JP6344176B2 - Power supply equipment and operation method thereof - Google Patents

Description

  The present invention relates to a power supply facility that supplies power to a load and an operation method thereof.

  In recent years, power supply facilities in which a storage battery is combined with a commercial power source or the like have been put to practical use as a power source for a wireless base station or a server room. Moreover, the thing provided with two or more such storage batteries is proposed (for example, refer patent documents 1 and 2). When a plurality of storage batteries are provided, control for integrating and managing charge / discharge is required. For example, in the power supply facility of Patent Document 1, when one storage battery is discharged and supplying power to the DC bus, the other storage battery is charged by the voltage of the DC bus. Thereby, the voltage of the DC bus can be kept constant. Further, in the power supply facility of Patent Document 2, control is performed such that the assembled batteries divided into two groups shift the charging timing with respect to each other.

  On the other hand, power supply facilities using a plurality of storage batteries whose main purpose of use are also in demand on the market. For example, one of the purposes of using a storage battery is for emergency backup such as a power failure. For such an application, an inexpensive lead-acid battery that is less deteriorated even if it is not used while fully charged is suitable. Another purpose is peak shift. For example, night electricity that is less expensive than daytime is stored in a storage battery and discharged during the daytime. Moreover, the electric power of solar power generation can be stored in a storage battery and discharged at night to be used. As such a storage battery, for example, a lithium ion battery resistant to repeated charge and discharge is suitable.

  In general, backup storage batteries are widely used, but storage batteries for peak shift and the like are not so popular yet. Therefore, the demand for adding a peak shift storage battery to a power supply facility that already has a backup storage battery is expected to increase in the future.

Patent No. 5028517 Patent No. 4933465

  However, like patent document 1 or 2, the control which integrates and manages charge / discharge of a some storage battery is complicated, and manufacture is difficult. As a result, it is difficult to manufacture at a low cost. Further, when a plurality of types of storage batteries having different purposes of use are provided due to the expansion, the control for integrated management becomes more difficult.

  In view of such conventional problems, an object of the present invention is to provide a power supply facility that can easily realize independent charge / discharge control for each storage battery having a different purpose of use.

The present disclosure includes the following inventions. However, the present invention is defined by the claims.
A power supply facility according to the present invention is a power supply facility that supplies power to a load, and includes a DC bus having a capacity of a capacitor, a constant voltage power supply device that supplies power to the DC bus via a diode, A backup storage battery that discharges to supply power to the DC bus when the constant voltage power supply is interrupted and is charged based on the voltage or the output voltage of the constant voltage power supply, and the DC bus A cycle storage battery that performs a cycle of charging by voltage and discharging for providing power to the DC bus more routinely than the backup storage battery, and between the DC bus and the cycle storage battery While interposing the bidirectional converter, the voltage of the DC bus and a threshold value are compared, and the converter is charged or discharged with the cycle storage battery. The threshold was in changing the conditions of the charging and discharging to variably set, and the discharge of the cycle storage battery is provided with a control unit that to be preferentially performed than the discharge of the backup battery.

  In addition, the operation method of the power supply facility of the present invention includes a constant voltage power supply device that supplies power to a load from a DC bus having a capacity of a capacitor and supplies power to the DC bus via a diode, Alternatively, when the constant voltage power supply is charged based on the output voltage of the constant voltage power supply and a power failure occurs, a backup storage battery that discharges to supply power to the DC bus, and the voltage of the DC bus And a cycle storage battery that executes a cycle of charging and discharging for supplying power to the DC bus more routinely than the backup storage battery, and interposed between the DC bus and the cycle storage battery A bi-directional converter, and a method of operating a power supply facility comprising: comparing the DC bus voltage with a threshold value; The charge / discharge condition is changed by variably setting the threshold value, and the discharge of the cycle storage battery is performed preferentially over the discharge of the backup storage battery. The operation method of the power supply equipment.

  ADVANTAGE OF THE INVENTION According to this invention, the electric power feeding equipment which can implement | achieve the independent charging / discharging control for every storage battery from which a use objective differs can be provided.

It is a connection diagram which shows the electric power feeding installation which concerns on 1st Embodiment, and has shown the threshold value of charging / discharging in charge mode. It is a circuit diagram of the conversion apparatus of the storage battery for cycles in FIG. It is a connection diagram which shows the electric power feeding installation which concerns on 1st Embodiment, and has shown the threshold value of charging / discharging in discharge mode. It is a graph which shows the relationship between the voltage of the DC bus in charge mode, and charging / discharging of each storage battery. It is a graph which shows the relationship between the voltage of the DC bus in discharge mode, and charging / discharging of each storage battery. It is a graph which shows the example of a change of the daily power consumption in a consumer. It is a connection diagram which shows the electric power feeding installation which concerns on 2nd Embodiment. It is a connection diagram which shows the electric power feeding installation which concerns on 3rd Embodiment. It is a graph which shows the relationship between the voltage of the DC bus in the charge mode of 3rd Embodiment, and charging / discharging of each storage battery. It is a graph which shows the relationship between the voltage of the DC bus in the discharge mode of 3rd Embodiment, and charging / discharging of each storage battery. It is a connection diagram which shows the electric power feeding installation which concerns on 4th Embodiment. In the power supply facility of FIG. 11, the commercial power supply is cut off and solar power generation is not performed (night time). FIG. 13 is a connection diagram showing a state when the backup storage battery is discharged from the state of FIG. 12 and there is no remaining amount sufficient to supply power to the DC load.

[Summary of Embodiment]
The gist of the embodiment of the present invention includes at least the following.

  (1) This is a power supply facility that supplies power to a load, and includes a DC bus having a capacity of a capacitor, a constant voltage power supply device that supplies power to the DC bus via a diode, and a voltage of the DC bus Alternatively, when the constant voltage power supply is charged based on the output voltage of the constant voltage power supply and a power failure occurs, a backup storage battery that discharges to supply power to the DC bus, and the voltage of the DC bus And a cycle storage battery that executes a cycle of charging and discharging for supplying power to the DC bus more routinely than the backup storage battery, and interposed between the DC bus and the cycle storage battery The bidirectional converter, the voltage of the DC bus and a threshold value are compared, and the converter is charged or discharged with the cycle storage battery. Value by changing the charge and discharge conditions by variably setting the and discharge of the cycle storage battery is provided with a control unit that to be preferentially performed than the discharge of the backup battery.

