JP7136568B2 - Three-phase AC power supply system, control method for three-phase AC power supply system, and control program for three-phase AC power supply system - Google Patents

Three-phase AC power supply system, control method for three-phase AC power supply system, and control program for three-phase AC power supply system Download PDF

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JP7136568B2
JP7136568B2 JP2018039906A JP2018039906A JP7136568B2 JP 7136568 B2 JP7136568 B2 JP 7136568B2 JP 2018039906 A JP2018039906 A JP 2018039906A JP 2018039906 A JP2018039906 A JP 2018039906A JP 7136568 B2 JP7136568 B2 JP 7136568B2
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信吾 渡邊
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、三相交流給電システムおよび三相交流給電システムの制御方法に関する。 The present invention relates to a three-phase AC power supply system and a control method for the three-phase AC power supply system.

三相交流には、単相交流より電力の輸送効率や利用効率がよいなどのメリットがある。近年の電源システムでは、使用する電力の増加に対応して、単相交流ではなく三相交流を用いることが多くなっている。上記のメリットがある三相交流であるが、複数の交流電力（例えば、ＡＣ２００Ｖ）受電で動作するシステムの場合、複数のユニットを組み合わせた結果、三相の電流バランスが不平衡となってしまう事が有る。 Three-phase alternating current has advantages such as better power transport and utilization efficiency than single-phase alternating current. In recent years, power supply systems have increasingly used three-phase alternating current instead of single-phase alternating current in response to an increase in the amount of power used. Three-phase AC has the above advantages, but in the case of a system that operates by receiving multiple AC power (for example, AC200V), as a result of combining multiple units, the three-phase current balance may become unbalanced. There is

このような不平衡を改善するための技術が開発されている。例えば、特許文献１には、複数の受電端子が、接続先の給電線を個々に切り替えられるようにして、各相の電流の不平衡を改善する技術が開示されている。この技術では、受電端子と給電線の間にリレーを配置して、給電線の切り替えを可能としている。さらに、それぞれの相に接続する負荷の組み合わせを最適化したテーブルを予め記憶しておき、接続する機器の組み合わせに応じて、バランスが良くなるような接続の組み合わせを選択可能にしている。 Techniques have been developed to remedy such imbalances. For example, Patent Literature 1 discloses a technique for improving current imbalance in each phase by allowing a plurality of power receiving terminals to individually switch the power supply lines to which they are connected. With this technology, a relay is placed between the power receiving terminal and the power supply line to enable switching of the power supply line. Furthermore, a table that optimizes the combination of loads to be connected to each phase is stored in advance so that a combination of connections that achieves good balance can be selected according to the combination of devices to be connected.

特開平０７－０３１０５８号公報JP-A-07-031058

しかしながら、特許文献１の技術では、接続の切り替えを行う場合は、電源システムを停止しなければならないという問題があった。また、最適化された組み合わせで接続を行っても、各機器の消費電力が動的に変化すると、最適なバランスが保てるとは限らないという問題があった。 However, the technique of Patent Document 1 has a problem that the power supply system must be stopped when the connection is switched. Moreover, even if the connection is made with an optimized combination, there is a problem that the optimum balance cannot always be maintained if the power consumption of each device changes dynamically.

本発明は上記の問題に鑑みてなされたものであり、電源システムを停止することなく商用三相の電流バランスを改善する三相交流給電システムを提供することを目的としている。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-phase AC power supply system that improves the current balance of commercial three-phase currents without stopping the power supply system.

上記の課題を解決するため、本発明の三相交流給電システムでは、ＲとＳの線間、ＳとＴの線間、ＴとＲの線間、それぞれに第１、第２、第３の負荷を接続する。また、ＲとＳの線間、ＳとＴの線間、ＴとＲの線間、それぞれに第１、第２、第３の電流調整手段を接続する。３つの電流調整手段の出力は、連結してインバータに入力し、インバータの交流電圧出力を第４の負荷に入力する。出力電圧制御手段は、Ｒ、Ｓ、Ｔの各給電線の電流をモニタし、各線間に流れる線間電流と平均値とを算出する。そして、この平均値より大きな電流の流れている線間に接続する電流調整手段の出力電流を減少させ、平均値より小さな電流の流れている線間に接続する電流調整手段の出力電流を増加させるように制御する。 In order to solve the above problems, in the three-phase AC power supply system of the present invention, first, second and third Connect load. First, second, and third current adjusting means are connected between the R and S lines, between the S and T lines, and between the T and R lines, respectively. The outputs of the three current regulation means are connected and input to an inverter, and the AC voltage output of the inverter is input to a fourth load. The output voltage control means monitors the currents of the R, S, and T power supply lines, and calculates the line-to-line current flowing between the lines and the average value. Then, the output current of the current adjusting means connected between the lines through which the current larger than the average value flows is decreased, and the output current of the current adjusting means connected between the lines through which the current smaller than the average value flows is increased. to control.

本発明の効果は、電源システムを停止することなく商用三相の電流バランスを改善する三相交流給電システムを提供できることである。 An effect of the present invention is to provide a three-phase AC power supply system that improves the current balance of commercial three-phase without stopping the power supply system.

