JP4601507B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system, and more particularly, to a storage battery discharge control technique in an air conditioning system including a storage battery that stores nighttime power.

Reduction of CO2 to prevent intermediate warming is socially desired.
In order to achieve such an object, conventionally, as an air conditioning system, for example, as disclosed in Patent Document 1, air having a storage battery that stores nighttime power and discharges it at the peak of daytime power demand. A harmony system has been proposed.

According to this air-conditioning system, the battery is charged with midnight power, which is the surplus power at night, and the peak power is suppressed by efficiently discharging the cooling and heating during the daytime during peak power hours. By reducing the amount, electric power was leveled, and as a result, it contributed to CO2 reduction.
JP-A-6-304595

In such an air conditioning system using a storage battery, in order to prevent the power used from exceeding the contracted power, the power stored in the midnight power is a power conversion circuit that constitutes the air conditioner during a time when the demand for power in the daytime is high. The configuration is such that the compressor motor is driven via a certain inverter to drive the compressor motor.
Furthermore, in such an air conditioning system, it is generally desired to perform control so that the power used does not exceed the contract power.
However, the amount of power used varies from one air conditioning system to another, and when uniform control is performed, the battery is charged more than necessary, or the amount of power stored is insufficient and the used power is contracted. There was a possibility of exceeding.

Then, the objective of this invention is providing the air conditioning system which can perform the storage-discharge control of a storage battery efficiently so that it may become optimal for the user of each air conditioning system.
Is to provide.

In order to solve the above problems, an air conditioning system includes a storage battery, a storage / discharge control device that stores and discharges the storage battery, an air conditioning device that performs air conditioning based on electric power from a commercial power source or the storage battery, A measuring unit that measures electric power supplied from a commercial power source, wherein the storage / discharge control device exceeds the allowable power consumption CPlim defined in advance based on contract power, and the allowable power consumption When the time for which the amount of power used continues to rise beyond CPlim exceeds a predetermined reference time, the storage battery is discharged and stored at midnight power, and if it is in a dischargeable state, the current power consumption It is determined whether or not the amount CP exceeds the allowable power consumption CPlim, and as a result, if there is a possibility of exceeding the contract power consumption, the storage is continued until the allowable power consumption CPlim is not exceeded. If the discharge amount is set on the side that increases the discharge amount of the battery and there is no possibility of exceeding the contracted power amount, if the storage battery is discharging, the discharge amount is set on the side that reduces the discharge amount of the storage battery. Alternatively, the discharge amount in the discharge is controlled so that the discharge is stopped.

  According to the above configuration, the measurement unit measures the power or current supplied from the commercial power supply, and the storage / discharge control device determines that the measured value of the power or the current is a predetermined reference value based on the measurement result of the measurement unit. And when the storage battery is discharged when the time exceeding the predetermined reference value exceeds the predetermined reference time, the power or current supplied from the commercial power source is the predetermined set power or the predetermined set current. The amount of discharge is controlled to be as follows. On the other hand, an air conditioning apparatus will perform air conditioning based on the electric power from a commercial power supply or a storage battery.

In this case, the storage / discharge control apparatus may include a storage amount calculation unit that calculates a storage amount in the storage battery.
Moreover, the said storage / discharge control apparatus may memorize | store the discharge pattern of the said storage battery beforehand, and you may make it perform the said discharge according to the said discharge pattern.
Furthermore, the storage / discharge control device may store a power storage pattern during the power storage in advance and perform the power storage according to the power storage pattern.

Still further, the storage / discharge control device may perform control so that the discharge amount falls within a predetermined upper limit discharge amount and lower limit discharge amount when the storage battery is discharged.
The air conditioner may include an inverter having a direct current circuit unit, and the storage / discharge control device may be connected to the direct current circuit unit.
Further, the storage / discharge control device may discharge DC power during the discharge, and the discharge amount may be controlled based on the voltage of the DC power.

  According to the present invention, the power or current supplied from the commercial power supply can be made equal to or less than the predetermined allowable power or allowable current, and the used power can be prevented from exceeding the contract power.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a schematic configuration of a power storage type air conditioning system according to an embodiment.
The power storage type air conditioning system 1 includes an air conditioner group 2, a power storage unit 3, and a PCS controller 4. Here, the air conditioner group 2 includes an outdoor unit and a plurality (two in FIG. 1) of air conditioners 2A and 2B including one or a plurality of indoor units connected to the outdoor unit by a refrigerant circuit. Each air conditioner 2A, 2B is connected in parallel to an AC load line 11 to which, for example, AC 200V is supplied.