  In the power supply equipment configured as described above, the charge / discharge conditions can be changed by variably setting the threshold for the cycle storage battery. Therefore, for example, the mode for discharging the cycle storage battery for the purpose of peak shift or the setting of the mode for charging can be easily realized by using a common converter. In addition, by appropriately setting the threshold value, it is possible to preferentially discharge the cycle storage battery over the backup storage battery. Therefore, it is possible to utilize the cycle storage battery as much as possible, and reduce the turn of the backup storage battery. Thereby, for example, if it is a backup storage battery using a lead storage battery, its useful life can be extended.

(2) Further, in the power supply facility according to (1), when the conversion device is the first conversion device, a bidirectional second conversion device interposed between the DC bus and the backup storage battery is provided. The control unit starts charging the storage battery for the cycle when the voltage of the DC bus becomes equal to or higher than the charging start voltage V _C1, and the cycle when the voltage of the DC bus becomes equal to or lower than the discharging start voltage V _D1. Controlling the first converter to start discharging from the storage battery,
The control unit starts charging the backup storage battery when the voltage of the DC bus becomes equal to or higher than the charge start voltage V _C2 , and starts the backup when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D2 . Controlling the second converter to start discharging from the storage battery;
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
The control unit may selectively execute the discharge mode that satisfies the above relationship.

In this case, the charging mode, if there is a constant voltage V _F of the constant voltage power supply, a backup storage battery, the cycle storage battery are both being charged. If the voltage of the DC bus can not be maintained constant voltage V _F of the constant voltage power supply is lowered, the discharge cycle for the battery is performed preferentially. In discharge mode, even if there is a constant voltage V _F of the constant-voltage power supply device, since the constant voltage V _F is lower than the discharge starting voltage V _D1, discharge cycle storage battery is performed. Further, even if the voltage of the DC bus can not be maintained constant voltage V _F of the constant voltage power supply is reduced, the discharge cycle for the battery is performed preferentially.

(3) The power supply facility of (1) further includes a switch device interposed between the DC bus and the backup storage battery, and the control unit is configured such that the voltage of the DC bus is equal to or higher than a charging start voltage V _C1 . The charging of the cycle storage battery is started, and the converter is controlled to start discharging from the cycle storage battery when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D1. The unit starts charging the backup storage battery when the voltage of the DC bus becomes equal to or higher than the charging start voltage V _C2 , and starts charging from the backup storage battery when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D2. Controlling the switch device to start discharging,
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
The control unit may selectively execute the discharge mode that satisfies the above relationship.

In this case, the charging mode, if there is a constant voltage V _F of the constant voltage power supply, a backup storage battery, the cycle storage battery are both being charged. If the voltage of the DC bus can not be maintained constant voltage V _F of the constant voltage power supply is lowered, the discharge cycle for the battery is performed preferentially. In discharge mode, even if there is a constant voltage V _F of the constant-voltage power supply device, since the constant voltage V _F is lower than the discharge starting voltage V _D, the discharge cycle for the battery is made. Further, even if the voltage of the DC bus can not be maintained constant voltage V _F of the constant voltage power supply is reduced, the discharge cycle for the battery is performed preferentially. For example, a relay can be used as the switch device, and the configuration is simpler and less expensive than the use of the conversion device.

(4) Further, in the power supply facility of (1), the constant voltage power supply device has a configuration in which the diode is connected to an output side of an AC / DC converter, and a connection point between the converter and the diode. The backup storage battery may be directly connected.
In this case, the backup storage battery is constantly charged at a constant voltage (float charge) by the constant voltage power supply device. For example, a backup storage battery using a lead storage battery can be said to be an effective connection place in order to prolong its useful life.

(5) In addition, in the power supply facility according to (4), when a power failure of the constant voltage power supply device is detected, charging of the cycle storage battery to the conversion device of the cycle storage battery is prohibited. Also good.
In this case, it is possible to prevent a charging current from flowing from the backup storage battery to the cycle storage battery when the constant voltage power supply device fails.

(6) Further, in the power supply facility of (2), when the second conversion device charges the backup storage battery, the second conversion device performs constant current charging and detects that the battery is fully charged. Charging can be performed.
In this case, the backup storage battery after full charge is charged at a constant voltage (float charge). Thereby, for example, if it is a backup storage battery using a lead storage battery, its useful life can be extended.

(7) Moreover, in any one of the power feeding facilities according to (1) to (6), a power generation device using natural energy may be connected to the DC bus separately from the constant voltage power supply device.
A power generation device using natural energy does not stabilize the amount of power generation, but by using it together with a cycle storage battery, stable power supply to a load is possible.

(8) Further, in the power supply facility of (2) or (3), the control unit executes the charging mode when the remaining amount of the cycle storage battery is equal to or lower than a predetermined lower limit value, and the remaining amount is predetermined. When the upper limit value is exceeded, the discharge mode may be executed.
In this case, the cycle storage battery can be utilized by being charged or discharged according to the remaining amount.

(9) Moreover, in the power supply equipment of (2) or (3), the control unit may select and execute the discharge mode according to time.
In this case, if power is actively supplied from the cycle storage battery during a time zone or day of the week when there is a lot of power demand, the peak shift can be easily realized.

  (10) On the other hand, as a method, power is supplied to a load from a DC bus having a capacity of a capacitor and power is supplied to the DC bus via a diode, and the voltage of the DC bus or the constant voltage Charging based on the output voltage of the voltage power supply, and when the constant voltage power supply fails, charging a backup storage battery for discharging to provide power to the DC bus, charging by the voltage of the DC bus, And a cycle storage battery that performs a cycle of discharging for supplying power to the DC bus more routinely than the backup storage battery, and a bidirectional intervening between the DC bus and the cycle storage battery. A method for operating a power supply facility comprising: a converter for charging the cycle storage battery in the converter by comparing the voltage of the DC bus with a threshold value. Causes the discharge, changes the charge / discharge conditions by variably setting the threshold value, and discharges the cycle storage battery more preferentially than the backup storage battery. It is the operation method of equipment.

  In such an operation method of the power supply facility, the charge / discharge conditions can be changed by variably setting the threshold value for the cycle storage battery. Therefore, for example, the mode for discharging the cycle storage battery for the purpose of peak shift or the setting of the mode for charging can be easily realized by using a common converter. In addition, by appropriately setting the threshold value, it is possible to preferentially discharge the cycle storage battery over the backup storage battery. Therefore, it is possible to utilize the cycle storage battery as much as possible, and reduce the turn of the backup storage battery. Thereby, for example, if it is a backup storage battery using a lead storage battery, its useful life can be extended.