第１の実施形態の三相交流給電システムを示すブロック図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the three-phase alternating current electric power feeding system of 1st Embodiment. 第２の実施形態の三相交流給電システムを示すブロック図である。It is a block diagram which shows the three-phase alternating current electric power feeding system of 2nd Embodiment. 第２の実施形態の三相交流給電システムの動作を示すフローチャートである。8 is a flow chart showing the operation of the three-phase AC power supply system of the second embodiment; 第２の実施形態の三相交流給電システムの制御動作を示すフローチャートである。8 is a flowchart showing control operations of the three-phase AC power supply system of the second embodiment; 第３の実施形態の三相交流給電システムを示すブロック図である。It is a block diagram which shows the three-phase alternating current electric power feeding system of 3rd Embodiment. 第３の実施形態の三相交流給電システムの動作を示すフローチャートである。It is a flowchart which shows operation|movement of the three-phase alternating current electric power feeding system of 3rd Embodiment. 第３の実施形態の三相交流給電システムの制御動作を示すフローチャートである。It is a flow chart which shows the control action of the three-phase alternating current electric supply system of a 3rd embodiment.

以下、図面を参照しながら、本発明の実施形態を詳細に説明する。但し、以下に述べる実施形態には、本発明を実施するために技術的に好ましい限定がされているが、発明の範囲を以下に限定するものではない。なお各図面の同様の構成要素には同じ番号を付し、説明を省略する場合がある。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the embodiments described below are technically preferable for carrying out the present invention, but the scope of the invention is not limited to the following. In addition, the same number may be attached|subjected to the same component of each drawing, and description may be abbreviate|omitted.

（第１の実施形態）
図１は、第１の実施形態三相交流給電システムを示すブロック図である。三相交流給電システムは、Ｒ相の交流を給電する第１の給電線Ｒと、Ｓ相の交流を給電する第２の給電線Ｓと、Ｔ相の交流を給電する第３の給電線Ｔとを有する。また、第１の電流調整手段２ａと、第２の電流調整手段２ｂと、第３の電流調整手段２ｃとを有する。さらに、インバータＩＮＶと、出力電圧制御手段１と、第1の負荷Ｌ１と、第２の負荷Ｌ２と、第３の負荷Ｌ３と、第４の負荷Ｌ４とを有する。 (First embodiment)
FIG. 1 is a block diagram showing a three-phase AC power supply system according to the first embodiment. A three-phase AC power supply system includes a first power supply line R for supplying R-phase AC, a second power supply line S for supplying S-phase AC, and a third power supply line T for supplying T-phase AC. and It also has a first current adjusting means 2a, a second current adjusting means 2b, and a third current adjusting means 2c. Further, it has an inverter INV, an output voltage control means 1, a first load L1, a second load L2, a third load L3 and a fourth load L4.

第１の負荷Ｌ１は、第１の給電線Ｒと第２の給電線Ｓとの線間に接続されている。第２の負荷Ｌ２は、第２の給電線Ｓと第３の給電線Ｔとの線間に接続されている。第３の負荷Ｌ３は、第３の給電線Ｔと第１の給電線Ｒとの線間に接続されている。 A first load L1 is connected between the first power supply line R and the second power supply line S. As shown in FIG. A second load L2 is connected between the second power supply line S and the third power supply line T. As shown in FIG. A third load L3 is connected between the third power supply line T and the first power supply line R.

第１の電流調整手段２ａは、第１の給電線Ｒと第２の給電線Ｓとの線間に接続されている。第２の電流調整手段２ｂは、第２の給電線Ｓと第３の給電線Ｔとの線間に接続されている。第３の電流調整手段２ｃは、第３の給電線Ｔと第１の給電線Ｒとの線間に接続されている。なお、以降の説明では、インバータＩＮＶを、単にＩＮＶと記すように、各部の名称を符号だけで略記する場合がある。 The first current adjusting means 2a is connected between the first power supply line R and the second power supply line S. As shown in FIG. The second current adjusting means 2b is connected between the lines of the second power supply line S and the third power supply line T. As shown in FIG. The third current adjusting means 2c is connected between the third feed line T and the first feed line R. As shown in FIG. In the following description, the name of each part may be abbreviated with only a symbol, such that the inverter INV is simply described as INV.

３つの電流調整手段２の出力は、例えば連結して、インバータＩＮＶに入力される。ＩＮＶは交流電圧を出力し、その出力は第４の負荷Ｌ４に入力される。 The outputs of the three current adjusting means 2 are connected, for example, and input to the inverter INV. INV outputs an alternating voltage, the output of which is input to the fourth load L4.

