JP3173376B2 - Apparatus for determining the capacitance of a capacitor of a three-level power converter - Google Patents
Apparatus for determining the capacitance of a capacitor of a three-level power converterInfo
- Publication number
- JP3173376B2 JP3173376B2 JP15369996A JP15369996A JP3173376B2 JP 3173376 B2 JP3173376 B2 JP 3173376B2 JP 15369996 A JP15369996 A JP 15369996A JP 15369996 A JP15369996 A JP 15369996A JP 3173376 B2 JP3173376 B2 JP 3173376B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- capacitor
- voltage dividing
- power converter
- elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
- Protection Of Static Devices (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、直流を交流または
交流を直流に変換する３レベル電力変換器に係わり、特
に直流側の分圧コンデンサの保守性向上と保護に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-level power converter for converting direct current to alternating current or alternating current to direct current, and more particularly to improving the maintenance and protection of a DC side voltage dividing capacitor.
【０００２】[0002]
【従来の技術】電力変換器に備えられた直流側コンデン
サの容量を検出する技術として、直流電源投入時の初期
充電波形を利用して、その時定数の測定によって容量値
を推定する技術が知られている。当然ながら、この技術
は電力変換器の交流側電圧レベル数（２レベル，３レベ
ル、あるいはそれ以上）に関係なく適用可能である。2. Description of the Related Art As a technique for detecting the capacitance of a DC-side capacitor provided in a power converter, there is known a technique for estimating a capacitance value by measuring a time constant using an initial charging waveform when a DC power supply is turned on. ing. Of course, this technique is applicable irrespective of the number of AC converter voltage levels (two levels, three levels, or more).
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術では、電
源電圧や充電用抵抗等によってコンデンサの充電時間が
左右されるため、コンデンサ容量の高精度な検出には外
部回路条件の正確な検出が前提となる。In the above prior art, since the charging time of the capacitor is influenced by the power supply voltage, the charging resistance, and the like, the accurate detection of the capacitance of the capacitor requires the accurate detection of the external circuit condition. Becomes
【０００４】本発明の目的は、３レベル電力変換器にお
いて、外部回路条件に左右されることなく、安定的かつ
高精度にコンデンサ容量の低下を判定可能な装置を実現
することにある。An object of the present invention is to provide a three-level power converter that can stably and accurately determine a decrease in the capacitance of a capacitor without being affected by external circuit conditions.
【０００５】[0005]
【課題を解決するための手段】上記目的は、直流電源の
両端に接続された分圧コンデンサの両端に、１相分とし
て４個のスイッチング素子Ｓ１〜Ｓ４を直列接続してな
るスイッチングアームが３相分並列接続され、各相スイ
ッチングアームの素子Ｓ２とＳ３の接続点に交流端子が
接続され、各相スイッチングアームの素子Ｓ１とＳ２及
びＳ３とＳ４の各接続点に夫々整流素子を介して前記分
圧コンデンサの中間電位である分圧点が接続され、周波
数及び電圧の各指令信号に基づき前記スイッチング素子
の選択的なオン・オフ制御により前記分圧コンデンサの
直流電圧から前記交流端子に高電位，中間電位及び低電
位の３レベルからなる交流電圧が出力される３レベル電
力変換器において、前記分圧コンデンサの分圧点におけ
る前記交流出力電圧の３倍の周波数成分を検出する手段
と、前記検出した３倍の周波数成分の大きさが所定の基
準値より大きくなったとき、前記分圧コンデンサの容量
が低下したものと判断する手段を備えることにより達成
される。An object of the present invention is to provide a voltage dividing capacitor connected to both ends of a DC power supply with one phase at both ends.
To connect the four switching elements S1 to S4 in series.
Switching arms are connected in parallel for three phases.
An AC terminal is provided at the connection point between the elements S2 and S3 of the switching arm.
Connected, the elements S1 and S2 of each phase switching arm and
And each connection point of S3 and S4 via a rectifying element.
