JPS633676A - Control method for voltage type inverter - Google Patents
Control method for voltage type inverterInfo
- Publication number
- JPS633676A JPS633676A JP61146066A JP14606686A JPS633676A JP S633676 A JPS633676 A JP S633676A JP 61146066 A JP61146066 A JP 61146066A JP 14606686 A JP14606686 A JP 14606686A JP S633676 A JPS633676 A JP S633676A
- Authority
- JP
- Japan
- Prior art keywords
- output voltage
- output
- voltage
- load current
- frequency
- 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
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000001133 acceleration Effects 0.000 claims abstract description 16
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Landscapes
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は交流電動機を駆動するための電圧形インバータ
装置の制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of controlling a voltage source inverter device for driving an AC motor.
（従来の技術）
ＰＷＭ方式及びＰ Ａ Ｍ方式の電圧形インバータ装胃
において、−般に電圧形インバータ装置の出力周波数（
Ｆ）と出力電圧（Ｖ）の関係は、駆動する交流電動機及
び負荷のトルク特性に応じて第３図の直線ＡまたはＢに
示すように比率Ｖ／Ｆを一定とする定トルク特性、ある
いは曲線Ｃのように出力電圧（Ｖ）を出力周波数（Ｆ）
の二乗に比例させる二乗低減トルク特性などに分けて制
御される。これらのＶ／Ｆ特性は、−般に電圧形インバ
ータ装置により交流電動機を駆動する場合には予め設定
されているが、交流電！ｌ１機及び負荷のトルク特性に
より近づけ省エネルギー化するために電圧形インバータ
装置の負荷電流を検出し、その値が最小となるように出
力電圧の補正制御を行なう電圧形インバータ装置の制御
方法もある。(Prior art) In PWM system and PAM system voltage source inverter installation, the output frequency of the voltage source inverter device (
The relationship between F) and output voltage (V) can be expressed as a constant torque characteristic where the ratio V/F is constant, as shown in straight line A or B in Figure 3, or a curved line, depending on the torque characteristics of the AC motor being driven and the load. The output voltage (V) as shown in C and the output frequency (F)
It is controlled by dividing it into a square reduction torque characteristic that is proportional to the square of . These V/F characteristics are generally set in advance when an AC motor is driven by a voltage source inverter, but AC motors! There is also a method of controlling a voltage source inverter device in which the load current of the voltage source inverter device is detected and the output voltage is corrected and controlled so that the value thereof is minimized in order to save energy by bringing the torque characteristics closer to the torque characteristics of the machine and the load.
第４図は、上述した制御方法の流れを示すフロチャート
の一例である。即ち、今、出力周波数がｆｌの位置で一
定運転されているとすると、その時点の出力電圧Ｖｌに
おける負荷電流Ｉｔを読み、次に出力電圧■１に電圧補
正量−Δ■を加えＶ２とし再度その時の負荷電流Ｉ２を
読み込み、１１と１２を比較し、ＩＩ＞１２が成立する
場合には再び現在の出力電圧Ｖ２に−ΔＶを加え■３と
し、その時点の負荷電流Ｉ３を読み込み、Ｉ２と１３と
の比較を行なうという流れを繰り返す。そして、やがて
出力電圧が不足することにより、前記交流電動機のすべ
りが増大すると共に励磁電流即ち負荷電流Ｉｎの増加に
至り、ｌ ＜Ｉｎが成立すｎ−す
るため、その時の出力電圧ＶｎにΔＶを加えた出力電圧
Ｖ。−１にて一定運転を行なう。FIG. 4 is an example of a flowchart showing the flow of the control method described above. That is, assuming that the current operation is constant with the output frequency fl, read the load current It at the output voltage Vl at that time, then add the voltage correction amount -Δ■ to the output voltage ■1 and set it as V2 again. Read the load current I2 at that time, compare 11 and 12, and if II>12 holds, add -ΔV to the current output voltage V2 again to make it 3, read the load current I3 at that time, and compare I2 and 13 is repeated. Then, as the output voltage becomes insufficient, the slip of the AC motor increases and the excitation current, that is, the load current In, increases. Since l < In holds n-, ΔV is added to the output voltage Vn at that time. The applied output voltage V. Perform constant operation at -1.
