JP5582063B2 - Power converter failure diagnosis method and failure diagnosis apparatus - Google Patents

Power converter failure diagnosis method and failure diagnosis apparatus Download PDF

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JP5582063B2
JP5582063B2 JP2011034990A JP2011034990A JP5582063B2 JP 5582063 B2 JP5582063 B2 JP 5582063B2 JP 2011034990 A JP2011034990 A JP 2011034990A JP 2011034990 A JP2011034990 A JP 2011034990A JP 5582063 B2 JP5582063 B2 JP 5582063B2
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哲平 上山
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Description

本発明は、電力社間で周波数を変換して送電する際に使用されたり、大型モータを駆動する際に電力の周波数を変換したりするために使用される電力変換器の故障診断の技術である。   The present invention is a technique for diagnosing a power converter that is used when power is transmitted between power companies or when a large motor is driven. is there.

従来、電力変換器の異常診断は、変換器の波形分析など、変換器を停止させて模擬出力による解析手法で行うことが一般的であった。
また、変換器の異常による設備トラブルを抑止するため、制御回路を多重化させ、部分的に故障が発生すれば多重化した予備にて運用継続し、故障信号を出力して交換を促すなどの対策が取られてきた（非特許文献１参照）。
また、特許文献１には、コンバータのリアクタの振動を振動計手段で計測し、取得した振動データに基づきコンバータの異常を検知することが記載されている。 Conventionally, abnormality diagnosis of a power converter is generally performed by an analysis method using a simulated output with the converter stopped, such as a waveform analysis of the converter.
In addition, in order to suppress equipment troubles due to converter abnormalities, the control circuit is multiplexed, and if a partial failure occurs, operation is continued with the multiplexed spare, and a fault signal is output to encourage replacement. Measures have been taken (see Non-Patent Document 1).
Patent Document 1 describes that the vibration of a converter reactor is measured by a vibrometer and an abnormality of the converter is detected based on the acquired vibration data.

特開２０１０−７４８７６号公報JP 2010-74876 A

「大容量インバータ制御システムの高信頼化方式」 Ｔ．ＩＥＥ Ｊａｐａｎ，ｖｏｌ．１１１−Ｄ，Ｎｏ．５，’９１“High reliability system for large capacity inverter control system” IEEE Japan, vol. 111-D, no. 5, ’91

従来の変換器の故障診断技術は、制御器の破損による出力信号の変化を検出するため、機器を停止させた上に模擬入力を入れる必要がある。このため、診断のために変換器その他の機器の停止による機会損失が発生するほか、電気回路の離線など工事が発生する。また、電圧印加テストなどで感電しないように気をつけて実施する必要があった。
特許文献１に記載の技術であっても、リアクタに加速度センサを直接取り付ける等して当該リアクタの振動を直接取得する必要があり、工事も必要であった。
本発明は、上記のような点に着目したもので、より簡便に電力変換器の故障診断を可能とすることを目的としている。 The conventional converter fault diagnosis technique detects a change in the output signal due to damage to the controller, so that it is necessary to input a simulated input after stopping the device. For this reason, an opportunity loss due to the stoppage of the converter and other equipment occurs for diagnosis, and construction such as disconnection of the electric circuit occurs. In addition, it was necessary to take care not to get an electric shock in a voltage application test or the like.
Even in the technique described in Patent Document 1, it is necessary to directly acquire vibration of the reactor by attaching an acceleration sensor directly to the reactor, and construction is also required.
The present invention pays attention to the above points, and aims to enable failure diagnosis of a power converter more easily.

上記課題を解決するために、本発明のうち請求項１に記載した発明は、上流側若しくは下流側に変換器用変圧器が配置された電力変換器の故障を診断する電力変換器の故障診断方法であって、
上記変換器用変圧器から発生する騒音の騒音スペクトルに、変換器用変圧器に入出力する電力の周波数である基本周波数の奇数倍のピーク周波数が含まれている場合に、上記電力変換器が故障していると判定することを特徴とする。
次に、請求項２に記載した発明は、請求項１に記載した構成に対し、基本周波数の１０倍以上の周波数であって予め設定したバンド幅の周波数帯に基づき、上記奇数倍調波が含まれているか判定することを特徴とする。 In order to solve the above problems, the invention described in claim 1 of the present invention is a fault diagnosis method for a power converter for diagnosing a fault in a power converter in which a transformer for a converter is arranged upstream or downstream. Because
When the noise spectrum of the noise generated from the converter transformer includes a peak frequency that is an odd multiple of the fundamental frequency, which is the frequency of power input to and output from the converter transformer, the power converter fails. It is characterized by determining that it is.
Next, the invention described in claim 2 is based on the frequency band of the preset bandwidth having a frequency of 10 times or more of the fundamental frequency with respect to the configuration described in claim 1. It is characterized by determining whether it is contained.

