WO2020137348A1

WO2020137348A1 - Dc power supply device and dc power system

Info

Publication number: WO2020137348A1
Application number: PCT/JP2019/046685
Authority: WO
Inventors: 實村野; 真棚橋; 伸一尾崎; 幸伸高橋
Original assignee: シオン電機株式会社
Priority date: 2018-12-29
Filing date: 2019-11-29
Publication date: 2020-07-02
Also published as: JPWO2020137348A1

Abstract

The purpose of the present invention is to be able to meet a variety of user needs and to suppress an increase in expense and cost of design and production. Provided is a DC power supply device having: a DC reception end which receives DC electric power; a DC output end which outputs the DC electric power; a power storage part connection end which connects to a power storage part storing the DC electric power; a first path which electrically connects the power storage part connection end and the DC reception end; a second path which electrically connects the power storage part connection end and the DC output end; and, a third path which electrically connects the DC reception end and the DC output end, wherein the first path has a first switch which cuts off said first path, the second path has a second switch which cuts off said second path, and the third path has a third diode which is connected in a forward direction to a supply of power from the DC reception end to the DC output end.

Description

DC power supply device and DC power system

The present invention relates to a DC power supply device and a DC power system.

For example, Patent Document 1 discloses a DC power source utilization system for the purpose of reducing installation cost, stable power supply to a DC load, and improvement of power supply capacity. The DC power supply system is a DC power supply that receives DC power from both a DC power supply, an AC commercial power supply, a DC converter that converts the AC commercial power supply into a DC power supply, and a DC power supply and a commercial power supply converted into DC. The loader is equipped with a backflow prevention diode between the DC power supply and the DC loader and between the DC converter and the DC loader, and the DC power supply side preferentially supplies power to the DC loader. A power supply priority supply device for supplying power is attached. According to the DC power supply system, even if the solar power is included in the DC power supply, even if the amount of solar radiation is reduced, it is possible to provide a simple control method capable of maximally utilizing the electric power generated at the amount of solar radiation.

For example, Patent Document 2 discloses a power transmission system for selecting a desired power source and aiming for efficient use corresponding to the type of the selected power source. The power transmission system has a plurality of DC power supplies and a load that receives the supply of DC power, and the DC power supply is equipped with a power priority extraction device, and is controlled by a controller. It is characterized in that the power amount for preferential power extraction from the power source to the load is determined. According to the power transmission system, when synthesizing the power groups generated from each natural energy as well as the commercial power source, a small amount of power generated from a small amount of natural energy can be effectively used without being wasted, and Multiple power sources can be used in combination, and even if one power source is cut off, power can be automatically supplied from other power sources, and when multiple power sources are used, the priority of use can be easily set. It is said that.

For example, Patent Document 3 discloses a photovoltaic power supply system for the purpose of maximizing the generated power of the solar cell when the power consumption of the load exceeds the power supplied from the solar cell. The solar power generation power supply system includes a solar power supply device, a power supply device other than the solar power supply device, a power combining device that combines the power from the power supply devices, and the power combined by the power combining device. With a load to be input, the power consumption of the load, in a condition that is substantially equal to or greater than the power generated by the solar power supply device, detects a voltage value at which the power of maximum efficiency can be obtained from the solar power supply device, Set the voltage value of the power supply device other than the solar power supply device as a voltage value that is approximately equal to the detected voltage value, combine the power from multiple power supply devices with the power combiner, and supply the combined power to the load. Have a configuration.

JP, 2011-181055, A Japanese Patent Laid-Open No. 2014-121241 JP, 2016-019415, A

As described above, in a system that combines direct current power from multiple power sources and supplies it to the load, the output current fluctuates according to the output voltage, that is, the power that can be extracted fluctuates according to the output voltage, such as a solar cell. In general, when a power source that includes a power source is included, an MPPT (Maximum Power Point Tracking) type control device that automatically obtains an optimum current-voltage that maximizes the output is used.

However, the MPPT controller itself can cause power loss. In addition, the MPPT control device adopts the Hill Climbing Method as a control method and uses a DC-DC converter, which inevitably causes pulse-shaped or sawtooth-shaped voltage fluctuations, and these voltage fluctuations occur in the storage battery. There is a problem that can be a factor that deteriorates.