The voltage dividing point, which is the intermediate potential of the
The switching element based on the number and voltage command signals
Selective on / off control of
High potential to the AC terminal from the DC voltage, the three-level power converter AC voltage of three levels of the intermediate potential and the low potential is output, the AC Ru <br/> put to the partial pressure point of the partial pressure condenser Means for detecting a frequency component three times the output voltage, and means for judging that the capacity of the voltage dividing capacitor has decreased when the magnitude of the detected frequency component three times exceeds a predetermined reference value. This is achieved by providing:
【０００６】これにより、外部回路条件の影響を受けな
い交流的な中性点電圧変動成分を検出し、この振幅値が
所定の基準値を越えたとき直流コンデンサ容量が低下し
たと判定するように動作する。Thus, an AC neutral point voltage fluctuation component which is not affected by external circuit conditions is detected, and when the amplitude value exceeds a predetermined reference value, it is determined that the DC capacitor capacity has decreased. Operate.
【０００７】[0007]
【発明の実施の形態】図１に本発明の一実施例を示す。
図１は電気車駆動用の３レベルインバータに適用した場
合の例である。FIG. 1 shows an embodiment of the present invention.
FIG. 1 shows an example in which the present invention is applied to a three-level inverter for driving an electric vehicle.
【０００８】図１において、１は直流電圧源である架
線、２１，２２は直流電圧源１の電圧から交流出力側の
零電位に相当する中性点電圧を作り出すためＰＮ間に接
続・分割した分圧コンデンサである。これらの分圧コン
デンサは、従来の２レベルインバータの直流側フィルタ
コンデンサとしての役割も果たしている。３０〜３３は
フリーホイール用の整流素子を備えた自己消弧可能なス
イッチング素子（この例ではＩＧＢＴとしたが、ＧＴ
Ｏ，トランジスタ等でも良い）、３４，３５はコンデン
サの中性点電圧を導出する補助整流素子である。３ａで
Ｕ相一相分のスイッチングアームを構成し、３ｂ及び３
ｃは、３ａと同様の構成で、それぞれＶ相分とＷ相分を
構成する。４はインバータの負荷装置である誘導電動機
である。In FIG. 1, reference numeral 1 denotes an overhead wire as a DC voltage source, and 22 and 22 are connected and divided between PNs to generate a neutral point voltage corresponding to zero potential on the AC output side from the voltage of the DC voltage source 1. It is a voltage dividing capacitor. These voltage dividing capacitors also serve as DC side filter capacitors of a conventional two-level inverter. 30 to 33 are self-extinguishing switching elements provided with a rectifying element for a freewheel (in this example, IGBTs are used.
O, transistors, etc.), and 34 and 35 are auxiliary rectifiers for deriving the neutral point voltage of the capacitor. 3a constitutes a switching arm for one U-phase, and 3b and 3
c has a configuration similar to that of 3a, and constitutes a V phase component and a W phase component, respectively. Reference numeral 4 denotes an induction motor which is a load device of the inverter.
【０００９】スイッチングアーム３ａ〜３ｃは、それぞ
れ相毎に独立に動作可能であり、スイッチング素子の選
択的なオン・オフ制御によりインバータ交流側端子に３
レベルの出力電圧を発生する。なお、３レベルインバー
タの主回路の詳細は特開昭51−47848号公報，特開昭56
−74088号公報など、また、ＰＷＭ制御の詳細は特願平3
−301512号などに記載されている。The switching arms 3a to 3c can operate independently for each phase, and are connected to the inverter AC side terminal by selective on / off control of switching elements.
Generates a level output voltage. The details of the main circuit of the three-level inverter are described in JP-A-51-47848 and JP-A-56-47848.
For details of PWM control, see Japanese Patent Application No. Hei.
-301512.
【００１０】図１における５はＰＷＭ制御回路であり、
インバータ出力電圧の周波数指令Ｆｉ＊，電圧指令Ｅ
＊，分圧コンデンサ電圧ｅcp，ｅcn及びゲートスタート
／ストップ信号ＧＳＳ等を入力し、スイッチング素子
（Ｕ相は３０〜３３）に与えるゲート信号（オン・オフ
信号）を出力する。ここで、電圧ｅcp，ｅcnは分圧コン
デンサ２１及び２２の電圧分担を均等化するための中性
点電圧制御に主に利用している。Reference numeral 5 in FIG. 1 denotes a PWM control circuit.
