JP2020137382A - Extension type captive consumption system, power generation device, and extension type high voltage branch panel - Google Patents

Abstract

To realize "the reduction of the cost, a construction period, and a power stop period" or "the suppression of a reverse power" by attaching a power generation connection board with a built-in a power generation connection device to a system board with a built-in system connector.SOLUTION: An extension type captive consumption system is an electric power system 1 having a system board U with a built-in a system connector S and a load F. A board housing 4' of a power generation connection board 4 with a built-in a power generation conductor 3 that connects a power generation device 2 to the system connector S and the load F is attached to a board housing U of the system board U. The power generation conductor 3 may be connected to a bus bar cable way M, and may have a power storage part 5. A control part 9 may set zero or the like as a power generation target value TH once when reducing a generated power H. In addition, the power generation connection board 4 with the built-in power generation conductor 3 comprises: the power generation device 2 in which zero or the like is set as the power generation target value TH once when reducing the generated power H; a reverse power relay 10; a power reception counter 11; and a power generation counter 12.SELECTED DRAWING: Figure 1

Description

The present invention is a power system having a grid board with a built-in grid connection device, a load connected to the grid connection device, and a power generation connection board with a built-in power generation connection device for connecting the power generation device to the grid connection device and the load. In addition, a power generation device equipped with a power generation unit, a power conditioner, a transformer, and a control unit, and a power generation connection device for connecting a power generation device to a grid connection device and a load are built in the panel housing. Regarding.

Conventionally, a power management device is known (see Patent Document 1).
This power management device includes a first acquisition unit that acquires first information related to the power usage status of a consumer who has introduced a specific device having a power generation function or a power storage function at the first time point, and the first acquisition unit. The second acquisition unit that acquires the second information related to the electric power usage status of the consumer at the second time point after the time point, and the specific device that is a candidate to be introduced to the customer. Is obtained by comparing the acquired first information and the second information with the device information acquisition unit that acquires device information of a candidate device that is another device and has a power generation function or a power storage function. It includes an information output unit that outputs presentation information including device information of the candidate device according to a change in the power usage status.

Further, conventionally, an output control system is known (see Patent Document 2).
This output control system includes a solar cell module that generates photovoltaic power generation, a power conditioner that outputs generated power, an output control device that controls the power conditioner to control the output of generated power, and the generated power. It is equipped with a power measuring device that measures surplus power, which is the difference from the power consumption due to the in-house load that consumes this, and a control mode that gently controls according to the specifications agreed by the power company, and when the in-house power demand changes. It has a control mode that controls the amount of power generation at high speed.

Japanese Unexamined Patent Publication No. 2016-095598 Japanese Unexamined Patent Publication No. 2018-08784

However, in the power management device described in Patent Document 1, although it is determined whether or not to add a power generation device or the like, when actually adding a power generation device or the like, the power generation device to be added is added. Since it is necessary to separately create the foundation for installing the power generation or to match the level of the created foundation with the existing foundation, the cost will increase and the construction period for adding the power generation device will be extended by the amount of the separate foundation preparation and level matching.
Further, in the electric power management device of Patent Document 1, the electric power cannot be used by the consumer while the power generation device is added. Therefore, if the construction period is extended by the amount of separate foundation preparation and level adjustment, the electric power of the consumer is used. There is a problem that the period of stopping is prolonged.

Further, in the power management device of Patent Document 1, the output control system or the like described in Patent Document 2 is used.
However, in the output control system of Patent Document 2, even if the power conditioner is controlled to give a target value for reducing the output of the generated power, the actual output of the generated power does not decrease immediately (the decrease in the output of the generated power is delayed). Therefore, there is a risk that the output of the generated power will be larger than the power consumption of the load due to the delay, and reverse power will be generated (power that cannot be consumed by the load will flow to the grid).

In view of these points, the present invention relates to the case where the board housing of the power generation connection board in which the power generation connection device is built is attached to the board housing of the system board in which the system connection device is built, or when the power generation is reduced. Is a power system that can "reduce costs, construction period and power outage period" and "suppress reverse power generation" by temporarily setting the value of power generation to zero as the target value of power generation. The purpose is to provide a power generation device and a power generation connection board.

The power system 1 according to the present invention is a power system having a system board U in which a system connection device S connected to the system K is built and a load F connected to the system connection device S. It has a power generation connection board 4 in which a power generation connection device 3 for connecting the power generation device 2 to the connection device S and the load F is built, and the board housing 4'of the power generation connection board 4 is the board housing of the system board U. The first feature is that it is attached to the U'.

The second feature of the power system 1 according to the present invention is that, in addition to the first feature, the power generation connection device 3 is connected to a bus line M connecting between the system connection device S and the load F. There is a point.

The third feature of the electric power system 1 according to the present invention is that, in addition to the above-mentioned first or second feature, a power storage unit 5 for storing electric power is connected to the electric circuit between the system connection device S and the power generation device 2. There is a point.

The fourth feature of the power system 1 according to the present invention is that, in addition to the above-mentioned first to third features, the power generation device 2 has a power generation unit 6 that generates power and a DC current or AC from the power generation unit 6. A power conditioner 7 that converts a current into an AC current, a transformer 8 that transforms an AC current input from the power conditioner 7 into a higher-voltage AC current, and a higher-voltage AC current from the transformer 8. A control unit 9 that controls as the power generation H output from the power generation device 2 is provided, and the control unit 9 sets the power generation H to zero when the power generation H is lowered, and / or. A value lower than the power consumption D of the load F when the power generation H is lowered is once set as the target value TH of the power generation H.

Due to these features, unlike Patent Document 1, the power generation device is different from Patent Document 1 in that the board housing 4'of the power generation connection board 4 in which the power generation connection device 3 is built is attached to the board housing U'of the system board U. Even if 2 is added (expanded), it is not necessary to separately create a foundation for installing the power generation device 2 to be added, or to match the level of the created foundation with the existing foundation N, so the cost and the construction period for adding the power generation device 2 are required. It is possible to reduce the period during which consumers stop using electricity (“Reduction of costs, construction period and electricity suspension period”).
It can be said that such an electric power system 1 is a "self-consumption system" suitable for the user of the electric power system 1 to consume the electric power generated by the power generation device 2 by the load F, and further, the existing system. Since the power generation connection board 4 can be retrofitted (expanded) to the board U (power purchase board) or the like, it can be said that it is an "expansion type self-consumption system".

Further, by connecting the power generation connection device 3 to the bus line M between the system connection device S and the load F, for example, a system connection device S such as a high voltage of 6600 V or an extra high voltage (extra high voltage) of 22000 V or a bus line electric circuit. The power generation connection device 3 can be connected at the same high voltage as M, and the capacity of the power flowing from the power generation device 2 to the load F or the like can be increased by the connection at this high voltage.
In the present invention, the "electric line" including the bus M and the like is a conductor through which electricity is passed, such as copper, aluminum, silver, gold, and nichrome, and a cable in which this conductor is covered with an insulating material. Including general electric wires.

Further, by connecting the power storage unit 5 to the electric path between the grid connection device S and the power generation device 2, even if the power generation amount of the power generation device 2 is increased beyond the power consumption D that can be consumed by the load F, the load F The power storage unit 5 can store the power that cannot be consumed by the power storage unit 5, and both "increase in power generation amount" and "power loss" can be achieved.

Then, when the power generation H is lowered, the control unit 9 once generates a value at which the power generation H is zero and / or a value lower than the power consumption D of the load F when the power generation H is lowered. By setting the target value TH of the force H, unlike Patent Document 2, the actual decrease in the power generation H is not delayed, and the power generation H is less likely to be larger than the power consumption D of the load F. It is possible to suppress the generation (power that cannot be consumed by the load F flows to the system K) (“suppression of reverse power generation”).

The power generation device 2 according to the present invention is input from a power generation unit 6 that generates electric power, a power conditioner 7 that converts a DC current or an AC current from the power generation unit 6 into an AC current, and the power conditioner 7. A power generation device including a transformer 8 that transforms an AC current into a higher-pressure AC current, and a control unit 9 that controls a higher-pressure AC current from the transformer 8 as a power generation H output from the power generation device 2. The control unit 9 is lower than the value at which the power generation H is set to zero when the power generation H is lowered and / or the power consumption D of the load F when the power generation H is lowered. The first feature is that the value is once set to the target value TH of the power generation H.

Due to this feature, when the power generation H is lowered, the control unit 9 once sets a value at which the power generation H is zero and / or a value lower than the power consumption D of the load F when the power generation H is lowered. Is the target value TH of the power generation H, and unlike Patent Document 2, the actual decrease in the power generation H is not delayed, and the power generation H is less likely to be larger than the power consumption D of the load F. It is possible to suppress the generation of reverse power (power that cannot be consumed by the load F flows to the system K) (“suppression of reverse power generation”).

The power generation connection board 4 according to the present invention is a power generation connection board in which the power generation connection device 3 for connecting the power generation device 2 to the system connection device S and the load F connected to the system K is built in the board housing 4'. As the power generation connection device 3, the reverse power relay 10 for detecting the reverse power G flowing back from the system connection device S to the system K and the receiving power J for measuring the received power J received from the system K to the system connection device S. The first feature is that the power meter 11 and the power generation meter 12 for measuring the power generation H output from the power generation device 2 are provided.

Due to this feature, the reverse power relay 10, the power receiving meter 11, and the power generation meter 12 are built in the power generation connection board 4, so that the board housing 4'of the power generation connection board 4 is replaced with the board housing U'of the system board U. Since it is possible to easily suppress the reverse power G required when the power generation device 2 is added (expanded) and to use the received power J and the generated power H (use for control, etc.) simply by attaching to the power generation device 2, " It is possible to reduce costs, construction period, and power outage period.
At the same time, if the board housing 4'of the power generation connection board 4 is attached to the board housing U'of the system board U, unlike Patent Document 1, even if the power generation device 2 is added (expanded), the power generation is added. Since it is not necessary to separately create a foundation for installing the device 2 or to match the level of the created foundation with the existing foundation N, it also means that "reduction of cost, construction period and power outage period" can be achieved.
If the power generation connection device 3 built in the power generation connection board 4 is connected to the bus line M, the power generation connection board 4 connects the power generation connection device 3 at a high voltage such as 6600V (in other words,). It can be said that it is a "high-voltage branch board" because it has a branch line 20 that branches off from the bus line M), and since the power generation connection board 4 can be retrofitted (added) to the existing system board U (power purchase board) or the like. , It can be said that it is an "expansion type high voltage branch board".

