JP2006094648A - Power system control method and power system controller using secondary battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently control a power system by utilizing the capability of a secondary battery. <P>SOLUTION: An apparatus 30 uses the secondary battery 44 provided on the customer side for consuming power, connected to the power system 10 for supplying power to the customers and charged and discharged for a benefit of the customers, implements a load flow control and a system control of the power system 10, and is provided with an acquisition section 301 for acquiring a charging/discharging capability of the secondary battery 44 from the secondary battery 44, a determination section 302 for using the charging/discharging capability acquired by the acquisition section 301 and determining an operation schedule or the charging/discharging quantity of the secondary battery 44, and a control section 303 for controlling the secondary battery 44 based on the operation schedule or the charging/discharging quantity determined by the determination section 302. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power system control method and a power system control apparatus using a secondary battery that is provided on the consumer side and contributes to control of the power system.

  A secondary battery introduced by a consumer is controlled and operated on the consumer side in accordance with the purpose of introduction. Therefore, only the information on the customer premises is taken in, and the secondary battery is controlled based on the information to realize the introduction purpose. Therefore, in view of the capacity of the secondary battery, there is a possibility that it can sufficiently contribute to other purposes. The basic functions of the conventional secondary battery will be described below.

(1. Basic functions)
In general, an electricity price contract between an electric power company and a customer is contracted with a contract power that does not exceed the maximum demand of the customer throughout the year. On the other hand, if the power is received exceeding the maximum contract power, an additional fee is collected as a penalty. Therefore, when a consumer introduces a secondary battery to curb the electricity bill, the maximum power is suppressed so as not to exceed the contracted power so that an extra penalty is not collected, and load leveling is attempted. It is conceivable to reduce the contract power itself to make a cheap contract, and to sell the secondary battery power to the power company to make a profit.

(1.1 Function to control the maximum demand of consumers)
The customer contracts with the electric power company at a value (contract power) that exceeds the annual maximum demand (peak). When demand exceeds the contracted power, a penalty (extra charge) is collected from the power company.

In FIG. 29, the example of the daily demand curve in a consumer is shown. The consumer determines the contract power F with the power company so that the maximum demand D _max does not exceed the contract power throughout the year. However, as shown in FIG. 30, when the maximum demand _Dmax exceeds the contracted power F due to equipment enhancement or the like, a penalty (extra charge) is collected from the electric power company, so that the electricity charge increases. FIG. 31 shows a control method of the secondary battery. The control device 2 that controls the secondary battery 1 connected in parallel with the loads L1 to Ln takes in the power transmitted to the power receiving end 3 through the distribution system 5, performs comparison with the set reference power, When the secondary battery 1 is controlled with the operation schedule as shown in FIG. 32, the demand D can be controlled so as not to exceed the contract power F even in the same equipment situation as shown in FIG.

  However, as shown in FIG. 32, in general, the secondary battery 1 tends to discharge during a daytime high demand period, and as a whole, the energy held by the secondary battery 1 itself remains sufficiently. There are often.

(1.2 Customer load leveling function)
The customer contracts with the electric power company with the contract power F that exceeds the annual maximum demand (peak), but generally, the lower the contract power F, the lower the electricity bill. Therefore, if the maximum power can be reduced throughout the year, the contracted power F can be lowered to reduce the electricity bill. In addition, the electricity charges differ according to the time of day, and in general, the daytime is high and the nighttime is inexpensive. Therefore, even if the same electricity is used, it is possible to further reduce the electricity bill by using it at night and suppressing the use during the day.

In this case, the control device 2 shown in FIG. 31 starts charging at a time when the electricity charge becomes cheaper, stops charging at the time when the electricity charge becomes high, and detects the power of the power receiving end 3. By starting discharging when the set power is exceeded, the output of the secondary battery 1 is obtained as shown in FIG. 34, and load leveling can be realized even in the same equipment situation as shown in FIG. Thus, the contract power can be reduced from the old contract power F _old to the new contract power F _new and the daytime power can be suppressed.

  However, as shown in FIG. 34, the secondary battery 1 is generally not operating for a certain period of time, and the energy held by the secondary battery 1 itself remains. Moreover, although the output ratio characteristic with respect to the driving | running time of the secondary battery 1 is shown in FIG. 36, even if the secondary battery 1 is used with the driving | running pattern like FIG. It turns out that it can be used effectively.

(1.3 Power selling function for power suppliers)
The purpose of the consumer who introduces the secondary battery 1 is various in addition to the function of suppressing the maximum demand _Dmax and the load leveling function of the consumer. However, there are many cases where the original capacity of the secondary battery 1 as shown in FIGS. 32 and 36 is not used up.

  Therefore, in addition to the unused portion of the secondary battery 1 as shown in FIG. 37, the short-time high output capability of the secondary battery 1 as shown in FIG. It is thought that merit can be obtained.

(2. Basic power distribution facilities)
The power system is generally configured as shown in FIG. 38, and electricity is produced at power plants such as the hydroelectric power plant 17, the thermal power plant 16, and the nuclear power plant 18, and the transmission line 60, the substations 11-15, It is transported and distributed by the electric wire 27. And it is a distribution channel that is consumed by consumers.

(2.1 Features of the power system)
An electric power system is a system that converts heat energy and kinetic energy into electric energy, and transports, distributes, and consumes it. Unlike other energy supply systems, electric energy cannot be stored, so changes in consumption. Therefore, it is necessary to control the production volume so as to match both the quantity and time.

  Electricity is indispensable in social activities and production activities. The power system that produces, transports, distributes and consumes this electricity has less frequency fluctuations, less voltage fluctuations, and fewer power outages. There is a social mission to supply high-quality electricity economically. In order to fulfill this mission, it is important to control the individual power components, substations, distribution systems, and other individual components, as well as to understand and optimize the entire power system. It is necessary to harmonize with.

(2.2 Outline of power system operation)
Power system operation can be broadly divided into supply and demand operation and system operation.

  Supply and demand operations are to secure power supply capacity for power demands that fluctuate from time to time, maintain a stable frequency by balancing, and power interchange with hydropower, thermal power, nuclear power, and other power companies. It is the most economical operation by combining them comprehensively.

  Grid operation, on the other hand, controls power transmission and substation facilities and operates the power system comprehensively and economically so that the power generated at the power plant can be smoothly transported to the consumption area and maintained at an appropriate voltage. It is.

(2.3 Power system planning and control)
Next, operation of the power system and facility planning will be described.

(Bank overload)
Since electricity cannot be stored, it is necessary to perform control such as switching between power generation and power system according to the demand (consumption) so as to maintain an optimal supply and demand balance. However, if demand rapidly increases in a specific area, the current passing through the transformer (bank) of the distribution substation, which is a power distribution facility, may exceed the operating limit. In such a case, for the primary load increase, create an optimal generator operation plan in the power generation plan on the previous day or the day, and eliminate overload even at the expense of efficiency, such as changing the generator or switching the system. Such operations are performed. In addition, if the load is expected to increase continuously, the demand is estimated at the facility planning stage, and in order to prevent excess or deficiency of power even in the future, capital investment such as bank expansion will be carried out and the power system supply reliability Is maintained.

(Distribution line overload and distribution line replacement)
Similarly to the bank overload, the distribution line 27 predicts demand at the facility planning stage, and determines the material and thickness of the distribution line 27 to be used. However, when the load connected to the distribution line 27 increases, there is a possibility that the passage allowable value of the distribution line 27 will be exceeded. In such a case, the load is temporarily distributed to the nearby distribution lines, but if the load is expected to increase continuously, the redistribution work is performed on the distribution line 27 having a large allowable passage value and overloading is performed. While minimizing transmission loss.

(Rosmini system)
Generally, the configuration of the power system is such that the demand is predicted at the stage of facility planning, and the transmission loss is minimized in the planned section from the load balance of each transmission line 27. However, the load changes from moment to moment, and in order to realize a system configuration (optimum loss mini system) that minimizes transmission loss of power distribution facilities, online system control is required according to the load situation. .

(Overload elimination)
The transmission line 60 connecting the substations 11 to 15 has the allowable current of the electric wire itself, and the transmission capacity is determined from the allowable current of the circuit breaker and disconnector connected to the transmission line 60. The protective relay operates to stop the power transmission line 60. For this reason, the determination of the power transmission route so that the power transmission line 60 is not overloaded and the outputs of the generators 16 to 18 are determined.
JP 2003-243017 A Lecture by Semester University Power System Engineering Published by Maruzen Co., Ltd. Toshihiko Komukai, Shoichi Irokawa, Masakazu Kato Power System Engineering, published by Denki Shoin, written by Taiji Sekine

  As described above, the secondary battery 1 that has been installed by customers in the past does not always use up all of the capacity of the secondary battery 1, leaving a surplus. The control described in the prior art is performed on the power system side, but in order to control more efficiently, if it is possible to control the device using active power, reactive power, and voltage as resources in the vicinity of the consumer, The effect is great. From the above, it is conceivable to use the remaining capacity of the secondary battery 1 for power system control.

  Patent Document 1 discloses a technique for grasping in real time the charge / discharge capability (hereinafter also referred to as “control reserve capacity”) of the secondary battery 1 on-line. However, there is no conventional means for capturing the operation schedule of the secondary battery 1, and no control of the electric power system that makes the best use of the capacity of the secondary battery 1 is performed.

  This invention is made | formed in view of such a situation, The electric power system control method using the secondary battery which can control an electric power system more efficiently by utilizing the capability of a secondary battery It is another object of the present invention to provide a power system control device.

  In order to achieve the above object, the present invention takes the following measures.

  That is, the first aspect of the present invention is a secondary device that is provided on a consumer side that uses power, is connected to a power system that supplies power to the consumer, and performs charging and discharging for the consumer. A method and apparatus for performing power flow control or system control of a power system using a battery, acquiring a control surplus capacity that is charge / discharge capacity of the secondary battery from the secondary battery, and using the acquired charge / discharge capacity The operation schedule of the secondary battery or the charge / discharge amount of the secondary battery is determined, and the secondary battery is controlled based on the determined operation schedule or charge / discharge amount.

  Therefore, by taking the above measures, the operation schedule or charge / discharge amount of the secondary battery connected to the power system is determined on the power system side, and the secondary battery is further determined based on the determined operation schedule or charge / discharge amount. The battery can be controlled.

  The second aspect of the present invention is determined when the determined charge / discharge amount exceeds the current charge / discharge capacity of the secondary battery in the power system control method and apparatus of the first aspect. The shortage amount, which is a value obtained by subtracting the current charge / discharge amount from the charged / discharge amount, is displayed.

  Therefore, it is possible to grasp the current shortage of charge / discharge amount by taking the above-described means.

  According to a third aspect of the present invention, in the power system control method and apparatus according to the first or second aspect, the passing power of the transformer of the distribution substation provided in the power system exceeds a predetermined allowable value. In such a case, the predetermined operation schedule of the secondary battery is acquired from the secondary battery, and the transformer is considered in consideration of the charge / discharge amount of the secondary battery based on the charge / discharge capability and the scheduled operation schedule. The operation schedule is determined so as to suppress the passing power of the vehicle.

  Therefore, by taking the above-described means, it is possible to suppress the passing power of the transformer by operating the secondary battery according to the determined operation schedule.

  According to a fourth aspect of the present invention, in the power system control method and apparatus of the third aspect, based on the charge / discharge capability, the passing power of the transformer is suppressed in consideration of the charge / discharge amount by the secondary battery. A control command for controlling the secondary battery is created, and the charge / discharge amount of the secondary battery is controlled based on the control command.

  Therefore, by taking the above-described means, it becomes possible to control the secondary battery so that the power passing through the transformer can be suppressed.

  According to a fifth aspect of the present invention, in the power system control method and apparatus according to the third or fourth aspect, the charge amount of the secondary battery is acquired from the secondary battery, and the charge amount and the scheduled operation schedule, or the charge / discharge capability is obtained. Based on the above, calculate the grid condition that minimizes the transmission loss of the power grid, and determine the operation schedule of the secondary battery based on the grid condition and the scheduled operation schedule, or The charge / discharge amount of the secondary battery is determined based on the above.

