JPS63153614A - Power converter - Google Patents
Power converterInfo
- Publication number
- JPS63153614A JPS63153614A JP61300345A JP30034586A JPS63153614A JP S63153614 A JPS63153614 A JP S63153614A JP 61300345 A JP61300345 A JP 61300345A JP 30034586 A JP30034586 A JP 30034586A JP S63153614 A JPS63153614 A JP S63153614A
- Authority
- JP
- Japan
- Prior art keywords
- output voltage
- inverter
- voltage
- circuit
- output
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 9
- 230000005855 radiation Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method 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)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は太陽電池を電源として交流電動機等の負荷を駆
動するに好適な電力変換装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a power conversion device suitable for driving a load such as an AC motor using a solar cell as a power source.
〈従来の技術〉
太陽電池の直流電圧をＰＷＭ変調し、ｊｑられる交流電
圧をず一１荷に供給するインバータ回路と、上記直流７
目斤を所定電圧に保持するために上記インバータ回路に
おける変調周波数（６よび変調度を設定する制御回路と
を猫えた電力変換装置については、例えば１：ｉ開明５
９−７０１ ａ ｅ 弓公報に開示されている。この提
案は、第４図に承りように、太陽電池１の出力電圧Ｖ９
．。、を速度λ４ｖ１［回路５で検出して、その電圧が
太陽電池ａの最適動作点に１３ける電圧Ｖ１ （第５図
参照）になるように速度阜べｔ信月ｆＲを出力する。こ
の速度塁へｔ信号ｆ８はインバータ制御回路６に人力さ
れ、これに基づいて電動機４か駆動されろ。<Prior art> An inverter circuit that performs PWM modulation on the DC voltage of a solar cell and supplies the jq-generated AC voltage to the
For a power conversion device that uses a control circuit that sets the modulation frequency (6) and the degree of modulation in the inverter circuit to maintain the voltage at a predetermined voltage, for example, 1:i Kaimei 5
9-701 ae Disclosed in the Bow Publication. This proposal is based on the output voltage V9 of the solar cell 1, as shown in FIG.
．． . , is detected by the speed λ4v1 [circuit 5, and outputs the speed fR so that the voltage becomes the voltage V1 at the optimal operating point of the solar cell a (see FIG. 5). The speed signal f8 is input to the inverter control circuit 6, and the electric motor 4 is driven based on this signal.
そして主回路インバータ３は一般にＰＷ〜１変調方式で
インバータ出力電圧Ｖとインパーク出力周波数ｆとの比
か一定（Ｖ／Ｆ−足利ｉ３＋ｉ ＞になるように前記イ
ンバータ制御回路６により制御されている。The main circuit inverter 3 is generally controlled by the inverter control circuit 6 using the PW~1 modulation method so that the ratio between the inverter output voltage V and the impark output frequency f is constant (V/F - Ashikaga i3+i > .
このよう（こ、太陽電池１の出力電圧Ｖ Ｄ、 Ｃ，が
常に所定の電圧ｖ１となるようにインバータ回路におけ
る変調周波数および変調度を制御することによって、日
射量の増大で太陽電池１の介生電ツノが第５図のように
変化するとき、太陽電池１の作動点をＡ−＋Ｂ−＋Ｃと
変化させて最大出力点イ」近で動作させるから、電動機
４には常にそのときの最入電ツノを供給することが可能
となる。In this way, by controlling the modulation frequency and degree of modulation in the inverter circuit so that the output voltage V D, C, of the solar cell 1 is always at a predetermined voltage v1, the intervention of the solar cell 1 due to an increase in the amount of solar radiation is controlled. When the live power horn changes as shown in Fig. 5, the operating point of the solar cell 1 is changed to A-+B-+C to operate near the maximum output point A, so the motor 4 is always given the maximum power at that time. It becomes possible to supply an incoming power horn.
