WO2016170638A1 - Power generation system, time synchronization method, power conversion device, and synchronization control device - Google Patents

Power generation system, time synchronization method, power conversion device, and synchronization control device Download PDF

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Publication number
WO2016170638A1
WO2016170638A1 PCT/JP2015/062361 JP2015062361W WO2016170638A1 WO 2016170638 A1 WO2016170638 A1 WO 2016170638A1 JP 2015062361 W JP2015062361 W JP 2015062361W WO 2016170638 A1 WO2016170638 A1 WO 2016170638A1
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WO
WIPO (PCT)
Prior art keywords
time
power conversion
unit
power
time information
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PCT/JP2015/062361
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French (fr)
Japanese (ja)
Inventor
松本　賢一郎
真吾 柳本
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株式会社東芝
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Priority to PCT/JP2015/062361 priority Critical patent/WO2016170638A1/en
Publication of WO2016170638A1 publication Critical patent/WO2016170638A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]

Definitions

  • Embodiments of the present invention relate to a power generation system, a time synchronization method, a power conversion device, and a synchronization control device.
  • a power conversion device that converts DC power to AC power that operates in synchronization with time in order to control output power.
  • the power conversion device receives time information from an intermediary device that communicates with the power conversion device, and performs time synchronization.
  • the intermediary device periodically receives time information transmitted by an NTP (Network Time Protocol) server (time correction server) via a network such as the Internet, and corrects the internal time.
  • NTP Network Time Protocol
  • time correction server time correction server
  • the internal time is corrected depending on the connection state between the mediation device and the network, and therefore, the accuracy of synchronization of the internal time with respect to the time information may not be sufficient.
  • the problem to be solved by the present invention is to provide a power generation system, a time synchronization method, a power conversion device, and a synchronization control device that can increase the accuracy of synchronization with respect to time.
  • the power generation system of the embodiment has a plurality of power conversion devices and a control device.
  • the plurality of power conversion devices are provided corresponding to the plurality of solar cell modules, and convert DC power supplied from the solar cell modules into AC power.
  • the control device can communicate with the plurality of power conversion devices and controls the plurality of power conversion devices.
  • At least one power conversion device among the plurality of power conversion devices includes a time acquisition unit and a transmission unit.
  • the time acquisition unit acquires time information without depending on the control device and the other power conversion device.
  • the transmission unit transmits the time information acquired by the time acquisition unit to the control device.
  • the control device includes a receiving unit, a clock function unit, and a control unit.
  • the reception unit receives time information transmitted by the transmission unit of the power conversion device.
  • the clock function unit measures time.
  • the control unit is a control unit that controls the plurality of power conversion devices based on the time counted by the clock function unit, and sets the time of the clock function unit based on the time
  • FIG. 1 is a block diagram illustrating a configuration of a solar power generation system 1 according to the first embodiment.
  • the photovoltaic power generation system 1 according to the first embodiment includes a plurality of solar cell modules 10-1,..., 10-N, a plurality of power conversion devices 20-1,. Device 30.
  • a commercial power system 40 is connected to the solar cell module 10 and the power conversion device 20 in the solar power generation system 1.
  • the solar cell module is not described separately from other solar cell modules, the reference signs after the hyphen are omitted and described as “solar cell module 10”.
  • symbol after a hyphen is abbreviate
  • the solar power generation system 1 connects a plurality of solar cell modules 10 and the commercial power system 40 via the power conversion device 20.
  • the power converter 20 converts the DC power generated by the solar cell module 10 into AC power and supplies it to the power line 1a.
  • the commercial power system 40 supplies AC system power to the power line 1a.
  • the solar power generation system 1 links the plurality of solar cell modules 10 and the commercial power system 40 to supply AC power to a load (not shown).
  • the solar cell module 10 is one of a plurality of solar cell modules 10 installed on a roof 100a of a house having a good radio wave environment.
  • the solar cell module 10 converts the light energy of the received light into electric energy, and supplies the converted electric energy to the power conversion device 20 as DC power.
  • one power conversion device 20 is attached to each solar cell module 10.
  • the power converter 20 is installed on the roof 100a of the house together with the solar cell module 10.
  • the power converter 20 is supplied with DC power generated by each solar cell module 10.
  • the one power converter device 20 is provided with respect to each solar cell module 10, it is not restricted to this, Even if the one power converter device 20 is provided with respect to the several solar cell module 10.
  • FIG. 2 is a configuration diagram of the power conversion device 20 in the solar power generation system 1 of the first embodiment.
  • the power conversion device 20 includes a power conversion circuit 202, a drive control unit 204, a wireless communication unit 206, and a time acquisition unit 208.
  • 2 includes the time acquisition unit 208, but at least one of the plurality of power conversion devices 20 in the solar power generation system 1 has the time acquisition unit 208. It only has to have.
  • the power conversion circuit 202 is an inverter bridge including a plurality of switching elements.
  • the power conversion circuit 202 is attached between the solar cell module 10 and the load 50.
  • a plurality of switching elements are on / off controlled in accordance with a control signal output from the drive control unit 204.
  • the power conversion circuit 202 converts the DC power input from the solar cell module 10 into AC power.
  • the AC power converted by the power conversion circuit 202 is supplied to the load 50.
  • the load 50 is a device that consumes AC power supplied from the power conversion device 20 or the commercial power system 40.
  • the load 50 is, for example, a home appliance in a house.
  • the drive control unit 204 controls the AC power output from the power conversion circuit 202 by controlling the on / off operation of the switching element of the power conversion circuit 202.
  • a target power command value is supplied from the wireless communication unit 206 to the drive control unit 204.
  • the drive control unit 204 controls the AC power output by the power conversion circuit 202 so as to approach the target power command value input from the wireless communication unit 206.
  • the wireless communication unit 206 is a wireless communication module that includes the antenna unit 206a and performs wireless communication with the gateway device 30.
  • the wireless communication unit 206 performs communication processing according to a predetermined protocol, and transmits / receives a wireless signal to / from the gateway device 30 using a predetermined carrier frequency.
  • the wireless communication unit 206 uses, for example, a carrier frequency in the 920 MHz band of low power wireless.
  • the communication method of the wireless communication unit 206 is not limited to the 920 MHz band wireless communication method, and may be another communication method.
  • Other communication methods include, for example, a power line communication (PLC (Power Line Communication) method, a 2.5 GHz band wireless communication method, etc.)
  • PLC Power Line Communication
  • the wireless communication unit 206 transmits a target power command transmitted by the gateway device 30.
  • the target power command value is output to the drive control unit 204.
  • the wireless communication unit 206 is a current sensor (not shown) installed between the power conversion circuit 202 and the load 50. The output current detected by is acquired and transmitted to the gateway device 30.
  • the time acquisition unit 208 acquires time information without depending on the gateway device 30 and other power conversion devices 20.
  • Acquiring time information without depending on the gateway device 30 and other power conversion devices 20 includes acquiring time information from an external device other than the gateway device 30 and the power conversion device 20.
  • the external device is a transmitting station that transmits a standard radio wave.
  • the time acquisition unit 208 includes an antenna unit 208a, a radio wave reception unit 208b, and a control circuit (not shown) such as an IC (Integrated Circuit).
  • the time acquisition unit 208 acquires time information by the radio wave reception unit 208b by receiving the standard radio wave received from a transmitting station (not shown) that transmits the standard radio wave by the antenna unit 208a.
  • the radio wave receiver 208b periodically generates a standard radio wave signal, for example, according to control of the control circuit.
  • the antenna unit 208a is preferably formed at a position where the standard radio wave can be received with high intensity.
  • the antenna part 208a is formed in the vicinity of the roof 100a of a house, for example.
  • the control circuit of the time acquisition unit 208 instructs the wireless communication unit 206 to transmit the generated standard radio signal to the gateway device 30 as time information.
  • the time acquisition unit 208 functions as a time acquisition unit that acquires time information.
  • the wireless communication unit 206 functions as a transmission unit that transmits time information acquired by the time acquisition unit.
  • FIG. 3 is a block diagram illustrating a configuration of the gateway device 30 in the solar power generation system 1 according to the first embodiment.
  • the gateway device 30 is provided, for example, near a distribution board such as a space 100b in a house or outdoors.
  • the gateway device 30 is a control device that can communicate with the wireless communication units 206 of the plurality of power conversion devices 20 and controls the power conversion devices 20.
  • the gateway device 30 includes a central control unit 302, a wireless communication unit 304, a home communication unit 306, a clock function unit 308, a schedule storage unit 310, and a display unit 312.
  • the home communication unit 306 is connected to an external network such as the Internet via a home network such as a LAN (Local Area Network).
  • the in-home communication unit 306 receives information for controlling the output power of the power conversion device 20 according to the control of the central control unit 302, and outputs information for controlling the output power of the power conversion device 20 to the central control unit 302. To do.
  • the wireless communication unit 304 is a wireless communication module that includes the antenna unit 304a and performs wireless communication with the plurality of power conversion devices 20.
  • the wireless communication unit 304 performs communication processing according to the same protocol as the wireless communication unit 206 of the power conversion device 20, and transmits and receives wireless signals to and from the wireless communication unit 206 using a predetermined carrier frequency.
  • the wireless communication unit 304 uses, for example, a carrier frequency in the 920 MHz band of low power wireless. Note that the communication method of the wireless communication unit 304 may be any method that allows communication with the wireless communication unit 206.
  • the wireless communication unit 304 functions as a reception unit that receives the standard radio wave signal transmitted by the wireless communication unit 206 as time information.
  • the wireless communication unit 304 outputs the received time information to the central control unit 302.
  • the schedule storage unit 310 is realized by an HDD (Hard Disc Drive), flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), ROM (Read Only Memory), RAM (Random Access Memory), or the like.
  • the schedule storage unit 310 stores information for controlling the output power of the power conversion device 20 received by the home communication unit 306 and input from the central control unit 302.
  • Information for controlling the output power of the power converter 20 is generated by, for example, an electric power company that operates the commercial power system 40.
  • the information for controlling the output power of the power conversion device 20 includes, for example, identification information for identifying the power conversion device 20, time information for controlling the power conversion device 20, and an output for the maximum output power of the power conversion device 20.
  • Output suppression information indicating the power ratio [%] is associated.
  • information in which identification information, time information, and output suppression information of each power conversion device 20 are associated is referred to as “schedule information”.