Therefore, for the purpose of solving the above-mentioned problems, the present inventors appropriately maintain or control the output even when including a power source such as a solar cell in which the optimum output voltage fluctuates, and as a whole, Invented a power supply system that can improve the power generation efficiency of, and applied for a patent for this (Japanese Patent Application No. 2017-169034).

According to the power supply system described above, it is possible to increase the power generation efficiency of the entire system, but if the power generation capacity becomes large, it is unavoidable to use expensive parts for high power as the parts to be used, which reduces the cost. There was concern that it would rise. Further, in order to finely correspond to the required power amount that differs for each user, it is necessary to prepare a wide variety of power combining devices and the like used in the power supply system, which may increase the load of designing and manufacturing.

An object of the present invention is to provide a DC power supply device and a DC power system capable of meeting various user needs and suppressing the burden of design/manufacturing and an increase in cost.

In order to solve the above problems, in a first aspect of the present invention, a DC power receiving end for receiving DC power, a DC output end for outputting DC power, and a power storage unit connected to a power storage unit for storing DC power. A part connection end, a first path electrically connecting the power storage part connection end and the DC power reception end, a second path electrically connecting the power storage part connection end and the DC output end, and A third path electrically connecting the direct current power receiving end and the direct current output end, the first path having a first switch that shuts off the first path, and the second path; A first configuration having a second switch for shutting off the second path, wherein the third path has a third diode forward-connected to the power supply from the DC power receiving end to the DC output end; Alternatively, there is provided a DC power supply device having any one of a second configuration in which the DC power receiving end and the DC output end are directly connected.

In the above-described DC power supply device, the first path further includes a first diode connected in series to the first switch and connected in a forward direction with respect to power supply from the DC power receiving end to the power storage unit connecting end. However, the second path may further include a second diode connected in series to the second switch and connected in a forward direction with respect to power supply from the power storage unit connection end to the DC output end. You may further have the control part which controls the said 1st switch and said 2nd switch.

The first path further has a first bypass in which a third switch and a resistance element are connected in series, and the second path further has a second bypass in which a fourth switch and a resistance element are connected in series, The first switch and the first bypass may be connected in parallel, and the second switch and the second bypass may be connected in parallel. In this case, you may further have the control part which controls the said 1st switch, the said 2nd switch, the said 3rd switch, and the said 4th switch.

In a second aspect of the present invention, a DC power receiving end that receives DC power, a DC output end that outputs DC power, a power storage unit connection end connected to a power storage unit that stores DC power, and the power storage unit. A fourth path electrically connecting the connection end to the DC power receiving end and the DC output end; and a third path electrically connecting the DC power receiving end to the DC output end, The fourth path has a fifth switch that shuts off the fourth path, and the third path has a third diode forwardly connected to the power supply from the DC power receiving end to the DC output end. There is provided a DC power supply device having either a first configuration or a second configuration in which the DC power receiving end and the DC output end are directly connected. In this case, you may further have the control part which controls the said 5th switch.

The DC power supply device of the first and second aspects described above may further include a rectifying unit that rectifies AC power into DC, and the DC output of the rectifying unit may be directly connected to the DC output terminal. Moreover, you may further have a power storage part connected to the said power storage part connection end.

In a third aspect of the present invention, there is provided a DC power system using the above DC power supply device, comprising a plurality of the DC power supply devices, and a power storage unit connected to the power storage unit connection end of the DC power supply device. A single or a plurality of power generators that output DC power, and an input connection unit that inputs the DC power from the power generators to the DC power supply device, wherein the input connection unit is a single or a plurality. A DC power system capable of arbitrarily connecting an output end of any power generator of the power generators and a DC power receiver of any DC power feeder of the plurality of DC power feeders. provide.

The input connection unit may be composed of a switch matrix. A storage voltage control device that monitors the storage voltage of the power storage unit and controls the connection state of the input connection unit may be further included. Further, in the above DC power system, further having an output connection unit for outputting DC power to a single or a plurality of loads, the output connection unit is a DC of any DC power supply device of the plurality of DC power supply devices. The output terminal and the input terminal of an arbitrary load of the single or the plurality of loads may be arbitrarily connectable.

