JP6863268B2 - Different voltage motor drive system - Google Patents

Different voltage motor drive system Download PDF

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JP6863268B2
JP6863268B2 JP2017246396A JP2017246396A JP6863268B2 JP 6863268 B2 JP6863268 B2 JP 6863268B2 JP 2017246396 A JP2017246396 A JP 2017246396A JP 2017246396 A JP2017246396 A JP 2017246396A JP 6863268 B2 JP6863268 B2 JP 6863268B2
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翔悟 大泊
翔悟 大泊
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Toshiba Mitsubishi Electric Industrial Systems Corp
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本発明は、１つの電圧型インバータで複数の異なる定格電圧の電動機を駆動する異電圧電動機駆動システムに関する。 The present invention relates to a different voltage motor drive system in which one voltage type inverter drives a plurality of motors having different rated voltages.

図３は、従来使用されている異電圧電動機駆動システムの構成を示す図である。異電圧電動機駆動システムは、１つの電圧型インバータで複数の異なる定格電圧の電動機を駆動するシステムである。 FIG. 3 is a diagram showing a configuration of a conventionally used different-voltage electric motor drive system. The different voltage electric motor drive system is a system for driving a plurality of electric motors having different rated voltages with one voltage type inverter.

図３に示すシステムでは、定格電圧６．６ｋＶの電圧型インバータ１０を用いて、定格電圧３．３ｋＶの低電圧電動機１と定格電圧６．６ｋＶの高電圧電動機２とが駆動される。電圧型インバータ１０は、入力変圧器２０と多数のセルインバータ１１とを内蔵している。入力変圧器２０は、上位遮断器３を介して定格電圧６．６ｋＶの電力系統１００に接続されている。電圧型インバータ１０と接続するインバータを、低電圧電動機１と高電圧電動機２とで切り替えるため、電圧型インバータ１０と各電圧電動機１，２との間には、それぞれ切替遮断器４，５が設けられている。さらに、電圧型インバータ１０の出力電圧は６．６ｋＶにしか対応していないため、電圧型インバータ１０と低電圧電動機１との間には、出力電圧を６．６ｋＶから３．３ｋＶに変圧する出力変圧器６が設けられている。 In the system shown in FIG. 3, a voltage type inverter 10 having a rated voltage of 6.6 kV is used to drive a low voltage electric motor 1 having a rated voltage of 3.3 kV and a high voltage electric motor 2 having a rated voltage of 6.6 kV. The voltage type inverter 10 contains an input transformer 20 and a large number of cell inverters 11. The input transformer 20 is connected to the power system 100 having a rated voltage of 6.6 kV via the upper circuit breaker 3. In order to switch the inverter connected to the voltage type inverter 10 between the low voltage motor 1 and the high voltage motor 2, switching breakers 4 and 5 are provided between the voltage type inverter 10 and the voltage motors 1 and 2, respectively. Has been done. Further, since the output voltage of the voltage type inverter 10 corresponds only to 6.6 kV, the output that transforms the output voltage from 6.6 kV to 3.3 kV between the voltage type inverter 10 and the low voltage motor 1 is output. A transformer 6 is provided.

上記のように、従来使用されている異電圧電動機駆動システムでは、電圧型インバータの出力電圧と異なる定格電圧の電動機を駆動するには出力変圧器を必要とする。出力変圧器を必要とすることでシステム全体が高コスト化し、また、システムの構成機器数が増えることでシステム全体の信頼性は低下する。しかも、この出力変圧器は、電圧型インバータの高調波電圧を受けるために直流偏磁対策を考慮した変圧器とする必要が有り、通常の変圧器よりもサイズやコストが大きいという問題もあった。 As described above, in the conventionally used different voltage electric motor drive system, an output transformer is required to drive an electric motor having a rated voltage different from the output voltage of the voltage type inverter. The need for an output transformer increases the cost of the entire system, and the increase in the number of components of the system reduces the reliability of the entire system. Moreover, this output transformer needs to be a transformer that takes measures against DC demagnetization in order to receive the harmonic voltage of the voltage-type inverter, and there is also a problem that the size and cost are larger than those of a normal transformer. ..

