JP2013038917A - Failure diagnosis device, electric power conversion system, and fault diagnosis method - Google Patents

Failure diagnosis device, electric power conversion system, and fault diagnosis method Download PDF

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JP2013038917A
JP2013038917A JP2011173052A JP2011173052A JP2013038917A JP 2013038917 A JP2013038917 A JP 2013038917A JP 2011173052 A JP2011173052 A JP 2011173052A JP 2011173052 A JP2011173052 A JP 2011173052A JP 2013038917 A JP2013038917 A JP 2013038917A
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JP5546507B2 (en
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Yu Kishiwada
優 岸和田
Ippei Takeuchi
一平 竹内
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a failure diagnosis device capable of executing fault diagnosis of an electric power conversion system that has various input power patterns and a plurality of input power.SOLUTION: The failure diagnosis device for diagnosing a fault in an electric power conversion system which converts a plurality of input power for power generation, includes: input power measurement sections 21-1, 21-2 that measure an input power values for each input power; an output power measurement section 23 that measures an output power value of output power; and a fault diagnosis section 22 that determines an estimated value of output power on the basis of a sum total of input power values and power conversion efficiency and diagnoses a fault in the electric power conversion system on the basis of a difference between the output power values and the estimated value.

Description

本発明は、故障診断装置、電力変換装置および故障診断方法に関する。   The present invention relates to a failure diagnosis device, a power conversion device, and a failure diagnosis method.

太陽光発電用パワーコンディショナ（以下、パワコンと略す）においては、太陽電池出力であるＤＣ（Direct current）電源を、一般には系統電源である交流電源に接続することを目的として、太陽電池からの入力については、ＤＣ−ＤＣコンバータによる降圧／昇圧／直結回路等からなる入力を１チャンネル以上備え、系統電源である交流電源へ逆潮流させる為のＡＣインバータを備える。パワコンは、所定の太陽電池入力電圧範囲においては前記ＤＣ−ＤＣコンバータを動作させ、前記ＡＣインバータの入力電源用に、所定の電圧目標に基づいて電圧変換が行われるとともに素子能力を越えないように電流制御されている。またＡＣインバータにおいても、系統電源の電圧と連系するために、ＡＣ電圧制御とともに電流制御を行っている。このように、パワコンでは、系統電源に対し、高効率の電力変換効率とともに安定した電力供給を実現するための構成を有している。   In a power conditioner for photovoltaic power generation (hereinafter abbreviated as power conditioner), a DC (Direct current) power source that is a solar cell output is generally connected to an AC power source that is a system power source. As for the input, one or more channels including a step-down / boost / direct connection circuit or the like by a DC-DC converter are provided, and an AC inverter is provided for reverse power flow to an AC power source as a system power source. The power converter operates the DC-DC converter within a predetermined solar cell input voltage range, and performs voltage conversion based on a predetermined voltage target for the input power source of the AC inverter so as not to exceed the element capability. The current is controlled. Also in the AC inverter, current control is performed together with AC voltage control in order to link with the voltage of the system power supply. Thus, the power conditioner has a configuration for realizing a stable power supply with high power conversion efficiency with respect to the system power supply.

しかし、ＤＣ−ＤＣコンバータ回路においては、接続される太陽電池の設置容量や日射量にともなう電力パターンの変化から、入力される電圧および電流範囲が広範囲に分布する。このため、制御に使用する電圧／電流測定部の正常範囲が大きくなり、自己診断検証が困難であった。また、複数の入力チャンネルを備える場合には、各入力チャンネルの発電パターンが異なることや、パワコンの発電出力開始時点では発電していない入力源も存在している場合もあることや、早朝での日射量が少なく発電電力が少ない起動条件では電流量も少ないこと等により、電流計測系の自己診断検証は困難であった。   However, in the DC-DC converter circuit, the input voltage and current range are distributed over a wide range due to the change in the power pattern according to the installed capacity of the connected solar cells and the amount of solar radiation. For this reason, the normal range of the voltage / current measurement unit used for control becomes large, and self-diagnosis verification is difficult. Also, when multiple input channels are provided, the power generation pattern of each input channel may be different, there may be input sources that are not generating power at the start of power generation output of the power converter, Self-diagnosis verification of the current measurement system was difficult due to the small amount of current, etc. under the startup conditions where the amount of solar radiation was small and the generated power was small.

このような電圧／電流の計測は、一般に制御用コンピュータによりデジタル制御される。このため、各種の電気計測センサーの回路出力はＡ／Ｄ変換器にてデジタル数値化して演算される構成となっており、数値演算により、ＤＣ計測では平均値、ＡＣ計測においては実効値、を求める演算がなされてこれらの演算結果が所定の入力範囲であるか否かを自己検証している。   Such voltage / current measurement is generally digitally controlled by a control computer. For this reason, the circuit output of various electric measurement sensors is configured to be converted into a digital numerical value by an A / D converter, and an average value in DC measurement and an effective value in AC measurement are obtained by numerical calculation. Calculations to be obtained are performed, and it is self-verified whether or not these calculation results are within a predetermined input range.

