JPH07115770A - Control system for power converter - Google Patents
Control system for power converterInfo
- Publication number
- JPH07115770A JPH07115770A JP25957493A JP25957493A JPH07115770A JP H07115770 A JPH07115770 A JP H07115770A JP 25957493 A JP25957493 A JP 25957493A JP 25957493 A JP25957493 A JP 25957493A JP H07115770 A JPH07115770 A JP H07115770A
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- JP
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- Prior art keywords
- voltage
- current
- converter
- power
- output
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、交流／直流、さらに直
流／可変電源と変換・制御を行う電力変換装置の制御方
式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system of an electric power converter for converting and controlling alternating current / direct current, and further direct current / variable power source.
【０００２】[0002]
【従来の技術】交流／直流電力変換装置（以下、コンバ
ータと呼ぶ）と直流／可変交流電力変換装置（以下、イ
ンバータと呼ぶ）を用いて負荷装置を制御する電力変換
装置の制御装置としては、例えば交流電動機の可変速装
置や無停電電源装置をはじめとして多くの応用例があ
り、既に広く実用化されている。また、一旦中間リンク
部で直流電圧源に変換する方式は、中間リンク部のコン
デンサで負荷の無効電力を処理可能なことや、直流電源
部を共通母線として複数台のインバータを接続できる等
の利点があり、有効な電力変換装置の制御方式の一つで
ある。2. Description of the Related Art As a control device for a power converter that controls a load device using an AC / DC power converter (hereinafter referred to as a converter) and a DC / variable AC power converter (hereinafter referred to as an inverter), For example, there are many application examples including a variable speed device of an AC motor and an uninterruptible power supply device, which have already been widely put into practical use. In addition, the method of once converting to a DC voltage source in the intermediate link section has the advantage that the reactive power of the load can be processed by the capacitor in the intermediate link section and that multiple inverters can be connected with the DC power supply section as a common bus. Is one of the effective control methods for the power converter.
【０００３】一般的には、上記の如き制御方式では、コ
ンバータ，インバータは独立して制御されている場合が
多かったが、インバータの負荷急変に対してコンバータ
の直流電圧応答が追従できず直流電圧が過渡的に変動
し、インバータの制御の外乱になったり、極端な場合に
は回路部品の劣化を招くという問題があった。Generally, in the above control method, the converter and the inverter are often controlled independently, but the DC voltage response of the converter cannot follow a sudden load change of the inverter, and the DC voltage cannot be controlled. Transiently fluctuates, causing disturbance in the control of the inverter, and in extreme cases, causing deterioration of circuit components.
【０００４】このような問題を解決する最近の技術例と
して、例えば特開平３−２４５７９３号公報に開示され
ている。この技術は図６に示すような回路構成をなして
いる。同図において、１は交流電源、５は負荷装置、１
１はコンバータ、１３はリアクトル、１４は電流検出
器、１６は増幅器、４１はインバータ、５０はリミッ
タ、５１は電源位相検出器、５２は電流指令発生回路、
５３は除算器、５４は乗算器４、５５はインバータ制御
器、５６はインバータ入力平均電流計算演算部、５７は
電流検出器である。A recent technical example for solving such a problem is disclosed in, for example, Japanese Patent Laid-Open No. 3-245793. This technique has a circuit configuration as shown in FIG. In the figure, 1 is an AC power supply, 5 is a load device, 1
1 is a converter, 13 is a reactor, 14 is a current detector, 16 is an amplifier, 41 is an inverter, 50 is a limiter, 51 is a power supply phase detector, 52 is a current command generation circuit,
53 is a divider, 54 is a multiplier 4, 55 is an inverter controller, 56 is an inverter input average current calculation operation unit, and 57 is a current detector.