In a fourth aspect of the present invention, there is provided a DC power system using the above DC power supply device, wherein a plurality of the DC power supply devices and a power storage unit connected to the power storage unit connection end of the DC power supply device are provided. A single or a plurality of power generators that output DC power, and an output connection unit that outputs DC power to a single or a plurality of loads, wherein the output connection unit is a plurality of the DC power supply devices. There is provided a DC power system capable of arbitrarily connecting a DC output end of an arbitrary DC power supply device and an input end of an arbitrary load of a single load or a plurality of loads. In this case, the output connection unit may include a switch matrix, and may further include an output control device that controls an on/off state of each switch in the switch matrix.

The above summary of the invention does not enumerate all necessary features of the invention. Further, a sub-combination of these feature groups can also be an invention.

FIG. 3 is a functional block diagram showing a DC power system 100. It is a circuit block diagram which shows an example of the direct current storage power supply part 110. 6 is a circuit diagram showing an example of an input connection section 160 (output connection section 170). FIG. 3 is a circuit block diagram showing an example of a DC storage power supply unit 210. FIG. FIG. 6 is a circuit block diagram showing an example of a DC storage power supply unit 310. It is a circuit block diagram which shows an example of the direct current storage power supply part 315. FIG. 3 is a functional block diagram showing a DC power system 400. FIG. 6 is a partial circuit diagram showing another example of the DC power supply circuit 120.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all of the combinations of features described in the embodiments are essential to the solving means of the invention.

(Embodiment 1)
FIG. 1 is a functional block diagram showing a DC power system 100. The DC power system 100 includes a plurality of DC power storage/supply sections 110, an input connection section 160, a single or a plurality of power generators 165, a commercial power source 166, an output connection section 170, and a load 175. It has a DC power supply circuit 120, a power storage unit 140, and a rectification unit 150. The commercial power source 166, the rectifying unit 150, and the load 175 do not necessarily constitute the DC power system 100.

The DC power storage/supply unit 110 stores the DC power received from the power generation device 165 via the input connection unit 160 in the power storage unit 140 or rectifies the AC power received from the commercial power source 166 by the rectification unit 150. The DC power from the power generation device 165, the DC power obtained by rectifying the AC power from the commercial power supply 166, or the DC power stored in the power storage unit 140 is stored in the power storage unit 140 and is supplied to the load 175 via the output connection unit 170. It has the function of supplying power.

The DC power system 100 according to the present embodiment includes a plurality of DC storage and power supply units 110, so that it is possible to finely respond to various user needs and reduce costs. That is, the electric power required by each user varies, and it is necessary to individually design and construct the system for each user in order to fully meet the individual needs. If such measures are taken, the burden of designing and construction is heavy, and it is difficult to reduce the man-hours, so that the cost may increase. Further, when the amount of electric power required by the customer is large, it is necessary to use expensive parts for large electric power, which may increase the cost.

However, since the DC power supply system 100 of the present embodiment includes the plurality of DC power storage/supply units 110, some standard products having a relatively small power capacity are prepared as the DC power storage/power supply unit 110 (for example, 5 kW, 10 kW, 30 kW). , Etc.), by combining these standard products, it is possible to finely correspond to the power capacity required by the customer. Further, since it is a standard product, there is no need to newly design and construct it for each customer, and the cost can be kept low. By using a standard product prepared in advance as the DC power storage/supply unit 110 with a relatively small power capacity, inexpensive power-saving components can be used, and the product cost can be suppressed. Further, even if the customer who is operating the system makes a request to increase or decrease the power capacity, by changing the combination of the DC storage and power feeding units 110, it becomes possible to easily meet such a request. ..

FIG. 2 is a circuit block diagram showing an example of the direct current storage/power supply unit 110. The DC power storage/supply unit 110 includes a DC power supply circuit 120, DC power receiving ends 122-1 and 122-2, DC output ends 124-1 and 124-2, rectifying unit connecting ends 126-1 and 126-2, and a power storing unit connecting end. 128-1 and 128-2, a control unit 130, a power storage unit 140, a rectifying unit 150, and rectifying unit power receiving ends 152 and 154. Note that the rectifying unit 150 and the rectifying unit power receiving ends 152 and 154 are not indispensable constituent features of the DC storage power feeding unit 110.