また、下記特許文献１では、電力変換回路の故障診断において、３相電力変換回路の電流値の各２線の和が０値になる場合は、１回路が断線していると判断する例がのべられており、個々の計測部の異常検出機能では計測値演算結果から故障判定する例が述べられている。   Moreover, in the following patent document 1, in the failure diagnosis of the power conversion circuit, when the sum of each of the two lines of the current value of the three-phase power conversion circuit becomes 0 value, an example of determining that one circuit is disconnected is an example. In the abnormality detection function of each measurement unit, an example in which a failure is determined from the measurement value calculation result is described.

特開２０００−１７５４５４号公報JP 2000-175454 A

上記特許文献１によれば、スイッチング素子が故障状態であるか否かを、検出回路または回路ブロックの入力電流の総和を基準値と比較する方法が述べられている。しかしながら、太陽電池のような各種電力発生パターンをもつパワコンにおいては、判定基準値が広範囲となることから、故障判定基準を設定することが出来ない、という問題があった。   According to Patent Document 1 described above, a method is described in which a sum of input currents of a detection circuit or a circuit block is compared with a reference value as to whether or not a switching element is in a failure state. However, in a power conditioner having various power generation patterns such as a solar battery, there is a problem that a failure criterion cannot be set because a criterion value is wide.

本発明は、上記に鑑みてなされたものであって、太陽光発電用パワーコンディショナ等のように入力される電力パターンが多様でかつ複数の入力電力を有する電力変換装置の故障診断を行うことができる故障診断装置、電力変換装置および故障診断方法を得ることを目的とする。   The present invention has been made in view of the above, and performs failure diagnosis of a power conversion device having a variety of input power patterns and a plurality of input powers, such as a power conditioner for photovoltaic power generation. An object of the present invention is to obtain a failure diagnosis device, a power conversion device, and a failure diagnosis method.

上述した課題を解決し、目的を達成するために、本発明は、複数の入力電力を電力変換して出力電力を生成する電力変換装置の故障を診断する故障診断装置であって、前記入力電力ごとに入力電力値を計測する入力電力計測部と、前記出力電力の出力電力値を計測する出力電力計測部と、前記出力電力値と、前記入力電力値の総和と所定の電力変換効率との乗算結果と、の差が所定の範囲内であるか否かに基づいて前記電力変換装置の故障を診断する、ことを特徴とする。   In order to solve the above-described problems and achieve the object, the present invention provides a failure diagnosis device that diagnoses a failure of a power conversion device that generates output power by converting a plurality of input powers, the input power An input power measurement unit that measures an input power value for each, an output power measurement unit that measures an output power value of the output power, the output power value, a sum of the input power values, and a predetermined power conversion efficiency A failure of the power converter is diagnosed based on whether or not a difference between the multiplication result and the result is within a predetermined range.

本発明によれば、太陽光発電用パワーコンディショナ等のように入力される電力パターンが多様でかつ複数の入力電力を有する電力変換装置の故障診断を行うことができるという効果を奏する。   Advantageous Effects of Invention According to the present invention, there is an effect that failure diagnosis can be performed on a power conversion device having various input power patterns such as a power conditioner for photovoltaic power generation and having a plurality of input powers.

図１は、実施の形態１の電力変換システムの構成例を示す図である。FIG. 1 is a diagram illustrating a configuration example of the power conversion system according to the first embodiment. 図２は、電力変換効率情報の一例を示す図である。FIG. 2 is a diagram illustrating an example of power conversion efficiency information. 図３は、実施の形態１の故障診断処理手順の一例を示すフローチャートである。FIG. 3 is a flowchart illustrating an example of a failure diagnosis processing procedure according to the first embodiment. 図４は、実施の形態２の電力変換システムの構成例を示す図である。FIG. 4 is a diagram illustrating a configuration example of the power conversion system according to the second embodiment.

以下に、本発明にかかる故障診断装置、電力変換装置および故障診断方法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Hereinafter, embodiments of a failure diagnosis device, a power conversion device, and a failure diagnosis method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態１．
図１は、本発明にかかる電力変換システムの実施の形態１の構成例を示す図である。本実施の形態の電力変換システムは、入力装置１−１，１−２と、電力変換装置２と、負荷３と、を備える。本実施の形態の電力変換システムは、例えば太陽光発電用パワーコンディショナ等であり、電力変換の対象となる入力電力の電力発生パターンが多様な場合を想定しているが、電力発生パターンが多様な場合に限定されない。 Embodiment 1 FIG.
1 is a diagram illustrating a configuration example of a first embodiment of a power conversion system according to the present invention. The power conversion system according to the present embodiment includes input devices 1-1 and 1-2, a power conversion device 2, and a load 3. The power conversion system of the present embodiment is, for example, a power conditioner for photovoltaic power generation, and assumes a case where there are various power generation patterns of input power to be converted into power, but there are various power generation patterns. It is not limited to the case.