出力電圧制御手段１は、Ｒ、Ｓ、Ｔの各給電線の電流を電流モニタＡ１、Ａ２、Ａ３でそれぞれモニタし、各線間に流れる線間電流と３つの線間電流の平均値を算出する。そして、この平均値より大きな電流の流れている線間があれば、当該線間に接続する電流調整手段２の出力電流を減少させるように制御する。一方、この平均値より小さな電流の流れている線間があれば、当該線間に接続する電流調整手段２の出力電流を増加させるように制御する。以上のような、動作により、Ｒ相、Ｓ相、Ｔ相の電流値を均等に近づけていくことができる。 The output voltage control means 1 monitors the currents of the R, S, and T feeder lines with the current monitors A1, A2, and A3, respectively, and calculates the line-to-line current flowing between the lines and the average value of the three line-to-line currents. . If there is a line where a current larger than the average value is flowing, control is performed so as to decrease the output current of the current adjusting means 2 connected between the lines. On the other hand, if there is a line through which a current smaller than the average value is flowing, control is performed so as to increase the output current of the current adjusting means 2 connected between the lines. By the operation as described above, the current values of the R-phase, S-phase, and T-phase can be brought closer to each other.

（第２の実施形態）
本実施形態では、三相交流給電システムの具体的な構成と動作について説明する。図２は、第２の実施形態の三相交流給電システムを示すブロック図である。三相交流給電システムは、Ｒ相の交流を給電する第１の給電線Ｒと、Ｓ相の交流を給電する第２の給電線Ｓと、Ｔ相の交流を給電する第３の給電線Ｔとを有する。また、ＡＣ／ＤＣコンバータa２０ａと、ＡＣ／ＤＣコンバータｂ２０ｂと、ＡＣ／ＤＣコンバータｃ２０ｃとを有する。さらに、インバータ３０と、出力電圧制御手段４０とを有する。そして、ＲとＳの線間Ｒ－Ｓには、ユニットａ１０ａとＡＣ／ＤＣコンバータａ２０ａが並列に接続されている。ＳとＴの線間Ｓ－Ｔには、ユニットｂ１０ｂとＡＣ／ＤＣコンバータｂ２０ｂが並列に接続されている。ＴとＲの線間には、ユニットｃ１０ｃとＡＣ／ＤＣコンバータｃ２０ｃが並列に接続されている。本実施形態では、第１の実施形態の電流調節手段を、ＡＣ／ＤＣコンバータ２０とダイオードｄとの組み合わせにより構成している。ＡＣ／ＤＣコンバータ２０の出力電圧が低下するとダイオードｄに流れる電流は減少し、出力電圧が上昇するとダイオードｄに流れる電流は増加する。なお、上記ではダイオードｄを用いたが、抵抗を用いることも可能である。 (Second embodiment)
In this embodiment, a specific configuration and operation of a three-phase AC power supply system will be described. FIG. 2 is a block diagram showing a three-phase AC power supply system of the second embodiment. A three-phase AC power supply system includes a first power supply line R for supplying R-phase AC, a second power supply line S for supplying S-phase AC, and a third power supply line T for supplying T-phase AC. and It also has an AC/DC converter a 20a, an AC/DC converter b 20b, and an AC/DC converter c 20c. Furthermore, it has an inverter 30 and an output voltage control means 40 . A unit a10a and an AC/DC converter a20a are connected in parallel to the R-S line line RS. A unit b10b and an AC/DC converter b20b are connected in parallel to the line ST between S and T. FIG. A unit c10c and an AC/DC converter c20c are connected in parallel between the T and R lines. In this embodiment, the current adjusting means of the first embodiment is configured by a combination of the AC/DC converter 20 and the diode d. When the output voltage of AC/DC converter 20 decreases, the current flowing through diode d decreases, and when the output voltage increases, the current flowing through diode d increases. Although the diode d is used in the above description, it is also possible to use a resistor.

それぞれのＡＣ／ＤＣコンバータ２０は、交流電圧を直流電圧に変換する。そして、本実施形態のＡＣ／ＤＣコンバータ２０では、出力する直流電圧は、所定の範囲内で、所望の値に調整できるようになっている。出力電圧の調整は、出力電圧制御信号にしたがって実行する。 Each AC/DC converter 20 converts AC voltage to DC voltage. In the AC/DC converter 20 of this embodiment, the DC voltage to be output can be adjusted to a desired value within a predetermined range. Adjustment of the output voltage is performed according to the output voltage control signal.

３つのＡＣ／ＤＣコンバータ、２０ａ、２０ｂ、２０ｃの出力は、ダイオードｄ１、ｄ２、ｄ３を介した後に連結し、インバータ３０に入力する。インバータは交流電圧（例えば実効値２００Ｖ）を出力し、その出力をユニット１０ｄに入力する。なお図２では、各線間に接続するユニット１０を１つずつとしているが、複数であっても良い。 The outputs of the three AC/DC converters 20 a , 20 b , 20 c are coupled after diodes d 1 , d 2 , d 3 and input to inverter 30 . The inverter outputs an alternating voltage (for example, 200 V effective) and inputs the output to the unit 10d. In FIG. 2, one unit 10 is connected between each line, but a plurality of units may be connected.

電流モニタ５０ａ、５０ｂ、５０ｃはＲ、Ｓ、Ｔの各給電線の電流をモニタする。 Current monitors 50a, 50b, 50c monitor the current in the R, S, and T feeder lines.

