JP2016167913A - Power supply system and power supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system which is prevented from stopping power supply to a load due to abnormal stop, by suppressing overcharge or overdischarge of a storage battery due to variation of the power generated from a solar power generator, when there is no power supply from a commercial system, and power is supplied to the load by the solar power generator and storage battery.SOLUTION: A system for supplying power to a load connected with a system in an autonomous operation range, when there is no power supply from a commercial system includes a storage battery and a solar power generator connected with the system, a difference arithmetic unit for obtaining the difference between a prediction value of power generated from the solar power generator and a prediction value of power consumption of the load, a remaining mount of battery prediction unit for obtaining the prediction value of the remaining mount of battery that is the prediction value of the remaining mount of battery in the control period of a control object, from the difference and control period and the remaining mount of the storage battery, and an operation management unit for controlling the power generation and power consumption in the control period, by the comparison results of the prediction value of the remaining mount of battery and a preset target value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system and a power supply method for supplying power to a load device.

In recent years, for the purpose of reducing CO ₂ (carbon dioxide), efforts have been actively made on technologies that utilize electric power by natural energy power generation typified by solar power generation and wind power generation.
As a technique for effectively utilizing the natural energy power generation described above, in a normal time when the commercial system supplies predetermined power, the natural energy generator is linked to the commercial system to supply power.
On the other hand, if power supply from this commercial system is lost due to an abnormality such as a power failure in the commercial system, the power supply for business continuity for BCP (business continuity plan) Used for power supply.

As a technique using the natural energy power generation described above, for example, by installing a solar power generator and a storage battery, the output fluctuation of the generated power of the solar power generator is compensated by the storage battery at the time of power failure of the commercial system, and the load There is a power conditioner for solar power generation that supplies AC power to the power source (see, for example, Patent Document 1).
In addition, it has a power system in a facility with a solar power generator and a storage battery, and in the event of a power outage in a commercial system, a self-supporting type that supplies AC power to the load with a storage battery and a solar power generator in the event of a power outage There exists an operation control system (for example, refer to patent documents 2).

Japanese Patent Laid-Open No. 2002-354677 JP 2011-010412 A

However, Patent Document 1 and Patent Document 2 do not supply power from a commercial system, and when performing a self-sustained operation with a storage battery and a solar power generator, the remaining battery level (SOC: state of charge) of the storage battery. ) Becomes unstable, and the self-sustained operation control is hindered by fluctuations in the amount of power generated by the photovoltaic generator.
That is, when the amount of generated power that is the amount of power generated by the solar power generator is larger than the amount of power consumed by the load, surplus power that is the difference between the amount of generated power and the amount of consumed power is generated. The storage battery is charged by this surplus power, but when the remaining battery capacity increases and reaches the upper limit value, charging cannot be performed, the power supply system stops abnormally, and power is not supplied to the load. .

  In addition, when the amount of power generated by the solar power generator is smaller than the amount of power consumed by the load, insufficient power that is the difference between the amount of power consumed and the amount of power generated is generated. This insufficient power is discharged from the storage battery, but when the remaining battery level decreases and reaches the lower limit value, the discharge cannot be performed and the power supply system abnormally stops, and the power is not supplied to the load. .

  The present invention has been made in view of such circumstances, and there is no power supply from a commercial system, and when power is supplied to a load by a solar power generator and a storage battery, due to fluctuations in power generated by the solar power generator. Suppresses the storage battery's remaining charge from excessively rising, resulting in an overcharged state, or the storage battery's remaining charge remaining to a level where it cannot be discharged. An object of the present invention is to provide a power supply system and a power supply method that prevent the situation from being impossible.

  The present invention has been made to solve the above-described problems, and the power supply system of the present invention supplies power to a load connected to the power system in the autonomous operation range when there is no power supply from the commercial system. A power supply system, a storage battery connected to the power system, a solar power generator connected to the power system, a generated power predicted value that is a predicted value of the generated power of the solar power generator, and A difference calculation unit that obtains a difference from a predicted power consumption value that is a predicted value of power consumption of the load, and the remaining battery level of the storage battery in the control cycle to be controlled from the difference, the control cycle, and the remaining battery level of the storage battery. A battery remaining amount predicting unit that obtains a battery remaining amount predicted value that is a predicted value of the amount, and compares the battery remaining amount predicted value with a preset target value, and based on the comparison result, the power generation in the control cycle Power and Characterized in that it comprises a driving control section for controlling the serial power consumption.

  In the power supply system of the present invention, the operation management unit sets the target value as the maximum remaining capacity value in the specification of the storage battery when the remaining battery capacity in the control cycle exceeds a preset upper limit value. When the remaining amount predicted value exceeds the target value, the generated power of the solar power generator in the control cycle is reduced, while the battery remaining amount in the control cycle falls below a preset lower limit value, The target value is set as the remaining capacity minimum value in the specification of the storage battery, and when the predicted battery remaining value is lower than the target value, the power consumption of the load in the control cycle is reduced.

