JPS62201068A - Controller for inverter - Google Patents
Controller for inverterInfo
- Publication number
- JPS62201068A JPS62201068A JP61040614A JP4061486A JPS62201068A JP S62201068 A JPS62201068 A JP S62201068A JP 61040614 A JP61040614 A JP 61040614A JP 4061486 A JP4061486 A JP 4061486A JP S62201068 A JPS62201068 A JP S62201068A
- Authority
- JP
- Japan
- Prior art keywords
- command
- voltage
- voltage command
- circuit
- inverter
- 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
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000012935 Averaging Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001052 transient effect Effects 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】
〔産業上の利用分野〕
この発明は、誘導電動機等の電動機の速度制御に使用さ
れるインバータの制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for an inverter used for speed control of an electric motor such as an induction motor.
第６図に、この種のインバータ制御装置の従来例をブロ
ック図で示す。図において、１は速度指令設定回路、２
は速度指令設定回路１の速度指令（信号）を受けて周波
数指令を作成する周波数指令作成回路、３は電動機、４
は電動機３を駆動するインバータである。このインバー
タ４は電圧／周波数比（Ｖ／Ｆ）一定に制御される。５
は電動機３の入力電流を検出する負荷電流検出回路、６
は電圧補正比率設定回路、７は電圧補正量演算回路であ
る。電圧補正量演算回路７は負荷電流検出回路５による
検出量と電圧比率設定回路６の設定比率から電圧補正量
を演算する。８は電圧指令作成回路であって、速度指令
と上記電圧補正量から電圧指令（信号）を作成する。９
は点弧信号作成回路であって、周波数指令と電圧指令か
ら点弧信号を作成してインバータ４に供給する。FIG. 6 shows a block diagram of a conventional example of this type of inverter control device. In the figure, 1 is a speed command setting circuit, 2
1 is a frequency command generation circuit that receives a speed command (signal) from the speed command setting circuit 1 and creates a frequency command; 3 is a motor; 4
is an inverter that drives the electric motor 3. This inverter 4 is controlled to have a constant voltage/frequency ratio (V/F). 5
6 is a load current detection circuit that detects the input current of the motor 3;
7 is a voltage correction ratio setting circuit, and 7 is a voltage correction amount calculation circuit. The voltage correction amount calculation circuit 7 calculates the voltage correction amount from the amount detected by the load current detection circuit 5 and the setting ratio of the voltage ratio setting circuit 6. Reference numeral 8 denotes a voltage command creation circuit, which creates a voltage command (signal) from the speed command and the voltage correction amount. 9
is an ignition signal generating circuit which generates an ignition signal from the frequency command and voltage command and supplies it to the inverter 4.
第３図は、上記速度指令Ｎと周波数指令Ｆとの関係を示
したものであり、また、第５図は、上記速度指令Ｎと電
圧指令■との関係を示す。FIG. 3 shows the relationship between the speed command N and the frequency command F, and FIG. 5 shows the relationship between the speed command N and the voltage command (2).
次に、この装置の動作について説明する。Next, the operation of this device will be explained.
上記インバータ４はＶ／Ｆが一定になるように制御され
るが、このＶ／Ｆ比一定制御だけでは、−電動機３の一
次抵抗や給電ケーブルによる電圧降下環により、特に、
低周波域においてトルク特性が低下する。このため、負
荷電流検出回路５により検出した電流量と電圧補正比率
設定回路６で設定した電圧補正比率から電圧補正量演算
回路７で電圧補正量■２を演算し該電圧補正量■２によ
り基本電圧指令Ｖｌ（第５図に破線で示す）を補正する
ことにより、負荷時のインバータ出力電圧Ｖの補正を行
い、電動機トルク特性を改善するようにしている。電圧
指令作成回路８では、第７図のフローチャートに示すよ
うに、速度指令Ｎに基本電圧指令変換定数に１を乗じて
基本電圧指令■１を求め、基本電圧指令■１に電圧補正
量■２を加算して電圧指令Ｖ（第５図に実線で示す）を
作成する。The inverter 4 is controlled so that the V/F is constant, but with only this constant V/F ratio control, the primary resistance of the electric motor 3 and the voltage drop ring due to the power supply cable, especially,
Torque characteristics deteriorate in the low frequency range. Therefore, the voltage correction amount calculation circuit 7 calculates the voltage correction amount ■2 from the current amount detected by the load current detection circuit 5 and the voltage correction ratio set by the voltage correction ratio setting circuit 6, and the voltage correction amount ■2 is calculated based on the voltage correction amount ■2. By correcting the voltage command Vl (shown by the broken line in FIG. 5), the inverter output voltage V under load is corrected, and the motor torque characteristics are improved. In the voltage command generation circuit 8, as shown in the flowchart of FIG. 7, the basic voltage command conversion constant is multiplied by 1 to the speed command N to obtain the basic voltage command ■1, and the voltage correction amount ■2 is added to the basic voltage command ■1. A voltage command V (shown by a solid line in FIG. 5) is created by adding the following.
