JP2009153338A - Dc power distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a malfunction due to an instantaneous power failure of an AC power system. <P>SOLUTION: In dispersed power supply units 2A, 2B, a communication section 23 having received a control signal from a control device 4 stops a charging section 21 and starts a switching control section 22a of a DC-DC conversion section 22 so that the DC-DC conversion section 22 is actuated to supply DC power to a distribution point path Lp. If the power failure of an AC power system AC is an instantaneous power failure which can be recovered in a very short time, an output monitoring section 3b of the power failure detection section 3 does not detect the power failure while discharged charges of a smoothing capacitor C1 provided on an output stage of the AC-DC conversion device 1 flow to a diode 3a. Accordingly, this system prevents a malfunction in which instantaneous power failure is falsely determined as a power failure to start the operation of the dispersed power supply units 2A, 2B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a DC power distribution system.

  2. Description of the Related Art Conventionally, there has been provided a DC distribution system that distributes indoors DC power obtained by AC / DC conversion of AC power supplied from an AC power system (commercial power system) (see, for example, Patent Document 1).

In the DC power distribution system described in Patent Document 1, in addition to the AC / DC converter (AC / DC converter) and the secondary battery, the DC voltage output from the AC / DC converter or the secondary battery is set to a desired level. A DC / DC converter (DC / DC converter) that converts to DC voltage is housed in an insulating container in the same form as the branch switch, and when a power failure is detected by the power failure detection means, A switchboard that was supplied with DC power was built in the distribution board.
Japanese Patent Laying-Open No. 2005-224066 (FIG. 6, paragraph 0028)

  However, in the conventional example described in Patent Document 1, since a power failure of the AC power system is detected at the power supply side terminal connected to the AC power system, that is, the input side of the AC / DC converter, the AC power system There is a problem that the power failure detection means detects the instantaneous power failure and power is erroneously supplied from the secondary battery.

  This invention is made | formed in view of the said situation, The objective is to provide the direct current power distribution system which can prevent the malfunctioning resulting from the instantaneous power failure of an alternating current power system.

  In order to achieve the above object, an invention according to claim 1 is an AC / DC converter that includes a converter having a smoothing capacitor in an output stage, converts AC power supplied from an AC power system into DC power, and DC power. One or more distributed power sources having means for storing or generating electricity and DC / DC converting means for adjusting the voltage level of the DC power, and an AC / DC converter and one or more distributed power sources connected in parallel to the load Distribution line to be installed, a power failure detection means for detecting a power failure of the AC power system provided on the load side from the AC / DC converter, and a DC of each distributed power source when a power failure of the AC power system is detected by the power failure detection means A control means for adjusting the voltage level by controlling the direct current conversion means.

  According to the first aspect of the present invention, the output voltage of the AC / DC converter is immediately reduced by the charge of the smoothing capacitor provided in the output stage of the AC / DC converter even when the AC power system is momentarily interrupted. Therefore, the power failure detection means provided on the load side from the AC / DC converter does not detect a power failure, and as a result, the control means can be prevented from erroneously performing a control operation at the time of the power failure. In addition, since the primary side (input side) and the secondary side (output side) are insulated in the AC / DC converter, there is no need to provide electrical insulation between the power failure detection means and the control means. The configuration can be simplified.

  According to a second aspect of the present invention, in the first aspect of the present invention, the power failure detection means measures a potential difference between the diode inserted between the output terminal of the AC / DC converter and the distribution path, and the anode and cathode of the diode. And an output monitoring unit for determining a power failure in the AC power system.

  According to invention of Claim 2, the circuit structure of a power failure detection means can be simplified.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the DC / DC converting means has an output characteristic in which the output voltage monotonously decreases with respect to the output current, and the control means outputs from a plurality of distributed power supplies. The DC / DC conversion means of each distributed power source is controlled so that the voltage levels of the DC power to be made coincide with each other.

  According to the third aspect of the present invention, it is possible to prevent the back flow from one distributed power source to another distributed power source and to supply DC power by sharing each distributed power source.

