JP4242053B2 - Active filter - Google Patents

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Publication number
JP4242053B2
JP4242053B2 JP2000305750A JP2000305750A JP4242053B2 JP 4242053 B2 JP4242053 B2 JP 4242053B2 JP 2000305750 A JP2000305750 A JP 2000305750A JP 2000305750 A JP2000305750 A JP 2000305750A JP 4242053 B2 JP4242053 B2 JP 4242053B2
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Japan
Prior art keywords
output
voltage
signal
phase
wave generator
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JP2000305750A
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JP2002118966A (en
Inventor
和男 末包
聡 山本
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Sansha Electric Manufacturing Co Ltd
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Sansha Electric Manufacturing Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Supply And Distribution Of Alternating Current (AREA)
  • Power Conversion In General (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は，アクティブフィルタに関するものである。
【０００２】
【従来の技術】
図３は，一般に用いられるアクティブフィルタを示す回路図である。同図において，１は３相交流電源で，２は負荷である。３はアクティブフィルタであり，３相ブリッジで構成のダイオード４ａ，４ｂ，４ｃ，４ｄ，４ｅ，４ｆにより整流する整流部４と，各ダイオード４ａ，４ｂ，４ｃ，４ｄ，４ｅ，４ｆと逆並列に接続されたＩＧＢＴ，ＭＯＳＦＥＴ，バイポーラトランジスタ等のトランジスタ５ａ，５ｂ，５ｃ，５ｄ，５ｅ，５ｆがブリッジインバータを構成するトランジスタスイッチ５と，整流部４の入力に設けられたリアクトル６ａ，６ｂ，６ｃと，整流部４の直流出力に設けられたコンデンサ７により構成されている。上記トランジスタ５ａ〜５ｆは，制御装置８ａのゲート信号により駆動され制御される。
【０００３】
１１はアクティブフィルタの出力の交流電圧位相を検出する出力電圧位相検出器，１２は制御装置８ａに内蔵する正弦波発生装置で基準信号となり，出力電圧検出器１１の検出信号と比較され，その誤差が誤差増幅器１５により増幅される。誤差増幅された信号は，正弦波発生装置の基準信号を加算器１６ａ，１６ｂ，１６ｃにより加算される。１３は高周波の三角波を発生する三角波発生装置で，この三角波発生装置１３の三角波をキャリア信号として，加算器１６ａ，１６ｂ，１６ｃで加算された信号とをＰＷＭ波形形成回路１７により比較し，オンオフするＰＷＭ波形信号を形成する。このＰＷＭ波形信号をトランジスタスイッチ５のトランジスタ５ａ〜５ｆのゲート信号とし，トランジスタスイッチ５を制御させる。その結果，正弦波発生装置１２の指令信号に追従する正弦波電圧を負荷２に印加することができる。
【０００４】
【発明が解決しようとする課題】
ところが，３相交流電源１の電圧が３相全て同じ電圧でなく，不平衡である場合，交流電源に応じた電源が負荷に供給できないという問題があった。
【０００５】
【課題を解決するための手段】
