JPS6169394A - Current type inverter - Google Patents

Current type inverter

Info

Publication number
JPS6169394A
JPS6169394A JP59190684A JP19068484A JPS6169394A JP S6169394 A JPS6169394 A JP S6169394A JP 59190684 A JP59190684 A JP 59190684A JP 19068484 A JP19068484 A JP 19068484A JP S6169394 A JPS6169394 A JP S6169394A
Authority
JP
Japan
Prior art keywords
commutation
current
output
reactance
motor
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
Application number
JP59190684A
Other languages
Japanese (ja)
Inventor
Naomasa Sawada
澤田　尚正
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP59190684A priority Critical patent/JPS6169394A/en
Publication of JPS6169394A publication Critical patent/JPS6169394A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/03—AC-DC converter stage controlled to provide a defined DC link voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To stop a VVVF due to a commutation failure by always accurately calculating the lowest current necessary for a normal reactance and commutation, and limiting the upper limit frequency of the operation. CONSTITUTION:A commutation reactance calculator 12 inputs the output of a current detector 2 and the output of a commutation capacitor/charging voltage detector 13, and calculates the accurate commutation reactance of the present operating state. A commutation current setter 10 inputs the induced voltage of a motor 16 from a capacitor charging voltage detector 12, the commutation reactance value from the calculator 12 and the output from the oscillator 11 and calculates the minimum current necessary for the commutation. A speed reference limiter 8 operates to reduce a speed reference only when the minimum current necessary for the commutation of the output of the setter 10 is larger than the secondary current of a power source transformer 1 of the output of the detector 2.

Description

【発明の詳細な説明】 ［発明の技術分野〕 本発明シま、電流形インバータに関する。[Detailed description of the invention] [Technical field of invention] The present invention relates to a current source inverter.

し発明の技術的背景とその問題点〕 電流形インバータの転流コンデンサーの容量は過負荷条
件、最大運転周波数での最小負荷条件と電動機固有の転
流リアクタンスで決定される。[Technical background of the invention and its problems] The capacity of the commutation capacitor of a current source inverter is determined by the overload condition, the minimum load condition at the maximum operating frequency, and the commutation reactance specific to the motor.

このうち転流リアクタンスは既設の電動機等では設定が
難しく、また運転状態で値が変化するため、転流コンデ
ンサーの容量を正確に選択できない場合があり最大運転
周波数での最小負荷条件を満足できず運転上不安定状態
を引き起すことがあった。Of these, commutation reactance is difficult to set with existing motors, etc., and the value changes depending on the operating condition, so it may not be possible to accurately select the capacity of the commutation capacitor, and the minimum load condition at the maximum operating frequency may not be satisfied. This could lead to unstable operation.

また電流形インバータでは最小負荷に制限があるが、制
限値以上１こ軽負荷とな・つた場合、やはり運転が不安
定となったり転流失敗が起ったりして、運転全縦続Ｃき
なく々る問題があった。In addition, current source inverters have a limit on the minimum load, but if the load is one step lighter than the limit, the operation will become unstable or commutation failure will occur, and the full cascade of operation will not be possible. There were many problems.

［発明の目的〕 本発明は上記のような問題を解決するためｌこ成された
もので、その目的は軽負荷状態でも安定運転を継続でき
るような電流形インバータを提供することである。[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a current source inverter that can continue stable operation even under light load conditions.

〔発明の概要〕[Summary of the invention]

上記目的を達成するために本発明では、電流形インバー
タにおいてインバータ出力周波数から限界となる転流時
間を演算し、また電動機の誘起電圧と電流から現在の運
転状態１こおける正確な転流リアクタンスを演算し演算
された転流リアクタンスと限界となる転流時間とから転
流に必要な最小電流を演算し、検出される電流が演算さ
れた転流に必要な最小電流以下になった場合速度基準制
限回路ｆこより速度基準を下げ安定な運転を継続できる
ように制卸を行うことを特徴とする。In order to achieve the above object, the present invention calculates the commutation time that becomes the limit from the inverter output frequency in a current source inverter, and also calculates the accurate commutation reactance in the current operating state from the induced voltage and current of the motor. The minimum current required for commutation is calculated from the calculated commutation reactance and the limit commutation time, and if the detected current becomes less than the calculated minimum current required for commutation, the speed standard is determined. The limiting circuit f is characterized in that it lowers the speed reference and performs control so that stable operation can be continued.

