JP2021118639A - Micro-grid power system, control device, and micro-grid power control method - Google Patents

Abstract

To provide a micro-grid power system that does not require large capacity power conditioning facilities even when power is generated using renewable energy sources.SOLUTION: A micro-grid power system 100 includes a micro-grid power system 6A having a micro-grid power source 1, a system detector 3A that detects a frequency and a voltage of the micro-grid power system 6A, and a control unit 5 having a power supply control unit 4A that controls power supply from the micro-grid power source 1 to a load 19 according to a result of the system power detection of the system detector 3A.SELECTED DRAWING: Figure 1

Description

The present invention relates to a microgrid power system, a control device and a microgrid power control method.

Currently, a system that integrates power generation, substation, power transmission, and distribution to supply large power generated by a large power company at a large power plant to power receiving equipment on the demand side (factory, office, home, etc.) over a wide area. ) Is the mainstream of power systems. Such a commercial power system is excellent in that it can centrally produce a large amount of electric power and supply a large amount of electric power having excellent quality (stability such as frequency) over a wide area.
However, in recent years, the power transmission tower has collapsed due to a large earthquake, a large typhoon, etc., and the commercial power system has gone down.
In such a case, a small power generation facility (distributed power source) is installed near the consumer, for example, the power is normally supplied by the commercial power system, and if the commercial power system goes down, the distributed power source is used. If there is a small-scale power system (microgrid) in a specific area that uses the above, stable power supply will be possible even if the commercial power system goes down.

By the way, there is a method disclosed in Patent Document 1 as a method of stably supplying electric power by using a natural energy power source and a portable power source in the event of a disaster. In this method, in normal times, the renewable energy power source installed at the disaster prevention base is connected to the power system to supply power to the disaster prevention base, but in the event of a disaster, the wiring inside the disaster prevention base is separated from the power system and general load, and in the event of a disaster. Connect loads and portable power regulators. Then, the load (important load, load during a disaster) and the output of the natural energy power source with large output fluctuations are measured, and the storage battery of the power adjustment equipment installed at the disaster prevention base and the engine power generation with the ability to control the output according to the fluctuations. Balance load and power generation by controlling the machine.
This method is excellent in that the load can be balanced with the power generation using the natural energy power source at the disaster prevention base.

Japanese Unexamined Patent Publication No. 2008-245454

However, with this method, power adjustment equipment is required to balance power generation and load using a renewable energy power source with large output fluctuations, and power adjustment equipment that can always control output according to the load during power supply is available. There was a problem that it was indispensable and required a large-capacity power regulation facility.
The present invention has been made in view of such a problem, and is a microgrid power system, a control device, and a micro that do not require a large-capacity power adjustment facility even if power is generated using a renewable energy power source having a large output fluctuation. It is an object of the present invention to provide a grid power control method.

[1] The microgrid power system of the present invention is a microgrid power system including a microgrid power system having a microgrid power supply, the system detector for detecting the frequency and voltage of the microgrid power system, and the micro. It is further provided with a control device having a power supply control unit that controls the power supply supplied from the grid power supply to the load according to the system power detection result of the system detector.
Here, the "load" refers to a lamp, a television, an air conditioner, or the like that consumes electric power. "Accordingly" can also be paraphrased as "based on".

In this way, the system detector detects the frequency and voltage of the microgrid power system, and the power to the load is increased according to the balance between the supply power and the load power consumption output as the system power detection result. Since the supply is controlled, the power supply to the load is controlled according to the magnitude of the power supply of the microgrid power supply, not the power supply of the microgrid power supply is adjusted to the load power consumption. Therefore, for example, the supply power and the load power consumption can be balanced so that the load power consumption becomes excessive than the supply power, or vice versa, and the load power consumption becomes smaller than the supply power. It is possible to provide a microgrid power system that does not require a large-capacity power adjustment facility even if the power source uses a large renewable energy power source.

[2] In the microgrid power system of the present invention, the microgrid power system is directly or indirectly branched from the main distribution line to which the microgrid power supply is connected, and the load is connected. Further having a plurality of branch distribution lines to be connected and a branch switch for connecting and disconnecting the branch distribution line, the power supply control unit selectively selects the branch switch according to the system power detection result. It is preferable to control the power supply to the load by disconnecting the connection.
Here, the "branch distribution line indirectly branched from the main distribution line" is not limited to the re-branch distribution line that branches directly from the main distribution line, but the re-branch that branches from the re-branch distribution line. It also includes branch distribution lines that branch one after another, such as distribution lines and re-re-branch distribution lines that branch further. The branch distribution line to which the load is connected may be any of these branch distribution lines.
Further, "connection disconnection" means connecting or disconnecting.

In this way, the branch switch is selectively disconnected according to the system power detection result and the power supply to the load is controlled, so that the control is easy and the power generation using the natural energy power source is large. It becomes even easier to provide a microgrid power system that does not require capacity power conditioning equipment.

[3] In the microgrid power system of the present invention, it is preferable that the power supply control unit controls the power supply to the load (branch distribution line) by gradually disconnecting and disconnecting the branch switch. ..
Here, "stepwise" means that the connection is gradually cut off instead of abruptly cutting off the connection so as to cut off the connection of all the branch switches at once.

In this way, since the branch switch is gradually disconnected, it is easy to control, and a microgrid power system that does not require a large-capacity power adjustment facility even if power is generated using a natural energy power source is provided. It will be even easier to do.

[4] In the microgrid power system of the present invention, it is preferable that the power supply control unit connects and disconnects the branch switch according to the priority of the branch distribution line.
Here, the "priority" refers to the order in which the connection is cut off in order.

In this way, the branch switch is disconnected according to the priority of the branch distribution line. Therefore, by connecting an important electric device (load) such as a communication device to the branch distribution line having a high priority. , It is possible to use the electric power effectively even when the electric power supply amount becomes small.

[5] The microgrid power system of the present invention further includes a branch detector that detects power consumed via the branch distribution line, and the power supply control unit includes the system power detection result and the above. It is preferable to control the power supply to the load by disconnecting the branch switch according to the branch power consumption detected by the branch detector.

In this way, the connection of the branch switch is cut off according to the system power detection result and the branch power consumption (for example, excessive or too small) detected by the branch detector, and the power is supplied to the load (electrical equipment). Since it is controlled, it is possible to perform more accurate control, and it becomes easier to provide a microgrid power system that does not require a large-capacity power adjustment facility even if power is generated using a renewable energy power source.

[6] In the microgrid power system of the present invention, the power supply control unit uses the branch switch when the branch power consumption of the branch distribution line provided with the branch switch exceeds a certain magnitude. It is preferable to block.
Here, the "constant size" means, for example, the size of electric power set for each branch distribution line.

