JP6995684B2 - Distribution board system - Google Patents

Description

The present invention relates to a distribution board system having a function of receiving electric power from an electric power system and selling electric power generated by a consumer (in some cases, stored electric power) by reverse power flow to the electric power system.

Photovoltaic power generation, which is a renewable energy, is becoming widespread because surplus power or total power can be sold at a relatively high fixed price for a fixed period based on the FIT (Fixed Price Purchase System).
However, after a certain period of time has passed, there may be cases where it is economically advantageous to consume the photovoltaic power generation in-house for economic reasons such as a decrease in the unit price of electricity sold. Therefore, for example, as described in Patent Document 1, a system has been proposed in which a storage battery is separately installed to enable effective switching between power sale and self-consumption.

Japanese Unexamined Patent Publication No. 2013-158132

As described above, when the FIT is completed, the unit price of solar power generation decreases, so that there is a method of interconnection in which only the surplus power is sold mainly to the consumption of the consumer. In that case, the configuration as described in Patent Document 1 may be configured in advance, but this configuration itself requires a plurality of switches and their controllers, which is costly. Moreover, when trying to construct such a new configuration, a new space was required around the distribution board in addition to the wiring work.

In addition, when two solar power generation devices installed at different times are installed, the unit price of power is the same at the beginning of installation, so it was possible to sell power by reverse power flow to the power system in one electric circuit at once. Since one of the FITs ends in the middle and becomes a non-FIT, there is a difference in the unit price of electricity sold. If this happens, reverse power flow will not be possible on a common electric circuit.
Therefore, in order to continue selling power, it was necessary to separate the electric circuits of the two photovoltaic power generation devices, and it was not possible to easily continue selling power. The non-FIT targets originally include power storage equipment, gas power generation, fuel cell power generation, electric vehicles, and the like.

Therefore, in view of these problems, the present invention is provided with private power generation devices at different installation times, so that even if a private power generation device that is one of the non-FIT targets is generated from the FIT target, new wiring work can be performed. The purpose is to provide a distribution board system that can continue to sell power as a non-FIT target without doing so.

In order to solve the above problems, the invention of claim 1 has a plurality of branches of a main breaker for receiving power from a power system and a secondary side of the main breaker for supplying power received to individual loads of consumers. A distribution board equipped with a branch breaker and two private power generation connections to which a private power generation device is connected, and two power meters installed in the middle of the service line from the power system to the distribution board. The two power meters are arranged in series and connected to the primary side of the main breaker, and in addition to measuring the received power, it is also possible to measure the power sold. The private power generation connection is provided with a lead-in wire so as to be arranged between the two power meters, and one of the two private power generation connections is connected to the private power generation device. A switching means for changing the connection destination is provided, and the connection destination of the private power generation device connected to one of the private power generation connection parts can be changed to the downstream side of the two power meters by switching the switching means. It is a feature.

According to the present invention, when one of the private power generation devices shifts from FIT to non-FIT due to different installation times of the two private power generation devices, the one private power generation device that has become a non-FIT target by the operation of the switching means Since the connection position is changed from between the two watt-hour meters to the secondary side of the main breaker, it is possible to switch to weighing on the non-FIT side, and it is possible to sell power as non-FIT. Therefore, it is possible to continue selling power without performing new wiring work or the like.

It is a block diagram which shows an example of the distribution board system which concerns on this invention.

Hereinafter, embodiments that embody the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an example of a distribution board system according to the present invention, which includes a distribution board 1 and two watt-hour meters 2 (first watt-hour meter 2a, second watt-hour meter 2b). There is. The distribution board 1 is capable of connecting two solar power generation devices 3 (first solar power generation device 3a and second solar power generation device 3b) as private power generation devices.

The distribution board 1 has two circuit breakers 14 (first circuit breaker 14a, second circuit breaker 14a, second) as a private power generation connection unit for connecting a main breaker 11, a plurality of branch breakers 12, a switching switch 13, and a photovoltaic power generation device 3. A circuit breaker 14b) is installed. However, the photovoltaic power generation device 3 connected to the circuit breaker 14 is first connected to the first circuit breaker 14a. That is, the first photovoltaic power generation device 3a is connected to the switching switch 13, and the second photovoltaic power generation device (second photovoltaic power generation device 3b) is connected to the second circuit breaker 14b.

The two watt-hour meters 2 (2a, 2b) are arranged in series between the power system 5 and the main breaker 11, and a circuit breaker 14 is connected between the two watt-hour meters 2. Specifically, the lead-in line L1 from the power system 5 is connected to the primary side of the first watt-hour meter 2a, and the secondary side of the first watt-hour meter 2a is connected to the circuit breaker 14 by the power line L2. It is drawn into the distribution board 1.
A terminal block 15 for connecting the photovoltaic power generation device 3 is attached to the distribution board 1, and the power line L2 is connected to the terminal block 15.

Then, the power line L3 connected via the terminal block 15 is connected to the primary side of the second watt-hour meter 2b, and the secondary side of the second watt-hour meter 2b is connected to the primary side of the main breaker 11 via the power line L4. It is connected. As a result, the first watt-hour meter 2a and the second watt-hour meter 2b are arranged in series. Both the first watt-hour meter 2a and the second watt-hour meter 2b can measure the power sold back to the power system 5 in addition to the power received from the power system 5.