  Therefore, by taking the above measures, it is possible to grasp a system condition that minimizes the transmission loss of the power system. Furthermore, it becomes possible to determine the operation schedule that satisfies the system condition, or the charge / discharge amount of the secondary battery.

  According to a sixth aspect of the present invention, in the power system control method and apparatus according to any one of the third to fifth aspects, the passing power of the distribution lines provided in the power system is likely to exceed a predetermined allowable value. In such a case, based on the charge / discharge capacity and the scheduled operation schedule, the secondary battery operation schedule that suppresses the passing power of the distribution line in consideration of the charge / discharge amount of the secondary battery, or the charge of the secondary battery Determine the amount of discharge.

  Therefore, the passing power of the distribution line can be suppressed by controlling the secondary battery based on the operation schedule determined by taking the above-described means or the charge / discharge amount of the secondary battery.

  According to a seventh aspect of the present invention, in the power system control method and apparatus according to the first aspect, from a power in a consumer supplied from the power system using a predetermined current correlation equation, If the estimated power is likely to exceed the predetermined allowable value for the specific point, the power at the specific point may be set to satisfy the allowable value. The secondary battery is discharged.

  Therefore, by taking the above-described means, it is possible to satisfy the allowable power value at a specific point by controlling the charge / discharge amount of the secondary battery.

  According to an eighth aspect of the present invention, in the power system control method and apparatus according to the seventh aspect, when the secondary battery is discharged, the power of the secondary battery relative to the estimated power at the specific point and the power at the specific point is determined. The charge / discharge amount of the secondary battery is determined using a sensitivity constant representing the sensitivity to the charge / discharge amount, and the secondary battery is discharged according to the determined charge / discharge amount.

  Therefore, by taking the above-described means, it is possible to satisfy the allowable power value at a specific point by controlling the charge / discharge amount of the secondary battery.

  A ninth aspect of the present invention uses a secondary battery that is provided on the consumer side that uses power, is connected to a power system that supplies power to the consumer, and performs charging and discharging for the consumer. Thus, the method and apparatus for controlling the power system calculates the total charge / discharge amount of all the secondary batteries necessary for controlling the power system. Next, distribution calculation for distributing the calculated total charge / discharge amount to each secondary battery according to a predetermined distribution method is performed. Furthermore, each secondary battery is controlled based on the result of this distribution calculation.

  Therefore, by taking the above measures, the charge / discharge amount is allocated to each of the plurality of secondary batteries provided on each customer side, and each secondary battery is controlled based on the allocated result. Thus, the power system can be controlled efficiently.

  The tenth aspect of the present invention also uses a secondary battery that is provided on the consumer side that uses power, is connected to a power system that supplies power to the consumer, and performs charging and discharging for the consumer. And it is the method and apparatus which control an electric power system, Comprising: The total charging / discharging amount by all the secondary batteries required for control of an electric power system is calculated. Next, the charge / discharge capacity of each secondary battery is stored in the storage means. Further, distribution calculation is performed to distribute the calculated total charge / discharge amount to each secondary battery based on the charge / discharge capacity stored in the storage means. Furthermore, each secondary battery is controlled based on the result of the distribution calculation.

  Therefore, by taking the measures as described above, the charge / discharge amount for a plurality of secondary batteries provided on each customer side is determined for each secondary battery for efficient control of the power system. Can be determined according to ability.

  The eleventh aspect of the present invention also uses a secondary battery that is provided on the consumer side that uses power, is connected to a power system that supplies power to the consumer, and performs charging and discharging for the consumer. And it is the method and apparatus which control an electric power system, Comprising: The total charging / discharging amount by all the secondary batteries required for control of an electric power system is calculated. Next, the sensitivity of each secondary battery to the power system is calculated. Further, distribution calculation is performed to distribute the calculated total charge / discharge amount to each secondary battery according to the calculated sensitivity. Furthermore, each secondary battery is controlled based on the result of the distribution calculation.

  Therefore, by taking the measures as described above, for efficient control of the electric power system, the charge / discharge amount for the plurality of secondary batteries provided on each customer side is determined by the electric power system of each secondary battery. Can be determined according to the sensitivity to.

  The twelfth aspect of the present invention also uses a secondary battery that is provided on the consumer side that uses power, is connected to a power system that supplies power to the consumer, and performs charging and discharging for the consumer. And it is the method and apparatus which control an electric power system, Comprising: The total charging / discharging amount by all the secondary batteries required for control of an electric power system is calculated. Next, the charge / discharge capacity of each secondary battery is stored in the first storage means. Furthermore, a predetermined priority order for each secondary battery is stored in the second storage means. Furthermore, the total charge / discharge amount is preferentially allocated from the secondary batteries with high priority stored in the second storage means to the full charge / discharge capacity stored in the first storage means, so that the total The charge / discharge amount is distributed to each secondary battery. And each secondary battery is controlled based on the result of distribution.

  Therefore, by taking the measures as described above, for efficient control of the power system, the charge / discharge amount for the plurality of secondary batteries provided on each consumer side is determined according to the priority order of each secondary battery. Can be determined according to.

  The thirteenth aspect of the present invention also uses a secondary battery that is provided on the consumer side that uses power, is connected to a power system that supplies power to the consumer, and performs charging and discharging for the consumer. And it is the method and apparatus which control an electric power system, Comprising: The total charging / discharging amount by all the secondary batteries required for control of an electric power system is calculated. Next, the charge / discharge capacity of each secondary battery is stored in the first storage means, and the charge / discharge capacity during overload operation of each secondary battery is stored in the second storage means. Furthermore, when the total charge / discharge amount is larger than the total value of the charge / discharge capacity stored in the first storage unit, the total charge / discharge amount is stored in the first storage unit, Based on the charge / discharge capability at the time of overload operation stored in the second storage means, the battery is distributed to each secondary battery, and each secondary battery is controlled based on the distribution result.

  Therefore, by taking the measures as described above, for efficient control of the electric power system, the charge / discharge amount for a plurality of secondary batteries provided on each consumer side is determined by the rated charge of each secondary battery. This can be determined in consideration of not only the discharge capacity but also the charge / discharge capacity during overload operation.

  The fourteenth aspect of the present invention also uses a secondary battery that is provided on the consumer side that uses power, is connected to a power system that supplies power to the consumer, and performs charging and discharging for the consumer. Then, a method for controlling the power system and a total charge / discharge amount by all the secondary batteries necessary for controlling the power system are calculated. In addition, the charge / discharge capacity of each secondary battery is stored in the first storage means, and the charge / discharge capacity and the duration of each secondary battery during overload operation are stored in the second storage means. Furthermore, when the total charge / discharge amount is larger than the total value of the charge / discharge capacity stored in the first storage unit, the total charge / discharge amount is stored in the first storage unit, Based on the charge / discharge capability at the time of overload operation stored in the second storage means and the duration thereof, the secondary battery is distributed to each secondary battery so that the operation duration is the longest. Then, each secondary battery is controlled based on the distribution result.

  Therefore, by taking the measures as described above, for efficient control of the electric power system, the charge / discharge amount for a plurality of secondary batteries provided on each consumer side is determined by the rated charge of each secondary battery. Considering not only the discharge capacity but also the charge / discharge capacity at the time of overload operation, the operation duration time can be determined to be the longest.

  According to the power system control method and power system control apparatus using the secondary battery of the present invention, the power system can be controlled more efficiently by utilizing the capacity of the secondary battery.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In addition, the code | symbol in the figure used for description of each following form attaches | subjects and shows the same code | symbol about the same part as FIG.31 and FIG.38.

(First embodiment)
The power system control apparatus to which the power system control method according to the first embodiment of the present invention is applied is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer. It is an apparatus that performs power flow control or system control of a power system using a secondary battery that charges and discharges for a consumer. A block diagram of a power system controlled by such a power system control apparatus is shown in FIG.

  As shown in FIG. 1, the power system controlled by the power system control apparatus according to the present embodiment is configured such that power is transmitted from a thermal power plant 16, a hydropower plant 17, or a nuclear power plant 18 via a transmission line 60. The secondary batteries 21 to 24 are dispersedly arranged in the facility premises of the primary or secondary distribution substations 11 to 15 and the consumers 62 to 64 that are further distributed by the distribution lines 27 from there. The distribution line 27 is provided with a switch 25 and a section switch 26 as appropriate.

  At the installation location of each secondary battery 21 to 24, communication means is provided with a control station such as a central power supply command station (not shown), and an output adjustment signal from the control station is received. By adjusting the output, it contributes to the power system. Moreover, about the said consumers 62-64, it is also possible to transmit / receive information by using communication means, such as an optical fiber cable which the electric power company has installed.

  FIG. 2A is a block diagram illustrating an application example of the power system control device 30 to which the power system control method according to the present embodiment is applied.

  The power system control device 30 includes a control function 31 that performs control following a change in the power system 10 as in load frequency control, and a planning function 32 that plans the next day power generation plan and the like. In order to realize the control function 31 and the planning function 32, the power system control device 30 includes an acquisition unit 301, a determination unit 302, a control unit 303, a display unit, and a display unit as illustrated in the block diagram of FIG. Unit 304 and a system condition calculation unit 305.

  The acquisition unit 301 acquires the amount of charge of each secondary battery 44 and the control capacity that is charge / discharge capacity from each secondary battery 44. Further, the system state (voltage, current) of the power system 10 is acquired from each detector (not shown) provided at each place of the power system 10. In FIG. 2A, only one secondary battery control system 40 and secondary battery 44 are representatively described, but in reality, the power system controller 30 includes a plurality of secondary batteries. A control system 40 can be connected. In addition, when the passing power of the transformers of the substations 11 to 15 is likely to exceed a predetermined allowable value, a predetermined operation schedule of the secondary battery 44 is held in the secondary battery control system 40. Obtained from the scheduled operation schedule database 40a.

  The determination unit 302 determines the operation schedule of the secondary battery 44 or the charge / discharge amount of the secondary battery 44 using the charge amount acquired by the acquisition unit 301 and the remaining control power. Further, when the passing power of the transformers of the substations 11 to 15 is likely to exceed a predetermined allowable value, the secondary battery 44 is based on the control remaining capacity acquired by the acquisition unit 301 and the scheduled operation schedule. The operation schedule of the secondary battery 44 is determined so as to suppress the passing power of the transformer in consideration of the charge / discharge amount due to. Furthermore, when the calculation result of the system condition is output from the system condition calculation unit 305, the operation schedule of the secondary battery 44 is determined based on the calculation result and the scheduled operation schedule acquired by the acquisition unit 301. Alternatively, the charge / discharge amount of the secondary battery 44 is determined based on the system condition and the control capacity. Further, when the passing power of the distribution line 27 provided in the power system 10 is likely to exceed a predetermined allowable value, the charge / discharge amount by the secondary battery 44 is determined based on the control remaining capacity and the scheduled operation schedule. The operation schedule of the secondary battery 44 or the charge / discharge amount of the secondary battery 44 that suppresses the passing power of the distribution line 27 in consideration is determined.

  Moreover, the determination part 302 is the specific point which exists between the electric power grid | system 10 and the consumers 62-64 from the electric power in the consumers 62-64 supplied from the electric power grid | system 10 using a predetermined current correlation type | formula. Is estimated, and the estimation result is output to the control unit 303. Furthermore, the determination unit 302 determines the charge / discharge amount of the secondary battery 44 using a sensitivity constant representing the sensitivity between the power at the specific point and the charge / discharge amount of the secondary battery 44 with respect to the power at the specific point. The charged / discharged amount is output to the control unit 303.