According to the power system, the power generation device, and the power generation connection board according to the present invention, the board housing of the power generation connection board in which the power generation connection device is built can be attached to the board housing of the system board in which the system connection device is built. When lowering the power generation, by temporarily setting the value to zero the power generation as the target value of the power generation, "reduction of cost, construction period and power outage period" and "suppression of reverse power" can be achieved. realizable.

It is a schematic diagram which shows the electric power system which concerns on this invention, a power generation apparatus, and a power generation connection board. It is a figure which shows the power generation connection board which concerns on this invention, (a) shows the front view, (b) shows the side view, (c) is the XX arrow view in (a) and power generation connection. A plan sectional view of the lower part of the board in the vertical direction is shown. It is a front schematic diagram which shows the state which the power generation connection board which concerns on this invention is attached to a system board. It is a graph which illustrates the change of the received power (when the received power is a negative value, the occurrence of reverse power), the power generation, the power consumption of a load, and the target value of the power generation in the power system according to the present invention. When the power consumption that can be consumed by the load in the power system according to the present invention is constant and the power generation of the power generation device is increased, the amount of power generated by the power generation device for one year and the amount of power consumption that the load can consume in one year are determined. It is an example graph.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Power system 1>
FIGS. 1 and 3 show the electric power system 1 according to the present invention.
This power system 1 includes a system board U and a load F in which a system connection device S connected to the system K described later is built, and a power generation connection board 4 in which a power generation device 2 and a power generation connection device 3 to be described later are built. Have.
The following first describes the system K, the system board U incorporating the system connection device S, the load F, and the like.

<System K>
As shown in FIG. 1, the system K is also called a commercial power system, and is a system that integrates power generation, substation, power transmission, and distribution for supplying electric power to a consumer's power receiving equipment.
The system K is a three-phase three-wire system (3φ3W) and supplies electric power of 6600V, 22000V, etc., 60Hz, 50Hz, etc. from a substation of an electric power company. After the pole transformer, electric power such as single-phase two-wire (1φ2W) or 1φ3W (single-phase three-wire) may be supplied.

<System connection device S, system board U, bus circuit M>
As shown in FIGS. 1 and 3, the system connection device S is a device connected to the system K described above, and the system connection device S is a board housing (system board housing) U'of the system board U. Built into.
The system connection device S may have any configuration as long as it is connected to the system K and built in the system panel housing U', but for example, a circuit breaker (VCB) or the like is used. A so-called system circuit breaker or high-voltage circuit breaker) S1, a lightning arrester (SAR), an instrument transformer (VT, Voltage Transformer, so-called voltage transformer) S2, or the like may be provided.

The system circuit breaker S1 in the system connection device S may be configured to cut off a signal from a control unit 9 (or a reverse power relay 10 described later) described later via a trip coil or the like.
Since such a system circuit breaker S1 is provided in the system board U (system board housing U'), the electric circuit in the system board U from the power generation device 2 to the system K (the system of the bus electric circuit M). The electric circuit in the board U) will be cut off.

Here, the bus electric circuit M is an electric circuit connecting between the system connection device S and the load F described later, and the potential in the bus electric circuit M is the same as the electric potential in the system K (6600V, 22000V, etc.). If the load F described later has a transformer (step-down transformer) F1, the electric circuit connecting the transformer F1 (high-voltage side) and the system connection device S is a bus electric circuit M. It can be said that there is.
A power generation connection device 3 (particularly, a branch electric circuit 20) described later may be connected to the bus electric circuit M.

The instrument transformer S2 in the system connection device S is located closer to the system K (closer to the system K) than the above-mentioned system circuit breaker S1 in the electric circuit between the power generation device 2 and the system K, which will be described later, and in the system panel U. It is installed in the electric circuit.
In such an instrument transformer S2, the high-voltage side thereof is an electric circuit closer to the system K (closer to the system K) than the system circuit breaker S1 and a branch electric circuit (transformed branch) from the branch point (transformed branch point) S3 in the electric circuit. (Electrical circuit) It is connected via S4, and the low voltage side of the instrument transformer S2 is connected to the reverse power relay 10, the power receiving meter 11, and the power generating meter 12, which will be described later.

The configuration of the instrument transformer S2 in the system connection device S is also not particularly limited, but may be, for example, a configuration in which 6600V, 22000V, etc. are stepped down to 110V or the like.
In the system connection device S, a high-pressure current limiting fuse (PF, Power Fuse) may be provided in the electric path between the instrument transformer S2 and the transformation branch point S3.

<Other devices in grid connection device S>
As shown in FIG. 1, other system connection devices S include a circuit breaker (so-called high-voltage switch) S5, an instrument current transformer (so-called high-voltage system current transformer) S6, and a current transformer for instruments. A current transformer (so-called high-voltage modified voltage current transformer) S7 may be provided.
In addition, the system connection device S is provided with an undervoltage relay, an overvoltage relay, an undervoltage relay (also referred to as a frequency-decreasing relay), an overfrequency relay, a watt-hour meter, and a pillar-mounted air switch. You may be.

The disconnector (DS, Disconnecting Switch) S5 in the system connection device S is a device that opens and closes the circuit in the power system 1 and the circuit in the power system 1 in a state where no current is flowing, and the disconnector S5 Does not have a function of cutting off the current, and opens and closes the disconnector after cutting off the current with another circuit breaker (system circuit breaker S1, power generation circuit breaker 21, etc.).
The disconnector S5 may have any configuration as long as the circuit can be opened and closed while no current is flowing. For example, the disconnector S5 has a branch point (transformation branch point) S3 to the instrument transformer S2 described above. It may be provided in the electric circuit between the system K.

The current transformer (CT) S6 in the system connection device S is an electric circuit between the power generation device 2 and the system K, which will be described later, and in the system board U (the electric circuit in the system board U of the bus bar M). In the above-mentioned system breaker S1, it is provided in the electric circuit closer to the power generation device 2 (the side closer to the power generation device 2).
The configuration of such an instrument current transformer S6 is also not particularly limited, but for example, the output side of the instrument current transformer S6 is directly connected to the reverse power relay 10 or the power receiving meter 11 described later, or The current transformer S6 for an instrument may be connected to the reverse power relay 10 or the power receiving meter 11 via an ammeter (so-called power receiving ammeter) or the like.

The instrument transformer (VCT, Combined Voltage and Current Transformer) S7 in the grid connection device S is a device that combines an instrument transformer (VT) and an instrument transformer (CT) into one. It is a device that measures the current and voltage that flows from the system K into the system connection device S (or flows out to the system K), and the power meter is combined with the above-mentioned instrument transformer current transformer S7 and is used from the system K. It is a device that measures the amount of power that flows into the system connection device S (or flows out from the system connection device S to the system K), and can be said to be a trading meter.
The instrument transformer S7 may have any configuration as long as it can measure the current and voltage flowing from the system K to the system panel U. For example, the instrument transformer S7 has a configuration. It may be provided in the electric circuit between the disconnector S5 and the system K described above.

In addition, when the system connection device S is provided with an undervoltage relay, this undervoltage relay (UVR, Under Voltage Relay) is a relay that detects the undervoltage, and if it can detect the undervoltage, any of them. However, for example, it may be connected to the low voltage side of the instrument transformer S2 described above.
When the undervoltage detected by the undervoltage relay breaker becomes equal to or less than a predetermined value (a value obtained by subtracting a predetermined voltage (for example, 100V, 200V, etc.) from 6600V, 22000V, etc.), the above-mentioned power generation is performed by the control unit 9 described later. Any circuit breaker (system circuit breaker S1, power generation circuit breaker 21, etc.) from the device 2 to the system K may be interrupted, but this circuit breaker has priority over the case where the reverse power generation state C1 described later is reached. It can be said that the degree is low.
When the undervoltage relay detects an undervoltage, when the above-mentioned circuit breaker is cut off by hardware (for example, via a trip coil or the like), the undervoltage relay itself is a control unit described later. It can be said that it is 9.

When the grid connection device S is provided with an overvoltage relay, this overvoltage relay (OVR, Over Voltage Relay) is a relay that detects overvoltage, and any configuration can be used as long as it can detect overvoltage. It may be good, but for example, it may be connected to the low voltage side of the instrument transformer S2 described above.
When the overvoltage detected by the overvoltage relay exceeds a predetermined value (a value obtained by adding a predetermined voltage (for example, 100V, 200V, etc.) from 6600V, 22000V, etc.), the power generation device 2 described above is operated by the control unit 9 described later. Any circuit breaker from to system K may be cut off, but it can be said that this cutoff also has a lower priority than the case where the reverse power generation state C1 described later is reached.
When an overvoltage is detected by the overvoltage relay and the above-mentioned circuit breaker is cut off by hardware, it can be said that the overvoltage relay itself is the control unit 9 described later.

When the grid connection device S is provided with a shortage frequency relay, this shortage frequency relay (UFR, Under Frequency Relay) is a relay that detects the shortage frequency, and any configuration can be used as long as the shortage frequency can be detected. However, for example, it may be connected to the low pressure side of the instrument transformer S2 described above.
Insufficient frequency When the insufficient frequency detected by the relay becomes less than or equal to a predetermined value (a value obtained by subtracting a predetermined frequency (for example, 1 Hz or more and 10 Hz or less) from 60 Hz, 50 Hz, etc.) Any circuit breaker from the power generation device 2 to the system K may be cut off, but it can be said that this cutoff also has a lower priority than the case where the reverse power generation state C1 described later is reached.
When the shortage frequency is detected by the shortage frequency relay and the above-mentioned circuit breaker is cut off by hardware, it can be said that the shortage frequency relay itself is the control unit 9 described later.

When the grid connection device S is provided with an overfrequency relay, this overfrequency relay (OFR, Over Frequency Relay) is a relay that detects overfrequency, and any configuration can be used as long as it can detect overfrequency. However, for example, it may be connected to the low pressure side of the instrument transformer S2 described above.
When the overfrequency detected by the overfrequency relay exceeds a predetermined value (a value obtained by adding a predetermined frequency (for example, 1 Hz or more and 10 Hz or less) from 60 Hz, 50 Hz, etc.), the control unit 9 described later describes the above. Any circuit breaker from the power generation device 2 to the system K may be cut off, but it can be said that this cutoff also has a lower priority than the case where the reverse power generation state C1 described later is reached.
When an overfrequency is detected by the overfrequency relay and the above-mentioned circuit breaker is cut off by hardware, it can be said that the overfrequency relay itself is also a control unit 9 described later.