The DC power supply circuit 120 includes DC power receiving terminals 122-1 and 122-2, DC output terminals 124-1 and 124-2, rectifying unit connecting terminals 126-1 and 126-2, and power storage unit connecting terminals 128-1 and 128-. It is an electric circuit that connects the two and has a first path 134, a second path 136, and a third path 138.

The first path 134 electrically connects the power storage unit connection end 128-1 and the DC power reception end 122-1. The second path 136 connects the power storage unit connection end 128-1 and the DC output end 124-1. The third path 138 is electrically connected to electrically connect the DC power receiving end 122-1 and the DC output end 124-1.

The first path 134 has a first switch SW1 and a first diode D1. The first switch SW1 shuts off the first path 134. The first diode D1 is connected in series to the first switch SW1 and is connected in the forward direction with respect to the power supply from the DC power receiving end 122-1 to the power storage unit connecting end 128-1.

The second path 136 has a second switch SW2 and a second diode D2. The second switch SW2 shuts off the second path 136. The second diode D2 is connected in series to the second switch SW2, and is connected in the forward direction with respect to the power supply from the power storage unit connection end 128-1 to the DC output end 124-1.

The third path 138 has a third diode D3. The third diode D3 is forwardly connected to the power supply from the DC power receiving end 122-1 to the DC output end 124-1.

The DC power receiving ends 122-1 and 122-2 receive DC power, and the DC output ends 124-1 and 124-2 output DC power. Rectification unit connection ends 126-1 and 126-2 are connected to rectification unit 150, and power storage unit connection ends 128-1 and 128-2 are connected to power storage unit 140. The control unit 130 controls the first switch SW1 and the second switch SW2.

The power storage unit 140 is an electric device capable of storing DC power, and examples thereof include a storage battery and a capacitor. Power storage unit 140 may be configured by a single storage battery or a plurality of storage batteries. The voltage of the power storage unit 140 can be adjusted by combining and connecting a plurality of storage batteries and the like in series and parallel.

The rectifying unit 150 rectifies AC power into DC. The DC output of the rectifying unit 150 is directly connected to the DC output terminals 124-1 and 124-2. The rectifier power receiving ends 152 and 154 receive the AC power from the commercial power source 166.

The input connection unit 160 receives the DC power from the power generator 165. The input connection section 160 includes an output terminal of an arbitrary power generating apparatus 165 of the single or a plurality of power generating apparatuses 165, a DC power receiving terminal 122-1 of an arbitrary DC storage power feeding section 110 of the plurality of DC power storage feeding sections 110, 122-2 is an electric circuit that can be arbitrarily connected to the unit 122-2. The input connection section 160 may be composed of a switch matrix as shown in FIG. 3, for example.

FIG. 3 is a circuit diagram showing an example of the input connection section 160. The input connection section 160 shown in FIG. 3 has a plurality of input terminals 162 and a plurality of output terminals 164. The switches connected to the input terminals 162 and the output terminals 164 are arranged in a matrix. SW11 to SW33 are connected. The input end 162 is arranged on the power generation device 165 side, and the output end 164 is arranged on the DC storage power feeding unit 110 side. By controlling the opening and closing of the switches SW11 to SW33, it is possible to connect the arbitrary input terminal 162 and the arbitrary output terminal 164, and it is possible to connect the arbitrary power generation device 165 to the arbitrary DC storage power supply unit 110. become.

By including the input connection unit 160, the connection between the power generation device 165 and the DC power storage and supply unit 110 is optimally controlled while monitoring the amount of power generation in each power generation device 165 and the amount of power stored in the power storage unit 140 in each DC power storage and power supply unit 110. can do.

The power generation device 165 is an electric device that outputs DC power, and examples thereof include a solar cell and a fuel cell. The power generator 165 is preferably renewable energy. Although a plurality of power generators 165 are illustrated in FIG. 1, the power generator 165 may be a single power generator 165.