入力装置１−１，１−２は、例えば太陽電池等のように、直流電力を出力する装置である。電力変換装置２は、入力装置１−１，１−２から入力された直流電力を交流電力に変換して負荷３へ供給する。   The input devices 1-1 and 1-2 are devices that output DC power, such as solar cells. The power converter 2 converts the DC power input from the input devices 1-1 and 1-2 into AC power and supplies the AC power to the load 3.

図１に示すように、電力変換装置２は、入力電力計測部２１−１，２１−２と、故障診断部２２と、出力電力計測部２３と、電力変換部２４と、を備える。入力電力計測部２１−１，２１−２は、それぞれ電流計測部２１１、電圧計測部２１２および演算部２１３を備え、演算部２１３が、電流計測部２１１、電圧計測部２１２の計測結果に基づいて入力電力を求める。出力電力計測部２３も同様に、電流計測部２３１、電圧計測部２３２および演算部２３３を備え、演算部２３３が、電流計測部２３１、電圧計測部２３２の計測結果に基づいて出力電力を求める。   As illustrated in FIG. 1, the power conversion device 2 includes input power measurement units 21-1 and 21-2, a failure diagnosis unit 22, an output power measurement unit 23, and a power conversion unit 24. The input power measurement units 21-1 and 21-2 include a current measurement unit 211, a voltage measurement unit 212, and a calculation unit 213, respectively. The calculation unit 213 is based on the measurement results of the current measurement unit 211 and the voltage measurement unit 212. Find the input power. Similarly, the output power measurement unit 23 includes a current measurement unit 231, a voltage measurement unit 232, and a calculation unit 233, and the calculation unit 233 obtains output power based on the measurement results of the current measurement unit 231 and the voltage measurement unit 232.

入力電力計測部２１−１，２１−２は、それぞれ入力装置１−１，１−２から入力される電力を計測する。具体的には、例えば、入力装置１−１は、入力される電流Ｉｓ＃１および電圧Ｖｓ＃１を計測し、これらに基づいて電力Ｐin＃１を求め、入力装置１−２は、入力電流Ｉｓ＃２および入力電圧Ｖｓ＃２を計測し、これらに基づいて入力電力（入力電力値）Ｐin＃２を求める。電力変換部２４は、入力された直流電力を交流電力に変換して出力する。出力電力計測部２３は、電力変換部２４から出力される出力電力（出力電力値）Ｐｏを計測する。具体的には、例えば、出力される出力電流Ｉｏと出力電圧Ｖｏを計測し、これらに基づいて出力電力Ｐｏを求める。   The input power measuring units 21-1 and 21-2 measure the power input from the input devices 1-1 and 1-2, respectively. Specifically, for example, the input device 1-1 measures the input current Is # 1 and the voltage Vs # 1, obtains the power Pin # 1 based on these, and the input device 1-2 Is # 2 and input voltage Vs # 2 are measured, and based on these, input power (input power value) Pin # 2 is obtained. The power conversion unit 24 converts the input DC power into AC power and outputs the AC power. The output power measurement unit 23 measures the output power (output power value) Po output from the power conversion unit 24. Specifically, for example, the output current Io and the output voltage Vo to be output are measured, and the output power Po is obtained based on these.

入力電力計測部２１−１，２１−２と、故障診断部２２と、出力電力計測部２３と、は、本実施の形態の故障診断装置を構成する。   The input power measuring units 21-1, 21-2, the failure diagnosing unit 22, and the output power measuring unit 23 constitute a failure diagnosing device of the present embodiment.

なお、図１では、入力装置の数を２台としているが、入力装置の数はこれに限定されない。ただし、入力装置の数に応じて電力変換装置２の入力電力計測部を備えることとする。   In FIG. 1, the number of input devices is two, but the number of input devices is not limited to this. However, the input power measuring unit of the power conversion device 2 is provided according to the number of input devices.