なお、第４図に、負荷電流と電圧補正量との関係を電圧
補正比率をパラメータとして示す。Note that FIG. 4 shows the relationship between the load current and the voltage correction amount using the voltage correction ratio as a parameter.
従来の制御装置は、以上のように構成されているので、
負荷電流が増加すると、電動機あ一次抵抗や給電ケーブ
ルによる電圧降下が補正されるように、インバータ４の
出力電圧を増加させ、負荷電流が減少すると、電動機３
が過励磁とならないように、インバータ４の出力電圧を
低下させるため、インバータ出力電圧の変化により生ず
る過渡擾乱電流が流れ、これが負荷電流検出回路５によ
り検出されてフィードバックされるので、インバータ出
力電圧と電流がハンチングし制御が不安定になる場合が
あるという問題があった。Since the conventional control device is configured as described above,
When the load current increases, the output voltage of the inverter 4 is increased to compensate for the voltage drop due to the motor's primary resistance and the power supply cable, and when the load current decreases, the output voltage of the motor 3 is increased.
In order to reduce the output voltage of the inverter 4 to prevent over-excitation, a transient disturbance current generated by a change in the inverter output voltage flows, and this is detected by the load current detection circuit 5 and fed back, so that the inverter output voltage and There was a problem that the current may hunt and the control may become unstable.
この発明は上記した従来の問題を解消するためになされ
たもので、インバータ出力電圧と電流のハンチングを抑
制してインバータ出力を制御することができるインバー
タ制御装置を得ることを目的すとる。The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to obtain an inverter control device that can control the inverter output while suppressing hunting of the inverter output voltage and current.
この発明は上記目的を達成するため、前回作成した電圧
指令と今回作成した電圧指令の指令値平均値を電圧指令
としてインバータを制御する構成としたものである。In order to achieve the above object, the present invention is configured to control an inverter using an average command value of a voltage command created last time and a voltage command created this time as a voltage command.
この発明では、電圧指令が前回電圧指令と平均されるの
で、負荷電流変動時のインバータ出力電圧の制御が従来
に比して滑らかになり、インバータ出力電圧、電流のハ
ンチングが抑制される。In this invention, since the voltage command is averaged with the previous voltage command, the control of the inverter output voltage when the load current fluctuates becomes smoother than before, and hunting of the inverter output voltage and current is suppressed.
第１図はこの発明の一実施例をブロック図で示したもの
で、前記電圧指令作成回路８に代えて、電圧指令作成回
路１１を有する点において第６図の従来のものと相違す
る。他の構成は同じであるので、同一構成要素には同一
符号を付して示しである。FIG. 1 shows a block diagram of an embodiment of the present invention, which differs from the conventional one shown in FIG. 6 in that it includes a voltage command creation circuit 11 in place of the voltage command creation circuit 8. Since the other configurations are the same, the same components are denoted by the same reference numerals.
電圧指令作成回路１１は、第２図のフローチャトに示す
ように、（１）速度指令Ｎに基本電圧指令変換定数に１
を乗じて基本電圧指令■１を求め、（２）基本電圧指令
■１に電圧補正量■２を加算して電圧指令■を求め、（
３）この電圧指令Ｖに、前回に作成した電圧指令ＭＶを
平均して電圧指令■（第５図に実線で示す）を作成し、
（４）ステップ（３）の電圧指令を記憶し、次の演算サ
イクルのためのデータとする。As shown in the flowchart of FIG. 2, the voltage command generation circuit 11 (1) sets the speed command N to the basic voltage command conversion constant by 1
(2) Add the voltage correction amount ■2 to the basic voltage command ■1 to find the voltage command ■, and (
3) Create voltage command ■ (shown by the solid line in Figure 5) by averaging the voltage command MV created last time with this voltage command V,
(4) Store the voltage command in step (3) and use it as data for the next calculation cycle.
