JP2005094966A - Device for checking individual operation detecting function of interconnected inverter - Google Patents

Device for checking individual operation detecting function of interconnected inverter Download PDF

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Publication number
JP2005094966A
JP2005094966A JP2003327335A JP2003327335A JP2005094966A JP 2005094966 A JP2005094966 A JP 2005094966A JP 2003327335 A JP2003327335 A JP 2003327335A JP 2003327335 A JP2003327335 A JP 2003327335A JP 2005094966 A JP2005094966 A JP 2005094966A
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switch
inverter
power supply
detection function
operation detection
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Takeshi Shioda
剛 塩田
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Toyo Electric Manufacturing Ltd
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Toyo Electric Manufacturing Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein a test circuit for checking the individual operation detecting function of an interconnected inverter needs an external power source as an energy source and therefore makes it difficult to simplify the test circuit and to perform a test at low cost because of the cost of borrowing the external power supply. <P>SOLUTION: This device for checking the individual operation detecting function of the interconnected inverter is constituted of: a first switch that inputs a system power supply; a second switch and a step-up transformer that are connected in parallel to the output end of the first switch; an induction motor connected to the output end of the second switch; a rectifier that is connected to the secondary side of the step-up transformer; and a mean that outputs a DC voltage command to the interconnected inverter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、系統に連係される系統連係インバータの単独運転検出機能が、正常に働くかを確認するための試験装置に係り、特に、持ち運びに便利であり、操作の容易な系統連係インバータの単独運転検出機能確認装置に関するものである。   The present invention relates to a test apparatus for confirming whether the islanding operation detection function of a system linkage inverter linked to a system works normally. In particular, the present invention relates to a system linkage inverter that is convenient to carry and easy to operate. The present invention relates to an operation detection function confirmation device.

本出願人は先に、について特開2003−209931号の「系統連係インバータの単独運転検出装置及びその制御方法」にて提案している(特許文献1)。
そして従来は、系統連係インバータの単独運転検出機能を確認するために、下記に記述するような方法で行っていた。
The present applicant has previously proposed in Japanese Patent Application Laid-Open No. 2003-209931, “Single operation detection device for system-linked inverter and control method thereof” (Patent Document 1).
Conventionally, in order to confirm the islanding operation detection function of the grid-linked inverter, the following method is used.

従来の系統連係インバータの単独運転検出機能を確認するための装置を、図2の従来の系統連係インバータの単独運転検出機能を確認するための試験接続図を参照して詳述する。
図2において、1は系統電源、2は系統スイッチ、3は誘導電動機、4は外部直流電源、10は系統連係インバータ、11は直流コンデンサー、12はPWM変換器、13はフイルター、14は連係スイッチである。
系統連係インバータ10は、外部直流電源4よりエネルギーを入力し、直流コンデンサー11およびPWM変換器12により直流を交流に変換して、フイルター13、連係スイッチ14を経て系統スイッチ2の出力側に接続される。
系統スイッチ2の入力側は系統電源1に接続される。系統スイッチ2の出力側には、連係スイッチ14と並列に誘導電動機3が接続される。
An apparatus for confirming the isolated operation detection function of the conventional grid-linked inverter will be described in detail with reference to a test connection diagram for confirming the isolated operation detection function of the conventional grid-linked inverter of FIG.
In FIG. 2, 1 is a system power supply, 2 is a system switch, 3 is an induction motor, 4 is an external DC power supply, 10 is a system linkage inverter, 11 is a DC capacitor, 12 is a PWM converter, 13 is a filter, and 14 is a linkage switch. It is.
The system linkage inverter 10 receives energy from the external DC power supply 4, converts DC to AC by the DC capacitor 11 and the PWM converter 12, and is connected to the output side of the system switch 2 through the filter 13 and the linkage switch 14. The
The input side of the system switch 2 is connected to the system power supply 1. The induction motor 3 is connected to the output side of the system switch 2 in parallel with the linkage switch 14.