When the grid connection device S is provided with a watt-hour meter, the watt-hour meter may have any configuration as long as it can measure the amount of current when flowing from the grid K to the grid board U. Is connected to the instrument transformer transformer S7, for example, the measured values of the current and the voltage output from the instrument transformer transformer S7 are input, and the value obtained by multiplying these currents and voltages (voltage and current). The amount of power may be measured by integrating the product of).
Here, it can be said that the watt-hour meter is for purchasing power when measuring the amount of power flowing from the system K to the system board U, and conversely, when measuring the amount of power flowing out from the system connection device S to the system K. It can be said that it is for selling electricity. It should be noted that this watt-hour meter may be a Class B electrical appliance specified by the Electrical Appliance and Material Safety Law.

When the system connection device S is provided with a pole air switch, this pole air switch (PAS, Pole Air Switches) is used to open / close the demarcation point of responsibility between the power system 1 and the system K. It is a device.
The pole-mounted air switch may have any configuration as long as it can open and close the demarcation point of responsibility between the power system 1 and the system K. For example, the pole transformer S7 and the system may be configured. It may be provided in the electric circuit between K.

<System board U board housing (system board housing) U'>
As shown in FIGS. 1 and 3, the system board housing U'is a housing incorporating the system connection device S described above, and is a system K in one power system 1 (or a power generation device 2 described later). It can be said that there is only one (there is only one system board U) because it is connected to.
The system board housing U'may have any configuration as long as it incorporates the system connection device S. For example, the system board housing U'may be formed in a substantially rectangular shape as a whole, and other system board housings. The volume (volume on the outer surface) and volume (volume on the inner surface) of the body U'may be larger than the volume and volume of the power generation connection board housing 4'described later (note that in FIG. 1, the system board is for convenience. The volume and volume of the housing U'is displayed smaller than the volume and volume of the power generation connection board housing 4').

When the entire system board housing U'is substantially rectangular parallelepiped, the system board housing U'has doors (front) that can be opened and closed on its side materials (front material, rear surface material, left surface material, right surface material, etc.). Doors, etc.) may be provided.
Further, the system board housing U'may have a ceiling surface material, a floor surface material, and the like in addition to the side material.

The "front and back" in the substantially rectangular parallelepiped system board housing U'refers to the side with the door as "front" and the side opposite to the side with the door as "rear" (there are doors in front and behind). In that case, the side with one of the doors is the "front").
Further, "left and right" in the system board housing U'means the left hand side when the user who has entered the system board housing U'turns from "rear" to "front" in the system board housing U'. Is "left", and the right hand side when facing from "rear" to "front" is "right".

The side material and ceiling surface material of the system board housing U'correspond to the rear through hole 4a'of the rear surface material in the board housing 4'of the power generation connection board 4, which will be described later, and the opening on the rear surface (substantially the same). It may have through holes Ua'or openings (which are number, size, and shape).
Of course, these through holes Ua'and openings are not provided in the existing system board housing U', but when the power generation connection board housing 4'is attached, the power generation connection board housing 4 is attached. It may be provided according to the'rear surface through hole 4a'and the opening, but it may be made as small as possible.

At least one of the side materials (front material, rear surface material, left surface material, right surface material, etc.) and ceiling surface material of the system panel housing U'is a power generation connection panel housing 4'(especially the rear surface side) described later. It is attached.
At least one of the side members (front material, rear surface material, left surface material, right surface material, etc.) of the system board housing U'may be wider than the rear surface material of the power generation connection board housing 4'described later, and the system board housing The ceiling surface material of the body U'may be the same size as the rear surface material of the power generation connection board housing 4', or may be wider than the rear surface material.
Even if the volume or volume of the system board housing U'is smaller than the volume or volume of the power generation connection board housing 4'described later, at least the side material or ceiling surface material of the system board housing U' One may be wider than the rear surface material of the power generation connection board housing 4'described later.
Only one power generation connection board housing 4'described later may be attached to one system board housing U', or a plurality of power generation connection board housings 4'are one system board housing U'. It may be attached to.

A hook that can be lifted by a crane or the like may be provided on the outer surface of the ceiling surface material of the system board housing U', and the entire system board housing U'lifted via this hook is constructed in advance. (Base) It may be installed (installed) on N.
The foundation N may be made of any material such as concrete or steel (H steel), and its shape may be a solid foundation having a uniform thickness or a space below the floor material of the system board housing U'. It may be a geta foundation having a dent or the like so as to form.

<Load F>
As shown in FIG. 1, the load F is a device that consumes the received power J from the system K via the system board U, the generated power H output from the power generation device 2, and the like, and such a load. Let the power consumed by F be the load power (which can also be said to be power consumption) D.
The load F may have any configuration as long as it consumes the received power J and the generated power H. For example, the load F may be a lighting (light load equipment) F in a factory or an industrial motor (IM) in a factory. , Industrial Motor, power load equipment) F, or an illumination distribution board connected to a plurality of the above-mentioned illuminations F.

The load F may be a device in a factory, an air conditioner in a building such as a house or a building, a fluorescent lamp, a home appliance, a vehicle such as an electric vehicle or a gasoline vehicle, or a device in the vehicle.
In addition, the load F is a transformer (so-called step-down transformer, electric light transformer, etc.) that transforms (steps down) the power received J from the system K via the system connection device S and the power generated H from the power generation device 2. Power transformer) F1 or a high-voltage AC load switch (LBS, Load Break Switch) F2 in the bus M between this transformer F1 and the system connection device S, or a transformer F1 A wiring breaker (MCCB, Molded Case Circuit Break) F3 may be provided in an electric circuit or the like between the above-mentioned industrial motor (or lighting) F and the above-mentioned industrial motor (or lighting) F.
The high-voltage AC load switch F2 may have a fuse such as a high-voltage current limiting fuse.

The configuration of the transformer F1 in the load F is also not particularly limited, but for example, in the case of an industrial motor (for power), 6600V, 22000V, etc. are stepped down to 440V, 210V, etc. with a three-phase three-wire (3φ3W). If it is for lighting (for electric lamps), it may be configured to step down 6600V, 22000V, etc. to 105V or more and 210V or less with a single-phase three-wire (1φ3W).
The load F does not have to be provided with such a transformer F1. In this case, another transformer is provided on the system panel U side, or the output from the power generation device 2 is transmitted via the transformer F1. It may be configured to be directly connected to the load F without any trouble.

<Power consumption (load power) D of load F, its calculation and change>
The power consumed by the entire load F is the load power D, which is consumed not only by the total power consumed by each load F itself, but also by the power loss in the transformer F1 and in the lighting distribution board. In addition to this, cable loss (power loss in the cable connecting each device), air conditioning loss (power loss due to air conditioning in the system board U described above and the switchboard 30 described later), etc. The loss power during power generation may also be included in the load power D.
The number of loads F may be one or more, but even if the load F is one, if the transformer F1 is also possessed, the power including the power loss is the load. It becomes electric power D.

In this way, it is difficult in terms of hardware to directly measure the power consumption of one or more loads F and calculate the total load power D including the power loss, and the load is accurate. It can be said that it is difficult to measure the power D.
Therefore, by calculating the load power D from the sum of the received power J and the generated power H, it is not necessary to directly measure the load power D, and the measurement of the received power J and the generated power H has a simple hardware structure. It can be said that it is easy to measure and the accuracy is improved.
The power receiving meter 11 and the power generation meter 12 for measuring the received power J and the generated power H, which are the basis for calculating the load power D, will be described in detail later.

The power consumption (load power) D of the load F varies depending on the time of day, night, etc., and the type and number of the power load equipment F used in the factory, etc. Since it changes depending on the purpose of the work and the like, the load power D naturally changes such as decreasing or increasing.
The power generation device 2 can generate power H or the like that is as close as possible to the load power D that changes in this way (in other words, the control unit 9 described later makes the limiting coefficient A (t) as close to 100% as possible). For example, it is desirable that the received power (power to be purchased) J is suppressed as much as possible (cost can be reduced).

On the other hand, as shown in FIG. 4, when the power generation device 2 is generating power generation H or the like as close as possible to the load power D, when the load power D decreases, the power conditioner 7 is controlled to generate power. Even if the target value TH of the power generation H that lowers the force H is given, the actual power generation H does not decrease immediately (the decrease in the power generation H is delayed), so the power generation H is greater than the load power D by the delay. It is necessary to prevent the reverse power G from being generated (power that cannot be consumed by the load F flows into the system K).
The power generation connection board 4 incorporating the power generation connection device 3 for connecting the power generation device 2 described later to the load F and the system connection device S described so far will be described below.

<Power generation connection device 3, power generation connection board 4>
As shown in FIGS. 1 to 3, the power generation connection device 3 is a device for connecting the power generation device 2 described later to the system connection device S and the load F described above.
The power generation connection board 4 according to the present invention has a power generation connection device 3 built in the board housing (power generation connection board housing) 4', and is contained in the power generation connection board 4 (power generation connection board housing 4'). Is a device necessary for connecting the power generation device 2 to the grid connection device S and the load F and performing "self-consumption" in which the user of the power system 1 consumes the power generated by the power generation device 2 by the load F. It can be said that they are aggregating.
The power generation connection device 3 may have any configuration as long as the power generation device 2 is connected to the system connection device S and the load F and is built in the power generation connection panel housing 4'. For example, the power generation connection device 3 may be branched. The electric circuit 20, the reverse power relay 10, the power receiving meter 11, the power generation meter 12, the power generation breaker 21, the current transformer for the instrument (so-called current transformer) 22, and the like may be provided.

<Branch line 20>
As shown in FIG. 1, the branch electric circuit 20 is an electric circuit that enables the power generation device 2 described later to be connected to the above-mentioned system connection device S and load F. For example, the material thereof is a vinyl insulated wire for electric device or the like. It may be.
As described above, the branch electric circuit 20 (in other words, the power generation connection device 3) may be connected to the bus electric circuit M. In this case, the electric potential in the branch electric circuit 20 is the electric potential in the bus electric circuit M or the system K. The same high voltage (6600V, 22000V, etc.) is obtained. Therefore, even if the distance between the system board U or the load F and the power generation device 2 is long (even if the distance is long), the branch electric circuit 20 has a high voltage, so that cable loss can be reduced and power generation can be performed. The installation location of the device 2 can be selected (the choice of installation location increases).