  • the schedule information received by the home communication unit 306 by the central control unit 302 may be stored in the schedule storage unit 310.
  • the schedule storage unit 310 may store schedule information stored in an external storage medium such as a USB (Universal Serial Bus) memory.
  • the external storage medium is connected to the gateway device 30 by a maintenance company, for example, and the stored schedule information is read out.
  • the clock function unit 308 measures time. The time measured by the clock function unit 308 is referred to by the central control unit 302. The clock function unit 308 corrects the time information measured by itself to the time information output from the central control unit 302.
  • the display unit 312 is a display device that presents various information to the residents of the house.
  • the display content of the display unit 312 is controlled by the central control unit 302.
  • the display unit 312 displays information such as the power generation state of the solar cell module 10 or the output power suppression state of the power converter 20.
  • the central control unit 302 may be a software function unit that functions when a processor such as a CPU (Central Processing Unit) as an arithmetic circuit and a control circuit executes a program stored in a memory, or an LSI (Large A hardware function unit such as Scale (Integration) or ASIC (Application Specific Specific Integrated Circuit) may be used.
  • the central control unit 302 corrects the time counted by the clock function unit 308 based on the time information input from the power conversion device 20 (having the time acquisition unit 208) via the wireless communication unit 304. As a result, the central control unit 302 synchronizes the time information based on the standard radio wave and the time information measured by the clock function unit 308.
  • the central control unit 302 has reached the control timing for suppressing the output power of the power conversion device 20 by comparing the current time measured by the clock function unit 308 with the time stored in the schedule information. It is determined whether or not.
  • the central control unit 302 controls a target power command value that suppresses the output of the power conversion device 20 based on the output suppression information in the schedule information when the control timing for suppressing the output power of the power conversion device 20 arrives. Generate as a signal.
  • the central control unit 302 transmits the generated control signal from the wireless communication unit 304 to the power conversion device 20 based on the identification information in the schedule information. Accordingly, the central control unit 302 controls the output power by the power conversion device 20. Further, the central control unit 302 monitors the output power of the power conversion device 20 based on the output current of the power conversion device 20 input from the wireless communication unit 304.
  • the power conversion device 20 acquires time information without depending on the gateway device 30 and the other power conversion devices 20, and the acquisition is performed.
  • the time information is synchronized with the time information to be timed in the gateway device 30.
  • the gateway device when synchronizing the time measured in the gateway device 30 with the time information transmitted by the NTP server in the external network, the gateway device depends on the connection state between the home communication unit 306 and the external network. There is a possibility that the synchronization accuracy of the time counted at 30 may be lowered.
  • the gateway device 30 When the standard radio waves are received by the gateway device 30, the gateway device 30 is installed in the space 100 b in the house, so that the time measured by the gateway device 30 is synchronized depending on the radio wave reception sensitivity. Accuracy may be reduced.
  • the gateway device 30 may not be able to communicate with an external network, and the time measured by the gateway device 30 may not be corrected.
  • the time measured in the gateway device 30 is highly accurate to the time based on the standard radio wave without depending on the installation environment of the gateway device 30. Can be synchronized.
  • the solar power generation system 1 of 1st Embodiment a freedom degree can be given to the installation position of the gateway apparatus 30.
  • FIG. Furthermore, according to the photovoltaic power generation system 1 of the first embodiment, maintenance work for managing the time counted by the gateway device 30 can be simplified.
  • the photovoltaic power generation system 1 of the first embodiment since the output power of the power conversion device 20 is controlled based on the time counted in the gateway device 30, the power is highly accurate with respect to the time. The output power of the converter 20 can be controlled. As a result, according to the photovoltaic power generation system 1 of the first embodiment, the reliability of the power conversion device 20 with respect to an electric power company that requests to suppress the output power of the power conversion device 20 can be increased.
  • the radio wave reception unit 208b in the time acquisition unit 208 has a configuration of a wireless communication module that performs communication via a cellular network or a wireless LAN, instead of the configuration of receiving standard radio waves. May be.
  • the radio wave reception unit 208b establishes communication with a time correction server (not shown) via a cellular network or a wireless LAN, and receives time information transmitted from the time correction server as wireless data.
  • the time acquisition unit 208 causes the wireless communication unit 206 to transmit the acquired time information to the gateway device 30.
  • the central control unit 302 corrects the time counted by the clock function unit 308 based on the time information output by the wireless communication unit 304.
  • the central control unit 302 synchronizes the time information transmitted from the time correction server with the time information measured by the clock function unit 308.
  • the time inside the gateway device 30 can be synchronized without depending on the installation environment of the gateway device 30. The accuracy of synchronization with respect to the time measured by the device 30 can be increased.
  • FIG. 4 is a block diagram showing another configuration of the solar power generation system 1 according to the first embodiment.
  • This solar power generation system 1 includes the time acquisition unit 208 in at least some of the plurality of power conversion devices 20-1,... This is different from the solar power generation system 1 of the embodiment.
  • the power conversion device 20-1 and the power conversion device 20-N are provided with a time acquisition unit 208-1 and a time acquisition unit 208-N.
  • the time acquisition unit will be referred to as a time acquisition unit 208 when it is not described separately from other time acquisition units.
  • the plurality of time acquisition units 208 have the same function as the time acquisition unit 208 described above.
  • the plurality of time acquisition units 208 acquire time information and cause the wireless communication unit 206 to transmit the acquired time information to the gateway device 30.
  • the gateway device 30 receives time information transmitted by the plurality of power conversion devices 20.
  • the central control unit 302 compares a plurality of time information respectively received by the wireless communication unit 304.
  • the central control unit 302 compares the plurality of pieces of time information to determine whether the plurality of pieces of time information are within the same time or a predetermined error range.
  • the central control unit 302 corrects the time counted by the clock function unit 308 based on the time information output from the wireless communication unit 304 when a plurality of time information is within the same time or a predetermined error range. To do.
  • the central control unit 302 corrects the time counted by the clock function unit 308 because the plurality of time information is not consistent when the plurality of time information is not within the same time or a predetermined error range. Not implemented.
  • the time counted in the clock function unit 308 is corrected based on the comparison result of the plurality of time information respectively acquired by the plurality of time acquisition units 208. Therefore, the accuracy of synchronization with respect to the time counted in the gateway device 30 can be further increased. Further, according to the photovoltaic power generation system 1 of the first embodiment, even when the reception sensitivity of radio waves differs depending on the installation locations of the plurality of time acquisition units 208, a plurality of pieces of time information are consistent. The time measured by the clock function unit 308 is corrected, and when the time information is not consistent, the time measured by the clock function unit 308 is not corrected. The reliability of can be increased.
  • FIG. 5 is a block diagram illustrating another configuration of the photovoltaic power generation system 1 according to the second embodiment.
  • This solar power generation system 1 includes power conversion devices 20-1,..., And 20-N, a clock function unit 210-1,..., And 210-N, a correction unit 212-1,. 212-N is different from the solar power generation system 1 of the first embodiment described above. Further, the solar power generation system 1 differs from the solar power generation system 1 of the first embodiment described above in that it includes a power conversion device 20-N that does not have a time acquisition unit.
  • the clock function unit is referred to as a clock function unit 210 when it is not described separately from other clock function units.
  • the correction unit is referred to as a correction unit 212.
  • FIG. 6 is a configuration diagram of the power conversion device 20-1 in the solar power generation system 1 of the second embodiment.
  • the power conversion device 20-1 is different in that it includes the power conversion device 20, the clock function unit 210-1, and the correction unit 212-2 in the first embodiment.
  • the clock function unit 210-1 receives the time information acquired by the time acquisition unit 208 and measures the time.
  • the clock function unit 210 is connected to the drive control unit 204 in the power conversion device 20 described above, and the time that is being measured is referred to by the drive control unit 204.
  • the clock function unit 210 counts the time without depending on the gateway device 30 and the other power conversion devices 20.
  • the correction unit 212 is supplied with time information transmitted from the gateway device 30 and received by the wireless communication unit 206.
  • the correction unit 212 corrects the time measured by the clock function unit 210 to the time information based on the time measured by the gateway device 30. Thereby, the clock function unit 210 synchronizes with time information based on the time counted in the gateway device 30.
  • the drive control unit 204 controls the power conversion circuit 202 based on the time counted by the clock function unit 210.
  • FIG. 7 is a configuration diagram of the power conversion device 20-N in the solar power generation system 1 of the second embodiment.
  • the power conversion device 20-N is different from the power conversion device 20-1 illustrated in FIG. 6 in that the time acquisition unit 208 is not provided.
  • the clock function unit 210-N measures the time.
  • the clock function unit 210 is connected to the drive control unit 204, and the time measured is referred to by the drive control unit 204.
  • the clock function unit 210 counts the time without depending on the gateway device 30 and the other power conversion devices 20.
  • the correction unit 212 is supplied with time information transmitted from the gateway device 30 and received by the wireless communication unit 206.
  • the correction unit 212 corrects the time measured by the clock function unit 210 to the time information based on the time measured by the gateway device 30.
  • the drive control unit 204 controls the power conversion circuit 202 based on the time counted by the clock function unit 210.
  • FIG. 8 is a sequence diagram showing a flow of processing executed in the solar power generation system 1 of the second embodiment.
  • the gateway device 30 transmits the time information measured by the clock function unit 308 to the power conversion device 20, and the correction unit 212 synchronizes the time of the clock function unit 210.
  • the control for simultaneously stopping the operations of the power conversion device 20-1 and the power conversion device 20-N among the plurality of power conversion devices 20 at time T will be described.
  • the gateway device 30 extracts from the schedule information the operation time T at which the power conversion devices 20-1 and 20-N are stopped simultaneously.
  • the gateway device 30 determines whether or not it is time to execute control for simultaneously stopping the power conversion devices 20-1 and 20-N.
  • the gateway device 30 sets the operation time T to the power conversion devices 20-1 and 20-N in response to determining that the timing for performing the control for simultaneously stopping the power conversion devices 20-1 and 20-N has arrived.
  • the operation time information shown is transmitted.
  • the gateway device 30 transmits operation time information (stop (T)) for stopping the operation to t seconds before the operation time to the power conversion device 20-1. Further, the gateway device 30 transmits operation time information (stop (T)) for stopping the power operation to t- ⁇ seconds before the operation time to the power conversion device 20-N.
