JPH096445A - Maximum power control method for solar battery - Google Patents
Maximum power control method for solar batteryInfo
- Publication number
- JPH096445A JPH096445A JP7158902A JP15890295A JPH096445A JP H096445 A JPH096445 A JP H096445A JP 7158902 A JP7158902 A JP 7158902A JP 15890295 A JP15890295 A JP 15890295A JP H096445 A JPH096445 A JP H096445A
- Authority
- JP
- Japan
- Prior art keywords
- maximum power
- product
- point
- operating point
- voltage
- 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
Links
- 238000000034 method Methods 0.000 title claims description 9
- 230000003247 decreasing effect Effects 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims description 9
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 1
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
- Control Of Electrical Variables (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、太陽光発電システム等
に使用されている太陽電池から電力を最大限に取り出す
ための太陽電池の最大電力制御法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell maximum power control method for maximally extracting electric power from a solar cell used in a solar power generation system or the like.
【０００２】[0002]
【従来の技術】太陽電池には、取り出し電流値Ｉを増加
させて行くと出力電圧Ｖが徐々に低下する性質があるた
め、取り出し電流値Ｉと出力電圧Ｖの積である電力Ｐを
太陽電池から最大限取り出すためには、動作点（Ｖ−Ｐ
特性線上の位置）を制御する必要がある。2. Description of the Related Art Since a solar cell has a property that the output voltage V gradually decreases as the extraction current value I is increased, the power P which is the product of the extraction current value I and the output voltage V is supplied to the solar cell. In order to extract the maximum from the operating point (VP
It is necessary to control the position on the characteristic line).
【０００３】従来の太陽電池の最大電力制御法として
は、太陽電池の出力電流と出力電圧とから出力電力を逐
次演算して過去の最大電力値を記憶させておき、現在の
電力値を記憶されている過去の最大電力値と比較して現
在の電力が最大であるか否かを判断し、最大電力点を探
す方法があった。しかしこの方法は専用の記憶回路を必
要とするうえ、マイコン等を用いて制御するには演算及
び制御ルーチン用のソフトウエアが必要であった。As a conventional maximum power control method for a solar cell, the output power is sequentially calculated from the output current and the output voltage of the solar cell to store the maximum power value in the past, and the current power value is stored. There is a method of determining whether or not the present power is the maximum by comparing with the past maximum power value and searching for the maximum power point. However, this method requires a dedicated memory circuit and requires software for arithmetic and control routines in order to control using a microcomputer or the like.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、過去の最大電力を記憶させることな
く、現在の状態から任意の日射強度において動作点を最
大電力点へ移動させることができ、これによってハード
ウエアの簡素化を図ることのできる太陽電池の最大電力
制御法を提供するためになされたものである。The present invention solves the above-mentioned conventional problems, and moves the operating point from the current state to the maximum power point at an arbitrary insolation intensity without storing the past maximum power. It is intended to provide a maximum power control method for a solar cell, which can realize a hardware simplification.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、太陽電池の出力電力の微分値と
出力電圧の微分値とを乗算し、その積が正であるときに
は取り出し電流値を減少させ、その積が負であるときに
は取り出し電流値を増加させることにより、動作点を最
大電力点へ移動させることを特徴とするものである。DISCLOSURE OF THE INVENTION The present invention made to solve the above problems is to multiply a differential value of output power of a solar cell and a differential value of output voltage, and take out when the product is positive. It is characterized in that the operating point is moved to the maximum power point by decreasing the current value and increasing the extraction current value when the product is negative.
【０００６】[0006]
【作用】太陽電池の電圧電流及び電圧電力特性は図１に
示すとおりであり、Ｐmax として示した点が最大電力点
である。そしてこれに対応する出力電圧が、最適動作電
圧Ｖopt となる。さて動作点はこのＶ−Ｐ特性線上を移
動するが、そのパターンは次の４種類となる。 最適動作電圧Ｖopt 以下の領域において最大電力点Ｐ
max から遠ざかる場合。 最適動作電圧Ｖopt 以上の領域において最大電力点Ｐ
max から遠ざかる場合。 最適動作電圧Ｖopt 以下の領域において最大電力点Ｐ
max に接近する場合。 最適動作電圧Ｖopt 以上の領域において最大電力点Ｐ
max に接近する場合。The voltage-current and voltage-power characteristics of the solar cell are as shown in FIG. 1, and the point indicated by P max is the maximum power point. The output voltage corresponding to this becomes the optimum operating voltage V opt . Now, the operating point moves on this V-P characteristic line, but the patterns are the following four types. The maximum power point P in the region below the optimum operating voltage V opt
When moving away from max . Maximum power point P in the region above the optimum operating voltage V opt
When moving away from max . The maximum power point P in the region below the optimum operating voltage V opt
When approaching max . Maximum power point P in the region above the optimum operating voltage V opt
When approaching max .
