JP2002073184A - Photovoltaic power generation system - Google Patents
Photovoltaic power generation systemInfo
- Publication number
- JP2002073184A JP2002073184A JP2000264268A JP2000264268A JP2002073184A JP 2002073184 A JP2002073184 A JP 2002073184A JP 2000264268 A JP2000264268 A JP 2000264268A JP 2000264268 A JP2000264268 A JP 2000264268A JP 2002073184 A JP2002073184 A JP 2002073184A
- Authority
- JP
- Japan
- Prior art keywords
- power generation
- inverter
- solar cell
- unit
- cell power
- 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.)
- Granted
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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、太陽光発電システ
ムに関し、詳しくは、日射量が低下した場合において
も、システム全体として効率良く発電する太陽光発電シ
ステムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power generation system, and more particularly to a photovoltaic power generation system capable of efficiently generating power as a whole even when the amount of solar radiation is reduced.
【０００２】[0002]
【従来の技術】従来からの太陽光発電システムには、太
陽電池パネルを直列に接続してなる太陽電池発電部があ
り、これがインバータと接続して構成される太陽光発電
ユニットがある。そして、この太陽光発電ユニットが複
数並列に接続されて、例えば電力系統に連系されている
ものがある。以下、このシステム構造をストリングイン
バータ方式と呼ぶことにする。2. Description of the Related Art A conventional photovoltaic power generation system includes a photovoltaic power generation unit formed by connecting solar cell panels in series, and a photovoltaic power generation unit configured by connecting the solar cell panel to an inverter. Then, there is a plurality of solar power generation units connected in parallel, for example, connected to an electric power system. Hereinafter, this system structure is referred to as a string inverter system.
【０００３】しかし、この方式では各インバータに制御
装置を備える必要があるため、この制御装置による電力
損失（固定損失）が増加するという問題を有している。
特に日射量が減少し、低い発電電力で運転を行っている
場合は電力損失の影響により効率が大幅に低下してしま
う。However, in this method, since it is necessary to provide a control device for each inverter, there is a problem that power loss (fixed loss) due to the control device increases.
In particular, when the amount of solar radiation is reduced and the operation is performed with low generated power, the efficiency is greatly reduced due to the influence of the power loss.
【０００４】また、特開平１０−６９３２１号記載の太
陽光発電システムでは、基本的に太陽電池発電部とイン
バータが１：１対応で接続されているストリングインバ
ータ方式で構成されているのだが、太陽光発電ユニット
をいくつかまとめて組み分けし、その各組ごとに切り換
え装置が設けられている。そして、その組内において、
予め定められた主となるインバータにいくつかの太陽電
池発電部の発電電力が集中するような構造となってい
る。The solar power generation system described in Japanese Patent Application Laid-Open No. H10-69321 is basically configured by a string inverter system in which a solar cell power generation unit and an inverter are connected in a 1: 1 correspondence. Several photovoltaic units are grouped together and a switching device is provided for each group. And within that group,
The structure is such that the power generated by several solar cell power generation units concentrates on a predetermined main inverter.
【０００５】そして、通常、太陽電池発電部に照射され
る日射量が充分である時には、各太陽光発電ユニット内
において、太陽電池発電部とインバータを１：１対応で
接続する。また、日射量の減少時には、予め組み分けさ
れたいくつかの太陽光発電ユニットにおいて、そのそれ
ぞれが有している各太陽電池発電部からの発電電力が集
中するような主となるインバータを予め定めておく。そ
して、いくつかの切り換え装置をスイッチングすること
によって、主インバータに発電電力を集中させていくと
ともに、主インバータでの電力変換を高効率で行えるよ
うにしている。[0005] Normally, when the amount of solar radiation irradiated to the solar cell power generation unit is sufficient, the solar cell power generation unit and the inverter are connected in a one-to-one correspondence in each solar power generation unit. In addition, when the amount of solar radiation decreases, in some of the photovoltaic power generation units that have been pre-combined, a main inverter in which power generated from each of the solar cell power generation units of each of the photovoltaic power generation units is concentrated is determined in advance. Keep it. By switching some switching devices, the generated power is concentrated on the main inverter, and the power conversion in the main inverter can be performed with high efficiency.