(11) Similarly to the case of (2), in the operation method of the power supply facility of (10), when the conversion device is the first conversion device, the conversion device is interposed between the DC bus and the backup storage battery. to a second converter bidirectional, before Symbol DC bus voltage begins to charge the cycle storage battery when it becomes more than the charge start voltage V _C1, the DC starting voltage buses discharge voltage V _D1 controls the first converter to start discharging from the cycle storage battery when it becomes less, and the backup battery when the voltage of the previous SL DC bus is more than the charge start voltage V _C2 Starting charging, controlling the second conversion device to start discharging from the backup storage battery when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D2 ,
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
Discharge mode in which a relationship may be executed in selection択的a.

(12) In addition, (3) as in the case, in the operation method of the power supply equipment (10), a switch device interposed between the DC bus and the backup battery, before Symbol DC bus voltage The conversion device starts charging of the cycle storage battery when the voltage becomes equal to or higher than the charge start voltage V _C1 and starts discharging from the cycle storage battery when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D1. controls, also, the when the voltage of the previous SL DC bus starts to charge the backup battery when it becomes more than the charge start voltage V _C2, a voltage of the DC bus is less than the discharge starting voltage V _D2 Controlling the switch device to start discharging from the backup storage battery,
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
Discharge mode in which a relationship may be executed in selection択的a.

(13) Further, similarly to the case of (7), in (10), a power generation device using natural energy may be connected to the DC bus separately from the constant voltage power supply device.
(14) In addition, as in the case of (8), (11) or (12), before Symbol remaining cycle for battery executes the charging mode and equal to or less than a predetermined lower limit value, is the remaining The discharge mode may be executed when a predetermined upper limit value is exceeded.
(15) In addition, as in the case of (9), (11) or (12), depending on the time, may be selected and executed before Symbol discharge mode.

[Details of the embodiment]
Hereinafter, the details of the embodiment will be described with reference to the drawings.

<< First Embodiment >>
FIG. 1 is a connection diagram illustrating a power supply facility 100 according to the first embodiment. In the figure, a converter 2 that receives power from a commercial power source PS can generate a constant voltage V _F and can supply power to the DC bus 4 via a diode 3. The diode 3 can also be incorporated in the conversion device 2. The converter 2 performs AC / DC rectification. Commercial power source PS, converter 2 and the diode 3 constitute a constant-voltage power supply apparatus 1 for providing a constant voltage V _F to the DC bus 4. A DC load 5 is connected to the DC bus 4 and receives power supply from the DC bus 4. In addition, although this example is the DC load 5, in the case of an AC load, electric power is supplied from the DC bus 4 to the AC load via an inverter (not shown).

  A bidirectional converter (DC / DC converter) 7 is provided between the DC bus 4 and the cycle storage battery 6. Further, a bidirectional converter (DC / DC converter) 9 is provided between the DC bus 4 and the backup storage battery 8. A capacitor 10 is connected to the DC bus 4, whereby the DC bus 4 has a capacitance.

  The cycle storage battery 6 is, for example, a lithium ion battery, and is suitable for repeated charge and discharge. The cycle storage battery 6 performs a cycle of charging by the voltage of the DC bus 4 and discharging for supplying power to the DC bus 4 more routinely than the backup storage battery 8. The backup storage battery 8 is, for example, a lead storage battery. Lead acid batteries are inexpensive and suitable for long-term standby with full charge. The backup storage battery 8 is charged based on the voltage of the DC bus 4, and discharges to provide power to the DC bus 4 when the constant voltage power supply 1 fails.

  FIG. 2 is a circuit diagram of the converter 7 for the cycle storage battery 6 in FIG. Since the same applies to the conversion device 9 for the backup storage battery 8, the conversion device 7 for the cycle storage battery 6 will be described as a representative.

The conversion device 7 includes a conversion unit 71, a voltage sensor 72 that detects a voltage V _B between both terminals of the cycle storage battery 6, a current I _B output from the storage battery 6 to the conversion unit 71, or vice versa. It includes a current sensor 73 for detecting the current _{I B} to be inputted to the storage battery 6, a voltage sensor 74 for detecting the voltage _{V DC} of DC bus 4, and a control unit 70 from. The conversion unit 71 includes a capacitor 711, switching elements 712, 713, a reactor 714, and a capacitor 715 in order from the left side, and are connected as illustrated.

The control unit 70 controls on / off of the switching elements 712 and 713. The detection output information of the voltage sensors 72 and 74 and the current sensor 73 is given to the control unit 70.
When power is sent to the DC bus 4 by discharging the cycle storage battery 6, control as a step-up chopper is performed by PWM control of the switching elements 712 and 713 based on the control of the control unit 70. When charging cycle storage battery 6 based on the voltage _{V DC} of DC bus 4, the PWM control of the switching elements 712 and 713 based on the control of the control unit 70, the control of the step-down chopper is performed. Note that the control unit 70 may be provided outside rather than as part of the conversion device 7.

Hereinafter, although operation | movement of the electric power feeding equipment 100 is demonstrated, this is also description about the operating method of the electric power feeding equipment 100. FIG.
In the operation of the power supply facility 100, in addition to supplying power to the load, “charging mode” mainly for charging the cycle storage battery 6 and the backup storage battery 8, and in addition to supplying power to the load, the cycle storage battery 6 There is a “discharge mode” based on electric discharge.

<Charging mode>
Next, the operation of the power supply facility 100 in the charging mode will be described with reference to FIGS. 1 and 4. First, in FIG. 1, a constant voltage _{V F} which is output from the constant-voltage power supply apparatus 1 is 380V, and to. The converter 7 connected to the cycle storage battery 6 has a charge start voltage V _C1 of 378 V and a discharge start voltage V _D1 of 370 V. Therefore, if the voltage of the DC bus 4 is 378 V or more, the converter 7 charges the cycle storage battery 6, and if the voltage of the DC bus 4 is 370 V or less, the conversion battery 7 is discharged. These threshold voltages V _C1 and V _D1 are set in the control unit 70 (FIG. 2) of the conversion device 7.

On the other hand, the converter 9 connected to the backup storage battery 8 has a charge start voltage V _C2 of 375 V and a discharge start voltage V _D2 of 365 V. Therefore, the converter 9 charges the backup storage battery 8 if the voltage of the DC bus 4 is 375 V or more, and discharges the backup storage battery 8 if the voltage of the DC bus 4 is 365 V or less. These threshold voltages V _C2 and V _D2 are set in the control unit 70 (FIG. 2) of the conversion device 9.

