JP6002196B2 - Load control device - Google Patents

Load control device Download PDF

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JP6002196B2
JP6002196B2 JP2014228226A JP2014228226A JP6002196B2 JP 6002196 B2 JP6002196 B2 JP 6002196B2 JP 2014228226 A JP2014228226 A JP 2014228226A JP 2014228226 A JP2014228226 A JP 2014228226A JP 6002196 B2 JP6002196 B2 JP 6002196B2
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power
hot water
load
device
power storage
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JP2015073433A (en
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高木 康夫
康夫 高木
孝裕 山田
孝裕 山田
雅彦 村井
雅彦 村井
谷本 智彦
智彦 谷本
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株式会社東芝
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Description

  Embodiments described herein relate generally to a load control device.

Conventionally, when installing a natural energy power generation device, for example, a solar power generation device in a house, a power storage device is also installed and charged and discharged at the same time. When the amount of charge of the power storage device is full during the time when the photovoltaic power generator is generating power, if the operation of the device that consumes power in the home is stopped, the amount of power used in the home decreases, Although a reverse power flow from the home to the distribution system occurs, the amount of power generated from the solar power generation device may be suppressed at this time.

This is a method of causing a reverse power flow to the distribution system on the commercial power supply side when the amount of power generated by the photovoltaic power generation device at home exceeds the amount of power used. Since the voltage must exceed the voltage on the distribution system side, it becomes difficult to perform the reverse power flow when the voltage on the distribution system side rises due to the reverse flow of many nearby households at the same time,
This is because the power conditioner of the solar power generation device suppresses the power generation amount itself.

In addition, when charging the power storage device, the amount of charge at that time is not taken into consideration, so if the power generated by the solar power generation device exceeds the power consumption of the entire household load, the power storage device charge amount May become full, and no more electricity can be stored, causing reverse power flow. In this case as well, there is a possibility that the amount of power generated by the solar power generation device is suppressed and the solar energy is not effectively used. Moreover, since the charge amount is not calculated in a planned manner, the use of an inexpensive commercial power source may not be efficient.

Therefore, in order to solve the above-described problem, a load that improves both energy saving and economic efficiency by maximizing the amount of power generated by the photovoltaic power generation apparatus and increasing the amount of inexpensive late-night power used. A control device is considered.

The load control device includes a power generation prediction unit that calculates a predicted power generation amount that is a predicted value of the power generation amount of the solar power generation device based on a past history, and a predicted value of power usage based on the past history. A load prediction unit that calculates a predicted load amount, a charge amount calculation unit that calculates an amount of power stored in the power storage device at midnight by changing the predicted load amount and the operation time of the device, and every predetermined time interval stored in the power storage device Storage unit price calculation unit that calculates a storage amount curve that is a transition of the amount of power and a storage unit price curve that is a unit price of the stored power at a predetermined time interval; a predicted power generation amount, a predicted load amount, a storage amount curve, and a storage unit price A charge calculation unit that calculates a daily power charge from the curve and the charge of the commercial power supply, a power storage control unit that controls the power storage device based on the calculated charge amount, and a device operation based on the calculated device operation schedule Do control And a vessel control unit, such that the most energy-saving and cost saving, and controls the power storage device and the device.
As a result, the surplus power of solar power generation is reduced by controlling the operation time of the device during the time when the predicted power generation amount of the photovoltaic power generation device exceeds the predicted power consumption, and the surplus that is reduced by changing the operation time of the device By calculating the amount of power that is the amount of late-night power to be charged from the power generation amount, the predicted power load and the remaining power amount in the power storage device, and controlling the power storage device charge amount, Maximize and increase the use of cheap late-night power.

As a result, it is possible to efficiently use natural energy obtained from the solar power generation device and increase the usage fee of inexpensive late-night power, so that it is possible to improve the energy saving and at the same time improve the economy. .

In the load control device described above, the amount of power storage device charge and the operation schedule of the device are determined in advance using the predicted photovoltaic power generation amount based on the past history and the predicted load amount based on the past history. Therefore, the power storage device is controlled.

