JP2002345155A - Photovoltaic power generating inverter - Google Patents
Photovoltaic power generating inverterInfo
- Publication number
- JP2002345155A JP2002345155A JP2001142784A JP2001142784A JP2002345155A JP 2002345155 A JP2002345155 A JP 2002345155A JP 2001142784 A JP2001142784 A JP 2001142784A JP 2001142784 A JP2001142784 A JP 2001142784A JP 2002345155 A JP2002345155 A JP 2002345155A
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- Prior art keywords
- voltage
- solar cell
- power supply
- switch
- current
- 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.)
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- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、太陽電池の発電電
力を系統に流し込む太陽光発電インバータに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power generation inverter which supplies power generated by a solar cell to a power system.
【０００２】[0002]
【従来の技術】図１３に従来のインバータを示す。図１
３において、２５は太陽電池、２６は昇圧手段、２７は
コンデンサ、２８は波形成形手段、２９はインダクタ、
３０は系統電源である。この構成において、太陽電池２
５の電圧を系統電源２６の電圧より大きくなるようにコ
ンデンサ２７の電圧を昇圧手段２６により昇圧させ、波
形生手段４により、インダクタンス５を介して系統の電
源に電力を注入する。2. Description of the Related Art FIG. 13 shows a conventional inverter. FIG.
In 3, 25 is a solar cell, 26 is a step-up unit, 27 is a capacitor, 28 is a waveform shaping unit, 29 is an inductor,
Reference numeral 30 denotes a system power supply. In this configuration, the solar cell 2
The voltage of the capacitor 27 is boosted by the booster 26 so that the voltage of the power supply 5 becomes higher than the voltage of the system power supply 26, and the power is injected into the power supply of the system via the inductance 5 by the waveform generator 4.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記従
来の構成では、太陽電池の電圧を昇圧し、系統の電圧よ
り高くしていたので、昇圧手段の部品点数が多く、コス
トも高いという課題を有していた。本発明は、前記従来
の課題を解決するもので、昇圧手段を無くし、部品点数
が少なく、低コストで小型の太陽光発電インバータを提
供することを目的とする。However, in the above-mentioned conventional configuration, the voltage of the solar cell is boosted to be higher than the voltage of the system, so that there is a problem that the number of components of the boosting means is large and the cost is high. Was. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a low-cost and small-sized photovoltaic power inverter which eliminates the step-up means, has a small number of parts, and has a small number of parts.
【０００４】[0004]
【課題を解決するための手段】前記従来の課題を解決す
るために、本発明の太陽光発電インバータは、太陽電池
の電圧を検知する太陽電池電圧検知手段と、系統電源の
電圧を検知する系統電圧検知手段を設け、太陽電池から
の電流をインダクタンスを介して系統に流すスイッチ
と、太陽電池電圧が系統電源検知より大きい時のみ、イ
ンダクタンスを介して系統電源に流す様にスイッチを制
御する制御手段の構成としたものである。In order to solve the above-mentioned conventional problems, a photovoltaic power generation inverter according to the present invention comprises a photovoltaic cell voltage detecting means for detecting a voltage of a photovoltaic cell, and a system for detecting a voltage of a system power supply. A switch provided with voltage detection means for flowing a current from the solar cell to the system via the inductance, and a control means for controlling the switch to flow to the system power supply via the inductance only when the solar cell voltage is higher than the detection of the system power supply The configuration is as follows.
【０００５】これによって、太陽電池電圧が系統電源よ
り大きい時のみ、制御手段によりインダクタンスを介し
て系統電源に電流を流す様にスイッチを制御し、昇圧手
段が無くても系統へ電力の注入が可能となる。[0005] Thus, only when the solar cell voltage is higher than the system power supply, the control means controls the switch so that current flows to the system power supply via the inductance, and power can be injected into the system without the booster means. Becomes
【０００６】[0006]
【発明の実施の形態】請求項１に記載の発明は、太陽電
池と、太陽電池の電圧を検知する太陽電池電圧検知手段
と、系統電源の電圧を検知する系統電圧検知手段を設
け、太陽電池からの電流をインダクタンスを介して系統
に流すスイッチと、太陽電池電圧が系統電源検知より大
きい時のみ、インダクタンスを介して系統電源に流す様
にスイッチを制御する制御手段を備えることにより、
太陽電池電圧が系統電源より大きい時のみ、制御手段に
よりインダクタンスを介して系統電源に電流を流す様に
スイッチを制御する事ができ、昇圧手段が無くても系統
電源へ電力の注入がすることができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is provided with a solar cell, a solar cell voltage detecting means for detecting a voltage of the solar cell, and a system voltage detecting means for detecting a voltage of a system power supply. And a control means for controlling the switch to flow to the system power supply through the inductance only when the solar cell voltage is higher than the system power supply detection,
Only when the solar cell voltage is higher than the system power supply, the switch can be controlled by the control means so that current flows to the system power supply via the inductance, and power can be injected into the system power supply without the boosting means. it can.
【０００７】請求項２に記載の発明は、系統電源電圧の
単相３線の各相間に接続することにより、太陽電池から
系統電源への電力供給が、系統電源周期の全期間可能と
することができる。According to a second aspect of the present invention, the power supply from the solar cells to the system power supply can be performed during the entire system power supply cycle by connecting the system power supply voltage between the single-phase three-wire lines. Can be.
