JPH05260608A - Controller for vvvf inverter - Google Patents

Controller for vvvf inverter

Info

Publication number
JPH05260608A
JPH05260608A JP4050453A JP5045392A JPH05260608A JP H05260608 A JPH05260608 A JP H05260608A JP 4050453 A JP4050453 A JP 4050453A JP 5045392 A JP5045392 A JP 5045392A JP H05260608 A JPH05260608 A JP H05260608A
Authority
JP
Japan
Prior art keywords
output
idling
voltage command
command value
voltage
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
JP4050453A
Other languages
Japanese (ja)
Other versions
JP3064638B2 (en
Inventor
Akihiko Ujiie
昭彦 氏家
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 JP4050453A priority Critical patent/JP3064638B2/en
Publication of JPH05260608A publication Critical patent/JPH05260608A/en
Application granted granted Critical
Publication of JP3064638B2 publication Critical patent/JP3064638B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

Landscapes

  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To prevent an overexcitation at the time of readherence after slips of wheels by correcting a voltage command value in a direction for lowering it when the slips of the wheels are sensed during driving of a motor with a VVVF (variable voltage variable frequency) generated by converting an input DC voltage as a voltage command value. CONSTITUTION:A voltage command operator 15 calculates and outputs a voltage command value VD based on a modulation factor obtained from a DC input voltage and an output frequency of an inverter. On the other hand, when a slip is sensed from a rotating frequency of a motor, a slip flag outputs '1' to switch switching units 17, 18 to '1' side. The unit 17 outputs a coefficient smaller than '1' such as '0.95', multiplies it by the value VD by a multiplier 20 to correct the command value to a smaller value, and outputs it from the unit 18 as a voltage command. When the output of the flag becomes '0', the units 17, 18 are switched to '0' side, the value VD is multiplied by the coefficient '1' by the multiplier 20, gradually returned to an original value through a temporary delay element 19, and output from the unit 18. Thus, an overexcitation at the time of readherence is prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えば電鉄用主電動機
を駆動する装置に用いられるVVVFインバータの制御
装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a VVVF inverter used in a device for driving a main motor for electric railways, for example.

【0002】[0002]

【従来の技術】図3は電鉄用主電動機を駆動する回路を
示す概略構成図であり、パンタグラフ1にき電された交
流電圧は、主変圧器2により降圧され、コンバータ3に
より直流電圧に変換され、フィルタコンデンサ4により
平滑される。フィルタコンデンサ4には、並列にVVV
Fインバータ5が接続され、直流電圧を可変電圧、可変
周波数の3相交流に変換して交流電動機6の可変速運転
を行う。
2. Description of the Related Art FIG. 3 is a schematic configuration diagram showing a circuit for driving a main motor for electric railways. An AC voltage fed to a pantograph 1 is stepped down by a main transformer 2 and converted into a DC voltage by a converter 3. And is smoothed by the filter capacitor 4. The filter capacitor 4 is connected to VVV in parallel.
The F inverter 5 is connected to convert a DC voltage into a three-phase AC having a variable voltage and a variable frequency to perform a variable speed operation of the AC motor 6.

【0003】この具体的な制御は以下のように行われ
る。主電動機6の各相の電流が変流器14により検出さ
れ、これが実効値演算回路8により実効値IMRに変換
される。一方、主電動機6の周波数は、パルスジェネレ
ータ7により検出され、周波数演算回路9により電動機
周波数FRを演算する。電動機周波数FRは、空転検知
回路10により監視され、空転が発生した場合には、主
電動機電流指令値IM* より、電流値−ΔIM* を減算
することにより、主電動機6の電流値を減じ、トルクを
減少することにより再粘着を図る。
This concrete control is performed as follows.
It The current of each phase of the main motor 6 is detected by the current transformer 14.
This is converted into an effective value IMR by the effective value calculation circuit 8.
To be done. On the other hand, the frequency of the main motor 6 is
Detected by the motor 7 and the frequency calculation circuit 9
The frequency FR is calculated. Motor frequency FR detects slip
If the idling occurs as monitored by the circuit 10, the main
Motor current command value IM* Therefore, current value-ΔIM* Subtract
By reducing the current value of the main motor 6 and increasing the torque
Re-adhesion is attempted by decreasing.

