JPS60234468A - Method of controlling inverter - Google Patents

Method of controlling inverter

Info

Publication number
JPS60234468A
JPS60234468A JP59089818A JP8981884A JPS60234468A JP S60234468 A JPS60234468 A JP S60234468A JP 59089818 A JP59089818 A JP 59089818A JP 8981884 A JP8981884 A JP 8981884A JP S60234468 A JPS60234468 A JP S60234468A
Authority
JP
Japan
Prior art keywords
output
power
power source
inverter
operating point
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
JP59089818A
Other languages
Japanese (ja)
Other versions
JPH0654452B2 (en
Inventor
Hitoshi Tamura
仁志 田村
Kunio Tanaka
邦穂 田中
Kazufumi Ushijima
牛嶋　和文
Yasuhiro Makino
康弘 牧野
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki 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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP59089818A priority Critical patent/JPH0654452B2/en
Publication of JPS60234468A publication Critical patent/JPS60234468A/en
Publication of JPH0654452B2 publication Critical patent/JPH0654452B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To control the AC output power at a high speed to the maximum by detecting an AC output power, moving a reference operation point in a direction for increasing the power, and following the operation point of the power source to the reference operation point. CONSTITUTION:A DC output power PDC from a solar battery power source as a DC power source 1 is converted by an inverter 2 into an AC output PAC, and output. This AC output power PAC is detected by a transducer 3, and a reference operation voltage Vref to be supplied to the power source 1 is generated by a controller 5 through a sampler 4. Thus, the voltage V of the power source 1 follows the reference operation voltage Vref to generate a DC output power PDC. The controller 5 inputs the output of the transducer 3 at a sampling period T, calculates and outputs the reference operation voltage Vref, and then regulates the outputs of the power source 1 and the transducer 3 up to the next sampling time.

Description

【発明の詳細な説明】 くイ）産業上の利用分野 本発明は、太陽電池を電源とし、その直流出力から交流
出力を取出すためのインバータに係り、その変換効率を
最大にするための制御方法に関するものである。[Detailed description of the invention] B) Industrial application field The present invention relates to an inverter that uses a solar cell as a power source and extracts an AC output from its DC output, and a control method for maximizing its conversion efficiency. It is related to.

（ロ）従来技術 従来のマイクロコンピュータ制御による太陽電池電力変
換システムでは、直流電源側の出力電力を最大にするよ
うな制御方法がとられている（例えば１太陽光発電シス
テムにおけるエネルギーフロー制御」電気学会、半導体
電力変換研究会予稿集５ｐｃ−８４−を参照）。これは
交流電力の算出には三角関数を必要とし、処理時間と記
憶容量の点でマイクロコンピュータには負担が太きすぎ
、また交流電力検出用のトランスデユーサでは応答が遅
く高速度での制御が望めないという問題かあるのに対し
て、直流電力ならば乗算のみで簡単に算出できるという
利点があるからである。(b) Prior art In conventional microcomputer-controlled solar battery power conversion systems, a control method is used to maximize the output power on the DC power supply side (for example, 1. Energy flow control in a solar power generation system). (Refer to Proceedings of the Semiconductor Power Conversion Study Group, 5pc-84-). This requires trigonometric functions to calculate AC power, which places too much burden on a microcomputer in terms of processing time and storage capacity, and the transducer for AC power detection has a slow response and cannot be controlled at high speed. This is because DC power has the advantage that it can be easily calculated using only multiplication, whereas there is a problem that it is not possible to obtain .

しかしながら、電力変換の過程では必ず電力損失を伴う
為直流出力電力を最大にしても変換後の交流出力電力が
同時に最大になるとは限らない。However, the process of power conversion always involves power loss, so even if the DC output power is maximized, the AC output power after conversion does not always reach the maximum at the same time.

従って電力の有効利用の見地からは、電源の直流出力で
なくインバータの交流出力に対して出力電力を最大にす
る制御を行なうほうが良いが上述の如き交流電力検出に
おける問題があって行なわれていない。Therefore, from the standpoint of effective use of power, it would be better to perform control to maximize the output power of the inverter's AC output rather than the DC output of the power supply, but this has not been done due to the problems with AC power detection mentioned above. .