However, in the actual power system, whether or not the distribution voltage rises so as to inhibit reverse power flow, whether or not the operation of home appliances is actually assumed in advance, whether the weather is as predicted, etc. There are many events that cannot be handled by the predetermined scheduling control. Therefore, a scheduled power storage plan is not always the one that uses solar power most effectively.

JP 2007-295680 A

An object of the embodiment of the present invention is to obtain a load control device that can avoid the output suppression of the natural energy power generation device and can improve the utilization efficiency of the amount of power generated by the natural energy power generation device.

The load control device according to the embodiment of the present invention controls a power storage unit that charges power and a load unit whose power consumption response is slower than that of the power storage unit. Further, when a value related to the output from the natural energy power generation means connected to the power storage means and the load means exceeds a first threshold, the load power of the power storage means and the load means is increased and then set in advance. Control means for reducing the load power of the power storage means after a lapse of time.

The figure which shows the structure of the household energy management system in 1st Embodiment. (A) The figure which shows the electric power generation amount of the solar power generation device 1 in 1st Embodiment. (B) The figure which shows the voltage value measured by the voltage measurement apparatus 5 in 1st Embodiment. (C) The figure which shows the total load electric energy of the electrical storage apparatus 2 and the hot water storage type water heater 3 in 1st Embodiment. (A) The figure which shows the electric power generation amount of the solar power generation device 1 in the case of not controlling the electrical storage apparatus 2 in 1st Embodiment. (B) The figure which shows the voltage value measured by the voltage measurement apparatus 5 when not controlling the electrical storage apparatus 2 in 1st Embodiment. (C) In 1st Embodiment, the figure which shows the total load electric energy of the electrical storage apparatus 2 and the hot water storage type water heater 3 when not controlling the electrical storage apparatus 2. FIG. The figure which shows the structure of the household energy management system in 2nd Embodiment. (A) The figure which shows the electric power generation amount of the solar power generation device 1 in 2nd Embodiment. (B) The figure which shows the voltage value measured by the voltage measurement apparatus 5 in 2nd Embodiment. (C) The figure which shows the total load electric energy of the electrical storage apparatus 2 and the hot water storage type water heater 3 in 2nd Embodiment. The figure which shows the structure of the household energy management system in 3rd Embodiment.

Hereinafter, a household energy management system according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
(Constitution)
The configuration of the home energy management system according to the first embodiment will be described with reference to FIG. The home energy management system of this embodiment includes a solar power generation device 1, a power storage device 2, a hot water storage type hot water heater 3, a voltage measurement device 5, and a load control device 6.

The solar power generation device 1 is one of natural energy power generation devices and includes a commercial system 7 (commercial power source,
Power transmission lines, distribution lines and the like) are connected at the connection point 4, and the generated power is transmitted to the commercial system 7. Further, although not shown, a power conditioner (hereinafter referred to as PCS) for converting the DC power generated by the solar power generation device 1 into AC single-phase power is provided, and a protection circuit for the commercial system 7 is provided in the PCS. And has a function of stopping output when the output voltage deviates from 107 V, which is the upper limit of a predetermined voltage range 101 V ± 6 V.

The power storage device 2 is, for example, a storage battery, flywheel, capacitor, SMES, or the like, and can store electrical energy and output the stored electrical energy at an arbitrary timing. The power storage device 2 is connected to the commercial system 7 and is supplied with electric power from the commercial system 7 during charging, and discharges electric power to the commercial system 7 during discharging. In addition, the power storage device 2 is connected to the load control device 6 and is charged when a power storage device charge control signal is received from the load control device 6, and is stopped when a power storage device stop control signal is received.

Further, although not shown, a PCS for controlling charging / discharging of the power storage device 2 is provided.
Has a function of controlling charging / discharging while considering the heat generation of the power generation device. Since control by the PCS is inverter control, charging is started almost without delay when a power storage device charging control signal is received, and charging is stopped almost without delay when a power storage device stop control signal is received.

