JP3810887B2 - Auxiliary power supply combined power supply system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an auxiliary power supply combined power supply system that uses, as an auxiliary power supply, a power storage device or the like that stores power by charging from a commercial power supply or the like, and supplies power from a commercial power supply or other main power supply in combination with the auxiliary power supply.
[0002]
[Prior art and problems to be solved by the invention]
One of the biggest concerns of current power supply companies is that power consumption peaked in the summer afternoon (1-4 o'clock) and is approaching the limit of power supply capacity. In order to ensure that power can always be supplied within the range of power supply capacity even during such peak hours of power consumption, an effective measure is, for example, operation during the peak season for major customers. In addition, measures such as subsidizing the vending machine with a mechanism for sufficiently cooling the vending machine in the morning and shutting down the refrigerator during peak hours are being taken.
[0003]
In such a situation, from the standpoint of a general power consumer, when operating a device that requires a peak current only for a short time, the contract requires a large current contract corresponding to the peak current, Such contracts are becoming difficult. In addition, even if the contract can be made, the basic charge will increase due to the large current contract, so if the contract is made with a very low current capacity, the voltage will drop and it will not operate normally, or satisfactory performance will be obtained. It will not be possible.
[0004]
As a long-life and high-efficiency power storage device, a power storage device ECS in which an electric double layer capacitor and an electronic circuit are combined is proposed (for example, Electronic Technology 1994 December p1-3, IEEJ Transactions B Vol. 115, No. 5, 1995) Years p504-510). This power storage device ECS provides power stored in an electric double layer capacitor by controlling a supply current by providing a current pump using a step-down / step-up switching regulator in an output circuit for extracting electric power stored in the electric double layer capacitor. A voltage that is 1/4 of the voltage at full charge can be taken out and 90% or more of the voltage can be used (see, for example, JP-A-8-168182).
[0005]
However, when this power storage device ECS is applied as a practical device, it has been a common usage so far to operate the electrical equipment and device by discharging the stored power as needed. In the case of a 1 kW household air conditioner, for example, the power required by the load device or device is usually designed so that the 1 kW power can be supplied from the 100% power storage device ECS. It was a technique. In this case, when the nighttime power is stored and used in the daytime, it is necessary to prepare the power storage device ECS having an output capacity sufficient to cover the device serving as the load, which causes a problem that the device becomes large.
[0006]
[Means for Solving the Problems]
The present invention solves the above-described problems, and aims to reduce peak power consumption, leveling power, and reducing the size of auxiliary power supply devices such as the power storage device ECS.
[0007]
To this end, the present invention provides an auxiliary power supply combined power supply system in which an auxiliary power supply is connected in parallel to a commercial power supply and supplies power to a load using the commercial power supply as a main power supply, wherein the auxiliary power supply is an electric double layer A capacitor bank; a charging device that charges the electric double layer capacitor bank; and a current pump that supplies a predetermined current from the electric double layer capacitor bank to the load according to a current setting. A load current detection device for detecting current; and a control device for controlling the charging device and the current pump, wherein the control device determines whether it is night time or daytime and daytime peak hours from the time by the clock. And controlling the charging device to charge the electric double layer capacitor bank at night, and during the daytime except for the peak time zone. The charging device is controlled to charge the electric double layer capacitor bank when the detected load current is small in the interband, and the load is controlled according to the detected load current in the peak time zone. The current pump is controlled by setting the current to be supplied so as to supply a predetermined current.
[0008]
Further, the control device sets the supplied current to a constant current, or sets the supplied current to a constant ratio of the detected current of the load. It is.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of an auxiliary power supply combined power supply system according to the present invention, wherein 1 is a commercial power source, 2 is a power storage device ECS, 3 is an inverter air conditioner, 4 is a charging device, and 5 is an electric double layer. A capacitor bank, 6 is a current pump, 7 is a rectifier, 8 is an inverter, and 9 is a compressor and a heat exchanger.