【０００５】上記の如き構成の従来の制御方式は、次の
如く行われる。すなわち、コンバータ１１の直流出力電
圧ＶD の制御をするにあたり次の二つの検出制御信号を
用いてコンバータ１１の入力電流を制御している。一つ
は直流出力電圧指令値ＶD ＊と直流出力電圧検出値ＶD
とを比較し、その偏差を増幅器１６で増幅してコンバー
タ１１の第１の入力電流指令値ΔＩP ＊とし、もう一つ
はインバータ出力電流検出値ｉU ，ｉV にＰＷＭ変調信
号に基づくリップル除去処理をして得られた瞬時インバ
ータ入力電流信号ＩDCとインバータ入力直流電圧検出値
ＶD を乗算して瞬時インバータ入力電力ＰL を得、さら
に、コンバータ入力電圧で除算してコンバータの第２の
入力電流指令値ＩPL＊とし、コンバータの第１の入力電
流指令値ΔＩP ＊とコンバータの第２の入力電流指令値
ＩPL＊を加算してコンバータ入力電流指令値Ｉ＊として
コンバータの入力電流を制御する方式が採用されてい
る。The conventional control system having the above-mentioned configuration is performed as follows. That is, in controlling the DC output voltage V D of the converter 11, the input current of the converter 11 is controlled using the following two detection control signals. One is DC output voltage command value V D * and DC output voltage detection value V D
And the deviation is amplified by the amplifier 16 to be the first input current command value ΔI P * of the converter 11, and the other is the ripples based on the PWM modulation signal for the inverter output current detection values i U and i V. obtain the instantaneous inverter input power P L by multiplying the instantaneous inverter input current signal I DC inverter input DC voltage detected value V D obtained by the removal process, further, the converter is divided by the input voltage a second converter Input current command value I PL * of the converter, the first input current command value ΔI P * of the converter and the second input current command value I PL * of the converter are added, and the converter input current command value I * is input to the converter. The method of controlling the current is adopted.
【０００６】この制御方式によれば、定常時には前記第
１の制御ループでのフィードバック制御により精度良
く、また過渡時には第２の制御ループでのフィードフォ
ワード制御により高速に制御され、コンバータ直流出力
電圧の変動を低減することができる。According to this control method, the feedback control in the first control loop is performed with high accuracy in the steady state, and the feedforward control in the second control loop is performed in the high speed during the transient state to control the converter DC output voltage. Fluctuations can be reduced.
【０００７】[0007]
【発明が解決しようとする課題】しかし、上述の従来の
制御方式においては、インバータの入力電流相当の信号
をインバータの出力電流とインバータのＰＷＭパターン
信号とから高速で複雑な演算により求めているので、高
速な演算部が必要なこと、およびインバータが複数の場
合には各インバータからインバータ入力電流相当の信号
をコンバータへ渡し、さらに各インバータの容量に見合
った重み付け処理をしなければ実現できないという欠点
があった。However, in the above-mentioned conventional control method, since the signal corresponding to the input current of the inverter is obtained from the output current of the inverter and the PWM pattern signal of the inverter by high speed and complicated calculation. , A high-speed operation unit is required, and when there are multiple inverters, it cannot be realized without passing a signal corresponding to the inverter input current from each inverter to the converter and performing weighting processing corresponding to the capacity of each inverter. was there.
【０００８】本発明は上記事情に鑑みてなされたもの
で、その目的は、負荷装置、特に複数台の負荷装置へ複
数台のインバータで電力を供給する際の、負荷電力の急
変時にもコンバータの直流出力電圧の変動を最小限に抑
制する簡単でかつ安価な電力変換装置の制御方式を提供
することにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a converter for a load device, in particular, when a plurality of inverters supply electric power to a plurality of load devices even when the load power suddenly changes. An object of the present invention is to provide a simple and inexpensive control method for a power converter that suppresses fluctuations in DC output voltage to a minimum.
