JP2018102086A - System for monitoring photovoltaic power generation system, method for monitoring photovoltaic power generation system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for monitoring a photovoltaic power generation system, which is simple in structure and capable of collecting data about power generation by a string with the simultaneity ensured therein.SOLUTION: A system 1 for monitoring a photovoltaic power generation system having a plurality of solar battery strings 10 comprises: power generation data-measurement units 4 for measuring power generation data of the plurality of solar battery strings 10; and a power generation data accumulation unit 2 for collecting and accumulating power generation data. In the photovoltaic power generation system monitoring system 1, the power generation data-measurement units 4 each have at least a measurement unit control part 5 and a power generation data storage part 6. The power generation data accumulation unit 2 has at least an accumulation unit control part 3 for sending signals for controlling the measurement of power generation data. The accumulation unit control part 3 sends an interruption signal to the power generation data-measurement units 4. When receiving the interruption signal, the measurement unit control part 5 suspends measurement or storing of power generation data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solar power generation system monitoring system that collects information related to the output of each solar cell string in a solar power generation system including a plurality of solar cell strings to which a plurality of solar cells are connected.

  In recent years, photovoltaic power generation systems have attracted attention as an alternative energy source for fossil fuels, and various photovoltaic power generation systems have been developed and installed in various places. In general, a photovoltaic power generation system converts a solar cell string in which a plurality of solar cells are connected (hereinafter, the solar cell string is also simply referred to as “string”), and converts power from the string into desired power. It is mainly composed of a power converter composed of an inverter and a converter.

  This solar power generation system is generally provided with a monitoring system that measures information related to the output of each string, such as the amount of power generation, and collects and monitors the power generation status of the solar power generation system in a batch. ing. This monitoring system mainly includes a plurality of monitoring devices that measure power generation information such as output voltage, output current, and output power of each string, and a data logger that collects power generation information measured by the monitoring device.

  The power generation information of each string collected by such a monitoring system includes, for example, a failure and abnormality diagnosis that detects a string where the power generation amount is reduced and identifies a failure or an abnormal part, a shadow caused by a surrounding obstacle, etc. It is used to evaluate environmental factors that affect solar power generation. Moreover, it is used also for control of the power converter device etc. which are performed in order to perform efficient solar power generation, such as maximum power point tracking control (MPPT).

  In order to properly perform such diagnosis of solar power generation systems, evaluation of environmental factors, and control of power conversion devices, etc. using the power generation information collected by the monitoring system described above, data loggers collectively collect them. The power generation information of all strings needs to be measured at the same time. In other words, all the power generation information collected by the data logger is a method or system for diagnosing the above-mentioned failure, evaluating environmental factors, controlling the power converter, etc. It is necessary to be measured within a predetermined time that can be treated as power generation information measured at the same time. This is because the output of the solar cell changes with time depending on the sunshine time, the surface temperature of the solar cell, etc., so that the above-mentioned control system etc. cannot accept the time difference between the actual measurement times of each power generation information. This is because when the collected power generation information is present, proper evaluation and control cannot be performed. In the following explanation, the power generation information collected so that this control system etc. can be treated as measured at the same time is also referred to as power generation information that ensures synchronization, and such power generation information The state that can be collected is also described as the state where simultaneity is ensured.

  Normally, when a data logger collects information from a plurality of monitoring devices, the data logger is connected to each monitoring device, the data logger communicates with each monitoring device according to a known communication standard, and each power generation information is obtained. collect. When communication between this monitoring device and the data logger is performed at high speed, even if many monitoring devices are connected to the data logger, the collection time of power generation information by the data logger becomes a problem. There is no. However, a large-scale photovoltaic power generation system such as a mega solar power plant has a very large number of strings, so even if a high-speed communication environment is prepared and power generation information is collected, the power generation of all monitoring devices It may take a long time to finish collecting information. In addition, since the solar power generation system is installed outdoors, it may be difficult to provide a high-speed communication environment, and it may take time to collect all power generation information. In such cases, the actual measurement time of the collected power generation information may cause a time difference that the control system or the like cannot tolerate, resulting in a problem that the synchronism of the power generation information cannot be ensured. .

  In addition, when installing a monitoring system retrofitting to an existing photovoltaic power generation system that does not have a monitoring system, it is difficult to install a cable for communication. The monitoring device may communicate. In this case, since the communication speed of wireless communication is slower than that of wired communication, there arises a problem that it is difficult to ensure the synchronism of power generation information.

  As means for solving such a problem, there is known a measurement system in which each monitoring device is equipped with a radio timepiece and a data logger collects information on each monitoring device (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2007-18211

  In such a measurement system, the measurement data measured by the monitoring device is recorded in association with the time data from the radio clock, so if the measurement data is arranged based on the time data, simultaneous measurement data can be obtained. Can do. However, in such a measurement system, it is necessary to provide each monitoring device with a radio timepiece, and there is a problem that the system becomes complicated. In addition, if the monitoring device must be installed in a place where it is difficult to collect radio waves for obtaining the reference time, the time of the radio clock will shift, and there will be a problem that the synchronization of the collected information cannot be ensured. It was. Also, if each monitoring device is equipped with a high-precision clock, there is no need to acquire a reference time signal by radio waves, etc., and there will be no impact on the installation environment, but the monitoring device will be expensive. There was also.

