JP5070882B2 - Power supply system and power supply method - Google Patents

Description

  The present invention relates to a power supply system and a power supply method, and more particularly to a power supply system and a power supply system that can effectively use power generated by a power generation unit.

  Conventional power supply systems are disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2006-179605 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2006-149037 (Patent Document 2). Patent Document 1 discloses that a plurality of solar cell modules installed on a mobile cover such as a sedimentation basin in a water and sewage treatment facility are connected in series to generate a predetermined capacity, and the solar cell array generates power. In a photovoltaic power generation facility comprising a cable for transmitting the direct-current power, a direct-current power system having a direct-current power transmission line, and an inverter for converting direct-current power from the direct-current power system into alternating-current power, a plurality of solar cell arrays A connector and disconnector that selectively disconnects from a DC power system is disclosed. In this publication, it is considered to sell surplus power to a commercial system.

On the other hand, according to Patent Document 2, a power is provided between a bidirectional power converter that functions as a converter when charging a storage battery and as an inverter when discharged, and between commercial power, the bidirectional power converter, and a load. A power selection means for selecting the power supply, a control means for controlling the power selection means, and a solar power generation device, charging the storage battery from commercial power and supplying power to the load during the night charge application time zone , Daytime, the power is supplied only from the storage battery according to the power consumption of the load and the surplus power of the photovoltaic power generator is reversely flowed to the commercial power side, and when the power consumption of the load is a predetermined value or more, The electric power storage system which supplies electric power from a storage battery to the value and supplies the electric power from a commercial power source or a solar power generation device is disclosed.
JP 2006-179605 A (summary) JP 2006-149037 A (summary)

  The conventional power supply system is configured as described above. In Patent Documents 1 and 2, surplus power is reversely flowed to the commercial power side to perform power interchange. However, in such a method, power transmission causes power loss to power transmission, There has been a problem that the power of the device through which power is transmitted is also required.

  The present invention has been made paying attention to the above-described problems, and a power supply system and a power supply method that can effectively use power generated by a power generation unit such as a solar power generation unit each having power generation capability. The purpose is to provide.

  The power supply system according to the present invention supplies power to a plurality of loads from a plurality of power generation units each having a power generation capability. The power supply system includes a power consumption detection unit that detects power consumption of each of a plurality of loads, and a power generation unit that supplies power corresponding to each load based on the power consumption detected by the power consumption detection unit. Including control means to be actuated.

  In order to detect the power consumption of each of the plurality of loads and operate the plurality of power generation units so as to supply the power corresponding to the respective loads according to the detected power consumption, surplus power is generated in each load. Therefore, the power generated by the power generation unit is not wasted.

  As a result, it is possible to provide a power supply system that can effectively use the power generated by the power generation unit.

  Preferably, the control unit includes a calculation unit that calculates a power consumption ratio of the plurality of loads detected by the power consumption detection unit, and controls the power generation unit so that the ratio calculated by the calculation unit is obtained.

  More preferably, it includes a plurality of power supply lines that supply power to any of the plurality of loads, and selectively connects the power generated by each of the plurality of power generation units to any of the plurality of power supply lines. The control means supplies power corresponding to the plurality of loads to the plurality of power generation units by switching the selection switch.

  In one embodiment of the present invention, the battery further includes a power storage device, and when the amount of power generated by the power generation unit exceeds the power consumption of the load, the control means converts the power generation amount exceeding the power consumption into the power storage device. To store electricity.

  In one embodiment of the present invention, the power generation unit is a solar power generation unit. The power generation unit may be a windmill for wind power generation or a cogeneration system (cogeneration system).

  In addition, the plurality of loads may include a power receiving device that receives an external commercial power source, or may include a power selling device that sells power to an external commercial power source.

  In another embodiment of the present invention, a plurality of power supply systems are provided, and the respective power supply systems are connected to each other.