  The control unit 303 outputs the operation schedule or the charge / discharge amount control command determined by the determination unit 302 to the secondary battery control system 40 of the corresponding secondary battery 44. Further, estimated power at a specific point existing between the power system 10 and the consumers 62 to 64 is output from the determination unit 302, and this estimated power is likely to exceed a predetermined allowable value for the specific point. In this case, a control command is generated so that the electric power at the specific point satisfies the allowable value, and this control command is output to the secondary battery control system 40.

  If the charge / discharge amount determined by the determination unit 302 exceeds the current charge / discharge amount of the secondary battery 44, the display unit 304 subtracts the current charge / discharge amount from the determined charge / discharge amount. Displays the shortage value.

  The system condition calculation unit 305 calculates a system condition that minimizes the transmission loss of the power system 10 based on the charge amount and the scheduled operation schedule acquired by the acquisition unit 301 or the control surplus capacity, and determines the calculation result. The data is output to the unit 302.

  The secondary battery control system 40 is connected to the power system 10 via a circuit breaker 41 and a detector 42 in addition to the power system control device 30. The secondary battery control system 40 controls the secondary battery 44 that it is in charge of based on the control command output from the power system control device 30. Thus, load leveling to the loads L1 to L3 on the customer side is performed while responding to the power system control device 30.

  The secondary battery control system 40 is used as an interface for sending a control command sent from the power system control device 30 to the secondary battery 44 via the DC / AC converter 43 in this way. This is because there is a restriction on the signal strength received by the secondary battery 44, and the secondary battery control system 40 has a case where the strength of the signal sent from the power system control device 30 exceeds this restriction. The secondary battery 44 is protected by converting the signal intensity into a value that can be received by the secondary battery 44 and then outputting the signal intensity to the DC / AC converter 43. Therefore, when the intensity of the signal from the power system control device 30 is within the allowable value of the secondary battery 44, the secondary battery control system 40 is omitted, and the power system control device 30, the DC / AC converter 43, May be connected directly.

  The detector 42 measures the voltage and current at the connection point with the electric power system 10, gives the measurement result to the secondary battery control system 40, and also detects the abnormality due to the system fault, And the customer's premises equipment is disconnected from the power system 10.

  Next, operation | movement of the control function 31 of the electric power system control apparatus 30 which concerns on this Embodiment comprised as mentioned above is demonstrated using the flowchart shown in FIG.

  First, the acquisition unit 301 acquires the system state (voltage, current) of the power system 10 from each detector (not shown) provided in each place of the power system 10 (SP01) and charges from each secondary battery 44. A quantity is acquired (SP02).

  The acquired information is sent from the acquisition unit 301 to the determination unit 302, and the determination unit 302 sets the charge amount acquired in SP02 as the virtual power generation amount (maximum power generation amount = dischargeable amount of the secondary battery). ) (SP03).

  Then, the determination unit 302 further changes the number of secondary batteries (SP04) and the amount of power generation of the secondary battery (SP05) based on the system state acquired in SP01 and the virtual power generation amount set in SP03. The evaluation result by the objective function at the time of the calculation is calculated (SP06). When this evaluation result is the best solution (SP07: Yes), the output of the secondary battery is stored as a new operation pattern (SP08).

  Thereafter, the processing from SP06 to SP08 is repeated in a state where the power generation amount of the secondary battery is changed (SP09: Yes). Then, when the processing from SP06 to SP08 in a state where the power generation amount of the secondary battery is changed (SP09: No), the processing from SP05 to SP09 is repeated for another secondary battery ( SP10: No). Thereby, the processing from SP05 to SP09 is performed for all the secondary batteries (SP10: Yes).

  If the operation pattern of the secondary battery that can achieve the purpose of contributing to the power system 10 is obtained as a result of checking all the operation combinations of the secondary batteries in this way (SP11: Yes), the operation pattern is changed to the control unit 303. Is output to the secondary battery control system 40 of the corresponding secondary battery 44, and the secondary battery 44 is controlled by the secondary battery control system 40 to operate according to this operation pattern (SP12). Although an example for obtaining an optimal solution has been described above, it goes without saying that the same is true even if it is performed by another optimization method.

  When the purpose cannot be achieved in SP11 (SP11: No), the operation pattern is displayed as an alarm result from the display unit 304 and notified to the operator of the power system 10 (SP13). By continuing these operations (SP14), the power system 10 is monitored and controlled as needed.

  Next, the operation of the planning function 32 of the power system control device 30 according to the present embodiment configured as described above will be described with reference to the flowchart shown in FIG.

  When the operation plan of the secondary battery 44 is made by the power system control device 30, the acquisition unit 301 first acquires the charge amount and the operation schedule from the secondary battery 44 (SP21). Further, the acquisition unit 301 acquires from the power system 10 operation plan data (power supply schedule to the power system based on the demand prediction) of the power system 10 at the time of planning the operation plan (SP23).

  Next, from the operation schedule acquired by the acquisition unit 301 in SP21, the determination unit 302 acquires the operation schedule of each secondary battery 44 for that time (SP24). Then, the determining unit 302 sets the charge / discharge amount and the charge amount in the operation schedule of each secondary battery 44 as a virtual power generation amount (maximum power generation amount = dischargeable amount of the secondary battery) (SP25).

  In SP04 to SP11, the power generation amount of the secondary battery 44 for the purpose of contributing to the power system 10 is determined based on the information on the power system 10 and the virtual power generation amount set in SP25. Since the operations from SP04 to SP11 are the same as those shown in FIG. 3, the description thereof is omitted here.

  As a result of checking all the operation combinations of the secondary batteries in this way, if an operation pattern of the secondary battery that can achieve the purpose of contributing to the power system 10 is obtained (SP11: Yes), the operation pattern is changed to each secondary battery. The battery 44 is updated as a new operation schedule. Then, the determining unit 302 subtracts the increased amount as the power generation amount of the secondary battery 44 from the charge amount, and calculates a new power reception amount (SP26).

  On the other hand, when the purpose cannot be achieved (SP11: No), the operation pattern is displayed as an alarm result from the display unit 304 and notified to the operator of the power system 10 (SP27). This process is repeated for the time required for the operation plan (SP28: No → SP22). For example, if the operation plan is a plan creation for the next day, it is for 24 hours, and if it is a plan creation for n hours ahead, n hours are processed.

  When the plan creation ends (SP28: Yes), a new operation schedule is output from the control unit 303 to the secondary battery control system 40 (SP29). The operation schedule formulated in this way is activated and processed at a predetermined time or periodically at the time of plan correction n hours ahead. Therefore, when an operation schedule is continuously made for the next time step (SP30: Yes), the process is repeated from SP21. In addition, although the example for obtaining the optimal solution has been described above, it goes without saying that the same is true even if other optimization methods are used.

  The secondary battery 44 that contributes to the electric power system 10 is controlled by the control function 31 and the planning function 32 as described above, and an operation schedule is made. The control function 31 and the planning function 32 have been described by way of example in the case where they are implemented in the power system control device 30. However, a part or all of these functions may be implemented in the secondary battery control system 40. Also good. In the above description, the generator and the secondary battery are handled separately, but the present invention can be similarly applied to a method of optimizing the generator and the virtual generator together.

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, by controlling only the generator located in a place away from the demand area, the power system is controlled. However, by controlling the secondary battery 44 installed in a place close to the demand area, a greater effect can be obtained than in the past, and the current control of the power system 10 can be controlled more than ever. It can be easily realized.

(Second Embodiment)
The power system control device 30 to which the power system control method according to the second embodiment of the present invention is applied has a reliability operation planning function 33 as shown in FIG. And different. Therefore, only different points will be described here.

  The operation of the reliability operation planning function 33 will be described using the flowchart shown in FIG. That is, the reliability operation planning function 33 first performs demand prediction by performing total demand prediction calculation and load prediction calculation (SP41), and then performs supply and demand operation by performing economic load allocation calculation and aptitude reserve allocation calculation. Make a plan (SP42). Then, a facility work stoppage plan for the main distribution facility is made by performing the stop schedule adjustment calculation (SP43), and further, the charge amount from each secondary battery 44 acquired in SP02 and the virtual power generation set in SP03 The reliability operation calculation is performed by performing overload countermeasure calculation, frequency abnormality countermeasure calculation, and voltage adjustment plan calculation using the amount (SP44). For example, bank overload can be performed by performing optimization calculation for the purpose of suppressing the bank increase capacity using the charge amount from each secondary battery 44 acquired in SP02 and the virtual power generation amount set in SP03. The virtual power generation amount (charge / discharge amount) of each secondary battery that eliminates the above is determined. Moreover, although the generator and the secondary battery were handled separately in the above operation, the present invention can be similarly applied to a method of optimizing the generator and the virtual generator together.

  When it is determined that there is no problem in system operation as a result of the reliability operation calculation performed in SP44 (SP45: None), the result of this reliability operation calculation is regarded as an appropriate operation plan (SP46). The result of the reliability operation plan is output to the secondary battery 44 via the secondary battery control system 40 (S47).

  On the other hand, when it is determined that there is a problem in system operation as a result of the reliability operation calculation performed in SP44 (S45: present), the process returns to SP42, SP43, or SP44. Even when there is a problem in system operation, the overload countermeasure is an important countermeasure item because it may spread to an accident to the power system 10. Usually, temporary overload is taken by controlling the power generation amount of each generator or switching the system. In the present embodiment, in the reliability operation planning function 33, when it is determined that there is a problem in system operation due to bank overload (exceeding passage allowable current), in addition to the adjustment of only the conventional generator, the virtual generator Is added to optimize the system.

  FIG. 7 shows a flowchart when an optimal power flow (OPF) process is performed as an example of the optimization calculation performed in SP44. However, it should be noted that the optimization calculation performed at SP44 is not limited to OPF.

  Since the calculation method by the OPF is known, detailed description is omitted here, but the OPF calculation obtains an optimal solution by continuously repeating the OPF solution and the power flow calculation under the linearized system operation conditions. It is a process, and the target system state is derived by performing the following process.

  First, the initial system state (SP44a) is used as a power flow calculation case, and the control variables (active power and reactive power of each generator) are optimized by optimizing the linearized constraint at each OPF iteration (SP44b to SP44f). Determine a new correction direction. Movement in that direction is performed, the value of the corrected control variable is returned to the power flow calculation (SP44e), the system state of the new point is recalculated, and the constraint condition is linearized again. If the target solution is not obtained, the conditions are adjusted so that the target solution range is reached by lowering the priority level of the system operation conditions and loosening the limit (SP44g, SP44h). ). When the amount of change in all control variables becomes small, it is considered that the OPF process has converged (SP44f). Through this optimum power flow calculation process, the power generation amount of each generator and the active power and reactive power on the system that are optimal for system operation are obtained.

  As a result, if there is no problem in system operation (SP45: none), the output of each generator including the output of the secondary battery becomes an appropriate operation plan (SP46). By making an output request (SP47) to each secondary battery with the operation pattern, it becomes possible to have an appropriate power system operation configuration. With the processing described above, the bank allowable current can be suppressed.

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, countermeasures are implemented by controlling the power generation amount of each generator or switching the power system 10. The countermeasure against the bank passing current that has been made becomes possible by controlling the secondary battery 44 installed near the load. This also makes it possible to suppress the increase in facilities that had to be expanded due to an increase in peak load.

(Third embodiment)
The power system control device 30 to which the power system control method according to the third embodiment of the present invention is applied has a reliability operation control function 34 as shown in FIG. And different. Therefore, only different points will be described here.

  The operation of the reliability operation control function 34 will be described with reference to the flowchart shown in FIG. That is, the reliability operation control function 34 is a control function for performing stable system operation in accordance with the system operation state of the power system 10 that changes every moment. Among them, the countermeasure against overload is an important countermeasure item because there is a possibility of spreading to an accident to the power system 10. Usually, temporary overload is taken by controlling the power generation amount of each generator or switching the system.

