JPH09233844A - Control circuit of power converter - Google Patents

Control circuit of power converter

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Publication number
JPH09233844A
JPH09233844A JP8042289A JP4228996A JPH09233844A JP H09233844 A JPH09233844 A JP H09233844A JP 8042289 A JP8042289 A JP 8042289A JP 4228996 A JP4228996 A JP 4228996A JP H09233844 A JPH09233844 A JP H09233844A
Authority
JP
Japan
Prior art keywords
value
instantaneous voltage
current
reactor
control circuit
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
JP8042289A
Other languages
Japanese (ja)
Inventor
Ryuji Yamada
隆二 山田
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 JP8042289A priority Critical patent/JPH09233844A/en
Publication of JPH09233844A publication Critical patent/JPH09233844A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To eliminate the unstable operation of a closed loop control system which consists of an LC series circuit and is connected to the output of an inverter. SOLUTION: The differential value of a current (IL) applied to a reactor 3 is obtained by a current differentiating means 21 and the output value of the current differentiating means 21 is deducted from the sum of an instantaneous voltage command value (VIN) and the output value of an instantaneous voltage adjusting means 13. A PWM control means 22 carries out a PWM calculation in accordance with the deduction result to increase the equivalent inductance value of the reactor 3 in the closed loop control system of a power converter and the stabilized operation of the control system can be realized.

Description

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

【0001】[0001]

【発明の属する技術分野】この発明は、無停電電源装置
などに供用される電力変換装置としての瞬時値制御形P
WMインバータ装置の制御回路に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instantaneous value control type P as a power converter used for an uninterruptible power supply or the like.
The present invention relates to a control circuit of a WM inverter device.

【0002】[0002]

【従来の技術】図5は、この種の電力変換装置の制御回
路の従来例を示す回路構成図である。図5において、1
は直流電源、2は電力用半導体デバイスである、例え
ば、IGBT,ダイオードなどからなるインバータ、3
はリアクトル、4はコンデンサ、5は負荷、10は制御
回路である。
2. Description of the Related Art FIG. 5 is a circuit configuration diagram showing a conventional example of a control circuit for a power converter of this type. In FIG. 5, 1
Is a DC power supply, 2 is a power semiconductor device, for example, an inverter composed of IGBT, diode, etc., 3
Is a reactor, 4 is a capacitor, 5 is a load, and 10 is a control circuit.

【0003】図5に示す制御回路10は、コンデンサ4
の両端の交流電圧を検出する電圧検出手段11と、任意
の波形の瞬時電圧指令値(VIN)を出力する瞬時電圧指
令値発生手段12と、瞬時電圧指令値(VIN)と電圧検
出手段12の出力値との偏差を調節演算する瞬時電圧調
節手段13と、瞬時電圧指令値(VIN)と瞬時電圧調節
手段13の出力値とを加算演算した加算値を求め、この
加算値に基づくPWM(パルス幅変調)演算したゲート
信号によりインバータ2の電力用半導体デバイスをオン
・オフ制御するPWM制御手段14とを備えている。
The control circuit 10 shown in FIG.
, An instantaneous voltage command value generating means 12 for outputting an instantaneous voltage command value (V IN ) of an arbitrary waveform, an instantaneous voltage command value (V IN ) and a voltage detecting means And an instantaneous voltage adjusting means 13 for adjusting and calculating a deviation from the output value of the output value 12. An addition value obtained by adding and calculating the instantaneous voltage command value (V IN ) and the output value of the instantaneous voltage adjusting means 13 is obtained, and based on the added value. PWM control means 14 for controlling the power semiconductor device of the inverter 2 to be turned on / off by a gate signal calculated by PWM (pulse width modulation).