次に、本実施の形態の故障診断部２２の動作を説明する。本実施の形態の故障診断部２２は、電力変換装置２の動作モード（例えば、最大電力追従モード、昇圧・降圧動作モードなど）ごとに設定した電力変換効率を電力変換効率情報として保持している。図２は、故障診断部２２が保持している電力変換効率情報の一例を示す図である。このように、動作モードに対応して電力変換効率を設定しておく。また、さらに、電力変換部内のＤＣコンバータの各種モードや発生電力量に応じて電力変換効率を設定してもよい。この場合、例えば、電力変換効率情報として考慮する条件の組み合わせごとに対応して電力変換効率を定めておいてもよいし、入力条件に応じて計算式を用いて電力変換効率が求められるように計算式を定めておいてもよい。   Next, the operation of the failure diagnosis unit 22 of this embodiment will be described. The failure diagnosis unit 22 of the present embodiment holds the power conversion efficiency set for each operation mode (for example, maximum power follow-up mode, step-up / step-down operation mode, etc.) of the power conversion device 2 as power conversion efficiency information. . FIG. 2 is a diagram illustrating an example of the power conversion efficiency information held by the failure diagnosis unit 22. Thus, the power conversion efficiency is set corresponding to the operation mode. Furthermore, the power conversion efficiency may be set according to various modes of the DC converter in the power conversion unit and the amount of generated power. In this case, for example, the power conversion efficiency may be determined for each combination of conditions to be considered as power conversion efficiency information, or the power conversion efficiency may be obtained using a calculation formula according to the input conditions. A calculation formula may be determined.

図３は、本実施の形態の故障診断部２２が実施する故障診断処理手順の一例を示すフローチャートである。故障診断部２２は、故障診断処理が開始されると、まず、その時点での動作モードを取得する（ステップＳ１）。次に、故障診断部２２は、電力変換効率情報を参照して、取得した動作モードに対応する電力変換効率ηを設定する（ステップＳ２）。   FIG. 3 is a flowchart illustrating an example of a failure diagnosis processing procedure performed by the failure diagnosis unit 22 according to the present embodiment. When the failure diagnosis process is started, the failure diagnosis unit 22 first acquires the operation mode at that time (step S1). Next, the failure diagnosis unit 22 refers to the power conversion efficiency information and sets the power conversion efficiency η corresponding to the acquired operation mode (step S2).

故障診断部２２は、入力電力計測部２１−１，２１−２から入力電力Ｐin＃１、Ｐin＃２を取得してこれらの総和としてＰinを求めるとともに、出力電力計測部２３から出力電力Ｐｏを取得する（ステップＳ３）。そして、故障診断部２２は、出力電圧の推定値であるＰin×ηを求め、Ｐｏ＝Ｐin×ηであるか否かを判断する（ステップＳ４）。なお、この際、Ｐin×ηとＰｏが完全に一致しているか否かを判断する必要はなく、例えばＰｏがＰin×ηに対して±Ｘ％以内であるか否かにより判断する等、誤差等を考慮して適宜判断条件を設定しておけばよい。   The failure diagnosis unit 22 obtains the input power Pin # 1 and Pin # 2 from the input power measurement units 21-1 and 21-2 and obtains Pin as the sum of them, and obtains the output power Po from the output power measurement unit 23. Obtain (step S3). Then, the failure diagnosis unit 22 obtains Pin × η, which is an estimated value of the output voltage, and determines whether Po = Pin × η is satisfied (step S4). At this time, it is not necessary to determine whether Pin × η and Po completely coincide with each other. For example, it is determined based on whether Po is within ± X% with respect to Pin × η. The determination conditions may be set as appropriate in consideration of the above.

Ｐｏ＝Ｐin×ηであると判断した場合（ステップＳ４ Ｙｅｓ）、故障診断部２２は、電力変換装置２が正常であると診断（判定）し（ステップＳ５）、処理を終了する。Ｐｏ＝Ｐin×ηでないと判断した場合（ステップＳ４ Ｎｏ）、故障診断部２２は、電力変換装置２に故障が生じていると診断し（ステップＳ６）、所定の故障処理を実施し（ステップＳ７）、処理を終了する。なお、所定の故障処理は、どのような処理でもよいが、例えば、故障であることをユーザに通知を行う処理や電力変換の動作を停止する処理等を行う。   When it is determined that Po = Pin × η (step S4 Yes), the failure diagnosis unit 22 diagnoses (determines) that the power converter 2 is normal (step S5), and ends the process. When it is determined that Po = Pin × η is not satisfied (No in step S4), the failure diagnosis unit 22 diagnoses that a failure has occurred in the power conversion device 2 (step S6), and performs predetermined failure processing (step S7). ), The process is terminated. The predetermined failure process may be any process. For example, a process for notifying the user that a failure has occurred and a process for stopping the power conversion operation are performed.

