JPH05161363A - Controller for power converter - Google Patents
Controller for power converterInfo
- Publication number
- JPH05161363A JPH05161363A JP3323507A JP32350791A JPH05161363A JP H05161363 A JPH05161363 A JP H05161363A JP 3323507 A JP3323507 A JP 3323507A JP 32350791 A JP32350791 A JP 32350791A JP H05161363 A JPH05161363 A JP H05161363A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- output
- voltage component
- current
- transformer
- 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.)
- Pending
Links
Landscapes
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電力変換装置の制御装
置に係り、特に電力変換装置における出力変圧器の直流
偏磁を防止するようにした制御装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a power converter, and more particularly to a control device for preventing DC bias magnetization of an output transformer in the power converter.
【０００２】[0002]
【従来の技術】図２は従来の定電圧定周波数電源装置
（ＣＶＣＦ装置）の直流偏磁防止装置を示す。同図にお
いて１は直流電源、２ａ〜２ｄは半導体スイッチ素子、
３は出力変圧器、４はコイル、５はコンデンサでこれら
のコイル４とコンデンサ５によって交流フィルタ回路６
が形成され、直流電源１，半導体スイッチ素子２ａ〜２
ｄ，出力変圧器３および交流フィルタ回路６によって主
回路が構成される。2. Description of the Related Art FIG. 2 shows a conventional DC bias prevention apparatus for a constant voltage constant frequency power supply (CVCF device). In the figure, 1 is a DC power supply, 2a to 2d are semiconductor switching elements,
3 is an output transformer, 4 is a coil, 5 is a capacitor, and the AC filter circuit 6 is composed of these coils 4 and 5.
Is formed, and the DC power supply 1 and the semiconductor switch elements 2a to 2 are formed.
d, the output transformer 3 and the AC filter circuit 6 constitute a main circuit.
【０００３】このような主回路構成のＣＶＣＦにおい
て、電圧変成器７により出力電圧を検出し、その検出電
圧を整流器８で整流し、この電圧値を回路９で設定電圧
値Ｖｓｅｔと比較し、増幅回路１０により誤差増幅し、
それと基準正弦波発生器１１の出力を掛算器１２にて掛
け合わせる。掛算器１２の出力と三角波発生器１３の出
力をコンパレータ１４にて大小比較し、制御信号Ｓａ〜
Ｓｄを作っている。また、出力変圧器３の一次電流を電
流変成器１５で検出し、その検出電流をローパスフィル
タ１６を通すことにより、直流成分を検出し、この値を
設定電流値Ｉｓｅｔと比較し、増幅回路１７により誤差
増幅し、突合回路１８で掛算器１２の出力をバイアスす
る事により、出力変圧器３の直流成分を制御している。
なお、図２には単相出力のＣＶＣＦについて示したが、
三相出力のＣＶＣＦにも同様に適用可能である。In the CVCF having such a main circuit configuration, the output voltage is detected by the voltage transformer 7, the detected voltage is rectified by the rectifier 8, and this voltage value is compared with the set voltage value Vset by the circuit 9 and amplified. Error amplification by the circuit 10,
It is multiplied by the output of the reference sine wave generator 11 by a multiplier 12. The output of the multiplier 12 and the output of the triangular wave generator 13 are compared in magnitude by a comparator 14, and control signals Sa to
I'm making Sd. Further, the primary current of the output transformer 3 is detected by the current transformer 15, and the detected current is passed through the low-pass filter 16 to detect the direct current component, and this value is compared with the set current value Iset, and the amplification circuit 17 The error component is amplified by and the output of the multiplier 12 is biased by the butting circuit 18 to control the DC component of the output transformer 3.
Although FIG. 2 shows the single-phase output CVCF,
The same can be applied to a three-phase output CVCF.
【０００４】[0004]
【発明が解決しようとする課題】電流変成器１５には負
荷電流が流れており、その中から数％程度の直流分を精
度よく検出する必要がある。しかし、電圧変成器７の精
度などにより、直流分の検出精度を上げるには限界があ
った。また、電流変成器１５によって直流電流成分を検
出しているために、直流電流が流れた後の偏磁した後で
検出するため、制御精度を上げることが困難であった。A load current is flowing through the current transformer 15, and it is necessary to accurately detect a DC component of about several percent of the load current. However, there is a limit to increase the detection accuracy of the DC component due to the accuracy of the voltage transformer 7. Further, since the direct current component is detected by the current transformer 15, the direct current component is detected after demagnetization after the direct current has flowed, which makes it difficult to improve control accuracy.