次に、請求項３に記載した発明は、上流側若しくは下流側に変換器用変圧器が配置された電力変換器の故障を診断する電力変換器の故障を診断する電力変換器の故障診断装置であって、
上記変換器用変圧器から発生する騒音を集音するマイクと、上記マイクが集音した音を周波数解析して、変換器用変圧器に入出力する電力の周波数である基本周波数の奇数倍のピーク周波数が存在するか否かを判定する異常判定部と、を備えることを特徴とする。
次に、請求項４に記載した発明は、請求項３に記載した構成に対し、上記異常判定部は、基本周波数の１０倍以上の周波数であって予め設定したバンド幅の周波数帯に、上記基本周波数の奇数倍のピーク周波数が存在するか否かを判定することを特徴とする。 Next, the invention described in claim 3 is a failure diagnosis device for a power converter that diagnoses a failure of a power converter that diagnoses a failure of a power converter in which a transformer for a converter is arranged on the upstream side or the downstream side. There,
A microphone that collects noise generated from the converter transformer, and a peak frequency that is an odd multiple of the fundamental frequency, which is the frequency of the power that is input to and output from the converter transformer, by analyzing the frequency of the sound collected by the microphone. And an abnormality determination unit that determines whether or not there exists.
Next, the invention described in claim 4 is the configuration described in claim 3, wherein the abnormality determination unit is configured such that the abnormality determination unit is in a frequency band having a preset bandwidth with a frequency that is 10 times or more the basic frequency. It is characterized by determining whether or not there is a peak frequency that is an odd multiple of the fundamental frequency.

本発明によれば、変換器用変圧器から発する騒音に基づき変換器の異常診断を実施する。すなわち、躯体内の機器に非接触で且つ間接的に変換器の異常を診断できる。
更に、変換器用変圧器から発生する騒音の騒音スペクトルのピーク周波数の周波数によって、変換器の状態を診断するので、簡便に診断が可能となる。
また、請求項２又は請求項４に係る発明によれば、雑音による誤差を低減できるので、より信頼性をもって電力変換器の故障診断が可能となる。 According to the present invention, the abnormality diagnosis of the converter is performed based on the noise emitted from the converter transformer. That is, the abnormality of the converter can be diagnosed indirectly without contact with the equipment in the housing.
Furthermore, since the state of the converter is diagnosed based on the frequency of the peak frequency of the noise spectrum of the noise generated from the transformer for the converter, the diagnosis can be easily performed.
Further, according to the invention according to claim 2 or claim 4, since errors due to noise can be reduced, failure diagnosis of the power converter can be performed more reliably.

電力の送電の例を示す図である。It is a figure which shows the example of electric power transmission. 本発明に基づく実施形態に係る電力変換器の故障診断装置の構成を説明する図である。It is a figure explaining the structure of the failure diagnosis apparatus of the power converter which concerns on embodiment based on this invention. 騒音スペクトルの例を示す図である。It is a figure which shows the example of a noise spectrum. 変圧器の外形を示す図である。It is a figure which shows the external shape of a transformer.