  In another aspect of the present invention, the power supply method is a power supply method for supplying power to a plurality of loads from a plurality of power generation units each having a power generation capability. The power supply method includes a step of detecting power consumption of each of the plurality of loads, and a step of operating the power generation unit to supply power corresponding to each load based on the detected power consumption.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining a basic operation of a power supply system when a power supply system according to the present invention is configured using a photovoltaic power generation unit. Referring to FIG. 1, a power supply system 10 includes a plurality of photovoltaic power generation units 11a to 11d each having a power generation capability, and a plurality of loads A and B to which power is supplied from the photovoltaic power generation units 11a to 11d. And power supply lines 13a and 13b for supplying power to the loads A and B, and selector switches 12a to 12d for selecting which of the power supply lines 13a and 13b is supplied from the solar power generation units 11a to 11d, , A load detection device (power consumption detection means) 16 for detecting the power consumption of the plurality of loads A and B, and the changeover switches 12a to 12d according to the loads of the loads A and B detected by the load detection device 16 When the control unit (control means) 15 to be switched and the power generated by the solar power generation units 11a to 11d exceed the loads A and B, the surplus power is stored. And a capacitor 14 which operates as the power storage device. Here, the case where four photovoltaic power generation units 11 are provided and the number of loads is two will be described. As long as the load detection device 16 can detect the load, an arbitrary instrument such as a power integrator may be used. The control unit 15 has a CPU, and any device can be used as long as it can output signals for switching the changeover switches 12a to 12d in accordance with the load from the load detection device 16.

  FIG. 2 is a flowchart showing the operation of the control unit 15 in the power supply system shown in FIG.

  Referring to FIG. 2, control unit 15 detects whether or not a predetermined timing is reached (step S11, hereinafter, steps are omitted). Here, the predetermined timing may be a predetermined time at night when the solar power generation units 11a to 11d are not operating, for example. If it is determined that it is a predetermined timing, the load detection device 16 detects the loads of the plurality of loads A and B (S12), and calculates the load ratio.

  Next, according to the ratio of load, the photovoltaic power generation unit connected to load A and load B is determined (S13), and connection of changeover switch 12a-12d is switched so that it may be connected. For example, when the ratios of the loads A and B are equal, the changeover switches 12a to 12d are controlled so that the four photovoltaic power generation units 11a to 11d are assigned to the respective two loads. When it is determined that the load A is greater than B, the control unit 15 assigns four photovoltaic power generation units 11a to 11d to the load A and one to the load B. When it is determined that the load B is greater than A, four photovoltaic power generation units 11a to 11d are assigned to the load B and three to the load A.

  Note that even if the allocation is made in this way, the load and the supplied power do not always match, so if surplus power is generated, it is stored in the capacitor 14 or externally using a power selling device (not shown). You may make it sell electricity. In addition, a power receiving device (not shown) that receives commercial power from the outside may be provided for a case where the power generation capacity is insufficient.

  Here, “power sale” means that a general company having a power generation facility such as solar power generation or a general household sells surplus power to an electric power company.

  As described above, in the power supply system according to the present invention, power is supplied to a plurality of different loads from the plurality of power generation units 11a to 11d each having a power generation capability. The power supply system includes a power consumption detection device 16 that detects power consumption of each of a plurality of loads, and a power generation unit that supplies power corresponding to each load according to the power consumption detected by the load detection device 16 And a control unit 15 for operating 11a to 11d.

  In order to operate each of the plurality of power generation units 11a to 11d so as to detect the power consumption of each of the plurality of loads and supply the power corresponding to each load according to the detected power consumption, the surplus in each load No power is generated, and the power generated by the power generation units 11a to 11d is not wasted.

  As a result, it is possible to provide a power supply system that can effectively use the power generated by the power generation units 11a to 11d.

  In the above embodiment, the case where the predetermined timing for switching the changeover switch 12 is a specific time has been described. However, the present invention is not limited to this, and the load detection device 16 detects a change in the load, and the load ratio is determined. When changing, the change-over switch 12 may be automatically switched in real time.