出力電圧制御部４０は、線間電流計算部４１と、出力電圧制御信号生成部４２とを有する。線間電流計算部４１は、給電線Ｒ、Ｓ、Ｔの電流値から、各線間に流れる線間電流と、３つの線間電流の平均値とを算出する。 The output voltage controller 40 has a line current calculator 41 and an output voltage control signal generator 42 . The line-to-line current calculator 41 calculates the line-to-line current flowing between the lines and the average value of the three line-to-line currents from the current values of the feeder lines R, S, and T.

出力電圧制御信号生成部４２は、算出された線間電流と平均値とを比較して、その差に基づいて、各ＡＣ／ＤＣコンバータの出力電圧を制御する出力電圧制御信号を生成する。そして、出力電圧制御部４０は、生成した出力電圧制御信号４８を、それぞれのＡＣ／ＤＣコンバータに送信して、各ＡＣ／ＤＣコンバータの出力電圧を制御する。 The output voltage control signal generator 42 compares the calculated line current with the average value, and based on the difference, generates an output voltage control signal for controlling the output voltage of each AC/DC converter. The output voltage control unit 40 then transmits the generated output voltage control signal 48 to each AC/DC converter to control the output voltage of each AC/DC converter.

上記の制御において、出力電圧制御信号生成部４２は、平均値より大きな線間電流が流れている線間があれば、当該線間に接続するＡＣ／ＤＣコンバータの出力電圧を低下させるような出力電圧制御信号を生成する。一方、この平均値より小さな線間電流が流れている場合は、当該線間に接続するＡＣ／ＤＣコンバータの出力電圧を上昇させる出力電圧制御信号４８を生成する。 In the above control, the output voltage control signal generator 42, if there is a line-to-line current larger than the average value, outputs such that the output voltage of the AC/DC converter connected between the lines is reduced. Generate a voltage control signal. On the other hand, when a line-to-line current smaller than this average value flows, an output voltage control signal 48 is generated to increase the output voltage of the AC/DC converter connected between the lines.

次に、三相交流給電システムの動作について説明する。図３は、三相交流給電システムの動作を示すフローチャートである。まず、Ｒ相、Ｓ相、Ｔ相の電流値を測定する（ｓｔｅｐ１）。次に、測定した各相の電流値を用いて線間電流と、３つの線間電流の平均値とを計算する（ｓｔｅｐ２）。次に、各線間電流と平均値とに基づいて、ＡＣ／ＤＣコンバータ２０ａの出力電圧を制御する（ｓｔｅｐ３）。 Next, operation of the three-phase AC power supply system will be described. FIG. 3 is a flow chart showing the operation of the three-phase AC power supply system. First, the current values of the R-phase, S-phase, and T-phase are measured (step 1). Next, the measured current value of each phase is used to calculate the line-to-line current and the average value of the three line-to-line currents (step 2). Next, the output voltage of the AC/DC converter 20a is controlled based on each line current and the average value (step 3).

この定義済み処理、ＡＣ／ＤＣコンバータ２０ａの出力電圧を制御、を図４のフローチャートに示す。まず、ＡＣ／ＤＣコンバータ２０ａの入力であるＲ－Ｓ相の線間電流が平均値よりも大きいか判定する（ｓｔｅｐ３１）。平均値よりも大きい場合は（ｓｔｅｐ３１＿Ｙｅｓ）、ＡＣ／ＤＣコンバータ２０ａの出力電圧を低下させる制御を行う（ｓｔｅｐ３２）。一方、Ｒ－Ｓ相の線間電流が平均値より大きくなかった場合は（ｓｔｅｐ２１＿Ｎｏ）、Ｒ－Ｓ相の線間電流が平均値より小さいか判定する（ｓｔｅｐ３３）。Ｒ－Ｓ相の線間電流が平均値より小さい場合は（ｓｔｅｐ３３＿Ｙｅｓ）、ＡＣ／ＤＣコンバータ２０ａの出力電圧を上昇させる制御を行う（ｓｔｅｐ３４）。なお、ｓｔｅｐ３１とｓｔｅｐ３３の順番は逆であっても良い。 This predefined process, controlling the output voltage of the AC/DC converter 20a, is shown in the flow chart of FIG. First, it is determined whether or not the line-to-line current of the RS phase, which is the input of the AC/DC converter 20a, is larger than the average value (step 31). If it is greater than the average value (step 31_Yes), control is performed to lower the output voltage of the AC/DC converter 20a (step 32). On the other hand, if the line-to-line current of the RS phase is not larger than the average value (step 21_No), it is determined whether the line-to-line current of the RS phase is smaller than the average value (step 33). If the line-to-line current of the RS phase is smaller than the average value (step 33_Yes), control is performed to raise the output voltage of the AC/DC converter 20a (step 34). Note that the order of step 31 and step 33 may be reversed.

図３の、Ｓ－Ｔ相に対応するＡＣ／ＤＣコンバータ２０ｂの制御（ｓｔｅｐ４）、Ｔ－Ｒ相に対応するＡＣ／ＤＣコンバータ２０ｃの制御（ｓｔｅｐ５）も、ｓｔｅｐ３と同様にして行う。 Control of the AC/DC converter 20b corresponding to the ST phase (step 4) and control of the AC/DC converter 20c corresponding to the TR phase (step 5) in FIG.