このように接続される系統連係インバータ10は、直流出力を発生する外部電源装置4よりエネルギーを得て、交流を系統に出力する。
系統連係インバータ10の単独運転検出機能を確認する時に、条件の一番厳しい状態は、残留磁気により継続運転がし易い誘導電動機3の消費電力が系統連係インバータ10から供給されているとき、すなわち系統スイッチ2から流れ出る図2に示す電流Isが零のときであり、この状態では系統スイッチ2の遮断により系統連係インバータ10の出力電圧・電流が変化し難いためである。
従って、単独運転検出機能を確認するときは、外部電源装置4の出力を調整して、系統スイッチ2から流れ出る図2に示す電流Isを零にし、系統スイッチ2を遮断したときに系統連係インバータが単独運転検出機能により連係スイッチ14を遮断するかの確認を行う。
特開2003−209931号(図1)
The system linkage inverter 10 connected in this way obtains energy from the external power supply device 4 that generates a DC output, and outputs AC to the system.
When confirming the islanding operation detection function of the grid-linked inverter 10, the most severe condition is when the power consumption of the induction motor 3 that is easily operated continuously is supplied from the grid-linked inverter 10 due to residual magnetism, that is, the grid This is because the current Is shown in FIG. 2 flowing out from the switch 2 is zero, and in this state, the output voltage / current of the system linkage inverter 10 is unlikely to change due to the system switch 2 being cut off.
Therefore, when confirming the islanding detection function, the output of the external power supply device 4 is adjusted so that the current Is shown in FIG. It is confirmed whether the linkage switch 14 is shut off by the isolated operation detection function.
Japanese Patent Laying-Open No. 2003-209931 (FIG. 1)

このように構成される系統連係インバータの単独運転検出機能を確認する試験回路においては、エネルギー源としての外部電源装置4が必要なために、試験回路を簡便にし難く、しかも外部電源装置4を借用する費用等が発生するので、安価に構成することが難しかった。
また僻地に設置される風力発電設備に接続される系統連係インバータの場合には、外部電源装置4を風力発電設備に頼っても、風のエネルギーが気まぐれであるために、図2に示す電流Isを零とする状態を実現することが困難であるという問題があった。
In the test circuit for confirming the islanding operation detection function of the grid-linked inverter configured as described above, the external power supply device 4 is required as an energy source. Therefore, it is difficult to simplify the test circuit, and the external power supply device 4 is borrowed. It is difficult to configure at a low cost.
Further, in the case of a grid-linked inverter connected to a wind power generation facility installed in a remote area, even if the external power supply 4 is relied on the wind power generation facility, the wind energy is uncertain, so the current Is shown in FIG. There is a problem that it is difficult to realize a state of zero.

従って、本発明は、図2に示す電流Isを零とする状態を簡便に実現して、前述の課題を解決するために、系統電源1よりエネルギーを入力し、系統連係インバータ10の直流電圧を可変することにより、その目的を達成することを主な特徴とする。 Therefore, in the present invention, in order to easily realize the state in which the current Is shown in FIG. The main feature is to achieve the purpose by making it variable.

本発明の系統連係インバータの単独運転検出機能確認装置においては、別の直流電源装置を用いることなく、系統連係インバータの単独運転検出機能の確認を簡便に行うことができる。
又、この系統連係インバータの単独運転検出機能確認装置の各構成部品は、容量の小さな部品で構成できるので、持ち運べることが可能であり、実用上おおいに有用である。
In the independent operation detection function confirmation device for a grid-linked inverter according to the present invention, the independent operation detection function of the grid-linked inverter can be easily confirmed without using another DC power supply device.
Further, each component of the independent operation detection function confirmation device for the grid-linked inverter can be configured with a small capacity component, so that it can be carried and is extremely useful in practice.

本発明の系統連係インバータの単独運転検出機能確認装置は、系統電源を入力する第1のスイッチと、該第1のスイッチの出力端に並列に接続される第2のスイッチおよび昇圧トランスと、該第2のスイッチの出力端に接続される誘導電動機と、前記昇圧トランスの2次側に接続される整流器と、前記系統連係インバータへ直流電圧指令を出力する手段により構成することを最良の形態とするものである。   An independent operation detection function confirmation device for a grid-linked inverter according to the present invention includes a first switch for inputting a system power supply, a second switch and a step-up transformer connected in parallel to the output terminal of the first switch, The best mode is constituted by an induction motor connected to the output terminal of the second switch, a rectifier connected to the secondary side of the step-up transformer, and a means for outputting a DC voltage command to the system linkage inverter. To do.