  The present invention has been made to solve the above-described problems, and provides a monitoring system for a photovoltaic power generation system capable of collecting power generation information of a string with a simple configuration and ensuring synchronization. Objective.

In order to achieve the above object, the present invention provides the following means.
The monitoring system for a photovoltaic power generation system of the present invention is a monitoring system for a photovoltaic power generation system having a plurality of solar cell strings to which solar cells are connected, and is power generation information that is information relating to the output of the predetermined solar cell string. A power generation information measuring unit for measuring the power generation information and a power generation information integration unit for collecting and accumulating the power generation information measured by the power generation information measurement unit, wherein the power generation information measurement unit stores the measured power generation information. And a measurement unit control unit that controls measurement of the power generation information and storage of the power generation information in the power generation information storage unit, and the power generation information integration unit includes the power generation information in the power generation information measurement unit. Integration for transmitting information measurement or a signal for controlling storage of the power generation information to the power generation information measurement unit At least a knit control unit, and the integrated unit control unit transmits an interruption signal, which is a signal for interrupting the measurement of the generation information or the storage to the generation information storage unit, to a plurality of the generation information measurement units. The measurement unit control unit of the power generation information measurement unit that has received the interruption signal interrupts the measurement of the power generation information or the storage in the power generation information storage unit based on the interruption signal.

  According to the monitoring system of the solar power generation system of the present invention, the power generation information measurement unit provided in each solar cell string measures the power generation information of each solar cell string, and the measured power generation information is stored in the power generation information storage unit. Remember. Then, the integrated unit control unit of the power generation information measurement unit transmits an interruption signal for interrupting the measurement of the power generation information or storage in the power generation information storage unit to each power generation information measurement unit. The information measurement unit that has received the interruption signal interrupts the measurement of the power generation information or the storage of the power generation information in the power generation information storage unit.

  In the above invention, the measurement unit control unit further transmits the power generation information stored in the power generation information storage unit to the power generation information integration unit, and the measurement unit control unit transmits the power generation information to the power generation information integration unit. It is preferable that measurement of the power generation information or storage in the power generation information storage unit is resumed after transmission to the power generation information integration unit.

  In this way, the measurement unit control unit of the power generation information measurement unit automatically transmits the stored power generation information to the power generation information integration unit, and then automatically measures the power generation information that has been interrupted, or the power generation information storage unit. Resuming storage of power generation information.

  In the above invention, the measurement unit control unit further transmits the power generation information stored in the power generation information storage unit to the power generation information integration unit, and the integrated unit control unit includes the power generation information measurement unit. After receiving the power generation information from the power generation information, the power generation information is transmitted to the power generation information measurement unit, a restart signal for notifying the measurement of the power generation information or the resumption of storage in the power generation information storage unit, and the power generation information that has received the restart signal The measurement unit control unit of the measurement unit preferably restarts the measurement of the power generation information or the storage in the power generation information storage unit based on the restart signal.

  In this way, the integrated unit control unit of the power generation information integration unit receives the power generation information from the power generation information measurement unit and then restarts the measurement of the power generation information or the restart of storage in the power generation information storage unit. Is transmitted to the power generation information measurement unit. Then, the power generation information measurement unit that has received the restart signal restarts the measurement of the power generation information that has been interrupted or the storage of the power generation information in the power generation information storage unit.

  In the above invention, the measurement unit control unit further transmits the power generation information stored in the power generation information storage unit to the power generation information integration unit, and the integrated unit control unit includes a plurality of the power generation information After transmitting the interruption signal to the measurement unit, further transmitting a transmission instruction signal which is a signal for transmitting the power generation information stored in the power generation information storage unit to the power generation information integration unit, and transmitting the transmission instruction signal The measurement unit controller of the received power generation information measurement unit preferably transmits the power generation information to the power generation information integration unit based on the transmission instruction signal.

  In this way, the integrated unit control unit transmits an interruption signal to cause the power generation information measurement unit to interrupt the measurement of power generation information or storage in the power generation information storage unit, and then is stored in the power generation information storage unit. A transmission instruction signal for transmitting the generated power generation information is transmitted to the power generation information measuring unit. The measurement unit controller that has received the transmission instruction signal transmits power generation information to the power generation information integration unit based on the transmission instruction signal.

  In the above invention, it is preferable that the measurement unit controller adds a response signal as a response to the interruption signal to the power generation information transmitted to the power generation information integration unit.

By doing in this way, the power generation information to which the response signal indicating that it is the power generation information collected when receiving the interruption signal is transmitted to the power generation information accumulation unit.
In the above invention, it is preferable that transmission / reception of signals between the power generation information measurement unit and the power generation information integration unit is performed by wireless communication.

By doing so, communication between the power generation information measurement unit and the power generation information integration unit is performed by wireless communication.
The method for monitoring a solar power generation system according to the present invention is a method for monitoring a solar power generation system having a plurality of solar cell strings to which solar cells are connected, and is a power generation information measuring unit installed in the solar cell string. Measuring the power generation information related to the output of the solar cell string, storing the measured power generation information in a power generation information storage unit provided in the power generation information measurement unit, and collecting the power generation information and accumulating the power generation information A step of suspending measurement of the plurality of power generation information by the power generation information measurement unit or storage in the power generation information storage unit based on an interruption signal transmitted from the unit; It is a monitoring method.

