14District level solutions, i.e. local energy networks

Abstract

PROBLEM TO BE SOLVED: To provide a system for controlling supply and demand for a power system, capable of obtaining more fuel cost reduction efficiency of a power generator by a secondary battery.SOLUTION: A system for controlling supply and demand for a power system, includes: a secondary battery; at least one of a power generator, a wind power generator and a photovoltaic power generator; and a device for controlling supply and demand for the power system. The device for controlling supply and demand calculates a discharge threshold and a charge threshold on the basis of a discharge unit price and charge and discharge efficiency of the secondary battery. The device calculates respective output distributions of the power generator and the secondary battery so that the secondary battery is discharged when an incremental fuel cost of the power generator is higher than the discharge threshold, and the secondary battery is charged when the incremental fuel cost of the power generator is lower than the charge threshold. The device calculates a plurality of charge and discharge thresholds by referring to operation result data, and changes the charge and discharge threshold on the basis of a predetermined condition.

Description

  The present embodiment relates to a power supply / demand control technique for a power system.

  Supply and demand operations of the power system can be broadly divided into supply and demand planning and supply and demand control. The supply and demand plan calculates an economical operation plan for the next day's generator based on the result of demand forecast. Supply and demand control is performed so that the output of the generator follows the demand fluctuation on the day. There are two types of supply and demand control: economic load distribution control corresponding to a relatively long cycle variation and frequency control corresponding to a short cycle variation. Economic load distribution control performs economical generator output control in response to fluctuations, and frequency control performs generator output control to maintain the frequency constant.

  The role of secondary batteries in supply and demand planning and supply and demand control can be broadly divided into economic improvement and frequency fluctuation suppression by load leveling. Regarding load leveling, optimization is performed at the stage of supply and demand planning. The supply and demand plan that includes secondary batteries is a power generation plan that operates a generator with high power generation efficiency at a more efficient operating point and stops a generator with low power generation efficiency by charging and discharging the secondary battery. Is. Regarding frequency fluctuation suppression, the speed of response of the secondary battery is utilized to suppress load fluctuation and natural energy output fluctuation that cannot be followed by the generator during frequency control. Regarding the improvement of economy by load leveling by the secondary battery, optimization is performed at the stage of supply and demand planning, and planned operation is performed at the stage of supply and demand control.

JP 2006-94649 A JP 2001-37085 A JP 2011-50133 A

  However, even in the case of economic load distribution control, there is room for further improving the economic efficiency by further reducing the fuel cost of the generator by actively operating the secondary battery from the economical viewpoint. On the other hand, in small-scale power systems called smart grids, microgrids, etc., the introduction of renewable energy power generation such as solar power and wind power is expected to continue in the future. The introduction of secondary batteries is indispensable in order to suppress the influence of fluctuations in the output of renewable energy power generation on the power system. However, since the introduction cost of the secondary battery is high, there is a need to obtain the maximum effect of introducing the secondary battery by effectively using the secondary battery.

  The present invention relates to economic load distribution control corresponding to fluctuations in a relatively long cycle in supply and demand control, by positively operating the secondary battery from the viewpoint of economy, that is, the economic effect of the secondary battery, that is, the secondary battery. It is an object of the present invention to provide a power supply / demand control system, a supply / demand control apparatus, and a supply / demand control program that can obtain more effects of reducing the fuel cost of a generator.