The branch electric circuit 20 may have not only a portion located in the power generation connection board housing 4'but also a portion protruding from the power generation connection board housing 4'.
Further, one end side of the branch electric circuit 20 is connected to the bus electric circuit M (an electric circuit at any position between S and F), and the other end side of the branch electric circuit 20 is the output side (transformer 8) of the power generation device 2. It may be connected to the output side (high voltage side) of.

<Reverse power relay 10, reverse power G>
As shown in FIGS. 1 and 2, the reverse power relay (RPR, Reverse Power Relay) 10 is a relay that detects the reverse power G, and is built in the power generation connection panel 4.
Here, the reverse power G is the power that flows back from the system connection device S described above to the system K, and can also be said to be the backflow power G.

The reverse power relay 10 may have any configuration as long as it can detect the reverse power G. For example, the reverse power relay 10 can be connected to the low voltage side of the instrument transformer S2 built in the system board U described above. Moreover, it may be built in the power generation connection board 4 in a state where it can be connected to the output side of the instrument transformer S6 built in the system board U described above.
When the reverse power G detected by the reverse power relay 10 becomes larger than 0 (so-called "reverse power generation state C1"), the control unit 9 described later causes any of the power generation devices 2 to the system K described later. The circuit breaker (power generation circuit breaker 21, system circuit breaker S1, etc.) may be cut off, or the conversion of the power conditioner 7 described later may be stopped.

When the reverse power G is detected by the reverse power relay 10, when the above-mentioned circuit breaker is cut off in terms of hardware (for example, via a trip coil or the like), the reverse power relay 10 itself will be described later. It can also be said that the control unit 9 is used.
Here, "the reverse power G becomes larger than 0" in the present invention means that the reverse power G is strictly larger than 0 W (0 mW, 0 μW, etc.) (naturally, does not include 0 W). Depending on the resolution and settings of the reverse power relay 10 used, it is permissible to mean that the reverse power G is "greater than 0W" and "less than or equal to a value that can be regarded as 0W", and can be regarded as "0W" in the present invention. The “value” may be set according to the resolution of the reverse power relay 10 to be used, a predetermined value of insufficient power, or the like, and may be, for example, 1 mW, 1 μW, 1 nW, or the like.

In addition, the "reverse power generation state C1" in the present invention means that, for example, 2 to 10% or more (5% or more, etc.) of the power flowing from the system K to the system connection device S (received power J described later) is, for example. It may mean the case where the power flows back from the system connection device S to the system K for 1 to 2 seconds or more (2 seconds or more, etc.).
For example, when the current value of the power of the three-phase three-wire flowing (received) from the system K to the system connection device S is 50 A and the voltage value is 6600 V, the received power J is √3 × 50 × 6600. = 571576.766 ... W ≈ 571.6 kW, and 5% of this received power J is 571.6 kW × 0.05 ≈ 28.6 kW. Therefore, the reverse power G of 28.6 kW or more is 2 It can be said that the "reverse power generation state C1" is reached when the power is generated for more than a second.
Even if the reverse power relay 10 is integrated with the power receiving meter 11 described later or is built in the power receiving meter 11 (in other words, the power receiving meter 11 functions as the reverse power relay 10). (Even if it is built-in), even in these cases, a device in which the reverse power relay 10 and the power receiving meter 11 are integrated, and a power receiving meter 11 having a built-in reverse power relay 10 are built in the power generation connection board 4. If so, the reverse power relay 10 is still built in the power generation connection panel 4 (similar to the case where the reverse power relay 10 and the power receiving meter 11 are separately provided).

<Power receiving meter 11, power receiving J>
As shown in FIGS. 1 and 2, the power receiving meter 11 is a power meter for measuring the received power J, and is built in the power generation connection board 4.
Here, the received power J is the power received from the system K described above to the system connection device S, and can also be said to be the received power J.

The power receiving meter 11 may have any configuration as long as it can measure the receiving power J. For example, the power receiving meter 11 can be connected to the low voltage side of the instrument transformer S2 built in the system board U described above. Moreover, it may be built in the power generation connection board 4 in a state where it can be connected to the output side of the instrument transformer S6 built in the system board U described above.
Such a power receiving meter 11 is, for example, an overcurrent relay (OCR, Over Current Relay, so to speak, power receiving OCR) connected to the output side of the current transformer S6 for the instrument in the system connection device S described above, or an instrument. An ammeter (so-called power receiving ammeter) connected to the output side of the current transformer S6, and a wattmeter (receiver in a narrow sense) connected to the output side of this ammeter and the low pressure side of the above-mentioned current transformer S2. It can also be said to be an ammeter), and may also have an output unit that digitizes the measured value from this ammeter and outputs it to the control unit 9.

In addition, the power receiving meter 11 may have a power receiving panel 11a exposed to the outside of the power generation connection panel housing 4'and displaying the measured power receiving J.
The output from the power conditioner 7 described later is controlled by the control unit 9 described later based on the value of the received power J measured by the power receiving meter 11 and the power generation H measured by the power generation meter 12 described later. Will be done. When the control unit 9 is provided inside the switchboard 30 or the like described later, the value of the power reception J measured by the power reception meter 11 is the control unit 9 by wire or wirelessly by the communication cable 25 or the like. It may be output to.
Even if the power receiving meter 11 is integrated with the reverse power relay 10 described above or is built in the reverse power relay 10 (in other words, the reverse power relay 10 functions as the power receiving meter 11). Even in these cases, a device in which the power receiving meter 11 and the reverse power relay 10 are integrated, and the reverse power relay 10 having the power receiving meter 11 built in are built in the power generation connection board 4. If so, the power receiving meter 11 is still built in the power generation connection board 4 (similar to the case where the power receiving meter 11 and the reverse power relay 10 are separately provided).

<Power generation meter 12, power generation H>
As shown in FIGS. 1 and 2, the power generation meter 12 is a power meter that measures the power generation H, and is built in the power generation connection panel 4 described later.
Here, the generated power H is the power output from the power generation device 2 described later, and can be said to be the generated power H.

The power generation meter 12 may have any configuration as long as it can measure the power generation H. For example, the power generation meter 12 can be connected to the low voltage side of the instrument transformer S2 built in the system board U described above. Moreover, it may be built in the power generation connection board 4 in a state of being connected to the output side of the current generation transformer 22 provided in the branch electric circuit 20 in the power generation connection board 4.
Such a wattmeter 12 is, for example, an overcurrent relay (OCR, Over Current Relay, so to speak, power generation OCR) connected to a current generation transformer 22 described later, or an ammeter connected to the overcurrent relay. (So-called power generation ammeter), a wattmeter connected to the output side of this ammeter and the low-voltage side of the instrument transformer S2 described above (also called a wattmeter in a narrow sense), and the measured values from this wattmeter. The configuration may also include an output unit that is digitized and output to the control unit 9.

In addition, the power generation meter 12 may have a power generation panel 12a exposed to the outside of the power generation connection panel housing 4'and displaying the measured power generation H.
Based on the value of the power generation H measured by the power generation meter 12 and the power reception J measured by the power reception meter 11 described above, the output from the power conditioner 7 described later is controlled by the control unit 9 described later. Will be done.
The output side (high voltage side) of the transformer 8 in the power generation device 2 described later is connected to the branch electric circuit 20 described above. In this case, the measured value of the power generation meter 12 which is the output from the transformer 8. Is (considered) the generated power H output from the power generation device 2.
When the control unit 9 is provided inside the switchboard 30 or the like, which will be described later, the value of the power generation H measured by the power generation meter 12 is the control unit 9 by wire or wirelessly by the communication cable 25 or the like. It may be output to.

<Circuit breaker (power generation circuit breaker) 21>
As shown in FIGS. 1 and 2, the power generation circuit breaker 21 is a high-pressure AC load switch (LBS, Load Break) that cuts off the branch electric circuit 20 (that is, between the power generation device 2 and the system K) in the power generation connection panel 4. Switch) and other circuit breakers.
The power generation circuit breaker 21 may have any configuration as long as it cuts off the branch electric circuit 20, but for example, it may be rotatable in the front-rear direction in order to improve maintainability, which will be described later. The signal from the control unit 9 (or the reverse power relay 10) may be cut off via a capacitor tripping power supply device 23, which will be described later, a tripping coil, or the like.

Since such a power generation circuit breaker 21 is provided in the power generation connection board 4 (power generation connection board housing 4'), the power generation connection board housing 4'is simply attached to the system board housing U'. A circuit breaker that cuts off the branch electric circuit 20 will also be installed.
By shutting off the power generation circuit breaker 21 and the system circuit breaker S1 described above, it can be said that the power generation H is not output from the power generation device 2 or the current does not flow from the system connection device S to the system K.

<Instrument transformer (current transformer) 22>
As shown in FIGS. 1 and 2, the current transformer (CT) 22 for an instrument is a branch electric circuit 20 and an electric circuit in the power generation connection board 4 (the electric circuit in the power generation connection board 4 in the branch electric circuit 20). The electric circuit is provided on the side closer to the system K (the side farther from the power generation device 2) than the power generation breaker 21 described above.
The configuration of such a power generation transformer 22 is also not particularly limited, but for example, the output side of the current generation transformer 22 is directly connected to the above-mentioned power generation meter 12, or the current generation transformer 22 is used. It may be connected to the power generation meter 12 via an ammeter (so-called power generation ammeter) or the like.
Note that FIG. 2 shows a case where electric power (R phase, S phase, T phase) of three phases and three lines flows through the branch electric circuit 20. In this case, two phases (for example, R phase) out of the three phases are shown. The current generation transformer 22 may be provided only on the (phase, T-phase) line.

<Other devices in power generation connection device 3>
As shown in FIGS. 1 and 2, the power generation connection device 3 may also be provided with a capacitor stripping power supply device 23 and a cable bracket 24.
Furthermore, the power generation connection device 3 may be provided with an insufficient power relay.

