JP2016086559A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of supplying power to both DC load and AC load at the time of emergency.SOLUTION: A control unit 30, at the time of emergency, establishes electrical conduction between a load side terminal 34C and emergency time terminal 34B of an AC switch 34 and establishes electrical conduction between a load side terminal 46C and emergency time terminal 46B of a DC switch 46. The conduction makes it possible to supply power of a DC power supply 28, through a step-up DC/AC inverter, to an outlet 42 to which an AC load is to be connected and supply power to an LED lamp 50A and 24-hour ventilation equipment 50B that are DC loads.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system for supplying power to a building.

  When a fuel cell, storage battery, or the like is provided as an emergency power source, these power sources output direct current power. Therefore, 100 V or 200 V alternating current (hereinafter referred to as “AC100V” or “AC200V”) is converted by conversion means such as an inverter. ) To be supplied to a household outlet. However, in recent years, for example, devices such as personal computers, audio equipment, LED lighting, etc., where AC 100V power is supplied from an outlet, but are converted to DC 12V by a converter and consumed by internal circuits (hereinafter referred to as “DC load”). Often).

  When the power of a DC power source such as a fuel cell is converted into AC by an inverter or the like and further converted into DC by a converter, power loss due to the conversion twice cannot be ignored. Therefore, Patent Document 1 discloses a DC power distribution system in which a DC power source and a DC load are connected without using an inverter or a converter, and the power of the DC power source is directly supplied to the DC load.

JP 2003-204682 A

  However, the DC power distribution system described in Patent Document 1 supplies the power of the DC power supply only to the outlet dedicated to the DC load and the outlet for the most important device in the event of an emergency such as a power failure. As a result, there is a problem that power cannot be supplied to a general AC load outlet that operates at AC 100 V or the like.

  The present invention has been made in consideration of the above facts, and an object thereof is to provide a power feeding system capable of supplying power to both a DC load and an AC load in an emergency.

  A first aspect of the present invention for solving the above problems is a DC power source that outputs DC power, and an inverter that has an input end connected to the output end of the DC power source and converts the DC output from the DC power source into AC. A distribution board side terminal to which a distribution board for supplying commercial power is connected, an inverter side terminal to which the output terminal of the inverter is connected, and an AC load side terminal to which an AC load is connected, AC switching means capable of switching between conduction between the side terminal and the AC load side terminal, and conduction between the inverter side terminal and the AC load side terminal, and an input terminal of the AC load side terminal of the AC switching means A converter for converting alternating current supplied from the distribution board into direct current, a direct current power supply side terminal to which the output end of the direct current power supply is connected, a converter side terminal to which the output end of the converter is connected, and DC including a DC load side terminal to which a DC load is connected, which can be switched between conduction between the DC power supply side terminal and the DC load side terminal, and conduction between the converter side terminal and the DC load side terminal Switching means, and control means for conducting the inverter side terminal and the AC load side terminal of the AC switching means and conducting the converter side terminal and the DC load side terminal of the DC switching means in an emergency. It is equipped with.

  According to the first aspect of the present invention, in the event of an emergency such as a power failure, the AC switching means and the DC switching means are controlled so that the AC load converts the DC power of the DC power source into AC, and the DC load has the DC power. Each of the direct currents of the power supply can be supplied.

  The invention according to claim 2 is the invention according to claim 1, further comprising an energization detection unit that detects a physical quantity indicating an energization state of the commercial power, and the control unit is configured to detect the commercial power detected by the energization detection unit. An emergency is determined when the physical quantity indicating the energized state falls below a predetermined threshold.

  According to the second aspect of the present invention, it is possible to determine an emergency such as a power failure from the energized state of the commercial power.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the front DC power source includes a plurality of power sources that output alternating current, and a power converter that converts the alternating current output by the power source into direct current. Contains.

  According to the third aspect of the present invention, a plurality of AC power sources can be bundled and used as one DC power source.

  The invention of claim 4 is the invention according to claim 1 or 2, wherein the DC power supply includes a plurality of power supplies, some of the plurality of power supplies output DC of the same voltage, and the other power supplies A power source that outputs alternating current, and a power converter that converts the alternating current output from the power source into direct current having the same voltage as direct current output from some of the plurality of power sources.