Further, the primary side of two circuit breakers 14 for connecting the output cable of the photovoltaic power generation device 3 is connected to the terminal block 15, and the circuit breaker 14 is electrically connected to the power line L2 in the terminal block 15. ing. However, the secondary side of one of the first circuit breakers 14a is connected to the switching switch 13, and the first photovoltaic power generation device 3a is connected via the switching switch 13.
In this way, the two photovoltaic power generation devices 3 are configured to be connected in parallel between the first watt-hour meter 2a and the second watt-hour meter 2b.

The secondary side of the main trunk breaker 11 is connected to the main trunk bar L5 laterally arranged in the distribution board 1, and the main trunk bar L5 is a plurality of branch breakers arranged on both upper and lower sides or one side thereof. It is connected to each of the twelve.
Further, a storage battery 16 is connected to one of the branch breakers 12 arranged in a row, so that the generated power can be stored. Instead of the storage battery 16, the electricity storage of the electric vehicle may be used.

The switching switch 13 has a total of three terminals, a switching source terminal 13a to which the first solar power generation device 3a, which is the switching source, is connected, and two switching destination terminals (first terminal 13b, second terminal 13c) of the switching destination. have. The first terminal 13b is connected to the secondary side of the first circuit breaker 14a, and the second terminal 13c is connected to the main bar L5 via the branch breaker 12. Switching between the first terminal 13b and the second terminal 13c is performed by operating an operation handle (not shown).

The photovoltaic power generation device 3 has a plurality of solar cell panels and a power conditioner (none of which are shown), and the DC power generated by the solar cell panel is interconnected to the commercial power system by the power conditioner. It is converted to AC power and output.

In the distribution board system configured in this way, the switching switch 13 is switched and used as follows. First, when the unit selling price of the first solar power generation device 3a and the second solar power generation device 3b are the same, the connection destination of the first solar power generation device 3a is the main breaker 11-2 even between the watt-hour meters 2. Either of the following sides may be used.
That is, the switching source terminal 13a of the switching switch 13 may be connected to either the first terminal 13b or the second terminal 13c. Regardless of which connection is made, the power sold by the two photovoltaic power generation devices 3a and 3b is collectively measured by the first watt-hour meter 2a via a common electric circuit (power line L2).

When the unit price of the power sold is different due to the change from the FIT target to the non-FIT target, the switching source terminal 13a is connected to the second terminal 13c. In this case, the power sold by the first photovoltaic power generation device 3a is reversely flowed through the second watt-hour meter 2b and the first watt-hour meter 2a, so that the power can be measured by the second watt-hour meter 2b.
On the other hand, the power sold by the second photovoltaic power generation device 3b can be measured by deleting the measured value of the second watt-hour meter 2b from the measured value of the first watt-hour meter 2a. You can continue to sell electricity even if the unit price of electricity is different.

In this way, even if the two solar power generation devices 3 (3a, 3b) are installed at different times, one of them is a non-FIT target and the other is a FIT target, and the unit price of electricity sold is different. By changing one of the photovoltaic power generation devices 3 targeted for non-FIT by the operation of the device 13 to the secondary side of the main breaker 11 which is the downstream side of the two watt-hour meters 2, the weighing is switched to the non-FIT side. It is possible to sell electricity as a non-FIT. Therefore, it is possible to continue selling power without performing new wiring work or the like.

In the above embodiment, when the unit price of electricity sold is different, the connection position of the first photovoltaic power generation device 3a is set to the secondary side of the main breaker 11, but the second power meter 2b and the main breaker 11 may also be used. Similarly, only the power sold by the first photovoltaic power generation device 3a can be measured by the second watt-hour meter 2b.
Further, although the case where the solar power generation device 3 is installed as the private power generation device has been described, other power generation devices may be used, and for example, a wind power generation device which is also renewable energy may be used.

1 ... Distribution board, 2 (2a, 2b) ... Electricity meter, 3 (3a, 3b) ... Solar power generation device (private power generation device), 11 ... Main breaker, 12 ... Branch breaker, 13・ ・ Switching switch (switching means), 14 (14a, 14b) ・ ・ Circuit breaker (private power generation connection), 15 ・ ・ Terminal block.

Claims (1)

A main breaker for receiving power from the power system, a plurality of branch breakers for branching the secondary side of the main breaker to supply the received power to the individual load of the consumer, and two to which the private power generation device is connected. A distribution board system having a distribution board provided with a private power generation connection and two watt-hour meters installed in the middle of a service line from the power system to the distribution board.
The two watt-hour meters are arranged in series and connected to the primary side of the main breaker, and can measure the power sold as well as the power received.
In the private power generation connection portion, the drop line is arranged so as to be arranged between the two watt-hour meters, and the in-house power generation connection portion is arranged.
One of the two private power generation connection portions is provided with a switching means for changing the connection destination with the private power generation device to be connected.
A distribution board system characterized in that the connection destination of the private power generation device connected to the private power generation connection portion can be changed to the downstream side of the two electric energy meters by the switching operation of the switching means.

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