以上のように、本実施の形態では、入力電力計測部２１−１，２１−２が入力装置１−１，１−２からそれぞれ電力変換装置２へ入力される入力電力を測定し、出力電力計測部２３が電力変換装置２から出力される出力電力を測定する。そして、故障診断部２２が、入力電力の総和と、出力電力と、動作モードごとに設定された電力変換効率と、に基づいて電力変換装置２が故障であるか否かを判断するようにした。このため、太陽光発電用パワーコンディショナ等のように入力される電力パターンが多様でかつ複数の入力電力を有する場合にも電力変換装置の故障診断を行うことができる。また、このように、故障と判断した場合に動作の停止等を実施することにより、従属故障を防ぐことができる。さらに、個々の電力計測部が自己検証回路を設けることなく、１つの演算部にて故障診断を実施するため、安価にシステムを実現することが可能となる。   As described above, in the present embodiment, the input power measuring units 21-1 and 21-2 measure the input power input from the input devices 1-1 and 1-2 to the power converter 2, respectively, and the output power The measurement unit 23 measures the output power output from the power conversion device 2. Then, the failure diagnosis unit 22 determines whether or not the power conversion device 2 is in failure based on the sum of the input power, the output power, and the power conversion efficiency set for each operation mode. . For this reason, failure diagnosis of the power conversion device can be performed even when the input power patterns are various and have a plurality of input powers such as a power conditioner for photovoltaic power generation. In addition, the dependent failure can be prevented by stopping the operation or the like when it is determined that the failure has occurred. Furthermore, since each power measurement unit performs failure diagnosis with one arithmetic unit without providing a self-verification circuit, a system can be realized at low cost.

なお、入力電力計測部２１−１，２１−２および出力電力計測部２３のうち１つ以上を計測精度の異なる独立した計測系を複数備え、故障診断部２２は、２組以上の独立した計測系の計測結果に基づいて上述の故障診断を行うようにしてもよい。これにより、例えば、各々計測系による計測結果を比較することにより計測精度を検証することができる。具体的には、例えば、複数ある計測系により得られた計測値（実測値）と推定値（複数ある計測系のいづれか一つを対象として得られる入力または出力の演算値）とを比較検証できる。   Note that one or more of the input power measurement units 21-1, 21-2 and the output power measurement unit 23 are provided with a plurality of independent measurement systems having different measurement accuracy, and the failure diagnosis unit 22 has two or more sets of independent measurements. You may make it perform the above-mentioned failure diagnosis based on the measurement result of a system. Thereby, for example, the measurement accuracy can be verified by comparing the measurement results obtained by the measurement systems. Specifically, for example, a measured value (actually measured value) obtained by a plurality of measurement systems and an estimated value (input or output operation values obtained for one of the plurality of measurement systems) can be compared and verified. .

実施の形態２．
図４は、本発明にかかる電力変換システムの実施の形態２の構成例を示す図である。本実施の形態の電力変換システムは、実施の形態１の電力変換装置２を電力変換装置２ａに代え、電流計測部４−１，４−２，６と、電圧計測部５−１，５−２，７と、を追加する以外は実施の形態１の電力変換システムと同様である。実施の形態１と同様の機能を有する構成要素は、実施の形態１と同一の符号を付して説明を省略する。 Embodiment 2. FIG.
FIG. 4 is a diagram illustrating a configuration example of a second embodiment of the power conversion system according to the present invention. In the power conversion system of the present embodiment, the power conversion device 2 of the first embodiment is replaced with the power conversion device 2a, and current measurement units 4-1, 4-2, and 6 and voltage measurement units 5-1 and 5- 2 and 7 are the same as those of the power conversion system of the first embodiment except for adding 2. Components having the same functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

実施の形態１では、電力変換装置２内で入力電力および出力電力の計測を行ったが、本実施の形態では、電力変換装置２ａの外部に電流計測部４−１，４−２，６および電圧計測部５−１，５−２，７を備え、外部で計測した結果を電力変換装置２ａが通信回線等により取得して故障診断を行う。   In the first embodiment, the input power and the output power are measured in the power conversion device 2, but in the present embodiment, the current measurement units 4-1, 4-2, and 6 are provided outside the power conversion device 2a. Voltage measuring units 5-1, 5-2, 7 are provided, and the power conversion device 2 a obtains a result measured externally through a communication line or the like and performs failure diagnosis.