  That is, the reliability operation control function 34 takes in a state such as voltage and current from the power system 10 (SP81). Then, in addition to the captured voltage, current, etc., the bank operation is performed as a result of the reliability operation control calculation (SP82) using the charge amount captured at SP02 and set as the virtual power generation amount at SP03. When it is determined that there is a problem in system operation due to (exceeding allowable passage current) (SP83: present), in addition to the adjustment for switching the conventional power transmission route, the secondary battery 44 is optimized as a virtual generator. That is, by performing optimization calculation for the purpose of suppressing the bank increase capacity, the virtual power generation amount (charge / discharge amount) of each secondary battery that eliminates the bank overload is determined (SP84). This optimization calculation is the same as the optimization calculation performed in SP44. Therefore, although the generator and the secondary battery are divided and the generator and the secondary battery are handled separately in the above operation, the same applies to the method of optimizing the generator and the virtual generator together.

  Furthermore, by making an output request to the secondary battery 44 via the secondary battery control system 40 (SP85), it becomes possible to perform proper operation of the power system 10. With the processing described above, it is possible to suppress the bank allowable current online.

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, countermeasures are implemented by controlling the power generation amount of each generator or switching the power system 10. The countermeasure against the bank passing current that has been performed can be realized more efficiently by controlling the secondary battery 44 installed in a place close to the load. As a result, it is possible to suppress an increase in facilities that had to be expanded in banks for stable operation of the power system 10.

(Fourth embodiment)
The power system control method according to the fourth embodiment of the present invention is that the power system 10 is controlled in the secondary battery control system 40 having the overload sequential suppression function 51 as shown in FIG. Different from the first embodiment. Therefore, only different points will be described here.

  The overload sequential suppression function 51 estimates the bank load power flow from a current value at a measurable point and a current correlation equation obtained in advance, and controls the secondary battery 44 locally. The operation of this overload sequential suppression function 51 will be described using the flowchart shown in FIG.

  In order to estimate the bank load power flow, first, a current correlation equation is registered in advance in the secondary battery control system 40 (SP51). There are various current correlation equations, such as those that are physically determined from the configuration of the power system 10 and those that are calculated by a system control system (not shown) that controls the power system 10. Even if it is a thing, the following functions and operations do not change.

  Next, the overload sequential suppression function 51 acquires the current value from the detector 42 at the power system linkage point of the secondary battery 44 or at a point where other current can be measured and the current correlation equation is obtained (SP52). . Further, an estimated value of the bank current is obtained from the current value acquired in SP52 using the current correlation equation registered in SP51 (SP54).

  And it is checked whether the estimated value calculated | required by SP54 is in the preset registered value (SP55). If the estimated value deviates from the set value as a result of this check (SP55: No), it is further checked whether the charge amount of the secondary battery 44 is a controllable amount (SP56). When the charge amount of the secondary battery 44 is a controllable amount (SP56: Yes), a certain amount of discharge control is performed on the secondary battery 44 (SP57).

  When the processing from SP54 to SP57 is repeatedly performed (SP58: Yes), the processing returns to SP54 after the processing of SP57. Otherwise (SP58: No), the processing is terminated. As a result, the current at the above point is taken in again, the bank current is estimated (SP54), and a certain amount of discharge control is repeatedly performed until the bank current value is within the setting (SP55 to SP57). When the processing from SP54 to SP57 is repeatedly performed, the charge / discharge amount controlled for the secondary battery 44 at SP57 outputs a value increased by + α (value can be arbitrarily set) for the first time.

  Thereby, when the estimated current value of the bank falls within the set range in the check of SP55 (SP55: Yes), the process is terminated (SP59). The overload sequential suppression function 51 operates periodically, estimates the bank current by performing the processing from SP54 to SP57, and performs suppression control. Note that at the next start-up, if the secondary battery 44 is discharging the contribution to the electric power system 10, it stops (SP60: Yes). On the other hand, when the estimated value of the bank current is likely to exceed the set value (SP60: No), the processing from SP54 to SP57 is performed again.

  When the charge / discharge amount is increased compared to the charge amount of the secondary battery 44 during the process, and it is determined in SP56 that the charge amount of the secondary battery 44 is uncontrollable (SP56: No), Notifying the outside of the amount of charge of the secondary battery 44 that the control is impossible due to the shortage (SP61). Then, when the control is continued thereafter (SP62: Yes), the process returns to SP54, and when the control is not continued (SP62: No), the process proceeds to SP60.

  As described above, according to the secondary battery control system 40 to which the power system control method according to the present embodiment is applied, the bank passage allowable current of the power system 10 is suppressed by controlling the secondary battery 44 locally. Control is possible. Further, even when the charge / discharge amount of the secondary battery 44 cannot be uniquely determined, it is possible to approach the target value by sequential control. Further, even when a plurality of secondary batteries 44 are installed on the same power system 10, each can contribute to the power system 10 independently.

(Fifth embodiment)
As shown in FIG. 12, the power system control method according to the fifth embodiment of the present invention includes a power system control apparatus 30 having a flow coefficient creation function 54 and a secondary having an overload immediate suppression function 52. The point realized by the battery control system 40 is different from the first embodiment. Therefore, only different points will be described here.

  The flow coefficient creation function 54 receives a necessary coefficient from the power system 10 and controls the secondary battery 44 via the overload immediate suppression function 52 of the secondary battery control system 40 based on the coefficient. Operations performed by the power system control device 30 and the secondary battery control system 40 will be described with reference to the flowchart of FIG. In the flowchart shown in FIG. 13, steps that perform the same processing as in the flowchart shown in FIG. 11 are given the same SP numbers.

  In order to estimate the bank load power flow, first, a current correlation equation is registered in advance in the secondary battery control system 40 (SP51). This current correlation equation is as described in the fourth embodiment.

  Next, the overload immediate suppression function 52 acquires the current value from the detector 42 at the power system linkage point of the secondary battery 44 or at a point where other current can be measured and the current correlation equation is obtained (SP52). . Then, using the current correlation equation registered in SP51, an estimated value of the bank current is obtained from the current value acquired in SP52 (SP54).

  Furthermore, the overload immediate suppression function 52 checks whether the estimated value obtained in SP54 is within a preset value registered (SP55). As a result of this check, when the estimated value deviates from the set value (SP55: No), the processing of SP73 described below is performed, and the bank current estimated value falls within the set range (SP55: In Yes), the process ends (SP59).

  On the other hand, the flow coefficient creation function 54 of the power system control device 30 takes in the bank current from the power system 10 (SP71). Furthermore, an electrical equivalent circuit is created from the equipment configuration of the power system 10 (connection configuration of each equipment and the impedance of the power transmission line), and the power line power flow or the distribution line power flow is minutely changed with respect to a minute change in the output amount of the secondary battery 44. A sensitivity matrix (hereinafter referred to as “flow coefficient”) having a sensitivity constant that is the ratio of the above is created (SP72).

  There are various methods for calculating the flow coefficient, such as an exact calculation method such as Newton-Raphson method, and an approximate method using an admittance matrix. There is no. The details of the flow coefficient are described in detail in Non-Patent Document 2, especially pages 45-46. In the present embodiment, the flow coefficient creation function 54 creates a flow coefficient indicating the current change amount in the bank with respect to the charge / discharge amount of the secondary battery 44, and uses the created flow coefficient as an overload of the secondary battery control system 40. Transmit to the immediate suppression function 52. In this case, the flow coefficient of other secondary batteries is set to zero.

  In the present embodiment, a case where overload elimination control is performed with one secondary battery 44 is described. However, cooperative control can be performed with a plurality of secondary batteries 44. In this case, several methods such as providing a sharing ratio of the secondary battery 44 to the flow coefficient calculated in the center in advance can be considered, but the operation is the same.

  Now, the overload immediate suppression function 52 divides the suppression amount obtained by subtracting the set value from the bank estimated current value in SP73 by the flow coefficient sent from the flow coefficient creation function 54 in SP72. The charge / discharge amount of the secondary battery 44 is obtained (SP73). Next, it is checked whether the charge amount of the secondary battery 44 is a controllable amount (SP74). And when the charge amount of the secondary battery 44 is a controllable amount (SP74: Yes), discharge control is performed with respect to the secondary battery 44 (SP75).

  After SP75, if the series of processing up to SP54, SP55, SP73, SP74, and SP75 is repeated (SP76: Yes), the processing returns to SP54, and if not (SP76: No), the processing is performed. finish. As a result, the current at the above point is taken in again, the bank current is estimated (SP54), and a certain amount of discharge control is repeatedly performed until the bank current value is within the setting (SP55, SP73, SP74, and SP75).

  On the other hand, when it is determined that the charge amount of the secondary battery 44 is uncontrollable (SP74: No), the charge amount of the secondary battery 44 is insufficient and cannot be controlled. Notify (SP61). If control is continued thereafter (SP62: Yes), the process returns to SP54. If control is not continued (SP62: No), discharge control is performed on the secondary battery 44 (SP77). . Then, at the next start-up, if the secondary battery 44 is discharging the contribution to the power system 10, it stops (SP60: Yes). On the other hand, if the estimated value of the bank current is likely to exceed the set value (SP60: No), the process proceeds to SP54.

  As described above, according to the power system control method according to the present embodiment, in secondary battery control system 40, it is possible to perform control to suppress the bank passage allowable current of power system 10. Further, by using the flow coefficient, the charge / discharge amount of the secondary battery 44 can be obtained by a single calculation.

(Sixth embodiment)
In the power system control method according to the sixth embodiment, the power system control method according to the second to fifth embodiments is applied to the replacement of the distribution line 27, that is, the overload of the distribution line 27 is suppressed. It is. Therefore, the power system control method according to the present embodiment is shown in FIG. 5, FIG. 8, FIG. 10 and FIG. 12, and the devices shown in FIG. 6, FIG. 7, FIG. This will be described with reference to the flowcharts of FIGS. 11 and 13.

  First, in the power system control device 30 whose configuration is shown in FIG. 5, if the distribution line overload is calculated in the reliability operation plan calculation of SP44 in FIG. 6 and FIG. By performing the distribution calculation of the secondary battery 44, it becomes possible to determine the optimal operation schedule of the secondary battery 44 that suppresses the replacement of the distribution line 27 (suppression of distribution line overload).

  Further, in the power system control device 30 whose configuration is shown in FIG. 8, if the distribution line overload is determined in the reliability operation control calculation of SP82 in FIG. 9, the secondary battery 44 is used for the purpose of suppressing the distribution line overload. By carrying out the distribution calculation, it becomes possible to determine the optimum operation schedule of the secondary battery 44 that suppresses the replacement of the distribution line 27 (suppression of distribution line overload).

  Further, in the secondary battery control system 40 whose configuration is shown in FIG. 10, the current correlation formula between the secondary battery 44 and the connection point is registered in the overload sequential suppression function 51 in SP51 in FIG. 10. This current correlation equation is intended to suppress overloading of the distribution line 27, and instead of the bank current, the current at a point where the distribution line exists is captured for the purpose of suppressing overload of the distribution line 27. It is obtained by correlating the current at this point with the current of the secondary battery 44.

  Then, in the overload sequential suppression function 51 of the secondary battery control system 40, for the purpose of suppressing the overload of the distribution line 27, from the point current acquired in SP52 and the current correlation equation registered in SP51, in SP54, The current at the point where the target distribution line 27 is located is estimated. And if the electric current value of the distribution line 27 has deviated from the setting, the secondary battery 44 which suppresses the replacement of the distribution line 27 (suppression of distribution line overload) by performing a certain amount of discharge from the secondary battery 44. It is possible to determine the optimal operation schedule for the vehicle.

  Similarly, in the secondary battery control system 40 whose configuration is shown in FIG. 12, the SP51 shown in FIG. 13 registers the current correlation equation as the distribution line current instead of the bank current in the overload immediate suppression function 52, The SP coefficient shown in FIG. 13 uses the flow coefficient creation function 54 of the power system control device 30 to create a follow coefficient for the distribution line current at the secondary battery connection point and notify the overload immediate suppression function 52 of the same. .