【０００６】[0006]
【発明が解決しようとする課題】ところが、上記従来例
にあって、予め定めらている主インバータが故障等の原
因で動作しなくなった場合には、日射量が減少した時に
おいても、各太陽光発電ユニットにおいて太陽電池発電
部とインバータを１：１対応で接続して個別運転しなけ
ればならず、個々のインバータによる電力損失の影響が
大きくなり、発電効率が著しく低下してしまう。However, in the above-mentioned conventional example, when the predetermined main inverter stops operating due to a failure or the like, even when the amount of solar radiation is reduced, each of the solar cells cannot be operated. In the photovoltaic power generation unit, the solar cell power generation unit and the inverter must be connected in a one-to-one correspondence to operate individually, and the effect of power loss by each inverter increases, and the power generation efficiency is significantly reduced.
【０００７】本発明は、上記事由に鑑みて為されたもの
であり、日射量の違いやインバータの故障等に応じて自
由にいくつかの稼動するインバータを選択し、そのイン
バータに最もシステム全体の効率がよくなるように発電
電力を集中させることができる太陽光発電システムを提
供するものである。The present invention has been made in view of the above circumstances, and freely selects several operating inverters in response to a difference in the amount of solar radiation, a failure of the inverter, and the like. An object of the present invention is to provide a solar power generation system capable of concentrating generated power so that efficiency is improved.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に請求項１記載の太陽光発電システムは、複数の太陽電
池パネルを直列接続してなる太陽電池発電部と、この太
陽電池発電部からの出力電力を交流に変換するインバー
タとで構成される太陽電池発電ユニットを複数並列に接
続して備えるとともに、複数の太陽電池発電ユニット内
にあるインバータのうちから選択された稼動インバータ
に、これと同一ユニット内にある太陽電池発電部を接続
し、かつ、そのとき選択されなかった非稼動インバータ
から、これと同一ユニット内にある太陽電池発電部を切
断して、この切断された太陽電池発電部を前記稼動イン
バータのうちいずれかに接続するようにスイッチングを
行う接続変換部を備えたことを特徴とするものである。According to a first aspect of the present invention, there is provided a photovoltaic power generation system comprising a plurality of solar cell panels connected in series; A plurality of photovoltaic power generation units each comprising an inverter that converts the output power of the photovoltaic power into an alternating current are connected in parallel, and the operating inverter selected from the inverters in the plurality of photovoltaic power generation units is The solar cell power generation unit in the same unit is connected, and the solar cell power generation unit in the same unit as this is disconnected from the non-operating inverter not selected at that time. And a connection conversion unit that performs switching so as to be connected to any of the operating inverters.
【０００９】また、請求項２記載の太陽光発電システム
は、複数の太陽電池発電ユニット内にあるインバータの
発電データをそれぞれ検出し、これら発電データに基づ
いて前記稼動インバータを選択し、前記接続変換部にお
けるスイッチングを制御する制御部を設けたことを特徴
とするものである。Further, the photovoltaic power generation system according to claim 2 detects power generation data of inverters in a plurality of solar cell power generation units, respectively, selects the operating inverter based on the power generation data, and performs the connection conversion. A control unit for controlling switching in the unit is provided.