Inverter output voltage frequency command Fi *, voltage command E
*, Voltage divider capacitor voltages e cp and e cn, gate start / stop signal GSS, etc., are input, and a gate signal (ON / OFF signal) to be given to the switching element (U-phase 30 to 33) is output. Here, the voltages e cp and e cn are mainly used for neutral point voltage control for equalizing the voltage sharing of the voltage dividing capacitors 21 and 22.
【００１１】一方、６は本発明の特徴部分に相当するコ
ンデンサ容量判定回路である。このコンデンサ容量判定
回路６は、中性点電圧の交流成分検出器６１，前記交流
成分の振幅値(大きさ)を検出する最大値検出器６２，第
１の比較器６３，第２の比較器６４、及び前記交流電圧
の振幅値の履歴を記録するメモリ６５から構成される。
７１は第１の比較器によって判定されるコンデンサ容量
の低下を警告するための外部表示器である。７２はメモ
リ６５の記録データを読み出すための回路である。当然
ながら、表示器７１やモニタ７２はコンデンサ容量判定
回路６やＰＷＭ制御回路などの内部にあっても良い。On the other hand, reference numeral 6 denotes a capacitor capacity judging circuit corresponding to a feature of the present invention. The capacitor capacity determination circuit 6 includes an AC component detector 61 for a neutral point voltage, a maximum value detector 62 for detecting an amplitude value (magnitude) of the AC component, a first comparator 63, and a second comparator. 64, and a memory 65 for recording the history of the amplitude value of the AC voltage.
Reference numeral 71 denotes an external display for warning a decrease in the capacitance of the capacitor determined by the first comparator. Reference numeral 72 denotes a circuit for reading the recording data in the memory 65. As a matter of course, the display 71 and the monitor 72 may be provided inside the capacitor capacity determination circuit 6 or the PWM control circuit.
【００１２】以下，図１及び図２を用いて動作を説明す
る。The operation will be described below with reference to FIGS.
【００１３】３レベルインバータでは、運転時にインバ
ータ出力周波数の３倍の周波数の交流的変動が、中性点
電圧に発生する。図２に、動作波形の一例を示す。図２
(ｂ)及び（ｃ）に示すように、分圧コンデンサの電圧ｅ
cp，ｅcnは互いに逆位相で、出力電圧・電流の３倍の周
波数で脈動する。この時の電圧変動の振幅をΔＥｏとす
ると、In a three-level inverter, an AC fluctuation of a frequency three times the inverter output frequency occurs in the neutral point voltage during operation. FIG. 2 shows an example of the operation waveform. FIG.
As shown in (b) and (c), the voltage e of the voltage dividing capacitor
cp and ecn have opposite phases and pulsate at a frequency three times the output voltage and current. If the amplitude of the voltage fluctuation at this time is ΔEo,
【００１４】[0014]
【数１】 (Equation 1)
【００１５】ここに，ａ：変調率 Ｉｍ：インバータ出力電流（基本波実効値） Ｆｉ：インバータ周波数 Ｃ：分圧コンデンサ容量 で与えられ、ΔＥｏは変調率（インバータ出力電圧基本
波振幅を分圧コンデンサ平均電圧で規格化した値），イ
ンバータ出力電流，インバータ周波数等の制御変数とコ
ンデンサ容量から一義的に定まる。ΔＥｏは直流電源電
圧やコンデンサ容量以外の外部回路定数に依存しない。
ΔＥｏが求まれば、コンデンサ容量Ｃは直ちに求められ
ることはいうまでもない。Here, a: modulation rate Im: inverter output current (fundamental wave effective value) Fi: inverter frequency C: voltage dividing capacitor capacity, and ΔEo is modulation rate (inverter output voltage fundamental wave amplitude represents voltage dividing capacitor It is uniquely determined from control variables such as the value standardized by the average voltage), the inverter output current, the inverter frequency, etc., and the capacitor capacity. ΔEo does not depend on external circuit constants other than the DC power supply voltage and the capacitance of the capacitor.
Obviously, when ΔEo is obtained, the capacitor capacitance C is immediately obtained.