従って、本実施例では、負荷電流が変化した場合、その
変化に応じて電圧指令が補正されるが、この補正された
電圧指令（Ｖａとする）がそのまま点弧指令作成回路９
に送出されるではなくて、この電圧指令の指令値と今回
の補正動作まえの電圧指令ＭＶの指令値との平均値が電
圧指令Ｖとして点弧信号作成回路９に送出される。この
ため、電圧指令の変化分（ＭＶ−Ｖａ／２）は前記従来
方式の場合の変化分（ＭＶ−Ｖａ）より小さくなり、負
荷電流変動時の電圧指令の変化が従来に比し滑らかとな
るので、インバータの出力・電流のハンチングは抑制さ
れる。Therefore, in this embodiment, when the load current changes, the voltage command is corrected according to the change, but this corrected voltage command (denoted as Va) remains unchanged at the ignition command generation circuit 9.
Instead, the average value of the command value of this voltage command and the command value of the voltage command MV before the current correction operation is sent to the ignition signal generation circuit 9 as the voltage command V. Therefore, the amount of change in the voltage command (MV-Va/2) is smaller than the amount of change (MV-Va) in the conventional method, and the change in voltage command when the load current fluctuates is smoother than in the past. Therefore, hunting of the inverter output/current is suppressed.
この発明は以上説明した通り、電圧指令が前回電圧指令
との平均であるので、電圧指令の変化が従来に比し滑ら
かになり、従来に比し、インバータ出力電圧・電流のハ
ンチングを抑制することできるので、制御の安定度を高
めることができる。As explained above, in this invention, since the voltage command is the average of the previous voltage command, the change in the voltage command becomes smoother than in the past, and hunting in the inverter output voltage and current is suppressed compared to the past. Therefore, the stability of control can be improved.
、第１図はこの発明の実施例を示すブロック図、第２図
は上記実施例における電圧指令作成回路の動作フローチ
ャート、第３図は速度指令−周波数指令特性図、第４図
は負荷電流量−電圧補正量特性図、第５図は速度指令−
電圧指令特性図、第６図は従来のインバータ制御装置の
ブロック図、第７図は上記従来装置における電圧指令作
成回路の動作フローチャートである。
図において、■−速度指令設定回路、４−負荷電流検出
回路、６・−・電圧補正比率設定回路、７−電圧補正量
演算回路、１１・〜電圧指令作成回路。
なお、図中、同一符号は同一または相当部分を示す。, Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an operation flowchart of the voltage command generation circuit in the above embodiment, Fig. 3 is a speed command-frequency command characteristic diagram, and Fig. 4 is a load current amount. - Voltage correction amount characteristic diagram, Figure 5 is speed command -
FIG. 6 is a block diagram of a conventional inverter control device, and FIG. 7 is an operation flowchart of a voltage command generation circuit in the conventional device. In the figure, ■ - speed command setting circuit, 4 - load current detection circuit, 6 - voltage correction ratio setting circuit, 7 - voltage correction amount calculation circuit, 11 - voltage command generation circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
し、該電圧補正量により基準電圧指令値を補正して電圧
指令を作成するインバータの制御装置において、前回作
成した電圧指令と今回作成した電圧指令の指令値平均値
を電圧指令としてインバータを制御することを特徴とす
るインバータ制御装置。In an inverter control device that detects the load current, calculates a voltage correction amount based on the detected value, and corrects the reference voltage command value using the voltage correction amount to create a voltage command, the voltage command created previously and the voltage command created this time are An inverter control device that controls an inverter using an average command value of voltage commands as a voltage command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61040614A JPS62201068A (en) | 1986-02-24 | 1986-02-24 | Controller for inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61040614A JPS62201068A (en) | 1986-02-24 | 1986-02-24 | Controller for inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62201068A true JPS62201068A (en) | 1987-09-04 |
Family
ID=12585402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61040614A Pending JPS62201068A (en) | 1986-02-24 | 1986-02-24 | Controller for inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62201068A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6910377B1 (en) | 2000-04-28 | 2005-06-28 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Fluid reservoir with level measurement and a dosing system, a withdrawal system and a combined dosing/withdrawal system |
-
1986
- 1986-02-24 JP JP61040614A patent/JPS62201068A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6910377B1 (en) | 2000-04-28 | 2005-06-28 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Fluid reservoir with level measurement and a dosing system, a withdrawal system and a combined dosing/withdrawal system |
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