JP4799270B2 - Energy storage air conditioning system - Google Patents

Description

  The present invention relates to a power storage air conditioning system including a storage battery.

Conventionally, in order to level out the power demand throughout the day and reduce running costs, the power is stored at night when the power demand is low and the electricity bill is relatively low, and discharged according to the peak of the daytime power demand. 2. Description of the Related Art A power storage type air conditioning system including a storage battery is known. This type of energy storage air conditioning system includes a switch for switching the power supplied to the air conditioner between the commercial power supply and the storage battery, and switches the power supply to the storage battery side in accordance with the peak of power demand in the daytime. The configuration is general (see, for example, Patent Document 1).
JP-A-6-137650

However, when the power supply is switched using a switch, when the power that can be supplied by the storage battery falls below the power demand of the air conditioner, even if the power remains in the storage battery, the power of the air conditioner Since the power source is switched to a commercial power source to meet the demand, there is a problem that the power stored at night is not fully utilized.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the electrical storage type air conditioning system which can utilize more the electric power stored in the storage battery.

In order to achieve the above object, the present invention includes a plurality of outdoor units of an air conditioner and a storage battery that is charged at night and stores electric power , and the commercial power of a commercial power source together with the DC stored power of the storage battery To each of the outdoor units , and each of the outdoor units converts the commercial power into direct current, and generates electric power from the commercial power converted into direct current and the stored power supplied from the storage battery. Each of the outdoor units includes a direct current meter that detects a direct current of the supplied storage battery, and includes a power conversion device that adjusts the stored power supplied from the storage battery, and the power A plurality of sets of a conversion device and the outdoor unit are connected in parallel to the storage battery, and the storage power of the storage battery supplied to the outdoor unit is configured to be adjustable for each outdoor unit, and the power conversion device Calculate the stored power supplied from the storage battery to each outdoor unit based on the current value and output voltage of each DC ammeter, and compare the stored power for each outdoor unit to determine the power demand of each outdoor unit When the total power consumption of the commercial power consumed by all outdoor units exceeds a predetermined threshold during the time when the storage battery is not charged, the inside of the outdoor unit in the power demand is instructed to raise the consumption of stored power of the storage battery relative to a relatively large outdoor unit, the remaining power of the battery is predetermined remaining before reaching the peak hours of the electric power demand A controller is provided that instructs each of the outdoor units to reduce the amount of power stored in the storage battery when the amount is below an amount threshold.

Further, the present invention is the above invention, wherein the outdoor unit includes a power supply circuit that is supplied with DC stored power of the storage battery and commercial power of the commercial power source and generates the power source power, A rectifier circuit that rectifies the commercial power; and a smoothing circuit that is connected to the rectifier circuit and smoothes the commercial power rectified by the rectifier circuit. The output voltage of the storage battery is applied to the smoothing circuit. It is characterized by that.

Moreover, the present invention is characterized in that, in the above-mentioned invention, the power conversion device adjusts the stored power of the storage battery supplied to the outdoor unit by raising and lowering an output voltage applied to the smoothing circuit.

  According to the present invention, the commercial power of the commercial power supply is supplied to the air conditioner together with the direct current power of the storage battery, the air conditioner converts the commercial power to direct current, and the power is supplied from the commercial power converted to direct current and the power supplied from the storage battery. Since it is a configuration that generates power, the DC power of the storage battery is used with the power consumption of the air conditioner, so that the power stored in the storage battery can be used up, so that the power of the storage battery can be used more Can do.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a power storage air conditioning system 1 according to the present embodiment. As shown in this figure, the energy storage air-conditioning system 1 includes N (N ≧ 1) outdoor units 2-1 to 2-N of an air conditioner (not shown). And N power conversion devices 4-1 to 4-N provided for each outdoor unit 2 and supplying the power of the power storage unit 3 to the outdoor unit 2 (not particularly distinguished) In this case, the reference numeral “4” is attached).

  The power storage unit 3 includes a storage battery 10, a charging device 11, a remaining amount detector 12, and a controller 13. The charging device 11 charges the storage battery 10 under the control of the controller 13, and incorporates a converter circuit 11 connected to the commercial power supply line L 1 -A of the commercial power supply 6, The storage battery 10 is charged by converting commercial power into direct current. The controller 13 has a built-in timer circuit 15 that causes the charging device 11 to perform a charging operation during the night when the power demand is low and the electricity bill is low. The remaining amount detector 12 detects the remaining amount of power of the storage battery 10 and outputs it to the controller 13. The N power conversion devices 4-1 to 4-N are connected in parallel to each other through the DC power supply line L2 to the storage battery 10 of the storage unit 3, and each power conversion device 4 stores the power of the storage battery 10. It supplies to the outdoor unit 2 through the power supply line L3.