【００１０】さらに、請求項３記載の太陽光発電システ
ムは、請求項２記載の太陽光発電システムにおいて、前
記制御部に、複数の太陽電池発電ユニット内にある太陽
電池発電部を構成するいずれかの太陽電池パネルからそ
れぞれ開放電圧を測定して、前記非稼動インバータとこ
れと同一ユニット内にある太陽電池発電部とを再接続し
て得られるこのインバータからの発電電力を予測し、こ
の発電電力に基づいて再接続するかどうかの判断をする
制御機能を持たせたことを特徴とするものである。Further, in the photovoltaic power generation system according to a third aspect, in the photovoltaic power generation system according to the second aspect, any one of the control units includes a photovoltaic power generation unit in a plurality of photovoltaic power generation units. The open-circuit voltage is measured from each of the solar cell panels, and the generated power from the inverter obtained by reconnecting the non-operating inverter and the solar cell power generation unit in the same unit is predicted. And a control function for determining whether or not to reconnect based on the control function.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施形態について
説明する。図１は、本発明の第１実施形態に係る太陽光
発電システムの回路構成図である。Embodiments of the present invention will be described below. FIG. 1 is a circuit configuration diagram of the photovoltaic power generation system according to the first embodiment of the present invention.
【００１２】この第１実施形態の太陽光発電システム
は、複数個の太陽電池モジュールからなる太陽電池パネ
ル１を複数直列に接続してなる太陽電池発電部２と、こ
の太陽電池発電部２から出力される直流電力を供給する
主電路３と、この主電路３を介して供給された太陽電池
発電部２からの直流電力を交流電力に変換するインバー
タ４とで構成された太陽光発電ユニット５を備えてい
る。そして、複数台の太陽光発電ユニット５が並列に接
続されて、商用電源６に連系されている。The solar power generation system according to the first embodiment includes a solar cell power generation unit 2 in which a plurality of solar cell panels 1 each including a plurality of solar cell modules are connected in series, and an output from the solar cell power generation unit 2. A solar power generation unit 5 including a main electric circuit 3 for supplying DC power to be supplied and an inverter 4 for converting DC electric power supplied from the solar cell power generation unit 2 through the main electric circuit 3 into AC electric power. Have. A plurality of photovoltaic power generation units 5 are connected in parallel and connected to a commercial power supply 6.
【００１３】ここで、太陽光発電ユニット５を区別する
ために、図１のように左の方から順番にａ、ｂ、ｃと
し、太陽光発電ユニット５ａを構成するものにはａを、
５ｂを構成するものにはｂを、５ｃを構成するものには
ｃを付することにする。（以下、同様にして説明す
る。） この実施形態において、インバータ４は直流電力を交流
電力に変換する電力変換機能とともに、商用電源６の周
波数変動や電圧変動、あるいは停電等を検出して、イン
バータ４と商用電源６を切断する系統連系保護機能を有
している。また、インバータ４は主電路３により接続さ
れる太陽電池発電部２の最大電力を出力可能なように、
各太陽光発電ユニットにおいて個別に最大点出力制御を
行う。すなわち、インバータ４ａは太陽電池発電部２ａ
に対して最大点出力制御を行うようになっている。Here, in order to distinguish the photovoltaic power generation units 5, as shown in FIG. 1, a, b, and c are set in order from the left, and a is used for the components constituting the photovoltaic power generation unit 5a.
The component constituting 5b is denoted by b, and the component configuring 5c is denoted by c. In the present embodiment, the inverter 4 detects a frequency fluctuation and a voltage fluctuation of the commercial power supply 6 or a power failure, and performs an inverter operation together with a power conversion function of converting DC power into AC power. 4 and a system interconnection protection function for disconnecting the commercial power supply 6. In addition, the inverter 4 can output the maximum power of the solar cell power generation unit 2 connected by the main electric circuit 3,
The maximum point output control is individually performed in each solar power generation unit. That is, the inverter 4a is connected to the solar cell power generation unit 2a.
, The maximum point output control is performed.
