JPS61173667A - Power converter - Google Patents
Power converterInfo
- Publication number
- JPS61173667A JPS61173667A JP1091785A JP1091785A JPS61173667A JP S61173667 A JPS61173667 A JP S61173667A JP 1091785 A JP1091785 A JP 1091785A JP 1091785 A JP1091785 A JP 1091785A JP S61173667 A JPS61173667 A JP S61173667A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- overvoltage
- current
- generated
- capacitor
- 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
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は電力変換装置に係シ、特に、電源側の高調波電
流を低減するのに好適な電力変換装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a power conversion device, and particularly to a power conversion device suitable for reducing harmonic current on a power source side.
全波サイリスタブリッジを用いて、位相制御を行ない、
交流−直流変換を行なう電力変換装置はカ行から回生ま
で連続的に制御でき電動機等の制御装置として好適であ
る。Phase control is performed using a full-wave thyristor bridge,
A power conversion device that performs AC-DC conversion can continuously control everything from power generation to regeneration, and is suitable as a control device for electric motors and the like.
しかし、この方式ではサイリスタの位相制御を行なうた
め、電源側の電流は電源電圧に対して位相の異なる電流
とな）力率が悪くなる。However, in this method, the phase of the thyristor is controlled, so the current on the power supply side has a phase different from that of the power supply voltage, resulting in a poor power factor.
この問題を解決するため、特開昭５６−１６２９７６号
公報で一つの方式が提案されている。この方式は、全波
サイリスタブリッジの正側三個のサイリスタを電流遮断
機能をもつ開閉素子（トランジスタ又はゲートターンオ
フサイリスタ等を含めたもので以下ＧＴＯと称する）を
用いて直流出力をチョッピングし、このチョッピングす
るパルス幅を制御して出力電圧を制御すること及び出力
電圧が所定値以下のときは位相制御を並用する方式で、
電源電圧と電流の基本波を同相となるようにして基本波
力率を１となる範囲を大きくなるよう制御し、力率の改
善を図ったものである。In order to solve this problem, a method is proposed in Japanese Patent Laid-Open No. 162976/1983. This method chops the DC output of three thyristors on the positive side of a full-wave thyristor bridge using switching elements (including transistors, gate turn-off thyristors, etc., hereinafter referred to as GTO) that have a current cutoff function. This method controls the output voltage by controlling the chopping pulse width, and also uses phase control when the output voltage is below a predetermined value.
The power factor is improved by making the fundamental wave of the power supply voltage and current to be in phase and controlling the range in which the fundamental wave power factor becomes 1 to be large.
流し、１πラジアンの期間遮断を繰シ返し、しかも、通
流期間中は複数個の等パルス幅の電流が流れることにな
る。The current is repeatedly turned on and cut off for a period of 1π radian, and moreover, a plurality of currents with equal pulse widths flow during the conduction period.
また、ＧＴＯが電源電流をチョッピングするため電源の
インダクタンス分によってＧＴＯに過電圧が発生する。Furthermore, since the GTO chops the power supply current, an overvoltage is generated in the GTO due to the inductance of the power supply.
この過電圧を抑制するため、特開昭５８−８３５８８号
公報で一つの方式が提案されている。In order to suppress this overvoltage, a method is proposed in Japanese Patent Laid-Open No. 58-83588.
しかし、過電圧を抑制するため電源側にコンデンサを用
いる方式を採用すると、電源トランスの電磁音が大きく
なる等の問題がめった。However, when a system using a capacitor on the power supply side was adopted to suppress overvoltage, problems such as increased electromagnetic noise from the power transformer occurred.
本発明の目的は、電源トランス等の電磁音が低減できる
電力変換装置を提供することにある。An object of the present invention is to provide a power conversion device that can reduce electromagnetic noise from a power transformer or the like.
電力変換装置が発生する高調波成分が過電圧吸収用コン
デンサと電源のインダクタンスとの共振現象によシ、電
源電流が増大することを解明し、これを防止するための
補償回路を付加する。We found that the power supply current increases due to the resonance phenomenon between the overvoltage absorbing capacitor and the power supply inductance due to the harmonic components generated by the power converter, and we added a compensation circuit to prevent this.
さらに、電源電流の高調波成分をよシ低減するために、
電力変換装置が発生する各欠周波数の高調波を吸収する
各種補償回路を付加する。Furthermore, in order to reduce the harmonic components of the power supply current,
Various compensation circuits are added to absorb harmonics of each missing frequency generated by the power converter.