  In the power supply system of the present invention, the battery remaining power predicting unit subtracts the power consumption predicted value from the generated power predicted value, and the subtraction result is used as the difference. The battery remaining power prediction value, which is the battery remaining power of the storage battery in the next control cycle, is obtained by adding the multiplication result of the difference and the control cycle to the battery remaining power of the storage battery. To do.

  The power supply method of the present invention supplies power from a storage battery and a solar power generator provided in the power system to a load connected to the power system in the independent operation range when there is no power supply from a commercial system. This is a power supply method, and the difference calculation unit obtains a difference between a generated power predicted value that is a predicted value of the generated power of the solar power generator and a predicted power consumption value that is a predicted value of the power consumption of the load. A calculation process and a battery remaining amount predicting unit calculates a battery remaining amount predicted value that is a predicted value of the battery remaining amount of the storage battery in the control cycle to be controlled from the difference, the control cycle, and the battery remaining amount of the storage battery. The battery remaining amount prediction process to be obtained and the operation management unit compare the battery remaining amount predicted value with a preset target value, and control the generated power and the consumed power in the control cycle based on the comparison result. Operation management process to be performed Characterized in that it has a.

  According to this invention, when there is no power supply from the commercial system and power is supplied to the load by the solar power generator and the storage battery, the difference between the power generated by the solar power generator and the power consumption of the load, and the current cycle Power generation power of the solar generator by predicting from the remaining battery capacity of the storage battery in the battery, comparing the target value set in advance in units of control cycles, and adjusting the generated power or power consumption based on the comparison result It is possible to prevent the storage battery from being overcharged or to a state where the remaining amount of electricity is reduced to the extent that it cannot be discharged due to fluctuations in the system, preventing the system from stopping abnormally and preventing power from being supplied to the load. be able to.

It is a schematic block diagram which shows the structural example of the electric power supply system by the 1st Embodiment of this invention. It is a figure explaining the demand time period which is a control period of the electric power supply system. It is a flowchart which shows the operation example in the state which the commercial system 500 becomes abnormal and the electric power supply system 1 by 1st Embodiment is performing the independent operation. It is a flowchart which shows the operation example in the state which the commercial system 500 becomes abnormal and the electric power supply system 1 by 2nd Embodiment is performing the independent operation.

<First Embodiment>
Hereinafter, a power supply system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram showing a configuration example of a power supply system according to the first embodiment of the present invention.
In FIG. 1, a power supply system 1 includes a system linkage relay 200, a self-sustaining range circuit breaker 150, a facility system 50, a power conditioner 11, a power conditioner 12_1,..., A power conditioner 12_n (n is a natural number), a storage battery. 21, the solar power generator 22_1, ..., the solar power generator 22_n, the power consumption predicting unit 13, the generated power predicting unit 14, the difference calculating unit 15, the battery remaining power predicting unit 16, and the operation managing unit 17, and the load 300 In contrast, power is supplied.

Further, in the power supply system 1, when the self-sustained range circuit breaker 150 is on, the in-facility system 50 is electrically connected to the commercial system 500, while the self-supporting range circuit breaker 150 is off. The in-facility system 50 is electrically disconnected (opened) from the commercial system 500. Here, the grid interconnection relay 200 is configured so that when the power quality for the overvoltage, undervoltage, overfrequency, underfrequency, etc. of the AC power supplied from the commercial system 500 falls below a preset set value, An abnormal signal is output to the self-sustained range circuit breaker 150 and the operation management unit 17 as being abnormal.
The self-sustained range circuit breaker 150 is turned off when an abnormal signal is supplied from the system linkage relay 200, and is turned on when no abnormal signal is supplied from the system linkage relay 200.

  The power conditioner 11 is provided between the in-facility system 50 and the storage battery 21, and there is surplus power exceeding the power consumption of the load 300 in the in-facility system 50. The AC power of the system 50 is converted to DC to charge the storage battery 21. On the other hand, if the power in the facility system 50 is insufficient, the DC power of the storage battery 21 is converted to AC and the facility system 50 is charged. To discharge.

  Each of the power conditioners 12_1, ..., the power conditioners 12_n is provided between the in-facility system 50 and each of the solar power generators 22_1, ..., the solar power generators 22_n. ..., DC power generated by the solar power generator 22_n is converted into alternating current to supply power to the in-facility system 50.

When the commercial system 500 is normal, the self-supporting range circuit breaker 150 is in an on state, the in-facility system 50 is connected to the commercial system 500, and the storage battery 21, the solar power generator 22_1, ..., the solar power generator 22_n The power conditioner 11, the power conditioner 12_1,..., And the power conditioner 12_n are each in a mode in which the interconnection operation is controlled so that each of the power is connected to the commercial system 500.
On the other hand, when the commercial system 500 is abnormal, the self-sustaining range circuit breaker 150 is in an off state, the in-facility system 50 and the commercial system 500 are electrically disconnected, and the alternating current output from the power conditioner 11 of the storage battery 21 is output. The power conditioners 12_1,..., And the power conditioners 12_n are respectively connected so that the power from the solar power generators 22_1,. Is a mode for controlling the interconnection operation.