In this way, even after the branch switch is connected according to the system power detection result and the power supply to the load is appropriately controlled, for example, an unscheduled new load is connected. Large-capacity power adjustment equipment that does not require capacity for unplanned loads because the branch switch is cut off when the branch power consumption of the branch distribution line provided with the branch switch exceeds a certain size. It becomes even easier to provide a microgrid power system that does not require.

[7] In the microgrid power system of the present invention, when the power supply control unit starts (starts) or ends (ends) the power supply from the microgrid power supply to the load, the power supply control unit said. It is preferable to control the power supply to the load (distribution line) according to the system power detection result by gradually changing the magnitude of the power supply.

In this way, when the power supply of the microgrid power supply is started (at the start) or at the end (at the end), the magnitude of the supplied power is gradually changed, and the load (distribution line) is changed according to the system power detection result. ) Is gradually controlled, so there is no need for capacity to prepare for a sudden change in the size of the supplied power when the power supply is started (at the start) or at the end (at the end). It becomes even easier to provide a microgrid power system that does not require large capacity power conditioning equipment.

[8] In the microgrid power system of the present invention, the microgrid power source has a first power source using renewable energy that is easily affected by the natural environment and a second power source that is not easily affected by the natural environment. Is preferable.
Here, the "first power source using renewable energy that is easily affected by the natural environment" refers to a power source such as solar power generation or wind power generation that is easily affected by changes in the natural environment such as the weather. "Second power source that is not easily affected by the natural environment" includes, for example, storage batteries (including batteries installed in EV vehicles), small hydroelectric power generation, geothermal power generation, engine generator power generation using gasoline, etc. as fuel. Refers to the power supply.

In this way, the microgrid power supply is composed of a first power source that uses regenerated energy that is easily affected by the natural environment and a second power source that is not easily affected by the natural environment, and is easily affected by the natural environment. The frequency and voltage of the microgrid power system are detected by the first power source that uses energy, even when the power supply is likely to fluctuate, and the load (distribution line) is loaded according to the system power detection result. By controlling the power supply of the power supply, it becomes easier to provide a microgrid power system that does not require a large-capacity power regulation facility.

[9] In the microgrid power system of the present invention, the power supply control unit starts power supply by giving priority to (prioritizing) the second power supply among the first power supply and the second power supply. Is preferable.

In this way, of the first power source and the second power source, the second power source, which is less susceptible to the influence of the natural environment, is prioritized (priority) and the power supply is started. Therefore, the influence of the natural environment as a microgrid power source Unstable period when the magnitude of the supplied power at the start of power supply (when starting power supply) may fluctuate significantly even when using the first power source that uses regenerated energy that is susceptible to susceptibility. It becomes even easier to provide a microgrid power system that can be controlled stably and does not require unstable large-capacity power adjustment equipment.

[10] In the microgrid power system of the present invention, it is preferable that the power supply control unit stops the power supply from the second power supply when the power supply from the first power supply becomes larger than a certain level. ..
Here, "the power supply from the first power supply becomes a certain magnitude or more" means, for example, the magnitude of the power supply from the second power supply or more or more.

In this way, when the power supplied from the first power source using renewable energy, which is easily affected by the natural environment, exceeds a certain level, the power supply from the second power source, which is not easily affected by the natural environment, is stopped. Therefore, when the first power source can supply a certain amount of electric power or more, the first power source (renewable energy) can be effectively used. On the other hand, the second power source, which is not easily affected by the natural environment, can be preserved or charged.

[11] The control device of the present invention is the control device used for the microgrid power system according to any one of [1] to [10], and the power supply supplied from the microgrid power supply to the load is described. It is characterized by having the power supply control unit that controls according to the system power detection result of the system detector.

In this way, it is possible to provide a microgrid power system having the effect described in any one of the above [1] to [10].

[12] The microgrid power control method of the present invention is a microgrid power control method for supplying power from a microgrid power supply to a load via a microgrid power system independent of a commercial power system, and the microgrid power control method. It is characterized by including a step of detecting the frequency and voltage of the system and a step of controlling the power supply to the load according to the system power detection result of the system detector.

In this way, the frequency and voltage of the microgrid power system are detected by the step of detecting the frequency and voltage of the microgrid power system, and the power is supplied to the load according to the system power detection result of the system detector. The control process does not match the power supply of the microgrid power supply to the load power consumption, but controls the power supply to the load according to the magnitude of the power supply of the microgrid power supply. Therefore, for example, by using a renewable energy power source so that the load power consumption becomes larger than the supply power, or conversely, the load power consumption becomes lower than the supply power, the balance between the supply power and the load power consumption is balanced. It is possible to balance the two so that they do not collapse significantly, and it is possible to provide a microgrid power control method that does not require a large-capacity power adjustment facility even if power is generated using a renewable energy power source. ..

It is a figure for demonstrating the microgrid power system 100 which concerns on Embodiment 1. FIG. It is a figure for demonstrating the control device 5 of the microgrid power system 100 which concerns on Embodiment 1. It is a flowchart for demonstrating the power supply at the time of a disaster of the microgrid power system 100 which concerns on Embodiment 1. It is a flowchart for demonstrating the power supply control according to the frequency and voltage of the microgrid power system 100 which concerns on Embodiment 1. It is a graph for demonstrating the relationship of time-supply power, load power consumption in the microgrid power system 100 which concerns on Embodiment 1. It is a table for demonstrating the relationship of frequency / voltage, load, and control in the microgrid power system 100 which concerns on Embodiment 1. FIG. 5 is a power supply control flowchart according to a system power detection result (frequency / voltage) in the microgrid power system 100 according to the first embodiment. 6 is a power supply control flowchart according to a system power detection result (frequency / voltage) and branch power consumption in the microgrid power system 100 according to the first embodiment. It is a table for demonstrating the power supply control according to the priority in the microgrid power system 100 which concerns on Embodiment 1. It is a table for demonstrating the power supply control according to the priority in the microgrid power system 200 which concerns on Embodiment 2. It is a table for demonstrating the power supply control according to the priority in the microgrid power system 300 which concerns on Embodiment 3. It is a table for demonstrating the power supply control according to the priority in the microgrid power system 400 which concerns on Embodiment 4. It is a graph for demonstrating the relationship of time-supply power, load power consumption in the microgrid power system 500 which concerns on Embodiment 5.

Hereinafter, the microgrid power system, the control device, and the microgrid power control method of the present invention will be described based on each embodiment shown in the figure. Each drawing is a schematic view and does not necessarily accurately reflect the actual shape, structure, configuration, process, and the like. Each embodiment described below does not limit the invention according to the claims. Moreover, not all of the components and combinations thereof described in each embodiment are essential to the present invention. In the following description, the same reference numerals may be used across the embodiments for the components that can be regarded as substantially equivalent, and the description may be omitted again.