【０００８】請求項３に記載の発明は、スイッチ手段の
開閉時間を制御することにより、系統電源に流し込む電
流量を調整することができる。According to the third aspect of the present invention, the amount of current flowing into the system power supply can be adjusted by controlling the switching time of the switch means.
【０００９】請求項４に記載の発明は、請求項３の太陽
光発電インバータに、系統電源電圧の位相を検知する電
源電圧位相検知手段を、設けるていることである。この
電源電圧位相検知手段により、系統電源電圧の位相を検
知し、その位相に応じて、スイッチ時間制御手段により
スイッチの開閉時間を調整して、系統電源へ流す電流波
形を制御することにより、系統電源の電圧に同期した電
流を系統電源に流すことが出来る。According to a fourth aspect of the present invention, the photovoltaic power generation inverter of the third aspect is provided with a power supply voltage phase detecting means for detecting a phase of a system power supply voltage. By detecting the phase of the system power supply voltage by the power supply voltage phase detecting means and adjusting the switching time of the switch by the switch time control means in accordance with the phase to control the current waveform flowing to the system power supply, A current synchronized with the voltage of the power supply can be supplied to the system power supply.
【００１０】請求項５に記載の発明は、請求項３の太陽
光発電インバータに、太陽電池電圧検知手段とスイッチ
手段と電流検知手段と制御手段の構成により、太陽電池
の電圧と太陽電池の電流を常に検知し、最大の電力を取
り出せるように、制御手段でスイッチ手段の開閉時間を
制御し、系統電源へ流し込む電流を制御する事により、
太陽電池の最大点の電力を引き出すことができる。According to a fifth aspect of the present invention, there is provided a photovoltaic power generation inverter according to the third aspect, wherein the solar cell voltage detection means, the switch means, the current detection means, and the control means are constituted by a solar cell voltage and a solar cell current. By controlling the opening and closing time of the switch means by the control means and controlling the current flowing into the system power supply, so that the maximum power can be taken out by always detecting
The maximum power of the solar cell can be extracted.
【００１１】請求項６に記載の発明は、請求項４の太陽
光発電インバータに、停電検知手段とスイッチ手段とス
イッチ時間制御手段と制御手段の構成により、系統電源
が停電したことを検知することができる。According to a sixth aspect of the present invention, there is provided the photovoltaic power generation inverter according to the fourth aspect of the present invention, wherein a power failure of the system power supply is detected by the configuration of the power failure detection means, the switch means, the switch time control means and the control means. Can be.
【００１２】請求項７に記載の発明は、請求項３の太陽
光発電インバータに、太陽電池の電圧が急激に変化した
ことを検知する電圧急変検知手段と、蓄電手段と電力急
変スイッチ手段を有しており、太陽を雲等が遮り、日射
の急変による太陽電池の出力電力の急激な低下を太陽電
池の電圧急変検知手段が検知すると、電力急変スイッチ
手段をオフにする。太陽電池からの電力の供給は切れる
が、蓄電手段に蓄えられた電力により系統電源への電流
の注入は継続して行われ、に日射量の急な変化があって
も系統へ継続して電力供給ができる。According to a seventh aspect of the present invention, the photovoltaic power generation inverter according to the third aspect has a voltage sudden change detecting means for detecting a sudden change in the voltage of the solar cell, a power storage means and a power sudden change switch means. When the cloud or the like blocks the sun and the sudden change in the output power of the solar cell due to the sudden change in the solar radiation is detected by the sudden change detecting means of the solar cell, the sudden change power switch is turned off. Although the power supply from the solar cell is cut off, the current stored in the power storage means continues to inject the current into the system power supply, and the power continues to be supplied to the system even if there is a sudden change in the amount of solar radiation. Can supply.
【００１３】[0013]
【実施例】以下本発明の実施例について、図面を参照し
ながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１４】（実施例１）図１は、本発明の第１の実施
例における太陽光発電インバータの構成図を示すもので
ある。図１において、１は太陽電池で、２は太陽電池の
電圧を充電するコンデンサ、３は太陽電池の電圧を検知
する太陽電池電圧検知手段、１０は系統電源の電圧を検
知する系統電圧検知手段、８は制御手段で、その入力は
太陽電池電圧検知手段３と系統電圧検知手段１０に接続
され、制御手段８の出力は、４のスイッチＡ、５のスイ
ッチＢ、６のスイッチＣ、７のスイッチＤの入力に接続
され、スイッチＡとスイッチＣの一端は太陽電池１の正
に、スイッチ４他端は、９のインダクタの一端に接続さ
れ、インダクタス９の他端は１１の系統電源の一端に接
続され、スイッチＡとスイッチＤ及びスイッチＣとスイ
ッチＢは、それぞれ直列接続されスイッチＢとスイッチ
Ｄの一端は太陽電池１の負側に接続され、スイッチＢの
他端は系統電源の一端とスイッチＣの一端に接続されて
いる。(Embodiment 1) FIG. 1 shows a configuration diagram of a photovoltaic power generation inverter according to a first embodiment of the present invention. In FIG. 1, 1 is a solar cell, 2 is a capacitor for charging the voltage of the solar cell, 3 is a solar cell voltage detecting means for detecting the voltage of the solar cell, 10 is a system voltage detecting means for detecting the voltage of the system power supply, Reference numeral 8 denotes a control unit, whose input is connected to the solar cell voltage detection unit 3 and the system voltage detection unit 10, and the output of the control unit 8 is a switch A of 4, a switch B of 5, a switch C of 6, and a switch of 7 One end of switch A and switch C is connected to the positive terminal of solar cell 1, the other end of switch 4 is connected to one end of inductor 9, and the other end of inductor 9 is connected to one end of system power supply 11 And switches A and D and switches C and B are connected in series, respectively, and one end of the switch B and the switch D is connected to the negative side of the solar cell 1, and the other end of the switch B is connected to one end of the system power supply. It is connected to one end of the switch C.