本発明の一実施例を第１図に示す。図において、Ｅ、は
交流電源、Ｕ！〜Ｗｚはサイリスタ、ＵＧＴＯ−ＷＧＴ
ＯはＧＴＯ，ＲＬＸＬＬは負荷回路の抵抗及びインダク
タンス、ＥＬは負荷に起電力がある場合の電源、Ｌ ｔ
ｒ −Ｌｗ Ｆｉ電源各相のインダクタンス、Ｃυ〜Ｃ
ｗは過電圧吸収回路のコンデンサ、Ｃ２は補償回路であ
る。An embodiment of the present invention is shown in FIG. In the figure, E is an AC power supply, and U! ~Wz is thyristor, UGTO-WGT
O is GTO, RLXLL is the resistance and inductance of the load circuit, EL is the power supply when the load has an electromotive force, L t
r -Lw Inductance of each phase of Fi power supply, Cυ~C
w is a capacitor of an overvoltage absorption circuit, and C2 is a compensation circuit.
とのＧＴＯとサイリスタよ多構成される変換装置は、た
とえば、サイリスタＶ！が導通状態のとき、ＵＧＴＯが
オンすると、電源Ｕ−Ｖ間電圧電圧荷回路に供給する通
流期間であシ、ＵＧＴＯがオフしＶＧＴＯがオンすると
、負荷電流はサイリスタｖ２とＶＧＴＯを流れる還流期
間とからなる。A conversion device composed of multiple GTOs and thyristors is, for example, a thyristor V! When UGTO is in a conductive state, when UGTO is turned on, there is a conduction period in which the voltage between the power supplies U and V is supplied to the load circuit, and when UGTO is turned off and VGTO is turned on, the load current flows through thyristor v2 and VGTO during a freewheeling period. It consists of.
このような動作を各サイリスタとＧＴＯで繰返えして制
御する。These operations are controlled by repeating each thyristor and GTO.
一方、ＧＴＯが電源電流を遮断すると電源側のインダク
タンスＬ ａ −Ｌ ｗによって過電圧が発生するから
これを抑制するため過電圧吸収回路Ｃｙ〜Ｃｗを接続し
、Ｌ ＋ｙ−Ｌｗで発生する電圧を吸収するもので、こ
れまではＣ口〜Ｃｗの電圧がＧＴＯの許容耐圧以下とな
るように選定していた。On the other hand, when the GTO cuts off the power supply current, overvoltage is generated due to the inductance La - Lw on the power supply side, so in order to suppress this, overvoltage absorption circuits Cy to Cw are connected to absorb the voltage generated at L + y - Lw. Until now, the voltage between C port and Cw was selected to be below the GTO's allowable withstand voltage.
ところで、本方式の変換装置は通流期間と還流期間の一
周期をヱπラジアン中に数回繰返して行なうもので、説
明は８回繰返えす場合について述ぺる。この場合、チョ
ッピング周波数は１２００Ｈｚとなシ、パルス幅はすべ
て等パルス幅となる。By the way, the conversion device of this system repeats one period of the flow period and the reflux period several times in Φ radians, and the explanation will be given for the case where it is repeated eight times. In this case, the chopping frequency is 1200 Hz, and all pulse widths are equal.
通流期間と還流期間が同一のときで、負荷電流が２００
Ａであるときの変換装置自体が発生する高調波成分は第
２図のようにな〕、周波数が高くなるに従い、高調波成
分は減少傾向になるが、チョッピング周波数ｆｃ近辺で
、その影響が大きくなる。When the conduction period and the reflux period are the same, and the load current is 200
The harmonic components generated by the converter itself when Become.
さて、第２図で示す高調波成分は電流源となってＣａ＝
ＣｗとＬｔｒ〜Ｌｗとからなる電源側に供給されると考
えると、変換装置が発生する高調波電流Ｉｃｖｓ と
電源電流の高調波電流工σ、との比は第３図で示すよう
になる。第３図でＧＯは補償回路Ｃ９かない場合の特性
であシ、周波数ｆｏのとき電源側には大きな高調波電流
が流れる。Now, the harmonic component shown in Figure 2 becomes a current source and Ca=
Considering that it is supplied to the power supply side consisting of Cw and Ltr to Lw, the ratio between the harmonic current Icvs generated by the converter and the harmonic current factor σ of the power supply current is as shown in FIG. In FIG. 3, GO is the characteristic when there is no compensation circuit C9, and when the frequency is fo, a large harmonic current flows on the power supply side.
周波数で、ＣｔＦの容量ｔＧＴｏのチョッピング時に発
生する過電圧吸収のみに着目して選定すると第２図で示
す変換装置が発生する大きな高調波成分に一致する場合
があシ、このとき電源側には非常に大きな高調波電流が
流れる。このため、電源トランス等に電磁音が発生する
。If the frequency is selected by focusing only on the overvoltage absorption that occurs during chopping of the CtF capacitance tGTo, it may match the large harmonic component generated by the converter shown in Figure 2, and in this case, there is an extremely A large harmonic current flows through the Therefore, electromagnetic noise is generated in the power transformer and the like.