なお、下記の特許文献１には、インバータと電源との間に出力電圧可変機能付変圧器を設け、出力電圧可変機能付変圧器によってインバータに供給する２次側電圧を可変にすることが記載されている。しかし、この公報に記載されたシステムは、定格電圧が等しい複数の電動機のそれぞれにインバータを接続し、１台のインバータで１台の電動機を駆動するシステムであって、異電圧電動機駆動システムとは異なる。また、この公報に記載された出力電圧可変機能付変圧器は、二次側巻線のタップを切り替えて二次側電圧を可変にするものであるため、入力変圧器が一体化された電圧型インバータへの適用は困難である。 It should be noted that Patent Document 1 below describes that a transformer with a variable output voltage function is provided between the inverter and the power supply, and the secondary voltage supplied to the inverter is made variable by the transformer with a variable output voltage function. Has been done. However, the system described in this publication is a system in which an inverter is connected to each of a plurality of electric motors having the same rated voltage, and one electric motor is driven by one inverter. different. Further, since the transformer with a variable output voltage function described in this publication is for switching the tap of the secondary winding to make the secondary voltage variable, it is a voltage type in which the input transformer is integrated. It is difficult to apply to inverters.

特開平１０−１３６５６８号公報Japanese Unexamined Patent Publication No. 10-136568

本発明は、上述のような課題に鑑みてなされたものであり、出力変圧器を用いることなく１つの電圧型インバータで異なる定格電圧の電動機を駆動することができる異電圧電動機駆動システムを提供することを目的とする。 The present invention has been made in view of the above-mentioned problems, and provides a different-voltage motor drive system capable of driving electric motors having different rated voltages with one voltage-type inverter without using an output transformer. The purpose is.

本発明に係る異電圧電動機駆動システムは、定格電圧が異なる複数の電動機と、入力変圧器が一体化された電圧型インバータと、前記入力変圧器の一次巻線において前記複数の電動機のそれぞれの定格電圧に応じた位置に設けられた複数個のタップと、前記電圧型インバータと接続する電動機を前記複数の電動機の間で切り替える電動機切替装置と、電力系統と接続するタップを前記複数のタップの間で切り替えるタップ切替装置とを備えることを特徴とする。前記電動機切替装置による電動機の切り替えと前記タップ切替装置によるタップの切り替えとを連動させてもよい。 The different-voltage motor drive system according to the present invention includes a plurality of electric motors having different rated voltages, a voltage-type inverter in which an input transformer is integrated, and the respective ratings of the plurality of electric motors in the primary winding of the input transformer. A plurality of taps provided at positions according to the voltage, an electric motor switching device that switches the electric motor connected to the voltage type transformer between the plurality of electric motors, and a tap connected to the power system between the plurality of taps. It is characterized by being provided with a tap switching device for switching with. The switching of the electric motor by the electric motor switching device and the switching of the tap by the tap switching device may be linked.

本発明に係る異電圧電動機駆動システムによれば、電圧型インバータと接続する電動機を切り替える際、電力系統と接続するタップを電動機の定格電圧に合ったタップに切り替えることにより、１台の電圧型インバータで出力変圧器を用いずに異なる定格電圧の電動機を切り替えて駆動することができる。また、入力変圧器の一次巻線に設けるタップを増やすことで、駆動可能な電動機の定格電圧の種類を増やすことができる。このため、本発明に係る異電圧電動機駆動システムによれば、出力変圧器分のコストが不要となり、部品点数削減によるシステム信頼性の向上が望める。 According to the different voltage motor drive system according to the present invention, when switching the electric motor connected to the voltage type inverter, one voltage type inverter is obtained by switching the tap connected to the power system to a tap matching the rated voltage of the electric motor. It is possible to switch and drive electric motors with different rated voltages without using an output transformer. Further, by increasing the number of taps provided on the primary winding of the input transformer, the types of rated voltage of the driveable electric motor can be increased. Therefore, according to the different voltage motor drive system according to the present invention, the cost for the output transformer is not required, and the system reliability can be expected to be improved by reducing the number of parts.