  Here, when an abnormal signal is supplied from the system linkage relay 200, the operation management unit 17 causes the power conditioner 11 to output an AC voltage having a reference frequency and voltage value to the in-facility system 50 to generate power. Set to the mode to supply. On the other hand, when the abnormal signal is not supplied from the system linkage relay 200, the operation management unit 17 sets the power conditioner 11 to the system interconnection to the AC voltage having the frequency in the supply power of the commercial system 500.

The power consumption prediction unit 13 is a power demand in the control cycle at a time point before the start of measurement of the actual value in the control cycle that is the control target of the actual value among a plurality of consecutive control cycles (demand time period). A predicted power consumption value that is a predicted value of the power consumption of the load) is calculated.
FIG. 2 is a diagram for explaining a demand time period (time width X) that is a control cycle of the power supply system 1. In FIG. 2, the time width of the demand time period is X, and each of the time T1, the time T2, the time T3, and the time T4 is a time when the control cycle starts.

  For example, in FIG. 2, the power consumption prediction unit 13 sets a time (for example, time T <b> 1-time T <b> 0 -Y) determined from time T <b> 1 when measurement in the demand time period between time T <b> 1 and time T <b> 2 is started. At the previous time point (time T0 + Y), a predicted power consumption value that is a predicted value of average demand power in the demand time period between time T1 and time T2 is calculated. Here, as a method of calculating the predicted power consumption value, for example, a method using a neural network model as disclosed in a patent document (Japanese Patent Laid-Open No. 2006-78009) can be applied. Here, Y is a time in minutes, for example. For example, the predicted power consumption is calculated by modeling the demand power according to the outside air temperature, humidity, wind speed, air volume, air conditioning operation time, day of the week, season, and the like. The calculation process of the predicted power consumption value by the power consumption prediction unit 13 is executed, for example, before each predetermined time period (for example, 3 to 5 minutes). For this reason, for example, if the demand time limit is 30 minutes, the power consumption prediction value calculation process by the power consumption prediction unit 13 is executed 48 times a day.

  The generated power prediction unit 14 is a predicted value of the generated power in the measurement target period at a time before the start of measurement of the actual value in the measurement target period that is the measurement target of the actual value among a plurality of continuous measurement periods. The predicted generated power value is calculated. For example, in FIG. 2, the generated power prediction unit 14 sets a time (for example, time T1−time T0−Y) determined from the time T1 when the measurement in the demand time period between the time T1 and the time T2 is started. At a previous time point (time T0 + Y), a predicted generated power value that is a predicted value of average generated power in the demand time period between time T1 and time T2 is calculated.

  Here, as a method for calculating the predicted power generation value, a method similar to that of the power consumption prediction unit 13 described above can be applied. For example, the generated power prediction value is calculated by modeling the generated power according to the amount of solar radiation, humidity, day of the week, and season in the weather forecast. The calculation process of the generated power prediction value by the generated power prediction unit 14 is executed at the same timing as the process in the power consumption prediction unit 13 before each fixed time (for example, 3 to 5 minutes), for example, for each successive demand period. The For this reason, for example, if the demand time limit is 30 minutes, the generated power predicted value calculation process by the generated power prediction unit 14 is executed 48 times a day.

The difference calculation unit 15 subtracts the predicted power consumption value from the predicted power generation value, and outputs the subtraction result as a difference to the battery remaining power prediction unit 16 and the operation management unit 17. Here, the difference becomes a positive value when the predicted power generation value is larger than the predicted power consumption value, and conversely, the difference becomes a negative value when the predicted power consumption value is larger than the predicted power generation value.
The remaining battery level prediction unit 16 adds the multiplication result obtained by multiplying the difference obtained by the difference calculation unit 15 and the control period to the remaining battery level of the storage battery 21 in the measured current control period, and adds the addition result to the remaining battery level. Output as quantity prediction value. Here, when the difference is a positive value, the estimated remaining battery level increases with respect to the remaining battery level. Conversely, when the difference is a negative value, the estimated remaining battery level decreases with respect to the remaining battery level. To do.

Whether the operation management unit 17 exceeds the preset upper limit target value (for example, the maximum remaining battery capacity in the specification of the storage battery 21 or an arbitrary first remaining battery capacity). Or the lower limit target value (for example, the minimum remaining battery level in the specification of the storage battery 21 or any second remaining battery level less than the first battery remaining level), or the upper limit target value and the lower limit target value. It is determined whether it is within the range. Each of the upper limit target value and the upper limit target value is set to, for example, a numerical value of 90% of the maximum battery remaining amount and a numerical value of 110% of the minimum battery remaining amount in the specification of the storage battery 21, respectively.
Here, as will be described later, when the predicted battery remaining amount of the storage battery 21 exceeds the upper limit value, the operation management unit 17 sets an upper limit target value (for example, the maximum battery remaining amount in the specification of the storage battery 21 or an arbitrary value). Control is performed to reduce the total power generated by the solar power generator 22_1 to the solar power generator 22_n so as not to exceed the first battery remaining amount).