【0004】図5に示した電力変換装置の制御回路10
の動作を以下に説明する。瞬時電圧指令値発生手段12
の出力である、例えば正弦波状の瞬時電圧指令値
(VIN)と、コンデンサ4の両端の交流電圧(VOUT
の電圧検出手段11の検出値との偏差が零になるように
瞬時電圧調節手段13が動作をし、このために瞬時電圧
調節手段13が該偏差の比例演算または比例・積分演算
などの調節演算をしてインバータ2の電力用半導体デバ
イスおよびリアクトル3の電圧降下などの瞬時補正値を
出力し、該瞬時補正値と瞬時電圧指令値(VIN)との加
算値に基づくPWM演算したゲート信号の生成をPWM
制御手段14で行い、このゲート信号によりインバータ
2の電力用半導体デバイスをオン・オフ制御し、インバ
ータ2が出力した電圧パルス列波形からLC直列回路で
あるリアクトル3とコンデンサ4により高周波成分を除
去することにより、VINとほぼ相似形のVOUT にして負
荷5に供給している。
The control circuit 10 of the power converter shown in FIG.
The operation of is described below. Instantaneous voltage command value generating means 12
, For example, a sinusoidal instantaneous voltage command value (V IN ) and an AC voltage (V OUT ) across the capacitor 4
The instantaneous voltage adjusting means 13 operates so that the deviation from the detection value of the voltage detecting means 11 becomes zero. Therefore, the instantaneous voltage adjusting means 13 adjusts the deviation by proportional operation or proportional / integral operation. To output an instantaneous correction value such as a voltage drop of the power semiconductor device of the inverter 2 and the reactor 3, and calculate a PWM signal based on the sum of the instantaneous correction value and the instantaneous voltage command value (V IN ). Generate PWM
The control means 14 controls ON / OFF of the power semiconductor device of the inverter 2 by this gate signal, and removes high frequency components from the voltage pulse train waveform output from the inverter 2 by the reactor 3 and the capacitor 4 which are LC series circuits. Thus, V OUT , which is almost similar to V IN , is supplied to the load 5.

【0005】[0005]

【発明が解決しようとする課題】図6は、図5に示した
電力変換装置を伝達関数で表したブロック線図である。
図6において、伝達関数ブロック51はインバータ2と
瞬時電圧調節手段13とPWM制御手段14とを一括し
て伝達関数表示したもので、K1 は瞬時電圧調節手段1
3の比例ゲインであり、ε-Ts はPWM制御手段14の
キャリア周期に基づく無駄時間の伝達関数表示であり、
伝達関数ブロック52はリアクトル3の伝達関数表示の
逆数であり、伝達関数ブロック53はコンデンサ4の伝
達関数表示である。
FIG. 6 is a block diagram showing the power conversion device shown in FIG. 5 by a transfer function.
In FIG. 6, a transfer function block 51 is a transfer function display of the inverter 2, the instantaneous voltage adjusting means 13, and the PWM control means 14, and K 1 is the instantaneous voltage adjusting means 1.
3 is a proportional gain, and ε- Ts is a transfer function display of dead time based on the carrier cycle of the PWM control means 14,
The transfer function block 52 is the reciprocal of the transfer function display of the reactor 3, and the transfer function block 53 is the transfer function display of the capacitor 4.

【0006】先述の瞬時電圧指令値(VIN)とコンデン
サ4の両端の交流電圧(VOUT )とがほぼ相似形にして
負荷5に供給するためには、瞬時電圧調節手段13の比
例ゲインK1 をできるだけ高くすることが要求される
が、リアクトル3とコンデンサ4からなるLC直列回路
は、周知の如く、sL,sCによる2次系の伝達関数で
あり、前記LC直列回路はインバータ2が出力した電圧
パルス列波形の高周波成分を除去するための定数にそれ
ぞれ設定された結果、図6に示したこの電力変換器の閉
ループ制御系が不安定になるという問題があり、従来は
この問題の解決策として該LC直列回路の共振周波数
(ω,ω=(LC)-1/2)を低くする、すなわちリアク
トル3またはコンデンサ4の値を大きくしていたが、こ
の解決策ではリアクトル3またはコンデンサ4が大型に
なり、その結果、電力変換装置が大型化し、高価になる
という難点があった。
In order to supply the load 5 with the above-mentioned instantaneous voltage command value (V IN ) and the AC voltage (V OUT ) across the capacitor 4 which are substantially similar to each other, the proportional gain K of the instantaneous voltage adjusting means 13 is required. Although it is required to make 1 as high as possible, as is well known, the LC series circuit composed of the reactor 3 and the capacitor 4 is a secondary transfer function of sL and sC, and the LC series circuit outputs the inverter 2 As a result of setting the constants for removing the high frequency components of the voltage pulse train waveform, there is a problem that the closed loop control system of the power converter shown in FIG. 6 becomes unstable. as the LC series circuit of the resonance frequency (ω, ω = (LC) -1/2) a lower, ie had a larger value of the reactor 3 or the capacitors 4, the reactor in this solution Or capacitor 4 becomes large, so that the power converter becomes large in size, there is a drawback that expensive.