〔発明の実施例〕[Embodiments of the invention]

以下本発明を図面に示す一実施例について説明ｆ“　　
　する。図面１□本発明１゜よる電流形イｙ　／＜　−
ｐ　（７）構成例を示すものである。An embodiment of the present invention shown in the drawings will be explained below.
do. Drawing 1 □Current type I according to the present invention 1゜ /< -
p (7) This shows a configuration example.

図において１６は交流電動機である。１は電源変圧器で
ありその２次出力をサイリスタ順変換器１７で直流に変
換し、変換された直流からサイリスタ逆変換器１８で速
度基準７に応じた交流に変換し交流電源として上記交流
電動機１６の１次巻線に供給するように電源回路を構成
している。In the figure, 16 is an AC motor. 1 is a power transformer whose secondary output is converted into DC by a thyristor forward converter 17, and the converted DC is converted into AC according to the speed standard 7 by a thyristor inverse converter 18, and the AC motor is used as an AC power source. The power supply circuit is configured to supply power to 16 primary windings.

６は、速度基準７を交流電動機１６に与える電圧と周波
数ｌこ変換する絶対値変換器である。１１はサイリスタ
逆変換器１８（こ運転周波数指令を与える発振器である
。５は絶対値変換器６の電圧信号と電圧検出器１５から
の電動機銹起電圧を入力としサイリスタ順変換器１７の
電圧を制卸する電圧制卸器である。４は電圧制卸器５の
出力と電流検出器２の出力である電源変圧器１の２次出
力電流信号を入力としサイリスタ順変換器１７の電流を
制卸する電流制卸器である。Reference numeral 6 denotes an absolute value converter that converts the speed reference 7 into the voltage and frequency applied to the AC motor 16. Reference numeral 11 denotes a thyristor inverse converter 18 (this is an oscillator that provides an operating frequency command. 5 inputs the voltage signal of the absolute value converter 6 and the motor electromotive force from the voltage detector 15, and converts the voltage of the thyristor forward converter 17). A voltage regulator 4 controls the current of the thyristor forward converter 17 by inputting the secondary output current signal of the power transformer 1, which is the output of the voltage regulator 5 and the output of the current detector 2. It is a current limiter that outputs electricity.

誘起電圧サンプリング回路１４は、電圧検出器１５ｆこ
より出力される交流電動機１６の誘起電圧を短い周期で
サンプリングするものであり、１３はサンプリングされ
た交流電動機１６の誘起電圧の瞬時値から転流開始時の
電圧と転流コンデンサー充電電圧検出器である。１２は
電流検出器２の出力と転流コンデンサー充電電圧検出器
１３の出力を夫々入力とし、現在の運転状態での正確な
転流リアクタンスを演算する転流リアクタンス演算器で
ある。The induced voltage sampling circuit 14 samples the induced voltage of the AC motor 16 outputted from the voltage detector 15f in short cycles, and the reference numeral 13 calculates the value at the start of commutation from the instantaneous value of the sampled induced voltage of the AC motor 16. Voltage and commutation capacitor charging voltage detector. Reference numeral 12 denotes a commutation reactance calculator which receives the output of the current detector 2 and the output of the commutator capacitor charging voltage detector 13, respectively, and calculates an accurate commutation reactance in the current operating state.

１０は転流コンデンサー充電電圧検出器１３で検出され
た転流開始時の交流電動機１６の誘起電圧と転流リアク
タンス演算器１２の出力である正確々転流リアクタンス
値と発振器１１からの出力を夫々入力とし転流に必要な
最小電流を演算する転流電流設定器である。10 indicates the induced voltage of the AC motor 16 at the start of commutation detected by the commutation capacitor charging voltage detector 13, the accurate commutation reactance value which is the output of the commutation reactance calculator 12, and the output from the oscillator 11, respectively. This is a commutation current setting device that takes the input and calculates the minimum current required for commutation.

８は、転流電流設定器１０の出力である転流ｆこ必要な
最小電流が電流検出器２の出力である電源変圧器１の２
次電流より大きい場合のみ速度基準を下げる様に動作す
る速度基準制限回路である。8 is the output of the commutation current setting device 10, which is the commutation f, and the minimum current required is the output of the current detector 2.
This is a speed reference limiting circuit that operates to lower the speed reference only when the current is larger than the next current.