【０００７】の場合、動作点が最大電力点Ｐmax から
遠ざかっているために出力電力の微分値は負となり、出
力電圧も低下しているから出力電圧の微分値も負とな
る。その結果、出力電力の微分値と出力電圧の微分値と
を乗算した積は正となる。またの場合には、動作点が
最大電力点Ｐmax から遠ざかっているために出力電力の
微分値は負となるが出力電圧は増加しているから出力電
圧の微分値は正となり、出力電力の微分値と出力電圧の
微分値とを乗算した積は負となる。同様に、の場合に
は微分値の積は正となり、の場合には微分値の積は負
となる。In the case of (1), since the operating point is far from the maximum power point P max , the differential value of the output power is negative, and the output voltage is also low, so the differential value of the output voltage is also negative. As a result, the product of the differential value of the output power and the differential value of the output voltage is positive. In this case, the differential value of the output power is negative because the operating point is far from the maximum power point P max, but the differential value of the output voltage is positive because the output voltage is increasing, and the differential value of the output power is The product of the differential value and the differential value of the output voltage is negative. Similarly, in case of, the product of differential values is positive, and in case of, the product of differential values is negative.
【０００８】このように、演算された微分値の積は、動
作点が最適動作電圧Ｖopt 以下の領域においては常に正
となり、最適動作電圧Ｖopt 以上の領域においては常に
負となる。従って、微分値の積が正の場合には取り出し
電流値を減少させることによって出力電力を増加させ、
動作点を最大電力点Ｐmax へ移動させればよく、逆に微
分値の積が負の場合には取り出し電流値を増加させるこ
とによって出力電力を減少させ、動作点を最大電力点Ｐ
max へ移動させればよい。このようにして、本発明によ
れば過去の記憶に頼ることなく、任意の日射強度におい
て常に動作点が最大電力点Ｐmax を追尾するように動作
させることができる。[0008] Thus, the product of the calculated differential value is always positive in the following areas optimum operating voltage V opt is the operating point, always negative in optimum operating voltage V opt more regions. Therefore, when the product of the differential values is positive, the output power is increased by decreasing the extraction current value,
It suffices to move the operating point to the maximum power point P max . Conversely, when the product of the differential values is negative, the output current is decreased by increasing the extraction current value, and the operating point is changed to the maximum power point P max.
Just move it to max . In this way, according to the present invention, it is possible to operate so that the operating point always tracks the maximum power point P max at any insolation intensity without relying on past memory.
【０００９】[0009]
【実施例】図２は本発明の実施例を説明するブロック図
である。１は出力演算装置であり、太陽電池の出力電流
Ｉと出力電圧Ｖとから出力電力Ｐを演算する。２は出力
電力Ｐの微分演算要素であり、出力電力Ｐの微分値を出
力する。３は出力電圧Ｖの微分演算要素であり、出力電
圧Ｖの微分値を出力する。４は乗算要素であり、出力電
力Ｐの微分値と出力電圧Ｖの微分値とを乗算する。FIG. 2 is a block diagram for explaining an embodiment of the present invention. Reference numeral 1 denotes an output calculation device, which calculates an output power P from an output current I and an output voltage V of the solar cell. Reference numeral 2 denotes a differential operation element of the output power P, which outputs a differential value of the output power P. Reference numeral 3 denotes a differential operation element of the output voltage V, which outputs a differential value of the output voltage V. Reference numeral 4 is a multiplication element that multiplies the differential value of the output power P and the differential value of the output voltage V.
【００１０】この乗算要素４の出力は符号判定要素５に
おいて正負の判定がなされ、その２値の出力は制御電圧
の増減切換要素６へ送られる。この制御電圧の増減切換
要素６は、太陽電池からの取り出し電流量を加減するた
めに用いる制御電圧を増減するためのものであり、電流
加減要素７が太陽電池からの取り出し電流量を加減す
る。The sign output of the multiplication element 4 is positively or negatively judged by the sign judgment element 5, and the binary output is sent to the control voltage increase / decrease switching element 6. The control voltage increase / decrease switching element 6 is for increasing / decreasing the control voltage used to adjust the amount of current drawn from the solar cell, and the current adjustment element 7 adjusts the amount of current drawn from the solar cell.