  • the power conversion device 20-1 and the power conversion device 20-N recognize the operation time T indicated by the operation time information by receiving the operation time information. Thereafter, the power conversion devices 20-1 and 20-N stop the operation when the time measured by the clock function units 210-1 and 210-N reaches the operation time T indicated by the operation time information. .
  • the operation time information is transmitted from the gateway device 30 to the plurality of power conversion devices 20, and it is determined by each power conversion device 20 that the operation time has arrived.
  • the operation of the conversion device 20 can be controlled.
  • since the accuracy of the operation timing of each power conversion device 20 can be further increased, it is required to suppress the output power of the power conversion device 20.
  • the reliability of the power conversion device 20 with respect to the electric power company that performs can be further increased.
  • the correction unit 212 is based on the time information acquired by the time acquisition unit 208 instead of correcting the time measured by the clock function unit 210 based on the time measured by the gateway device 30 described above.
  • the time measured by the clock function unit 210 may be corrected.
  • FIG. 9 is a diagram illustrating a modification of the photovoltaic power generation system 1 according to the embodiment.
  • the solar power generation system 1 of the above-described embodiment includes a plurality of power conversion devices 20, but the function of the gateway device 30 described above is mounted on a power conditioner device 30A connected to the plurality of solar cell modules 10. May be.
  • the power conditioner device 30A converts DC power generated by the plurality of solar cell modules 10 into AC power and supplies the AC power to the load.
  • the photovoltaic power generation system 1 of the modified example installs the time acquisition unit 208 in the vicinity of at least one solar cell module 10 among the plurality of solar cell modules 10.
  • the time information acquired by the time acquisition unit 208 is transmitted as a radio signal to the power conditioner device 30A.
  • the power conditioner device 30 ⁇ / b> A corrects the time counted by the own device based on the time information.
  • the time at which at least one power conversion device 20 of the plurality of power conversion devices 20 acquires time information without depending on the gateway device 30 and the other power conversion devices 20 since it has the acquisition part 208 and the gateway apparatus 30 has the centralized control part 302 which correct

Abstract

A solar power generation system according to an embodiment has multiple power conversion devices and a control device, with at least one of the multiple power conversion devices equipped with a time acquisition unit for acquiring time information independently from the control device and the other power conversion devices, and a transmission unit for transmitting the acquired time information to the control device. The control device is equipped with: a reception unit for receiving the time information transmitted by the transmission unit of the power conversion device; a clock function unit for clocking the time; and a control unit for controlling the multiple power conversion devices on the basis of the time as clocked by the clock function unit, and correcting the time in the clock function unit on the basis of the time information received by the reception unit.

Description

発電システム、時刻同期方法、電力変換装置、および同期制御装置Power generation system, time synchronization method, power conversion device, and synchronization control device
　本発明の実施形態は、発電システム、時刻同期方法、電力変換装置、および同期制御装置に関する。 Embodiments of the present invention relate to a power generation system, a time synchronization method, a power conversion device, and a synchronization control device.
　従来、直流電力を交流電力に変換する電力変換装置において、出力電力を制御するために時刻に同期して動作するものが知られている。この電力変換装置は、例えば、電力変換装置と通信する仲介装置から時刻情報を受信して時刻同期を行っていた。仲介装置は、インターネット等のネットワークを介してＮＴＰ（Network　Time　Protocol）サーバー（時刻補正サーバー）により送信された時刻情報を定期的に受信して、内部の時刻を補正していた。しかしながら、従来の技術では、仲介装置とネットワークとの接続状態に依存して内部の時刻を補正しているため、時刻情報に対する内部の時刻の同期精度が十分ではない場合があった。 2. Description of the Related Art Conventionally, a power conversion device that converts DC power to AC power is known that operates in synchronization with time in order to control output power. For example, the power conversion device receives time information from an intermediary device that communicates with the power conversion device, and performs time synchronization. The intermediary device periodically receives time information transmitted by an NTP (Network Time Protocol) server (time correction server) via a network such as the Internet, and corrects the internal time. However, in the conventional technique, the internal time is corrected depending on the connection state between the mediation device and the network, and therefore, the accuracy of synchronization of the internal time with respect to the time information may not be sufficient.
特表２０１２－５３３９７４号公報Special table 2012-533974 gazette
　本発明が解決しようとする課題は、時刻に対する同期の精度を高くすることができる発電システム、時刻同期方法、電力変換装置、および同期制御装置を提供することである。 The problem to be solved by the present invention is to provide a power generation system, a time synchronization method, a power conversion device, and a synchronization control device that can increase the accuracy of synchronization with respect to time.
　実施形態の発電システムは、複数の電力変換装置と、制御装置とを持つ。複数の電力変換装置は、複数の太陽電池モジュールに対応して設けられ、前記太陽電池モジュールから供給された直流電力を交流電力に変換する。制御装置は、前記複数の電力変換装置と通信可能であり、前記複数の電力変換装置を制御する。前記複数の電力変換装置のうち少なくとも一つの電力変換装置は、時刻取得部と、送信部とを持つ。時刻取得部は、前記制御装置および前記他の電力変換装置に依存せずに時刻情報を取得する。送信部は、前記時刻取得部により取得された時刻情報を前記制御装置に送信する。前記制御装置は、受信部と、時計機能部と、制御部とを持つ。受信部は、前記電力変換装置の送信部により送信された時刻情報を受信する。時計機能部は、時刻を計時する。制御部は、前記時計機能部によって計時される時刻に基づいて前記複数の電力変換装置を制御する制御部であって、前記受信部により受信された時刻情報に基づいて前記時計機能部の時刻を補正する。 The power generation system of the embodiment has a plurality of power conversion devices and a control device. The plurality of power conversion devices are provided corresponding to the plurality of solar cell modules, and convert DC power supplied from the solar cell modules into AC power. The control device can communicate with the plurality of power conversion devices and controls the plurality of power conversion devices. At least one power conversion device among the plurality of power conversion devices includes a time acquisition unit and a transmission unit. The time acquisition unit acquires time information without depending on the control device and the other power conversion device. The transmission unit transmits the time information acquired by the time acquisition unit to the control device. The control device includes a receiving unit, a clock function unit, and a control unit. The reception unit receives time information transmitted by the transmission unit of the power conversion device. The clock function unit measures time. The control unit is a control unit that controls the plurality of power conversion devices based on the time counted by the clock function unit, and sets the time of the clock function unit based on the time information received by the reception unit. to correct.
第１の実施形態の太陽光発電システム１の構成を示すブロック図。The block diagram which shows the structure of the solar energy power generation system 1 of 1st Embodiment. 第１の実施形態の太陽光発電システム１における電力変換装置２０の構成図。The lineblock diagram of power converter 20 in photovoltaic power generation system 1 of a 1st embodiment. 第１の実施形態の太陽光発電システム１におけるゲートウェイ装置３０の構成を示すブロック図。The block diagram which shows the structure of the gateway apparatus 30 in the solar energy power generation system 1 of 1st Embodiment. 第１の実施形態の太陽光発電システム１の他の構成を示すブロック図。The block diagram which shows the other structure of the solar energy power generation system 1 of 1st Embodiment. 第２の実施形態の太陽光発電システム１の他の構成を示すブロック図。The block diagram which shows the other structure of the solar energy power generation system 1 of 2nd Embodiment. 第２の実施形態の太陽光発電システム１における電力変換装置２０－１の構成図。The block diagram of the power converter device 20-1 in the solar energy power generation system 1 of 2nd Embodiment. 第２の実施形態の太陽光発電システム１における電力変換装置２０－Ｎの構成図。The block diagram of power converter 20-N in the photovoltaic power generation system 1 of 2nd Embodiment. 第２の実施形態の太陽光発電システム１において実行される処理の流れを示すシーケンス図。The sequence diagram which shows the flow of the process performed in the solar energy power generation system 1 of 2nd Embodiment. 実施形態の太陽光発電システム１の変形例を示す図。The figure which shows the modification of the solar energy power generation system 1 of embodiment.
　以下、実施形態の発電システム、時刻同期方法、電力変換装置、および同期制御装置を、図面を参照して説明する。 Hereinafter, a power generation system, a time synchronization method, a power conversion device, and a synchronization control device according to embodiments will be described with reference to the drawings.
　（第１の実施形態）
　図１は、第１の実施形態の太陽光発電システム１の構成を示すブロック図である。第１の実施形態の太陽光発電システム１は、複数の太陽電池モジュール１０－１、・・・および１０－Ｎと、複数の電力変換装置２０－１、・・・および２０－Ｎと、ゲートウェイ装置３０と、を備える。太陽光発電システム１における太陽電池モジュール１０および電力変換装置２０には、商用電力系統４０が接続される。なお、以下の説明において、太陽電池モジュールを他の太陽電池モジュールと区別して説明しない場合には、ハイフン以降の符号を省略し、「太陽電池モジュール１０」と記載する。また、電力変換装置を他の電力変換装置と区別して説明しない場合には、ハイフン以降の符号を省略し、「電力変換装置２０」と記載する。 (First embodiment)
FIG. 1 is a block diagram illustrating a configuration of a solar power generation system 1 according to the first embodiment. The photovoltaic power generation system 1 according to the first embodiment includes a plurality of solar cell modules 10-1,..., 10-N, a plurality of power conversion devices 20-1,. Device 30. A commercial power system 40 is connected to the solar cell module 10 and the power conversion device 20 in the solar power generation system 1. In the following description, when the solar cell module is not described separately from other solar cell modules, the reference signs after the hyphen are omitted and described as “solar cell module 10”. Moreover, when not distinguishing and explaining a power converter device from another power converter device, the code | symbol after a hyphen is abbreviate | omitted and it describes as "the power converter device 20."
　太陽光発電システム１は、電力変換装置２０を介して複数の太陽電池モジュール１０と商用電力系統４０とを接続させる。電力変換装置２０は、太陽電池モジュール１０により生成された直流電力を交流電力に変換して電力線１ａに供給する。一方、商用電力系統４０は、交流の系統電力を電力線１ａに供給する。これにより、太陽光発電システム１は、複数の太陽電池モジュール１０と商用電力系統４０と連系させて、負荷（不図示）に交流電力を供給する。 The solar power generation system 1 connects a plurality of solar cell modules 10 and the commercial power system 40 via the power conversion device 20. The power converter 20 converts the DC power generated by the solar cell module 10 into AC power and supplies it to the power line 1a. On the other hand, the commercial power system 40 supplies AC system power to the power line 1a. As a result, the solar power generation system 1 links the plurality of solar cell modules 10 and the commercial power system 40 to supply AC power to a load (not shown).