本発明のアクティブフィルタは，３相交流電源から電力を供給する負荷に，交流出力側を接続したブリッジ構成のトランジスタスイッチと，上記トランジスタスイッチと逆並列に接続されたブリッジ構成の整流部と，上記整流部の出力に設けられたコンデンサと，上記負荷に供給される電力に応じて上記トランジスタスイッチの交流出力を制御する制御部からなり，上記制御部が負荷の入力電圧の位相を検出する出力電圧位相検出器と，３相の交流電圧を出力する正弦波発生装置と，上記出力電圧位相検出器の検出信号と，上記正弦波発生装置の出力を基準電圧とする信号との誤差を増幅する誤差増幅器と，高周波の三角波を出力とする三角波発生装置と，上記誤差増幅器の出力信号と上記三角波発生装置の出力とを比較し，上記トランジスタスイッチをオンオフ制御するＰＷＭ波形成形回路とを備えたアクティブフィルタにおいて，上記コンデンサの直流電圧を検出する直流電圧検出器と，上記直流電圧検出器により検出された検出信号と，上記三角波発生装置の三角波とを掛け算し，上記誤差増幅器の出力信号と比較するキャリア信号を出力する掛算器を備えたものである。
【０００６】
すなわち，３相交流電源が整流部により整流され，整流部の出力のコンデンサを充電する。整流部と逆並列に設けられたトランジスタスイッチは，制御部のＰＷＭ波形信号により制御され，コンデンサの充電電荷から負荷に電力を供給する。
【０００７】
一方，負荷に印加する電圧位相を出力電圧位相検出器により検出し，この検出信号と内蔵する正弦波発生装置の正弦波の電圧基準信号の位相との誤差が誤差増幅器により増幅される。また，三角波発生装置から出力される高周波の三角波と，直流電圧検出器により検出された上記コンデンサの直流電圧の検出信号とを掛算器により掛け算し，高周波のキャリア信号とする。そして，誤差増幅器の増幅信号と掛算器のキャリア信号とがＰＷＭ波形成形回路により比較され，ＰＷＭ波形信号が形成される。このＰＷＭ波形信号によりトランジスタスイッチが制御され，３相交流電源の不平衡分に応じた電力を負荷に供給することができる。
【０００８】
【発明の実施の形態】
次に本発明を，実施の形態を示す図１に基づき説明する。図１において１は，３相交流電源で，２は負荷である。３はアクティブフィルタであり，３相ブリッジで構成のダイオード４ａ，４ｂ，４ｃ，４ｄ，４ｅ，４ｆにより整流する整流部４と，各ダイオード４ａ，４ｂ，４ｃ，４ｄ，４ｅ，４ｆと並列に接続されたＩＧＢＴ，ＭＯＳＦＥＴ，バイポーラトランジスタ等のトランジスタ５ａ，５ｂ，５ｃ，５ｄ，５ｅ，５ｆがブリッジインバータを構成するトランジスタスイッチ５と，整流部４の入力に設けられたリアクトル６ａ，６ｂ，６ｃと，整流部４の直流出力に設けられたコンデンサ７により構成されている。上記トランジスタ５ａ〜５ｆは制御部８のゲート信号により駆動され制御される。
【０００９】
１１はアクティブフィルタの出力交流電圧位相を検出する出力電圧位相検出器，１２は制御部８に内蔵する正弦波発生装置で基準信号となり，出力電圧検出器１１の検出信号と比較され，その誤差が誤差増幅器１５により増幅される。誤差増幅された信号は，正弦波発生装置の基準信号を加算器１６ａ，１６ｂ，１６ｃにより加算される。１３は高周波の三角波を発生する三角波発生装置である。
【００１０】
２１はコンデンサ７の直流電圧を検出する直流電圧検出器で，直流電圧検出器２１で検出された検出信号と，三角波発生装置１３の三角波を掛算器２２により掛け算する。コンデンサ７の直流電圧は，３相交流電源１の不平衡電圧に応じてリップルを有しており，図２に示すように掛算器２２の出力には，リップルに応じた三角波のキャリア信号が出力されることになる。そして，三角波のキャリア信号と，加算器１６ａ，１６ｂ，１６ｃにより加算された信号とがＰＷＭ波形形成回路１７により比較され，ＰＷＭ波形信号が形成される。このＰＷＭ波形成形信号をトランジスタスイッチ５のトランジスタ５ａ〜５ｆのゲート信号とし，トランジスタスイッチ５を制御させる。その結果，３相交流電源のわずかな不平衡にも応じた正弦波電圧を負荷に印加することができる。
【００１１】
【発明の効果】
本発明のアクティブフィルタによれば，３相交流電源に応じた不平衡に応じた正弦波電圧を負荷に供給することができる。
【図面の簡単な説明】
【図１】本発明のアクティブフィルタの一実施の形態を示すブロック図である。
【図２】図１の掛算器の出力波形図である。
【図３】従来のアクティブフィルタのブロック図である。
【符号の説明】
１ ３相交流電源
２ 負荷
３ アクティブフィルタ
４ 整流部
５ トランジスタスイッチ
７ コンデンサ
８ 制御部
１１ 出力電圧位相検出器
１２ 正弦波発生装置
１３ 三角波発生装置
１５ 誤差増幅器
１６ａ，１６ｂ，１６ｃ 加算器
１７ ＰＷＭ波形成形回路
２１ 直流電圧検出器
２２ 掛算器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an active filter.
