JPS6039375A - Output waveform improving method of inverter - Google Patents
Output waveform improving method of inverterInfo
- Publication number
- JPS6039375A JPS6039375A JP58147824A JP14782483A JPS6039375A JP S6039375 A JPS6039375 A JP S6039375A JP 58147824 A JP58147824 A JP 58147824A JP 14782483 A JP14782483 A JP 14782483A JP S6039375 A JPS6039375 A JP S6039375A
- Authority
- JP
- Japan
- Prior art keywords
- inverter
- output
- current
- harmonic
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
この発明はインバータの出力に非線形負荷が接続された
場合等におけるインバータの出力波形改善方法に関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving the output waveform of an inverter when a nonlinear load is connected to the output of the inverter.
第１図は従来例を示すもので、１はインバータで、この
インバータ１の出力はりアクドル２とコンデンサ３とを
介し、整流器からなる非線形負荷４に接続される。この
負荷４の入力端にはインダクタンス５とコンデンサ６の
直列回路からなるＬＯフィルタ７が接続される。このＬ
Ｏフィルタ７はインバータ１の出力を非線形負荷４に供
給させたときに発生ずる高調波電流のために、インバー
タ１の出力電圧波形が歪のを防止するためのものである
。なお８はコンデンサである。FIG. 1 shows a conventional example. Reference numeral 1 denotes an inverter, and the output of the inverter 1 is connected via an axle 2 and a capacitor 3 to a nonlinear load 4 consisting of a rectifier. An LO filter 7 consisting of a series circuit of an inductance 5 and a capacitor 6 is connected to the input end of the load 4. This L
The O filter 7 is used to prevent the output voltage waveform of the inverter 1 from being distorted due to harmonic current generated when the output of the inverter 1 is supplied to the nonlinear load 4. Note that 8 is a capacitor.
上記のように非線形負荷４の入力側にＬＣフィルタ７を
設けると、ＬＯフィルタ７はインバータ１から見たとき
に進み回路になる。このため、進み電流が流れてインバ
ータ電流が増大する欠点を持っている。そこで、インバ
ータ１の負荷力率を調整して進み電流を抑制するために
、ＬＯフィルタ７と並列にインダクタンスＬ（図示省略
）全接続すればその調整が可能であるけれども、ＬＯフ
ィルタ７の容量が更に増大する欠点を伴う。従って、非
線形負荷４の入力側にＬＯフィルタ７を設け、高調波電
流を抑制することは好１しくない。When the LC filter 7 is provided on the input side of the nonlinear load 4 as described above, the LO filter 7 becomes a lead circuit when viewed from the inverter 1. This has the disadvantage that a leading current flows and the inverter current increases. Therefore, in order to adjust the load power factor of the inverter 1 and suppress the lead current, the adjustment can be made by connecting the entire inductance L (not shown) in parallel with the LO filter 7, but the capacity of the LO filter 7 is with further increasing drawbacks. Therefore, it is not preferable to provide the LO filter 7 on the input side of the nonlinear load 4 to suppress harmonic current.
この発明は上記の小情に鑑みてなされたもので、ＬＣフ
ィルタを使用しないでも非線形負荷によって発生する高
調波電流によるインバータの出力′電圧波形歪の改善を
図ることができるインバータの出力波形改善方法を提供
することを目的とする。This invention was made in view of the above considerations, and is an inverter output waveform improvement method that can improve the inverter output voltage waveform distortion caused by harmonic current generated by a nonlinear load without using an LC filter. The purpose is to provide
以下図面を参照してこの発明の一実施例を説明するに第
１図と同一部分は同一符号を付して示す。An embodiment of the present invention will be described below with reference to the drawings, in which the same parts as in FIG. 1 are denoted by the same reference numerals.