[Embodiment 1]
The microgrid power system 100 (and the control device 5 and the microgrid power control method) according to the first embodiment will be described with reference to FIGS. 1 to 9.
Overview Figure 1 microgrids power system 100 is a diagram for explaining a micro-grid power system 100 according to the first embodiment. The microgrid power system 100 includes a microgrid 6A (microgrid power system) and a control device 5. The microgrid 6A is normally connected in parallel with the commercial power supply system 8, but in the event of a large-scale disaster or the like, it is disconnected by a commercial system switch 81, a microgrid switch 7A, etc. that cover a wide area. To be separated). Power supply from large power plants (large power sources) such as thermal power plants 91 and LNG power plants 92 of the commercial power system 8 is lost (similarly, microgrids 6B and 6C are also solved by microgrid switches 7B and 7C. Will be lined up).
In the first embodiment, in order to explain the present invention in an easy-to-understand manner, four branch distribution lines 12 are branched from the main distribution line 11A, and four re-branch distribution lines 16 are branched from each branch distribution line 12. However, the number of these is arbitrary. Further, the number of re-branch distribution lines 16 branched from each branch distribution line 12 may be different.

The microgrid 6A is further branched from the main distribution line 11A connected to the commercial power supply system 8, the branch distribution line 12 (12A, 12B, 12C, 12D) branched from the main distribution line 11A, and the branch distribution line 12. There are re-branch distribution lines 16 (16A, 16B, 16C, 16D). A load 19 is connected to the branch distribution line 12 or the re-branch distribution line 16. When the microgrid 6A is disconnected from the commercial power supply system 8, power is supplied from the microphone lid power supply 1 to the load 19 via the main distribution line 11A and the branch distribution lines (12, 16).

In the first embodiment, the microphone lid power source 1 has a first power source 1A (solar power generation power source) and a second power source 1B (storage battery power source). The first power source 1A includes a solar panel 1A1 (solar cell) and a power conditioner 1A2 (inverter) that converts its DC output into alternating current and outputs it. The second power source 1B includes a storage battery 1B1 and a bidirectional inverter 1B2 that converts its DC output into alternating current and outputs it. The bidirectional inverter 1B2 is used to charge the storage battery 1B1 from the commercial power system 8 when the microgrid 6A is parallel (connected) to the commercial power system 8. The second power source 1B supplies power to the microgrid 6A when the microgrid 6A is disconnected from the commercial power system 8, but even when the microgrid 6A is parallel to the commercial power system 8. For example, when charging and power supply are performed by separating the charging time zone and the power supply time zone when parallel to the commercial power system 8, power is supplied to the commercial power system 8. You may do so.

A system detector 3A for detecting the frequency and voltage of the microgrid power system 6A is installed on the main distribution line 11A. The frequency and voltage detection may be a set of a separate frequency detector and voltage detector, in addition to an integrated detector that detects both. Such detectors are widely known and will not be described.
The branch distribution line 12 (12A, 12B, 12C, 12D) is provided with a branch detector 14 (14A, 14B, 14C, 14D) that detects the power consumption consumed by the load 19 through the branch distribution line 12. ing. Similarly, the re-branch detector 18 (18A, 18B, 18C, 18D) is also installed on the re-branch distribution line 16 (16A, 16B, 16C, 16D). Such detectors are widely known and will not be described.

The branch distribution line 12 (12A, 12B, 12C, 12D) is provided with a branch switch 13 (13A, 13B, 13C, 13D) for cutting off the connection of the same line, and the re-branch distribution line 16 (16A, 16B, 16C) is provided. , 16D) is provided with a re-branch switch 17 (17A, 17B, 17C, 17D) that cuts off the connection of the same line (partially not shown).
Although not shown in FIG. 1, the branch distribution lines 12 (12A, 12B, 12C, 12D) are distributed to each building 21 (21A, 21B, 21C, 21D). The re-branch distribution line 16 is branched by four for each branch distribution line 12. Explaining with the branch distribution line 12A, it is branched into 16A1, 16A2, 16A3, and 16A4 in order from the left of FIG. 1 (not shown). The re-branch switch 17 is also branched into 17A1, 17A2, 17A3, and 17A4 in order from the left (not shown).

The control device 5 has a power supply control unit 4A, and also controls the display of which of the main distribution line 11A, the branch distribution line 12, and the re-branch distribution line 16 is supplied with power from the microgrid power supply 1. It may have a power grid display control unit 101 or the like.
The control device 5 (power supply control unit 4A) controls connection disconnection of the branch switch 13 (13A, 13B, 13C, 13D), the rebranch switch 17 (17A, 17B, 17C, 17D) and the like.

The configuration diagram 2 of the control device 5 is a diagram for explaining the control device 5 (and the power supply control unit 4A) of the microgrid power system 100 according to the first embodiment.
The control device 5 includes a system detector 3A, a branch detector 14 (14A, 14B, 14C, 14D), a rebranch detector 18 (18A, 18B, 18C, 18D), a branch switch 13 (13A, 13B, 13C,). 13D) and the re-branch switch 17 (17A, 17B, 17C, 17D) are connected by a signal line 51. The control device 5 receives the detection result of the system detector 3A, the branch detector 14, or the re-branch detector 18 via the signal line 51, and the branch switch 13 or the re-branch switch 17 via the signal line 51. The connection disconnection is controlled to gradually control the power supply supplied from the microgrid power supply 1 to the load 19.
The control device 5 includes a branch switch 13 (A, B, C, D), a rebranch switch 17 (A, B, C, D), and a power supply control unit 4A. The power supply control unit 4A cuts off the connection between the branch switch 13 and the rebranch switch 17, and controls the power supply supplied from the microgrid power supply 1 to the load 19 so as to gradually increase or decrease. It may be controlled stepwise.
In the event of a disaster, the control device 5 is supplied with power from a special power source for disasters that is not affected by the disaster.

The control device 5 has a power supply control unit 4A. The power supply control unit 4A includes a CPU (Central Processing Unit) 41, a ROM (Read Only Memory) 42, a RAM (Random Access Memory, a memory that can be read and written arbitrarily) 43, and an I / O (I / O). It is composed of a microcomputer having an Input / Output controller (input / output controller) 44, an internal bus 45 of a microcomputer that electrically connects them, and the like. The ROM 42 stores programs (a series of instructions assembled for processing, control, etc.) and various data for performing various controls including display control and input / output control, calculations, and the like. Various data and programs are expanded into a memory in the RAM 43, and are used as a memory for a work for the CPU 41 to perform various processes. The CPU 41 reads and executes a program that describes an instruction (process) for the CPU 41. The power supply control unit 4A is a CPU 41 (microcomputer) that reads a program and executes a function of controlling the power supply supplied from the microgrid power supply 1 to the load 19 according to the system power detection result of the system detector 3A. You can also say that.