  The power storage unit 3 is connected to a power storage power supply line 13 branched from a power supply line 12 from a commercial power supply 10 that supplies AC power of AC 200 V, for example, and stores commercial power. Here, the power storage unit 3 includes a DC power source 30, a power storage air-conditioning controller 31, a battery charger 32, a storage battery 33, and a remaining capacity detector 34 that detects the remaining battery capacity of the storage battery 33. . The storage power supply line 13 is branched into two systems, a DC power supply 30 is connected to the first storage power supply line system 13A, and a battery charger 32 is connected to the second storage power supply line system 13B. .

The DC power source 30 generates operating power for various circuits.
The DC power source 30 converts AC power from the commercial power source 10 into DC power having a predetermined voltage (for example, 5 V) and supplies the DC power to the power storage air conditioning controller 31.
The power storage air-conditioning controller 31 functions as a storage / discharge control device that controls the power storage / discharge of the power storage unit 3. For example, the power storage circuit 31 B detects the AC power amount from the memory 31 A such as an EEPROM and the commercial power supply 10. Built-in, storage / discharge control is performed in accordance with the actual AC power amount detected by the power detection circuit 31B and the control program stored in the memory 31A. More specifically, the storage battery 33 is discharged when the actual amount of AC power detected by the power detection circuit 31B exceeds a predetermined reference value and a time exceeding the predetermined reference value exceeds a predetermined reference time. At the same time, the amount of discharge in the discharge is controlled so that the power supplied from the commercial power supply 10 is equal to or lower than a predetermined set power.

The battery charger 32 incorporates a converter circuit 32A that converts AC power from the commercial power supply 10 into DC power and outputs the DC power. Under the instruction of the power storage air conditioning controller 31, the DC power is supplied via the battery charging line 14. Supplied to the storage battery 33. In the present embodiment, the power storage air-conditioning controller 31 outputs a charge start signal to the storage battery 33 to the battery charger 32 during the night power hours when the power demand is relatively small during the day. Thereby, charge to the storage battery 33 is started. In this multiplication, the battery charger 32 stores a power storage pattern during power storage in advance, and is configured to perform power storage according to the power storage pattern.
The storage battery 33 is a lead storage battery or a battery such as a nickel-cadmium battery, a nickel-hydrogen battery, a nickel-zinc battery, a sodium-sulfur battery, a sodium-nickel chloride battery (zebra battery), or a lithium battery. The stored electric power is output to the PCS controller 4 through the battery discharge line 15 drawn out from.
The remaining amount detector 34 detects the voltage of the storage battery 33 to detect the remaining amount of the battery, and notifies the power storage air conditioning controller 31.

  The PCS controller 4 is interposed between the power supply line 12 from the commercial power supply 10 and the AC load line 11, and under the instruction of the power storage air conditioning controller 31, the stored power is linked to the commercial power at a predetermined ratio to generate AC. This is output to the load line 11. That is, the PCS controller 4 includes an inverter circuit 4A that is connected to the battery discharge line 15 and converts the DC power supplied from the storage battery 33 into AC power and outputs the AC power to the AC load line 11. 31A outputs a switching control signal to the PCS controller 4 so that the power stored in the storage battery 33 is supplied to the AC load line 11 at a predetermined rate during the daytime when the power demand is relatively large during the day. And control is performed so that commercial power is supplied during other time periods.

  According to the power storage air conditioning system 1 having such a configuration, the power storage air conditioning controller 31 controls the PCS controller 4 so that the stored power and commercial power of the storage battery 33 are supplied to the AC load line 11 during the peak time of power demand. Since only commercial power is supplied to the AC load line 11 during other time periods, stored power and commercial power are supplied from the storage battery 33 during daytime periods when the power demand peaks. Since the air conditioners 2A and 2B are operated and the storage battery 33 is charged at night when the power demand is small, the consumption amount of the commercial power supply 10 at the time of power peak is suppressed.

Next, the detailed operation of the embodiment will be described.
FIG. 2 is a processing flowchart of the embodiment.
First, the power storage air conditioning controller 31 determines whether or not the storage battery 33 is in a dischargeable state based on the current time and the remaining battery level notified from the remaining capacity detector 34 (step S1).
If it is determined in step S1 that the battery is not in a dischargeable state (step S1; No), specifically, when charging is performed at midnight power, or the remaining battery level is less than a predetermined remaining dischargeable determination level. It will be in a standby state.