また、上述した１１と１２との比較において、ＩＩくＩ
２が成立した場合、逆に■１にΔＶを加えた時の負荷電
流Ｉ２を読み込みＩＩとＩ２の比較を行なう。そしてＩ
Ｉ＞１２が成立した時には、同様にして徐々に出力電圧
に電圧補正量ΔＶを加えながら電圧補正制御前と後の負
荷電流の値を比較する。そして出力電圧が増すことによ
り前記交流電動機が過励磁状態となり負荷電流が増大し
、Ｉｎ−１＜Ｉｎが成立した時点で出力電圧をＶｎ−１
とし一定運転を行なう。つまり負荷電流が最小となる出
力電圧をさぐり当てることが行なわれる。In addition, in the comparison between 11 and 12 mentioned above, II
If 2 holds true, conversely, read the load current I2 obtained by adding ΔV to 1 and compare II and I2. And I
When I>12 holds true, the load current values before and after the voltage correction control are compared while gradually adding the voltage correction amount ΔV to the output voltage in the same way. As the output voltage increases, the AC motor enters an overexcited state and the load current increases, and when In-1<In is established, the output voltage is reduced to Vn-1.
and perform constant operation. In other words, an attempt is made to find the output voltage that will minimize the load current.
次に、前記流れの途中または、−定運転に入ってから、
出力周波数、即ち前記インバータ装置の出力周波数指令
の設定値がｆｌに変化した場合について考える。Next, during the flow or after entering constant operation,
Consider a case where the output frequency, that is, the set value of the output frequency command of the inverter device changes to fl.
出力周波数はｆｌからｆ２へ移ｖＪ（加速）するが、出
力電圧は上記出力電圧補正制御が行なわれた後、または
途上にあり一般的には省エネルギーを目的とする場合、
Ｖ／Ｆ比は電圧比率を下げることが多いため、その時点
の出力電圧から出力周波数の上昇に伴ない加速する場合
、出力電圧が前述のように低下しているため、前記誘′
４電動機及び負荷を加速するのに必要とされる加速トル
クが得られない状態が起こる。The output frequency moves from fl to f2 and accelerates vJ, but the output voltage changes after the above output voltage correction control is performed or in the process, and generally when the purpose is to save energy,
Since the V/F ratio often lowers the voltage ratio, when the output voltage at that point accelerates as the output frequency increases, the output voltage has decreased as described above, so the
4 A situation may occur in which the acceleration torque required to accelerate the motor and load cannot be obtained.
第５図は、前述した方法による前記インバータ装置の出
力周波数（Ｆ）と出力電圧（Ｖ）の関係を表わす。即ち
、周波数ｆ１の状態で電圧補正制御を開始し、出力電圧
Ｖｎの時に、インバータ装置の出力周波数指令の設定が
ｆｌがらｆ２に変化した場合に、図中破線の如く加速し
ようとすると、電圧補正ａ （Ｖ＋ −Ｖｎ ）の分だ
け予め設定されたＶ／Ｆ比より下がっているため、すべ
りが増加し負荷電流が増加することになり、最悪時には
加速できないことがある。FIG. 5 shows the relationship between the output frequency (F) and the output voltage (V) of the inverter device according to the method described above. That is, when voltage correction control is started in the state of frequency f1, and when the output voltage is Vn, the setting of the output frequency command of the inverter device changes from fl to f2, and when an attempt is made to accelerate as shown by the broken line in the figure, the voltage correction Since the V/F ratio is lower than the preset V/F ratio by a (V+ -Vn), the slip increases and the load current increases, and in the worst case, acceleration may not be possible.