〈発明か解決しようとする問題点〉
一般に太陽電池を電源として電動機を駆動する場合、商
用の電力供給システムと連繋してバックアップを受りる
か否かに係わりなく、太陽電池の冬期における発電電力
不足や変損効率の経年変化による出力低下性を考慮して
、太陽電池の出力に余裕を持たせて設計するのが常であ
る。ところが太陽電池の出力に余裕をもたせると、上記
した電力変換装置との関係では、つぎのような問題を生
じることになった。<Problem to be solved by the invention> In general, when a solar cell is used as a power source to drive an electric motor, the power generated by the solar cell in winter is It is common to design solar cells with a margin in their output, taking into account the possibility of a decrease in output due to shortages or changes in efficiency over time. However, if a margin is provided for the output of the solar cell, the following problems arise in relation to the above-mentioned power conversion device.
すなわち、既にインバータは第５図の点Ｂで最大の変調
度（インバータ出力電圧Ｖ、インバータ出力周波数「と
もに最大〉で動作しているとする。ここで更に日射量が
増大したとすると、その日射量の増大に応じてインバー
タは太陽電池１から取出す電流値を増加させ、第５図の
点Ｃに動作点を移動させようとするが、上記したとおり
、既に点Ｂで最大の変調度（Ｖ、「ともに最大）である
から、インバータ出力周波数Ｆは増加できず、このため
動作点は点Ｃに移動できずに、もつと高圧の方へ移動し
てしまった。In other words, it is assumed that the inverter is already operating at the maximum modulation degree (both the inverter output voltage V and the inverter output frequency are maximum) at point B in Figure 5.If the amount of solar radiation increases further, the amount of solar radiation As the amount increases, the inverter increases the current value taken out from the solar cell 1 and attempts to move the operating point to point C in FIG. 5, but as mentioned above, the maximum modulation degree (V , ``both are maximum)'', the inverter output frequency F could not be increased, and therefore the operating point could not be moved to point C, but instead moved toward higher voltage.
一方、周波数一定としたときの電動機−次電圧をパラメ
ータとする誘導電動機の運転特性は第６図に示すとおり
でおり、この図からもわかるように、たとえ−次電圧が
１２０％電圧まで上界しても電動機速度は少ししか変化
せず、負荷を増加させることはできないため、電動機は
定格電圧を上回る過電圧の状態で運転され、絶縁破損等
をきたす虞があったのである。On the other hand, the operating characteristics of an induction motor with the motor-order voltage as a parameter when the frequency is constant are as shown in Figure 6.As can be seen from this figure, even if the -order voltage reaches 120% voltage, there is an upper limit. However, the motor speed changes only slightly and the load cannot be increased, so the motor is operated at an overvoltage that exceeds the rated voltage, which could lead to insulation damage.
本発明は、定常時においては、太陽電池の出力電圧を所
定の一定電圧に保持することで、太陽電池の受光量が変
化しても常に最大電力を取出せるという点は、従来どお
りとするが、太陽電池の発電電力が負荷の能力を超えた
場合においては、電動機にその定格電圧を超えた過電圧
がかかることを防ぎ、しかもこれを比較的簡単な回路構
成で達成できる電力変換装置を提供することを目的とし
ている。The present invention maintains the output voltage of the solar cell at a predetermined constant voltage during steady state, so that the maximum power can always be obtained even if the amount of light received by the solar cell changes. To provide a power conversion device that prevents an overvoltage exceeding the rated voltage from being applied to a motor when the generated power of a solar cell exceeds the capacity of a load, and that can achieve this with a relatively simple circuit configuration. The purpose is to
〈問題点を解決するための手段〉
このため、本発明は、上記した従来の電力変換装置の回
路構成に、更に、太陽電池の出力が負債容伍を超えたこ
とを検出すると共に、インバータ出力電圧を制御して、
電動機に過電圧が加わることを防ぐ出力電圧調整回路を
設けるようにしたものである。<Means for Solving the Problems> For this reason, the present invention adds to the circuit configuration of the conventional power conversion device described above, detects that the output of the solar cell exceeds the debt capacity, and adjusts the output of the inverter. control the voltage,
An output voltage adjustment circuit is provided to prevent overvoltage from being applied to the motor.