図1は、本発明の1実施例であり、系統連係インバータの単独運転検出機能確認装置を接続した系統連係インバータの確認試験回路図である。
同図において、20は系統連係インバータの単独運転検出機能確認装置、21は第1のスイッチ、22は第2のスイッチ、23は昇圧トランス、24は整流器、25は直流電圧指令発生器であり、構成部品21〜25により系統連係インバータの単独運転検出機能確認装置20を構成し、図2と同一番号は同一構成部品を表す。
以下、図1について説明する。
FIG. 1 is an embodiment of the present invention, and is a confirmation test circuit diagram of a grid-linked inverter connected to a system-linked inverter isolated operation detection function confirmation device.
In the same figure, 20 is a system operation inverter independent operation detection function confirmation device, 21 is a first switch, 22 is a second switch, 23 is a step-up transformer, 24 is a rectifier, 25 is a DC voltage command generator, The component parts 21 to 25 constitute the independent operation detection function confirmation device 20 for the grid-linked inverter, and the same numbers as those in FIG. 2 represent the same component parts.
Hereinafter, FIG. 1 will be described.

系統連係インバータの単独運転検出機能確認装置20の第1のスイッチ21は、系統電源1に接続されて交流電源を入力する。第1のスイッチ21の出力は、第2のスイッチ22および昇圧トランス23に並列に接続される。昇圧トランス23の2次側は、整流器24に接続され、その直流出力は系統連係インバータ10の直流部に接続される。第2のスイッチ22の出力は、誘導電動機3および系統連係インバータ10の連係スイッチ14に並列に接続される。直流電圧指令発生器25は、直流電圧指令Vdc*を系統連係インバータ10のPWM変換器12に出力する。 The 1st switch 21 of the independent operation detection function confirmation apparatus 20 of a system linkage inverter is connected to the system power supply 1, and inputs alternating current power. The output of the first switch 21 is connected to the second switch 22 and the step-up transformer 23 in parallel. The secondary side of the step-up transformer 23 is connected to the rectifier 24, and its DC output is connected to the DC section of the system linkage inverter 10. The output of the second switch 22 is connected in parallel to the induction motor 3 and the linkage switch 14 of the system linkage inverter 10. The DC voltage command generator 25 outputs the DC voltage command Vdc * to the PWM converter 12 of the system linkage inverter 10.

次ぎにその作用について説明する。
第1のスイッチ21より入力した電力は、昇圧トランス23により昇圧されて整流器24により系統連係インバータ10の直流部に供給される。系統連係インバータ10のPWM変換器12は、直流電力を交流電力に変えて、連係スイッチ14を経て誘導電動機3、および第2のスイッチ22を経て系統電源1に還流させる。
ここで昇圧トランス23が系統電源1の電圧を昇圧している理由は、系統連係インバータ10の直流電圧Vdcを高めにして、系統連係インバータ10の出力を正弦波状にし易くするためである。
Next, the operation will be described.
The electric power input from the first switch 21 is boosted by the step-up transformer 23 and is supplied to the DC portion of the system linkage inverter 10 by the rectifier 24. The PWM converter 12 of the system linkage inverter 10 changes the DC power to the AC power and returns it to the system power supply 1 via the linkage switch 14 and the induction motor 3 and the second switch 22.
The reason why the step-up transformer 23 boosts the voltage of the system power supply 1 is to increase the DC voltage Vdc of the system linkage inverter 10 so that the output of the system linkage inverter 10 can be easily made sinusoidal.

このような状態で、直流電圧指令発生器25の直流電圧指令Vdc*を可変することにより、誘導電動機3および系統電源1に還流させる電力を可変できるので、図1に示す電流Isを零にすることができる。
ここで直流電圧指令Vdc*を可変する理由は、系統電源1の電圧には許容範囲が存在するためであり、系統電源1の電圧が高ければ高く、系統電源1の電圧が低ければ低く設定することにより、図1に示す電流Isを零にすることができる。
さらに、図1に示す電流Isを零にする操作の初期段階で、直流電圧指令Vdc*を高めに設定しておいてから可変するようにすれば、大きな電流を流さないようにできるので、系統連係インバータの単独運転検出機能確認装置の各構成部品を小さい容量で構成することができる。
In such a state, by changing the DC voltage command Vdc * of the DC voltage command generator 25, the electric power to be returned to the induction motor 3 and the system power supply 1 can be changed, so that the current Is shown in FIG. be able to.
Here, the reason why the DC voltage command Vdc * is varied is that there is an allowable range for the voltage of the system power supply 1. The voltage is set to be higher if the voltage of the system power supply 1 is higher and lower if the voltage of the system power supply 1 is lower. Thus, the current Is shown in FIG. 1 can be made zero.
Further, if the DC voltage command Vdc * is set to a high value at the initial stage of the operation for reducing the current Is shown in FIG. 1 to zero, a large current can be prevented from flowing. Each component of the independent operation detection function confirmation device for the linked inverter can be configured with a small capacity.