The capacitor tripping power supply device (CTD, Condenser Trip Device) 23 in the power generation connection device 3 uses the energy generated when the AC input voltage is rectified and discharged to the capacitor to pull a high-pressure AC load switch or a vacuum breaker. It is a device for removing the capacitor, and the power generation device 23 for removing the capacitor cuts off the branch electric circuit 20 at the power generation breaker 21 described above.
In this case, it can be said that the capacitor stripping power supply device 23 receives a signal from the control unit 9 (or the reverse power relay 10) described later and cuts off the branch electric circuit 20 by the power generation circuit breaker 21.

In addition, when the power generation connection device 3 is provided with a shortage power relay, this shortage power relay (UPR, Under Power Relay) is a relay that detects the shortage power.
Here, the insufficient power is the power representing the shortage of the received power J at the system connection device (system connection end) S when a short circuit occurs on the system K side described above, and is described above. It can be said that when the generated power H from the power generation device 2 becomes too large, the insufficient power approaches zero.
The insufficient power relay may have any configuration as long as it can detect the insufficient power. For example, the insufficient power relay can be connected to the low voltage side of the instrument transformer S2 built in the system board U described above, and can be connected to the low voltage side. It may be built in the power generation connection board 4 in a state where it can be connected to the output side of the instrument transformer S6 built in the system board U described above.
When the shortage power detected by the shortage power relay approaches 0 (so-called "when the shortage power becomes almost zero"), the control unit 9 described later stops the conversion of the power conditioner 7 described above, or the above-mentioned Any circuit breaker (power generation circuit breaker 21, system circuit breaker S1, etc.) in the electric circuit from the power generation device 2 to the system K may be cut off.
When the shortage power detected by the shortage power relay approaches 0 and the above-mentioned circuit breaker is cut off in terms of hardware (for example, via a trip coil or the like), the shortage power relay itself is used. It can also be said that the control unit 9 will be described later.
Here, "the shortage power approaches 0 (zero)" in the present invention means that the shortage power is "greater than 0W (watt) (that is, does not include 0W)" and "is equal to or less than the value near 0W". This means that the "value near 0 W" in the present invention may be a value larger than 0 W, and may be set to a predetermined insufficient power value according to the resolution of the insufficient power relay to be used. It does not matter, and may be, for example, 1 kW (1000 W), 1 W, 1 mW, 1 μW, or the like.

<Board of power generation connection board 4 (power generation connection board housing) 4'>
As shown in FIGS. 1 to 3, the power generation connection board housing 4'is a housing in which the power generation connection device 3 described above is built, and there is only one in one power system 1 (power generation connection board). There may be only one 4 (there is only one), but there may be a plurality (there are a plurality of power generation connection boards 4).
The power generation connection board housing 4'may have any configuration as long as it incorporates the power generation connection device 3, but for example, it may be formed in a substantially rectangular shape as a whole, and other power generation connections. The volume (volume on the outer surface) and volume (volume on the inner surface) of the board housing 4'may be smaller than the volume and volume of the system board housing U'described above (note that in FIG. 1, power is generated for convenience). The volume and volume of the connection board housing 4'shows a larger volume and volume of the system board housing U').

When the entire power generation connection board housing 4'has a substantially rectangular parallelepiped shape, the power generation connection board housing 4'is used as a side material (especially the front material among the front material, the rear surface material, the left surface material, the right surface material, etc.). Does not have to be provided with a door that can be opened and closed. In addition, a door that can be opened and closed (front door, etc.) is provided, and the front surface of the power generation connection panel housing 4'is a door that can be opened and closed. Is also good.
Further, the power generation connection board housing 4'may have a ceiling surface material (upper surface material), a floor surface material (lower surface material), and the like in addition to the side surface material.

The "front and back" of the substantially rectangular parallelepiped power generation connection panel housing 4'refers to the side where the power receiving meter panel 11a and the power generation panel 12 are exposed (or the side where the door is located) as the "front". The other side is "rear".
Further, the "left and right" in the power generation connection board housing 4'are also when the user who entered the power generation connection board housing 4'turns from "rear" to "front" in the power generation connection board housing 4'. The left hand side is "left", and the right hand side when facing from "rear" to "front" is "right".

The rear surface material of the power generation connection board housing 4'may be provided with a rear surface through hole 4a'.
The rear through hole 4a'is used to insert the above-mentioned branch electric circuit 20 or to connect the reverse power relay 10, the power receiving meter 11, the power generating meter 12, etc. to the low pressure side of the instrument transformer S2. An electric circuit (so-called communication cable), a reverse power relay 10, a power receiving meter 11, a power generating meter 12, etc., and an electric circuit (so-called communication cable) for connecting between the output side of the instrument transformer S6. ) Etc. can be inserted, and any configuration may be used, and the number, size, and shape of the rear through holes 4a'are not particularly limited.

The rear surface of the power generation connection panel housing 4'may be open (has an opening on the rear surface) and communicate with the inside of the system panel housing U'.
The power generation connection board housing 4'(particularly, the rear surface side) is used as at least one of the side materials (front material, rear face material, left face material, right face material, etc.) and ceiling face material of the system board housing U'described above. It is attached.

The rear surface material of the power generation connection board housing 4'may be narrower than at least one of the side materials (front surface material, rear surface material, left face material, right face material, etc.) of the system board housing U'described above, and the power generation connection board housing The rear surface material of the body 4'may have the same size as the ceiling surface material of the system board housing U', or may be wider than the rear surface material.
Even if the volume or volume of the power generation connection board housing 4'is larger than the volume or volume of the system board housing U'described above, the rear surface material of the power generation connection board housing 4'is the system described above. It may be narrower than at least one of the side material and the ceiling surface material of the board housing U'.

The attachment of the power generation connection panel housing 4'to the system panel housing U'is not particularly limited as long as it can be attached. For example, attachment by a fixture (bolt, nut, etc.), welding, adhesion, fitting, etc. The power generation connection board housing 4'may be attached to the system board housing U'.
The power generation connection board housing 4'does not have a foundation constructed in advance, and the lower surface material of the power generation connection board housing 4'floats (away from) the installation surface P of the system board U. You can stay.

The lower surface material of the power generation connection board housing 4'may also be provided with a lower surface through hole 4b'.
The bottom surface through hole 4b'may have any configuration as long as the above-mentioned branch electric line 20 and each communication cable 25 can be inserted, and the number, size, and shape of the bottom surface through hole 4b'are not particularly limited. ..
The cable bracket 24 described above may be provided in the lower surface through hole 4b'.

The size of the power generation connection board housing 4'is also not particularly limited, but when the entire power generation connection board housing 4'is substantially rectangular parallelepiped, for example, the width is 500 mm or more and 900 mm or less, preferably 550 mm or more and 850 mm or less, and further. It may be preferably 600 mm or more and 800 mm or less (700 mm or the like).
In addition, when the entire power generation connection board housing 4'is substantially rectangular parallelepiped, for example, the height may be 900 mm or more and 1500 mm or less, preferably 1000 mm or more and 1400 mm or less, and more preferably 1100 mm or more and 1300 mm or less (1200 mm or the like). The depth may be 200 mm or more and 600 mm or less, preferably 250 mm or more and 550 mm or less, and more preferably 300 mm or more and 500 mm or less (400 mm or the like).

<Power generation device 2>
As shown in FIG. 1, the power generation device 2 according to the present invention is a device that generates power, and its output side is connected to the above-mentioned system connection device S and load F via a power generation connection device 3 described later. It is a possible device.
The configuration of the power generation device 2 is not particularly limited as long as it generates power, but for example, it may be a solar power generation plant (solar power generation device) 2'that generates power with a solar cell 6'described later, or wind power. , A device (wind power generation plant, etc.) that generates electricity with a motor (generator) that is rotated by wave power (tide power), hydraulic power, thermal power, geothermal power, etc., if it is a device that can generate power, only solar cell 6' It may mean any of them.

The motor in the wind power generation plant or the like may be either an AC motor or a DC motor.
The power generation device 2 may include a power generation unit 6, a power conditioner 7, a transformer 8, and a control unit 9.

Such a power generation device 2 is connected to the system connection device S and the load F described above via the power generation connection device 3 built in the power generation connection board 4.
Hereinafter, the power generation device 2 will be described as being mainly a photovoltaic power generation device (photovoltaic power generation plant) 2'.

<Solar power plant 2'etc.>
As shown in FIG. 1, the photovoltaic power plant 2'has a power distribution board 30 including a transformer 8, a switchboard housing 31, a power transmission unit 32, etc., which will be described later, in addition to the power system 1 described above. It doesn't matter.
In the photovoltaic power generation plant 2', the above-mentioned switchboard 30 is connected to the system K having a steel tower, a utility pole, or the like as an end via the above-mentioned power generation connection device 3, the system connection device S, a distribution cable, or the like.

The photovoltaic power generation plant 2'may have a plurality of solar cells 6', a power conditioner 7, a transformer 8, a switchboard 30, and the like.
Further, when there are a plurality of solar cells 6', even if the photovoltaic power plant 2'has a plurality of junction boxes (with a breaker or the like) Z that conduct with each predetermined number of the plurality of solar cells 6'. Regardless, each switchboard 30 is electrically connected to these plurality of junction boxes Z, but the function of the junction box Z may be built in the switchboard 30, and in this case, each switchboard 30 is connected to a plurality of solar cells. It will be directly conductive with every predetermined number of the batteries 6'.

The solar cells 6', the switchboard 30, and the like are arranged according to the size and shape of the land to be installed. For example, the power generation of one switchboard 30 is set to 1500 kW (250 kW per power conditioner). A photovoltaic power generation plant 2'provided with a plurality of switchboards 30 (for example, 30 or more units of 15,000 kW (15 MW) or more, 60 units of 30,000 kW (30 MW) or more) may be used.
The weight of the switchboard 30 is also not particularly limited, but may be, for example, 1 ton or more and 10 tons or less, preferably 1 ton or more and 5 tons or less, and more preferably 1 ton or more and 3 tons or less. It doesn't matter.
Hereinafter, the power generation unit 6 of the power generation device 2 including the photovoltaic power generation plant 2'will be described as being mainly a solar cell 6'.

<Power generation unit 6>
As shown in FIG. 1, the power generation unit 6 is a part that actually generates power, and if the power generation device 2 is a photovoltaic power generation plant 2', the solar cell 6'is the power generation unit 6 and the power generation device. If 2 is a wind power generation plant or the like that generates electricity with a motor rotated by wind power or the like, the motor is the power generation unit 6.

