JP2014155318A - Photovoltaic power generation facility and remote facility management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photovoltaic power generation facility capable of appropriately collecting measurement data even when installed in a desolate vacant space.SOLUTION: In a photovoltaic power generation facility 1, a serial-ethernet converter 5 converts measurement data showing a state value transmitted from a power conditioner 4 by serial communication into data based on an ethernet (R). A VPN router 7 transmits input data from the serial-ethernet converter 5 to a management device 11 through a virtual private network 6. Therefore, the measurement data is capable of being transmitted to the management device 11 located in a remote site without manpower as if the power conditioner 4 is connected to a PC in a local site. The serial-ethernet converter 5 and the VPN router 7 do not perform complicated processing compared to a PC so as to have a configuration unlikely influenced by an ambient electromagnetic wave, thereby being accommodated in, for example, the same housing 4a as for the power conditioner 4.

Description

  The present invention relates to a photovoltaic power generation facility that converts light energy into electric power, and a remote facility management system that manages the facility from a remote location.

  Conventionally, in a photovoltaic power generation facility, a solar cell module in which a plurality of solar cells are arranged and interconnected is installed in an unused space such as a roof or a wall, and a power conditioner is installed on the site of the building. A device that adjusts the generated electricity so that it can be used and a stable output was deployed, and various measurement data related to the input / output of the power conditioner was sent to the PC in the building ( For example, see Patent Document 1).

  In addition, in the equipment management system, a maintenance manager is required when consulting about a suspected problem in the operation status from a user such as a company, public facility, or general household where the photovoltaic power generation equipment is installed. Accordingly, a mode has been adopted in which measurement data stored in a PC in a building is sent from a user to a computer that can be viewed by a maintenance manager by e-mail or the like.

JP 2011-164015 A

By the way, with solar power generation facilities, the introduction to unmanned open space is starting to increase not only in buildings, but with social promotion for the purpose of burdening the environment.
However, with conventional solar power generation facilities, it is difficult to place a PC connected to the inverter in an open space if it is to be installed in an unoccupied open space. There is a problem that it becomes difficult to obtain data and the cost for maintenance may increase.

  The present invention has been made in view of the above problems, and a photovoltaic power generation facility capable of suitably collecting measurement data without constructing a building in which a PC is placed even when introduced into an unoccupied open space. The purpose is to provide a facility management system.

  In order to achieve the above object, the present invention provides at least a solar cell module that converts light energy into electric power, and collects power by converting input power from one or more solar cell modules into alternating current power of a predetermined voltage. A photovoltaic power generation facility provided with a power conditioner that supplies state to the panel and measures a state value related to at least one of the input power and AC power.

  In the present invention, the serial-Ethernet converter converts the measurement data indicating the state value sent from the power conditioner by serial communication into data conforming to Ethernet (registered trademark), and the VPN router -The input data from the Ethernet converter is configured to be transmitted to a predetermined management device connected via a virtual private network.

  In such a configuration, it is possible to transmit measurement data to a remote management device without human intervention as if the power conditioner is connected to a computer in the site.

  Since serial-Ethernet converters and VPN routers have a simple configuration compared to general computers such as PCs, they are less susceptible to ambient electromagnetic waves, temperature, humidity, etc. Can be housed in the same housing as the housing, or in the same housing as the cubicle that houses the current collector board, transformer board, power transmission board, etc. adjacent to the power conditioner.

Therefore, according to the present invention, measurement data can be suitably collected without constructing a building in which a PC is placed even when introduced into an unmanned open space.
In the present invention, the VPN router may be wired to the virtual private network, but it is preferable to wirelessly transmit the input data from the serial-Ethernet converter to the base station constituting the virtual private network. This is advantageous in that the cost for wiring can be reduced.

  Moreover, this invention can also be grasped | ascertained as a remote equipment management system provided with the above-mentioned photovoltaic power generation equipment and the management apparatus which manages the measurement data sent from this equipment via a virtual private network. According to such a system, since the maintenance data can be browsed by operating the management device or a computer accessible to the management device without requesting the user from the maintenance manager, the maintenance manager and the user are eventually required. Can be reduced.

  Note that in the present invention, the maintenance device may find a defect related to the photovoltaic power generation facility based on the measurement data browsed through the management device, but the management device uses the photovoltaic power generation based on the measurement data. Persons who perform failure diagnosis on equipment can reduce labor costs as much as it can reduce the labor of maintenance managers.

