JP5169060B2 - Power failure detection device for power regeneration inverter device - Google Patents

Power failure detection device for power regeneration inverter device Download PDF

Info

Publication number
JP5169060B2
JP5169060B2 JP2007203974A JP2007203974A JP5169060B2 JP 5169060 B2 JP5169060 B2 JP 5169060B2 JP 2007203974 A JP2007203974 A JP 2007203974A JP 2007203974 A JP2007203974 A JP 2007203974A JP 5169060 B2 JP5169060 B2 JP 5169060B2
Authority
JP
Japan
Prior art keywords
power
power failure
failure detection
regeneration inverter
input
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.)
Active
Application number
JP2007203974A
Other languages
Japanese (ja)
Other versions
JP2009044781A (en
Inventor
勝之 渡邉
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.)
Meidensha Corp
Original Assignee
Meidensha 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 Meidensha Corp filed Critical Meidensha Corp
Priority to JP2007203974A priority Critical patent/JP5169060B2/en
Publication of JP2009044781A publication Critical patent/JP2009044781A/en
Application granted granted Critical
Publication of JP5169060B2 publication Critical patent/JP5169060B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Measurement Of Current Or Voltage (AREA)
  • Inverter Devices (AREA)

Description

本発明はモータを駆動又は回生運転するインバータ装置の停電検出装置に関するものである。   The present invention relates to a power failure detection device for an inverter that drives or regenerates a motor.

負荷であるモータを駆動又は回生運転するインバータ装置において、図２で示すように入力相電流波形を正弦波で、且つ電源相電圧と同相（力率１）にし、回生運転時や減速時に発生したエネルギーを電源に戻すことが行われている。
このようなインバータ装置で、図示省略のモータが回生状態となったときインバータ１は回生運転を行うが、その回生運転中に停電が発生すると交流電源（モータ）からの回生エネルギーの戻り先がなくなってコンデンサＣの端子電圧が上昇し、直流回路電圧の上昇による過電圧状態となってインバータ装置の故障原因となる。 In an inverter device that drives or regenerates a motor that is a load, as shown in FIG. 2, the input phase current waveform is a sine wave and the same phase as the power supply phase voltage (power factor 1), and is generated during regenerative operation or deceleration. Energy is being returned to the power source.
In such an inverter device, the inverter 1 performs a regenerative operation when a motor (not shown) is in a regenerative state. However, when a power failure occurs during the regenerative operation, there is no return destination of the regenerative energy from the AC power source (motor). As a result, the terminal voltage of the capacitor C rises, resulting in an overvoltage state due to the rise of the DC circuit voltage, causing a failure of the inverter device.

対策としては、速やかに停電を検出して回生エネルギーが低減するようモータの減速動作を遅くしたり、回生モードでの運転を中止する必要がある。停電には様々な状態があり、例えば、落雷等が原因で電源系統の上位で遮断器が開放されるような場合には、同じ電源系統内に回生電力を消費してくれる負荷があれば運転を継続できる可能性がある。
しかし、ホイストや電気車のように摺動式の給電装置が使われていて、その接触が断たれたような状態では回生電力の消費は期待できず、装置を停止させなければならない。 As countermeasures, it is necessary to detect the power failure promptly and slow down the motor deceleration operation to reduce the regenerative energy or to stop the operation in the regenerative mode. There are various states of power outages. For example, when a circuit breaker is opened at the top of the power system due to lightning, etc., operation is possible if there is a load that consumes regenerative power in the same power system. May continue.
However, a sliding type power supply device such as a hoist or an electric vehicle is used, and in a state where the contact is cut off, consumption of regenerative power cannot be expected, and the device must be stopped.