On the other hand, when the predicted battery remaining value of the storage battery 21 is below the lower limit value, the operation management unit 17 sets the lower limit target value (for example, less than the minimum remaining battery level in the specification of the storage battery 21 or the first remaining battery level). Control is performed to reduce the power consumption of the load 300 so that it does not fall below the arbitrary second battery level. The operation management unit 17 does not control the solar power generator 22_1 to the solar power generator 22_n and the load 300 when the predicted battery remaining amount of the storage battery 21 is equal to or higher than the lower limit value and lower than the upper limit value.
Moreover, the operation management part 17 is the solar power generation which has stopped the electric power supply in the solar power generator 22_n from the solar power generator 22_1, when the battery remaining power estimated value of the storage battery 21 is less than a lower limit. The corresponding inverter is controlled so as to start the power supply from the machine. In addition, when the remaining battery level of the storage battery 21 exceeds the upper limit value, the operation management unit 17 performs control so as to start power supply to a load that stops power supply in the load 300.

  The operation management unit 17 subtracts the maximum remaining battery level from the estimated remaining battery level when performing control to reduce the total power generated by the photovoltaic generators 22_1 to 22_n, and calculates the subtraction result in the control cycle. Divide and output the result of division as the amount of power generation reduction. On the other hand, when the operation management unit 17 performs control to reduce the power consumption of the load 300, the operation management unit 17 subtracts the battery remaining amount prediction value from the minimum battery remaining amount, divides the subtraction result by the control period, and uses the division result as the power consumption. Output as a reduction amount.

  In addition, when the operation management unit 17 performs control to reduce the total power generated by the solar power generators 22_1 to 22_n, the total power generated by the solar power generators to be stopped is equal to or greater than the power generation reduction amount. Then, the supply of generated power from the solar power generator 22_1 to the solar power generator 22_n is stopped. The supply of generated power is stopped by a process of stopping the power conditioner corresponding to each solar power generator and stopping the supply of generated power from the solar power generator to the in-facility system 50. Moreover, in the solar power generator 22_1 to the solar power generator 22_n, the order of stopping is set in advance, and the operation management unit 17 generates power of the solar power generator whose power supply has been stopped in the set order. The power supply from the solar power generator is stopped until the total number of generators exceeds the generated power reduction amount.

  On the other hand, when performing the control for reducing the power consumption of the load 300, the operation management unit 17 reduces the power consumption of the load 300 so as to be equal to or greater than the power consumption reduction amount. Here, when the load 300 is composed of a plurality of loads, the order of stopping is set in advance in the order of lower importance, and the operation management unit 17 determines that the total power consumption of the loads to be stopped is the above power consumption. The load is stopped in the set order until the amount exceeds the reduction amount.

  Next, in this embodiment, the case where the commercial system 500 becomes abnormal and the power supply system 1 performs a self-sustained operation will be described below. FIG. 3 is a flowchart showing an operation example in a state where the commercial system 500 becomes abnormal and the power supply system 1 according to the first embodiment is performing a self-sustaining operation. Further, the processing of the flowchart of FIG. 3 shown below is performed according to a time (for example, time T1−time T0) determined from the time T1 when the measurement in the demand time period between the time T1 and the time T2 in FIG. 2 is started. -Y) At a previous time point (time T0 + Y), that is, at a predetermined set time in the demand time period immediately before the demand time period to be controlled.

Step S1:
Battery remaining capacity predicting unit 16, in the control period of the time T _n and the start time, the following is initiated at time T _{n + 1} control cycle upper limit remaining battery capacity of the storage battery 21 in (demand time) of the target value and the lower limit When the time _Tn + Y at which the determination process of solar power generation and load control to be suppressed within the target value is reached, the remaining battery level of the storage battery 21 is measured. Further, the battery remaining capacity prediction unit 16 outputs the measured battery remaining capacity to the operation management unit 17. Here, time T _n indicates the start time of the control cycle in which control is currently being performed. In addition, time T _{n + 1} indicates the start time of the control cycle next (immediately after) the control cycle (current control cycle) started at time T _n .

Step S2:
Next, the power consumption prediction unit 13 obtains a predicted power consumption value that is a predicted value of the load power consumption of the load 300 within the next control cycle (time range from time T _{n + 1} to time T _{n + 1} + X). Then, the power consumption prediction unit 13 outputs the calculated power consumption prediction value to the difference calculation unit 15. For example, X is a demand time period.

Step S3:
Next, the generated power prediction unit 14 uses the in-facility system in the photovoltaic generator 22_1 to the photovoltaic generator 22_n within the next (immediately after) control cycle (time range from time Tn _{+ 1} to time Tn _{+ 1} + X). A predicted generated power value that is a predicted value of the total generated power of the solar power generator that supplies power to 50 is obtained. Here, the generated power prediction unit 14 obtains a predicted value of the generated power of each of the solar power generators 22_n from the solar power generator 22_1, and adds the predicted value of the generated power of the operating solar power generator among them. Then, the addition result is used as the predicted power generation value.
Then, the generated power prediction unit 14 outputs the calculated generated power prediction value to the difference calculation unit 15.

