JP3560835B2 - Power supply - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power supply device having an energy storage unit.
[0002]
[Prior art]
There is a power supply device that converts electric power of a commercial AC power supply to DC power while supplying it to a load, stores the DC power in an energy storage unit, converts the stored power to AC power as needed, and supplies the AC power to the load. For example, even when the commercial AC power supply fails, the operation of the load can be continued by using the stored power of the energy storage unit.
[0003]
The energy storage unit includes a secondary battery, which stores electric power by charging and supplies electric power to a load by discharging. A converter is provided to perform the charging / discharging and the AC-DC power conversion.
[0004]
[Problems to be solved by the invention]
In charging the energy storage unit, a charging operation according to the specifications of the energy storage unit is required, and a control pattern for performing the charging operation is preset in the conversion unit.
[0005]
Therefore, when the specification of the energy storage unit changes, such as when the secondary battery is changed, parts such as the conversion unit must be replaced with another one. As a result, the entire device may be replaced. There is a problem that such replacement of parts and the entire apparatus causes an increase in cost and an increase in work load.
[0006]
The present invention has been made in consideration of the above circumstances, and an object of the present invention is to enable appropriate operation without changing parts or the entire device even if the specification of the energy storage unit changes, thereby reducing cost. It is an object of the present invention to provide a power supply device having excellent versatility capable of avoiding a rise and an increase in work load.
[0008]
[Means for Solving the Problems]
The power supply device according to the first aspect of the present invention has a power branching line having a power line branching from a commercial AC power supply to a plurality of loads, and a load branching section having a switch in a branch path of the power line, and a power branching unit for storing power. The energy storage unit has a function of converting the power of the commercial AC power supply into DC power and charging the energy storage unit, and a function of discharging the power of the energy storage unit and converting the power into AC power and supplying the AC power to the power line of the load branch unit. A conversion unit, a setting unit for setting operating conditions of the conversion unit and each switch, an interface for connecting an external device, and a conversion unit according to the control command when a control command is input from the interface. And control each switch, and when there is no input of the same control command and when there is an abnormality in the input even if there is an input, the conversion unit and each And a control means for controlling the閉器, the.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0017]
As shown in FIG. 1, a power supply 2 is connected to a commercial AC power supply 1, and a load 3 is connected to the power supply 2.
[0018]
The power supply device 2 includes a load branching unit 10, a conversion unit (charge / discharge unit) 20, and an energy storage unit 30.
[0019]
As shown in FIG. 2, the load branching unit 10 has a power line that branches from the commercial AC power supply 1 to a plurality of loads 3a and 3b, and a contact 11 of a wiring breaker is provided on a non-branch path of the power line. In the branch path of the power line, there are provided contacts 12 and 13 of electromagnetic contactors as switches.
[0020]
The load 3a on the side of the electromagnetic contactor contact 12 is a so-called ordinary load for steady operation equipment. The load 3b on the side of the electromagnetic contactor contact 13 is a so-called fire-fighting load for emergency operation equipment having a structural standard specified by the Fire Service Law.
[0021]
The conversion unit 20 is connected between the energy storage unit 30 and the downstream side of the wiring breaker contact 11 in the power line of the load branching unit 10, converts the power of the commercial AC power supply 1 into DC power, and 30 and a function of discharging the power of the energy storage unit 30 to convert it into AC power and supplying the AC power to the power line of the load branching unit 10, and a wiring breaker contact 11 and an electromagnetic contactor contact 12 , 13 are controlled respectively.
[0022]
FIG. 3 shows a specific configuration of the conversion unit 20.
[0023]
An integrating wattmeter 21, a power converter 22, and a current / voltmeter 23 are connected to a power line connecting the load branching unit 10 and the energy storage unit 30. The integrating wattmeter 21 integrates the amount of AC power (discharge amount) flowing from the power converter 22 to the load branching unit 10. The power conversion device 22 performs charging / discharging of the energy storage unit 30 and AC / DC power conversion according to a command from the microprocessor 26 described later. The current / voltmeter 23 measures a DC current and a DC voltage flowing between the power converter 22 and the energy storage unit 30.
[0024]
The measurement data of the integrating wattmeter 21 is supplied to the microprocessor 26 by the connection circuit 24. The measurement data of the current / voltmeter 23 is supplied to the microprocessor 26 by the connection circuit 25.
[0025]
The microprocessor 26 is provided with a dip switch 27 as an operating condition setting means and functions as a control means for controlling the entire power supply device. The microprocessor 26 is connected to the power conversion device 22 and the TCP / IP interface 28. You. An external device such as a control device 40 is connected to the TCP / IP interface 28.
[0026]
The energy storage unit 30 has a sealed lead storage battery of a cathode absorption type or a valve control type as a secondary battery, and stores DC power.
[0027]
On the other hand, the microprocessor 26 controls the power converter 22, the wiring breaker contact 11, and the electromagnetic contactor contacts 12 and 13 in accordance with the operating conditions set by the dip switch 27. ] To [6].