本発明の実施の形態に係る異電圧電動機駆動システムの構成を示す図である。It is a figure which shows the structure of the different voltage electric motor drive system which concerns on embodiment of this invention. 図１に示す異電圧電動機駆動システムの入力変圧器の一次巻線結線図である。It is a primary winding connection diagram of the input transformer of the different voltage motor drive system shown in FIG. 従来使用されている異電圧電動機駆動システムの構成を示す図である。It is a figure which shows the structure of the different voltage electric motor drive system used conventionally.

以下、図面を参照して本発明の実施の形態について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の実施の形態に係る異電圧電動機駆動システムの構成を示す図である。本実施の形態に係る異電圧電動機駆動システムは、定格電圧６．６ｋＶの電圧型インバータ１０と、それにより駆動される定格電圧３．３ｋＶの低電圧電動機１及び定格電圧６．６ｋＶの高電圧電動機２とを備える。電圧型インバータ１０は入力変圧器一体型であり、入力変圧器２０と多数のセルインバータ１１とを内蔵している。低電圧電動機１と高電圧電動機２とは、電圧型インバータ１０に並列に接続されている。 FIG. 1 is a diagram showing a configuration of a different voltage electric motor drive system according to an embodiment of the present invention. The different voltage motor drive system according to the present embodiment includes a voltage type inverter 10 having a rated voltage of 6.6 kV, a low voltage motor 1 having a rated voltage of 3.3 kV driven by the voltage inverter 10, and a high voltage motor having a rated voltage of 6.6 kV. 2 and. The voltage type inverter 10 is an integrated input transformer type, and incorporates an input transformer 20 and a large number of cell inverters 11. The low-voltage electric motor 1 and the high-voltage electric motor 2 are connected in parallel to the voltage-type inverter 10.

本実施の形態では、電圧型インバータ１０と、低電圧電動機１及び高電圧電動機２とは、電動機切替装置４０を介して接続されている。電動機切替装置４０は、電圧型インバータ１０と低電圧電動機１との間に設けられた切替遮断器４１と、電圧型インバータ１０と高電圧電動機２との間に設けられた切替遮断器４２とを備える。電動機切替装置４０は、２つの切替遮断器４１，４２の何れか一方を投入しているときには他方を遮断するインターロック機構（図示略）を備えている。本実施の形態では、電圧型インバータ１０と低電圧電動機１との間に出力変圧器は設けられていない。 In the present embodiment, the voltage type inverter 10 and the low voltage electric motor 1 and the high voltage electric motor 2 are connected via the electric motor switching device 40. The electric motor switching device 40 comprises a switching circuit breaker 41 provided between the voltage type inverter 10 and the low voltage electric motor 1 and a switching circuit breaker 42 provided between the voltage type inverter 10 and the high voltage electric motor 2. Be prepared. The electric motor switching device 40 includes an interlock mechanism (not shown) that shuts off one of the two switching circuit breakers 41 and 42 when the other is turned on. In the present embodiment, the output transformer is not provided between the voltage type inverter 10 and the low voltage electric motor 1.

本実施の形態では、電圧型インバータ１０の入力変圧器２０と電力系統１００とを接続するラインは２つ設けられ、それぞれのラインに上位遮断器３１，３２が設けられている。２つの上位遮断器３１，３２はタップ切替装置３０を構成する。タップ切替装置３０は、２つの上位遮断器３１，３２の何れか一方を投入しているときには他方を遮断するインターロック機構（図示略）を備えている。電動機切替装置４０とタップ切替装置３０とは、その切替動作を連動させることができる。 In the present embodiment, two lines connecting the input transformer 20 of the voltage type inverter 10 and the power system 100 are provided, and the upper circuit breakers 31 and 32 are provided in the respective lines. The two upper circuit breakers 31 and 32 constitute a tap changer 30. The tap changer 30 includes an interlock mechanism (not shown) that shuts off one of the two upper circuit breakers 31 and 32 when the other is turned on. The electric motor switching device 40 and the tap switching device 30 can interlock their switching operations.