【０００９】[0009]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の請求項１は交流電源を、スイッチング素
子により構成された第１の電力変換装置により直流電源
に変換し、この直流電源をスイッチング素子により構成
された第２の電力変換装置により可変電源に再変換して
負荷に供給する電力変換装置の制御方式において、前記
第１の電力変換装置は、前記直流電源の電圧制御手段
と、前記第１の電力変換装置が出力する電流相当に対す
る電流制御手段を備え、前記電圧制御手段の出力に、前
記直流電源の出力電圧の時間変化率信号と前記第１の電
力変換装置の出力電流相当値と直流母線に接続されるコ
ンデンサの静電容量相当値から演算した補償信号を加算
して前記電流制御手段の電流基準信号とすることによ
り、前記直流電源電圧の過渡変動を低減することを特徴
とする。また請求項２は第１の電力変換装置の出力電流
相当値から、直流電源出力電圧の時間変化率とコンデン
サの静電容量相当値との乗算結果を減算して、前記第１
の電力変換装置の電流制御指令信号に対する補償信号と
することを特徴とする。さらに請求項３は第１の電力変
換装置の直流出力を共通として、コンデンサおよび第２
の電力変換装置の少なくとも一方以上が複数個並列接続
されていることを特徴とする。In order to achieve the above object, the first aspect of the present invention is to convert an alternating current power supply into a direct current power supply by a first power conversion device composed of a switching element, In a control method of a power conversion device that reconverts a power supply into a variable power supply by a second power conversion device configured by a switching element and supplies the variable power supply, the first power conversion device is a voltage control means of the DC power supply. And a current control means for the current equivalent to the current output by the first power converter, wherein the voltage control means outputs the time change rate signal of the output voltage of the DC power supply and the output of the first power converter. The DC power supply voltage is obtained by adding a compensation signal calculated from the current equivalent value and the capacitance equivalent value of the capacitor connected to the DC bus to the current reference signal of the current control means. And wherein the reducing transients. According to a second aspect of the present invention, the multiplication result of the time change rate of the DC power supply output voltage and the capacitance equivalent value of the capacitor is subtracted from the output current equivalent value of the first power converter to obtain the first value.
The power conversion device is a compensation signal for the current control command signal. Further, a third aspect of the present invention is that the DC output of the first power converter is common, and the capacitor and the second
A plurality of at least one of the power conversion devices is connected in parallel.
【００１０】[0010]
【作用】本発明によると、交流／直流電力変換器に対
し、直流フィルタコンデンサを有する直流／可変電源変
換器が複数台分散接続されたシステムにおいても、特別
な付加装置を必要としないで負荷の瞬時電流相当値を演
算にて検出することができる。さらに直流電圧制御回路
の出力と加算した信号をコンバータの電流指令信号とし
て、この電流指令信号に一致するようにコンバータ電流
を制御することによって、特別な付加装置を必要とせず
に直流電圧の過渡変動を低減することができる。これに
より、インバータの制御への外乱を低減でき、直流リン
クを持つコンバータ，インバータシステムを安定かつ高
速に制御することができる。According to the present invention, even in a system in which a plurality of direct current / variable power source converters having direct current filter capacitors are dispersedly connected to an alternating current / direct current power converter, no load is required for a load without requiring a special additional device. The instantaneous current equivalent value can be detected by calculation. Furthermore, the signal added to the output of the DC voltage control circuit is used as the converter current command signal, and by controlling the converter current so that it matches this current command signal, transient fluctuations in the DC voltage can be achieved without the need for special additional equipment. Can be reduced. As a result, disturbance to the control of the inverter can be reduced, and the converter and inverter system having the DC link can be controlled stably and at high speed.
【００１１】[0011]
【実施例】以下、本発明の実施例を図について説明す
る。図１は本発明の一実施例の構成図である。同図にお
いて、交流電源１は第１の電力変換装置（以下コンバー
タ）２により一旦直流電源に変換され、さらに、第２の
電力変換装置（以下インバータ）３にて可変電圧・可変
周波数の交流電源に変換され負荷装置５に可変電力を供
給する。コンバータ２の内部構成は、第１の電力変換器
１１、交流リアクトル１３、交流入力の電流検出器１
４、出力直流電圧を制御する直流電圧制御回路１６およ
び第１の電力変換器１１の制御回路１５から成る。また
インバータ３の内部構成は、第２の電力変換器４１、直
流コンデンサ４２および第２の電力変換器４１の制御回
路４３から成っている。インバータ３と同様のｎ台目の
インバータ装置４が並列に接続され、それぞれのインバ
ータ装置３，４に対してそれぞれ負荷装置５，６が接続
されている。なお、インバータ装置４の内部構成は第ｎ
の電力変換器４７、直流コンデンサ４８および第ｎの電
力変換器４７の制御回路４９とから成っている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, an AC power supply 1 is once converted into a DC power supply by a first power converter (hereinafter, converter) 2, and further, a second power converter (hereinafter, inverter) 3 is an AC power supply of variable voltage and variable frequency. And is supplied to the load device 5 with variable power. The internal configuration of the converter 2 includes a first power converter 11, an AC reactor 13, and an AC input current detector 1.