（発明が解決しようとする問題点）
上記従来技術においては、電圧形インバータ装置の出力
周波数指令の設定が上記インバータ装置の入力手段に依
り変化（加速）した場合、出力電圧補正制御の途中また
は一定運転にある時においては、出力電圧不足に伴ない
、前記交流電動機及び負荷の加速に必要とされる加速ト
ルクが得られず前記交流電動懇のすべりが増大し、励磁
電流即ち負荷電流の急増を招き、失速に至ることもある
。従って上記技術によると出力電圧不足制６０を行なっ
た後は、交流電動機及びその負荷の安定した加速運転が
不可能な場合が生じるという問題点がある。(Problems to be Solved by the Invention) In the above conventional technology, when the setting of the output frequency command of the voltage source inverter device changes (accelerates) depending on the input means of the inverter device, the output voltage is fixed during output voltage correction control or when the output frequency command is constant. During operation, due to the lack of output voltage, the acceleration torque required to accelerate the AC motor and the load cannot be obtained, and the slip of the AC motor increases, causing a sudden increase in the excitation current, that is, the load current. This may lead to a stall. Therefore, according to the above technique, there is a problem in that after the output voltage shortage control 60 is performed, stable accelerated operation of the AC motor and its load may not be possible.
本発明は、定出力周波数運転状態から加速運転が要求さ
れた場合でも失速や負荷電流の急増や騒音等が発生する
ことを防止し得て、交流電動機及び負荷の安定した加速
運転が可能なインバータ表罫の制御方法を提供すること
を目的とする。The present invention provides an inverter that can prevent stalling, rapid increase in load current, noise, etc. from occurring even when accelerated operation is required from a constant output frequency operating state, and that enables stable accelerated operation of an AC motor and load. The purpose of this invention is to provide a method for controlling table borders.
（問題点を解決するための手段）
本発明は、インバータ装置の周波数設定指令を常に検出
してその変化を監視し、前記周波数設定指令に加速方向
の変化があった場合に、出力電圧補正制御に割り、込み
、その時点の出力電圧を予め設定されている出力電圧（
Ｖ）と出力周波数（Ｆ）との比率（Ｖ／Ｆ比）に従った
出力電圧、即ち補正制御の行なわれる前の出力電圧に復
帰させた後、前記周波数指令の新たな設定周波数まで予
め設定されたＶ／Ｆ比に従い加速させることに特徴を有
する。(Means for Solving the Problems) The present invention constantly detects the frequency setting command of an inverter device and monitors its changes, and when there is a change in the acceleration direction in the frequency setting command, output voltage correction control is performed. interrupts the current output voltage to the preset output voltage (
After returning the output voltage to the ratio (V/F ratio) between V) and output frequency (F), that is, the output voltage before correction control was performed, the frequency command is preset to the new set frequency of the frequency command. It is characterized in that it is accelerated according to the V/F ratio determined.
（作 用）
上述した方法により定常運転時には負荷電流を最小にす
る様に交流出力電圧を補正制御し、加速時には一旦補正
前の交流出力電圧まで復帰させることにより、負荷電流
の急増及び失速、騒音等の問題が防止でき安定した加速
運転を行なえる。(Function) By using the method described above, the AC output voltage is corrected and controlled to minimize the load current during steady operation, and during acceleration, the AC output voltage is returned to the pre-correction AC output voltage, thereby reducing sudden increases in load current, stalling, and noise. Problems such as these can be prevented and stable acceleration operation can be performed.
（実施例）
本発明の実施例を以下、第１図のフローチャートを参照
しながら説明するに、第１図において電圧形インバータ
装置の出力電圧補正制御１については第３図のすべてを
有するものであるため、同一符号を何して詳細の説明に
ついては、省略する。(Embodiment) An embodiment of the present invention will be described below with reference to the flowchart shown in FIG. 1. In FIG. Therefore, the same reference numerals will be used and detailed explanation will be omitted.