  ADVANTAGE OF THE INVENTION According to this invention, the malfunctioning resulting from the instantaneous power failure of an alternating current power system can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The direct current distribution system of this embodiment includes an alternating current / direct current converter 1 that converts alternating current power supplied from an alternating current power system (commercial power system) AC into direct current power as shown in FIG. A plurality (two in the illustrated example) of distributed power sources 2A and 2B for supplying power, a distribution line Lp for connecting the AC / DC converter 1 and the plurality of distributed power sources 2A and 2B in parallel to the load L, and AC / DC The power failure detection unit 3 that is provided on the load L side from the converter 1 and detects a power failure of the AC power system AC, and when the power failure detection unit 3 detects a power failure of the AC power system AC, each of the distributed power sources 2A and 2B A control device 4 for adjusting a voltage level by controlling a direct current / direct current converter (described later), direct current power output from the alternating current / direct current converter 1 with respect to the distribution line Lp, and output from the distributed power sources 2A and 2B. Alternatively distribute DC power And a cooperative control unit 5 for. The power failure detection unit 3 includes a diode 3a having an anode connected to the output terminal of the AC / DC converter 1 and a cathode connected to the power distribution path Lp via the cooperative control unit 5, and between the anode and the cathode of the diode 3a. The output monitoring unit 3b that measures the potential difference of the AC power system AC and determines the power failure of the AC power system AC. When the AC power system AC fails, a power failure detection signal is output from the output monitoring unit 3b to the control device 4. . However, the configuration of the power failure detection unit 3 is not limited to this, and may be a configuration in which a power failure is detected by another detection method.

  The AC / DC converter 1 is output from a full-wave rectifier 11 for full-wave rectification of an input voltage (AC voltage) Vac input from the AC power system AC as shown in FIG. And an AC / DC converter 10 that converts a pulsating flow into a direct current. The AC / DC converter 10 is a conventionally known flyback converter type switching power supply, and smoothes a pulsating voltage with a smoothing capacitor C0 to be smoothed into a series circuit of a primary winding of a flyback transformer T and a switching element Q. The DC voltage is applied, the switching element Q is switched by the control circuit 10a, the voltage induced in the secondary winding of the flyback transformer T is rectified by the diode D1, and further smoothed by the smoothing capacitor C1. The output voltage (DC voltage) Vdc of the voltage level is obtained. Further, a series circuit of voltage dividing resistors R1 and R2 is connected to the smoothing capacitor C1 at the output stage, and a detection voltage Vx (a voltage proportional to the output voltage Vdc) Vx taken from the connection point of the voltage dividing resistors R1 and R2 is compared with the comparator CP. Compared with the reference voltage Vth, the control circuit 10a performs PWM control of the switching element Q so that the detection voltage Vx matches the reference voltage Vth. Since the output of the comparator CP is input to the control circuit 10a via the photocoupler PC, the primary side (input side) and the secondary side (output side) of the AC / DC converter 10 are electrically insulated. It is in the state.

  Each distributed power source includes a means for storing or generating DC power (for example, a secondary battery, a solar battery, a fuel cell, etc.) and a DC / DC converter for adjusting (stepping down or boosting) the voltage level of the DC power. DC / DC converter). The illustrated distributed power supplies 2A and 2B have the same configuration, and are supplied from the secondary battery 20 made of a nickel metal hydride battery or a lithium ion battery and the AC / DC converter 1 as shown in FIG. A charging unit 21 that charges the secondary battery 20 with DC power or DC power supplied from another distributed power source (not shown) having a solar battery or a fuel cell, and the output voltage of the secondary battery 20 is set to a desired voltage. A DC / DC converter 22 for converting to a level and a communication unit 23 for communicating with the control device 4 as described later are provided.

