JPH0568341A - Active filter - Google Patents

Active filter

Info

Publication number
JPH0568341A
JPH0568341A JP3227077A JP22707791A JPH0568341A JP H0568341 A JPH0568341 A JP H0568341A JP 3227077 A JP3227077 A JP 3227077A JP 22707791 A JP22707791 A JP 22707791A JP H0568341 A JPH0568341 A JP H0568341A
Authority
JP
Japan
Prior art keywords
current
value
target value
active filter
compensation
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
Application number
JP3227077A
Other languages
Japanese (ja)
Inventor
Hidetaka Kidoguchi
秀隆 木戸口
Kazunari Komatsugi
和成 小松木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP3227077A priority Critical patent/JPH0568341A/en
Publication of JPH0568341A publication Critical patent/JPH0568341A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)

Abstract

PURPOSE:To more increase the higher harmonics compensating performance of an active filter for the system. CONSTITUTION:There has been a problem that since the system is controlled using as a compensation current target value for harmonic current a difference between a load current actual value IL and a system current target value IS* which is determined by a calculator 122 from the load current actual value, the control-following property or a control error appears as harmonic current of the system current as it is and therefore harmonics are not sufficiently compensated in the system. Then, a system current actual value IS is detected by a detector 5 and the system is controlled using a compensation current target value IC* which is the conventional compensation current target value plus a difference between the detected system current actual value IS and the system current target value. By this method, harmonic current remaining in the system power source is more decreased.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、負荷の要求する高調
波電流を供給して電源系統からの電流の歪みを低減す
る、いわゆるアクティブフィルタに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called active filter which supplies a harmonic current required by a load to reduce distortion of current from a power supply system.

【0002】[0002]

【従来の技術】従来、負荷の要求する高調波電流を供給
して電源系統からの電流の歪みを低減するアクティブフ
ィルタは、例えば特公昭53−34828号公報等によ
り公知である。図4はアクティブフィルタを用いた給電
方式を示す概要図、図5はアクティブフィルタの従来例
を示す構成図である。図4に示すように、アクティブフ
ィルタ1は系統と負荷2との間に設けられ、負荷電流I
L に含まれる無効電流を補償するための補償電流IC
供給し、これによって電源系統電流IS に無効電流成分
を含まないようにする。このために、所要の補償電流I
C を模擬したパルス幅変調(PWM)信号がアクティブ
フィルタ1から取り出される。なお、同図の3は負荷電
流検出器、4は高調波電流(補償電流)検出器であり、
L1,L2およびC1はフィルタを構成している。
2. Description of the Related Art Conventionally, an active filter for supplying a harmonic current required by a load to reduce distortion of current from a power supply system is known, for example, from Japanese Patent Publication No. 53-34828. FIG. 4 is a schematic diagram showing a power feeding system using an active filter, and FIG. 5 is a configuration diagram showing a conventional example of the active filter. As shown in FIG. 4, the active filter 1 is provided between the system and the load 2, and the load current I
A compensation current I C for compensating the reactive current contained in L is supplied so that the power system current I S does not contain a reactive current component. For this purpose, the required compensation current I
A pulse width modulation (PWM) signal simulating C is taken out from the active filter 1. In the figure, 3 is a load current detector, 4 is a harmonic current (compensation current) detector,
L1, L2 and C1 form a filter.