  The program of the present invention collects and stores the power generation information measurement unit that measures power generation information that is information related to the output of a plurality of solar cell strings to which solar cells are connected, and the power generation information measured by the power generation information measurement unit A power generation information measurement unit that measures power generation information that is information related to the output of the predetermined solar cell string in an electronic computing device; A power generation information storage function for storing the measured power generation information in a power generation information storage unit, and measurement of the power generation information based on the interruption signal received from the power generation information integration unit, or storage in the power generation information storage unit This is a program for realizing the interrupt function to interrupt.

  The program of the present invention measures power generation information, which is information related to the output of a plurality of solar cell strings connected to solar cells, and stores it in a power generation information storage unit, and the power generation information measurement unit measures A program of the power generation information integration unit in a photovoltaic power generation system having a power generation information integration unit that collects and stores the generated power generation information, wherein the power generation information is stored in a computer with respect to a plurality of power generation information measurement units. It is a program for realizing an interruption function for transmitting an interruption signal for interrupting measurement or storage in the power generation information storage unit.

  According to the monitoring system of the solar power generation system of the present invention, when the power generation information measurement unit provided in each solar cell string receives an interruption signal from the integrated unit control unit of the power generation information integration unit, The storage of the measured power generation information in the power generation information storage unit is interrupted. At this time, the power generation information storage unit stores the power generation information immediately before receiving the interruption signal. For this reason, there is an effect that it is possible to collect the power generation information of the string in which the synchronization is ensured.

1 is an overall block diagram of a monitoring system for a photovoltaic power generation system according to an embodiment of the present invention. 1 is an overall block diagram of a monitoring system for a photovoltaic power generation system according to an embodiment of the present invention using wireless communication. It is a flowchart which shows the flow of the whole process of the monitoring system of the solar energy power generation system concerning one Embodiment of this invention. Fig.4 (a) is a flowchart which shows the flow of a process of the electric power generation information measurement unit of the monitoring system of the solar energy power generation system concerning one Embodiment of this invention. FIG.4 (b) is a flowchart which shows the flow of a process of the electric power generation information integration unit of the monitoring system of the solar power generation system concerning one Embodiment of this invention. Fig.5 (a) is a flowchart which shows the flow of a process of the electric power generation information measurement unit of the monitoring system of the solar energy power generation system concerning one Embodiment of this invention. FIG.5 (b) is a flowchart which shows the flow of a process of the electric power generation information integration unit of the monitoring system of the solar power generation system concerning one Embodiment of this invention. Fig.6 (a) is the schematic of the data transmitted / received between the electric power generation information measurement unit of the photovoltaic power generation system concerning one Embodiment of this invention, and an electric power generation information integration unit. FIGS. 6B to 6C are examples of signals transmitted by the power generation information integration unit of the solar power generation system according to the embodiment of the present invention. FIG.6 (d) is an example of the signal which the power generation information measurement unit of the solar power generation system concerning one Embodiment of this invention transmits. FIGS. 6E to 6F are examples of signals transmitted by the power generation information integration unit of the solar power generation system according to the embodiment of the present invention.

A monitoring system for a photovoltaic power generation system according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
The monitoring system 1 of the photovoltaic power generation system of the present invention (hereinafter also referred to as the monitoring system 1) includes monitoring devices 4a to 4x connected to a plurality of strings 10a to 10x each including a plurality of solar cells 11. The data logger 2 mainly accumulates information of each string measured by the monitoring devices 4a to 4x. In the following description, the monitoring devices 4a to 4x are collectively referred to as the monitoring device 4 and the strings 10a to 10x are collectively referred to as the string 10.

  The data logger 2 and the monitoring device 4 are serially connected (daisy chain connection) in a wired manner, and communication between the data logger 2 and the monitoring device 4 is performed according to a well-known communication standard RS485. This communication may be performed according to other known communication standards.

The monitoring device 4 in the present embodiment is a power generation information measurement unit in the claims. The data logger 2 is a power generation information integration unit in the claims.
<Description of functions of monitoring device 4>
The monitoring devices 4a to 4x are connected to the strings 10a to 10x, respectively, and a power generation information measurement unit that measures power generation information that is information related to the output of the strings such as output voltage, output current, and output power of the connected strings 10a to 10x. It is. The monitoring devices 4a to 4x are installed in connection boxes of strings 10a to 10x (not shown). Note that the monitoring device 4 may measure information such as the output temperature, the output current, the output power, the surface temperature of the solar cell 11 of the string 10, the temperature of the back surface, and the temperature inside the junction box as power generation information. Good.

  The monitoring devices 4a to 4x include measurement control units 5a to 5x that collect power generation information of the connected strings 10a to 10x, and a power generation information storage unit 6a that stores the power generation information measured by the measurement control units 5a to 5x. ~ 6x respectively. Hereinafter, the measurement control units 5a to 5x are collectively referred to as the measurement control unit 5, and the power generation information storage units 6a to 6x are collectively referred to as the power generation information storage unit 6.