  In the latter configuration, when managing a plurality of photovoltaic power generation facilities, the management apparatus individually analyzes individual measurement data transmitted from these solar power generation facilities via a virtual private network. However, it may be more efficient to determine whether or not there is a problem with the photovoltaic power generation facility by comparing a plurality of measurement data with each other. For example, the processing load of the management device can be reduced when determining the presence or absence of defects related to a plurality of photovoltaic power generation facilities with similar installation environments.

  On the other hand, when the conditions regarding the installation environment are not satisfied, the management device determines whether the state value indicated by the measurement data is within the reference range corresponding to the installation environment of the photovoltaic power generation facility. By determining whether or not there is a problem with the photovoltaic power generation facility, the certainty in the failure diagnosis can be increased.

  Furthermore, the management device may variably set individual reference ranges related to determination based on the installation orientation and angle of the solar cell modules constituting the solar power generation facility as the installation environment of the solar power generation facility. . In this case, when performing failure diagnosis regarding the photovoltaic power generation facility, it is possible to appropriately determine the presence or absence of a defect by taking into account variations in measurement data that differ depending on the orientation of the solar cell module.

  Alternatively, in the configuration in which the solar power generation facility includes the solar radiation amount for measuring the solar radiation amount, the management device transmits the environmental data including the solar radiation amount as the installation environment of the solar power generation facility through the virtual private network from the solar power generation facility. The individual reference ranges relating to the determination may be variably set based on the amount of solar radiation acquired and included in the environmental data. In this case, when performing failure diagnosis on the photovoltaic power generation facility, it is possible to appropriately determine the presence or absence of a defect by taking into account variations in measurement data that vary depending on the weather and season.

  Further, in a configuration in which the photovoltaic power generation facility includes a thermometer for measuring the temperature, the management device acquires data including the temperature as environmental data from the photovoltaic power generation facility via a virtual private network, and the reference is based on the temperature. The range may be variably set. In this case, when performing a failure diagnosis on the photovoltaic power generation facility, it is possible to suitably determine the presence or absence of a defect by taking into account variations in measurement data that differ depending on the temperature.

  In addition, this invention can be used suitably also for power generation facilities other than a solar power generation facility. Specifically, the power generation device that converts energy into electric power, and the input power from one or more power generation devices are converted into alternating current power of a predetermined voltage and supplied to the current collector, and the input power and alternating current power The present invention can be applied to various power generation facilities including a conversion device that measures a state value related to at least one of them.

It is a block diagram which illustrates the structure of a solar power generation facility. It is a block diagram which illustrates the structure of an equipment management system. It is a flowchart which illustrates the processing content which a management apparatus performs.

Embodiments of the present invention will be described below with reference to the drawings.
<Configuration of solar power generation facilities>
As shown in FIG. 1, the photovoltaic power generation facility 1 of the present embodiment includes a solar cell array 2 installed in an open space, and a cubicle 3 by converting input power from the solar cell array 2 into AC power of a predetermined voltage. , A serial-Ethernet converter 5 serially connected to the communication port of the power conditioner 4, a VPN router 7 connected to the virtual private network 6, and a solarimeter 8 for measuring the amount of solar radiation. And a thermometer 9 for measuring the temperature.

  The solar cell array 2 includes a plurality of solar cell modules 2a arranged side by side, and a plurality of solar cell modules 2a are connected in series by wiring to form a solar cell string 2b, and further, the plurality of solar cell strings 2b. Are connected in parallel by wiring.

  Each solar cell module 2a constituting the solar cell array 2 is composed of a large number of solar cells (not shown) made of a PN junction semiconductor such as silicon, and these solar cells are connected in series or in parallel to form a rectangular flat plate. The other solar cell modules 2a and the light receiving surface are arranged in the same direction. Each solar cell constituting the solar cell module 2a absorbs sunlight energy (light energy) by its light receiving surface, generates an electromotive force at the PN junction, and outputs DC power via the electrode. Are well known.

  The power conditioner 4 is housed in a housing 4a installed near the solar cell array 2 in an open space, and is input with a random voltage from the solar cell array 2 (in other words, a plurality of solar cell modules 2a). This is a device that adjusts the power so that a stable usable output can be supplied to the cubicle 3 by converting the direct-current power to AC power having a predetermined constant voltage. The power conditioner 4 measures the current value, the voltage value, and the power value of the input power (that is, direct current power) from the solar cell array 2, and the output power (that is, the power conditioner 4). , AC power), at least the amount of power is measured.

