JP2001025178A - Uninterruptible power unit - Google Patents

Uninterruptible power unit

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Publication number
JP2001025178A
JP2001025178A JP11194164A JP19416499A JP2001025178A JP 2001025178 A JP2001025178 A JP 2001025178A JP 11194164 A JP11194164 A JP 11194164A JP 19416499 A JP19416499 A JP 19416499A JP 2001025178 A JP2001025178 A JP 2001025178A
Authority
JP
Japan
Prior art keywords
converter
voltage
power
value
power supply
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.)
Granted
Application number
JP11194164A
Other languages
Japanese (ja)
Other versions
JP3632120B2 (en
Inventor
Mikiya Nohara
幹也 野原
Shigeta Ueda
茂太 上田
Hideyasu Umetsu
秀恭 梅津
Tamahiko Kanouda
玲彦 叶田
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP19416499A priority Critical patent/JP3632120B2/en
Publication of JP2001025178A publication Critical patent/JP2001025178A/en
Application granted granted Critical
Publication of JP3632120B2 publication Critical patent/JP3632120B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an uninterruptible power unit which transfers power between the first AC-DC converter 1 and the second DC-AC converter, and also can charge the storage battery stably, without the need for increasing the quantity of resistance to ripples of a DC capacitor or providing a reactor for prevention of discharge of the storage battery. SOLUTION: This is an uninterruptible power unit where a storage battery 3 and a DC capacitor 6 are connected in parallel to the DC side of the first AC-DC converter 1 and the second AC-DC converter 2, and normally a load 10 is supplied with AC power, and also a storage battery 3 is charged, and at power stoppage of the AC power source 9, the first AC-DC converter 1 converts the DC power of the storage battery 3 into AC power and supplies it to the load 10, and this is equipped with a means which detects and estimates instantaneous power of the first and second AC-DC converters, and controls the second AC-DC converter 2, so that the sum of an input voltage Vin from the AC power source 9 and the voltage on AC side of the second AC-DC converter 2 reaches a prescribed output voltage Vout, and controls the first AC-DC converter 1 to supply the instantaneous power outputted from the second AC-DC converter 2 and the instantaneous charge power to the storage battery 3.

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】本発明は、無停電電源装置に
係り、特に、負荷に安定した電力を供給するとともに、
蓄電池を最適に充電する回路構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply, and more particularly to a method for supplying stable power to a load.
The present invention relates to a circuit configuration for optimally charging a storage battery.

【０００２】[0002]

【従来の技術】第１交直変換器を出力端に並列接続し、
第２交直変換器を入力端と出力端との間に直列接続した
無停電電源装置が、IEEE TRANSACTIONS ON POWER ELECT
RONICS,VOL.13,No.3,MAY 1998,"A Novel On-Line UPS w
ith Universal Filtering Capabilities"に記載されて
いる。2. Description of the Related Art A first AC / DC converter is connected in parallel to an output terminal.
An uninterruptible power supply in which a second AC / DC converter is connected in series between an input terminal and an output terminal is an IEEE TRANSACTIONS ON POWER ELECT.
RONICS, VOL.13, No.3, MAY 1998, "A Novel On-Line UPS w
ith Universal Filtering Capabilities ".

【０００３】図１０は、従来の無停電電源装置の一例の
系統構成を示すブロック図である。この無停電電源装置
は、第１交直変換器１と第２交直変換器２とを備えてい
る。第１交直変換器１の交流側は、フィルタ用リアクト
ル１４を介して、出力端に並列接続してあり、フィルタ
用コンデンサ７も、出力端に並列接続してある。この出
力端には、負荷１０が接続される。FIG. 10 is a block diagram showing a system configuration of an example of a conventional uninterruptible power supply. This uninterruptible power supply includes a first AC / DC converter 1 and a second AC / DC converter 2. The AC side of the first AC / DC converter 1 is connected in parallel to the output terminal via a filter reactor 14, and the filter capacitor 7 is also connected in parallel to the output terminal. The load 10 is connected to this output terminal.

【０００４】外部交流電源９が接続されている入力端か
らは、スイッチ１３を介して、交流電力が導入される。
第２交直変換器２の交流側は、巻数比１：ｎ２の変圧器
５を介して、入力端と出力端との間に直列接続してあ
る。[0004] AC power is introduced from an input terminal to which the external AC power supply 9 is connected via a switch 13.
The AC side of the second AC / DC converter 2 is connected in series between an input terminal and an output terminal via a transformer 5 having a turns ratio of 1: n2.

【０００５】第１交直変換器１の直流側には、直流コン
デンサ６を並列接続し、蓄電池放電防止用リアクトル１
５を介して、蓄電池３を接続してある。[0005] A DC capacitor 6 is connected in parallel to the DC side of the first AC / DC converter 1, and a storage battery discharge preventing reactor 1 is connected.
5, a storage battery 3 is connected.

【０００６】電流検出器１１９は、入力電流Ｉinを検出
する。電流検出器１１３は、蓄電池電流Ｉbattを検出す
る。電流検出器１１０は、出力電流Ｉoutを検出する。
電圧検出器１１４は、出力電圧Ｖoutを検出する。制御
回路１２は、これらの電流検出値と電圧検出値とに基づ
き制御演算を実行し、第１交直変換器１，２を制御す
る。[0006] The current detector 119 detects the input current Iin. Current detector 113 detects storage battery current Ibatt. Current detector 110 detects output current Iout.
The voltage detector 114 detects the output voltage Vout. The control circuit 12 executes a control operation based on the detected current value and the detected voltage value to control the first AC / DC converters 1 and 2.

【０００７】外部交流電源９が停電した場合は、スイッ
チ１３を開き、第１交直変換器１で蓄電池３の電力を交
流に変換し、負荷１０に交流電力を供給する。When the external AC power source 9 is out of power, the switch 13 is opened, the power of the storage battery 3 is converted into AC by the first AC / DC converter 1, and AC power is supplied to the load 10.

【０００８】外部交流電源９が正常な通常状態では、制
御回路１２は、出力電圧Ｖoutおよび出力電流Ｉoutから
負荷１０の平均電力を演算する。第２交直変換器２は、
演算された負荷１０への平均電力と蓄電池３への充電電
力とを供給し、入力電流Ｉinが正弦波となるように、第
２交直変換器２の電圧を制御する。制御回路１２は、ま
た、出力電圧Ｖoutと入力電流Ｉin，出力電流Ｉoutとか
ら、完全次元オブザーバにより、第１交直変換器１の入
力電流を推定し、有限制定応答制御により、出力電圧Ｖ
outを一定に保つように、第１交直変換器１の電圧を制
御する。In a normal state where the external AC power supply 9 is normal, the control circuit 12 calculates the average power of the load 10 from the output voltage Vout and the output current Iout. The second AC-DC converter 2
The calculated average power to the load 10 and the charging power to the storage battery 3 are supplied, and the voltage of the second AC / DC converter 2 is controlled so that the input current Iin becomes a sine wave. The control circuit 12 also estimates the input current of the first AC / DC converter 1 by a full-dimensional observer from the output voltage Vout, the input current Iin, and the output current Iout, and performs the output voltage V
The voltage of the first AC / DC converter 1 is controlled so that out is kept constant.

【０００９】このように、上記文献の技術を用いれば、
入力電源９や負荷１０が急変しても入力電流Ｉinを正弦
波に保ち、アクティブフィルタの機能により、負荷１０
と蓄電池３とに安定した電力を供給できるとされてい
る。As described above, if the technique of the above document is used,
Even if the input power supply 9 or the load 10 changes suddenly, the input current Iin is maintained in a sine wave, and the load of the load 10
And the storage battery 3 can be supplied with stable power.

【００１０】[0010]

【発明が解決しようとする課題】無停電電源装置は、コ
ンピュータ機器に最も広く使用される。これらのコンピ
ュータ機器は、５，７，９，１１次などの低次の高調波
を多く含む。The uninterruptible power supply is most widely used in computer equipment. These computer devices contain many low-order harmonics such as the fifth, seventh, ninth, and eleventh orders.

【００１１】前記従来の無停電電源装置においては、第
２交直変換器２が負荷に供給する電力を平均値で計算
し、入力電流Ｉinを正弦波に保てば、充電電流が高調波
の分だけ減少するとしている。In the conventional uninterruptible power supply, the power supplied to the load by the second AC / DC converter 2 is calculated as an average value, and if the input current Iin is maintained as a sine wave, the charging current is reduced to the harmonic. Only to decrease.

【００１２】充電電流が高調波に比べて充分大きけれ
ば、問題は無い。しかし、蓄電池３が満充電に近くなる
と、充電電流を小さくしなければならないので、直流部
から負荷１０に高調波成分を含む電力を供給することに
なる。このとき、蓄電池３を放電させないためには、蓄
電池放電防止用リアクトル１５を挿入し、蓄電池３の低
次高調波に対するインピーダンスを直流コンデンサ６に
対して充分大きくする必要がある。There is no problem if the charging current is sufficiently large compared to the harmonics. However, when the storage battery 3 is almost fully charged, the charging current must be reduced, so that the DC part supplies power including harmonic components to the load 10. At this time, in order to prevent the storage battery 3 from being discharged, it is necessary to insert the storage battery discharge prevention reactor 15 and make the impedance of the storage battery 3 with respect to the low-order harmonics sufficiently higher than the DC capacitor 6.

【００１３】図１１は、図１０に示した従来の無停電電
源装置における電圧電流波形を示す図である。出力電圧
Ｖoutと入力電流Ｉinとは、正弦波となるように制御さ
れている。負荷１０は、コンピュータ機器を想定してい
るので、負荷電流Ｉoutは、低次の高調波を多く含む波
形となる。リアクトル１５の働きで、充電電流Ｉbatt
は、ほぼ直流であるが、直流コンデンサ６の電流ＩCdc
としては、第１交直変換器１のスイッチングに伴う高次
の高調波成分の他に、出力電流Ｉoutの低次の高調波成
分が流れる。FIG. 11 is a diagram showing voltage and current waveforms in the conventional uninterruptible power supply shown in FIG. The output voltage Vout and the input current Iin are controlled to have a sine wave. Since the load 10 is assumed to be a computer device, the load current Iout has a waveform including many low-order harmonics. By the operation of the reactor 15, the charging current Ibatt
Is almost DC, but the current ICdc of the DC capacitor 6 is
As a result, a low-order harmonic component of the output current Iout flows in addition to a high-order harmonic component accompanying the switching of the first AC / DC converter 1.

【００１４】そこで、直流コンデンサ６のリプル耐量を
大きくする必要がある。蓄電池放電防止用リアクトル１
５と大きなリプル耐量の直流コンデンサ６とが必要なこ
とから、無停電電源装置の体積が大きくなる。また、制
御演算が複雑となるために、高機能のマイクロコンピュ
ータを搭載しなければならない。Therefore, it is necessary to increase the ripple resistance of the DC capacitor 6. Reactor 1 for battery discharge prevention
5 and a DC capacitor 6 having a large ripple resistance, the volume of the uninterruptible power supply becomes large. In addition, since the control operation becomes complicated, a high-performance microcomputer must be mounted.

【００１５】本発明の目的は、直流コンデンサのリプル
耐量を上げたり、蓄電池放電防止用リアクトルを設けた
りせずに、第１交直変換器と第２交直変換器との間で電
力を授受するとともに、蓄電池を安定に充電できる無停
電電源装置を提供することである。An object of the present invention is to supply and receive power between a first AC / DC converter and a second AC / DC converter without increasing the ripple resistance of a DC capacitor or providing a reactor for preventing storage battery discharge. Another object of the present invention is to provide an uninterruptible power supply capable of stably charging a storage battery.

