JP2000166097A - Parallel operation system of solar-generating inverter - Google Patents

Parallel operation system of solar-generating inverter

Info

Publication number
JP2000166097A
JP2000166097A JP10333655A JP33365598A JP2000166097A JP 2000166097 A JP2000166097 A JP 2000166097A JP 10333655 A JP10333655 A JP 10333655A JP 33365598 A JP33365598 A JP 33365598A JP 2000166097 A JP2000166097 A JP 2000166097A
Authority
JP
Japan
Prior art keywords
inverters
power
inverter
controller
parallel operation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10333655A
Other languages
Japanese (ja)
Inventor
Toshiaki Sera
賢昭 瀬良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawamura Electric Inc
Daiwa House Industry Co Ltd
Original Assignee
Kawamura Electric Inc
Daiwa House Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawamura Electric Inc, Daiwa House Industry Co Ltd filed Critical Kawamura Electric Inc
Priority to JP10333655A priority Critical patent/JP2000166097A/en
Publication of JP2000166097A publication Critical patent/JP2000166097A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

PROBLEM TO BE SOLVED: To attain easy setting, simplification and high reliability of individual inverters, low cost and high reliability of a whole system, and easy reading of the output for the whole system. SOLUTION: This system converts a DC power generated by a solar battery 1 into AC power and feeds linkedly it to a commercial power system 2. The system is provided with a plurality of inverters 4 which are operated in parallel and a controller 5 controlling a plurality of inverters 4. The controller 5 is equipped with a means of detecting the conditions of feeding of a plurality of inverters 4 and the commercial power system, a means of generating parallel operational control signals of the respective inverters according to the conditions detected by the means, and a means of generating the display signal of the output power. The system is also provided with a display 6 displaying the output power by a signal to be outputted from the controller 5.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】この発明は、複数のインバー
タを並列運転し、商用電力系統に連系して給電する家庭
用等の太陽光発電用インバータの並列運転システムに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for parallel operation of inverters for photovoltaic power generation for home use or the like, in which a plurality of inverters are operated in parallel to supply electric power to a commercial power system.

【０００２】[0002]

【従来の技術】太陽光発電システムにおいて、発電電力
増大等の目的で、太陽電池で発電された直流電力を交流
電力に変換するインバータを複数台設置し、並列運転す
る場合がある。この場合、図７に一例を示すように、複
数のインバータ５１の出力端子を並列接続して商用電力
系統５２に接続し、インバータ５１の一台をマスター機
に、残りの各インバータ５１をスレーブ機として設定
し、マスター機からの運転制御信号により、インバータ
５１の並列運転を行っていた。なお、家庭用太陽光発電
システムに使用するインバータは、一般的に一台のみで
の単独運転と、複数台での並列運転との両用の機能を有
している。図７に示すマスター機およびスレーブ機とさ
れる個々のインバータ５１は、いずれも、このような単
独運転・並列運転の両用機能を有するものを用いてい
る。2. Description of the Related Art In a photovoltaic power generation system, a plurality of inverters for converting DC power generated by a solar cell into AC power may be installed and operated in parallel for the purpose of increasing power generation. In this case, as shown in an example in FIG. 7, the output terminals of a plurality of inverters 51 are connected in parallel to the commercial power system 52, and one of the inverters 51 is used as a master machine and the remaining inverters 51 are used as slave machines. And the parallel operation of the inverter 51 is performed by the operation control signal from the master machine. In general, an inverter used in a home photovoltaic power generation system has a function of both single operation by one unit and parallel operation by a plurality of units. Each of the individual inverters 51 shown as a master unit and a slave unit shown in FIG. 7 has such a function as both the single operation and the parallel operation.

【０００３】[0003]

【発明が解決しようとする課題】上記従来の並列運転シ
ステムは、次のような課題〜がある。 各インバータ５１をマスター機またはスレーブ機に設
定しなくてはならないため設定上の煩わしさがある。そ
のため、誤設定も生じやすい。 各インバータ５１は、各々が、商用電力系統状況検出
装置、給電状況検出装置、および出力電力の表示装置５
３等の商用電力系統５２に連系して給電するために必要
な装置を全て有しており、そのためインバータ５１の価
格が高価となり、並列運転のためにインバータを複数台
設置する場合は、システム価格も高価になっていた。 各インバータ５１の商用電力系統５２への出力電力
は、各インバータ５１毎に付属の表示装置５３で読み取
ることができる。しかし、並列運転システム全体での出
力電力を求める場合は、全ての表示装置５３の表示値を
読み取り、合計量を計算しなければならないという煩わ
しさがあった。 各インバータ５１が、それぞれ高度な制御機能を持
ち、また表示装置５３が付属したものであるため、個々
のインバータ５１が大きく、並列運転のために複数台設
置すると、設置場所が大きく必要になる。The above conventional parallel operation system has the following problems. Since each inverter 51 must be set as a master unit or a slave unit, there is a trouble in setting. Therefore, erroneous settings are likely to occur. Each inverter 51 includes a commercial power system status detecting device, a power feeding status detecting device, and an output power display device 5.
3 has all the necessary devices for interconnecting and supplying power to the commercial power system 52, such as the third power system. Therefore, the price of the inverter 51 is high. If a plurality of inverters are installed for parallel operation, the system The price was also expensive. The output power of each inverter 51 to the commercial power system 52 can be read by a display device 53 attached to each inverter 51. However, when calculating the output power of the entire parallel operation system, there is a trouble that the display values of all the display devices 53 must be read and the total amount must be calculated. Since each of the inverters 51 has an advanced control function and is provided with the display device 53, the individual inverters 51 are large, and if a plurality of inverters are installed for parallel operation, a large installation space is required.