Step S4:
Next, the difference calculation unit 15 subtracts the power consumption prediction value supplied from the power consumption prediction unit 13 from the power generation prediction value supplied from the power generation power prediction unit 14, and uses the subtraction result as the power generation power prediction value. The difference from the predicted power consumption value. The difference calculation unit 15 outputs the obtained difference to the operation management unit 17.
Then, the operation management unit 17 multiplies the difference supplied from the difference calculation unit 15 by the control period, adds the battery remaining amount supplied from the battery remaining amount prediction unit 16 to the multiplication result, and adds this The result is defined as a battery remaining capacity predicted value that is a predicted value of the remaining battery capacity of the storage battery 21 at the end of the next control period (control period started at time _{Tn + 1} ).

Next, the operation management unit 17 compares the calculated remaining battery level with a target value (for example, the maximum remaining battery level in the specification of the storage battery 21 or an arbitrary first remaining battery level).
At this time, if the predicted battery remaining value exceeds the target value (for example, the maximum remaining battery level in the specification of the storage battery 21 or an arbitrary first remaining battery level), the operation management unit 17 proceeds to step S5. Proceed.
On the other hand, when the predicted battery remaining value is equal to or less than the target value (for example, the maximum remaining battery level or any first remaining battery level in the specification of the storage battery 21), the operation management unit 17 advances the process to step S8.

Step S5:
Next, the operation management unit 17 subtracts a target value (for example, the maximum remaining battery level in the specification of the storage battery 21 or an arbitrary first remaining battery level) from the predicted remaining battery level, and divides the subtraction result by the control period. The division result is used as the amount of power generation reduction.

Step S6:
In the set order, the operation management unit 17 causes the solar power generator 22_1 to the solar power generator 22_n so that the sum of the power generators whose power supply has been stopped is equal to or greater than the generated power reduction amount. A solar power generator that stops the supply of generated power at the next control cycle time T _{n + 1} is set. And the operation management part 17 complete | finishes the process of a flowchart, and stops the electric power supply from the solar power generator set at the time of the next control cycle time _{Tn + 1} being started. In addition, the operation management unit 17 performs control so as to start power supply to a load in which power supply is stopped in the load 300, and ends the process.

Step S7:
Next, the operation management unit 17 obtains the estimated remaining battery level and the target value (for example, the minimum remaining battery level in the specification of the storage battery 21 or any second remaining battery level less than the first remaining battery level). Make a comparison.
At this time, the operation management unit 17 has a predicted remaining battery level lower than a target value (for example, a minimum remaining battery level in the specification of the storage battery 21 or an arbitrary second remaining battery level less than the first remaining battery level). If so, the process proceeds to step S8.
On the other hand, when the battery management predicted value is equal to or higher than the target value (for example, the minimum battery remaining in the specification of the storage battery 21 or any second battery remaining less than the first battery remaining), The process ends.

Step S8:
Next, the operation management unit 17 subtracts the battery remaining amount prediction value from the target value (for example, the minimum remaining battery amount in the specification of the storage battery 21 or the arbitrary second battery remaining amount less than the first battery remaining amount), The subtraction result is divided by the control cycle, and this division result is used as the power consumption reduction amount.

Step S9:
The operation management unit 17 sets the power consumption of the load 300 at the next control cycle time T _{n + 1} so that the power consumption to be reduced (reduced) in the load 300 is equal to or greater than the power consumption reduction amount. And the operation management part 17 complete | finishes the process of a flowchart, and operates the load 300 within the range of the power consumption set at the time of the next control cycle time _{Tn + 1} being started. Moreover, the operation management part 17 of the power conditioner corresponding to start the electric power supply from the solar power generator which has stopped the power supply among the solar power generators 22_1 to 22_n. Take control.

  As described above, according to the present embodiment, based on the predicted value of average demand power calculated by a neural network model or the like before the actual value of demand power within the control cycle (demand time period) is measured. Real-time DR processing can be performed. That is, after measuring the actual value of the demand power within the demand time limit as in the past, the DR processing time can be increased compared with the case where the estimated value of the average demand power is calculated and the DR processing is performed. The effect is increased. For example, conventionally, the DR process can be executed only after a certain time (time T1 + m0) after the actual value of demand power is acquired from the start time of the demand time period (time T1). According to the above, it is possible to start the DR process with high accuracy from the start point of the demand time period (time T1).

In the present embodiment, each of the power consumption prediction unit 13 and the generated power prediction unit 14 has shown an example in which a prediction value calculation process using a neural network model is performed every certain time before the demand time limit. Once a day, a predicted value for 24 hours for each demand time interval (X minutes) may be calculated and stored.
In addition, in the power supply system 1 described above, if only one solar power generator 22 is installed, the operation management unit 17 ″ reduces the generated power from the one solar power generator 22. When the power supply to the in-facility system 50 is stopped by the conditioner 12 and the power consumption of the load 300 is reduced, if the power supply from the solar power generator 22 is stopped, the control to be resumed is performed on the conditioner 12. Do it.