The internal bus 45 of the power supply control unit 4A is connected to the signal line 51 via the interface 46. The signal line 51 also serves as an external bus. The signal line 51 may be wireless instead of wired. In addition, an intranet, the Internet, or the like may have a radial, mesh, or other net configuration.
The detection results of the system detector 3A and the branch detectors (12, 19) are sent to the control device 5 (power supply control unit 4A, CPU 41) via the signal line 51, and conversely, the control device 5 (power supply control). A control signal for disconnecting the connection is sent from the unit 4A, CPU 41) to the branch switch (13, 17).

Formation of Microgrid 6A Embodiment 1 assumes a case where a power plant (91, 92), a power transmission tower, a power transmission network, etc. of the commercial power system 8 is damaged by a large-scale earthquake, a large typhoon, or the like. Is. FIG. 3 is a flowchart for explaining the power supply of the microgrid power system 100 according to the first embodiment at the time of a disaster. In such a case, the control device 5 (power supply control unit 4A, CPU 41) shuts off the micro grid switch 7A to form the micro grid 6A disconnected from the commercial power system 8 (FIG. 3, step S01). ). Then, the control device 5 temporarily resets the power supply in the microgrid 6A to the initial state (the power supply P1 from the microgrid power supply 1 is set to zero, S03). After that, the control device 5 starts power supply from the microphone lid power supply 1 (S05).

Outline of Power Supply Control in Microgrid 6 FIG. 4 is a flowchart for explaining power supply control according to the frequency and voltage of the microgrid power system 100 according to the first embodiment. When power is supplied from the microphone lid power supply 1 under the control (command) of the power supply control unit 4A (CPU 41) (see FIGS. 3 and S05), the frequency and voltage are measured by the system detector 3A provided on the main distribution line 11A. Detection is performed (S1).
The power supply control unit 4A receives the detection result and determines whether or not it is necessary to limit the power supply to the load 19 (S2).
The power supply control unit 4A returns the control step to S1 when it determines that it is not necessary to limit the power supply to the load 19.
On the other hand, when the power supply control unit 4A determines that it is necessary to limit the power supply to the load 19, the branch switch (13, 17) connected to the load 19 is connected or disconnected to connect or disconnect the load. The power supply to 19 is controlled (S3). Then, the power supply control unit 4A returns the control step to S1.
The power supply control unit 4A repeats the same control step. When the power supply control unit 4A determines that it is necessary to further limit the power supply to the load 19 based on the frequency / voltage detection result even by connecting or disconnecting one branch switch (13, 17), another branch is used. The power supply to another branch distribution line (12, 16) (load 19) is controlled by connecting or disconnecting the switch (13, 17).

Load Control for Supply Power FIG. 5 is a graph for explaining the relationship between time-supply power and load power consumption in the microgrid power system 100 according to the first embodiment. Under the control of the power supply control unit 4A (control device 5), the load 19 (load power consumption P1, supply power P1 to the load 19) changes according to the system power detection result in response to a change in the magnitude of the supply power P1. It is a graph which shows the state of being controlled.
When a disaster occurs, the power supply control unit 4A gives priority (priority) to the second power supply 1B among the first power supply 1A and the second power supply 1B to start power supply. That is, the power supply is started from the second power supply 1B at the time t0 in FIG. 5, but the magnitude of the supplied power P1 is controlled to be gradually changed (increased) (see also FIGS. 3, S03, and S05). The system detector 3A detects the frequency and voltage of the microgrid power system 6A while the power is being supplied to the microgrid power system 6A, and the power supply control unit 4A detects the system power detection result of the system detector 3A. The power supply to the load 19 is controlled according to the above. Therefore, the power consumption J1 gradually changes (increases) in accordance with (following) the magnitude of the supplied power P1.
Under the control of the power supply control unit 4A, the size of the power supply P1 reaches a certain size (PW1) at time t1, and there is no further increase. Then, the power supply control unit 4A causes the power consumption J1 (power supply to the load 19) to follow the power supply P1 (magnitude) from the microgrid power supply 1.
When the power supply from the microgrid power supply 1 to the load 19 is terminated (at the end), it is preferable that the power supply control unit 4A gradually changes (decreases) the magnitude of the supplied power P1. In that case, the power supply control unit 4A gradually changes (decreases) the power consumption J1 in accordance with (following) the magnitude of the power supply P1. The magnitude of the supplied power supplied to the load 19 gradually changes (decreases).

The power supply control unit 4A also starts power supply from the first power supply 1A at time t2, and as a result, power is supplied from both the second power supply 1B and the first power supply 1A. Under the control of the power supply control unit 4A, at time t3, the power supply P1 reaches a magnitude (PW2) at which the increase is almost eliminated. After that, the power supply P1 from the microgrid power supply 1 increases or decreases around the magnitude PW1 of the power supply due to changes in the natural environment such as cloud conditions. The power supply control unit 4A causes the power consumption J1 (power supply to the load 19) to follow the power supply P1 (magnitude) from the microgrid power supply 1.

Power supply from the microgrid power supply 1 When the power supply control unit 4A starts power supply (at the start, time t0 to t1, see FIG. 5), the output of the storage battery 1B1 of the second power supply 1B is converted from DC to AC. By controlling the bidirectional inverter 1B2, the supplied power P1 (output) is gradually increased. When the supplied power P1 increases and reaches a certain value, it does not increase (time t1 to t2). The second power source 1B is not easily affected by the influence of the natural environment, and there is almost no change in increase or decrease due to the influence of the natural environment.
After that, the power supply control unit 4A gradually increases the power supply P1 (output) by controlling the power conditioner 1A2 that converts the output of the solar panel 1A1 of the first power supply 1A into DC-AC (time t1 to t2). .. The power supply P1 between the times t1 and t2 is a combination of the power supply from the second power supply 1B and the power supply from the first power supply 1A. The first power source 1A is easily affected by the influence of the natural environment (the influence of weather, clouds, etc.), and is liable to fluctuate due to the influence of the natural environment (the power supply is large when it is sunny, and small when it is rainy or cloudy). . Power supply increases or decreases due to the movement of clouds, etc.).

Power supply control according to the system power detection result (frequency / voltage) With reference to FIGS. 6 and 7, an example of power supply control according to the system power detection result (frequency / voltage) by the power supply control unit 4A will be described.
FIG. 6 is a table for explaining the relationship between frequency / voltage / load / control in the microgrid power system 100 according to the first embodiment. FIG. 6A is a table for explaining the relationship between frequency, load, and control, and FIG. 6B is a table for explaining the relationship between voltage, load, and control.
FIG. 7 is a power supply control flowchart (based on the relationship with FIG. 6) according to the system power detection result (frequency / voltage) in the microgrid power system 100 according to the first embodiment.

