JPH11113188A - Power conditioner indicator and distributed power supply system using the indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor an AC power output state consistently by a method wherein a function which indicates the output data of a power conditioner is provided and a power for the indication operation is supplied from a system power supply. SOLUTION: An indicator 3A is connected to a power conditioner 2 with a control line and a power line and indicates an AC power output state given by the power conditioner 2 in a digital form. An AC power supplied from a system power supply 4 is converted into a DC power and supplied to the indicator 3A if necessary. With this constitution, the AC power output state can be monitored at night when the demand power is largest.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display for displaying output data of a power conditioner incorporated in a distributed power supply system such as a photovoltaic power generation system, and a distributed power supply system using the same.

[0002]

2. Description of the Related Art In recent years, a distributed power source such as solar power generation and a system power source (commercial power source) are interconnected, and surplus power that is supplied to home appliances (loads) by solar power generation is transmitted to a system. A solar power generation system that supplies power from the system power supply side when the power flows backward to the power supply but the power cannot be provided solely by solar power generation has been developed. Such a solar power generation system is configured as follows. That is, the photovoltaic power generation system includes a solar cell, and power conversion means for converting DC power generated by the solar cell into AC power synchronized with a system power supply. A connection box (consisting of a diode and a switch) for connecting to the power conversion means in a state where the power supply is prevented, and a protection means for detecting an abnormality of the system power supply and controlling the connection state with the system power supply to turn on and off. ing. In the photovoltaic power generation system configured as described above, the power conversion unit, the protection unit, and the like are called a power conditioner.

[0003] For the photovoltaic power generation system having the above-described configuration, a monitor system in which subsidies are provided at the time of installation is currently being implemented by the Ministry of International Trade and Industry. As a condition for enjoying the monitoring system, a user who desires the monitoring system is obliged to regularly (for example, every month) report the generated power amount.

[0004] Therefore, it has been demanded that the power conditioner constituting the photovoltaic power generation system has a configuration for storing and displaying data necessary for the report. However, the power conditioner is a large-sized device, and cannot be arranged at a position that is easy for the user to monitor, such as a living room. for that reason,
In addition to the output data required for the above report [AC power output data such as current instantaneous power generation, power generation, and integrated power generation (accumulated power generation since each solar power generation system was installed)], A display for displaying the operating state, the failure state, the details of the failure, and the like is provided separately from the power conditioner, and the separated display is arranged at a position easily monitored by a user, such as a living room. By providing such a display, the recording work for the report can be easily performed, and it is possible to sufficiently respond to the user's request to check the daily generated power amount.

[0005]

However, a photovoltaic power generation system having such a display has the following problems. That is, the display has a configuration in which the driving power is supplied from the conditioner. Therefore, the display operation cannot be performed during the night when power cannot be generated by the solar cell. However, it is often the case that the user checks the data of the AC power output state during the night when the user's daily work is finished, and therefore, the conventional display configuration is most likely to perform the check. There was a problem that the check could not be performed at night.

Accordingly, an object of the present invention is to improve the convenience by enabling the user to always check the AC power output state.

[0007]

According to the first aspect of the present invention, a display for a power conditioner has a function of displaying output data from the power conditioner. It is characterized in that power is supplied from the system power supply side, and thus has the following operation. That is, even when the solar cell does not generate power at night, the display can be confirmed by supplying control power from the system power supply.

According to a second aspect of the present invention, there is provided the power conditioner display according to the first aspect,
It is characterized by having a function of storing the output data, and thereby has the following operation. That is, the output data of the power conditioner read from the storage unit can be constantly displayed on the display.

According to a third aspect of the present invention, there is provided the power conditioner display according to the first or second aspect, further comprising an operation unit for controlling the power supply operation. This has the following effects. That is, if the control unit performs a control operation so as to supply power from the system power supply only when the output data of the power conditioner is desired to be displayed, the power consumption required for the display operation can be suppressed to the minimum necessary.

According to a fourth aspect of the present invention, there is provided a power source such as a solar cell or a fuel cell, and a power conditioner for converting DC power generated by the power source into AC power synchronized with a system power supply. , And a display according to claim 1 to constitute a distributed power supply system.
The same function as the first aspect is exhibited.