第２図において、インバータ１の出力はりアクドル２と
コンデンサ３を介して整流器からなる非線形負荷４に供
給される。９は変流器で、この変流器９はインバータ１
の出方端と負荷４との電路に配設される。前記変流器９
はインバータ１の出力′電流を検出し、検出された電流
は各次数別の高調波フィルタ１０に供給される。この高
調波フィルタ１０は出力に各次数別の高調渡分を送出す
るもので、送出された各高調渡分はインバータの出力イ
ンピーダンス乗算部１１に人力され、ここで各高調渡分
と出力インピーダンス値とが乗算されて合成される。な
お、上述のように高調波フィルタ１ｏで谷次数別の、ｌ
７ｉＡ波分を得るのはインバータの出方インピーダンス
が周波数によって異なるからである。前記出力インピー
ダンス乗算部１１で乗算されて合成された出力（高調波
電流と出力インピーダンスの積との電圧）はインバータ
１の出力電圧に重畳され、この電圧によって電圧の高調
渡分が補償される。In FIG. 2, the output of the inverter 1 is supplied via an accelerator 2 and a capacitor 3 to a nonlinear load 4 consisting of a rectifier. 9 is a current transformer, and this current transformer 9 is connected to the inverter 1.
It is arranged in the electric path between the output end of the load 4 and the load 4. Said current transformer 9
detects the output current of the inverter 1, and the detected current is supplied to harmonic filters 10 for each order. This harmonic filter 10 outputs a harmonic component for each order, and each transmitted harmonic component is inputted to the output impedance multiplication section 11 of the inverter, where each harmonic component and the output impedance value are input. are multiplied and combined. In addition, as mentioned above, in the harmonic filter 1o, for each valley order, l
The reason why 7iA wave components are obtained is that the output impedance of the inverter differs depending on the frequency. The output (voltage of the product of harmonic current and output impedance) multiplied and synthesized by the output impedance multiplier 11 is superimposed on the output voltage of the inverter 1, and the harmonic component of the voltage is compensated by this voltage.
次に第２図の回路を単−高調渡分に着目して等価回路を
考えると第３図のように表わされる。第３図において、
等測高調波電流源２０の′電施工Ｈによって高調波電圧
光が発生する。この′電圧■。は次式％式％
捷だ、゛電施工θは次式で表わされる。Next, if we consider the equivalent circuit of the circuit of FIG. 2 focusing on the mono-harmonic transition, it is expressed as shown in FIG. 3. In Figure 3,
Harmonic voltage light is generated by the electrical operation H of the isometric harmonic current source 20. This 'voltage■. is expressed by the following formula, % formula.
ここで、■θ＝ｚＢＩ日 とすると
工。ニー卸、ｖｓ＝−ｚθ工Ｈとなる０、”、Ｖ０＝Ｏ
となる。Here, if ■θ=zBI days, then . Knee wholesale, vs=-zθ engineering H becomes 0,'', V0=O
becomes.
即ち上記Ｖｏ ＝Ｑは高調波電流と出力インピーダンス
を乗算して得られた電圧をインバータに重畳することに
より電圧の高調渡分を補償できることを意味している。That is, the above Vo =Q means that the harmonic component of the voltage can be compensated by superimposing the voltage obtained by multiplying the harmonic current and the output impedance on the inverter.
なお、上記説明ではインバータの出力電流を検出してそ
の補償手段を講じていたが、負荷電流を検出して補償さ
せてもよい。In the above description, the output current of the inverter is detected and the compensation means is taken, but the load current may also be detected and compensated.
以上述べたように、この発明によれば、インバータの出
力電流を各次数別の高調波フィルタを介して各次数別高
峠波分編得、これら高調渡分にインハータノ出力インヒ
ーダを乗算してこれを合成して得た電圧をインバータの
出カ′帆圧に重畳させるものであるから、従来方法のよ
うに大容量のＬＯフィルタを必要としないでも、非線形
負荷によるインバータの出方電圧波形歪を確実に改善す
ることができ、また、進み電流の増大も生じない等の優
れた効果を奏することができる。As described above, according to the present invention, the output current of the inverter is divided into high frequency waves for each order through the harmonic filters for each order, and these harmonic components are multiplied by the inverter output impeder. Since this method superimposes the voltage obtained by synthesizing the voltage on the inverter's output sail pressure, it does not require a large-capacity LO filter like the conventional method, but it can eliminate the distortion of the inverter's output voltage waveform due to nonlinear loads. This can be reliably improved, and excellent effects such as no increase in lead current can be achieved.