図４に示すように、本実施の形態の電力変換装置２ａは、電力変換部２４と、演算部２５−１，２５−２と、故障診断部２６と、を備える。演算部２５−１は、電流計測部４−１および電圧計測部５−１により計測された電流Ｉｓ＃１および電圧Ｖｓ＃１を取得して、これらに基づいて電力Ｐin＃１を求める。演算部２５−２は、電流計測部４−２および電圧計測部５−２により計測された電流Ｉｓ＃２および電圧Ｖｓ＃２を取得して、これらに基づいて電力Ｐin＃２を求める。本実施の形態では、演算部２５−１，２５−２、故障診断部２６、電流計測部４−１，４−２，６および電圧計測部５−１，５−２，７により故障診断装置を構成する。   As illustrated in FIG. 4, the power conversion device 2 a according to the present embodiment includes a power conversion unit 24, calculation units 25-1 and 25-2, and a failure diagnosis unit 26. The calculation unit 25-1 acquires the current Is # 1 and the voltage Vs # 1 measured by the current measurement unit 4-1 and the voltage measurement unit 5-1, and obtains the power Pin # 1 based on these. The computing unit 25-2 acquires the current Is # 2 and the voltage Vs # 2 measured by the current measuring unit 4-2 and the voltage measuring unit 5-2, and obtains the power Pin # 2 based on these. In the present embodiment, the fault diagnosis apparatus includes arithmetic units 25-1, 25-2, a fault diagnosis unit 26, current measurement units 4-1, 4-2, 6 and voltage measurement units 5-1, 5-2, 7. Configure.

故障診断部２６は、電流計測部６および電圧計測部７により計測された電流Ｉｏおよび電圧Ｖｏを取得して、これらに基づいてＰｏを求めるとともに、実施の形態１の故障診断部２２と同様の故障診断処理を実施する。以上述べた以外の本実施の形態の動作は実施の形態１と同様である。   Failure diagnosis unit 26 acquires current Io and voltage Vo measured by current measurement unit 6 and voltage measurement unit 7, obtains Po based on these, and is similar to failure diagnosis unit 22 of the first embodiment. Perform failure diagnosis processing. The operations of the present embodiment other than those described above are the same as those of the first embodiment.

なお、本実施の形態では、故障診断部２６が、電流計測部６および電圧計測部７により計測された電流Ｉｏおよび電圧Ｖｏを取得して、これらに基づいてＰｏを求める出力電力演算部としての機能と、実施の形態１の故障診断部２２と同様の機能と、を備えるようにしたが、出力電力演算部を故障診断部２６とは別に備えるようにしてもよい。   In the present embodiment, failure diagnosis unit 26 obtains current Io and voltage Vo measured by current measurement unit 6 and voltage measurement unit 7, and serves as an output power calculation unit that obtains Po based on these. Although the function and the function similar to the failure diagnosis unit 22 of the first embodiment are provided, the output power calculation unit may be provided separately from the failure diagnosis unit 26.

本実施の形態においても、電流計測部４−１，４−２，６および電圧計測部５−１，５−２，７の少なくとも１つ以上について計測精度の異なる独立した計測系を複数備えるようにしてもよい。   Also in the present embodiment, a plurality of independent measurement systems having different measurement accuracy are provided for at least one of the current measurement units 4-1, 4-2, 6 and the voltage measurement units 5-1, 5-2, 7. It may be.

このように、計測系を電力変換装置２ａの外部に備えることで、実施の形態１と同様の効果が得られるとともに、安価にシステムを構築することができる。   Thus, by providing the measurement system outside the power conversion device 2a, the same effects as in the first embodiment can be obtained, and the system can be constructed at low cost.

１−１，１−２ 入力装置
２，２ａ 電力変換装置
３ 負荷
４−１，４−２，６，２１１，２３１ 電流計測部
５−１，５−２，７，２１２，２３２ 電圧計測部
２１−１，２１−２，２１３，２３３ 電力計測部
２２，２６ 故障診断部
２３ 出力電力計測部
２４ 電力変換部
２５−１，２５−２ 演算部 1-1, 1-2 Input device 2, 2a Power converter 3 Load 4-1, 4-2, 6, 211, 231 Current measuring unit 5-1, 5-2, 7, 212, 232 Voltage measuring unit 21 -1,21-2,213,233 Power measurement unit 22,26 Fault diagnosis unit 23 Output power measurement unit 24 Power conversion unit 25-1, 25-2 Calculation unit

Claims (7)