According to a fifth aspect of the present invention, in a distributed power supply system, a power supply such as a solar cell or a fuel cell, and the DC power generated by the power supply are converted into AC power synchronized with a system power supply. It has a power conditioner for conversion, a display for displaying output data of the power conditioner, and power storage means, and the power storage means can supply power to the power conditioner in response to an external operation. The power conditioner is characterized in that it is configured to be able to drive the display in response to power supply from the power storage means, thereby having the following operation. That is, power is supplied to the display from the power storage unit via the power conditioner only when necessary.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First Embodiment FIG. 1 is a system diagram showing a configuration of a photovoltaic power generation system according to a first embodiment of the present invention, and FIG. 2 (a) is a plan view of a display. FIG. 2B is a block diagram showing a configuration of the display. This photovoltaic power generation system is arranged at a position where the user can easily confirm the display, such as a solar cell 1 disposed outdoors such as a roof, a power conditioner 2 disposed at an attic or a warehouse under stairs, and a living room. And a display 3A.

The power conditioner 2 has an input side connected to the solar cell 1 and an output side connected to the system power supply 4, and synchronizes the DC power generated by the solar cell 1 with the system power supply 4. A power conversion means (mainly composed of an inverter) for converting the power to AC power and outputting the AC power to the system power supply 4, and a protection for detecting an abnormality of the system power supply 4 and controlling the connection state between the system power supply 4 and the ON / OFF state. Means (mainly composed of an abnormality detection sensor and a switch unit). The power conversion means and the protection means are not shown.

The display 3A is connected to the power conditioner 2 by a control line and a power line. As shown in FIG. 2A, the display 3A has a display body 5 such as an LED or a liquid crystal display, and a display body 5 as shown in FIG. And an operation switch section 6A for performing operations such as display switching. The display main body 5 includes a quantity display section 5a for digitally displaying (or an analog display) an AC power output state (output data) by the power conditioner 2, and an operation state display section 5b for displaying an operation / stop state and presence / absence of a failure. It has.

The display 3 having such a display operation configuration
A includes, for example, as shown in FIG. 2B, a display power supply unit 7, a storage unit 8, and a display control unit 9A.

The display power supply means 7 is composed of a switching power supply or the like, and converts AC power (for example, AC 100 V) supplied from the system power supply 4 to DC power (for example, DC 5 V) as necessary. It is supplied to the display 3A. The storage unit 8 stores an AC power output state (output data) of the power conditioner 2. The display control unit 9A controls the operation of the entire display 3A, periodically reads the AC power output state from the power conditioner 2 and stores it in the storage unit 8, and the AC power stored in the storage unit 8. The drive control of the display main body 5 for displaying the output state is performed.

In the photovoltaic power generation system configured as described above, during the night when the user most desires to check the AC power output state of the power conditioner (time period when the user is free after finishing a day's work). , The AC power output state can be checked. This will be described below.

First, during a period in which the solar cell 1 produces DC power (daytime), the display control section 9A performs the following operation. That is, the display control unit 9 </ b> A periodically reads out the data of the AC power output state (generated power, generated power amount, integrated generated power amount, etc.) from the power conditioner 2, and stores the data in the storage unit 8. The AC power output state data is updated and stored. At the same time, the display control unit 9A performs the following operation. That is, the operation of reading out the data of the AC power output state stored in the storage unit 8 in real time and displaying the data on the display body 5 is performed. The switching of the display data between the data of the AC power output state to be displayed (for example, the display switching from the generated power amount data to the integrated generated power amount data) is performed by the display switching performed by the user on the operation switch unit 6A. Upon receiving the operation, the display control unit 9A performs the operation. In performing the above operations, the display 3A is supplied with power from the power conditioner 2.

On the other hand, during a period in which the solar cell 1 does not produce DC power (eg, at night), the display control unit 9A cannot perform an operation of reading data of an AC power output state from the power conditioner 2. Therefore, the storage unit 8 receives the power supply from the display power supply unit 7 and maintains the stored data of the AC power output state (daytime data). When the storage unit 8 is formed of a nonvolatile memory, it is not necessary to consume power for maintaining data.