<Solar cell 6'>
As shown in FIG. 1, the solar cell 6'may have a panel shape (flat plate shape) or the like, and when irradiated with light, a direct current is applied between the positive electrode (+ electrode) and the negative electrode (-pole). Electric power is generated, and the average of the generated electric power is 100 W or more and 400 W or less (for example, 250 W).
Of these, the positive pole of one solar cell 6'is connected to the negative pole of another solar cell 6', and the positive pole of another solar cell 6'is connected to the negative pole of another solar cell 6'. Hereinafter, this is repeated, and a plurality of (for example, 5 to 20) solar cells 6'are connected in series to form one solar cell string.

In this way, the voltage between the positive pole (power output end) and the negative pole (ground end) of the entire solar cell string in which a plurality of solar cells 6'are connected in series is generated in each solar cell 6'. It is the sum of the DC voltages, and varies depending on the weather, time, deterioration and failure of each solar cell 6', deviation of the installation position, etc., but it is 200 V or more and 1500 V or less.
The power output from the power output end of the solar cell string is the sum of the powers of each solar cell 6', and 14 solar cells 6'with an output power of 250 W are connected. In the case, 3500W = 3.5kW).

Here, connecting the solar cells 6'in series means that if any one of the solar cells 6'is defective, the current will be cut off in the solar cell 6'. , It becomes difficult to output the electric power generated by another solar cell 6'.
Therefore, by providing a bypass diode (not shown) for each solar cell 6'connected in series, the current is configured to bypass the defective solar cell 6'.

This bypass diode is connected in parallel to the solar cell 6'in the direction in which the current flows from the negative pole to the positive pole. Specifically, the cathode of the bypass diode is the + of the solar cell 6'. Connected to the pole, the anode of the bypass diode is connected to the negative pole of the solar cell 6'.
Such a solar cell 6'may be installed on the installation surface via a gantry.

The installation surface of the solar cell 6'(or pedestal) is the installation surface on which the above-mentioned photovoltaic power generation plant 2'itself is installed, and any surface as long as the solar cell 6'can be installed. However, for example, it may be a golf course site, a mountainous land, a vacant lot, a fallow land, a farmland, etc., a ground with soil, a roof or roof of a building, a wall, or the like.
The installation surface of the solar cell 6'may be the same as the installation surface P or the load F of the system board U described above, or may be an installation surface different from the system board U or the load F.
Further, in order to increase the amount of power generated by the photovoltaic power generation plant 2', the gantry may support the solar cell 6'by tilting it in a predetermined direction (for example, it becomes lower toward the south), and the angle is sufficient. Any number of times can be obtained as long as a large amount of power generation can be obtained, but for example, 10 degrees or 5 degrees.

<Power conditioner 7>
As shown in FIG. 1, the power conditioner 7 uses the DC current from the outside of the power system 1 such as the above-mentioned solar cell 6'and the AC current from the AC motor of the wind power generator to the voltage of the system K and the AC current. It is a device that converts and outputs AC power that matches the phase.
The power conditioner 7 is an inverter device that converts a direct current or the like from a solar cell 6'or the like into an alternating current (for example, 100 V or more and 440 V or less) and a control that controls the voltage and frequency of the alternating current converted by the inverter device. A unit and an aerial circuit breaker (ACB) or the like may be provided.

In the power conditioner 7, the housing in which the inverter device, the control unit, the circuit breaker, and the like are incorporated may be provided with a rotating fan-shaped air blowing means for releasing the air inside the power conditioner 7.
In addition, such a power conditioner 7 is also referred to as a power conditioner 7 for short.

The power conditioner 7 is controlled so as to limit (suppress) the power generation H output from the power conditioner 7 to a predetermined value (target upper limit value, etc.) by a signal from the control unit 9 described later. (So-called, "output limited state C2") may be configured.
The power conditioner 7 may be configured to stop the conversion in the power conditioner 7 by the signal from the reverse power relay 10 or the like described above (by stopping the conversion in this way, the power is generated from the power conditioner 7). It can be said that H is not output).
As described above, the number of the power conditioners 7 may be one or a plurality.
When there are a plurality of power conditioners 7, when the conversion of the power conditioner 7 is stopped by the signal from the reverse power relay 10 or the like described above, even if the conversion of all the power conditioners 7 is stopped at once. You may stop the conversion of at least some of the power conditioners 7 first.

The power conditioner 7 is provided in the switchboard housing 31 of the switchboard 30 having the transformer 8 described later, the power transmission unit 32 and the like described later, or in a housing (power conditioner housing) different from the switchboard 30. It may be built-in.
When built in the power conditioner housing, a plurality of power conditioner housings (that is, the power conditioner 7) are distributed and provided in one photovoltaic power generation plant 2'(below the solar cell 6', etc.). It doesn't matter if you do.

<Transformer 8>
As shown in FIG. 1, the transformer 8 according to the present invention is a transformer (so-called, so-called) that transforms (boosts) the alternating current from one or more of the above-mentioned power conditioners 7 into a higher-voltage alternating current. Step-up transformer).
The transformer 8 may have any configuration as long as it transforms an alternating current outside the switchboard housing 31, which will be described later, into a higher-voltage alternating current. For example, the transformer 8 is attached to the switchboard housing 31 from the outside (board housing). It may be provided on the side outer surface of the body 31 or the like).

Further, it can be said that the transformer 8 is provided in the above-mentioned branch electric circuit 20 (electric circuit between the bus electric circuit M and the power conditioner 7) as the entire electric power system 1.
A cable from outside the switchboard housing 31 or a connection portion (connection terminal) with a cable to the power transmission unit 32, which will be described later, may be provided on the upper surface of the transformer 8, and may be provided on the side surface of the transformer 8. , It may have a heat radiation fin.
The transformer 8 may convert an alternating current from outside the switchboard housing 31 (for example, 100 V or more and 440 V or less) into a higher voltage alternating current suitable for power transmission (for example, 6600 V, 22000 V, etc.).

The transformer 8 may have a sufficient capacity while lowering the height depending on how the iron core is assembled. The specific height of such a transformer 8 is not particularly limited, but is, for example, 1500 mm. It may be less than or equal to (900 mm or more and 1500 mm or less), preferably 1400 mm or less (900 mm or more and 1400 mm or less), more preferably 1200 mm or less (95 mm or more and 1200 mm or less), and more preferably 1150 mm or less (950 mm or more and 1150 mm or less, 1100 mm or more). It may be.
The capacity of the transformer 8 is also not particularly limited, but may be, for example, 50 kVA or more and 1000 kVA or less, preferably 100 kVA or more and 800 kVA or less, and more preferably 200 kVA or more and 700 kVA or less (500 kVA, 330 kVA, etc.).

Such a transformer 8 can be said to be for interconnection, for example, and may be configured to boost 100V or more and 440V or less to 6600V or 22000V with a three-phase three-wire system (3φ3W).
Here, when the transformer 8 is a three-phase three-wire system, the method of assembling the iron core is to arrange four substantially square-shaped iron cores long in the vertical direction (vertical direction) horizontally (horizontally) in contact with each other. , A coil is formed by winding a lead wire (copper wire, etc.) around each of the three parts where two adjacent iron cores are in contact with each other, and each coil has a low-pressure winding on the inside and a high-pressure winding on the outside (or inside). A low-pressure winding is wound on the outside, a high-pressure winding is wound on the outside, and a medium-pressure winding is wound between the low-pressure winding and the high-pressure winding), and an insulator is arranged between the windings.

In addition, each iron core may be a laminated iron core in which thin iron plates are laminated.
Further, such a transformer 8 can be said to be a so-called transformer.
Further, the number of transformers 8 may be one or more as described above.
The transformer 8 may be provided with a plurality of transformers 8 dispersed in one photovoltaic power generation plant 2'(below the solar cell 6', etc.).
The control unit 9 that controls the power conditioner 7 and / or the system connection device S in the power generation device 2 described so far will be described below.

<Control unit 9>
As shown in FIG. 1, the control unit 9 is a part that controls the above-mentioned power conditioner 7 and / or the system connection device S.
The control unit 9 generates power by assuming that the sum of the received power J received from the system K to the system board U and the generated power H output from the power generation device 2 described above is the power consumption D of the load F. It controls the power generation H (which can be said to be the output of the power conditioner 7) output from the device 2.
When the control unit 9 controls the output of the power conditioner 7 (gives the output target value to the power conditioner 7), the control unit 9 causes a power loss such as a transformer loss (also called a step-up loss) in the transformer 8 described above. The output target value is slightly higher than the power generation target value TH, which is the target value of the actual power generation H (power on the high-voltage side (output side) of the transformer 8 provided with the power generation meter 12) in consideration of the minute. May be given to the power conditioner 7.
Further, the time interval (target giving interval) in which the control unit 9 gives the output target value to the power conditioner 7 may be given at predetermined time intervals (even at a predetermined target giving interval), but for example, 1 second. The target assignment interval may be 0.1 seconds or more and 10.0 seconds or less, preferably 1 second or more and 10 seconds or less, such as every 1 second or 5 seconds (here, the target assignment interval will be described later). It may be longer or the same as the sampling time to be performed).

Further, when the reverse power G detected by the reverse power relay 10 described above becomes larger than 0 (that is, when the “reverse power generation state C1” is reached), the control unit 9 stops the conversion of the power conditioner 7 described above. Alternatively, any circuit breaker (power generation circuit breaker 21, system circuit breaker S1, etc.) in the electric circuit from the power conditioner 7 to the system K described above may be interrupted.
In addition, when the shortage power detected by the shortage power relay described above approaches 0 (that is, "when the shortage power becomes almost zero"), the control unit 9 stops the conversion of the power conditioner 7 described above. , Any circuit breaker (power generation circuit breaker 21, system circuit breaker S1, etc.) in the electric circuit from the power conditioner 7 to the system K described above may be interrupted.

When the conversion of the power conditioner 7 is stopped, it is not necessary to match the output from the power conditioner 7 with the voltage, phase, etc. of the system K when the conversion stop is restarted. Therefore, the power conditioner 7 Compared to the case where any of the electric circuits from to system K is cut off, the power system 1 can be restored in a shorter time and with less effort (shorter and easier system restoration). I can say.
In addition, when the control unit 9 cuts off a circuit breaker such as a power generation circuit breaker 21 in terms of hardware when the reverse power generation state C1 is reached, it can be said that the reverse power relay 10 is included in the control unit 9.
As described above, this is when the circuit breaker is cut off in hardware when the undervoltage relay detects an undervoltage, or when the overvoltage is detected in the overvoltage relay, the circuit breaker is cut off in hardware. The same applies when the circuit breaker is cut off by hardware when the undervoltage relay detects an undervoltage, or when the circuit breaker is cut off by hardware when an overvoltage is detected by the overvoltage relay. Therefore, it can be said that the control unit 9 includes these undervoltage relays, overvoltage relays, undervoltage relays, and overfrequency relays.

