JPH10112989A - Starting method of inverter for solar battery - Google Patents

Starting method of inverter for solar battery

Info

Publication number
JPH10112989A
JPH10112989A JP8261081A JP26108196A JPH10112989A JP H10112989 A JPH10112989 A JP H10112989A JP 8261081 A JP8261081 A JP 8261081A JP 26108196 A JP26108196 A JP 26108196A JP H10112989 A JPH10112989 A JP H10112989A
Authority
JP
Japan
Prior art keywords
inverter
voltage
solar cell
command value
vdc
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
Application number
JP8261081A
Other languages
Japanese (ja)
Other versions
JP3632322B2 (en
Inventor
Noboru Takada
高田　　昇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP26108196A priority Critical patent/JP3632322B2/en
Publication of JPH10112989A publication Critical patent/JPH10112989A/en
Application granted granted Critical
Publication of JP3632322B2 publication Critical patent/JP3632322B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent surge of an output current when an inverter for a solar battery is started. SOLUTION: In an inverter for a solar battery which is provided with a voltage control part, a DC voltage command value VDC* is set nearly equal to a DC voltage VDCO in the state of no load, before starting, and then the inverter is started. Since the DC voltage VDCDET of the inverter is controlled to the nearly equal to VDCO, the generation power PDC becomes PO≈0. Next, VDC* is gradually decreased from VDCO, and PDC is increased. When VDC* is decreased down to the optimum voltage VDCOPT wherein the solar battery outputs the maximum generation power PMAX, the decrease of VDC* is stopped, and operation is continued in the state of VDC*=VDCOPT. By this method, the generation power can be gradually increased from PO up to PMAX, so that stable staring operation without surge of the output current is enabled.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、太陽電池の直流発
電電力を交流に変換して、連系した商用電源に電力を供
給する太陽電池用インバータの始動方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting an inverter for a solar cell, which converts a DC power generated by a solar cell into an alternating current and supplies the power to an interconnected commercial power supply.

【０００２】[0002]

【従来の技術】図１に太陽電池用インバータの構成を示
す。図中、１は太陽電池、２はインバータ、２０はイン
バータの制御部、Ｓはインバータと連系する系統側（商
用電源）、ＡＣＬはインバータに接続された交流リアク
トル、ＴＲはインバータの出力電圧を系統側電圧と一致
させるトランス、Ｌは負荷である。2. Description of the Related Art FIG. 1 shows a configuration of a solar cell inverter. In the figure, 1 is a solar cell, 2 is an inverter, 20 is a control unit of the inverter, S is a system side (commercial power supply) connected to the inverter, ACL is an AC reactor connected to the inverter, and TR is the output voltage of the inverter. A transformer L to be matched with the system side voltage is a load.

【０００３】インバータの制御部２０は、直流電圧指令
値ＶDC＊と直流電圧（検出値）ＶDCDETとの偏差をＰＩ
演算する電圧制御アンプ（電圧制御部）２１と、このア
ンプの出力信号に計器用変圧器ＰＴ1で検出した出力電
圧Ｖoutを掛けて電流指令値ＩP＊を出力する乗算器２３
と、この電流指令値ＩP＊と変流器ＣＴ1で検出した出力
電流Ｉdetとの偏差を検出する減算器２５と、この偏差
信号と出力電圧Ｖoutを受けてゲート基準信号を出力す
る力率制御部２６と、このゲート基準信号と三角波発生
器２７からの三角波からＰＷＭ制御信号を出力するコン
パレータ２８と、このＰＷＭ制御信号を受けてインバー
タのゲートを制御するゲートロジック回路２９で構成さ
れている。[0003] The control unit 20 of the inverter calculates a deviation between the DC voltage command value VDC * and the DC voltage (detected value) VDCDET by PI.
A voltage control amplifier (voltage control unit) 21 for calculating, and a multiplier 23 for multiplying an output signal of the amplifier by an output voltage V out detected by the instrument transformer PT 1 to output a current command value IP *.
And a subtractor 25 for detecting a deviation between the current command value I P * and the output current I det detected by the current transformer CT 1 , and receiving the deviation signal and the output voltage V out to output a gate reference signal. A power factor control unit 26, a comparator 28 that outputs a PWM control signal from the gate reference signal and the triangular wave from the triangular wave generator 27, and a gate logic circuit 29 that receives the PWM control signal and controls the gate of the inverter. ing.