  According to invention of Claim 4, according to the demand for electric power, vehicles, such as EV (Electric Vehicle) which can be used as a direct-current power supply, can be added to several power supplies as a power supply. In addition, since each of a plurality of power supplies including EVs outputs a direct current of the same voltage, frequency and phase synchronization is not required as in the case of an alternating current power supply. Further, even if the added power supply outputs alternating current, if it is converted by a power converter and outputs direct current of the same voltage, synchronization of frequency and phase is not required as well.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the distribution board includes a first voltage terminal that outputs an alternating current of the first voltage and an alternating current of the second voltage. The inverter includes a first voltage inverter that converts a direct current output from the direct current power source into an alternating current of a first voltage, and a second direct current output from the direct current power source. A first voltage distribution board side terminal to which the first voltage terminal of the distribution board is connected, and the first voltage inverter. A first voltage inverter side terminal to which the output terminal of the first voltage inverter is connected, and a first voltage AC load side terminal to which the first voltage AC load is connected. Continuity with the voltage AC load side terminal and the first voltage inverter side First voltage AC switching means that can be switched to either conduction between a child and the first voltage AC load side terminal, and a second voltage distribution board to which the second voltage terminal of the distribution board is connected A second voltage AC load side terminal to which a second voltage AC load is connected, a second voltage inverter side terminal to which an output terminal of the second voltage inverter is connected, and a second voltage AC load side terminal to which the second voltage AC load is connected. A second switchable to either conduction between the distribution board side terminal and the second voltage AC load side terminal and conduction between the second voltage inverter side terminal and the second voltage AC load side terminal. The converter is connected to the first voltage AC load side terminal of the first voltage AC switching means, and the control means is configured to switch the first voltage AC switching in an emergency. Said first voltage inverter side terminal of said means and said Together to conduct first the voltage AC load terminal, thereby turning on said second said voltage inverter side terminal of the second voltage AC load terminal of the second voltage AC switching means.

  According to the fifth aspect of the present invention, in the event of an emergency such as a power failure, the first voltage AC load and the second voltage AC load are converted to DC power from a DC power source, and the DC load is a DC power source. Of direct current can be supplied.

  As described above, the invention according to claim 1 can supply power to both a DC load and an AC load in an emergency by controlling the AC switching unit and the DC switching unit.

  According to the second aspect of the present invention, it is possible to determine whether or not it is an emergency that requires switching of the power source based on the state of energization of the commercial power, and by controlling the AC switching unit and the DC switching unit, At times, it is possible to supply power to both the DC load and the AC load.

  According to the third aspect of the present invention, by bundling a plurality of power sources into one DC power source, it is possible to secure an amount of power that can supply power to both the DC load and the AC load in an emergency.

  According to the fourth aspect of the present invention, a plurality of power supplies that output direct current of the same voltage are provided. Since these power supplies can be easily bundled without requiring synchronization of frequency and phase, it is possible to secure an amount of power that can supply power to both the DC load and the AC load in an emergency.

  According to the fifth aspect of the present invention, the first voltage AC load is controlled in the emergency by controlling the first voltage AC switching means, the second voltage AC switching means and the DC switching means. In addition, it is possible to supply power to both the second voltage AC load and the DC load.

It is the schematic which shows an example of the electric power feeding system which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the control part in the electric power feeding system which concerns on embodiment of this invention. It is the flowchart which showed an example of the process of the electric power feeding system which concerns on embodiment of this invention. It is the schematic which shows an example of the electric power feeding system which concerns on embodiment of this invention.

[First Embodiment]
Hereinafter, an example of the first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating an example of a power feeding system 10 according to the present embodiment. As shown in FIG. 1, the power supply system 10 according to the present embodiment has the same frequency as that of commercial power (AC 100 V) supplied via the distribution board 32 and commercial power such as 50 Hz for direct current of the DC power supply 28. AC switching device 34 for switching between the electric power supplied from the step-up DC / AC inverter 40 for conversion to AC 100V. The electric power supplied via the AC switch 34 is supplied from an outlet 42 to an AC load such as a refrigerator or a television. Alternatively, it is converted to, for example, DC 12V (hereinafter referred to as “DC12V”) via the insulated AC / DC converter 44, and the LED lights 50A and 24 which are DC loads via the DC switch 46 and the fuses 48A and 48B. Each is supplied to the time ventilation equipment 50B.

  The AC switch 34 and the DC switch 46 are controlled by the control unit 30. The control unit 30 supplies the commercial power to the outlet 42 and the like by conducting the load side terminal 34C of the AC switch 34 and the normal time terminal 34A during normal time when commercial power is available. Further, the control unit 30 connects the load side terminal 34C of the AC switch 34 and the emergency terminal 34B in an emergency in which commercial power cannot be used due to a power failure or the like, and the direct current is converted to AC 100V by the step-up DC / AC inverter 40. The power of the power supply 28 is supplied to the outlet 42 and the like.