The above voltage values and threshold values are summarized as follows.
V _F = 380V
V _C1 = 378V
V _D1 = 370V
V _C2 = 375V
V _D2 = 365V
The magnitude relationship is V _D2 <V _D1 <V _C2 <V _C1 <V _F (1)
It is. Note that either V _C1 or V _C2 may be larger in terms of control, or may be the same as each other. Therefore, the magnitude relationship between the voltage and the threshold value in the charging mode is expressed by the following two expressions.
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F (1a)
V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F (1b)

FIG. 4 is a graph showing the relationship between the voltage of the DC bus 4 and the charging / discharging of the storage batteries 6 and 8 in the charging mode. In the figure, if the constant-voltage power supply apparatus 1 constant voltage _{V F} is supplied to the DC bus 4, the voltage of the DC bus 4 is the charging start voltage _{V C1, V C2} above, each battery 6 and 8 Both are charged by the voltage of the DC bus 4. As long as the constant voltage V _F is stably supplied to the DC bus 4, this condition persists.

In addition, when the backup storage battery 8 is charged in the conversion device 9 of the backup storage battery 8, first, constant current charging is performed, and when the control unit 70 (FIG. 2) detects that the battery is fully charged, the constant current charging is performed. It is preferable to perform voltage charging. The full charge can be grasped by integrating the charging current and detecting the open circuit voltage (OCV) of the backup storage battery 8.
In this case, the backup storage battery 8 after full charge is charged at a constant voltage (float charge). Thereby, if it is the backup storage battery 8 which uses, for example, a lead storage battery, its useful life can be extended.

Here, the voltage at which the cycle storage battery 6 stops charging during charging or the common voltage at which discharging stops during discharging is referred to as “charging / discharging stopping voltage V _S1 ”, for example, V _S1 = 373 V. Further, a voltage at which the backup storage battery 8 stops charging during charging or a common voltage at which discharging stops during discharging is referred to as “charging / discharging stopping voltage V _S2 ”, for example, V _S2 = 370V.

The abnormality or the like of the constant-voltage power supply device 1, the voltage of the DC bus 4 falls below the constant voltage V _F, becomes the discharge stop voltage V _{S1 (373V),} charging a stopping cycle storage battery 6 by the converter 7 . When the voltage of the DC bus 4 further decreases to the discharge start voltage V _D1 (370 V), the converter 7 starts discharging the cycle storage battery 6. At this time, since the discharge start voltage V _D1 and the charge / discharge stop voltage V _S2 for the backup storage battery 8 are the same (370 V), the converter 9 stops the charging of the backup storage battery 8.

When the cycle storage battery 6 starts to discharge, the voltage of the DC bus 4 rises and reaches the charge / discharge stop voltage V _S1 (373 V). Then, the discharge is stopped. _{When the} voltage drops to _D1 (370V), the cycle storage battery 6 is discharged again. If the constant voltage V _F by the constant-voltage power supply device 1 is recovered, the repetition of this state. While the remaining capacity of the cycle storage battery 6 is sufficient, the voltage of the DC bus 4 is between the discharge start voltage V _D1 (370 V) and the charge / discharge stop voltage V _S1 (373 V) of the cycle storage battery 6 by repeated discharge. Go back and forth.

When the discharge of the cycle storage battery 6 proceeds and the voltage of the DC bus 4 cannot be increased, the voltage of the DC bus 4 drops to the discharge start voltage V _D2 (365 V) of the backup storage battery 8. Here, the converter 9 starts discharging the backup storage battery 8 for the first time. When the backup storage battery 8 starts discharging, when the voltage of the DC bus 4 rises and reaches the charge / discharge stop voltage V _S2 (370 V), the discharge is stopped, but the voltage of the DC bus 4 is changed to the discharge start voltage V by the discharge stop. _{When the} voltage drops to _D2 (365V), the backup storage battery 8 is discharged again. If the constant voltage V _F by the constant-voltage power supply device 1 is recovered, the repetition of this state.

When the constant voltage V _F by the constant-voltage power supply device 1 is restored, the voltage of the DC bus 4 returns becomes V _F, the initial state of FIG. That is, the cycle storage battery 6 and the backup storage battery 8 are both charged. There is no instantaneous power outage due to the power supply change.
Further, as described above, in the charging mode, if there is a constant voltage V _F of the constant-voltage power supply unit 1, a backup storage battery 8, cycle storage battery 6 are both being charged. If the voltage of the DC bus 4 can not be maintained constant voltage V _F of the constant-voltage power supply 1 is lowered, the discharge cycle for the battery 6 is performed preferentially.

<Discharge mode>
Next, the operation of the power supply facility 100 in the discharge mode will be described with reference to FIGS.
FIG. 3 is a connection diagram illustrating the power supply facility 100 according to the first embodiment, in which threshold values for charging and discharging in the discharge mode are described. 3, the constant voltage _{V F} which is output from the constant-voltage power supply apparatus 1 is 380V. Moreover, the converter 9 connected to the backup storage battery 8 has a charge start voltage V _C2 of 375 V and a discharge start voltage V _D2 of 365 V. Therefore, the converter 9 charges the backup storage battery 8 if the voltage of the DC bus 4 is 375 V or more, and discharges the backup storage battery 8 if the voltage of the DC bus 4 is 365 V or less. Up to this point, the charging mode is the same.

On the other hand, the converter 7 connected to the cycle storage battery 6 has a charge start voltage V _C1 of 390 V and a discharge start voltage V _D1 of 385 V. Therefore, if the voltage of the DC bus 4 is 390 V or higher, the converter 7 charges the cycle storage battery 6, and discharges the cycle storage battery 6 if the voltage of the DC bus 4 is 385 V or less. As is clear from comparison with FIG. 1, the charge / discharge threshold in the converter 7 is higher than that in the charge mode. Accordingly, even when the constant voltage V _F by the constant-voltage power supply device 1, it is possible to discharge the cycle storage battery 6.

The voltage values and threshold values in the discharge mode are summarized as follows.
V _F = 380V
V _C1 = 390V
V _D1 = 385V
V _C2 = 375V
V _D2 = 365V
The magnitude relationship is V _D2 <V _C2 <V _F <V _D1 <V _C1 (2)
It is.