【0003】アクティブフィルタ1は具体的には例えば
図5に示すように、大きくはインバータ等の可制御スイ
ッチ部11と、制御部12とから構成される。そして、
可制御スイッチ部11はIGBT(絶縁ゲートバイポー
ラモードトランジスタ)を含むトランジスタ等のスイッ
チング素子T、帰還ダイオードDおよび平滑コンデンサ
Cなどから構成される。また、制御部12は基本波成分
演算器121、電流調節器(ACR)123、パルス幅
変調(PWM)回路124、三角波発生器125および
加減算器(または比較器)126,127などから構成
される。すなわち、負荷電流検出器3によって検出され
た負荷電流実際値IL は基本波成分演算器121に導か
れて電源電流目標値IS * が算出され、電源電流実際値
S がこの目標値IS * に一致するように、アクティブ
フィルタ1からの補償電流IC が調節される。また、加
減算器126では検出器3からの負荷電流実際値I
L と、演算器121からの系統電流目標値IS * との
差、つまりIL −IS * が形成され、この差が補償電流
目標値IC * ’として、加減算器127において補償電
流検出器4からの補償電流実際値IC と比較される。加
減算器127において形成された偏差はACR123に
与えられ、ここで補償電流実際値IC がその目標値IC
* ’に一致するよう所定の制御演算が行なわれる。AC
R123の出力はPWM回路124に導かれ、ここで三
角波発生器125の出力と比較することにより、所要の
補償電流に対応するPWM信号が形成され、これにもと
づき可制御スイッチ部11の個々のスイッチング素子T
のオン,オフを制御することにより、補償電流IC を得
ることができる。なお、この補償電流IC は図4のフィ
ルタにて正弦波に整形され系統に与えられる。
Specifically, the active filter 1 is mainly composed of a controllable switch section 11 such as an inverter and a control section 12, as shown in FIG. And
The controllable switch unit 11 includes a switching element T such as a transistor including an IGBT (insulated gate bipolar mode transistor), a feedback diode D, and a smoothing capacitor C. The control unit 12 includes a fundamental wave component calculator 121, a current regulator (ACR) 123, a pulse width modulation (PWM) circuit 124, a triangular wave generator 125, and adder / subtractors (or comparators) 126 and 127. .. That is, the load current actual value I L detected by the load current detector 3 is guided to the fundamental wave component calculator 121 to calculate the power supply current target value I S * , and the power supply current actual value I S is the target value I S. The compensation current I C from the active filter 1 is adjusted to match S * . Further, in the adder / subtractor 126, the actual load current value I from the detector 3
A difference between L and the system current target value I S * from the arithmetic unit 121, that is, I L −I S * is formed, and this difference is used as a compensation current target value I C * 'in the adder / subtractor 127 to detect the compensation current. It is compared with the actual compensation current value I C from the device 4. The deviation formed in the adder / subtractor 127 is applied to the ACR 123, where the actual compensation current value I C is its target value I C.
Predetermined control operation is performed so as to match " * ". AC
The output of R123 is guided to the PWM circuit 124, and by comparing it with the output of the triangular wave generator 125, the PWM signal corresponding to the required compensation current is formed, and based on this, the individual switching of the controllable switch unit 11 is switched. Element T
The compensation current I C can be obtained by controlling the on / off of. The compensation current I C is shaped into a sine wave by the filter of FIG. 4 and given to the system.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上述の
如く負荷電流を検出し、その負荷電流に含まれる高調波
電流分を演算してアクティブフィルタの流すべき電流の
指令値として制御する負荷電流検出方式においては、負
荷電流に含まれる高調波電流成分を電流指令値としてい
るため、制御の追従性や制御エラーがそのまま系統電流
の高調波電流として現れ、系統での高調波補償が充分に
行なえないという問題がある。したがって、この発明の
課題は高調波補償性能を従来よりも向上させることにあ
る。
However, as described above, the load current detection system detects the load current, calculates the harmonic current component contained in the load current, and controls it as the command value of the current to be passed through the active filter. In the above, since the harmonic current component included in the load current is used as the current command value, the control followability and control error appear as the harmonic current of the system current as they are, and the harmonic compensation in the system cannot be sufficiently performed. There's a problem. Therefore, an object of the present invention is to improve the harmonic compensation performance as compared with the prior art.