【０００５】本発明は上述の問題点に鑑みてなされたも
ので、その目的は電力変換装置の出力変圧器の一次側直
流電圧成分を検出し、この直流電圧成分を零にするよう
に制御することにより、直流偏磁を防止して制御精度の
向上を図ることである。The present invention has been made in view of the above problems, and an object thereof is to detect a primary side DC voltage component of an output transformer of a power conversion device and control the DC voltage component to be zero. By doing so, it is possible to prevent DC bias magnetization and improve control accuracy.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記目的を達
成するために、直流電力を交流電力に変換する逆電力変
換器の交流出力電力を出力変圧器を介して負荷に供給す
る電力変換装置において、前記出力変圧器の一次側端子
間の直流電圧成分を検出する第１の直流電力成分検出手
段と、前記出力変圧器の二次側の直流電圧成分を検出す
る第２の直流電圧成分検出手段と、これら第１，第２の
直流電圧検出手段の各直流電圧成分信号を比較して前記
逆電力変換器を制御する制御手段によって構成したこと
を特徴とする。In order to achieve the above-mentioned object, the present invention is a power conversion system for supplying alternating current output power of a reverse power converter for converting direct current power to alternating current power to a load through an output transformer. In the device, first DC power component detecting means for detecting a DC voltage component between the primary terminals of the output transformer, and second DC voltage component for detecting a DC voltage component on the secondary side of the output transformer. The detecting means and the control means for comparing the respective DC voltage component signals of the first and second DC voltage detecting means and controlling the inverse power converter are characterized by being constituted.
【０００７】[0007]
【作用】第１の直流電力変換手段により電力変換装置の
出力変圧器の一次側直流電圧成分を検出し、第２の直流
電力変換手段により出力変圧器の二次側直流電圧成分を
検出すると共に、これらの第１と第２の直流電圧成分を
比較処理して出力変圧器の直流電圧成分が零になるよう
に電力変換装置を制御する。With the first DC power converting means, the primary side DC voltage component of the output transformer of the power converter is detected, and the second DC power converting means detects the secondary side DC voltage component of the output transformer. , The first and second DC voltage components are compared and the power converter is controlled so that the DC voltage component of the output transformer becomes zero.
【０００８】[0008]
【実施例】以下に本発明の実施例を図１を参照しながら
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
【０００９】図１は本発明の実施例による定電圧定周波
数電源装置の直流偏磁防止装置を示すもので、図１にお
いて図２のものと同一又は相当部分には同一符号が付さ
れている。本実施例においては、出力変圧器３の一次側
入力端子間に高抵抗のダミー抵抗２０と電流変成器１５
を接続し、この電流変成器１５の電流検出信号をローパ
スフィルタ１６を通して直流電圧成分を得る直流電圧成
分検出部２１が形成されている。FIG. 1 shows a DC bias demagnetization prevention apparatus for a constant voltage constant frequency power supply according to an embodiment of the present invention. In FIG. 1, the same or corresponding parts as those in FIG. 2 are designated by the same reference numerals. . In the present embodiment, a high resistance dummy resistor 20 and a current transformer 15 are provided between the primary side input terminals of the output transformer 3.
And a DC voltage component detector 21 for obtaining a DC voltage component from the current detection signal of the current transformer 15 through the low pass filter 16 is formed.
【００１０】上記構成の直流偏磁防止装置において、逆
電力変換部であるインバータ２の交流出力電力は出力変
圧器３とフィルタ回路６を通して負荷に供給される。出
力変圧器３の２次側においては電圧変成器７により出力
電圧を検出し、その検出電圧を整流器８で整流し、この
電圧値を突合回路で設定電圧値Ｖｓｅｔと比較し、増幅
回路１０により誤差増幅し、それと基準正弦発生器１１
の出力を掛算器１２にて掛け合わせる。掛算器１２の出
力と三角波発生器１３の出力を比較器１４にて大小を比
較し、制御信号Ｓａ〜Ｓｄを得る。In the DC bias prevention apparatus having the above-mentioned structure, the AC output power of the inverter 2 which is a reverse power converter is supplied to the load through the output transformer 3 and the filter circuit 6. On the secondary side of the output transformer 3, the output voltage is detected by the voltage transformer 7, the detected voltage is rectified by the rectifier 8, this voltage value is compared with the set voltage value Vset by the butt circuit, and by the amplifier circuit 10. Error amplification and it and the reference sine generator 11
The output of is multiplied by the multiplier 12. The output of the multiplier 12 and the output of the triangular wave generator 13 are compared in magnitude by a comparator 14 to obtain control signals Sa to Sd.