次に、かかる如く構成した電流形インバータ装置の作用
について説明する。転流コンデンサ充電屯田検出器１３
により検出された転流開始時の交流電動機１６の誘起電
圧をＶ、ｓｉｎψ（ψは負荷力率角）、転流コンデンサ
１９の充電電圧をＥｃ　、転流コンデンサの単一容量を
Ｃ１電流検出擬２により検出された電源変圧器１の２次
電流をＩｄ　とするとｆｆｃ　＝＝　Ｉｄ−Ｔ語＋　Ｂ
−ｖ＆１−ｓｉｎｔｐ　　−−−−−−−−−■が成立
する。（ただしＬは転流リアクタンス、Ｃｏ＝ＡＣ） ■式を用いて転流リアクタンス演算器１２１こより現在
の運転状態における正確な転流リアクタンスを演算する
ことができる。Next, the operation of the current source inverter device configured as described above will be explained. Commutation capacitor charging tonden detector 13
The induced voltage of the AC motor 16 at the start of commutation detected by is V, sinψ (ψ is the load power factor angle), the charging voltage of the commutation capacitor 19 is Ec, and the single capacitance of the commutation capacitor is C1 current detection simulation. If the secondary current of power transformer 1 detected by 2 is Id, then ffc == Id - T word + B
−v&1-sintp −−−−−−−■ holds true. (L is the commutation reactance, Co=AC) Using equation (1), the commutation reactance calculator 121 can calculate an accurate commutation reactance in the current operating state.

運転周期を下、転流に最低限必要な電流をＩｍｉ口とす
ると が成立する。When the operating cycle is set below and the minimum current required for commutation is set as Imi, the following holds true.

従って、転流電流設定器１０において発信器工１からの
出力信号を運転周期Ｔ１こ変換し転流に最低限必要な電
流ｌｍ１ｎを０式を用いて演算できる。Therefore, in the commutation current setting device 10, the output signal from the transmitter 1 is converted by the operating period T1, and the minimum current lm1n required for commutation can be calculated using the formula 0.

電流形インバータでは電源変圧器１の２次電流ＩｄがＩ
面ｎ以下となると運転が不安定状態となりたり転流失敗
を起したりする。そのため比較器９によりｌｍ１ｎ　＞
　Ｉｄとなった場合は速度基準制限回路８１こより速度
基準を下げｌｍ１ｎ　（Ｉｄが常に満足される様１こ制
卸する。In a current source inverter, the secondary current Id of the power transformer 1 is I
When the surface is less than n, the operation becomes unstable or commutation failure occurs. Therefore, by comparator 9, lm1n >
When Id is reached, the speed reference is lowered by the speed reference limiting circuit 81 (lm1n is controlled by one circuit so that Id is always satisfied).

また、転流リアクタンスＬは運転状態により変化するた
め転流リアクタンスＬが増加した場合最低負荷での上限
周波数が下がるだめ、最低負荷条件での運転が不安定に
なる場合がある。Further, since the commutation reactance L changes depending on the operating condition, if the commutation reactance L increases, the upper limit frequency at the lowest load will decrease, and the operation under the lowest load condition may become unstable.

本発明によれば常に正確な転流リアクタンス及び転流１
こ最低限必要な電流を演算し、常に運転上限周波数を制
限することにより安定運転を確保することができる。According to the invention, the commutation reactance and commutation 1 are always accurate.
Stable operation can be ensured by calculating the minimum required current and always limiting the upper limit frequency of operation.

〔発明の効果〕〔Effect of the invention〕

既設の電動機等では、転流リアクタンスの値の設定は難
しく運転状態において値が変化するため最大周波数での
最小負荷条件を満足できなかったり、また最小負荷条件
以上の軽負荷が生じた場合運転が不安定となることがあ
るが、本発明によれば常に転流条件を満足する様に制卸
するため、転、ギ　　　流失敗等テＶＶＶＦ　（Ｖａｒ
ｉａｂｌｅ　Ｖｏｌｔａｇｅ　ＶａｒｉａｂｌｅＦｒｅ
ｑｕｅｎｃｙ　）を止めることなく運転を継続させるこ
とができる。For existing motors, it is difficult to set the value of commutation reactance, and the value changes depending on the operating condition, so if the minimum load condition at the maximum frequency cannot be satisfied, or if a light load that exceeds the minimum load condition occurs, operation may be interrupted. However, according to the present invention, since the commutation conditions are always satisfied, there is no chance of commutation, gear flow failure, etc. VVVF (Var
iable Voltage VariableFre
operation can be continued without stopping the engine.