On the other hand, at this time (at night), the display control section 9A
Reads out the data of the AC power output state stored in the storage unit 8 and continuously performs the operation of displaying the data on the display main body 5. The display main body 5 supplies power from the display power supply unit 7. As a result, data such as the amount of generated power during the day is always displayed. Therefore, at night, when the user wants to check the amount of generated power in one day, the user can immediately check it by looking at the quantity display unit 5a.

The items that the user can check on the display of the display main body 5 include not only the above-described data of the AC power output state, but also the operation status history and the failure history. In this case, the operation switch unit 6 stores the data of the operation status history and the failure history in the storage unit 8.
By operating A, the display mode of the quantity display unit 5a may be changed to the display mode of the operation status history or the failure history.

Second Embodiment FIG. 3 shows a display constituting a photovoltaic power generation system according to the present embodiment. Specifically, FIG. 3A is a plan view of the display, and FIG. 3B is a block diagram illustrating a configuration of the display.

The photovoltaic power generation system of this embodiment basically has the same configuration as that of the first embodiment.
The same or similar parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

Display 3 of this solar power generation system
B is provided with a switch 10 for turning on and off the AC power supply of the system power supply 4 to the display power supply means 7, and the operation switch unit 6B is provided with a power switch 6a for turning on and off the switch 10. The opening and closing of the device 10 is controlled in accordance with the on / off operation of the power switch 6a.

In this photovoltaic power generation system, when the user wants to check the AC power output state in a state where the solar cell does not generate power, such as at night, the user turns on the power switch 6a of the display 3B. Then, the switch 10 is closed in response to the ON operation of the power switch 6a, so that the display power supply means 7 is supplied with AC power from the system power supply 4, and the display 3B is displayed with the display power supply means 7 from the display power supply means 7. Power is supplied. As a result, the AC power output state stored in the storage unit 8 is displayed on the quantity display unit 5a. Therefore, the user can check the AC power output state by looking at the display of the quantity display section 5a. When the check of the AC power output state is completed, the power switch 6a is turned off to stop the display operation.

As described above, in the photovoltaic power generation system according to the present embodiment, the display 3B can be operated only when it is desired to check the AC power output state. Electricity can be achieved.

In the photovoltaic power generation system, during the daytime, while the solar cell 1 is producing DC power, data of the AC power output state is transmitted between the power conditioner 2 and the display 3B (storage unit 8). However, since power is supplied from the power conditioner 2 to the display 3B, data can be transmitted and received without any problem even when the switch 10 is open.

If the storage section 8 is composed of a non-volatile memory, there is no need to consume power for maintaining data, and power is supplied from the display power supply means 7 to the storage section 8 when the switch 10 is open. Even when the data is not stored, the data stored in the storage unit 8 does not disappear.

Third Embodiment FIG. 4 is a configuration diagram of a photovoltaic power generation system of the present embodiment, FIG. 5A is a plan view of a display, and FIG.
FIG. 3 is a block diagram showing a configuration of a display. This solar power generation system basically has the same configuration as that of the first embodiment, and the same or similar parts are denoted by the same reference numerals.

The photovoltaic power generation system according to the second embodiment is characterized in that the display 3C has a configuration slightly different from that of the first embodiment by including the power storage means 11 and the power storage means 11. There is.

The power storage means 11 stores the power of the system power supply 4 or a part of the output power of the solar cell 1, and is connected to the output of the solar cell 1 in parallel with the power conditioner 2. The power storage means 11 is composed of a battery such as a lead storage area.

The display 3C is connected to the power conditioner 2 by a control line and a power line, and is supplied with driving power for display operation from the power conditioner 2. The display 3C is connected to the power storage unit 11 by a control line.

As shown in FIG. 2A, the display 3C has a display main body 5 on its surface and an operation switch section 6C for performing operations such as switching the display of the display main body 5. The operation switch unit 6C includes an on / off switch 6b for turning on / off the output of the DC power stored in the power storage unit 11. The display main body 5 has a configuration similar to that of the first embodiment, that is, includes a quantity display section 5a and an operation state display section 5b.