  Thereby, in the secondary battery control system 40, the distribution line current can be estimated from the point current by using the current correlation equation, and the output amount of the secondary battery 44 can be calculated from the suppression amount. It becomes possible to determine the optimal operation schedule of the secondary battery 44 that suppresses (distribution line overload suppression).

  As described above, according to the present embodiment, conventionally, in order to prevent overload operation of the distribution line 27, it is possible to replace the distribution line 27 or to change the system configuration of the distribution line 27. On the other hand, by controlling the secondary battery 44, the secondary battery 44 can share the load, and it is possible to suppress the replacement of the distribution line 27.

(Seventh embodiment)
The power system control method according to the seventh embodiment is an application of the power system control method according to the second to third embodiments to minimize the power transmission loss of the transmission line 60. Therefore, the power system control method according to the present embodiment is performed using the apparatus shown in FIGS. 5 and 8 and the flowcharts of FIGS. 6, 7 and 9 showing the operation of these apparatuses. explain.

  First, in the power system controller 30 whose configuration is shown in FIG. 5, if the transmission loss of the transmission line 60 is likely to exceed the set value in the reliability operation plan calculation of SP44 in FIGS. 6 and 7, the transmission line By executing the distribution calculation to the secondary batteries 44 so that the transmission loss of 60 is minimized, the optimum operation schedule of the secondary battery 44 that minimizes the transmission loss of the transmission line 60 is determined.

  The calculation method (loss mini calculation) for minimizing the transmission loss of the transmission line 60 is not limited in the present embodiment, but can be realized by using, for example, the method shown in the flowchart of FIG. The processing procedure is as follows.

  First, monitoring point voltage, reactive power, generator voltage, reactive power, phased equipment (power capacitor, shunt reactor, etc.) input state, load tap switching transformer tap position, transmission loss calculation Data collection of target terminal voltage and line power flow is performed (SP90).

  Next, using the charge amount of the secondary battery 44 acquired at SP02 and the virtual power generation amount set at SP03, loss mini calculation such as invalid output of the generator, turning on / off of the phase adjusting equipment, and transformer tap, etc. The target voltage, the monitoring point for the change of the phase adjusting equipment, the voltage of the transmission loss target line, and the change ratio of the reactive power are calculated (SP91).

Then, the following equation (1) is used as a function for determining the magnitude of the deviation φ of the entire power system 10 in order to fall within the allowable range of the monitoring point voltage and the interconnected line invalid power flow.
φ = ΣΔE _i ² (1) formula
Here, ΔE _i : Deviation in voltage or reactive power flow at i monitoring point
And adjust to decrease this (SP92).

The calculation is repeated until the voltage or reactive power at the monitoring point falls within the allowable range or until the following expression (2) is satisfied (SP93: No, SP94).
φ _old −φ _new <ε (2) equation
Here, ε is a sufficiently small constant, φ _{old is} a deviation obtained by the previous calculation, and φ _{new is a} newly calculated deviation.

When the voltage or reactive power at the monitoring point is within the allowable range or when the above expression (2) is satisfied (S93: Yes), the transmission loss L is determined according to the following expression (3). Is calculated so as to minimize (SP95).
L = Σ (P ² + Q ² ) × R / V ² (3) formula
Here, R: resistance, P: active power, Q: reactive power, V: power.

Further, while keeping the voltage at the monitoring point or the reactive power flow from exceeding the allowable range, the calculation of SP95 is repeated until the following expression (4) is satisfied.
L _old −L _new <ε (4)
Here, ε is a sufficiently small constant, L _{old is} a loss obtained by the previous calculation, and L _{new is a} newly calculated loss (SP96: No, SP97).

  Then, when the expression (4) is satisfied (S96: Yes), the power generation plan is determined. That is, the power generation plan for the next day is determined by performing this for one day. Further, the charging / discharging amount of the secondary battery 44 at the time becomes the optimum operation schedule of the secondary battery 44.

  After that, the reliability operation control function 34 of the power system control device 30 whose configuration is shown in FIG. 8 is used to perform the above calculation at regular intervals (for example, about 1 minute) according to the adjustment amount, and control the adjustment device online. The secondary battery output amount that performs processing and contributes to the power system 10 is output to the secondary battery 44 (SP98).

  After that, the system waits until the next control timing (SP99). When the control calculation is performed again at the next timing (SP100: Yes), the process returns to SP90 and the above-described processing is repeated. On the other hand, when the control calculation is not performed (SP100: No), the process ends.

  As described above, according to the present embodiment, conventionally, the power system that minimizes the transmission loss of the transmission line 60 is planned, and the system configuration of the power system is changed accordingly. However, by controlling the secondary battery 44, it is possible to make the current power system 10 a system that minimizes power transmission loss.

(Eighth embodiment)
The power system control method according to the eighth embodiment applies the power system control method according to the second to third embodiments to suppress congestion elimination (transmission line overload suppression) of the transmission line 60. It is a thing. Therefore, the power system control method according to the present embodiment is performed using the apparatus shown in FIGS. 5 and 8 and the flowcharts of FIGS. 6, 7 and 9 showing the operation of these apparatuses. explain.

  That is, in the power system control device 30 whose configuration is shown in FIG. 5, if the power transmission line 60 is overloaded in the reliability operation plan calculation of SP44 in FIGS. 6 and 7, the charge amount of the secondary battery 44 is assumed to be virtual. As the power generation amount, an optimal operation schedule of the secondary battery 44 that performs congestion elimination (transmission line overload suppression) of the transmission line 60 is determined.

  Further, in the power system control device 30 whose configuration is shown in FIG. 8, if the power transmission line 60 is overloaded in the reliability operation control calculation of SP82 in FIG. 9, the charge amount of the secondary battery 44 is set as the virtual power generation amount. Then, the optimum operation schedule of the secondary battery 44 that performs congestion elimination (transmission line overload suppression) of the transmission line 60 is determined.

  As described above, according to the present embodiment, conventionally, it is possible to change the configuration of the power system in order to prevent overload operation of the transmission line 60, or to change the output amount of the generator. What has been done is that the secondary battery 44 shares the load by controlling the secondary battery 44, so that the congestion of the transmission line 60 can be more effectively eliminated.

(Ninth embodiment)
Similarly, the power system control device 30 to which the power system control method according to the ninth embodiment of the present invention is applied is also provided on the consumer side that uses power and is connected to the power system that supplies power to the consumer. In addition, it is a device that performs power flow control or system control of a power system using a secondary battery that charges and discharges for consumers, and is provided in a central power supply command station 50 shown in FIG.

  The central power supply command station 50 includes a communication device 29 in addition to the power system control device 30. On the other hand, each of the secondary batteries 21 to 24 also includes a communication device (not shown). The central power supply command center 50 and each of the secondary batteries 21 to 24 can exchange data such as control data and measurement data through these communication devices. For example, the central power supply command station 50 transmits the control data from the power system control device 30 from the communication device 29 to the communication devices of the secondary batteries 21 to 24, so that each of the secondary batteries 21 to 24 is configured. In accordance with the control data, load frequency control, overload elimination control, and the like are performed.

  The communication path between the communication device 29 of the central power supply command center 50 and the communication devices of the secondary batteries 21 to 24 may be wireless or wired such as an optical fiber cable installed by a power company. May be.

  FIG. 16 is a block diagram illustrating a configuration example of the power system control device 30 to which the power system control method according to the present embodiment is applied. That is, the power system control device 30 to which the power system control method according to the present embodiment is applied includes a control amount calculation unit 311, a storage unit 312, and a distribution amount calculation unit 313.

  The control amount calculation unit 311 acquires the charge / discharge amount from each of the secondary batteries 21 to 24 via the communication device 29. Moreover, the system state quantity (for example, power transmission line tide, frequency, etc.) of each part in the system is acquired from the power system 10. And the total control amount (charge / discharge amount) by the secondary battery required for control of the electric power grid | system 10 is calculated from these acquired information.

  As will be described later, the storage unit 312 stores a distribution method necessary for distribution calculation performed by the distribution amount calculation unit 313 and a control surplus capacity that is the charge / discharge capability of each of the secondary batteries 21 to 24.

  The distribution amount calculation unit 313 stores the total charge / discharge amount calculated by the control amount calculation unit 311 in the storage unit 312 in consideration of the control capacity of each of the secondary batteries 21 to 24 stored in the storage unit 312. The distribution calculation for allocating to each of the secondary batteries 21 to 24 is performed according to the distribution method. The result obtained by this distribution calculation is the output adjustment amount of each secondary battery 21-24. For example, for the purpose of load frequency control, the necessary adjustment amount is calculated by multiplying the system constant K according to the deviation amount from the reference value of the frequency. This calculation method is known and described in Non-Patent Document 1 (particularly Chapter 7). Moreover, if the overload of a specific power transmission facility is eliminated, the amount according to the amount of overload of the facility is adjusted to increase (discharge) on the one hand and decrease (charge) on the other hand. These adjustment amounts are transmitted to the secondary batteries 21 to 24 via the communication device 29.

  Each of the secondary batteries 21 to 24 receives the output adjustment amount transmitted in this way. The output is controlled according to the received output adjustment amount.

  Next, the operation of power system control device 30 according to the present embodiment configured as described above will be described using the flowchart shown in FIG.

  That is, when the power system 10 is controlled by controlling the secondary batteries 21 to 24 by the power system control device 30 according to the present embodiment, first, the secondary batteries 21 to 21 are controlled by the communication device 29. Each charge / discharge amount is acquired from 24. Moreover, the system state quantity of each part in the system is acquired from the power system 10 (SP111).

  Next, based on the information acquired in SP111, the control amount calculation unit 311 calculates the total control amount (charge / discharge amount) by all the secondary batteries necessary for controlling the power system 10 (SP112).

  In the distribution amount calculation unit 313, the total charge / discharge amount calculated by the control amount calculation unit 311 is taken into account by the control capacity of each of the secondary batteries 21 to 24 stored in the storage unit 312, and further the storage unit 312. Is calculated in accordance with the distribution method stored in the battery, thereby calculating the output adjustment amount for distribution to each of the secondary batteries 21 to 24 (SP113).

  These output adjustment amounts are transmitted from the communication device 29 toward the secondary batteries 21 to 24, respectively. Accordingly, the output of each of the secondary batteries 21 to 24 is controlled according to the output adjustment amount (SP114).

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, the power system 10 is controlled by controlling only the power source owned by the power company. However, by controlling the secondary batteries 21 to 24 held by the customer, the same effect as controlling the power source can be obtained, and the secondary batteries 21 to 21 held by the customer as well as the power source owned by the customer are obtained. Control up to 24 increases control margin, making it easier to control power distribution equipment than ever.

(Tenth embodiment)
The tenth embodiment of the present invention is a specific example of the ninth embodiment. Therefore, only the points different from the ninth embodiment will be described here. In the present embodiment, the distribution amount calculation unit 313 uses the remaining control power of each secondary battery 21 to 24 stored in the storage unit 312 to set the output adjustment amount of each secondary battery 21 to 24 by the following method. calculate.

That is, if the total control amount (charge / discharge amount) by each secondary battery 21 to 24 is X and the control remaining capacity of each secondary battery 21 to 24 stored in the storage unit 312 is A _i , each secondary battery The output adjustment amount (command value) X _i of the batteries 21 to 24 is as shown in the following equation (5).

X _i = A _i * X / ΣA _i (5)
Here, Σ means that the sum of all the secondary batteries 21 to 24 is taken. Finally, the respective output adjustment amounts of the secondary batteries 21 to 24 obtained according to the equation (5) are commanded to the secondary batteries 21 to 24.

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, the power system 10 is controlled by controlling only the power source owned by the power company. However, by distributing and controlling the output of the secondary batteries 21 to 24 owned by the consumers according to their capabilities, the same effect as controlling the power supply can be obtained, and not only the power supply owned by itself but also the demand Since the secondary batteries 21 to 24 owned by the house are controlled, the surplus control capacity is increased, and it is possible to control the secondary batteries 21 to 24 of the consumer fairly without any distribution bias to some batteries. Become.