  The DC / DC converter 22 is a conventionally known flyback converter type switching power supply as shown in FIG. 2B, and an input voltage (DC voltage) Vin input from the secondary battery 20 is a flyback transformer. The voltage applied to the series circuit of the primary winding of T1 and the switching element Q1 is switched by the switching control unit 22a, and the voltage induced in the secondary winding of the flyback transformer T1 is rectified by the diode D2. Further, the output voltage (DC voltage) Vo at a desired voltage level is obtained by smoothing with the smoothing capacitor C2. Further, a series circuit of voltage dividing resistors R3 and R4 is connected to the smoothing capacitor C2 at the output stage, and a detection voltage (voltage proportional to the output voltage Vo) Vy and a reference voltage taken in from the connection point of the voltage dividing resistors R3 and R4. A voltage corresponding to the difference from Vr is output from the amplifier AP, and the switching control unit 22a performs PWM control of the switching element Q1 so that the output of the amplifier AP becomes zero. Since the output of the amplifier AP is input to the switching control unit 22a via the photocoupler PC1, the primary side (input side) and the secondary side (output side) of the DC / DC conversion unit 22 are electrically connected. Insulated state. The DC / DC converter 22 is not limited to the circuit configuration described above, and may not be an insulating type as long as it is a converter having a smoothing capacitor in the output stage. However, in order to cope with both cases where the output voltage Vo is higher (step-up) and lower (step-down) than the input voltage Vin, the flyback converter type DC / DC converter described above is desirable.

  Here, an impedance element (for example, a resistance element) 22b is connected to the high potential side of the smoothing capacitor C2, and the output element (current-voltage characteristic) of the DC / DC converter 22 is negatively inclined by the impedance element 22b. (See FIG. 3). The DC / DC converter 22 can increase or decrease the reference voltage Vr according to a control command from the control device 4 received by the communication unit 23 as will be described later. The voltage level of Vo can be adjusted.

  The output monitoring unit 3b of the power failure detection unit 3 operates with DC power supplied from the AC / DC converter 1 when the AC power system AC is not powered, and has a large capacity electrolytic capacitor (not shown) when the AC power system AC is powered down. The power failure detection signal can be output to the control device 4 even when the AC power system AC fails.

  As shown in FIG. 4, the control device 4 includes a signal input unit 40 to which a power failure detection signal output from the power failure detection unit 3 is input, a communication unit 41 that communicates with the communication units 23 of the distributed power sources 2 </ b> A and 2 </ b> B, The voltage detection unit 42 that detects the voltage level of the DC power supplied from the power sources 2A and 2B to the distribution line Lp, and the operation start for the distributed power sources 2A and 2B when a power failure detection signal is input to the signal input unit 40 And a processing unit 43 for generating a control command for instructing and transmitting a control signal including the control command from the communication unit 23, and a power supply unit 44 for supplying operating power to each unit. The power supply unit 44 creates an operating power source from the DC power supplied from the AC / DC converter 1 when the AC power system AC is not powered down, and is supplied from the distributed power sources 2A and 2B when the AC power system AC is powered down. An operating power source is created from direct current power, but a large-capacity electrolytic capacitor (in order to secure short-term power from the time when the alternating current power system AC fails to the start of power supply to the distributed power sources 2A and 2B) (Not shown). That is, when the AC power system AC fails, the signal input unit 40, the communication unit 41, and the arithmetic processing unit 43 are operable by the power supply unit 44 creating an operating power supply by the electric charge charged in the electrolytic capacitor. Therefore, the distributed power sources 2A and 2B can be operated by remote control to start supplying DC power. Note that a dedicated line may be used for communication between the communication unit 41 of the control device 4 and the communication unit 23 of the distributed power supplies 2A and 2B, but a distribution line Lp to which DC power is supplied may be used. Absent. If the power distribution path Lp is used as a communication medium, there is an advantage that wiring saving can be achieved as compared with the case where a dedicated line is used.