【００１６】[0016]

【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、入力端に接続した外部交流電源から交流
電力を導入し、第１交直変換器の交流側を出力端に並列
接続し、第２交直変換器の交流側を入力端と出力端との
間に直列接続し、第１交直変換器および第２交直変換器
の直流側に直流電力貯蔵手段および直流コンデンサを並
列接続し、通常時は出力端に接続された負荷に交流電力
を供給するとともに直流電力貯蔵手段を充電しておき、
外部交流電源の停電時に第１交直変換器が直流電力貯蔵
手段の直流電力を交流電力に変換し負荷に供給する無停
電電源装置において、第１交直変換器および第２交直変
換器の瞬時電力をそれぞれ検出しまたは推定する手段
と、外部交流電源からの入力電圧と第２交直変換器の交
流側電圧との和が所定の出力電圧になるように第２交直
変換器を制御する手段と、第２交直変換器が出力する瞬
時電力と直流電力貯蔵手段への瞬時充電電力とを供給す
るように第１交直変換器を制御する手段とを備えた無停
電電源装置を提案する。According to the present invention, in order to achieve the above object, AC power is introduced from an external AC power supply connected to an input terminal, and the AC side of the first AC / DC converter is connected in parallel to an output terminal. The AC side of the second AC / DC converter is connected in series between the input terminal and the output terminal, and the DC power storage means and the DC capacitor are connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter. Normally, the AC power is supplied to the load connected to the output terminal and the DC power storage means is charged,
In an uninterruptible power supply in which a first AC / DC converter converts DC power of DC power storage means into AC power and supplies it to a load at the time of a power failure of an external AC power supply, the instantaneous power of the first AC / DC converter and the second AC / DC converter is Means for respectively detecting or estimating; means for controlling the second AC / DC converter so that the sum of the input voltage from the external AC power supply and the AC side voltage of the second AC / DC converter becomes a predetermined output voltage; An uninterruptible power supply device is provided that includes means for controlling the first AC / DC converter so as to supply the instantaneous power output from the two-AC / DC converter and the instantaneous charging power to the DC power storage means.

【００１７】本発明は、また、入力端に接続した外部交
流電源から交流電力を導入し、第１交直変換器の交流側
を出力端に並列接続し、第２交直変換器の交流側を入力
端と出力端との間に直列接続し、第１交直変換器および
第２交直変換器の直流側に直流電力貯蔵手段および直流
コンデンサを並列接続し、通常時は出力端に接続された
負荷に交流電力を供給するとともに直流電力貯蔵手段を
充電しておき、外部交流電源の停電時に第１交直変換器
が直流電力貯蔵手段の直流電力を交流電力に変換し負荷
に供給する無停電電源装置において、第１交直変換器の
交流側電流を検出する手段と、第２交直変換器の直流側
電流を検出する手段と、直流電力貯蔵手段の充電電流お
よび直流電圧を検出する手段と、無停電電源装置の出力
電圧を検出する手段と、第２交直変換器の直流側電流検
出値の高次の高調波成分を除去する手段とを備え、外部
交流電源からの入力電圧と第２交直変換器の交流側電圧
との和が所定の出力電圧になるように第２交直変換器を
制御する手段と、直流電圧の検出値に応じた充電電流の
指令値を算出し、充電電流の指令値と充電電流の検出値
との誤差成分と第２交直変換器の直流側電流検出値の高
次の高調波を除去した値との和を出力電圧の検出値が正
か負かにより正負を反転させ、第１交直変換器の交流側
電流の指令値とし、第１交直変換器の交流側電流の検出
値を指令値に追従させる手段とを備えた無停電電源装置
を提案する。According to the present invention, AC power is introduced from an external AC power supply connected to the input terminal, the AC side of the first AC / DC converter is connected in parallel to the output terminal, and the AC side of the second AC / DC converter is connected to the input side. The DC power storage means and the DC capacitor are connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and normally connected to the load connected to the output end. In an uninterruptible power supply for supplying AC power and charging DC power storage means, and in the event of a power failure of an external AC power supply, a first AC / DC converter converts DC power of DC power storage means into AC power and supplies it to a load. Means for detecting the AC side current of the first AC / DC converter, means for detecting the DC side current of the second AC / DC converter, means for detecting the charging current and DC voltage of the DC power storage means, and an uninterruptible power supply. Hand to detect the output voltage of the device Means for removing higher-order harmonic components of the DC-side current detection value of the second AC / DC converter, wherein the sum of the input voltage from the external AC power supply and the AC-side voltage of the second AC / DC converter is predetermined. Means for controlling the second AC / DC converter so that the output voltage of the second AC / DC converter becomes equal to an output voltage of the DC / DC converter; The sum of the detected value of the DC-side current of the second AC / DC converter and the value obtained by removing higher-order harmonics is inverted between positive and negative depending on whether the detected value of the output voltage is positive or negative, and the AC side of the first AC / DC converter. The present invention proposes an uninterruptible power supply device comprising: a means for causing a detected value of the AC side current of the first AC / DC converter to follow the command value as a current command value.

【００１８】本発明は、さらに、入力端に接続した外部
交流電源から交流電力を導入し、第１交直変換器の交流
側を出力端に並列接続し、第２交直変換器の交流側を入
力端と出力端との間に直列接続し、第１交直変換器およ
び第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は出力端に接続され
た負荷に交流電力を供給するとともに直流電力貯蔵手段
を充電しておき、外部交流電源の停電時に第１交直変換
器が直流電力貯蔵手段の直流電力を交流電力に変換し負
荷に供給する無停電電源装置において、第１交直変換器
の直流側電流および交流側電流を検出する手段と、第２
交直変換器の直流側電流を検出する手段と、直流電力貯
蔵手段の直流電圧を検出する手段と、無停電電源装置の
出力電圧を検出する手段と、第１交直変換器の直流側電
流検出値および第２交直変換器の直流側電流検出値の高
次の高調波成分をそれぞれ除去する手段とを備え、外部
交流電源からの入力電圧と第２交直変換器の交流側電圧
との和が所定の出力電圧となるように第２交直変換器を
制御する手段と、直流電圧の検出値に応じた充電電流の
指令値を算出し、充電電流の指令値および第２交直変換
器の直流側電流検出値の高次の高調波を除去した値の和
と第１交直変換器の直流側電流の検出値の高次の高調波
を除去した値との差の成分を出力電圧の検出値が正か負
かにより正負を反転させ、第１交直変換器の交流側電流
の指令値とし、第１交直変換器の交流側電流の検出値を
指令値に追従させる手段とを備えた無停電電源装置を提
案する。According to the present invention, further, AC power is introduced from an external AC power supply connected to the input terminal, the AC side of the first AC / DC converter is connected in parallel to the output terminal, and the AC side of the second AC / DC converter is input. The DC power storage means and the DC capacitor are connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and normally connected to the load connected to the output end. In an uninterruptible power supply for supplying AC power and charging DC power storage means, and in the event of a power failure of an external AC power supply, a first AC / DC converter converts DC power of DC power storage means into AC power and supplies it to a load. Means for detecting the DC side current and the AC side current of the first AC / DC converter;
Means for detecting the DC side current of the AC / DC converter, means for detecting the DC voltage of the DC power storage means, means for detecting the output voltage of the uninterruptible power supply, and the DC side current detection value of the first AC / DC converter Means for removing higher-order harmonic components of the DC-side current detection value of the second AC / DC converter, wherein the sum of the input voltage from the external AC power supply and the AC-side voltage of the second AC / DC converter is predetermined. Means for controlling the second AC / DC converter so that the output voltage of the second AC / DC converter becomes equal to the output voltage of the second AC / DC converter; calculating the command value of the charging current in accordance with the detected value of the DC voltage; The component of the difference between the sum of the detected values from which higher-order harmonics have been removed and the value of the DC-side current of the first AC / DC converter from which higher-order harmonics have been removed is the positive value of the detected value of the output voltage. The polarity is reversed depending on whether the current is negative or negative. Suggest uninterruptible power and means to follow the command value detected value of the AC side current of the AC-DC converter.

【００１９】本発明は、入力端に接続した外部交流電源
から交流電力を導入し、第１交直変換器の交流側を出力
端に並列接続し、第２交直変換器の交流側を入力端と出
力端との間に直列接続し、第１交直変換器および第２交
直変換器の直流側に直流電力貯蔵手段および直流コンデ
ンサを並列接続し、通常時は出力端に接続された負荷に
交流電力を供給するとともに直流電力貯蔵手段を充電し
ておき、外部交流電源の停電時に第１交直変換器が直流
電力貯蔵手段の直流電力を交流電力に変換し負荷に供給
する無停電電源装置において、第１交直変換器の交流側
電流を検出する手段と、第２交直変換器の直流側電流を
検出する手段と、直流電力貯蔵手段の直流電圧を検出す
る手段と、無停電電源装置の出力電圧を検出する手段
と、第２交直変換器の直流側電流検出値の高次の高調波
成分を除去する手段とを備え、外部交流電源からの入力
電圧と第２交直変換器の交流側電圧との和が所定の出力
電圧となるように第２交直変換器を制御する手段と、直
流電圧の検出値に応じた充電電流の指令値を算出し、充
電電流の指令値と第２交直変換器の直流側電流の検出値
の高次の高調波を除去した値との和を出力電圧の検出値
が正か負かにより正負を反転させ、第１交直変換器の交
流側電流の指令値とし、第１交直変換器の交流側電流の
検出値に出力電圧の検出値と直流電圧の検出値との比を
掛けた値を第１交直変換器の交流側電流の指令値に追従
させる手段とを備えた無停電電源装置を提案する。According to the present invention, AC power is introduced from an external AC power supply connected to the input terminal, the AC side of the first AC / DC converter is connected in parallel to the output terminal, and the AC side of the second AC / DC converter is connected to the input terminal. DC power storage means and a DC capacitor are connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and the AC power is normally supplied to the load connected to the output end. And the DC power storage means is charged and the first AC / DC converter converts the DC power of the DC power storage means into AC power and supplies the AC power to the load when the external AC power supply fails. A means for detecting the AC side current of the AC / DC converter, a means for detecting the DC side current of the second AC / DC converter, a means for detecting the DC voltage of the DC power storage means, and the output voltage of the uninterruptible power supply. Detecting means and a second AC / DC converter Means for removing a higher-order harmonic component of the DC-side current detection value, and wherein the sum of the input voltage from the external AC power supply and the AC-side voltage of the second AC / DC converter becomes a predetermined output voltage. Means for controlling the two AC / DC converters; calculating a charging current command value in accordance with the detected DC voltage value; and calculating a higher order harmonic of the charging current command value and the detected DC side current value of the second AC / DC converter. The sum of the value obtained by removing the wave is inverted between positive and negative depending on whether the detected value of the output voltage is positive or negative, and is used as a command value of the AC side current of the first AC / DC converter, and the AC side current of the first AC / DC converter is detected. Means for following a command value of the AC side current of the first AC / DC converter with a value obtained by multiplying the value by the ratio of the detected value of the output voltage to the detected value of the DC voltage.