  Whether it is a normal time or an emergency is determined by the control unit 30 monitoring a physical quantity indicating a commercial power supply state. The physical quantity indicating the energized state is voltage, current, or power.

  For example, if a voltmeter is provided at the normal terminal 34A of the AC switch 34, if the voltage at the normal terminal 34A falls below a predetermined value, for example, 90V, it is determined that there is an emergency such as a power failure. Then, the power of the DC power supply 28 is supplied to the outlet 42 and the like.

  Alternatively, a sensor for detecting a magnetic field generated in the wiring by a current is provided in the wiring near the normal terminal 34A, and a current or electric energy flowing through the wiring near the normal terminal 34A is calculated based on the magnetic field detected by the sensor, You may determine with an emergency when the calculated electric current or electric energy falls below a predetermined value.

  The control unit 30 normally connects the load side terminal 46C and the normal time terminal 46A of the DC switch 46, and supplies commercial power converted to DC12V by the insulated AC / DC converter 44 to each of the DC loads. In addition, the control unit 30 causes the load side terminal 46C and the emergency terminal 46B of the DC switch 46 to conduct in an emergency and supplies the power of the DC power supply 28 to each of the DC loads.

  The insulation type AC / DC converter used in this embodiment can convert, for example, AC100V to DC12V, etc., and the insulation of the input terminal and output terminal, the input terminal and the housing, and the output terminal and the exterior are ensured. Device.

  As shown in FIG. 1, when the load side terminal 46C and the emergency terminal 46B of the DC switch 46 are made conductive, a part of the power of the DC power supply 28 is boosted by the DC / AC inverter 40 and the insulation type AC / DC converter. It can be supplied to each DC load without going through a converter such as 44. Thereby, the electric power of DC power supply can be supplied to DC load, suppressing the loss accompanying conversion of electric power AC / DC.

  The DC power source 28 is a vehicle 36A capable of supplying power such as EV, HV (Hybrid Vehicle), PHV (Plug-in Hybrid Vehicle) or FCV (Fuel Cell Vehicle), a battery 36B such as a fuel cell or a storage battery, or solar power generation. Device 36C. The vehicle 36A, the battery 36B, and the solar power generation device 36C are each provided with conversion means such as an inverter, and convert a direct current into AC100V and output it. AC100V output from the vehicle 36A, the battery 36B, and the solar power generation device 36C is converted into the same DC voltage (for example, DC12V) by the insulated AC / DC converters 38A, 38B, and 38C. In FIG. 1, each power source constituting the DC power source 28 includes an AC power source and an insulated AC / DC converter that converts the AC output from the AC power source into a DC having the same voltage. However, some of the power supplies constituting the DC power supply 28 do not go through the isolated AC / DC converter on condition that the DC of the same voltage as that of the isolated AC / DC converter included in the other power supplies is output. A DC voltage may be output.

  FIG. 2 is a block diagram illustrating a schematic configuration of the control unit 30 in the power supply system 10 according to the present embodiment. The control unit 30 includes a CPU (Central Processing Unit) 12, a HDD (Hard Disk Drive) 14, a RAM (Random Access Memory) 16, a network I / F unit 18, and a ROM (Read Only Memory) 20. . The control unit 30 includes a display unit 22, an operation input unit 24, and a bus 26, and has functions of a terminal for inputting information and a terminal for displaying information.

  The CPU 12 controls the entire operation of the HEMS. The HDD 14 is a non-volatile storage device in which a program for controlling the AC switch 34 and the DC switch 46, an OS (Operating System), data for controlling the AC switch 34 and the DC switch 46, and the like are recorded. . The RAM 16 is a volatile storage device in which an OS, a program, or data is expanded. The network I / F unit 18 is for connecting to a network, and includes a NIC (Network Interface Card) and its driver. The ROM 20 is a nonvolatile storage device that stores a boot program that operates when the HEMS is activated. The display unit 22 displays information related to the power supply system 10 to the user. The operation input unit 24 is used when a user inputs an operation or information of the power supply system 10. Examples of the operation input unit 24 include an input device such as a touch panel and a keyboard, and a pointing device such as a trackball, a pen tablet, and a mouse. . The bus 26 is used when information is exchanged.