【０００４】この発明の目的は、設定が容易で、省力
化、誤設定の防止が図れ、また重複した制御手段等が削
減できて、個々のインバータを単純化、高信頼性化で
き、システム全体の低価格化、高信頼性化が図れる太陽
光発電用インバータの並列運転システムを提供すること
である。この発明の他の目的は、出力の表示手段の設置
および読み取りが容易に行えるようにすることである。
この発明のさらに他の目的は、システム全体の一層のコ
ンパクト化と共に、電気系統の接続を容易とし、種々異
なる並列数のインバータ並列数への対処や、並列数の変
更の対処を容易とすることである。SUMMARY OF THE INVENTION An object of the present invention is to facilitate setting, save labor and prevent erroneous setting, reduce redundant control means and the like, simplify individual inverters, increase reliability, and improve the overall system. It is an object of the present invention to provide a parallel operation system of inverters for photovoltaic power generation that can reduce the cost and increase the reliability of the inverter. Another object of the present invention is to facilitate installation and reading of output display means.
Still another object of the present invention is to further reduce the size of the entire system, facilitate connection of an electric system, and easily cope with various parallel numbers of inverters and change of the parallel number. It is.

【０００５】[0005]

【課題を解決するための手段】この発明の太陽光発電用
インバータの並列運転システムは、太陽電池（１）で発
電された直流電力を交流電力に変換し、商用電力系統
（２）に連系して給電する並列運転システムにおいて、
並列運転される複数のインバータ（４）と、これら複数
のインバータ（４）による給電状況および商用電力系統
（２）の状況を検出して前記各インバータ（４）に並列
運転制御信号を与えるコントローラ（５）とを備えるこ
とを特徴とする。この構成のシステムによると、コント
ーラ（５）は、給電状況および商用電力系統（２）の状
況を検出して並列運転の制御信号を各インバータ（４）
に送出し、各インバータ（４）の運転を制御する。並列
運転用の各インバータ（４）は、直流電力を交流電力に
変換する機能、および自己保護機能等のように実機とし
て必要な最低限の追加機能に機能限定した単純な構成に
できる。このようにインバータ（４）の構成を単純にで
きるため、インバータ（４）の高信頼性、小型化につな
がると共に、システム全体の低価格化、高信頼化が得ら
れる。また、マスター・スレーブの設定が不要で、省力
化でき、誤設定も無くなる。A parallel operation system for an inverter for photovoltaic power generation according to the present invention converts DC power generated by a solar cell (1) into AC power and connects it to a commercial power system (2). In a parallel operation system that supplies power by
A plurality of inverters (4) that are operated in parallel, and a controller that detects a state of power supply by the plurality of inverters (4) and a state of the commercial power system (2) and supplies a parallel operation control signal to each of the inverters (4). 5). According to the system having this configuration, the controller (5) detects the power supply status and the status of the commercial power system (2), and outputs a control signal for parallel operation to each of the inverters (4).
To control the operation of each inverter (4). Each of the inverters (4) for parallel operation can have a simple configuration in which functions are limited to a minimum additional function required as a real machine, such as a function of converting DC power to AC power and a self-protection function. As described above, since the configuration of the inverter (4) can be simplified, the reliability and size of the inverter (4) can be reduced, and the price and reliability of the entire system can be reduced. Further, the setting of the master / slave is unnecessary, the labor can be saved, and there is no erroneous setting.