FIG. 5 is a graph showing the relationship between the voltage of the DC bus 4 and the charge / discharge of each of the storage batteries 6 and 8 in the discharge mode.
Here, the voltage at which the cycle storage battery 6 stops charging during charging or the common voltage at which discharging stops during discharging is referred to as “charging / discharging stopping voltage V _S1 ”, for example, V _S1 = 390 V. Further, a voltage at which the backup storage battery 8 stops charging during charging or a common voltage at which discharging stops during discharging is referred to as “charging / discharging stopping voltage V _S2 ”, for example, V _S2 = 370V.

5, even when the constant-voltage power supply apparatus 1 constant voltage _{V F} is supplied to the DC bus 4, the voltage of the DC bus 4 (380V) is less than 385V. Therefore, the converter 7 discharges the cycle storage battery 6. Up voltage of the DC bus 4 by the constant voltage V _F by the discharge, at a charge and discharge stop voltage V _{S1 (390} V), the discharge cycle for the battery 6 by the converter 7 will be stopped.

When the voltage of the DC bus 4 drops to the discharge start voltage V _D1 (385 V) due to the stop of discharge, the cycle storage battery 6 is discharged again. As long as there is a sufficient remaining amount in the cycle storage battery 6, such discharge is repeated, and power is supplied from the cycle storage battery 6 to the DC load 5. During this time, since the voltage of the DC bus 4 is maintained at 385 to 390 V, power cannot be sent from the constant voltage power supply device 1 to the DC bus 4. In this way, the electric power stored in the cycle storage battery 6 can be used without using the constant voltage power supply device 1 (commercial power supply). For example, the power stored in the cycle storage battery 6 can be used during the day when the electricity price is low, or the power stored in the cycle storage battery 6 can be used by suppressing the purchase of power from a commercial power source during peak hours when power supply and demand is tight. Peak shift can be performed.

Thereafter, the cycle storage battery 6 level is low and the discharge, it is not possible to maintain a high level voltage, the constant voltage V _F from the constant-voltage power supply device 1 returns to the state to be supplied to the DC bus 4 .

Further, when also the constant-voltage power supply device 1 can not be maintained constant voltage V _F by abnormalities such as a power failure, the voltage of the DC bus 4 falls to the discharge starting voltage V _D2 of the backup battery 8 _(365V). Here, the converter 9 starts discharging the backup storage battery 8 for the first time. When the backup storage battery 8 starts discharging, when the voltage of the DC bus 4 rises and reaches the charge / discharge stop voltage V _S2 (370 V), the discharge is stopped, but the voltage of the DC bus 4 is changed to the discharge start voltage V by the discharge stop. _{When the} voltage drops to _D2 (365V), the backup storage battery 8 is discharged again. If the constant voltage V _F by the constant-voltage power supply device 1 is recovered, the repetition of this state.

When the constant voltage V _F by the constant-voltage power supply device 1 is restored, the voltage of the DC bus 4 becomes V _F. At this time, no instantaneous power failure occurs due to the change of power supply. Thereafter, the control returns to the charging mode of FIG. 4, and both the cycle storage battery 6 and the backup storage battery 8 are charged by the voltage of the DC bus 4.

As described above, in the discharge mode, even if there is a constant voltage V _F of the constant-voltage power supply device 1, since the constant voltage V _F is lower than the discharge starting voltage V _D1, discharge cycle storage battery 6 is performed. Further, the voltage of the DC bus 4 can not be maintained constant voltage V _F of the constant-voltage power supply device 1 is sometimes decreased, discharge cycle storage battery 6 is performed preferentially.

<Summary>
Regarding the control of the charge mode / discharge mode, the control unit 70 (FIG. 2) compares the voltage of the DC bus 4 with the threshold value and causes the converter 7 to charge or discharge the cycle storage battery 6. The charging / discharging conditions are changed by variably setting and the discharging of the cycle storage battery 6 is preferentially performed over the discharging of the backup storage battery 8.

  That is, in the power supply facility 100 configured as described above, with respect to the cycle storage battery 6, as shown in FIGS. 1 and 3, the charging / discharging conditions can be changed by variably setting the threshold value. Therefore, for example, setting of the mode for discharging the cycle storage battery 6 for the purpose of peak shift (FIGS. 3 and 5) and conversely the mode for charging (FIGS. 1 and 4) is performed using the common converter 7. It can be easily realized. In addition, by appropriately setting the threshold value, the cycle storage battery 6 can be discharged more preferentially than the backup storage battery 8. Therefore, it is possible to utilize the cycle storage battery 6 as much as possible and reduce the turn of the backup storage battery 8. Thereby, if it is the backup storage battery 8 which uses, for example, a lead storage battery, its useful life can be extended.

In addition, the control part 70 of the converter 7 will perform charge mode, if the residual amount (SOC: State of Charge) of the cycle storage battery 6 becomes below a predetermined | prescribed lower limit value, and if the said residual amount becomes more than a predetermined | prescribed upper limit value. The discharge mode may be executed.
Thereby, the storage battery 6 for cycles can be utilized by charging or discharging according to the remaining amount.

  As described above, the power supply facility 100 as described above can cope with the peak shift by changing the mode. For example, in the case of a consumer whose daily power consumption changes as shown in FIG. 6, the target power for saving is set according to the time zone or day of the week when the power demand is expected to increase. If the power of the cycle storage battery 6 is positively utilized during the time period exceeding the target power, and the power lost by the cycle storage battery 6 is charged using, for example, night power, it is easy to peak shift. It can correspond to.

<< Second Embodiment >>
FIG. 7 is a connection diagram illustrating the power supply facility 100 according to the second embodiment. The difference from FIG. 1 and FIG. 3 is that the output of the photovoltaic power generation panel 11 is connected to the DC bus 4 via the conversion device 12, and the others are the same as in the first embodiment. The converter 12 performs MPPT (Maximum Power Point Tracking) control on the photovoltaic power generation panel 11. In addition to solar power generation, a power generation device using natural energy such as wind power generation can be connected.

Although the power generation amount using natural energy is not stable, the combined use with the cycle storage battery 6 enables stable power supply to the load.
Moreover, the storage battery 6 for a cycle and the storage battery 8 for a backup can be charged using the electric power of solar power generation.