[0002]
[Prior art]
FIG. 3 is a circuit diagram showing an active filter generally used. In the figure, 1 is a three-phase AC power source and 2 is a load. Reference numeral 3 denotes an active filter, which is rectified by diodes 4a, 4b, 4c, 4d, 4e, and 4f constituted by a three-phase bridge, and in reverse parallel to the diodes 4a, 4b, 4c, 4d, 4e, and 4f. Transistors 5a, 5b, 5c, 5d, 5e, and 5f such as IGBTs, MOSFETs, and bipolar transistors connected to each other constitute a transistor switch 5 that constitutes a bridge inverter, and reactors 6a, 6b, and 6c provided at the input of the rectifying unit 4. , And a capacitor 7 provided at the DC output of the rectifying unit 4. The transistors 5a to 5f are driven and controlled by the gate signal of the control device 8a.
[0003]
Reference numeral 11 is an output voltage phase detector for detecting the AC voltage phase of the output of the active filter, and 12 is a sine wave generator built in the control device 8a, which serves as a reference signal and is compared with the detection signal of the output voltage detector 11, and its error. Is amplified by the error amplifier 15. The error amplified signal is added to the reference signal of the sine wave generator by the adders 16a, 16b, and 16c. Reference numeral 13 denotes a triangular wave generator that generates a high-frequency triangular wave. The triangular wave of the triangular wave generator 13 is used as a carrier signal, and the signals added by the adders 16a, 16b, and 16c are compared by the PWM waveform forming circuit 17 and turned on / off. A PWM waveform signal is formed. This PWM waveform signal is used as the gate signal of the transistors 5 a to 5 f of the transistor switch 5 to control the transistor switch 5. As a result, a sine wave voltage that follows the command signal of the sine wave generator 12 can be applied to the load 2.
[0004]
[Problems to be solved by the invention]
However, when the voltages of the three-phase AC power source 1 are not the same voltage in all three phases and are unbalanced, there is a problem that power corresponding to the AC power source cannot be supplied to the load.
[0005]
[Means for Solving the Problems]
An active filter according to the present invention includes a bridge-structured transistor switch in which an AC output side is connected to a load that supplies power from a three-phase AC power supply, a bridge-structured rectifier connected in antiparallel with the transistor switch, A capacitor provided at the output of the rectifier unit and a control unit that controls the AC output of the transistor switch according to the power supplied to the load, and the control unit detects the phase of the input voltage of the load. An error that amplifies an error between a phase detector, a sine wave generator that outputs a three-phase AC voltage, a detection signal of the output voltage phase detector, and a signal that uses the output of the sine wave generator as a reference voltage An amplifier, a triangular wave generator that outputs a high-frequency triangular wave, and the output signal of the error amplifier and the output of the triangular wave generator are compared; In an active filter having a PWM waveform shaping circuit for on / off control of a switch, a DC voltage detector for detecting a DC voltage of the capacitor, a detection signal detected by the DC voltage detector, and a triangular wave of the triangular wave generator And a multiplier for outputting a carrier signal to be compared with the output signal of the error amplifier.
[0006]
That is, the three-phase AC power supply is rectified by the rectification unit, and the capacitor at the output of the rectification unit is charged. The transistor switch provided in antiparallel with the rectifying unit is controlled by the PWM waveform signal of the control unit and supplies power to the load from the charge of the capacitor.
[0007]
On the other hand, the voltage phase applied to the load is detected by an output voltage phase detector, and an error between the detected signal and the phase of the sine wave voltage reference signal of the built-in sine wave generator is amplified by an error amplifier. The high frequency triangular wave output from the triangular wave generator and the DC voltage detection signal of the capacitor detected by the DC voltage detector are multiplied by a multiplier to obtain a high frequency carrier signal. Then, the amplified signal of the error amplifier and the carrier signal of the multiplier are compared by a PWM waveform shaping circuit to form a PWM waveform signal. The transistor switch is controlled by this PWM waveform signal, and power corresponding to the unbalanced portion of the three-phase AC power supply can be supplied to the load.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described based on FIG. 1 showing an embodiment. In FIG. 1, 1 is a three-phase AC power source and 2 is a load. Reference numeral 3 denotes an active filter, which is connected in parallel with the rectifying unit 4 rectified by the diodes 4a, 4b, 4c, 4d, 4e, and 4f configured by a three-phase bridge, and the diodes 4a, 4b, 4c, 4d, 4e, and 4f. Transistors 5a, 5b, 5c, 5d, 5e, 5f such as IGBTs, MOSFETs, bipolar transistors, etc., that constitute a bridge inverter, and reactors 6a, 6b, 6c provided at the input of the rectifying unit 4, The capacitor 7 is provided with a DC output of the rectifying unit 4. The transistors 5a to 5f are driven and controlled by the gate signal of the control unit 8.