【００２０】本発明は、また、入力端に接続した外部交
流電源から交流電力を導入し、第１交直変換器の交流側
を出力端に並列接続し、第２交直変換器の交流側を入力
端と出力端との間に直列接続し、第１交直変換器および
第２交直変換器の直流側に直流電力貯蔵手段および直流
コンデンサを並列接続し、通常時は出力端に接続された
負荷に交流電力を供給するとともに直流電力貯蔵手段を
充電しておき、外部交流電源の停電時に第１交直変換器
が直流電力貯蔵手段の直流電力を交流電力に変換し負荷
に供給する無停電電源装置において、第１交直変換器の
交流側電流を検出する手段と、第２交直変換器の交流側
電流および電圧を検出する手段と、直流電力貯蔵手段の
直流電圧を検出する手段と、無停電電源装置の出力電圧
を検出する手段とを備え、外部交流電源からの入力電圧
と第２交直変換器の交流側電圧との和が所定の出力電圧
となるように第２交直変換器を制御する手段と、直流電
圧の検出値に応じた充電電流の指令値を算出し、第２交
直変換器の交流側電流の検出値に第２交直変換器の交流
側電圧の検出値と直流電圧の検出値との比を掛けて第２
交直変換器の直流側電流の検出値とし、充電電流の指令
値と第２交直変換器の直流側電流の検出値との和を出力
電圧の検出値が正か負かにより正負を反転させ、第１交
直変換器の交流側電流の指令値とし、第１交直変換器の
交流側電流の検出値に出力電圧の検出値と直流電圧の検
出値との比を掛けた値を第１交直変換器の交流側電流の
指令値に追従させる手段とを備えた無停電電源装置を提
案する。According to the present invention, AC power is introduced from an external AC power supply connected to the input terminal, the AC side of the first AC / DC converter is connected in parallel to the output terminal, and the AC side of the second AC / DC converter is connected to the input side. The DC power storage means and the DC capacitor are connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and normally connected to the load connected to the output end. In an uninterruptible power supply for supplying AC power and charging DC power storage means, and in the event of a power failure of an external AC power supply, a first AC / DC converter converts DC power of DC power storage means into AC power and supplies it to a load. Means for detecting the AC side current of the first AC / DC converter, means for detecting the AC side current and voltage of the second AC / DC converter, means for detecting the DC voltage of the DC power storage means, and an uninterruptible power supply. Means for detecting the output voltage of the Means for controlling the second AC / DC converter so that the sum of the input voltage from the external AC power supply and the AC side voltage of the second AC / DC converter becomes a predetermined output voltage; The command value of the charging current is calculated, and the detected value of the AC side current of the second AC / DC converter is multiplied by the ratio of the detected value of the AC side voltage and the detected value of the DC voltage of the second AC / DC converter to obtain the second value.
As a detection value of the DC side current of the AC / DC converter, the sum of the command value of the charging current and the detection value of the DC side current of the second AC / DC converter is inverted between positive and negative depending on whether the detection value of the output voltage is positive or negative, A command value of the AC side current of the first AC / DC converter, and a value obtained by multiplying a detected value of the AC side current of the first AC / DC converter by a ratio of a detected value of the output voltage to a detected value of the DC voltage is the first AC / DC conversion. Means for following the command value of the AC side current of the unit.

【００２１】本発明は、さらに、入力端に接続した外部
交流電源から交流電力を導入し、第１交直変換器の交流
側を出力端に並列接続し、第２交直変換器の交流側を入
力端と出力端との間に直列接続し、第１交直変換器およ
び第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は出力端に接続され
た負荷に交流電力を供給するとともに直流電力貯蔵手段
を充電しておき、外部交流電源の停電時に第１交直変換
器が直流電力貯蔵手段の直流電力を交流電力に変換し負
荷に供給する無停電電源装置において、第１交直変換器
の交流側電流を検出する手段と、第２交直変換器の交流
側電流を検出する手段と、直流電力貯蔵手段の直流電圧
を検出する手段と、無停電電源装置の出力電圧を検出す
る手段とを備え、外部交流電源からの入力電圧と第２交
直変換器の交流側電圧との和が所定の出力電圧となるよ
うに第２交直変換器を制御する手段と、直流電圧の検出
値に応じた充電電流の指令値を算出し、第２交直変換器
の交流側電流の検出値に第２交直変換器の交流側電圧の
指令値と直流電圧の検出値との比を掛けて第２交直変換
器の直流側電流の検出値とし、充電電流の指令値と第２
交直変換器の直流側電流の検出値との和を出力電圧の検
出値が正か負かにより正負を反転させ、第１交直変換器
の交流側電流の指令値とし、第１交直変換器の交流側電
流の検出値に出力電圧の検出値と直流電圧の検出値との
比を掛けた値を第１交直変換器の交流側電流の指令値に
追従させる手段とを備えた無停電電源装置を提案する。According to the present invention, further, AC power is introduced from an external AC power supply connected to the input terminal, the AC side of the first AC / DC converter is connected in parallel to the output terminal, and the AC side of the second AC / DC converter is connected to the input side. The DC power storage means and the DC capacitor are connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and normally connected to the load connected to the output end. In an uninterruptible power supply for supplying AC power and charging DC power storage means, and in the event of a power failure of an external AC power supply, a first AC / DC converter converts DC power of DC power storage means into AC power and supplies it to a load. Means for detecting the AC side current of the first AC / DC converter, means for detecting the AC side current of the second AC / DC converter, means for detecting the DC voltage of the DC power storage means, and the output of the uninterruptible power supply. Means for detecting a voltage, Means for controlling the second AC / DC converter so that the sum of the input voltage from the external AC power supply and the AC side voltage of the second AC / DC converter becomes a predetermined output voltage, and a charging current according to the detected value of the DC voltage Of the second AC / DC converter, multiplying the detected value of the AC side current of the second AC / DC converter by the ratio between the command value of the AC side voltage of the second AC / DC converter and the detected value of the DC voltage. The command value of the charging current and the second
The sum of the detected value of the DC side current of the AC / DC converter is inverted between positive and negative depending on whether the detected value of the output voltage is positive or negative, and is used as the command value of the AC side current of the first AC / DC converter. Means for causing a value obtained by multiplying the ratio of the detected value of the output voltage to the detected value of the DC voltage to the detected value of the AC side current to follow the command value of the AC side current of the first AC / DC converter. Suggest.

【００２２】[0022]

【発明の実施の形態】《実施例１》図１は、本発明によ
る無停電電源装置の実施例１の系統構成を示すブロック
図である。第１交直変換器１の交流側は、巻数比１：ｎ
１の変圧器４を介して、出力端に並列接続してあり、フ
ィルタ用コンデンサ７も、出力端に並列接続してある。
この出力端には、負荷１０が接続される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a system configuration of Embodiment 1 of an uninterruptible power supply according to the present invention. The AC side of the first AC / DC converter 1 has a turns ratio of 1: n
It is connected in parallel to the output terminal via one transformer 4, and the filter capacitor 7 is also connected in parallel to the output terminal.
The load 10 is connected to this output terminal.

【００２３】外部交流電源９が接続されている入力端か
らは、スイッチ１３を介して、交流電力が導入される。
第２交直変換器２の交流側は、巻数比１：ｎ２の変圧器
５を介して、入力端と出力端との間に直列接続してあ
る。変圧器５と並列に、フィルタ用コンデンサ８を接続
する。From an input terminal to which the external AC power supply 9 is connected, AC power is introduced via a switch 13.
The AC side of the second AC / DC converter 2 is connected in series between an input terminal and an output terminal via a transformer 5 having a turns ratio of 1: n2. A filter capacitor 8 is connected in parallel with the transformer 5.

【００２４】第１交直変換器１および第２交直変換器２
の直流側は、蓄電池３および直流コンデンサ６に並列接
続してある。First AC-DC converter 1 and second AC-DC converter 2
Is connected in parallel to the storage battery 3 and the DC capacitor 6.

【００２５】検出器１１１は、第１交直変換器１の交流
側電流Ｉinv1acを検出する。検出器１１２は、第２交直
変換器２の直流側電流を検出する。検出器１１３は、蓄
電池３の充電電流Ｉbattを検出する。検出器１１４は、
出力電圧Ｖoutを検出する。検出器１１５は、直流電圧
Ｖdcを検出する。ローパスフィルタ１６１は、直流側電
流から高次の高調波成分をカットした直流側電流Ｉinv2
dcを出力する。The detector 111 detects the AC side current Iinv1ac of the first AC / DC converter 1. Detector 112 detects the DC side current of second AC / DC converter 2. Detector 113 detects charging current Ibatt of storage battery 3. The detector 114 is
The output voltage Vout is detected. Detector 115 detects DC voltage Vdc. The low-pass filter 161 is a DC-side current Iinv2 obtained by cutting high-order harmonic components from the DC-side current.
Output dc.

【００２６】指令値出力手段１２１は、直流電圧Ｖdcに
応じた充電電流指令値Ｉbatt_refを出力する。演算増幅
器１２２は、充電電流指令値Ｉbatt_refと充電電流Ｉba
ttとの誤差を増幅する。The command value output means 121 outputs a charging current command value Ibatt_ref according to the DC voltage Vdc. The operational amplifier 122 calculates the charging current command value Ibatt_ref and the charging current Iba
Amplify the error with tt.

【００２７】正負極性判定手段１２３は、出力電圧Ｖou
tの正負極性を出力する。すなわち、出力電圧Ｖoutが正
のとき、１を出力し、負のとき、−１を出力する。The positive / negative polarity determining means 123 outputs the output voltage Vou
Outputs the positive and negative polarity of t. That is, when the output voltage Vout is positive, 1 is output, and when it is negative, -1 is output.

【００２８】充電電流指令値Ｉbatt_refおよび充電電流
Ｉbattの誤差成分と直流側電流Ｉinv2dcとを加算し、正
負極性判定手段１２３の出力を掛けると、第１交直変換
器１の交流側電流指令値Ｉinv1ac_refとなる。制御手段
１２４は、交流側電流Ｉinv1acが交流側電流指令値Ｉin
vac_refを追従するように、第１交直変換器１を制御す
る。When an error component between the charging current command value Ibatt_ref and the charging current Ibatt is added to the DC current Iinv2dc and multiplied by the output of the positive / negative polarity determining means 123, the AC current command value Iinv1ac_ref of the first AC / DC converter 1 is obtained. Become. The control means 124 determines that the AC side current Iinv1ac is equal to the AC side current command value Iin.
The first AC / DC converter 1 is controlled so as to follow vac_ref.

【００２９】基準値出力手段１２５は、出力電圧基準値
Ｖout_refを出力する。指令値出力手段１２６は、出力
電圧Ｖoutが出力電圧基準値Ｖout_refとなるように第２
交直変換器２の交流側電圧指令値Ｖ2ac_refを出力す
る。制御手段１２７は、交流側電圧指令値Ｖ2ac_refに
基づいて、第２交直変換器２を制御する。The reference value output means 125 outputs an output voltage reference value Vout_ref. The command value output means 126 outputs the second command so that the output voltage Vout becomes the output voltage reference value Vout_ref.
An AC-side voltage command value V2ac_ref of the AC / DC converter 2 is output. The control means 127 controls the second AC / DC converter 2 based on the AC-side voltage command value V2ac_ref.

【００３０】図２は、図１に示した無停電電源装置にお
ける電圧電流波形を示す図である。出力電圧Ｖoutは、
一定の振幅の正弦波となる。負荷１０が、コンピュータ
機器である場合、交流側入力電流Ｉin，交流側出力電流
Ｉoutは、低次の高調波を多く含む波形となる。充電電
流Ｉbattは、出力電圧Ｖoutの２倍の周波数のリプル電
流を含むが、直流コンデンサ６の電流ＩＣdcは、第１交
直変換器１のスイッチングに伴う高次の高調波電流のみ
である。FIG. 2 is a diagram showing voltage and current waveforms in the uninterruptible power supply shown in FIG. The output voltage Vout is
It becomes a sine wave of constant amplitude. When the load 10 is a computer device, the AC-side input current Iin and the AC-side output current Iout have waveforms including many low-order harmonics. The charging current Ibatt includes a ripple current having a frequency twice the frequency of the output voltage Vout, but the current ICdc of the DC capacitor 6 is only a higher-order harmonic current accompanying the switching of the first AC / DC converter 1.

【００３１】ここでは、無停電電源装置が、外部交流電
源９からの入力電圧Ｖinと第２交直変換器２の交流側電
圧との和を出力電圧Ｖoutとする場合の動作を説明し
た。Here, the operation of the uninterruptible power supply in the case where the sum of the input voltage Vin from the external AC power supply 9 and the AC side voltage of the second AC / DC converter 2 is used as the output voltage Vout has been described.

【００３２】第２交直変換器２は、出力電圧Ｖoutを一
定にするため、入力電圧Ｖinが低いときは、昇圧し、入
力電圧Ｖinが高いときは、降圧する。The second AC / DC converter 2 boosts the voltage when the input voltage Vin is low and decreases the voltage when the input voltage Vin is high in order to keep the output voltage Vout constant.

【００３３】外部交流電源９が停電した場合は、スイッ
チ１３が開き、第１交直変換器１が蓄電池３の電力を交
流に変換し、負荷１０に供給する。When the external AC power supply 9 is out of power, the switch 13 is opened, and the first AC / DC converter 1 converts the power of the storage battery 3 into AC and supplies it to the load 10.