  According to the embodiment, a power supply and demand control system includes a secondary battery, at least one of a generator, a wind power generator, and a solar power generator, and a power supply and demand control apparatus. The supply and demand control device includes a data detection unit, a frequency control unit, an economic load distribution unit, a target command value creation unit, and an operation result data storage unit. The data detection unit detects system information of the power system. The frequency control unit calculates a regional requirement amount for each of the generator and the secondary battery based on the system information detected by the data detection unit. The economic load distribution unit calculates an output distribution of each of the generator and the secondary battery. The target command value creation unit is configured to each of the generator and the secondary battery based on the regional requirement amount calculated by the frequency control unit and the output distribution calculated by the economic load distribution unit. Target command values are generated, and the generated target command values are output to the corresponding generator and the secondary battery. The operation result data storage unit stores past operation results. The economic load distribution unit calculates a discharge threshold value and a charge threshold value based on a discharge unit price and charge / discharge efficiency of the secondary battery, and if the incremental fuel cost of the generator is higher than the discharge threshold value, the secondary battery is It is assumed that when the incremental fuel cost of the generator is lower than the charging threshold, the secondary battery is charged, and the output distribution of the generator and the secondary battery is calculated. Then, a plurality of charge / discharge threshold values are obtained with reference to the operation result data, and the charge / discharge threshold values are changed based on a predetermined condition.

The block diagram which shows the structure of the demand control system of the electric power grid | system which concerns on 1st Embodiment. 6 is a flowchart showing processing contents of an economic load distribution unit according to the first embodiment. The figure which shows the relationship between the charging / discharging threshold value 1 calculated in the economical load distribution part which concerns on 1st Embodiment, and the incremental fuel cost (lambda) of a generator, and the relationship between a secondary battery output and the amount of electrical storage. The figure which shows the relationship between the charging / discharging threshold value 1 calculated by the economic load distribution part which concerns on 1st Embodiment, the charging / discharging threshold value 2, and the incremental fuel cost (lambda) of a generator, and a secondary battery output, and the amount of electrical storage.

  Hereinafter, embodiments will be specifically described with reference to the drawings. The embodiment is realized by controlling a computer including a peripheral device with a program. In this case, various implementations of hardware and programs can be changed, such as a power supply / demand control system, a supply / demand control device, a supply / demand It can also be grasped as a control method, a supply and demand control program, and a computer-readable medium recording the program.

(First embodiment)
(Constitution)
FIG. 1 is a configuration diagram illustrating a power supply and demand control system according to the first embodiment. The supply and demand control system includes a power system 1, a computer (power system supply and demand control device) 2, and an MMI (man machine interface) 5. The power system 1 is called a smart grid or a microgrid, for example. Inside the electric power system 1, at least one of a plurality of generators G1, G2,..., Gn, a solar power generation device PV, and a wind power generation device WP, and a secondary battery BT are provided. The power system 1 is interconnected with the other system 3 via the interconnecting line 4. The power system 1 may be configured as an independent system that is not linked to other systems. In addition, a data detection unit 10 is provided inside the power system 1. The data detection unit 10 detects system information (such as information on the amount of power generation) in the power system 1 from the power system 1.

  .., 21n, 21BT, economic load distribution unit 22, online predicted demand and natural energy prediction output unit 23, previous day operation plan unit 24, frequency control unit 25, operation A record data storage unit 26 is provided. The computer 2 is connected to the power system 1 via the MMI 5. Each of the generators G1, G2,..., Gn and the secondary battery BT is connected to a target command value creation unit 211, 212,... In the computer 2 via a detection signal line 11 and a control signal line 12. -It is connected to 21n and 21BT, respectively.

(Operation of computer 2)
The economic load distribution unit 22 receives the predicted demand and natural energy predicted output output from the online predicted demand and natural energy predicted output unit 23, and the previous day operation plan output from the previous day operation plan unit 24. The predicted demand and the natural energy predicted output are information predicted based on the weather conditions of the day (conditions for each time such as sunshine, wind power, and wind direction), and are the online predicted demand and natural energy predicted output unit 23 via the Internet. Is obtainable information. The previous day operation plan is information relating to the previous day operation plan set by the previous day operation plan unit 24. The economic load distribution unit 22 refers to past operation result data stored in the operation result data storage unit 26. The driving performance data is information related to driving performance in the past (not limited to a specific day such as the previous day or the same day of the previous year, but also includes a monthly average).