【0007】この発明の課題は、上記難点を解決する電
力変換装置の制御回路を提供することにある。
An object of the present invention is to provide a control circuit of a power conversion device that solves the above-mentioned difficulties.

【0008】[0008]

【課題を解決するための手段】この発明は、インバータ
の出力にリアクトルとコンデンサからなるLC直列回路
を接続し、該コンデンサの両端に接続された負荷に交流
電力を供給する電力変換装置の制御回路において、前記
コンデンサの両端の電圧を検出する電圧検出手段と、前
記リアクトルの電流を検出し、この検出値の微分量を演
算して出力する電流微分手段と、任意の波形の瞬時電圧
指令値を出力する瞬時電圧指令値発生手段と、瞬時電圧
指令値と電圧検出手段の出力値との偏差を調節演算する
瞬時電圧調節手段と、瞬時電圧指令値と瞬時電圧調節手
段の出力値とを加算演算した加算値から電流微分手段の
出力値を減算演算した減算値を求め、この減算値に基づ
くPWM演算したゲート信号により前記インバータを構
成する電力用半導体デバイスをオン・オフ制御するPW
M制御手段とを備える。
The present invention relates to a control circuit for a power converter which connects an LC series circuit consisting of a reactor and a capacitor to the output of an inverter and supplies AC power to a load connected to both ends of the capacitor. In, the voltage detecting means for detecting the voltage across the capacitor, the current differentiating means for detecting the current of the reactor, calculating the differential amount of the detected value and outputting, and the instantaneous voltage command value of an arbitrary waveform. The instantaneous voltage command value generating means for outputting, the instantaneous voltage adjusting means for adjusting and calculating the deviation between the instantaneous voltage command value and the output value of the voltage detecting means, and the adding operation for the instantaneous voltage command value and the output value of the instantaneous voltage adjusting means The subtracted value obtained by subtracting the output value of the current differentiating means from the added value is obtained, and the gate signal subjected to the PWM operation based on the subtracted value is used for the power semiconductor forming the inverter. PW to turn on and off control of the device
M control means.

【0009】この発明によれば、後述の如く、この電力
変換装置の制御回路に電流微分手段を設けることにより
等価的に大きな値のリアクトルにできるので、閉ループ
制御系の安定動作を維持しつつ、瞬時電圧調節手段の比
例ゲインを高くすることが可能である。
According to the present invention, as will be described later, the reactor having a large value can be equivalently provided by providing the current differentiating means in the control circuit of this power converter, so that the stable operation of the closed loop control system can be maintained, It is possible to increase the proportional gain of the instantaneous voltage adjusting means.

【0010】[0010]

【発明の実施の形態】図1は、この発明の実施例を示す
電力変換装置の制御回路の回路構成図であり、図5に示
した従来例と同一機能を有するものは同一符号を付して
その説明を省略する。すなわち図1において、この電力
変換装置の制御回路20には、電圧検出手段11,瞬時
電圧指令値発生手段12,瞬時電圧調節手段13の他
に、リアクトル3の交流電流(IL )をCT6を介して
検出し、この検出値の微分量を演算して出力する電流微
分手段21と、前記瞬時電圧指令値(VIN)と瞬時電圧
調節手段13の出力値とを加算演算した加算値から電流
微分手段21の出力値を減算演算した減算値を求め、こ
の減算値に基づくPWM演算したゲート信号によりイン
バータ2の電力用半導体デバイスをオン・オフ制御する
PWM制御手段22とを備える。
1 is a circuit configuration diagram of a control circuit of a power converter showing an embodiment of the present invention. Components having the same functions as those of the conventional example shown in FIG. And its description is omitted. That is, in FIG. 1, the control circuit 20 of this power converter includes, in addition to the voltage detecting means 11, the instantaneous voltage command value generating means 12, the instantaneous voltage adjusting means 13, the AC current (I L ) of the reactor 3 as CT6. Current differential means 21 for detecting and calculating the differential amount of the detected value and outputting it, and the current value from the added value obtained by adding and calculating the instantaneous voltage command value (V IN ) and the output value of the instantaneous voltage adjusting means 13. The output value of the differentiating means 21 is subtracted and the subtraction value is obtained, and the PWM control means 22 is used to turn on / off the power semiconductor device of the inverter 2 by the PWM-operated gate signal based on the subtraction value.