  Each of the outdoor units 2 is driven by DC power, and has a load Z (see FIG. 2) such as a DC fan motor or a DC twin rotary compressor (both not shown). A power supply circuit 20 for supplying power. The power conversion device 4 is connected to the power supply circuit 20 via the stored power supply line L3, and DC power is supplied from the power conversion device 4 and also connected to the commercial power supply line L1-B of the commercial power supply 6. Commercial power is also supplied from the commercial power supply 6, and the outdoor unit 2 is driven by supplying DC power and commercial power from the storage battery 10 to the load Z as power supply power.

  The configuration of the power supply circuit 20 will be described in detail. As shown in FIG. 2, the power supply circuit 20 rectifies AC commercial power from the commercial power supply 6 and outputs a predetermined rectified voltage V1 as a bridge diode circuit. 30 and an electrolytic capacitor 31 as a smoothing circuit that smoothes the pulsating current output from the bridge diode circuit 30 and converts it into a direct current, and the potential difference between both electrodes of the electrolytic capacitor 31 is a predetermined power supply voltage Vout ( <Rectified voltage V1) is taken out and supplied to the load Z of the outdoor unit 2. The power supply circuit 20 shown in FIG. 2 is configured when the commercial power supply 6 is a single-phase alternating current. When the commercial power supply 6 is a three-phase alternating current, a rectifying bridge diode circuit is provided for each phase. The output terminal of the diode circuit is connected to the electrolytic capacitor 31.

  Further, in the power supply circuit 20, the power converter 4 is connected to a node 32 between the rectifier circuit and the smoothing circuit, that is, a node 32 between the bridge diode circuit 30 and the positive electrode side of the electrolytic capacitor 31. The output terminal is connected, the output voltage V2 (> power supply voltage Vout) of the power converter 4 is applied to the node 32, and the stored power is supplied to the load Z together with the commercial power from the commercial power supply 6. Thereby, the power of the storage battery 10 is consumed with the power consumption of the load Z of the outdoor unit 2.

Thus, since the power of the storage battery 10 is consumed as a part of the power consumption of the outdoor unit 2, the consumption of commercial power is reduced during the peak hours of daytime power demand, and the power demand is leveled. Since the output end of the power conversion device 4 is connected to the load Z of the outdoor unit 2, the power of the storage battery 10 is supplied to the load Z until the remaining power of 10 is exhausted. It becomes possible to use up 10 electric power.
Further, a backflow prevention diode 33 is inserted between the power conversion device 4 and the node 32, and the output voltage V2 of the power conversion device 4 is changed to the bridge diode circuit 30 by using up the power of the storage battery 10 or the like. Even if the voltage falls below the rectified voltage V1, the backflow of the current to the storage battery 10 is prevented.
Furthermore, since the output terminal of the power converter 4 is connected to the node 32 between the bridge diode circuit 30 as the rectifier circuit and the electrolytic capacitor 31 as the smoothing circuit, even if a power failure occurs, The reverse flow of the electric power of the storage battery 10 to the power source 6 side is prevented by the bridge diode circuit 30.

By the way, if it is set as the structure which consumes the electric power of the storage battery 10 according to the electric power consumption of the load Z at all times, in the time slot | zone other than the night when the storage battery 10 is charged, all the outdoor units 2 will start from morning. Depending on the operating status (power demand status) of each outdoor unit 2 such as being in operation, the power of the storage battery 10 is used up before reaching the peak time of power demand, making it impossible to equalize the power demand. There is a fear.
Therefore, in the present embodiment, the controller 13 controls each power conversion device 4 according to the remaining power of the storage battery 10 and the current time zone, and adjusts the power of the storage battery 10 supplied to each outdoor unit 2. It is said. Hereinafter, the configuration will be described in detail.

  The adjustment of the electric power of the storage battery 10 supplied to the outdoor unit 2 will be described. As shown in the forward leaning diagram 2, in the power supply circuit 20, when the power consumption of the load Z of the outdoor unit 2 is W3, the bridge diode circuit 30 When the currents I1 and I2 flow from the power converter 4 to the node 32, the commercial power W1 of “V1 × I1” is supplied from the commercial power supply 6, and “V2 × The stored power W2 of “I2” is supplied.