Any control method may be used as long as the control unit 9 controls the power conditioner 7 with the sum of the received power J and the generated power H as the power consumption D. For example, the following equation ( The target upper limit value (power generation target upper limit value) TH _max of the power generation H may be derived based on 1) or the equation (2).
In the equations (1) and (2), the received power J and the generated power H, the limiting coefficient A (the limiting coefficient A applied to the sum of the received power J corresponding to the load power D and the generated power H), and the fluctuation correspondence Assuming that the constant B changes with time t, the received power is J (t), the generated power is H (t), the limiting coefficient A (t), and the fluctuation response constant is B (t). , The unit of each of the received power J (t), the generated power H (t), and the fluctuation coping constant B (t) is kW or the like.

Here, the received power J (t) and the generated power H (t) may be measured at predetermined time intervals (even at a predetermined sampling time) by the above-mentioned power receiving meter 11 or the power generating meter 12 or the like. However, the sampling time may be 0.01 seconds or more and 10.00 seconds or less, or 0.1 seconds or more and 10.0 seconds or less, for example, every 0.25 seconds, every 1 second, or every 5 seconds. (In FIG. 4, the sampling time of the power receiving meter 11 and the power generating meter 12 and the like is 0.25 seconds (every 0.25 seconds), and the target assignment interval of the control unit 9 is 1 second (every 1 second)). ..
The limiting coefficient A (t) is not particularly limited, but is, for example, a value of 0 or more and 1 or less (that is, 0% or more and 100% or less, 90% or 95%, 98%, 99%, 100%, etc.). The variation correspondence constant B (t) may not be particularly limited, but may be, for example, 0 kW or more and 20 kW or less.
The limiting coefficient A (t) is set to 99 to 100% (for example, 99.0%, 99.5%, 99.8%, 99.9%, etc.), and the limiting coefficient A (t) is set to 100% as much as possible. It is desirable that the received power (power to be purchased) J can be suppressed as much as possible (cost can be reduced) if it can be brought close to.

The control coefficient A (t) and the fluctuation correspondence constant B (t) do not have to be finely changed for each predetermined sampling time. For example, the control coefficient A (t) does not have to be finely changed for each predetermined sampling time. More specifically, "from midnight to 9 am" and "from 5 pm to 12 pm" in the day are A (t) = 1.00 (100%). B (t) = 0 kW or the like, and “from 9:00 am to 5:00 pm” may be A (t) = 0.90 (90%), B (t) = 10 kW or the like.
Such a control unit 9 maximizes the power generation H actually output from the power conditioner 7 so as to be the power generation target upper limit value TH _max derived by the above equations (1) and (2). Power point tracking control (MPPT (Maximum Power Point Tracking) Control) or the like may be performed.

<Target value of power generation H (target value of power generation) TH>
On the other hand, as shown in FIG. 4, the control unit 9 causes the power generation device 2 to generate a power generation H that is as close to the load power D as possible and a power generation H that has the same value as the load power D (limit coefficient A (limitation factor A (). When the power generation H is controlled by setting t) to 99 to 100% or setting the limiting coefficient A (t) as close to 100% as possible), the power conditioner 7 is used when the load power D decreases. Even if the power generation target value TH is given to reduce the power generation H, the actual power generation H does not decrease immediately (the decrease in the power generation H is delayed), so the power generation H becomes the load power by the delay. It is necessary to suppress the generation of reverse power G (power that cannot be consumed by the load F flows to the system K), which is larger than D.
If FIG. 4 is explained in detail, the power generation H is slightly higher than the load power D and the power generation target value TH from the 1st to the 5th seconds and from the 22nd to the 31st seconds of the graph. A negative value appears in the power J (that is, a reverse power G is generated), but since this reverse power G is not 2 to 10% or more (5% or more, etc.) of the received power J, immediately It is not necessary to stop the conversion of the power conditioner 7 or shut off the power generation breaker 21 or the like. On the contrary, the load power D is supplied almost exclusively by the generated power H, and the received power J is hardly generated (almost). I haven't bought electricity).

On the other hand, during the period from the 6th second to the 21st second (about 15 seconds) in the graph of FIG. 4, the generated power H is clearly higher than the load power D and the power generation target value TH, and the received power J becomes A large negative value appears (that is, a large reverse power G is generated), and it is about 15 until it returns to the original state (a state in which the power generation device 2 generates the generated power H as close as possible to the load power D). It's taking seconds.
That is, in the graph of FIG. 4, it can be said that the decrease in the power generation H is delayed by about 15 seconds.
The delay in the decrease in power generation H was about 15 seconds in the graph of FIG. 4, but it may be delayed by 5 seconds or more and 30 seconds or less (10 seconds, 20 seconds, etc.) depending on the power generation device 2 used. ..

Further, it can be said that the reverse power G, which is 2 to 10% or more of the received power J, is generated at the 14th and 15th seconds of the graph of FIG. 4 (reverse power generation state C1). Since this reverse power generation state C1 continues for 1 to 2 seconds or more, it can be said that the control unit 9 stops the conversion of the power conditioner 7 and shuts off the power generation circuit breaker 21 or the like.
In particular, it takes time and effort to match the output from the power conditioner 7 with the voltage, phase, etc. of the system K when reconnecting after shutting off with the power generation breaker 21 or the like. As a whole, the power generation H (the amount of power that can be generated) is reduced, and the power generation H (power conditioner 7) is controlled by the control unit 9 so that the power generation breaker 21 or the like does not cut off as much as possible. It is desirable to do.

Therefore, when the power generation H is lowered, the control unit 9 is lower than the value at which the power generation H is set to zero and / or the power consumption (load power) D of the load F when the power generation H is lowered. The value may be once set as the target value (power generation target value) TH of the power generation H.
By controlling by the control unit 9 in this way, the actual decrease in the generated power H is not delayed, and the generated power H is less likely to be larger than the power consumption D of the load F. Therefore, the reverse power G is generated (consumed by the load F). It is possible to suppress the flow of power that cannot be performed to the system K).

More specifically, the control unit 9 sets a value that makes the power generation H zero only for the first few seconds (5 seconds, etc.) of the delay of about 15 seconds. , Once the power conditioner 7 etc. is controlled as the power generation target value TH (“zero target value control”), and then (about 10 seconds, etc.), the received power J and the generated power H measured every second. The power conditioner 7 or the like may be controlled by using the load power D itself calculated from the sum of the above as the power generation target value TH.
Naturally, the time for controlling the zero target value is not limited to the first 5 seconds, but is only the first 1 second, or 0.1 seconds or more and 10.0 seconds such as the first 3 seconds or 7 seconds. It may be as follows.

In addition, for example, the control unit 9 sets a value lower than the load power D when lowering the power generation H for the first few seconds (5 seconds, etc.) of the delay of about 15 seconds as the power generation target value TH. After controlling the conditioner 7 etc. (“low target value control”) (for about 10 seconds, etc.), the load power D itself calculated from the sum of the received power J and the generated power H measured every second is used. , The power conditioner 7 or the like may be controlled as the power generation target value TH.
Of course, the time for controlling the low target value is not limited to the first 5 seconds, but is limited to the first 1 second, or 0.1 seconds or more and 10.0 seconds such as the first 3 seconds or 7 seconds. It may be as follows.
Further, the “value lower than the load power D when lowering the generated power H”, which is the power generation target value TH, is not particularly limited as long as it is lower than the load power D, but for example, the load power D measured for each sampling time. (Sum of received power J and generated power H) is 1% or more and 99% or less, preferably 5% or more and 95% or less, and more preferably 10% or more and 90% or less (20%, 50%, 70%, etc.). You may.

In addition, the above-mentioned zero target value control and low target value control may be combined. For example, the control unit 9 performs zero target value control only for the first few seconds (5 seconds, etc.) with a delay of about 15 seconds. After that (for about 10 seconds, etc.), low target value control may be performed.
Naturally, the time for controlling the zero target value is not limited to the first 5 seconds, but is only the first 1 second, or 0.1 seconds or more and 10.0 seconds such as the first 3 seconds or 7 seconds. Of course, the time for controlling the low target value after that may be not limited to the last about 10 seconds, but may be the last about 14 seconds, the last about 12 seconds, about 8 seconds, and the like. , It may be about 5 seconds or more and about 14 seconds or less.

Here, at the timing (trigger) of performing zero target control or low target value control, the load power D (sum of the received power J and the generated power H) suddenly becomes 2 to 10% or more of the received power J (for example, 2). When it changes (or decreases) (% or more), zero target value control or low target value control may be started.
The control unit 9 may be provided in any of the power systems 1 as long as it is in the power system 1. For example, the control unit 9 may be provided in the switchboard 30 (switchboard housing 31) described later.
The following describes the control board 9, the switchboard 30 including the transformer 8, the switchboard housing 31, the power transmission board 32, and the like described so far.

<Switchboard 30, switchboard housing 31>
As shown in FIG. 1, the switchboard 30 according to the present invention is a switchboard housing 31, a board having the above-mentioned transformer (step-up transformer) 8 and the above-mentioned power transmission unit 32, and is the switchboard housing 31. Is shown in a substantially concave shape in FIG. 1, but may actually be formed in a substantially rectangular parallelepiped shape or the like.
In the switchboard 30, when the transformer 8 is attached to the switchboard housing 31 from the outside, the power transmission unit 32 is provided in the switchboard housing 31, and the power generation meter 12 is not built in the power generation connection board 4 described above. A power generation meter 12 may also be provided in the switchboard housing 31.
The height of the switchboard 30 (switchboard housing 31) may be low, and the specific height of such a switchboard housing 31 is not particularly limited, but is, for example, 1500 mm or less (900 mm or more and 1500 mm or less). It may be 1400 mm or less (900 mm or more and 1400 mm or less), more preferably 1200 mm or less (95 mm or more and 1200 mm or less), and more preferably 1150 mm or less (950 mm or more and 1150 mm or less, 1100 mm or the like).