複数の入力電力を電力変換して出力電力を生成する電力変換装置の故障を診断する故障診断装置であって、
前記入力電力ごとに入力電力値を計測する入力電力計測部と、
前記出力電力の出力電力値を計測する出力電力計測部と、
前記出力電力値と、前記入力電力値の総和と所定の電力変換効率との乗算結果と、の差が所定の範囲内であるか否かに基づいて前記電力変換装置の故障を診断する、ことを特徴とする故障診断装置。 A failure diagnosis device for diagnosing a failure of a power conversion device that converts a plurality of input powers to generate output power,
An input power measuring unit that measures an input power value for each input power;
An output power measuring unit for measuring an output power value of the output power;
Diagnosing a failure of the power conversion device based on whether or not a difference between the output power value and a multiplication result of the sum of the input power values and a predetermined power conversion efficiency is within a predetermined range; A failure diagnosis apparatus characterized by the above. 前記故障診断部は、前記電力変換装置の動作モードと電力変換効率との対応を変換効率情報として保持し、前記電力変換装置の動作モードと前記変換効率情報に基づいて前記所定の電力変換効率を設定する、ことを特徴とする請求項１に記載の故障診断装置。   The failure diagnosis unit holds a correspondence between an operation mode of the power conversion device and power conversion efficiency as conversion efficiency information, and determines the predetermined power conversion efficiency based on the operation mode of the power conversion device and the conversion efficiency information. The fault diagnosis apparatus according to claim 1, wherein the fault diagnosis apparatus is set. 前記入力電力計測部、前記出力電力計測部のうち少なくとも１つの計測部は、計測精度の異なる独立した２以上の計測系を有し、
前記故障診断部は、前記２以上の計測系の計測結果を比較することにより、計測精度を検証する、ことを特徴とする請求項１または２に記載の故障診断装置。 At least one of the input power measurement unit and the output power measurement unit has two or more independent measurement systems with different measurement accuracy,
The failure diagnosis apparatus according to claim 1, wherein the failure diagnosis unit verifies measurement accuracy by comparing measurement results of the two or more measurement systems. 複数の入力電力を電力変換して出力電力を生成する電力変換装置の故障を診断する故障診断装置であって、
前記入力電力ごとに入力電力値を計測する入力電力計測部と、
前記出力電力の出力電力値を計測する出力電力計測部と、
前記入力電力値の総和と所定の電力変換効率とに基づいて出力電力の推定値を求め、前記出力電力値と前記推定値との差に基づいて前記電力変換装置の故障を診断する故障診断部と、
を備えることを特徴とする故障診断装置。 A failure diagnosis device for diagnosing a failure of a power conversion device that converts a plurality of input powers to generate output power,
An input power measuring unit that measures an input power value for each input power;
An output power measuring unit for measuring an output power value of the output power;
A failure diagnosis unit that obtains an estimated value of output power based on the sum of the input power values and a predetermined power conversion efficiency, and diagnoses a failure of the power conversion device based on a difference between the output power value and the estimated value When,
A failure diagnosis apparatus comprising: 複数の入力電力を電力変換して出力電力を生成する電力変換装置であって、
前記入力電力ごとに入力電力値を計測する入力電力計測部と、
前記出力電力の出力電力値を計測する出力電力計測部と、
前記入力電力値の総和と所定の電力変換効率とに基づいて出力電力の推定値を求め、前記出力電力値と前記推定値との差に基づいて前記電力変換装置の故障を診断する故障診断部と、
を備えることを特徴とする電力変換装置。 A power conversion device that generates a power by converting a plurality of input powers,
An input power measuring unit that measures an input power value for each input power;
An output power measuring unit for measuring an output power value of the output power;
A failure diagnosis unit that obtains an estimated value of output power based on the sum of the input power values and a predetermined power conversion efficiency, and diagnoses a failure of the power conversion device based on a difference between the output power value and the estimated value When,
A power conversion device comprising: 複数の入力電力を電力変換して出力電力を生成する電力変換装置であって、
前記電力変換装置の外部で計測された前記入力電力の電流値および電圧値を取得し、前記電流値および前記電圧値に基づいて入力電力ごとの入力電力値を求める演算部と、
前記電力変換装置の外部で計測された前記出力電力の電流値および電圧値を取得し、当該電流値および電圧値に基づいて前記出力電力の出力電力値を求める出力電力演算部と、
前記入力電力値の総和と所定の電力変換効率とに基づいて出力電力の推定値を求め、前記出力電力値と前記推定値との差に基づいて前記電力変換装置の故障を診断する故障診断部と、
を備えることを特徴とする電力変換装置。 A power conversion device that generates a power by converting a plurality of input powers,
An arithmetic unit that obtains a current value and a voltage value of the input power measured outside the power converter, and obtains an input power value for each input power based on the current value and the voltage value;
An output power calculation unit that obtains a current value and a voltage value of the output power measured outside the power converter, and obtains an output power value of the output power based on the current value and the voltage value;
A failure diagnosis unit that obtains an estimated value of output power based on the sum of the input power values and a predetermined power conversion efficiency, and diagnoses a failure of the power conversion device based on a difference between the output power value and the estimated value When,
A power conversion device comprising: 複数の入力電力を電力変換して出力電力を生成する電力変換装置の故障を診断する故障診断方法であって、
前記入力電力ごとに入力電力値を計測する入力電力計測ステップと、
前記出力電力の出力電力値を計測する出力電力計測ステップと、
前記入力電力値の総和と所定の電力変換効率とに基づいて出力電力の推定値を求め、前記出力電力値と前記推定値との差に基づいて前記電力変換装置の故障を診断する故障診断ステップと、
を含むことを特徴とする故障診断方法。 A failure diagnosis method for diagnosing a failure in a power conversion device that generates output power by converting a plurality of input powers,
An input power measurement step of measuring an input power value for each input power;
An output power measurement step for measuring an output power value of the output power; and
A failure diagnosis step of obtaining an estimated value of output power based on the sum of the input power values and a predetermined power conversion efficiency, and diagnosing a failure of the power conversion device based on a difference between the output power value and the estimated value When,
A failure diagnosis method comprising:
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016132739A1 (en) * 2015-02-20 2016-08-25 パナソニックＩｐマネジメント株式会社 Power conversion device
JP2016201914A (en) * 2015-04-10 2016-12-01 株式会社オートネットワーク技術研究所 Semiconductor device, transformation device, and power supply system
KR101706591B1 (en) * 2016-08-11 2017-02-15 (주)지엔피 Photovoltaic system with trip function for fire protection
EP3306333A1 (en) * 2016-10-04 2018-04-11 ABB Schweiz AG Differential fault detection system
JP2019062582A (en) * 2017-09-22 2019-04-18 トヨタ自動車株式会社 Current sensor diagnostic device
CN110212494A (en) * 2018-02-28 2019-09-06 西门子公司 Protective relaying device, method and computer storage medium
CN111443253A (en) * 2020-04-17 2020-07-24 福州大学 Power electronic equipment soft fault diagnosis method and system based on conversion efficiency