The commercial power source 166 is an AC power source supplied from a power company or the like via a power transmission line. In addition, since the DC power system 100 of the present embodiment tries to cover the power supply to the load 175 with natural energy typified by a solar cell or the like as much as possible, the power from the commercial power supply 166 is It is auxiliary power used only when the power from the power generation device 165 is insufficient. Therefore, when the power from the power generation device 165 sufficiently supplies the power to the load 175, the commercial power source 166 and the rectifying unit 150 associated therewith are unnecessary and are not essential components.

The output connection unit 170 supplies DC power to the single or multiple loads 175. The output connection unit 170 inputs the DC output terminals 124-1 and 124-2 of any DC storage power supply unit 110 among the plurality of DC storage power supply units 110 and any load 175 of the single or multiple loads 175. It is an electric circuit that can be arbitrarily connected to the ends. The output connection section 170 may be configured by a switch matrix as shown in FIG. 3, for example. In addition, although the single load 175 is illustrated in FIG. 1, the load 175 may be plural.

Similar to the description of FIG. 3 described above, the output connection unit 170 has a plurality of input ends 172 and a plurality of output ends 174, and each input line 172 and each wiring connected to the output end 174 are arranged in a matrix. The arranged switches SW11 to SW33 are connected. The input end 172 is arranged on the side of the DC storage power supply unit 110, and the output end 174 is arranged on the side of the load 175. By controlling the opening and closing of the switches SW11 to SW33, it is possible to connect the arbitrary input terminal 172 and the arbitrary output terminal 174, and it is possible to connect the arbitrary DC storage power feeding unit 110 to the arbitrary load 175. Become.

By providing the output connection unit 170, the balance between the amount of power from the power generation device 165 supplied to each DC power storage unit 110 and the amount of power stored in the power storage unit 140 and the required amount of power of the load 175 is considered. However, it is possible to optimally control the connection between the DC power storage/supply unit 110 and the load 175.

The load 175 is an electric/electronic device that consumes DC power. For example, an inverter type air conditioner having a DC input, a lighting device such as an LED capable of being driven by DC, and an electronic device such as a computer having a DC input can be exemplified.

Next, operations of the first switch SW1 and the second switch SW2 in the DC power supply circuit 120 will be described. The first switch SW1 and the second switch SW2 are controlled by the control unit 130 with reference to the voltage (V_BATT) of the power storage unit 140. The following four voltages are defined according to the characteristics of power storage unit 140.
"Charging prohibition voltage (V_CRGOFF)": When this voltage is exceeded, it is considered to be fully charged and charging is prohibited.
"Charging permission voltage (V_CRGON)": When the voltage drops below this voltage, charging is possible.
"Discharge permission voltage (V_DISON)": When the voltage exceeds this voltage, discharge is possible.
"Discharge inhibit voltage (V_DISOFF)": When the voltage drops below this voltage, it is considered that the battery level is empty, and discharge is prohibited.

The specific control method is as follows.
1. V_CRGOFF and V_BATT are compared, and if “V_CRGOFF<V_BATT”, the first switch SW1 is turned off.
2. V_CRGON and V_BATT are compared, and when “V_CRGON>V_BATT”, the first switch SW1 is turned on.
3. V_DISON is compared with V_BATT, and when “V_DISON<V_BATT”, the second switch SW2 is turned on.
4. V_DISOFF and V_BATT are compared, and when “V_DISOFF>V_BATT”, the second switch SW2 is turned off.

According to the DC power system 100 described above, the DC storage and power supply unit 110 can be increased or decreased according to the user's request, so that it is possible to respond to the user's request in detail while suppressing the cost. Further, by making the DC power storage/feeding unit 110 compatible with a relatively small power capacity, cost reduction can be achieved.

In the above-described DC power system 100, the first diode D1, the second diode D2, and the third diode D3 are provided in each of the first path 134, the second path 136, and the third path 138 of the DC power supply circuit 120, so that the power storage is performed. Cascade connection of two or more DC storage/feeding units 110 (DC receiving ends 122-1 and 122-2 of one DC storage/feeding unit 110, DC output ends without worrying about the amount of stored electricity (output voltage) of the unit 140) 124-1 and 124-2 can be connected to the DC power receiving ends 122-1 and 122-2 and the DC output ends 124-1 and 124-2 of the other DC storage power feeding unit 110). it can. That is, when two DC power storage/supply units 110 having different voltages in power storage unit 140 are cascade-connected in a discharge enabled state, one power storage unit 140 is connected to the other via the DC output terminals 124-1 and 124-2 of the two. A current is about to flow in power storage unit 140. However, the inflow current is blocked by the action (reverse bias) of second diode D2 and third diode D3 on the side where the current flows, and as a result, the reverse current does not flow into power storage unit 140 and power generation device 165.