[0028]
[1] Detection means for detecting the amount of charge (measured by the current / voltmeter) and the amount of discharge (measured by the integrated wattmeter 21) by the power converter 22.
[0029]
[2] Means for executing charging by the power conversion device 22 in a predetermined time zone (for example, nighttime power zone).
[0030]
[3] Means for setting the execution time of charging in a predetermined time zone according to the amount of discharge detected by the detection means.
[0031]
[4] Means for starting discharge by the power conversion device 22 in response to a power failure of the commercial AC power supply 1 or a command input from the outside through the interface 28.
[0032]
[5] Means for detecting the amount of power stored in the energy storage unit 30 from the amount of discharge detected by the detection means during this discharge.
[0033]
[6] Means for selectively closing the electromagnetic contactor contacts 12 and 13 in accordance with the detected amount of stored power.
[0034]
The power supply device 2, as seismic performance, horizontal acceleration 11.76m / ^{s 2,} having a structure to withstand the vertical acceleration 5.88m / ^{s 2.}
[0035]
The energy storage unit 30 is set in a state accommodated in the cubicle 50 as shown in FIG. 4 or installed in an open state as shown in FIG. The cubicle 50 satisfies the structural standards defined by the Fire Service Law.
[0036]
As shown in FIG. 6, the energy storage unit 30 includes a terminal portion 31 for wiring connection, and the terminal portion 31 is connected to a wiring via a conductive plate 60. Alternatively, as shown in FIG. 7, wiring connection is performed by attaching a terminal plate 61 attached to the end of the cable 60 to the terminal portion 31.
[0037]
Next, the operation of the above configuration will be described.
[0038]
Normally, the contacts 11, 12, and 13 of the load branching unit 10 are in a closed state, and the power of the commercial AC power supply 1 is supplied to the general load 3a, the fire-fighting load 3b, and the conversion unit 20. When the converter 20 is not operating (during non-charging and non-discharging), all the power of the commercial AC power supply 1 is supplied to the loads 3a and 3b without power consumption in the converter 20.
[0039]
The microprocessor 26 has a clock function, and when entering the nighttime (midnight) power time zone where the electricity rate is low, the charging operation of the conversion unit 20 is started according to a command from the microprocessor 26. That is, the power of the commercial AC power supply 1 is converted into DC power, and the DC power is charged in the energy storage unit 30.
[0040]
This charging operation is performed for a predetermined time according to the detected discharge amount described later, and only the electric power corresponding to the detected discharge amount is charged.
[0041]
On the other hand, the discharge operation of the conversion unit 20 is started by a command from the microprocessor 26, such as during a peak power time period in which power consumption increases and power supply from the commercial AC power supply 1 alone is not sufficient. That is, the DC power of the energy storage unit 30 is discharged and converted into AC power, and the AC power is supplied to the power line of the load branch unit 10. This compensates for the shortfall due to the increase in power consumption.
[0042]
During this discharge, the amount of discharge is sequentially detected. At the same time, the stored power amount (remaining amount) of the energy storage unit 30 is detected from the detected discharge amount.
[0043]
If the detected amount of stored power exceeds the reference amount, the discharging operation is continued. However, when the stored power amount becomes equal to or less than the reference amount, the discharging operation is stopped.
[0044]
Due to this stop, the power corresponding to the operation of the fire-fighting load 3b is always kept in the energy storage unit 30. Further, if the discharging is continued until all the power is lost, the life of the secondary battery in the energy storage unit 30 may be adversely affected, or the battery may become unusable in some cases. Such a problem can be prevented beforehand.
[0045]
When the commercial AC power supply 1 fails, the power failure is detected in some form, and a command to that effect is input from the control device 40 to the microprocessor 26 via the interface 28. The discharging operation of the converter 20 is started in a form that responds instantaneously to the power failure command.
[0046]
In the discharging operation at the time of the power failure, the electromagnetic contactor contacts 13 on the fire-fighting load 3b side are closed, and the electromagnetic contactor contacts 12 on the general load 3a side are opened. Thus, power supply to the general load 3a is not performed, and only power supply to the fire-fighting load 3b is performed simultaneously with a power failure without interruption.
[0047]
The dip switch 27 can be used to set operating conditions relating to the execution of the charging operation, the execution of the discharging operation, and the reference amount of the stored power. The set operating conditions are stored in a memory in the microprocessor 26.
[0048]
Examples of the set operating conditions include a discharge control pattern shown in FIG. 8 and a charge control pattern shown in FIG. In each case, current, voltage, power, and time are used as parameters.
[0049]
The operating conditions can be set by the control device 40 and input to the microprocessor 26 via the interface 28 in the form of control commands. Based on the input control command, the operation of the converter 20 and the contacts 11, 12, and 13 (energization to the loads 3a and 3b) of the load branching unit 10 are controlled.