The hot water storage type water heater 3 is a heat pump type hot water heater, which uses a heat pump to warm and store hot water at a low temperature so that the resident can use the hot water stored at any timing. To do. This hot water storage type water heater 3 is connected to a commercial system 7 and warms water with electric power supplied from the commercial system 7 during hot water storage (when warming water). The hot water storage type water heater 3 is connected to the load control device 6, starts hot water storage when receiving a hot water storage start control signal from the load control device 6, and stops hot water storage when receiving a hot water storage stop control signal.

However, even when this hot water storage type water heater 3 receives a hot water storage start control signal from the load control device 6 and starts hot water storage, a protection operation of about 5 minutes from the start of hot water storage is performed to protect the heat pump. Therefore, full load operation (full power operation) is performed after the protection operation time has elapsed.

The voltage measuring device 5 measures the system voltage V 0 between the solar power generation device 1 and the connection point 4 and outputs the measurement result to the load control device 6.

The load control device 6 includes a voltage comparison unit 8, a water heater start time calculation unit 9, and a device control unit 10.

The voltage comparison means 8 compares the system voltage V0 measured by the voltage measuring device 5 with the first reference voltage V1 and the second reference voltage V2 set in advance. When the system voltage V0 exceeds the first reference voltage value V1 set in advance, the storage device charging signal for starting the charging of the storage device 2 to the hot water heater start time calculating means 9, and the hot water storage type hot water supply The hot water storage start signal for starting the hot water storage of the device 3 is output. When the system voltage V0 falls below the second reference voltage V2 set in advance, a hot water storage stop signal for stopping the hot water storage type water heater 3 is output to the water heater start time calculating means 9. Here, the first reference voltage V1 is set higher than the second reference voltage V2.

When the hot water heater activation time calculation means 9 receives the power storage device charging signal and the hot water storage start signal from the voltage comparison means 8, it passes the power storage device charging signal and the hot water storage start signal to the device control means 10 and sets in advance. It waits for the protection operation time of the stored hot water heater 3. Then, when the hot water heater activation time calculation means 9 confirms that the protection operation time has elapsed from the time when the power storage device charging signal and the hot water storage start signal are delivered, and the hot water storage water heater 3 is in full load operation, the equipment control means 10, a power storage device stop signal for stopping the charging of the power storage device 2 is output.

When the hot water heater activation time calculation means 9 receives the hot water storage stop signal from the voltage comparison means 8, it passes the received hot water storage stop signal to the device control means 10.

The device control means 10 outputs a power storage device charging control signal to the power storage device 2 when receiving the power storage device charging signal from the water heater start time calculating means 9 and stores the power storage device when receiving the power storage device stop signal. A power storage device stop control signal is output to the device 2. Similarly, the device control means 10
When a hot water storage start signal is received from the hot water heater activation time calculation means 9, a hot water storage start control signal is output to the hot water storage hot water heater 3, and when a hot water storage stop signal is received, In response, a hot water storage stop control signal is output.

(Function)
Next, operation | movement of the household energy management system of this embodiment is demonstrated using FIG. FIG. 2 shows (a) the amount of power generated by the photovoltaic power generator 1 and (b) the voltage measuring device 5 when the power storage device 2 and the hot water storage hot water heater 3 are controlled using the household energy management system of the present embodiment. The measured voltage value, (c) the total load power of the power storage device 2 and the hot water storage type water heater 3 are shown.

As shown in FIG. 2A, the daily power generation amount generated by the solar power generation device 1 is maximum during the day and minimum during the night. Therefore, as shown in FIG. 2B, the voltage value measured by the voltage measuring device 5 increases during the day and exceeds the first reference voltage V1, or decreases at night and decreases to the second reference voltage V2. May fall below.

The voltage comparison means 8 detects that the first reference voltage V1 has been exceeded, and the hot water heater activation time calculation means 9 causes the power storage device charging signal to start charging the power storage device 2 and the hot water storage type water heater. 3
A hot water storage start signal for starting hot water storage is output. Upon receiving the power storage device charging signal and the hot water storage start signal, the water heater start time calculating means 9 delivers the power storage device charging signal and the hot water storage start signal to the device control means 10.

Receiving the power storage device charging signal and the hot water storage start signal, the device control means 10 outputs a power storage device charging control signal to the power storage device 2 to start charging, and outputs a hot water storage start control signal to the hot water storage type hot water heater 3. To start.