If it is determined in step S1 that the battery can be discharged (step S1; Yes), the current power consumption CP exceeds the allowable power consumption CPlim based on the detection result of the power detection circuit 31B. It is determined whether or not there is (step S2). Here, the allowable power consumption CPlim is determined in advance based on the contract power.
If it is determined in step S2 that the current power consumption CP exceeds the allowable power consumption CPlim (step S2; Yes), that is, if there is a possibility of exceeding the contract power consumption, It is determined whether or not the state in which the power amount CP exceeds the allowable power consumption amount CPlim has continued for a predetermined time or longer (step S3).
If it is determined in step S3 that the current power consumption CP exceeds the allowable power consumption CPlim for a predetermined time or longer (step S; Yes), the discharge amount of the storage battery 33 is increased. The discharge amount is set on the side (+ side) (step S4), and the PCS controller 4 is instructed to link the stored power to the commercial power at a predetermined ratio and output it to the AC load line 11. That is, the inverter circuit 4A of the PCS controller 4 causes the storage battery 33 to start discharging via the battery discharge line 15 (step S5), converts the DC power supplied from the storage battery 33 into AC power, and supplies the AC load line 11 with the AC power. Output.

In this case, the control of the discharge amount is performed based on the voltage of the DC power supplied to the inverter circuit 4A.
Then, the process proceeds to step S1 again to perform the same process, and the discharge amount from the storage battery 33 is increased until the current power consumption CP does not exceed the allowable power consumption CPlim. In this case, an upper limit value and a lower limit value are determined for the discharge amount of the storage battery 33, and the discharge amount is set within the range. Here, the reason why the upper limit is set is to prevent the battery from being deteriorated due to overdischarge. The reason why the lower limit value is set is that the discharge of the lower limit value or less deteriorates the efficiency of the entire system from the viewpoint of the efficiency of the inverter circuit 4A and the like.
If it is determined in step S3 that the state in which the current power consumption CP exceeds the allowable power consumption CPlim continues for less than a predetermined time, the process proceeds to step S2 again and the same process is performed. .
If it is determined in step S2 that the current power consumption CP is less than the allowable power consumption CPlim, it is determined whether or not the current storage battery 33 is being discharged (step S6).
If it is determined in step S6 that the storage battery 33 is not currently discharging (step S6; No), the process proceeds to step S1, and thereafter the same process is performed.
If it is determined at step S6 that the storage battery 33 is currently discharging (step S6; Yes)

On the other hand, if it is determined in step S2 that the current power consumption CP is less than the allowable power consumption CPlim (step S2; No), that is, it is considered that there is no possibility of exceeding the contract power consumption. Determines whether or not it is currently discharging (step S6).
If it is determined in step S6 that the battery is currently being discharged (step S6; Yes), the discharge amount is set on the side where the discharge amount of the storage battery 33 is decreased (-side; including discharge stop) (step S5). The PCS controller 4 is instructed to link the stored power to the commercial power at a predetermined ratio and output the AC power to the AC load line 11 or to output only the commercial power to the AC load line 11. Then, the process proceeds again to step S1, and the same process is performed.
If it is determined in step S6 that no discharge is currently being performed (step S6; No), the process returns to step S1 and the same process is performed.

A specific operation example will be described below.
FIG. 3 is a timing chart of an operation example.
In this case, it is assumed that the storage of the storage battery 33 by midnight power is completed at time t0.
As a result, after time t0, the power storage air conditioning controller 31 determines that the storage battery 33 is in a dischargeable state based on the current time and the remaining battery level notified from the remaining battery level detector 34.

Then, at time t1, when the current commercial power consumption CP exceeds the allowable power consumption CPlim, it is determined whether or not the state continues for a predetermined time tref or more. At this time t1, since the current commercial power consumption CP has just exceeded the allowable power consumption CPlim, a standby state is entered.
After that, when time t2 is reached, that is, when the current commercial power consumption CP exceeds the allowable power consumption CPlim for a predetermined time tref or longer, the contract power consumption may be exceeded. Therefore, the discharge amount (= discharge power amount) is set to BP1 on the side (+ side) on which the discharge amount of the storage battery 33 is increased, and the PCS controller 4 is instructed to link the stored power with the commercial power to the AC load line. 11 to output. That is, the inverter circuit 4A of the PCS controller 4 causes the storage battery 33 to start discharging via the battery discharge line 15, and converts the DC power supplied from the storage battery 33 into AC power (= corresponding to the discharge power amount BP1). Output to the AC load line 11.

After that, when the current commercial power consumption CP exceeds the allowable power consumption CPlim again at time t3, it is determined whether or not the state continues for a predetermined time tref or more. At the time t3, the current commercial power usage CP has just exceeded the allowable power usage CPlim, and the standby state is entered.
After that, when time t4 is reached, that is, when the current power consumption CP of the commercial power exceeds the allowable power consumption CPlim for a predetermined time tref or longer, there is a possibility of exceeding the contract power consumption thereafter. Therefore, the discharge amount (= discharge power amount) is set to BP2 (> BP1) on the side that increases the discharge amount of the storage battery 33 (+ side), and the PCS controller 4 is instructed to link the stored power to the commercial power. Output to the AC load line 11. That is, the inverter circuit 4 </ b> A of the PCS controller 4 converts the DC power supplied from the storage battery 33 via the battery discharge line 15 into AC power (= corresponding to the discharge power amount BP <b> 2) and outputs the AC power to the AC load line 11.