  FIG. 3 is a flowchart showing an example of processing of power supply system 10 according to the present exemplary embodiment. In step 300, it is determined whether or not it is an emergency such as a power failure based on whether or not the voltage at the normal terminal 34A of the AC switch 34 has fallen below a predetermined value. If the determination in step 300 is affirmative, in step 302, the load-side terminal 34C of the AC switch 34 and the emergency terminal 34B are made conductive, and the load-side terminal 46C and the emergency terminal 46B of the DC switch 46 are connected. The AC switch 34 and the DC switch 46 are switched in response to an emergency in a conducting state.

  In step 304, it is determined whether or not the commercial power has been restored depending on whether or not the voltage at the normal terminal 34A of the AC switch 34 has become a predetermined value or more. If the determination in step 304 is affirmative, in step 306, the load side terminal 34C of the AC switch 34 and the normal time terminal 34A are brought into conduction, and the load side terminal 46C and the normal time terminal 46A of the DC switch 46 are connected. Then, the AC switch 34 and the DC switch 46 are switched to correspond to the normal time, and the process returns.

  As described above, according to the present embodiment, in an emergency, the power of the DC power supply 28 is supplied to the DC load via the DC switch 46 and AC via the boost DC / AC inverter 40 and the AC switch 34. Each is supplied to a load. As a result, power can be supplied to both the DC load and the AC load in an emergency.

[Second Embodiment]
Next, an example of the second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is a schematic diagram illustrating an example of the power feeding system 100 according to the present embodiment. The power feeding system 100 according to the present embodiment shown in FIG. 4 is different in that the distribution board 132 can output AC 200V in addition to AC 100V. The power supply system 100 illustrated in FIG. 4 includes an AC 200 V switch 134 that supports 200 V AC, a step-up DC / AC inverter 140 that supports 200 V, and an AC 200 V load 142. Furthermore, the DC power supply 128 of the power supply system 100 is larger than the DC power supply 28 of the first embodiment, and further includes vehicles 36D, 36E, and 36F such as EVs that can supply power. In addition, there are insulated AC / DC converters 38D, 38E, and 38F for converting AC 100V output from these vehicles 36D, 36E, and 36F into the same DC voltage (for example, DC 12V).

  Since other configurations are the same as those of the first embodiment, the same reference numerals are given to configurations common to the first embodiment, and detailed description thereof is omitted.

  In the present embodiment, the normal time or the emergency time is determined by the control unit 130 monitoring the voltage at the normal time terminal 134A of the AC 200V switch 134 or the normal time terminal 34A of the AC switch 34 or the like. When the voltage at the normal time terminal 134A or the normal time terminal 34A falls below a predetermined value, for example, 180V or 90V, respectively, it is determined that there is an emergency such as a power failure, and the power of the DC power supply 128 is connected to the outlet 42 and AC Supplied to the load 142 and the like.

  The AC 200 V switch 134, the AC switch 34 and the DC switch 46 are controlled by the control unit 130. The control unit 130 conducts the load side terminal 134C of the AC 200V switch 134 and the normal time terminal 134A at normal times when commercial power is available, and connects the load side terminal 34C of the AC switch 34 and the normal time terminal 34A. Conductive power is supplied, and commercial power is supplied to the AC 200V load 142, the outlet 42, and the like. Further, in an emergency in which commercial power cannot be used due to a power failure or the like, the control unit 130 causes the load side terminal 134C and the emergency terminal 134B of the AC 200V switch 134 to conduct and the load side terminal 34C of the AC switch 34 and the emergency time. Electric power obtained by converting the power of the DC power supply 28 into AC by making the terminal 34B conductive is supplied to the AC 200V load 142, the outlet 42, and the like.

  The control unit 130 normally connects the load side terminal 46C of the DC switch 46 and the normal time terminal 46A, and supplies commercial power converted to DC12V by the insulated AC / DC converter 44 to each of the DC loads. In addition, in the event of an emergency, the control unit 130 causes the load side terminal 46C and the emergency terminal 46B of the DC switch 46 to conduct and supplies the power of the DC power supply 28 to each of the DC loads.

  As shown in FIG. 4, also in this embodiment, when the load side terminal 46C and the emergency terminal 46B of the DC switch 46 are made conductive, a part of the power of the DC power supply 28 is supplied to the boost DC / AC inverter 40 and It can be supplied to each DC load without going through a converter such as the insulated AC / DC converter 44. Thereby, the electric power of DC power supply can be supplied to DC load, suppressing the loss accompanying conversion of electric power AC / DC.

  As described above, according to the present embodiment, in an emergency, the power of the DC power supply 128 is supplied to the DC load via the DC switch 46, the AC 200V boost DC / AC inverter 140, the AC 200V switch 134, and the boost DC. / AC inverter 40 and AC switch 34 are respectively supplied to AC loads. As a result, in an emergency, it is possible to supply power to an AC 200V AC load in addition to an AC 100V AC load and a DC load.