第１図は従来の電圧制御インバータの出力波形改善方法
の概略構成図、第２図はこの発明の一実施例の概略構成
図、第３図は第２図の回路における単−高調渡分だけに
着目した等価回路図である。
１・・・インバータ、２・・・リアクトル、３ ・コン
デンサ、４・・・非線形負荷、５−・・インダクタンス
、１０・・・高調波フィルタ、１１・・・出力インピー
ダンスの乗算部、２０・・・高調波電流源、３０・・高
調波電圧源。Fig. 1 is a schematic block diagram of a conventional method for improving the output waveform of a voltage controlled inverter, Fig. 2 is a schematic block diagram of an embodiment of the present invention, and Fig. 3 shows only the single-harmonic transition in the circuit of Fig. 2. It is an equivalent circuit diagram focusing on. DESCRIPTION OF SYMBOLS 1... Inverter, 2... Reactor, 3 - Capacitor, 4... Nonlinear load, 5-... Inductance, 10... Harmonic filter, 11... Output impedance multiplier, 20...・Harmonic current source, 30...Harmonic voltage source.
Claims (1)
て、前記インバータの出力′ｉ、ｉＮ流を検出した後、
この電流を高調波フィルタに与えて、各次数刈高調波電
流を取り出し、取り出された高ｒｊ４波電流にインバー
タの出力インピーダンスを乗算し、これら各乗算値を合
成して、この合成値にインバータの出力電圧をＡＭさせ
ることを特徴とするインバータの出力波形改善方法。In the method of supplying the output of an inverter to a nonlinear load, after detecting the output 'i, iN current of the inverter,
This current is applied to a harmonic filter to extract each order cut harmonic current, the extracted high rj 4 wave current is multiplied by the output impedance of the inverter, these multiplication values are combined, and the combined value is applied to the inverter. A method for improving an output waveform of an inverter, characterized by amending the output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58147824A JPH0636671B2 (en) | 1983-08-12 | 1983-08-12 | Inverter output waveform improvement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58147824A JPH0636671B2 (en) | 1983-08-12 | 1983-08-12 | Inverter output waveform improvement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6039375A true JPS6039375A (en) | 1985-03-01 |
| JPH0636671B2 JPH0636671B2 (en) | 1994-05-11 |
Family
ID=15439058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58147824A Expired - Lifetime JPH0636671B2 (en) | 1983-08-12 | 1983-08-12 | Inverter output waveform improvement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636671B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63227998A (en) * | 1987-03-13 | 1988-09-22 | Matsushita Electric Ind Co Ltd | Motor-driven blower |
| US5327335A (en) * | 1992-09-28 | 1994-07-05 | Sundstrand Corporation | Harmonic feedback control for an inverter |
| US6144269A (en) * | 1997-06-10 | 2000-11-07 | Fuji Electric Co., Ltd. | Noise-cut LC filter for power converter with overlapping aligned coil patterns |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58100486U (en) * | 1981-12-25 | 1983-07-08 | 株式会社明電舎 | Asynchronous PWM inverter |
-
1983
- 1983-08-12 JP JP58147824A patent/JPH0636671B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58100486U (en) * | 1981-12-25 | 1983-07-08 | 株式会社明電舎 | Asynchronous PWM inverter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63227998A (en) * | 1987-03-13 | 1988-09-22 | Matsushita Electric Ind Co Ltd | Motor-driven blower |
| US5327335A (en) * | 1992-09-28 | 1994-07-05 | Sundstrand Corporation | Harmonic feedback control for an inverter |
| US6144269A (en) * | 1997-06-10 | 2000-11-07 | Fuji Electric Co., Ltd. | Noise-cut LC filter for power converter with overlapping aligned coil patterns |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0636671B2 (en) | 1994-05-11 |
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