【００１４】また、この太陽光発電システムは、太陽電
池発電部２とインバータ４との間の配線を変更する接続
変換部７を備えている。この接続変換部７は、各太陽光
発電ユニットの主電路間を接続している分岐電路８と、
主電路３に設けられた直流開閉器９および分岐電路８に
設けられた直流開閉器１０から構成されている。本実施
形態では、この直流開閉器９および１０はインバータ４
に内蔵された構造になっている。ただし本発明では、こ
の直流開閉器９および１０はインバータ４の外部に設け
られていてもよい。Further, the solar power generation system includes a connection conversion unit 7 for changing a wiring between the solar cell power generation unit 2 and the inverter 4. This connection conversion unit 7 includes a branch electric circuit 8 connecting between main electric circuits of the respective photovoltaic power generation units,
It comprises a DC switch 9 provided on the main circuit 3 and a DC switch 10 provided on the branch circuit 8. In the present embodiment, the DC switches 9 and 10 are connected to the inverter 4
It has a built-in structure. However, in the present invention, DC switches 9 and 10 may be provided outside inverter 4.
【００１５】本太陽光発電システムの動作について説明
する。通常、各太陽電池発電部に照射される日射量が充
分である時には、各インバータ４ａ、４ｂ、４ｃは各太
陽光発電ユニット内において直流開閉器９ａ、９ｂ、９
ｃを閉じ、各太陽電池発電部と１：１対応で接続して個
別に発電を行っている。The operation of the solar power generation system will be described. Normally, when the amount of solar radiation applied to each solar cell power generation unit is sufficient, each inverter 4a, 4b, 4c is connected to a DC switch 9a, 9b, 9 in each solar power generation unit.
c is closed and connected to each solar cell power generation unit in a 1: 1 correspondence to individually generate power.
【００１６】次に、太陽電池発電部２の設置場所や設置
方向の違いにより、１日の太陽の動きによる影響を受け
て日射量に違いが生じ、あるインバータの効率が低下し
た場合について説明する。例えば、太陽電池発電部２ａ
の日射量が減少し発電電力が小さくなったとすると、そ
れに応じてインバータ４ａは電力損失の影響を受けやす
くなり、効率が悪くなる。そして、このインバータ４ａ
においてある程度効率が下がると、自動的に直流開閉器
９ａを開放して発電を停止し、かわりに直流開閉器１０
ａを閉じるのである。図１において、インバータ４ａの
直流開閉器９ａを開放し、直流開閉器１０ａを閉じると
太陽電池発電部２ａは、インバータ４ｃに接続される。
このとき、インバータ４ｃには太陽電池発電部２ａと太
陽電池発電部２ｃが接続されることになり入力電力が増
加する。このように、効率が下がったインバータの動作
を停止し、これによって切り離された太陽電池発電部の
発電電力を別のインバータに集中させることによって、
効率が下がったインバータによる電力損失の影響を受け
にくくし、システム全体として発電効率を上げるように
なっている。このシステム構成によって、住宅等の屋根
に取り付ける場合における、一部の太陽電池発電部の日
射量が減少したときにおいても、効率の良い発電が可能
となる。Next, a case will be described in which the amount of solar radiation is affected by the movement of the sun every day due to the difference in the installation location and installation direction of the solar cell power generation unit 2, and the efficiency of a certain inverter is reduced. . For example, the solar cell power generation unit 2a
If the amount of solar radiation decreases and the generated power decreases, the inverter 4a becomes susceptible to the power loss and the efficiency decreases accordingly. And this inverter 4a
When the efficiency decreases to some extent, the DC switch 9a is automatically opened to stop the power generation, and the DC switch 10
Close a. In FIG. 1, when the DC switch 9a of the inverter 4a is opened and the DC switch 10a is closed, the solar cell power generation unit 2a is connected to the inverter 4c.
At this time, the solar cell power generation unit 2a and the solar cell power generation unit 2c are connected to the inverter 4c, and the input power increases. In this way, by stopping the operation of the inverter with reduced efficiency and concentrating the power generated by the separated solar cell power generation unit to another inverter,
Inverters with reduced efficiency are less susceptible to power loss, and the power generation efficiency of the entire system is increased. With this system configuration, efficient power generation is possible even when the amount of solar radiation of some of the solar cell power generation units decreases when the solar cell power generation unit is attached to a roof of a house or the like.