【００３４】本実施例１において、充電電流Ｉbattと直
流側電流Ｉinv2dcとを検出すると、Ｖdc＝１とした場合
の蓄電池３と第２交直変換器２との瞬時電力をそれぞれ
検出していることになる。直流側電流Ｉinv2dcをフィー
ドフォワード項として、充電電流指令値Ｉbatt_refおよ
び充電電流Ｉbattの誤差成分をゼロとするように、交流
側電流指令値Ｉinv1ac_refを制御すると、第１交直変換
器１は、蓄電池３の瞬時充電電力と第２交直変換器２の
瞬時出力電圧とを正確に供給できる。In the first embodiment, when the charging current Ibatt and the DC side current Iinv2dc are detected, the instantaneous power of the storage battery 3 and the second AC / DC converter 2 when Vdc = 1 is detected. Become. When the AC side current command value Iinv1ac_ref is controlled such that the error component between the charging current command value Ibatt_ref and the charging current Ibatt is set to zero using the DC current Iinv2dc as a feedforward term, the first AC / DC converter 1 The instantaneous charging power and the instantaneous output voltage of the second AC / DC converter 2 can be accurately supplied.

【００３５】ローパスフィルタ１６１が、高次の高調波
成分をカットするので、第１交直変換器１は、第２交直
変換器２が出力する低次の高調波成分のみを供給すれば
よいことになる。直流コンデンサ６には、高次の高調波
は流れるが、低次の高調波と比較して、リプル耐量を小
さくできる。Since the low-pass filter 161 cuts high-order harmonic components, the first AC / DC converter 1 only needs to supply the low-order harmonic components output from the second AC / DC converter 2. Become. Although high-order harmonics flow through the DC capacitor 6, the ripple resistance can be reduced as compared with low-order harmonics.

【００３６】また、入力電圧Ｖinと第２交直変換器２の
交流側電圧との和を出力し、入力電圧Ｖinの大小に応じ
て昇圧または降圧するので、負荷１０に安定した電圧を
供給できる。Further, since the sum of the input voltage Vin and the AC side voltage of the second AC / DC converter 2 is output and the voltage is increased or decreased in accordance with the magnitude of the input voltage Vin, a stable voltage can be supplied to the load 10.

【００３７】《実施例２》図３は、本発明による無停電
電源装置の実施例２の系統構成を示すブロック図であ
る。第１交直変換器１の交流側は、巻数比１：ｎ１の変
圧器４を介して、出力端に並列接続してあり、フィルタ
用コンデンサ７も、出力端に並列接続してある。この出
力端には、負荷１０が接続される。Embodiment 2 FIG. 3 is a block diagram showing a system configuration of an uninterruptible power supply according to Embodiment 2 of the present invention. The AC side of the first AC / DC converter 1 is connected in parallel to an output terminal via a transformer 4 having a turns ratio of 1: n1, and a filter capacitor 7 is also connected in parallel to the output terminal. The load 10 is connected to this output terminal.

【００３８】外部交流電源９が接続されている入力端か
らは、スイッチ１３を介して、交流電力が導入される。
第２交直変換器２の交流側は、巻数比１：ｎ２の変圧器
５を介して、入力端と出力端との間に直列接続してあ
る。変圧器５と並列に、フィルタ用コンデンサ８を接続
する。From the input terminal to which the external AC power supply 9 is connected, AC power is introduced via the switch 13.
The AC side of the second AC / DC converter 2 is connected in series between an input terminal and an output terminal via a transformer 5 having a turns ratio of 1: n2. A filter capacitor 8 is connected in parallel with the transformer 5.

【００３９】第１交直変換器１および第２交直変換器２
の直流側は、蓄電池３および直流コンデンサ６に並列接
続してある。First AC / DC converter 1 and second AC / DC converter 2
Is connected in parallel to the storage battery 3 and the DC capacitor 6.

【００４０】検出器１１１は、第１交直変換器１の交流
側電流Ｉinv1acを検出する。検出器１１２は、第２交直
変換器２の直流側電流を検出する。検出器１１４は、出
力電圧Ｖoutを検出する。検出器１１５は、直流電圧Ｖd
cを検出する。検出器１１６は、第１交直変換器１の直
流側電流を検出する。ローパスフィルタ１６１は、直流
側電流から高次の高調波成分をカットしたＩinv2dcを出
力し、ローパスフィルタ１６２は、直流側電流から高次
の高調波成分をカットしたＩinv1dcを出力する。The detector 111 detects the AC side current Iinv1ac of the first AC / DC converter 1. Detector 112 detects the DC side current of second AC / DC converter 2. The detector 114 detects the output voltage Vout. The detector 115 detects the DC voltage Vd
Detect c. Detector 116 detects the DC current of first AC / DC converter 1. The low-pass filter 161 outputs Iinv2dc obtained by cutting high-order harmonic components from the DC current, and the low-pass filter 162 outputs Iinv1dc obtained by cutting high-order harmonic components from the DC current.

【００４１】指令値出力手段１２１は、直流電圧Ｖdcに
応じた充電電流指令値Ｉbatt_refを出力する。演算増幅
器１２２は、充電電流Ｉbattおよび直流側電流Ｉinv2dc
の和と直流側電流Ｉinv1dcとの誤差を増幅する手段であ
る。The command value output means 121 outputs a charging current command value Ibatt_ref according to the DC voltage Vdc. The operational amplifier 122 includes a charging current Ibatt and a DC side current Iinv2dc.
Is a means for amplifying an error between the sum of the current and the DC side current Iinv1dc.

【００４２】正負極性判定手段１２３は、Ｖoutの正負
極性を出力する。出力電圧Ｖoutが正のとき、１を出力
し、負のとき、−１を出力する。The positive / negative polarity determining means 123 outputs the positive / negative polarity of Vout. When the output voltage Vout is positive, 1 is output, and when it is negative, -1 is output.

【００４３】充電電流指令値Ｉbatt_refおよび直流側電
流Ｉinv2dcの和と直流側電流Ｉinv1dcとの誤差のＫ2倍
の値に、正負極性判定手段１２３の出力を掛けると、第
１交直変換器１の交流側電流指令値Ｉinv1ac_refとな
る。制御手段１２４は、交流側電流Ｉinv1acが交流側電
流指令値Ｉinvac_refを追従するように、第１交直変換
器１を制御する。When the output of the positive / negative polarity determining means 123 is multiplied by K2 times the error between the sum of the charging current command value Ibatt_ref and the DC side current Iinv2dc and the DC side current Iinv1dc, the AC side of the first AC / DC converter 1 is obtained. It becomes the current command value Iinv1ac_ref. The control means 124 controls the first AC / DC converter 1 so that the AC-side current Iinv1ac follows the AC-side current command value Iinvac_ref.

【００４４】基準値出力手段１２５は、出力電圧基準値
Ｖout_refを出力する。指令値出力手段１２６は、出力
電圧Ｖoutが出力電圧基準値Ｖout_refとなるように、第
２交直変換器２の交流側電圧指令値Ｖ2ac_refを出力す
る。制御手段１２７は、交流側電圧指令値Ｖ2ac_refに
基づいて、第２交直変換器２を制御する。The reference value output means 125 outputs an output voltage reference value Vout_ref. The command value output means 126 outputs the AC side voltage command value V2ac_ref of the second AC / DC converter 2 so that the output voltage Vout becomes the output voltage reference value Vout_ref. The control means 127 controls the second AC / DC converter 2 based on the AC-side voltage command value V2ac_ref.

【００４５】ここでは、無停電電源装置が、外部交流電
源９からの入力電圧Ｖinと第２交直変換器２の交流側電
圧との和を出力電圧Ｖoutとする場合の動作を説明し
た。Here, the operation in the case where the uninterruptible power supply sets the output voltage Vout as the sum of the input voltage Vin from the external AC power supply 9 and the AC side voltage of the second AC / DC converter 2 has been described.

【００４６】第２交直変換器２は、出力電圧Ｖoutを一
定にするため、入力電圧Ｖinが低いときは、昇圧し、入
力電圧Ｖinが高いときは、降圧する。The second AC / DC converter 2 boosts the voltage when the input voltage Vin is low and decreases the voltage when the input voltage Vin is high, in order to keep the output voltage Vout constant.

【００４７】外部交流電源９が停電した場合は、スイッ
チ１３を開き、第１交直変換器１が蓄電池３の電力を交
流に変換し、負荷１０に供給する。When the external AC power supply 9 is out of power, the switch 13 is opened, and the first AC / DC converter 1 converts the power of the storage battery 3 into AC and supplies it to the load 10.

【００４８】本実施例２において、直流側電流Ｉinv1dc
と直流側電流Ｉinv2dcを検出すると、Ｖdc＝１とした場
合の第１交直変換器１と第２交直変換器２のそれぞれの
瞬時電力を検出したことになる。充電電流指令値Ｉbatt
_refおよび直流側電流Ｉinv2dcの和が直流側電流Ｉinv1
dcと等しくなるように交流側電圧指令値Ｉinv1ac_refを
制御すると、第１交直変換器１は、蓄電池３の瞬時充電
電力と第２交直変換器２の瞬時出力電力とを供給でき
る。In the second embodiment, the DC side current Iinv1dc
When the DC-side current Iinv2dc is detected, the instantaneous power of each of the first AC-DC converter 1 and the second AC-DC converter 2 when Vdc = 1 is detected. Charge current command value Ibatt
_ref and the DC side current Iinv2dc are the DC side current Iinv1
When the AC side voltage command value Iinv1ac_ref is controlled to be equal to dc, the first AC / DC converter 1 can supply the instantaneous charging power of the storage battery 3 and the instantaneous output power of the second AC / DC converter 2.

【００４９】ローパスフィルタ１６１および１６２が、
高次の高調波成分をカットするので、第１交直変換器１
は、第２交直変換器２が出力する低次の高調波成分のみ
を供給すればよいことになる。直流コンデンサ６には、
高次の高調波は流れるが、低次の高調波と比較して、リ
プル耐量を小さくできる。The low-pass filters 161 and 162 are
Since high-order harmonic components are cut, the first AC / DC converter 1
Means that only the low-order harmonic components output from the second AC / DC converter 2 need to be supplied. DC capacitor 6 has
Although higher-order harmonics flow, the ripple resistance can be reduced as compared with lower-order harmonics.

【００５０】また、入力電圧Ｖinと第２交直変換器２の
交流側電圧との和を出力し、入力電圧Ｖinの大小に応じ
て昇圧または降圧するので、負荷１０に安定した電圧を
供給できる。Also, the output of the sum of the input voltage Vin and the AC side voltage of the second AC / DC converter 2 is stepped up or down in accordance with the magnitude of the input voltage Vin, so that a stable voltage can be supplied to the load 10.

【００５１】《実施例３》図４は、本発明による無停電
電源装置の実施例３の系統構成を示すブロック図であ
る。第１交直変換器１の交流側は、巻数比１：ｎ１の変
圧器４を介して、出力端に並列接続してあり、フィルタ
用コンデンサ７も、出力端に並列接続してある。この出
力端には、負荷１０が接続される。Third Embodiment FIG. 4 is a block diagram showing a system configuration of a third embodiment of the uninterruptible power supply according to the present invention. The AC side of the first AC / DC converter 1 is connected in parallel to an output terminal via a transformer 4 having a turns ratio of 1: n1, and a filter capacitor 7 is also connected in parallel to the output terminal. The load 10 is connected to this output terminal.

【００５２】外部交流電源９が接続されている入力端か
らは、スイッチ１３を介して、交流電力が導入される。
第２交直変換器２の交流側は、巻数比１：ｎ２の変圧器
５を介して、入力端と出力端との間に直列接続してあ
る。変圧器５と並列に、フィルタ用コンデンサ８を接続
する。From the input terminal to which the external AC power supply 9 is connected, AC power is introduced via the switch 13.
The AC side of the second AC / DC converter 2 is connected in series between an input terminal and an output terminal via a transformer 5 having a turns ratio of 1: n2. A filter capacitor 8 is connected in parallel with the transformer 5.