ここで再び図３のフローチャートについて説明する。ｓｔｅｐ３、４、５の処理により、３つの線間電流が平均値に近付くように制御される。そして、ｓｔｅｐ３，４、５の処理が完了したら、ｓｔｅｐ１に戻り、同様の制御を繰り返す。この動作を繰り返すことによって、Ｒ相、Ｓ相、Ｔ相の電流値を均等に近づけることができる。なおｓｔｅｐ３、４、５の順番は、順不同で良い。 Here, the flowchart of FIG. 3 will be described again. By the processing of steps 3, 4, and 5, the three line-to-line currents are controlled so as to approach the average value. Then, when the processing of steps 3, 4, and 5 is completed, the process returns to step 1, and the same control is repeated. By repeating this operation, the current values of the R-phase, S-phase and T-phase can be brought closer to each other. The order of steps 3, 4, and 5 may be random.

以上説明したように、本実施形態によれば、三相交流の各層の電流が均等となるように調整することができる。 As described above, according to the present embodiment, it is possible to adjust the three-phase alternating current in each layer so as to be uniform.

（第３の実施形態）
ＡＣ／ＤＣコンバータには、複数台を同時に使用した時、互いの電流バランスを均等化するための電流バランス回路を備えたものがある。本実施形態では、電流バランス回路を備えたＡＣ／ＤＣコンバータを用いた場合の、三相の均等化方法について説明する。 (Third Embodiment)
Some AC/DC converters have a current balance circuit for equalizing mutual current balance when a plurality of converters are used at the same time. In this embodiment, a three-phase equalization method when using an AC/DC converter having a current balance circuit will be described.

図５は本実施形態の三相交流給電システムを示すブロック図である。なお、Ｒ相、Ｓ相、Ｔ相の線間に直接接続する負荷については、第２の実施形態と同様なため、図示を省略している。 FIG. 5 is a block diagram showing the three-phase AC power supply system of this embodiment. The load directly connected between the R-phase, S-phase, and T-phase lines is the same as in the second embodiment, and is not shown.

３台のＡＣ／ＤＣコンバータ６０ａ、６０ｂ、６０ｃは、それぞれが電流バランス回路６１ａ、６１ｂ、６１ｃを備えている。ＡＣ／ＤＣコンバータ６０ａ、６０ｂ、６０ｃは、それぞれＲ－Ｓ相、Ｓ－Ｔ相、Ｔ－Ｒ相に接続している。それぞれの直流電圧出力は合流してインバータ３０に入力する。 The three AC/DC converters 60a, 60b, 60c respectively include current balance circuits 61a, 61b, 61c. The AC/DC converters 60a, 60b, 60c are connected to the RS phase, ST phase, and TR phase, respectively. The respective DC voltage outputs are combined and input to inverter 30 .

本実施形態の出力信号制御部４０は、線間電流計算部４１と調整信号生成部４３とを備えている。第２の実施形態では、ＡＣ／ＤＣコンバータの出力電圧によって電流を制御したが、本実施形態では、電流バランス回路によって出力電流を制御する。 The output signal controller 40 of this embodiment includes a line current calculator 41 and an adjustment signal generator 43 . In the second embodiment, the current is controlled by the output voltage of the AC/DC converter, but in this embodiment, the current balance circuit controls the output current.

通常の電源の並列使用では、電流バランス信号を用いて、複数のＡＣ／ＤＣコンバータが同一の電流を流すように動作する。一方、本実施形態では、個々のＡＣ／ＤＣコンバータに、独立に調整信号を入力することによって、それぞれのＡＣ／ＤＣコンバータの出力電流を制御する。すなわち、計算された線間電流が平均値よりも大きい線間に接続されたＡＣ／ＤＣコンバータの出力電流を減少させるように制御し、平均値よりも線間電流が小さい線間に接続されたＡＣ／ＤＣコンバータの出力電流を増加させるように制御する。そのために、電流バランス回路６１ａ、６１ｂ、６１ｃは、それぞれが調整信号４９ａ、４９ｂ、４９ｃに応じで、出力電流を増減する。 In normal paralleling of power supplies, a current balancing signal is used to operate multiple AC/DC converters to draw the same current. On the other hand, in this embodiment, the output current of each AC/DC converter is controlled by independently inputting the adjustment signal to each AC/DC converter. That is, control is performed to reduce the output current of the AC/DC converter connected between the lines where the calculated line-to-line current is larger than the average value, Control to increase the output current of the AC/DC converter. Therefore, the current balance circuits 61a, 61b, 61c respectively increase or decrease the output currents according to the adjustment signals 49a, 49b, 49c.