【００１７】また、曇りの日や夕方などのように一様に
日射量が減少し、各インバータ４ａ、４ｂ、４ｃともに
低効率領域で動作している場合ついて説明する。図１に
示すように、太陽光発電ユニット５ａ、５ｂ内におい
て、太陽電池発電部２ａ、２ｂとインバータ４ａ、４ｂ
を、直流開閉器９ａ、９ｂを開放することによって切り
離すと同時に、直流開閉器１０ａ、１０ｂを閉じる。こ
のようにして、切り離された太陽電池発電部２ａ、２ｂ
の発電電力はインバータ４ｃに集中することになり、イ
ンバータ１台あたりの入力電力が増加して効率を上げて
いるのである。A case will be described in which the amount of solar radiation decreases uniformly, such as on a cloudy day or in the evening, and each of the inverters 4a, 4b, and 4c operates in a low efficiency region. As shown in FIG. 1, in the solar power generation units 5a and 5b, the solar cell power generation units 2a and 2b and the inverters 4a and 4b
Is disconnected by opening the DC switches 9a and 9b, and at the same time, the DC switches 10a and 10b are closed. Thus, the separated solar cell power generation units 2a, 2b
Is concentrated on the inverter 4c, and the input power per inverter is increased to improve the efficiency.
【００１８】次に、本発明の第２実施形態について、図
２を参照して説明する。この太陽光発電システムは、接
続変換部７の制御を行う制御部１１を別途設け、かつ直
流開閉器９および１０をインバータ４の外部に設けた構
成となっている点において、上記第１実施形態と異なっ
ている。Next, a second embodiment of the present invention will be described with reference to FIG. This solar power generation system has a configuration in which a control unit 11 for controlling the connection conversion unit 7 is separately provided and DC switches 9 and 10 are provided outside the inverter 4 in the first embodiment. Is different.
【００１９】この太陽光発電システムの動作について、
上記した太陽電池発電部２の設置場所や設置方向の違い
により、各太陽電池発電部における日射量に違いが生じ
た場合について説明する。例えば、太陽電池発電部２ａ
の日射量が減少したとすると、制御部１１は各太陽電池
発電ユニット内にある各インバータの発電データ（電
圧、電流、電力）をそれぞれ検出し、太陽電池発電部２
ａの発電電力が低下していることを検知する。そして、
制御部１１は稼動インバータ（日射量減少時に動作する
インバータ）を自由に選択することができる。図１にお
いて、稼動インバータを４ｂ、４ｃの２つに選択したと
すると、制御部１１はそのときに選択されなかった非稼
動インバータ４ａの直流開閉器９ａを開放して太陽電池
発電部２ａを切り離し、直流開閉器１０ａを閉じて太陽
電池発電部２ａの発電電力をインバータ４ｃに集めてい
る。このとき、選択された稼動インバータ４ｂ、４ｃ
は、それぞれの太陽光発電ユニット５ｂ、５ｃ内にある
太陽電池発電部２ｂ、２ｃと、直流開閉器９ｂ、９ｃを
介して接続されている。このように、一部の太陽電池発
電部の日射量が減少した場合において、制御部１１は動
作するインバータ数を減少させ、動作を継続するインバ
ータの太陽電池発電部の並列数を増加させるように、接
続変換部７が有する直流開閉器９および１０のスイッチ
ングを制御しているのである。Regarding the operation of this solar power generation system,
A case in which the amount of solar radiation in each solar cell power generation unit differs due to the difference in the installation location and installation direction of the solar cell power generation unit 2 will be described. For example, the solar cell power generation unit 2a
Assuming that the amount of solar radiation has decreased, the control unit 11 detects the power generation data (voltage, current, power) of each inverter in each solar cell power generation unit, and
It is detected that the generated power of a has dropped. And
The control unit 11 can freely select an operating inverter (an inverter that operates when the amount of solar radiation decreases). In FIG. 1, assuming that the operating inverter is selected to be two of 4b and 4c, the control unit 11 opens the DC switch 9a of the non-operating inverter 4a which is not selected at that time to disconnect the solar cell power generation unit 2a. The DC switch 10a is closed, and the power generated by the solar cell power generation unit 2a is collected by the inverter 4c. At this time, the selected operating inverters 4b, 4c
Are connected to solar cell power generation units 2b, 2c in the respective solar power generation units 5b, 5c via DC switches 9b, 9c. As described above, when the amount of solar radiation of some of the solar cell power generation units decreases, the control unit 11 reduces the number of operating inverters and increases the number of parallel solar cell power generation units of the inverters that continue to operate. That is, the switching of the DC switches 9 and 10 of the connection converter 7 is controlled.