  The economic load distribution unit 22 performs arithmetic processing to be described later based on the input predicted demand, natural energy predicted output, the previous day operation plan, and the operation result data to be referred to, and each generator G1, G2,. And the output distribution of each secondary battery BT is calculated. The economic load distribution unit 22 distributes the calculated output distribution of each of the generators G1, G2,..., Gn and the secondary battery BT to the corresponding target command value creation units 211, 212,. Output to 21BT. That is, the economic load distribution unit 22 controls the fluctuation component of long-term power supply and demand.

  Based on the system information detected by the data detection unit 10 via the signal line 13, the frequency control unit 25 determines the respective regional requirements (for each generator G1, G2,..., Gn and the secondary battery BT). AR) is calculated. The regional requirement amount (AR) is the difference between the total demand and the power generation amount in the power system 1, for example, using the frequency change amount (Δf) or the interconnected power flow change amount (ΔPt) obtained from the data detection unit 10. Can be calculated. The frequency control unit 25 calculates the calculated regional demand (AR) of each of the generators G1, G2,..., Gn and the secondary battery BT, and the corresponding target command value creation units 211, 212,. -Output to 21n, 21BT. That is, the frequency control unit 25 controls the fluctuation component of the short-term power supply and demand due to physical factors.

  The target command value creation units 211, 212,..., 21n, 21BT are based on the output distribution calculated by the economic load distribution unit 22 and the regional requirement amount (AR) calculated by the frequency control unit 25. Target command values for the generators G1, G2,..., Gn and the secondary battery BT are created. The target command value creation units 211, 212,..., 21n, 21BT connect the signal lines 12 to the generators G1, G2,..., Gn and the secondary batteries BT corresponding to the created target command values. , Output control of the corresponding generators G1, G2,..., Gn and the secondary battery BT is performed.

(Operation of economic load distribution unit 22)
FIG. 2 is a flowchart showing the processing operation of the economic load distribution unit 22 according to the first embodiment. First, the economic load distribution unit 22 uses the formula (1), the formula (2A), the formula (2B), the formula (3A), the formula (3B), the formula (4), and the formula (5) to obtain a secondary battery. BT charge threshold 1, discharge threshold 1, charge threshold 2, discharge threshold 2, and change conditions are calculated (Block 101). Hereinafter, charging and discharging may be collectively referred to as charging / discharging, and the charging threshold and discharging threshold may be collectively referred to as charging / discharging threshold. In order to obtain an economic effect by charging / discharging of the secondary battery BT, electric power charged at a certain unit price may be discharged at a higher unit price after considering a loss due to charging / discharging. Therefore, the economic load distribution unit 22 obtains the charge unit price and the discharge unit price of the secondary battery BT that satisfies Equation (1). Hereinafter, the unit price of charge and the unit price of discharge may be collectively referred to as a unit price of charge / discharge. The economic load distribution unit 22 calculates a charge / discharge threshold based on the charge / discharge unit price.

Charge unit price / η ≦ Discharge unit price (1)
η: Charging / discharging efficiency of the secondary battery BT The economic load distribution unit 22 calculates, for example, an average discharge unit price of the secondary battery BT in the previous day operation plan, and uses the equations (2A) and (2B) to obtain the secondary Based on the discharge unit price and the charge / discharge efficiency of the battery BT, the charge threshold value 1 and the discharge threshold value 1 of the secondary battery BT are calculated. That is, the economic load distribution unit 22 determines the calculated average discharge unit price as the discharge threshold value 1. Then, the economic load distribution unit 22 calculates the charging threshold 1 based on the determined discharging threshold 1 and the charging / discharging efficiency η of the secondary battery BT.