〈作 用〉
従来の制御だとＶ／Ｆのパターンが一種類で必り、しか
もＶ／Ｆ−足利御であるために、ＰＷＭ変：Ａ度が最大
の辿点まで行ってしまうと制御不能になって、電動機に
過電圧が加わってしまった。これに対して、本発明では
、通常時は太陽電池電圧−足利御を１１ない、太陽電池
の出力が負荷の能力を超えて出力電圧ＶＤ、 Ｃ，が上
界してくると、これを出力電圧調整回路によって検出し
、インバータのＰＷＭ変調度を調整して、インバータ出
力電圧を電動機の定格電圧以上には上がらないように低
下させる。こうして電動機に過電圧が加わらないように
できる。<Function> With conventional control, only one V/F pattern is required, and since it is controlled by V/F - Ashikaga, control becomes uncontrollable when the PWM variation: A degree reaches the maximum trace point. As a result, overvoltage was applied to the motor. On the other hand, in the present invention, the solar cell voltage - Ashikaga control is not normally controlled by 11, but when the output of the solar cell exceeds the capacity of the load and the output voltage VD, C, exceeds the limit, this is output. It is detected by a voltage adjustment circuit, and the PWM modulation degree of the inverter is adjusted to lower the inverter output voltage so that it does not rise above the rated voltage of the motor. In this way, it is possible to prevent overvoltage from being applied to the motor.
〈実施例〉 以下、本発明の実施例を詳細に説明する。<Example> Examples of the present invention will be described in detail below.
第１図は本発明の一実施例に係る電力変換装置の回路構
成図であって、第４図に示したものと同一部分について
は同一符号を付している。FIG. 1 is a circuit diagram of a power converter according to an embodiment of the present invention, and the same parts as those shown in FIG. 4 are designated by the same reference numerals.
第１図と第４図とを対比すれば、第４図と異なる点は出
力電圧調整回路７が加わった点であることが明瞭である
。尚、２は発生する高周波電圧成分を吸収するコンデン
サを示している。Comparing FIG. 1 and FIG. 4, it is clear that the difference from FIG. 4 is that an output voltage adjustment circuit 7 is added. Note that 2 indicates a capacitor that absorbs the generated high frequency voltage component.
出力電圧調整回路７は太陽電池１の出力電圧、換言すれ
ばインバータ入力電圧を入力して、その入力した電圧が
電動機定格電圧に対応するインバータ入力電圧ＶＴに達
したかどうかを常時監視している。そしてインバータ入
力電圧ＶＴに達する以前と以後とでは出力電圧調整回路
７からの出力は、以下のように相違する。これをインバ
ータ入力電圧−インバータ出力電圧の特性を示した第３
図を使って説明すると、インバータ入力電圧がＶ、に達
しない、太陽電池１の出力電力が負荷の消費電力以下の
場合には、実線で示した出力電圧調整回路７有りの場合
も、点線で示した出力電圧調整回路無しの場合も、共に
インバータ入力電圧の上昇に伴い、Ｖ／Ｆ−足利御の働
きでインバータ出力電圧を上昇ざず点で変りはない。速
度基準回路５はインバータ入力電圧が第５図のＶｌとな
るように速度基準信号ｆＲを出力し、この速度基準信＠
ｆＲにより、出力電圧調整回路７は第２図のＶ／Ｆパタ
ーンによってインバータ出力電圧を決定し、出力電圧ｖ
Ｒを出力する。そしてインバータ制御回路６では上記の
速度基準信号ｆＲ１出力信号ＶＲに基づいてブリッジ構
成の主回路を駆動し、最終的にインバータ３は電圧ＶＲ
１周波数ｆＲの交流を出力する。The output voltage adjustment circuit 7 inputs the output voltage of the solar cell 1, in other words, the inverter input voltage, and constantly monitors whether the input voltage has reached the inverter input voltage VT corresponding to the motor rated voltage. . The output from the output voltage adjustment circuit 7 differs as follows before and after reaching the inverter input voltage VT. This is shown in the third section showing the characteristics of inverter input voltage - inverter output voltage.