  In addition to the power generation information measurement function for measuring the power generation information of the connected string 10, the measurement control unit 5 has a measurement interruption function for interrupting the measurement of power generation information in accordance with an interruption signal 34 transmitted from the data logger 2 described later. doing. The measurement control unit 5 also has a power generation information transmission function for transmitting the power generation information stored in the power generation information storage unit 6 to the data logger 2 according to an instruction from the data logger 2 after interrupting the measurement. Further, it has a function of receiving the restart signal 36 instructing the restart of the measurement transmitted from the data logger 2 and restarting the measurement. Note that the measurement control unit 5 automatically transmits the power generation information stored in the power generation information storage unit 6 to the data logger 2 instead of the function of restarting the measurement after receiving the restart signal 36. You may have the automatic measurement restart function which restarts.

  The power generation information storage unit 6 is an information storage unit configured by a known memory, a register, and the like, and is a part that stores the power generation information measured by the measurement control unit 5. The power generation information stored in the power generation information storage unit 6 can be read by the measurement control unit 5.

The measurement control unit 5 in the present embodiment is a measurement unit control unit in the claims. The power generation information storage unit 6 is a power generation information storage unit in the claims.
<Description of data logger 2 functions>
The data logger 2 is an information accumulation unit that accumulates power generation information measured by the monitoring device 4 connected to each string 10. The data logger 2 includes at least an integrated unit controller 3 that controls each monitoring device 4.

  The integrated unit control unit 3 has a function of transmitting to each monitoring device 4 an interruption signal 34 for instructing interruption of measurement of the power generation information at a predetermined timing. The integrated unit controller 3 broadcasts the interruption signal 34 to all the monitoring devices 4 in principle. In addition, the measurement control part 5 which received this interruption signal 34 interrupts the measurement of electric power generation information by the above-mentioned measurement interruption function.

  In addition, the integrated unit control unit 3 transmits the interruption signal 34, and then transmits a power generation information stored in the power generation information storage unit 6 to the specific monitoring device 4 to transmit to the data logger 2. 35 is also transmitted. In addition, the measurement control part 5 which received this transmission instruction | indication signal 35 transmits the electric power generation information memorize | stored in the electric power generation information storage part 6 to the data logger 2 by the above-mentioned electric power generation information transmission function.

  Furthermore, the integrated unit control unit 3 also has a measurement resumption signal transmission function for transmitting a resumption signal 36 for notifying the resumption of measurement of power generation information to all the monitoring devices 4. If the measurement control unit 5 has the above-described automatic measurement restart function, the integrated unit control unit 3 may not have this measurement restart signal transmission function.

  The data logger 2 may include a storage unit (not shown) for storing the power generation information received from the monitoring device 4. Further, the data logger 2 may have a communication interface (not shown) or the like, and may transmit the received power generation information to an external information processing device, an external information storage device, or the like.

  In the present embodiment, as shown in FIG. 1, the data logger 2 and the monitoring devices 4a to 4x are described as being applied to an example in which they are serially connected with each other and communicate with each other. 2 and the monitoring devices 4a to 4x may each further include a wireless communication interface, and mutual communication may be performed by wireless communication. Specifically, the data logger 2 may have a wireless interface 14 and the monitoring devices 4a to 4x may have wireless interfaces 13a to 13x, respectively (see FIG. 2). In this case, transmission / reception of information between the data logger 2 and the monitoring devices 4a to 4x is performed by wireless communication by the wireless interface 14 and the wireless interfaces 13a to 13x.

The monitoring device 4 is given address information ADD: 00 to ADD: XX, which is identification information for identifying each, and this address information is stored in the measurement control unit 5 or data logger of each monitoring device 4. Are stored in the two integrated unit control units 3 or storage units (not shown).
<Description of communication signal between data logger 2 and monitoring device 4>
As described above, the data logger 2 and the monitoring device 4 communicate with each other according to a known communication standard. In the present embodiment, the data logger 2 and the monitoring device 4 are applied to an example in which communication is performed with RS485, which is a known communication standard, and the following description will be given. Here, the transmission / reception information 30 transmitted / received between the data logger 2 and the monitoring device 4 will be described with reference to FIG. 6A. The transmission / reception information 30 includes the header information unit 31 and the identification information of each monitoring device 4. It is mainly composed of an address information section 32 including certain address information and an information section 33 including a command indicating the content of an instruction and data to be transmitted.
<Description of process flow of monitoring system 1 of solar power generation system>
Next, mainly referring to FIGS. 3 to 5, the operation of the monitoring system 1 will be described in accordance with the flow of actual processing. In this embodiment, each part of the monitoring device 4 and the data logger 2 is realized by cooperation of a storage medium such as a CPU and a memory, hardware such as an interface, and a program stored in the storage medium. However, each unit may be configured by dedicated hardware.

First, the overall processing flow of the monitoring system 1 will be described with reference to FIG.
In the present embodiment, ADD: 01 is assigned to the monitoring device 4a as address information, ADD: 02 is assigned to the monitoring device 4b as address information, and thereafter, the address information is sequentially assigned to each monitoring device 4 in the same manner. The following description is applied to an example in which ADD: XX is assigned as address information. Further, the monitoring devices 4a to 4x are applied to an example having a measurement automatic restart function that automatically restarts the measurement after transmitting the power generation information stored in the power generation information storage unit 6 to the data logger 2. And explain.