【０００６】この発明において、前記コントローラ
（５）は、前記複数のインバータ（１）による給電状況
および商用電力系統（２）の状況を検出する手段（７）
と、この手段（７）で検出した状況に応じて各インバー
タ（４）の並列運転制御信号を生成する手段（８）およ
び出力電力表示信号を生成する手段（９）とを備え、こ
のコントローラ（５）から出力される出力電力表示信号
により出力電力を表示する表示装置（６）を設けたもの
としても良い。この構成の場合、並列運転される複数の
インバータ（４）の総合出力電力が表示手段（６）に表
示される。そのため、使用者が実際に必要な出力電力で
あるシステム全体の総合出力電力の読み取りが容易であ
る。また、表示手段（６）が一台で済み、表示手段
（６）の設置が容易である。In the present invention, the controller (5) detects a state of power supply by the plurality of inverters (1) and a state of a commercial power system (2).
And means (8) for generating a parallel operation control signal for each inverter (4) according to the situation detected by the means (7) and means (9) for generating an output power display signal. A display device (6) for displaying output power based on the output power display signal output from (5) may be provided. In the case of this configuration, the total output power of the plurality of inverters (4) operated in parallel is displayed on the display means (6). Therefore, the user can easily read the total output power of the entire system, which is the output power actually required. Further, only one display means (6) is required, and the installation of the display means (6) is easy.

【０００７】この発明において、前記コントローラ
（５）が取付けられかつ前記各インバータ（４）が一列
に並べて着脱可能に取付けられる取付板（２０）を設け
てもよい。この取付板（２０）は、前記コントローラ
（５）に接続されかつインバータ（４）の並び方向に沿
う複数本の導体（２１）を有し、前記各インバータ
（４）は、前記取付板（２０）の導体（２１）に接触す
る接触端子（２２）を有するものとする。このように、
コントローラ（５）が取付けられた共通の取付板（２
０）に各インバータ（４）を一列に並べて取付けるよう
にすることにより、システム全体のより一層のコンパク
ト化が得られる。取付板（２０）は導体（２１）を有
し、各インバータ（４）はこれに接触する接触端子（２
２）を有するため、各インバータ（４）の並列接続およ
びコントローラ（５）との接続が簡単に行える。このた
め、種々異なる並列数のインバータ並列数への対処や、
並列数の変更の対処も容易に行える。In the present invention, a mounting plate (20) to which the controller (5) is mounted and the inverters (4) are removably mounted in a line may be provided. The mounting plate (20) has a plurality of conductors (21) connected to the controller (5) and arranged along the direction in which the inverters (4) are arranged. Each of the inverters (4) is connected to the mounting plate (20). )) To have a contact terminal (22) for contacting the conductor (21). in this way,
A common mounting plate (2) to which the controller (5) is mounted
By mounting the inverters (4) in a line in 0), the overall system can be made more compact. The mounting plate (20) has a conductor (21), and each inverter (4) has a contact terminal (2) contacting it.
2), parallel connection of each inverter (4) and connection with the controller (5) can be easily performed. For this reason, it is necessary to deal with various numbers of parallel inverters,
A change in the number of parallels can be easily handled.

【０００８】[0008]

【発明の実施の形態】この発明の一実施形態を図１ない
し図６に基づいて説明する。この太陽光発電用インバー
タの並列運転システムは、太陽電池１で発電された直流
電力を交流電力に変換し、商用電力系統２に連系して負
荷３に給電するシステムであり、並列運転される複数台
のインバータ４と、これら複数台のインバータ４を制御
する共用の一台のコントローラ５と、このコントローラ
５に接続された一つの表示装置６とを備える。太陽電池
１は、複数の太陽電池モジュールを接続したものであ
る。インバータ４は、一組の太陽電池モジュールの接続
体である各太陽電池１ごとに、１台設けられる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The parallel operation system of the photovoltaic power generation inverter is a system that converts DC power generated by the solar cell 1 into AC power, and links the commercial power system 2 to supply power to the load 3. It includes a plurality of inverters 4, a single controller 5 for controlling the plurality of inverters 4, and one display device 6 connected to the controller 5. The solar cell 1 is obtained by connecting a plurality of solar cell modules. One inverter 4 is provided for each solar cell 1 which is a connected body of one set of solar cell modules.

【０００９】コントローラ５は、複数のインバータ４に
よる給電状況および商用電力系統の状況を検出して前記
各インバータに並列運転制御信号を与える手段であり、
図２にブロック図で示す各手段および機能を備える。図
２に示すように、コントローラ５は、給電状況・系統状
況検出部７と、インバータ制御信号生成部８と、出力電
力表示信号生成部９とを備える。The controller 5 is a means for detecting the state of power supply by the plurality of inverters 4 and the state of the commercial power system and providing a parallel operation control signal to each of the inverters.
Each unit and function shown in the block diagram of FIG. 2 are provided. As shown in FIG. 2, the controller 5 includes a power supply status / system status detection unit 7, an inverter control signal generation unit 8, and an output power display signal generation unit 9.

