JP3539455B2 - Power converter for photovoltaic power generation - Google Patents
Power converter for photovoltaic power generation Download PDFInfo
- Publication number
- JP3539455B2 JP3539455B2 JP21568495A JP21568495A JP3539455B2 JP 3539455 B2 JP3539455 B2 JP 3539455B2 JP 21568495 A JP21568495 A JP 21568495A JP 21568495 A JP21568495 A JP 21568495A JP 3539455 B2 JP3539455 B2 JP 3539455B2
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- Prior art keywords
- power
- solar cell
- output
- voltage
- phase
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- 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
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Description
【0001】
【産業上の利用分野】
本発明は、太陽電池の直流出力電力を単相3線式系統電源の交流電力に変換して出力する太陽光発電用電力変換装置に関する。
【0002】
【従来の技術】
従来、太陽電池の直流出力電力を単相3線式系統電源の交流電力に変換して出力する装置として、特開平5−111165号(図2)と特開平4−165963号(図3)に開示されるものがあった。
図2に示す装置は、IGBT9,10,11,12からなる単相出力のフルブリッジインバータの出力に大きな商用トランス13を接続し、太陽電池1の出力電力をコンデンサ8で平滑し、得られた直流電圧をフルブリッジインバータで交流に変換し、商用トランス13で単相2線式出力を単相3線式出力に変換して系統電源14に供給するものである。
一方、図3に示す装置は、2個の太陽電池1,2と、2個のコンデンサ3,4とIBGT9,10,11,12からなる2個のハーフブリッジインバータを用いて交流電力を得、系統電源14に供給するものである。
【0003】
【発明が解決しようとする課題】
太陽電池の出力電圧は、温度によって大きく変動する。また、太陽電池の種類によっては出力電圧が比較的低いものもある。ところが、トランスとインバータを使った前者の従来技術では、これらの太陽電池に対応する広範囲な入力電圧を持たせることが難しく、特定の太陽電池に専用のインバータとトランスを用意する必要があり、また、出力用のトランスが大きく重いためにインバータ本体も大きく重いものとなっていた。
また、ハーフブリッジインバータを2つ用いる後者の従来技術では、太陽電池も2つ必要となりそれぞれの太陽電池の独立に制御する制御回路等が必要であるため回路部品の点数が多く複雑になるという問題があった。
【0004】
本発明の目的は、出力に商用トランスが必要なく、太陽電池が1つで十分で、出力電圧がハーフブリッジインバータの必要な電圧に比べて低い太陽電池を使用できる太陽光発電用電力変換装置を提供することにある。
【0005】
【課題を解決するための手段】
上記目的を達成するためには、本発明の太陽光発電用電力変換装置は、太陽電池の出力電圧を昇圧する昇圧回路と、昇圧回路が昇圧した出力電圧を分圧する2つのコンデンサと、単相3線式の系統電源の電力へ変換する2つのハーフブリッジインバータを有し、前記コンデンサによって分圧された電圧の中電位点を前記単相3線式の系統電源の中性点に接続したものである。
請求項2の太陽光発電用電力変換装置では、昇圧回路は昇圧チョッパである。
【0006】
【作用】
昇圧回路が太陽電池の出力電圧を昇圧するのでハーフブリッジインバータの入力電圧を十分確保できるため、2つ必要であった太陽電池が1つで十分であり、したがって太陽電池を制御する制御回路が1つで済み、部品点数を減らし装置の小型化が可能となる。
また、太陽電池の出力電圧が低いものでも使用でき、ハーフブリッジインバータの入力電圧も安定化できる。
【0007】
【実施例】
次に、本発明の実施例について図面に基づいて説明する。
図1は本発明の一実施例の太陽光発電用電力変換装置の回路図である。
リアクトル5、IGBT6、ダイオード7は昇圧チョッパを構成し、コンデンサ3,4、IGBT9,10,11,12は単相3線式インバータ(2個のハーフブリッジインバータ)を構成している。太陽電池1から出力された電圧はコンデンサ8で平滑された後、まず昇圧チョッパでインバータの入力に必要な電圧まで昇圧される。この昇圧動作のため太陽電池1の出力電圧が低い場合でもインバータは動作可能となり、また、太陽電池1の定格出力電圧が比較的低いものでも使用可能となる。昇圧された電圧は直列接続された同じ容量のコンデンサ3および4で等分に分圧され、分圧された電圧の中電位点を単相3線式の中性線に接続する。コンデンサ3,4に蓄えられたエネルギーはハーフブリッジンンバータ2つで単相3線式の電力へ変換され、系統電源14へ供給される。
【0008】
【発明の効果】
以上説明したように、本発明は次のような効果がある。
(1)出力に商用トランスが必要ないので、装置を軽量化できる。
(2)太陽電池が1つでよいため、装置の小型化が可能となる。
(3)出力電圧がハーフブリッジインバータの必要な電圧に比べて低い太陽電池を使用できる。
(4)ハーフブリッジインバータの入力電圧を安定化できる。
【図面の簡単な説明】
【図1】本発明の一実施例の太陽光発電用電力変換装置の回路図である。
【図2】従来例の回路図である。
【図3】他の従来例の回路図である。
【符号の説明】
1,2 太陽電池
3,4,8 コンデンサ
5 リアクトル
6,9,10,11,12 IGBT
7 ダイオード
13 商用トランス
14 系統電源[0001]
[Industrial applications]
The present invention relates to a photovoltaic power converter that converts DC output power of a solar cell into AC power of a single-phase three-wire system power supply and outputs the AC power.