定出力周波数状態、即ち、出力周波数設定指令に変化が
なく割り込み２が発生しない状態においては、出力電圧
補正制＠１にてその時点の出力周波数における負荷電流
が最小になる点を検索して出力電圧値を設定する。ここ
で、電圧形インバータ装置の出力周波数指令の設定が入
力手段により変化した場合、その時点で前記出力電圧補
正制御１に割り込み２を生じ、制御の流れを加速制御１
３へと切換える。この加速制御！１３においては、まず
前記出力電圧補正制御１における現在の出力電圧Ｖｎを
読み込み、かつ、予め設定されている出力電圧（Ｖ）と
出力周波数（Ｆ）の比率Ｖ／Ｆ比に従って、現在の出力
周波数に応じた出力電圧Ｖ１を計算または読み込みし、
Ｖｎ ＝Ｖ＋ どなる様に現在の出力電圧を徐々にｉ＋
ｌＩ ！Ｗ ｔ、てＶｎ ＝Ｖｌが成立した時点で割り
込み２を解除すると同時に出力周波数指令の設定の変化
の条件を読み込み、予め設定されたＶ／Ｆ比に従い加速
を開始する。In a constant output frequency state, that is, in a state where there is no change in the output frequency setting command and interrupt 2 does not occur, the output voltage correction system @1 searches for the point where the load current at that point in time is the minimum at the output frequency and outputs it. Set the voltage value. Here, when the setting of the output frequency command of the voltage source inverter device is changed by the input means, an interrupt 2 is generated in the output voltage correction control 1 at that point, and the flow of control is changed to the acceleration control 1.
Switch to 3. This acceleration control! 13, first read the current output voltage Vn in the output voltage correction control 1, and adjust the current output frequency according to the preset ratio V/F ratio between the output voltage (V) and the output frequency (F). Calculate or read the output voltage V1 according to
Vn = V+ Gradually increase the current output voltage to i+
lI! When W t and Vn = Vl are satisfied, interrupt 2 is canceled, and at the same time, the conditions for changing the setting of the output frequency command are read, and acceleration is started according to the preset V/F ratio.
第２図は、本発明による前記インバータ装置の出力周波
数（Ｆ）と出力電圧（Ｖ）の関係の例である。即ち、出
力周波数ｆ１で電圧補正制御１が行われ、出力電圧がＶ
ｎに補正されて定速運転しているとする。この時に電圧
形インバータ装置の出力周波数指令の設定がｆｌからｆ
２に変化した場合、図中破線の如く、まず出力電圧を電
圧補正制御前の■１へ上昇させる。そして、その後出力
電圧■１まで出力電圧が復帰した状態より、予め設定さ
れたＶ／Ｆ線４に従って、出力周波数ｆ２及び出力電圧
■２へと加速する。これより負荷電流の急増や失速ある
いは騒音の問題がなくなり安定した加速が可能となる。FIG. 2 is an example of the relationship between the output frequency (F) and the output voltage (V) of the inverter device according to the present invention. That is, voltage correction control 1 is performed at the output frequency f1, and the output voltage is V.
It is assumed that the vehicle is operating at a constant speed with correction to n. At this time, the setting of the output frequency command of the voltage source inverter device changes from fl to f.
When the voltage changes to 2, the output voltage is first increased to 1, which is before the voltage correction control, as shown by the broken line in the figure. Then, from the state where the output voltage has returned to the output voltage ■1, the output voltage is accelerated to the output frequency f2 and the output voltage ■2 according to the preset V/F line 4. This eliminates problems such as rapid increase in load current, stalling, and noise, making stable acceleration possible.
［発明の効果〕
本発明は以上説明したように、定常運転時に負荷電流を
最小にする為に交流出力電圧を補正する制御を行なって
いても、交流電動様を加速する時にこれに優先して出力
電圧を補正前の電圧に復帰させてから、予め設定された
出力電圧（Ｖ）と出力周波数（Ｆ）との比に従って加速
させるようにしたため、負荷電流の急増や失速あるいは
騒音等の問題を防止し得て、安定した加速運転が可能に
なる優れた効果を奏する。[Effects of the Invention] As explained above, the present invention provides control to correct the AC output voltage in order to minimize the load current during steady operation, but when accelerating the AC motor, priority is given to this. After the output voltage is restored to the voltage before correction, it is accelerated according to the preset ratio of output voltage (V) and output frequency (F), which eliminates problems such as sudden increases in load current, stalls, and noise. This has an excellent effect of preventing this problem and enabling stable acceleration operation.