【０００４】制御部２０は電圧制御部２１により直流電
圧ＶDCDETが直流電圧指令値ＶDC＊と一致するようにイ
ンバータ２を制御する。太陽電池１の直流発電電力ＰDC
はインバータ２で交流電力ＰACに変換され、系統側Ｓに
供給される。The control unit 20 controls the inverter 2 by the voltage control unit 21 so that the DC voltage V DCDET matches the DC voltage command value V DC *. DC power generated by solar cell 1 P DC
Is converted into AC power P AC by the inverter 2 and supplied to the system side S.

【０００５】太陽電池は、図２に示すような電圧−電力
特性を持っている。よって太陽電池の発電電力ＰDCは直
流電圧ＶDCDETによって決定される。図２の特性よりイ
ンバータは直流電圧ＶDCDETを太陽電池の最大発電電力
ＰMAXとなる最適点電圧ＶDCOPTに制御し、交流電力ＰAC
＝ＰMAXとなるように運転することが望ましい。そのた
め、従来、太陽電池用インバータは一般に、直流電圧指
令値ＶDC＊＝ＶDCOPTとして運転している。A solar cell has a voltage-power characteristic as shown in FIG. Therefore, the generated power P DC of the solar cell is determined by the DC voltage V DCDET . From the characteristics of FIG. 2, the inverter controls the DC voltage V DCDET to the optimum point voltage V DCOPT which becomes the maximum generated power P MAX of the solar cell, and the AC power P AC
It is desirable to operate so that = P MAX . Therefore, conventionally, a solar cell inverter has generally been operated as a DC voltage command value V DC * = V DCOPT .

【０００６】[0006]

【発明が解決しようとする課題】ところで、上記従来の
ように、常時直流電圧を最適点電圧に制御する方式で
は、インバータ始動時、日射量が多く太陽電池がほぼ定
格値を発電する場合、インバータ始動後、太陽電池はす
ぐ最大電力を発電するので、インバータの出力が急上昇
し、それが原因で、インバータの停止または故障が発生
するという問題があった。By the way, in the conventional method of always controlling the DC voltage to the optimum point voltage as described above, when the solar irradiance is large at the start of the inverter and the solar cell generates almost the rated value, the inverter is not operated. Since the solar cell immediately generates the maximum power after the start, the output of the inverter sharply rises, which causes a problem that the inverter stops or fails.

【０００７】本発明は、従来のこのような問題点に鑑み
てなされたものであり、その目的とするところは、イン
バータ始動時の出力電流の急上昇がなくなり、安定した
始動運転ができる太陽電池用インバータの始動方法を提
供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and an object of the present invention is to prevent a sudden increase in the output current at the time of starting the inverter and to provide a stable starting operation for a solar cell. An object of the present invention is to provide a method for starting an inverter.

【０００８】[0008]

【課題を解決するための手段】本発明は、インバータの
始動前に、インバータの直流電圧指令値を太陽電池の無
負荷状態の直流電圧とほぼ等しく設定してインバータを
始動し、始動後、前記直流電圧指令値を徐々に減少させ
て、太陽電池の発電電力を徐々に増大させ、この指令値
が太陽電池の最大発電電力を出力する最適点電圧まで減
少した時、この指令値の減少を停止して直流電圧指令値
一定で運転する。これにより始動時に発電電力を無負荷
状態から徐々に最大発電電力まで上昇させることが可能
になり、始動時の出力電流の急上昇がなくなる。According to the present invention, before starting the inverter, the DC voltage command value of the inverter is set substantially equal to the DC voltage of the solar cell in a no-load state, and the inverter is started. The DC voltage command value is gradually reduced, the power generated by the solar cell is gradually increased, and when this command value decreases to the optimal point voltage at which the maximum power output of the solar cell is output, the reduction of this command value is stopped. And operate with a constant DC voltage command value. This makes it possible to gradually increase the generated power from the no-load state to the maximum generated power at the time of startup, and eliminate a sudden increase in the output current at startup.

【０００９】[0009]

【発明の実施の形態】従来図１の太陽電池用インバータ
において、インバータを以下のように制御する。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the conventional solar cell inverter shown in FIG. 1, the inverter is controlled as follows.