  The cubicle 3 is housed in a housing 3 a adjacent to the power conditioner 4, and a current collection board 31 that collects the output from the power conditioner 4, and a transformer that boosts the power output from the current collection board 31. It is comprised by the board 32 and the power transmission board 33 which transmits the electric power boosted by the transformation board 32 to the commercial system of an electric power company.

  The power transmission panel 33 is also configured as a power reception panel that receives power supplied from the commercial system of the power company, and the transformer panel 32 is also configured to step down the power output from the power reception panel. . The current collector 31 is also configured as a power distribution board that distributes the power supplied by the solar cell array 2 or the power supplied from the commercial system of the power company to the electrical facilities that require power in the open space. Yes.

  The pyranometer 8 is an instrument that is installed in, for example, an outer frame for fixing the solar cell module 2a and measures the amount of solar radiation as a measure of the amount of light received by the solar cell module 2a. The data indicating the amount of solar radiation (hereinafter referred to as “environmental data”) is output to the serial-Ethernet converter 5 by generating an electrical signal corresponding to the amount of solar radiation using, for example.

  The thermometer 9 is an instrument that is installed in a location adjacent to the solar cell module 2a, for example, and measures the temperature in consideration of the temperature dependence of the solar cell module 2a in which the generated power increases as the temperature decreases. The environmental data shown is output to the serial-Ethernet converter 5.

  The serial-Ethernet converter 5 is housed in the housing 4a (see FIG. 1) together with the power conditioner 4 or in the housing 3a together with the cubicle 3, and various state values (specifically, measured by the power conditioner 4). Specifically, when data (hereinafter referred to as “measurement data”) indicating current value, voltage value, power value, power amount, etc.) is sent from the power conditioner 4 by serial communication, it is transmitted over a local area network (LAN). It has a simple configuration in which data is converted into usable Ethernet-compliant data and output to the VPN router 7. However, the serial-Ethernet converter 5 of this embodiment is also serially connected to the pyranometer 8 and the thermometer 9, and when environmental data is sent from the pyranometer 8 by serial communication, it is transferred to the Ethernet in the same manner as described above. The data is converted into conforming data and output to the VPN router 7 together with the measurement data. The serial-Ethernet converter 5 may be a multi-input (3 inputs in the present embodiment) and 1 output, or may be configured to have a plurality of 1-input and 1-output.

  The virtual private network 6 is a virtual network that connects LANs and the like using a communication network that is shared by a large number of subscribers instead of a fixed dedicated communication line of a communication partner. An Internet VPN is employed in which encrypted data is encapsulated (tunneled) and communicated between a plurality of sites via a network.

  The VPN router 7 is accommodated in the casing 4a (see FIG. 1) together with the power conditioner 4 and the serial-Ethernet converter 5, or in the casing 3a together with the cubicle 3 and the serial-Ethernet converter 5, and is connected to the serial-Ethernet. Data input from the converter 5 (in this embodiment, measurement data, environment data) is encrypted and encapsulated, and is sent to a management device 11 described later as a preset address destination via the virtual private network 6. It has a simple configuration that only transmits these data. However, the VPN router 7 of this embodiment is equipped with a wireless module for performing wireless communication in the base station 7a constituting the virtual private network 6, and wirelessly transmits various data to the base station 7a. Data is transmitted to the management apparatus 11 via the base station 7a connected to the mobile communication network and further via the Internet network connected to the base station 7a.

<Configuration of remote equipment management system>
Next, the remote equipment management system 10 of this embodiment is demonstrated.
As shown in FIG. 2, the remote facility management system 10 of this embodiment manages a plurality of photovoltaic power generation facilities 1 and measurement data sent from the plurality of solar power generation facilities 1 via the virtual private network 6. And a computer 15 that is communicably connected to the management device 11 via the virtual private network 6 and that is operated by a maintenance manager of the photovoltaic power generation facility 1. The computer 15 may be, for example, a personal computer (PC), a smartphone, a mobile phone, or the like. Hereinafter, the computer 15 is typically referred to as a PC 15.