【００１５】以上のように構成された太陽光発電インバ
ータについて、以下その動作、作用を説明する。まず、
制御手段８が、系統電源の電圧の正負を認識する。系統
電圧が正の場合はスイッチＡとスイッチＢを、負電圧の
場合はスイッチＣとスイッチＤを制御できる様にする。
ついで、太陽電池電圧検知手段３が太陽電池１の電圧
と、系統電圧検知手段１０が系統電源１１の電圧を検知
する。その制御手段８がその電圧の大小関係を比較す
る。例えば、図２に示す系統電源が正の場合を考える。
制御回路により４のスイッチＡと５のスイッチＢはＯＮ
に、スイッチＣとスイッチＤはＯＦＦにする。期間ｔ１
とｔ２のように、太陽電池電圧が系統電圧より大きい場
合、太陽電池の正側からの電流はスイッチＡ４からイン
ダクタンス９から系統電源１１を経由してスイッチＢを
経て、太陽電池の負側に帰還され電力が注入される。次
に、図２に示す系統電源が負の場合を考える。制御回路
により４のスイッチＡと５のスイッチＢはＯＦＦに、ス
イッチＣとスイッチＤはＯＮにする。期間ｔ３とｔ４の
ように、太陽電池電圧が系統電圧より大きい場合、太陽
電池の正側からの電流はスイッチＣから系統電源１１を
経由してインダクタンス９からスイッチＤを経て、太陽
電池の負側に帰還され電力が注入される。The operation and operation of the photovoltaic power inverter configured as described above will be described below. First,
The control means 8 recognizes whether the voltage of the system power supply is positive or negative. When the system voltage is positive, the switches A and B can be controlled, and when the system voltage is negative, the switches C and D can be controlled.
Next, the solar cell voltage detecting means 3 detects the voltage of the solar cell 1 and the system voltage detecting means 10 detects the voltage of the system power supply 11. The control means 8 compares the magnitudes of the voltages. For example, consider the case where the system power supply shown in FIG. 2 is positive.
Switch A of 4 and switch B of 5 are turned on by the control circuit
Then, the switches C and D are turned off. Period t1
When the solar cell voltage is higher than the system voltage, as in the case of t2, the current from the positive side of the solar cell returns from the switch A4 to the negative side of the solar cell via the switch B from the inductance 9 via the system power supply 11 to the switch B. Power is injected. Next, consider the case where the system power supply shown in FIG. 2 is negative. The control circuit turns off the switch A of 4 and the switch B of 5 and turns on the switch C and the switch D. When the solar cell voltage is higher than the system voltage, as in periods t3 and t4, the current from the positive side of the solar cell passes from the switch C via the system power supply 11, the inductance 9 via the switch D, and the negative side of the solar cell. And the power is injected.
【００１６】以上のように、本実施例においては、太陽
電池１と、太陽電池の電圧を検知する太陽電池電圧検知
手段３と、系統電源の電圧を検知する系統電圧検知手段
１０を設け、太陽電池１からの電流をインダクタンス９
を介して系統電源１１に流すスイッチＡ，Ｂ，Ｃ，Ｄ
と、太陽電池電圧が系統電源検知より大きい時のみ、イ
ンダクタンスを介して系統電源に流す様にスイッチを制
御する制御手段８を備えることにより、太陽電池１の電
圧を昇圧することなく系統電源１１に電力を注入するこ
とができる。As described above, in this embodiment, the solar cell 1, the solar cell voltage detecting means 3 for detecting the voltage of the solar cell, and the system voltage detecting means 10 for detecting the voltage of the system power supply are provided. The current from battery 1 has an inductance of 9
Switches A, B, C, and D flowing to the system power supply 11 through
And a control means 8 for controlling a switch to flow to the system power supply via an inductance only when the solar cell voltage is higher than the system power supply detection, so that the system power supply 11 can be supplied without increasing the voltage of the solar cell 1. Power can be injected.
【００１７】（実施例２）図３は、本発明の第２の実施
例の太陽光発電インバータの構成図である。(Embodiment 2) FIG. 3 is a configuration diagram of a photovoltaic power inverter according to a second embodiment of the present invention.
【００１８】図３において、実施例１と同じ番号を付与
した構成部品は同じなので説明を省略する。実施例1の
構成と異なるところは１３，１４，１５，１６，１７を
設けた点である。系統電源は１８である。１３はスイッ
チ２で一端は太陽電池の正側に接続され、他端は１５の
インダクタンス２の一端に接続され、インダクタンス２
の他端は、１７の系統電源の一端に接続されている。１
６は１７の系統電源２の電源電圧を検知する系統電圧検
知手段２であり、１４はスイッチ２を制御する制御手段
２である。図３において、１は太陽電池で、２は太陽電
池の電圧を充電するコンデンサ、３は太陽電池の電圧を
検知する太陽電池電圧検知手段、１６は系統電源２の電
圧を検知する系統電圧検知手段２、１４は制御手段２
で、その入力は太陽電池電圧検知手段３と系統電圧検知
手段１６に接続され、制御手段１４の出力は、スイッチ
２の入力に接続されている。In FIG. 3, the same reference numerals as in the first embodiment denote the same parts, and a description thereof will be omitted. The difference from the configuration of the first embodiment is that 13, 14, 15, 16, and 17 are provided. The system power supply is 18. A switch 2 has one end connected to the positive side of the solar cell, the other end connected to one end of the inductance 2, and an inductance 2.