【００５３】第１交直変換器１および第２交直変換器２
の直流側は、蓄電池３および直流コンデンサ６に並列接
続してある。First AC-DC converter 1 and second AC-DC converter 2
Is connected in parallel to the storage battery 3 and the DC capacitor 6.

【００５４】検出器１１１は、第１交直変換器１の交流
側電流Ｉinv1acを検出する。検出器１１２は、第２交直
変換器２の直流側電流を検出する。検出器１１４は、出
力電圧Ｖoutを検出する。検出器１１５は、直流電圧Ｖd
cを検出する。ローパスフィルタ１６１は、直流側電流
から高次の高調波成分をカットしたＩinv2dcを出力す
る。The detector 111 detects the AC side current Iinv1ac of the first AC / DC converter 1. Detector 112 detects the DC side current of second AC / DC converter 2. The detector 114 detects the output voltage Vout. The detector 115 detects the DC voltage Vd
Detect c. The low-pass filter 161 outputs Iinv2dc obtained by cutting high-order harmonic components from the DC current.

【００５５】指令値出力手段１２１は、直流電圧Ｖdcに
応じた充電電流の指令値Ｉbatt_refを出力する。The command value output means 121 outputs a command value Ibatt_ref of the charging current according to the DC voltage Vdc.

【００５６】正負極性判定手段１２３は、出力電圧Ｖou
tの正負極性を出力する。出力電圧Ｖoutが正のとき、１
を出力し、負のとき、−１を出力する。The positive / negative polarity determining means 123 outputs the output voltage Vou
Outputs the positive and negative polarity of t. When the output voltage Vout is positive, 1
Is output, and when negative, -1 is output.

【００５７】充電電流指令値Ｉbatt_refおよび直流側電
流Ｉinv2dcの和に、正負極性判定手段１２３の出力を掛
けると、第１交直変換器１の交流側電流指令値Ｉinv1ac
_refとなる。演算手段１２８は、出力電圧Ｖoutと直流
電圧Ｖdcとの比を求める。すなわち、変圧器４の巻数換
算のため、｜Ｖout｜／（n1・Ｖdc）を演算して出力す
る。制御手段１２４は、交流側電流Ｉinv1acに演算手段
１２８の出力を掛けた値が交流側電流指令値Ｉinvac_re
fを追従するように、第１交直変換器１を制御する。When the output of the positive / negative polarity determining means 123 is multiplied by the sum of the charging current command value Ibatt_ref and the DC current Iinv2dc, the AC current command value Iinv1ac of the first AC / DC converter 1 is obtained.
_ref. The calculating means 128 calculates a ratio between the output voltage Vout and the DC voltage Vdc. That is, for conversion of the number of turns of the transformer 4, | Vout | / (n1 · Vdc) is calculated and output. The control means 124 calculates the value obtained by multiplying the AC-side current Iinv1ac by the output of the calculating means 128 as the AC-side current command value Iinvac_re.
The first AC / DC converter 1 is controlled so as to follow f.

【００５８】基準値出力手段１２５は、出力電圧基準値
Ｖout_refを出力する。指令値出力手段１２６は、出力
電圧Ｖoutが出力電圧基準値Ｖout_refとなるように、第
２交直変換器２の交流側電圧指令値Ｖ2ac_refを出力す
る。制御手段１２７は、交流側電圧指令値Ｖ2ac_refに
基づいて、第２交直変換器２を制御する。The reference value output means 125 outputs an output voltage reference value Vout_ref. The command value output means 126 outputs the AC side voltage command value V2ac_ref of the second AC / DC converter 2 so that the output voltage Vout becomes the output voltage reference value Vout_ref. The control means 127 controls the second AC / DC converter 2 based on the AC-side voltage command value V2ac_ref.

【００５９】ここでは、無停電電源装置が、外部交流電
源９からの入力電圧Ｖinと第２交直変換器２の交流側電
圧との和を出力電圧Ｖoutとする場合の動作を説明し
た。Here, the operation in the case where the uninterruptible power supply sets the output voltage Vout as the sum of the input voltage Vin from the external AC power supply 9 and the AC side voltage of the second AC / DC converter 2 has been described.

【００６０】第２交直変換器２は、出力電圧Ｖoutを一
定にするため、入力電圧Ｖinが低いときは、昇圧し、入
力電圧Ｖinが高いときは、降圧する。The second AC / DC converter 2 boosts the voltage when the input voltage Vin is low and decreases the voltage when the input voltage Vin is high, in order to keep the output voltage Vout constant.

【００６１】外部交流電源９が停電した場合は、スイッ
チ１３が開き、第１交直変換器１が蓄電池３の電力を交
流に変換し、負荷１０に供給する。When the external AC power supply 9 is out of power, the switch 13 is opened, and the first AC / DC converter 1 converts the power of the storage battery 3 into AC and supplies it to the load 10.

【００６２】本実施例３において、直流側電流Ｉinv2dc
を検出すると、Ｖdc＝１とした場合の第２交直変換器２
の瞬時電力を検出したことになる。また、交流側電流Ｉ
inv1acに出力電圧Ｖoutと直流電圧Ｖdcとの比を掛け
て、第１交直変換器１の直流電圧Ｖdc＝１とした場合の
瞬時電力を推定する。この第１交直変換器１の推定瞬時
電力を交流側電圧指令値Ｉinv1ac_refに追従させるの
で、第１交直変換器１は、蓄電池３の瞬時充電電力と第
２交直変換器２の瞬時出力電力とを供給できる。In the third embodiment, the DC current Iinv2dc
Is detected, the second AC / DC converter 2 when Vdc = 1 is set
Is detected. Also, the AC side current I
Inv1ac is multiplied by the ratio between the output voltage Vout and the DC voltage Vdc to estimate the instantaneous power when the DC voltage Vdc of the first AC / DC converter 1 is set to 1. Since the estimated instantaneous power of the first AC / DC converter 1 follows the AC side voltage command value Iinv1ac_ref, the first AC / DC converter 1 calculates the instantaneous charging power of the storage battery 3 and the instantaneous output power of the second AC / DC converter 2. Can supply.

【００６３】ローパスフィルタ１６１は、高次の高調波
成分をカットするので、第１交直変換器１は、第２交直
変換器２が出力する低次の高調波成分のみを供給すれば
よいことになる。直流コンデンサ６には、高次の高調波
が流れるが、低次の高調波と比較して、リプル耐量を小
さくできる。Since the low-pass filter 161 cuts high-order harmonic components, the first AC / DC converter 1 only needs to supply the low-order harmonic components output from the second AC / DC converter 2. Become. Although high-order harmonics flow through the DC capacitor 6, the ripple resistance can be reduced as compared with low-order harmonics.

【００６４】また、入力電圧Ｖinと第２交直変換器２の
交流側電圧との和を出力し、入力電圧Ｖinの大小に応じ
て昇圧または降圧するので、負荷１０に安定した電圧を
供給できる。Further, since the sum of the input voltage Vin and the AC side voltage of the second AC / DC converter 2 is output and the voltage is increased or decreased according to the magnitude of the input voltage Vin, a stable voltage can be supplied to the load 10.

【００６５】《実施例４》図５は、本発明による無停電
電源装置の実施例４の系統構成を示すブロック図であ
る。第１交直変換器１の交流側は、巻数比１：ｎ１の変
圧器４を介して、出力端に並列接続してあり、フィルタ
用コンデンサ７も、出力端に並列接続してある。この出
力端には、負荷１０が接続される。Fourth Embodiment FIG. 5 is a block diagram showing a system configuration of a fourth embodiment of the uninterruptible power supply according to the present invention. The AC side of the first AC / DC converter 1 is connected in parallel to an output terminal via a transformer 4 having a turns ratio of 1: n1, and a filter capacitor 7 is also connected in parallel to the output terminal. The load 10 is connected to this output terminal.

【００６６】第１交直変換器１および第２交直変換器２
の直流側は、蓄電池３および直流コンデンサ６に並列に
接続してある。First AC-DC converter 1 and second AC-DC converter 2
Is connected to the storage battery 3 and the DC capacitor 6 in parallel.

【００６７】外部交流電源９が接続されている入力端か
らは、スイッチ１３を介して、交流電力が導入される。
第２交直変換器２の交流側は、巻数比１：ｎ２の変圧器
５を介して、入力端と出力端との間に直列接続してあ
る。変圧器５と並列に、フィルタ用コンデンサ８を接続
する。From the input terminal to which the external AC power supply 9 is connected, AC power is introduced via the switch 13.
The AC side of the second AC / DC converter 2 is connected in series between an input terminal and an output terminal via a transformer 5 having a turns ratio of 1: n2. A filter capacitor 8 is connected in parallel with the transformer 5.

【００６８】検出器１１１は、第１交直変換器１の交流
側電流Ｉinv1acを検出する。検出器１１４は、出力電圧
Ｖoutを検出する。検出器１１５は、直流電圧Ｖdcを検
出する。検出器１１７は、第２交直変換器２の交流側電
流Ｉinv2acを検出する。検出器１１８は、第２交直変換
器２の交流側電圧Ｖ2acを検出する。The detector 111 detects the AC side current Iinv1ac of the first AC / DC converter 1. The detector 114 detects the output voltage Vout. Detector 115 detects DC voltage Vdc. The detector 117 detects the AC-side current Iinv2ac of the second AC / DC converter 2. Detector 118 detects AC side voltage V2ac of second AC / DC converter 2.

【００６９】指令値出力手段１２１は、直流電圧Ｖdcに
応じた充電電流の指令値Ｉbatt_refを出力する。演算手
段１２９は、第２交直変換器２の交流側電圧Ｖ2acと直
流電圧Ｖdcとの比を求める。すなわち、Ｖ2ac／（n2・
Ｖdc）を演算して出力する。The command value output means 121 outputs a command value Ibatt_ref of the charging current according to the DC voltage Vdc. The calculating means 129 calculates the ratio between the AC side voltage V2ac of the second AC / DC converter 2 and the DC voltage Vdc. That is, V2ac / (n2 ·
Vdc) is calculated and output.

【００７０】交流側電流Ｉinv2acと演算手段１２９の出
力とを掛けると、等価的に第２交直変換器２の直流側電
流をローパスフィルタに通した値となる。When the AC-side current Iinv2ac is multiplied by the output of the calculating means 129, the DC-side current of the second AC / DC converter 2 is equivalent to a value obtained by passing through a low-pass filter.

【００７１】正負極性判定手段１２３は、出力電圧Ｖou
tの正負極性を出力する。出力電圧Ｖoutが正のとき、１
を出力し、負のとき、−１を出力する。The positive / negative polarity determining means 123 outputs the output voltage Vou
Outputs the positive and negative polarity of t. When the output voltage Vout is positive, 1
Is output, and when negative, -1 is output.

【００７２】交流側電流Ｉinv2acに演算手段１２９の出
力を掛けた値と充電電流指令値Ｉbatt_refとの和に、正
負極性判定手段１２３の出力を掛けると、第１交直変換
器１の交流側電流指令値Ｉinv1ac_refとなる。演算手段
１２８は、出力電圧Ｖoutと直流電圧Ｖdcとの比を求め
る。すなわち、変圧器７の巻数換算のため、｜Ｖout｜
／（n1・Ｖdc）を演算して出力する。制御手段１２４
は、交流側電流Ｉｉｎｖ１ａｃに演算手段１２８の出力
を掛けた値が交流側電流指令値Ｉｉｎｖａｃ＿ｒｅｆを
追従するように、第１交直変換器１を制御する。When the output of the positive / negative polarity determining means 123 is multiplied by the sum of the value obtained by multiplying the AC side current Iinv2ac by the output of the calculating means 129 and the charging current command value Ibatt_ref, the AC side current command of the first AC / DC converter 1 is obtained. The value becomes Iinv1ac_ref. The calculating means 128 calculates a ratio between the output voltage Vout and the DC voltage Vdc. That is, to convert the number of turns of the transformer 7, | Vout |
/ (N1 · Vdc) is calculated and output. Control means 124
Controls the first AC / DC converter 1 such that a value obtained by multiplying the AC-side current Iinv1ac by the output of the calculating means 128 follows the AC-side current command value Iinvac_ref.