Discharge threshold 1 = average discharge unit price in the previous day operation plan (2A)
Charge threshold 1 = discharge threshold 1 × η (2B)
Next, the economic load distribution unit 22 selects a date on which the actual values of the demand and the natural energy output are similar to the predicted demand and the natural energy predicted output of the day from the operation result data stored in the operation result data storage unit 26. Select it as the data reference date. The data of the similar day is, for example, the data of the same month of the previous year, the data of the previous day, the average data of the month to which the day belongs. FIG. 3 is a graph of the relationship between the charge / discharge threshold value 1 calculated by the equations (2A) and (2B) and the actual value of the incremental fuel cost λ of the generator with respect to the time on the data reference date ((a) of FIG. 3). And FIG. 3B is a graph of the actual output amount value and the actual storage amount value of the secondary battery BT with respect to the time on the data reference date. Here, the incremental fuel cost λ is a value of an increase in fuel cost obtained by dividing the required power amount by the power generation amounts of the plurality of generators G1, G2,..., Gn. When the relationship between the charging / discharging threshold value 1 and the actual value of the incremental fuel cost λ is the graph shown in FIG. 3A, according to the graph shown in FIG. 3B, the charged amount of the secondary battery BT is zero. Therefore, even when the incremental fuel cost λ exceeds the discharge threshold value 1, a time zone in which the secondary battery BT does not operate occurs. In such a case, the economic load distribution unit 22 calculates the charging threshold value 2 and the discharging threshold value 2 of the secondary battery BT using the equations (3A) and (3B). That is, the economic load distribution unit 22 obtains a plurality of charge / discharge thresholds with reference to the operation result data.

Discharge threshold 2 = discharge threshold 1 × α (3A)
Charging threshold value 2 = Discharging threshold value 2 × η Expression (3B)
α: A positive predetermined value α> 1.0 set by the economic load distribution unit 22 with reference to the previous day or the nearest operation result data. Next, the economic load distribution unit 22 sets the charge / discharge threshold value of the secondary battery BT. The condition for changing from the charge / discharge threshold 1 to the charge / discharge threshold 2 is determined. Here, two examples of changing conditions are shown, but the changing conditions are not limited.

<Change condition 1>
Storage amount ≦ β, β ≧ 0 Formula (4)
⇒Change from charging / discharging threshold value 1 to charging / discharging threshold value 2 However, the storage amount except for 0 to 6 o'clock and 18 to 24 o'clock is the storage amount by the secondary battery BT output at the time of economic load distribution.
The change condition may be the following change condition 2.
<Change condition 2>
Incremental fuel cost of generator λ ≧ γ Equation (5)
⇒Change from charge / discharge threshold value 1 to charge / discharge threshold value 2 However, except for 0-6 o'clock and 18-24 o'clock, γ is a positive value set by the economic load distribution unit 22 with reference to the previous day or the nearest operation result data And

  Next, the economic load distribution unit 22 determines whether the change condition 1 or the change condition 2 determined in Block 101 is satisfied, and sets the charge / discharge threshold to the charge / discharge threshold 1 or charge / discharge threshold 2 (Block 102). That is, the economic load distribution unit 22 uses the change condition 1 or the change condition 2 to satisfy the condition that the storage amount of the secondary battery BT is equal to or less than a predetermined value according to the expression (4) or the expression (5). When the condition that the incremental fuel cost λ is equal to or greater than a predetermined value is satisfied, the charge / discharge threshold is changed from the charge / discharge threshold 1 to the charge / discharge threshold 2. That is, the economic load distribution unit 22 increases the discharge threshold in a direction in which the secondary battery BT is difficult to discharge (a direction in which discharge is avoided), and increases the charge threshold in a direction in which the secondary battery BT is easily charged. change.

  Therefore, the economic load distribution unit 22 does not discharge by changing to the charge / discharge threshold 2 even in the time zone in which the secondary battery BT is discharged if the charge / discharge threshold 1 remains unchanged. Can be controlled. Moreover, even if it is the time zone when the secondary battery BT is not operating with the charge / discharge threshold 1, the economic load distribution unit 22 is charged by the economic load distribution unit 22 by changing to the charge / discharge threshold 2. Can be controlled. Note that the economic load distribution unit 22 may set the charge / discharge threshold value to the charge / discharge threshold value 1 or the charge / discharge threshold value 2 using a combination of the change condition 1 and the change condition 2.