The flowchart of FIG. 7 will be described with reference to FIG.
First, the frequency and voltage are detected by the system detector 3A provided on the main distribution line 11A (S1).
Next, the power supply control unit 4A determines whether the load 19 (power consumption of the load 19 or power supplied to the load 19) is under, excessive, or appropriate according to the table of FIG. 6 ( S21, S22), and control is performed accordingly (S31, S32, S35, S36).

Relationship between frequency, load, and control When the power supply control unit 4A determines by the detection frequency (S21), the control is performed based on FIG. 6 (A) (see the figure).
That is, when it is determined that the frequency detected by the system detector 3A is higher (or increased, or excessive) than a certain value, the power supply control unit 4A connects a part of the branch switches (13, 17) to load. Power supply to a part of 19 is started (S31). This is to correct the fact that the load 19 (the power consumption of the load 19 and the power supplied to the load 19) is too small (decreased from a certain value).
On the contrary, when it is determined that the frequency detected by the system detector 3A is lower than a certain value (or lowered or too small), the power supply control unit 4A shuts off a part of the branch switches (13, 17). The power supply to a part of the load 19 is stopped (S32). This is to correct that the load 19 (the power consumption of the load 19 and the power supplied to the load 19) is excessive (increased from a certain value). Then, the power supply control unit 4A returns the control step to S1.

Relationship between voltage, load, and control When the power supply control unit 4A determines by the detected voltage (S22), the control is performed based on FIG. 6 (B) (see the same figure).
That is, when it is determined that the voltage detected by the system detector 3A is lower than a certain value (or has dropped or is too small), the power supply control unit 4A shuts off a part of the branch switches (13, 17) and loads the load. The power supply to a part of 19 is stopped (S32). This is to correct the fact that the load 19 (the power consumption of the load 19 and the power supplied to the load 19) is excessive (images from a certain value). Then, the power supply control unit 4A returns the control step to S1.
On the contrary, when it is determined that the voltage detected by the system detector 3A is higher (or increased) than a certain value, the power supply control unit 4A connects a part of the branch switches (13, 17) to load. Power supply to a part of 19 is started (S31). This is to correct the fact that the load 19 (the power consumption of the load 19 and the power supplied to the load 19) is too small (decreased from a certain value).
Note that, in FIG. 7, the power supply control unit 4A exemplifies the control according to the detection voltage after the control according to the detection frequency, but the power supply control unit 4A detects after the control according to the detection voltage. The control may be performed according to the frequency.

Power supply control according to grid power detection result and branch power consumption FIG. 8 is a power supply control flowchart according to the grid power detection result (frequency / voltage) and branch power consumption in the microgrid power system 100 according to the first embodiment. be. The flowchart of FIG. 8 is a power supply control flowchart in which a control flow (S41, S42, S43, S45, S46, S47) for controlling the power supply according to the branch power consumption is further added to the flowchart of FIG.
These additional flows (processing) will be described. The flow other than the addition is the same as that in FIG. 7, and the description thereof will be omitted.

In the flowchart of FIG. 8, after S31, the branch detectors (14, 18) detect the branch power consumption consumed by the load 19 through the branch distribution lines (12, 16) (S41). The power supply control unit 4A controls S42.
In S42, the power supply control unit 4A determines whether or not the branch power consumption is excessive. If it is determined that it is not excessive, the control step (processing step) is advanced to S22. If it is determined that it is excessive, the control step is advanced to S43.
In S43, the power supply control unit 4A shuts off the branch switch (13, 17) once connected to the branch distribution line (12, 16) determined to have excessive branch power consumption. Then, the power supply control unit 4A returns the control step to S1.

The control steps S45, S46 and S47 are the same as those of the control steps S41, S42 and S43.
That is, after the control step S35, the branch detector (14, 18) detects the branch power consumption consumed by the load 19 through the branch distribution line (12, 16) (S45), and the power is supplied. The control unit 4A advances the control step to S46.
In the control step S46, the power supply control unit 4A determines whether or not the branch power consumption is excessive. If it is determined that the branch power consumption is not excessive, the control step is returned to S1. If the power supply control unit 4A determines that the power supply control unit 4A is excessive, the control step is advanced to S47.
In S47, the power supply control unit 4A (CPU 41) shuts off the branch switch (13, 17) once connected to the branch distribution line (12, 16) determined to be excessive. Then, the control step is returned to S1.

Control according to priority FIG. 9 is a table for explaining power supply control according to priority in the microgrid power system 100 according to the first embodiment.
For each branch distribution line 12 (building 21) and re-branch distribution line 16, the priorities shown in the "building priority (branch distribution line priority)" column and the "re-branch distribution line (load) priority" column are set in advance. It is attached. These rankings are based on the type (attribute) of importance, urgency, publicity, etc. in "building (branch distribution line)" and "re-branch distribution line (load)".
In the horizontal "building priority (branch distribution line priority)" column of the table, the branch distribution line 12 and the building 21 corresponding to the branch distribution line 12 (the building to which the branch distribution line 12 is drawn) are predetermined. The priorities are listed. This first indicates the priority of power supply to the building 21 (branch distribution line 12) in the microgrid 6A. That is, it is a predetermined priority of buildings A (office), building B (hospital), building C (evacuation center), and buildings D1 to D100 (general houses 1 to 100) in the microgrid 6A.

Further laterally in the table, columns "re-branching distribution line 16", "load 19 (connected to re-branching distribution line 16)", and "re-branching distribution line (load) priority" are provided.
The priority described in the "re-branch distribution line (load) priority" column indicates a predetermined priority of the re-branch distribution line 16 (load 19) in each branch distribution line 12 (each building 21). Is. Each has a priority of 1 to 4.
For example, each branch distribution line 12 is branched into four re-branch distribution lines 16 (for example, the branch distribution line 12A of the building 21A is branched into four re-branch distribution lines 16A1 to 16A4). .. Then, loads classified by type are connected to each re-branch distribution line 16. An emergency communication device is connected to the re-branch distribution line 16A1 of the building 21A (government office), an emergency lighting device is connected to the 16A2, an office device is connected to the 16A3, and other electric devices are connected to the 16A4. The "re-branch wiring (load) priority" column shows the predetermined priority of such re-branch distribution line 16 (load 19) for each branch distribution line 12 (each building 21). be.

In the "overall priority" column in the horizontal direction of the table, the overall priority of the re-branch distribution line 16 (load 19 connected to the re-branch distribution line 16) is shown.
The "overall priority" is an overall priority determined by the power supply control unit 4A from "building priority (branch distribution line priority)" and "re-branch distribution line (load) priority".
The power supply control unit 4A sets the "overall priority" to the "building priority (branch distribution line priority)" order, and "re-branches" the unconnected re-branch distribution line 16 for each branch wiring line 12. The distribution line (load) priority is ranked in order, and the ranking is made one after another in the order of repeating once again (two rounds, three rounds ...).

