JPH0674537A - Electricity storage type air-conditioner - Google Patents

Abstract

PURPOSE:To increase the amount of electric power shift at the daytime peak of electric power with a high efficiency and high reliability, and reduce installation capacity. CONSTITUTION:In an air conditioner wherein it includes a storage battery 8 which is charged using a commercial power supply 1 in a time zone with the reduced demand of electric power and which applies DC electric power to an inverter 15 instead of the commercial power supply 1, there is provided control means 6 for making variable a charging current in response to operation and non-operation of the present air conditioner upon the storage battery 8 being charged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage type air conditioner provided with a storage battery that stores electricity using nighttime electric power.

[0002]

2. Description of the Related Art Recently, the peak of power demand in summer or winter has become a big social problem. One of the main reasons for this is the air conditioner. In other words, when the summer is hot or the winter is cold, the air conditioners move all at once, so the power supply cannot keep up with the demand, and in the worst case, a power outage occurs. As a technical measure for solving this problem, a heat storage type air conditioner has been conventionally known. In this system, an air conditioner is operated at night when power demand is low to store or store heat in a heat storage material, and the heat is used for air conditioning during the daytime. By doing so, the peak of electric power generated in the daytime can be shifted to the nighttime, which can contribute to the leveling of the electric power demand as a whole. As a typical system, a heat storage type air conditioning system using ice as a heat storage material will be described with reference to FIG.

FIG. 4 shows a system in which ice or hot water is made in a heat storage tank using brine as an antifreeze as a heat medium, and water as a heat storage material is circulated to the load side for air conditioning. In the figure, 41 is a heat pump unit, 42 is a brine pump, 43 is a heat storage tank, 44 is a heat exchanger for brine and water, 4
5, 46 are 3-way valves, 47 is air conditioning load, 48 is water pump,
49 is a brine pipe, and 50 is a water pipe. The brine is cooled by the heat pump unit 41 by inexpensive night power, and is circulated to the heat storage tank 43 by the brine pump 42 to be transferred to the heat storage tank 4
Make ice in 3. In the daytime, the brine cooled by the heat pump unit 41 and the water returned from the air conditioning load 47 are heat-exchanged by the brine and water heat exchanger 44, then mixed with the cold water in the heat storage tank 43 and air-conditioned by the water pump 48. It is sent to the load 47 to perform cooling operation. However, in the method of making ice with a heat pump in this way, since the evaporation temperature of the refrigerant is low, the efficiency deteriorates as compared with the normal cooling operation, and energy is not saved. Furthermore, the difference between the latent heat in ice storage and the sensible heat of hot water during heating causes an imbalance between the cooling and heating abilities. In addition, a pump and a pipe for circulating the brine and water are required respectively, which complicates the configuration.
As for other heat storage air conditioning systems, the power of pumps and compressors to circulate cold water or refrigerant is required at the minimum, sufficient peak cut cannot be performed, and heat storage tank piping is required, and the configuration is complicated and the system is large. And there are various problems such as a large amount of refrigerant.

[0004]

In the conventional heat storage type heat pump air conditioner, it is impossible to perform an effective peak cut operation for leveling the electric power, an imbalance between cooling and heating capacities occurs, and the system is complicated and the system is complicated. Had the problem of becoming larger.

The present invention has been made in view of the above circumstances, and it is a storage type that can increase the amount of power shift during daytime power peaks with high efficiency and high reliability, and can reduce equipment capacity. An object is to provide an air conditioner.

[0006]

In order to solve the above-mentioned problems, the present invention firstly relates to a converter for converting AC power from a commercial power source into DC power, and DC power from the converter to AC power. An inverter for converting and supplying the compressed air to the compressor, and supplying DC power to the inverter in place of the commercial power source during the time period when the commercial power source is charged by using the commercial power source during the low power demand period. The gist of the present invention is to provide an air conditioner having a storage battery, which has a control means for varying a charging current in accordance with the operation / non-operation of the air conditioner when the storage battery is charged.