【0011】図2は、図1に示したこの発明の電力変換
装置を伝達関数で表したブロック線図であり、図6で示
した従来の電力変換装置の伝達関数ブロックと同一機能
のものには同一符号を付している。図2において、伝達
関数ブロック54は電流微分手段21を伝達関数表示し
たものでK2 は微分ゲインである。
FIG. 2 is a block diagram showing the transfer function of the power converter of the present invention shown in FIG. 1, and has the same function as the transfer function block of the conventional power converter shown in FIG. Are given the same reference numerals. In FIG. 2, a transfer function block 54 is a transfer function representation of the current differentiating means 21, and K 2 is a differential gain.

【0012】図3は、図2に示した伝達関数ブロックの
ブロック線図を等価変換したブロック線図であり、伝達
関数ブロック55は、図示の如く、電流微分手段21の
伝達関数を伝達関数ブロック52の入力に効かせるよう
に変形するための伝達関数表示である。図3において、
伝達関数ブロック51と伝達関数ブロック55とを1つ
にまとめた伝達関数G(s)は、式(1)で表される。
FIG. 3 is a block diagram obtained by equivalently converting the block diagram of the transfer function block shown in FIG. 2, and the transfer function block 55 transfers the transfer function of the current differentiating means 21 to the transfer function block as shown. 52 is a transfer function display for transforming the input of 52. In FIG.
The transfer function G (s), which is a combination of the transfer function block 51 and the transfer function block 55, is represented by Expression (1).

【0013】[0013]

【数1】 G(s)=(1/sL)/(1+1/sL×sK1 2 ε-Ts ) =1/〔s(L+K1 2 ε-Ts )〕 ……(1) 式(1)において、低い周波数領域では無駄時間要素ε
-Ts は無視できるので、式(1)は式(2)に置き換え
られる。
## EQU1 ## G (s) = (1 / sL) / (1 + 1 / sL × sK 1 K 2 ε -Ts ) = 1 / [s (L + K 1 K 2 ε -Ts )] (1) Expression ( In 1), in the low frequency region, the dead time element ε
Since -Ts can be ignored, equation (1) is replaced by equation (2).

【0014】[0014]

【数2】 G(s)= 1/〔s(L+K1 2 )〕 ……(2) 図4は、前記式(3)に基づくこの発明の電力変換装置
を伝達関数で表したブロック線図である。図4で明らか
なように伝達関数ブロック56は、図6で示した従来の
電力変換装置の伝達関数ブロック52のLがL+K1
2 となり等価的にリアクトル3の値を大きくなったこと
を意味し、伝達関数ブロック56と伝達関数ブロック5
3とによる共振周波数を低くでき、この電力変換器の閉
ループ制御系が不安定になることが防止される。
## EQU2 ## G (s) = 1 / [s (L + K 1 K 2 )] (2) FIG. 4 is a block line showing a transfer function of the power converter of the present invention based on the equation (3). It is a figure. As is clear from FIG. 4, in the transfer function block 56, L of the transfer function block 52 of the conventional power conversion device shown in FIG. 6 is L + K 1 K.
2 means that the value of reactor 3 is increased equivalently, and transfer function block 56 and transfer function block 5
3, the resonance frequency can be lowered, and the closed loop control system of this power converter can be prevented from becoming unstable.

【0015】なお、図1において、電流微分手段21は
リアクトル3の交流電流(IL )の微分量を演算してい
ることから、このIL の大きさの影響を受けず、例えば
ピーク値の大きなIL に対しても前記VOUT に歪みを与
えず、閉ループ制御系の制御性能を向上させることがで
きる。また、電流微分手段として前記IL をサンプリン
グにより検出し、前回のサンプル値と今回のサンプル値
との差分を出力する差分回路により行ってもよい。
In FIG. 1, since the current differentiating means 21 calculates the differential amount of the alternating current (I L ) of the reactor 3, it is not affected by the magnitude of this I L and, for example, the peak value It is possible to improve the control performance of the closed loop control system without giving a distortion to the V OUT even for a large I L. Alternatively, the current differentiating means may detect the I L by sampling and use a difference circuit that outputs the difference between the previous sample value and the current sample value.

【0016】[0016]

【発明の効果】この発明によれば、上述の如く、電力変
換装置の制御回路に電流微分手段を設けることにより等
価的に大きな値のリアクトルにできるので、この閉ルー
プ制御系の安定動作を維持しつつ、この電力変換装置を
小型にし、安価にする。
According to the present invention, as described above, by providing the current differentiating means in the control circuit of the power converter, the reactor having an equivalently large value can be obtained, so that the stable operation of the closed loop control system is maintained. At the same time, the power converter is made compact and inexpensive.