  Next, the operation of the control device 4 will be described. When the AC power system AC is not out of power (when there is no power outage), that is, when the power outage detection signal is not output from the power outage detection unit 3, the charging unit 21 operates in each of the distributed power sources 2A and 2B and is secondary. Although the battery 20 is charged, the reference voltage Vr input to the amplifier AP is adjusted to a value lower than that at the time of the power failure so that the output voltage Vo of the DC / DC converter 22 is output from the AC / DC converter 1. The DC power is not supplied from the distributed power sources 2A and 2B to the distribution line Lp, and the DC power is supplied only from the AC / DC converter 1 to the distribution line Lp. On the other hand, when the AC power system AC fails, the output voltage of the AC / DC converter 1 becomes zero, but the output voltage Vo of the DC / DC converter 22 is applied to the cathode of the diode 3a. A potential difference in the opposite direction is generated, and the output monitoring unit 3b detects the potential difference in the opposite direction and outputs a power failure detection signal. Then, the power failure detection signal output from the power failure detection unit 3 is input to the signal input unit 40 of the control device 4. When a power failure detection signal is input to the signal input unit 40, the arithmetic processing unit 43 increases the reference voltage Vr input to the amplifier AP with respect to the distributed power sources 2A and 2B to the voltage required for the load. A control command for increasing the output voltage Vo of the DC converter 22 is generated, and a control signal including the control command is transmitted from the communication unit 23. On the other hand, in each of the distributed power supplies 2A and 2B, the communication unit 23 that has received the control signal stops the charging unit 21 and increases the reference voltage Vr that is input to the amplifier AP. To supply DC power. Here, when the power failure of the AC power system AC is an instantaneous power failure that recovers in a very short time, the discharge charge of the smoothing capacitor C1 provided at the output stage of the AC / DC converter 1 flows to the diode 3a. Since the output monitoring unit 3b of the power failure detection unit 3 does not detect a power failure while the power is being interrupted, it is possible to prevent malfunctions such as starting the operation of the distributed power sources 2A and 2B by determining the instantaneous power failure as a power failure as in the conventional example. . When the AC power system AC recovers and the power failure detection signal is not output from the power failure detection unit 3, the arithmetic processing unit 43 sets the reference voltage Vr input to the amplifier AP to the distributed power sources 2A and 2B as a non-power failure. A control command instructing to return to a low value of time is generated and a control signal including the control command is transmitted from the communication unit 23. On the other hand, in each of the distributed power supplies 2A and 2B, the communication unit 23 that has received the control signal operates the charging unit 21 and decreases the reference voltage Vr input to the amplifier AP of the DC / DC conversion unit 22 to thereby generate AC / DC. The output voltage Vo of the DC / DC converter 22 is lowered until it is lower than the output voltage of the converter 1.

  By the way, if there is a difference in output voltage between the two distributed power supplies 2A and 2B, current is supplied to the load L only from the distributed power supply (DC / DC converter 22) having a relatively high output voltage. On the other hand, in a distributed power source (DC / DC converter 22) having a relatively low output voltage, there is a possibility that current flows backward and breaks down. Therefore, in the present embodiment, the voltage applied to the distribution path Lp from the distributed power sources 2A and 2B is detected by the voltage detection unit 42 of the control device 4, and the detection voltage of the voltage detection unit 42 is detected by the arithmetic processing unit 43 of the control device 4. Generates a voltage adjustment command for matching the voltage with a predetermined target voltage (for example, a voltage applied from the AC / DC converter 1 to the distribution line Lp during a non-power failure) and communicates a control signal including the voltage adjustment command The unit 41 causes the distributed power sources 2A and 2B to transmit. In each of the distributed power supplies 2A and 2B, the communication unit 23 changes the reference voltage Vr of the DC / DC conversion unit 22 based on a voltage adjustment command included in the control signal, so that the output voltage of the DC / DC conversion unit 22 is changed. To match the target voltage. For example, the current-voltage characteristic in the DC / DC conversion unit 22 of the distributed power source 2A (dotted line a in FIG. 3) and the current-voltage characteristic in the DC / DC conversion unit 22 of the distributed power source 2B (dotted line b in FIG. 3) Even if there is a variation between the two, the load current is shared by the two distributed power sources 2A and 2B by making the output voltage coincide with the target voltage Vt because each current-voltage characteristic has a negative slope. Can be paid. That is, the output current IoA of the DC / DC converter 22 of the distributed power source 2A having the current-voltage characteristic of the dotted line A and the output current IoB of the DC / DC converter 22 of the distributed power source 2B having the current-voltage characteristic of the dotted line B ( The combined current with <IoA) becomes the load current.