  At this time, since the output voltage V1 and the power supply voltage Vout of the bridge diode circuit 30 are substantially constant values, based on Kirchhoff's law, the current I1 from the bridge diode circuit 30 is the output voltage V1 of the bridge diode circuit 30 and the power supply voltage Vout. The current I2 from the power converter 4 is proportional to the potential difference (V2-Vout) between the output voltage V2 of the power converter 4 and the power supply voltage Vout.

That is, as the potential difference (V2−Vout) is increased, the current I2 of the power conversion device 4 is increased and the stored power W2 (= V2 × I2) supplied from the power conversion device 4 is increased. As the potential difference (V2−Vout) is reduced (however, V2> Vout), the current I2 of the power conversion device 4 decreases, and the stored power W2 supplied from the power conversion device 4 decreases.
Therefore, in this embodiment, as shown in FIG. 1 and FIG. 2, each power conversion device 4 is provided with a step-up / down circuit 40, and the step-up / down circuit 40 raises / lowers the output voltage V2 of the power conversion device 4. The stored power W2 supplied to the outdoor unit 2 is adjusted.

  In addition, as shown in FIG. 1, each power conversion device 4 is provided with a DC ammeter 41 that detects the magnitude of the current I <b> 2 flowing from the power conversion device 4 to the outdoor unit 2. 3 obtains the value of the current I2 detected by the DC ammeter 41 and the value of the output voltage V2 of the power converter 4 via the communication line 50 at regular intervals. Then, the controller 13 calculates the stored power W2 (= V2 × I2) supplied to the outdoor unit 2 for each power conversion device 4, and the storage battery 10 of the storage battery 10 based on the sum of the stored power W2. Calculate the total power consumption. At this time, by comparing the stored power W2 for each outdoor unit 2, the power demand of each outdoor unit 2 can be relatively specified.

  Further, an AC ammeter 60 for detecting the magnitude of the AC current I3 flowing through the commercial power supply line L1-B is connected to the commercial power supply line L1-B. In synchronization with the acquisition of the value of the current I2 and the value of the output voltage V2, the value of the AC current I3 is acquired from the AC ammeter 60, and based on the value of the AC current I3 and the AC voltage value of the commercial power source 6. The total power consumption of the commercial power source 6 consumed by all the outdoor units 2-1 to 2-N is calculated.

  Under the above configuration, the controller 13 of the power storage unit 3 monitors the total power consumption of the commercial power supply 6 during a time period when charging is not performed, and the total power consumption of the commercial power supply 6 reaches a predetermined threshold value. In such a case, a boost instruction for the output voltage V2 is output to the power conversion device 4 via the communication line 50 in order to increase the consumption amount of the stored power W2 and suppress the consumption amount of the commercial power. At this time, the controller 13 does not output a boost instruction to all the power converters 4, but outputs a boost instruction to the power converter 4 of the outdoor unit 2 having a relatively large power demand. The ratio of the stored power W2 to the power demand of the outdoor unit 2 is increased.

  Furthermore, the controller 13 monitors the remaining amount of power of the storage battery 10, and when the remaining power falls below a predetermined remaining amount threshold before reaching the power demand peak time zone, the power demand peak time zone. Therefore, in order to be able to cover a certain proportion of the power demand with the power of the storage battery 10, a step-down instruction is output to the power converter 4 to keep the stored power W2 supplied to the outdoor unit 2 small. At this time, if the total power consumption of the commercial power supply 6 exceeds a predetermined threshold value, the controller 13 outputs a boost instruction to the power converter 4 instead of a step-down instruction. The magnitude of the boost is set to be lower than a predetermined value to reduce the total power consumption of the commercial power supply 6 and prevent the storage battery 10 from being depleted.

  In addition, in the period after the peak time period of power demand and before the start of charging, the controller 13 is in an outdoor area where there is power demand to use up the power of the storage battery 10 as much as possible before the start of charging. A boost instruction is output to the power conversion device 4 of the machine 2 to accelerate the consumption of the stored power W2.

As described above, according to the present embodiment, the commercial power of the commercial power supply 6 is supplied to the outdoor unit 2 together with the DC power of the storage battery 10, and the outdoor unit 2 stores the stored power W <b> 2 supplied from the commercial power W <b> 1 and the storage battery 10. Therefore, the power of the storage battery 10 is always used with the power consumption of the outdoor unit 2, and the power stored in the storage battery 10 can be used up.
Moreover, since the electric power of the storage battery 10 is consumed as a part of the electric power consumption of the outdoor unit 2, the consumption amount of the commercial electric power W1 is reduced during the peak hours of the daytime electric power demand, and the electric power demand is leveled. be able to.