図２は、入力変圧器２０の一次巻線結線図である。入力変圧器２０は３つの一次巻線２１，２２，２３を備える。各一次巻線２１，２２，２３の中央部付近には高電圧出力用タップ２４，２５，２６が設けられている。上位遮断器３２が投入されたときには、高電圧出力用タップ２４，２５，２６に電力系統１００が接続される。また、各一次巻線２１，２２，２３の端部には低電圧出力用タップ２７，２８，２９が設けられている。上位遮断器３１が投入されたときには、低電圧出力用タップ２７，２８，２９に電力系統１００が接続される。本実施の形態では、高電圧出力用タップ２４，２５，２６に電力系統１００が接続されたときには電圧型インバータ１０の出力電圧は６．６ｋＶとなり、低電圧出力用タップ２７，２８，２９に電力系統１００が接続されたときには電圧型インバータ１０の出力電圧は３．３ｋＶとなるように、入力変圧器２０の巻数比が設計されている。 FIG. 2 is a primary winding connection diagram of the input transformer 20. The input transformer 20 includes three primary windings 21, 22, and 23. High voltage output taps 24, 25, and 26 are provided near the center of each of the primary windings 21, 22, and 23. When the upper circuit breaker 32 is turned on, the power system 100 is connected to the high voltage output taps 24, 25, 26. Further, low voltage output taps 27, 28, and 29 are provided at the ends of the primary windings 21, 22, and 23, respectively. When the upper circuit breaker 31 is turned on, the power system 100 is connected to the low voltage output taps 27, 28, 29. In the present embodiment, when the power system 100 is connected to the high voltage output taps 24, 25, 26, the output voltage of the voltage type inverter 10 becomes 6.6 kV, and the low voltage output taps 27, 28, 29 are powered. The turns ratio of the input transformer 20 is designed so that the output voltage of the voltage type inverter 10 becomes 3.3 kV when the system 100 is connected.

上記の構成によれば、上位遮断器３１を開いて上位遮断器３２を投入し、且つ、切替遮断器４１を開いて切替遮断器４２を投入することで、電圧型インバータ１０から高電圧電動機２へ、その定格電圧である６．６ｋＶの電圧を供給することができる。また、上位遮断器３２開いて上位遮断器３１を投入し、且つ、切替遮断器４２を開いて切替遮断器４１を投入することで、電圧型インバータ１０から低電圧電動機１へ、その定格電圧である３．３ｋＶの電圧を供給することができる。つまり、本実施の形態に係る異電圧電動機駆動システムによれば、出力変圧器を用いることなく、１つの電圧型インバータ１０で異なる定格電圧の電動機１，２を駆動することができる。 According to the above configuration, the upper circuit breaker 31 is opened and the upper circuit breaker 32 is turned on, and the switching circuit breaker 41 is opened and the switching circuit breaker 42 is turned on. A voltage of 6.6 kV, which is the rated voltage, can be supplied to the car. Further, by opening the upper circuit breaker 32 and inserting the upper circuit breaker 31 and opening the switching circuit breaker 42 and inserting the switching circuit breaker 41, the voltage type inverter 10 is transferred to the low voltage electric motor 1 at the rated voltage. A certain 3.3 kV voltage can be supplied. That is, according to the different voltage electric motor drive system according to the present embodiment, one voltage type inverter 10 can drive the electric motors 1 and 2 having different rated voltages without using an output transformer.