Is connected to one end of 17 system power supplies. 1
Reference numeral 6 denotes a system voltage detecting means 2 for detecting the power supply voltage of the 17 system power supply 2, and 14 denotes a control means 2 for controlling the switch 2. In FIG. 3, 1 is a solar cell, 2 is a capacitor for charging the voltage of the solar cell, 3 is a solar cell voltage detecting means for detecting the voltage of the solar cell, and 16 is a system voltage detecting means for detecting the voltage of the system power supply 2. 2 and 14 are control means 2
The input is connected to the solar cell voltage detecting means 3 and the system voltage detecting means 16, and the output of the control means 14 is connected to the input of the switch 2.
【００１９】以上のように構成された太陽光発電インバ
ータについて、以下その動作、作用を説明する。まず、
制御手段１６が、系統電源の電圧の正負を認識する。系
統電圧が正負の場合に応じて、実施例１で述べたと同様
に、太陽電池の正側からの電流は１３のスイッチ２から
１５のインダクタンス１５から１７の系統電源２を経由
して、太陽電池の負側に帰還され電力が注入される。系
統電源１１と１８が異なるだけで、他は実施例１と同じ
なので省略する。The operation and operation of the photovoltaic power inverter constructed as described above will be described below. First,
The control means 16 recognizes whether the voltage of the system power supply is positive or negative. According to the case where the system voltage is positive or negative, as described in the first embodiment, the current from the positive side of the solar cell passes through the system power supply 2 of the inductances 15 to 17 of the 13 switches 2 to 15 and the solar cell. Is fed back to the negative side of and power is injected. Only the system power supplies 11 and 18 are different, and the other parts are the same as those in the first embodiment, and a description thereof is omitted.
【００２０】さて、実施例１と異なるのは、１７の系統
電源と１８の系統電源２は、単相３線の２つの交流１０
０Ｖの電源であり、実施例１の系統電圧１１は単相３線
の交流２００Ｖ間の電源である点である。The difference from the first embodiment is that the 17 system power supply and the 18 system power supply 2 are two single-phase three-wire ACs.
This is a power supply of 0 V, and the system voltage 11 of the first embodiment is a power supply between a single-phase three-wire AC of 200 V.
【００２１】実施例１では、単相３線の交流２００Ｖで
ある系統電圧１１の最大値は２８２Ｖである。In the first embodiment, the maximum value of the system voltage 11, which is a single-phase three-wire AC 200V, is 282V.
【００２２】実施例２の単相３線の交流１００Ｖである
系統電圧１７と１８の最大値は１４１Ｖである。ところ
で、太陽電池の電圧は、通常２１０Ｖの電圧である。The maximum value of the system voltages 17 and 18 of the second embodiment, which is a single-phase three-wire AC of 100 V, is 141 V. Incidentally, the voltage of the solar cell is usually 210 V.
【００２３】つまり、実施例２の状況では、交流１００
Ｖである系統電圧１７と１８の最大値は１４１Ｖなの
で、図４に示すように系統電源電圧ロは常に太陽電池電
圧イより低い事になる。That is, in the situation of the second embodiment, the AC 100
Since the maximum value of the system voltages 17 and 18 of 141 V is 141 V, the system power supply voltage B is always lower than the solar cell voltage A as shown in FIG.
【００２４】実施例１の様に系統電源周期に応じてスイ
ッチ１２やスイッチ１３をＯＮ、ＯＦＦさせる必要がな
く、太陽電池の電力を系統電源の全周期の間供給でき
る。As in the first embodiment, there is no need to turn on and off the switches 12 and 13 in accordance with the system power supply cycle, and the power of the solar cell can be supplied during the entire system power supply cycle.
【００２５】以上のように、本実施例においては、系統
電源電圧の単相３線の各相間に、請求項１に記載の太陽
光発電インバータを接続することにより、系統電源の電
圧が低下するので、系統電源の周期に応じてスイッチを
ＯＮ、ＯＦＦする必要が無く、太陽電池の電力を系統電
源の全周期の間供給できる。As described above, in the present embodiment, the voltage of the system power supply is reduced by connecting the photovoltaic power generation inverter according to claim 1 between the single-phase three-wire phases of the system power supply voltage. Therefore, there is no need to turn the switches ON and OFF according to the cycle of the system power supply, and the power of the solar cell can be supplied during the entire cycle of the system power supply.
【００２６】（実施例３）図５において、実施例２と同
じ番号を付与した構成部品は同じなので説明を省略す
る。実施例２の構成と異なるところは１８のスイッチ時
間制御手段を設けた点である。１８のスイッチ時間制御
手段は制御手段８の中にあり、スイッチ１２の開閉時間
を制御する。(Embodiment 3) In FIG. 5, the same reference numerals as those in Embodiment 2 denote the same components, and a description thereof will be omitted. The difference from the configuration of the second embodiment is that 18 switch time control means are provided. The switch time control means 18 is included in the control means 8 and controls the open / close time of the switch 12.