【００７３】基準値出力手段１２５は、出力電圧基準値
Ｖout_refを出力する。指令値出力手段１２６は、出力
電圧Ｖoutが出力電圧基準値Ｖout_refとなるように、第
２交直変換器２の交流側電圧指令値Ｖ2ac_refを出力す
る。制御手段１２７は、交流側電圧指令値Ｖ2ac_refに
基づき、第２交直変換器２を制御する。The reference value output means 125 outputs an output voltage reference value Vout_ref. The command value output means 126 outputs the AC side voltage command value V2ac_ref of the second AC / DC converter 2 so that the output voltage Vout becomes the output voltage reference value Vout_ref. The control means 127 controls the second AC / DC converter 2 based on the AC-side voltage command value V2ac_ref.

【００７４】ここでは、無停電電源装置が、外部交流電
源９からの入力電圧Ｖinと第２交直変換器２の交流側電
圧の和を出力電圧Ｖoutとする場合の動作を説明した。Here, the operation in the case where the uninterruptible power supply sets the output voltage Vout as the sum of the input voltage Vin from the external AC power supply 9 and the AC side voltage of the second AC / DC converter 2 has been described.

【００７５】第２交直変換器２は、出力電圧Ｖoutを一
定にするため、入力電圧Ｖinが低いときは、昇圧し、入
力電圧Ｖinが高いときは、降圧する。The second AC / DC converter 2 boosts the voltage when the input voltage Vin is low and decreases the voltage when the input voltage Vin is high, in order to keep the output voltage Vout constant.

【００７６】外部交流電源９が停電した場合は、スイッ
チ１３を開き、第１交直変換器１が蓄電池３の電力を交
流に変換し、負荷１０に供給する。When the external AC power supply 9 is out of power, the switch 13 is opened, and the first AC / DC converter 1 converts the power of the storage battery 3 into AC and supplies it to the load 10.

【００７７】本実施例４は、検出対象が第２交直変換器
２の直流側電流Ｉinv2dcであった実施例３とは、第２交
直変換器２の交流側電流Ｉinv2acを検出する点で異なる
が、実施例３と同様の効果が得られる。The fourth embodiment differs from the third embodiment in which the detection target is the DC side current Iinv2dc of the second AC / DC converter 2 in that the AC side current Iinv2ac of the second AC / DC converter 2 is detected. Thus, the same effect as in the third embodiment can be obtained.

【００７８】《実施例５》図６は、本発明による無停電
電源装置の実施例５の系統構成を示すブロック図であ
る。第１交直変換器１の交流側は、巻数比１：ｎ１の変
圧器４を介して、出力端に並列接続してあり、フィルタ
用コンデンサ７も、出力端に並列接続してある。この出
力端には、負荷１０が接続される。Embodiment 5 FIG. 6 is a block diagram showing a system configuration of an uninterruptible power supply according to Embodiment 5 of the present invention. The AC side of the first AC / DC converter 1 is connected in parallel to an output terminal via a transformer 4 having a turns ratio of 1: n1, and a filter capacitor 7 is also connected in parallel to the output terminal. The load 10 is connected to this output terminal.

【００７９】外部交流電源９が接続されている入力端か
らは、スイッチ１３を介して、交流電力が導入される。
第２交直変換器２の交流側は、巻数比１：ｎ２の変圧器
５を介して、入力端と出力端との間に直列接続してあ
る。変圧器５と並列に、フィルタ用コンデンサ８を接続
する。AC power is introduced from an input terminal to which the external AC power supply 9 is connected via a switch 13.
The AC side of the second AC / DC converter 2 is connected in series between an input terminal and an output terminal via a transformer 5 having a turns ratio of 1: n2. A filter capacitor 8 is connected in parallel with the transformer 5.

【００８０】第１交直変換器１および第２交直変換器２
の直流側は、蓄電池３および直流コンデンサ６に並列接
続してある。First AC-DC converter 1 and second AC-DC converter 2
Is connected in parallel to the storage battery 3 and the DC capacitor 6.

【００８１】検出器１１１は、第１交直変換器１の交流
側電流Ｉinv1acを検出する。検出器１１４は、出力電圧
Ｖoutを検出する。検出器１１５は、直流電圧Ｖdcを検
出する。検出器１１７は、第２交直変換器２の交流側電
流Ｉinv2acを検出する。The detector 111 detects the AC side current Iinv1ac of the first AC / DC converter 1. The detector 114 detects the output voltage Vout. Detector 115 detects DC voltage Vdc. The detector 117 detects the AC-side current Iinv2ac of the second AC / DC converter 2.

【００８２】指令値出力手段１２１は、直流電圧Ｖdcに
応じた充電電流の指令値Ｉbatt_refを出力する。演算手
段１２９は、第２交直変換器２の交流側電圧と直流電圧
Ｖdcとの比を求める。ここでは、第２交直変換器２の交
流側電圧を検出せずに、指令値を用いて変圧器８の巻数
を換算し、Ｖ2ac_ref／（n2・Ｖdc）を演算して出力す
る。交流側電流Ｉinv2acに演算手段１２９の出力を掛け
ると、等価的に第２交直変換器２の直流側電流をローパ
スフィルタに通した値となる。The command value output means 121 outputs a command value Ibatt_ref of the charging current according to the DC voltage Vdc. The calculating means 129 obtains the ratio between the AC side voltage of the second AC / DC converter 2 and the DC voltage Vdc. Here, the number of turns of the transformer 8 is converted using the command value without detecting the AC side voltage of the second AC / DC converter 2, and V2ac_ref / (n2 · Vdc) is calculated and output. When the AC-side current Iinv2ac is multiplied by the output of the arithmetic unit 129, the AC-side current Iinv2ac is equivalent to a value obtained by passing the DC-side current of the second AC / DC converter 2 through a low-pass filter.

【００８３】正負極性判定手段１２３は、出力電圧Ｖou
tの正負極性を出力する。出力電圧Ｖoutが正のとき、１
を出力し、負のとき、−１を出力する。The positive / negative polarity determining means 123 outputs the output voltage Vou
Outputs the positive and negative polarity of t. When the output voltage Vout is positive, 1
Is output, and when negative, -1 is output.

【００８４】交流側電流Ｉinv2acに演算手段１２９の出
力を掛けた値と充電電流指令値Ｉbatt_refとの和に、正
負極性判定手段１２３の出力を掛けると、第１交直変換
器１の交流側電流指令値Ｉinv1ac_refになる。演算手段
１２８は、出力電圧Ｖoutと直流電圧Ｖdcとの比を求め
る。変圧器７の巻数を換算するため、｜Ｖout｜／（n1
・Ｖdc）を演算して出力する。制御手段１２４は、交流
側電流Ｉinv1acに演算手段１２８の出力を掛けた値が交
流側電流指令値Ｉinvac_refに追従するように、第１交
直変換器１を制御する。When the output of the positive / negative polarity determining means 123 is multiplied by the sum of the value obtained by multiplying the AC side current Iinv2ac by the output of the calculating means 129 and the charging current command value Ibatt_ref, the AC side current command of the first AC / DC converter 1 is obtained. The value becomes Iinv1ac_ref. The calculating means 128 calculates a ratio between the output voltage Vout and the DC voltage Vdc. In order to convert the number of turns of the transformer 7, | Vout | / (n1
・ Calculate and output Vdc). The control unit 124 controls the first AC / DC converter 1 such that a value obtained by multiplying the output of the arithmetic unit 128 by the AC-side current Iinv1ac follows the AC-side current command value Iinvac_ref.

【００８５】基準値出力手段１２５は、出力電圧基準値
Ｖout_refを出力する。指令値出力手段１２６は、出力
電圧Ｖoutが出力電圧基準値Ｖout_refとなるように、第
２交直変換器２の交流側電圧指令値Ｖ2ac_refを出力す
る。第２交直変換器制御手段１２７は、交流側電圧指令
値Ｖ2ac_refにより、第２交直変換器２を制御する。The reference value output means 125 outputs an output voltage reference value Vout_ref. The command value output means 126 outputs the AC side voltage command value V2ac_ref of the second AC / DC converter 2 so that the output voltage Vout becomes the output voltage reference value Vout_ref. The second AC / DC converter control means 127 controls the second AC / DC converter 2 based on the AC side voltage command value V2ac_ref.

【００８６】ここでは、無停電電源装置が、外部交流電
源９からの入力電圧Ｖinと第２交直変換器２の交流側電
圧との和を出力する場合の動作を説明した。The operation in the case where the uninterruptible power supply outputs the sum of the input voltage Vin from the external AC power supply 9 and the AC side voltage of the second AC / DC converter 2 has been described.

【００８７】出力電圧Ｖoutを一定にするため、第２交
直変換器２は、入力電圧Ｖinが低いときは、昇圧し、入
力電圧Ｖinが高いときは、降圧する。In order to keep the output voltage Vout constant, the second AC / DC converter 2 boosts the voltage when the input voltage Vin is low, and decreases the voltage when the input voltage Vin is high.

【００８８】外部交流電源９が停電した場合は、スイッ
チ１３を開き、第１交直変換器１が、蓄電池３の電力を
交流に変換し、負荷１０に供給する。When the external AC power supply 9 is out of power, the switch 13 is opened, and the first AC / DC converter 1 converts the power of the storage battery 3 into AC and supplies it to the load 10.

【００８９】本実施例５は、第２交直変換器２の交流側
電圧であった実施例３とは、第２交直変換器２の直流側
電圧を検出する点で異なるが、実施例３と同様の効果が
得られる。検出対象が第２交直変換器２の直流側電流Ｉ
inv2dcであった実施例３とは、第１交直変換器１の交流
側電流Ｉinv１acを検出する点で異なるが、実施例３と
同様の効果が得られる。The fifth embodiment is different from the third embodiment in which the AC side voltage of the second AC / DC converter 2 is detected, in that the DC side voltage of the second AC / DC converter 2 is detected. Similar effects can be obtained. The detection target is the DC side current I of the second AC / DC converter 2.
The third embodiment differs from the third embodiment in which inv2dc is used in that the AC-side current Iinv1ac of the first AC / DC converter 1 is detected, but the same effect as in the third embodiment is obtained.

【００９０】《第１交直変換器１の実施例１》図７は、
本発明の各実施例における第１交直変換器１および第１
交直変換器制御手段１２４の実施例１の回路構成を示す
図である。第１交直変換器１は、パワーＭＯＳＦＥＴ１
０１〜１０４を用いたフルブリッジ構成である。比例積
分演算器１２４１は、交流側電流指令値Ｉinv1ac_refと
交流側電流Ｉinv1acとの誤差を比例積分演算する。鋸歯
状波発生回路１２４２，１２４３は、それぞれ所定のキ
ャリア周波数を持ち、０〜１および−１〜０で変化する
波形を出力する。比較器１２４４は、（１２４１の出
力）≧（１２４２の出力）で１を出力し、（１２４１の
出力）＜（１２４２の出力）で０を出力する。比較器１
２４５は、（１２４１の出力）＜（１２４３の出力）で
１を出力し、（１２４１の出力）≧（１２４３の出力）
で０を出力する。ゲート駆動回路１２４６１〜１２４６
４は、それぞれ１０１〜１０４を駆動する。入力が正の
とき、パワーＭＯＳＦＥＴをＯＮさせ、入力が負のと
き、パワーＭＯＳＦＥＴをＯＦＦさせる。<< First Embodiment of First AC / DC Converter 1 >> FIG.
The first AC / DC converter 1 and the first AC / DC converter 1 in each embodiment of the present invention.
FIG. 4 is a diagram illustrating a circuit configuration of an AC / DC converter control unit according to a first embodiment. The first AC / DC converter 1 includes a power MOSFET 1
This is a full bridge configuration using 01 to 104. The proportional-integral calculator 1241 performs a proportional-integral operation on an error between the AC-side current command value Iinv1ac_ref and the AC-side current Iinv1ac. The sawtooth wave generating circuits 1242 and 1243 each have a predetermined carrier frequency and output a waveform that changes between 0 and 1 and -1 to 0. The comparator 1244 outputs 1 when (output of 1241) ≧ (output of 1242) and outputs 0 when (output of 1241) <(output of 1242). Comparator 1
245 outputs 1 when (output of 1241) <(output of 1243), and (output of 1241) ≧ (output of 1243)
Outputs 0. Gate drive circuits 12461 to 1246
4 drives 101 to 104, respectively. When the input is positive, the power MOSFET is turned on, and when the input is negative, the power MOSFET is turned off.