10 Power supply system 12 CPU
14 HDD
16 RAM
20 ROM
26 Bus 28 DC Power Supply 30 Control Unit 32 Distribution Board 34 AC Switch 34A Normal Terminal 34B Emergency Terminal 34C Load Side Terminal 36A Vehicle 36B Battery 36C Photovoltaic Generators 36D, 36E, 36F Vehicles 38A, 38B, 38C, 38D , 38E, 38F Insulation type AC / DC converter 40 Step-up DC / AC inverter 42 Outlet 44 Insulation type AC / DC converter 46 DC switch 46A Normal terminal 46B Emergency terminal 46C Load side terminal 50A LED lighting 50B 24 hour ventilation equipment 100 Power supply system 128 DC power supply 130 Control unit 132 Distribution board 134 AC200V switch 134A Normal terminal 134B Emergency terminal 134C Load side terminal 140 Boost DC / AC inverter 142 AC200V load

Claims (5)

A DC power supply that outputs DC power;
An input terminal connected to an output terminal of the DC power source, and an inverter that converts the DC output from the DC power source into AC;
A distribution board side terminal to which a distribution board for supplying commercial power is connected, an inverter side terminal to which the output terminal of the inverter is connected, and an AC load side terminal to which an AC load is connected, the distribution board side terminal AC switching means that can be switched to either conduction between the AC load side terminal and the inverter side terminal and the AC load side terminal,
An input terminal connected to an AC load side terminal of the AC switching means, and a converter for converting AC supplied from the distribution board to DC;
A DC power supply side terminal to which the output terminal of the DC power supply is connected; a converter side terminal to which the output terminal of the converter is connected; and a DC load side terminal to which a DC load is connected, the DC power supply side terminal and the DC load DC switching means switchable to either conduction with a side terminal and conduction between the converter side terminal and the DC load side terminal;
In an emergency, the control means for conducting the inverter side terminal of the AC switching means and the AC load side terminal, and conducting the converter side terminal of the DC switching means and the DC load side terminal,
Power supply system with Comprising an energization detection means for detecting a physical quantity indicating the energization state of the commercial power,
The power supply system according to claim 1, wherein the control unit determines that an emergency has occurred when a physical quantity indicating an energization state of the commercial power detected by the energization detection unit falls below a predetermined threshold.   The power supply system according to claim 1, wherein the DC power supply includes a plurality of power supplies that each output alternating current, and a power converter that converts the alternating current output from the power supply into direct current.   The DC power supply includes a plurality of power supplies, some of the plurality of power supplies output a direct current of the same voltage, and the other power supplies output a power supply that outputs an alternating current and the alternating current output by the power supply. The power feeding system according to claim 1 or 2, comprising a power converter that converts a direct current having the same voltage as a direct current output from some of the power supplies. Each of the distribution boards has a first voltage terminal that outputs an alternating current of a first voltage and a second voltage terminal that outputs an alternating current of a second voltage;
The inverter includes a first voltage inverter that converts direct current output from the direct current power source into alternating current of a first voltage, and a second voltage inverter that converts direct current output from the direct current power source into a second voltage alternating current. ,
The AC switching means includes a first voltage distribution board side terminal to which the first voltage terminal of the distribution board is connected, and a first voltage inverter side terminal to which the output terminal of the first voltage inverter is connected. And a first voltage AC load side terminal to which a first voltage AC load is connected, conduction between the first voltage distribution board side terminal and the first voltage AC load side terminal, and the first The voltage inverter side terminal and the first voltage AC load side terminal can be switched to any one of the first voltage AC load switching terminal and the second voltage terminal of the distribution board is connected to the second voltage terminal. A voltage distribution board side terminal, a second voltage inverter side terminal to which an output terminal of the second voltage inverter is connected, and a second voltage AC load side terminal to which a second voltage AC load is connected, A second voltage distribution board side terminal and a second voltage AC load side terminal; Conductive, and comprises a second voltage AC switching means capable of switching to either one of conduction of the second voltage inverter side terminal and the second voltage AC load terminal,
An input terminal of the converter is connected to a first voltage AC load side terminal of the first voltage AC switching means;
The control means causes the first voltage inverter side terminal and the first voltage AC load side terminal of the first voltage AC switching means to conduct in an emergency, and the second voltage AC switching means The power feeding system according to any one of claims 1 to 4, wherein the second voltage inverter side terminal and the second voltage AC load side terminal are electrically connected.

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