  The management apparatus 11 according to the present embodiment is a server on the Internet, and receives the network I / F 12 for connecting to the Internet network including the virtual private network 6 and the photovoltaic power generation facility 1 via the network I / F 12. A storage unit 13 for storing measurement data and the like, and database processing for searching and extracting various data stored in the storage unit 13 in response to various requests received from the PC 15 via the network I / F 12, And a control unit 14 that performs a maintenance process for performing a failure diagnosis on the photovoltaic power generation facility 1 based on the measurement data.

  The storage unit 13 is composed of a plurality of hard disks, and each solar power generation facility 1 installation area, the types of solar cell modules 2a and power conditioners 4, the number of solar cell modules 2a installed, the installation direction, and the installation angle. Is stored (hereinafter referred to as “installation data”). And in the memory | storage part 13, the some solar power generation equipment 1 with which the content of these installation data is the same or approximates is grouped, and it sends from each solar power generation equipment 1 for every such group. The incoming measurement data (and environmental data) are stored in chronological order. However, when there is no other photovoltaic power generation facility 1 with the same or approximate contents of the installation data, the measurement data sent from the photovoltaic power generation facility 1 is time-sequentially formed without forming a group. It is designed to memorize individually along.

  The control unit 14 is mainly configured by a known microcomputer having a CPU, a ROM, a RAM, and the like. Among these, the CPU uses the RAM as a work area, for example, according to a program stored in the ROM, and performs the above-described database processing or Maintenance processing is executed.

<Maintenance processing>
Here, the maintenance process executed by the control unit 14 will be described in detail with reference to the flowchart of FIG. This process starts when the management apparatus 11 is turned on, and is repeatedly executed until the power is turned off.

  First, when this process is started, the control unit 14 (more precisely, the CPU) determines whether or not it is an execution timing preset in order to repeatedly perform this process at a predetermined cycle (S110). When the execution timing is reached (S110; YES), the process proceeds to the next step (S120). If it is determined that the execution timing is not reached (S110; NO), the process waits as it is.

  And in S120, by comparing each measurement data in the same group which consists of a plurality of photovoltaic power generation equipment 1 among the latest measurement data memorized by storage part 13, it is within the error range set up beforehand. Is determined to include all measurement data (various state values) in this group. If an affirmative determination is made here, the process proceeds to S130, and if a negative determination is made, the process proceeds to S140.

  That is, since it is estimated that the same measurement data is transmitted from the plurality of photovoltaic power generation facilities 1 in similar facility environments, if the contents of all the measurement data are close, If all the photovoltaic power generation facilities 1 are considered to be operating normally, and there are measurement data with significantly different contents, there may be a problem with the photovoltaic power generation facility 1 that is the source of the measurement data. It is considered that there is sex.

  In S130, data (hereinafter referred to as “alarm data”) for reporting that there is a high possibility that a failure has occurred in the photovoltaic power generation facility 1 that is the transmission source of the measurement data that was out of the error range in S120. Is transmitted to the PC 15 via the network I / F 12, and the process proceeds to S140. The alarm data includes measurement data in which a defect is detected and measurement data stored in the storage unit 13 before and after the detection. The subsequent maintenance manager identifies the failure location and analyzes the cause of the failure. Used for etc.

In S140, individual failure diagnosis is started in order for the photovoltaic power generation equipment 1 that does not belong to the group among the latest measurement data stored in the storage unit 13.
Specifically, in this individual failure diagnosis, for each photovoltaic power generation facility 1, based on the environmental data received together with the measurement data and the installation data stored in the storage unit 13, The measurement data is normal with the amount of solar radiation and temperature indicated by the environmental data, the model of the solar cell module 2a and the power conditioner 4 indicated by the installation data, the number of solar cell modules 2a, the installation direction and the installation angle as parameters. A reference range that can be considered as is set (S150). In addition, the table for setting the reference range which changes with every installation environment of such a solar power generation facility 1 is memorize | stored in the memory | storage part 13 beforehand, and the correlation with the said parameter in this table and a reference range is solar. It is determined in advance based on specifications of the battery module 2a and the power conditioner 4, past statistics, and the like.

  In the individual failure diagnosis, it is sequentially determined whether or not the measurement data (various state values) is within the reference range set in S150 for each photovoltaic power generation facility 1 (S160). When it is determined that all of the latest measurement data are within the reference range (S160; YES), the present process is terminated. On the other hand, when it is determined that there is measurement data that is outside the reference range, (S160; NO), the process proceeds to S170.

