JPH02202368A - Control method for pwm inverter - Google Patents
Control method for pwm inverterInfo
- Publication number
- JPH02202368A JPH02202368A JP1017538A JP1753889A JPH02202368A JP H02202368 A JPH02202368 A JP H02202368A JP 1017538 A JP1017538 A JP 1017538A JP 1753889 A JP1753889 A JP 1753889A JP H02202368 A JPH02202368 A JP H02202368A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- pwm control
- synchronous
- asynchronous
- 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
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
- H02P27/08—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 with pulse width modulation
- H02P27/085—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 with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (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ＰＷＭインバータを同期式と非同期式とに切替
えて制御するＰＷＭインバータの制御方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of controlling a PWM inverter by switching the PWM inverter between a synchronous type and an asynchronous type.
（従来の技術）
ＰＷＭインバータの制御方法には、変調周波数と運転周
波数との関係において、変調周波数をインバータの運転
周波数に比例して変化させる同期式と、変調周波数を固
定する非同期式とがある。(Prior art) Regarding the relationship between the modulation frequency and the operating frequency, PWM inverter control methods include a synchronous method in which the modulation frequency is changed in proportion to the inverter's operating frequency, and an asynchronous method in which the modulation frequency is fixed. .
同期式ＰＷＭ制御では運転周波数と変調周波数とによる
ビートの問題は生じないが、運転周波数を下げるとこれ
に比例して変調周波数も下るので、電流リップルおよび
トルクリップルが大きくなるという問題がある。In synchronous PWM control, the problem of beats due to the operating frequency and modulation frequency does not occur, but when the operating frequency is lowered, the modulation frequency also decreases in proportion to this, so there is a problem that current ripple and torque ripple become larger.
さらに変調周波数には限度があるので、運転周波数と変
調周波数との比を切替えて変調周波数をある範囲内に納
める必要があるが、この変調周波数切替時にショックや
電圧の不連続を発生するという問題があり、周波数が変
化することによる耳ざわりな騒音の問題もある。Furthermore, since there is a limit to the modulation frequency, it is necessary to keep the modulation frequency within a certain range by switching the ratio between the operating frequency and the modulation frequency, but there is a problem that shocks and voltage discontinuities occur when switching the modulation frequency. There is also the problem of harsh noise due to frequency changes.
一方、非同期式ＰＷＭ制御では、変調周波数が一定であ
るため騒音対策が容易であると共に変調周波数を選ぶ自
由度が高く、低周波域では同期式に比べてリップルが抑
えられるが、デッドタイムの影響によって中速域で不安
定現象を生じ易く。On the other hand, with asynchronous PWM control, since the modulation frequency is constant, noise countermeasures are easy and there is a high degree of freedom in selecting the modulation frequency, and ripples are suppressed in the low frequency range compared to the synchronous type, but the effect of dead time This tends to cause instability in the medium speed range.
また運転周波数と変調周波数との比が小さいとビートが
発生し易いという問題がある。Furthermore, if the ratio between the operating frequency and the modulation frequency is small, there is a problem in that beats are likely to occur.
このため、両方の制御方式の長所を生かし、運転周波数
が低い時は非同期式の制御を行い、運転周波数が高い時
は同期式の制御に切替える方法があり、この方法では低
周波域においてリップルが大きくなるのを防止できると
共に、中周波域以降においては電圧が安定するという利
点がある。Therefore, there is a method that takes advantage of the advantages of both control methods, performing asynchronous control when the operating frequency is low, and switching to synchronous control when the operating frequency is high. This method reduces ripples in the low frequency range. This has the advantage of not only preventing the voltage from increasing, but also stabilizing the voltage in the middle frequency range and beyond.
（発明が解決しようとする課題）
最近はＦＥＴやＩＧＢＴなど高速のスイッチングが可能
な素子が用いられるようになり、特に工ＧＢＴは従来の
ＧＴＲ相当の大容量のものも現れている。(Problems to be Solved by the Invention) Recently, elements capable of high-speed switching such as FETs and IGBTs have been used, and in particular, GBTs with large capacities equivalent to conventional GTRs have appeared.
しかしながら運転周波数に比例して変調周波数が変化す
る同期式においては、高速のスイッチング素子にも限界
があるのでパルス数を切替えなくてはならず、この時に
ショックや電圧の不連続を生ずるという問題が残る。However, in the synchronous type, where the modulation frequency changes in proportion to the operating frequency, even high-speed switching elements have their limits, so the number of pulses must be changed, which causes problems such as shocks and voltage discontinuities. remain.