【００２０】なお、何らかの原因でインバータ４のいず
れかが故障し動作しなくなった場合においても、制御部
１１は、その故障したインバータに接続されている太陽
電池発電部の発電電力を他の正常なインバータに集中さ
せるように、接続変換部７が有する直流開閉器９および
１０を制御する。Even if one of the inverters 4 fails for some reason and stops operating, the control unit 11 uses the power generated by the solar cell power generation unit connected to the failed inverter to another normal power source. The DC switches 9 and 10 of the connection converter 7 are controlled so as to concentrate on the inverter.
【００２１】また、曇りの日や夕方など一様に日射量が
減少した場合に、例えば図１において、制御部１１は各
太陽電池発電ユニット内にある各インバータの発電デー
タより、稼動インバータをインバータ４ｃに選択したと
すると、直流開閉器９ａ、９ｂを開放し、直流開閉器１
０ａ、１０ｂ閉じて稼動インバータ４ｃの入力電力が増
加するように制御する。When the amount of solar radiation is uniformly reduced, such as on a cloudy day or in the evening, for example, in FIG. 1, the control unit 11 determines the operating inverter based on the power generation data of each inverter in each solar cell power generation unit. 4c, the DC switches 9a and 9b are opened, and the DC switches 1a and 9b are opened.
Control is performed so that the input power of the operation inverter 4c is increased by closing 0a and 10b.
【００２２】さらに、本実施形態において、稼動インバ
ータのうちいずれかに入力電力が集中して発電している
システムを、各太陽光発電ユニットにおいて、太陽電池
発電部２とインバータ４がもとの１：１対応で接続して
個別に発電を行うシステムに戻すときの動作について説
明する。日射量が減少し、１台のインバータに複数の太
陽電池発電部が並列接続されている状態、例えば図１に
おいて、太陽電池発電部２ａ、２ｂの発電電力がインバ
ータ４ａに集中して発電しているとする。このとき、制
御部１１は、各太陽電池発電部２ａ、２ｂを構成するい
ずれかの太陽電池パネルから、それぞれ開放電圧を測定
し、その開放電圧からインバータ４ｂを再び動作させ
て、各太陽光発電ユニット５ａ、５ｂを個別に運転した
場合に予測される各インバータ４ａ、４ｂの発電電力を
演算により求めるのである。そして、太陽電池発電部２
ａと太陽電池発電部２ｂが並列接続され、インバータ４
ａが動作している状態において、 ｐ１＋ｐ２＞Ｐ１ ｐ１：開放電圧から予測される個別運転した時のインバ
ータ１ａの発電電力 ｐ２：開放電圧から予測される個別運転した時のインバ
ータ１ｂの発電電力 Ｐ１：集中運転を行うインバータ１ａの発電電力 である場合、太陽電池発電部２ｂをインバータ４ａから
切り離し、個別運転にシフトする。このように、集中運
転時と個別運転時の発電電力を比較しながら接続変換部
を制御することができるため、太陽電池発電部に雲がか
かった場合のような一時的な日射量の減少により、太陽
電池発電部が並列に接続されたときにでも、最も効率の
良いタイミングで集中運転から個別運転へ移行させるこ
とができるのである。Further, in this embodiment, a system in which input power is concentrated and generated in one of the operating inverters is connected to a solar cell power generation unit 2 and an inverter 4 in each solar power generation unit. The operation when returning to a system that generates power individually by connecting them in a 1: 1 correspondence will be described. In a state where the amount of solar radiation is reduced and a plurality of solar cell power generation units are connected in parallel to one inverter, for example, in FIG. 1, the power generated by the solar cell power generation units 2a and 2b is concentrated and generated by the inverter 4a. Suppose you have At this time, the control unit 11 measures an open voltage from one of the solar cell panels constituting each of the solar cell power generation units 2a and 2b, operates the inverter 4b again from the open voltage, and outputs The power generation of each inverter 4a, 4b predicted when the units 5a, 5b are individually operated is calculated. And the solar cell power generation unit 2