　太陽電池モジュール１０は、電波環境が良好な住宅の屋根１００ａに設置された複数の太陽電池モジュール１０のうちの一枚である。太陽電池モジュール１０は、受光した光の光エネルギーを電気エネルギーに変換し、変換した電気エネルギーを直流電力として電力変換装置２０に供給する。 The solar cell module 10 is one of a plurality of solar cell modules 10 installed on a roof 100a of a house having a good radio wave environment. The solar cell module 10 converts the light energy of the received light into electric energy, and supplies the converted electric energy to the power conversion device 20 as DC power.
　電力変換装置２０は、例えば、各太陽電池モジュール１０に対して一つ取り付けられる。電力変換装置２０は、太陽電池モジュール１０と共に住宅の屋根１００ａに設置される。電力変換装置２０は、各太陽電池モジュール１０により発電された直流電力が供給される。なお、電力変換装置２０は、各太陽電池モジュール１０に対して一つ備えられているが、これに限らず、複数の太陽電池モジュール１０に対して一つの電力変換装置２０が備えられていてもよいし、一つの太陽電池モジュール１０に対して複数の電力変換装置２０が備えられていてもよい。 For example, one power conversion device 20 is attached to each solar cell module 10. The power converter 20 is installed on the roof 100a of the house together with the solar cell module 10. The power converter 20 is supplied with DC power generated by each solar cell module 10. In addition, although the one power converter device 20 is provided with respect to each solar cell module 10, it is not restricted to this, Even if the one power converter device 20 is provided with respect to the several solar cell module 10. FIG. Alternatively, a plurality of power conversion devices 20 may be provided for one solar cell module 10.
　図２は、第１の実施形態の太陽光発電システム１における電力変換装置２０の構成図である。電力変換装置２０は、電力変換回路２０２と、駆動制御部２０４と、無線通信部２０６と、時刻取得部２０８とを備える。なお、図２に示した電力変換装置２０は、時刻取得部２０８を備えているが、太陽光発電システム１における複数の電力変換装置２０のうち少なくとも一つの電力変換装置２０が時刻取得部２０８を備えていればよい。 FIG. 2 is a configuration diagram of the power conversion device 20 in the solar power generation system 1 of the first embodiment. The power conversion device 20 includes a power conversion circuit 202, a drive control unit 204, a wireless communication unit 206, and a time acquisition unit 208. 2 includes the time acquisition unit 208, but at least one of the plurality of power conversion devices 20 in the solar power generation system 1 has the time acquisition unit 208. It only has to have.
　電力変換回路２０２は、複数のスイッチング素子を備えるインバータブリッジである。電力変換回路２０２は、太陽電池モジュール１０と負荷５０との間に取り付けられる。電力変換回路２０２は、駆動制御部２０４により出力された制御信号に従って複数のスイッチング素子がオンオフ制御される。これにより、電力変換回路２０２は、太陽電池モジュール１０から入力された直流電力を交流電力に変換する。電力変換回路２０２により変換された交流電力は、負荷５０に供給される。負荷５０は、電力変換装置２０または商用電力系統４０から供給された交流電力を消費する機器である。負荷５０は、例えば住宅における家電機器である。 The power conversion circuit 202 is an inverter bridge including a plurality of switching elements. The power conversion circuit 202 is attached between the solar cell module 10 and the load 50. In the power conversion circuit 202, a plurality of switching elements are on / off controlled in accordance with a control signal output from the drive control unit 204. Thereby, the power conversion circuit 202 converts the DC power input from the solar cell module 10 into AC power. The AC power converted by the power conversion circuit 202 is supplied to the load 50. The load 50 is a device that consumes AC power supplied from the power conversion device 20 or the commercial power system 40. The load 50 is, for example, a home appliance in a house.
　駆動制御部２０４は、電力変換回路２０２のスイッチング素子のオンオフ動作を制御することで、電力変換回路２０２により出力される交流電力を制御する。駆動制御部２０４には、無線通信部２０６から目標電力指令値が供給される。駆動制御部２０４は、無線通信部２０６から入力された目標電力指令値に近づくように電力変換回路２０２により出力される交流電力を制御する。 The drive control unit 204 controls the AC power output from the power conversion circuit 202 by controlling the on / off operation of the switching element of the power conversion circuit 202. A target power command value is supplied from the wireless communication unit 206 to the drive control unit 204. The drive control unit 204 controls the AC power output by the power conversion circuit 202 so as to approach the target power command value input from the wireless communication unit 206.
　無線通信部２０６は、アンテナ部２０６ａを備え、ゲートウェイ装置３０との間で無線通信を行う無線通信モジュールである。無線通信部２０６は、所定のプロトコルに従って通信処理を行い、所定の搬送周波数を利用してゲートウェイ装置３０との間で無線信号を送受信する。無線通信部２０６は、例えば小電力無線の９２０ＭＨｚ帯の搬送周波数を利用する。なお、無線通信部２０６の通信方式は、９２０ＭＨｚ帯の無線通信方式に限らず、他の通信方式であってもよい。他の通信方式は、例えば、電力線搬送通信（ＰＬＣ（Power　Line　Communication）方式や、２．５ＧＨｚ帯の無線通信方式などが挙げられる。無線通信部２０６は、ゲートウェイ装置３０により送信された目標電力指令値を受信したことに応じて、駆動制御部２０４に目標電力指令値を出力する。また、無線通信部２０６は、電力変換回路２０２と負荷５０との間に設置された電流センサ（不図示）により検出された出力電流を取得し、ゲートウェイ装置３０に送信する。 The wireless communication unit 206 is a wireless communication module that includes the antenna unit 206a and performs wireless communication with the gateway device 30. The wireless communication unit 206 performs communication processing according to a predetermined protocol, and transmits / receives a wireless signal to / from the gateway device 30 using a predetermined carrier frequency. The wireless communication unit 206 uses, for example, a carrier frequency in the 920 MHz band of low power wireless. Note that the communication method of the wireless communication unit 206 is not limited to the 920 MHz band wireless communication method, and may be another communication method. Other communication methods include, for example, a power line communication (PLC (Power Line Communication) method, a 2.5 GHz band wireless communication method, etc.) The wireless communication unit 206 transmits a target power command transmitted by the gateway device 30. In response to receiving the value, the target power command value is output to the drive control unit 204. The wireless communication unit 206 is a current sensor (not shown) installed between the power conversion circuit 202 and the load 50. The output current detected by is acquired and transmitted to the gateway device 30.
　時刻取得部２０８は、ゲートウェイ装置３０および他の電力変換装置２０に依存せずに時刻情報を取得する。ゲートウェイ装置３０および他の電力変換装置２０に依存せずに時刻情報を取得することには、ゲートウェイ装置３０および電力変換装置２０以外の外部装置から時刻情報を取得することが含まれる。第１の実施形態において、外部装置とは、標準電波を送信する送信局である。 The time acquisition unit 208 acquires time information without depending on the gateway device 30 and other power conversion devices 20. Acquiring time information without depending on the gateway device 30 and other power conversion devices 20 includes acquiring time information from an external device other than the gateway device 30 and the power conversion device 20. In the first embodiment, the external device is a transmitting station that transmits a standard radio wave.
　時刻取得部２０８は、アンテナ部２０８ａ、電波受信部２０８ｂおよびＩＣ（Integrated　Circuit）等の制御回路（不図示）を備える。時刻取得部２０８は、標準電波を送信する送信局（不図示）から受信された標準電波をアンテナ部２０８ａにより受信することで、電波受信部２０８ｂにより時刻情報を取得する。電波受信部２０８ｂは、制御回路の制御に従って、例えば定期的に標準電波信号を生成する。 The time acquisition unit 208 includes an antenna unit 208a, a radio wave reception unit 208b, and a control circuit (not shown) such as an IC (Integrated Circuit). The time acquisition unit 208 acquires time information by the radio wave reception unit 208b by receiving the standard radio wave received from a transmitting station (not shown) that transmits the standard radio wave by the antenna unit 208a. The radio wave receiver 208b periodically generates a standard radio wave signal, for example, according to control of the control circuit.
　アンテナ部２０８ａは、標準電波を高い強度で受信可能な位置に形成されることが望ましい。アンテナ部２０８ａは、例えば、住宅の屋根１００ａの近傍に形成される。時刻取得部２０８の制御回路は、生成した標準電波信号を時刻情報としてゲートウェイ装置３０に送信するように、無線通信部２０６に指示する。これにより、時刻取得部２０８は、時刻情報を取得する時刻取得部として機能する。また、無線通信部２０６は、時刻取得部により取得された時刻情報を送信する送信部として機能する。 The antenna unit 208a is preferably formed at a position where the standard radio wave can be received with high intensity. The antenna part 208a is formed in the vicinity of the roof 100a of a house, for example. The control circuit of the time acquisition unit 208 instructs the wireless communication unit 206 to transmit the generated standard radio signal to the gateway device 30 as time information. Thereby, the time acquisition unit 208 functions as a time acquisition unit that acquires time information. The wireless communication unit 206 functions as a transmission unit that transmits time information acquired by the time acquisition unit.
　図３は、第１の実施形態の太陽光発電システム１におけるゲートウェイ装置３０の構成を示すブロック図である。ゲートウェイ装置３０は、例えば、住宅内の空間１００ｂまたは屋外などの分電盤付近に設けられる。ゲートウェイ装置３０は、複数の電力変換装置２０の無線通信部２０６と通信可能であり、電力変換装置２０を制御する制御装置である。ゲートウェイ装置３０は、集中制御部３０２と、無線通信部３０４と、宅内通信部３０６と、時計機能部３０８と、スケジュール記憶部３１０と、表示部３１２とを備える。 FIG. 3 is a block diagram illustrating a configuration of the gateway device 30 in the solar power generation system 1 according to the first embodiment. The gateway device 30 is provided, for example, near a distribution board such as a space 100b in a house or outdoors. The gateway device 30 is a control device that can communicate with the wireless communication units 206 of the plurality of power conversion devices 20 and controls the power conversion devices 20. The gateway device 30 includes a central control unit 302, a wireless communication unit 304, a home communication unit 306, a clock function unit 308, a schedule storage unit 310, and a display unit 312.