To explain using a diagram, if the inverter input voltage does not reach V, and the output power of the solar cell 1 is less than the power consumption of the load, even if the output voltage adjustment circuit 7 is included, which is indicated by the solid line, the dotted line Even in the case without the output voltage adjustment circuit as shown, there is no difference in that the inverter output voltage does not increase due to the V/F-Ashikaga control as the inverter input voltage increases. The speed reference circuit 5 outputs the speed reference signal fR so that the inverter input voltage becomes Vl in FIG.
Based on fR, the output voltage adjustment circuit 7 determines the inverter output voltage according to the V/F pattern shown in FIG.
Output R. Then, the inverter control circuit 6 drives the main circuit of the bridge configuration based on the speed reference signal fR1 output signal VR, and finally the inverter 3 drives the voltage VR
Outputs alternating current with one frequency fR.
インバータ入力電圧が■Ｔに達する、太陽電池１の出力
電力が負荷の消費電力を超える場合には、出力電圧調整
回路無しの場合は、前述した理由によってインバータ入
力電圧の上昇に伴ってインバータ出力電圧も更に上昇す
る。これに対して、出力電圧調整回路有りの場合は、イ
ンバータ入力電圧が上昇しても、インバータ出力電圧は
電動機定格電圧以上にならないように制御を受ける。す
なわち、太陽電池１の出力電力が負荷の消費電力を超え
る場合はＶ／Ｆパターンは既に最大の点で動作している
ためインバータ入力電圧の上昇をみるが、出力電圧調整
回路７でこれを検知すると、該回路７からは電動機定格
電圧以内になるようにＰＷＭ変調度を調整した出力信号
ＶＲ′を出力する。これによってインバータ３は電動機
の定格電圧、周波数ｆｍａｘの交流を出力する。When the inverter input voltage reaches ■T and the output power of the solar cell 1 exceeds the power consumption of the load, if there is no output voltage adjustment circuit, the inverter output voltage will increase as the inverter input voltage increases due to the above-mentioned reason. will also rise further. On the other hand, when an output voltage adjustment circuit is provided, even if the inverter input voltage increases, the inverter output voltage is controlled so as not to exceed the motor rated voltage. In other words, when the output power of the solar cell 1 exceeds the power consumption of the load, the V/F pattern is already operating at the maximum point, so the inverter input voltage will increase, but the output voltage adjustment circuit 7 will detect this. Then, the circuit 7 outputs an output signal VR' whose PWM modulation degree is adjusted to be within the motor rated voltage. As a result, the inverter 3 outputs an alternating current at the rated voltage of the motor and the frequency fmax.
〈発明の効果〉
以上のように、本発明によれば、常時は太陽電池出力電
力を最大とするためのＶ／Ｆ一定１す御も、また、太陽
電池の出力電力が負荷の消費電力を超えた場合には、電
動機の定格以上の電圧を出力せず、電動機に過電圧が加
わることを防止する出力電圧制御も、同様に行なうこと
ができる。しかも、電動機定格電圧を超えるときのイン
バータ出力電圧を検出して出力電圧制御するのではなく
、電動機定格電圧を超えるときの太陽電池出力電圧、換
言すればインバータ入力電圧を出力電圧調整回路で検出
して出力電圧制御するようにしたから、インバータ出力
電圧を監視検出するインバータ出力電圧検知回路が不要
になり、回路構成上、非常に簡単になる。<Effects of the Invention> As described above, according to the present invention, the V/F constant control to maximize the output power of the solar cell at all times also allows the output power of the solar cell to exceed the power consumption of the load. If the voltage exceeds the rated value of the motor, output voltage control can be performed in a similar manner to prevent the application of overvoltage to the motor by not outputting a voltage exceeding the rated value of the motor. Moreover, instead of controlling the output voltage by detecting the inverter output voltage when it exceeds the motor rated voltage, the output voltage adjustment circuit detects the solar cell output voltage when it exceeds the motor rated voltage, in other words, the inverter input voltage. Since the output voltage is controlled by the inverter output voltage, there is no need for an inverter output voltage detection circuit that monitors and detects the inverter output voltage, and the circuit configuration becomes extremely simple.