次に、本発明の実施形態について図面を参照しつつ説明する。
（本実施形態の前提）
例えば図１に示すように、発電所１において、所定周波数（図１では６０Ｈｚ）の電力が発電されて送電される。このとき、発電電力を他の周波数の電力系統に送電する際には、直交変換器２Ａ（電力変換器）で他の周波数の電力に変換した後に、他の電力系統に送電される。また、直流で送電する場合には、一度、電力変換器２Ｂで交流を直流に変換し、また電力変換器２Ｃで直流を交流に変換する方式もある。また、各産業設備においても、使用する駆動アクチュエータ３（図１では大型モータ）に応じて、電力変換器２Ｄで適切な周波数に変換した後に、電力を当該駆動アクチュエータに供給する。ここで、図１中、符号４は変圧器をそれぞれ示す。
ここで、電力変換器２は、交流を直流に変換したり、その逆の変換を行ったり、ある周波数を他の周波数に変換したり、ある直流電圧を他の直流電圧に変換する装置である。また、電力変換器２と変換器用変圧器４は、通常、別々に設計されるものである。 Next, embodiments of the present invention will be described with reference to the drawings.
(Premise of this embodiment)
For example, as shown in FIG. 1, at a power plant 1, electric power having a predetermined frequency (60 Hz in FIG. 1) is generated and transmitted. At this time, when the generated power is transmitted to the power system of another frequency, it is transmitted to the other power system after being converted into power of another frequency by the orthogonal converter 2A (power converter). In the case of transmitting power by direct current, there is a method in which alternating current is converted into direct current by the power converter 2B and direct current is converted into alternating current by the power converter 2C. Also in each industrial facility, power is supplied to the drive actuator after being converted into an appropriate frequency by the power converter 2D according to the drive actuator 3 (large motor in FIG. 1) to be used. Here, in FIG. 1, the code | symbol 4 shows a transformer, respectively.
Here, the power converter 2 is a device that converts alternating current into direct current, performs the reverse conversion, converts a certain frequency into another frequency, or converts a certain direct current voltage into another direct current voltage. . Moreover, the power converter 2 and the converter transformer 4 are normally designed separately.

（本実施形態の構成）
次に、本実施形態の電力変換器２の故障診断装置の構成について説明する。
電力変換器２の故障診断装置は、図２に示すように、マイク１０と、異常判定部１２と、報知部１３とを備える。
上記マイク１０は、変圧器４から発生する騒音を集音する装置である。マイク１０は、例えばＡＥセンサから構成する。そして、マイク１０は、集音部を、変換器用変圧器４の躯体の外面に近接若しくは接触するように配置する。 (Configuration of this embodiment)
Next, the configuration of the failure diagnosis device for the power converter 2 of the present embodiment will be described.
As shown in FIG. 2, the failure diagnosis device for the power converter 2 includes a microphone 10, an abnormality determination unit 12, and a notification unit 13.
The microphone 10 is a device that collects noise generated from the transformer 4. The microphone 10 is composed of, for example, an AE sensor. And the microphone 10 arrange | positions a sound collection part so that it may adjoin to or contact the outer surface of the housing of the transformer 4 for converters.

符号１１は、信号を増幅するＡＭＰを示す。
異常判定部１２は、図２に示すように、入力部１２Ａ、周波数解析部１２Ｂ、ピーク値探索部１２Ｃ、及び異常ピーク値検出部１２Ｄを備える。
入力部１２Ａは、上記マイク１０が集音した騒音信号を入力する。また、入力部１２Ａは、不図示の入力装置から基本周波数ＢＳ（系統周波数）を入力して設定する。
周波数解析部１２Ｂは、入力部１２Ａが入力した騒音信号を、周波数解析の処理を実施して騒音スペクトル（周波数スペクトル）を求める。 Reference numeral 11 denotes an AMP that amplifies the signal.
As shown in FIG. 2, the abnormality determination unit 12 includes an input unit 12A, a frequency analysis unit 12B, a peak value search unit 12C, and an abnormal peak value detection unit 12D.
The input unit 12A inputs a noise signal collected by the microphone 10. Further, the input unit 12A inputs and sets a fundamental frequency BS (system frequency) from an input device (not shown).
The frequency analysis unit 12B performs a frequency analysis process on the noise signal input by the input unit 12A to obtain a noise spectrum (frequency spectrum).

ピーク値探索部１２Ｃは、周波数解析部１２Ｂが求めた騒音スペクトルのデータに対し、基本周波数ＢＳの１０倍以上の周波数であって予め設定したバンド幅の周波数帯に存在する、ピーク値を求める。
ここで、通常、電力会社からの電力は、基本周波数ＢＳ（系統周波数）が６０Ｈｚ若しくは５０Ｈｚであるので、その両方の基本周波数ＢＳの１０倍以上の周波数として、６００Ｈｚ以上に設定する。本実施形態では、上記バンド幅の周波数帯として、６００〜７００Ｈｚの帯域を設定しておく。 The peak value search unit 12C obtains a peak value that exists in a frequency band having a preset bandwidth with a frequency that is 10 times or more the fundamental frequency BS with respect to the noise spectrum data obtained by the frequency analysis unit 12B.
Here, since the basic frequency BS (system frequency) is usually 60 Hz or 50 Hz, the power from the electric power company is usually set to 600 Hz or more as a frequency that is 10 times or more of both the basic frequencies BS. In this embodiment, a band of 600 to 700 Hz is set as the frequency band of the above bandwidth.