【００１０】給電状況・系統状況検出部７は、給電電路
２９に設けた変成器（ＰＴ）、変流器（ＣＴ）、直流セ
ンサ（ＤＣ−ＣＴ）、直流地絡電流センサ（ＤＣ−ＺＣ
Ｔ）により、系統電圧、系統周波数、供給電流、直流地
絡電流等の給電状況および系統状況を取り込み、系統電
圧位相、系統電圧の上昇、系統の停電、直流電流の流
出、直流地絡電流の発生を検出し、それらの検出信号を
インバータ制御信号生成部８に送出する。また、出力電
力を計測し、そのデータを出力電力表示信号生成部９に
送出する。The power supply status / system status detection unit 7 includes a transformer (PT), a current transformer (CT), a DC sensor (DC-CT), a DC ground fault current sensor (DC-ZC
T), the power supply status and system status such as system voltage, system frequency, supply current, and DC ground fault current are captured, and the system voltage phase, system voltage rise, system power failure, DC current outflow, DC ground fault current The occurrence is detected, and the detection signals are sent to the inverter control signal generator 8. Also, it measures the output power and sends the data to the output power display signal generator 9.

【００１１】インバータ並列運転制御信号生成部８は、
給電状況・系統状況検出部７から信号を受け、並列運転
制御信号として次の各信号ａ〜ｄを生成し、各インバー
タ４に送出する手段である。出力電流位相同期信号ａ
は、全インバータ４の出力電流位相を揃え、かつ系統電
圧位相に対して一定周期でわずかに変動させるための信
号である。商用電力系統２が停電した場合、インバータ
４の単独運転となるが、位相変動による周波数変化を検
出して系統の停電が検出できる。全インバータ開列信号
ｂは、商用電力系統２の停電を検出した場合、および商
用電力系統２の過電圧がインバータ４の制御では低下で
きない場合に、全インバータ４を系統から開列するため
の信号である。異常インバータ検出・開列信号ｃは、直
流電流、直流地絡電流が発生した場合に、インバータ４
を順次開列して異常インバータ４を検出し、異常インバ
ータ４のみを商用電力系統２から開列するための信号で
ある。出力電流位相進相信号ｄは、商用電力系統２の電
圧が上昇した場合に、インバータ４の出力電力位相を進
相させることにより系統電圧を下げるための信号であ
る。出力電流抑制信号ｅは、商用電力系統２の電圧が上
昇した場合、インバータ４の出力電流位相を進相させて
も系統電圧が下がらない場合に、インバータ４の出力電
流を小さくして系統電圧を下げるための信号である。こ
れでも系統電圧が高い場合はインバータ４を開列する。The inverter parallel operation control signal generation unit 8
This is a unit that receives a signal from the power supply status / system status detection unit 7, generates the following signals a to d as parallel operation control signals, and sends the signals to the inverters 4. Output current phase synchronization signal a
Is a signal for aligning the output current phases of all the inverters 4 and for slightly varying the system voltage phase in a constant cycle. When the commercial power system 2 is out of power, the inverter 4 is operated independently, but a power change in the system can be detected by detecting a frequency change due to a phase change. The all-inverter open signal b is a signal for opening all the inverters 4 from the system when a power failure of the commercial power system 2 is detected and when the overvoltage of the commercial power system 2 cannot be reduced by the control of the inverter 4. The abnormal inverter detection / opening signal c indicates that the inverter 4
Are sequentially opened to detect the abnormal inverter 4, and only the abnormal inverter 4 is opened from the commercial power system 2. The output current phase advance signal d is a signal for lowering the system voltage by advancing the output power phase of the inverter 4 when the voltage of the commercial power system 2 increases. The output current suppression signal e is used to reduce the output current of the inverter 4 and reduce the system voltage when the voltage of the commercial power system 2 increases and when the system voltage does not decrease even if the output current phase of the inverter 4 is advanced. It is a signal for lowering. If the system voltage is still high, the inverter 4 is opened.

【００１２】出力電力表示信号生成部９は、給電状況・
系統状況検出部７および各インバータ４からの出力電力
データを受け、これを演算して商用電力系統２への総合
出力電力（太陽光発電電力）を求め、その総合出力電力
および各インバータ４の電力表示信号を表示装置６に送
出する。図６に示すように、表示装置６は、正面に液晶
パネル等による表示部６ａを有し、出力電力を数字で表
示可能としてある。[0012] The output power display signal generation unit 9 is provided with a power supply status
Output power data from the system status detection unit 7 and each of the inverters 4 is received and calculated to obtain the total output power (photovoltaic power) to the commercial power system 2, and the total output power and the power of each inverter 4 are calculated. The display signal is sent to the display device 6. As shown in FIG. 6, the display device 6 has a display unit 6a such as a liquid crystal panel on the front, and is capable of displaying output power by numerals.