(Eleventh embodiment)
The power system control device 30 to which the power system control method according to the eleventh embodiment of the present invention is applied, as shown in FIG. 18, the power system according to the ninth embodiment shown in FIG. An effect calculating unit 314 and a storage unit 315 are added to the power system control device 30 to which the control method is applied. Therefore, here, differences from the ninth embodiment will be described.

The effect calculation unit 314 calculates the control effect (e _i : the effect of the target control target by adjusting the output of the unit amount) for the power system 10 of each of the secondary batteries 21 to 24, and stores the calculation result in the storage unit 315. As a control effect, the sensitivity to the electric power system 10 of each secondary battery 21-24 corresponds, for example. In the case of load frequency control, the control effect is constant regardless of the installation location of the secondary battery, and the output adjustment amount itself is the control effect. That is, e _i = 1 (unit amount).

  The storage unit 315 stores the control effect calculated by the effect calculation unit 314.

The distribution amount calculation unit 313 stores the total charge / discharge amount X calculated by the control amount calculation unit 311 in the storage unit 315 and the control remaining capacity of each secondary battery 21 to 24 stored in the storage unit 312. In consideration of the control effect of each secondary battery 21-24, the distribution calculation for allocating to each secondary battery 21-24 according to the distribution method stored in the storage unit 312 is performed. 24 output adjustment amounts are obtained. That is, the distribution amount calculation unit 313 uses the control remaining power r _i of each of the secondary batteries 21 to 24 stored in the storage unit 312 and the control effect e _i stored in the storage unit 315 as follows ( 6) Find the output adjustment amount _{X i} of each of the secondary batteries 21 to 24 in accordance with the equation.
_{X i = e i * r i} * X / Σe i * r i = X * r i / Σr i ··· (6) formula
Here, Σ means that the sum of all controllable secondary batteries 21 to 24 is taken.

  Next, the operation in the case of performing load frequency control using the power system control device 30 according to the present embodiment configured as described above will be described using the flowchart shown in FIG.

  That is, when the load frequency control of the power system 10 is performed by controlling the secondary batteries 21 to 24 by the power system control device 30 according to the present embodiment, first, the secondary battery is controlled by the communication device 29. Each charge / discharge amount is acquired from 21-24. Moreover, the system state quantity (for example, power transmission line tide and frequency) of each part in the system is acquired from the power system 10 (SP121).

  Then, the total control amount (charge / discharge amount) X by the secondary battery necessary for controlling the power system 10 is calculated from the system state quantity acquired in SP121 (SP122). Moreover, the control effect with respect to the electric power grid | system 10 of each secondary battery 21-24 is calculated by the effect calculating part 314, and the calculation result is memorize | stored in the memory | storage part 315 (SP123).

  Next, the distribution amount calculation unit 313 distributes the total charge / discharge amount X calculated by the control amount calculation unit 311 to each of the secondary batteries 21 to 24 according to the distribution method stored in the storage unit 312. Calculation is performed. In this distribution calculation, the control capacity of each secondary battery 21 to 24 stored in the storage unit 312 and the control effect of each secondary battery 21 to 24 stored in the storage unit 315 are considered ( SP124).

  These output adjustment amounts are transmitted from the communication device 29 toward the secondary batteries 21 to 24, respectively. Thereby, the output of each of the secondary batteries 21 to 24 is controlled according to the output adjustment amount (SP125).

  Next, the operation in the case of performing overload elimination control using the power system control device 30 according to the present embodiment configured as described above will be described using the flowchart shown in FIG.

  That is, when overload elimination control of the power system 10 is performed by controlling the secondary batteries 21 to 24 by the power system control device 30 according to the present embodiment, first, each secondary device is controlled by the communication device 29. The respective charge / discharge amounts are acquired from the batteries 21 to 24. Moreover, the system state quantity (for example, power transmission line tide and frequency) of each part in the system is acquired from the power system 10 (SP131). Then, the total control amount (charge / discharge amount) X by all the secondary batteries necessary for controlling the power system 10 is calculated in the control amount calculation unit 311 from the system state amount acquired in SP131 (SP132).

Further, the effect calculation unit 314 calculates the control effect e _{i of the} secondary batteries 21 to 24 for the power system 10, and the calculation result is stored in the storage unit 315 (SP133). In the case of overload elimination control, the control effect e _i of each secondary battery 21 to 24 on the power system 10 varies depending on the installation location of each secondary battery 21 to 24. This is performed, for example, by calculating the power flow sensitivity of the power transmission line 60 (the power flow change amount of the power transmission line 60 when the output of the secondary batteries 21 to 24 is changed by a unit amount).

Next, the allocation amount calculation unit 313, output adjustment of the control margin r _i is used, the secondary battery in order absolute control effect e _i is greater for each of the secondary batteries 21 to 24 stored in the storage unit 312 (command value) _{X i} and _{X i = r i (SP134)} , and repeats until the sum of e i * _{r i} reaches the control amount X required overload eliminated (SP135~SP138). Finally, the output adjustment amount X _i of each secondary battery obtained in this way is commanded to each of the secondary batteries 21 to 24 (SP139).

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, the power system 10 is controlled by controlling only the power source owned by the power company. However, by distributing and controlling the output of the secondary batteries 21 to 24 owned by the consumers according to their capacities and effects, the same effect as controlling the power supply can be obtained, and the customers possess Since the secondary battery with the maximum effect can be preferentially controlled with respect to the control target intended for the secondary batteries 21 to 24, the power distribution facility can be controlled with a minimum amount of adjustment. Become.

Further, as a control effect e _i , a secondary battery having a predetermined threshold value or less is not controlled, so that it is possible to avoid control of a secondary battery having a small control effect e _i . In particular, although the control effect e _i is small, relative to the control margin is large secondary battery, since the e i _* r _i increases, can avoid the possibility that a large adjustment amount is distributed, with more Effective control is possible.

(Twelfth embodiment)
The power system control apparatus 30 to which the power system control method according to the twelfth embodiment of the present invention is applied is, as shown in FIG. 21, shown in FIG. 21, the power system according to the ninth embodiment shown in FIG. The storage unit 316 is added to the power system control device 30 to which the control method is applied. Therefore, here, differences from the ninth embodiment will be described.

  The storage unit 316 stores control priorities of the secondary batteries 21 to 24.

  The distribution amount calculation unit 313 calculates the output adjustment amount of each of the secondary batteries 21 to 24, and the total charge / discharge amount calculated by the control amount calculation unit 311 and each secondary battery stored in the storage unit 312. Each secondary battery according to the distribution method stored in the storage unit 312 in consideration of the control priority of the secondary batteries 21 to 24 stored in the storage unit 316 in addition to the remaining control capacity of 21 to 24 The distribution calculation for allocating to 21-24 is performed, and the output adjustment amount with respect to each secondary battery 21-24 is calculated.

  Next, the operation of power system control device 30 according to the present embodiment configured as described above will be described using the flowchart shown in FIG.

  That is, when each secondary battery 21 to 24 is controlled by the power system control device 30 according to the present embodiment, the charge / discharge amount is first acquired from each secondary battery 21 to 24 by the communication device 29. Is done. Moreover, the system state quantity (for example, power transmission line tide and frequency) of each part in the system is acquired from the power system 10 (SP141). Then, the total control amount (charge / discharge amount) X by the secondary battery necessary for controlling the power system 10 is calculated in the control amount calculation unit 311 from the system state amount acquired in SP141 (SP142).

  Next, in addition to the total charge / discharge amount calculated by the control amount calculation unit 311 by the distribution amount calculation unit 313 and the remaining control capacity of each secondary battery 21 to 24 stored in the storage unit 312, the storage unit The control priority of each secondary battery 21-24 memorize | stored in 316 is considered, and the allocation calculation for allocating to each secondary battery 21-24 according to the allocation method stored in the memory | storage part 312 is performed ( SP143). In this case, for the target control, the output with the full control capacity stored in the storage unit 312 is distributed from the secondary battery having a high control priority. This is repeated until the sum of the distribution amounts reaches the required total control amount (SP144 to SP147). And the output adjustment amount of each secondary battery 21-24 obtained in this way is instruct | indicated with respect to each secondary battery 21-24 (SP148).

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, the power system 10 is controlled by controlling only the power source owned by the power company. However, by allocating and controlling the output of the secondary batteries 21 to 24 owned by the consumers according to their capacities, it is possible to obtain the same effect as controlling the power source. Since the secondary batteries 21 to 24 are optimally controlled with respect to the target control target according to the priority order, that is, the cost for the control, for the convenience of the consumer who owns the secondary battery, it is inconvenient for the consumer. Can be minimized. Alternatively, the cost required for control can be minimized.

In addition, when the control priority is considered as the cost required to control the secondary batteries 21 to 24 from the power system control device 30, the necessary cost required to adjust the unit amount of the secondary battery on the customer side with c _i, instead of _e i * _{r i} described in the eleventh _embodiment, by using the _{e i * r i * c i} , can control the predetermined target with minimum cost It becomes.
(Thirteenth embodiment)
The power system control device 30 to which the power system control method according to the thirteenth embodiment of the present invention is applied is, as shown in FIG. 23, a power system according to the ninth embodiment shown in FIG. The power system control device 30 to which the control method is applied has a configuration in which a control surplus power calculation unit 317, a storage unit 318, and an overload surplus power calculation unit 319 are added. Therefore, here, differences from the ninth embodiment will be described.

  The control surplus power calculation unit 317 calculates the sum of the control surplus powers of the secondary batteries 21 to 24 using the control surplus power of the secondary batteries 21 to 24 stored in the storage unit 312.

  The storage unit 318 stores, for each of the secondary batteries 21 to 24, for example, data indicating the relationship between the control remaining capacity and the operable time during overload operation as illustrated in FIG.

  The overload remaining power calculation unit 319 calculates the sum of the control remaining power during the overload operation stored in the storage unit 318 for each of the secondary batteries 21 to 24.

  The distribution amount calculation unit 313 performs output distribution calculation of each of the secondary batteries 21 to 24 using information from the control amount calculation unit 311, the control surplus power calculation unit 317, and the overload surplus power calculation unit 319, and each secondary battery. The output adjustment amount for 21 to 24 is determined.

  Next, the operation of power system control device 30 according to the present embodiment configured as described above will be described using the flowchart shown in FIG.

  That is, when each secondary battery 21 to 24 is controlled by the power system control device 30 according to the present embodiment, the charge / discharge amount is first acquired from each secondary battery 21 to 24 by the communication device 29. Is done. Moreover, the system state quantity (for example, power transmission line tide and frequency) of each part in the system is acquired from the power system 10 (SP151). Then, the total control amount (charge / discharge amount) X by the secondary battery necessary for controlling the power system 10 is calculated from the system state quantity acquired in SP 151 (SP152).

  Further, the remaining control capacity of each of the secondary batteries 21 to 24 stored in the storage unit 312 is acquired by the remaining control capacity calculation unit 317 (SP153). And the total of the control remaining power at the time of rated operation is calculated using the control remaining power (SP154).

  Thereafter, in the distribution amount calculation unit 313, the total control amount calculated in SP152 is compared with the control surplus power during rated operation calculated in SP154. When the total control amount calculated in SP152 is not larger than the control surplus power at the rated operation calculated in SP154 (SP155: No), the total control amount is calculated by the overload surplus power calculation unit 319. Is compared with the i-fold overload control remaining power (SP156).

  On the other hand, in SP157, the data indicating the relationship between the control surplus power during overload operation and the drivable time stored in the storage unit 318 is used by the overload surplus power calculation unit 319 to secure a necessary total control amount. The sum of the control surplus power during i-times overload operation (i = 2, 3,... N) is calculated.