Secondly, a converter for converting AC power from a commercial power source into DC power, an inverter for converting DC power from the converter into AC power and supplying it to the compressor, and a time zone when power demand is small. A storage battery charged using the commercial power source, and direct current power to the inverter is supplied from the storage battery instead of the commercial power source in the time of a large power demand and in the case of a normal load. In this case, the gist is to have a control means for supplying power from the commercial power source and the storage battery.

[0008]

In the above structure, firstly, the storage battery is charged with inexpensive electric power at night when the electric power demand is small. At the time of this charging, the charging current is variably controlled to be large or small depending on whether the air conditioner is stopped or in operation, and an excessive current is prevented from flowing through the entire device. Then, the charging electric power is discharged at the peak electric power in the daytime to operate the air conditioner. As a result, the amount of power shift during the daytime power peak is large with high efficiency and high reliability, and power leveling becomes effective.

Second, the storage battery is charged with inexpensive electric power at night when the electric power demand is small. Then, during the daytime power peak, the air conditioner is operated by the discharge power of the storage battery when the load is normal, and when the load is maximum, the power from the commercial power source is also added to the discharge power of the storage battery to operate the air conditioner. As a result, the efficiency is high and the amount of power shift at the peak of daytime power is large, so that the leveling of electric power is effectively performed, and at the same time, the reliability of the storage battery and eventually the device is improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are views showing a first embodiment of the present invention. First, the configuration of the storage air conditioner will be described with reference to FIG. Two types of AC outputs are obtained from the commercial power source 1 by the transformer 2, one of which is converted into DC by the bridge 3 as a converter and the smoothing capacitor 4 and input to the control circuit unit 6 as control means. The other is full-wave rectified by the bridge 5 and is supplied to the storage battery 8 as charging power via the thyristor 7. The transistor 9 is turned off by the signal of the control circuit unit 6 during the nighttime power time period to turn on the thyristor 7, and is turned on during the other time period to turn off the thyristor 7. As a result, the storage battery 8 is charged through the thyristor 7 during the night time. The charging current is detected by the current transformer 11, the difference between it and the reference voltage is taken by the operational amplifier 12, and it is fed back to the transistor 10. Here, if the charging current is larger than the set value (reference voltage), the base current of the transistor 10 increases and the gate voltage of the thyristor 7 is lowered to delay the trigger phase angle and reduce the charging current. If the charging current is less than the set value, the trigger phase angle of the thyristor 7 is advanced to increase the charging current, and constant current charging is performed. The first switch 13 is for switching the reference voltage. When the compressor 16 is operated during charging, the reference voltage is set low, and when it is stopped, the reference voltage is set high to set an excessive current to the entire device. To prevent the flow. The second switch 14 is switched to the storage battery side 14b during the peak power hours, and switched to the commercial power source side 14a during the other time zones.
DC power is supplied to the inverter unit 15 from the storage battery 8 or the commercial power source 1 side. Inverter section 15
Then, this DC power is converted into AC power and the compressor 16 is driven.

Next, the operation will be described with reference to the flowchart of FIG. The storage battery 8 is charged during the nighttime power hours (YES in step 21). By the control of the control circuit unit 6, the charging current is set to be large when the air conditioner is stopped, and is set to be large when the air conditioner is in operation to prevent an excessive current from flowing through the entire device (step 22). ~ 24). Further, when it is not the nighttime power time zone, DC power is supplied from the commercial power source 1 side to the inverter unit 15 at times other than the power peak time zone, and by the storage battery 8 during the power peak time zone, a large power peak is generated. A shift is performed (steps 25-27).

Next, FIG. 3 shows a second embodiment of the present invention. 3 that are the same as or equivalent to the devices, elements and the like in FIG. 1 are designated by the same reference numerals as those used above, and a duplicate description will be omitted.