この共振現象によって発生する電源側の高調波電流を抑
制するために、第１図で示した補償回路Ｃ２を用いる。In order to suppress the harmonic current on the power supply side generated by this resonance phenomenon, the compensation circuit C2 shown in FIG. 1 is used.
補償回路のコンデンサＣとインダクタンスＬの関係を電
源のインダクタンスＬｔｒと過電圧吸収用コンデンサＣ
ｏとの共振周波数ｆ。The relationship between the compensation circuit capacitor C and inductance L is expressed as the power supply inductance Ltr and the overvoltage absorption capacitor C.
Resonant frequency f with o.
に合せるように選定し、かつ、抵抗几を最適に調整する
と周波数ｆｏの高調波電流が吸収できるので電源側の高
調波電流Ｉｏｎと変換装置が発生する高調波電流Ｉ ｃ
ｖｍ の比はに３図のＧｌ（７）特性となシ、大幅に改
善できる。なお、補償回路のＣ−Ｌ−Ｒは各線間に接続
するものとする。If the resistor is selected and the resistor is adjusted optimally, the harmonic current of the frequency fo can be absorbed, so the harmonic current Ion on the power supply side and the harmonic current I c generated by the converter can be absorbed.
The ratio of vm can be significantly improved compared to the Gl(7) characteristic shown in Figure 3. It is assumed that C-L-R of the compensation circuit is connected between each line.
この結果、電源側のインダクタンスＬｕ〜Ｌｗと過電圧
吸収用コンデンサＣａ＝Ｃｗとの共振現象によって電源
電流に発生する大きな高調波電流を抑制できる効果があ
る。As a result, a large harmonic current generated in the power supply current due to the resonance phenomenon between the inductances Lu to Lw on the power supply side and the overvoltage absorbing capacitor Ca=Cw can be suppressed.
他の実施例を第４図に示す。この方式は補償回路Ｃ２に
複数個のＣ−Ｌ−Ｒを用いたものである。Another embodiment is shown in FIG. This method uses a plurality of CLRs in the compensation circuit C2.
電源側のインダクタンスＬ ｕ ＝ Ｌ ｖと電圧吸収
用コンデンサＣｔｒ〜Ｃｗによる共振現象で発生する電
源側高調波電流の増大を抑制しても変換装置は第２図で
示す高調波成分を発生するから電流波形は第５図に示し
たものとｆｘシ、若干悪い。又、このときの電源電流に
含まれる高調波電流の成分は第６図のＩの特性となる。Even if the increase in the harmonic current on the power supply side caused by the resonance phenomenon caused by the inductance L u = L v on the power supply side and the voltage absorption capacitors Ctr to Cw is suppressed, the converter still generates the harmonic components shown in Fig. 2. The current waveform is slightly worse than that shown in FIG. Further, the harmonic current component included in the power supply current at this time has the characteristic I in FIG. 6.
この高調波電流成分を低減して、電流波形を改善するた
めには変換装置が発生する高調波電流を吸収し、電源側
に影響を与えないように構成することである。変換装置
が発生する高調波は主に電源周波数の（６ｍ±１）（ｍ
は整数）次であるから、これらすべてについて吸収回路
を付加すれば良い。In order to reduce this harmonic current component and improve the current waveform, it is necessary to absorb the harmonic current generated by the converter and configure it so that it does not affect the power supply side. The harmonics generated by the converter are mainly (6m±1)(m) of the power supply frequency.
is an integer), so it is sufficient to add absorption circuits for all of them.
第４図では、−例として、電源周波数の第５゜７．１１
，１３．２５次の周波数の高調波成分を吸収するＣ−Ｌ
−３回路を各線間に接続した場合について示した。この
ように構成した場合の電流波形は第７図に、電源電流に
含まれる高調波成分は第６図の■の特性で示すものとな
シ、良好なものとなる。In Figure 4, - for example, the 5°7.11
, 13. C-L that absorbs the harmonic components of the 25th order frequency.
- The case where three circuits are connected between each line is shown. The current waveform in the case of such a configuration is shown in FIG. 7, and the harmonic components contained in the power supply current are as shown by the characteristic (■) in FIG. 6, which is good.
しかし、本発明はこれに限定するものではなく、電源側
に補償回路として吸収回路を用いて波形改善を行ないそ
の使用条件を満足するものであればよい。However, the present invention is not limited to this, and it is sufficient to use an absorption circuit as a compensation circuit on the power supply side to improve the waveform and satisfy the usage conditions.
また、三相全波サイリスタブリッジの三個のみをＧＴＯ
に置変えた回路についてのみ説明したがＧＴＯｔ六個使
用した場合にも同様の効果が得られる。In addition, only three of the three-phase full-wave thyristor bridges are GTO
Although only the circuit in which the circuit is replaced with the one shown in FIG.