  Therefore, in the processing of SP156 performed by the distribution amount calculation unit 313, the total control amount calculated in SP152 is first compared with the total control remaining power calculated in SP157 during double overload operation (i = 2). Is done. Then, when the total control amount is smaller than the control remaining capacity at the time of double overload operation (SP156: Yes), the process proceeds to SP158. On the other hand, if it is not small (SP156: No), the process proceeds to SP157, where the overload surplus calculation unit 319 calculates the sum of the control surplus power during triple overload operation (i = 3) where i is incremented from 2 to 3. Is done. Then, at SP156, the total control amount calculated at SP152 is compared with the total control surplus at the triple load operation (i = 3) calculated at SP157. In this way, by repeating the processing of SP156 and SP157 until the sum of the overload control surplus becomes larger than the total control amount, it is determined how many times overload operation is performed.

  Thereafter, the distribution amount calculation unit 313 performs output distribution calculation for each of the secondary batteries 21 to 24 according to the overload operation condition (SP158). And the output adjustment amount of each secondary battery 21-24 determined by this output distribution calculation is commanded with respect to each secondary battery 21-24 (SP159).

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, the power system 10 is controlled by controlling only the power source owned by the power company. However, by distributing and controlling the output of the secondary batteries 21 to 24 owned by the consumers according to their capabilities, the same effect as controlling the power supply can be obtained. In addition, when the required control amount cannot be obtained only by rated operation of the secondary batteries 21 to 24 held by the customer, output adjustment is performed in consideration of overload operation, so that it is flexible with respect to the target control target. It becomes possible to control.

  In the power system control device to which the power system control method shown in the ninth to twelfth embodiments is applied, the total control capacity of all the secondary batteries 21 to 24 is less than the total control amount. In either configuration, the output command value exceeds the control margin. When such an output command value is obtained, only the secondary battery is overloaded. As a result, the necessary total control amount can be ensured, and an effect of eliminating unnecessary overload operation can be obtained.

(Fourteenth embodiment)
The power system control device 30 to which the power system control method according to the fourteenth embodiment of the present invention is applied has a configuration example as shown in FIG. 26, and the power system according to the ninth embodiment shown in FIG. The power system control device 30 to which the control method is applied has a configuration in which a storage unit 320 and a calculation unit 321 are added. Therefore, here, differences from the ninth embodiment will be described.

  Similarly to the storage unit 318 illustrated in FIG. 23, the storage unit 320 is a data that indicates the relationship between the control surplus capacity and the drivable time during overload operation as illustrated in FIG. 24, for each secondary battery 21 to 24. Is remembered.

  The calculation unit 321 compares the output distribution calculation result for each of the secondary batteries 21 to 24 made by the distribution amount calculation unit 313 with the data stored in the storage unit 320, and outputs the maximum operation continuation time. Calculate the adjustment amount.

  Next, the operation of power system control device 30 according to the present embodiment configured as described above will be described using the flowchart shown in FIG.

  That is, when the power system 10 is controlled by controlling the secondary batteries 21 to 24 by the power system control device 30 according to the present embodiment, first, the secondary batteries 21 to 21 are controlled by the communication device 29. Each charge / discharge amount is acquired from 24. Moreover, the system state quantity of each part in the system is acquired from the power system 10 (SP161).

  Next, based on the information acquired in SP161, the control amount calculation unit 311 calculates the total control amount by the secondary battery necessary for controlling the power system 10 (SP162).

  In the distribution amount calculation unit 313, the total charge / discharge amount calculated by the control amount calculation unit 311 takes into account the control capacity of each of the secondary batteries 21 to 24 stored in the storage unit 312, and further stores the storage unit 312. Are calculated in accordance with the distribution method stored in the battery, the outputs for distribution to the respective secondary batteries 21 to 24 are calculated (SP163), and the control of the secondary batteries 21 to 24 at the rated operation is performed. The amount exceeding the surplus power is calculated (S164).

  Next, the calculation unit 321 uses the calculation results of SP163 and SP164, and the data of the control surplus capacity and the drivable time at the time of overload operation (operation more than double rated) stored in the storage unit 320. The distribution output value is corrected as follows.

  That is, first, a secondary battery that exceeds the control surplus capacity during rated operation is selected (S165). Next, all or part of the output excess amount of the secondary battery having the largest distributed output exceeding the rated operation is allocated to the secondary battery having the longest overload operation duration (S166). Further, the operation state of the secondary battery is changed to the overload operation state, and is corrected as the control surplus is allocated (SP167). If the excess amount is likely to exist (SP168: Yes), the process returns to SP166. If the excess amount is not likely to exist (SP168: No), the process proceeds to SP169.

  In SP169, for example, a secondary battery that is operated at a double rating is tripled, that is, up to the surplus power that can be handled by the overload operation one level above, and the allocated output can be handled only by this overload operation. If not possible (SP169: No), the output is assigned to the secondary battery with the next longest duration (SP170). In addition, when the overload duration time of its own secondary battery is the longest, this secondary battery is handled by overload operation on its own one.

  In this way, when the excess amount of all the secondary batteries becomes zero in SP169 (SP169: Yes), the distribution calculation ends (SP171). Based on the result of the distribution calculation, output adjustment amounts for distribution to the secondary batteries 21 to 24 are determined, and the outputs of the secondary batteries 21 to 24 are controlled according to the output adjustment amounts. (SP172).

  Next, the output adjustment method as described above is performed using three secondary batteries (secondary battery A, secondary battery B, and secondary battery C) having the relationship between the control remaining capacity and the operation duration as shown in FIG. ) Is specifically described as an example.

As a precondition, the required total control amount is 120, and the distribution amount calculation unit 313 uses distribution values used for the rated operating capacities of the secondary battery A, the secondary battery B, and the secondary battery C to be 60 each. , 30, and 30. Considering the rated operation, 40, 20, and 20 respectively exceed the control margin in the rated operation.
Therefore, the largest distribution amount of the secondary battery A is covered by overload operation. The longest duration in the overload operation is the double rated operation of the secondary battery A. Therefore, the secondary battery A is set to a double rated operation, and 30 of 40 are distributed with a double rating. At this time, the control surplus capacity of the secondary battery A with the double rating is corrected to 0, and the control surplus capacity of the triple rating to 30. Further, the shortage of 10 is distributed by the double rated operation of the secondary battery B having the next long duration. As a result, the control surplus capacity of the secondary battery B is 10 at the double rating and 30 at the triple rating.

  Next, 20 which is insufficient in the secondary battery B is dealt with by overload operation. The secondary battery having the longest duration is twice the rated operation of the secondary battery B, and the remaining power at that time is 10. Therefore, 10 corresponds to the double rating of the secondary battery B. At this time, the control margin of the secondary rating of the secondary battery B is 0, and the control margin of the triple rating is 20. The shortage 10 is shared by the triple rated operation of the secondary battery A having the next long duration. As a result, the control margin of the triple rating of the secondary battery A is 20.

  Furthermore, 20 which is insufficient in the remaining secondary battery C is dealt with by overload operation. The control remaining power of 20 is shared by the triple rated operation of the secondary battery A having the longest duration, and as a result, all necessary control amounts are distributed.

  That is, with respect to the required total control amount 120, the secondary battery A is allocated 80 at the triple rated operation, the secondary battery B is allocated 30 at the double rated operation, and the secondary battery C is allocated 10 at the rated operation. Thus, the operation continuation time at this time is 1 hour.

  If all the secondary batteries are simply subjected to the same overload operation, only a control amount of 115 can be secured in the double rated operation. For this reason, for example, when the secondary battery A having the longest duration in triple operation is operated at a triple rating, and the secondary battery B and the secondary battery C are operated at a double rating, the duration is 30 minutes. Will become shorter.

  As described above, according to the power system control device 30 to which the power system control method according to the present embodiment is applied, conventionally, the power system 10 is controlled by controlling only the power source owned by the power company. However, by allocating and controlling the output of the secondary batteries 21 to 24 owned by the consumers according to their capacities, it is possible to obtain the same effect as controlling the power source. When the required amount of control cannot be obtained by only the rated operation of the secondary batteries 21 to 24, it is possible to allocate the necessary total control amount to each secondary battery so as to maximize the operation duration in consideration of overload operation. Since there is an effect, it becomes possible to control the system as long as possible.

  The best mode for carrying out the present invention has been described above with reference to the accompanying drawings. As an extension of the above-described effects achieved by the present invention, the maximum demand of the customer is further suppressed, or the secondary battery is charged using electricity with a low late-night electricity charge. However, it is possible to contribute to various electric power systems by leveling demand by discharging in an expensive daytime or supplying surplus power to the electric power system.

  Note that the present invention is not limited to the configurations described in the above embodiments. Within the scope of the invented technical idea of the scope of claims, a person skilled in the art can conceive of various changes and modifications. The technical scope of the present invention is also applicable to these changes and modifications. It is understood that it belongs to.

The block diagram which shows the structural example of the electric power system controlled by the electric power system control apparatus to which the electric power system control method which concerns on 1st Embodiment is applied. The block diagram which shows the example of application of the electric power system control apparatus to which the electric power system control method which concerns on 1st Embodiment is applied. The flowchart which shows operation | movement of the control function of the electric power grid control apparatus which concerns on 1st Embodiment. The flowchart which shows operation | movement of the planning function of the electric power system control apparatus which concerns on 1st Embodiment. The block diagram which shows the example of application of the electric power system control apparatus to which the electric power system control method which concerns on 2nd Embodiment is applied. The flowchart which shows operation | movement of the reliability operation planning function of the electric power grid control apparatus which concerns on 2nd Embodiment. The flowchart which shows the detailed process of reliability management plan calculation in FIG. The block diagram which shows the application example of the power system control apparatus to which the power system control method which concerns on 3rd Embodiment is applied. The flowchart which shows operation | movement of the reliability operation control function of the electric power grid control apparatus which concerns on 3rd Embodiment. The block diagram which shows the example of application of the electric power system control apparatus to which the electric power system control method which concerns on 4th Embodiment is applied. The flowchart which shows operation | movement of the overload sequential suppression function of the electric power grid control apparatus which concerns on 4th Embodiment. The block diagram which shows the example of application of the power system control apparatus to which the power system control method which concerns on 5th Embodiment is applied. The flowchart which shows operation | movement of the flow coefficient preparation function in 5th Embodiment, and an overload immediate suppression function. The flowchart which shows an example of the calculation method (loss mini calculation) which makes the power transmission loss of a power transmission line the minimum. The block diagram which shows the structural example of the electric power system controlled by the electric power system control apparatus to which the electric power system control method which concerns on 9th Embodiment is applied. The block diagram which shows the application example of the power system control apparatus to which the power system control method which concerns on 9th Embodiment is applied. The flowchart which shows operation | movement of the electric power grid control apparatus which concerns on 9th Embodiment. The block diagram which shows the example of application of the electric power system control apparatus to which the electric power system control method which concerns on 11th Embodiment is applied. The flowchart which shows operation | movement in the case of performing load frequency control using the electric power grid control apparatus which concerns on 11th Embodiment. The flowchart which shows operation | movement in the case of performing overload elimination control using the electric power grid control apparatus which concerns on 11th Embodiment. The block diagram which shows the application example of the power system control apparatus to which the power system control method which concerns on 12th Embodiment is applied. The flowchart which shows operation | movement of the electric power grid control apparatus which concerns on 12th Embodiment. The block diagram which shows the application example of the power system control apparatus to which the power system control method which concerns on 13th Embodiment is applied. The figure which shows an example of the data which show the relationship between the control surplus at the time of an overload driving | operation, and driving | operation possible time. The flowchart which shows operation | movement of the electric power grid control apparatus which concerns on 13th Embodiment. The block diagram which shows the application example of the power system control apparatus to which the power system control method which concerns on 13th Embodiment is applied. The flowchart which shows operation | movement of the electric power grid control apparatus which concerns on 14th Embodiment. The figure which shows an example of the data which show the relationship between the control surplus capacity of a secondary battery, and driving | operation continuation time. The figure which shows the example of the daily demand curve in a consumer. The figure which shows an example of the demand curve of the day when the maximum electric power exceeded contract electric power. The block diagram which shows the control method of the secondary battery by a prior art. The figure which shows the output example of a secondary battery. The figure which shows an example of the state which suppressed the output fluctuation by the secondary battery. The figure which shows the output example of a secondary battery. The figure for demonstrating the contract electric power change by introduction of a secondary battery. The figure which shows the output characteristic of a secondary battery. The figure for demonstrating the potential of a secondary battery. The block diagram which shows the structural example of a general electric power grid | system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Secondary battery, 2 ... Control apparatus, 3 ... Power receiving end, 5 ... Distribution system, 10 ... Electric power system, 11-15 ... Substation, 16 ... Thermal power plant, 17 ... Hydroelectric power plant, 18 ... Nuclear power plant 21-24 ... secondary battery, 25 ... switch, 26 ... section switch, 27 ... distribution line, 29 ... communication device, 30 ... power system controller, 31 ... control function, 32 ... planning function, 33 ... trust Operation plan function, 34 ... reliability operation control function, 40 ... secondary battery control system, 40a ... scheduled operation schedule database, 41 ... circuit breaker, 42 ... detector, 43 ... DC / AC converter, 44 ... secondary battery 50 ... Central power supply command station, 51 ... Overload sequential suppression function, 52 ... Overload immediate suppression function, 54 ... Flow coefficient creation function, 60 ... Transmission line, 61-64 ... Consumer, 301 ... Acquisition unit, 302 ... Determination unit, 303... Control unit, 30 Display unit 305 System condition calculation unit 311 Control amount calculation unit 312, 315, 316, 318, 320 Storage unit 313 Distribution amount calculation unit 314 Effect calculation unit 317 Control surplus calculation unit 319 ... Overload surplus calculation unit, 321 ... Calculation unit

Claims (22)

The power system is equipped with a secondary battery that is connected to a power system that supplies power to the consumer and charges and discharges for the consumer. A method for performing control or system control,
Obtaining the charge / discharge capacity of the secondary battery from the secondary battery;
Determining the operation schedule of the secondary battery or the charge / discharge amount of the secondary battery using the acquired charge / discharge capacity;
A power system control method comprising: controlling the secondary battery based on the determined operation schedule or charge / discharge amount. In the electric power system control method according to claim 1,
If the determined charge / discharge amount exceeds the current charge / discharge capacity of the secondary battery, an insufficient amount that is a value obtained by subtracting the current charge / discharge amount from the determined charge / discharge amount is determined. An electric power system control method further comprising displaying. In the electric power system control method according to claim 1 or 2,
When the passing power of the transformer of the distribution substation provided in the power system is likely to exceed a predetermined allowable value,
Obtaining a predetermined scheduled operation schedule of the secondary battery from the secondary battery;
Based on the acquired charge / discharge capacity and the acquired scheduled operation schedule, determining the operation schedule so as to suppress the power passing through the transformer in consideration of the charge / discharge amount by the secondary battery; A power system control method further comprising: In the electric power system control method according to claim 3,
Based on the acquired charge / discharge capability, creating a control command for controlling the secondary battery so as to suppress the power passing through the transformer in consideration of the charge / discharge amount by the secondary battery;
A power system control method further comprising controlling a charge / discharge amount of the secondary battery based on the created control command. In the electric power system control method of Claim 3 or Claim 4,
Obtaining a charge amount of the secondary battery from the secondary battery;
Based on the acquired charge amount and the scheduled operation schedule, or the acquired charge / discharge capacity, calculating a system condition that minimizes transmission loss of the power system;
Determining the operation schedule based on the system condition and the scheduled operation schedule, or determining the charge / discharge amount of the secondary battery based on the system condition and the charge / discharge capacity; System control method. In the electric power system control method according to any one of claims 3 to 5,
When the passing power of the distribution line provided in the power system is likely to exceed a predetermined allowable value, the charge / discharge amount by the secondary battery is calculated based on the charge / discharge capability and the scheduled operation schedule. A power system control method further comprising: determining an operation schedule of the secondary battery that suppresses passing power of the distribution line in consideration of the charge / discharge amount. In the electric power system control method according to claim 1,
Estimating the power at a specific point existing between the power system and the consumer from the power at the consumer supplied from the power system using a predetermined current correlation equation;
If the estimated power is likely to exceed a predetermined allowable value for the specific point, the secondary battery is discharged so that the power at the specific point satisfies the allowable value; Power system control method provided. In the electric power system control method according to claim 7,
When discharging the secondary battery, a sensitivity constant representing sensitivity of the estimated power at the specific point and the charge / discharge amount of the secondary battery with respect to the power at the specific point is used. A power system control method for determining a charge / discharge amount and discharging the secondary battery according to the determined charge / discharge amount. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A way to
Calculating the total charge / discharge amount of all secondary batteries required for controlling the power system;
Performing a distribution calculation for allocating the calculated total charge / discharge amount to each secondary battery according to a predetermined distribution method;
A power system control method comprising: controlling each of the secondary batteries based on a result of the distribution calculation. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A way to
Calculating the total charge / discharge amount of all secondary batteries required for controlling the power system;
Storing the charge / discharge capacity of each secondary battery in a storage means;
Performing a distribution calculation for distributing the calculated total charge / discharge amount to each secondary battery based on the charge / discharge capacity stored in the storage means;
A power system control method comprising: controlling each of the secondary batteries based on a result of the distribution calculation. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A way to
Calculating the total charge / discharge amount of all secondary batteries required for controlling the power system;
Calculating the sensitivity of each secondary battery to the power system;
Performing a distribution calculation to distribute the calculated total charge / discharge amount to each of the secondary batteries according to the calculated sensitivity;
A power system control method comprising: controlling each of the secondary batteries based on a result of the distribution calculation. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A way to
Calculating the total charge / discharge amount of all secondary batteries required for controlling the power system;
Storing the charge / discharge capacity of each of the secondary batteries in a first storage means;
Storing a predetermined priority order for each of the secondary batteries in the second storage means;
Distributing the calculated total charge / discharge amount to the full charge / discharge capacity stored in the first storage unit preferentially from the secondary batteries having a high priority stored in the second storage unit. Allocating the total charge / discharge amount to each of the secondary batteries,
And controlling each of the secondary batteries based on the result of the distribution. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A way to
Calculating the total charge / discharge amount of all secondary batteries required for controlling the power system;
Storing the charge / discharge capacity of each of the secondary batteries in a first storage means;
Storing the charge / discharge capacity of each secondary battery during overload operation in a second storage means;
When the calculated total charge / discharge amount is larger than the total value of the charge / discharge capacity stored in the first storage unit, the total charge / discharge amount is stored in the first storage unit. Distributing to each secondary battery based on the charge / discharge capacity and the charge / discharge capacity at the time of overload operation stored in the second storage means;
And controlling each of the secondary batteries based on the result of the distribution. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A way to
Calculating the total charge / discharge amount of all secondary batteries required for controlling the power system;
Storing the charge / discharge capacity of each of the secondary batteries in a first storage means;
Storing the charge / discharge capacity and the duration of each secondary battery during overload operation in a second storage means;
When the calculated total charge / discharge amount is larger than the total value of the charge / discharge capacity stored in the first storage unit, the total charge / discharge amount is stored in the first storage unit. Based on the charge / discharge capacity, the charge / discharge capacity at the time of overload operation stored in the second storage means, and the duration thereof, distribution to each secondary battery so as to have the longest operation duration; ,
And controlling each of the secondary batteries based on the result of the distribution. The power system is equipped with a secondary battery that is connected to a power system that supplies power to the consumer and charges and discharges for the consumer. A device for performing control or system control,
Obtaining means for obtaining the charge / discharge capacity of the secondary battery from the secondary battery;
Determining means for determining the operation schedule of the secondary battery or the charge / discharge amount of the secondary battery using the charge / discharge capacity acquired by the acquiring means;
A power system control apparatus comprising: a control unit that controls the secondary battery based on an operation schedule or a charge / discharge amount determined by the determination unit. In the electric power system control device according to claim 15,
Estimating means for estimating power at a specific point existing between the power system and the consumer from power at the consumer supplied from the power system using a predetermined current correlation equation;
If the power estimated by the estimating means is likely to exceed a predetermined allowable value for the specific point, the secondary battery is discharged so that the power at the specific point satisfies the allowable value. A power system control device further comprising a discharge control means. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A device that performs
A total calculation means for calculating a total charge / discharge amount by all the secondary batteries necessary for controlling the power system;
Distribution calculation means for performing distribution calculation for distributing the total charge / discharge amount calculated by the total calculation means to each secondary battery according to a predetermined distribution method;
A power system control apparatus comprising: control means for controlling each of the secondary batteries based on a result of distribution calculation performed by the distribution calculation means. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A device that performs
A total calculation means for calculating a total charge / discharge amount by all the secondary batteries necessary for controlling the power system;
Storage means for storing the charge / discharge capacity of each secondary battery;
Distribution calculation means for performing distribution calculation for distributing the total charge / discharge amount calculated by the total calculation means to each secondary battery based on the charge / discharge capacity stored in the storage means;
A power system control device comprising control means for controlling each of the secondary batteries based on a result of distribution calculation by the distribution calculation means. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A device that performs
A total calculation means for calculating a total charge / discharge amount by all the secondary batteries necessary for controlling the power system;
Sensitivity calculating means for calculating the sensitivity of each secondary battery to the power system;
Distribution calculation means for performing distribution calculation for distributing the total charge / discharge amount calculated by the total calculation means to each of the secondary batteries according to the sensitivity calculated by the sensitivity calculation means;
A power system control device comprising control means for controlling each of the secondary batteries based on a result of distribution calculation by the distribution calculation means. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A device that performs
A total calculation means for calculating a total charge / discharge amount by all the secondary batteries necessary for controlling the power system;
First storage means for storing the charge / discharge capacity of each secondary battery;
Second storage means for storing a predetermined priority order for each of the secondary batteries;
The total charge / discharge amount calculated by the total calculation means is preferentially filled with the charge / discharge capacity stored in the first storage means preferentially from the secondary battery having a high priority stored in the second storage means. Distributing means for distributing the total charge / discharge amount to each of the secondary batteries,
A power system control device comprising control means for controlling each of the secondary batteries based on a result of distribution by the distribution means. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A device that performs
A total calculation means for calculating a total charge / discharge amount by all the secondary batteries necessary for controlling the power system;
First storage means for storing the charge / discharge capacity of each secondary battery;
Second storage means for storing the charge / discharge capacity of each secondary battery during overload operation;
When the total charge / discharge amount calculated by the total calculation unit is larger than the total value of the charge / discharge capacity stored in the first storage unit, the total charge / discharge amount is calculated as the first storage unit. Distribution means for allocating to each secondary battery based on the charge / discharge capacity stored in the second storage means and the charge / discharge capacity during overload operation stored in the second storage means;
A power system control device comprising: control means for controlling each of the secondary batteries based on a result of distribution made by the distribution means. The power system is controlled by using a secondary battery that is provided on the consumer side that uses power and is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A device that performs
A total calculation means for calculating a total charge / discharge amount by all the secondary batteries necessary for controlling the power system;
First storage means for storing the charge / discharge capacity of each secondary battery;
Second storage means for storing the charge / discharge capacity and the duration of each secondary battery during overload operation;
When the total charge / discharge amount calculated by the total calculation unit is larger than the total value of the charge / discharge capacity stored in the first storage unit, the total charge / discharge amount is calculated as the first storage unit. On the basis of the charge / discharge capacity stored in the second storage means, the charge / discharge capacity at the time of overload operation stored in the second storage means, and the duration thereof, so that each secondary battery has the longest operation duration. A distribution means to distribute;
A power system control device comprising: control means for controlling each of the secondary batteries based on a result of distribution made by the distribution means.

Images