【００１３】図３は、インバータ４のブロック図であ
る。インバータ４は、インバータ制御部１０からの信号
により、直流−交流変換部１１および開閉部１２を制御
することにより、太陽電池１で発電された直流電力を交
流電力に変換し、交流電流を商用電力系統２に送出する
手段である。FIG. 3 is a block diagram of the inverter 4. The inverter 4 converts the DC power generated by the solar cell 1 into AC power by controlling the DC-AC conversion unit 11 and the switching unit 12 based on a signal from the inverter control unit 10, and converts the AC current into commercial power. This is a means for sending to the system 2.

【００１４】直流−交流変換部１１は、インバータ制御
部１０からの指令に基づいて、太陽電池１で発電された
直流電力を交流電力に変換し、交流電流を商用電力系統
２に出力する。開閉部１２は、インバータ制御部１０か
らの指令に基づいて、インバータ出力と商用電力系統２
との接続、開列を行う手段である。The DC-AC converter 11 converts DC power generated by the solar cell 1 into AC power based on a command from the inverter controller 10 and outputs the AC current to the commercial power system 2. The opening / closing unit 12 is connected to the inverter output and the commercial power system 2 based on a command from the inverter control unit 10.
This is a means for connecting and opening the connection.

【００１５】インバータ制御部１０は、太陽電池１の発
電電力データ、インバータ出力電流の波形・位相・電流
値データ、およびコントローラ５よりの制御信号に基づ
いて次の信号ｆ〜ｊを生成し、直流−交流変換部１１お
よび開閉部１２に送出する手段である。The inverter control unit 10 generates the following signals f to j based on the generated power data of the solar cell 1, the waveform / phase / current value data of the inverter output current, and the control signal from the controller 5, -A means for sending to the AC converter 11 and the opening and closing unit 12.

【００１６】出力電流波形制御信号ｆは、フィードバッ
ク制御により出力電流波形が常に正弦波になるように出
力電流波形を指令する信号である。出力電流位相制御信
号ｇは、コントローラ５からの出力電流位相信号・出力
電流位相進相信号に基づいて出力電流位相を指令する信
号である。出力電流抑制制御信号ｈは、自インバータ４
の出力電流値がインバータ４の定格を超えた場合および
コントローラ５からの出力電流抑制信号を受けた場合に
出力電流値を現在値より下げることを指令する信号であ
る。起動・停止制御信号ｉは、太陽電池１の発生電圧が
設定値以上になった場合にインバータ４の運転開始およ
び商用電力系統２への接続を指令する信号である。すな
わち、この信号ｉは、太陽電池１の発生電圧が設定値以
下になった場合、またはコントローラ５およびインバー
タ異常検出部１３からの停止信号を受けた場合に商用電
力系統２からの開列およびインバータ１の運転停止を指
令する信号である。最大電力点追随制御信号ｊは、出力
電流値を常に太陽電池１の出力電力が最大となる方向に
変化させる信号である。The output current waveform control signal f is a signal for instructing the output current waveform by feedback control so that the output current waveform always becomes a sine wave. The output current phase control signal g is a signal for commanding the output current phase based on the output current phase signal / output current phase advance signal from the controller 5. The output current suppression control signal h is
When the output current value exceeds the rating of the inverter 4 and when an output current suppression signal is received from the controller 5, this is a signal for instructing to lower the output current value from the current value. The start / stop control signal i is a signal for instructing the start of the operation of the inverter 4 and the connection to the commercial power system 2 when the generated voltage of the solar cell 1 becomes equal to or higher than the set value. That is, this signal i indicates that the disconnection from the commercial power system 2 and the inverter 1 have occurred when the generated voltage of the solar cell 1 has become equal to or lower than the set value, or when a stop signal has been received from the controller 5 and the inverter abnormality detector 13. This is a signal for instructing the stop of the operation of. The maximum power point tracking control signal j is a signal that constantly changes the output current value in a direction in which the output power of the solar cell 1 becomes maximum.

【００１７】インバータ異常検出部１３は、装置温度異
常、入出力特性異常、制御状態異常、動作状態異常等の
発生を検出する手段によりイバータ４の異常を検出し、
インバータ制御部１０および警報装置１５に信号を送出
する。この信号によりインバータ４は商用電力系統２よ
り開列して運転を停止し、警報装置１５は警報動作を開
始する。異常状態が解消した場合には、信号を停止して
運転を再開させるとともに警報装置１５の動作を停止さ
せる。The inverter abnormality detecting section 13 detects abnormality of the inverter 4 by means for detecting occurrence of abnormality of the apparatus temperature, abnormality of the input / output characteristics, abnormality of the control state, abnormality of the operation state, and the like.
A signal is sent to the inverter control unit 10 and the alarm device 15. In response to this signal, the inverter 4 opens from the commercial power system 2 to stop the operation, and the alarm device 15 starts the alarm operation. When the abnormal state is resolved, the signal is stopped, the operation is restarted, and the operation of the alarm device 15 is stopped.