Furthermore, when the hot water heater activation time calculation means 9 confirms that the preset protection operation time has elapsed from the time when the power storage device charging signal and the hot water storage start signal are delivered, the hot water storage water heater 3 has been fully loaded, A power storage device stop signal for stopping the charging of the power storage device 2 is output to the device control means 10. The device control means 10 that has received the power storage device stop signal receives the power storage device 2
To output a power storage device stop control signal to stop charging.

Thereafter, the voltage comparison means 8 detects that the voltage value measured by the voltage measuring device 5 has fallen below the second reference voltage V2 as the amount of power generated by the photovoltaic power generator 1 decreases, and calculates the hot water heater start time. A hot water storage stop signal is output to the means 9. Upon receiving the hot water storage stop signal, the hot water heater activation time calculation means 9 delivers the hot water storage stop signal to the device control means 10. The device control means 10 that has received the hot water storage stop signal outputs a hot water storage stop signal to the hot water storage type hot water heater 3 and stops the hot water storage type hot water heater 3 to stop the hot water storage.

(effect)
In this embodiment, it is possible to avoid the output suppression of the solar power generation device 1 and improve the utilization efficiency of the power generation amount by the solar power generation device 1.

The improvement of the power generation utilization efficiency will be described below. When the voltage value measured by the voltage measuring device 5 exceeds the first reference voltage V1 without using the power storage device 2, the hot water storage water heater 3 starts hot water storage and falls below the second reference voltage V2. The case where hot water storage is stopped will be described with reference to FIG. FIG. 3A shows the amount of power generated by the solar power generation device 1, and FIG. 3B shows the voltage measurement device 5.
FIG. 3C shows the load power measured by the hot water storage water heater 3.

When the voltage value measured by the voltage measuring device 5 exceeds the first reference voltage V1, hot water storage of the hot water storage type water heater 3 is started, but a protection operation period of about 5 minutes is set after the start of hot water storage. The voltage value does not decrease immediately. Therefore, when the voltage value exceeds 107 V, which is the upper limit of the PCS voltage range, during the protection operation period, power generation by the solar power generation device 1 is stopped.

That is, in this embodiment, in addition to the hot water storage type water heater 3, the power storage device 2 having a quick response to the charging operation.
Since the start / stop is controlled, there is no need to stop the solar power generation device 1 and suppress the output, so that it is possible to improve the utilization efficiency of the power generation amount.

In addition, when the hot water storage water heater 3 starts full load operation, charging of the power storage device 2 is stopped.
The power storage amount of the power storage device 2 is rarely full, and the load on the power storage device 2 can be suppressed.


The voltage comparison unit 8 of the present embodiment outputs the power storage device stop signal and the hot water storage stop signal to the water heater start time calculation unit 9, but directly outputs them to the power storage device 2 and the hot water storage type water heater 3. May be. At this time, the power storage device 2 that has received the power storage device stop signal stops charging, and the hot water storage type water heater 3 that has received the hot water storage stop signal stops hot water storage.

In addition, the device control unit 10 of the present embodiment receives the power storage device charging signal and the power storage device stop signal from the water heater start time calculating unit 9, and stores the power storage device charging control signal and the power storage device stop control signal for the power storage device 2. Is output. The device control means 10 also includes a hot water heater start time calculation means 9.
The hot water storage start signal and the hot water storage stop signal are received from the hot water storage hot water heater 3 and the hot water storage start signal and the hot water storage stop signal are output. However, the storage device charging signal and the storage device stop signal may be directly output to the storage device 2, and the hot water storage start signal and the hot water storage stop signal may be output to the hot water storage type water heater 3 directly from the hot water heater activation time calculation unit 9.

At this time, the power storage device 2 starts charging when the power storage device charging signal is received, and stops charging when the power storage device stop signal is received. Similarly, the hot water storage type water heater 3 starts hot water storage when it receives a hot water start signal, and stops hot water storage when it receives a hot water stop signal.