【００２７】以上のように構成された太陽光発電インバ
ータについて、以下その動作、作用を説明する。まず、
図６に示すように制御回路８の中のスイッチ時間制御手
段１８により、１２のスイッチがＯＮすると、図４に示
すように太陽電池電圧イが系統電源電圧ロより大きいの
で、インダクタス９を太陽電池から系統電源に電流が流
れ込む。この点を更に、詳しく図６と図７をもとに説明
する。図６の様に期間ｔ１とｔ２の間、スイッチ１２を
ＯＮにする。すると図７に示すように電流I1からI2に変
化する。その次に、図６の様にスッチ１２をオフにす
る。電流はI2から減少し、t3の時点でI3まで減少する。
つまり、スイッチ時間制御手段１８によりスイッチをオ
ンさせることによりインダクタンスの電流を増加させ、
スイッチをオフさせると電流を減少させることができ、
さらに、この時間を制御することにより電流量を制御す
ることができる。The operation and operation of the photovoltaic power inverter configured as described above will be described below. First,
When the switch 12 is turned on by the switch time control means 18 in the control circuit 8 as shown in FIG. 6, the solar cell voltage A is higher than the system power supply voltage B as shown in FIG. Current flows from the battery to the system power supply. This point will be further described in detail with reference to FIGS. As shown in FIG. 6, the switch 12 is turned on between the periods t1 and t2. Then, as shown in FIG. 7, the current changes from I1 to I2. Then, the switch 12 is turned off as shown in FIG. The current decreases from I2 and decreases to I3 at time t3.
That is, by turning on the switch by the switch time control means 18, the current of the inductance is increased,
Turning off the switch can reduce the current,
Further, the amount of current can be controlled by controlling this time.
【００２８】（実施例４）図８は、本発明の第４の実施
例の太陽光発電インバータの構成図である。(Embodiment 4) FIG. 8 is a configuration diagram of a photovoltaic power inverter according to a fourth embodiment of the present invention.
【００２９】図８において、実施例３と同じ番号を付与
した構成部品は同じなので説明を省略する。実施例３の
構成と異なるところは１９の系統電源位相検知手段を設
けた点である。図８において、１９の系統電源位相検知
手段は系統電源間に接続され、その出力は８制御手段に
入力されている。In FIG. 8, the same reference numerals as in the third embodiment denote the same parts, and a description thereof will be omitted. The difference from the configuration of the third embodiment is that 19 system power phase detection units are provided. In FIG. 8, 19 system power supply phase detecting means are connected between the system power supplies, and the output is input to 8 control means.
【００３０】以上のように構成された太陽光発電インバ
ータについて、以下その動作、作用を説明する。まず、
図８の19の系統電源位相検知手段が、11の系統電源の電
圧位相を検知する。その出力は8の制御手段に伝えら
れ、制御手段8は、系統電源の位相に同期して、18のス
イッチ時間制御手段で 12のスイッチのオンオフの時間
を制御する。12のスイッチのオンオフ時間を制御するこ
とにより、9のインダクタンスに流し込む電流の量を制
御することができる。The operation and operation of the photovoltaic power inverter constructed as described above will be described below. First,
The system power supply phase detecting means 19 in FIG. 8 detects the voltage phase of the 11 system power supplies. The output is transmitted to the control means 8, and the control means 8 controls the on / off time of the switches 12 by the switch time control means 18 in synchronization with the phase of the system power supply. By controlling the on / off time of the twelve switches, the amount of current flowing into the inductance of nine can be controlled.
【００３１】つまり、系統電源の位相に応じて、スイッ
チの開閉時間を制御することにより系統に流し込む電流
量を自由に制御できる。That is, the amount of current flowing into the system can be freely controlled by controlling the opening and closing time of the switch according to the phase of the system power supply.
【００３２】たとえば、スイッチ時間制御手段18によ
り、系統に流し込む電流を、系統電源電圧と同じ位相の
正弦波にすることもできる。For example, the switch time control means 18 allows the current flowing into the system to be a sine wave having the same phase as the system power supply voltage.
【００３３】（実施例５）図９は、本発明の第５の実施
例の太陽光発電インバータの構成図である。(Embodiment 5) FIG. 9 is a configuration diagram of a photovoltaic power inverter according to a fifth embodiment of the present invention.
【００３４】図９において、実施例４の図８と同じ番号
を付与した構成部品は同じなので説明を省略する。実施
例４の構成と異なるところは２０の電流検知手段を設け
た点である。電流検知手段２０の一端は、１は太陽電池
の正側に接続され、他端は１２のスイッチ手段の一端に
接続されている。電流検知手段２０の出力は８の制御手
段に入力されている。In FIG. 9, the same reference numerals as in FIG. 8 of the fourth embodiment denote the same components, and a description thereof will be omitted. The difference from the configuration of the fourth embodiment is that 20 current detection units are provided. One end of the current detecting means 20 is connected to the positive side of the solar cell, and the other end is connected to one end of 12 switch means. The output of the current detection means 20 is input to the control means 8.