  The monitoring system 1 starts its processing when the system is started or by an instruction signal input by an administrator of the monitoring system 1 or the like (S10). When the process is started in S10, the monitoring device 4 starts measuring the power generation information of the connected string 10 (S11). Specifically, the measurement control unit 5 of the monitoring device 4 measures the power generation information of the connected string 10.

  When the measurement control unit 5 measures the power generation information, the power generation information storage unit 6 stores the measured power generation information (S12). Since the measurement control unit 5 continuously measures the power generation information, the information stored in the power generation information storage unit 6 is rewritten to the latest information as needed.

  The data logger 2 broadcasts an interruption signal 34 for instructing all the monitoring devices 4 to interrupt the measurement at a predetermined timing predetermined by an administrator of the monitoring system 1 or the like. Specifically, the integrated unit control unit 3 of the data logger 2 sets the address information unit 32 to address information ADD: FF indicating broadcast transmission, and includes an interruption signal including an interruption command command that instructs the information unit 33 to interrupt measurement. 34 (see FIG. 6B) is transmitted. The measurement control units 5a to 5x that have received the interruption signal 34 refer to the address information unit 32 and the value thereof is ADD: FF. It is determined that there is, and the measurement is interrupted (S13).

  When the measurement control unit 5 interrupts the measurement in S13, the data logger 2 sequentially collects the power generation information stored in the power generation information storage unit 6 from each monitoring device 4 (S14). Specifically, the integrated unit control unit 3 transmits a transmission instruction signal 35 in which the address of a specific monitoring device 4 is described in the address information unit 32, and the power generation information storage unit in the monitoring device 4 having the address. The power generation information stored in 6 is transmitted. After transmitting the power generation information stored in its power generation information storage unit 6 to the data logger 2, the monitoring device 4 restarts the measurement of the power generation information by the automatic measurement restart function (S11).

Next, mainly referring to FIG. 4, the operation of the data logger 2 and the monitoring device 4 will be described in accordance with actual processing. First, the monitoring device 4 will be described, and then the data logger 2 will be described.
<Operation of monitoring device 4>
In the following description, the operation of the monitoring device 4a will be described as an example, but the operation of the other monitoring devices 4b to 4x is the same.

  When the monitoring system 1 is activated, the monitoring device 4a starts processing (S100), and starts measuring the power generation information of the connected string 10a (S110). When the measurement control unit 5a measures the power generation information in S110, the power generation information storage unit 6a stores the measured power generation information (S120). If the measurement control unit 5a does not receive the interruption signal 34 from the data logger 2 (No in S130), the measurement control unit 5a continues to measure the power generation information (S110).

  On the other hand, when receiving the interruption signal 34 transmitted from the data logger 2 (Yes in S130), the measurement control unit 5a interrupts the measurement (S140). At this time, the power generation information storage unit 6a stores the power generation information immediately before the measurement control unit 5a interrupts the measurement.

  After interrupting the measurement, the measurement control unit 5a receives the transmission instruction signal (see FIG. 6 (e)) in which the address information ADD: 01 which is the identification information of the monitoring device 4a is included in the address information unit 32. (Yes in S150), the power generation information data 40 stored in the power generation information storage unit 6a is transmitted to the data logger 2 (S160).

  Here, the power generation information data 40 transmitted in S160 will be described with reference to FIG. 6D. In the address information section 32 of the power generation information data 40, the address information of the monitoring device 4a that measured the power generation information. ADD: 01, the information unit 33 includes power generation information data measured by the measurement control unit 5a. In addition, when transmitting the power generation information data 40, the measurement control unit 5a gives an interruption flag 41 indicating that the monitoring device 4a has received the interruption signal 34 (see FIG. 6D). Send. This interruption flag 41 is a response signal in the claims.

  On the other hand, when the monitoring apparatus 4a does not receive the transmission instruction signal including ADD: 01, which is its own address (No in S150), the monitoring apparatus 4a waits as it is until it receives a signal including ADD: 01, which is its own address. .

  When transmitting the power generation information data 40 in S160, the measurement control unit 5a starts measuring the power generation information again by the above-described automatic measurement restart function (S110), and thereafter repeats the processes of S120 to S160 described above.

  The monitoring devices 4a to 4x do not return a response to the interruption signal 34 to the data logger 2 even if the interruption signal 34 is received in S130. In other words, the monitoring devices 4a to 4x do not notify that the interruption signal 34 has been correctly received. As described above, since the interruption signal 34 is broadcasted to all the monitoring devices 4 as described above, when the monitoring device 4 that has received the interruption signal 34 returns a response signal to the data logger 2, the response signal is This is because there is a possibility that communication speed delays and communication failures occur due to concentration and frequent collisions.

  As described above, the monitoring device 4a may have a function of receiving the restart signal 36 from the data logger 2 and restarting the measurement instead of the automatic measurement restart function. This case will be described with reference to FIG. In FIG. 5, the processing of S100 to S150 is the same as that of FIG.