Then, the connection is repeated one by one in order (from the highest order) based on the "overall priority". In this way, according to the "overall priority", the branch distribution lines (12, 16, load 19) having a high priority are preferentially connected to supply electric power. Then, the power supply to the load 19 is controlled by gradually disconnecting the branch switches (13, 17).
When the branch switch (13, 17) is cut off to stop (end) the power supply to the branch distribution line (12, 16), on the contrary, the one with the lowest overall priority is cut off. Stop (end) the power supply.

Others (1) A large-capacity capacitor may be provided in parallel with the microgrid power supply 1 (1A, 1B) (between the main distribution line 11A and the ground). The large-capacity capacitor can absorb minute fluctuations in the power consumption of the load 19, for example.

(2) The power supply control unit 4A sets the priority of "building priority (branch distribution line priority)" and "re-branch distribution line (load) priority" to "building (branch distribution line)" or "re-branch distribution line". It may be decided (assigned) based on the type (attribute) of "branch distribution line (load)", and "overall priority" may be decided (assigned) according to them.

(3) A third power supply similar to the second power supply 1B (having a storage battery 1B1 and a bidirectional inverter 1B2 like the second power supply 1B) is connected to the microgrid 6A in parallel with the second power supply 1B. You may.
Then, the power supply control unit 4A may charge the other while supplying power from one of the second power supply 1B and the third power supply (not shown).
Alternatively, the power supply control unit 4A sets the power supplied from the first power supply 1A to a certain value or less, and charges the third power supply (or the second power supply 1B not supplying power) when the power supply exceeds a certain value. May be (peak shift).

When the re-branch distribution line 16 (load 19) is connected to the power supply control unit 4A, the size of the power (branch power consumption) supplied to the load 19 via the re-branch distribution line 16 (load 19) is excessive (from a predetermined size). If it is excessive), the connection may be cut off and the re-branch distribution line 16 (load 19) having the next highest priority may be connected. In this way, it is possible to supply electric power to more re-branch distribution lines 16 (load 19).

By the way, the microgrid power control method for supplying power from the microgrid power supply 1 to the load 19 via the microgrid power system 6A independent of the commercial power system 8 is a step of detecting the frequency and voltage of the microgrid power system 6A. The microgrid power control can include, and a step of controlling the power supply to the load 19 according to the system power detection result of the system detector 3A.

The microgrid power system 100 has the effects described in the above [1] to [9].
Further, the control device 5 has the effect described in the above [11].
Further, the microgrid power control method has the effect described in the above [12].

[Embodiment 2]
FIG. 10 is a table for explaining the power supply control according to the priority in the microgrid power system 200 according to the second embodiment.
The microgrid power system 200 according to the second embodiment is basically the same as the microgrid power system 100 according to the first embodiment, but in the first embodiment, the power supply control unit 4A sets the "overall priority". , In the order of "building priority (branch distribution line priority)", one for each branch wiring line 12 and one in the order of "re-branch distribution line (load) priority", whereas in the second embodiment, power is supplied. The control unit 4A sets the "overall priority" in the order of "building priority (branch distribution line priority)" in the first round, for each branch wiring line 12, and in the order of "re-branch distribution line (load) priority". In the subsequent rounds (two rounds, three rounds, ...), in the order of "building priority (branch distribution line priority)", each branch wiring line 12 and "re-branch distribution line (load) priority" The difference is that they are attached one by one in order.
In addition, the power supply control unit 4A sets the priority of "building priority (branch distribution line priority)" and "re-branch distribution line (load) priority" to "building (branch distribution line)" or "re-branch". It may be decided (assigned) based on the type (attribute) of "distribution line (load)", and "overall priority" may be decided (assigned) according to them.

In the second embodiment, the power supply control unit 4A sets the "overall priority" in the order of "building priority (branch distribution line priority)" in the first round, and "re-branch distribution line (re-branch distribution line)" for each branch wiring line 12. Two in the order of "load) priority", and in the subsequent rounds (two rounds, three rounds, ...), in the order of "building priority (branch distribution line priority)", each branch wiring line 12 and "re-branch" The power supply control unit 4A is the same as the first embodiment except that the power supply control unit 4A controls the power supply according to the "overall priority" by assigning one by one in the order of "distribution line (load) priority". Among the effects of the microgrid power system 100, the control device 5, or the microgrid power control method according to No. 1, the corresponding effect is also obtained.

[Embodiment 3]
FIG. 11 is a table for explaining the power supply control according to the priority in the microgrid power system 300 according to the third embodiment.
The microgrid power system 300 according to the third embodiment is basically the same as the microgrid power system 100 according to the first embodiment, but in the first embodiment, the power supply control unit 4A is a re-branch distribution line 16 A different "overall priority" is assigned to each (load 19), and the power supply control unit 4A controls the power supply according to the "overall priority", whereas in the third embodiment, the power supply control unit 4A controls the power supply. , A plurality of re-branch distribution lines 16 (load 19) are given the same "overall priority", and the power supply control unit 4A controls the power supply according to the "overall priority".

That is, in the first embodiment, the power supply control unit 4A sets the "overall priority" in the order of "building priority (branch distribution line priority)" for each branch wiring line 12 and "re-branch distribution line (load)". In contrast to the third embodiment, the power supply control unit 4A assigns the "overall priority" to the "building priority (branch distribution)" of the demanding buildings (buildings A, B, C). The same rank 1 is given to "electric power priority" and the same rank 2 is given to "building priority (branch distribution line priority)" of general houses 1 to 100, and the same rank is given to multiple re-branched distribution lines (loads). Attach. Then, the power supply control unit 4A controls the power supply according to the "overall priority".

Then, when the power supply control unit 4A disconnects the branch switches (13, 17) according to the "overall priority", the power supply control unit 4A arbitrarily selects and branches the re-branch distribution line 16 having the same "overall priority". The switch (13, 17) is disconnected. After disconnecting the branch switches (13, 17) for all the re-branch distribution lines 16 having the same "overall priority", the re-branch distribution line 16 of the next "overall priority" is disconnected.
In addition, the power supply control unit 4A sets the priority of "building priority (branch distribution line priority)" and "re-branch distribution line (load) priority" to "building (branch distribution line)" or "re-branch". It may be decided (assigned) based on the type (attribute) of "distribution line (load)", and "overall priority" may be decided (assigned) according to them.

The third embodiment is the same as the first embodiment except that the power supply control unit 4A assigns the same "overall priority" to the plurality of re-branched distribution lines 16. It also has the corresponding effect among the effects of the microgrid power system 100, the control device 5, or the microgrid power control method.