第１図は本発明の一実施例に係る電力変換装置の回路構
成図、第２図はその電力変換装置によるＶ／Ｆ−足利御
のパターンを示す図、第３図はその電力変換装置の動作
を説明する図、第４図は従来の動力変換装置の説明図、
第５図は太陽電池の特性を示す図、第６図は誘導電動機
の動作特性を示す図である。
１・・・太陽電池、２・・・入力コンデンサ、３・・・
インバータ、４・・・電動機、５・・・速度基準回路、
６・・・インバータ制御回路、７・・・出力電圧調整回
路。FIG. 1 is a circuit configuration diagram of a power conversion device according to an embodiment of the present invention, FIG. 2 is a diagram showing a pattern of V/F-Ashikaga control by the power conversion device, and FIG. 3 is a diagram of the power conversion device. A diagram explaining the operation, FIG. 4 is an explanatory diagram of a conventional power conversion device,
FIG. 5 is a diagram showing the characteristics of a solar cell, and FIG. 6 is a diagram showing the operating characteristics of an induction motor. 1...Solar cell, 2...Input capacitor, 3...
Inverter, 4... Electric motor, 5... Speed reference circuit,
6... Inverter control circuit, 7... Output voltage adjustment circuit.
Claims (1)
電圧を負荷に供給するインバータ回路と、上記直流電圧
を所定電圧に保持するために上記インバータ回路におけ
る変調周波数および変調度を設定するインバータ制御回
路とを備えた電力変換装置において、太陽電池の出力が
負荷容量を超えたことを検出すると共に、インバータ出
力電圧を制御して、負荷に過電圧が加わることを防ぐ出
力電圧調整回路を設けたことを特徴とする電力変換装置
。1. An inverter circuit that performs PWM modulation on the DC voltage of the solar cell and supplies the resulting AC voltage to the load, and an inverter control that sets the modulation frequency and degree of modulation in the inverter circuit to maintain the DC voltage at a predetermined voltage. In a power conversion device equipped with a circuit, an output voltage adjustment circuit is provided that detects that the output of the solar cell exceeds the load capacity, and also controls the inverter output voltage to prevent overvoltage from being applied to the load. A power conversion device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61300345A JPS63153614A (en) | 1986-12-17 | 1986-12-17 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61300345A JPS63153614A (en) | 1986-12-17 | 1986-12-17 | Power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63153614A true JPS63153614A (en) | 1988-06-27 |
Family
ID=17883657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61300345A Pending JPS63153614A (en) | 1986-12-17 | 1986-12-17 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63153614A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7525569B2 (en) | 2001-03-09 | 2009-04-28 | Gallitzin Allegheny Llc | Systems and methods to reversibly convert a film-based camera into a digital camera |
| CN106427615A (en) * | 2016-09-20 | 2017-02-22 | 江苏大学 | Composite power source control system and switching method thereof under different work conditions |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60153526A (en) * | 1984-01-20 | 1985-08-13 | Sanyo Electric Co Ltd | Inverter device |
-
1986
- 1986-12-17 JP JP61300345A patent/JPS63153614A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60153526A (en) * | 1984-01-20 | 1985-08-13 | Sanyo Electric Co Ltd | Inverter device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7525569B2 (en) | 2001-03-09 | 2009-04-28 | Gallitzin Allegheny Llc | Systems and methods to reversibly convert a film-based camera into a digital camera |
| CN106427615A (en) * | 2016-09-20 | 2017-02-22 | 江苏大学 | Composite power source control system and switching method thereof under different work conditions |
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