In addition, the hot water heater activation time calculation unit 9 of the present embodiment waits for a preset protection operation time from the time when the power storage device charging signal and the hot water storage start signal are output to the device control unit 10, and the power storage device stop signal Is output to the device control means 10. However, it is not necessary to output a power storage device stop signal for stopping the power storage device 2 immediately after the end of the protection operation time, and if the storage amount of the power storage device 2 is not full after the end of the protection operation time, the same An effect can be obtained.

Moreover, since the protection operation time of the hot water storage type hot water heater 3 varies depending on the change parameters such as the outside air temperature and the atmospheric pressure at the time of start-up, the water heater start time calculation means 9 does not show these current change parameters at a temperature not shown. More accurate control is possible by adjusting the protection operation time set in advance based on the change parameter received from the gauge and barometer.


(Second Embodiment)
Next, a second embodiment according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted. The difference in configuration from the first embodiment is that it has a rechargeable time calculation means 11 instead of the hot water heater activation time calculation means 9.

Further, the voltage comparison means 8 compares the system voltage V0 measured by the voltage measuring device 5 with the first reference voltage V1 and the second reference voltage V2. When the system voltage V0 exceeds a preset first reference voltage value V1, a chargeable device charge signal for starting charging of the power storage device 2 is output to the chargeable time calculation means 11. When the system voltage V0 falls below the second reference voltage V2 set in advance, a hot water storage stop signal for stopping the hot water storage type water heater 3 is output to the chargeable time calculation means 11.

When the chargeable time calculation means 11 receives the power storage device charge signal from the voltage comparison means 8, it passes this power storage device charge signal to the device control means 10 and calculates the hot water storage standby time by the equation (1). This hot water storage standby time is the standby time from when the chargeable time calculating means 11 delivers the power storage device charging signal to the device control means 10 until the hot water storage type water heater 3 outputs a hot water start signal for starting hot water storage. It is. By outputting the hot water storage start signal after the hot water storage standby time has elapsed from the time when the power storage device charging signal is delivered, the hot water storage type hot water heater 3 can be fully loaded at the timing when the amount of power stored in the power storage device 2 is full.

Hot water storage standby time = (power storage capacity−current power storage amount) / (charged power value) − (protection operation time)...
Here, the storage capacity is the upper limit value of the storage amount of the storage device 2, the current storage amount is the current storage amount of the storage device 2, and the charge power value is the charge amount per unit time.

When the chargeable time calculation means 11 confirms that the hot water storage standby time has elapsed from the time when the power storage device charging signal is delivered to the equipment control means 10, the hot water storage hot water heater 3 is stored in the equipment control means 10. A hot water storage start signal for starting is output.

When the hot water storage stop signal is received from the voltage comparison unit 8, the chargeable time calculation unit 11 passes the received power storage device stop signal and hot water storage stop signal to the device control unit 10.

(Function)
Next, operation | movement of the household energy management system of this embodiment is demonstrated using FIG. FIG. 5 shows (a) the amount of power generated by the photovoltaic power generator 1 and (b) the voltage measuring device 5 when the power storage device 2 and the hot water storage hot water heater 3 are controlled using the household energy management system of the present embodiment. The measured voltage value, (c) the total load power of the power storage device 2 and the hot water storage type water heater 3 are shown.

As in the first embodiment, the daily power generation amount generated by the solar power generation device 1 in FIG. 5A is maximum during the day and minimum during the night. Therefore, as shown in FIG. 5B, the voltage value measured by the voltage measuring device 5 increases during the day and exceeds the first reference voltage V1, or decreases at night and decreases to the second reference voltage V2. May fall below.

The voltage comparison means 8 detects that the first reference voltage V1 has been exceeded, and the chargeable time calculation means 1
1, a power storage device charging signal for starting charging of the power storage device 2 is output. The chargeable time calculation unit 11 that has received the power storage device charging signal delivers the power storage device charging signal to the device control unit 10.

The device control means 10 that has received the power storage device charging signal outputs a power storage device charging control signal to the power storage device 2 and starts the power storage device 2 to start charging.