本発明は高速のスイッチング素子を用いたＰＷＭインバ
ータに同期式と非同期式をさらに効果的に適用すること
によってＰＷＭインバータを広い運転周波数範囲におい
て安定に制御できる合理的なＰＷＭインバータの制御方
法を提供することを目的としている。The present invention provides a rational PWM inverter control method that can stably control a PWM inverter over a wide operating frequency range by more effectively applying a synchronous type and an asynchronous type to a PWM inverter using high-speed switching elements. The purpose is to
（課題を解決するための手段と作用）
本発明は上記の目的を達成するために、スイッチング周
波数の高い素子を用いると共に、同期式ＰＷＭ制御手段
、非同期式ＰＷＭ制御手段、およびこれらの切替制御手
段を用いて運転周波数に応じて同期式と非同期式を切替
えてＰＷＭ制御を行うものである。(Means and effects for solving the problems) In order to achieve the above object, the present invention uses an element with a high switching frequency, and also includes a synchronous PWM control means, an asynchronous PWM control means, and a switching control means for these. PWM control is performed by switching between a synchronous type and an asynchronous type depending on the operating frequency.
すなわち第２図に示すように、インバータ運転周波数ｆ
東の低域（ｆ”＜ｆＬ）においては変調周波数ｆＭ２の
非同期式ＰＷＭを（図中ａの期間）、中域（ｆＬ５ｆ”
≦ｆｌｌ）においては運転周波数ｆ京に比例した変調周
波数（ｆ ＮＬ−ｆ ＭＨ）の同期式ＰＷＭを（図中す
の期間）、さらに高域（ｆ’＞ｆＨ）においては変調周
波数ｆＭ）ｌで非同期式ＰＷＭを（図中Ｃの期間）行う
。That is, as shown in FIG. 2, the inverter operating frequency f
In the east low range (f"<fL), asynchronous PWM with modulation frequency fM2 is applied (period a in the figure), and in the middle range (fL5f").
≦fll), synchronous PWM with a modulation frequency (f NL - f MH) proportional to the operating frequency f ky (period indicated by square in the figure), and in higher frequencies (f'> fH), the modulation frequency fM) l Asynchronous PWM is performed (period C in the figure).
（実施例） 本発明の一実施例を第１図に示す。(Example) An embodiment of the present invention is shown in FIG.
第１図において、１は直流電源、２は直流フィルタコン
デンサ、３はインバータ、４は誘導電動機、５は周波数
設定器、６は非同期式から同期式に切替える時の運転周
波数ｆ′：、と、同期式から非同期式に切替える時の運
転周波数ｆ５を設定する運転切替周波数設定器、７は周
波数設定器５で設定された運転周波数ｆ京と運転切替周
波数設定器６で設定された運転切替周波数ｆＬ＋ ｆＨ
とを比較して切替スイッチ８ａ、 ８ｂと搬送波発生器
９に信号を送る切替制御回路、８ａ、 ８ｂは比較器の
出力によって一方がオンすると共に他方がオフする切替
スイッチ、１０は同期式ＰＷＭ制御回路、１１は非同期
式ＰＷＭ制御回路である。In FIG. 1, 1 is a DC power supply, 2 is a DC filter capacitor, 3 is an inverter, 4 is an induction motor, 5 is a frequency setting device, 6 is an operating frequency f' when switching from an asynchronous type to a synchronous type. An operation switching frequency setter 7 sets the operating frequency f5 when switching from the synchronous type to the asynchronous type, and 7 is the operating frequency fky set by the frequency setting device 5 and the operation switching frequency fL+ set by the operation switching frequency setter 6. fH
8a and 8b are changeover switches that turn on and the other turns off depending on the output of the comparator, and 10 is a synchronous PWM control circuit. The circuit 11 is an asynchronous PWM control circuit.
周波数設定器５で設定した運転周波数ｆ京が運転切替周
波数設定器６で設定した運転切替周波数ｆ７より低い場
合には、搬送波数発生器９から一定周波数ｆＭＬの搬送
波が出力されると共に非同期式ＰＷＭ制御回路１１側の
スイッチ８ｂがオンして非同期式ＰＷＭ制御が行われる
。When the operating frequency f ky set by the frequency setter 5 is lower than the operation switching frequency f7 set by the operation switching frequency setting device 6, a carrier wave of a constant frequency fML is output from the carrier wave number generator 9, and the asynchronous PWM The switch 8b on the control circuit 11 side is turned on and asynchronous PWM control is performed.
運転周波数ｆ京が高くなって運転切替周波数設定器６の
運転切替周波数ｆ、以上ｆ、以下になると、同期式ＰＷ
Ｍ制御回路１０側のスイッチ８ａがオンして運転周波数
ｆ京に比例した変調周波数による同期式ＰＷＭ制御が行
われる。When the operation frequency f kyō becomes high and the operation switching frequency f of the operation switching frequency setter 6 becomes more than or equal to f or less, the synchronous PW
The switch 8a on the M control circuit 10 side is turned on, and synchronous PWM control is performed using a modulation frequency proportional to the operating frequency f.
さらに運転周波数ｆ＊が高くなって運転切替周波数ｆ二
を超えると、搬送波発生器９から一定周波数ｆ訂の搬送
波が出力されると共に非同期式ＰＷＭ制御回路ｌｌ側の
スイッチ８ｂがオンして非同期式ＰＷＭ制御が行われる
。When the operating frequency f* further increases and exceeds the operation switching frequency f2, the carrier wave generator 9 outputs a carrier wave with a constant frequency f, and the switch 8b on the asynchronous PWM control circuit ll side is turned on, causing the asynchronous PWM control is performed.