The display 3 having such a display operation configuration
C is, for example, as shown in FIG.
C is provided. The display control unit 9C controls the operation of the entire display 3C, and controls the display operation of reading the AC power output state from the power conditioner 2 and displaying it on the quantity display unit 5a.

Hereinafter, the operation of this solar power generation system will be described.

During the period (daytime) during which the solar cell 1 produces DC power, much of the DC power produced by the solar cell 1 is output to the power conditioner 2 where it is converted into AC power and converted into AC power. Sent to At this time,
The storage means 11 includes the output power of the system power supply 4 and the solar cell 1.
Are supplied and stored.

At this time, the data of the AC power output state of the power conditioner 2 is stored in the quantity display section 5 as follows.
a. That is, since the power conditioner 2 stores data of the AC power output state (generated power, generated power amount, integrated generated power amount, and the like), the display control unit 9C transmits the AC power output state from the power conditioner 2. Is read out, and an operation of displaying the data on the display main body 5 (quantity display section 5b) in real time is performed. At this time, the electric power used for the display drive is obtained by dividing a part of the control power supply (DC) for the power conditioner generated in the power conditioner 2 by the display 3C.
Supplied to Therefore, the display body (quantity display section 5b)
Then, the data of the AC power output state is always displayed, and the user can check the AC power output state at any time.

On the other hand, during the period when the solar cell 1 does not produce DC power (eg, at night), even if the user desires to check the AC power output state for one day, the above-described state (when the solar cell 1 produces DC power). In this state, the state of the AC power output cannot be checked. In this case, the user operates the ON / OFF switch 6b of the operation switch unit 6 to ON. Then, a connection command is output to power storage means 11 in accordance with the ON operation of ON / OFF switch 6b. The power storage unit 11 that has received the connection command connects to the power conditioner 2 and outputs the stored DC power to the power conditioner 2. In the power conditioner 2, a control power supply for driving the power conditioner is created from the DC power output from the power storage means 11, and a part of the created control power supply is displayed on the display 3C as power for driving display (DC). Output. In the display 3C, the power conditioner 2 is controlled by the supplied DC power.
The data of the AC power output state is read out from and displayed on the display main body 5 (quantity display section 5a). Therefore, the user can check the AC power output state only when the user turns on the on / off switch 6b. When the check of the AC power output state is completed, the user turns off the on / off switch 6b. Then, the output of the connection command output to power storage means 11 is stopped in response to the operation of turning on / off switch 6b, so that power storage means 11 releases the connection with power conditioner 2 and stores the direct current stored in power conditioner 2. Stop power output. Therefore, the display on the display main body 5 ends. In this way, the display of the display main body 5 is performed only when necessary, so that waste of the power stored in the power storage unit 11 is suppressed.

Fourth Embodiment FIG. 6 is a configuration diagram of a photovoltaic power generation system according to the present embodiment.

The photovoltaic power generation system of this embodiment basically has the same configuration as that of the third embodiment, and the same or similar parts as those of FIGS. The reference numerals are used, and the description thereof is omitted.

This photovoltaic power generation system operates as an emergency backup power supply when the power supply 4
Is used. For this purpose, an independent operation output terminal (outlet) 12 is provided, and the control operation of the power conditioner 2 is slightly changed accordingly.

That is, the self-sustained operation output terminal 12 is an output terminal that is output from the output side of the power conditioner 2 in parallel with the system power supply 4, and is the output of the power conditioner 2 as necessary. The AC power is switched between the system power supply 4 side and the independent operation output terminal 12 side.

In the photovoltaic power generation system configured as described above, the following operation can be performed during a power failure. That is, at night, when the solar cell 1 stops producing power or when a power failure occurs in the system power supply 4, first, the user turns on / off the switch 6 b of the operation switch unit 6.
Is operated. Then, a connection command is output to power storage means 11 and power conditioner 2 in accordance with the ON operation of ON / OFF switch 6b. The power storage unit 11 receives the connection command, connects to the power conditioner 2, and outputs the stored DC power to the power conditioner 2.
In the power conditioner 2, a control power supply for driving the power conditioner is created from the DC power output from the power storage means 11, and a part of the created control power supply is displayed on the display 3C as power for driving display (DC). Output. The display 3C reads the AC power output state data from the power conditioner 2 using the supplied DC power, and displays the data on the display main body 5 (quantity display section 5a). Therefore,
The user can check the AC power output state only when the user turns on the on / off switch 6b. The above display operation is the same as in the third embodiment.