  As described above, according to the present embodiment, the output characteristics (current-voltage characteristics) of the DC / DC converter 22 are given a negative slope so that the output voltages of the plurality of DC / DC converters 22 are equalized. Since the adjustment is performed, backflow from one distributed power source (for example, 2A) to another distributed power source (for example, 2B) is prevented, and DC power (load current) is supplied by sharing the power between the distributed power sources 2A and 2B. can do. Further, more power can be supplied to the load L than the distributed power supplies 2A and 2B supply alone. However, reverse current flow in the distributed power supplies 2A and 2B may be prevented by inserting a rectifying element such as a diode on the output side of the DC / DC converter 22.

  Furthermore, another embodiment of the present invention will be described with reference to FIG. The embodiment described below assumes a detached house as a building to which the present invention is applied, but does not prevent the technical idea of the present invention from being applied to an apartment house. The house H is provided with a DC device 102 as a load driven by DC power as shown in FIG. 5, and the AC / DC converter 1 and a plurality (three in the illustrated example) are connected via the cooperative control unit 5. DC power is supplied to the DC device 102 through the distribution path Wdc connected to the distributed power sources 2A to 2C. Between the cooperative control unit 5 and the DC device 102, there is a DC breaker 114 that monitors the current flowing through the distribution path Wdc and restricts or cuts off the power supply to the DC device 102 on the distribution path Wdc when an abnormality is detected. Provided.

  The distribution path Wdc is a DC power supply path and is also used as a communication path, and is a device connected to the distribution path Wdc by superimposing a communication signal for transmitting data on a DC voltage using a high-frequency carrier wave. Communication between them. This technique is similar to a power line carrier technique in which a communication signal is superimposed on an AC voltage in a power line that supplies AC power.

  The distribution path Wdc is connected to the home server 116 via the AC / DC converter 1. The in-home server 116 is a main device for constructing a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem constructed by the DC device 102 in the home network.

  In the example shown in the drawing, as an subsystem, an illumination system comprising an information equipment system K101 comprising an information-system DC device 102 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination system DC equipment 102 such as a lighting fixture. K102, K105, an intercom system K103 including a DC device 102 for handling visitors and monitoring intruders, a residential alarm system K104 including a DC device 102 for an alarm system such as a fire detector, and the like. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The above-described DC breaker 114 is provided in association with a subsystem. In the illustrated example, four DCs are associated with the information equipment system K101, the lighting system K102 and the intercom system K103, the house alarm system K104, and the lighting system K105. A breaker 114 is provided. When a plurality of subsystems are associated with one DC breaker 114, a connection box 121 that divides the system of the power distribution path Wdc is provided for each subsystem. In the illustrated example, a connection box 121 is provided between the illumination system K102 and the intercom system K103.

  As the information equipment system K101, there is provided an information equipment system K101 composed of a DC equipment 102 connected to a DC outlet 131 arranged in advance in the house H (constructed when the house H is constructed) in the form of a wall outlet or a floor outlet.

  The lighting systems K102 and K105 include a lighting system K102 including a lighting fixture (DC device 102) arranged in advance in the house H, and a lighting fixture (DC device 102) connected to a hook ceiling 132 arranged in advance on the ceiling. An illumination system K105 is provided. At the time of interior construction of the house H, the contractor attaches the lighting fixture to the hook ceiling 132, or the resident himself attaches the lighting fixture.