[0050]
When a plurality of power supply devices 2 are installed, the control device 40 connects these power supply devices 2 via a LAN line, and sends a control command (collective control command) for parallel operation between devices to each power supply device 2. Can be sent. In each power supply device 2, a control command for inter-device parallel operation issued from the control device 40 is taken into the microprocessor 26 via the interface 28, and each of the conversion unit 20 and the load branching unit 10 is responsive to the control command. The contacts 11, 12, and 13 are controlled.
[0051]
Even if a control command is input from the control device 40, if an abnormality occurs in the input, the conversion unit 20 is controlled based on the operating conditions (set by the DIP switch 27) stored in the memory in the microprocessor 26. And the control of each contact of the load branching unit 10 is continued.
[0052]
As described above, since the operation conditions can be set arbitrarily, even if the specification of the energy storage unit 30 needs to be changed, the appropriate operation can be performed without the need to replace the conversion unit 20 or the entire device. Can be. Therefore, it is possible to avoid an increase in cost and an increase in work load, and the versatility is improved.
[0053]
Moreover, power supply patterns to a plurality of types of loads, that is, the general load 3a and the fire-fighting load 3b, can be appropriately managed while considering their respective characteristics. Therefore, there is no need to provide a dedicated power supply facility for the fire-fighting load 3b. Equipment costs can be reduced.
[0054]
Even if a new load increases, the increase in the load can be dealt with only by adding the branch path of the power line and the contactor contact in the load branching section 10. Therefore, it is not necessary to provide a new power supply facility, and the facility cost can be reduced in this regard.
[0055]
In a situation where a plurality of power supply devices 2 can be prepared, it is of course possible to cope with an increase in load by performing parallel operation of the respective power supply devices 2.
[0056]
Regarding the charging operation, the execution can be specified during the nighttime (midnight) power time zone, etc., so that inexpensive midnight power can be actively used, and the contracted power with the power company must be exceeded and a penalty must be paid. Such troubles can be prevented, and it is economical.
[0057]
Regarding the amount of power stored in the energy storage unit 30, as long as a reference amount necessary for the operation of the fire-fighting load 3b is secured, power exceeding the reference amount can be used, for example, during a peak time when the power use of the general load 3a becomes a peak. It can be fully used (discharged). As a result, the amount of power used from the commercial AC power supply 1 can be reduced, the electricity usage fee can be reduced, and the bias in load power use can be eliminated (it can contribute to load leveling).
[0058]
Conventionally, for the emergency operation equipment such as the fire-fighting load 3b, a private power generation facility, a storage battery facility, or a dedicated power receiving facility has been used. Can be used as a replacement. In particular, in a private power generation facility, a fuel pipe, a cooling water pipe, an exhaust pipe, and the like are required. However, since the power supply device 2 is a stationary type, such a facility is unnecessary, and there is no exhaust gas, which is effective for environmental conservation. Also, no noise countermeasures are required, and installation in a residential area is easy.
[0059]
In the above embodiment, the case where the plurality of loads are the general load 3a and the firefighting load 3b has been described as an example, but the types of the loads are not limited.
[0060]
【The invention's effect】
As described above, according to the present invention, even if the specification of the energy storage unit changes, proper operation can be performed without replacing parts and the entire device, thereby avoiding an increase in cost and an increase in work load. A power supply device with excellent versatility can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing a specific configuration of a load branching unit in the embodiment.
FIG. 3 is a block diagram showing a specific configuration of a conversion unit in the embodiment.
FIG. 4 is a diagram showing an installation example of an energy storage unit in the embodiment.
FIG. 5 is a view showing another installation example of the energy storage unit in the embodiment.
FIG. 6 is an exemplary diagram showing a wiring connection example of a terminal portion of the energy storage unit in the embodiment.
FIG. 7 is a diagram showing another example of wiring connection of the terminal portion of the energy storage unit in the embodiment.
FIG. 8 is a view showing an example of a discharge control pattern in the embodiment.
FIG. 9 is a view showing an example of a charge control pattern in the embodiment.
[Explanation of symbols]
1: Commercial AC power supply 2: Power supply device 3a: General load (steady operation equipment)
3b: Firefighting load (emergency operation equipment)
DESCRIPTION OF SYMBOLS 10 ... Load branch part 11 ... Wiring breaker contacts 12, 13 ... Electromagnetic contactor contacts 20 ... Converter 22 ... Power converter 26 ... Microprocessor (control means)
27 ... Dip switch (setting means)
30 ... Energy storage unit

Claims (1)

A load branch that has a power line that branches from a commercial AC power supply to a plurality of loads, and has a switch on a branch path of the power line,
An energy storage unit for storing electric power;
A function of converting the power of the commercial AC power supply to DC power and charging the energy storage unit, and a function of discharging the power of the energy storage unit to convert the power into AC power and supplying the AC power to the power line of the load branch unit. A conversion unit having
Setting means for setting the operating conditions of the converter and the switches;
An interface for connecting external devices,
When a control command is input from this interface, the converter and each switch are controlled in accordance with the control command. If there is no input of the control command and if there is an abnormality in the input even if there is an input, the setting is performed. Control means for controlling the conversion unit and each switch according to the setting content of the means,
A power supply device comprising:

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