<< Third Embodiment >>
FIG. 8 is a connection diagram illustrating the power supply facility 100 according to the third embodiment. The difference from FIG. 7 is that the conversion device 9 is simply replaced by a switch device (for example, a relay) 9R. This is a simple and inexpensive configuration as compared with the case of using a converter (DC / DC converter). The switch device 9R can be controlled by a command from the control unit 70 of the conversion device 7, for example. A semiconductor switch can also be used as the switch device 9R.

<Charging mode>
FIG. 9 is a graph showing the relationship between the voltage of the DC bus 4 and the charging / discharging of the storage batteries 6 and 8 in the charging mode of the power supply facility 100 of FIG. Similar to FIG. 4 charged and the constant voltage V _F from the constant-voltage power supply apparatus 1 is supplied to the DC bus 4, because it is the charging start voltage V _C1 above, the cycle storage battery 6 by the voltage of the DC bus 4 Has been. In this case, the contact of the switch device 9R is closed, and the backup storage battery 8 is charged by the voltage of the DC bus 4. As long as the constant voltage V _F is stably supplied to the DC bus 4, this condition persists.

(Cycle battery)
The abnormality or the like of the constant-voltage power supply device 1, the voltage of the DC bus 4 falls below the constant voltage V _F, becomes the discharge stop voltage V _{S1 (373V),} charging a stopping cycle storage battery 6 by the converter 7 . When the voltage of the DC bus 4 further decreases to the discharge start voltage V _D1 (370 V), the converter 7 starts discharging the cycle storage battery 6.

When the cycle storage battery 6 starts to discharge, the voltage of the DC bus 4 rises and reaches the charge / discharge stop voltage V _S1 (373 V). Then, the discharge is stopped. _{When the} voltage drops to _D1 (370V), the cycle storage battery 6 is discharged again. If the constant voltage V _F by the constant-voltage power supply device 1 is recovered, the repetition of this state. While the remaining capacity of the cycle storage battery 6 is sufficient, the voltage of the DC bus 4 is between the discharge start voltage V _D1 (370 V) and the charge / discharge stop voltage V _S1 (373 V) of the cycle storage battery 6 by repeated discharge. Go back and forth.

(Backup battery)
On the other hand, when the voltage of the DC bus 4 is higher than the nominal voltage V _S2 of the backup storage battery 8, the switch device 9R is turned on or off according to the remaining amount of the backup storage battery 8. For example, when the remaining amount falls below 95% or becomes lower than a voltage corresponding to 95% (open voltage), the switch device 9R is turned on (closed) by a command from the conversion device 7. Thereby, the backup storage battery 8 is charged by the voltage of the DC bus 4.

Further, when the discharge of the cycle storage battery 6 proceeds and the voltage of the DC bus 4 cannot be raised, the voltage of the DC bus 4 becomes equal to or lower than the nominal voltage V _S2 of the backup storage battery 8. Accordingly, the switch device 9R is turned off.
Furthermore, the voltage of the DC bus 4 is lowered to the discharge start voltage V _D2 (365 V) of the backup storage battery 8. Here, the switch device 9R is closed by an instruction from the conversion device 7, and the backup storage battery 8 starts discharging. As a result, power is supplied from the backup storage battery 8 to the DC load 5. However, since the voltage cannot be boosted, the voltage of the DC bus 4 does not increase.

When the constant voltage V _F by the constant-voltage power supply device 1 is restored, the voltage of the DC bus 4 returns becomes V _F, the initial state of FIG. That is, the cycle storage battery 6 and the backup storage battery 8 are both charged. There is no instantaneous power outage due to the change of power supply.
Further, as described above, in the charging mode, if there is a constant voltage V _F of the constant-voltage power supply unit 1, a backup storage battery 8, cycle storage battery 6 are both being charged. If the voltage of the DC bus 4 can not be maintained constant voltage V _F of the constant-voltage power supply 1 is lowered, the discharge cycle for the battery 6 is performed preferentially.

<Discharge mode>
FIG. 10 is a graph showing a relationship between the voltage of the DC bus 4 in the charging mode of the power supply facility 100 of FIG.
10, even when the constant-voltage power supply apparatus 1 constant voltage _{V F} is supplied to the DC bus 4, the voltage of the DC bus 4 (380V) is less than 385V. Therefore, the converter 7 discharges the cycle storage battery 6. Up voltage of the DC bus 4 by the constant voltage V _F by the discharge, at a charge and discharge stop voltage V _{S1 (390} V), the discharge cycle for the battery 6 by the converter 7 will be stopped.

When the voltage of the DC bus 4 drops to the discharge start voltage V _D1 (385 V) due to the stop of discharge, the cycle storage battery 6 is discharged again. As long as there is a sufficient remaining amount in the cycle storage battery 6, such discharge is repeated, and power is supplied from the cycle storage battery 6 to the DC load 5. During this time, since the voltage of the DC bus 4 is maintained at 385 to 390 V, power cannot be sent from the constant voltage power supply device 1 to the DC bus 4. In this way, the electric power stored in the cycle storage battery 6 can be used without using the constant voltage power supply device 1 (commercial power supply). For example, the power stored in the cycle storage battery 6 can be used during the day when the electricity price is low, or the power stored in the cycle storage battery 6 can be used by suppressing the purchase of power from a commercial power source during peak hours when power supply and demand is tight. Peak shift can be performed.

Thereafter, the cycle storage battery 6 level is low and the discharge, it is not possible to maintain a high level voltage, the constant voltage V _F from the constant-voltage power supply device 1 returns to the state to be supplied to the DC bus 4 .

On the other hand, when the voltage of the DC bus 4 is higher than the nominal voltage V _S2 of the backup storage battery 8, the switch device 9R is turned on or off according to the remaining amount of the backup storage battery 8. For example, when the remaining amount falls below 95% or becomes lower than a voltage corresponding to 95% (open voltage), the switch device 9R is turned on (closed) by a command from the conversion device 7. Thereby, the backup storage battery 8 is charged by the voltage of the DC bus 4.

Also, the discharge process progresses cycle storage battery 6, it becomes impossible to raise the voltage of the DC bus 4, further, when a state that is not supplied by the constant voltage V _F blackout, DC voltage of the bus 4 is the discharge of the backup battery 8 The voltage drops to the start voltage V _D2 (365V). Here, the switch device 9R is closed by an instruction from the conversion device 7, and the backup storage battery 8 starts discharging. As a result, power is supplied from the backup storage battery 8 to the DC load 5. However, since the voltage cannot be boosted, the voltage of the DC bus 4 does not increase.