【００９１】《第１交直変換器１の実施例２》図８は、
本発明の各実施例における第１交直変換器１および第１
交直変換器制御手段１２４の実施例２の回路構成を示す
図である。第１交直変換器１は、パワーＭＯＳＦＥＴ１
０１〜１０４を用いたフルブリッジ構成である。比較器
１２４７は、ヒステリシス付きの比較器である。すなわ
ち、交流側電流指令値Ｉin1vac_refと交流側電流Ｉinv1
acとの大小関係の変化で、１，０を出力する。極性判定
回路１２４８は、出力電圧Ｖoutの極性を判定する。出
力電圧Ｖoutが正のとき、１を出力し、負のとき、０を
出力する。ゲート駆動回路１２４６１〜１２４６４は、
それぞれパワーＭＯＳＦＥＴ１０１〜１０４を駆動す
る。入力が正のとき、パワーＭＯＳＦＥＴをＯＮさせ、
入力が負のとき、パワーＭＯＳＦＥＴをＯＦＦさせる。<< Embodiment 2 of First AC / DC Converter 1 >> FIG.
The first AC / DC converter 1 and the first AC / DC converter 1 in each embodiment of the present invention.
FIG. 9 is a diagram illustrating a circuit configuration of an AC / DC converter control unit according to a second embodiment. The first AC / DC converter 1 includes a power MOSFET 1
This is a full bridge configuration using 01 to 104. The comparator 1247 is a comparator with hysteresis. That is, the AC side current command value Iin1vac_ref and the AC side current Iinv1
1 and 0 are output according to the change in the magnitude relationship with ac. The polarity determination circuit 1248 determines the polarity of the output voltage Vout. When the output voltage Vout is positive, 1 is output, and when it is negative, 0 is output. The gate drive circuits 12461 to 12464 are:
The power MOSFETs 101 to 104 are driven, respectively. When the input is positive, turn on the power MOSFET,
When the input is negative, the power MOSFET is turned off.

【００９２】《第２交直変換器２の実施例》図９は、本
発明の各実施例における第２交直変換器２の回路構成と
制御回路の具体例を示す図である。第２交直変換器２
は、パワーＭＯＳＦＥＴ２０１〜２０４を用いたフルブ
リッジ構成である。鋸歯状波発生回路１２７１，１２７
２は、それぞれ所定のキャリア周波数で０〜１および−
１〜０で変化する波形を出力する。比較器１２７３は、
交流側電圧指令値Ｖ2ac_ref≧（１２７１の出力）で１
を出力し、交流側電圧指令値Ｖ2ac_ref＜（１２７１の
出力）で０を出力する。比較器１２７４は、交流側電圧
指令値Ｖ2ac_ref＜（１２７２の出力）で１を出力し、
交流側電圧指令値Ｖ2ac_ref≧（１２７２の出力）で０
を出力する。ゲート駆動回路１２７５１〜１２７５４
は、それぞれパワーＭＯＳＦＥＴ２０１〜２０４を駆動
する。入力が正のとき、パワーＭＯＳＦＥＴをＯＮさ
せ、入力が負のとき、パワーＭＯＳＦＥＴをＯＦＦさせ
る。<< Embodiment of Second AC / DC Converter 2 >> FIG. 9 is a diagram showing a circuit configuration of the second AC / DC converter 2 and a specific example of a control circuit in each embodiment of the present invention. Second AC-DC converter 2
Is a full bridge configuration using power MOSFETs 201 to 204. Sawtooth wave generating circuits 1271 and 127
2 are predetermined carrier frequencies of 0 to 1 and-
A waveform that changes between 1 and 0 is output. The comparator 1273 is
1 if AC voltage command value V2ac_ref ≧ (output of 1271)
And outputs 0 when the AC-side voltage command value V2ac_ref <(output of 1271). The comparator 1274 outputs 1 with the AC-side voltage command value V2ac_ref <(output of 1272),
0 if the AC side voltage command value V2ac_ref ≧ (output of 1272)
Is output. Gate drive circuits 12751 to 12754
Drive the power MOSFETs 201 to 204, respectively. When the input is positive, the power MOSFET is turned on, and when the input is negative, the power MOSFET is turned off.

【００９３】[0093]

【発明の効果】本発明によれば、第１交直変換器および
第２交直変換器の瞬時電力をそれぞれ検出しまたは推定
する手段と、外部交流電源からの入力電圧と第２交直変
換器の交流側電圧との和が所定の出力電圧になるように
第２交直変換器を制御する手段と、第２交直変換器が出
力する瞬時電力と蓄電池への瞬時充電電力とを供給する
ように第１交直変換器を制御する手段とを備えたので、
直流部分に蓄電池放電防止用リアクトルを接続したり、
直流コンデンサのリプル耐量を上げたりせずに、第１交
直変換器と第２交直変換器との間で電力を授受して、負
荷に所定の電圧を供給するとともに、蓄電池を安定に充
電でき、しかも、蓄電池放電防止用リアクトルが不要と
なりコンデンサを小型化した分だけ、装置全体を小型化
しコストダウンできる無停電電源装置が得られる。According to the present invention, the means for detecting or estimating the instantaneous power of the first AC / DC converter and the second AC / DC converter respectively, and the input voltage from the external AC power supply and the AC of the second AC / DC converter. Means for controlling the second AC / DC converter so that the sum of the side voltage and the predetermined voltage becomes a predetermined output voltage; and first means for supplying instantaneous power output from the second AC / DC converter and instantaneous charging power to the storage battery. And means for controlling the AC / DC converter.
Connect a storage battery discharge prevention reactor to the DC part,
The power can be transferred between the first AC / DC converter and the second AC / DC converter to supply a predetermined voltage to the load and stably charge the storage battery without increasing the ripple resistance of the DC capacitor. In addition, the need for a storage battery discharge prevention reactor is eliminated, and an uninterruptible power supply device capable of reducing the size of the entire device and reducing costs by the size of the capacitor can be obtained.

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

【図１】本発明による無停電電源装置の実施例１の系統
構成を示すブロック図である。FIG. 1 is a block diagram illustrating a system configuration of an uninterruptible power supply according to a first embodiment of the present invention.

【図２】図１に示した無停電電源装置における電圧電流
波形を示す図である。FIG. 2 is a diagram showing voltage-current waveforms in the uninterruptible power supply shown in FIG.

【図３】本発明による無停電電源装置の実施例２の系統
構成を示すブロック図である。FIG. 3 is a block diagram showing a system configuration of an uninterruptible power supply according to a second embodiment of the present invention.

【図４】本発明による無停電電源装置の実施例３の系統
構成を示すブロック図である。FIG. 4 is a block diagram illustrating a system configuration of an uninterruptible power supply according to a third embodiment of the present invention.

【図５】本発明による無停電電源装置の実施例４の系統
構成を示すブロック図である。FIG. 5 is a block diagram showing a system configuration of an uninterruptible power supply according to a fourth embodiment of the present invention.

【図６】本発明による無停電電源装置の実施例５の系統
構成を示すブロック図である。FIG. 6 is a block diagram showing a system configuration of a fifth embodiment of the uninterruptible power supply according to the present invention.

【図７】本発明の各実施例における第１交直変換器およ
び第１交直変換器制御手段の実施例１の回路構成を示す
図である。FIG. 7 is a diagram illustrating a circuit configuration of a first AC / DC converter and a first AC / DC converter control unit according to the first embodiment of the present invention.

【図８】本発明の各実施例における第１交直変換器およ
び第１交直変換器制御手段の実施例２の回路構成を示す
図である。FIG. 8 is a diagram showing a circuit configuration of a first AC / DC converter and first AC / DC converter control means according to a second embodiment of the present invention.

【図９】本発明の各実施例における第２交直変換器およ
び第２交直変換器制御手段の実施例の回路構成を示す図
である。FIG. 9 is a diagram showing a circuit configuration of an embodiment of a second AC / DC converter and a second AC / DC converter control means in each embodiment of the present invention.

【図１０】従来の無停電電源装置の一例の系統構成を示
すブロック図である。FIG. 10 is a block diagram showing a system configuration of an example of a conventional uninterruptible power supply.

【図１１】図１０に示した従来の無停電電源装置におけ
る電圧電流波形を示す図である。11 is a diagram showing voltage and current waveforms in the conventional uninterruptible power supply shown in FIG.

【符号の説明】[Explanation of symbols]

１ 第１交直変換器 ２ 第２交直変換器 ３ 蓄電池 ４ 変圧器 ５ 変圧器 ６ 直流コンデンサ ７ フィルタ用コンデンサ ８ フィルタ用コンデンサ ９ 交流電源 １０ 負荷 １２ 制御回路 １３ スイッチ １４ フィルタ用リアクトル １５ 蓄電池放電防止用リアクトル １０１〜１０４ パワーＭＯＳＦＥＴ １１０〜１１９ 電流および電圧検出器 １２１ 蓄電池充電電流指令値出力手段 １２２ 演算増幅器 １２３ 正負極性判定手段 １２４ 第１交直変換器制御手段 １２４１ 比例積分演算器 １２４２ 鋸歯状波発生器 １２４３ 鋸歯状波発生器 １２４４ 比較器 １２４５ 比較器 １２４６１〜１２４６４ ゲート駆動回路 １２４７ ヒステリシス付き比較器 １２４８ 入力正負極性判定手段 １２５ 出力電圧基準値出力手段 １２６ 交流側電圧指令値制御手段 １２７ 第２交直変換器制御手段 １２７１ 鋸歯状波発生器 １２７２ 鋸歯状波発生器 １２７３ 比較器 １２７４ 比較器 １２７５１〜１２７５４ ゲート駆動回路 １２８ 除算器 １２９ 除算器 １６１ ローパスフィルタ １６２ ローパスフィルタ ２０１〜２０４ パワーＭＯＳＦＥＴ DESCRIPTION OF SYMBOLS 1 1st AC / DC converter 2 2nd AC / DC converter 3 Storage battery 4 Transformer 5 Transformer 6 DC capacitor 7 Filter capacitor 8 Filter capacitor 9 AC power supply 10 Load 12 Control circuit 13 Switch 14 Filter reactor 15 Prevention of storage battery discharge Reactors 101 to 104 Power MOSFETs 110 to 119 Current and voltage detectors 121 Battery charging current command value output means 122 Operational amplifier 123 Positive / negative polarity determination means 124 First AC / DC converter control means 1241 Proportional integration calculator 1242 Sawtooth wave generator 1243 Sawtooth generator 1244 Comparator 1245 Comparator 12461 to 12644 Gate drive circuit 1247 Comparator with hysteresis 1248 Input positive / negative polarity determination means 125 Output voltage reference value output means 126 AC side voltage command value control means 1 7 second AC-DC converter control means 1271 sawtooth generator 1272 sawtooth generator 1273 comparator 1274 comparator 12751-12754 gate drive circuit 128 divider 129 divider 161 low-pass filter 162 low-pass filters 201 to 204 power MOSFET

───────────────────────────────────────────────────── フロントページの続き (72)発明者 梅津 秀恭 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 (72)発明者 叶田 玲彦 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 Ｆターム(参考） 5G015 FA08 GA06 HA04 HA15 JA02 JA13 JA23 JA24 JA26 JA32 JA34 JA35 JA53 JA55  ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hideyasu Umezu 3-1-1, Sachimachi, Hitachi-City, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Reihiko Kanoda Three-Year Sachimachi, Hitachi-City, Ibaraki 1-chome F-term (reference) in Hitachi, Ltd. Hitachi Plant 5G015 FA08 GA06 HA04 HA15 JA02 JA13 JA23 JA24 JA26 JA32 JA34 JA35 JA53 JA55