Next, the economic load distribution unit 22 calculates a generator shared demand (Block 103). That is, the economic load distribution unit 22 uses the predicted demand and natural energy predicted output input from the online predicted demand and natural energy predicted output unit 23 to generate generators G1, G2,. Calculate the share of demand. Note that the predicted natural energy output includes the predicted output of the solar power generation device PV (hereinafter referred to as PV predicted output) and the predicted output of the wind power generation device WP (hereinafter referred to as WP predicted output).
Generator share demand = forecast demand-(PV forecast output + WP forecast output) (6)
Next, the economic load distribution unit 22 determines the initial distribution (Block 104). That is, the economic load distribution unit 22 determines the output distribution as the initial distribution of the generator, assuming that the secondary battery BT is not charged / discharged with respect to the generator-sharing demand calculated in Block 103, and The incremental fuel cost λ for each generator is calculated. The economic load distribution unit 22 obtains the start / stop state of the generator from the operation plan 24 on the previous day. The economic load distribution unit 22 calculates the output distribution of the parallel generator based on, for example, the equal λ method based on the start / stop state of the generator. The equal λ method is a method that is generally used when economic load distribution of generators is performed. The economic load distribution unit 22 can also calculate the incremental fuel cost λ of each generator by using the equal λ method.

  Next, the economic load distribution unit 22 determines the secondary battery BT output (Block 105). That is, the economic load distribution unit 22 compares the charging / discharging threshold determined in Block 102 with the incremental fuel cost λ of the generator calculated in Block 103, and recharges the secondary battery BT using Equations (7A) to (7C). Determine the discharge.

Incremental fuel cost λ <charge threshold ⇒ charge secondary battery BT (7A)
Charging threshold ≤ Incremental fuel cost λ ≤ Discharging threshold ⇒ Do not charge / discharge secondary battery BT Formula (7B)
Discharge threshold <Incremental fuel cost λ ⇒ Discharge secondary battery BT Formula (7C)
That is, when the incremental fuel cost λ of the generator is lower than the charging threshold value of the secondary battery BT according to the equation (7A), the economic load distribution unit 22 determines “charge the secondary battery BT”. When the incremental fuel cost λ of the generator is between the charging threshold value and the discharging threshold value of the secondary battery BT according to the equation (7B), the economic load distribution unit 22 “does not charge or discharge the secondary battery BT” And decide. If the incremental fuel cost λ of the generator is higher than the discharge threshold value of the secondary battery BT, the economic load distribution unit 22 determines “discharge the secondary battery BT” according to the equation (4C).

The economic load distribution unit 22 has a range in which the sum of the charge / discharge output of the secondary battery BT and the planned charge / discharge output of the secondary battery by the previous day operation plan unit 24 does not exceed the kW capacity of the secondary battery, and It is determined in a range where the amount of electricity stored by the total value does not exceed the kWh capacity of the secondary battery. For example, in the case of discharge, the economic load distribution unit 22 may algebraically calculate a discharge output whose value does not fall below the discharge threshold because the incremental fuel cost λ of the generator is reduced by the discharge of the secondary battery BT. In addition, a guide value for discharging may be determined in advance. Similarly, in the case of charging, since the incremental fuel cost λ of the generator increases due to charging of the secondary battery BT, the economic load distribution unit 22 algebraically calculates a charging output whose value does not exceed the charging threshold. Alternatively, a reference value for charging may be determined in advance.
FIG. 4 is a graph ((a) of FIG. 4) of the relationship between the charge / discharge threshold value set in Block 102 with respect to time and the incremental fuel cost λ of the generator calculated in Block 104, and the output amount of the secondary battery BT with respect to time. It is a graph ((b) of FIG. 4) of the amount of electrical storage. The example shown in FIG. 4 is a case where change condition 1 is used and β = 0. In order to simplify the description, the demand on the day and the natural energy output are set to the same values as the actual values on the reference date shown in FIG. According to the graph shown in FIG. 4, the economic load distribution unit 22 controls the secondary battery BT to be charged since the incremental fuel cost λ is lower than the charging threshold 1 at 0-6 o'clock, and between 7-9 o'clock. Since there is a time when the discharge threshold value 1 is exceeded, the secondary battery BT is controlled to be discharged at that time. Since the secondary battery BT has a storage amount of zero before 9 o'clock, the economic load distribution unit 22 changes the charge / discharge threshold value from the charge / discharge threshold value 1 to the charge / discharge threshold value 2 according to the change condition 1. Therefore, according to the graph shown in FIG. 4B, the secondary battery BT is charged / discharged even between 9-18 o'clock, which was not operating in the operation results shown in FIG. You can see that