【００１１】また、出力変圧器３の一次側においては、
ダミー抵抗２０を通して流れる電流を電流変成器１５で
検出し、この電流検出信号をローパスフィルタ１６を通
すことにより、出力変圧器３の一次側電圧に含まれる直
流電圧成分を検出する。ローパスフィルタ１６の出力信
号には直流電圧成分と直流電流成分が含まれており、突
合回路１８において直流電流成分は設定電流値Ｉｓｅｔ
と比較される。直流電流成分の誤差と直流電圧成分は増
幅回路１７により増幅され、突き合わせ回路１９によっ
て掛算器１２の直流電圧成分出力と比較し、さらに突き
合わせ回路１９の偏差出力信号を比較器１４で三角波発
生器１３の三角波信号と比較して制御信号Ｓａ〜Ｓｄを
得、この制御信号Ｓａ〜Ｓｄによってインバータ２を直
流電圧成分が零となるように制御する。On the primary side of the output transformer 3,
The current transformer 15 detects the current flowing through the dummy resistor 20, and the current detection signal is passed through the low-pass filter 16 to detect the DC voltage component contained in the primary side voltage of the output transformer 3. The output signal of the low-pass filter 16 includes a DC voltage component and a DC current component, and the DC current component is the set current value Iset in the merging circuit 18.
Compared to. The error of the DC current component and the DC voltage component are amplified by the amplifier circuit 17, compared with the DC voltage component output of the multiplier 12 by the matching circuit 19, and the deviation output signal of the matching circuit 19 is compared by the comparator 14 with the triangular wave generator 13. The control signals Sa to Sd are obtained by comparison with the triangular wave signal, and the inverter 2 is controlled by the control signals Sa to Sd so that the DC voltage component becomes zero.
【００１２】[0012]
【発明の効果】本発明は、上述の如くであって、電力変
換装置の出力変圧器の一次側に高抵抗を接続し、この抵
抗の電流を電流変成にて検出し、ローパスフィルタを通
すことにより出力変圧器の一次側に含まれる直流電圧成
分を検出し、この直流電圧成分を零にする様に制御する
ものであるから、直流偏磁を防止できて制御精度の向上
が図れる。According to the present invention, as described above, a high resistance is connected to the primary side of the output transformer of the power conversion device, the current of this resistance is detected by current transformation, and the current is passed through a low pass filter. By detecting the DC voltage component included in the primary side of the output transformer and controlling the DC voltage component to be zero, the DC bias can be prevented and the control accuracy can be improved.
【図１】本発明の実施例による電力変換装置の制御装置
のブロック図。FIG. 1 is a block diagram of a control device for a power conversion device according to an embodiment of the present invention.
【図２】従来の電力変換装置の制御装置のブロック図。FIG. 2 is a block diagram of a control device of a conventional power conversion device.
１…直流電源、２…インバータ、２ａ〜２ｄ…半導体ス
イッチ素子、３…出力変圧器、６…フィルタ回路、７…
電圧変成器、８…整理器、１０…増幅器、１１，１７…
基準正弦発生器、１２…掛算器、１３…三角波発生器、
１４…比較器、１５…電流変成器、１６…ローパスフィ
ルタ、２０…ダミー抵抗、２１…直流電圧検出部。DESCRIPTION OF SYMBOLS 1 ... DC power supply, 2 ... Inverter, 2a-2d ... Semiconductor switch element, 3 ... Output transformer, 6 ... Filter circuit, 7 ...
Voltage transformer, 8 ... Organizer, 10 ... Amplifier, 11, 17 ...
Reference sine generator, 12 ... Multiplier, 13 ... Triangular wave generator,
14 ... Comparator, 15 ... Current transformer, 16 ... Low pass filter, 20 ... Dummy resistor, 21 ... DC voltage detector.
Claims (1)
換器の交流出力電力を出力変圧器を介して負荷に供給す
る電力変換装置において、前記出力変圧器の一次側端子
間の直流電圧成分を検出する第１の直流電力成分検出手
段と、前記出力変圧器の二次側の直流電圧成分を検出す
る第２の直流電圧成分検出手段と、これら第１，第２の
直流電圧検出手段の各直流電圧成分信号を比較して前記
逆電力変換器を制御する制御手段によって構成したこと
を特徴とする電力変換装置の制御装置。1. A power converter for supplying AC output power of a reverse power converter for converting DC power to AC power to a load via an output transformer, wherein a DC voltage component between primary terminals of the output transformer. Of the first DC power component detecting means, the second DC voltage component detecting means for detecting the DC voltage component on the secondary side of the output transformer, and the first and second DC voltage detecting means. A control device for a power converter, comprising control means for comparing the DC voltage component signals and controlling the inverse power converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3323507A JPH05161363A (en) | 1991-12-09 | 1991-12-09 | Controller for power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3323507A JPH05161363A (en) | 1991-12-09 | 1991-12-09 | Controller for power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05161363A true JPH05161363A (en) | 1993-06-25 |
Family
ID=18155465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3323507A Pending JPH05161363A (en) | 1991-12-09 | 1991-12-09 | Controller for power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05161363A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014077281A1 (en) * | 2012-11-15 | 2014-05-22 | 日立オートモティブシステムズ株式会社 | Power conversion apparatus |
-
1991
- 1991-12-09 JP JP3323507A patent/JPH05161363A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014077281A1 (en) * | 2012-11-15 | 2014-05-22 | 日立オートモティブシステムズ株式会社 | Power conversion apparatus |
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