  After that, at time t5, when it is considered that there is no possibility that the current power consumption CP is less than the allowable power consumption CPlim and there is no possibility of exceeding the contract power consumption, the discharge amount of the storage battery 33 is decreased. The discharge amount (= discharge power amount) is set to BP1 again on the side to be made (−), and the PCS controller 4 is instructed to link the stored power to the commercial power and output it to the AC load line 11. That is, the inverter circuit 4 </ b> A of the PCS controller 4 converts the DC power supplied from the storage battery 33 through the battery discharge line 15 into AC power (= corresponding to the discharge power amount BP <b> 1) and outputs it to the AC load line 11. .

Thereafter, at time t6, if the current power consumption CP is less than the allowable power consumption CPlim again, the current state is maintained.
At time t7, when the current power consumption CP continues to be less than the allowable power consumption CPlim and there is no possibility of exceeding the contract power consumption, the discharge amount of the storage battery 33 is decreased. The discharge amount (= discharge power amount) is set to 0 on the side (− side) to stop the discharge, and the PCS controller 4 is instructed to output only the commercial power to the AC load line 11.
As described above, according to the present embodiment, the power or current supplied from the commercial power supply can be set to a predetermined allowable power or allowable current or less, and the used power exceeds the contract power. Can be prevented.

In the above description, the case where the discharge pattern of the storage battery is changed at any time based on the allowable power consumption CPlim has been described. However, the basic discharge pattern of the storage battery is stored in advance, and in principle, this discharge pattern. The discharge may be performed according to the following.
In the above description, the case where there is one storage battery has been described. However, the present invention can be similarly applied to a case where a plurality of storage batteries are provided.
In the above description, the storage / discharge control apparatus controls the discharge amount to be within a predetermined upper limit discharge amount and lower limit discharge amount when the storage battery is discharged. May be.

It is a block diagram which shows schematic structure of the electrical storage type air conditioning system which concerns on this Embodiment. It is a processing flowchart of an embodiment. It is a timing chart of an operation example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power storage type air conditioning system 2 Air conditioner group 2A, 2B Air conditioner 3 Power storage unit 4 PCS controller 10 Commercial power supply 11 AC load line 12 Power supply line 13 Power storage power supply line 30 DC power supply 31 Power storage air conditioning controller (storage / discharge control device)
32 battery charger 33 storage battery 34 remaining amount detector 31A memory 31B power detection circuit (measurement unit)

Claims (7)

A storage battery,
A storage / discharge control device for storing and discharging the storage battery;
An air conditioner that performs air conditioning based on power from a commercial power source or the storage battery;
A measurement unit for measuring the power supplied from the commercial power source,
The storage / discharge control device has a predetermined reference time during which the power exceeds the allowable power consumption CPlim defined in advance based on the contract power and the power consumption continues to increase beyond the allowable power consumption CPlim. If it exceeds, the storage battery is discharged and stored at midnight power, and if it is in a dischargeable state, it is determined whether or not the current power consumption CP exceeds the allowable power consumption CPlim. As a result, if there is a possibility of exceeding the contracted power amount, the discharge amount may be set on the side that increases the discharge amount of the storage battery until the allowable power consumption CPlim is not exceeded, and the contracted power amount may be exceeded. If not, if the storage battery is discharging, the air conditioning is characterized in that the discharge amount is set on the side to decrease the discharge amount of the storage battery or the discharge amount in the discharge is controlled so as to stop the discharge. Shi Temu. The air conditioning system according to claim 1,
The storage / discharge control apparatus includes an electricity storage amount calculation unit that calculates an electricity storage amount in the storage battery. The air conditioning system according to claim 1,
The said storage / discharge control apparatus has memorize | stored the discharge pattern of the said storage battery beforehand, and performs the said discharge according to the said discharge pattern, The air conditioning system characterized by the above-mentioned. The air conditioning system according to claim 1,
The air storage system is characterized in that the storage / discharge control device stores in advance a power storage pattern during power storage and performs the power storage according to the power storage pattern. The air conditioning system according to any one of claims 1 to 4,
When the storage battery discharges the storage battery, the storage / discharge control device performs control so that the discharge amount falls within a predetermined upper limit discharge amount and lower limit discharge amount. The air conditioning system according to any one of claims 1 to 5,
The air conditioner includes an inverter having a DC circuit unit,
The air-conditioning system, wherein the storage / discharge control device is connected to the DC circuit unit. The air conditioning system according to any one of claims 1 to 6,
The storage / discharge control device discharges direct-current power during the discharge, and the discharge amount is controlled based on the voltage of the direct-current power.

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