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843176A (en) * 1981-09-08 1983-03-12 Toshiba Corp Malfunction detecting circuit for power converter
JPS63140692A (en) * 1986-12-01 1988-06-13 Tokyo Gas Co Ltd Operating condition detection of variable speed driving of rotary load machine
JPH07241001A (en) * 1994-02-25 1995-09-12 Mitsubishi Electric Corp Auxiliary power supply apparatus for vehicle
JP2000175454A (en) * 1998-12-04 2000-06-23 Mitsubishi Electric Corp Fault-detecting device for power converter
JP2009213246A (en) * 2008-03-04 2009-09-17 Honda Motor Co Ltd Method for detecting failure of dc/dc converter
JP2009289664A (en) * 2008-05-30 2009-12-10 Toshiba Lighting & Technology Corp Lighting device for discharge lamp, and illumination apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843176A (en) * 1981-09-08 1983-03-12 Toshiba Corp Malfunction detecting circuit for power converter
JPS63140692A (en) * 1986-12-01 1988-06-13 Tokyo Gas Co Ltd Operating condition detection of variable speed driving of rotary load machine
JPH07241001A (en) * 1994-02-25 1995-09-12 Mitsubishi Electric Corp Auxiliary power supply apparatus for vehicle
JP2000175454A (en) * 1998-12-04 2000-06-23 Mitsubishi Electric Corp Fault-detecting device for power converter
JP2009213246A (en) * 2008-03-04 2009-09-17 Honda Motor Co Ltd Method for detecting failure of dc/dc converter
JP2009289664A (en) * 2008-05-30 2009-12-10 Toshiba Lighting & Technology Corp Lighting device for discharge lamp, and illumination apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016132739A1 (en) * 2015-02-20 2016-08-25 パナソニックＩｐマネジメント株式会社 Power conversion device
US10630194B2 (en) 2015-02-20 2020-04-21 Panasonic Intellectual Property Management Co., Ltd. Power conversion device
JP2016201914A (en) * 2015-04-10 2016-12-01 株式会社オートネットワーク技術研究所 Semiconductor device, transformation device, and power supply system
KR101706591B1 (en) * 2016-08-11 2017-02-15 (주)지엔피 Photovoltaic system with trip function for fire protection
EP3306333A1 (en) * 2016-10-04 2018-04-11 ABB Schweiz AG Differential fault detection system
US10186855B2 (en) 2016-10-04 2019-01-22 Abb Schweiz Ag Differential fault detection system
JP2019062582A (en) * 2017-09-22 2019-04-18 トヨタ自動車株式会社 Current sensor diagnostic device
CN110212494A (en) * 2018-02-28 2019-09-06 西门子公司 Protective relaying device, method and computer storage medium
WO2019166535A1 (en) * 2018-02-28 2019-09-06 Siemens Aktiengesellschaft A relay protection apparatus and method, and a computer storage medium
CN111443253A (en) * 2020-04-17 2020-07-24 福州大学 Power electronic equipment soft fault diagnosis method and system based on conversion efficiency
CN111443253B (en) * 2020-04-17 2021-07-23 福州大学 Power electronic equipment soft fault diagnosis method and system based on conversion efficiency

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