【００１１】このように、出力電力Ｐの微分値と出力電
圧Ｖの微分値とを乗算した積が正であるときには取り出
し電流値を減少させ、その積が負であるときには取り出
し電流値を増加させることにより、動作点を最大電力点
へ移動させることができる。図３は上記の制御法を実施
するために使用される基本回路を示すものである。As described above, when the product of the differential value of the output power P and the differential value of the output voltage V is positive, the extraction current value is decreased, and when the product is negative, the extraction current value is increased. As a result, the operating point can be moved to the maximum power point. FIG. 3 shows the basic circuit used to implement the above control method.
【００１２】[0012]
【発明の効果】以上に説明したように、本発明によれば
過去の最大電力を記憶させる必要がなく、現在の状態か
ら任意の日射強度において動作点を最大電力点へ追尾さ
せて移動させることができる。このため、マイコン等を
用いたデジタル制御が不要となるため、ハードウエアの
簡素化が図れるとともに、それに伴うソフトウエアの開
発も不要となる利点がある。As described above, according to the present invention, it is not necessary to store the maximum power in the past, and the operating point is moved to the maximum power point from the current state at any insolation intensity. You can For this reason, digital control using a microcomputer or the like is not required, which simplifies the hardware, and there is an advantage that software development associated therewith is also unnecessary.
【図１】太陽電池の電圧電流及び電圧電力特性図であ
る。FIG. 1 is a voltage-current and voltage-power characteristic diagram of a solar cell.
【図２】実施例のブロック図である。FIG. 2 is a block diagram of an embodiment.
【図３】実施例の制御法を実施するために使用される基
本回路図である。FIG. 3 is a basic circuit diagram used for implementing the control method of the embodiment.
【符号の説明】 Ｖ 出力電圧 Ｉ 出力電流 Ｐ 出力電力 Ｐmax 最大電力点 Ｖopt 最適動作電圧 １ 出力演算装置 ２ 出力電力の微分演算要素 ３ 出力電圧の微分演算要素 ４ 乗算要素 ５ 符号判定要素 ６ 制御電圧の増減切換要素 ７ 電流加減要素[Explanation of Codes] V Output Voltage I Output Current P Output Power P max Maximum Power Point V opt Optimal Operating Voltage 1 Output Calculation Device 2 Output Power Differential Calculation Element 3 Output Voltage Differential Calculation Element 4 Multiplication Element 5 Sign Judgment Element 6 Control voltage increase / decrease switching element 7 Current adjustment element
Claims (1)
の微分値とを乗算し、その積が正であるときには取り出
し電流値を減少させ、その積が負であるときには取り出
し電流値を増加させることにより、動作点を最大電力点
へ移動させることを特徴とする太陽電池の最大電力制御
法。1. A differential value of the output power of a solar cell is multiplied by a differential value of the output voltage, and when the product is positive, the extraction current value is decreased, and when the product is negative, the extraction current value is increased. A method for controlling the maximum power of a solar cell, characterized in that the operating point is moved to the maximum power point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7158902A JPH096445A (en) | 1995-06-26 | 1995-06-26 | Maximum power control method for solar battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7158902A JPH096445A (en) | 1995-06-26 | 1995-06-26 | Maximum power control method for solar battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH096445A true JPH096445A (en) | 1997-01-10 |
Family
ID=15681866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7158902A Pending JPH096445A (en) | 1995-06-26 | 1995-06-26 | Maximum power control method for solar battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH096445A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101006100B1 (en) * | 2010-03-03 | 2011-01-07 | 인타스(주) | Photovoltaic control system and method for estimating maximum power using perturbation and observation methods according to solar radiation |
| JP2015055920A (en) * | 2013-09-10 | 2015-03-23 | 山洋電気株式会社 | Maximum power point tracking device and power conversion device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043719A (en) * | 1983-08-19 | 1985-03-08 | Daihen Corp | Optical battery power supply device |
| JPH07239724A (en) * | 1994-02-25 | 1995-09-12 | Matsushita Electric Works Ltd | Solar power generation system and its maximum electric power control method |
-
1995
- 1995-06-26 JP JP7158902A patent/JPH096445A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043719A (en) * | 1983-08-19 | 1985-03-08 | Daihen Corp | Optical battery power supply device |
| JPH07239724A (en) * | 1994-02-25 | 1995-09-12 | Matsushita Electric Works Ltd | Solar power generation system and its maximum electric power control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101006100B1 (en) * | 2010-03-03 | 2011-01-07 | 인타스(주) | Photovoltaic control system and method for estimating maximum power using perturbation and observation methods according to solar radiation |
| JP2015055920A (en) * | 2013-09-10 | 2015-03-23 | 山洋電気株式会社 | Maximum power point tracking device and power conversion device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19980327 |