[Embodiment 4]
FIG. 12 is a table for explaining the power supply control according to the priority in the microgrid power system 400 according to the fourth embodiment.
The microgrid power system 400 according to the fourth embodiment is basically the same as the microgrid power system 100 according to the first embodiment, but in the first embodiment, the power supply control unit 4A is a re-branch distribution line 16 A different "overall priority" is assigned to each (load 19), and the power supply control unit 4A controls the power supply according to the "overall priority", whereas in the fourth embodiment, the power supply control unit 4A controls the power supply. , The same type of re-branch distribution line 16 of the same type of building (branch distribution line 12) is given the same "overall priority", and the power supply control unit 4A powers according to a plurality of the same "overall priority". The difference is that it controls the supply.

That is, in the first embodiment, the power supply control unit 4A sets the "overall priority" in the order of "building priority (branch distribution line priority)" for each branch wiring line 12 and "re-branch distribution line (load)". In the fourth embodiment, the power supply control unit 4A assigns the same "overall priority" to a plurality of re-branched distribution lines (loads) for each type of building, whereas they are assigned one by one in the order of "priority".

For example, the buildings A1 and A2 of the government offices 1 and 2 are given "building priority (branch distribution line priority)" 1 as the same type of building, but the power supply control unit 4A has the re-branch distribution line 16A1. Add the same "overall priority" 1 to -1, 16A2-1. Similarly, the buildings B1 and B2 of the hospitals 1 and 2 are given "building priority (branch distribution line priority)" 2 as buildings of the same type, but the power supply control unit 4A has the re-branch distribution line 16B1- The same "overall priority" 2 is given to 1, 16B2-1. The same applies to evacuation shelters 1 (12) and general houses (1 to 200).
Then, the power supply control unit 4A supplies power by connecting the branch switches (13, 17) according to such "overall priority".

Further, the power supply control unit 4A connects the branch switch 17A1-1 and supplies power to the load 19 via the re-branch distribution line 16A1-1 according to the "overall priority", but the power supply flowing there. If the size of is larger than a certain value, the branch switch 17A1-1 is shut off. Further, when the branch switch 17A2-1 of the same "overall priority" is connected and power is supplied to the load 19 via the re-branch distribution line 16A2-1, the magnitude of the supplied power flowing there is not a certain value or less. If there is, the branch switch 17A1-1 of the same "overall priority" is connected again, power is supplied to the load 19 via the re-branch distribution line 16A1-1, and the magnitude of the supplied power flowing there is less than a certain value. If it is, connect it as it is, if it is larger than a certain value, shut off the branch switch 17A1-1, and perform the same control with the re-branch distribution lines 16B1-1 and 16B2-1 in the next "overall priority" 2. .. Such control (processing) is repeated.
By the way, the power supply control unit 4A sets the priority of "building priority (branch distribution line priority)" and "re-branch distribution line (load) priority" to "building (branch distribution line)" or "re-branch". It may be decided (assigned) based on the type (attribute) of "distribution line (load)", and "overall priority" may be decided (assigned) according to them.

In the fourth embodiment, the power supply control unit 4A assigns the same "overall priority" to the re-branch distribution line 16 of the same type of the same type of building (branch distribution line 12). Since it is the same as that of the first embodiment, it also has the corresponding effect among the effects of the microgrid power system 100, the control device 5, or the microgrid power control method according to the first embodiment.

[Embodiment 5]
FIG. 13 is a graph for explaining the relationship between time-supply power and load power consumption in the microgrid power system 500 according to the fifth embodiment.
The microgrid power system 500 according to the fifth embodiment is basically the same as the microgrid power system 100 according to the first embodiment, but when the power supplied from the first power source 1A becomes a certain size or more, the second power supply is second. The difference is that the power supply from the power supply 1B is stopped.

In the microgrid power system 500 according to the fifth embodiment, as shown in FIG. 13, the power supply control unit 4A starts power supply from the second power supply 1B at time t0, and the magnitude of the supplied power is constant at time t1. After reaching the magnitude (PW1), power supply is also started from the first power source 1A at time t2 (the time difference between times t1 to t2 may be zero or more and t1 = t2) (the above points are the embodiments). Control as in 1). At time t2-2, the magnitude of the power supplied from the first power supply 1A is the same as the magnitude of the power supplied from the second power supply 1B (PW1), that is, the total power supplied from both power sources becomes 2.PW1. At time t2-3, the magnitude of the power supplied from the first power source 1A is greater than or equal to the magnitude of the power supplied from the second power source 1B (PW1 + Y, that is, the total power supplied from both power sources is 2. PW1 + Y, Y is When it becomes zero or more), the power supplied from the second power source 1B is gradually reduced (time t2-3 to t2-4). The power supply from the microgrid power supply 1 is only from the first power supply 1A at time t2-4.

Then, when the power supply from the first power supply 1A becomes sufficiently large and the power supply from the second power supply 1B is stopped, the power supply control unit 4A supplies the power from the first power supply 1A to the load 19. The second power source 1B may be charged. Further, when the power supplied from the first power source 1A exceeds a certain magnitude, the power supplied beyond (or exceeding) may not be supplied to the load 19 and may be used for charging the second power source 1B (peak shift). ).

The microgrid power system 500 according to the fifth embodiment has the effect described in the above [10].
In the microgrid power system 500 according to the fifth embodiment, the power supply control unit 4A stops the power supply from the second power supply 1B when the power supply from the first power supply 1A becomes larger than a certain level. In this respect, it is the same as the power control device 5 (control method) according to the first embodiment, and therefore, it corresponds to the effects of the microgrid power system 100, the control device 5, or the microgrid power control method according to the first embodiment. It also has an effect.

[Embodiment 6]
In the microgrid power system (not shown) according to the sixth embodiment, the microgrid is a microgrid originally disconnected from the commercial power system 8.
The microgrid power system according to the sixth embodiment is basically the same as the power control device 5 (control method) according to the first embodiment, but the microgrid (power supply system) to be controlled is, for example, the Japanese archipelago. Originally, it is a (independent) power supply system isolated from the commercial power supply system 8 like the microgrid (power supply system) on the remote island isolated from the commercial power supply system 8 on the four main islands of the above, and from the commercial power supply system 8. It differs in that it is untied.

In the microgrid power system according to the sixth embodiment, the microgrid 6 (power supply system) is originally disconnected from the commercial power supply system 8 (see FIG. 3, S01). Then, the power supply control unit 4A sets the supply power P1 to the initial state (zero) in the initial state of the microgrid 6 (power supply system) (S03), but then supplies power from the microphone lid power supply 1 (S05). ..

The microgrid power system according to the sixth embodiment is the same as the microgrid power system 100 according to the first embodiment except that the microgrid (power supply system) is originally disconnected from the commercial power supply system 8. Therefore, it also has the corresponding effect among the effects of the microgrid power system 100, the control device 5, or the microgrid power control method according to the first embodiment.

Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the above-described embodiment. It can be implemented in various forms as long as it does not deviate from the purpose. For example, the following modifications are possible.

