JP3553574B2 - Control method of power converter for photovoltaic power generation - Google Patents
Control method of power converter for photovoltaic power generation Download PDFInfo
- Publication number
- JP3553574B2 JP3553574B2 JP22055695A JP22055695A JP3553574B2 JP 3553574 B2 JP3553574 B2 JP 3553574B2 JP 22055695 A JP22055695 A JP 22055695A JP 22055695 A JP22055695 A JP 22055695A JP 3553574 B2 JP3553574 B2 JP 3553574B2
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- Prior art keywords
- power
- solar cell
- set value
- tracking control
- control
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- 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.)
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Control Of Electrical Variables (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、太陽光発電用電力変換装置の制御法に関する。
【０００２】
【従来の技術】
太陽電池の出力電力は太陽電池の動作点によって大きく変わるため、太陽電池の発電電力を有効に利用するためには、太陽電池の最大電力を与える動作点を探してそこへ動作点を移動する最大電力追従制御を行わなければならない。しかし、太陽電池の発電電力は低日射時にはほぼ平坦となるため、この状態の時に最大電力追従制御を行ってもかえって非能率となってしまう。そのため、通常、日射時には最大電力追従制御を停止するようにしている。
従来においては、最大電力追従制御の開始・停止の判断は太陽電池の出力電圧が設定値になることを判断して行っていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、太陽電池の出力電圧で判断する従来の方法では、太陽電池の出力電圧は太陽電池の温度などによって大きく変化するため、最大電力追従制御の開始・停止において誤差が生じたり、安定して動作しない等の問題があった。
そこで本発明が解決すべき課題は、太陽電池の最大電力追従制御の開始・停止を安定かつ確実に行うことにある。
【０００４】
【課題を解決するための手段】
前記課題を解決するため、本発明は、太陽電池の出力電力を電力変換装置を介して負荷に給電し、前記太陽電池の出力電力が最大になるように前記太陽電池の動作点を調節する最大電力追従制御を行う電力変換装置の制御法において、前記太陽電池の出力電力が第１の設定値以上になると前記最大電力追従制御を開始し、前記第１の設定値よりも小さい第２の設定値以下になると前記最大電力追従制御を停止するようにしたものである。
【０００５】
【作用】
上記手段によって、太陽電池の発電電力を計測しながら最大電力点追従制御の開始および停止を行い、太陽電池の温度等の条件によって影響を受けず太陽電池の発電電力を有効に利用でき、また前記第２の設定値を第１の設定値よりも小さくすることによって、最大電力追従制御の開始・停止の繰り返し（ハンチング）を防ぐことができ、安定した制御が可能となる。
【０００６】
【実施例】
以下、本発明の実施例を図面に基づいて説明する。
図１は本発明の実施例を示す回路図である。図中、１は太陽電池、２は電力変換装置、３は系統電源と負荷、４は太陽電池電圧検出回路、５は太陽電池電流検出回路、６は太陽電池出力電力演算器、７は最大電力追従制御開始・停止判断回路である。図２は本発明の制御の手順を示すフローチャートである。
次に、本発明実施例の動作を図２のフローチャートを参照しながら説明する。太陽電池１の出力電圧ＶＳと出力電流ＩＳを図１の太陽電池電圧検出回路４と太陽電池電流検出回路５で検出し、太陽電池１の出力電力ＰＳを太陽電池出力電力演算器６で演算する（図２のステップ１１０）。最大電力追従制御開始・停止判断回路７は第１の設定値で表される開始電力とこの第１の設定値よりも小さい第２の設定値で表される停止電力を記憶できるものとし、演算器６が計算した太陽電池１の発電電力ＰＳと開始電力、停止電力とを比較して（図２のステップ１２０）、発電電力ＰＳが開始電力よりも大きければ最大出力点追従制御の開始信号を電力変換装置２に送り（図２のステップ１３０）、発電電力が停止電力よりも小さければ（図２のステップ１４０）、最大出力点追従制御の停止信号を電力変換装置２に送る（図２のステップ１５０）。
【０００７】
電力変換装置２は最大電力追従制御開始・停止判断回路７から開始信号を受けると最大電力点追従制御を停止信号を受けるまで続ける。このとき開始電力（第１の設定値）＞停止電力（第２の設定値）であるので、太陽電池出力電力が開始電力と停止電力付近でふらついているときでも、開始・停止の状態を繰り返す、いわゆるハンチングを起こさない。従って、制御上安定した動作が可能となる。
【０００８】
【発明の効果】
以上述べたように、本発明によれば下記の効果を奏する。
（１） 太陽電池の最大電力点追従制御の開始・停止を安定かつ確実に行える。
（２） 発電電力が低い時のハンチングを防止できる。
（３） 以上により、制御回路の安定化と信頼性の向上を図ることができる。
【図面の簡単な説明】
【図１】本発明の実施例を示す回路図である。
【図２】本発明の制御の手順を示すフローチャートである。
【符号の説明】
１ 太陽電池、２ 電力変換装置、３ 系統電源と負荷、４ 太陽電池電圧検出回路、５ 太陽電池電流検出回路、６ 太陽電池出力電力演算器、７ 最大電力追従制御開始・停止判断回路[0001]
[Industrial applications]
The present invention relates to a method for controlling a power converter for photovoltaic power generation.