【0005】[0005]

【課題を解決するための手段】かかる課題を解決するた
め、この発明では、負荷の要求する高調波電流を供給し
て電源系統からの電流の歪みを除去するためのアクティ
ブフィルタであって、インバータを含む可制御スイッチ
と、負荷電流実際値から電源系統の電流目標値を演算
し、この演算値と負荷電流実際値との差を補償電流目標
値とし、かつ前記アクティブフィルタが発生する電流を
補償電流実際値として両者の偏差に応じて前記可制御ス
イッチを制御するフィードバック制御回路とを少なくと
も有してなるアクティブフィルタにおいて、電源系統の
電流を検出し、この系統電流実際値と前記演算された電
源系統の電流目標値との偏差を、前記補償電流の目標値
に加算して制御することを特徴としている。
In order to solve such a problem, the present invention provides an active filter for supplying a harmonic current required by a load to remove distortion of a current from a power supply system. Controllable switch that includes a controllable switch and a load current actual value to calculate the current target value of the power supply system, the difference between this calculated value and the load current actual value is used as the compensation current target value, and the current generated by the active filter is compensated. In an active filter having at least a feedback control circuit for controlling the controllable switch according to the deviation between the two as a current actual value, the current of the power system is detected, and the system current actual value and the calculated power source It is characterized in that the deviation from the current target value of the system is added to the target value of the compensation current for control.

【0006】[0006]

【作用】従来の負荷電流検出方式におけるアクティブフ
ィルタの電流指令に対し、系統電流の目標値と実際値と
の偏差を増幅,加算して電流指令とすることにより、従
来方式では充分に補償できなかった高調波電流成分を低
減する。
In the conventional load current detection method, the current command of the active filter is amplified and the deviation between the target value and the actual value of the system current is amplified and added to obtain the current command, which cannot be sufficiently compensated by the conventional method. The harmonic current component is reduced.

【0007】[0007]

【実施例】図1にこの発明の実施例を示す。同図からも
明らかなように、この実施例は制御部12に系統電流検
出器5からの系統電流実際値IS を導入し、加減算器1
28においてこれと負荷電流より系統電流の目標値を演
算する演算器121からの出力である系統電流目標値と
の偏差を求め、増幅器122によって増幅したのち加減
算器126に与えるようにした点が特徴である。このた
め、図2に示すように系統側には系統電流を検出するた
めの検出器5が設けられる。なお、その他の点は図4,
図5と全く同様である。以下、図3も参照して従来例と
異なる点を主として説明する。基本波成分演算器121
は検出器3を介して与えられる負荷電流実際値IL
り、図3(イ)の如き系統電流目標値IS * を演算する
が、この点は従来も同様である。しかし、この実施例で
は系統電流実際値とその目標値との偏差を増幅器122
で増幅して得たエラー成分が、加減算器126において
差し引かれることになるので、アクティブフィルタに対
する電流指令値は図3(ハ)の如く、従来のものでは点
線IC * ’となるのに対し、この発明では実線IC *
如くなり、切り替わり点が急峻になる分だけ追従性を改
善することが可能となる。なお、図3(ロ)は系統電流
目標値IS * と、この発明によるものと従来例によるも
のの各系統電流実際値との関係を示すもので、従来のも
のでは系統電流実際値が点線IS ’のように大きくなる
のに対し、この発明ではこれが実線IS のように小さく
なり、波形が改善される様子を示している。
FIG. 1 shows an embodiment of the present invention. As is apparent from the figure, in this embodiment, the actual system current value I S from the system current detector 5 is introduced into the control unit 12, and the adder / subtractor 1
In 28, the difference between this and the target value of the system current, which is the output from the calculator 121 that calculates the target value of the system current from the load current, is obtained, amplified by the amplifier 122, and then given to the adder / subtractor 126. Is. Therefore, as shown in FIG. 2, a detector 5 for detecting a system current is provided on the system side. The other points are shown in FIG.
This is exactly the same as in FIG. Hereinafter, the points different from the conventional example will be mainly described with reference to FIG. Fundamental wave component calculator 121
Calculates the system current target value I S * as shown in FIG. 3A from the actual load current value I L given through the detector 3, but this point is the same as in the prior art. However, in this embodiment, the difference between the actual value of the system current and its target value is calculated by the amplifier 122.
Since the error component obtained by amplification in step (1) is subtracted in the adder / subtractor 126, the current command value for the active filter is the dotted line I C * 'in the conventional one as shown in FIG. According to the present invention, the solid line I C * is obtained, and the followability can be improved by the steep switching point. FIG. 3B shows the relationship between the system current target value I S * and the actual system current values of the present invention and the conventional example. In the conventional system, the actual system current value is the dotted line I. In the present invention, while it becomes large like S ', it becomes small like the solid line I S , and the waveform is improved.