When the constant voltage V _F by the constant-voltage power supply device 1 is restored, the voltage of the DC bus 4 becomes V _F. At this time, no instantaneous power failure occurs due to the change of power supply. Thereafter, the charging mode of FIG. 9 is returned to and the cycle storage battery 6 and the backup storage battery 8 are both charged.

As described above, in the discharge mode, even if there is a constant voltage V _F of the constant-voltage power supply device 1, since the constant voltage V _F is lower than the discharge starting voltage V _D1, discharge cycle storage battery 6 is performed. Further, the cycle storage battery 6 is preferentially discharged compared to the backup storage battery 8.

<Summary>
Also in the case of the third embodiment, the cycle storage battery 6 operates in the same manner as the first embodiment by the conversion device 7, and exhibits the same effects. The same applies to the point that the cycle storage battery 6 is preferentially used over the backup storage battery 8.
On the other hand, since the charging / discharging of the backup storage battery 8 can be performed by the switch device 9R, the configuration is simpler and less expensive than using the conversion device.

<< 4th Embodiment >>
FIG. 11 is a connection diagram illustrating a power supply facility 100 according to the fourth embodiment. The difference from FIG. 8 is that the backup storage battery 8 is directly connected to the connection point between the AC / DC converter 2 and the diode 3. Also in this case, the cycle storage battery 6 operates in the same manner as in the first embodiment by the conversion device 7, and exhibits the same effects. In the configuration of FIG. 8, when the switch device 9R is off (open), the backup storage battery 8 is not in a constant voltage charge (float charge) state. However, in the case of a lead-acid battery, it is possible to extend the useful life by always maintaining a constant voltage charge (float charge).

  In this regard, the configuration of FIG. 11 can keep the backup storage battery 8 in a constant voltage charge (float charge) state as long as the commercial power source PS does not fail. Thereby, when the backup storage battery 8 is a lead storage battery, its useful life can be extended.

However, the following problem arises because the backup storage battery 8 is connected to this position.
FIG. 12 is a connection diagram that considers the case where the commercial power supply PS has failed and no photovoltaic power generation is performed (nighttime) in the power supply facility 100 of FIG. 11. In the figure, the non-functional part is indicated by a dotted line. In this case, the backup storage battery 8 supplies power to the DC load 5 and charges the cycle storage battery 6 from the DC bus 4 via the converter 7.

  FIG. 13 is a connection diagram illustrating a state in which the backup storage battery 8 is discharged from the state of FIG. 12 and there is no remaining amount to supply power to the DC load 5. In the figure, the non-functional part is indicated by a dotted line. In this case, electric power is supplied from the cycle storage battery 6 to the DC load 5 via the converter 7.

  Charging / discharging as shown in FIGS. 12 and 13 is contrary to the concept of the above-described embodiment in which the discharge of the cycle storage battery 6 is prioritized. When the backup storage battery 8 which is a lead storage battery is completely discharged, the deterioration becomes significant. Moreover, once the cycle storage battery 6 is charged from the backup storage battery 8 and then the cycle storage battery 6 is discharged, the loss of electric power becomes large and wasteful.

  Therefore, in the power supply facility 100 of FIG. 11, a control signal is sent from the conversion device 2 that detects a power failure of the commercial power source PS to the conversion device 7 of the cycle storage battery 6 to prohibit the cycle storage battery 6 from being charged. Thereby, it can avoid that the storage battery for cycles is charged by the discharge of the backup storage battery 8.

Further, in FIG. 11, the voltage of the backup battery 8 fully charged is the same as the constant voltage V _F. In discharge mode, even when the constant voltage V _F, the cycle storage battery 6 so discharged, are used preferentially over the backup battery 8. In addition, if the voltage of the charged cycle storage battery 6 is discharged at a level higher than the constant voltage V _F , the cycle storage battery is first discharged even when the commercial power supply PS is interrupted. The storage battery can be discharged.

<Others>
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Constant voltage power supply device 2 Converter 3 Diode 4 DC bus 5 DC load 6 Cycle storage battery 7 Converter 8 Backup storage battery 9 Converter 9R Switch device 10 Capacitor 11 Solar power generation panel 12 Converter 70 Controller 71 Converter 72 Voltage sensor 73 Current sensor 74 Voltage sensor 100 Power supply equipment 711 Capacitor 712, 713 Switching element 714 Reactor 715 Capacitor PS Commercial power supply

Claims (13)