なお、電圧型インバータ１０の出力電圧を３．３ｋＶに切り替えた場合、電圧型インバータ１０の内部の直流電圧も半分となる。この場合、不足電圧の保護設定によっては電圧型インバータ１０がトリップすることもある。ゆえに、出力電圧を切り替えるときには、異常と誤判断されないように不足電圧の保護設定を変更することを併せて実施する。 When the output voltage of the voltage type inverter 10 is switched to 3.3 kV, the DC voltage inside the voltage type inverter 10 is also halved. In this case, the voltage type inverter 10 may trip depending on the protection setting of the undervoltage. Therefore, when switching the output voltage, the undervoltage protection setting is also changed so as not to be erroneously determined as an abnormality.

以上、本発明の実施の形態について説明したが、本発明は上記の実施形態に限定されず、本発明の趣旨を逸脱しない範囲において変形して実施することもできる。例えば、入力変圧器２０のタップ位置や電圧型インバータ１０の定格出力電圧を変更する事により、３．３ｋＶや６．６ｋＶだけでなく１０ｋＶや１１ｋＶなどの他の電圧も出力可能となる。また、タップ切替装置は、１つの上位遮断器と、その上位遮断器と接続するタップを高電圧出力用タップと低電圧出力用タップとで切り替える切替器とで構成してもよい。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified and implemented without departing from the spirit of the present invention. For example, by changing the tap position of the input transformer 20 and the rated output voltage of the voltage type inverter 10, not only 3.3 kV and 6.6 kV but also other voltages such as 10 kV and 11 kV can be output. Further, the tap changer may be composed of one upper circuit breaker and a switch that switches the tap connected to the upper circuit breaker between the high voltage output tap and the low voltage output tap.

１ 低電圧電動機
２ 高電圧電動機
３ 上位遮断器
４，５ 切替遮断器
６ 出力変圧器
１０ 電圧型インバータ
１１ セルインバータ
２０ 入力変圧器
２１，２２，２３ 一次巻線
２４，２５，２６ 高電圧出力用タップ
２７，２８，２９ 低電圧出力用タップ
３０ タップ切替装置
３１，３２ 上位遮断器
４０ 電動機切替装置
４１，４２ 切替遮断器
１００ 電力系統 1 Low-voltage electric motor 2 High-voltage electric motor 3 Upper-level breaker 4, 5 Switching breaker 6 Output transformer 10 Voltage-type inverter 11 Cell inverter 20 Input transformer 21, 22, 23 Primary winding 24, 25, 26 For high-voltage output Taps 27, 28, 29 Low voltage output tap 30 Tap switching device 31, 32 Upper circuit breaker 40 Electric motor switching device 41, 42 Switching circuit device 100 Power system

Claims (2)

定格電圧が異なる複数の電動機と、
入力変圧器が一体化された電圧型インバータと、
前記入力変圧器の一次巻線において前記複数の電動機のそれぞれの定格電圧に応じた位置に設けられた複数個のタップと、
前記電圧型インバータと接続する電動機を前記複数の電動機の間で切り替える電動機切替装置と、
電力系統と接続するタップを前記複数のタップの間で切り替えるタップ切替装置と、
を備えることを特徴とする異電圧電動機駆動システム。 With multiple motors with different rated voltages,
A voltage-type inverter with an integrated input transformer and
A plurality of taps provided at positions corresponding to the rated voltages of the plurality of electric motors in the primary winding of the input transformer, and
An electric motor switching device that switches the electric motor connected to the voltage type inverter between the plurality of electric motors, and an electric motor switching device.
A tap changer that switches the taps connected to the power system between the multiple taps, and
A different voltage electric motor drive system characterized by being equipped with. 前記電動機切替装置による電動機の切り替えと前記タップ切替装置によるタップの切り替とは連動していることを特徴とする請求項１に記載の異電圧電動機駆動システム。 The different voltage electric motor drive system according to claim 1, wherein the switching of the electric motor by the electric motor switching device and the switching of the tap by the tap switching device are interlocked with each other.
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