【００１８】警報装置１５は、インバータ異常検出部１
３からの信号を受け、異常表示を行うと共に警報を発す
る。インバータ出力電力計測部１４は、自インバータ４
の出力電力を計測し、そのデータをコントローラ５に送
出する手段である。The alarm device 15 includes an inverter abnormality detecting unit 1
Upon receiving the signal from the control unit 3, an error is displayed and an alarm is issued. Inverter output power measuring unit 14 has its own inverter 4
And outputs the data to the controller 5.

【００１９】この構成の並列運転システムによると、並
列運転用の各インバータ４は、直流電力を交流電力に変
換する機能、および自己保護機能等のように実機として
必要な最低限の追加機能に機能限定した単純な構成にで
きる。そのため、インバータ４の高信頼性、小型化につ
ながると共に、システム全体の低価格化、高信頼化が得
られる。また、マスター・スレーブの設定が不要で、省
力化でき、誤設定も無くなる。さらに、並列運転される
複数のインバータ４の総合出力電力が表示装置６に表示
されるため、使用者が実際に必要な出力電力であるシス
テム全体の総合出力電力の読み取りが容易である。しか
も、表示装置６が一台で済み、表示装置６の設置が容易
である。According to the parallel operation system having this configuration, each inverter 4 for parallel operation functions as a function of converting DC power into AC power and a minimum additional function required as a real machine such as a self-protection function. It can be a limited and simple configuration. Therefore, the reliability and size of the inverter 4 can be reduced, and the price and reliability of the entire system can be reduced. Further, the setting of the master / slave is unnecessary, the labor can be saved, and there is no erroneous setting. Furthermore, since the total output power of the plurality of inverters 4 operated in parallel is displayed on the display device 6, it is easy for the user to read the total output power of the entire system, which is the output power actually required. Moreover, only one display device 6 is required, and the installation of the display device 6 is easy.

【００２０】図４，図５は、この並列運転システムを構
成する機器の組立状態および分解状態の外観を各々示
す。この太陽光発電用インバータの並列運転システム
は、コントローラ５の取付けられた取付板２０を備え、
この取付板２０に、各インバータ４が一列に並べて着脱
可能に取付けられるユニット式のものである。この取付
板２０は、複数本の導体２１を有し、各インバータ４
は、取付板２０の導体２１に接触する接触端子２２を有
する。導体２１は、コントローラ５に接続され、かつイ
ンバータ４の並び方向に沿って設けられる。導体２１
は、強電用配線となるものと、制御信号用の弱電用配線
となるものとが設けられる。取付板２０に対する各イン
バータ４の取付および電気系統の接続は、ソケット式
に、取付板２０にインバータ４を嵌め込むことで行える
ようにしてある。FIGS. 4 and 5 show the appearance of the components constituting the parallel operation system in the assembled state and the disassembled state, respectively. The parallel operation system of the inverter for photovoltaic power generation includes a mounting plate 20 on which the controller 5 is mounted,
The unit type is such that the inverters 4 are removably mounted on the mounting plate 20 in a line. This mounting plate 20 has a plurality of conductors 21 and each inverter 4
Has a contact terminal 22 that contacts the conductor 21 of the mounting plate 20. The conductor 21 is connected to the controller 5 and provided along the direction in which the inverters 4 are arranged. Conductor 21
Are provided as wirings for high current and wirings for low current for control signals. Attachment of each inverter 4 to the mounting plate 20 and connection of the electric system are performed by fitting the inverter 4 to the mounting plate 20 in a socket manner.

【００２１】取付板２０は、底板２０ａと前面カバー部
２０ｂとを有する断面Ｌ字状のものであり、前面カバー
部２０ｂの裏側に、各導体２１が上下に並べて設けられ
ている。また、底板２０ａの後縁に、各インバータ４の
位置決めおよび係止を行う係止部２３が設けられてい
る。各インバータ４は、各々樹脂製等の筐体を有する互
いに同じ外形のものであって、直方体状のブロック状に
形成され、互いに側面で接するように複数個連ねて並べ
られる。インバータ４の接触端子２２は、その前面に設
けられている。コントローラ５は、取付板２０の端部に
取付けられていて、上面に太陽電池１や商用電力系統２
との接続用、並びに表示装置６および警報装置１５等と
の接続用の端子２４が設けられている。コントローラ５
には、インバータ４と同様な側面形状のカバー２５が被
せられ、上面の端子２４はカバー２５で覆われる。The mounting plate 20 has an L-shaped cross section having a bottom plate 20a and a front cover portion 20b, and the conductors 21 are vertically arranged on the back side of the front cover portion 20b. A locking portion 23 for positioning and locking each inverter 4 is provided on the rear edge of the bottom plate 20a. Each of the inverters 4 has the same external shape and has a housing made of resin or the like, is formed in a rectangular parallelepiped block shape, and is arranged in a plurality so as to be in contact with each other on the side surface. The contact terminal 22 of the inverter 4 is provided on the front surface. The controller 5 is mounted on an end of the mounting plate 20 and has a solar cell 1 and a commercial power system 2 on the upper surface.
And a terminal 24 for connection to the display device 6 and the alarm device 15 and the like. Controller 5
Is covered with a cover 25 having the same side shape as the inverter 4, and the terminal 24 on the upper surface is covered with the cover 25.