　宅内通信部３０６は、ＬＡＮ（Local　Area　Network）等の宅内ネットワークを介して、インターネット等の外部のネットワークに接続される。宅内通信部３０６は、集中制御部３０２の制御に従って電力変換装置２０の出力電力を制御するための情報を受信し、電力変換装置２０の出力電力を制御するための情報を集中制御部３０２に出力する。 The home communication unit 306 is connected to an external network such as the Internet via a home network such as a LAN (Local Area Network). The in-home communication unit 306 receives information for controlling the output power of the power conversion device 20 according to the control of the central control unit 302, and outputs information for controlling the output power of the power conversion device 20 to the central control unit 302. To do.
　無線通信部３０４は、アンテナ部３０４ａを備え、複数の電力変換装置２０との間で無線通信を行う無線通信モジュールである。無線通信部３０４は、電力変換装置２０の無線通信部２０６と同じプロトコルに従って通信処理を行い、所定の搬送周波数を利用して無線通信部２０６との間で無線信号を送受信する。無線通信部３０４は、例えば小電力無線の９２０ＭＨｚ帯の搬送周波数を利用する。なお、無線通信部３０４の通信方式は、無線通信部２０６との間で通信可能な方式であればよい。無線通信部３０４は、無線通信部２０６により送信された標準電波信号を、時刻情報として受信する受信部として機能する。無線通信部３０４は、受信した時刻情報を集中制御部３０２に出力する。 The wireless communication unit 304 is a wireless communication module that includes the antenna unit 304a and performs wireless communication with the plurality of power conversion devices 20. The wireless communication unit 304 performs communication processing according to the same protocol as the wireless communication unit 206 of the power conversion device 20, and transmits and receives wireless signals to and from the wireless communication unit 206 using a predetermined carrier frequency. The wireless communication unit 304 uses, for example, a carrier frequency in the 920 MHz band of low power wireless. Note that the communication method of the wireless communication unit 304 may be any method that allows communication with the wireless communication unit 206. The wireless communication unit 304 functions as a reception unit that receives the standard radio wave signal transmitted by the wireless communication unit 206 as time information. The wireless communication unit 304 outputs the received time information to the central control unit 302.
　スケジュール記憶部３１０は、ＨＤＤ（Hard　Disc　Drive）、フラッシュメモリ、ＥＥＰＲＯＭ（Electrically　Erasable　Programmable　Read　Only　Memory）、ＲＯＭ（Read　Only　Memory）、またはＲＡＭ（Random　Access　Memory）等により実現される。スケジュール記憶部３１０は、宅内通信部３０６により受信され、集中制御部３０２から入力された電力変換装置２０の出力電力を制御するための情報を記憶する。電力変換装置２０の出力電力を制御するための情報は、例えば、商用電力系統４０を運営する電力会社により生成される。電力変換装置２０の出力電力を制御するための情報は、例えば、電力変換装置２０を特定する識別情報と、電力変換装置２０を制御する時刻情報と、電力変換装置２０の最大出力可能電力に対する出力電力の割合［％］を表す出力抑制情報とが対応づけられている。なお、以下の説明において、各電力変換装置２０の識別情報と、時刻情報と、出力抑制情報とが対応づけられた情報を、「スケジュール情報」と記載する。 The schedule storage unit 310 is realized by an HDD (Hard Disc Drive), flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), ROM (Read Only Memory), RAM (Random Access Memory), or the like. The schedule storage unit 310 stores information for controlling the output power of the power conversion device 20 received by the home communication unit 306 and input from the central control unit 302. Information for controlling the output power of the power converter 20 is generated by, for example, an electric power company that operates the commercial power system 40. The information for controlling the output power of the power conversion device 20 includes, for example, identification information for identifying the power conversion device 20, time information for controlling the power conversion device 20, and an output for the maximum output power of the power conversion device 20. Output suppression information indicating the power ratio [%] is associated. In the following description, information in which identification information, time information, and output suppression information of each power conversion device 20 are associated is referred to as “schedule information”.
　スケジュール記憶部３１０には、集中制御部３０２によって、宅内通信部３０６により受信されたスケジュール情報が記憶されてもよい。また、スケジュール記憶部３１０には、ＵＳＢ（Universal　Serial　Bus）メモリ等の外部記憶媒体に記憶されたスケジュール情報が記憶されてもよい。外部記憶媒体は、例えば保守業者によってゲートウェイ装置３０に接続され、記憶されたスケジュール情報が読みだされる。 The schedule information received by the home communication unit 306 by the central control unit 302 may be stored in the schedule storage unit 310. The schedule storage unit 310 may store schedule information stored in an external storage medium such as a USB (Universal Serial Bus) memory. The external storage medium is connected to the gateway device 30 by a maintenance company, for example, and the stored schedule information is read out.
　時計機能部３０８は、時刻を計時する。時計機能部３０８により計時される時刻は、集中制御部３０２により参照される。時計機能部３０８は、集中制御部３０２により出力された時刻情報に、自身が計時している時刻情報を補正する。 The clock function unit 308 measures time. The time measured by the clock function unit 308 is referred to by the central control unit 302. The clock function unit 308 corrects the time information measured by itself to the time information output from the central control unit 302.
　表示部３１２は、住宅の住民に各種の情報を提示する表示装置である。表示部３１２は、集中制御部３０２により表示内容が制御される。表示部３１２には、例えば太陽電池モジュール１０の発電状態または電力変換装置２０の出力電力の抑制状態などの情報を表示する。 The display unit 312 is a display device that presents various information to the residents of the house. The display content of the display unit 312 is controlled by the central control unit 302. The display unit 312 displays information such as the power generation state of the solar cell module 10 or the output power suppression state of the power converter 20.
　集中制御部３０２は、演算回路および制御回路としてのＣＰＵ（Central　Processing　Unit）等のプロセッサが、メモリに記憶されたプログラムを実行することで機能するソフトウェア機能部であってもよいし、ＬＳＩ（Large Scale Integration）やＡＳＩＣ（Application Specific Integrated Circuit）等のハードウェア機能部であってもよい。集中制御部３０２は、無線通信部３０４を介して電力変換装置２０（時刻取得部２０８を有するもの）から入力された時刻情報に基づいて、時計機能部３０８において計時されている時刻を補正させる。これにより、集中制御部３０２は、標準電波に基づく時刻情報と、時計機能部３０８により計時されている時刻情報とを同期させる。 The central control unit 302 may be a software function unit that functions when a processor such as a CPU (Central Processing Unit) as an arithmetic circuit and a control circuit executes a program stored in a memory, or an LSI (Large A hardware function unit such as Scale (Integration) or ASIC (Application Specific Specific Integrated Circuit) may be used. The central control unit 302 corrects the time counted by the clock function unit 308 based on the time information input from the power conversion device 20 (having the time acquisition unit 208) via the wireless communication unit 304. As a result, the central control unit 302 synchronizes the time information based on the standard radio wave and the time information measured by the clock function unit 308.
　また、集中制御部３０２は、時計機能部３０８により計時されている現在の時刻とスケジュール情報に格納された時刻とを比較することで、電力変換装置２０の出力電力を抑制する制御タイミングが到来したか否かを判定する。集中制御部３０２は、電力変換装置２０の出力電力を抑制する制御タイミングが到来した場合に、スケジュール情報における出力抑制情報に基づいて、電力変換装置２０の出力を抑制させる目標電力指令値を、制御信号として生成する。集中制御部３０２は、スケジュール情報における識別情報に基づいて、生成した制御信号を無線通信部３０４から電力変換装置２０に送信させる。これにより、集中制御部３０２は、電力変換装置２０により出力電力を制御させる。また、集中制御部３０２は、無線通信部３０４から入力した電力変換装置２０の出力電流に基づいて、電力変換装置２０の出力電力を監視する。 In addition, the central control unit 302 has reached the control timing for suppressing the output power of the power conversion device 20 by comparing the current time measured by the clock function unit 308 with the time stored in the schedule information. It is determined whether or not. The central control unit 302 controls a target power command value that suppresses the output of the power conversion device 20 based on the output suppression information in the schedule information when the control timing for suppressing the output power of the power conversion device 20 arrives. Generate as a signal. The central control unit 302 transmits the generated control signal from the wireless communication unit 304 to the power conversion device 20 based on the identification information in the schedule information. Accordingly, the central control unit 302 controls the output power by the power conversion device 20. Further, the central control unit 302 monitors the output power of the power conversion device 20 based on the output current of the power conversion device 20 input from the wireless communication unit 304.
　以上説明したように、第１の実施形態の太陽光発電システム１によれば、電力変換装置２０により、ゲートウェイ装置３０および他の電力変換装置２０に依存せずに時刻情報を取得し、当該取得した時刻情報をゲートウェイ装置３０における計時させる時刻情報に同期させる。これにより、太陽光発電システム１によれば、外部のネットワークに依存することなくゲートウェイ装置３０の内部の時刻を同期させることができ、ゲートウェイ装置３０において計時されている時刻に対する同期の精度を高くすることができる。 As described above, according to the photovoltaic power generation system 1 of the first embodiment, the power conversion device 20 acquires time information without depending on the gateway device 30 and the other power conversion devices 20, and the acquisition is performed. The time information is synchronized with the time information to be timed in the gateway device 30. Thereby, according to the photovoltaic power generation system 1, it is possible to synchronize the internal time of the gateway device 30 without depending on an external network, and the synchronization accuracy with respect to the time measured in the gateway device 30 is increased. be able to.