  In addition to using an infrared remote control device, a control instruction for the lighting apparatus that is the DC device 102 constituting the lighting system K102 can be given using a communication signal from the switch 141 connected to the power distribution path Wdc. That is, the switch 141 has a communication function together with the DC device 102. In addition, a control instruction may be given by a communication signal from another DC device 102 in the home network or the home server 116 regardless of the operation of the switch 141. The instructions to the lighting fixture include lighting, extinguishing, dimming, and blinking lighting.

  Since any DC device 102 can be connected to the DC outlet 131 and the hooking ceiling 132 described above and DC power is output to the connected DC device 102, the DC outlet 131 and the hooking ceiling 132 are distinguished below. When it is not necessary, it is called “DC outlet”.

  These DC outlets have a plug-in connection port into which a contact (not shown) provided directly on the DC device 102 or a contact (not shown) provided via a connection line is inserted into the body. The contact receiver that directly contacts the contact inserted into the connection port is held by the container. That is, the direct current outlet supplies power in a contact manner. When the DC device 102 connected to the DC outlet has a communication function, a communication signal can be transmitted through the power distribution path Wdc. A communication function is provided not only in the DC device 102 but also in the DC outlet.

  The home server 116 not only is connected to the home network, but also has a connection port connected to the wide area network NT that constructs the Internet. When the in-home server 116 is connected to the wide area network NT, it is possible to receive services from the center server 200 that is a computer server connected to the wide area network NT.

  The service provided by the center server 200 includes a service that enables monitoring and control of equipment (including mainly the DC equipment 102 but also other equipment having a communication function) connected to the home network through the wide area network NT. is there. This service makes it possible to monitor and control devices connected to the home network using a communication terminal (not shown) having a browser function such as a personal computer, Internet TV, or mobile phone.

  The in-home server 116 has both functions of communication with the center server 200 connected to the wide area network NT and communication with equipment connected to the home network, and identification information on equipment in the home network ( Here, it is assumed that an IP address is used).

  The home server 116 enables monitoring and control of home devices through the center server 200 from a communication terminal connected to the wide area network NT by using a communication function with the center server 200. The center server 200 mediates between home devices and communication terminals on the wide area network NT.

  When monitoring and controlling home devices from a communication terminal, monitoring and control requests are stored in the center server 200, and the home device periodically performs one-way polling communication to monitor from the communication terminal. And receive control requests. With this operation, it is possible to monitor and control devices in the house from the communication terminal.

  Further, when an event that should be notified to the communication terminal, such as a fire detection, occurs in the home device, the home device notifies the center server 200, and the center server 200 notifies the communication terminal by e-mail.

  An important function among the communication functions with the home network in the home server 116 is the detection and management of devices constituting the home network. The home server 116 automatically detects devices connected to the home network by applying UPnP (Universal Plug and Play). The home server 116 includes a display device 117 having a browser function, and displays a list of detected devices on the display device 117. The display device 117 has a configuration with a touch panel type or an operation unit, and can perform an operation of selecting desired contents from options displayed on the screen of the display device 117. Therefore, the user (contractor or householder) of the home server 116 can monitor or control the device on the screen of the display device 117. The display device 117 may be provided separately from the home server 116.

  The in-home server 116 manages information related to device connection, and grasps the type, function, and address of the device connected to the home network. Accordingly, the devices in the home network can be operated in conjunction with each other. Information on the connection of the device is automatically detected as described above. In order to operate the device in an interlocking manner, the device itself is automatically associated with the attribute held by the device itself, and the home server 116 is configured as a personal computer. It is also possible to connect various information terminals and use the browser function of the information terminals to associate devices.

  Each device holds the relationship of the interlocking operation of the devices. Therefore, the device can operate in an interlocked manner without passing through the home server 116. By associating the linked operations for each device, for example, by operating a switch that is a device, it is possible to turn on or off the lighting fixture that is the device. In many cases, the association of the interlocking operations is performed within the subsystem, but the association beyond the subsystem is also possible.