a and the solar cell power generation unit 2b are connected in parallel, and the inverter 4
In the state where a is operating, p1 + p2> P1 p1: generated power of the inverter 1a during individual operation predicted from the open circuit voltage p2: generated power of the inverter 1b during individual operation predicted from the open circuit voltage P1: If the power is generated by the inverter 1a that performs the centralized operation, the solar cell power generation unit 2b is disconnected from the inverter 4a, and the operation is shifted to the individual operation. In this way, since the connection conversion unit can be controlled while comparing the generated power during the centralized operation and the individual operation, the temporary decrease in the amount of solar radiation, such as when a cloud covers the solar cell power generation unit, Even when the solar cell power generation units are connected in parallel, it is possible to shift from the centralized operation to the individual operation at the most efficient timing.
【００２３】[0023]
【発明の効果】以上、説明したように、請求項１記載の
太陽光発電システムでは、少数のインバータに太陽電池
発電部の出力を集中させることにより、インバータが高
効率領域で動作できるため、システム全体として効率の
向上が図れる。As described above, in the solar power generation system according to the first aspect, since the output of the solar cell power generation unit is concentrated on a small number of inverters, the inverter can operate in a high efficiency region. The efficiency can be improved as a whole.
【００２４】請求項２記載の太陽光発電システムでは、
制御部がシステム全体の発電状況を監視しながら、太陽
電池発電部とインバータの組み合わせを決定し、接続変
換部のスイッチングを制御するため、精度良く、効率的
なシステム動作が可能となる。In the solar power generation system according to the second aspect,
Since the control unit determines the combination of the solar cell power generation unit and the inverter and controls the switching of the connection conversion unit while monitoring the power generation status of the entire system, accurate and efficient system operation is possible.
【００２５】請求項３記載の太陽光発電システムでは、
集中運転時と個別運転時の発電電力を比較しながら接続
変換部を制御することができるため、最も効率の良いタ
イミングで集中運転から個別運転へ移行させることがで
きる。In the solar power generation system according to the third aspect,
Since the connection converter can be controlled while comparing the generated power during the centralized operation and the individual operation, it is possible to shift from the centralized operation to the individual operation at the most efficient timing.
【図１】本発明の第１実施形態に係る太陽光発電システ
ムの回路構成図である。FIG. 1 is a circuit configuration diagram of a photovoltaic power generation system according to a first embodiment of the present invention.
【図２】本発明の第２実施形態に係る太陽光発電システ
ムの構成図である。FIG. 2 is a configuration diagram of a photovoltaic power generation system according to a second embodiment of the present invention.