【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電力変換装置の制御回
路の回路構成図
FIG. 1 is a circuit configuration diagram of a control circuit of a power converter showing an embodiment of the present invention.

【図2】図1の動作を説明するブロック線図FIG. 2 is a block diagram illustrating the operation of FIG.

【図3】図1の動作を説明するブロック線図FIG. 3 is a block diagram illustrating the operation of FIG.

【図4】図1の動作を説明するブロック線図FIG. 4 is a block diagram illustrating the operation of FIG.

【図5】従来例を示す電力変換装置の制御回路の回路構
成図
FIG. 5 is a circuit configuration diagram of a control circuit of a power conversion device showing a conventional example.

【図6】図5の動作を説明するブロック線図FIG. 6 is a block diagram illustrating the operation of FIG.

【符号の説明】[Explanation of symbols]

1 直流電源 2 インバータ 3 リアクトル 4 コンデンサ 5 負荷 6 CT 10 制御回路 11 電圧検出手段 12 瞬時電圧指令値発生手段 13 瞬時電圧調節手段 14 PWM制御手段 20 制御回路 21 電流微分手段 22 PWM制御手段 51〜56 伝達関数ブロック 1 DC Power Supply 2 Inverter 3 Reactor 4 Capacitor 5 Load 6 CT 10 Control Circuit 11 Voltage Detection Means 12 Instantaneous Voltage Command Value Generating Means 13 Instantaneous Voltage Adjusting Means 14 PWM Control Means 20 Control Circuit 21 Current Differentiating Means 22 PWM Control Means 51-56 Transfer function block

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】インバータの出力にリアクトルとコンデン
サからなるLC直列回路を接続し、該コンデンサの両端
に接続された負荷に交流電力を供給する電力変換装置の
制御回路において、 前記コンデンサの両端の電圧を検出する電圧検出手段
と、 前記リアクトルの電流を検出し、この検出値の微分量を
演算して出力する電流微分手段と、 任意の波形の瞬時電圧指令値を出力する瞬時電圧指令値
発生手段と、 瞬時電圧指令値と電圧検出手段の出力値との偏差を調節
演算する瞬時電圧調節手段と、 瞬時電圧指令値と瞬時電圧調節手段の出力値とを加算演
算した加算値から電流微分手段の出力値を減算演算した
減算値を求め、この減算値に基づくPWM演算したゲー
ト信号により前記インバータを構成する電力用半導体デ
バイスをオン・オフ制御するPWM制御手段とを備えた
ことを特徴とする電力変換装置の制御回路。
Claim: What is claimed is: 1. A control circuit of a power conversion device, wherein an LC series circuit including a reactor and a capacitor is connected to an output of an inverter, and AC power is supplied to a load connected to both ends of the capacitor. A voltage detecting means for detecting the current, a current differentiating means for detecting the current of the reactor and calculating and outputting a differential amount of the detected value, and an instantaneous voltage command value generating means for outputting an instantaneous voltage command value of an arbitrary waveform. And an instantaneous voltage adjusting means for adjusting and calculating the deviation between the instantaneous voltage command value and the output value of the voltage detecting means, and an added value obtained by adding and calculating the instantaneous voltage command value and the output value of the instantaneous voltage adjusting means. A subtraction value obtained by subtracting the output value is obtained, and a PWM-based gate signal based on the subtraction value is used to turn on / off the power semiconductor device forming the inverter. The control circuit of the power conversion apparatus characterized by comprising a PWM control means for.
JP8042289A 1996-02-29 1996-02-29 Control circuit of power converter Pending JPH09233844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8042289A JPH09233844A (en) 1996-02-29 1996-02-29 Control circuit of power converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8042289A JPH09233844A (en) 1996-02-29 1996-02-29 Control circuit of power converter

Publications (1)

Publication Number Publication Date
JPH09233844A true JPH09233844A (en) 1997-09-05

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ID=12631891

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8042289A Pending JPH09233844A (en) 1996-02-29 1996-02-29 Control circuit of power converter

Country Status (1)

Country Link
JP (1) JPH09233844A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013143876A (en) * 2012-01-12 2013-07-22 Daihen Corp Control circuit for power inverter circuit, and interconnection inverter system and single-phase pwm converter system using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013143876A (en) * 2012-01-12 2013-07-22 Daihen Corp Control circuit for power inverter circuit, and interconnection inverter system and single-phase pwm converter system using the same

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