以上説明したように本発明のＰＷＭインバータの制御方
法によれば、インバータ運転周波数の低域では非同期式
でＰＷＭ制御が行われるので電流リップル、トルクリッ
プルが小さく、且つ変調周波数が低いのでデッドタイム
の影響も小さくなって電圧制御の精度が向上する。As explained above, according to the PWM inverter control method of the present invention, PWM control is performed asynchronously in the low range of the inverter operating frequency, so current ripple and torque ripple are small, and the modulation frequency is low, so dead time is reduced. The influence is also reduced and the accuracy of voltage control is improved.
また中域では同期式でＰＷＭ制御が行われるので波形の
安定性が向上し、さらに高域では運転周波数と変調周波
数との比を切替えない非同期式でＰＷＭ制御が行われる
ので変調周波数切替時のショックや電圧の不連続性の問
題がなくなると共に変調周波数が高いのでビートの問題
も解決される。In addition, PWM control is performed in a synchronous manner in the midrange, improving the stability of the waveform, and in the high region, PWM control is performed in an asynchronous manner that does not change the ratio between the operating frequency and the modulation frequency, so when switching the modulation frequency. The shock and voltage discontinuity problems are eliminated, and the high modulation frequency also eliminates the beat problem.
また騒音を抑える対策も講じ易く、インバータを広い周
波数領域で安定に運転することが可能となる。It is also easier to take measures to suppress noise, and it is possible to operate the inverter stably in a wide frequency range.
第１図は本発明の一実施例を示す系統図、第２図は本発
明における同期式と非同期式の運転周波数範囲の一例を
示す図である。
１・・・直流電源、
２・・・直流フィルタコンデンサ、
３・・・インバータ、 ４・・・誘導電動機、５・
・・周波数設定器、 ６・・・運転切替周波数、７・
・・切替制御回路、 ８ａ、 ８ｂ・・・切替スイッ
チ、９・・・搬送波発生器、
１０・・・同期式ＰＷＭ制御回路、
１１・・・非同期式ＰＷＭ制御回路。FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing an example of operating frequency ranges of a synchronous type and an asynchronous type in the present invention. 1... DC power supply, 2... DC filter capacitor, 3... Inverter, 4... Induction motor, 5...
... Frequency setting device, 6... Operation switching frequency, 7.
...Switching control circuit, 8a, 8b... Selector switch, 9... Carrier wave generator, 10... Synchronous PWM control circuit, 11... Asynchronous PWM control circuit.
Claims (1)
Ｍ制御を行い、中域では変調周波数が運転周波数に比例
する同期式ＰＷＭ制御を行い、高域では変調周波数が一
定の非同期式ＰＷＭ制御を行うことを特徴とするＰＷＭ
インバータの制御方法。Asynchronous PW with constant modulation frequency at low operating frequencies
PWM control in which the modulation frequency is proportional to the operating frequency in the middle range, and asynchronous PWM control in which the modulation frequency is constant in the high range.
How to control an inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1017538A JPH02202368A (en) | 1989-01-30 | 1989-01-30 | Control method for pwm inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1017538A JPH02202368A (en) | 1989-01-30 | 1989-01-30 | Control method for pwm inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02202368A true JPH02202368A (en) | 1990-08-10 |
Family
ID=11946696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1017538A Pending JPH02202368A (en) | 1989-01-30 | 1989-01-30 | Control method for pwm inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02202368A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7923961B2 (en) | 2008-08-27 | 2011-04-12 | Toyota Jidosha Kabushiki Kaisha | Vehicle equipped with motor and inverter |
| JP2012152048A (en) * | 2011-01-20 | 2012-08-09 | Nabtesco Corp | Airborne motor driving control device, and airborne motor driving control system |
| JP2013147126A (en) * | 2012-01-19 | 2013-08-01 | Nabtesco Corp | Aircraft motor drive control apparatus |
| US8525455B2 (en) | 2008-10-17 | 2013-09-03 | Toyota Jidosha Kabushiki Kaisha | Motor actuation control device |
-
1989
- 1989-01-30 JP JP1017538A patent/JPH02202368A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7923961B2 (en) | 2008-08-27 | 2011-04-12 | Toyota Jidosha Kabushiki Kaisha | Vehicle equipped with motor and inverter |
| US8525455B2 (en) | 2008-10-17 | 2013-09-03 | Toyota Jidosha Kabushiki Kaisha | Motor actuation control device |
| JP2012152048A (en) * | 2011-01-20 | 2012-08-09 | Nabtesco Corp | Airborne motor driving control device, and airborne motor driving control system |
| EP2479629A3 (en) * | 2011-01-20 | 2017-10-11 | Nabtesco Corporation | Aircraft motor drive control apparatus and aircraft motor drive control system |
| JP2013147126A (en) * | 2012-01-19 | 2013-08-01 | Nabtesco Corp | Aircraft motor drive control apparatus |
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