　例えば、ゲートウェイ装置３０において計時されている時刻を外部のネットワークにおけるＮＴＰサーバにより送信された時刻情報に同期させる場合には、宅内通信部３０６と外部のネットワークとの接続状態に依存して、ゲートウェイ装置３０において計時されている時刻の同期の精度が低下する可能性がある。また、ゲートウェイ装置３０において標準電波を受信する場合には、ゲートウェイ装置３０が住宅内の空間１００ｂに設置されているため、電波の受信感度に依存してゲートウェイ装置３０において計時されている時刻の同期の精度が低下する可能性がある。さらに、住宅の事情によっては、ゲートウェイ装置３０が外部のネットワークと通信できない場合があり、ゲートウェイ装置３０において計時されている時刻が補正できない場合がある。すなわち、ゲートウェイ装置３０の設置環境に依存して、ゲートウェイ装置３０において計時されている時刻の同期の精度が低下する可能性があった。これに対し、第１の実施形態の太陽光発電システム１によれば、ゲートウェイ装置３０の設置環境に依存せずに、ゲートウェイ装置３０において計時している時刻を、標準電波に基づく時刻に高い精度で同期させることができる。また、第１の実施形態の太陽光発電システム１によれば、ゲートウェイ装置３０の設置位置に自由度を持たせることができる。さらに、第１の実施形態の太陽光発電システム１によれば、ゲートウェイ装置３０において計時されている時刻を管理するための保守作業を単純化することができる。 For example, when synchronizing the time measured in the gateway device 30 with the time information transmitted by the NTP server in the external network, the gateway device depends on the connection state between the home communication unit 306 and the external network. There is a possibility that the synchronization accuracy of the time counted at 30 may be lowered. When the standard radio waves are received by the gateway device 30, the gateway device 30 is installed in the space 100 b in the house, so that the time measured by the gateway device 30 is synchronized depending on the radio wave reception sensitivity. Accuracy may be reduced. Furthermore, depending on housing circumstances, the gateway device 30 may not be able to communicate with an external network, and the time measured by the gateway device 30 may not be corrected. That is, depending on the installation environment of the gateway device 30, there is a possibility that the accuracy of time synchronization counted in the gateway device 30 may be lowered. On the other hand, according to the photovoltaic power generation system 1 of the first embodiment, the time measured in the gateway device 30 is highly accurate to the time based on the standard radio wave without depending on the installation environment of the gateway device 30. Can be synchronized. Moreover, according to the solar power generation system 1 of 1st Embodiment, a freedom degree can be given to the installation position of the gateway apparatus 30. FIG. Furthermore, according to the photovoltaic power generation system 1 of the first embodiment, maintenance work for managing the time counted by the gateway device 30 can be simplified.
　また、第１の実施形態の太陽光発電システム１によれば、ゲートウェイ装置３０において計時されている時刻に基づいて、電力変換装置２０の出力電力を制御するので、時刻に対して高い精度で電力変換装置２０の出力電力を制御することができる。この結果、第１の実施形態の太陽光発電システム１によれば、電力変換装置２０の出力電力を抑制することを要求する電力会社に対する電力変換装置２０の信頼性を高くすることができる。 Moreover, according to the photovoltaic power generation system 1 of the first embodiment, since the output power of the power conversion device 20 is controlled based on the time counted in the gateway device 30, the power is highly accurate with respect to the time. The output power of the converter 20 can be controlled. As a result, according to the photovoltaic power generation system 1 of the first embodiment, the reliability of the power conversion device 20 with respect to an electric power company that requests to suppress the output power of the power conversion device 20 can be increased.
　なお、上述した太陽光発電システム１において、時刻取得部２０８における電波受信部２０８ｂは、標準電波を受信する構成に代えて、セルラー網または無線ＬＡＮを介して通信を行う無線通信モジュールを構成であってもよい。電波受信部２０８ｂは、セルラー網または無線ＬＡＮを介して時刻補正サーバ（不図示）と通信を確立し、時刻補正サーバにより送信された時刻情報を無線データとして受信する。時刻取得部２０８は、取得した時刻情報を、無線通信部２０６によりゲートウェイ装置３０に送信させる。集中制御部３０２は、無線通信部３０４により出力された時刻情報に基づいて、時計機能部３０８において計時されている時刻を補正させる。これにより、集中制御部３０２は、時刻補正サーバにより送信された時刻情報と、時計機能部３０８により計時されている時刻情報とを同期させる。このような太陽光発電システム１によれば、上述し第１のた実施形態と同様に、ゲートウェイ装置３０の設置環境に依存せずにゲートウェイ装置３０の内部の時刻を同期させることができ、ゲートウェイ装置３０において計時されている時刻に対する同期の精度を高くすることができる。 In the solar power generation system 1 described above, the radio wave reception unit 208b in the time acquisition unit 208 has a configuration of a wireless communication module that performs communication via a cellular network or a wireless LAN, instead of the configuration of receiving standard radio waves. May be. The radio wave reception unit 208b establishes communication with a time correction server (not shown) via a cellular network or a wireless LAN, and receives time information transmitted from the time correction server as wireless data. The time acquisition unit 208 causes the wireless communication unit 206 to transmit the acquired time information to the gateway device 30. The central control unit 302 corrects the time counted by the clock function unit 308 based on the time information output by the wireless communication unit 304. As a result, the central control unit 302 synchronizes the time information transmitted from the time correction server with the time information measured by the clock function unit 308. According to such a photovoltaic power generation system 1, as in the first embodiment described above, the time inside the gateway device 30 can be synchronized without depending on the installation environment of the gateway device 30. The accuracy of synchronization with respect to the time measured by the device 30 can be increased.
　図４は、第１の実施形態の太陽光発電システム１の他の構成を示すブロック図である。この太陽光発電システム１は、複数の電力変換装置２０－１、・・・および２０－Ｎのうち少なくとも一部の複数の電力変換装置２０に時刻取得部２０８を備える点で、上述した第１の実施形態の太陽光発電システム１とは異なる。図４に示す太陽光発電システム１は、例えば、電力変換装置２０－１および電力変換装置２０－Ｎに時刻取得部２０８－１および時刻取得部２０８－Ｎが備えられる。なお、以下の説明において、時刻取得部を他の時刻取得部と区別して説明しない場合には時刻取得部２０８と記載する。 FIG. 4 is a block diagram showing another configuration of the solar power generation system 1 according to the first embodiment. This solar power generation system 1 includes the time acquisition unit 208 in at least some of the plurality of power conversion devices 20-1,... This is different from the solar power generation system 1 of the embodiment. In the photovoltaic power generation system 1 illustrated in FIG. 4, for example, the power conversion device 20-1 and the power conversion device 20-N are provided with a time acquisition unit 208-1 and a time acquisition unit 208-N. In the following description, the time acquisition unit will be referred to as a time acquisition unit 208 when it is not described separately from other time acquisition units.
　複数の時刻取得部２０８は、上述した時刻取得部２０８と同様の機能を有する。複数の時刻取得部２０８は、時刻情報を取得し、取得した時刻情報を無線通信部２０６からゲートウェイ装置３０に送信させる。ゲートウェイ装置３０は、複数の電力変換装置２０により送信された時刻情報をそれぞれ受信する。集中制御部３０２は、無線通信部３０４によりそれぞれ受信された複数の時刻情報を比較する。集中制御部３０２は、複数の時刻情報を比較することで、複数の時刻情報が同時刻または所定の誤差の範囲であるか否かを判定する。集中制御部３０２は、複数の時刻情報が同時刻または所定の誤差の範囲である場合には、無線通信部３０４から出力された時刻情報に基づいて時計機能部３０８において計時されている時刻を補正する。集中制御部３０２は、複数の時刻情報が同時刻または所定の誤差の範囲ではない場合には、複数の時刻情報の整合がとれていないので、時計機能部３０８において計時されている時刻の補正を実施しない。 The plurality of time acquisition units 208 have the same function as the time acquisition unit 208 described above. The plurality of time acquisition units 208 acquire time information and cause the wireless communication unit 206 to transmit the acquired time information to the gateway device 30. The gateway device 30 receives time information transmitted by the plurality of power conversion devices 20. The central control unit 302 compares a plurality of time information respectively received by the wireless communication unit 304. The central control unit 302 compares the plurality of pieces of time information to determine whether the plurality of pieces of time information are within the same time or a predetermined error range. The central control unit 302 corrects the time counted by the clock function unit 308 based on the time information output from the wireless communication unit 304 when a plurality of time information is within the same time or a predetermined error range. To do. The central control unit 302 corrects the time counted by the clock function unit 308 because the plurality of time information is not consistent when the plurality of time information is not within the same time or a predetermined error range. Not implemented.
　以上の第１の実施形態の太陽光発電システム１によれば、複数の時刻取得部２０８によりそれぞれ取得された複数の時刻情報の比較結果に基づいて時計機能部３０８において計時されている時刻を補正するので、ゲートウェイ装置３０において計時されている時刻に対する同期の精度をさらに高くすることができる。また、第１の実施形態の太陽光発電システム１によれば、複数の時刻取得部２０８の設置箇所によって電波の受信感度が異なる場合であっても、複数の時刻情報の整合がとれている場合に時計機能部３０８において計時されている時刻を補正し、複数の時刻情報の整合がとれていない場合には時計機能部３０８において計時されている時刻の補正を実施しないので、時刻を補正する精度の信頼性を高くすることができる。 According to the photovoltaic power generation system 1 of the first embodiment described above, the time counted in the clock function unit 308 is corrected based on the comparison result of the plurality of time information respectively acquired by the plurality of time acquisition units 208. Therefore, the accuracy of synchronization with respect to the time counted in the gateway device 30 can be further increased. Further, according to the photovoltaic power generation system 1 of the first embodiment, even when the reception sensitivity of radio waves differs depending on the installation locations of the plurality of time acquisition units 208, a plurality of pieces of time information are consistent. The time measured by the clock function unit 308 is corrected, and when the time information is not consistent, the time measured by the clock function unit 308 is not corrected. The reliability of can be increased.
　（第２の実施形態）
　図５は、第２の実施形態の太陽光発電システム１の他の構成を示すブロック図である。この太陽光発電システム１は、電力変換装置２０－１、・・・および２０－Ｎに、時計機能部２１０－１、・・・および２１０－Ｎと、補正部２１２－１、・・・および２１２－Ｎとを備える点で、上述した第１の実施形態の太陽光発電システム１とは異なる。また、太陽光発電システム１は、時刻取得部を有しない電力変換装置２０－Ｎを備える点で、上述した第１の実施形態の太陽光発電システム１とは異なる。なお、以下の説明において、時計機能部を他の時計機能部と区別して説明しない場合には時計機能部２１０と記載する。また、補正部を他の補正部と区別して説明しない場合には補正部２１２と記載する。 (Second Embodiment)
FIG. 5 is a block diagram illustrating another configuration of the photovoltaic power generation system 1 according to the second embodiment. This solar power generation system 1 includes power conversion devices 20-1,..., And 20-N, a clock function unit 210-1,..., And 210-N, a correction unit 212-1,. 212-N is different from the solar power generation system 1 of the first embodiment described above. Further, the solar power generation system 1 differs from the solar power generation system 1 of the first embodiment described above in that it includes a power conversion device 20-N that does not have a time acquisition unit. In the following description, the clock function unit is referred to as a clock function unit 210 when it is not described separately from other clock function units. In addition, when the correction unit is not described separately from other correction units, the correction unit is referred to as a correction unit 212.