【0004】以上のように補正された主電動機指令IM
* ' に、実効値演算回路8で検出された実効値IMRを
一致するように、補償制御回路11によりすべり周波数
Fsを演算し、周波数演算回路9によりモータ周波数演
算回路9により演算される電動機周波数FRを足してイ
ンバータ周波数F2 を演算する。インバータ周波数F2
と、このインバータ周波数F2 により演算される変調率
ALにより、PWM変調回路16により、PWM変調回
路16により変調され、パルスとしてインバータ5に与
えられる。この場合、変調率ALは、主電動機6に与え
られる電圧を制御するものであるが、主電動機6に与え
る励磁電流を一定にするように、(1)式で与えられ
る。 AL=FI/VD ……(1) ここで、VDはコンバータ3の出力電圧=インバータ5
の入力電圧である。空転中は、インバータ周波数FI
は、急激に増加するため、(1)式により変調率ALも
過大となる。
The main motor command IM corrected as described above
* ', The slip frequency Fs is calculated by the compensation control circuit 11 so that the effective value IMR detected by the effective value calculation circuit 8 is matched, and the motor frequency FR calculated by the frequency calculation circuit 9 by the motor frequency calculation circuit 9 is calculated. To calculate the inverter frequency F2. Inverter frequency F2
Then, the modulation rate AL calculated by the inverter frequency F2 is modulated by the PWM modulation circuit 16 by the PWM modulation circuit 16 and given to the inverter 5 as a pulse. In this case, the modulation factor AL controls the voltage applied to the main motor 6, and is given by the equation (1) so that the exciting current applied to the main motor 6 is constant. AL = FI / VD (1) where VD is the output voltage of the converter 3 = the inverter 5
Is the input voltage of. Inverter frequency FI during idling
, The modulation rate AL becomes too large according to the equation (1).

【0005】[0005]

【発明が解決しようとする課題】以上述べたように、従
来の装置にあっては、空転時には主電動機電流指令値I
* より、電流値−ΔIM* を減じることで再粘着を図
っていたが、コンバータ出力電圧は変えていなかったた
めに、主電動機6が再粘着しそうとしたときに、主電動
機6に与えられる電圧が過大となり、このとき主電動機
6が過励磁となり、主電動機6に流れる電流が過大にな
る場合があった。本発明の目的は、空転後の再粘着時の
過励磁を防止することができるVVVFインバータの制
御装置を提供することにある。
As described above, in the conventional device, the traction motor current command value I when idling.
M * From the current value −ΔIM * However, since the converter output voltage was not changed, the voltage applied to the main electric motor 6 became excessive when the main electric motor 6 was about to re-adhesive. May be over-excited and the current flowing through the main motor 6 may become excessive. An object of the present invention is to provide a control device for a VVVF inverter that can prevent overexcitation during re-adhesion after idling.

【0006】[0006]

【課題を解決するための手段】本発明は前記目的を達成
するため、請求項1に対応する発明は、以下のような構
成を備えている。すなわち、電動機の回転周波数から空
転を検知し、空転時に空転フラグを出力する空転検知回
路と、前記インバータの出力周波数と前記インバータの
入力電圧により変調率を演算し、これに基づき前記電圧
指令値を演算する演算回路と、空転検知回路から空転フ
ラグが出力されたときのみ、所定の係数を出力する係数
器と、前記空転フラグが出力されたとき係数器から出力
される係数と前記電圧指令値を掛け算して補正電圧指令
値を出力する掛算器と、この掛算器からの補正電圧指令
値に対して1次遅れを与える1次遅れ要素と、この1次
遅れ要素の出力および前記掛算器の出力のいずれかを選
択出力可能であって、前記空転検知回路から空転フラグ
が出力されたとき前記電圧指令値として前記掛算器の出
力を出力する出力器とを具備している。
In order to achieve the above object, the present invention corresponding to claim 1 has the following configuration. That is, the idling is detected from the rotation frequency of the electric motor, the idling detection circuit that outputs the idling flag when idling, the modulation rate is calculated by the output frequency of the inverter and the input voltage of the inverter, and the voltage command value is calculated based on this. An arithmetic circuit for calculating, a coefficient unit that outputs a predetermined coefficient only when the idling flag is output from the idling detection circuit, a coefficient output from the coefficient unit when the idling flag is output, and the voltage command value A multiplier that multiplies and outputs a correction voltage command value, a first-order delay element that gives a first-order delay to the correction voltage command value from this multiplier, an output of this first-order delay element, and an output of the multiplier. An output device capable of selectively outputting any of the above, and outputting the output of the multiplier as the voltage command value when the idling flag is output from the idling detection circuit. .