【００２２】このように、コントローラ５が取付けられ
た共通の取付板２０に各インバータ４を一列に並べて取
付けるようにしたため、システム構成機器の全体が一つ
にまとまった一体の装置として取り扱え、そのためシス
テム全体がより一層コンパクト化され、場所を取らずに
取付けられる。また、建物等への取付けも簡単に行え
る。取付板２０は導体２１を有し、各インバータ４はこ
れに接触する接触端子２２を有するため、各インバータ
４の並列接続およびコントローラ５との接続が簡単に行
える。このため、種々異なるインバータ並列数への対処
や、並列数の変更の対処も容易に行える。As described above, since the inverters 4 are arranged in a line on the common mounting plate 20 on which the controller 5 is mounted, all the system components can be handled as one integrated device. The whole is more compact and can be mounted in a small space. Further, it can be easily attached to a building or the like. Since the mounting plate 20 has a conductor 21 and each inverter 4 has a contact terminal 22 that contacts the same, parallel connection of the inverters 4 and connection with the controller 5 can be easily performed. For this reason, it is possible to easily deal with various numbers of parallel inverters and change the number of parallel inverters.

【００２３】[0023]

【発明の効果】この発明の太陽光発電用インバータの並
列運転システムは、並列運転される複数のインバータ
と、これら複数のインバータによる給電状況および商用
電力系統の状況を検出して前記各インバータに並列運転
制御信号を与えるコントローラとを備えるため、設定が
容易で、省力化、誤設定の防止が図れ、また重複した制
御手段等を削減できて、個々のインバータを単純化、高
信頼性化でき、システム全体の低価格化、高信頼性化が
図れる。コントローラが、複数のインバータによる給電
状況および商用電力系統の状況を検出する手段と、この
手段で検出した状況に応じて各インバータの並列運転制
御信号を生成する手段、および出力電力の表示信号を生
成する手段とを備え、このコントローラから出力される
出力電力表示信号により出力電力を表示する表示装置を
設けた場合は、出力の表示手段の設置および読み取りが
容易に行える。コントローラが取付けられかつ各インバ
ータが並べて取付けられる取付板を備え、この取付板は
導体を有し、各インバータは、前記導体に接触する接触
端子を有するものとした場合は、システム全体のより一
層のコンパクト化と共に、電気系統の接続を容易とし、
種々異なるインバータ並列数への対処や、並列数の変更
の対処を容易化することができる。The parallel operation system of the inverter for photovoltaic power generation according to the present invention detects a plurality of inverters operated in parallel, a power supply state by the plurality of inverters and a state of a commercial power system, and parallels the inverters to the inverters. Since it has a controller that gives an operation control signal, setting is easy, labor saving and prevention of erroneous setting can be achieved, and redundant control means and the like can be reduced, and individual inverters can be simplified and highly reliable. The price and reliability of the entire system can be reduced. A controller configured to detect a state of power supply by a plurality of inverters and a state of a commercial power system; a unit configured to generate a parallel operation control signal for each inverter in accordance with the state detected by the unit; and a display signal of output power. And a display device for displaying the output power based on the output power display signal output from the controller, it is possible to easily install and read the output display means. A mounting plate on which the controller is mounted and on which each inverter is mounted side by side, the mounting plate having a conductor, and each inverter having contact terminals for contacting said conductor, further enhances the overall system. Along with downsizing, connection of electric system is made easy,
It is possible to easily deal with various numbers of parallel inverters and change the number of parallel inverters.

【図面の簡単な説明】[Brief description of the drawings]

【図１】この発明の一実施形態にかかる太陽光発電用イ
ンバータの並列運転システムの概念構成を示すブロック
図である。FIG. 1 is a block diagram showing a conceptual configuration of a parallel operation system of a photovoltaic power generation inverter according to an embodiment of the present invention.

【図２】そのコントローラのブロック図である。FIG. 2 is a block diagram of the controller.