【００１０】まず、インバータ始動前に、インバータの
直流電圧指令値ＶDC＊を図２の太陽電池特性の直流電圧
ＶDCOとほぼ等しく設定する。First, before starting the inverter, the DC voltage command value V DC * of the inverter is set to be substantially equal to the DC voltage V DCO of the solar cell characteristic shown in FIG.

【００１１】次に、この直流電圧指令値ＶDC＊≒ＶDCO
の設定でインバータを始動する。インバータの直流電圧
ＶDCDETは指令値ＶDC＊と等しくなるように制御される
ので、直流電圧ＶDCDETは、ＶDCDET＝ＶDC＊＝ＶDCOに
制御される。Next, the DC voltage command value V DC * ≒ V DCO
Start the inverter with the setting of. Since DC voltage V DCDET of the inverter is controlled to be equal to command value V DC *, DC voltage V DCDET is controlled to V DCDET = V DC * = V DCO .

【００１２】この直流電圧ＶDCOはインバータ運転前の
無負荷状態の太陽電池の直流電圧値と等しいので、図２
の太陽電池の電圧−電力特性より、この時の太陽電池の
発電電力ＰDCはＰ0≒０となる。よって、インバータの
運転後も、太陽電池は殆ど発電電力を出力しないので、
インバータへ入力する直流電力ＰDC≒０となり、インバ
ータから出力される交流電力ＰAC≒０となる。Since this DC voltage V DCO is equal to the DC voltage value of the solar cell in a no-load state before the inverter operation, FIG.
From the voltage-power characteristics of the solar cell, the generated power P DC of the solar cell at this time is P 0 ≒ 0. Therefore, even after the operation of the inverter, since the solar cell hardly outputs generated power,
DC power P DC ≒ 0 input to the inverter is obtained, and AC power P AC ≒ 0 output from the inverter is obtained.

【００１３】この始動後、直流電圧指令値ＶDC＊をＶ
DCOから徐々に減少させる。直流電圧指令値ＶDC＊が徐
々に減少すると直流電圧ＶDCDETは太陽電池の無負荷状
態の電圧ＶDCOから徐々に減少し、図２に矢印で示すよ
うに、太陽電池の発電電力ＰDCは徐々に増加し、インバ
ータの出力する交流電力ＰACも増加する。After the start, the DC voltage command value V DC * is changed to V
Gradually decrease from DCO . DC voltage V DCDET the DC voltage command value V DC * is gradually decreased gradually decreases from the voltage V DCO unloaded state of the solar cell, as shown by the arrows in FIG. 2, the generated power P DC of the solar cell The power gradually increases, and the AC power P AC output from the inverter also increases.

【００１４】直流電圧ＶDCDETが図２の太陽電池の最適
点電圧ＶDCOPTと等しくなった時、直流電圧指令値ＶDC
＊の減少を停止して一定の直流電圧指令値ＶDC＊＝Ｖ
DCOPTでインバータを運転する。直流電圧ＶDCDETはＶDC
＊＝ＶDCOPTに制御されるので、太陽電池は最適点電圧
ＶDCOPTで最大電力ＰMAXを発電する。When the DC voltage V DCDET becomes equal to the optimum point voltage V DCOPT of the solar cell in FIG. 2, the DC voltage command value V DC
* Stop decreasing and keep the DC voltage command value V DC * = V
Operate the inverter with DCOPT . DC voltage VDCDET is VDC
* = V DCOPT , so that the solar cell generates the maximum power P MAX at the optimum point voltage V DCOPT .

【００１５】上記インバータの始動により発電電力ＰDC
は図３のようにＰ0からＰMAXに徐々に変化するので、始
動時にインバータの電流値が急上昇することはない。When the inverter is started, the generated power P DC
Because gradually changes P MAX from P 0 as shown in FIG. 3, the current value of the inverter is not able to jump at startup.

【００１６】[0016]

【発明の効果】本発明によれば、インバータ始動時に太
陽電池の発電電力の急上昇がなくなり、安定したインバ
ータの始動運転が可能となる。According to the present invention, the power generated by the solar cell does not sharply increase at the time of starting the inverter, and the starting operation of the inverter can be stably performed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】太陽電池用インバータのシステム構成図。FIG. 1 is a system configuration diagram of a solar cell inverter.