【００３５】以上のように構成された太陽光発電インバ
ータについて、以下その動作、作用を説明する。まず、
制御手段８が、スイッチ手段１２をオフにする。太陽電
池電圧検知手段３で太陽電池１の電圧を測定し、制御手
段内に記憶する。制御手段８はスイッチ手段１２を短時
間オンし電流を流す。その時の太陽電池の電圧を太陽電
池電圧検知手段で検知し記憶する。前回記憶した電圧と
比較し、電圧が低下していれば、オフのままにする。太
陽電池電圧が低下しないか、大きくなっていれば制御手
段８はスイッチ手段１２をさらに長時間オンし電流を流
す。そしてまた、太陽電池電圧検知手段３で太陽電池１
の電圧を測定し、上記動作を繰り返す。The operation and operation of the photovoltaic power inverter configured as described above will be described below. First,
The control means 8 turns off the switch means 12. The voltage of the solar cell 1 is measured by the solar cell voltage detecting means 3 and stored in the control means. The control means 8 turns on the switch means 12 for a short time to flow a current. The voltage of the solar cell at that time is detected and stored by the solar cell voltage detecting means. If the voltage is lower than the previously stored voltage, it is kept off. If the solar cell voltage does not decrease or increases, the control means 8 turns on the switch means 12 for a longer period of time to flow a current. Further, the solar cell 1 is detected by the solar cell voltage detecting means 3.
Is measured, and the above operation is repeated.
【００３６】このように電圧が変化しなければ、電流を
大きくしていくので、太陽電池から徐々に大きな電力を
引き出していることになり、最大電力に到達すると、そ
れ以上の電流を流すのを停止し、常に最大電力を引き出
すようにしている。If the voltage does not change in this manner, the current is increased, so that a large amount of electric power is gradually drawn from the solar cell. When the maximum electric power is reached, the flow of more electric current is prevented. It stops and always draws the maximum power.
【００３７】以上のように、本実施例においては、太陽
電池の電圧と電流を常に計測し、最大の電力を引き出す
ことが出来る。As described above, in this embodiment, the maximum power can be extracted by constantly measuring the voltage and the current of the solar cell.
【００３８】（実施例６）図１０は、本発明の第６の実
施例の太陽光発電インバータの構成図である。(Embodiment 6) FIG. 10 is a configuration diagram of a photovoltaic power inverter according to a sixth embodiment of the present invention.
【００３９】図１０において、実施例４の図５と同じ番
号を付与した構成部品は同じなので説明を省略する。実
施例４の構成と異なるところは２１の停電検知手段を設
けた点である。停電検知手段２１の入力は、系統電源電
圧検知手段１０に接続され、停電検知手段２１の出力は
スイッチ時間制御手段１８に接続されている。In FIG. 10, the same reference numerals as in FIG. 5 of the fourth embodiment denote the same components, and a description thereof will be omitted. The difference from the configuration of the fourth embodiment is that 21 power failure detection means are provided. The input of the power failure detection means 21 is connected to the system power supply voltage detection means 10, and the output of the power failure detection means 21 is connected to the switch time control means 18.
【００４０】以上のように構成された太陽光発電インバ
ータについて、以下その動作、作用を説明する。まず、
実施例４では、系統電源の電圧の位相に同期した電流を
系統に注入している。その電流を停電検知手段２１によ
り、スイッチ時間制御手段１８によりスイッチ手段１２
を制御して、図１１に示すように系統電源電圧の位相の
特定の期間t5から電流波形を変える。つまり系統へは図
１１の電流波形で系統電源に注入されている。The operation and operation of the photovoltaic power inverter configured as described above will be described below. First,
In the fourth embodiment, a current synchronized with the phase of the voltage of the system power supply is injected into the system. The current is detected by the power failure detection means 21 and the switch time control means 18 by the switch means 12.
To change the current waveform from a specific period t5 of the phase of the system power supply voltage as shown in FIG. That is, the current is injected into the system with the current waveform shown in FIG.
【００４１】この状態で系統電源１１が停電すると、系
統電源電圧がなくなる。しかし、太陽光発電システムか
ら図１１の電流が流れこむ。系統電源１１に抵抗負荷が
接続されていると、この電流波形と同じ電圧が系統に発
生する。すると、停電検知手段２１は、太陽光発電シス
テムから系統に注入した電流波形と同じ電圧波形が発生
したことを検知し停電したと判断して、スイッチ手段１
２をオフさせる。In this state, if the system power supply 11 fails, the system power supply voltage is lost. However, the current of FIG. 11 flows from the solar power generation system. If a resistive load is connected to the system power supply 11, the same voltage as the current waveform is generated in the system. Then, the power failure detection means 21 detects that the same voltage waveform as the current waveform injected from the photovoltaic power generation system into the power system has been generated, and determines that the power failure has occurred.
Turn 2 off.
【００４２】以上のように、本実施例においては、停電
検知手段２１により、系統電源１１が停電したことを検
知し、発電を停止することができる。As described above, in the present embodiment, the power failure detecting means 21 can detect that the system power supply 11 has lost power and stop power generation.
【００４３】（実施例７）図１２は、本発明の第７の実
施例の太陽光発電インバータの構成図である。(Embodiment 7) FIG. 12 is a configuration diagram of a photovoltaic power inverter according to a seventh embodiment of the present invention.