<Second Embodiment>
Hereinafter, a power supply system according to a second embodiment of the present invention will be described with reference to the drawings. The power supply system according to the second embodiment of the present invention has the same configuration as that of the first embodiment, and operations different from those of the first embodiment will be described below.
The power consumption prediction unit 13 acquires the actual value of the power consumption of the load 300 in the dead time zone, which is a fixed time after the control cycle is started, and the power consumption of the load 300 within the control cycle is obtained from this actual value. A predicted power consumption value is obtained as a predicted value. Here, the power consumption prediction unit 13 multiplies the power consumption in the dead time zone by a coefficient obtained by dividing the time in the control period by the time in the dead time zone, and the multiplication result is the power consumption in the control cycle. Estimated value. Further, the power consumption prediction unit 13 outputs the calculated power consumption prediction value to the difference calculation unit 15.

  Similarly to the power consumption prediction unit 13, the generated power prediction unit 14 generates power from each of the solar power generators 22_1 to 22_n in a dead time period that is a fixed time after the start of the control cycle. The actual value of the amount is acquired, and the predicted value of the power generation amount of each of the solar power generators 22_1 to 22_n within the control period is obtained from the actual value. Here, the generated power prediction unit 14 multiplies each generated power of the solar power generator in the dead time zone by a coefficient obtained by dividing the time of the control cycle by the time of the dead time zone, and the multiplication result Is the predicted value of the generated power within the control period of each solar power generator. Then, the generated power prediction unit 14 adds the predicted value of the power generation amount of the solar power generator that is currently supplying power to the in-facility system 50, and uses this addition result as the generated power predicted value. The generated power prediction unit 14 outputs the calculated generated power predicted value to the difference calculation unit 15.

  The difference calculation unit 15 subtracts the predicted power consumption value supplied from the power consumption prediction unit 13 from the predicted power generation value supplied from the generated power prediction unit 14 to obtain a difference as a verification result. In addition, the difference calculation unit 15 outputs the obtained difference to the battery remaining amount prediction unit 16 and the operation management unit 17.

  The remaining battery capacity prediction unit 16 measures the remaining battery capacity of the storage battery 21 in the dead time zone. Further, the battery remaining amount prediction unit 16 adds the difference obtained by the difference calculation unit 15 to the measured battery remaining amount of the storage battery 21, and outputs the result as a battery remaining amount predicted value.

  The operation management unit 17 exceeds the preset upper limit target value (for example, the maximum battery remaining amount in the specification of the storage battery 21 or an arbitrary first battery remaining amount) as the battery remaining amount predicted value of the current storage battery 21 is set in advance. Or below the lower limit target value (for example, the minimum remaining battery level in the specification of the storage battery 21 or any second remaining battery level below the first battery level), or the upper limit target value and the lower limit It is determined whether it is within the range of the target value. Each of the upper limit target value and the lower limit target value is set in the same manner as in the first embodiment. Here, as will be described later, when the predicted remaining battery level exceeds the upper limit target value, the operation management unit 17 may cause the remaining battery level of the storage battery 21 to exceed the upper limit target value in the next control cycle. In order not to perform the control, the control for reducing the total power generated by the solar power generators 22_1 to 22_n and the control for operating the stopped load are performed. On the other hand, when the predicted battery remaining value exceeds the lower limit target value, the operation management unit 17 stops so that the remaining battery level of the storage battery 21 does not fall below the limit target value in the next control cycle. The solar power generation that has been performed is performed, and the power consumption of the load 300 is reduced.

  When the operation management unit 17 performs control to reduce the total power generated by the solar power generator 22_1 to the solar power generator 22_n, the operation management unit 17 sets the upper limit target value from the predicted remaining battery level as in the first embodiment. Subtraction is performed, and the subtraction result is divided by the control cycle, and this division result is output as the amount of power generation reduction. On the other hand, when performing the control to reduce the power consumption of the load 300, the operation management unit 17 subtracts the battery remaining amount predicted value from the lower limit target value, as in the first embodiment, and subtracts the subtraction result according to the control cycle. Divide and output the result of division as a power consumption reduction amount.

  In addition, when the operation management unit 17 performs control to reduce the total power generated by the solar power generators 22_1 to 22_n, the total power generated by the solar power generators to be stopped is equal to or greater than the power generation reduction amount. Then, the supply of generated power from the solar power generator 22_1 to the solar power generator 22_n is stopped. The supply of generated power is stopped by a process of stopping the power conditioner corresponding to each solar power generator and stopping the supply of generated power from the solar power generator to the in-facility system 50. In addition, in the solar power generator 22_1 to the solar power generator 22_n, the order of stopping is set in advance, and the operation management unit 17 supplies power in the set order at the timing when the non-interval time period ends. The power supply from the solar power generator is stopped until the total of the generators of the solar power generator that has stopped is equal to or greater than the generated power reduction amount.