停電の検出方法としては、特許文献１や特許文献２等を含めて幾つかの方法が公知となっており、一般的には、図２で示すように電源電圧検出部３を介して検出された相電圧検出値を絶対値演算回路４で演算し、その絶対値はフィルタ回路５において処理された後、比較部６で停電検出レベルと比較され、停電検出レベル以下となったときに停電検出信号として出力される。
特許第３１４４８４８号 特開平７−３２２６２６ As a method for detecting a power failure, several methods are known, including Patent Document 1 and Patent Document 2, and are generally detected via a power supply voltage detector 3 as shown in FIG. The phase voltage detection value is calculated by the absolute value calculation circuit 4, and the absolute value is processed in the filter circuit 5, and then compared with the power failure detection level by the comparison unit 6, and when the power failure detection level falls below the power failure detection level Output as a signal.
Japanese Patent No. 3144848 JP-A-7-322626

上記特許文献は、停電時において、受電点に電源周波数以外のＰＷＭキャリア周波数成分が現れることに着目し、その大きさが予め設定したレベルを超えたときに停電と判定している。しかし、実際の電源回生インバータ装置では電源系統にＰＷＭキャリア周波数成分のリップル電流を流出させないために、特別な場合を除きＬＣフィルタ２が設置されている。したがって、停電が発生しても受電点にＰＷＭキャリア周波数成分は現れにくく、停電を検出することが困難となっている。   The above patent document focuses on the fact that a PWM carrier frequency component other than the power supply frequency appears at the power receiving point at the time of a power failure, and determines that a power failure occurs when the magnitude exceeds a preset level. However, in an actual power regeneration inverter device, the LC filter 2 is installed except in special cases in order to prevent the ripple current of the PWM carrier frequency component from flowing into the power system. Therefore, even if a power failure occurs, the PWM carrier frequency component hardly appears at the power receiving point, and it is difficult to detect the power failure.

本発明が目的とするとこは、例え、ＬＣフィルタ２が設置されていても確実に停電を検出することの出来る電源回生インバータ装置の停電検出装置を提供することにある。   An object of the present invention is to provide a power failure detection device for a power regeneration inverter device that can reliably detect a power failure even if the LC filter 2 is installed.

本発明の請求項１は、電源回生インバータの交流出力側と負荷である交流電源間に電源電圧検出器を設け、この電源電圧検出器により検出された検出電圧値と予め設定された停電検出レベル値を比較部に入力して停電を検出するものにおいて、
前記比較部へ入力する信号の切換部を設け、電源回生インバータの運転停止時には前記検出電圧値を切換部の一方の端子を介して比較部に入力すると共に、電源回生インバータの運転時には、インバータの電流制御部の出力側で生成された電圧指令値を前記切換部の他方の端子を介して比較部に入力するよう構成したことを特徴としたものである。 Claim 1 of the present invention provides a power supply voltage detector between the AC output side of the power regeneration inverter and the AC power supply as a load, and the detected voltage value detected by the power supply voltage detector and a preset power failure detection level. In what detects a power outage by entering a value into the comparator,
A switching unit for a signal input to the comparison unit is provided, and when the operation of the power regeneration inverter is stopped, the detected voltage value is input to the comparison unit via one terminal of the switching unit, and when the power regeneration inverter is operated, The voltage command value generated on the output side of the current control unit is input to the comparison unit via the other terminal of the switching unit.

本発明の請求項２は、前記切換部の２つの端子に入力される信号は、それぞれ３相電圧の絶対値とし、且つ切換部の入力端子の切換は電源回生インバータの運転信号であることを特徴とした   According to a second aspect of the present invention, the signals input to the two terminals of the switching unit are the absolute values of the three-phase voltages, respectively, and the switching of the input terminal of the switching unit is an operation signal of the power regeneration inverter. Featured

以上のとおり、本発明によれば、特に、摺動式の給電装置が使われていても、インバータ装置の回生運転中に停電が発生した場合、停電検出を行う比較部への検出信号は電流制御部の出力である電圧指令の絶対値であるため、確実に停電を検出することができる。   As described above, according to the present invention, particularly when a power failure occurs during the regenerative operation of the inverter device, even if a sliding power supply device is used, the detection signal to the comparison unit that detects the power failure is a current. Since it is the absolute value of the voltage command which is the output of the control unit, a power failure can be detected reliably.