【0007】[0007]

【作用】請求項1に対応する発明によれば、空転フラグ
が検知されたとき、インバータの電圧指令値が瞬時に絞
り込まれ、空転フラグが検知されている間は該絞り込み
が継続され、空転フラグが生じなくなったとき、前記電
圧指令値が徐々に元の値に戻されるので、従来装置で問
題であった空転後の再粘着時の過励磁を防止することが
できる。
According to the invention corresponding to claim 1, when the idling flag is detected, the voltage command value of the inverter is instantly narrowed down, and the narrowing is continued while the idling flag is detected, and the idling flag is continued. Since the voltage command value is gradually returned to the original value when no longer occurs, it is possible to prevent overexcitation during re-adhesion after idling, which was a problem in the conventional device.

【0008】[0008]

【実施例】以下、本発明の実施例について図面を参照し
て説明する。図1は本発明によるVVVFインバータの
制御装置の一実施例の一部を示すブロック図である。可
変電圧可変周波数(VVVF)インバータ5は、図3と
同様に交流電動機6を運転するものであって、コンバー
タ3の出力である直流を入力して交流に変換すると共
に、この出力電圧が電圧指令値となるように制御され
る。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a part of an embodiment of a control device for a VVVF inverter according to the present invention. The variable voltage variable frequency (VVVF) inverter 5 operates the AC electric motor 6 as in FIG. 3, receives the direct current, which is the output of the converter 3, and converts it into alternating current. It is controlled to be a value.

【0009】この制御装置は以下の構成からなってい
る。交流電動機6の回転周波数から空転を検知し、空転
時には空転フラグ「1」を出力し、また非空転時には空
転フラグ「0」を出力する空転検知回路(図示せず)
と、インバータ5の出力周波数とインバータ5の入力電
圧により変調率を演算する変調率演算回路(図示せず)
と、係数が例えば0.95と1.0のいずれかに切換え
可能であって、前記空転検知回路から空転フラグ「1」
が出力されたとき、係数を0.95に切換え、また空転
フラグ「0」のとき係数1.0に切換える係数切換えス
イッチ(係数器)17と、インバータ5の出力周波数と
インバータ5の入力電圧により変調率を演算する変調率
演算回路(図示せず)と、該変調率に基づき前記電圧指
令値VD* を演算する電圧指令演算回路15と、係数切
換えスイッチ17からの係数と空転フラグ「1」が出力
されたとき係数器から出力される係数と前記電圧指令値
VD* を掛け算して補正電圧指令値を出力する掛算器2
0と、掛算器20からの補正電圧指令値に対して1次遅
れを与える1次遅れ要素19と、1次遅れ要素19の出
力および掛算器20の出力のいずれかを切換え可能であ
って、前記空転検知回路から空転フラグ「1」が出力さ
れたときは、1次遅れ要素19を通さず前記掛算器20
の出力がそのまま電圧指令値として出力され、また空転
フラグ「0」のときは、前記掛算器20の出力が前記1
次遅れ要素19を介して電圧指令値として出力する切換
えスイッチ(出力器)18からなっている。
This control device has the following configuration.
It The idling is detected from the rotation frequency of the AC motor 6, and the idling is performed.
Sometimes the idling flag "1" is output, and when not idling
A slip detection circuit (not shown) that outputs a rotation flag “0”
And the output frequency of the inverter 5 and the input voltage of the inverter 5.
Modulation rate calculation circuit (not shown) that calculates the modulation rate by pressure
And the coefficient is switched to either 0.95 or 1.0
It is possible, and the idling flag "1" is output from the idling detection circuit.
When is output, the coefficient is switched to 0.95 and idle
A coefficient switching switch that switches to a coefficient of 1.0 when the flag is "0".
Switch (coefficient multiplier) 17 and the output frequency of the inverter 5
Modulation rate for calculating the modulation rate by the input voltage of the inverter 5
An arithmetic circuit (not shown) and the voltage finger based on the modulation factor.
VD* Voltage command calculation circuit 15 for calculating
The coefficient from the changeover switch 17 and the idling flag “1” are output.
Coefficient output from the coefficient unit and the voltage command value
VD* Multiplier 2 for multiplying by and outputting the corrected voltage command value
0 and the primary delay with respect to the correction voltage command value from the multiplier 20.
The output of the first-order lag element 19 that gives this and the first-order lag element 19
Either the force or the output of the multiplier 20 can be switched.
Then, the idling detection circuit outputs the idling flag "1".
When the delay time is exceeded, the multiplier 20 is bypassed without passing through the primary delay element 19.
Output as is as the voltage command value, and
When the flag is "0", the output of the multiplier 20 is 1
Switching to output as a voltage command value via the next delay element 19
E switch (output device) 18.