  On the other hand, when performing the control for reducing the power consumption of the load 300, the operation management unit 17 reduces the power consumption of the load 300 so as to be equal to or greater than the power consumption reduction amount. Here, when the load 300 is composed of a plurality of loads, the order of stopping is set in advance in order of lower importance, and the operation management unit 17 stops at the timing when the non-interval time period ends. The load is stopped in the set order until the total power consumption of the load is equal to or greater than the power consumption reduction amount.

  Next, in this embodiment, the case where the commercial system 500 becomes abnormal and the power supply system 1 performs a self-sustained operation will be described below. FIG. 4 is a flowchart showing an operation example in a state where the commercial system 500 becomes abnormal and the power supply system 1 according to the second embodiment is performing a self-sustaining operation. Further, the process of the flowchart of FIG. 4 shown below is performed during the m0 minute of the dead time zone from the start time (start time of the demand time period) for each control cycle in FIG. Then, after m0 minutes have elapsed from the time T at the start of the control cycle, that is, from the time T + m0 when the dead time period ends, the control set in the dead time period is performed.

Step S21:
The operation management unit 17 does not control the power supply from the solar power generator 22_1 to the solar power generator 22_n and the power consumption of the load 300 during the dead time period.

Step S22:
The power consumption prediction unit 13 measures the power consumption consumed by the load 300 during the dead time period.

Step S23:
The generated power prediction unit 14 measures the generated power generated by each of the solar power generators 22_1 to 22_n during the dead time period.

Step S24:
The remaining battery capacity prediction unit 16 measures the remaining battery capacity of the storage battery 21 when the dead time period ends (time T + m0). Further, the battery remaining capacity prediction unit 16 outputs the measured battery remaining capacity to the operation management unit 17.

Step S25:
Next, the power consumption prediction unit 13 obtains a predicted power consumption value that is a predicted value of the load power consumption of the load 300 after the dead time period in the control cycle has elapsed, that is, in the time range after time T + m0. Then, the power consumption prediction unit 13 outputs the calculated power consumption prediction value to the difference calculation unit 15.

Step S26:
Next, the generated power prediction unit 14 supplies power to the in-facility system 50 in the solar power generator 22_1 to the solar power generator 22_n after the dead time period in the control cycle has elapsed, that is, in the time range after time T + m0. The generated power predicted value, which is the predicted value of the total generated power of the solar power generators that are performing, is obtained. Here, the generated power prediction unit 14 obtains a predicted value of the generated power of each of the solar power generators 22_n from the solar power generator 22_1, and adds the predicted value of the generated power of the operating solar power generator among them. Then, the addition result is used as the predicted power generation value.
Then, the generated power prediction unit 14 outputs the calculated generated power prediction value to the difference calculation unit 15.

Step S27:
Next, the difference calculation unit 15 subtracts the power consumption prediction value supplied from the power consumption prediction unit 13 from the power generation prediction value supplied from the power generation power prediction unit 14, and operates the difference obtained by this subtraction operation management. Output to the unit 17.
Then, the operation management unit 17 adds the difference supplied from the difference calculation unit 15 to the battery remaining amount supplied from the battery remaining amount prediction unit 16, and the addition result is a storage battery at the end of the current control cycle. It is assumed that the remaining battery level is a predicted value of the remaining battery level.

Next, the operation management unit 17 compares the estimated remaining battery level with the target value (maximum remaining battery level in the specification of the storage battery 21).
At this time, if the predicted battery remaining value exceeds the target value (the maximum remaining battery level in the specification of the storage battery 21 or an arbitrary first remaining battery level), the operation management unit 17 advances the process to step S30.
On the other hand, when the predicted battery remaining value is equal to or less than the target value (the maximum remaining battery capacity or any first remaining battery capacity in the specification of the storage battery 21), the operation management unit 17 advances the process to step S30.

Step S28:
Next, the operation management unit 17 subtracts the target value (the maximum remaining battery level in the specification of the storage battery 21 or an arbitrary first remaining battery level) from the predicted remaining battery level, and divides the subtraction result by the control period. This division result is used as a power generation reduction amount.

Step S29:
The operation management unit 17 sets the solar power generators 22_1 to 22_n so that the total of the power generators of the solar power generators whose power supply has been stopped is equal to or greater than the power generation reduction amount in the set order. Among these, after the dead time period has elapsed, that is, after time T + m0, a solar power generator that stops the supply of generated power is set. And the operation management part 17 complete | finishes the process of a flowchart, and stops the electric power supply from the solar power generator set to stop within a non-interval time slot | zone after progress of a dead time slot | zone. In addition, the operation management unit 17 performs control so as to start power supply to a load in which power supply is stopped in the load 300, and ends the process.

Step S30:
Next, the operation management unit 17 compares the calculated battery remaining amount predicted value with a target value (the minimum battery remaining amount in the specification of the storage battery 21 or set arbitrarily).
At this time, the operation management unit 17, when the battery remaining power prediction value is below the target value (the minimum battery remaining in the specification of the storage battery 21 or any second battery remaining less than the first battery remaining), The process proceeds to step S31.
On the other hand, the operation management unit 17 performs processing when the estimated remaining battery level is equal to or greater than a target value (the minimum remaining battery level in the specification of the storage battery 21 or an arbitrary second remaining battery level less than the first remaining battery level). finish.