After transmitting the power generation information data 40 in S160, the measurement control unit 5a confirms whether or not the restart signal 36, which is a signal for instructing restart of the measurement suspended from the data logger 2, is transmitted (S170). If the measurement control unit 5a does not receive the restart signal 36 (No in S170), the measurement control unit 5a waits until the restart signal 36 is received. If the restart signal 36 is received, the measurement control unit 5a restarts the measurement of the power generation information. (S110). Thereafter, the monitoring device 4 repeats the processes of S110 to S170.
<Operation of data logger 2>
Next, the operation of the data logger 2 will be described with reference to FIG.

  When the monitoring system 1 is activated, the data logger 2 starts processing (S200), and an interruption signal for instructing each monitoring device 4 to interrupt measurement at a predetermined timing predetermined by the administrator of the monitoring system 1 or the like. 34 is transmitted (S210). Specifically, the integrated unit control unit 3 of the data logger 2 transmits the interruption signal 34 (see FIG. 6B) with the address information unit 32 as ADD: FF which is address information indicating broadcast transmission.

  When the integrated unit control unit 3 transmits the interruption signal 34 in S210, the integrated unit control unit 3 obtains the power generation information of the monitoring device 4 having the smallest address information value among the monitoring devices 4 that have not collected the power generation information. Collect (S220). Specifically, the integrated unit control unit 3 transmits the transmission instruction signal 35 (see FIG. 6C) with the address information unit 32 set to ADD: 01 which is the smallest address information.

  When the integrated unit control unit 3 transmits the transmission instruction signal 35 in S220, the monitoring device 4a receives it and transmits the power generation information data 40, and the data logger 2 receives it (S230). When the integrated unit control unit 3 receives the power generation information data 40 in S230, the integrated unit control unit 3 may also confirm whether the power generation information data 40 includes the interruption flag 41 and perform predetermined processing according to the confirmation result. . When the power generation information data 40 is received in S230, the integrated unit control unit 3 confirms whether the power generation information has been collected from all the monitoring devices 4 (S240).

  If the integrated unit control unit 3 determines in S240 that the power generation information of all the monitoring devices 4 has not been collected (No in S240), the integrated unit control unit 3 determines that the address information unit 32 The transmission instruction signal 35 having a value one greater than the address information of the monitoring device 4 that collected the power generation information immediately before is transmitted (S250). For example, when the monitoring device 4 that lastly collected the power generation information is the monitoring device 4a, the integrated unit control unit 3 transmits a transmission instruction signal 35 in which the value of the address information unit 32 is ADD: 02.

  The integrated unit control unit 3 repeats the processes of S220 to S250 until the power generation information is collected from all the monitoring devices 4. Note that the order in which the integrated unit control unit 3 transmits the transmission instruction signal 35 may be different from that described above. For example, the address information is sequentially reduced from the monitoring device 4 having some large address information, and the transmission instruction signal 35 is transmitted. The transmission instruction signal 35 may be transmitted in accordance with a predetermined order of address information.

  When the integrated unit control unit 3 collects the power generation information from all the monitoring devices 4 (Yes in S240), the integrated unit control unit 3 broadcasts again the interruption signal 34 instructing to interrupt the measurement to all the monitoring devices 4 (S210). . Thereafter, the integrated unit controller 3 repeats the processes of S210 to S260 and sequentially collects power generation information.

  As described above, when the monitoring device 4a has a function of receiving the restart signal 36 from the data logger 2 instead of the automatic measurement restarting function and restarting the measurement, the integrated unit control unit 3 of the data logger 2 is used. After collecting the power generation information, a restart signal 36 for notifying the restart of the measurement of the power generation information is transmitted to all the monitoring devices 4. This case will be described with reference to FIG. In FIG. 5, the processes from S200 to S250 are the same as those in FIG.

  When the integrated unit control unit 3 of the data logger 2 collects the power generation information from all the monitoring devices 4 in S240 (Yes in S240), the measurement of the power generation information suspended in all the monitoring devices 4 is resumed. A restart signal 36 for instructing is transmitted. Specifically, the integrated unit control unit 3 sets the value of the address information unit 32 as ADD: FF indicating broadcast transmission, and a restart signal 36 including a restart command command that instructs the information unit 33 to restart measurement (see FIG. 6 (f).) Is transmitted.

  When the integrated unit control unit 3 transmits the restart signal 36 in S260, the integrated unit control unit 3 transmits the interrupt signal 34 again to interrupt the measurement of all the monitoring devices 4 (S210). Thereafter, the data logger 2 repeats the processes of S210 to S260.

  According to the monitoring system 1 of the photovoltaic power generation system having the above-described configuration, the integrated unit control unit 3 of the data logger 2 transmits all the monitoring devices 4 by broadcasting the interruption signal 34 that is a signal for interrupting the measurement of the power generation information. And the measurement of all the monitoring devices 4 is interrupted all at once. For this reason, the power generation information at the same time when the interruption signal 34 is received is stored in each power generation information storage unit 6. For this reason, for example, the data logger 2 and the monitoring device 4 are connected by a line with a low communication speed, or the number of strings 10 is very large, and it takes time to collect the power generation information of all the monitoring devices 4. Even when necessary, since the power generation information measured at the same time will be stored in the power generation information storage unit 6, without being affected by the communication status between the data logger 2 and the monitoring device 4, It is possible to collect power generation information that ensures synchronization. Further, in order to ensure simultaneity, it is not necessary to incorporate a clock or a device having a time stamp function for adding time information such as measurement time to the measured power generation information. The system 1 can have a simple and inexpensive configuration.