（ハ）発明の目的 本発明は上述の如き従来技術の問題点に鑑みて成された
ものであり、応答速度の遅い交ｉ電力検出用トランステ
ユーザを用いながらも高速度で交ｆＡＥ出力電力を最大
にする制御を行なうことを目的とするものである。(c) Purpose of the Invention The present invention has been made in view of the problems of the prior art as described above, and it is possible to obtain AC output power at high speed even though it uses a transformer user for AC power detection which has a slow response speed. The purpose of this is to perform control that maximizes the

（ニ）発明の構成 太陽′電池を電源とし、その直流出力を交流出力に変換
するインハークにおいて、前記電源に基準動作点を与え
ると共に、前記交流出力の電力を検出し、その検出値に
よって前記基準動作点を前記交流出力電力が当人する方
向へ移行姐しめ、且前記電源の動作点を前記基準動作点
に追従せしめることを特徴とするものである。(d) Structure of the Invention In an in-hark device that uses a solar cell as a power source and converts its DC output into AC output, a reference operating point is given to the power source, the power of the AC output is detected, and the detected value is used as the reference point. The present invention is characterized in that the operating point is shifted in the direction in which the AC output power is applied, and the operating point of the power source is made to follow the reference operating point.

（ホ）実施例 本発明の目的を達成するためには太陽電池電源出力の動
作点を高速で移動させる必要があるが、トランステユー
ザは応答速度の遅いものを使用するために、インバータ
の出力電力の変化量のみを用いて動作点を移動きせる方
法では制御速度が遅く、実用的ではない。(e) Example In order to achieve the purpose of the present invention, it is necessary to move the operating point of the solar cell power output at high speed, but in order to use a power source with a slow response speed, transte users A method of moving the operating point using only the amount of change in power has a slow control speed and is not practical.

一方、太陽電池電源の出力動作点の移動はトランスデユ
ーサの応答速度に比へると高速に行なうこｋが可能て゛
あり、太陽電池電源の出力動作点を一定とする制御を十
分実用的な速度で行なうことができる。本発明はこの点
に着目し、太陽電池電源に対しては基準動作点を与えて
高速の動作点一定住制御を行ない、応答速度の遅いトラ
ンスデユーサラ用いてその基準動作点を変化させると七
によってインバータ出力を最大になるように制御するも
のである。On the other hand, it is possible to move the output operating point of the solar battery power supply at high speed compared to the response speed of the transducer, and it is possible to perform control to keep the output operating point of the solar battery power supply constant for practical purposes. It can be done at speed. The present invention focuses on this point, and performs high-speed constant operating point control by giving a reference operating point to the solar battery power source, and then changes the reference operating point using a transducer with a slow response speed. 7 to control the inverter output to the maximum.

以下図面に即して、本発明インバータの制御ブｊ法をそ
の一実施例について詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the inverter control method of the present invention will be described in detail below with reference to the drawings.

第１図はそのブロック回路瞠である。く１）は太陽電池
電源（以下直流電源という）、（２）は該直流電源（１
）の直流出力を交流に変換するインバータ、（３）は該
インハーク（２）の交流出力電力を検出するトランステ
ユーザ、（４）は検出時間を設定するサンプラ、（５）
は前記直流電源（１）に供給する基準動作電圧Ｖ　ｒｅ
ｆを発生するフン１−ローラである。前記直流型ｆｉ（
１）は第２図に示す如き電圧−電力特性（図の曲線■）
或いは電圧−電流特性（図の曲線■）を右側る。前記イ
ンバータ（２）としては６０Ｈｚの単相交流を出力する
ＰＷＭ（べ月ス幅変調）方式のものを使っている。前記
トランスチューナ（３）としては応答時定数が０．５秒
のものを用いている。前記コントローラ（５）は８ビ・
ノドのマイクロプロセツサを実装し、前記サンプラ（４
）は該マイクロプロセ／すのソフトウェアによって実現
せしめている。Figure 1 shows the block circuit diagram. (1) is a solar battery power source (hereinafter referred to as DC power source), (2) is the DC power source (1)
) is an inverter that converts the DC output into AC, (3) is a transformer that detects the AC output power of the inverter (2), (4) is a sampler that sets the detection time, (5)
is the reference operating voltage V re supplied to the DC power supply (1)
This is the fan 1-roller that generates f. The DC type fi (
1) is the voltage-power characteristic as shown in Figure 2 (curve ■ in the figure)
Alternatively, change the voltage-current characteristics (curve ■ in the figure) to the right. As the inverter (2), a PWM (base width modulation) type inverter that outputs a single-phase alternating current of 60 Hz is used. The transtuner (3) has a response time constant of 0.5 seconds. The controller (5) is an 8-bit
The sampler (4
) is realized by the software of the microprocessor.

Ａｉｔ記直流１Ｆ源（１）の電圧■は基準動作電圧Ｖ　
ｒ　ｅ　ｆに追従し、直、流出力電力Ｐｏｃを発生する
。The voltage of the DC 1F source (1) is the reference operating voltage V
It follows r e f and generates direct output power Poc.

前記インバータ（２）はこの直流出力電力ＰＤＣを交す
（３）は前記交流出力電力ｆ＝を入力と１７、サンプラ
（４）によって検出値Ｐ’ＡＣを得る。こ、−でサンプ
リング周期Ｔは前記トランスデユーサ（３）の応答時定
数より十分大きくＴ＝１秒に設定する。The inverter (2) crosses this DC output power PDC (3) inputs the AC output power f=17, and obtains a detected value P'AC by the sampler (4). Here, the sampling period T is set to T=1 second, which is sufficiently larger than the response time constant of the transducer (3).