Further, when the chargeable time calculation means 11 confirms that the hot water storage standby time has elapsed from the time when the power storage device charging signal is delivered to the device control means 10, the charge control device 10 charges the hot water storage type water heater 3 to the device control means 10. A hot water storage start signal for starting is output. The device control means 10 that has received the hot water storage start signal outputs a hot water storage start control signal to the hot water storage type water heater 3 and starts the hot water storage type water heater 3 to start hot water storage. Thereafter, when the amount of power stored in power storage device 2 becomes full, power storage device 2 stops.

Further, the voltage comparison means 8 detects that the voltage value measured by the voltage measurement device 5 has fallen below the second reference voltage V2 as the amount of power generated by the solar power generation device 1 decreases, and the chargeable time calculation means. 11 outputs a hot water storage stop signal. Upon receiving the hot water storage stop signal, the hot water heater activation time calculation means 9 delivers the hot water storage stop signal to the device control means 10. The device control means 10 that has received the hot water storage stop signal outputs a hot water storage stop control signal to the hot water storage type hot water heater 3 and stops the hot water storage of the hot water storage type water heater 3.

(effect)
In the present embodiment, in addition to the hot water storage type water heater 3, the start-up and
Since the stop is controlled, it is not necessary to stop the solar power generation device 1 and suppress the output.
It is possible to improve the utilization efficiency of the power generation amount.


Note that the chargeable time calculation unit 11 of the present embodiment is configured so that the protection operation time of the hot water storage type water heater 3 ends and the full load operation starts at the timing when the amount of power stored in the power storage device 2 becomes full. The hot water storage start signal is output after the hot water storage waiting time has elapsed from the time when the power storage start signal is output to the control means 10. However, in order to prevent the power storage amount of power storage device 2 from becoming full, the hot water storage standby time is calculated using equation (2), and the power storage device is stopped to stop power storage device 2 at the timing when the protection operation time ends. The chargeable time calculation unit 11 may output the signal to the device control unit 10. The expression (2) is calculated at a timing of reaching 80% of the upper limit storage amount of the storage device 2.
A hot water storage standby time when the hot water storage type water heater 3 starts full load operation and the power storage device 2 stops is shown.

Hot water storage standby time = (power storage capacity × 0.8−current power storage amount) / (charged electric power value) − (protective operation time) (2) equation where “(power storage capacity × 0.8−current power storage amount ) / (Charged power value) ”is referred to as a set charge amount time indicating the time until the current charge amount of the power storage device 2 reaches a preset charge amount (here, 80% of the upper limit charge amount). It is out.


In addition, in 1st Embodiment and 2nd Embodiment, although the electrical storage apparatus 2 and the hot water storage type water heater 3 are single, even if it is multiple, the same effect can be acquired by performing the same control. Is possible. Moreover, even if the power storage device 2 is different in, for example, the type of storage battery and flywheel, the same effect can be obtained by the same control.

Moreover, when the electric power generation amount of the solar power generation device 1 fluctuates violently in a short period (several seconds), the voltage value measured by the voltage measurement device 5 may change similarly. In that case, the voltage comparison means 8 includes an average value or an RMS value (Root Mean Square) of the arbitrary time zone among the voltage values measured by the voltage measuring device 5, and the first reference voltage V1. The same effect can be obtained by comparing with the second reference voltage V2.


(Third embodiment)
(Configuration and action)
The configuration of the home energy management system according to the third embodiment will be described with reference to FIG. The home energy management system of this embodiment includes a solar power generation device 1, a power storage device 2, a hot water storage type hot water heater 3, a voltage measurement device 5, and a load control device 6.

The solar power generation device 1 is one of natural energy power generation devices and includes a commercial system 7 (commercial power source,
Power transmission lines, distribution lines and the like) are connected at the connection point 4, and the generated power is transmitted to the commercial system 7. Further, although not shown, a power conditioner (hereinafter referred to as PCS) for converting the DC power generated by the photovoltaic power generator 1 into AC single-phase 200V power is provided, and this PCS has a protection circuit for the commercial system 7. It has a function of stopping output when the output voltage deviates from a predetermined voltage range 101V ± 6V.