電源回生インバータ装置は常に力率１の状態で運転しているため、インバータの出力電圧は電源電圧と略つりあっている。本発明はこの点に着目し、制御装置の電流制御部の出力である電圧指令の絶対値と停電レベルとを比較し、その差信号の大小で停電の有無を判断するものである。以下実施例に基づいて詳述する。   Since the power regeneration inverter device is always operated with a power factor of 1, the output voltage of the inverter is substantially balanced with the power supply voltage. The present invention pays attention to this point, and compares the absolute value of the voltage command, which is the output of the current control unit of the control device, with the power failure level, and determines whether there is a power failure based on the magnitude of the difference signal. This will be described in detail below based on examples.

図１は、本発明の実施例を示す構成図で、１は電源回生機能を有するインバータで、通常は整流器などよりなる直流電源１１を電源として交流電圧に変換し、図示省略のモータへ電力を供給する。２はリップル電流除去用のＬＣフィルタ、３は電源電圧検出部で、入力電流波形を正弦波にするために必要とする相電圧を検出し、零クロス検出回路７を通して理想正弦波発生回路８に出力する。理想正弦波発生回路８によって生成されたＵ相用SINθ信号とW相用 SIN(θ＋１２０°)信号は電流制御部９の乗算部にそれぞれ出力される。   FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 is an inverter having a power regeneration function, which is usually converted into an AC voltage using a DC power source 11 composed of a rectifier or the like as a power source, and power is supplied to a motor not shown. Supply. Reference numeral 2 denotes an LC filter for removing ripple current, and reference numeral 3 denotes a power supply voltage detection unit, which detects a phase voltage required for making the input current waveform into a sine wave, and supplies the ideal sine wave generation circuit 8 through the zero cross detection circuit 7. Output. The U-phase SINθ signal and the W-phase SIN (θ + 120 °) signal generated by the ideal sine wave generation circuit 8 are respectively output to the multiplication unit of the current control unit 9.

電源電圧検出部３により検出された検出値は絶対値演算回路４にも出力されて絶対値演算が実行され、フィルタ回路５により処理された後、検出値Vabsとして切換部１３の一方の端子ａに出力される。１４はインバータ１の直流電圧を検出する絶縁アンプで、その出力Vdcは減算部１５に出力される。減算部１５では設定値Vdc*との差演算が実行され、差信号は電流制御部９に出力されて差信号に基づく電流制御信号の演算が行われる。演算された２相の電流制御信号は２相／３相変換部１０において３相の電圧指令値Ｖu*、Ｖv*、Ｖw*に変換され、PWM増幅部１２を経てインバータ１の各スイッチング素子を制御する。 The detection value detected by the power supply voltage detection unit 3 is also output to the absolute value calculation circuit 4, the absolute value calculation is executed, and after processing by the filter circuit 5, one terminal a of the switching unit 13 is detected as the detection value Vabs. Is output. 14 is an insulation amplifier that detects the DC voltage of the inverter 1, and its output Vdc is output to the subtractor 15. The subtraction unit 15 performs a difference calculation with the set value Vdc *, and the difference signal is output to the current control unit 9 to calculate a current control signal based on the difference signal. The calculated two-phase current control signal is converted into three-phase voltage command values Vu * , Vv * , and Vw * in the two-phase / three-phase converter 10, and each switching element of the inverter 1 is passed through the PWM amplifier 12. Control.