A power supply facility for supplying power to a load,
A DC bus with a capacitor capacity;
A constant voltage power supply that provides power to the DC bus via a diode;
A backup storage battery that is charged based on the voltage of the DC bus or the output voltage of the constant voltage power supply, and discharges to provide power to the DC bus when the constant voltage power supply fails.
A cycle storage battery that performs a cycle of charging by the voltage of the DC bus and discharging for providing power to the DC bus more routinely than the backup storage battery;
A bidirectional first converter interposed between the DC bus and the cycle storage battery;
A bi-directional second converter interposed between the DC bus and the backup storage battery;
Comparing the voltage of the DC bus with a threshold value and causing the first converter to charge or discharge the cycle storage battery, changing the threshold value variably, changing the charge / discharge conditions, and A control unit that causes the discharge of the cycle storage battery to be preferentially performed over the discharge of the backup storage battery , and
The controller starts charging the storage battery for the cycle when the voltage of the DC bus becomes equal to or higher than the charging start voltage V _C1, and for the cycle when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D1 . Controlling the first converter to start discharging from the storage battery, and
The control unit starts charging the backup storage battery when the voltage of the DC bus becomes equal to or higher than the charge start voltage V _C2 , and starts the backup when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D2 . Controlling the second converter to start discharging from the storage battery;
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
The power supply equipment in which the control unit selectively executes a discharge mode that satisfies the following relationship . A power supply facility for supplying power to a load,
A DC bus with a capacitor capacity;
A constant voltage power supply that provides power to the DC bus via a diode;
A backup storage battery that is charged based on the voltage of the DC bus or the output voltage of the constant voltage power supply, and discharges to provide power to the DC bus when the constant voltage power supply fails.
A cycle storage battery that performs a cycle of charging by the voltage of the DC bus and discharging for providing power to the DC bus more routinely than the backup storage battery;
A bidirectional conversion device interposed between the DC bus and the cycle storage battery;
A switching device interposed between the DC bus and the backup storage battery;
Comparing the voltage of the DC bus with a threshold value and allowing the converter to charge or discharge the cycle storage battery, changing the threshold value variably to change the charge / discharge conditions, and for the cycle A control unit that causes discharge of the storage battery to be performed preferentially over discharge of the backup storage battery, and
The controller starts charging the storage battery for the cycle when the voltage of the DC bus becomes equal to or higher than the charging start voltage V _C1, and for the cycle when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D1 . to control the previous Symbol conversion device to start the discharge from the storage battery, also,
The control unit starts charging the backup storage battery when the voltage of the DC bus becomes equal to or higher than the charge start voltage V _C2 , and starts the backup when the voltage of the DC bus becomes equal to or lower than the discharge start voltage V _D2 . Controlling the switch device to start discharging from the storage battery,
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
Of the discharge mode in which a relationship, the control unit executes selectively feed electric equipment. A power supply facility for supplying power to a load,
A DC bus with a capacitor capacity;
A constant voltage power supply that provides power to the DC bus via a diode;
A backup storage battery that is charged based on the voltage of the DC bus or the output voltage of the constant voltage power supply, and discharges to provide power to the DC bus when the constant voltage power supply fails.
A cycle storage battery that performs a cycle of charging by the voltage of the DC bus and discharging for providing power to the DC bus more routinely than the backup storage battery;
A bidirectional conversion device interposed between the DC bus and the cycle storage battery;
Comparing the voltage of the DC bus with a threshold value and allowing the converter to charge or discharge the cycle storage battery, changing the threshold value variably to change the charge / discharge conditions, and for the cycle A control unit that causes discharge of the storage battery to be performed preferentially over discharge of the backup storage battery, and
The constant voltage power supply device is configured such that the diode is connected to the output side of the AC / DC converter, and the backup storage battery is directly connected to the connection point between the AC / DC converter and the diode. the power supply facility that is. The power supply facility according to claim 3, wherein, when a power failure of the constant voltage power supply device is detected, charging of the cycle storage battery is prohibited with respect to the conversion device of the cycle storage battery . 2. The power supply facility according to claim 1 , wherein the second conversion device performs constant current charging when charging the backup storage battery, and performs constant voltage charging when detecting that the battery is fully charged . The power supply facility according to any one of claims 1 to 5, wherein a power generation device using natural energy is connected to the DC bus separately from the constant voltage power supply device . The said control part performs the said charge mode, when the residual amount of the said storage battery for cycles becomes below a predetermined | prescribed lower limit, and performs the said discharge mode when the said residual amount becomes more than a predetermined | prescribed upper limit. 2. The power supply facility according to 2 . The power supply facility according to claim 1 or 2 , wherein the control unit selects and executes the discharge mode according to time . A constant voltage power supply device that supplies power to a load from a DC bus having a capacity of a capacitor and supplies the power to the DC bus via a diode, and a voltage of the DC bus or an output voltage of the constant voltage power supply device When the power supply is charged and the constant voltage power supply fails, a backup storage battery that discharges to supply power to the DC bus, charging by the voltage of the DC bus, and supplying power to the DC bus A cycle storage battery that performs a cycle of discharge to perform more routinely than the backup storage battery, and a bidirectional first converter that is interposed between the DC bus and the cycle storage battery, For a power supply facility comprising a bidirectional second conversion device interposed between the DC bus and the backup storage battery, the voltage and threshold value of the DC bus In comparison, the first converter is charged or discharged with the cycle storage battery, the charge / discharge condition is changed by variably setting the threshold value, and the discharge of the cycle storage battery is the backup. It is a method of operating the power supply equipment so that it is performed preferentially over the discharge of the storage battery,
When the DC bus voltage becomes equal to or higher than the charging start voltage V _C1 , the charging of the cycle storage battery is started, and when the DC bus voltage becomes equal to or lower than the discharge start voltage V _D1, discharge starts from the cycle storage battery. Controlling the first converter to do so, and
When the DC bus voltage becomes equal to or higher than the charging start voltage V _C2 , the charging of the backup storage battery is started, and when the DC bus voltage becomes equal to or lower than the discharging start voltage V _D2, discharge starts from the backup storage battery. Controlling the second conversion device to
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
The operation method of the power supply equipment that selectively executes the discharge mode that is A constant voltage power supply device that supplies power to a load from a DC bus having a capacity of a capacitor and supplies the power to the DC bus via a diode, and a voltage of the DC bus or an output voltage of the constant voltage power supply device When the power supply is charged and the constant voltage power supply fails, a backup storage battery that discharges to supply power to the DC bus, charging by the voltage of the DC bus, and supplying power to the DC bus A cycle storage battery that performs a cycle of discharge to be performed more routinely than the backup storage battery, a bidirectional conversion device interposed between the DC bus and the cycle storage battery, and the DC bus wherein a switch device interposed between the backup battery for power feeding apparatus provided with the conversion by comparing the voltage with a threshold value of the DC bus and To charge or discharge the cycle storage battery, and to change the charging / discharging conditions by variably setting the threshold value, and the discharge of the cycle storage battery has priority over the discharge of the backup storage battery. A method of operating the power supply equipment ,
When the DC bus voltage becomes equal to or higher than the charging start voltage V _C1 , the charging of the cycle storage battery is started, and when the DC bus voltage becomes equal to or lower than the discharge start voltage V _D1, discharge starts from the cycle storage battery. Controlling the conversion device to
When the DC bus voltage becomes equal to or higher than the charging start voltage V _C2 , the charging of the backup storage battery is started, and when the DC bus voltage becomes equal to or lower than the discharging start voltage V _D2, discharge starts from the backup storage battery. Controlling the switch device to
Here, the voltage of the constant voltage power supply when the V _F, the relative magnitude relationship,
V _D2 <V _D1 <V _C2 ≦ V _C1 <V _F , or V _D2 <V _D1 <V _C1 ≦ V _C2 <V _F
The charging mode, and
V _D2 <V _C2 <V _F <V _D1 <V _C1
The operation method of the power supply equipment that selectively executes the discharge mode that is The power supply facility operating method according to claim 9 or 10 , wherein a power generation device using natural energy is connected to the DC bus separately from the constant voltage power supply device . The power supply according to claim 9 or 10, wherein the charge mode is executed when a remaining amount of the cycle storage battery is equal to or lower than a predetermined lower limit value, and the discharge mode is executed when the remaining amount is equal to or higher than a predetermined upper limit value. How to operate the equipment. The operation method of the power feeding equipment according to claim 9 or 10 , wherein the discharge mode is selected and executed according to time .

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