Further, in general, a single DC storage power supply unit 110 can be connected to a single or a plurality of power generation devices 165, and a single power generation device 165 cannot be connected to a plurality of DC storage power supply units 110. In the DC power system 100 according to the embodiment, the DC power supply circuit 120 includes the first diode D1, the second diode D2, and the third diode D3. Therefore, the single power generation device 165 is connected to the plurality of DC storage power supply units 110. It will be possible. That is, when the single power generation device 165 is connected to the plurality of DC storage power supply units 110 connected in cascade, the first diode D1 becomes a forward bias in the charging enabled state, and the power storage unit 140 having a low voltage is preferentially started. Charging is executed. As a result, it is possible to reduce the bias of charging in the plurality of DC storage power supply units 110.

(Embodiment 2)
In the DC power system 100 according to the first embodiment, each of the first path 134, the second path 136, and the third path 138 of the DC power supply circuit 120 includes a first diode D1, a second diode D2, and a third diode D3. Although the example described above is shown, when the charging voltage at the time of connecting the DC storage power supply unit 110 is the same, the third diode D3 of the third path 138 can be omitted as shown in FIG. That is, the third path 138 can be configured such that the DC power receiving end 122 and the DC output end 126 are directly connected.

The control of the first switch SW1 and the second switch SW2 in the control unit 130 in this case can be performed as follows, as in the case of the first embodiment.
1. V_CRGOFF and V_BATT are compared, and if “V_CRGOFF<V_BATT”, the first switch SW1 is turned off.
2. V_CRGON and V_BATT are compared, and when “V_CRGON>V_BATT”, the first switch SW1 is turned on.
3. V_DISON is compared with V_BATT, and when “V_DISON<V_BATT”, the second switch SW2 is turned on.
4. V_DISOFF and V_BATT are compared, and when “V_DISOFF>V_BATT”, the second switch SW2 is turned off.

(Embodiment 3)
The first diode D1 and the second diode D2 described in the first embodiment are elements for preventing backflow, and the first diode D1 and the second diode D2 can be replaced with switches. When the backflow prevention function can be realized by controlling the first switch SW1 and the second switch SW2, the first diode D1 and the second diode D2 can be omitted as shown in FIG.

The control of the first switch SW1 and the second switch SW2 in the control unit 130 in this case can be performed as follows.
5. When the charging prohibition condition is met: The first switch SW1 is turned off.
6-1. When the charging permission condition is met and SW1 is off: When the voltage on the power storage unit side of SW1 is lower than the voltage on the DC output end side, the first switch SW1 is turned on.
6-2. When the charge permission condition is met and SW1 is on: When the current flowing through SW1 is flowing to the DC output end side, the first switch SW1 is turned off.
7. When the discharge prohibition condition is met: The second switch SW2 is turned off.
8-1. When the discharge permission condition is met and SW2 is off: When the voltage on the power storage unit side of SW2 is higher than the voltage on the DC output end side, the second switch SW2 is turned on.
8-2. When the discharge permission condition is satisfied and SW2 is on: When the current flowing through SW2 is flowing to the power storage unit side, the second switch SW2 is turned off.

(Embodiment 4)
Similarly to the third embodiment, the first diode D1 and the second diode D2 described in the second embodiment may be omitted if the backflow prevention function can be realized by the control of the first switch SW1 and the second switch SW2. it can. In this case, since the first switch SW1 and the second switch SW2 are connected in parallel, they can be replaced with a single fifth switch SW5 as shown in FIG. That is, the fourth path 139 electrically connecting the power storage unit connection end 128-1, the DC power reception end 122-1 and the DC output end 124-1 and the third path 138 are provided, and the fourth path 139 may have a fifth switch SW5 that shuts it off, and the third path 138 may be a direct connection between the DC power receiving end 122-1 and the DC output end 124-1.