The output DC-converted by the bridge 3 and the smoothing capacitor 4 is input to the charging circuit section 32 via the control circuit section 31 as the control means and the first switch 33. 34 is a second switch, and this switch 3
Reference numeral 4 is closed only during the peak power hours, and DC power from the storage battery 8 is supplied to the inverter unit 15. The first switch 33 in the cheap night power hours
The storage battery 8 is charged by closing, and the first switch 33 is opened during the other time zones. The diodes 35 and 36 are for preventing backflow. The second switch 34 is closed by the control circuit unit 31 during the peak power hours, but if the direct current voltage from the control circuit unit 31 is set lower than the voltage of the storage battery 8, the storage battery 8 will be discharged under normal load. As a result, DC power is supplied to the inverter unit 15 via the diode 36. When the load requires a large current, the voltage of the storage battery 8 drops, and DC power is supplied from the commercial power source 1 side to the inverter unit 15 via the control circuit unit 31 and the diode 35.

[0015]

As described above, according to the present invention, firstly, when the storage battery is charged in a time period when the power demand is small, it is charged according to the operation / non-operation of the air conditioner. Since the current is made variable, it is possible to prevent an excessive current from flowing through the entire device, and it is possible to increase the power shift amount during the daytime power peak with high efficiency and high reliability. Since no heat storage tank is required, the equipment capacity can be reduced.

Secondly, the DC power to the inverter is supplied from the storage battery instead of the commercial power supply when the power demand is large and when the load is normal, and from the commercial power supply and the storage battery when the load is maximum. As a result, it is possible to increase the power shift amount at the peak of daytime power with high efficiency, and at the same time, improve the reliability of the storage battery and eventually the device.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of a storage-type air conditioner according to the present invention.

FIG. 2 is a flow chart for explaining the operation of the first embodiment.

FIG. 3 is a circuit diagram showing a second embodiment of the present invention.

FIG. 4 is a system diagram of a conventional heat storage type air conditioner.

[Explanation of symbols]

 1 Commercial power supply 3 Bridge 6, 31 used as a converter Control circuit unit (control means) 8 Storage battery 15 Inverter unit 16 Compressor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Saito 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Incorporated, Toshiba Living Space Systems Engineering Laboratory (72) Inventor Katsuaki Yamagishi 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Address Company, Toshiba Living Space Systems Technology Laboratory (72) Inventor Koichi Yamaguchi 8 Shinsita-cho, Isogo-ku, Yokohama, Kanagawa Prefecture In-house Toshiba Housing Space Systems Technology Laboratory (72) Inventor Takashi Doi Isoko, Yokohama City, Kanagawa Prefecture Shin-Sugita-cho, Tokyo-ku, Ltd. In the Toshiba Housing and Space Systems Technology Laboratory, Inc. (72) Inventor Masaki Imamura 3-3-9 Shimbashi, Minato-ku, Tokyo Inside Toshiba Abu E., Ltd.

Claims (2)

[Claims] 1. A converter for converting AC power from a commercial power source into DC power, an inverter for converting DC power from the converter to AC power and supplying the same to a compressor, and the converter for reducing the power demand. In an air conditioner having a storage battery that is charged using a commercial power source and supplies DC power to the inverter instead of the commercial power source during a time period when the power demand is large, the air conditioning device when the storage battery is charged. An electric storage air conditioner having a control means for varying the charging current according to the operation / non-operation of the above. 2. A converter for converting AC power from a commercial power source into DC power, an inverter for converting DC power from the converter into AC power and supplying the same to a compressor, and the converter in a time period when power demand is low. A storage battery charged using a commercial power source and direct current power to the inverter are supplied from the storage battery instead of the commercial power source in a time zone of large power demand and in the case of normal load, and in the case of maximum load. A storage-type air conditioner, comprising: a control unit that is supplied from the commercial power source and a storage battery.