  Further, according to the present embodiment, the power supply circuit 20 of the outdoor unit 2 includes the bridge diode circuit 30 as a rectifier circuit and the electrolytic capacitor 31 as a smoothing circuit, and between the bridge diode circuit 30 and the electrolytic capacitor 31. Since the configuration is such that the voltage of the storage battery 10 is applied to the node 32, the reverse flow of the stored power to the commercial power source 6 side is prevented even when a power failure occurs.

  Moreover, according to this embodiment, since it was set as the structure provided with the power converter device 4 which adjusts the electrical storage electric power W2 of the storage battery 10 supplied to the outdoor unit 2, the electrical storage electric power W2 of the storage battery 10 is changed according to the electric power demand of the outdoor unit 2. The stored power W2 supplied to the outdoor unit 2 can be adjusted according to the peak time period of the daily power demand.

  Further, according to the present embodiment, a plurality of sets of the power conversion device 4 and the outdoor unit 2 are connected in parallel to the storage battery 10, and the power of the storage battery 10 supplied to the outdoor unit 2 can be adjusted for each outdoor unit 2. Since it was set as the structure, according to the electric power demand for every outdoor unit 2, the electrical storage electric power W2 supplied to each outdoor unit 2 can be adjusted. Further, since the supply of the stored power W2 can be controlled for each outdoor unit 2, for example, the output voltage V2 of the power conversion device 4 is lowered from the power supply voltage Vout, so that a failure occurs in the plurality of outdoor units 2. It is also possible to stop the supply of the stored power W2 to the outdoor unit 2 that is present.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention.
For example, in the above-described embodiment, the configuration in which the storage battery 10 is charged with the commercial power of the commercial power source 6 has been described. However, the configuration is not limited to this, and the power generated by the solar power generation device or generated by the cogeneration system. It is good also as a structure which charges the storage battery 10 with electric power.

The figure which shows the structure of the electrical storage type air conditioning system which concerns on embodiment of this invention. The figure which shows the structure of a power circuit.

Explanation of symbols

1 Energy Storage Air Conditioning System 2, 2-1 to 2-N Outdoor unit (air conditioner)
DESCRIPTION OF SYMBOLS 3 Power storage unit 4,4-1 to 4-N Power converter 10 Storage battery 13 Controller 20 Power supply circuit 30 Bridge diode circuit (rectifier circuit)
31 Electrolytic capacitor (smoothing circuit)
40 Buck-Boost circuit

Claims (3)

A plurality of outdoor units of the air conditioner, and a storage battery that is charged at night to store electric power,
Supplying commercial power of a commercial power source together with DC stored power of the storage battery to each of the outdoor units ,
Each of the outdoor units is a storage-type air conditioning system that converts the commercial power into direct current, generates power from the commercial power converted into direct current and the stored power supplied from the storage battery,
Each of the outdoor units has a DC ammeter that detects a DC current of the supplied storage battery, and includes a power conversion device that adjusts the stored power supplied from the storage battery,
A plurality of sets of the power conversion device and the outdoor unit are connected in parallel to the storage battery, and the storage power of the storage battery supplied to the outdoor unit is configured to be adjustable for each outdoor unit,
Calculate the stored power supplied from the storage battery to each outdoor unit based on the current value and output voltage of each DC ammeter of the power converter, and compare the stored power for each outdoor unit. When the total power consumption of the commercial power source consumed by all the outdoor units exceeds a predetermined threshold in the time zone when the storage battery is not charged while allowing the power demand to be relatively compared , the instructed to raise the consumption of stored power of the storage battery to the power demand is relatively large outdoor unit in the outdoor unit, power remaining in the battery before reaching the peak hours of the electric power demand And a controller that instructs each of the outdoor units to reduce the amount of power stored in the storage battery when the amount falls below a predetermined remaining amount threshold value. Harmony system. The electricity storage type air conditioning system according to claim 1,
The outdoor unit is
DC power storage power of the storage battery and commercial power of the commercial power supply are supplied, and includes a power supply circuit that generates the power supply power,
The power supply circuit is
A rectifier circuit that rectifies the commercial power; and a smoothing circuit that is connected to the rectifier circuit and smoothes the commercial power rectified by the rectifier circuit. The output voltage of the storage battery is applied to the smoothing circuit. An electricity storage air conditioning system characterized by this. The electricity storage type air conditioning system according to claim 2 ,
The power conversion device adjusts the stored power of the storage battery supplied to the outdoor unit by raising and lowering the output voltage applied to the smoothing circuit.

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