また、電圧指令値は第２の絶対値演算回路１６にも出力されて絶対値演算が実行され、その値Vabs*は切換部１３の他方の端子ｂに出力される。切換部１３は、インバータ装置の停止から始動までの電圧指令Ｖu*、Ｖv*、Ｖw*が０の期間中は端子ａ側の信号、すなわち、検出値Vabsを比較部１７に出力して停電検出レベルと比較するよう切換えられ、また、インバータ装置が運転されて電圧指令Ｖu*、Ｖv*、Ｖw*が発生した後は、端子をｂ側に切換えて絶対値Vabs*と停電検出レベルと比較するよう切換制御される。 The voltage command value is also output to the second absolute value calculation circuit 16 to perform absolute value calculation, and the value Vabs * is output to the other terminal b of the switching unit 13. The switching unit 13 outputs a signal on the terminal a side, that is, the detection value Vabs to the comparison unit 17 while the voltage commands Vu * , Vv * , Vw * from the stop to start of the inverter device are 0, and detects a power failure. After the inverter is operated and the voltage commands Vu * , Vv * , Vw * are generated, the terminal is switched to the b side and the absolute value Vabs * is compared with the power failure detection level. The switching is controlled as follows.

運転前での電圧指令は０であり、端子ａ側への接続のままでは停電と判定されて運転開始ができなくなる。このため、本発明ではインバータ装置の運転信号により切換部１３の端子をａ側からｂ側に切替えることによって比較部１３への検出信号の切替えを実行し、始動時でも停電検出を可能としている。
以上のように、本発明によれば、インバータ１が電源回生のためのコンバータとなり、回生運転中に停電が発生しても、比較部１７への検出信号は電流制御部９の出力である電圧指令の絶対値であるため、比較部１７は確実に停電を検出することが可能となる。 The voltage command before the operation is 0, and if the connection to the terminal a side remains, it is determined that a power failure has occurred and the operation cannot be started. For this reason, in the present invention, the detection signal is switched to the comparison unit 13 by switching the terminal of the switching unit 13 from the a side to the b side by the operation signal of the inverter device, so that the power failure can be detected even at the start.
As described above, according to the present invention, the inverter 1 becomes a converter for power regeneration, and even if a power failure occurs during the regenerative operation, the detection signal to the comparison unit 17 is the voltage that is the output of the current control unit 9. Since it is the absolute value of the command, the comparison unit 17 can reliably detect a power failure.

本発明の実施形態を示す構成図。The block diagram which shows embodiment of this invention. 従来の電源回生インバータ装置の停電検出装置の構成図。The block diagram of the power failure detection apparatus of the conventional power regeneration inverter apparatus.

符号の説明Explanation of symbols

１… インバータ
２… ＬＣフィルタ
３… 電源電圧検出部
４、１６… 絶対値演算回路
５… フィルタ回路
６、１７… 比較部
９… 電流制御部
１０… ２相／３相変換部
１３… 切換部 DESCRIPTION OF SYMBOLS 1 ... Inverter 2 ... LC filter 3 ... Power supply voltage detection part 4, 16 ... Absolute value calculation circuit 5 ... Filter circuit 6, 17 ... Comparison part 9 ... Current control part 10 ... Two-phase / 3-phase conversion part 13 ... Switching part

Claims (2)

電源回生インバータの交流出力側と負荷である交流電源間に電源電圧検出器を設け、この電源電圧検出器により検出された検出電圧値と予め設定された停電検出レベル値を比較部に入力して停電を検出するものにおいて、
前記比較部へ入力する信号の切換部を設け、電源回生インバータの運転停止時には前記検出電圧値を切換部の一方の端子を介して比較部に入力すると共に、電源回生インバータの運転時には、インバータの電流制御部の出力側で生成された電圧指令値を前記切換部の他方の端子を介して比較部に入力するよう構成したことを特徴とした電源回生インバータ装置の停電検出装置。 A power supply voltage detector is installed between the AC output side of the power regeneration inverter and the AC power supply that is the load, and the detected voltage value detected by this power supply voltage detector and the preset power failure detection level value are input to the comparator. For detecting power outages,
A switching unit for a signal input to the comparison unit is provided, and when the operation of the power regeneration inverter is stopped, the detected voltage value is input to the comparison unit via one terminal of the switching unit, and when the power regeneration inverter is operated, A power failure detection device for a power regeneration inverter device, wherein a voltage command value generated on the output side of the current control unit is input to the comparison unit via the other terminal of the switching unit. 前記切換部の２つの端子に入力される信号は、それぞれ３相電圧の絶対値とし、且つ切換部の入力端子の切換は電源回生インバータの運転信号であることを特徴とした請求項１記載の電源回生インバータ装置の停電検出装置。 The signal input to the two terminals of the switching unit is an absolute value of a three-phase voltage, respectively, and the switching of the input terminal of the switching unit is an operation signal of a power regeneration inverter. Power failure detection device for power regeneration inverter device.
JP2007203974A 2007-08-06 2007-08-06 Power failure detection device for power regeneration inverter device Active JP5169060B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007203974A JP5169060B2 (en) 2007-08-06 2007-08-06 Power failure detection device for power regeneration inverter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007203974A JP5169060B2 (en) 2007-08-06 2007-08-06 Power failure detection device for power regeneration inverter device