4. A DC voltage control circuit 16 for controlling the output DC voltage and a control circuit 15 for the first power converter 11. The internal configuration of the inverter 3 includes a second power converter 41, a DC capacitor 42, and a control circuit 43 for the second power converter 41. An nth inverter device 4 similar to the inverter 3 is connected in parallel, and load devices 5 and 6 are connected to the respective inverter devices 3 and 4. The internal configuration of the inverter device 4 is the n-th.
Power converter 47, a DC capacitor 48, and a control circuit 49 of the nth power converter 47.
【００１２】コンバータ装置２は、図４に示すように、
直流電圧の定常値を制御する直流電圧制御回路１６と、
負荷に流すべき有効分電流を演算する直流負荷電流演算
回路２４と、直流電圧制御回路１６の出力信号ΔＩp ＊
と直流負荷電流演算回路２４の出力信号Ｉp ＊との和Ｉ
sp＊をコンバータの電流指令信号として電流制御を行う
電流制御回路２６とから構成されている。The converter device 2, as shown in FIG.
A DC voltage control circuit 16 for controlling a steady value of the DC voltage,
The output signal ΔI p * of the DC load current calculation circuit 24 and the DC voltage control circuit 16 that calculates the effective component current to be passed through the load.
And the output signal I p * of the DC load current calculation circuit 24, I
It is composed of a current control circuit 26 that performs current control using sp * as a current command signal of the converter.
【００１３】図２は図１の第１の電力変換装置（コンバ
ータ）２の詳細な構成図である。同図において、制御回
路１５の内部構成は、３相交流電源の相電圧を検出し３
相／２相変換器２１にて２相電圧信号ｅs に変換し、ま
た交流電源電流を検出して３相／２相変換器２２にて２
相電流信号ｉs に変換して座標変換器２３に入力し、２
相電流信号ｉs からコンバータの入力電流信号ＩP を得
る。この入力電流信号ＩP はコンバータ出力電流に対応
する信号であるので、コンバータ出力電流相当の信号と
みなしてよい。FIG. 2 is a detailed configuration diagram of the first power converter (converter) 2 of FIG. In the figure, the internal configuration of the control circuit 15 detects the phase voltage of the three-phase AC power source and
Phase / in 2-phase converter 21 converts the two-phase voltage signals e s, also detects the AC power source current at 3-phase / 2-phase converter 22 2
The phase current signal i s is converted and input to the coordinate converter 23.
Obtaining an input current signal I P converter from the phase current signals i s. Since this input current signal IP is a signal corresponding to the converter output current, it may be regarded as a signal corresponding to the converter output current.
【００１４】一方、直流母線の電圧は、電圧検出器１２
により直流電圧信号ＶD として検出され、一つは直流電
圧制御回路１６へのフィードバック信号として、もう一
つは直流負荷電流演算回路２４へ入力される。On the other hand, the voltage of the DC bus is detected by the voltage detector 12
Is detected as a DC voltage signal V D by the DC voltage control circuit 16, one of which is a feedback signal to the DC voltage control circuit 16 and the other of which is input to the DC load current calculation circuit 24.
【００１５】直流電圧制御回路１６では、直流電圧指令
信号ＶD ＊に直流電圧定常値が一致するように積分系増
幅器による制御を行い、制御出力としてΔＩP ＊を出力
する。また、直流負荷電流演算回路２４は、図３に示す
ような機能ブロックで構成されているので、直流電圧指
令信号ＶD ＊を微分したものを入力電流Ｉp より減算
し、直流母線に接続される総静電容量ΣＣを積算して、
後記（１）式に基づき直流負荷電流瞬時値を演算する。
この出力を瞬時電流指令値ＩP ＊とし、前記直流電圧制
御出力ΔＩP ＊と加算し、リミッタ２５を介してコンバ
ータの電流指令値ＩSP＊とする。この電流指令値ＩSP＊
に一致するよう電流制御回路２６によってコンバータの
入力電流ＩP をフィードバック制御するために、この出
力である電圧指令信号ＶS ＊を座標変換器２７により交
流電源電圧に同期した交流電圧指令ＶSO＊とし、さらに
ＰＷＭ制御回路２８を介して第１の電力変換器１１を駆
動する。The DC voltage control circuit 16 controls by the integrating system amplifier so that the DC voltage steady state value matches the DC voltage command signal V D *, and outputs ΔI P * as the control output. Further, since the DC load current calculation circuit 24 is composed of the functional blocks as shown in FIG. 3, the DC voltage command signal V D * is differentiated and subtracted from the input current I p to be connected to the DC bus. Total capacitance ΣC
The DC load current instantaneous value is calculated based on the equation (1) described later.