〔発明の効果〕
本発明によれば、ＧＴＯのチョッピング時に発生する過
電圧を吸収するためのコンデンサと電源のインダクタン
ス忙よる共振現象で発生する電源側の高調波電流の増大
を抑制でき、又、複数個の吸収回路の付加によシ、電源
電流の波形改善が図れるので高調波電流の低減ができ、
並設装置への過電流の抑制や電磁音の低減が図れる。[Effects of the Invention] According to the present invention, it is possible to suppress the increase in harmonic current on the power supply side that occurs due to the resonance phenomenon caused by the inductance of the power supply and the capacitor for absorbing the overvoltage that occurs during chopping of the GTO. By adding an absorption circuit, it is possible to improve the waveform of the power supply current, thereby reducing harmonic current.
It is possible to suppress overcurrent to parallel equipment and reduce electromagnetic noise.
第１図は本発明の一実施例の回路図、第２図。
第３図は本発明の特性図、第４図は本発明の他の実施例
の回路図、第５図、第６図、第７図は発明を説明するた
めの特性図である。
ＣＵ〜Ｃｗ・・・過電圧吸収用コンデンサ、Ｃ，・ニー
・補償回路、Ｌ、ｖ〜Ｌｗ・・・電源側のインダクタン
ス、ＵＧＴＯ〜ＷＧＴＯ・・・ＧＴＯｌＵｓ 〜Ｗ鵞・
・・サイリスク。
代理人 弁理士、、、ｉｔ橋明矩
第１０
ＣＰ Ｃｆ
茅乙口
ｆFIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention. FIG. 3 is a characteristic diagram of the present invention, FIG. 4 is a circuit diagram of another embodiment of the present invention, and FIGS. 5, 6, and 7 are characteristic diagrams for explaining the invention. CU~Cw...Capacitor for overvoltage absorption, C,・Knee・Compensation circuit, L, v~Lw...Inductance on the power supply side, UGTO~WGTO...GTOlUs~W鵞・
...Sirisk. Agent: Patent Attorney, IT Hashi Akinori No. 10 CP Cf Kayoguchi F
Claims (1)
換装置で前記開閉素子が動作時に発生する過電圧を吸収
する過電圧吸収回路を前記交流−直流変換装置の電源側
に接続したものにおいて、前記交流−直流変換装置の動
作によつて発生する高調波電流を吸収する回路を前記過
電圧吸収回路と並列に設けたことを特徴とする電力変換
装置。 ２、特許請求の範囲第１項において、前記過電圧吸収回
路はコンデンサからなり、又前記高調波電流の吸収回路
はコンデンサ、インダクタンスおよび抵抗器で構成した
ことを特徴とする電力変換装置。 ３、特許請求の範囲第１項において、前記高調波電流吸
収回路は周波数の異なる複数個の回路で構成されること
を特徴とする電力変換装置。 ４、特許請求の範囲第２項において過電圧吸収用コンデ
ンサと電源側のインダクタンスとによる共振周波数は電
源周波数の（６ｍ±１）倍の値を避けるように選定した
ことを特徴とする電力変換装置。[Claims] 1. In an AC-DC converter using a switching element having a current interrupting function, an overvoltage absorption circuit for absorbing an overvoltage generated when the switching element operates is provided on the power supply side of the AC-DC converter. 1. A power conversion device, wherein a circuit for absorbing harmonic current generated by the operation of the AC-DC converter is provided in parallel with the overvoltage absorption circuit. 2. The power conversion device according to claim 1, wherein the overvoltage absorption circuit is composed of a capacitor, and the harmonic current absorption circuit is composed of a capacitor, an inductance, and a resistor. 3. The power conversion device according to claim 1, wherein the harmonic current absorption circuit is composed of a plurality of circuits having different frequencies. 4. A power conversion device according to claim 2, characterized in that the resonance frequency of the overvoltage absorbing capacitor and the inductance on the power supply side is selected to avoid a value that is (6m±1) times the power supply frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091785A JPS61173667A (en) | 1985-01-25 | 1985-01-25 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091785A JPS61173667A (en) | 1985-01-25 | 1985-01-25 | Power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61173667A true JPS61173667A (en) | 1986-08-05 |
Family
ID=11763604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1091785A Pending JPS61173667A (en) | 1985-01-25 | 1985-01-25 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61173667A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967334A (en) * | 1989-09-12 | 1990-10-30 | Sundstrand Corporation | Inverter input/output filter system |
-
1985
- 1985-01-25 JP JP1091785A patent/JPS61173667A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967334A (en) * | 1989-09-12 | 1990-10-30 | Sundstrand Corporation | Inverter input/output filter system |
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