  In addition, the measurement control unit 5 of the monitoring device 4 has a measurement automatic restart function that receives the interruption signal 34, interrupts the measurement, and automatically restarts the measurement after transmitting the power generation information to the data logger 2. . For this reason, it is not necessary to perform special processing after the measurement interruption by the interruption signal 34, and the monitoring system 1 by simple control can be configured.

  The integrated unit control unit 3 of the data logger 2 also has a function of transmitting a restart signal 36 instructing all monitoring devices 4 to restart measurement of power generation information that has been interrupted. For this reason, it is possible to reliably restart the measurement of the monitoring device 4 that has interrupted the measurement, and it is possible to collect power generation information more stably.

  The integrated unit control unit 3 of the data logger 2 transmits a transmission instruction signal 35 for transmitting the power generation information stored in the power generation information storage unit 6 after transmitting the interruption signal 34 to the monitoring device 4. have. For this reason, it is possible to reliably collect the power generation information stored in the power generation information storage unit 6 from each monitoring device 4.

  Further, when transmitting the power generation information to the data logger 2, the measurement control unit 5 of the monitoring device 4 adds the interruption flag 41 corresponding to the response to the interruption signal 34 and transmits the power generation information. For this reason, the integrated unit control unit 3 of the data logger 2 confirms whether or not the collected power generation information has the interruption flag 41 so that the collected power generation information is transmitted after correctly receiving the interruption signal 34 transmitted in advance. It can be determined whether the power generation information. That is, when the integrated unit control unit 3 finds power generation information without the interruption flag 41 in the collected power generation information, the monitoring device 4 that transmitted the power generation information has not interrupted the measurement, and the power generation information is not Therefore, it can be determined that the power generation information is different from the time when the other power generation information is collected. Accordingly, the integrated unit control unit 3 can take measures such as discarding the detected power generation information without the interruption flag 41 or collecting power generation information from all the monitoring devices 4 again. Therefore, it is possible to more reliably collect the power generation information secured.

  In addition, by transmitting the power generation information with such an interruption flag 41, transmission of a response signal for notifying the data logger 2 that the monitoring device 4 has correctly received the interruption signal 34 can be omitted. Since the interruption signal 34 is transmitted by broadcast, when all the monitoring devices 4 transmit response signals, the response signals are concentrated on the data logger 2 at a time, causing collisions or the like, resulting in a decrease in communication speed or communication failure. However, such a collision can be prevented by adding the interruption flag 41 and omitting the response signal.

  In addition, since the data logger 2 and the monitoring device 4 can collect power generation information in which synchronization is ensured without being affected by the communication speed between them, it is possible to transmit and receive signals between each other by wireless communication. . For this reason, even when installing the monitoring system 1 of a photovoltaic power generation system retrofitted to an existing photovoltaic power generation system, it is not necessary to install additional wiring, so that the installation can be facilitated.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
In the above-described embodiment, the measurement control unit 5 has been described as applied to an example having a measurement interruption function for interrupting the measurement of power generation information according to the interruption signal 34. However, the measurement control unit 5 performs the measurement according to the interruption signal 34. The power generation information stored in the power generation information storage unit 6 may be interrupted. At this time, each measurement control unit 5 may continue the measurement of the power generation information, or may interrupt the measurement according to the interruption signal 34. In this way, each power generation information storage unit 6 stores the power generation information at the same time at which the interruption signal 34 is received, and the power generation information measurement by the measurement control unit 5 continues. Therefore, it is possible to collect information that ensures simultaneity.

  In this case, the measurement control unit 5 receives the restart signal 36 from the data logger 2 and resumes storing the power generation information in the power generation information storage unit 6 or stored in the power generation information storage unit 6. The power generation information storage unit 6 has a function of automatically restarting storage in the power generation information storage unit 6 after transmitting the generated power generation information to the data logger 2, and at a predetermined timing as in the above embodiment. Resumes memory for. The means and method for the measurement control unit 5 to transmit the power generation information stored in the power generation information storage unit 6 to the data logger 2 are the same as in the above embodiment.

  Further, for example, when the integrated unit control unit 3 of the data logger 2 finds power generation information without the interruption flag 41 in the collected power generation information, the collection of the power generation information from the monitoring device 4 is stopped and the interruption signal 34 again. May be broadcasted. In this way, when at least one monitoring device 4 that has not suspended measurement or generation information storage is detected, the interruption signal 34 is transmitted again to collect generation information again, thereby ensuring simultaneity. It is possible to collect power generation information efficiently. Further, the integrated unit control unit 3 may continuously transmit the interruption signal 34 when the interruption signal 34 is broadcast again. By doing in this way, it becomes possible to interrupt | suspend the measurement of the monitoring apparatus 4 which has not interrupted measurement, and memory | storage of power generation information, and memory | storage of power generation information reliably. Furthermore, the transmission of the continuous interruption signal 34 is performed within a time length that can be tolerated by the control system of the photovoltaic power generation system, etc., so that it is possible to collect power generation information that ensures simultaneity.