This output is used as the instantaneous current command value I P *, and is added to the DC voltage control output ΔI P * to obtain the converter current command value I SP * via the limiter 25. This current command value I SP *
In order to perform feedback control of the input current I P of the converter by the current control circuit 26 so that the voltage command signal V S *, which is this output, is coordinated by the coordinate converter 27 to an AC voltage command V SO *. Then, the first power converter 11 is driven via the PWM control circuit 28.
【００１６】ところで、コンバータ装置２は、図４に示
すように、直流電圧の定常値を制御する直流電圧制御回
路１６と、負荷に流すべき有効分電流を演算する直流負
荷電流演算回路２４と、直流電圧制御回路１６の出力信
号ΔＩp ＊と前記直流負荷電流演算回路２４の出力信号
Ｉp ＊との和Ｉsp＊をコンバータの電流指令信号として
電流制御を行う電流制御回路２６とから構成されてい
る。また、直流負荷電流演算回路２４は直流母線での負
荷電流の瞬時値ＩPLと直流母線でのコンバータ出力電流
瞬時値ＩP と直流母線に接続される総静電容量の充電電
流瞬時値ＩC は図５に示すような等価回路で表現でき
る。したがって、直流負荷電流演算回路２４では次式に
よりＩPLを演算できる。By the way, as shown in FIG. 4, the converter device 2 includes a DC voltage control circuit 16 for controlling a steady value of a DC voltage, a DC load current calculation circuit 24 for calculating an effective component current to be passed through a load, The current control circuit 26 is configured to perform current control using the sum I sp * of the output signal ΔI p * of the DC voltage control circuit 16 and the output signal I p * of the DC load current calculation circuit 24 as a current command signal of the converter. ing. Further, the DC load current calculation circuit 24 uses the instantaneous value I PL of the load current on the DC bus, the instantaneous value I P of the converter output current on the DC bus, and the instantaneous value I C of the charging current of the total capacitance connected to the DC bus. Can be expressed by an equivalent circuit as shown in FIG. Therefore, the DC load current calculation circuit 24 can calculate I PL by the following equation.
【００１７】ＩPL＝ＩP −ＩC ＝ＩP −ΣＣ×（ｄＶD ／ｄｔ） …（１） ここで、ΣＣ：直流母線に接続される総静電容量 ＶD ：直流電圧瞬時値 上記（１）式により、総負荷電流の瞬時値ＩPLが求めら
れ、これをコンバータの瞬時値電流指令値ＩP ＊とし、
この指令値に一致するようにコンバータの出力電流ＩP
を流せば、直流母線のコンデンサへの充放電電流は原理
的にはゼロとなり、直流母線電圧は変動しない。実際に
は、検出誤差や演算誤差、およびコンバータの電流制御
回路の応答遅れにより完全に負荷電流を相殺することは
できないが、これは積分系の増幅器で構成した直流電圧
制御回路１６の出力信号ΔＩP ＊を瞬時電流指令値ＩP
＊に加算してコンバータの電流指令値ＩSP＊とすること
によって定常値を偏差なく制御することができる。I PL = I P −I C = I P −ΣC × (dV D / dt) (1) where ΣC: total capacitance connected to the DC bus V D : instantaneous DC voltage value The instantaneous value I PL of the total load current is obtained from the equation (1), and this is taken as the instantaneous value current command value I P * of the converter,
Output current I P of the converter to match this command value
In principle, the charging / discharging current to the capacitor of the DC bus is zero, and the DC bus voltage does not change. Actually, the load current cannot be completely canceled due to the detection error, the calculation error, and the response delay of the current control circuit of the converter, but this is due to the output signal ΔI of the DC voltage control circuit 16 composed of an integrating amplifier. P * is the instantaneous current command value I P
By adding to * the current command value I SP * of the converter, the steady value can be controlled without deviation.