【００１６】本発明は、この３レベルインバータ特有の
性質を利用したものである。すなわち、図１において、
交流成分検出器６１により中性点電圧に含まれる交流成
分を検出し、その振幅値を最大値検出器６２で検出す
る。この最大値検出器６２は前記交流成分の振幅値を検
出するだけでなく、時々刻々と変化する運転状態のもと
での最大の電圧振幅を検出する役割を果たすこともでき
る。第１の比較器６３は（数１）の関係から定まるΔＥ
ｏの許容値の基準値１と検出結果とを比較して、ΔＥｏ
が基準値１よりも大きいときには出力ＣＣ１に“１”を
出力する（通常は“０”を出力）。表示器７は、ＣＣ１
が“１”となったときコンデンサ容量が低下したことを
示す表示を出力する。The present invention utilizes the characteristic characteristic of the three-level inverter. That is, in FIG.
The AC component included in the neutral point voltage is detected by the AC component detector 61, and the amplitude value is detected by the maximum value detector 62. The maximum value detector 62 can not only detect the amplitude value of the AC component, but also play a role of detecting the maximum voltage amplitude under an operating condition that changes every moment. The first comparator 63 calculates ΔE determined from the relationship of (Equation 1).
The reference value 1 of the allowable value of o is compared with the detection result, and ΔEo
Is larger than the reference value 1, "1" is output to the output CC1 (normally, "0" is output). The display 7 indicates CC1
Becomes "1", a display indicating that the capacitance of the capacitor has decreased is output.
【００１７】この実施例では、外部回路条件に左右され
ることなく、安定的かつ高精度にコンデンサ容量の低下
を検出できる効果がある。In this embodiment, there is an effect that a decrease in the capacitance of the capacitor can be detected stably and accurately without being influenced by the external circuit conditions.
【００１８】さらに、基準値２が基準値１よりも大きく
設定された第２の比較器６４は、最大値検出器６２の出
力が基準値２を越えたとき出力ＣＣ２に“１”を出力す
る（通常は“０”を出力）。その結果、ゲートスタート
／ストップ条件がゲートストップに固定され、ＰＷＭ制
御回路は主回路の運転を停止する。これにより、コンデ
ンサ容量が異常に低下した際に、それに伴うインバータ
の異常動作を未然に防止することが可能となる。Further, the second comparator 64 in which the reference value 2 is set larger than the reference value 1 outputs "1" to the output CC2 when the output of the maximum value detector 62 exceeds the reference value 2. (Normally, “0” is output). As a result, the gate start / stop condition is fixed to the gate stop, and the PWM control circuit stops the operation of the main circuit. This makes it possible to prevent an abnormal operation of the inverter accompanying the abnormal decrease in the capacitance of the capacitor.
【００１９】一方、中性点電圧の交流的変動の履歴を記
録するメモリ６５を設けることにより、コンデンサ容量
の経年変化の様子を知ることが可能となり、容量低下の
恐れのあるコンデンサを容易に見つけることができるよ
うになる。特に、保守作業の軽減に有効となる。On the other hand, by providing the memory 65 for recording the history of the AC fluctuation of the neutral point voltage, it is possible to know how the capacitor capacity changes over time, and to easily find a capacitor which may have a capacity decrease. Will be able to do it. In particular, it is effective for reducing maintenance work.
【００２０】以上の実施例は３レベルインバータに適用
した場合であるが、交流を直流に変換する３レベルコン
バータであっても同様の効果が期待できる。Although the above embodiment is applied to a three-level inverter, the same effect can be expected with a three-level converter that converts alternating current to direct current.
【００２１】本発明は、交流出力電圧が半周期間に同一
極性の電圧パルス列から構成されるユニポーラ変調制御
時に特に高精度な判定が可能である特徴がある。The present invention is characterized in that a highly accurate determination can be made during the unipolar modulation control in which the AC output voltage is composed of a voltage pulse train having the same polarity during a half cycle.