ピーク値探索部１２Ｃは、まず、上記騒音スペクトルにおける６００Ｈｚから７００Ｈｚまで、予め設定した周波数単位（例えば２Ｈｚ単位）で周波数をずらして、騒音スペクトルのデシベル値を順次、取得する。次に、取得したデジベル値の平均値を平均デシベル値として求める。次に、平均デシベル値の２００％以上の周波数部分をピーク値として検出する。
ピーク値探索部１２Ｃは、上記処理によって、例えば１００Ｈｚ、２００Ｈｚなどの値としてピーク値を検出する。 First, the peak value search unit 12C sequentially acquires a decibel value of the noise spectrum by shifting the frequency in a preset frequency unit (for example, 2 Hz unit) from 600 Hz to 700 Hz in the noise spectrum. Next, an average value of the obtained decibel values is obtained as an average decibel value. Next, a frequency portion of 200% or more of the average decibel value is detected as a peak value.
The peak value search unit 12C detects the peak value as a value of, for example, 100 Hz or 200 Hz by the above process.

異常ピーク値検出部１２Ｄは、上記ピーク値探索部１２Ｃが求めたピーク値に、入力部１２Ａが入力した基本周波数ＢＳの奇数倍の周波数が存在するか否かを判定する。基本周波数ＢＳの奇数倍の周波数が存在する場合には、変換器２が異常と判定して異常フラグをＯＮとする。そうでない場合には、変換器２が異常でないと判定して異常フラグをＯＦＦとする。なお、予め設定した数以上、基本周波数ＢＳの奇数倍の周波数が存在する場合に、変換器２が異常と判定してもよい。   The abnormal peak value detection unit 12D determines whether or not the peak value obtained by the peak value search unit 12C includes a frequency that is an odd multiple of the basic frequency BS input by the input unit 12A. If a frequency that is an odd multiple of the basic frequency BS exists, the converter 2 determines that an abnormality has occurred and sets the abnormality flag to ON. Otherwise, it is determined that the converter 2 is not abnormal and the abnormality flag is turned OFF. Note that the converter 2 may determine that there is an abnormality when there is a frequency that is an odd multiple of the basic frequency BS equal to or greater than a preset number.

また、報知部１３は、異常判定部１２が異常フラグをＯＮつまり変換器２が異常の場合には、その旨を表示や音によって報知する。
なお、上記異常判定部１２や報知部１３の装置を、異常判定する各電圧変換器２から離れたコントローラセンタなどに設けておき、複数の電力変換器２の異常判定を集中して管理するようにしても良い。 In addition, when the abnormality determination unit 12 turns on the abnormality flag, that is, when the converter 2 is abnormal, the notification unit 13 notifies that fact by display or sound.
The devices of the abnormality determination unit 12 and the notification unit 13 are provided in a controller center or the like away from each voltage converter 2 that determines abnormality, and the abnormality determinations of the plurality of power converters 2 are managed in a concentrated manner. Anyway.

（動作その他について）
インバータシステムなどの電圧変換器２の故障のひとつに、素子の信号選択回路のトラブルによるスイッチングタイミングのずれによって発生するものがある。スイッチングがずれ、かつ変換器２が故障検出することなく当該変換器２が停止しなかった場合には、超低周波電圧成分が変換器用変圧器４に流出する。
その超低周波電圧成分が変圧器４に印加される場合、この低周波成分は直流成分と考えられ、直流成分が印加すると、変圧器４の騒音スペクトルが変化する。この変化分を測定することで、変換器２に接続された変換器２のスイッチングずれ故障の判別が可能となる。 (About operation and others)
One of the faults of the voltage converter 2 such as an inverter system is caused by a deviation in switching timing due to a trouble in the signal selection circuit of the element. When the switching is shifted and the converter 2 is not stopped without detecting the failure, the very low frequency voltage component flows out to the converter transformer 4.
When the very low frequency voltage component is applied to the transformer 4, the low frequency component is considered as a direct current component, and when the direct current component is applied, the noise spectrum of the transformer 4 changes. By measuring this change, it is possible to determine the switching error of the converter 2 connected to the converter 2.