[0009]
Reference numeral 11 is an output voltage phase detector for detecting the output AC voltage phase of the active filter, and 12 is a sine wave generator built in the control unit 8, which serves as a reference signal and is compared with the detection signal of the output voltage detector 11, and its error is Amplified by the error amplifier 15. The error amplified signal is added to the reference signal of the sine wave generator by the adders 16a, 16b, and 16c. A triangular wave generator 13 generates a high-frequency triangular wave.
[0010]
Reference numeral 21 denotes a DC voltage detector that detects the DC voltage of the capacitor 7, and a multiplier 22 multiplies the detection signal detected by the DC voltage detector 21 and the triangular wave of the triangular wave generator 13. The DC voltage of the capacitor 7 has a ripple corresponding to the unbalanced voltage of the three-phase AC power supply 1, and a triangular wave carrier signal corresponding to the ripple is output at the output of the multiplier 22 as shown in FIG. Will be. Then, the triangular wave carrier signal and the signals added by the adders 16a, 16b, and 16c are compared by the PWM waveform forming circuit 17 to form a PWM waveform signal. This PWM waveform shaping signal is used as the gate signal of the transistors 5a to 5f of the transistor switch 5, and the transistor switch 5 is controlled. As a result, a sine wave voltage corresponding to a slight unbalance of the three-phase AC power supply can be applied to the load.
[0011]
【The invention's effect】
According to the active filter of the present invention, it is possible to supply a sine wave voltage corresponding to the unbalance according to the three-phase AC power supply to the load.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an active filter according to an embodiment of the present invention.
2 is an output waveform diagram of the multiplier of FIG. 1; FIG.
FIG. 3 is a block diagram of a conventional active filter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 3 phase alternating current power supply 2 Load 3 Active filter 4 Rectification part 5 Transistor switch 7 Capacitor 8 Control part 11 Output voltage phase detector 12 Sine wave generator 13 Triangular wave generator 15 Error amplifier 16a, 16b, 16c Adder 17 PWM waveform shaping Circuit 21 DC voltage detector 22 Multiplier

Claims (1)

３相交流電源から電力を供給する負荷に，交流出力側を接続したブリッジ構成のトランジスタスイッチと，上記トランジスタスイッチと逆並列に接続されたブリッジ構成の整流部と，上記整流部の出力に設けられたコンデンサと，上記負荷に供給される電力に応じて上記トランジスタスイッチの交流出力を制御する制御部からなり，上記制御部が負荷の入力電圧の位相を検出する出力電圧位相検出器と，３相の交流電圧を出力する正弦波発生装置と，上記出力電圧位相検出器の検出信号と，上記正弦波発生装置の出力を基準電圧とする信号との誤差を増幅する誤差増幅器と，高周波の三角波を出力とする三角波発生装置と，上記誤差増幅器の出力信号と上記三角波発生装置の出力とを比較し，上記トランジスタスイッチをオンオフ制御するＰＷＭ波形成形回路とを備えたアクティブフィルタにおいて，上記コンデンサの直流電圧を検出する直流電圧検出器と，上記直流電圧検出器により検出された検出信号と，上記三角波発生装置の三角波とを掛け算し，上記誤差増幅器の出力信号と比較するキャリア信号を出力する掛算器を備えたことを特徴とするアクティブフィルタ。A bridge-structured transistor switch with the AC output connected to a load that supplies power from a three-phase AC power source, a bridge-structured rectifier connected in antiparallel with the transistor switch, and an output of the rectifier And an output voltage phase detector for detecting the phase of the input voltage of the load, and a three-phase control circuit, wherein the control unit controls the AC output of the transistor switch according to the power supplied to the load. A sinusoidal wave generator for outputting an AC voltage of the above, an error amplifier for amplifying an error between a detection signal of the output voltage phase detector and a signal having the output of the sine wave generator as a reference voltage, A triangular wave generator for output, and an output signal of the error amplifier and the output of the triangular wave generator are compared, and the transistor switch is turned on / off. In an active filter having an M waveform shaping circuit, a DC voltage detector for detecting a DC voltage of the capacitor, a detection signal detected by the DC voltage detector, and a triangular wave of the triangular wave generator are multiplied. An active filter comprising a multiplier for outputting a carrier signal to be compared with an output signal of the error amplifier.
JP2000305750A 2000-10-05 2000-10-05 Active filter Expired - Fee Related JP4242053B2 (en)

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JP4242053B2 true JP4242053B2 (en) 2009-03-18

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