【００２２】図３に第２の実施例を示す。交流成分検出
器６１の入力信号が分圧コンデンサ電圧ｅcp及びｅcnの
差分となっている以外は、図１に示した実施例と同様で
ある。本実施例では、交流成分検出器６１の入力信号に
含まれる直流成分が微小であり、交流成分を効率よく検
出可能である。FIG. 3 shows a second embodiment. It is the same as the embodiment shown in FIG. 1 except that the input signal of the AC component detector 61 is a difference between the voltage dividing capacitor voltages ecp and ecn . In this embodiment, the DC component included in the input signal of the AC component detector 61 is minute, and the AC component can be detected efficiently.
【００２３】[0023]
【発明の効果】本発明によれば、３レベル電力変換器に
おいて、外部回路条件に左右されることなく、安定的か
つ高精度にコンデンサ容量を判定できる効果がある。According to the present invention, in a three-level power converter, there is an effect that the capacitance of a capacitor can be determined stably and with high accuracy without being affected by external circuit conditions.
【図１】本発明の第１の実施例を示す図。FIG. 1 is a diagram showing a first embodiment of the present invention.
【図２】本発明の動作波形を説明する図。FIG. 2 is a diagram illustrating operation waveforms of the present invention.
【図３】本発明の第２の実施例を説明する図。FIG. 3 is a diagram illustrating a second embodiment of the present invention.
１…架線、３ａ〜３ｃ…スイッチングアーム、４…誘導
電動機、５…ＰＷＭ制御回路、６…コンデンサ容量判定
回路、２１，２２…分圧コンデンサ、３０〜３３…スイ
ッチング素子、３４，３５…補助整流素子、７１…表示
器、７２…モニタ。DESCRIPTION OF SYMBOLS 1 ... Overhead wire, 3a-3c ... Switching arm, 4 ... Induction motor, 5 ... PWM control circuit, 6 ... Capacitor capacity determination circuit, 21, 22 ... Voltage dividing capacitor, 30-33 ... Switching element, 34, 35 ... Auxiliary rectification Element, 71 ... Display, 72 ... Monitor.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０２Ｐ 7/63 ３０２ Ｈ０２Ｐ 7/63 ３０２Ｋ (56)参考文献 特開 昭56−74088（ＪＰ，Ａ) 特開 平９−294375（ＪＰ，Ａ) 実開 昭63−97345（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02H 7/16 H02H 7/12 H02M 7/48 H02M 7/5387 H02P 7/63 302 ──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 7 identification symbol FI H02P 7/63 302 H02P 7/63 302K (56) References JP-A-56-74088 (JP, A) JP-A-9-294375 (JP, A) Japanese Utility Model 63-97345 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H02H 7/16 H02H 7/12 H02M 7/48 H02M 7/5387 H02P 7 / 63 302
Claims (2)
サの両端に、１相分として４個のスイッチング素子Ｓ１
〜Ｓ４を直列接続してなるスイッチングアームが３相分
並列接続され、各相スイッチングアームの素子Ｓ２とＳ
３の接続点に交流端子が接続され、各相スイッチングア
ームの素子Ｓ１とＳ２及びＳ３とＳ４の各接続点に夫々
整流素子を介して前記分圧コンデンサの中間電位である
分圧点が接続され、周波数及び電圧の各指令信号に基づ
き前記スイッチング素子の選択的なオン・オフ制御によ
り前記分圧コンデンサの直流電圧から前記交流端子に高
電位，中間電位及び低電位の３レベルからなる交流電圧
が出力される３レベル電力変換器において、 前記分圧コンデンサの分圧点における前記交流出力電圧
の３倍の周波数成分を検出する手段と、前記検出した３
倍の周波数成分の大きさが所定の基準値より大きくなっ
たとき、前記分圧コンデンサの容量が低下したものと判
断する手段を備えたことを特徴とする３レベル電力変換
器のコンデンサ容量判定装置。1. Four switching elements S1 for one phase are connected to both ends of a voltage dividing capacitor connected to both ends of a DC power supply.
To S4 connected in series for three phases
The elements S2 and S of each phase switching arm are connected in parallel.
AC terminal is connected to the connection point 3
At the connection points of the elements S1 and S2 and S3 and S4 of the
The intermediate potential of the voltage dividing capacitor via the rectifying element
The voltage dividing point is connected and based on the frequency and voltage command signals.
The switching element is selectively turned on and off.