【0010】このような構成されているので、空転検知
回路から空転フラグ「1」が出力されると、切換えスイ
ッチ17,18が“1”側に切換えられる。このため、
掛算器20において、電圧指令値VD* と係数0.95
が掛け算され、補正電圧指令値が求められる。この補正
電圧指令値は、1次遅れ要素19を介さず直接切換えス
イッチ18を通してインバータ5の電圧指令として出力
される。
With this configuration, when the idling flag "1" is output from the idling detection circuit, the changeover switches 17 and 18 are turned to the "1" side. For this reason,
In the multiplier 20, the voltage command value VD * And coefficient 0.95
Is multiplied to obtain a correction voltage command value. This corrected voltage command value is output as a voltage command for the inverter 5 through the direct changeover switch 18 without passing through the primary delay element 19.

【0011】一方、空転検知回路から空転フラグ「0」
が出力されると、切換えスイッチ17,18が“0”側
に切換えられる。このため、電圧指令演算回路15の電
圧指令値VD* は掛算器20からそのまま出力され、こ
れが1次遅れ要素19を通してインバータ5の電圧指令
として出力されるので、電圧指令値VD* は図2のよう
に徐々に元に戻される。
On the other hand, the idling detection circuit outputs the idling flag "0".
Is output, the changeover switches 17 and 18 are changed over to the "0" side. Therefore, the voltage command value VD * of the voltage command calculation circuit 15 Is output as it is from the multiplier 20 and is output as a voltage command of the inverter 5 through the first-order delay element 19, so that the voltage command value VD * Is gradually restored as shown in FIG.

【0012】図2は以上述べた動作を示すタイムチャー
トであり、加速中に空転が発生すると、変調率ALは一
定の割合で増加し、空転フラグが「1」になったとき、
電圧指令値VD* は0.95倍され、また空転フラグが
「0」になったときは、徐々に、前述の(1)式の計算
値に戻される。この様なことから、空転後の再粘着時
に、過大電圧が交流電動機7に印加されることがなくな
り、過電流が流れない。
FIG. 2 is a time chart showing the above-mentioned operation. When idling occurs during acceleration, the modulation rate AL increases at a constant rate, and when the idling flag becomes "1",
Voltage command value VD * Is multiplied by 0.95, and when the idling flag becomes “0”, the value is gradually returned to the calculated value of the above-mentioned equation (1). Due to this, an excessive voltage is not applied to the AC motor 7 during re-adhesion after idling, and an overcurrent does not flow.

【0013】[0013]

【発明の効果】本発明によれば、空転後の再粘着時の過
励磁を防止することができるVVVFインバータの制御
装置を提供することができる。
According to the present invention, it is possible to provide a control device for a VVVF inverter capable of preventing overexcitation during re-adhesion after idling.

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

【図1】本発明によるVVVFインバータの制御装置の
一実施例の一部を示すブロック図。
FIG. 1 is a block diagram showing a part of an embodiment of a control device for a VVVF inverter according to the present invention.

【図2】図1の動作を説明するためのタイムチャート。FIG. 2 is a time chart for explaining the operation of FIG.

【図3】従来の電鉄用主電動機を駆動する主回路を示す
概略図。
FIG. 3 is a schematic diagram showing a main circuit for driving a conventional electric motor for electric railway.