Step S31:
Next, the operation management unit 17 subtracts the predicted remaining battery level from the target value (the minimum remaining battery level in the specification of the storage battery 21 or any second remaining battery level less than the first remaining battery level), and the subtraction result Is divided by the control period, and the result of the division is used as the power consumption reduction amount.

Step S32:
The operation management unit 17 uses the power consumption of the load 300 in the current control cycle after time T + m0, so that the power consumption to be reduced (reduced) in the load 300 is equal to or greater than the power consumption reduction amount. Set. And the operation management part 17 complete | finishes the process of a flowchart, and after the dead time zone passes, the operation | movement of the load 300 is performed within the range of the power consumption calculated | required in this dead time zone. Moreover, the operation management part 17 of the power conditioner corresponding to start the electric power supply from the solar power generator which has stopped the power supply among the solar power generators 22_1 to 22_n. Take control.

  As described above, according to the present embodiment, the consumption of the load 300 in the current cycle from the actual value measured within the time set in advance as the dead time zone from the time when the current control cycle (demand time period) starts. It becomes possible to perform real-time DR processing based on the predicted value of the power generation amount of each of the electric power and the solar power generators 22_1 to 22_n. Thus, according to the present embodiment, the power consumption of the load 300 in each control cycle and the generated power of each of the solar power generators 22_1 to 22_n are not estimated values from past data but based on the actual values. Since the estimated value is obtained, the remaining battery level of the storage battery 21 can be controlled with higher accuracy than in the first embodiment.

  In addition, a program for realizing the functions of the power consumption prediction unit 13, the generated power prediction unit 14, the difference calculation unit 15, the remaining battery level prediction unit 16, and the operation management unit 17 in FIG. 1 is recorded on a computer-readable recording medium. Then, the remaining amount of the storage battery may be managed by causing the computer system to read and execute the program recorded on the recording medium. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Electric power supply system 11, 12_1, 12_n ... Power conditioner 13 ... Power consumption prediction part 14 ... Generated power prediction part 15 ... Difference calculating part 16 ... Battery residual quantity prediction part 17 ... Operation management part 21 ... Storage battery 22_1, 22_n ... Photovoltaic generator 50 ... Institutional system 150 ... Independent range circuit breaker 200 ... System linkage relay 300 ... Load 500 ... Commercial system

Claims (4)

A power supply system that supplies power to a load connected to a power system in a self-sustaining operation range when there is no power supply from a commercial system,
A storage battery connected to the power system;
A solar power generator connected to the power system;
A difference calculation unit for obtaining a difference between a generated power predicted value that is a predicted value of the generated power of the solar power generator and a predicted power consumption value that is a predicted value of the power consumption of the load;
From the difference, the control cycle, and the battery remaining amount of the storage battery, a battery remaining amount prediction unit that obtains a battery remaining amount predicted value that is a predicted value of the battery remaining amount of the storage battery in the control cycle to be controlled;
An operation management unit that compares the battery remaining power prediction value with a preset target value, and controls the generated power and the power consumption in the control period based on the comparison result. Power supply system. The operation management unit
When the battery remaining amount in the control cycle exceeds a preset upper limit value, the target value is set as the remaining capacity maximum value in the specification of the storage battery, and the battery remaining amount predicted value exceeds the target value, the control When the generated power of the photovoltaic generator in the cycle is reduced, while the remaining battery level in the control cycle falls below a preset lower limit value, the target value as the remaining capacity minimum value in the specifications of the storage battery, 2. The power supply system according to claim 1, wherein when the predicted remaining battery level is lower than the target value, the power consumption of the load in the control cycle is reduced. The battery remaining capacity prediction unit
Subtract the power consumption predicted value from the generated power predicted value, the subtraction result as the difference,
The battery remaining capacity prediction unit
Obtaining the predicted remaining battery level, which is the remaining battery level of the storage battery in the next control cycle, by adding the multiplication result of the difference and the control cycle to the current remaining battery level of the storage battery. The power supply system according to claim 1 or 2, characterized by the above. When there is no power supply from a commercial system, a power supply method for supplying power from a storage battery and a solar power generator provided in the power system to a load connected to a power system in a self-sustaining operation range,
The difference calculation unit obtains a difference between a predicted power generation value that is a predicted value of power generated by the solar power generator and a predicted power consumption value that is a predicted value of power consumption of the load;
A battery remaining amount prediction unit that obtains a battery remaining amount predicted value that is a predicted value of the battery remaining amount of the storage battery in the control cycle to be controlled from the difference, the control cycle, and the battery remaining amount of the storage battery The prediction process,
The operation management unit has an operation management process for comparing the predicted remaining battery value with a preset target value and controlling the generated power and the consumed power in the control period based on the comparison result. A power supply method characterized by the above.

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