【図面の簡単な説明】
第１図は本発明の一実施例を示すフローチャート図、第
２図は本発明を適用した場合の電圧形インバータ装置の
出力周波数と出力電圧の関係を示す特性図、第３図は従
来の電圧形インバータ装置の出力周波数と出力電圧の関
係を示す特性図、第４図は従来例を示すフローチャート
図、第５図は従来の電圧形インバータ装置の出力周波数
と出力電圧との関係を示す特性図である。
１・・・出力電圧補正制御、 ２・・・割り込み、３・
・・加速制御、 ４・・・Ｖ／Ｆ線。
第２ 図
出７７屑ｊ疋粒Ｆ−−ヤ
第２図
エフ７周ｊ度粒 Ｆ□
第３図
第４図[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a flowchart diagram showing one embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the output frequency and output voltage of a voltage source inverter device when the present invention is applied; Fig. 3 is a characteristic diagram showing the relationship between the output frequency and output voltage of a conventional voltage source inverter device, Fig. 4 is a flowchart showing the conventional example, and Fig. 5 is an output frequency and output voltage of a conventional voltage source inverter device. FIG. 1... Output voltage correction control, 2... Interrupt, 3...
...Acceleration control, 4...V/F line. 2nd figure 77 grains
Claims (1)
圧の補正制御を行なう電圧形インバータ装置において、
この電圧形インバータ装置の出力周波数指令設定値を検
出してその変化状態を監視し、これが加速方向に変化し
た場合には前記出力電圧の補正制御に優先して前記電圧
形インバータ装置の出力電圧を前記補正制御前の出力電
圧まで復帰させてから、予め設定された出力電圧（Ｖ）
と出力周波数（Ｆ）の比（Ｖ／Ｆ）に従つて加速させる
ことを特徴とする電圧形インバータ装置の制御方法。In a voltage source inverter device that detects the load current and performs correction control of the AC output voltage so that it is minimized,
The output frequency command set value of the voltage source inverter device is detected and its change state is monitored, and if this changes in the acceleration direction, the output voltage of the voltage source inverter device is changed with priority over the correction control of the output voltage. After returning the output voltage to the level before the correction control, the output voltage (V) is set in advance.
A control method for a voltage source inverter device, characterized in that the voltage source inverter device is accelerated according to the ratio (V/F) of the output frequency (F) and the output frequency (F).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61146066A JPS633676A (en) | 1986-06-24 | 1986-06-24 | Control method for voltage type inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61146066A JPS633676A (en) | 1986-06-24 | 1986-06-24 | Control method for voltage type inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS633676A true JPS633676A (en) | 1988-01-08 |
Family
ID=15399313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61146066A Pending JPS633676A (en) | 1986-06-24 | 1986-06-24 | Control method for voltage type inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS633676A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017017839A1 (en) * | 2015-07-30 | 2017-02-02 | 三菱電機株式会社 | Motor driving device, and heat pump apparatus, refrigeration/air-conditioning apparatus, and air blowing apparatus using motor driving device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609395A (en) * | 1983-06-25 | 1985-01-18 | Yaskawa Electric Mfg Co Ltd | Operating method of induction motor |
-
1986
- 1986-06-24 JP JP61146066A patent/JPS633676A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609395A (en) * | 1983-06-25 | 1985-01-18 | Yaskawa Electric Mfg Co Ltd | Operating method of induction motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017017839A1 (en) * | 2015-07-30 | 2017-02-02 | 三菱電機株式会社 | Motor driving device, and heat pump apparatus, refrigeration/air-conditioning apparatus, and air blowing apparatus using motor driving device |
| JPWO2017017839A1 (en) * | 2015-07-30 | 2017-08-31 | 三菱電機株式会社 | Motor drive device, heat pump device using the motor drive device, refrigeration air conditioner, and blower |
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