Publications (2)

Publication Number Publication Date
JP2009044781A JP2009044781A (en) 2009-02-26
JP5169060B2 true JP5169060B2 (en) 2013-03-27

Family

ID=40444929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007203974A Active JP5169060B2 (en) 2007-08-06 2007-08-06 Power failure detection device for power regeneration inverter device

Country Status (1)

Country Link
JP (1) JP5169060B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5670505B2 (en) 2013-04-15 2015-02-18 ファナック株式会社 Motor control device having power failure determination means
JP6387530B2 (en) * 2013-10-21 2018-09-12 パナソニックＩｐマネジメント株式会社 Power control device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3158212B2 (en) * 1991-08-20 2001-04-23 株式会社日立製作所 Power conversion system and control method thereof
JP3144848B2 (en) * 1991-09-04 2001-03-12 東海旅客鉄道株式会社 Power converter for electric vehicles
JP2762003B2 (en) * 1992-08-26 1998-06-04 株式会社日立製作所 Power converter
JPH0715988A (en) * 1993-06-23 1995-01-17 Fanuc Ltd Induction-motor controller
JP3687335B2 (en) * 1998-03-31 2005-08-24 富士電機システムズ株式会社 Power failure detection device for power converter
JP4664699B2 (en) * 2005-02-10 2011-04-06 株式会社東芝 Parallel operation controller for power converter

Also Published As

Publication number Publication date
JP2009044781A (en) 2009-02-26

Similar Documents

Publication Publication Date Title
US8259426B2 (en) Variable frequency drive and methods for filter capacitor fault detection
US8760095B2 (en) Rotator control device, rotator system, vehicle, electric car and electric generation system
US8319466B2 (en) Modular line-to-ground fault identification
JP4431604B2 (en) Converter device
JP5947109B2 (en) Uninterruptible power supply, control method of uninterruptible power supply
JP2008061322A (en) Three-phase converter, inverter and module
JP2005192314A (en) Power converter
KR101799957B1 (en) Motor control apparatus
JPWO2008072348A1 (en) Inverter device
Freire et al. A voltage-based approach for open-circuit fault diagnosis in voltage-fed SVM motor drives without extra hardware
JP2010246182A (en) Failure detector for inverter
JP2011109739A (en) Power conversion apparatus
WO2018078837A1 (en) Electric motor driving device
JPWO2012114467A1 (en) Power converter
CN107960144B (en) Inverter device
JP2006191743A (en) Three-level pwm power converter
US20220065933A1 (en) Power switch fault detection method and power switch fault detection circuit
JP5169060B2 (en) Power failure detection device for power regeneration inverter device
JP2015035894A (en) Power conversion device and method for controlling power conversion device
Klumpner et al. Short term ride through capabilities for direct frequency converters
CN112236931B (en) Phase failure detection device for power conversion device
JP4091456B2 (en) Uninterruptible power system
US7973510B2 (en) Apparatus for controlling inverter
JP2003164162A (en) Open-phase detection method for inverter circuit and power converter
JP2008118829A (en) Protective device of inverter device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100603

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120514

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120522

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120627

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20120627

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20121204

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20121217

R150 Certificate of patent or registration of utility model

Ref document number: 5169060

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150