前記コントローラ（５）は時刻ｔにおける基準動作′雌
用Ｖｒｅｆ（ｔ）を、時刻ｔ−Ｔ、ｔ−２Ｔの出力を用
いて次式 ％式％）］ として与える関数発生器である。ここでゲインにはＰ＊
ＡＣが増加中のときＴ値、減少中のとき負値をとる。前
記コントローラ（５）は−ヒ式に基いてザンノリング周
期Ｔ＝１秒でトランスデユー′す゛（３）の出力を取込
み、基＄動作電圧Ｖ　ｒｅｆを算出して出力する。そし
て次のサンプリング時間までに直流電源（１）とトラン
スデユーす（３）の出力を整定する。The controller (5) is a function generator that provides the reference operation 'Female Vref(t) at time t as the following formula using the outputs at times t-T and t-2T. Here, the gain is P*
It takes a T value when AC is increasing, and a negative value when it is decreasing. The controller (5) takes in the output of the transducer (3) at a scanning period T=1 second based on the equation, calculates and outputs the basic operating voltage Vref. Then, the outputs of the DC power supply (1) and the transducer (3) are stabilized by the next sampling time.

第３図は直？Ａ［電！（１）及びインハークく２）の出
力室カー電１五特性図である。この図において太陽電池
の動作電圧即ち直ｄｌＥ電源（１）の出力電圧Ｖ＝Ｖｒ
ｅｆ−ＶＩ′ｃあるときの直流電源く１）の出力電力及
びイ／／・−タ（２）Ｑ＞交流出力電力が夫々Ａ点及び
ａ点にあるとするとき、コントローラ（５）は交流出力
電力ＰＡＣが増大する方向へ動作点を移動♂・ぜるため
にＶｒｅｆを増加き仕る。また前記出力電圧Ｖ＝Ｖｒｅ
ｆ＝Ｖ２であるときの直流電源（１）の出力電力及びイ
ンバータぐ２）の交流出力電力が夫々Ｂ点及びｂ点にあ
るとき前記コントローラ（５）はＶｒｅｆを減少きせる
。このようにして直流型ｔ（１）の出力電圧Ｖはインバ
ータ（２）の交流出力電力Ｐ　ＡＣが最大となる動作点
Ｃを与える電圧Ｖｏの近傍に保持される。前記コントロ
ーラ（５）のケイ′ンには可変であり、基準動作電圧Ｖ
　ｒｅｆの変化量を△ＰＡＣ／△■（△ＰＡＣはインバ
ータ（２）の出力電力の微小変化量、△Ｖは直流電源く
１）の出力電圧の微ノ卦変化量）に比例させることによ
り、直流７Ｅ源（１）の動作電圧Ｖが前記最適動作゛電
圧ＶｏＱ）近傍にないときのＶｒｅｆの変化量を犬きく
；とることができ、したがってインバータ（２）の出力
電力は最適動作点Ｃへ高速で移行する。尚基準動作電圧
Ｖ　ｒｅｆの変化に対する直ｒｆｔ　Ｔｔ、　１ｍ　（
１）の出力電圧■の応答速度はトランスデユーサ（３）
の時定数に比へると十分高速であるから、Ｖ＝Ｖｒｅｆ
なる定常状態からＶｒｅｆを微小変化させた場合、サン
プリング周期Ｔが経過する間には出力電圧■は基準動作
電圧Ｖ　ｒｅｆに追従できる。Is the third figure direct? A [Electric! FIG. 15 is a characteristic diagram of the output chamber car electric power of (1) and 2). In this figure, the operating voltage of the solar cell, that is, the output voltage of the direct dlE power supply (1) V = Vr
The output power of the DC power supply when there is ef-VI′c and the output power of the DC power supply (2) Q Vref is increased in order to move the operating point in the direction in which the output power PAC increases. Further, the output voltage V=Vre
When f=V2, the controller (5) decreases Vref when the output power of the DC power source (1) and the AC output power of the inverter (2) are at point B and point b, respectively. In this way, the output voltage V of the DC type t(1) is maintained near the voltage Vo that provides the operating point C at which the AC output power PAC of the inverter (2) is maximum. The voltage of the controller (5) is variable and has a reference operating voltage V.
By making the amount of change in ref proportional to △PAC/△■ (△PAC is the minute amount of change in the output power of the inverter (2), and △V is the amount of minute change in the output voltage of the DC power supply (1)), When the operating voltage V of the DC 7E source (1) is not near the optimum operating voltage VoQ, the amount of change in Vref can be adjusted, and the output power of the inverter (2) can therefore be brought to the optimum operating point C. Migrate fast. Note that the direct rft Tt, 1m (
1) The response speed of the output voltage ■ is the transducer (3)
Since it is sufficiently fast compared to the time constant of V=Vref
When Vref is slightly changed from the steady state, the output voltage ■ can follow the reference operating voltage V ref while the sampling period T elapses.