[0002]
[Prior art]
Conventionally, as a device for converting the DC output power of a solar cell into the AC power of a single-phase three-wire system power supply and outputting the same, see Japanese Patent Application Laid-Open Nos. 5-111165 (FIG. 2) and 4-1655963 (FIG. 3). Some were disclosed.
The device shown in FIG. 2 is obtained by connecting a large
On the other hand, the device shown in FIG. 3 obtains AC power using two
[0003]
[Problems to be solved by the invention]
The output voltage of a solar cell varies greatly with temperature. In addition, some types of solar cells have relatively low output voltages. However, in the former conventional technology using a transformer and an inverter, it is difficult to have a wide input voltage corresponding to these solar cells, and it is necessary to prepare a dedicated inverter and a transformer for a specific solar cell. However, since the output transformer was large and heavy, the inverter itself was also large and heavy.
Further, in the latter conventional technology using two half-bridge inverters, two solar cells are required, and a control circuit or the like for independently controlling each solar cell is required. was there.
[0004]
An object of the present invention is to provide a photovoltaic power conversion device that does not require a commercial transformer for output, requires only one solar cell, and can use a solar cell whose output voltage is lower than that required by a half-bridge inverter. To provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a power converter for photovoltaic power generation of the present invention comprises a booster circuit for boosting the output voltage of a solar cell, two capacitors for dividing the output voltage boosted by the booster circuit, and a single-phase Two half-bridge inverters for converting the power to the power of the three-wire system power supply, wherein the midpoint of the voltage divided by the capacitor is connected to the neutral point of the single-phase three-wire system power supply It is.
In the power converter for photovoltaic power generation according to claim 2, the booster circuit is a booster chopper.
[0006]
[Action]
Since the booster circuit boosts the output voltage of the solar cell, the input voltage of the half-bridge inverter can be sufficiently ensured. Therefore, one solar cell, which was required for two, is sufficient. Therefore, the control circuit for controlling the solar cell has one. And the number of parts can be reduced, and the size of the apparatus can be reduced.
In addition, a solar cell having a low output voltage can be used, and the input voltage of the half-bridge inverter can be stabilized.
[0007]
【Example】
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram of a power converter for photovoltaic power generation according to one embodiment of the present invention.
[0008]
【The invention's effect】
As described above, the present invention has the following effects.
(1) Since a commercial transformer is not required for output, the weight of the device can be reduced.
(2) Since only one solar cell is required, the size of the device can be reduced.
(3) A solar cell whose output voltage is lower than the required voltage of the half-bridge inverter can be used.
(4) The input voltage of the half-bridge inverter can be stabilized.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a photovoltaic power conversion device according to an embodiment of the present invention.
FIG. 2 is a circuit diagram of a conventional example.
FIG. 3 is a circuit diagram of another conventional example.
[Explanation of symbols]
1, 2, solar cell 3, 4, 8
7
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21568495A JP3539455B2 (en) | 1995-08-24 | 1995-08-24 | Power converter for photovoltaic power generation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21568495A JP3539455B2 (en) | 1995-08-24 | 1995-08-24 | Power converter for photovoltaic power generation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0965657A JPH0965657A (en) | 1997-03-07 |
JP3539455B2 true JP3539455B2 (en) | 2004-07-07 |
Family
ID=16676452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21568495A Expired - Lifetime JP3539455B2 (en) | 1995-08-24 | 1995-08-24 | Power converter for photovoltaic power generation |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10120595B4 (en) * | 2000-04-28 | 2004-08-05 | Sharp K.K. | Solar Energy System |
JP2006020470A (en) * | 2004-07-05 | 2006-01-19 | Honda Motor Co Ltd | Power unit |
JP2007336727A (en) * | 2006-06-16 | 2007-12-27 | Tokyo Electric Power Co Inc:The | Power converter |
JP5395394B2 (en) * | 2008-10-09 | 2014-01-22 | 本田技研工業株式会社 | Generator series connection device |
JP5126302B2 (en) * | 2010-06-30 | 2013-01-23 | 株式会社安川電機 | 3-level inverter, power conditioner and power generation system |
CN104882908B (en) * | 2015-05-25 | 2018-01-30 | 镇江市高等专科学校 | Intelligent micro-grid special inverter and control method |
EP3252937A1 (en) * | 2016-06-03 | 2017-12-06 | Fronius International GmbH | Inverter and method for operating an inverter |
-
1995
- 1995-08-24 JP JP21568495A patent/JP3539455B2/en not_active Expired - Lifetime
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Publication number | Publication date |
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JPH0965657A (en) | 1997-03-07 |
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