  Next, a specific application example will be described. FIG. 3 is a block diagram showing the overall configuration of the power system when the power supply system according to one embodiment of the present invention is applied to a certain office, and FIG. 4 is a block diagram showing the overall configuration of the data system. It is. First, the power system will be described with reference to FIG. In the office 100, there are two buildings, ie, A building and B building, each of which has loads such as electric devices such as electric lights. Eight photovoltaic power generation units 20 each having an output of 12.5 kW are provided on the building A, and a total output of 100 kW is possible.

  Each building is provided with power clusters 22a and 22b for managing power consumption in the building. The power clusters 22a and 22b include power conditioners (Power Conditioners) 31a to 33a and 31b to 33b that convert DC power generated by the photovoltaic power generation unit 20 into AC power, and capacitors 35a and 35b that store surplus power. Monitoring. The power conditioners 31a to 33a and 31b to 33b are connected to loads 41a to 43b such as lighting fixtures and electric devices, and the respective loads are detected by the power clusters 22a and 22b.

  A changeover switch 21 that performs the same operation as the changeover switch 12 shown in FIG. 1 is provided between the photovoltaic power generation unit 20 and the power clusters 22a and 22b.

  Here, an external commercial power source is connected to the power cluster 22a. The power cluster 22a receives power supply from the commercial power source as necessary. In addition, power is transmitted between the power clusters 22a and 22b.

  Next, the data system will be described with reference to FIG. Power supply data and consumption data in the office 100 are monitored by a power monitoring server 23 that controls the entire power supply system. That is, devices such as the changeover switch 21, the power clusters 22a and 22b, and the power conditioners 31a to 33c for switching the solar power generation unit 20 are connected to the power monitoring server 23, and data from each of them is supplied to the power monitoring server 23. The

  The amount of power generated by the photovoltaic power generation unit 20 is calculated by the power clusters 22a and 22b from the current and voltage flowing through the power clusters 22a and 22b, and transmitted to the power monitoring server 23. In addition, the amount of power stored in the capacitors 35 a and 35 b is calculated from the voltage values measured by the power clusters 22 a and 22 b and transmitted to the power monitoring server 23.

  The power monitoring server 23 detects the load of each building detected by the power clusters 21a and 21b, calculates the power consumption ratio, and controls the changeover switch 21 so that the ratio is the same.

  In this embodiment, eight photovoltaic power generation units are provided. However, the number of photovoltaic power generation units is not limited to four or eight, but may be any number as long as it is two or more. The larger the number of photovoltaic power generation units, the more detailed control is possible.

  Next, a further specific example of the configuration of the data communication system of the power supply system shown in FIG. 4 will be described. FIG. 5 is a block diagram showing a configuration of a data system of the power supply system shown in FIG. Referring to FIG. 5, the power monitoring server 23 that controls the entire power supply system is also connected to a LAN 52 dedicated to the power monitoring system and an in-house LAN 51 connected to a web accessible to general employees and the like. ing. In this way, by connecting the power monitoring server 23, the power state can be viewed by any person in the office, and anyone can recognize the actual state of power supply.

  Next, another embodiment will be described. In the above embodiment, the case where a power supply system that supplies power from a photovoltaic power generation unit is applied as a power generation unit to a plurality of loads provided in a plurality of buildings in the same site has been described. The invention is not limited to this, and can also be applied to a case where power is supplied from a plurality of power generation units within a certain area to a plurality of loads. Such an example is shown in FIG.

  FIG. 6 is a block diagram in a case where a power supply system is provided in each of the three districts 60, 70, 80 so that power can be interchanged between the respective districts. For example, in the district 70, a plurality of photovoltaic power generation units 71, a wind turbine 72 for wind power generation, and a cogeneration power generation unit 73 are provided as power generation units, and these are consumed by a plurality of households 74 in the area as loads. It is a figure which shows the example of.

  The region 70 is provided with a power cluster 75 that monitors the power of the entire region. The power cluster 75 includes a plurality of solar power generation units 71, wind turbines 72 for wind power generation, and the amount of power generated from the cogeneration power generation unit 73. The home load 74 is detected, and each power generation unit 71, 72, 73 is controlled to match the load. The surplus power can be stored in the capacitor 76. In this case, the area may be a limited area with a municipality or the entire municipality.