  In S170, the above-described alarm data indicating that there is a high possibility that a failure has occurred in the photovoltaic power generation facility 1 that is the transmission source of the measurement data that was out of the reference range in S160 is sent via the network I / F12. To the PC 15, and this process is terminated.

  According to such a process, for example, the PC 15 that has received the alarm data can notify the maintenance manager of the reception of the alarm data by outputting a predetermined alarm message or a warning sound. The measurement data added to the alarm data can be browsed by operating the PC 15.

<Effect>
As described above, in the photovoltaic power generation facility 1 according to the present embodiment, the serial-Ethernet converter 5 converts the measurement data indicating the state value sent from the power conditioner 4 by serial communication into data according to Ethernet. The VPN router 7 is configured to transmit the input data from the serial-Ethernet converter 5 to the management apparatus 11 connected via the virtual private network 6.

  In such a configuration, it is possible to transmit the measurement data to the remote management device 11 without manual intervention, as if the power conditioner 4 is connected to a computer in the site.

  Further, the serial-Ethernet converter 5 and the VPN router 7 have a configuration that is less susceptible to the influence of surrounding electromagnetic waves, temperature, humidity, and the like as compared with a computer such as the management device 11 and the PC 15 because it does not perform complicated processing. Therefore, it can be housed in the same housing 4 a as the power conditioner 4.

  Therefore, according to the configuration of the photovoltaic power generation facility 1, a device for suitably collecting measurement data is preferably used without constructing a building in which a computer such as the PC 15 is placed even in introduction into an unmanned open space. Can be installed. Further, in the photovoltaic power generation facility 1, since the wireless module is mounted on the VPN router 7, the installation cost can be reduced as much as it is not necessary to prepare a wiring for transmitting data to the management device 11.

  In the remote facility management system 10 of the present embodiment, the measurement data is transmitted from the photovoltaic power generation facility 1 via the virtual private network 6, and the management device 11 accessible to the maintenance manager's PC 15 stores the measurement data. Accumulation reduces the risk of information leakage, and the maintenance manager can easily view these measurement data as needed.

  Moreover, in the remote equipment management system 10 of this embodiment, the management apparatus 11 performs failure diagnosis regarding the photovoltaic power generation equipment 1 based on the measurement data, and when the possibility of malfunction is found, alarm data is sent to the maintenance manager. Since it transmits to PC15, when there exists a malfunction, it can contact the user of the equipment management system 10 from a maintenance manager, and it can lead to improvement of a service by extension.

<Other embodiments>
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is possible to implement in various aspects.

  For example, in the photovoltaic power generation facility 1 of the above embodiment, a plurality of solar cell modules 2a are installed as the solar cell array 2. However, the present invention is not limited to this, and only one solar cell module 2a is installed. An aspect may be sufficient.

  Moreover, in the remote equipment management system 10 of the said embodiment, although the management apparatus 11 is the aspect which manages the measurement data sent from the solar power generation equipment 1, in detail, the management apparatus 11 is a solar power generation equipment. When the power conditioner 4 in the photovoltaic power generation facility 1 receives this transmission request, the management device 11 transmits the measurement data to the management device 11. The aspect which manages the measurement data sent from the photovoltaic power generation equipment 1 may be sufficient.

  In the remote facility management system 10 of the above embodiment, the installation data is stored in the management device 11 in advance. However, the present invention is not limited to this, and the management device 11 acquires the installation data from the solar power generation facility 1. May be configured. In this case, the photovoltaic power generation facility 1 includes, for example, various sensors that detect the installation orientation and angle of the solar cell module 2 a, and installation data is input from these sensors to the VPN router 7 via the serial-Ethernet converter 5. Then, the VPN router 7 may transmit the installation data together with the measurement data to the management apparatus 11 via the virtual private network 6.

  Moreover, in the remote equipment management system 10 of the said embodiment, since the maintenance process which the control part 14 of the management apparatus 11 performs is an example to the last, it is not limited to this, For example, the photovoltaic power generation equipment used as management object The failure diagnosis may be performed individually in all the photovoltaic power generation facilities 1 without grouping 1, or more specifically, the measurement data may be accumulated without performing the maintenance process.