  In the above embodiment, the description has been made by applying to an example in which the monitoring device 4 and the data logger 2 are serially connected. However, for example, the monitoring device 4 has a plurality of integrated unit control units 3. A plurality of daisy chains connected serially may be connected to the data logger 2 in parallel. Further, the monitoring device 4 and the data logger 2 may be connected by other connection methods without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Monitoring system 2 of photovoltaic power generation system 2 Data logger 3 Integrated unit control part 4a-4x Monitoring apparatus 5a-5x Measurement control part 6a-6x Electric power generation information storage part 10a-10x String 11 Solar cell 13a-13x Wireless interface 14 Wireless interface 30 Transmission / reception information 31 Header information part 32 Address information part 33 Information part 34 Interruption signal 35 Transmission instruction signal 36 Resume signal 40 Power generation information data 41 Interruption flag

Claims (9)

A solar power generation system monitoring system having a plurality of solar cell strings to which solar cells are connected,
A power generation information measuring unit that measures power generation information that is information related to the output of the predetermined solar cell string;
A power generation information accumulation unit that collects and stores the power generation information measured by the power generation information measurement unit;
The power generation information measurement unit includes:
A power generation information storage unit for storing the measured power generation information;
A measurement unit controller that controls measurement of the power generation information and storage of the power generation information in the power generation information storage unit;
Having at least
The power generation information integration unit has at least an integrated unit control unit that transmits a signal for controlling measurement of the power generation information in the power generation information measurement unit or storage of the power generation information to the power generation information measurement unit,
The integrated unit control unit transmits an interruption signal that is a signal for interrupting the measurement of the generation information or the storage to the generation information storage unit to the plurality of generation information measurement units,
The measurement unit control unit of the power generation information measurement unit that has received the interruption signal interrupts measurement of the power generation information or storage in the power generation information storage unit based on the interruption signal. Power generation system monitoring system. The measurement unit control unit further transmits the power generation information stored in the power generation information storage unit to the power generation information accumulation unit,
The said measurement unit control part restarts the measurement of the said power generation information, or the memory | storage to the said power generation information storage part, after transmitting the said power generation information to the said power generation information integration | stacking unit. Monitoring system for solar power generation system. The measurement unit control unit further transmits the power generation information stored in the power generation information storage unit to the power generation information accumulation unit,
The integrated unit control unit, after receiving the power generation information from the power generation information measurement unit, sends a restart signal for notifying the measurement of the power generation information or the resumption of storage to the power generation information storage unit to the power generation information measurement unit. Send
The measurement unit control unit of the power generation information measurement unit that has received the restart signal restarts measurement of the power generation information or storage in the power generation information storage unit based on the restart signal. The monitoring system of the solar power generation system of 2. The measurement unit control unit further transmits the power generation information stored in the power generation information storage unit to the power generation information accumulation unit,
The integrated unit control unit is a signal for transmitting the power generation information stored in the power generation information storage unit to the power generation information integration unit after transmitting the interruption signal to the plurality of power generation information measurement units. Send further instruction signals,
The measurement unit control unit of the power generation information measurement unit that has received the transmission instruction signal transmits the power generation information to the power generation information accumulation unit based on the transmission instruction signal. Monitoring system for solar power generation system. The measurement unit control unit adds a response signal as a response to the interruption signal to the power generation information transmitted to the power generation information integration unit. The monitoring system of the described photovoltaic power generation system.   Transmission / reception of the signal between the said power generation information measurement unit and the said power generation information integration unit is performed by radio | wireless communication, The solar power generation system of any one of Claims 1-5 characterized by the above-mentioned. Monitoring system. A method for monitoring a photovoltaic system having a plurality of solar cell strings to which solar cells are connected, comprising:
Measuring power generation information related to the output of the solar cell string by a power generation information measurement unit installed in the solar cell string, and storing the measured power generation information in a power generation information storage unit provided in the power generation information measurement unit;
A step of interrupting measurement of the plurality of power generation information by the power generation information measurement unit or storage in the power generation information storage unit based on an interruption signal transmitted from the power generation information accumulation unit that collects and accumulates the power generation information When,
A method for monitoring a photovoltaic power generation system, comprising: A power generation information measurement unit that measures power generation information that is information related to outputs of a plurality of solar cell strings connected to solar cells, and a power generation information integration unit that collects and stores the power generation information measured by the power generation information measurement unit. A program of the power generation information measurement unit in a solar power generation system having:
In electronic computing equipment,
Power generation information measurement function for measuring power generation information that is information related to the output of the predetermined solar cell string;
A power generation information storage function for storing the measured power generation information in a power generation information storage unit;
An interrupt function for interrupting the measurement of the power generation information based on the interrupt signal received from the power generation information integration unit, or the storage in the power generation information storage unit,
Program to realize. Measuring power generation information, which is information related to outputs of a plurality of solar cell strings connected to solar cells, and storing the power generation information measurement unit stored in the power generation information storage unit, and the power generation information measured by the power generation information measurement unit A program for the power generation information integration unit in a photovoltaic power generation system having a power generation information integration unit for storing the data,
In electronic computing equipment,
The program for implement | achieving the interruption function which transmits the interruption signal which interrupts the measurement of the said electric power generation information, or the memory | storage to the said electric power generation information storage part with respect to the said several electric power generation information measurement unit.

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