図６は、本実施形態の三相給電システムの動作を示すフローチャートである。まず、Ｒ相、Ｓ相、Ｔ相の電流値を測定する（ｓｔｅｐ１０１）。次に、測定した各相の電流値を用いて線間電流と、３つの線間電流の平均値とを計算する（ｓｔｅｐ１０２）。次に、各線間電流と平均値とに基づいて、ＡＣ／ＤＣコンバータ６０ａの出力電流を制御し（ｓ１０ｔｅｐ３）、ＡＣ／ＤＣコンバータ６０ｂの出力電流を制御し（ｓｔｅｐ１０４）し、ＡＣ／ＤＣコンバータ６０ｃの出力電流を制御する（ｓｔｅｐ１０４）。そして、ｓｔｅｐ１０１に戻る。電流制御の詳細については次項で述べる。 FIG. 6 is a flow chart showing the operation of the three-phase power supply system of this embodiment. First, the current values of the R-phase, S-phase, and T-phase are measured (step 101). Next, using the measured current value of each phase, the line current and the average value of the three line currents are calculated (step 102). Next, based on each line current and the average value, the output current of the AC/DC converter 60a is controlled (s10step3), the output current of the AC/DC converter 60b is controlled (step 104), and the AC/DC converter 60c is controlled (step 104). Then, return to step 101 . The details of current control are described in the next section.

図７は、図６のｓｔｅｐ１０３の定義済み処理を示すフローチャートである。まず、ＡＣ／ＤＣコンバータ６０ａの入力であるＲ－Ｓ相の線間電流が平均値よりも大きいか判定する（ｓｔｅｐ１０３１）。平均値よりも大きい場合は（ｓｔｅｐ１０３１＿Ｙｅｓ）、ＡＣ／ＤＣコンバータ６０ａの出力電流を減少させる制御を行う（ｓｔｅｐ１０３２）。一方、Ｒ－Ｓ相の線間電流が平均値より大きくなかった場合は（ｓｔｅｐ１０３１＿Ｎｏ）、Ｒ－Ｓ相の線間電流が平均値より小さいか判定する（ｓｔｅｐ１０３３）。Ｒ－Ｓ相の線間電流が平均値より小さい場合は（ｓｔｅｐ１０３３＿Ｙｅｓ）、ＡＣ／ＤＣコンバータ６０ａの出力電流を増加させる制御を行う（ｓｔｅｐ１０３４）。なお、ｓｔｅｐ１０３１とｓｔｅｐ１０３３の順番は逆であっても良い。以上の動作によって、Ｒ相、Ｓ相、Ｔ相の電流値を均等に近づけることができる。 FIG. 7 is a flow chart showing the defined processing of step 103 of FIG. First, it is determined whether or not the line-to-line current of the RS phase, which is the input of the AC/DC converter 60a, is larger than the average value (step 1031). If it is greater than the average value (step 1031_Yes), control is performed to decrease the output current of the AC/DC converter 60a (step 1032). On the other hand, if the line-to-line current of the RS phase is not greater than the average value (step 1031_No), it is determined whether the line-to-line current of the RS phase is smaller than the average value (step 1033). If the line-to-line current of the RS phase is smaller than the average value (step 1033_Yes), control is performed to increase the output current of the AC/DC converter 60a (step 1034). Note that the order of step 1031 and step 1033 may be reversed. By the above operation, the current values of the R-phase, S-phase, and T-phase can be brought closer to each other.

以上説明したように、本実施形態によれば、第２の実施形態と同様に、電源システムを停止することなく、三相交流の各層の電流が均等となるように調整することができる。 As described above, according to the present embodiment, like the second embodiment, it is possible to adjust the three-phase alternating current in each layer to be equal without stopping the power supply system.

上述した第１乃至第３の実施形態の処理を、コンピュータに実行させるプログラムおよび該プログラムを格納した記録媒体も本発明の範囲に含む。記録媒体としては、例えば、磁気ディスク、磁気テープ、光ディスク、光磁気ディスク、半導体メモリ、などを用いることができる。 A program for causing a computer to execute the processes of the first to third embodiments described above and a recording medium storing the program are also included in the scope of the present invention. Examples of recording media that can be used include magnetic disks, magnetic tapes, optical disks, magneto-optical disks, and semiconductor memories.

以上、上述した実施形態を模範的な例として本発明を説明した。しかしながら、本発明は、上記実施形態には限定されない。即ち、本発明は、本発明のスコープ内において、当業者が理解し得る様々な態様を適用することができる。 The present invention has been described above using the above-described embodiments as exemplary examples. However, the invention is not limited to the above embodiments. That is, within the scope of the present invention, various aspects that can be understood by those skilled in the art can be applied to the present invention.

１ 出力電圧制御手段
２ 電流調整手段
２０ ＡＣ／ＤＣコンバータ
３０ インバータ
４０ 出力電圧制御部 1 Output Voltage Control Means 2 Current Adjustment Means 20 AC/DC Converter 30 Inverter 40 Output Voltage Control Section

Claims (8)