[0002]
[Prior art]
Since the output power of a solar cell varies greatly depending on the operating point of the solar cell, in order to effectively use the power generated by the solar cell, an operating point that provides the maximum power of the solar cell is searched and the operating point is moved there. Power follow-up control must be performed. However, the power generated by the solar cell becomes almost flat during low solar radiation, and in this state, even if the maximum power follow-up control is performed, it becomes inefficient. For this reason, the maximum power follow-up control is usually stopped at the time of solar radiation.
Conventionally, the start / stop of the maximum power follow-up control is determined by determining that the output voltage of the solar cell reaches a set value.
[0003]
[Problems to be solved by the invention]
However, in the conventional method of judging from the output voltage of the solar cell, since the output voltage of the solar cell greatly changes depending on the temperature of the solar cell, an error occurs in starting / stopping the maximum power tracking control, or the operation is stable. There was a problem such as not doing.
Therefore, a problem to be solved by the present invention is to start and stop the maximum power tracking control of a solar cell stably and reliably.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a method of supplying output power of a solar cell to a load via a power converter, and adjusting an operating point of the solar cell so that the output power of the solar cell is maximized. In the control method of the power conversion device that performs the power tracking control, the maximum power tracking control is started when the output power of the solar cell becomes equal to or more than a first set value, and a second setting smaller than the first set value is performed. When the value becomes equal to or less than the value, the maximum power follow-up control is stopped.
[0005]
[Action]
By the above means, start and stop of the maximum power point tracking control while measuring the generated power of the solar cell, it is possible to effectively use the generated power of the solar cell without being affected by conditions such as the temperature of the solar cell, By making the second set value smaller than the first set value, repetition (hunting) of start / stop of the maximum power tracking control can be prevented, and stable control can be performed.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the figure, 1 is a solar cell, 2 is a power converter, 3 is a system power supply and load, 4 is a solar cell voltage detection circuit, 5 is a solar cell current detection circuit, 6 is a solar cell output power calculator, and 7 is a maximum power. This is a tracking control start / stop determination circuit. FIG. 2 is a flowchart showing a control procedure according to the present invention.
Next, the operation of the embodiment of the present invention will be described with reference to the flowchart of FIG. Detects the output voltage V S and the output current I S of the solar cell 1 in the solar cell
[0007]
Upon receiving the start signal from the maximum power tracking control start / stop determination circuit 7, the
[0008]
【The invention's effect】
As described above, the present invention has the following effects.
(1) It is possible to start and stop the maximum power point tracking control of the solar cell stably and reliably.
(2) Hunting when the generated power is low can be prevented.
(3) As described above, the control circuit can be stabilized and reliability can be improved.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of the present invention.
FIG. 2 is a flowchart showing a control procedure according to the present invention.
[Explanation of symbols]
Reference Signs List 1 solar cell, 2 power converter, 3 system power supply and load, 4 solar cell voltage detection circuit, 5 solar cell current detection circuit, 6 solar cell output power calculator, 7 maximum power tracking control start / stop determination circuit
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22055695A JP3553574B2 (en) | 1995-08-29 | 1995-08-29 | Control method of power converter for photovoltaic power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22055695A JP3553574B2 (en) | 1995-08-29 | 1995-08-29 | Control method of power converter for photovoltaic power generation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0962386A JPH0962386A (en) | 1997-03-07 |
| JP3553574B2 true JP3553574B2 (en) | 2004-08-11 |
Family
ID=16752851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22055695A Expired - Lifetime JP3553574B2 (en) | 1995-08-29 | 1995-08-29 | Control method of power converter for photovoltaic power generation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3553574B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4489087B2 (en) * | 2007-03-08 | 2010-06-23 | 三菱電機株式会社 | Solar power system |
| CN102738887B (en) * | 2011-04-11 | 2015-05-27 | 周锡卫 | System for intelligently allocating power supply from renewable energy power and grid power |
| JP5829053B2 (en) * | 2011-06-03 | 2015-12-09 | 株式会社ダイヘン | Grid-connected inverter device |
| JP5879495B2 (en) | 2012-01-31 | 2016-03-08 | パナソニックＩｐマネジメント株式会社 | Power converter |
| CN103427443B (en) * | 2012-05-14 | 2016-01-20 | 周锡卫 | A kind of generation of electricity by new energy electric power system based on many electric intelligents tuner |
| JP6034728B2 (en) * | 2013-03-12 | 2016-11-30 | 株式会社デンソー | Power system |
| CN104079009B (en) * | 2014-07-14 | 2016-06-22 | 华北电力大学（保定） | A kind of grid-connected photovoltaic power supply direct current energy transfer control method |
| CN106230019A (en) * | 2016-08-01 | 2016-12-14 | 芜湖格利特新能源科技有限公司 | A kind of distributed photovoltaic micro-grid system of long-range control |
-
1995
- 1995-08-29 JP JP22055695A patent/JP3553574B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0962386A (en) | 1997-03-07 |
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