An AC voltage comprising three levels of a high potential, an intermediate potential and a low potential from the DC voltage of the voltage dividing capacitor to the AC terminal.
3 but in a three-level power converter output, means for detecting a 3-fold the frequency components of the AC output voltage definitive to the partial pressure point of the partial pressure condenser, which is the detected
Means for judging that the capacity of the voltage dividing capacitor has decreased when the magnitude of the double frequency component has become larger than a predetermined reference value, wherein a capacitor capacity judging device for a three-level power converter is provided. .
サの両端に、１相分として４個のスイッチング素子Ｓ１
〜Ｓ４を直列接続してなるスイッチングアームが３相分
並列接続され、各相スイッチングアームの素子Ｓ２とＳ
３の接続点に交流端子が接続され、各相スイッチングア
ームの素子Ｓ１とＳ２及びＳ３とＳ４の各接続点に夫々
整流素子を介して前記分圧コンデンサの中間電位である
分圧点が接続され、周波数及び電圧の各指令信号に基づ
き前記スイッチング素子の選択的なオン・オフ制御によ
り前記分圧コンデンサの直流電圧から前記交流端子に高
電位，中間電位及び低電位の３レベルからなる交流電圧
が出力される３レベル電力変換器において、 前記分圧コンデンサの分圧点における前記交流出力電圧
の３倍の周波数成分を検出する手段と、該検出値の履歴
を記録する手段を備えたことを特徴とする３レベル電力
変換器のコンデンサ容量判定装置。2. Four switching elements S1 for one phase are connected to both ends of a voltage dividing capacitor connected to both ends of a DC power supply.
To S4 connected in series for three phases
The elements S2 and S of each phase switching arm are connected in parallel.
AC terminal is connected to the connection point 3
At the connection points of the elements S1 and S2 and S3 and S4 of the
The intermediate potential of the voltage dividing capacitor via the rectifying element
The voltage dividing point is connected and based on the frequency and voltage command signals.
The switching element is selectively turned on and off.
AC voltage consisting of three levels of high potential, intermediate potential and low potential from the DC voltage of the voltage dividing capacitor to the AC terminal.
In three-level power converter but output, further comprising means for detecting a 3-fold the frequency components of the AC output voltage definitive to the partial pressure point of the partial pressure condenser, the means for recording the history of the detected value An apparatus for determining the capacitance of a capacitor of a three-level power converter.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15369996A JP3173376B2 (en) | 1996-06-14 | 1996-06-14 | Apparatus for determining the capacitance of a capacitor of a three-level power converter |
| AU23706/97A AU690489B2 (en) | 1996-06-14 | 1997-05-29 | Capacity judging apparatus of capacitor in power converter outputting three level voltage |
| KR1019970023138A KR980006703A (en) | 1996-06-14 | 1997-06-04 | Capacitor Capacitance Determination Device for Three-Level Power Converters |
| ZA9705118A ZA975118B (en) | 1996-06-14 | 1997-06-10 | Capacity judging apparatus of capacitor in power converter outputting three level voltage. |
| CN97112735A CN1169049A (en) | 1996-06-14 | 1997-06-11 | Capacity judging apparatus of capacitor in power converter outputting three level voltage |
| BR9703583A BR9703583A (en) | 1996-06-14 | 1997-06-16 | Capacitor capacity evaluation device in a power converter that emits a three-level voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15369996A JP3173376B2 (en) | 1996-06-14 | 1996-06-14 | Apparatus for determining the capacitance of a capacitor of a three-level power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH104626A JPH104626A (en) | 1998-01-06 |
| JP3173376B2 true JP3173376B2 (en) | 2001-06-04 |
Family
ID=15568190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15369996A Expired - Fee Related JP3173376B2 (en) | 1996-06-14 | 1996-06-14 | Apparatus for determining the capacitance of a capacitor of a three-level power converter |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP3173376B2 (en) |
| KR (1) | KR980006703A (en) |
| CN (1) | CN1169049A (en) |
| AU (1) | AU690489B2 (en) |
| BR (1) | BR9703583A (en) |
| ZA (1) | ZA975118B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115312Y2 (en) * | 1980-01-22 | 1986-05-13 | ||
| FI120280B (en) | 2008-01-21 | 2009-08-31 | Switch High Power Converters O | Method for monitoring the condition of DC capacitors |