  Moreover, in the remote equipment management system 10 of the said embodiment, although the server which PC15 can access was illustrated as the management apparatus 11, it is not restricted to this, For example, without passing through a server, from the solar power generation equipment 1 The measurement data may be directly transmitted to the PC 15.

  In addition, in the remote equipment management system 10 of the said embodiment, although the management apparatus 11 illustrated the structure which manages the several solar power generation equipment 1, it is not limited to this, One solar power generation equipment 1 is shown. It may be configured to manage.

  Furthermore, in the remote equipment management system 10 of the above embodiment, the configuration in which the photovoltaic power generation equipment 1 is managed by the management device 11 in a remote place is exemplified. Can be applied to. For example, in the remote facility management system 10, a power generation facility having a configuration in which a conversion device such as a power conditioner 4 is connected to a power generation device that generates power by converting various water flows from a small water source into electric power as energy. May be managed by the management device 11 at a remote location.

  DESCRIPTION OF SYMBOLS 1 ... Solar power generation equipment, 2 ... Solar cell array, 2a ... Solar cell module, 2b ... Solar cell string, 3 ... Cubicle, 4 ... Power conditioner, 3a, 4a ... Case, 5 ... Ethernet converter, 6 ... Virtual private network, 7 ... VPN router, 7a ... Base station, 8 ... Solar meter, 9 ... Thermometer, 10 ... Remote equipment management system, 11 ... Management device, 12 ... Network I / F, 13 ... Storage unit, 14 ... Control unit, 15 ... PC, 31 ... current collector panel.

Claims (10)

A solar cell module that converts light energy into electric power;
A power conditioner that converts input power from one or more of the solar cell modules into AC power having a predetermined voltage and supplies the AC power to a current collector, and measures a state value related to at least one of the input power and the AC power; ,
A serial-Ethernet converter that converts the measurement data indicating the state value sent from the power conditioner by serial communication into data conforming to Ethernet (registered trademark);
A VPN router for transmitting input data from the serial-Ethernet converter to a predetermined management device connected via a virtual private network;
Solar power generation facility comprising.   2. The photovoltaic power generation facility according to claim 1, wherein the VPN router wirelessly transmits input data from the serial-Ethernet converter toward a base station constituting a virtual private network. The photovoltaic power generation facility according to claim 1 or 2,
A management device for managing measurement data sent from the solar power generation facility via a virtual private network;
A remote equipment management system.   The remote management system according to claim 3, wherein the management device performs a failure diagnosis on the photovoltaic power generation facility based on the measurement data.   The said management apparatus determines the presence or absence of the malfunction regarding the said photovoltaic power generation equipment by comparing the measurement data sent via a virtual private network from the said several photovoltaic power generation equipment. Item 5. The remote equipment management system according to Item 4.   The management device determines whether or not there is a problem with the photovoltaic power generation facility depending on whether or not the state value indicated by the measurement data is within a reference range corresponding to an installation environment of the photovoltaic power generation facility. The remote equipment management system according to claim 4 or 5.   The said management apparatus variably sets the said reference | standard range as an installation environment of the said photovoltaic power generation equipment based on the installation azimuth | direction and angle of the solar cell module which comprises this photovoltaic power generation equipment. The remote equipment management system described in 1. The solar power generation facility includes a pyranometer for measuring the amount of solar radiation,
The management device acquires environmental data including the solar radiation amount as an installation environment of the solar power generation facility from the solar power generation facility via a virtual private network, and based on the solar radiation amount included in the environmental data The remote facility management system according to claim 6 or 7, wherein the reference range is variably set. The solar power generation facility includes a thermometer for measuring temperature,
The management device acquires environmental data including the temperature as an installation environment of the solar power generation facility from the solar power generation facility via a virtual private network, and based on the temperature included in the environmental data, The remote facility management system according to any one of claims 6 to 8, wherein the reference range is variably set. A power generation device for converting energy into electric power;
A converter that converts input power from one or more of the power generators into alternating current power of a predetermined voltage and supplies it to a current collector, and measures a state value related to at least one of the input power and the alternating current power;
A serial-Ethernet converter that converts measurement data indicating the state value sent from the conversion device by serial communication into data according to Ethernet;
A VPN router for transmitting input data from the serial-Ethernet converter to a predetermined management device connected via a virtual private network;
A management device for managing measurement data sent from the VPN router via the virtual private network;
A remote equipment management system.

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