三相交流電圧を供給するための第１の給電線と、第２の給電線と、第３の給電線と、
前記第１の給電線と前記第２の給電線の線間に接続された第１の負荷と、
前記第２の給電線と前記第３の給電線の線間に接続された第２の負荷と、
前記第３の給電線と前記第１の給電線の線間に接続された第３の負荷と、
前記第１の給電線と前記第２の給電線の線間に接続され、第１の電流バランス回路を備えた第１のＡＣ／ＤＣコンバータを有する第１の電流調整手段と、
前記第２の給電線と前記第３の給電線の線間に接続され、第２の電流バランス回路を備えた第２のＡＣ／ＤＣコンバータを有する第２の電流調整手段と、
前記第３の給電線と前記第１の給電線の線間に接続され、第３の電流バランス回路を備えた第３のＡＣ／ＤＣコンバータを有する第３の電流調整手段と、
前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とをそれぞれ制御する出力電流制御手段と、
前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とを入力されて交流電圧を出力するインバータと、
前記インバータに接続された第４の負荷と
を有し、
前記出力電流制御手段は、
前記第１の給電線と前記第２の給電線と前記第３の給電線の、３つの線間電流をモニタし、
前記３つの線間電流の平均より大きな電流の流れている線間に接続する電流調整手段の出力電流を減少させ、前記３つの線間電流の平均より小さな電流の流れている給電線に接続する前記電流調整手段の出力電流を増加させるように、前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とを制御する
ことを特徴とする三相交流給電システム。 a first power supply line, a second power supply line, and a third power supply line for supplying a three-phase AC voltage;
a first load connected between the first feed line and the second feed line;
a second load connected between the second feed line and the third feed line;
a third load connected between the third feed line and the first feed line;
a first current adjusting means connected between the lines of the first feed line and the second feed line and having a first AC/DC converter with a first current balancing circuit ;
a second current regulating means connected between the lines of the second power supply line and the third power supply line and having a second AC/DC converter with a second current balancing circuit ;
a third current adjusting means connected between the lines of the third power supply line and the first power supply line and having a third AC/DC converter with a third current balancing circuit ;
output current control means for controlling the output current of the first current adjustment means, the output current of the second current adjustment means, and the output current of the third current adjustment means;
an inverter receiving the output current of the first current adjusting means, the output current of the second current adjusting means, and the output current of the third current adjusting means and outputting an AC voltage;
a fourth load connected to the inverter;
The output current control means is
monitoring three line currents of the first feed line, the second feed line, and the third feed line;
Reduce the output current of the current adjusting means connected between the lines through which a current larger than the average of the three line currents flows, and connect to the feeder line through which a current smaller than the average of the three line currents flows. controlling the output current of the first current adjusting means, the output current of the second current adjusting means, and the output current of the third current adjusting means so as to increase the output current of the current adjusting means; A three-phase AC power supply system characterized by: 前記第１の電流調整手段、前記第２の電流調整手段、前記第３の電流調整手段のそれぞれが、
出力電圧調整機能を備えたＡＣ／ＤＣコンバータと出力側に配置された抵抗素子とを有している
ことを特徴とする請求項１に記載の三相交流給電システム。 each of the first current adjusting means, the second current adjusting means, and the third current adjusting means,
2. The three-phase AC power supply system according to claim 1, further comprising an AC/DC converter having an output voltage adjustment function and a resistive element arranged on the output side. 前記抵抗素子がダイオードである
ことを特徴とする請求項２に記載の三相交流給電システム。 The three-phase AC power supply system according to claim 2, wherein the resistive element is a diode. 三相交流電圧を供給するための第１の給電線と、第２の給電線と、第３の給電線と、を有する三相給電システムの制御方法であって、
第１の負荷を前記第１の給電線と前記第２の給電線の線間に接続し、
第２の負荷を前記第２の給電線と前記第３の給電線の線間に接続し、
第３の負荷を前記第３の給電線と前記第１の給電線の線間に接続し、
第１の電流バランス回路を備えた第１のＡＣ／ＤＣコンバータを有する第１の電流調整手段を前記第１の給電線と前記第２の給電線の線間に接続し、
第２の電流バランス回路を備えた第２のＡＣ／ＤＣコンバータを有する第２の電流調整手段を前記第２の給電線と前記第３の給電線の線間に接続し、
第３の電流バランス回路を備えた第３のＡＣ／ＤＣコンバータを有する第３の電流調整手段を前記第３の給電線と前記第１の給電線の線間に接続し、
前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とをそれぞれ制御し、
前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とをインバータに入力し、
前記インバータの出力を第４の負荷に接続し
前記第１の給電線と前記第２の給電線と前記第３の給電線の、３つの線間電流をモニタし、
前記３つの線間電流の平均より大きな電流の流れている線間に接続する電流調整手段の出力電流を減少させ、前記３つの線間電流の平均より小さな電流の流れている給電線に接続する前記電流調整手段の出力電流を増加させるように、前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とを制御する
ことを特徴とする三相交流給電システムの制御方法。 A control method for a three-phase power supply system having a first power supply line, a second power supply line, and a third power supply line for supplying a three-phase AC voltage, comprising:
connecting a first load between the first feed line and the second feed line;
connecting a second load between the lines of the second feed line and the third feed line;
connecting a third load between the third feeder line and the first feeder line;
connecting a first current adjusting means having a first AC/DC converter with a first current balancing circuit between the lines of the first power supply line and the second power supply line;
connecting a second current regulating means having a second AC/DC converter with a second current balancing circuit between the lines of the second power supply line and the third power supply line;
connecting a third current regulating means having a third AC/DC converter with a third current balancing circuit between the lines of the third power supply line and the first power supply line;