The power storage device 2 is, for example, a storage battery, flywheel, capacitor, SMES, or the like, and can store electrical energy and output the stored electrical energy at an arbitrary timing. The power storage device 2 is connected to the commercial system 7 and is supplied with electric power from the commercial system 7 during charging, and discharges electric power to the commercial system 7 during discharging. Further, although not shown, a PCS for controlling charging / discharging of the power storage device 2 is provided, and this PCS has a function of controlling charging / discharging while taking into consideration the heat generation of the power generation device. Since control by this PCS is inverter control, it responds to control almost without leaving.

The hot water storage type hot water heater 3 is a heat pump type hot water heater, which uses a heat pump to warm and store hot water at a low temperature so that a resident can use the hot water stored at any timing. To do. This hot water storage type water heater 3 is connected to a commercial system 7 and warms water with electric power supplied from the commercial system 7 during hot water storage (when warming water). However, even when the hot water storage type water heater 3 starts hot water storage, a protection operation is performed for about 5 minutes from the start of hot water storage to protect the heat pump. Therefore, full load operation (full power operation) is performed after the protection operation time has elapsed.

The voltage measuring device 5 measures the system voltage V 0 between the solar power generation device 1 and the connection point 4 and outputs the measurement result to the load control device 6.

The load control device 6 includes a voltage DB 13, a power generation DB 14, a voltage prediction unit 15, and a power generation prediction unit 1.
6. Power generation suppression amount calculation means 17, storage / hot water storage requirement calculation means 18, storage / hot water schedule control means 19, load prediction means 20, and load DB 21.

The voltage DB 13 stores the voltage value measured by the voltage measuring device 5, and the power generation DB 14
The power generation amount of the solar power generation device 1 is stored. The load DB 21 stores the power consumption of a load (not shown).

The voltage predicting unit 15 calculates a predicted voltage value indicating the voltage value of the next day from the voltage value stored in the voltage DB 13 and the weather forecast received from the weather forecast DB 12 and outputs the predicted voltage value to the power generation suppression amount calculating unit 17.

The power generation prediction unit 16 calculates a predicted power generation amount indicating the power generation amount of the next day from the power generation amount stored in the power generation DB 14 and the weather forecast received from the weather forecast DB 12, and outputs it to the power generation suppression amount calculation unit 17.

The load prediction unit 20 calculates a predicted power consumption indicating the power consumption of the next day from the power consumption stored in the load DB 21 and the weather forecast received from the weather forecast DB 12, and outputs it to the power generation suppression amount calculation unit 17. .

Here, the voltage prediction means 15, the power generation prediction means 16, and the load prediction means 20 are respectively
The predicted voltage value, predicted power generation amount, and predicted power consumption amount of the next day are predicted, but the user can arbitrarily set the prediction period indicating the period to be predicted.

The power generation suppression amount calculation means 17 suppresses power generation of the solar power generation device 1 because the voltage value measured by the voltage measurement device 5 on the next day is too high from the predicted voltage value, the predicted power generation amount, and the predicted power consumption amount. And a suppression power generation amount indicating a power generation amount generated by the solar power generation device 1 during that time period is calculated, and the suppression time and the suppression power generation amount are stored in the storage / hot water storage requirement calculation means 18. Output.

The power storage / hot water storage required amount calculation means 18 is configured to calculate the current power storage amount in the power storage device 2 and the hot water storage type water heater 3.
The current storage amount of hot water is acquired, and the start / stop of the power storage device 2 is scheduled from the acquired current storage amount and current storage amount, and the suppression time and suppression generation amount received from the power generation suppression amount calculation means 17 A power storage schedule and a hot water storage schedule in which the hot water storage water heater 3 is started and stopped are created. At this time, in the power storage schedule and the hot water storage schedule, the power generation device 2 or the hot water storage water heater 3 consumes the suppressed power generation amount predicted before the predicted suppression time so that the power generation by the solar power generation device 1 on the next day is not suppressed. Be able to,
Scheduled.

The power storage / hot water storage schedule control means 19 controls the start / stop of the power storage device 2 and the hot water storage type water heater 3 based on the power storage schedule and the hot water storage schedule created by the power storage / hot water storage requirement calculation means 18.