  Next, the economic load distribution unit 22 redistributes the output distribution as the initial distribution of each generator calculated in Block 104 based on the secondary battery BT output calculated in Block 105 (Block 106). In other words, the economic load distribution unit 22 creates a new power generation by subtracting the secondary battery output calculated in Block 105 (a positive value in the case of discharging, a negative value in the case of charging) from the generator-sharing demand calculated in Block 103. Redistribution is performed by determining the output distribution of the generators G1 to Gn again based on the new generator sharing demand. The economic load distribution unit 22 first performs the processing of Block 101, performs the processing from Block 102 to Block 106 each time according to the control cycle, and calculates the output distribution of the secondary battery BT and each of the generators G1 to Gn each time.

  According to the first embodiment, the economic operation by the secondary battery BT corresponding to the fluctuation of a relatively long period targeted by the economic load distribution control can be performed, so the economic effect by the secondary battery BT, that is, the secondary battery. It is possible to perform supply and demand control of the power system that can obtain more effects of reducing the fuel cost of the generator by BT.

(Second Embodiment)
Next, a second embodiment will be described. The configuration of the supply and demand control system according to the second embodiment is the same as that of the supply and demand control system according to the first embodiment shown in FIG. The operation of each part of the supply and demand control system may be the same as described in the first embodiment unless otherwise specified.

  The second embodiment differs from the first embodiment in the operation of the economic load distribution unit 22 in Block 101 of FIG. The second embodiment is a case where the secondary battery BT is operated from the viewpoint of supply reliability at the expense of economy when the operating reserve by the generators G1 to Gn and the secondary battery BT is insufficient. . The economic load distribution unit 22 does not consider the relationship of the formula (1) in Block 101, and changes the condition for changing from the charge / discharge threshold 1 to the charge / discharge threshold 2 using the change condition 3 or the formula (8B) according to the formula (8A). The condition 4 is determined, and the charge / discharge threshold value 2 is determined as Expression (9A) or Expression (9B). Note that the economic load distribution unit 22 uses the equations (8A) and (9A) when the lower side operation reserve is insufficient. The lower-side operating reserve is the amount of electric power that can reduce the amount of power generated by the generators G1 to Gn and the secondary battery BT as the operating reserve.

<Change condition 3>
Lowering side operation reserve <total demand x δ (8A)
⇒ Change from charge / discharge threshold 1 to charge / discharge threshold 2 δ: negative value <charge / discharge threshold 2>
Discharge threshold 2 = ε
Charging threshold 2 = ε (9A)
ε: A sufficiently small value for the incremental fuel cost λ. For example 0.0
When the economic load distribution unit 22 uses the equations (8A) and (9A), the relationship between the discharge threshold value and the incremental fuel cost λ in the block 105 is always “discharge threshold value <incremental fuel cost λ”. Therefore, the economic load distribution unit 22 controls the secondary battery BT to always be forcibly discharged by lowering the discharge threshold when the lower side operation reserve becomes equal to or less than a predetermined value. The side reserve can be increased.