くべ）発明の効果 本発明は以上の説明の如く、太陽′Ｉ！を池を電源とし
、その直流出力を交流出力に変換するインバータにおい
て、前記電源に基準動作点を与えると共に、前記交流出
力の電力を検出し、その検出値によって前記基準動作点
を前記交流出力電力が増大する方向へ移ｆｉせしめ、且
前記電源の動作点を前記基準動作点に追従せしめること
により、直流電源から最大の交流電力を取出すような制
御を高速度で行なうことが可能となり、太陽電池の電力
を有効に利用することができる効果がある。Effects of the Invention As explained above, the present invention has the effect of the sun'I! In an inverter that uses a pond as a power source and converts its DC output to AC output, a reference operating point is given to the power source, the power of the AC output is detected, and the reference operating point is set to the AC output power based on the detected value. By shifting fi in the direction of increasing and making the operating point of the power source follow the reference operating point, it becomes possible to perform control at high speed to extract the maximum AC power from the DC power source, and the solar cell This has the effect of making it possible to use electric power effectively.

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

第１図は本発明イン／・−夕の制御方法の構成ブロック
回路図、第２図は太陽電池の出力電力−電圧及び出力電
流−電圧特性図、第３図は太陽電池の出力電流−電圧及
びインバータの出力型カー量比特性図である。 （１）・・電源、（２）・・インバータ。 出願人　三洋ｉｌｔ機株式会社 代理人　弁理士　佐野静夫Fig. 1 is a block circuit diagram of the inventive control method, Fig. 2 is a solar cell output power-voltage and output current-voltage characteristic diagram, and Fig. 3 is a solar cell output current-voltage characteristic diagram. and an output type car quantity ratio characteristic diagram of the inverter. (1)...power supply, (2)...inverter. Applicant Sanyo Iltki Co., Ltd. Agent Patent Attorney Shizuo Sano

Claims (1)

【特許請求の範囲】[Claims] （１ン太陽電池を電源とし、その直流出力を交流出力に
変換するインバータにおいて、前記電源に基準動作点を
与えると共に、前記交流出力の電力を検出し、その検出
値によって前記基準動作点を前記交流出力電力が増大す
る方向へ移行せしめ、且前記′を源の動作点を前記基準
動作点に追従せしめることを特徴とするインバータの制
御方法。(In an inverter that uses a 1-inch solar cell as a power source and converts its DC output into AC output, a reference operating point is given to the power source, the power of the AC output is detected, and the reference operating point is set to 1. A method for controlling an inverter, characterized in that the alternating current output power is shifted in a direction of increasing, and the operating point of the source is caused to follow the reference operating point.
JP59089818A 1984-05-04 1984-05-04 Inverter control method Expired - Lifetime JPH0654452B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59089818A JPH0654452B2 (en) 1984-05-04 1984-05-04 Inverter control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59089818A JPH0654452B2 (en) 1984-05-04 1984-05-04 Inverter control method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP5205242A Division JPH07109569B2 (en) 1993-08-19 1993-08-19 Maximum power control method for solar cells

Publications (2)

Publication Number Publication Date
JPS60234468A true JPS60234468A (en) 1985-11-21
JPH0654452B2 JPH0654452B2 (en) 1994-07-20

Family

ID=13981326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59089818A Expired - Lifetime JPH0654452B2 (en) 1984-05-04 1984-05-04 Inverter control method

Country Status (1)

Country Link
JP (1) JPH0654452B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014204524A (en) * 2013-04-03 2014-10-27 株式会社ダイヘン Control circuit controlling power conversion circuit, and power conversion device comprising the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5691633A (en) * 1979-12-26 1981-07-24 Fuji Electric Co Ltd Solar battery utilizing feeding system control system
JPS57206929A (en) * 1981-06-15 1982-12-18 Toshiba Corp Controlling system for maximum output electric power of photoelectric cell

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5691633A (en) * 1979-12-26 1981-07-24 Fuji Electric Co Ltd Solar battery utilizing feeding system control system
JPS57206929A (en) * 1981-06-15 1982-12-18 Toshiba Corp Controlling system for maximum output electric power of photoelectric cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014204524A (en) * 2013-04-03 2014-10-27 株式会社ダイヘン Control circuit controlling power conversion circuit, and power conversion device comprising the same

Also Published As

Publication number Publication date
JPH0654452B2 (en) 1994-07-20

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