【0008】[0008]

【発明の効果】この発明によれば、系統電流を検出しこ
の検出値とその目標値との偏差を従来の補償電流目標値
に加算して制御するようにしたので、従来の負荷電流検
出方式にて充分に補償し得なかった高調波電流成分を低
減することができる利点が得られる。
According to the present invention, the system current is detected, and the deviation between the detected value and its target value is added to the conventional compensation current target value for control. It is possible to reduce the harmonic current component that could not be sufficiently compensated by.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention.

【図2】この発明が適用されるシステム全体の概要図で
ある。
FIG. 2 is a schematic diagram of an entire system to which the present invention is applied.

【図3】この発明の動作を説明するための波形図であ
る。
FIG. 3 is a waveform diagram for explaining the operation of the present invention.

【図4】従来例が適用されるシステム全体の概要図であ
る。
FIG. 4 is a schematic diagram of an entire system to which a conventional example is applied.

【図5】アクティブフィルタの従来例を示す構成図であ
る。
FIG. 5 is a configuration diagram showing a conventional example of an active filter.

【符号の説明】[Explanation of symbols]

1 アクティブフィルタ 2 負荷 3 負荷電流検出器 4 補償電流検出器 5 系統電流検出器 11 可制御スイッチ部 12 制御部 121 基本波成分演算器 122 増幅器 123 電流調節器(ACR) 124 パルス幅変調(PWM)回路 125 三角波発生器 126 加減算器 127 加減算器 128 加減算器 1 active filter 2 load 3 load current detector 4 compensation current detector 5 system current detector 11 controllable switch unit 12 control unit 121 fundamental wave component calculator 122 amplifier 123 current regulator (ACR) 124 pulse width modulation (PWM) Circuit 125 Triangular wave generator 126 Adder / subtractor 127 Adder / subtractor 128 Adder / subtractor

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 負荷の要求する高調波電流を供給して電
源系統からの電流の歪みを除去するためのアクティブフ
ィルタであって、インバータを含む可制御スイッチと、
負荷電流実際値から電源系統の電流目標値を演算し、こ
の演算値と負荷電流実際値との差を補償電流目標値と
し、かつ前記アクティブフィルタが発生する電流を補償
電流実際値として両者の偏差に応じて前記可制御スイッ
チを制御するフィードバック制御回路とを少なくとも有
してなるアクティブフィルタにおいて、 電源系統の電流を検出し、この系統電流実際値と前記演
算された電源系統の電流目標値との偏差を、前記補償電
流の目標値に加算して制御することを特徴とするアクテ
ィブフィルタ。
1. A controllable switch including an inverter, which is an active filter for supplying a harmonic current required by a load to remove distortion of current from a power supply system,
The target current value of the power supply system is calculated from the actual load current value, the difference between this calculated value and the actual load current value is used as the compensation current target value, and the current generated by the active filter is used as the actual compensation current value. In the active filter having at least a feedback control circuit for controlling the controllable switch according to, the current of the power supply system is detected, and the system current actual value and the calculated current target value of the power supply system An active filter characterized by adding a deviation to a target value of the compensation current to control the deviation.
JP3227077A 1991-09-06 1991-09-06 Active filter Pending JPH0568341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3227077A JPH0568341A (en) 1991-09-06 1991-09-06 Active filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3227077A JPH0568341A (en) 1991-09-06 1991-09-06 Active filter

Publications (1)

Publication Number Publication Date
JPH0568341A true JPH0568341A (en) 1993-03-19

Family

ID=16855156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3227077A Pending JPH0568341A (en) 1991-09-06 1991-09-06 Active filter

Country Status (1)

Country Link
JP (1) JPH0568341A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008306829A (en) * 2007-06-07 2008-12-18 Meidensha Corp Harmonic current compensator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008306829A (en) * 2007-06-07 2008-12-18 Meidensha Corp Harmonic current compensator

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