(1) In the above-described first to sixth embodiments, the solar panel 1A1 is used as the first power source 1A, but for example, a wind power generator may be used. Further, instead of the second power source 1B using the storage battery 1B1, for example, an EV vehicle battery, a small hydroelectric generator, an engine generator using gasoline or the like as fuel may be used.

(2) In the above-described first to fifth embodiments, when the microphone lid power system 6A is parallel (connected) to the commercial power system 8, the power generated by the solar panel 1A1 is used as the commercial power system 8 or the microgrid power system 6A. May be supplied to.

(3) In the above-described first to fifth embodiments, the storage battery 1B1 may be charged when the microgrid power system 6A is parallel (connected) to the commercial power system 8.

(4) In the above-described first to sixth embodiments, the load 19 is connected to the re-branch distribution line 16, but may be connected to both the re-branch distribution line 16 and the branch distribution line 12.

(5) In the above-described first to fourth embodiments, examples of the branch distribution line 12 and the re-branch distribution line 16 are shown in FIGS. 9 to 12, respectively, but the branch distribution line 12 and the re-branch distribution line 16 are limited thereto. However, for example, the total number of branch distribution lines may be 10 to 100 or 1000 to 1000. Further, the total number of re-branched distribution lines may be 100 to 1000, 1000 to 10000, and 1000 to 30000.

1 ... Microgrid power supply, 1A ... 1st power supply, 1A1 ... Solar panel, 1A2 ... Power conditioner, 1B ... 2nd power supply, 1B1 ... Storage battery, 1B2 ... Bidirectional inverter, 3,3A ... System detector, 4A ... Power supply Control unit, 41 ... CPU, 42 ... ROM, 43 ... RAM, 44 ... I / O, 45 ... internal bus, 46 ... interface, 5 ... control device, 51 ... signal line, 6 (6A, 6B, 6C) ... microphone Lid (Mike lid power system), 7 (7A, 7B, 7C) ... Main distribution switch, 8 ... Commercial power system, 9A ... Large power plant (thermal power plant), 9B ... Large power plant (LNG power plant), 11 (11A) ... Main distribution line, 12 (12A, 12B, 12C, 12D) ... Branch distribution line, 13 (13A, 13B, 13C, 13D) ... Branch switch, 14 (14A, 14B, 14C, 14D) ... Branch detector, 16 (16A, 16B, 16C, 14D) re-branch distribution line, 17 (17A, 17B, 17C, 17D) ... re-branch switch, 18 (18A, 18B, 18C, 18D) ... re-branch detector , 19 ... Load, 21 (21A, 21B, 21C, 21D) ... Building, 91 ... Commercial power system switch, 101 ... Power grid display control unit, P1 ... Power supply, J1 ... Load power consumption, t0, t1, t2, t2-2, t2-3, t2-4, t3 ... Time, 100, 200, 300, 400, 500 ... Microgrid power system

Relationship between voltage, load, and control When the power supply control unit 4A determines by the detected voltage (S22), the control is performed based on FIG. 6 (B) (see the same figure).
That is, when it is determined that the voltage detected by the system detector 3A is lower than a certain value (or has dropped or is too small), the power supply control unit 4A shuts off a part of the branch switches (13, 17) and loads the load. The power supply to a part of 19 is stopped (S32). This is to correct that the load 19 (the power consumption of the load 19 and the power supplied to the load 19) is excessive ( increased from a certain value). Then, the power supply control unit 4A returns the control step to S1.
On the contrary, when it is determined that the voltage detected by the system detector 3A is higher (or increased) than a certain value, the power supply control unit 4A connects a part of the branch switches (13, 17) to load. Power supply to a part of 19 is started (S31). This is to correct the fact that the load 19 (the power consumption of the load 19 and the power supplied to the load 19) is too small (decreased from a certain value).
Note that, in FIG. 7, the power supply control unit 4A exemplifies the control according to the detection voltage after the control according to the detection frequency, but the power supply control unit 4A detects after the control according to the detection voltage. The control may be performed according to the frequency.

Claims (12)

A microgrid power system with a microgrid power system with a microgrid power supply.
A system detector that detects the frequency and voltage of the microgrid power system,
A microgrid power system further comprising a control device having a power supply control unit that controls the power supply supplied to the load from the microgrid power supply according to the system power detection result of the system detector. In the microgrid power system according to claim 1,
The microgrid power system includes a main distribution line to which the microgrid power supply is connected, a plurality of branch distribution lines to which the load is directly or indirectly branched from the main distribution line, and the branch distribution line. Further has a branch switch, which cuts off the connection,
The microgrid power system is characterized in that the power supply control unit controls power supply to the load by selectively disconnecting and disconnecting the branch switch according to the system power detection result. In the microgrid power system according to claim 2.
The power supply control unit is a microgrid power system characterized in that the power supply to the load is controlled by gradually disconnecting and disconnecting the branch switch. In the microgrid power system according to claim 2 or 3.
The power supply control unit is a microgrid power system characterized by connecting and disconnecting the branch switch according to the priority of the branch distribution line. In the microgrid power system according to claim 2 or 3.
A branch detector for detecting the power consumed via the branch distribution line is further provided.
The power supply control unit controls the power supply to the load by disconnecting the branch switch according to the system power detection result and the branch power consumption detected by the branch detector. A microgrid power system that features. In the microgrid power system according to claim 5.
The power supply control unit is a microgrid power system characterized in that when the branch power consumption of the branch distribution line provided with the branch switch exceeds a certain magnitude, the branch switch is shut off. In the microgrid power system according to any one of claims 1 to 6.
The microgrid is characterized in that when the power supply from the microgrid power supply to the load is started or ended, the power supply control unit gradually changes the magnitude of the supplied power supplied to the load. Power system. In the microgrid power system according to any one of claims 1 to 7.
The microgrid power supply is a microgrid power system characterized by having a first power source using renewable energy that is easily affected by the natural environment and a second power source that is not easily affected by the natural environment. In the microgrid power system according to claim 8.
The power supply control unit is a microgrid power system characterized in that, of the first power supply and the second power supply, the second power supply is prioritized to start power supply. In the microgrid power system of claim 9.
The power supply control unit is a microgrid power system, characterized in that the power supply from the second power supply is stopped when the power supplied from the first power supply becomes a certain magnitude or more. A control device used in the microgrid power system according to any one of claims 1 to 10.
A control device including the power supply control unit that controls the power supply supplied from the microgrid power supply to the load according to the system power detection result of the system detector. A microgrid power control method that supplies power from a microgrid power supply to a load via a microgrid power system that is independent of the commercial power system.
The process of detecting the frequency and voltage of the microgrid power system, and
A step of controlling the power supply to the load according to the system power detection result of the system detector.
A microgrid power control method comprising.

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