【符号の説明】[Explanation of symbols]

15…電圧指令演算回路、17,18…切換えスイッ
チ、19…一時遅れ要素、20…掛算器。
15 ... Voltage command arithmetic circuit, 17, 18 ... Changeover switch, 19 ... Temporary delay element, 20 ... Multiplier.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 交流電動機を運転するものであって、直
流を入力して交流に変換すると共に、この出力電圧が電
圧指令値となるように制御される可変電圧可変周波数イ
ンバータにおいて、 前記電動機の回転周波数から空転を検知し、空転時に空
転フラグを出力する空転検知回路と、 前記インバータの出力周波数と前記インバータの入力電
圧により変調率を演算し、これに基づき前記電圧指令値
を演算する演算回路と、 前記空転検知回路から空転フラグが出力されたときの
み、所定の係数を出力する係数器と、 前記空転フラグが出力されたとき係数器から出力される
係数と前記電圧指令値を掛け算して補正電圧指令値を出
力する掛算器と、 この掛算器からの補正電圧指令値に対して1次遅れを与
える1次遅れ要素と、 この1次遅れ要素の出力および前記掛算器の出力のいず
れかを選択出力可能であって、前記空転検知回路から空
転フラグが出力されたとき前記電圧指令値として前記掛
算器の出力を出力する出力器と、 を具備したVVVFインバータの制御装置。
1. A variable voltage variable frequency inverter for driving an alternating current motor, wherein direct current is input and converted into alternating current, and the output voltage is controlled to be a voltage command value. An idling detection circuit that detects idling from the rotation frequency and outputs an idling flag when idling, and an arithmetic circuit that computes a modulation factor by the output frequency of the inverter and the input voltage of the inverter, and computes the voltage command value based on this. A coefficient unit that outputs a predetermined coefficient only when the idling flag is output from the idling detection circuit; and a coefficient output from the coefficient unit when the idling flag is output and the voltage command value are multiplied. A multiplier that outputs a correction voltage command value, a first-order delay element that gives a first-order delay to the correction voltage command value from this multiplier, and an output of this first-order delay element And an output device capable of selectively outputting one of the outputs of the multiplier, and outputting the output of the multiplier as the voltage command value when the idling flag is output from the idling detection circuit. Inverter control device.
JP4050453A 1992-03-09 1992-03-09 Control device for VVVF inverter Expired - Fee Related JP3064638B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4050453A JP3064638B2 (en) 1992-03-09 1992-03-09 Control device for VVVF inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4050453A JP3064638B2 (en) 1992-03-09 1992-03-09 Control device for VVVF inverter

Publications (2)

Publication Number Publication Date
JPH05260608A true JPH05260608A (en) 1993-10-08
JP3064638B2 JP3064638B2 (en) 2000-07-12

Family

ID=12859286

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4050453A Expired - Fee Related JP3064638B2 (en) 1992-03-09 1992-03-09 Control device for VVVF inverter

Country Status (1)

Country Link
JP (1) JP3064638B2 (en)

Also Published As

Publication number Publication date
JP3064638B2 (en) 2000-07-12

Similar Documents

Publication Publication Date Title
EP0293915B1 (en) Inverter control apparatus
KR100334555B1 (en) Regenerative braking control method and control device for electric vehicle
EP0691730A2 (en) Inverter control apparatus
WO2006004037A1 (en) Inverter device, and speed reducing method for ac electric motor
EP0526915A2 (en) Control system for controlling revolution speed of electric motor
JP3064638B2 (en) Control device for VVVF inverter
JP2914364B2 (en) Power converter
JPS61262006A (en) Controller of induction motor for vehicle
JP3660255B2 (en) Method and apparatus for controlling power converter
JP3511508B2 (en) Electric car control device
JP2004320853A (en) Power converter
JP2003339199A (en) Speed sensorless vector control inverter
JPH10262392A (en) Inverter controller
JP3323901B2 (en) Control device for linear motor electric vehicle
JP3255839B2 (en) AC elevator control device
JP2877577B2 (en) AC electric vehicle control device
JP3824206B2 (en) Linear induction motor electric vehicle control device
JP3524626B2 (en) Static power converter
JPH07288980A (en) Voltage controller for power converter
JP2005218186A (en) Controller for ac electric rolling stock
JPH06209579A (en) Power converter
JP3503202B2 (en) Inverter for driving induction motor
JP3153655B2 (en) Electric car control device
JP3751827B2 (en) Power converter
JP3261913B2 (en) Induction motor control device

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees