JP6437683B2

JP6437683B2 - Delta-less harmonic cancellation device

Info

Publication number: JP6437683B2
Application number: JP2018066592A
Authority: JP
Inventors: 進一植野; 恭男田川
Original assignee: 株式会社トーメック
Priority date: 2018-03-30
Filing date: 2018-03-30
Publication date: 2018-12-12
Anticipated expiration: 2036-10-27
Also published as: JP2018133990A

Description

本発明は、負荷電流の高調波を低減するデルタ―レス高調波相殺装置に関するものである。 The present invention relates to a delta-less harmonic cancellation device that reduces harmonics of a load current.

三相交流電力を直流電力に変換する電力変換器として、三相ブリッジ整流器がよく用いられている。三相ブリッジ整流器は電源の１サイクルに６回の転流を行うことから、その回路は６パルス整流回路とも呼ばれている。さらに、三相ブリッジ整流器を複数台組み合わせることにより、１２パルス整流回路を構成することができる。この１２パルス整流回路は、２次３次の位相差が３０度であるため１次電源に流れる高調波電流を低減できるとともに、大容量化が可能である。 A three-phase bridge rectifier is often used as a power converter that converts three-phase AC power into DC power. Since the three-phase bridge rectifier performs six commutations in one cycle of the power supply, the circuit is also called a six-pulse rectifier circuit. Furthermore, a 12-pulse rectifier circuit can be configured by combining a plurality of three-phase bridge rectifiers. Since this 12-pulse rectifier circuit has a secondary and tertiary phase difference of 30 degrees, it is possible to reduce the harmonic current flowing in the primary power supply and to increase the capacity.

図５は、ダイオードまたはサイリスタにより構成された２台の三相ブリッジ整流器からなる１２パルス整流回路の構成例である。これらの図において、１０４，１０５はそれぞれ三相ブリッジ整流器である。１００は一次巻線１０１がデルタ結線、第１の二次巻線１０２がスター結線、第２の二次巻線１０３がデルタ結線され、両二次巻線１０２，１０３の出力電圧が３０度の位相差を持つ三巻線変圧器である。ここで、図５は従来の１２パルス整流回路を示す図である。 FIG. 5 is a configuration example of a 12-pulse rectifier circuit including two three-phase bridge rectifiers configured by diodes or thyristors. In these figures, 104 and 105 are three-phase bridge rectifiers. 100, the primary winding 101 is delta-connected, the first secondary winding 102 is star-connected, the second secondary winding 103 is delta-connected, and the output voltage of both the secondary windings 102 and 103 is 30 degrees. Three-winding transformer with phase difference. Here, FIG. 5 is a diagram showing a conventional 12-pulse rectifier circuit.

図５の回路は、二台の三相ブリッジ整流器１０４，１０５の両端に負荷（図示せず）が接続され、主に高圧大容量用途に適している。図５の回路でも、第５次及び第７次の高調波が理想的には相殺されるので、１次電源の高調波を低減できる。すなわち、図５の回路のように、二台の三相ブリッジ整流器１０４，１０５の両端に同容量の負荷を接続させることにより、第５次及び第７次の高調波を相殺させて、１次電源の高調波を低減することができる。ここで、第５次及び第７次の高調波を相殺させて１次電源の高調波を低減できるようにするには、２個の負荷は同容量の負荷であることは必須である。 The circuit shown in FIG. 5 is mainly suitable for high-voltage and large-capacity applications because loads (not shown) are connected to both ends of two three-phase bridge rectifiers 104 and 105. In the circuit of FIG. 5 as well, the fifth and seventh harmonics are ideally canceled out, so that the harmonics of the primary power supply can be reduced. That is, as shown in the circuit of FIG. 5, by connecting loads of the same capacity to both ends of the two three-phase bridge rectifiers 104 and 105, the fifth and seventh harmonics are canceled and the first order The harmonics of the power supply can be reduced. Here, in order to cancel the fifth and seventh harmonics and reduce the harmonics of the primary power supply, it is essential that the two loads have the same capacity.

特開２００８−１７８１８０号公報（背景技術）JP 2008-178180 A (Background Art)

しかしなから、従来の１２パルス整流回路では、三巻線変圧器を用いているため電力変換器自体が高額な装置になるという問題もあった。また、二台の三相ブリッジ整流器１０４，１０５の両端に同容量の負荷を接続させることにより、第５次及び第７次の高調波を相殺させ１次電源の高調波を低減するものであるので、一方の三相ブリッジ整流器、負荷などが故障により作動しなくなった場合には１次電源の高調波を低減させることができなくなるという問題もあった。また、従来の１２パルス整流回路は、一方の負荷（１台運転（単独運転））のみ作動させる場合も同様、１次電源の高調波を低減させることができなくなるものであった。 However, the conventional 12-pulse rectifier circuit has a problem that the power converter itself becomes an expensive device because it uses a three-winding transformer. Further, by connecting loads of the same capacity to both ends of the two three-phase bridge rectifiers 104 and 105, the fifth and seventh harmonics are canceled out and the harmonics of the primary power supply are reduced. As a result, when one of the three-phase bridge rectifiers, the load, or the like does not operate due to a failure, the harmonics of the primary power supply cannot be reduced. Further, the conventional 12-pulse rectifier circuit cannot reduce the harmonics of the primary power supply, even when only one load (single unit operation (single operation)) is operated.

本発明は上記問題点に鑑みてなされたもので、安価な高調波相殺装置を提供するとともに、１つの負荷のみを作動させた場合でも、１次電源の高調波を低減させることができる高調波相殺装置を提供することを目的とする。 The present invention has been made in view of the above problems, and provides an inexpensive harmonic canceling device and can reduce the harmonics of the primary power source even when only one load is operated. It is an object of the present invention to provide an offset device.

上記課題を解決し上記目的を達成するために、本発明のうち第１の態様に係るものは、１台のインバータのみを運転させた場合でも高調波を低減できるようにしたデルタ―レス高調波相殺装置において、系統電源と接続する配線に接続され、デルタ結線で構成された１次巻線と、スター結線で構成された２次巻線を有する二巻線変圧器と、一端が系統電源と接続する１次巻線側接続配線と、１次巻線側接続配線の他端と接続され、第１インバータ三相全波整流回路と第１コンデンサを内蔵する第１インバータと、２次巻線に接続された第２三相全波整流回路と、第２三相全波整流回路と第１インバータとを接続する配線に接続され、第２三相全波整流回路と第１インバータに内蔵された第１コンデンサとを導通させる第２スイッチ部と、第２三相全波整流回路と第１インバータとを接続する配線に接続され、第１インバータに内蔵された第１コンデンサの電圧を検出する第１コンデンサ電圧検出機器と、第２三相全波整流回路と第１インバータとを接続する配線に接続され、第２三相全波整流回路と第１インバータに内蔵された第１コンデンサとを導通、非導通させるために前記第２スイッチ部を開閉制御する制御手段と、制御手段は、第１コンデンサ電圧検出機器により検出された第１コンデンサの電圧があらかじめ定められた電圧値以上に達することにより、第２スイッチを閉止して第２三相全波整流回路と第１インバータに内蔵された第１コンデンサとを導通させるとともに、第１インバータからの負荷異常信号を受信することにより、第２スイッチ部を開放して第１インバータに内蔵された第１コンデンサに充電されている電力を放電させるものである。
In order to solve the above problems and achieve the above object, the first aspect of the present invention is a delta-less harmonic that can reduce harmonics even when only one inverter is operated. In the canceling device, a primary winding that is connected to the wiring connected to the system power supply and configured by delta connection, a two-winding transformer having a secondary winding configured by star connection, and one end of the system power supply The primary winding side connection wiring to be connected, the first inverter connected to the other end of the primary winding side connection wiring, the first inverter three-phase full-wave rectifier circuit and the first capacitor, and the secondary winding Connected to the second three-phase full-wave rectifier circuit, the wiring connecting the second three-phase full-wave rectifier circuit and the first inverter, and built in the second three-phase full-wave rectifier circuit and the first inverter. A second switch for conducting the first capacitor; A first capacitor voltage detecting device that is connected to a wiring connecting the phase full-wave rectifier circuit and the first inverter and detects the voltage of the first capacitor built in the first inverter; a second three-phase full-wave rectifier circuit; Control connected to a wiring connecting the first inverter, and controlling the opening and closing of the second switch unit to make the second three-phase full-wave rectifier circuit and the first capacitor built in the first inverter conductive and non-conductive. And the control means closes the second switch and the second three-phase full-wave rectifier circuit when the voltage of the first capacitor detected by the first capacitor voltage detecting device reaches or exceeds a predetermined voltage value. And the first capacitor built in the first inverter are electrically connected to each other, and the load abnormality signal is received from the first inverter, so that the second switch unit is opened and the first inverter is opened. It is intended to discharge the electric power charged in the first capacitor incorporated in the motor.

本発明によれば、二巻線変圧器の２次巻線に接続された第２三相全波整流回路により、一次側（１次巻線側）において第１インバータからの第５次及び第７次の高調波を相殺することができる。これにより、１次電源の高調波を低減させながら第１インバータと接続された第１負荷のみ単独運転することができる。また、第１コンデンサ電圧検出機器により検出された第１コンデンサの電圧があらかじめ定められた電圧値以上に達することにより、第２三相全波整流回路と第１インバータに内蔵された第１コンデンサとを第２スイッチ部により導通させるので、第１コンデンサへの突入電流を防止することができる。 According to the present invention, the second three-phase full-wave rectifier circuit connected to the secondary winding of the two-winding transformer causes the fifth and fifth outputs from the first inverter on the primary side (primary winding side). The seventh harmonic can be canceled out. Thereby, only the 1st load connected with the 1st inverter can be operated independently, reducing the harmonic of a primary power supply. In addition, when the voltage of the first capacitor detected by the first capacitor voltage detecting device reaches a predetermined voltage value or more, the second three-phase full-wave rectifier circuit, the first capacitor built in the first inverter, Is made conductive by the second switch section, so that an inrush current to the first capacitor can be prevented.

本発明のうち第２の態様に係るものは、１台のインバータのみを運転させた場合でも高調波を低減できるようにしたデルタ―レス高調波相殺装置において、系統電源と接続する配線に接続され、スター結線で構成された１次巻線と、デルタ結線で構成された２次巻線を有する二巻線変圧器と、一端が系統電源と接続する１次巻線側接続配線と、１次巻線側接続配線の他端と接続され、第１インバータ三相全波整流回路と第１コンデンサを内蔵する第１インバータと、２次巻線に接続された第２三相全波整流回路と、第２三相全波整流回路と第１インバータとを接続する配線に接続され、第２三相全波整流回路と第１インバータに内蔵された第１コンデンサとを導通させる第２スイッチ部と、第２三相全波整流回路と第１インバータとを接続する配線に接続され、第１インバータに内蔵された第１コンデンサの電圧を検出する第１コンデンサ電圧検出機器と、第２三相全波整流回路と第１インバータとを接続する配線に接続され、第２三相全波整流回路と第１インバータに内蔵された第１コンデンサとを導通、非導通させるために前記第２スイッチ部を開閉制御する制御手段と、制御手段は、第１コンデンサ電圧検出機器により検出された第１コンデンサの電圧があらかじめ定められた電圧値以上に達することにより、第２スイッチを閉止して第２三相全波整流回路と第１インバータに内蔵された第１コンデンサとを導通させるとともに、第１インバータからの負荷異常信号を受信することにより、第２スイッチ部を開放して第１インバータに内蔵された第１コンデンサに充電されている電力を放電させるものである。
The second aspect of the present invention is a delta-less harmonic canceling device that can reduce harmonics even when only one inverter is operated, and is connected to a wiring connected to the system power supply. , A primary winding composed of a star connection, a secondary winding transformer having a secondary winding composed of a delta connection, a primary winding side connection wiring having one end connected to the system power supply, and a primary A first inverter three-phase full-wave rectifier circuit, a first inverter containing a first capacitor, and a second three-phase full-wave rectifier circuit connected to the secondary winding; A second switch unit connected to the wiring connecting the second three-phase full-wave rectifier circuit and the first inverter, and electrically connecting the second three-phase full-wave rectifier circuit and the first capacitor built in the first inverter; , Connecting the second three-phase full-wave rectifier circuit and the first inverter A first capacitor voltage detecting device that is connected to the wiring and detects the voltage of the first capacitor built in the first inverter; and a wiring that connects the second three-phase full-wave rectifier circuit and the first inverter; Control means for controlling the opening and closing of the second switch part in order to make the two three-phase full-wave rectifier circuit and the first capacitor built in the first inverter conductive and non-conductive; When the voltage of the first capacitor detected by the above reaches a predetermined voltage value or more, the second switch is closed, and the second three-phase full-wave rectifier circuit and the first capacitor built in the first inverter are connected. In addition to conducting the load and receiving the load abnormality signal from the first inverter, the second switch unit is opened and the first capacitor built in the first inverter is charged. That is intended to discharge power.

本発明のうち第３の態様に係るものは、１台のインバータのみを運転させた場合でも高調波を低減できるようにしたデルタ―レス高調波相殺装置において、系統電源と接続する配線に接続され、デルタ結線で構成された１次巻線と、スター結線で構成された２次巻線を有する二巻線変圧器と、２次巻線と接続する配線に接続され、第２インバータ三相全波整流回路と第２コンデンサを内蔵する第２インバータと、系統電源と接続する１次巻線側接続配線に接続された第１三相全波整流回路と、第１三相全波整流回路と第２インバータとを接続する配線に接続され、第１三相全波整流回路と第２インバータに内蔵された第２コンデンサとを導通させる第１スイッチ部と、第１三相全波整流回路と第２インバータとを接続する配線に接続され、第２インバータに内蔵された第２コンデンサの電圧を検出する第２コンデンサ電圧検出機器と、第１三相全波整流回路と第２インバータとを接続する配線に接続され、第１三相全波整流回路と第２インバータに内蔵された第２コンデンサとを導通、非導通させるために第１スイッチ部を開閉制御する制御手段と、を有し、制御手段は、第２コンデンサ電圧検出機器により検出された第２コンデンサの電圧があらかじめ定められた電圧値以上に達することにより、第１スイッチを閉止して前記第１三相全波整流回路と前記第２インバータに内蔵された第２コンデンサとを導通させるとともに、第２インバータからの負荷異常信号を受信することにより、第１スイッチ部を開放して前記第２インバータに内蔵された第２コンデンサに充電されている電力を放電させるものである。
The third aspect of the present invention is a delta-less harmonic canceling device that can reduce harmonics even when only one inverter is operated, and is connected to a wiring connected to a system power supply. , A primary winding composed of delta connection, a two-winding transformer having a secondary winding composed of star connection, and a wiring connected to the secondary winding, the second inverter three-phase all A second inverter incorporating a wave rectifier circuit and a second capacitor, a first three-phase full-wave rectifier circuit connected to a primary winding side connection wiring connected to a system power supply, a first three-phase full-wave rectifier circuit, A first switch connected to the wiring connecting the second inverter and electrically connecting the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter; and a first three-phase full-wave rectifier circuit; Connected to the wiring connecting the second inverter, The first three-phase full-wave rectifier circuit is connected to the second capacitor voltage detection device for detecting the voltage of the second capacitor built in the inverter, and the wiring connecting the first three-phase full-wave rectifier circuit and the second inverter. And a control means for controlling the opening and closing of the first switch unit to make the second capacitor built in the second inverter conductive and non-conductive. The control means is detected by the second capacitor voltage detection device. When the voltage of the second capacitor reaches a predetermined voltage value or more, the first switch is closed, and the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter are made conductive. At the same time, by receiving a load abnormality signal from the second inverter, the first switch is opened and the second capacitor built in the second inverter is charged. It is intended to discharge the force.

本発明によれば、１次巻線側接続配線に接続された第１三相全波整流回路により、一次側（１次巻線側）において第２インバータからの第５次及び第７次の高調波を相殺することができる。これにより、１次電源の高調波を低減させながら第２インバータと接続された第２負荷のみ単独運転することができる。また、第２コンデンサ電圧検出機器により検出された第２コンデンサの電圧があらかじめ定められた電圧値以上に達することにより、第１三相全波整流回路と第２インバータに内蔵された第２コンデンサとを第１スイッチ部により導通させるので、第２コンデンサへの突入電流を防止することができる。 According to the present invention, the first three-phase full-wave rectifier circuit connected to the primary winding side connection wiring causes the fifth and seventh orders from the second inverter on the primary side (primary winding side). Harmonics can be canceled out. Thereby, only the 2nd load connected with the 2nd inverter can be operated independently, reducing the harmonic of a primary power supply. Further, when the voltage of the second capacitor detected by the second capacitor voltage detecting device reaches a predetermined voltage value or more, the second capacitor built in the first three-phase full-wave rectifier circuit and the second inverter; Is made conductive by the first switch portion, and an inrush current to the second capacitor can be prevented.

本発明のうち第４の態様に係るものは、１台のインバータのみを運転させた場合でも高調波を低減できるようにしたデルタ―レス高調波相殺装置において、系統電源と接続する配線に接続され、スター結線で構成された１次巻線と、デルタ結線で構成された２次巻線を有する二巻線変圧器と、２次巻線と接続する配線に接続され、第２インバータ三相全波整流回路と第２コンデンサを内蔵する第２インバータと、系統電源と接続する１次巻線側接続配線に接続された第１三相全波整流回路と、第１三相全波整流回路と第２インバータとを接続する配線に接続され、第１三相全波整流回路と第２インバータに内蔵された第２コンデンサとを導通させる第１スイッチ部と、第１三相全波整流回路と第２インバータとを接続する配線に接続され、第２インバータに内蔵された第２コンデンサの電圧を検出する第２コンデンサ電圧検出機器と、第１三相全波整流回路と第２インバータとを接続する配線に接続され、第１三相全波整流回路と第２インバータに内蔵された第２コンデンサとを導通、非導通させるために第１スイッチ部を開閉制御する制御手段と、を有し、制御手段は、第２コンデンサ電圧検出機器により検出された第２コンデンサの電圧があらかじめ定められた電圧値以上に達することにより、第１スイッチを閉止して前記第１三相全波整流回路と前記第２インバータに内蔵された第２コンデンサとを導通させるとともに、第２インバータからの負荷異常信号を受信することにより、第１スイッチ部を開放して前記第２インバータに内蔵された第２コンデンサに充電されている電力を放電させるものである。
According to a fourth aspect of the present invention, there is provided a delta-less harmonic canceling apparatus capable of reducing harmonics even when only one inverter is operated, and is connected to a wiring connected to a system power supply. , Connected to a primary winding composed of star connection, a secondary winding transformer composed of a secondary winding composed of delta connection, and wiring connected to the secondary winding, A second inverter incorporating a wave rectifier circuit and a second capacitor, a first three-phase full-wave rectifier circuit connected to a primary winding side connection wiring connected to a system power supply, a first three-phase full-wave rectifier circuit, A first switch connected to the wiring connecting the second inverter and electrically connecting the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter; and a first three-phase full-wave rectifier circuit; Connected to the wiring connecting the second inverter, The first three-phase full-wave rectifier circuit is connected to the second capacitor voltage detection device for detecting the voltage of the second capacitor built in the inverter, and the wiring connecting the first three-phase full-wave rectifier circuit and the second inverter. And a control means for controlling the opening and closing of the first switch unit to make the second capacitor built in the second inverter conductive and non-conductive. The control means is detected by the second capacitor voltage detection device. When the voltage of the second capacitor reaches a predetermined voltage value or more, the first switch is closed, and the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter are made conductive. At the same time, by receiving a load abnormality signal from the second inverter, the first switch is opened and the second capacitor built in the second inverter is charged. It is intended to discharge the force.

本発明のうち第５の態様に係るものは、第１の態様〜第４の態様のいずれかに係るデルタ―レス高調波相殺装置であって、１次巻線側接続配線は、直列リアクトルが接続されていることを特徴とすることを特徴とするものである。 According to a fifth aspect of the present invention, there is provided a delta-less harmonic canceling device according to any one of the first to fourth aspects, wherein the primary winding side connection wiring includes a series reactor. It is characterized by being connected.

本発明によれば、１次巻線側接続配線に直列リアクトルを接続させることにより二巻線変圧器で電圧降下した電圧と同等の電圧を直列リアクトルで電圧降下させて、インバータ（第１インバータ、第２インバータ）への入力電圧を等しくすることができる。これにより第５次及び第７次の高調波の大きさも等しくなり、一次側（１次巻線側）において第５次及び第７次の高調波を相殺させることができる。 According to the present invention, by connecting a series reactor to the primary winding side connection wiring, the voltage equivalent to the voltage dropped by the two-winding transformer is dropped by the series reactor, and the inverter (first inverter, The input voltage to the second inverter) can be made equal. Thereby, the magnitudes of the fifth and seventh harmonics are also equalized, and the fifth and seventh harmonics can be canceled on the primary side (primary winding side).

本発明によれば、１つの二巻線変圧器を用いて、一次側（１次巻線側）において第５次及び第７次の高調波を相殺することができ、高調波相殺装置を安価な装置にすることができる。 According to the present invention, it is possible to cancel the fifth and seventh harmonics on the primary side (primary winding side) using one two-winding transformer, and to reduce the cost of the harmonic cancellation device. Device.

本発明の第１実施形態におけるデルタ―レス高調波相殺装置の回路図である。1 is a circuit diagram of a delta-less harmonic cancellation device in a first embodiment of the present invention. FIG. 本発明の第２実施形態におけるデルタ―レス高調波相殺装置の回路図である。It is a circuit diagram of the delta-less harmonic cancellation apparatus in 2nd Embodiment of this invention. 本発明の変形例１におけるデルタ―レス高調波相殺装置の回路図である。It is a circuit diagram of the delta-less harmonic cancellation apparatus in the modification 1 of this invention. 本発明の変形例２におけるデルタ―レス高調波相殺装置の回路図である。It is a circuit diagram of the delta-less harmonic cancellation apparatus in the modification 2 of this invention. 従来の１２パルス整流回路を示す図である。It is a figure which shows the conventional 12 pulse rectifier circuit.

（第１実施形態）
以下、本発明の第１実施形態のデルタ―レス高調波相殺装置について図面を参照にしながら説明する。ここで、図１は、本発明の第１実施形態におけるデルタ―レス高調波相殺装置の回路図である。 (First embodiment)
Hereinafter, a delta-less harmonic cancellation apparatus according to a first embodiment of the present invention will be described with reference to the drawings. Here, FIG. 1 is a circuit diagram of the delta-less harmonic cancellation device in the first embodiment of the present invention.

図１に示すように、デルタ―レス高調波相殺装置１は、二巻線変圧器２、直列リアクトル１９、第１インバータ３、第２三相全波整流回路４、第２スイッチ部５、制御回路６、第２インバータ１３から構成されている。なお、本実施形態では、説明の便宜上、「第２三相全波整流回路４＋第２スイッチ部５＋制御回路６」と「第２インバータ１３」を図１に併記しているが、実際は「第２三相全波整流回路４＋第２スイッチ部５＋制御回路６」と「第２インバータ１３」のいずれか一方のみが備わっている。また、本実施形態では、直列リアクトル１９を設けて説明するが、これに限らず、一次側（１次巻線側）における第５次及び第７次の高調波の相殺が許容範囲内であれば、直列リアクトル１９を省略してもよい。 As shown in FIG. 1, the delta-less harmonic cancellation device 1 includes a two-winding transformer 2, a series reactor 19, a first inverter 3, a second three-phase full-wave rectifier circuit 4, a second switch unit 5, and a control. The circuit 6 and the second inverter 13 are included. In the present embodiment, for convenience of explanation, “second three-phase full-wave rectifier circuit 4 + second switch unit 5 + control circuit 6” and “second inverter 13” are shown together in FIG. 2) three-phase full-wave rectifier circuit 4 + second switch unit 5 + control circuit 6 ”and“ second inverter 13 ”. In the present embodiment, the series reactor 19 is described. However, the present invention is not limited to this, and the fifth and seventh harmonics on the primary side (primary winding side) can be offset within an allowable range. For example, the series reactor 19 may be omitted.

二巻線変圧器２は、デルタ結線で構成された１次巻線２ａと、スター結線で構成された２次巻線２ｂを有するものである。そして、二巻線変圧器２の１次巻線２ａは端子Ｒ、Ｓ、Ｔにより系統電源に接続され、また、二巻線変圧器２の２次巻線２ｂは端子Ｕ２、Ｖ２、Ｗ２により第２三相全波整流回路４に接続されている。また、二巻線変圧器２には漏電遮断器用コンデンサが接続されている（第２実施形態、変形例も同様）。 The two-winding transformer 2 has a primary winding 2a configured by delta connection and a secondary winding 2b configured by star connection. The primary winding 2a of the two-winding transformer 2 is connected to the system power supply by terminals R, S, T, and the secondary winding 2b of the two-winding transformer 2 is connected by terminals U2, V2, W2. The second three-phase full-wave rectifier circuit 4 is connected. Moreover, the capacitor | condenser for earth-leakage circuit breakers is connected to the two-winding transformer 2 (2nd Embodiment and a modification are also the same).

直列リアクトル１９は、一方が系統電源と接続する１次巻線側接続配線２０の端子Ｒ、Ｓ、Ｔに接続され、また、他方が第１インバータ３と接続する１次巻線側接続配線２０の端子Ｕ１、Ｖ１、Ｗ１に接続されている。ここで、２次巻線２ｂの出力電圧と直列リアクトル１９を介した１次巻線側接続配線２０の出力電圧とは略３０度の位相差を有している。 One of the series reactors 19 is connected to terminals R, S, and T of the primary winding side connection wiring 20 that is connected to the system power supply, and the other side is connected to the primary winding side connection wiring 20 that is connected to the first inverter 3. Are connected to the terminals U1, V1, and W1. Here, the output voltage of the secondary winding 2b and the output voltage of the primary winding side connection wiring 20 via the series reactor 19 have a phase difference of about 30 degrees.

第１インバータ３は、１次巻線側接続配線２０と接続され、三相全波整流回路である第１インバータ三相全波整流回路７と突流防止機器８と第１コンデンサ９と三相フルブリッジ回路１０を内蔵している。突流防止機器８は、第１インバータ三相全波整流回路７と第１コンデンサ９との間に接続された突入電流防止用の抵抗から構成されている。この突入電流防止用の抵抗により電源電圧が供給開始された際の突入電流を小さくすることができる。三相フルブリッジ回路１０は直流電圧を交流電圧に変換し、その変換された交流電圧は圧力ポンプや送風ファンなどの負荷に送られる。 The first inverter 3 is connected to the primary winding side connection wiring 20, and the first inverter three-phase full-wave rectifier circuit 7, which is a three-phase full-wave rectifier circuit, the rush prevention device 8, the first capacitor 9, and the three-phase full A bridge circuit 10 is incorporated. The inrush preventing device 8 is configured by a resistor for preventing an inrush current connected between the first inverter three-phase full-wave rectifier circuit 7 and the first capacitor 9. This inrush current preventing resistor can reduce the inrush current when the supply voltage is started. The three-phase full bridge circuit 10 converts a DC voltage into an AC voltage, and the converted AC voltage is sent to a load such as a pressure pump or a blower fan.

第２三相全波整流回路４は二巻線変圧器２の２次巻線２ｂと接続され、この第２三相全波整流回路４と第１コンバータ３の間に第２スイッチ部５が接続されている。そして、この第２スイッチ部５を閉止することにより、第２三相全波整流回路４と第１インバータ３に内蔵された第１コンデンサ９とが導通する。 The second three-phase full-wave rectifier circuit 4 is connected to the secondary winding 2 b of the two-winding transformer 2, and a second switch unit 5 is provided between the second three-phase full-wave rectifier circuit 4 and the first converter 3. It is connected. Then, by closing the second switch unit 5, the second three-phase full-wave rectifier circuit 4 and the first capacitor 9 built in the first inverter 3 are brought into conduction.

第２インバータ１３は、二巻線変圧器２の２次巻線２ｂと接続され、第２インバータ三相全波整流回路１１と第２コンデンサ１２などを内蔵している。ここで、第２インバータ１３の具体的構成は、後述する第２実施形態（図２参照）と同様であるので説明は省略する。 The second inverter 13 is connected to the secondary winding 2b of the two-winding transformer 2, and includes a second inverter three-phase full-wave rectifier circuit 11, a second capacitor 12, and the like. Here, since the specific configuration of the second inverter 13 is the same as that of a second embodiment (see FIG. 2) described later, the description thereof is omitted.

制御回路６（制御手段）は、第２三相全波整流回路４と第１インバータ３とを接続する配線に接続され、電源が停止した際の停止信号および第１インバータ３が故障した際の負荷異常信号を受信して、第２スイッチ部５を開放制御するものである。また、制御回路６には、１インバータ３に内蔵されている第１コンデンサ９のコンデンサ電圧を検出する第１コンデンサ電圧検出機器（図示略）が内蔵されている。そして、１コンデンサ電圧検出機器により検出された第１コンデンサ９の電圧があらかじめ定められた電圧値（使用電圧×１．４１×０．９５）以上に達することにより、第２三相全波整流回路４と第１インバータ３に内蔵された第１コンデンサ９とを第２スイッチ部５により導通させる。 The control circuit 6 (control means) is connected to the wiring that connects the second three-phase full-wave rectifier circuit 4 and the first inverter 3, and a stop signal when the power supply is stopped and when the first inverter 3 breaks down. The load abnormality signal is received and the second switch unit 5 is controlled to be opened. Further, the control circuit 6 incorporates a first capacitor voltage detection device (not shown) for detecting the capacitor voltage of the first capacitor 9 built in the one inverter 3. When the voltage of the first capacitor 9 detected by the one-capacitor voltage detecting device reaches a predetermined voltage value (use voltage × 1.41 × 0.95) or more, the second three-phase full-wave rectifier circuit 4 and the first capacitor 9 built in the first inverter 3 are made conductive by the second switch unit 5.

次に、本発明の第１実施形態におけるデルタ―レス高調波相殺装置を用いた動作手順について説明する。 Next, an operation procedure using the delta-less harmonic cancellation device in the first embodiment of the present invention will be described.

まず、系統電源からデルタ―レス高調波相殺装置１に電力が供給されると第１コンデンサ９が充電される。そして、制御回路６に内蔵された第１コンデンサ電圧検出機器（図示略）により第１コンデンサの電圧が検出され、その検出された第１コンデンサの電圧があらかじめ定められた電圧値（使用電圧×１．４１×０．９５）に達することにより、第２スイッチ部５を閉止させ、第２三相全波整流回路４と第１インバータ３に内蔵された第１コンデンサ９とを導通させる。これにより、第１インバータ３の起動時において、第２三相全波整流回路を介する第１コンデンサ３への突流充電電流を防止することができる。 First, when electric power is supplied from the system power supply to the delta-less harmonic cancellation device 1, the first capacitor 9 is charged. Then, the voltage of the first capacitor is detected by a first capacitor voltage detection device (not shown) built in the control circuit 6, and the detected voltage of the first capacitor is a predetermined voltage value (use voltage × 1 .41 × 0.95), the second switch unit 5 is closed, and the second three-phase full-wave rectifier circuit 4 and the first capacitor 9 built in the first inverter 3 are made conductive. Thereby, at the time of starting of the 1st inverter 3, the rush charging current to the 1st capacitor | condenser 3 via a 2nd 3 phase full wave rectifier circuit can be prevented.

第１コンデンサの電圧があらかじめ定められた電圧値に達した後は、第２三相全波整流回路４と第１インバータ３に内蔵された第１コンデンサ９とを導通させた状態が維持される。そして、この場合において、第１インバータ３に内蔵された第１コンデンサ９で高調波が発生するが、二巻線変圧器２の２次巻線２ｂに接続された第２三相全波整流回路４により、一次側（１次巻線２ａ側）において、第１インバータ３からの第５次及び第７次の高調波を相殺することができる。これにより、１次電源の高調波を低減させながら第１インバータ３と接続された第１負荷のみ単独運転することができる。なお、本実施形態では、二巻線変圧器２の２次巻線２ｂに接続された第２三相全波整流回路４を用いて、第１インバータ３からの第５次及び第７次の高調波を一次側（１次巻線２ａ側）において相殺させる構成にしているが、これに代えて、第２三相全波整流回路４を用いず、第２インバータ１３の第２インバータ三相全波整流回路１１を用いて、一次側（１次巻線２ａ側）において第１インバータ３からの第５次及び第７次の高調波を相殺させるようにしてもよい。 After the voltage of the first capacitor reaches a predetermined voltage value, the state in which the second three-phase full-wave rectifier circuit 4 and the first capacitor 9 built in the first inverter 3 are made conductive is maintained. . In this case, harmonics are generated by the first capacitor 9 built in the first inverter 3, but the second three-phase full-wave rectifier circuit connected to the secondary winding 2 b of the two-winding transformer 2. 4, the fifth and seventh harmonics from the first inverter 3 can be canceled on the primary side (primary winding 2 a side). Thereby, only the 1st load connected with the 1st inverter 3 can be independently operated, reducing the harmonic of a primary power supply. In the present embodiment, the fifth and seventh orders from the first inverter 3 using the second three-phase full-wave rectifier circuit 4 connected to the secondary winding 2 b of the two-winding transformer 2. The harmonics are canceled on the primary side (primary winding 2a side), but instead of this, the second three-phase full-wave rectifier circuit 4 is not used and the second inverter three-phase of the second inverter 13 is used. The full-wave rectifier circuit 11 may be used to cancel the fifth and seventh harmonics from the first inverter 3 on the primary side (primary winding 2a side).

第１インバータ３が作動している途中に、制御回路が系統電源の停止信号または第１インバータ３の負荷異常信号を受信することにより、第２スイッチ部５を開放させ、第１インバータ３に内蔵された第１コンデンサ９に充電されている電力を放電する。 While the first inverter 3 is operating, the control circuit receives the stop signal of the system power supply or the load abnormality signal of the first inverter 3, thereby opening the second switch unit 5 and incorporating it in the first inverter 3. The electric power charged in the first capacitor 9 is discharged.

以上説明したように、三巻線変圧器や２つの二巻線変圧器を用いず、１つの二巻線変圧器２を用いて、一次側（１次巻線側）において第５次及び第７次の高調波を相殺することができ、高調波相殺装置を安価な装置にすることができる。また、二巻線変圧器２の２次巻線２ｂに接続されている第２三相全波整流回路４または第２インバータ１３の第２インバータ三相全波整流回路１１により、一次側（１次巻線２ａ側）において第１インバータ３からの第５次及び第７次の高調波を相殺することができる。さらに、本実施形態では、一方のインバータが故障により作動しなくなった場合でも、作動可能なインバータを第１インバータ側に配置することにより、または、故障して作動しなくなったインバー側に第２三相全波整流回路４、第２スイッチ部５および制御回路６に内蔵された第１コンデンサ電圧検出機器などを接続することにより、１台のインバータのみ運転を続行することができる。また、第２スイッチ部５は、第１コンデンサ電圧検出機器により検出された第１コンデンサの電圧があらかじめ定められた電圧値（使用電圧×１．４１×０．９５）以上に達することにより、第２三相全波整流回路４と第１インバータ３に内蔵された第１コンデンサ９とを導通させるので、第１コンデンサ９への突入電流を防止することができる。 As described above, the fifth and the fifth are used on the primary side (primary winding side) by using one two-winding transformer 2 without using a three-winding transformer or two two-winding transformers. The seventh harmonic can be canceled out, and the harmonic canceling device can be made inexpensive. Further, the second side three-phase full-wave rectifier circuit 4 connected to the secondary winding 2b of the two-winding transformer 2 or the second inverter three-phase full-wave rectifier circuit 11 of the second inverter 13 causes the primary side (1 The fifth and seventh harmonics from the first inverter 3 can be canceled at the secondary winding 2a side. Further, in the present embodiment, even when one inverter stops operating due to a failure, the second inverter is arranged on the inverter side where the operable inverter is arranged on the first inverter side or on the invert side that has failed due to a failure. By connecting the first capacitor voltage detection device incorporated in the phase full-wave rectifier circuit 4, the second switch unit 5, and the control circuit 6, it is possible to continue the operation of only one inverter. Further, the second switch unit 5 is configured so that the voltage of the first capacitor detected by the first capacitor voltage detection device reaches or exceeds a predetermined voltage value (usage voltage × 1.41 × 0.95). 2 Since the three-phase full-wave rectifier circuit 4 and the first capacitor 9 built in the first inverter 3 are made conductive, an inrush current to the first capacitor 9 can be prevented.

（第２実施形態）
次に、本発明にかかる第２実施形態におけるデルタ―レス高調波相殺装置２１について説明する。ここで、図２は本発明の第２実施形態におけるデルタ―レス高調波相殺装置の回路図である。 (Second Embodiment)
Next, the delta-less harmonic cancellation device 21 according to the second embodiment of the present invention will be described. Here, FIG. 2 is a circuit diagram of the delta-less harmonic canceling apparatus in the second embodiment of the present invention.

本発明の第１実施形態と第２実施形態の異なるところは、第１実施形態のデルタ―レス高調波相殺装置１では、１次巻線側接続配線２０に直列リアクトル１９を介し第１インバータ３を接続し、２次巻線２ｂに第２三相全波整流回路４を接続させるとともに、第２インバータ三相全波整流回路１１と第２コンデンサ１２を内蔵する第２インバータ１３を接続したが、第２実施形態のデルタ―レス高調波相殺装置２１では、１次巻線側接続配線２２に直列リアクトル２３を介し第１三相全波整流回路１４を接続させるとともに、第１インバータ三相全波整流回路７と第１コンデンサ９を内蔵する第１インバータ３を接続し、２次巻線２ｂに第２インバータ三相全波整流回路１１と第２コンデンサ１２などを内蔵する第２インバータ１３を接続させているところが異なる。なお、第２実施形態においては、第１実施形態と異なるところを中心に説明する。また、第２実施形態では、第１実施形態と同一構成については、同一符号を用い、同一作用効果を奏するものとし説明は省略する。さらに、本実施形態では、説明の便宜上、「第１三相全波整流回路１４＋第１スイッチ部１５＋制御回路１６」と「第１インバータ３」を図２に併記しているが、実際は「第１三相全波整流回路１４＋第１スイッチ部１５＋制御回路１６」と「第１インバータ３」のいずれか一方のみが備わっている。また、本実施形態では、直列リアクトル２３を設けて説明するが、これに限らず、一次側（１次巻線側）における第５次及び第７次の高調波の相殺が許容範囲内であれば、直列リアクトル２３を省略してもよい。 The difference between the first embodiment and the second embodiment of the present invention is that in the delta-less harmonic canceling device 1 of the first embodiment, the first inverter 3 is connected to the primary winding side connection wiring 20 via the series reactor 19. The second three-phase full-wave rectifier circuit 4 is connected to the secondary winding 2b, and the second inverter three-phase full-wave rectifier circuit 11 and the second inverter 13 containing the second capacitor 12 are connected to the secondary winding 2b. In the delta-less harmonic canceling device 21 of the second embodiment, the first three-phase full-wave rectifier circuit 14 is connected to the primary winding side connection wiring 22 via the series reactor 23, and the first inverter three-phase full-wave rectifier circuit 21 is connected. A wave rectifier circuit 7 and a first inverter 3 including a first capacitor 9 are connected, and a second inverter 13 including a second inverter three-phase full-wave rectifier circuit 11, a second capacitor 12 and the like in a secondary winding 2b. Connected And the place is different. Note that the second embodiment will be described with a focus on differences from the first embodiment. Moreover, in 2nd Embodiment, about the same structure as 1st Embodiment, the same code | symbol is used and the same effect is demonstrated and description is abbreviate | omitted. Furthermore, in this embodiment, for convenience of explanation, “first three-phase full-wave rectifier circuit 14 + first switch unit 15 + control circuit 16” and “first inverter 3” are shown in FIG. One three-phase full-wave rectifier circuit 14 + first switch unit 15 + control circuit 16 ”or“ first inverter 3 ”is provided. In this embodiment, the series reactor 23 is described. However, the present invention is not limited to this, and the fifth and seventh harmonics on the primary side (primary winding side) can be offset within an allowable range. For example, the series reactor 23 may be omitted.

図２に示すように、第２実施形態では、デルタ結線で構成された１次巻線２ａと、およびスター結線で構成された２次巻線２ｂを有する二巻線変圧器２と、二巻線変圧器２の２次巻線２ｂと接続され、第２インバータ三相全波整流回路１１と突流防止装置１７と第２コンデンサ１２と三相フルブリッジ回路１８を内蔵する第２インバータ１３と、１次巻線側接続配線２２に直列リアクトル２３を介し接続された第１三相全波整流回路１４と、第１三相全波整流回路１４と第２インバータ１３とを接続する配線に設けられ、第１三相全波整流回路１４と第２インバータ１３に内蔵された第２コンデンサ１２とを導通させる第１スイッチ部１５と、第１三相全波整流回路１４と第２インバータ１３とを接続する配線に接続され、第２インバータ１３に内蔵された第２コンデンサ１２の電圧を検出する第２コンデンサ電圧検出機器（図示略）と、を有し、第１スイッチ部１５は、第２コンデンサ電圧検出機器により検出された第２コンデンサ１２の電圧があらかじめ定められた電圧値以上に達することにより、第１三相全波整流回路１４と第２インバータ１３に内蔵された第２コンデンサ１２とを導通させるものである。ここで、第２コンデンサ電圧検出機器は、第１実施形態同様、制御装置１６に内蔵されている。なお、突流防止装置１７および三相フルブリッジ回路１８については第１実施形態の第１コンデンサ３の突流防止装置８および三相フルブリッジ回路１０と同様であるので説明は省略する。また、本実施形態において、１次巻線側接続配線２２に接続された第１三相全波整流回路１４を用いて、第２インバータ１３からの第５次及び第７次の高調波を一次側（１次巻線２ａ側）において相殺させる構成にしているが、これに代えて、第１三相全波整流回路１４を用いないで、第１インバータ３の第１インバータ三相全波整流回路７を用いて、一次側（１次巻線２ａ側）において第２インバータ３からの第５次及び第７次の高調波を相殺させるようにしてもよい。 As shown in FIG. 2, in the second embodiment, a primary winding 2 a configured by delta connection, a two-winding transformer 2 having a secondary winding 2 b configured by star connection, A second inverter 13 connected to the secondary winding 2b of the line transformer 2 and incorporating the second inverter three-phase full-wave rectifier circuit 11, the inrush prevention device 17, the second capacitor 12, and the three-phase full bridge circuit 18, The first three-phase full-wave rectifier circuit 14 connected to the primary winding side connection wiring 22 via the series reactor 23, and the wiring connecting the first three-phase full-wave rectifier circuit 14 and the second inverter 13 are provided. The first switch unit 15 for conducting the first three-phase full-wave rectifier circuit 14 and the second capacitor 12 built in the second inverter 13, the first three-phase full-wave rectifier circuit 14, and the second inverter 13 Connected to the wiring to be connected, the second inverter 1 And a second capacitor voltage detecting device (not shown) for detecting the voltage of the second capacitor 12 incorporated in the first capacitor unit, and the first switch unit 15 includes the second capacitor 12 detected by the second capacitor voltage detecting device. When the voltage reaches a predetermined voltage value or more, the first three-phase full-wave rectifier circuit 14 and the second capacitor 12 built in the second inverter 13 are brought into conduction. Here, the 2nd capacitor voltage detection apparatus is built in control device 16 like a 1st embodiment. Note that the rush prevention device 17 and the three-phase full bridge circuit 18 are the same as the rush prevention device 8 and the three-phase full bridge circuit 10 of the first capacitor 3 in the first embodiment, and thus description thereof is omitted. In the present embodiment, the fifth and seventh harmonics from the second inverter 13 are first-ordered using the first three-phase full-wave rectifier circuit 14 connected to the primary winding side connection wiring 22. However, instead of using the first three-phase full-wave rectifier circuit 14, the first inverter three-phase full-wave rectification of the first inverter 3 is used. The circuit 7 may be used to cancel the fifth and seventh harmonics from the second inverter 3 on the primary side (primary winding 2a side).

以上説明したように、第１実施形態同様、三巻線変圧器や２つの二巻線変圧器を用いず、１つの二巻線変圧器２を用いて、一次側（１次巻線側）において第５次及び第７次の高調波を相殺することができ、高調波相殺装置を安価な装置にすることができる。また、１次巻線側接続配線２２に接続された第１三相全波整流回路１４により、一次側（１次巻線２ａ側）において第２インバータ１３からの第５次及び第７次の高調波を相殺することができる。これにより、一方のインバータが故障により作動しなくなった場合でも、作動可能なインバータを第２インバータ１３側に配置させることにより、または、故障して作動しなくなったインバー側に第１三相全波整流回路１４、第１スイッチ部１５および制御回路１６に内蔵された第１コンデンサ電圧検出機器などを接続することにより、１台のインバータのみの運転を続行することができる。また、第２コンデンサ電圧検出機器（図示略）により検出された第２コンデンサの電圧があらかじめ定められた電圧値以上に達することにより、第１三相全波整流回路１４と第２インバータ１３に内蔵された第２コンデンサ１２とを第１スイッチ部１５により導通させるので、第２コンデンサ１２への突入電流を防止することができる。 As described above, the primary side (primary winding side) is used without using a three-winding transformer or two two-winding transformers and using one two-winding transformer 2 as in the first embodiment. 5 can cancel the fifth and seventh harmonics, and the harmonic canceling device can be made inexpensive. The first three-phase full-wave rectifier circuit 14 connected to the primary winding side connection wiring 22 causes the fifth and seventh orders from the second inverter 13 on the primary side (primary winding 2a side). Harmonics can be canceled out. As a result, even if one inverter stops operating due to a failure, the first three-phase full-wave is placed on the inverter side where the operable inverter is arranged on the second inverter 13 side or on the invar side that has failed and does not operate. By connecting the rectifier circuit 14, the first switch unit 15 and the first capacitor voltage detection device built in the control circuit 16, etc., the operation of only one inverter can be continued. Further, when the voltage of the second capacitor detected by the second capacitor voltage detecting device (not shown) reaches or exceeds a predetermined voltage value, it is built in the first three-phase full-wave rectifier circuit 14 and the second inverter 13. Since the conducted second capacitor 12 is made conductive by the first switch unit 15, an inrush current to the second capacitor 12 can be prevented.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

以下、本発明の変形例について説明する。 Hereinafter, modifications of the present invention will be described.

（変形例）
本発明の第１実施形態（第２実施形態）と変形例１（変形例２）の異なるところは、第１実施形態（第２実施形態）のデルタ―レス高調波相殺装置１（デルタ―レス高調波相殺装置２１）では、デルタ結線で構成された１次巻線２ａと、スター結線で構成された２次巻線２ｂを有する二巻線変圧器を用いてが、変形例１（変形例２）では、スター結線で構成された１次巻線２４ａ（１次巻線２５ａ）と、デルタ結線で構成された２次巻線２４ｂ（２５ｂ）を有する二巻線変圧器２４（二巻線変圧器２５）を用いたところが異なる。ここで、図３は本発明の変形例１におけるデルタ―レス高調波相殺装置の回路図であり、図４は本発明の変形例２におけるデルタ―レス高調波相殺装置の回路図である。なお、変形例１（変形例２）については、上述した第１実施形態（第２実施形態）の説明から容易に理解できるので、変形例１（変形例２）の具体的な内容の説明は省略する。 (Modification)
The difference between the first embodiment (second embodiment) of the present invention and the modified example 1 (modified example 2) is that the delta-less harmonic cancellation device 1 (delta-less) of the first embodiment (second embodiment). The harmonic canceling device 21) uses a two-winding transformer having a primary winding 2a constituted by a delta connection and a secondary winding 2b constituted by a star connection. 2), a two-winding transformer 24 (two windings) having a primary winding 24a (primary winding 25a) configured by star connection and a secondary winding 24b (25b) configured by delta connection. The difference is that the transformer 25) is used. Here, FIG. 3 is a circuit diagram of the delta-less harmonic cancellation device in the first modification of the present invention, and FIG. 4 is a circuit diagram of the delta-less harmonic cancellation device in the second modification of the present invention. Since Modification 1 (Modification 2) can be easily understood from the description of the first embodiment (second embodiment) described above, the specific content of Modification 1 (Modification 2) will not be described. Omitted.