１ 太陽電池パネル ２ 太陽電池発電部 ４ インバータ ５ 太陽光発電ユニット ７ 接続変換部 １１ 制御部 REFERENCE SIGNS LIST 1 solar cell panel 2 solar cell power generation unit 4 inverter 5 solar power generation unit 7 connection conversion unit 11 control unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡本 信一郎 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 東浜 弘忠 大阪府門真市大字門真1048番地松下電工株 式会社内 Ｆターム(参考） 5F051 BA11 KA01 KA03 KA10 5G066 HA01 HB03 HB06 5H420 BB03 BB14 CC03 CC06 DD03 EA48 EB13 EB39 FF03 FF22 GG01 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shinichiro Okamoto 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. F term (reference) 5F051 BA11 KA01 KA03 KA10 5G066 HA01 HB03 HB06 5H420 BB03 BB14 CC03 CC06 DD03 EA48 EB13 EB39 FF03 FF22 GG01
Claims (3)
る太陽電池発電部と、この太陽電池発電部からの出力電
力を交流に変換するインバータとで構成される太陽電池
発電ユニットを複数並列に接続して備えるとともに、複
数の太陽電池発電ユニット内にあるインバータのうちか
ら選択された稼動インバータに、これと同一ユニット内
にある太陽電池発電部を接続し、かつ、そのとき選択さ
れなかった非稼動インバータから、これと同一ユニット
内にある太陽電池発電部を切断して、この切断された太
陽電池発電部を前記稼動インバータのうちいずれかに接
続するようにスイッチングを行う接続変換部を備えたこ
とを特徴とする太陽光発電システム。1. A plurality of solar cell power generation units each comprising a solar cell power generation unit formed by connecting a plurality of solar cell panels in series, and an inverter that converts output power from the solar cell power generation unit into an alternating current. Connected and provided, and connected to the operating inverter selected from the inverters in the plurality of solar cell power generation units, the solar cell power generation unit in the same unit as the operating inverter, and the non-selected non-selected at that time. A connection conversion unit that performs switching so as to disconnect the solar cell power generation unit in the same unit as the operation inverter from the operation inverter and connect the disconnected solar cell power generation unit to any of the operation inverters. A photovoltaic power generation system characterized in that:
ンバータの発電データをそれぞれ検出し、これら発電デ
ータに基づいて前記稼動インバータを選択し、前記接続
変換部におけるスイッチングを制御する制御部を設けた
ことを特徴とする請求項１記載の太陽光発電システム。2. A control unit for detecting power generation data of inverters in a plurality of solar cell power generation units, selecting the operating inverter based on the power generation data, and controlling switching in the connection conversion unit. The photovoltaic power generation system according to claim 1, wherein:
ット内にある太陽電池発電部を構成するいずれかの太陽
電池パネルからそれぞれ開放電圧を測定して、前記非稼
動インバータとこれと同一ユニット内にある太陽電池発
電部とを再接続して得られるこのインバータからの発電
電力を予測し、この発電電力に基づいて再接続するかど
うかの判断をすることを特徴とする請求項２記載の太陽
光発電システム。3. The control unit measures an open circuit voltage from any one of the solar cell panels constituting the solar cell power generation units in the plurality of solar cell power generation units, and controls the inactive inverter and the same unit as the inactive inverter. The power generation from the inverter obtained by reconnecting the photovoltaic power generation unit within the inverter is predicted, and it is determined whether to reconnect based on the generated power. Solar power system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000264268A JP3656531B2 (en) | 2000-08-31 | 2000-08-31 | Solar power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000264268A JP3656531B2 (en) | 2000-08-31 | 2000-08-31 | Solar power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002073184A true JP2002073184A (en) | 2002-03-12 |
| JP3656531B2 JP3656531B2 (en) | 2005-06-08 |
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|---|---|---|---|
| JP2000264268A Expired - Lifetime JP3656531B2 (en) | 2000-08-31 | 2000-08-31 | Solar power system |
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| Country | Link |
|---|---|
| JP (1) | JP3656531B2 (en) |
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