【００１８】上述したように、本実施例によると負荷の
瞬時電流を、直流電圧の時間変化率とコンバータの出力
電流相当信号と負荷の総静電容量とから演算して求め、
さらに直流電圧制御回路の出力と加算した信号をコンバ
ータの電流指令信号とする。この電流指令信号に一致す
るようにコンバータ電流を制御することによって、イン
バータとのインターフェイスや特別な付加装置を必要と
せず、直流電圧の過渡変動を低減することができる。こ
れにより、インバータの制御への外乱を低減でき、直流
リンクを持つコンバータ，インバータシステムを安定か
つ高速に制御することが可能となる。As described above, according to this embodiment, the instantaneous current of the load is calculated by calculating from the time change rate of the DC voltage, the output current equivalent signal of the converter, and the total capacitance of the load,
Further, the signal added to the output of the DC voltage control circuit is used as the current command signal of the converter. By controlling the converter current so as to match the current command signal, it is possible to reduce the transient fluctuation of the DC voltage without requiring an interface with the inverter or a special additional device. As a result, disturbance to the control of the inverter can be reduced, and the converter and inverter system having the DC link can be controlled stably and at high speed.
【００１９】さらに、本発明は、交流／直流電力変換す
るコンバータの出力を共通母線として、直流フィルタコ
ンデンサを有する複数台のインバータ群，負荷群を駆動
するシステムにおいて、特に大きな利点を得ることがで
きる。すなわち、各インバータ群からの負荷電流相当の
信号をインターフェイスすることなく、総負荷の瞬時電
流を簡単な演算回路だけで求めることができ、この負荷
電流信号に基づき共通のコンバータが流すべき電流指令
を高速に補償制御できる。Further, the present invention can obtain a particularly great advantage in a system for driving a plurality of inverter groups and load groups having a DC filter capacitor with the output of a converter for AC / DC power conversion as a common bus. . That is, the instantaneous current of the total load can be obtained by only a simple arithmetic circuit without interfacing the signal corresponding to the load current from each inverter group, and the current command that the common converter should flow based on this load current signal. High-speed compensation control is possible.
【００２０】[0020]
【発明の効果】以上説明したように、本発明によれば、
交流／直流電力変換器に対し、直流フィルタコンデンサ
を有する直流／可変電源変換器が複数台分散接続された
システムにおいても、特別な付加装置を必要としないで
負荷の瞬時電流相当値を演算にて検出することができ
る。これにより、直流電圧の過渡変動を低減することが
でき、さらにインバータの制御への外乱を低減でき、直
流リンクを持つコンバータ，インバータシステムを安定
かつ高速に制御することが可能となる。As described above, according to the present invention,
Even in a system in which multiple DC / variable power converters with DC filter capacitors are dispersedly connected to AC / DC power converters, the instantaneous current equivalent value of the load can be calculated without the need for special additional equipment. Can be detected. As a result, it is possible to reduce the transient fluctuation of the DC voltage, further reduce the disturbance to the control of the inverter, and stably and rapidly control the converter and the inverter system having the DC link.
【図１】本発明の一実施例の構成図。FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】図１のコンバータの構成図。FIG. 2 is a block diagram of the converter shown in FIG.
【図３】図２の直流負荷電流演算回路の機能ブロック
図。FIG. 3 is a functional block diagram of the DC load current calculation circuit of FIG.
【図４】図１の制御部分の機能ブロック図。FIG. 4 is a functional block diagram of a control unit in FIG.
【図５】本発明の原理を説明するための図。FIG. 5 is a diagram for explaining the principle of the present invention.
【図６】従来の電力変換装置の構成図。FIG. 6 is a configuration diagram of a conventional power conversion device.
１…交流電源、２…第１の電力変換装置、３…第２の電
力変換装置、４…第ｎの電力変換装置、５…負荷装置、
６…負荷装置、１１…第１の電力変換器、１３…交流リ
アクトル、１４…電流検出器、１５…コンバータ制御回
路、１６…直流電圧制御回路、２１…３相／２相変換回
路、２２…３相／２相変換回路、２３…座標変換回路、
２４…直流負荷電流演算回路、２５…リミッタ、２６…
電流制御回路、２７…座標変換回路、２８…ＰＷＭ制御
回路。DESCRIPTION OF SYMBOLS 1 ... AC power supply, 2 ... 1st power converter device, 3 ... 2nd power converter device, 4 ... nth power converter device, 5 ... load device,
6 ... Load device, 11 ... 1st power converter, 13 ... AC reactor, 14 ... Current detector, 15 ... Converter control circuit, 16 ... DC voltage control circuit, 21 ... 3 phase / 2 phase conversion circuit, 22 ... 3 phase / 2 phase conversion circuit, 23 ... Coordinate conversion circuit,
24 ... DC load current arithmetic circuit, 25 ... Limiter, 26 ...