　図６は、第２の実施形態の太陽光発電システム１における電力変換装置２０－１の構成図である。電力変換装置２０－１は、第１の実施形態における電力変換装置２０と時計機能部２１０－１と補正部２１２－２を備える点で異なる。時計機能部２１０－１は、時刻取得部２０８により取得された時刻情報が供給されて、時刻を計時する。時計機能部２１０は、上述した電力変換装置２０における駆動制御部２０４に接続され、計時している時刻が駆動制御部２０４により参照される。時計機能部２１０は、ゲートウェイ装置３０および他の電力変換装置２０と依存せずに時刻を計時する。補正部２１２は、ゲートウェイ装置３０により送信され、無線通信部２０６により受信された時刻情報が供給される。補正部２１２は、ゲートウェイ装置３０において計時されている時刻に基づく時刻情報に、時計機能部２１０で計時している時刻を補正する。これにより、時計機能部２１０は、ゲートウェイ装置３０において計時されている時刻に基づく時刻情報に同期する。駆動制御部２０４は、時計機能部２１０により計時している時刻に基づいて電力変換回路２０２を制御する。 FIG. 6 is a configuration diagram of the power conversion device 20-1 in the solar power generation system 1 of the second embodiment. The power conversion device 20-1 is different in that it includes the power conversion device 20, the clock function unit 210-1, and the correction unit 212-2 in the first embodiment. The clock function unit 210-1 receives the time information acquired by the time acquisition unit 208 and measures the time. The clock function unit 210 is connected to the drive control unit 204 in the power conversion device 20 described above, and the time that is being measured is referred to by the drive control unit 204. The clock function unit 210 counts the time without depending on the gateway device 30 and the other power conversion devices 20. The correction unit 212 is supplied with time information transmitted from the gateway device 30 and received by the wireless communication unit 206. The correction unit 212 corrects the time measured by the clock function unit 210 to the time information based on the time measured by the gateway device 30. Thereby, the clock function unit 210 synchronizes with time information based on the time counted in the gateway device 30. The drive control unit 204 controls the power conversion circuit 202 based on the time counted by the clock function unit 210.
　図７は、第２の実施形態の太陽光発電システム１における電力変換装置２０－Ｎの構成図である。電力変換装置２０－Ｎは、図６に示した電力変換装置２０－１に対して、時刻取得部２０８を備えていない点で異なる。時計機能部２１０－Ｎは、時刻を計時する。時計機能部２１０は、駆動制御部２０４に接続され、計時している時刻が駆動制御部２０４により参照される。時計機能部２１０は、ゲートウェイ装置３０および他の電力変換装置２０と依存せずに時刻を計時する。補正部２１２は、ゲートウェイ装置３０により送信され、無線通信部２０６により受信された時刻情報が供給される。補正部２１２は、ゲートウェイ装置３０において計時されている時刻に基づく時刻情報に、時計機能部２１０で計時している時刻を補正する。これにより、時計機能部２１０は、ゲートウェイ装置３０において計時されている時刻に基づく時刻情報に同期する。駆動制御部２０４は、時計機能部２１０により計時している時刻に基づいて電力変換回路２０２を制御する。 FIG. 7 is a configuration diagram of the power conversion device 20-N in the solar power generation system 1 of the second embodiment. The power conversion device 20-N is different from the power conversion device 20-1 illustrated in FIG. 6 in that the time acquisition unit 208 is not provided. The clock function unit 210-N measures the time. The clock function unit 210 is connected to the drive control unit 204, and the time measured is referred to by the drive control unit 204. The clock function unit 210 counts the time without depending on the gateway device 30 and the other power conversion devices 20. The correction unit 212 is supplied with time information transmitted from the gateway device 30 and received by the wireless communication unit 206. The correction unit 212 corrects the time measured by the clock function unit 210 to the time information based on the time measured by the gateway device 30. Thereby, the clock function unit 210 synchronizes with time information based on the time counted in the gateway device 30. The drive control unit 204 controls the power conversion circuit 202 based on the time counted by the clock function unit 210.
　図８は、第２の実施形態の太陽光発電システム１において実行される処理の流れを示すシーケンス図である。ゲートウェイ装置３０は、時計機能部３０８により計時している時刻情報を電力変換装置２０に送信して、補正部２１２により時計機能部２１０の時刻を同期させる。なお、以下の説明は、複数の電力変換装置２０のうち電力変換装置２０－１および電力変換装置２０－Ｎの動作を時刻Ｔに同時に停止させる制御について説明する。 FIG. 8 is a sequence diagram showing a flow of processing executed in the solar power generation system 1 of the second embodiment. The gateway device 30 transmits the time information measured by the clock function unit 308 to the power conversion device 20, and the correction unit 212 synchronizes the time of the clock function unit 210. In the following description, the control for simultaneously stopping the operations of the power conversion device 20-1 and the power conversion device 20-N among the plurality of power conversion devices 20 at time T will be described.
　ゲートウェイ装置３０は、スケジュール情報から、電力変換装置２０－１および２０－Ｎを同時に停止させる動作時刻Ｔを抽出する。ゲートウェイ装置３０は、電力変換装置２０－１および２０－Ｎを同時に停止させる制御を実施するタイミングが到来したか否かを判定する。ゲートウェイ装置３０は、電力変換装置２０－１および２０－Ｎを同時に停止させる制御を実施するタイミングが到来したと判定したことに応じて、電力変換装置２０－１および２０－Ｎに動作時刻Ｔを示す動作時刻情報をそれぞれ送信する。ゲートウェイ装置３０は、動作時刻のｔ秒前に動作を停止させる動作時刻情報（停止（Ｔ））を、電力変換装置２０－１に送信する。また、ゲートウェイ装置３０は、動作時刻のｔ－α秒前に電力の動作を停止させる動作時刻情報（停止（Ｔ））を、電力変換装置２０－Ｎに送信する。 The gateway device 30 extracts from the schedule information the operation time T at which the power conversion devices 20-1 and 20-N are stopped simultaneously. The gateway device 30 determines whether or not it is time to execute control for simultaneously stopping the power conversion devices 20-1 and 20-N. The gateway device 30 sets the operation time T to the power conversion devices 20-1 and 20-N in response to determining that the timing for performing the control for simultaneously stopping the power conversion devices 20-1 and 20-N has arrived. The operation time information shown is transmitted. The gateway device 30 transmits operation time information (stop (T)) for stopping the operation to t seconds before the operation time to the power conversion device 20-1. Further, the gateway device 30 transmits operation time information (stop (T)) for stopping the power operation to t-α seconds before the operation time to the power conversion device 20-N.
　電力変換装置２０－１および電力変換装置２０－Ｎは、動作時刻情報を受信したことにより動作時刻情報が示す動作時刻Ｔを認識する。その後、電力変換装置２０－１および２０－Ｎは、時計機能部２１０－１および２１０－Ｎにより計時している時刻が、動作時刻情報が示す動作時刻Ｔに到ったタイミングにおいて動作を停止させる。 The power conversion device 20-1 and the power conversion device 20-N recognize the operation time T indicated by the operation time information by receiving the operation time information. Thereafter, the power conversion devices 20-1 and 20-N stop the operation when the time measured by the clock function units 210-1 and 210-N reaches the operation time T indicated by the operation time information. .
　第２の実施形態の太陽光発電システム１によれば、ゲートウェイ装置３０から複数の電力変換装置２０に動作時刻情報を送信し、各電力変換装置２０により動作時刻が到来したことを判定して電力変換装置２０の動作を制御することができる。これにより、第２の実施形態の太陽光発電システム１によれば、各電力変換装置２０の動作タイミングの精度をより高くすることができるので、電力変換装置２０の出力電力を抑制することを要求する電力会社に対する電力変換装置２０の信頼性をさらに高くすることができる。 According to the photovoltaic power generation system 1 of the second embodiment, the operation time information is transmitted from the gateway device 30 to the plurality of power conversion devices 20, and it is determined by each power conversion device 20 that the operation time has arrived. The operation of the conversion device 20 can be controlled. Thereby, according to the photovoltaic power generation system 1 of the second embodiment, since the accuracy of the operation timing of each power conversion device 20 can be further increased, it is required to suppress the output power of the power conversion device 20. The reliability of the power conversion device 20 with respect to the electric power company that performs can be further increased.
　なお、補正部２１２は、上述したゲートウェイ装置３０により計時している時刻に基づいて時計機能部２１０により計時している時刻を補正することに代えて、時刻取得部２０８により取得した時刻情報に基づいて時計機能部２１０により計時している時刻を補正してもよい。 The correction unit 212 is based on the time information acquired by the time acquisition unit 208 instead of correcting the time measured by the clock function unit 210 based on the time measured by the gateway device 30 described above. The time measured by the clock function unit 210 may be corrected.
　図９は、実施形態の太陽光発電システム１の変形例を示す図である。上述した実施形態の太陽光発電システム１は、複数の電力変換装置２０を備えているが、複数の太陽電池モジュール１０と接続されたパワーコンディショナ装置３０Ａに、上述したゲートウェイ装置３０の機能を実装してもよい。パワーコンディショナ装置３０Ａは、複数の太陽電池モジュール１０により発電された直流電力を交流電力に変換して負荷に供給する。また、変形例の太陽光発電システム１は、複数の太陽電池モジュール１０のうち少なくとも一つの太陽電池モジュール１０の近傍に、時刻取得部２０８を設置する。時刻取得部２０８により取得された時刻情報は、無線信号としてパワーコンディショナ装置３０Ａに送信される。パワーコンディショナ装置３０Ａは、時刻情報に基づいて自装置において計時されている時刻を補正する。 FIG. 9 is a diagram illustrating a modification of the photovoltaic power generation system 1 according to the embodiment. The solar power generation system 1 of the above-described embodiment includes a plurality of power conversion devices 20, but the function of the gateway device 30 described above is mounted on a power conditioner device 30A connected to the plurality of solar cell modules 10. May be. The power conditioner device 30A converts DC power generated by the plurality of solar cell modules 10 into AC power and supplies the AC power to the load. Further, the photovoltaic power generation system 1 of the modified example installs the time acquisition unit 208 in the vicinity of at least one solar cell module 10 among the plurality of solar cell modules 10. The time information acquired by the time acquisition unit 208 is transmitted as a radio signal to the power conditioner device 30A. The power conditioner device 30 </ b> A corrects the time counted by the own device based on the time information.