ここで、本発明者らは、実験によって、変換器用変圧器４に直流成分を重畳し、直流成分重畳により、変圧器４の騒音スペクトルがどのように変化するか確認した。
すなわち、一般的な商用周波数（基本周波数ＢＳ）下で使用する変圧器４は、変圧器４の鉄心の磁歪振動により、その騒音スペクトルは商用周波数の偶数倍となる。これに対し、直流成分が重畳した変圧器４は、図３に示すように、商用周波数の奇数倍の騒音スペクトルが発生することを確認した。図３中、△は、直流成分がないときのピーク値であり、■は直流成分が存在している場合のピーク値である。 Here, the present inventors have confirmed by experiment that a DC component is superimposed on the transformer for transformer 4 and how the noise spectrum of the transformer 4 changes due to the DC component superposition.
That is, the noise spectrum of the transformer 4 used under a general commercial frequency (basic frequency BS) is an even multiple of the commercial frequency due to the magnetostrictive vibration of the iron core of the transformer 4. On the other hand, it was confirmed that the transformer 4 on which the DC component is superimposed generates a noise spectrum that is an odd multiple of the commercial frequency, as shown in FIG. In FIG. 3, Δ is a peak value when there is no DC component, and ■ is a peak value when a DC component is present.

以上のことから、変圧器４の騒音スペクトルに基本周波数ＢＳの奇数倍のピーク値を検出できれば、その変圧器４に電気的に接続する電力変換器２の異常を検出することが可能となる。
このように、本発明の技術を適用することで、変換器２が簡易に診断可能となり、またオンライン監視システムの構築も可能である。これにより、これまで検出できなかった変換器２の故障も早期に発見できるようになることから、変換器２突発故障による機会損失、変換器２交換コストを低減して、変換器２の部分補修のみで対応が可能となる。 From the above, if a peak value that is an odd multiple of the fundamental frequency BS can be detected in the noise spectrum of the transformer 4, an abnormality of the power converter 2 that is electrically connected to the transformer 4 can be detected.
Thus, by applying the technique of the present invention, the converter 2 can be easily diagnosed, and an online monitoring system can be constructed. As a result, failure of the converter 2 that could not be detected so far can be detected at an early stage. Therefore, the opportunity loss due to the sudden failure of the converter 2 and the replacement cost of the converter 2 are reduced, and partial repair of the converter 2 is performed. It becomes possible to cope with only.

また、図３から分かるように、基本周波数ＢＳの１０倍以上（図３では５００Ｈｚ以上）の周波数帯では、ばらつきが小さくなりノイズによる誤判断を防ぐことが可能となる。周波数帯の上限は特に無いが、周波数解析装置の上限値以下に設定すればよい。ただし、余り高く設定する必要も無いので、例えば基本周波数ＢＳの１００倍以下で設定すればよい。   Further, as can be seen from FIG. 3, in the frequency band of 10 times or more of the fundamental frequency BS (500 Hz or more in FIG. 3), the variation becomes small, and it becomes possible to prevent erroneous judgment due to noise. The upper limit of the frequency band is not particularly limited, but may be set to be equal to or lower than the upper limit value of the frequency analyzer. However, since it is not necessary to set it too high, it may be set at 100 times or less of the fundamental frequency BS, for example.

また、本実施形態の異常判定では、変換器用変圧器４から発する騒音に基づき変換器２の異常診断を実施する。すなわち、非接触で且つ間接的に変換器２の異常を診断できる。
ここで、上記マイク１０による集音について補足説明する。
電力用電圧器は、図４に示すように、鉄心を収容した変圧器本体の躯体４Ａと、その変圧器本体の上方に配置されたコンサベータ２０、変圧器本体内を冷却するラジエータ２１が配置される。符号２２は、ケーブルダクトを示す。 Moreover, in the abnormality determination of this embodiment, the abnormality diagnosis of the converter 2 is implemented based on the noise emitted from the converter transformer 4. That is, the abnormality of the converter 2 can be diagnosed in a non-contact and indirectly manner.
Here, a supplementary description will be given of sound collection by the microphone 10.
As shown in FIG. 4, the power voltage generator includes a transformer body housing 4 </ b> A containing an iron core, a conservator 20 disposed above the transformer body, and a radiator 21 that cools the inside of the transformer body. Is done. Reference numeral 22 denotes a cable duct.