  On the other hand, the economic load distribution unit 22 uses the equations (8B) and (9B) when the raising side operation reserve is insufficient. The increased driving reserve is the amount of electric power that can increase the amount of power generated by the generators G1 to Gn and the secondary battery BT as the operating reserve.

<Change condition 4>
Raised driving reserve <total demand x δ '(8B)
⇒ Change from charge / discharge threshold 1 to charge / discharge threshold 2 δ ′: positive value <charge / discharge threshold 2>
Discharge threshold 2 = ε ′
Charging threshold value 2 = ε ′ (9B)
ε ′: sufficiently large with respect to the incremental fuel cost λ. For example 100.0
When the economic load distribution unit 22 uses the equations (8B) and (9B), the relationship between the discharge threshold value and the incremental fuel cost λ in the block 105 is always “incremental fuel cost λ <charge threshold value”. Therefore, the economic load distribution unit 22 performs control so that the secondary battery BT is always forcibly charged by increasing the charging threshold when the raising-side operation reserve becomes equal to or less than a predetermined value. The side reserve can be increased.

  According to the second embodiment, in addition to the effects achieved in the first embodiment, the operating reserve can be increased when the operating reserve by each of the generators G1 to Gn and the secondary battery BT is insufficient. This can contribute to the improvement of the supply reliability in the electric power system 1.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Electric power system, 2 ... Computer, 3 ... Other system, 4 ... Interconnection line, 5 ... MMI, 10 ... Data detection part, 11, 12, 13 ... Signal line, 22 ... Economic load distribution part, 23 ... Online prediction Demand and natural energy prediction output unit, 24 ... previous day operation planning unit, 25 ... frequency control unit, 26 ... operation performance data storage unit, 211, 212, ..., 21n, 21BT ... target command value creation unit, G1, G2, ... , Gn: generator, BT: secondary battery, PV: solar power generation, WP: wind power generation.

Claims (12)