The fifth switch SW5 can be controlled by the control unit 130. For example, in the operation of the first switch SW1 and the second switch SW2, SW5 is turned off when both switches are turned off. SW5 may be controlled to be turned on under the condition that one of the switches is turned on.

(Embodiment 5)
In addition to the configuration of the first embodiment, as shown in FIG. 7, the configurations of the accumulated voltage control device 402 and the output control device 404 can be added. That is, the stored voltage control device 402 monitors the stored voltage in the power storage unit 140 included in each of the plurality of DC storage power supply units 110, and controls the connection state in the input connection unit 160. With the configuration, charging can be preferentially performed from the power storage unit 140 having a low stored voltage. Further, at this time, the power generation device 165 having a large generated power can be selected and used for the charging.

Further, the output control device 404 controls ON/OFF of each switch of the switch matrix in the output connection section 170. With this configuration, when there are a plurality of loads 175, the load 175 to be prioritized can be selected and power can be supplied. Further, it is possible to select the power storage unit 140 having a high stored voltage, preferentially supply power to the load 175, and level the stored voltage among the DC storage power supply units 110.

(Embodiment 6)
When a switch relay or the like is used as the first switch SW1 and the second switch SW2 in the first to fourth embodiments and the fifth switch SW5 in the fifth embodiment, the purpose is to fuse the relay contacts and prevent arc discharge during cutting. A precharge circuit as shown in FIG. 8 can be added. That is, the first path 134 further has the first bypass 502 in which the third switch SW3 and the resistance element R are connected in series, and the second path 136 is the first bypass 502 in which the fourth switch SW4 and the resistance element R are connected in series. The second switch 504 may further include two bypasses 504, the first switch SW1 and the first bypass 502 may be connected in parallel, and the second switch SW2 and the second bypass 504 may be connected in parallel. In this case, the control unit 130 can control the first switch SW1, the second switch SW2, the third switch SW3 and the fourth switch SW4, or the fifth switch SW5, the third switch SW3 and the fourth switch SW4. ..

The control of each switch of the first switch SW1 to the fifth switch SW5 in the present embodiment can be performed as follows, for example. That is, when SW1 is turned on, the third switch SW3 is turned on, and then SW1 is turned on. To turn off SW1, turn off SW1 and then turn off SW3. The same applies to SW2 and SW4. The same applies to SW5. With this configuration, it is possible to prevent the arc discharge when the relay contacts are fused and cut.

The present invention has been described above using the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It is apparent to those skilled in the art that various changes or improvements can be added to the above-described embodiment. It is apparent from the description of the scope of claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

For example, in the above-described DC power system 100, an example in which both the input connection section 160 and the output connection section 170 are provided has been described, but it may be provided with either one or without both. In this case, the DC power receiving ends 122-1 and 122-2 or the DC output ends 124-1 and 124-2, which do not include the input connecting part 160 or the output connecting part 170, are cascaded with the same part of the other DC storage power feeding part 110. It may be connected or may be arbitrarily connected.

Also, in the above-described embodiment, the output of the power generation device 165 may be provided with a DC-DC converter or an MPPT control device.

100... DC power system, 110... DC storage/feeding unit, 120... DC feeding circuit, 122-1 and 122-2... DC receiving end, 124-1, 124-2... DC output end, 126-1, 126-2 ... Rectifier connection ends, 128-1, 128-2... Power storage connection ends, 130... Control part, 134... First path, 136... Second path, 138... Third path, 139... Fourth path, 140... Power storage unit, 150... Rectification unit, 152, 154... Rectification unit power receiving end, 160... Input connection unit, 162... Input end, 164... Output end, 165... Power generation device, 166... Commercial power supply, 170... Output connection unit, 172 ... Input end, 174... Output end, 175... Load, 210... DC storage power supply unit, 310... DC storage power supply unit, 315... DC storage power supply unit, 400... DC power system, 402... Storage voltage control device, 404... Output Control device, 502... First bypass, 504... Second bypass, D1... First diode, D2... Second diode, D3... Third diode, R... Resistance element, SW1... First switch, SW2... Second switch, SW3... Third switch, SW4... Fourth switch, SW5... Fifth switch, SW11 to SW33... Switch.