(effect)
In this embodiment, it is possible to avoid the output suppression of the solar power generation device 1 and improve the utilization efficiency of the power generation amount by the solar power generation device 1.


According to the embodiment of the present invention, it is possible to avoid the output suppression of the natural energy power generation device and improve the utilization efficiency of the power generation amount by the natural energy power generation device.

As mentioned above, although some embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their variations are
It is included in the scope and gist of the invention, and is included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 1 ... Solar power generation device 2 ... Power storage device 3 ... Hot water storage type water heater 4 ... Connection point 5 ... Voltage measuring device 6 ... Load control device 7 ... Commercial system 8 ... Voltage comparison means 9 ... Water heater start time calculation means 10 ... Equipment Control unit 11 ... Storage time calculation unit 12 ... Weather forecast DB
13 ... Voltage DB
14 ... Power generation DB
DESCRIPTION OF SYMBOLS 15 ... Voltage prediction means 16 ... Electric power generation prediction means 17 ... Electric power generation suppression amount calculation means 18 ... Electric power storage / hot water required amount calculation means 19 ... Electric power storage / hot water schedule control means 20 ... Load prediction means 21 ... Load DB

Claims (5)

  1. In the load control device for controlling the power storage means for charging power and the load means having a slower power consumption response than the power storage means,
    When a value related to the output from the natural energy power generation means connected to the power storage means and the load means exceeds a first threshold, a time set in advance after increasing the load power of the power storage means and the load means Comprising control means for reducing the load power of the power storage means after elapse,
    Load control device.
  2. 2. The load control device according to claim 1, wherein the control unit decreases the load power of the load unit when a value related to the output of the natural energy power generation unit is lower than a second threshold value that is lower than the first threshold value. .
  3. In the load control device for controlling the power storage means for charging and discharging power and the load means having a slower power consumption response than the power storage means,
    When the value related to the output from the natural energy power generation means exceeds the first threshold, after the amount of charge of the power storage means is increased, the time when the power storage amount of the power storage means exceeds the second threshold is set in advance. Control means for increasing the load power of the load means after elapse of time calculated based on time,
    Load control device.
  4. 4. The load control device according to claim 3, wherein the control unit decreases the load power of the load unit when a value related to the output of the natural energy power generation unit is lower than a third threshold value lower than the first threshold value. .
  5. In the load control device for controlling the power storage means for charging and discharging power and the load means having a slower power consumption response than the power storage means,
    When a value related to the output from the natural energy power generation means connected to the power storage means and the load means exceeds a first threshold, a time set in advance after increasing the load power of the power storage means and the load means Comprising control means for reducing the load power of the power storage means after elapse,
    Load control device.
JP2014228226A 2010-10-29 2014-11-10 Load control device Active JP6002196B2 (en)

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JP5138110B1 (en) * 2012-05-24 2013-02-06 キャリアシステム株式会社 Solar power system
JP6036016B2 (en) * 2012-08-30 2016-11-30 株式会社ノーリツ Heat pump hot water supply system
JP5904933B2 (en) * 2012-12-26 2016-04-20 リンナイ株式会社 Hot water storage water heater
JP5907921B2 (en) * 2013-03-27 2016-04-26 リンナイ株式会社 Heating system
JP6203016B2 (en) * 2013-11-28 2017-09-27 三菱電機株式会社 Solar power system
JP6447093B2 (en) * 2014-12-19 2019-01-09 株式会社デンソー Power management system
JP6491494B2 (en) * 2015-02-18 2019-03-27 積水化学工業株式会社 Hot water controller
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JP6495089B2 (en) * 2015-04-28 2019-04-03 京セラ株式会社 Power management apparatus and power conversion apparatus
WO2016189710A1 (en) * 2015-05-27 2016-12-01 株式会社システム・ジェイディー Voltage measurement device and voltage measurement method
JP6554923B2 (en) * 2015-06-09 2019-08-07 東京電力ホールディングス株式会社 Power control method and power control system
WO2017026287A1 (en) * 2015-08-07 2017-02-16 シャープ株式会社 Control device, energy management device, system, and control method
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