従って、図1に示す電流Isを零にした状態で、第2のスイッチ22を開放することは、図2における系統スイッチ2を遮断することと同じであり、系統連係インバータ10の単独運転検出機能の確認を行うことができる。   Therefore, opening the second switch 22 in the state where the current Is shown in FIG. 1 is zero is the same as turning off the system switch 2 in FIG. Can be confirmed.

以上、本発明の実施例では、誘導電動機3を負荷とする場合で説明したが、より簡便には抵抗負荷を用いても良い。   As described above, in the embodiment of the present invention, the case where the induction motor 3 is a load has been described, but a resistance load may be used more simply.

本発明の、系統連係インバータの単独運転検出機能確認装置を説明するための接続図である。(実施例1)It is a connection diagram for demonstrating the independent operation detection function confirmation apparatus of a grid connection inverter of this invention. (Example 1) 従来の系統連係インバータの単独運転検出機能を確認するための試験接続図である。It is a test connection diagram for confirming the isolated operation detection function of the conventional grid-linked inverter.

符号の説明Explanation of symbols

1 系統電源
2 系統スイッチ
3 誘導電動機
4 直流電源装置
10 系統連係インバータ
11 直流コンデンサー
12 PWM変換器
13 フイルター
14 連係スイッチ
20 系統連係インバータの単独運転検出機能確認装置
21 第1のスイッチ
22 第2のスイッチ
23 昇圧トランス
24 整流器
25 直流電圧指令発生器
1 system power supply 2 system switch 3 induction motor 4 DC power supply device 10 system linkage inverter 11 DC capacitor 12 PWM converter 13 filter 14 linkage switch 20 independent operation detection function confirmation device 21 of system linkage inverter 21 first switch 22 second switch 23 Step-up transformer 24 Rectifier 25 DC voltage command generator

Claims (1)

系統連係インバータの単独運転検出機能確認装置において、系統電源を入力する第1のスイッチと、該第1のスイッチの出力端に並列に接続される第2のスイッチおよび昇圧トランスと、該第2のスイッチの出力端に接続される誘導電動機と、前記昇圧トランスの2次側に接続される整流器と、前記系統連係インバータへ直流電圧指令を出力する手段により構成することを特徴とする系統連係インバータの単独運転検出機能確認装置。 In the independent operation detection function confirmation device for the grid-linked inverter, the first switch for inputting the system power, the second switch and the step-up transformer connected in parallel to the output terminal of the first switch, and the second switch An induction motor connected to the output terminal of the switch, a rectifier connected to the secondary side of the step-up transformer, and means for outputting a DC voltage command to the system linkage inverter, Single operation detection function confirmation device.
JP2003327335A 2003-09-19 2003-09-19 Device for checking individual operation detecting function of interconnected inverter Pending JP2005094966A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005210864A (en) * 2004-01-26 2005-08-04 Toyo Electric Mfg Co Ltd Device for checking interconnection protection function of interconnection inverter
JP2007236101A (en) * 2006-03-01 2007-09-13 Tokyo Gas Co Ltd Test apparatus and test method of independent operation detector
JP2011147243A (en) * 2010-01-13 2011-07-28 Ntt Facilities Inc Testing device for dc power supplies

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005210864A (en) * 2004-01-26 2005-08-04 Toyo Electric Mfg Co Ltd Device for checking interconnection protection function of interconnection inverter
JP4562399B2 (en) * 2004-01-26 2010-10-13 東洋電機製造株式会社 System protection function confirmation device for system interconnection inverter
JP2007236101A (en) * 2006-03-01 2007-09-13 Tokyo Gas Co Ltd Test apparatus and test method of independent operation detector
JP4666507B2 (en) * 2006-03-01 2011-04-06 東京瓦斯株式会社 Test apparatus and test method for isolated operation detection device
JP2011147243A (en) * 2010-01-13 2011-07-28 Ntt Facilities Inc Testing device for dc power supplies

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