そして、上記マイク１０は、変圧器本体の躯体４Ａ外面に接触などによって配置すればよい。具体的には、マイク１０が内部の鉄心（不図示）に向かうように、またマイク１０で集音する音が大きくなるように、上記躯体外面に沿ってマイク１０を移動させて適切な位置に当該マイク１０を配置する。
また、変圧器４の使用環境の暗騒音（バックグラウンドノイズ）をキャンセル若しくは低減することが、故障診断の信頼性を向上させる点から好ましい。
例えば、変圧器４の外方やラジエータの音を集音する第２のマイク（不図示）を備え、その第２のマイクで拾った音の逆相データを上記マイク１０で集音した音に重畳する。 And the said microphone 10 should just be arrange | positioned by contact etc. to the housing 4A outer surface of a transformer main body. Specifically, the microphone 10 is moved along the outer surface of the housing to an appropriate position so that the microphone 10 is directed to an internal iron core (not shown) and the sound collected by the microphone 10 is increased. The microphone 10 is arranged.
In addition, it is preferable to cancel or reduce background noise in the usage environment of the transformer 4 from the viewpoint of improving the reliability of failure diagnosis.
For example, a second microphone (not shown) that collects the sound of the outside of the transformer 4 and the radiator is provided, and the reverse phase data of the sound picked up by the second microphone is converted into the sound collected by the microphone 10. Superimpose.

１ 発電所
２ 電力変換器
４ 変換器用変圧器
４Ａ 躯体
１０ マイク
１２ 異常判定部
１２Ａ 入力部
１２Ｂ 周波数解析部
１２Ｃ ピーク値探索部
１２Ｄ 異常ピーク値検出部
１３ 報知部
２０ コンサベータ
２１ ラジエータ
ＢＳ 基本周波数
DESCRIPTION OF SYMBOLS 1 Power station 2 Power converter 4 Converter transformer 4A Housing 10 Microphone 12 Abnormality determination part 12A Input part 12B Frequency analysis part 12C Peak value search part 12D Abnormal peak value detection part 13 Notification part 20 Conservator 21 Radiator BS Fundamental frequency

Claims (4)

上流側若しくは下流側に変換器用変圧器が配置された電力変換器の故障を診断する電力変換器の故障診断方法であって、
上記変換器用変圧器から発生する騒音の騒音スペクトルに、変換器用変圧器に入出力する電力の周波数である基本周波数の奇数倍のピーク周波数が含まれている場合に、上記電力変換器が故障していると判定することを特徴とする電力変換器の故障診断方法。 A fault diagnosis method for a power converter for diagnosing a fault in a power converter in which a converter transformer is arranged upstream or downstream,
When the noise spectrum of the noise generated from the converter transformer includes a peak frequency that is an odd multiple of the fundamental frequency, which is the frequency of power input to and output from the converter transformer, the power converter fails. A fault diagnosis method for a power converter, characterized in that it is determined that 基本周波数の１０倍以上の周波数であって予め設定したバンド幅の周波数帯に基づき、上記奇数倍調波が含まれているか判定することを特徴とする請求項１に記載した電力変換器の故障診断方法。   2. The power converter failure according to claim 1, wherein whether or not the odd harmonic is included is determined based on a frequency band having a frequency of 10 times or more of a fundamental frequency and a preset bandwidth. Diagnosis method. 上流側若しくは下流側に変換器用変圧器が配置された電力変換器の故障を診断する電力変換器の故障を診断する電力変換器の故障診断装置であって、
上記変換器用変圧器から発生する騒音を集音するマイクと、
上記マイクが集音した音を周波数解析して、変換器用変圧器に入出力する電力の周波数である基本周波数の奇数倍のピーク周波数が存在するか否かを判定する異常判定部と、
を備えることを特徴とする電力変換器の故障診断装置。 A fault diagnosis device for a power converter that diagnoses a fault of a power converter for diagnosing a fault of a power converter in which a transformer for a converter is arranged on the upstream side or the downstream side,
A microphone that collects noise generated from the transformer for the converter;
Analyzing the frequency of the sound collected by the microphone, and determining whether there is an odd multiple of the fundamental frequency, which is the frequency of the power input to and output from the transformer for the converter,
A fault diagnosis device for a power converter, comprising: 上記異常判定部は、基本周波数の１０倍以上の周波数であって予め設定したバンド幅の周波数帯に、上記基本周波数の奇数倍のピーク周波数が存在するか否かを判定することを特徴とする請求項３に記載した電力変換器の故障診断装置。


The abnormality determining unit determines whether or not a peak frequency that is an odd multiple of the fundamental frequency exists in a frequency band that is a frequency that is 10 times the fundamental frequency or more and has a preset bandwidth. The fault diagnosis device for a power converter according to claim 3.


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