Claims

A DC power receiving end that receives DC power,
A DC output end that outputs DC power,
A power storage unit connection end connected to a power storage unit that stores DC power,
A first path electrically connecting the power storage unit connection end and the DC power reception end;
A second path electrically connecting the power storage unit connection end and the DC output end;
A third path electrically connecting the DC power receiving end and the DC output end,
The first path has a first switch that shuts off the first path,
The second path has a second switch that shuts off the second path,
A first configuration in which the third path has a third diode forwardly connected to the power supply from the DC power receiving end to the DC output end, or between the DC power receiving end and the DC output end The DC power supply device having any one of the second configuration in which is directly connected.
The first path further includes a first diode connected in series to the first switch and connected in a forward direction with respect to power supply from the DC power receiving end to the power storage unit connecting end,
The direct current according to claim 1, wherein the second path further includes a second diode connected in series to the second switch and connected in a forward direction with respect to power supply from the power storage unit connection end to the direct current output end. Power supply device.
The DC power supply device according to claim 1 or 2, further comprising a control unit that controls the first switch and the second switch.
The first path further has a first bypass in which a third switch and a resistance element are connected in series,
The second path further has a second bypass in which a fourth switch and a resistance element are connected in series,
The first switch and the first bypass are connected in parallel,
The DC power supply device according to any one of claims 1 to 3, wherein the second switch and the second bypass are connected in parallel.
The DC power supply device according to claim 4, further comprising a control unit that controls the first switch, the second switch, the third switch, and the fourth switch.
A DC power receiving end that receives DC power,
A DC output end that outputs DC power,
A power storage unit connection end connected to a power storage unit that stores DC power,
A fourth path electrically connecting the power storage unit connection end to the DC power reception end and the DC output end;
A third path electrically connecting the DC power receiving end and the DC output end,
The fourth path has a fifth switch that shuts off the fourth path,
A DC power supply device in which the third path is directly connected between the DC power receiving end and the DC output end.
The DC power supply device according to claim 6, further comprising a control unit that controls the fifth switch.
Further having a rectifying unit for rectifying AC power into DC,
The DC power supply device according to claim 1, wherein a DC output of the rectifying unit is directly connected to the DC output terminal.
The DC power supply device according to claim 1, further comprising a power storage unit connected to the power storage unit connection end.
A DC power system using the DC power supply device according to claim 1.
A plurality of the DC power supply devices,
A power storage unit connected to the power storage unit connection end of the DC power supply device,
A single or a plurality of generators that output DC power;
An input connection unit for inputting DC power from the power generation device to the DC power supply device,
The input connection section arbitrarily connects an output end of any power generation device of the single or a plurality of the power generation devices and a DC power reception end of any DC power supply device of the plurality of DC power supply devices. DC power system that is capable of.
The DC power system according to claim 10, wherein the input connection unit is composed of a switch matrix.
The DC power system according to claim 10 or 11, further comprising a storage voltage control device that monitors a storage voltage of the power storage unit and controls a connection state of the input connection unit.
The DC power system according to any one of claims 10 to 12,
Further having an output connection for outputting DC power to a single or multiple loads,
The output connection unit can arbitrarily connect a DC output terminal of an arbitrary DC power feeding apparatus of the plurality of DC power feeding apparatuses and an input terminal of an arbitrary load of the single or the plurality of loads. A direct current power system.
A DC power system using the DC power supply device according to claim 1.
A plurality of the DC power supply devices,
A power storage unit connected to the power storage unit connection end of the DC power supply device,
A single or a plurality of generators that output DC power;
An output connection that outputs DC power to a single or multiple loads,
The output connection unit can arbitrarily connect a DC output terminal of an arbitrary DC power feeding apparatus of the plurality of DC power feeding apparatuses and an input terminal of an arbitrary load of the single or the plurality of loads. A direct current power system.
The output connection is composed of a switch matrix,
The DC power system according to claim 14, further comprising an output control device that controls an on/off state of each switch in the switch matrix.