【００４４】図１２において、実施例３の図５と同じ番
号を付与した構成部品は同じなので説明を省略する。実
施例３の構成と異なるところは、２２の蓄電手段である
コンデンサと、２３の電圧急変検知手段と、２４の電力
急変スイッチ手段を設けた点である。電圧急変検知手段
２３は太陽電池の両端に接続され、電力急変スイッチ手
段２４の一端は太陽電池の正側に、他端はスイッチ手段
１２の一端に接続されている。中間コンデンサ２２はス
イッチ手段１２の一端に、中間コンデンサ２２の他端は
太陽電池の負側に接続されている。太陽電池電圧検知手
段３は中間コンデンサ２２の両端に接続されている。In FIG. 12, the same reference numerals as in FIG. 5 of the third embodiment denote the same parts, and a description thereof will be omitted. The difference from the configuration of the third embodiment is that a capacitor 22 serving as a power storage unit, a sudden change detection unit 23 is provided, and a sudden change switch unit 24 is provided. The sudden voltage change detecting means 23 is connected to both ends of the solar cell. One end of the sudden power change switch means 24 is connected to the positive side of the solar cell, and the other end is connected to one end of the switch means 12. The intermediate capacitor 22 is connected to one end of the switch means 12, and the other end of the intermediate capacitor 22 is connected to the negative side of the solar cell. The solar cell voltage detecting means 3 is connected to both ends of the intermediate capacitor 22.
【００４５】以上のように構成された太陽光発電インバ
ータについて、以下その動作、作用を説明する。太陽を
雲等が遮り、日射の急変による太陽電池２の出力電圧の
急激な低下を太陽電池の電圧急変検知手段２３が検知す
ると、電力急変スイッチ手段２４をオフにする。太陽電
池２からの電力の供給は切れるが、蓄電手段２２のコン
デンサに蓄えられた電力により系統電源１１への電流の
注入は継続して行われ、日射量の急な変化があっても系
統へ継続して電力供給ができる。 以上のように、本実
施例においては、電圧急変検知手段２３により、太陽電
池１の電圧が急激に変化したことを検知し、電力急変ス
イッチ手段２４により電力供給を停止し、代わりに蓄電
手段２２で系統への電力供給を継続する。The operation and operation of the photovoltaic power inverter constructed as described above will be described below. When a cloud or the like interrupts the sun and the sudden change in the output voltage of the solar cell 2 due to a sudden change in the solar radiation is detected by the sudden change detecting means 23 of the solar cell, the sudden change power switch 24 is turned off. Although the supply of power from the solar cell 2 is cut off, current is continuously injected into the system power supply 11 by the power stored in the capacitor of the power storage means 22, and even if there is a sudden change in the amount of solar radiation, the system can be supplied to the system. Power can be supplied continuously. As described above, in the present embodiment, the sudden change in the voltage of the solar cell 1 is detected by the sudden change detecting unit 23, the power supply is stopped by the sudden change switch unit 24, and the electric storage unit 22 is replaced. To continue power supply to the grid.
【００４６】また、太陽の日射量が増え太陽電池１の電
圧が所定の値に復帰すれば、電圧急変検知手段２３は電
力急変スイッチ手段２４をオンして、実施例３の動作に
て系統に電流を注入する。Further, when the amount of solar radiation increases and the voltage of the solar cell 1 returns to a predetermined value, the sudden voltage change detecting means 23 turns on the sudden electric power change switch means 24, and the voltage of the solar cell 1 is changed to the system by the operation of the third embodiment. Inject current.
【００４７】[0047]
【発明の効果】以上のように、請求項１に記載の発明に
よれば、太陽電池１の電圧を昇圧することなく系統電源
１１に電力を注入することができる。As described above, according to the first aspect of the present invention, power can be injected into the system power supply 11 without increasing the voltage of the solar cell 1.
【００４８】また、請求項２に記載の発明によれば、太
陽電池の電力を系統電源の全周期の間供給できる。According to the second aspect of the present invention, the power of the solar cell can be supplied during the entire period of the system power supply.
【００４９】また、請求項３に記載の発明によれば、太
陽電池の発電電力から、系統電源に電流を調整して流し
込める。According to the third aspect of the present invention, the electric power can be adjusted and supplied from the power generated by the solar cell to the system power supply.
【００５０】また、請求項４に記載の発明によれば、ス
イッチ時間制御手段により、系統に流し込む電流を、系
統電源電圧と同じ位相の正弦波にすることもできる。According to the fourth aspect of the present invention, the current flowing into the system can be a sine wave having the same phase as the system power supply voltage by the switch time control means.
【００５１】また、請求項５に記載の発明によれば、太
陽電池の電圧と電流を常に計測し、最大の電力を引き出
すことが出来る。According to the fifth aspect of the present invention, it is possible to always measure the voltage and the current of the solar cell and to extract the maximum power.
【００５２】また、請求項６に記載の発明によれば、停
電検知手段により、系統電源が停電したことを検知し、
発電を停止することができる。In addition, according to the invention as set forth in claim 6, the power failure detecting means detects that the system power supply has failed,
Power generation can be stopped.
【００５３】また、請求項７に記載の発明によれば、太
陽を雲等が遮り、日射の急変による太陽電池の出力電圧
の急激な低下を太陽電池の電圧急変検知手段が検知し、
電力急変スイッチ手段により太陽電池からの電力供給の
代わりに蓄電手段により電力供給を行い、日射の急変に
よっても安定した系統へ電力を供給できる。According to the seventh aspect of the present invention, a sudden drop in the output voltage of the solar cell caused by a sudden change in solar radiation is detected by a sudden change in the voltage of the solar cell.
Power supply is performed by the power storage means instead of the power supply from the solar cell by the power sudden change switch means, and power can be supplied to a stable system even by sudden change of solar radiation.
【図１】本発明の実施例１における太陽光発電インバー
タの構成図FIG. 1 is a configuration diagram of a photovoltaic power generation inverter according to a first embodiment of the present invention.
【図２】同、太陽光発電インバータの動作波形図FIG. 2 is an operation waveform diagram of the photovoltaic power generation inverter.