【図２】太陽電池特性を示す線図。FIG. 2 is a diagram showing solar cell characteristics.

【図３】本発明方法によるインバータ始動時の発電電力
の変化を示す線図。FIG. 3 is a diagram showing a change in generated power at the time of starting an inverter according to the method of the present invention.

【符号の説明】[Explanation of symbols]

１…太陽電池 ２…インバータ ２０…インバータの制御部 ２１…直流電圧制御アンプ（直流電圧制御部） ２６…力率制御部 ２８…ＰＷＭ制御用コンパレータ ２９…ゲートロジック回路 ＴＲ…トランス Ｌ…負荷 Ｓ…系統側（商用電源） ＶDC＊…インバータの直流電圧指令値 ＶDCDET…インバータの直流電圧（検出値） ＶDCO…太陽電池の無負荷状態の電圧 ＶDCOPT…太陽電池の発電電力が最大となる最適点電圧 ＰDC…太陽電池の発電電力 ＰAC…インバータの出力する交流電力 ＰMAX…太陽電池の最大発電電力 Ｐ0…太陽電池の電圧ＶDCO時の発電電力DESCRIPTION OF SYMBOLS 1 ... Solar cell 2 ... Inverter 20 ... Inverter control part 21 ... DC voltage control amplifier (DC voltage control part) 26 ... Power factor control part 28 ... PWM control comparator 29 ... Gate logic circuit TR ... Transformer L ... Load S ... System side (commercial power supply) V DC *… Inverter DC voltage command value V DCDET … Inverter DC voltage (detection value) V DCO … No-load voltage of solar cell V DCOPT … Maximum power generated by solar cell Optimal point voltage P DC … Power generated by solar cell P AC … AC power output from inverter P MAX … Maximum generated power of solar cell P 0 … Power generated at solar cell voltage V DCO

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 制御部に直流電圧制御部を備えた太陽電
池用インバータの始動方法であって、 始動前に、インバータの直流電圧指令値を太陽電池の無
負荷状態の直流電圧とほぼ等しく設定してインバータを
始動し、 始動後、前記直流電圧指令値を徐々に減少させ、この指
令値が太陽電池の最大発電電力を出力する最適点電圧と
ほぼ等しくなった時、この指令値の減少を停止して直流
電圧指令値一定で運転する、ことを特徴とした太陽電池
用インバータの始動方法。1. A method for starting a solar cell inverter having a DC voltage control unit in a control unit, wherein a DC voltage command value of the inverter is set to be substantially equal to a DC voltage of the solar cell in a no-load state before starting. After starting, the DC voltage command value is gradually decreased. When the command value becomes substantially equal to the optimum point voltage at which the maximum power output of the solar cell is output, the decrease of the command value is performed. A method for starting a solar cell inverter, comprising: stopping and operating with a constant DC voltage command value.
JP26108196A 1996-10-02 1996-10-02 Starting method of inverter for solar cell Expired - Fee Related JP3632322B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26108196A JP3632322B2 (en) 1996-10-02 1996-10-02 Starting method of inverter for solar cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26108196A JP3632322B2 (en) 1996-10-02 1996-10-02 Starting method of inverter for solar cell

Publications (2)

Publication Number Publication Date
JPH10112989A true JPH10112989A (en) 1998-04-28
JP3632322B2 JP3632322B2 (en) 2005-03-23

Family

ID=17356826

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26108196A Expired - Fee Related JP3632322B2 (en) 1996-10-02 1996-10-02 Starting method of inverter for solar cell

Country Status (1)

Country Link
JP (1) JP3632322B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012066005A3 (en) * 2010-11-17 2012-08-23 Sma Solar Technology Ag Method for connecting a photovoltaic installation to a power supply grid
JP2018137943A (en) * 2017-02-23 2018-08-30 東洋電機製造株式会社 System linkage inverter device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012066005A3 (en) * 2010-11-17 2012-08-23 Sma Solar Technology Ag Method for connecting a photovoltaic installation to a power supply grid
US10027249B2 (en) 2010-11-17 2018-07-17 Sma Solar Technology Method for connecting a photovoltaic installation to a power supply
JP2018137943A (en) * 2017-02-23 2018-08-30 東洋電機製造株式会社 System linkage inverter device

Also Published As

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