【図３】そのインバータのブロック図である。FIG. 3 is a block diagram of the inverter.

【図４】同並列運転システムのインバータおよび制御装
置の組立体を示す斜視図図である。FIG. 4 is a perspective view showing an assembly of an inverter and a control device of the parallel operation system.

【図５】同組立体の分解斜視図である。FIG. 5 is an exploded perspective view of the assembly.

【図６】表示装置の斜視図である。FIG. 6 is a perspective view of a display device.

【図７】従来例の斜視図である。FIG. 7 is a perspective view of a conventional example.

【符号の説明】[Explanation of symbols]

１…太陽電池 ２…商用電力系統 ３…負荷 ４…インバータ ５…コントローラ ６…表示装置 ７…給電状況・系統状況検出部 ８…インバータ制御信号生成部 ９…出力電力表示信号生成部 ２０…取付板 ２１…導体 ２２…接触端子 DESCRIPTION OF SYMBOLS 1 ... Solar cell 2 ... Commercial power system 3 ... Load 4 ... Inverter 5 ... Controller 6 ... Display device 7 ... Power supply status / system status detection part 8 ... Inverter control signal generation part 9 ... Output power display signal generation part 20 ... Mounting plate 21: conductor 22: contact terminal

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5F051 KA01 KA03 5G066 HA11 HA13 HA15 HB03 HB06 5H007 AA06 AA12 BB07 CC05 CC09 DC02 DC05 HA03  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5F051 KA01 KA03 5G066 HA11 HA13 HA15 HB03 HB06 5H007 AA06 AA12 BB07 CC05 CC09 DC02 DC05 HA03

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 太陽電池で発電された直流電力を交流電
力に変換し、商用電力系統に連系して給電する太陽光発
電用インバータの並列運転システムにおいて、並列運転
される複数のインバータと、これら複数のインバータに
よる給電状況および商用電力系統の状況を検出して前記
各インバータに並列運転制御信号を与えるコントローラ
とを備えることを特徴とする太陽光発電用インバータの
並列運転システム。1. A parallel operation system of a solar power generation inverter for converting DC power generated by a solar cell into AC power and interconnecting and supplying power to a commercial power system; A parallel operation system for a photovoltaic power generation inverter, comprising: a controller that detects a power supply state by the plurality of inverters and a state of a commercial power system and supplies a parallel operation control signal to each of the inverters. 【請求項２】 前記コントローラは、前記複数のインバ
ータによる給電状況および商用電力系統の状況を検出す
る手段と、この手段で検出した状況に応じて各インバー
タの並列運転制御信号を生成する手段、および出力電力
の表示信号を生成する手段とを備え、このコントローラ
から出力される出力電力表示信号により出力電力を表示
する表示装置を設けた請求項１記載の太陽光発電用イン
バータの並列運転システム。2. A controller for detecting a power supply status of the plurality of inverters and a status of a commercial power system, a device for generating a parallel operation control signal for each inverter in accordance with the status detected by the controller, and 2. A parallel operation system for an inverter for photovoltaic power generation according to claim 1, further comprising means for generating a display signal of the output power, and a display device for displaying the output power based on the output power display signal output from the controller. 【請求項３】 前記コントローラが取付けられかつ前記
各インバータが一列に並べて着脱可能に取付けられる取
付板を備え、この取付板は、前記コントローラに接続さ
れかつインバータの並び方向に沿う複数本の導体を有
し、前記各インバータは、前記取付板の導体に接触する
接触端子を有するものとした請求項１または請求項２記
載の太陽光発電用インバータの並列運転システム。3. A mounting plate to which said controller is mounted and said inverters are removably mounted in a line, said mounting plate comprising a plurality of conductors connected to said controller and extending along the direction in which said inverters are arranged. 3. The parallel operation system for an inverter for photovoltaic power generation according to claim 1, wherein each of the inverters has a contact terminal that contacts a conductor of the mounting plate. 4.
JP10333655A 1998-11-25 1998-11-25 Parallel operation system of solar-generating inverter Pending JP2000166097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10333655A JP2000166097A (en) 1998-11-25 1998-11-25 Parallel operation system of solar-generating inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10333655A JP2000166097A (en) 1998-11-25 1998-11-25 Parallel operation system of solar-generating inverter

Publications (1)

Publication Number Publication Date
JP2000166097A true JP2000166097A (en) 2000-06-16

Family

ID=18268496

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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JP2002171670A (en) * 2000-11-29 2002-06-14 Matsushita Electric Ind Co Ltd Power system interconnection inverter
EP1024575A3 (en) * 1999-01-28 2002-11-27 Canon Kabushiki Kaisha Photovoltaic power generation apparatus and control method thereof
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