[0010]
In FIG. 1, a power storage device ECS2 supplies a load from the charging device 4 connected to the commercial power source 1, the electric double layer capacitor bank 5 charged by the output of the charging device 4, and the electric double layer capacitor bank 5. This is an auxiliary power supply device including a current pump 6 for controlling current. The charging device 4 charges the electric double layer capacitor bank 5 with nighttime electric power from the commercial power source 1, and the current pump 6 supplies the electric power stored in the electric double layer capacitor bank 5 to the load with a predetermined set current. To do. The load inverter air conditioner 3 is a commercially available inverter air conditioner comprising a rectifying unit 7 connected to the commercial power source 1, an inverter unit 8 for converting the rectified output, and a compressor and a heat exchanger 9 operated by the output of the inverter unit 8. In addition, the output of the current pump 6 of the power storage device ECS2 is connected to the input side of the inverter unit 8 in parallel with the output of the rectification unit 7, and power is supplied in parallel from the commercial power source 1 and the power storage device ECS2.
[0011]
In the auxiliary power supply combined power supply system having the above configuration, electric power is stored in the electric double layer capacitor bank 5 through the charging device 4 of the power storage device ECS2 using the nighttime power from the commercial power source 1, and the inverter air conditioner 3 of the load is In the daytime during operation, a part of the power is supplied from the power storage device ECS2. In the power storage device ECS2, since the output of the current pump 6 serves as a current source, the current can be simply added to the rectified output of the rectifying unit 7 of the inverter air conditioner 3. Therefore, when power is supplied from the power storage device ECS2 during the peak time period, the peak cut of the commercial power supply 1 can be realized, and the total power required by the inverter air conditioner 3 is supplied from the power storage device ECS2. As compared with the above, the power capacity of the current pump 6 and the output density of the electric double layer capacitor bank 5 can be significantly reduced. For example, if the output of the current pump 6 of the power storage device ECS2 is designed at 1A and 300V, the output capacity of the power storage device ECS2 is 1A × 300V = 300W. Therefore, if the power consumption of the inverter air conditioner 3 is 1kW, The design based on the premise of an output capacity of about 1/3 can realize storage of nighttime power and use in the daytime.
[0012]
In other words, considering the case where the power storage device ECS is used to store surplus night power, and that power is supplied and used at the daytime load peak, from the commercial power source at the daytime load peak The power consumption does not necessarily have to be zero. In addition, for example, when there is a storage amount of 1 kWh, reducing the power consumption for 2 hours from 1 pm to 3 pm by 500 watts reduces the power consumption for 1 hour from 1 pm to 2 pm by 1 kW. The same effect can be expected as a reduction. In this case, the power storage device ECS requires an output capacity of 1 kW for the latter, while the former requires only half of 500 W. As a result, the power storage device ECS is directly related to the capacity of the switching converter on the output side, which is called a current pump (or output converter) due to its structure, and at the same time, the current flowing through the capacitor is half that of the latter in the former. Capacitors with high resistance (low output density) and low capacitance (high energy density) can be used, which allows for significant improvements in device volume, weight, and cost.
[0013]
FIG. 2 is a diagram showing another embodiment of the auxiliary power supply combined power supply system according to the present invention, in which 11 is a load current detection device, 12 is a timepiece, and 13 is a charge control unit. The control unit 13 controls the charging device 4 and the current pump 6 of the power storage device ECS2 according to the load current consumption (power consumption) detected by the load current detection device 11 and the time zone determined by the clock 12. The charging device 4 is turned on / off, the charging current is set, and the current supplied from the current pump is set. Therefore, the current consumption of the load detected by the load current detection device 11 determines whether the load is light or heavy, and the time by the clock 12 is nighttime or daytime, or even during the daytime, the peak time zone in the afternoon or the peak Determine whether the time zone is other than the time zone. The control unit 13 can select, for example, a night charge mode, a sequential charge mode, a constant load mode, or a constant rate mode, and perform charge control and current control according to the selection mode. Of course, the operation may be fixed to any one of these modes.
[0014]
Here, the night charge mode is a mode in which the electric double layer capacitor bank 5 is charged using night power. On the other hand, in the sequential charging mode, the electric double layer capacitor bank 5 is charged using nighttime power, and the current consumption of the load is small even in the daytime depending on whether it is a peak time zone or other time zone. In this mode, charging is sometimes performed, and the charging current is set low, and charging is performed over time compared to nighttime. The constant load mode is a mode in which the value of the current supplied from the current pump 6 is always constant, and the constant ratio mode is in accordance with the current consumption of the load so that the load ratio by the power storage device ECS2 is constant. In this mode, the value of the current supplied from the current pump 6 is set. Furthermore, since the burden of these modes is intended to cut power peaks, it may be performed only during or after the peak time zone in the afternoon (1-4 o'clock).