| DE102013104847A1 (en) * | 2013-05-10 | 2014-11-13 | Ebm-Papst Mulfingen Gmbh & Co. Kg | "Protective circuit for insulation damage due to failure of DC link capacitors" |
| EP3242391B1 (en) * | 2016-05-03 | 2020-03-04 | ABB Schweiz AG | Method for monitoring change in capacitance in electric system and electric system |
| JP7002985B2 (en) * | 2018-04-12 | 2022-01-20 | 株式会社東芝 | Power converter and control method of power converter |
| CN109347354B (en) * | 2018-11-26 | 2020-06-05 | 合肥科威尔电源系统股份有限公司 | Midpoint voltage ripple suppression device and method based on third harmonic injection |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4225912A (en) * | 1978-12-22 | 1980-09-30 | United Technologies Corporation | Control for an auxiliary commutation circuit |
| CH667761A5 (en) * | 1985-06-28 | 1988-10-31 | Bbc Brown Boveri & Cie | HIGH VOLTAGE DC VOLTAGE SOURCE. |
-
1996
- 1996-06-14 JP JP15369996A patent/JP3173376B2/en not_active Expired - Fee Related
-
1997
- 1997-05-29 AU AU23706/97A patent/AU690489B2/en not_active Ceased
- 1997-06-04 KR KR1019970023138A patent/KR980006703A/en not_active IP Right Cessation
- 1997-06-10 ZA ZA9705118A patent/ZA975118B/en unknown
- 1997-06-11 CN CN97112735A patent/CN1169049A/en active Pending
- 1997-06-16 BR BR9703583A patent/BR9703583A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1169049A (en) | 1997-12-31 |
| AU690489B2 (en) | 1998-04-23 |
| KR980006703A (en) | 1998-03-30 |
| JPH104626A (en) | 1998-01-06 |
| AU2370697A (en) | 1998-01-08 |
| BR9703583A (en) | 1998-07-07 |
| ZA975118B (en) | 1997-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5436819A (en) | Apparatus for and method of compensating for an output voltage error in an inverter output | |
| US9091742B2 (en) | Fault identification techniques for high resistance grounded systems | |
| US10263558B2 (en) | Phase loss detection in active front end converters | |
| JP2712470B2 (en) | Inverter current detection device | |
| US20200191846A1 (en) | Method and apparatus for detecting capacitance of filter capacitor of inverter | |
| US10605843B2 (en) | Inverter open/short failure detection | |
| JPH1014097A (en) | Capacitor capacitance determining device for power converter | |
| US4780656A (en) | Drive and protection system for variable speed motor | |
| US10644635B2 (en) | Systems and methods for motor drive cable characteristics identification and compensation therefor | |
| JP3173376B2 (en) | Apparatus for determining the capacitance of a capacitor of a three-level power converter | |
| CN109039199A (en) | One kind being used for EPS controller bus current evaluation method and system | |
| JP2821168B2 (en) | Inverter device and AC motor drive system | |
| JP2756049B2 (en) | Inverter output voltage error correction device | |
| US5367240A (en) | Low cost current sensor for fast-switching inverter applications | |
| JP5660222B2 (en) | Elevator control device | |
| JP7295519B2 (en) | Degradation estimating device and degradation estimating program for power converter | |
| JPH0670660B2 (en) | Inverter device | |
| JP3206866B2 (en) | Inverter dead time compensation method | |
| JP3179692B2 (en) | PWM control method and apparatus for three-level inverter with reduced switching loss | |
| JP2872210B1 (en) | Servo drive | |
| JP3295929B2 (en) | DC power supply | |
| JPH03877Y2 (en) | ||
| JP7490089B2 (en) | Air conditioners | |
| JP3978902B2 (en) | Ozone generator short circuit detection circuit | |
| JPH09294375A (en) | Capacitor capacitance judging apparatus for power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090330 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090330 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100330 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110330 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110330 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120330 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130330 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130330 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140330 Year of fee payment: 13 |
|
| LAPS | Cancellation because of no payment of annual fees |