  In the above embodiment, a solar power generation unit, a wind turbine for wind power generation, and a cogeneration power generation unit have been described as examples of the power generation unit. However, the present invention is not limited to this, and an arbitrary power generation unit may be used.

  Moreover, although the said embodiment demonstrated the case where the load was the office or the home, it is not restricted to this, Arbitrary power consumption facilities, such as a factory, may be sufficient.

  As described above, according to the present invention, it is possible to supply the amount of electric power according to the load, so that the maximum use of energy is possible. Moreover, when it restricts to natural energy, natural energy can be utilized maximum.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

It is a figure for demonstrating the basic operation | movement of this invention. It is a flowchart which shows operation | movement of the control part in an electric power supply system. It is a block diagram which shows the specific structural example of the electric power system at the time of applying one embodiment of this invention to a certain office. It is a block diagram which shows the specific structural example of the data system at the time of applying one embodiment of this invention to a certain office. FIG. 5 is a block diagram illustrating a configuration of a communication system in the data system of the power supply system illustrated in FIG. 4. It is a block diagram at the time of providing an electric power supply system in each of three districts, and enabling interchange of electric power between each district.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Power supply system, 11, 20 Photovoltaic power generation unit, 12, 21 selector switch, 13 Power supply line, 14 Capacitor, 15 Control part, 16 Load detection apparatus, 22 Power cluster, 23 Power monitoring server.

Claims (9)

A power supply system that supplies power to a plurality of loads from a plurality of power generation units each having a power generation capability,
The plurality of power generation units includes a plurality of different types of power generation units, including a plurality of solar power generation units ,
The power supply system includes:
Power consumption detection means for detecting the power consumption of each of the plurality of loads;
Control means for operating the power generation unit to supply power corresponding to the respective loads based on the power consumption detected by the power consumption detection means,
The control means includes
And a calculation unit that calculates a power consumption ratio of the plurality of loads detected by the power consumption detection unit, and assigns each of the same type of power generation unit to any of the plurality of loads according to the ratio calculated by the calculation unit. By controlling the power generation unit so that the calculated ratio,
A power supply system that supplies power corresponding to the plurality of loads by switching power supplied by the different types of power generation units. Including a plurality of power supply lines for supplying power to any of the plurality of loads,
A selection switch for selectively connecting the power generated by each of the plurality of power generation units to any of the plurality of power supply lines;
The power supply system according to claim 1, wherein the control unit supplies power corresponding to the plurality of loads to the plurality of power generation units by switching the selection switch. A power storage device,
3. The power storage device according to claim 1, wherein when the amount of power generated by the plurality of power generation units exceeds power consumption of the load, the control unit stores the amount of power generation exceeding the power consumption in the power storage device. The power supply system described. Wherein the plurality of power generating unit includes a windmill for wind power generation, the power supply system according to any one of claims 1 to 3. Wherein the plurality of power generating unit includes a cogeneration power generation unit, the power supply system according to any one of claims 1 to 3. Wherein the plurality of loads includes a power receiving apparatus for receiving a commercial power supply from the external power supply system according to any of claims 1 to 5. The power supply system according to any one of claims 1 to 6 , further comprising a power selling device for selling power to an external commercial power source. The power supply system according to any one of claims 1 to 7 , wherein a plurality of the power supply systems are provided, and the respective power supply systems are connected to each other. A power supply method for supplying power to a plurality of loads from a plurality of power generation units each having a power generation capability,
The plurality of power generation units includes a plurality of different types of power generation units, including a plurality of solar power generation units ,
The power supply method includes:
A detection step of detecting the respective power consumption of the plurality of loads,
Based on the detected power consumption, to supply a power corresponding to the respective load, and a working step of actuating the power generating unit,
The operation step includes
Calculating power consumption ratios of the plurality of loads detected in the detection step;
Allocating each of the same type of power generation unit to one of the plurality of loads according to the calculated ratio, and controlling the power generation unit to achieve the calculated ratio;
By switching the different types of power generating units supplying power by respectively, and supplying the power corresponding to the plurality of loads, the power supply method.

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