JPH0635555A - 太陽電池の最大電力点追跡制御法 - Google Patents
太陽電池の最大電力点追跡制御法Info
- Publication number
- JPH0635555A JPH0635555A JP4213515A JP21351592A JPH0635555A JP H0635555 A JPH0635555 A JP H0635555A JP 4213515 A JP4213515 A JP 4213515A JP 21351592 A JP21351592 A JP 21351592A JP H0635555 A JPH0635555 A JP H0635555A
- Authority
- JP
- Japan
- Prior art keywords
- operating voltage
- change
- maximum power
- point
- 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
Landscapes
- Photovoltaic Devices (AREA)
- Control Of Electrical Variables (AREA)
Abstract
ら離れていくようなことのない太陽電池の最大電力点追
跡制御法を提供する。 【構成】 太陽電池の発電電力を計測し、計測値が最大
になるように太陽電池の動作電圧を制御する、太陽電池
の最大電力点追跡制御法において、動作電圧を変化させ
る前の電力計測値W1 、変化させた後の電力計測値W2
、および再度変化前の動作電圧に戻した時の電力計測
値W3 をメモリして各々比較し、W1 <W2 でかつW2
<W3 、またはW1 >W2 でかつW2 >W3 の時には変
化前の動作電圧を維持する。
Description
跡制御法に関するものである。
跡制御法を図3を用いて説明する。図3に太陽電池の動
作電圧と発電電力の特性を示す、最初動作電圧がB点で
あったとする。つぎに動作電圧をA点に変化させたとす
ると、太陽電池の発電電力は日射量小の場合図3のB1
からA1 へと増加するので最大電力点の方向に近付いて
いると判断し、さらに動作電圧をC点へと変化させ、最
大電力点追跡をする。
ぎに動作電圧をB点に変化させると発電電力がA1 から
B1 に減少するので最大電力点から離れたと判断し、も
う一度動作電圧をA点に戻すという制御がとられてい
た。
作電圧を変化させ、変化前の太陽電池の発電電力と、変
化後の発電電力を比較し、電力が増えているならば同じ
方向に、電力が減少しているなら逆の方向へ動作電圧を
変化させることにより動作電圧が最大電力点に近付くよ
うに制御している。図4に上記従来技術の動作のフロー
チャートを示す。
ている時は以上のように良好に動作するが、日射量が変
化している時には以下のような動作が起こる。
作電圧がA点であったとし、その時の発電電力がA1 だ
ったとする。次に動作電圧をB点に変化させたときに日
射量が増え発電電力がB1 からB2 に増加したとする。
この時には動作電圧が最大電力点から離れて行く方向で
あるにも関わらず発電電力が増加するので、最大電力点
に近付いたと判断し動作電圧をより低い動作電圧へ変化
させる。しかしこれでは動作電圧は最大電力点から離れ
ていくことになる。
御法は以上のように、動作電圧を変化させたために発電
電力が変化したのか、日射量が変化しために発電電力が
変化したのか判断がつかず、日射量が変化している時に
太陽電池の動作電圧が最大電力点から離れていくという
欠点がある。
の従来の制御法の欠点を補うために、動作電圧を変化さ
せたために発電電力が変化したのか、日射量が変化した
ために発電電力が変化したかを判定し、日射量が変動し
ている時には最大電力点追跡制御を行わず、日射量が安
定しているときにのみ最大電力点追跡制御を行うように
したもので、動作電圧を変化させる前の計測値W1 、変
化させた後の計測値W2 、および再度変化前の動作電圧
に戻した時の計測値W3 をメモリして各々比較し、W1
<W2 でかつW2 <W3 、またはW1 >W2 でかつW2
>W3 の時には変化前の動作電圧を維持することを特徴
としたものである。
図1に示す。図において1は太陽電池、2は太陽電池の
電力を変換する変換装置、3は変換装置に太陽電池の動
作電圧を指令する制御回路、4は太陽電池の発電電力を
計測する計測器、5は計測した発電電力をメモリする装
置、6は最大電力点追跡制御装置の全体、そして7は変
換出力である。
圧がA点であった時に発電電力の計測値がW1 であった
とし、これをメモリする。次に動作電圧がB点になるよ
うに変化させた後に発電電力の計測値がW2 になったと
しこれをメモリする。つぎにもう一度動作電圧がA点に
戻るように変化させた後の発電電力の計測値がW3 にで
あったとして、これをメモリする。
きには動作点をA点からB点に変化させた時には発電電
力はA1 からB1 へ変化するのでW1 >W2 となり減少
し、動作点をB点からA点に変化させた時には発電電力
はB1 からA1 に変化し、W2 <W3 となり増加するは
ずである。もしそのように発電電力が変化すれば、A点
のほうがB点より最大電力点に近いと判断し、動作電圧
をC点に移す。
時に日射量が増え太陽電池の発電電力W2 がB1 からB
2 に増加した時はA1 からB2 に変化することになり、
W1<W2 となる。そして次に動作電圧をB点からA点
に変化させた時にも発電電力がW2 <W3 となり増加す
る。このように動作電圧を変化させた時と元に戻した時
ともに太陽電池の出力が増加または減少した時つまりW
1 <W2 かつW2 <W3 、またはW1 >W2 かつW2 >
W3 の時には、その発電電力の変化は動作電圧の変化に
よりもたらされたものではなく、日射量が変化したこと
によるものと推測し、動作電圧を変化前の値に維持す
る。
ためのフローチャートであり、計測値W1 W2 W3 の変
化に対応したすべての動作を示すものである。
の変化は、太陽電池電圧100Vに対して0.5Vとわ
ずかであり、また、一連の動作電圧変化の繰り返し周期
は約1.5秒としている。
動していたと判断した場合には、上記のW3 を次のサイ
クルのW1 とし、動作電圧を維持することを省略して、
次の追跡動作に移行することができる。
作電圧を変化させたことにより発電電力が変化したの
か、日射量が変化したことにより発電電力が変化したの
かを判断し、日射量が変化したときに最大電力点追跡制
御を行わず、動作電圧が最大電力点から大きく離れてい
くことを防止できるという効果がある。
ック図
を示した図
Claims (1)
- 【請求項1】 太陽電池の発電電力を計測し、計測値が
最大になるように太陽電池の動作電圧を制御する、太陽
電池の最大電力点追跡制御法において、 動作電圧を変化させる前の電力計測値W1 、変化させた
後の電力計測値W2 、および再度変化前の動作電圧に戻
した時の電力計測値W3 をメモリして各々比較し、 W1 <W2 でかつW2 <W3 、またはW1 >W2 でかつ
W2 >W3 の時には変化前の動作電圧を維持することを
特徴とする太陽電池の最大電力点追跡制御法。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21351592A JP3318974B2 (ja) | 1992-07-16 | 1992-07-16 | 太陽電池の最大電力点追跡制御法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21351592A JP3318974B2 (ja) | 1992-07-16 | 1992-07-16 | 太陽電池の最大電力点追跡制御法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0635555A true JPH0635555A (ja) | 1994-02-10 |
JP3318974B2 JP3318974B2 (ja) | 2002-08-26 |
Family
ID=16640471
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21351592A Expired - Fee Related JP3318974B2 (ja) | 1992-07-16 | 1992-07-16 | 太陽電池の最大電力点追跡制御法 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3318974B2 (ja) |
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-
1992
- 1992-07-16 JP JP21351592A patent/JP3318974B2/ja not_active Expired - Fee Related
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