　以上説明した少なくともひとつの実施形態によれば、複数の電力変換装置２０のうち少なくとも一つの電力変換装置２０が、ゲートウェイ装置３０および他の電力変換装置２０に依存せずに時刻情報を取得する時刻取得部２０８を持ち、ゲートウェイ装置３０が、電力変換装置２０により取得された時刻情報に基づいて時計機能部３０８の時刻を補正する集中制御部３０２を持つので、ゲートウェイ装置３０の設置環境によらず、ゲートウェイ装置３０において時刻に対する同期の精度を高くすることができる。 According to at least one embodiment described above, the time at which at least one power conversion device 20 of the plurality of power conversion devices 20 acquires time information without depending on the gateway device 30 and the other power conversion devices 20. Since it has the acquisition part 208 and the gateway apparatus 30 has the centralized control part 302 which correct | amends the time of the clock function part 308 based on the time information acquired by the power converter device 20, it is independent of the installation environment of the gateway apparatus 30 In the gateway device 30, the accuracy of synchronization with respect to time can be increased.
　本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。 Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

Claims (9)

  1. 　複数の太陽電池モジュールに対応して設けられ、前記太陽電池モジュールから供給された直流電力を交流電力に変換する複数の電力変換装置と、
    　前記複数の電力変換装置と通信可能であり、前記複数の電力変換装置を制御する制御装置と、を備え、
    　前記複数の電力変換装置のうち少なくとも一つの電力変換装置は、前記制御装置および前記他の電力変換装置に依存せずに時刻情報を取得する時刻取得部と、前記時刻取得部により取得された時刻情報を前記制御装置に送信する送信部とを備え、
    　前記制御装置は、前記電力変換装置の送信部により送信された時刻情報を受信する受信部と、時刻を計時する時計機能部と、前記時計機能部によって計時される時刻に基づいて前記複数の電力変換装置を制御する制御部であって、前記受信部により受信された時刻情報に基づいて前記時計機能部の時刻を補正する制御部とを備える、
    　発電システム。     A plurality of power conversion devices that are provided corresponding to a plurality of solar cell modules and convert DC power supplied from the solar cell modules into AC power;
    A control device capable of communicating with the plurality of power conversion devices and controlling the plurality of power conversion devices;
    At least one power conversion device among the plurality of power conversion devices includes a time acquisition unit that acquires time information without depending on the control device and the other power conversion devices, and a time acquired by the time acquisition unit. A transmission unit for transmitting information to the control device,
    The control device includes: a receiving unit that receives time information transmitted by the transmitting unit of the power conversion device; a clock function unit that measures time; and the plurality of powers based on the time counted by the clock function unit. A control unit that controls the conversion device, the control unit correcting the time of the clock function unit based on the time information received by the receiving unit,
    Power generation system.
  2. 　前記制御装置は、時刻に対応させて前記電力変換装置それぞれの出力電力を記憶する記憶部を備え、
    　前記制御部は、前記時計機能部により計時されている時刻に基づいて、前記記憶部に記憶された前記複数の電力変換部の出力電力をそれぞれ制御する、
    　請求項１に記載の発電システム。     The control device includes a storage unit that stores output power of each of the power conversion devices in correspondence with time,
    The control unit controls the output power of the plurality of power conversion units stored in the storage unit based on the time measured by the clock function unit,
    The power generation system according to claim 1.
  3. 　前記時刻取得部および前記送信部は複数の電力変換装置のそれぞれに設けられ、
    　前記受信部は、前記複数の電力変換装置の時刻取得部によりそれぞれ取得され、前記複数の電力変換装置の送信部によりそれぞれ送信された時刻情報を受信し、
    　前記制御部は、前記受信部によりそれぞれ受信された複数の時刻情報を比較し、比較結果に基づいて前記時計機能部の時刻を補正する、
    　請求項１に記載の発電システム。     The time acquisition unit and the transmission unit are provided in each of a plurality of power conversion devices,
    The receiving unit receives time information respectively acquired by time acquisition units of the plurality of power conversion devices and transmitted by transmission units of the plurality of power conversion devices,
    The control unit compares a plurality of pieces of time information respectively received by the receiving unit, and corrects the time of the clock function unit based on a comparison result.
    The power generation system according to claim 1.
  4. 　前記時刻取得部は、標準電波を送信する送信局から受信された標準電波を受信することで、前記時刻情報を取得する、
    　請求項１に記載の発電システム。     The time acquisition unit acquires the time information by receiving a standard radio wave received from a transmitting station that transmits a standard radio wave,
    The power generation system according to claim 1.
  5. 　前記時刻取得部は、時刻補正サーバにより送信された時刻情報をセルラー網または無線ＬＡＮを介して受信することで、前記時刻情報を取得する、
    　請求項１に記載の発電システム。     The time acquisition unit acquires the time information by receiving the time information transmitted by the time correction server via a cellular network or a wireless LAN.
    The power generation system according to claim 1.
  6. 　前記複数の電力変換装置のうち少なくとも前記時刻取得部を有さない電力変換装置は、時刻を計時する時計機能部と、前記他の電力変換装置から受信した時刻情報に基づいて前記時計機能部が計時する時刻を補正する補正部を備え、
    　前記制御部は、前記複数の電力変換装置にそれぞれ動作時刻情報を送信し、
    　前記複数の電力変換装置のうち少なくとも前記時刻取得部を有さない電力変換装置は、前記時計機能部により計時している時刻が前記動作時刻情報の示す動作時刻に到ったタイミングに基づいて動作する、
    　請求項１に記載の発電システム。     The power conversion device that does not have at least the time acquisition unit among the plurality of power conversion devices includes a clock function unit that measures time, and the clock function unit based on time information received from the other power conversion device. It has a correction part that corrects the time to measure,
    The control unit transmits operation time information to each of the plurality of power conversion devices,
    The power conversion device that does not have at least the time acquisition unit among the plurality of power conversion devices operates based on the timing when the time measured by the clock function unit reaches the operation time indicated by the operation time information To
    The power generation system according to claim 1.
  7. 　複数の太陽電池モジュールにそれぞれ設けられ前記太陽電池モジュールから供給された直流電力を交流電力に変換する複数の電力変換装置と、前記電力変換装置を制御する制御装置と、を備える発電システムの時刻同期方法であって、
    　前記複数の電力変換装置のうち少なくとも一つの電力変換装置が、前記制御装置および前記他の電力変換装置に依存せずに時刻情報を取得し、取得された時刻情報を前記制御装置に送信し、
    　前記制御装置が、前記電力変換装置により送信された時刻情報を受信し、受信された時刻情報に基づいて自装置において計時されている時刻を補正する、
    　時刻同期方法。     Time synchronization of a power generation system comprising: a plurality of power conversion devices that are respectively provided in a plurality of solar cell modules and that convert DC power supplied from the solar cell modules into AC power; and a control device that controls the power conversion devices. A method,
    At least one power conversion device among the plurality of power conversion devices acquires time information without depending on the control device and the other power conversion device, and transmits the acquired time information to the control device,
    The control device receives the time information transmitted by the power conversion device, and corrects the time counted in the own device based on the received time information.
    Time synchronization method.
  8. 　複数の太陽電池モジュールに設けられ前記太陽電池モジュールから供給された直流電力を交流電力に変換する電力変換装置であって、
    　制御装置および前記他の電力変換装置に依存せずに時刻情報を取得する時刻取得部と、
    　前記時刻取得部により取得された時刻情報を前記制御装置に送信する送信部と
    　を備える、電力変換装置。     A power converter for converting direct current power supplied from the solar cell module to alternating current power provided in a plurality of solar cell modules,
    A time acquisition unit for acquiring time information without depending on the control device and the other power conversion device;
    A power conversion device comprising: a transmission unit that transmits time information acquired by the time acquisition unit to the control device.
  9. 　複数の太陽電池モジュールにそれぞれ設けられ前記太陽電池モジュールから供給された直流電力を交流電力に変換する電力変換回路を備える複数の電力変換装置を制御する同期制御装置であって、
    　前記複数の電力変換装置のうち少なくとも一つの電力変換装置により、自装置および前記他の電力変換装置に依存せずに取得された時刻情報を受信する受信部と、
    　時刻を計時する時計機能部と、
    　前記受信部により受信された時刻情報に基づいて前記時計機能部の時刻を補正する制御部と
    　を備える、同期制御装置。     A synchronous control device that controls a plurality of power conversion devices including a power conversion circuit that is provided in each of a plurality of solar cell modules and converts DC power supplied from the solar cell modules into AC power,
    A receiving unit that receives time information acquired by at least one power conversion device among the plurality of power conversion devices without depending on the own device and the other power conversion device;
    A clock function unit for measuring time,
    And a control unit that corrects the time of the timepiece function unit based on the time information received by the reception unit.
PCT/JP2015/062361 2015-04-23 2015-04-23 Power generation system, time synchronization method, power conversion device, and synchronization control device WO2016170638A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0974684A (en) * 1995-09-01 1997-03-18 Fuji Electric Co Ltd Method for detecting independent operation of inverter for system interconnection
JP2013207862A (en) * 2012-03-27 2013-10-07 Sharp Corp Power generation system, and power conditioner and output suppression management device used therefor
JP2014087244A (en) * 2012-10-26 2014-05-12 Toshiba Corp Inverter device and inverter system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0974684A (en) * 1995-09-01 1997-03-18 Fuji Electric Co Ltd Method for detecting independent operation of inverter for system interconnection
JP2013207862A (en) * 2012-03-27 2013-10-07 Sharp Corp Power generation system, and power conditioner and output suppression management device used therefor
JP2014087244A (en) * 2012-10-26 2014-05-12 Toshiba Corp Inverter device and inverter system

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