【図３】本発明の実施例２における太陽光発電インバー
タの構成図FIG. 3 is a configuration diagram of a photovoltaic power generation inverter according to a second embodiment of the present invention.
【図４】同、太陽光発電インバータの動作波形図FIG. 4 is an operation waveform diagram of the photovoltaic power inverter.
【図５】本発明の実施例３における太陽光発電インバー
タの構成図FIG. 5 is a configuration diagram of a photovoltaic power generation inverter according to a third embodiment of the present invention.
【図６】同、太陽光発電インバータの制御波形図FIG. 6 is a control waveform diagram of the photovoltaic power generation inverter.
【図７】同、太陽光発電インバータのコイル電流の状態
波形図FIG. 7 is a state waveform diagram of the coil current of the photovoltaic power inverter.
【図８】本発明の実施例４における太陽光発電インバー
タの構成図FIG. 8 is a configuration diagram of a photovoltaic power generation inverter according to a fourth embodiment of the present invention.
【図９】本発明の実施例５における太陽光発電インバー
タの構成図FIG. 9 is a configuration diagram of a photovoltaic power inverter according to a fifth embodiment of the present invention.
【図１０】本発明の実施例６における太陽光発電インバ
ータの構成図FIG. 10 is a configuration diagram of a photovoltaic power generation inverter according to a sixth embodiment of the present invention.
【図１１】同、太陽光発電インバータの動作波形図FIG. 11 is an operation waveform diagram of the photovoltaic power inverter.
【図１２】本発明の実施例７における太陽光発電インバ
ータの構成図FIG. 12 is a configuration diagram of a photovoltaic power inverter according to a seventh embodiment of the present invention.
【図１３】従来のインバータの構成図FIG. 13 is a configuration diagram of a conventional inverter.
１ 太陽電池 ２ コンデンサ ３ 太陽電池電圧検知手段 ４ スイッチA ５ スイッチB ６ スイッチC ７ スイッチD ８ 制御手段 ９ インダクタンス １０ 系統電圧検知手段 １１ 系統電源 １２ スイッチ手段 DESCRIPTION OF SYMBOLS 1 Solar cell 2 Capacitor 3 Solar cell voltage detection means 4 Switch A 5 Switch B 6 Switch C 7 Switch D 8 Control means 9 Inductance 10 System voltage detection means 11 System power supply 12 Switch means
Claims (7)
太陽電池電圧検知手段と、太陽電池から系統連系電源に
電流を流し込むインダクタンスと、系統電源の電圧を検
知する系統電圧検知手段と、太陽電池からの電流をイン
ダクタンスを介して系統に流すスイッチと、太陽電池電
圧が系統電源検知より大きい時のみ、インダクタンスを
介して系統電源に流す様にスイッチを制御する制御手段
を備えてなる太陽光発電インバータ。1. A solar cell, a solar cell voltage detecting means for detecting a voltage of the solar cell, an inductance for flowing a current from the solar cell to a system interconnection power supply, and a system voltage detecting means for detecting a voltage of the system power supply. A solar light comprising a switch for flowing a current from a solar cell to a system via an inductance and a control means for controlling the switch to flow to a system power via the inductance only when the solar cell voltage is higher than the system power supply detection. Power generation inverter.
と、他の相間に接続してなる請求項１記載の太陽光発電
インバータ。2. The photovoltaic power generation inverter according to claim 1, wherein the photovoltaic power generation inverter is connected between one phase of the single-phase three-wire system voltage and another phase.
イッチ開閉時間制御手段を設けて、系統電源に流し込む
電流量を調整してなる請求項１記載の太陽光発電インバ
ータ。3. The photovoltaic power generation inverter according to claim 1, wherein the switch means is provided with a switch opening / closing time control means for controlling the opening / closing time to adjust the amount of current flowing into the system power supply.
位相検知手段を設けてなる請求項３記載の太陽光発電イ
ンバータ。4. The photovoltaic power generation inverter according to claim 3, further comprising a power supply voltage phase detecting means for detecting a phase of a system power supply voltage.
の太陽光発電インバータ。5. The photovoltaic power generation inverter according to claim 3, further comprising current detection means.
してなる請求項４記載の太陽光発電インバータ。6. The photovoltaic power generation inverter according to claim 4, further comprising a power failure detection means for detecting a power failure of the power supply.
検知する電圧急変検知手段と、蓄電手段を有してなる請
求項３記載の太陽光発電インバータ。7. The photovoltaic power generation inverter according to claim 3, further comprising a sudden voltage change detecting means for detecting a sudden change in the voltage of the solar cell, and a power storage means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001142784A JP2002345155A (en) | 2001-05-14 | 2001-05-14 | Photovoltaic power generating inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001142784A JP2002345155A (en) | 2001-05-14 | 2001-05-14 | Photovoltaic power generating inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002345155A true JP2002345155A (en) | 2002-11-29 |
Family
ID=18989021
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009128217A1 (en) * | 2008-04-15 | 2009-10-22 | パナソニック株式会社 | Switching power supply apparatus |
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| WO2009128217A1 (en) * | 2008-04-15 | 2009-10-22 | パナソニック株式会社 | Switching power supply apparatus |
| JP2009261073A (en) * | 2008-04-15 | 2009-11-05 | Panasonic Corp | Switching power supply apparatus |
| US8456879B2 (en) | 2008-04-15 | 2013-06-04 | Panasonic Corporation | Switching power supply apparatus |
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