Current control circuit, 27 ... Coordinate conversion circuit, 28 ... PWM control circuit.
Claims (3)
成された第１の電力変換装置により直流電源に変換し、
この直流電源をスイッチング素子により構成された第２
の電力変換装置により可変電源に再変換して負荷に供給
する電力変換装置の制御方式において、前記第１の電力
変換装置は、前記直流電源の電圧制御手段と、前記第１
の電力変換装置が出力する電流相当値に対する電流制御
手段を備え、前記電圧制御手段の出力に、前記直流電源
の出力電圧の時間変化率信号と前記第１の電力変換装置
の出力電流相当値と直流母線に接続されるコンデンサの
静電容量相当値から演算した補償信号を加算して前記電
流制御手段の電流基準信号とすることにより、前記直流
電源電圧の過渡変動を低減することを特徴とする電力変
換装置の制御方式。1. An AC power supply is converted into a DC power supply by a first power conversion device including a switching element,
This DC power source has a second element composed of a switching element.
In the control method of the power conversion device for reconverting to a variable power supply by the power conversion device and supplying the power to the load, the first power conversion device includes voltage control means for the DC power supply and the first power conversion device.
Current control means for the current equivalent value output by the power converter, and the time change rate signal of the output voltage of the DC power supply and the output current equivalent value of the first power converter at the output of the voltage control means. A transient fluctuation of the DC power supply voltage is reduced by adding a compensation signal calculated from an electrostatic capacitance equivalent value of a capacitor connected to a DC bus to obtain a current reference signal of the current control means. Power converter control method.
ら、直流電源出力電圧の時間変化率とコンデンサの静電
容量相当値との乗算結果を減算して、前記第１の電力変
換装置の電流制御指令信号に対する補償信号とすること
を特徴とする請求項１記載の電力変換装置の制御方式。2. The first power conversion device, wherein the multiplication result of the time change rate of the DC power supply output voltage and the capacitance equivalent value of the capacitor is subtracted from the output current equivalent value of the first power conversion device. The control method of the power converter according to claim 1, wherein the current control command signal is used as a compensation signal.
して、コンデンサおよび第２の電力変換装置の少なくと
も一方以上が複数個並列接続されていることを特徴とす
る請求項１または請求項２記載の電力変換装置の制御方
式。3. A plurality of at least one of a capacitor and a second power conversion device are connected in parallel with each other while using a common DC output of the first power conversion device. The control method of the described power converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25957493A JP3170119B2 (en) | 1993-10-18 | 1993-10-18 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25957493A JP3170119B2 (en) | 1993-10-18 | 1993-10-18 | Power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07115770A true JPH07115770A (en) | 1995-05-02 |
| JP3170119B2 JP3170119B2 (en) | 2001-05-28 |
Family
ID=17336018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25957493A Expired - Lifetime JP3170119B2 (en) | 1993-10-18 | 1993-10-18 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3170119B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6873204B2 (en) | 2000-10-12 | 2005-03-29 | Nec Corporation | Compact DC stabilized power supply capable of suppressing fluctuation of output voltage in spite of abrupt fluctuation of load current |
| JP2016158339A (en) * | 2015-02-24 | 2016-09-01 | 株式会社明電舎 | Property stabilization device for dc power supply system |
| CN114270688A (en) * | 2019-08-30 | 2022-04-01 | 三菱电机株式会社 | Power conversion device and air conditioner |
-
1993
- 1993-10-18 JP JP25957493A patent/JP3170119B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6873204B2 (en) | 2000-10-12 | 2005-03-29 | Nec Corporation | Compact DC stabilized power supply capable of suppressing fluctuation of output voltage in spite of abrupt fluctuation of load current |
| JP2016158339A (en) * | 2015-02-24 | 2016-09-01 | 株式会社明電舎 | Property stabilization device for dc power supply system |
| CN114270688A (en) * | 2019-08-30 | 2022-04-01 | 三菱电机株式会社 | Power conversion device and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3170119B2 (en) | 2001-05-28 |
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