  Since the driving voltage of the DC device 102 is selected from a plurality of types of voltages according to the device, the DC / DC converter is provided in the cooperative control unit 5 and the DC voltage obtained from the AC / DC converter 1 and the distributed power sources 2A to 2C. Is preferably converted to the required voltage. Normally, one type of voltage is supplied to one subsystem (or DC device 102 connected to one DC breaker 114), but three or more wires are used for one subsystem. A plurality of types of voltages may be supplied. Alternatively, it is also possible to adopt a configuration in which the distribution path Wdc is a two-wire system and the voltage applied between the lines is changed with time. The DC / DC converter may be provided in a plurality of dispersed manners like the DC breaker.

  In the above configuration example, only one AC / DC converter 1 is illustrated, but a plurality of AC / DC converters 1 can be arranged in parallel, and a plurality of AC / DC converters 1 are provided. Sometimes, it is desirable to increase or decrease the number of AC / DC converters 1 to be operated according to the size of the load.

  The AC / DC converter 1, the distributed power sources 2 </ b> A to 2 </ b> C, the power failure detection unit 3, the control device 4, the cooperative control unit 5, and the DC breaker 114 are provided with a communication function. It is possible to perform a cooperative operation to cope with a load state including the power supplies 2A to 2C and the DC device 102. The communication signal used for this communication is transmitted in the form of being superimposed on the DC voltage in the same manner as the communication signal used for the DC device 102.

  In the above example, the AC / DC converter 1 is arranged in the distribution board 110 in order to convert the AC power output from the main breaker 111 into DC power by the AC / DC converter 1. On the output side of 111, an AC supply line is branched into a plurality of systems by a branch breaker (not shown) provided in the distribution board 110, and an AC / DC conversion device is provided on the AC supply line of each system to provide direct current for each system. You may employ | adopt the structure converted into electric power.

  In this case, an AC / DC converter and a distributed power supply can be provided for each floor or room of the house H. Therefore, the power supply for supplying DC power (AC / DC converter and distributed power supply) should be managed for each system. In addition, since the distance of the distribution path Wdc from the DC device 102 that uses DC power becomes small, it is possible to reduce power loss due to a voltage drop in the distribution path Wdc. Further, the main breaker 111 and the branch breaker are housed in the distribution board 110, and the AC / DC converter 1, the power failure detection unit 3, the control device 4, the cooperative control unit 5, the DC breaker 114, and the home server 116 are distributed. You may store in the board different from 110.

1 shows an embodiment of the present invention, (a) is an overall system configuration diagram, and (b) is a block diagram of an AC / DC converter. (A) is a block diagram showing the distributed power supply in the above, and (b) is a block diagram showing a DC / DC converter of the distributed power supply. It is explanatory drawing of the output characteristic of the DC / DC converting part in the same as the above. It is a block diagram which shows the control apparatus same as the above. It is a system configuration | structure figure which shows another embodiment of this invention.

Explanation of symbols

AC AC power system 1 AC / DC converter 2A, 2B Distributed power supply 3 Power failure detection unit 4 Controller L Load Lp Distribution line

Claims (3)

  Consists of a converter having a smoothing capacitor in the output stage, and converts the AC power supplied from the AC power system to DC power, means for storing or generating DC power, and adjusting the voltage level of the DC power One or more distributed power supplies having DC / DC conversion means for performing the operation, an AC / DC converter and a distribution path for connecting the one or more distributed power supplies in parallel to the load, and provided on the load side from the AC / DC converter And a control means for adjusting the voltage level by controlling the DC / DC conversion means of each distributed power source when the power failure detection means detects a power failure of the AC power system. A DC power distribution system characterized by comprising:   The power failure detection means includes a diode inserted between the output terminal of the AC / DC converter and the distribution line, and an output monitoring unit for measuring a potential difference between the anode and the cathode of the diode and determining a power failure of the AC power system. The DC power distribution system according to claim 1, further comprising:   The direct current / direct current conversion means has an output characteristic in which the output voltage monotonously decreases with respect to the output current, and the control means is configured so that the voltage levels of the direct current power output from the plurality of distributed power supplies match each other. 3. The direct current distribution system according to claim 1, wherein the direct current / direct current conversion means is controlled.

Images