  1. A secondary battery,
    At least one of a generator, a wind generator and a solar generator;
    A power supply and demand control device connected to these,
    A power supply and demand control system having
    The supply and demand control device
    A data detection unit for detecting system information of the power system;
    Based on the system information detected by the data detection unit, the generator, a frequency control unit for calculating the respective regional requirement amount of the secondary battery,
    An economic load distribution unit that calculates an output distribution of each of the generator and the secondary battery;
    Based on the regional requirement amount calculated by the frequency control unit and the output distribution calculated by the economic load distribution unit, create a target command value for each of the generator and the secondary battery, The generator corresponding to each of the created target command values, a target command value creating unit that outputs to the secondary battery,
    An operation result data storage unit for storing past operation results;
    The economic load distribution unit calculates a discharge threshold value and a charge threshold value based on a discharge unit price and charge / discharge efficiency of the secondary battery, and if the incremental fuel cost of the generator is higher than the discharge threshold value, the secondary battery is It is assumed that when the incremental fuel cost of the generator is lower than the charging threshold, the secondary battery is charged, and the output distribution of the generator and the secondary battery is calculated. A power supply and demand control system that obtains a plurality of charge / discharge threshold values with reference to operation result data and changes the charge / discharge threshold values based on a predetermined condition.
  2.   The supply and demand control system according to claim 1, wherein the economic load distribution unit changes a charge / discharge threshold value when a storage amount of the secondary battery becomes equal to or less than a predetermined value.
  3.   The supply and demand control system according to claim 1, wherein the economic load distribution unit changes a charge / discharge threshold when the incremental fuel cost becomes equal to or greater than a predetermined value.
  4.   The economic load distribution unit forcibly discharges by lowering a discharge threshold when the lower side operation reserve by the generator and the secondary battery is equal to or lower than a predetermined value, and the generator and the The supply and demand control system according to claim 1, wherein when the raising-side driving reserve by the secondary battery is equal to or less than a predetermined value, the charging threshold is increased to forcibly charge the battery.
  5. A power supply and demand control device connected to a secondary battery and at least one of a generator, a wind power generator, and a solar power generator,
    A data detection unit for detecting system information of the power system;
    Based on the system information detected by the data detection unit, the generator, a frequency control unit for calculating the respective regional requirement amount of the secondary battery,
    An economic load distribution unit that calculates an output distribution of each of the generator and the secondary battery;
    Based on the regional requirement amount calculated by the frequency control unit and the output distribution calculated by the economic load distribution unit, create a target command value for each of the generator and the secondary battery, The generator corresponding to each of the created target command values, a target command value creating unit that outputs to the secondary battery,
    An operation result data storage unit for storing past operation results;
    The economic load distribution unit calculates a discharge threshold value and a charge threshold value based on a discharge unit price and charge / discharge efficiency of the secondary battery, and if the incremental fuel cost of the generator is higher than the discharge threshold value, the secondary battery is It is assumed that when the incremental fuel cost of the generator is lower than the charging threshold, the secondary battery is charged, and the output distribution of the generator and the secondary battery is calculated. A power supply / demand control apparatus that obtains a plurality of charge / discharge threshold values with reference to operation result data and changes the charge / discharge threshold values based on a predetermined condition.
  6.   The supply / demand control apparatus according to claim 5, wherein the economic load distribution unit changes a charge / discharge threshold value when a storage amount of the secondary battery becomes equal to or less than a predetermined value.
  7.   The supply and demand control apparatus according to claim 5, wherein the economic load distribution unit changes a charge / discharge threshold when the incremental fuel cost becomes equal to or greater than a predetermined value.
  8.   The economic load distribution unit forcibly discharges by lowering a discharge threshold when the lower side operation reserve by the generator and the secondary battery is equal to or lower than a predetermined value, and the generator and the The supply-and-demand control apparatus of Claim 5 which raises a charge threshold value and forcibly charges when the raising side driving | running reserve capacity by a secondary battery becomes below a predetermined value.
  9. A program executed by a supply and demand control device for a power system connected to a secondary battery and at least one of a generator, a wind power generator, and a solar power generator,
    The program is
    Detecting grid information of the power grid,
    Based on the grid information detected by the data detection unit, the generator and the respective regional requirements for the secondary battery are calculated,
    Calculate the output distribution of each of the generator and the secondary battery,
    Based on the regional requirement amount and the output distribution, the power generator generates a target command value for each of the secondary batteries, the power generator corresponding to each of the generated target command values, and the secondary Output to the battery,
    A discharge threshold value and a charge threshold value are calculated based on a discharge unit price and charge / discharge efficiency of the secondary battery, and the secondary battery is discharged when the incremental fuel cost of the generator is higher than the discharge threshold value. When the incremental fuel cost of the machine is lower than the charging threshold, the output distribution of each of the generator and the secondary battery is calculated as charging the secondary battery, and the operation result data is A power supply / demand control program for obtaining a plurality of charge / discharge threshold values by referring to the charge system and changing the charge / discharge threshold values based on a predetermined condition.
  10.   The supply / demand control program according to claim 9, wherein the charge / discharge threshold value is changed when a storage amount of the secondary battery becomes equal to or less than a predetermined value.
  11.   The supply and demand control program according to claim 9, wherein the charge / discharge threshold is changed when the incremental fuel cost is equal to or greater than a predetermined value.
  12.   When the lower side operation reserve by the generator and the secondary battery is equal to or lower than a predetermined value, the discharge threshold is lowered to forcibly discharge, and the up side operation by the generator and the secondary battery is performed. The supply and demand control program according to claim 9, wherein when the reserve capacity becomes equal to or less than a predetermined value, charging is forcibly performed by increasing a charging threshold value.
JP2012009983A 2012-01-20 2012-01-20 System, device and program for controlling supply and demand for power system Pending JP2013150473A (en)

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JP2015037371A (en) * 2013-08-14 2015-02-23 富士電機株式会社 Demand controller
WO2015145784A1 (en) * 2014-03-27 2015-10-01 Nec Corporation Energy management method and system for energy supply system
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