In the power conditioner 2 which has created a control power supply for driving the power conditioner, it is driven by the created control power supply, converts the input DC power of the power storage means 11 into AC power, and outputs it. At this time, the output end of the power conditioner 2 is switched to the independent operation output terminal 12 in response to the connection command, and the AC power generated by the power conditioner 2 is output to the independent operation output terminal 12. Therefore, at the time of a power failure of the system power supply 4, power can be taken out from the independent operation output terminal 12, and the taken out power can be used as a backup power supply.

In the above description, the on / off switch 6
When b is turned on, the DC power stored in the power storage means 11 is inevitably converted to AC power and output to the independent operation output terminal 12. However, the display 3C
A backup power output switch is provided in the operation switch section 6C, and only when this back power output switch is turned on, the DC power stored in the power storage means 11 is converted into AC power and output to the independent operation output terminal 12. It may be. Then, it becomes possible to selectively create a backup power supply based on the operation of the backup power output switch performed when the power supply of the system power supply 4 fails.
The waste of the DC power stored in the step can be suppressed.

In the embodiments described above, the present invention is applied to a photovoltaic power generation system. However, the present invention is applied to other distributed power supply systems such as a distributed power supply system using a fuel cell. It goes without saying that you can do it.

[0048]

As described above, according to the present invention, the power for the display operation can be constantly supplied from the system power supply irrespective of the power generation state by the solar cell. It is possible for the user to check the AC power output state at all times including the above, and the convenience is improved.

Further, if an operation section for controlling the power supply operation is further provided, the operation section is operated so as to supply the power required for the display operation only when it is desired to display the output data of the power conditioner. Thus, the power consumption required for the display operation can be suppressed to the minimum necessary, and power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a photovoltaic power generation system according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams illustrating respective indicators constituting the photovoltaic power generation system according to the first embodiment.

FIGS. 3A and 3B are diagrams illustrating respective indicators constituting a photovoltaic power generation system according to a second embodiment.

FIG. 4 is a diagram illustrating a configuration of a photovoltaic power generation system according to a third embodiment of the present invention.

FIGS. 5A and 5B are diagrams illustrating respective indicators constituting a photovoltaic power generation system according to a third embodiment.

FIG. 6 is a diagram illustrating a configuration of a photovoltaic power generation system according to a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Solar cell 2 Power conditioner 3A display 4 System power supply 5 Display main body 5a Quantity display part 5b Operation state display part 6A Operation switch part 7 Display power supply means 8 Storage part 9A Display control part 3B display 6B Operation switch part 6a Power supply Switch 9B Display control unit 10 Switch 3C Display 6C Operation switch unit 6b ON / OFF switch 9C Display control unit 11 Power storage unit 12 Independent operation output terminal

Claims (5)

[Claims] 1. A power conditioner display device having a function of displaying output data from a power conditioner, wherein power for the display operation is supplied from a system power supply side. 2. The display for a power conditioner according to claim 1, wherein the display for a power conditioner has a function of storing the output data. 3. The display for a power conditioner according to claim 1, further comprising an operation unit for controlling the power supply operation. 4. A power supply such as a solar cell or a fuel cell, a power conditioner for converting DC power generated by the power supply into AC power synchronized with a system power supply, and the display according to claim 1. A distributed power supply system comprising: 5. A power source such as a solar cell or a fuel cell, a power conditioner for converting DC power generated by the power source into AC power synchronized with a system power source, and output data of the power conditioner. And a power storage unit, wherein the power storage unit is configured to be able to supply power to the power conditioner in response to an external operation, and the power conditioner is configured to supply power from the power storage unit. Characterized in that the display device can be driven in response to the power supply.