[0015]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the power storage device ECS is charged by using the nighttime power of the commercial power supply. However, the power generation using an internal combustion engine such as solar power generation, wind power generation, tidal power generation, or an engine is used. Charging may be performed using output or other electric power, or these may be used as a main power source. Furthermore, although the main power source and the charging power source of the power storage device ECS are made the same, they may be combined as separate power sources. For example, the output from power generation using an internal combustion engine such as an engine is used as the main power supply, and separately from this, the output from commercial power supply, solar power generation, wind power generation, tidal power generation, power generation using an internal combustion engine such as an engine, and other power You may make it combine the electric power storage apparatus ECS charged using. The current supplied from the current pump of the power storage device ECS may be set not only to a constant value with respect to the power consumption of the load but also to a constant ratio. Moreover, although it demonstrated in the example applied to the inverter air conditioner marketed as a load as a load, it cannot be overemphasized that it can apply to all the apparatuses which can become a load of other various electric equipments, in other words, the electric power storage apparatus ECS. . A necessary condition in this case is that the main power supply can be used simultaneously.
[0016]
【The invention's effect】
As is clear from the above description, according to the present invention, the auxiliary power supply device is provided with the electric double layer capacitor bank, the charging device for charging the electric double layer capacitor bank, and the electric double layer capacitor bank according to the current setting. A current pump for supplying the current to the load, a timepiece, a load current detecting device for detecting the current of the load, and a control device for controlling the charging device and the current pump. Whether it is nighttime or daytime and peak hours during the day, the charging device is controlled to charge the electric double layer capacitor bank at night, and during the daytime, it is detected at times other than the peak hours The charging device is controlled to charge the electric double layer capacitor bank when the detected load current is small, and the load current detected in the peak time zone is adjusted. Since the current pump is controlled by setting the current to be supplied to the load so that a predetermined current is supplied, the peak power supplied from the commercial power supply can be cut and the capacity of the auxiliary power supply can be rated Since it can be kept lower, the size of the apparatus can be reduced. In addition, the peak power during the daytime can be cut by effectively using the nighttime power with less demand and the power during the light load during the daytime, which can greatly contribute to power leveling. In addition, the conventional secondary battery has a short cycle life and high cost, but by using an electric double layer capacitor bank as a power storage device, a system with high life, efficiency, and safety can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of an auxiliary power supply combined power supply system according to the present invention.
FIG. 2 is a diagram showing another embodiment of the auxiliary power supply combined power supply system according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Commercial power supply, 2 ... Electric power storage apparatus ECS, 3 ... Inverter air conditioner, 4 ... Charging apparatus, 5 ... Electric double layer capacitor bank, 6 ... Current pump, 7 ... Rectification part, 8 ... Inverter part, 9 ... Compressor and heat switch

Claims (3)

Auxiliary power supply combined power supply system for connecting an auxiliary power supply in parallel with a commercial power supply and supplying power to a load using the commercial power supply as a main power supply,
The auxiliary power supply device includes: an electric double layer capacitor bank; a charging device that charges the electric double layer capacitor bank; and a current pump that supplies a predetermined current from the electric double layer capacitor bank to the load according to a current setting. As well as
A timepiece, a load current detection device for detecting the current of the load, a control device for controlling the charging device and the current pump,
The control device determines whether it is nighttime or daytime and daytime peak time zone from the time by the clock, and controls the charging device to charge the electric double layer capacitor bank at the nighttime, During the daytime, the charging device is controlled to charge the electric double layer capacitor bank when the detected current of the load is small in a time zone other than the peak time zone, and the detection is performed in the peak time zone. An auxiliary power supply combined use power feeding system, wherein the current pump is controlled by setting the supplied current so as to supply a predetermined current to the load according to the current of the load.   The auxiliary power supply combined power feeding system according to claim 1, wherein the control device sets the supplied current to a constant current.   2. The auxiliary power supply combined power feeding system according to claim 1, wherein the control device sets the current to be supplied at a constant ratio with respect to the detected current of the load.

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