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

図面は本発明の一実施例を示す回路構成図である。 】・・・電源変圧器　　　２・・・電流検出器３・・・
位相制卸器　　　４・・・電流制卸器５・・・電圧制卸
器　　　６・・・絶対値変換器７・・・速度基準　　　
　８・・・速度基準制限回路９・・・比較器　　　　　
１０・・・転流電流設定器１１・・・発振器　　　　　
　１２・・・転流リアクタンス演算器１３・・・転流コ
ンデンサ充電電圧検出器１４・・・誘起電圧サンプリン
グ回路 １５・・・電圧検出器　　　１６・・・交流電動機１７
・・・サイリスタ順変換器　１８・・・サイリスタ逆変
換器１９・・・転流コンデンサーThe drawing is a circuit configuration diagram showing an embodiment of the present invention. ]...Power transformer 2...Current detector 3...
Phase regulator 4... Current regulator 5... Voltage regulator 6... Absolute value converter 7... Speed reference
8...Speed reference limiting circuit 9...Comparator
10... Commutation current setting device 11... Oscillator
12... Commutation reactance calculator 13... Commutation capacitor charging voltage detector 14... Induced voltage sampling circuit 15... Voltage detector 16... AC motor 17
... Thyristor forward converter 18... Thyristor inverse converter 19... Commutation capacitor

Claims (1)

【特許請求の範囲】[Claims] 交流電動機を可変速制卸する電流形インバータにおいて
、前記交流電動機の誘起電圧をサンプリングする誘起電
圧サンプリング回路と、この誘起電圧サンプリング回路
の出力により転流開始時の電動機誘起電圧及び転流コン
デンサー充電電圧を検出する転流コンデンサー充電電圧
検出器と、この転流コンデンサー充電電圧検出器によっ
て検出される転流開始時の電動機誘起電圧Ｖ＿Ｍｓｉｎ
ψ、転流コンデンサ充電電圧Ｅｃ及びインバータ入力電
流 I ｄから転流リアクタンスＬを演算する転流リアク
タンス演算器と、この転流リアクタンス演算器の出力、
前記転流コンデンサー充電電圧検出器の出力及び発振器
からの運転同期信号に基き転流に必要な限界最小電流を
設定する転流電流設定器と、この転流電流設定器の設定
する電流値が大きい場合のみ前記交流電動機の速度基準
を下げる動作する速度基準制限回路とを具備することを
特徴とする電流形インバータ。A current source inverter that controls the variable speed of an AC motor includes an induced voltage sampling circuit that samples the induced voltage of the AC motor, and an output of the induced voltage sampling circuit that determines the motor induced voltage and the commutation capacitor charging voltage at the start of commutation. A commutating capacitor charging voltage detector detects the commutating capacitor charging voltage detector, and a motor induced voltage V_Msin at the start of commutation detected by this commutating capacitor charging voltage detector.
ψ, a commutation reactance calculator that calculates the commutation reactance L from the commutation capacitor charging voltage Ec and the inverter input current Id, and the output of this commutation reactance calculator,
a commutation current setting device that sets a limit minimum current necessary for commutation based on the output of the commutation capacitor charging voltage detector and an operation synchronization signal from the oscillator, and a current value set by this commutation current setting device is large. A current source inverter comprising a speed reference limiting circuit that operates to lower the speed reference of the AC motor only when the AC motor is in use.
JP59190684A 1984-09-13 1984-09-13 Current type inverter Pending JPS6169394A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59190684A JPS6169394A (en) 1984-09-13 1984-09-13 Current type inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59190684A JPS6169394A (en) 1984-09-13 1984-09-13 Current type inverter

Publications (1)

Publication Number Publication Date
JPS6169394A true JPS6169394A (en) 1986-04-09

Family

ID=16262153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59190684A Pending JPS6169394A (en) 1984-09-13 1984-09-13 Current type inverter

Country Status (1)

Country Link
JP (1) JPS6169394A (en)

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