controlling the output current of the first current adjusting means, the output current of the second current adjusting means, and the output current of the third current adjusting means;
inputting the output current of the first current adjusting means, the output current of the second current adjusting means, and the output current of the third current adjusting means into an inverter;
connecting the output of the inverter to a fourth load and monitoring three line currents of the first feed line, the second feed line, and the third feed line;
Reduce the output current of the current adjusting means connected between the lines through which a current larger than the average of the three line currents flows, and connect to the feeder line through which a current smaller than the average of the three line currents flows. controlling the output current of the first current adjusting means, the output current of the second current adjusting means, and the output current of the third current adjusting means so as to increase the output current of the current adjusting means; A control method for a three-phase AC power supply system, characterized by: 前記第１の電流調整手段、前記第２の電流調整手段、前記第３の電流調整手段のそれぞれが、
出力電圧調整機能を備えたＡＣ／ＤＣコンバータと出力側に配置された抵抗素子とを有している
ことを特徴とする請求項４に記載の三相交流給電システムの制御方法。 each of the first current adjusting means, the second current adjusting means, and the third current adjusting means,
5. The method of controlling a three-phase AC power supply system according to claim 4 , further comprising an AC/DC converter having an output voltage adjustment function and a resistive element arranged on the output side. 前記抵抗素子がダイオードである
ことを特徴とする請求項５に記載の三相交流給電システムの制御方法。 The method of controlling a three-phase AC power supply system according to claim 5 , wherein the resistive element is a diode. 三相交流電圧を供給するための第１の給電線と、第２の給電線と、第３の給電線と、
前記第１の給電線と前記第２の給電線の線間に接続された第１の負荷と、
前記第２の給電線と前記第３の給電線の線間に接続された第２の負荷と、
前記第３の給電線と前記第１の給電線の線間に接続された第３の負荷と、
前記第１の給電線と前記第２の給電線の線間に接続され、第１の電流バランス回路を備えた第１のＡＣ／ＤＣコンバータを有する第１の電流調整手段と、
前記第２の給電線と前記第３の給電線の線間に接続され、第２の電流バランス回路を備えた第２のＡＣ／ＤＣコンバータを有する第２の電流調整手段と、
前記第３の給電線と前記第１の給電線の線間に接続され、第３の電流バランス回路を備えた第３のＡＣ／ＤＣコンバータを有する第３の電流調整手段と、
前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とをそれぞれ制御する出力電流制御手段と、
前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とを入力されて交流電圧を出力するインバータと、
前記インバータに接続された第４の負荷と
を有する三相交流制御システムの制御プログラムであって、
前記第１の給電線と前記第２の給電線と前記第３の給電線の、３つの線間電流をモニタするステップと、
前記３つの線間電流の平均より大きな電流の流れている線間に接続する電流調整手段の出力電流を減少させ、前記３つの線間電流の平均より小さな電流の流れている給電線に接続する前記電流調整手段の出力電流を増加させるように、前記第１の電流調整手段の出力電流と、前記第２の電流調整手段の出力電流と、前記第３の電流調整手段の出力電流とを制御するステップと
を有することを特徴とする三相交流給電システムの制御プログラム。 a first power supply line, a second power supply line, and a third power supply line for supplying a three-phase AC voltage;
a first load connected between the first feed line and the second feed line;
a second load connected between the second feed line and the third feed line;
a third load connected between the third feed line and the first feed line;
a first current adjusting means connected between the lines of the first feed line and the second feed line and having a first AC/DC converter with a first current balancing circuit ;
a second current regulating means connected between the lines of the second power supply line and the third power supply line and having a second AC/DC converter with a second current balancing circuit ;
a third current adjusting means connected between the lines of the third power supply line and the first power supply line and having a third AC/DC converter with a third current balancing circuit ;
output current control means for controlling the output current of the first current adjustment means, the output current of the second current adjustment means, and the output current of the third current adjustment means;
an inverter receiving the output current of the first current adjusting means, the output current of the second current adjusting means, and the output current of the third current adjusting means and outputting an AC voltage;
A control program for a three-phase AC control system having a fourth load connected to the inverter,
monitoring three line currents of the first feed line, the second feed line and the third feed line;
Reduce the output current of the current adjusting means connected between the lines through which a current larger than the average of the three line currents flows, and connect to the feeder line through which a current smaller than the average of the three line currents flows. controlling the output current of the first current adjusting means, the output current of the second current adjusting means, and the output current of the third current adjusting means so as to increase the output current of the current adjusting means; A control program for a three-phase AC power supply system, comprising: 前記第１の電流調整手段、前記第２の電流調整手段、前記第３の電流調整手段のそれぞれが、
出力電圧調整機能を備えたＡＣ／ＤＣコンバータと出力側に配置された抵抗素子とを有している
ことを特徴とする請求項７に記載の三相交流給電システムの制御プログラム。 each of the first current adjusting means, the second current adjusting means, and the third current adjusting means,
The control program for a three-phase AC power supply system according to claim 7 , comprising an AC/DC converter having an output voltage adjustment function and a resistive element arranged on the output side.
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