１デルタ―レス高調波相殺装置
２二巻線変圧器
３第１インバータ
４第２三相全波整流回路
５第２スイッチ部
６制御回路
７第１インバータ三相全波整流回路
８突流防止機器
９第１コンデンサ
１０三相フルブリッジ回路
１１第２インバータ三相全波整流回路
１２第２コンデンサ
１３第２インバータ
１４第１三相全波整流回路
１５第１スイッチ部
１６制御回路
１７突流防止機器
１８三相フルブリッジ回路
１９直列リアクトル
２０１次巻線側接続配線
２１デルタ―レス高調波相殺装置
２２１次巻線側接続配線
２３直列リアクトル
２４二巻線変圧器
２５二巻線変圧器
DESCRIPTION OF SYMBOLS 1 Delta-less harmonic cancellation apparatus 2 Two-winding transformer 3 1st inverter 4 2nd 3 phase full wave rectifier circuit 5 2nd switch part 6 Control circuit 7 1st inverter 3 phase full wave rectifier circuit 8 First capacitor 10 Three-phase full bridge circuit 11 Second inverter three-phase full-wave rectifier circuit 12 Second capacitor 13 Second inverter 14 First three-phase full-wave rectifier circuit 15 First switch unit 16 Control circuit 17 Overflow prevention device 18 Three Phase full bridge circuit 19 Series reactor 20 Primary winding side connection wiring 21 Delta-less harmonic canceling device 22 Primary winding side connection wiring 23 Series reactor 24 Two winding transformer 25 Two winding transformer

Claims

In a delta-less harmonic cancellation device that can reduce harmonics even when only one inverter is operated,
A two-winding transformer having a primary winding constituted by a delta connection and a secondary winding constituted by a star connection, connected to a wiring connected to a system power supply;
Primary winding side connection wiring with one end connected to the system power supply,
A first inverter connected to the other end of the primary winding side connection wiring and including a first inverter three-phase full-wave rectifier circuit and a first capacitor;
A second three-phase full-wave rectifier circuit connected to the secondary winding;
The second three-phase full-wave rectifier circuit is connected to the wiring connecting the first inverter, and the second three-phase full-wave rectifier circuit and the first capacitor built in the first inverter are electrically connected. A switch part;
A first capacitor voltage detecting device connected to a wiring connecting the second three-phase full-wave rectifier circuit and the first inverter, and detecting a voltage of a first capacitor built in the first inverter;
Connected to the wiring connecting the second three-phase full-wave rectifier circuit and the first inverter, and conductive and non-conductive between the second three-phase full-wave rectifier circuit and the first capacitor built in the first inverter. Control means for controlling the opening and closing of the second switch part in order to
The control means closes the second switch to cause the second three-phase full wave when the voltage of the first capacitor detected by the first capacitor voltage detecting device reaches or exceeds a predetermined voltage value. The rectifier circuit is electrically connected to the first capacitor built in the first inverter, and the load switching signal is received from the first inverter, so that the second switch unit is opened to be built in the first inverter. A delta-less harmonic cancellation device that discharges the electric power charged in the first capacitor.

In a delta-less harmonic cancellation device that can reduce harmonics even when only one inverter is operated,
A two-winding transformer having a primary winding constituted by a star connection and a secondary winding constituted by a delta connection, connected to a wiring connected to the system power supply;
Primary winding side connection wiring with one end connected to the system power supply,
A first inverter connected to the other end of the primary winding side connection wiring and including a first inverter three-phase full-wave rectifier circuit and a first capacitor;
A second three-phase full-wave rectifier circuit connected to the secondary winding;
The second three-phase full-wave rectifier circuit is connected to the wiring connecting the first inverter, and the second three-phase full-wave rectifier circuit and the first capacitor built in the first inverter are electrically connected. A switch part;
A first capacitor voltage detecting device connected to a wiring connecting the second three-phase full-wave rectifier circuit and the first inverter, and detecting a voltage of a first capacitor built in the first inverter;
Connected to the wiring connecting the second three-phase full-wave rectifier circuit and the first inverter, and conductive and non-conductive between the second three-phase full-wave rectifier circuit and the first capacitor built in the first inverter. Control means for controlling the opening and closing of the second switch part in order to
The control means closes the second switch to cause the second three-phase full wave when the voltage of the first capacitor detected by the first capacitor voltage detecting device reaches or exceeds a predetermined voltage value. The rectifier circuit is electrically connected to the first capacitor built in the first inverter, and the load switching signal is received from the first inverter, so that the second switch unit is opened to be built in the first inverter. A delta-less harmonic cancellation device that discharges the electric power charged in the first capacitor.

In a delta-less harmonic cancellation device that can reduce harmonics even when only one inverter is operated,
A two-winding transformer having a primary winding constituted by a delta connection and a secondary winding constituted by a star connection, connected to a wiring connected to a system power supply;
A second inverter that is connected to the wiring connected to the secondary winding and includes a second inverter three-phase full-wave rectifier circuit and a second capacitor;
A first three-phase full-wave rectifier circuit connected to the primary winding side connection wiring connected to the system power supply;
The first three-phase full-wave rectifier circuit is connected to the wiring connecting the second inverter, and the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter are electrically connected to each other. A switch part;
A second capacitor voltage detecting device connected to a wiring connecting the first three-phase full-wave rectifier circuit and the second inverter, and detecting a voltage of a second capacitor built in the second inverter;
Connected to a wiring connecting the first three-phase full-wave rectifier circuit and the second inverter, and electrically connects and disconnects the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter. Control means for controlling the opening and closing of the first switch part in order to
The control means closes the first switch when the voltage of the second capacitor detected by the second capacitor voltage detection device reaches or exceeds a predetermined voltage value, and the first three-phase full wave The rectifier circuit is electrically connected to the second capacitor built in the second inverter, and a load abnormality signal is received from the second inverter, so that the first switch part is opened to be built in the second inverter. A delta-less harmonic cancellation device that discharges the electric power charged in the second capacitor.

In a delta-less harmonic cancellation device that can reduce harmonics even when only one inverter is operated,
A two-winding transformer having a primary winding constituted by a star connection and a secondary winding constituted by a delta connection, connected to a wiring connected to the system power supply;
A second inverter that is connected to the wiring connected to the secondary winding and includes a second inverter three-phase full-wave rectifier circuit and a second capacitor;
A first three-phase full-wave rectifier circuit connected to the primary winding side connection wiring connected to the system power supply;
The first three-phase full-wave rectifier circuit is connected to the wiring connecting the second inverter, and the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter are electrically connected to each other. A switch part;
A second capacitor voltage detecting device connected to a wiring connecting the first three-phase full-wave rectifier circuit and the second inverter, and detecting a voltage of a second capacitor built in the second inverter;
Connected to a wiring connecting the first three-phase full-wave rectifier circuit and the second inverter, and electrically connects and disconnects the first three-phase full-wave rectifier circuit and the second capacitor built in the second inverter. Control means for controlling the opening and closing of the first switch part in order to
The control means closes the first switch when the voltage of the second capacitor detected by the second capacitor voltage detection device reaches or exceeds a predetermined voltage value, and the first three-phase full wave The rectifier circuit is electrically connected to the second capacitor built in the second inverter, and a load abnormality signal is received from the second inverter, so that the first switch part is opened to be built in the second inverter. A delta-less harmonic cancellation device that discharges the electric power charged in the second capacitor.

The delta-less harmonic canceling device according to any one of claims 1 to 4 , wherein a series reactor is connected to the primary winding side connection wiring.