In addition, the power distribution board 30 includes the power conditioner 7 described above, a current collecting unit 33 described later, a backflow prevention diode, a switch, an air conditioner, a power failure-free power supply (UPS), an auxiliary machine, and a fuse (the high-voltage current limiting fuse described above). Other fuses, etc.), relays (such as the above-mentioned underpower relays, undervoltage relays, overvoltage relays, undervoltage relays, relays other than overvoltage relays, etc.), cables (wiring cords), terminals, connectors, sensors, CPUs, storage batteries, It may have a control unit 9 or the like (may be built in the switch board 30).
Further, the number of switchboards 30 (that is, the switchboard housing 31) may be one or more as described above, but may be the same as the number of transformers 8 and power transmission units 32 described above. Absent.
The switchboard 30 may be provided with a plurality of switchboards 30 dispersed in one photovoltaic power generation plant 2'(below the solar cell 6', etc.).

<Power transmission unit 32, etc.>
As shown in FIGS. 1 and 2, the power transmission unit 32 is a part that transmits the alternating current from the transformer 8 described above to the outside of the switchboard housing 31.
The power transmission unit 32 may have any configuration as long as it transmits the alternating current from the transformer 8 to the outside of the switchboard housing 31, but for example, the power transmission unit 32 is provided inside the switchboard housing 31 and has a vacuum circuit breaker (VCB) or the like. A circuit breaker (so-called power transmission circuit breaker 21), a lightning arrester (SAR), or the like may be provided.

In the power transmission unit 32, the AC current from the transformer 8 described above passes through the power generation circuit breaker 21 and the like described above, and then is connected to the system K via a distribution cable as the outside of the switchboard housing 31 or other. The power transmission unit 32 is finally connected to the system K via a system board U that collects power from the plurality of distribution board housings 31 (that is, the distribution board 30), and the power transmission unit 32 is configured to be electrically connected to the system K and to be able to transmit power. All you need is.
The power transmission unit 32 can be said to be a transmitter, and can also be said to be an extra high voltage unit when transmitting an extra high voltage (for example, 22000V or the like).
Further, the number of power transmission units 32 may be one or more as described above, but may be the same as the number of transformers 8 described above.

<Current collector 33, etc.>
As shown in FIG. 1, the current collecting unit 33 is a portion that collects a plurality of AC cables (cables through which AC current flows) or DC cables (cables through which DC current flows) from outside the switchboard housing 31.
The current collector 33 can be said to be an AC current collector when collecting a plurality of AC cables, and can be said to be a DC current collector when collecting a plurality of DC cables.

Hereinafter, the current collecting unit 33 is mainly described as being an AC current collecting unit 33'that collects a plurality of AC cables from the outside of the switchboard housing 31.
The AC current collector 33'may be provided in any of the switchboard housings 31 as long as it is included in the switchboard housing 31, but is provided, for example, inside the switchboard housing 31 ( It doesn't matter if it is built-in).

Further, the AC current collecting unit 33'has a plurality of AC shields (AC breakers), and the AC breakers may be molded case circuit breaks (MCCB), and these plurality of AC breakers may be used. Each of the power conditioners 7 outside the switchboard housing 31 is connected to the step-up transformer 8 described above via the AC current collecting unit 33'.
If such an AC breaker is also provided in the switchboard housing 31, the switchboard housing 31 (switchboard 30 itself) also has a function of a conventional AC current collector box.

<Power storage unit 5>
As shown in FIG. 1, the power storage unit 5 is a part that stores electric power, and may be connected to an electric circuit between the system connection device S and the power generation device 2.
The power storage unit 5 charges the generated power H output from the power generation device 2, flows the charged power to the load F side and consumes the charged power, or if the power can be sold, the charged power is used. It may flow to the system K side via the system connection device S.

<Reduction of power loss by power storage unit 5>
As shown in FIG. 5, the power consumption D that can be consumed by the load F in the power system 1 is constant (the maximum power consumption D _max that can be consumed by the load F is 340 kW), and the power generation H of the power generation device 2 is increased. In addition (in the case of a photovoltaic power generation plant 2', a solar cell 6'was added, etc.), the amount of power generated by the power generation device 2 for one year (the amount of power generated H multiplied by one year's time) is Naturally, it increases in proportion to the amount of increase in power generation H.
On the other hand, the amount of power consumed by the load F in one year (the amount obtained by multiplying the load power D by the time for one year) can be consumed by the load F no matter how much the power generation H of the power generation device 2 is increased. Since the capacity is limited, the power generation H (installed solar cell 6') gradually becomes gentler from around 300 kW (begins to move downward from the straight line of the power generation amount of the proportional power generation device 2). When the power generation H approaches 700 kW, it is almost flat (the power consumption D that can be consumed by the load F hardly increases), so that the increase in the power generation H of the power generation device 2 (increased capacity for power generation) cannot be fully utilized. ..
Therefore, by connecting the power storage unit 5 to the electric path between the grid connection device S and the power generation device 2, the amount of power that cannot be consumed by the load F can be stored, and power cannot be generated in the power generation device 2 such as the solar power generation plant 2'. If there is a time zone or the like, the power discharged from the power storage unit 5 is used during that time zone, or if the power can be sold, the charged power is sent to the system K side via the system connection device S. Therefore, the increase in the power generation H of the power generation device 2 can be fully utilized. It should be noted that FIG. 5 shows the results at a half-roofed photovoltaic power generation plant 2'at a certain place in Tochigi prefecture.

<Others>
The present invention is not limited to the above-described embodiments. The structure, shape, dimensions, and the like of each configuration or the whole of the power system 1, the power generation device 2, the power generation connection board 4, and the like can be appropriately changed according to the gist of the present invention.
In the power system 1, the power generation connection device 3 does not have to be connected to the bus line M, and when the load F has a transformer (step-down transformer) F1, for example, the power generation connection device 3 is transformed. The system connection device S may be connected to the low pressure side of the device F1.
The electric power system 1 may not have the power storage unit 5 connected to the electric circuit between the system connection device S and the power generation device 2, or may not have the power storage unit 5 itself in the first place.
The power generation device 2 may be a fuel cell, a generator powered by fuel such as gasoline, or the like (so to speak, only the power generation unit 6) without having a power conditioner 7 or a transformer.

The power system 1 may have a reverse power relay 10 or the like, but may separately have a reverse power meter for measuring the reverse power G, and the control unit 9 generates the above-mentioned reverse power by these reverse power meters. After determining whether the state C1 has been reached, the circuit may be shut off according to the reverse power G, cut off by any of the circuit breakers according to the insufficient power, and cut off by another circuit breaker according to the reverse power G.
Further, when the received power J measured by the power receiving meter 11 approaches 0, the control unit 9 stops the conversion of the power conditioner 7 or any of the circuit breakers from the power conditioner 7 to the system K (the control unit 9). The power generation circuit breaker 21 etc.) may be shut off.

The power generation meter 12 is provided in the electric circuit between the power conditioner 7 and the transformer 8, and the power directly output from the power conditioner 7 may be used as the power generation H.
The switchboard 30 may be provided with a power conditioner 7 in the switchboard housing 31.

The power system and power generation connection board can be used for the system board regardless of whether it is existing or new.
The power generation device can be used as a solar power plant, etc. regardless of the amount and scale of power generation, and in addition to the solar power plant, a generator (AC motor, etc.) rotated by wind power, hydraulic power, wave power, geothermal power, etc. It can be used as a power generation plant and can be used both outdoors and indoors.

1 Power system 2 Power generation device 3 Power generation connection device 4 Power generation connection board 4'Power generation connection board panel housing 5 Power storage unit 6 Power generation unit 7 Power conditioner 8 Transformer 9 Control unit 10 Reverse power relay 11 Power receiver 11 Power generation total 12 Total K system S system connection device U system board U'system board panel housing F load D load power consumption M bus line electric line H power generation TH power generation target value (power generation target value)
G Reverse power J Received power

Claims (6)

A power system having a system board (U) having a system connection device (S) connected to the system (K) and a load (F) connected to the system connection device (S).
It has a power generation connection board (4) in which a power generation connection device (3) for connecting a power generation device (2) to the system connection device (S) and a load (F) is built.
The board housing (4') of the power generation connection board (4) is a power system characterized in that it is attached to the board housing (U') of the system board (U). The power system according to claim 1, wherein the power generation connection device (3) is connected to a bus line (M) connecting between the system connection device (S) and the load (F). The power system according to claim 1 or 2, wherein a power storage unit (5) for storing electric power is connected to an electric circuit between the system connection device (S) and the power generation device (2). The power generation device (2) includes a power generation unit (6) that generates electric power, a power conditioner (7) that converts a DC current or an alternating current from the power generation unit (6) into an alternating current, and the power conditioner. A transformer (8) that transforms the alternating current input from (7) into a higher-pressure alternating current, and a power generation device (2) that outputs a higher-pressure alternating current from the transformer (8). A control unit (9) that controls as a force (H) is provided.
The control unit (9) has a value that makes the power generation (H) zero when the power generation (H) is lowered, and / or a load (F) when the power generation (H) is lowered. The power system according to any one of claims 1 to 3, wherein a value lower than the power consumption (D) of the above is once set as a target value (TH) of the power generation (H). A power generation unit (6) that generates electric power, a power conditioner (7) that converts a DC current or an alternating current from the power generation unit (6) into an alternating current, and an alternating current input from the power conditioner (7). A transformer (8) that transforms the current into a higher-pressure AC current, and a control that controls the higher-pressure AC current from the transformer (8) as the generated power (H) output from the power generation device (2). It is a power generation device equipped with a part (9).
The control unit (9) has a value that makes the power generation (H) zero when the power generation (H) is lowered, and / or a load (F) when the power generation (H) is lowered. A power generation device characterized in that a value lower than the power consumption (D) of is once set as a target value (TH) of the power generation (H). The system connection device (S) connected to the system (K) and the power generation connection device (3) for connecting the power generation device (2) to the load (F) are the power generation connection board built in the panel housing (4'). There,
As the power generation connection device (3), a reverse power relay (10) for detecting the reverse power (G) flowing back from the system connection device (S) to the system (K), and a system connection device (K) from the system (K). It is provided with a power receiving meter (11) for measuring the received power (J) received by the S) and a power generating meter (12) for measuring the generated power (H) output from the power generation device (2). A power generation connection board that features that.