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 入力端に接続した外部交流電源から交流
電力を導入し、第１交直変換器の交流側を出力端に並列
接続し、第２交直変換器の交流側を前記入力端と前記出
力端との間に直列接続し、前記第１交直変換器および前
記第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は前記出力端に接続
された負荷に交流電力を供給するとともに前記直流電力
貯蔵手段を充電しておき、前記外部交流電源の停電時に
前記第１交直変換器が前記直流電力貯蔵手段の直流電力
を交流電力に変換し前記負荷に供給する無停電電源装置
において、 前記第１交直変換器および前記第２交直変換器の瞬時電
力をそれぞれ検出しまたは推定する手段と、 前記外部交流電源からの入力電圧と前記第２交直変換器
の交流側電圧との和が所定の出力電圧になるように前記
第２交直変換器を制御する手段と、 前記第２交直変換器が出力する瞬時電力と前記直流電力
貯蔵手段への瞬時充電電力とを供給するように前記第１
交直変換器を制御する手段とを備えたことを特徴とする
無停電電源装置。An AC power is introduced from an external AC power supply connected to an input terminal, an AC side of a first AC / DC converter is connected in parallel to an output terminal, and an AC side of a second AC / DC converter is connected to the input terminal and the AC terminal. A DC power storage means and a DC capacitor connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and a load connected to the output end in a normal state; And the DC power storage means is charged and the first AC / DC converter converts the DC power of the DC power storage means into AC power and supplies it to the load when the external AC power source fails. Means for detecting or estimating the instantaneous power of the first AC / DC converter and the second AC / DC converter, respectively; and an input voltage from the external AC power supply and an AC of the second AC / DC converter. With side voltage Means for controlling the second AC / DC converter so that a predetermined output voltage is obtained, and the instantaneous power output by the second AC / DC converter and the instantaneous charging power to the DC power storage means are supplied. First
Means for controlling the AC / DC converter. 【請求項２】 入力端に接続した外部交流電源から交流
電力を導入し、第１交直変換器の交流側を出力端に並列
接続し、第２交直変換器の交流側を前記入力端と前記出
力端との間に直列接続し、前記第１交直変換器および前
記第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は前記出力端に接続
された負荷に交流電力を供給するとともに前記直流電力
貯蔵手段を充電しておき、前記外部交流電源の停電時に
前記第１交直変換器が前記直流電力貯蔵手段の直流電力
を交流電力に変換し前記負荷に供給する無停電電源装置
において、 前記第１交直変換器の交流側電流を検出する手段と、前
記第２交直変換器の直流側電流を検出する手段と、前記
直流電力貯蔵手段の充電電流および直流電圧を検出する
手段と、前記無停電電源装置の出力電圧を検出する手段
と、前記第２交直変換器の直流側電流検出値の高次の高
調波成分を除去する手段とを備え、 前記外部交流電源からの入力電圧と前記第２交直変換器
の交流側電圧との和が所定の出力電圧になるように前記
第２交直変換器を制御する手段と、 前記直流電圧の検出値に応じた前記充電電流の指令値を
算出し、前記充電電流の指令値と前記充電電流の検出値
との誤差成分と前記第２交直変換器の直流側電流検出値
の高次の高調波を除去した値との和を前記出力電圧の検
出値が正か負かにより正負を反転させ、前記第１交直変
換器の交流側電流の指令値とし、前記第１交直変換器の
交流側電流の検出値を指令値に追従させる手段とを備え
たことを特徴とする無停電電源装置。2. An AC power is introduced from an external AC power supply connected to an input terminal, an AC side of a first AC / DC converter is connected in parallel to an output terminal, and an AC side of a second AC / DC converter is connected to the input terminal and the AC terminal. A DC power storage means and a DC capacitor connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and a load connected to the output end in a normal state; And the DC power storage means is charged and the first AC / DC converter converts the DC power of the DC power storage means into AC power and supplies it to the load when the external AC power source fails. An uninterruptible power supply device comprising: a unit for detecting an AC side current of the first AC / DC converter; a unit for detecting a DC side current of the second AC / DC converter; and a charging current and a DC voltage of the DC power storage unit. Means for detecting Means for detecting an output voltage of the uninterruptible power supply, and means for removing higher-order harmonic components of a DC-side current detection value of the second AC / DC converter, and an input voltage from the external AC power supply. Means for controlling the second AC / DC converter so that the sum of the AC voltage of the second AC / DC converter and the AC side voltage becomes a predetermined output voltage; and a command value of the charging current according to the detected value of the DC voltage. Calculating the sum of an error component between the command value of the charging current and the detection value of the charging current and a value obtained by removing a higher-order harmonic of a DC-side current detection value of the second AC / DC converter. Means for inverting the positive or negative depending on whether the detected value is positive or negative, as a command value of the AC side current of the first AC / DC converter, and causing the detected value of the AC side current of the first AC / DC converter to follow the command value; An uninterruptible power supply comprising: 【請求項３】 入力端に接続した外部交流電源から交流
電力を導入し、第１交直変換器の交流側を出力端に並列
接続し、第２交直変換器の交流側を前記入力端と前記出
力端との間に直列接続し、前記第１交直変換器および前
記第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は前記出力端に接続
された負荷に交流電力を供給するとともに前記直流電力
貯蔵手段を充電しておき、前記外部交流電源の停電時に
前記第１交直変換器が前記直流電力貯蔵手段の直流電力
を交流電力に変換し前記負荷に供給する無停電電源装置
において、 前記第１交直変換器の直流側電流および交流側電流を検
出する手段と、前記第２交直変換器の直流側電流を検出
する手段と、前記直流電力貯蔵手段の直流電圧を検出す
る手段と、前記無停電電源装置の出力電圧を検出する手
段と、前記第１交直変換器の直流側電流検出値および前
記第２交直変換器の直流側電流検出値の高次の高調波成
分をそれぞれ除去する手段とを備え、 前記外部交流電源からの入力電圧と前記第２交直変換器
の交流側電圧との和が所定の出力電圧となるように前記
第２交直変換器を制御する手段と、 前記直流電圧の検出値に応じた前記充電電流の指令値を
算出し、前記充電電流の指令値および前記第２交直変換
器の直流側電流検出値の高次の高調波を除去した値の和
と前記第１交直変換器の直流側電流の検出値の高次の高
調波を除去した値との差の成分を前記出力電圧の検出値
が正か負かにより正負を反転させ、前記第１交直変換器
の交流側電流の指令値とし、前記第１交直変換器の交流
側電流の検出値を指令値に追従させる手段とを備えたこ
とを特徴とする無停電電源装置。3. An AC power is introduced from an external AC power supply connected to an input terminal, an AC side of a first AC / DC converter is connected in parallel to an output terminal, and an AC side of a second AC / DC converter is connected to the input terminal and the AC terminal. A DC power storage means and a DC capacitor connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and a load connected to the output end in a normal state; And the DC power storage means is charged and the first AC / DC converter converts the DC power of the DC power storage means into AC power and supplies it to the load when the external AC power source fails. An uninterruptible power supply device comprising: means for detecting a DC side current and an AC side current of the first AC / DC converter; means for detecting a DC side current of the second AC / DC converter; Means for detecting voltage Means for detecting the output voltage of the uninterruptible power supply, and removing higher-order harmonic components of the DC-side current detection value of the first AC / DC converter and the DC-side current detection value of the second AC / DC converter, respectively. Means for controlling the second AC / DC converter so that the sum of the input voltage from the external AC power supply and the AC side voltage of the second AC / DC converter becomes a predetermined output voltage; A command value of the charging current according to the detection value of the DC voltage is calculated, and the sum of the command value of the charging current and a value obtained by removing higher-order harmonics of the DC side current detection value of the second AC / DC converter is calculated. A component of a difference between a detected value of the DC side current of the first AC / DC converter and a value obtained by removing higher-order harmonics is inverted between positive and negative depending on whether the detected value of the output voltage is positive or negative. A command value of the AC side current of the converter, and the AC side current of the first AC / DC converter Uninterruptible power supply being characterized in that a means to follow the detected value to the command value. 【請求項４】 入力端に接続した外部交流電源から交流
電力を導入し、第１交直変換器の交流側を出力端に並列
接続し、第２交直変換器の交流側を前記入力端と前記出
力端との間に直列接続し、前記第１交直変換器および前
記第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は前記出力端に接続
された負荷に交流電力を供給するとともに前記直流電力
貯蔵手段を充電しておき、前記外部交流電源の停電時に
前記第１交直変換器が前記直流電力貯蔵手段の直流電力
を交流電力に変換し前記負荷に供給する無停電電源装置
において、 前記第１交直変換器の交流側電流を検出する手段と、前
記第２交直変換器の直流側電流を検出する手段と、前記
直流電力貯蔵手段の直流電圧を検出する手段と、前記無
停電電源装置の出力電圧を検出する手段と、前記第２交
直変換器の直流側電流検出値の高次の高調波成分を除去
する手段とを備え、 前記外部交流電源からの入力電圧と前記第２交直変換器
の交流側電圧との和が所定の出力電圧となるように前記
第２交直変換器を制御する手段と、 前記直流電圧の検出値に応じた前記充電電流の指令値を
算出し、前記充電電流の指令値と前記第２交直変換器の
直流側電流の検出値の高次の高調波を除去した値との和
を前記出力電圧の検出値が正か負かにより正負を反転さ
せ、前記第１交直変換器の交流側電流の指令値とし、前
記第１交直変換器の交流側電流の検出値に前記出力電圧
の検出値と前記直流電圧の検出値との比を掛けた値を前
記第１交直変換器の交流側電流の指令値に追従させる手
段とを備えたことを特徴とする無停電電源装置。4. An AC power is introduced from an external AC power supply connected to an input terminal, an AC side of a first AC / DC converter is connected in parallel to an output terminal, and an AC side of a second AC / DC converter is connected to the input terminal and the AC terminal. A DC power storage means and a DC capacitor connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and a load connected to the output end in a normal state; And the DC power storage means is charged and the first AC / DC converter converts the DC power of the DC power storage means into AC power and supplies it to the load when the external AC power source fails. In the uninterruptible power supply device, means for detecting the AC side current of the first AC / DC converter, means for detecting the DC side current of the second AC / DC converter, and detecting the DC voltage of the DC power storage means Means and the uninterruptible power Means for detecting the output voltage of the device, and means for removing higher-order harmonic components of the DC-side current detection value of the second AC / DC converter; and an input voltage from the external AC power supply and the second AC / DC converter. Means for controlling the second AC / DC converter so that the sum of the AC voltage of the converter and the AC side voltage becomes a predetermined output voltage; and calculating a command value of the charging current according to a detection value of the DC voltage, Inverting the sum of the command value of the charging current and the value obtained by removing higher-order harmonics of the detection value of the DC side current of the second AC / DC converter, depending on whether the detection value of the output voltage is positive or negative, A command value of the AC side current of the first AC / DC converter, and a value obtained by multiplying a detection value of the AC side current of the first AC / DC converter by a ratio between the detection value of the output voltage and the detection value of the DC voltage. Means for following the command value of the AC side current of the first AC / DC converter. Uninterruptible power supply. 【請求項５】 入力端に接続した外部交流電源から交流
電力を導入し、第１交直変換器の交流側を出力端に並列
接続し、第２交直変換器の交流側を前記入力端と前記出
力端との間に直列接続し、前記第１交直変換器および前
記第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は前記出力端に接続
された負荷に交流電力を供給するとともに前記直流電力
貯蔵手段を充電しておき、前記外部交流電源の停電時に
前記第１交直変換器が前記直流電力貯蔵手段の直流電力
を交流電力に変換し前記負荷に供給する無停電電源装置
において、 前記第１交直変換器の交流側電流を検出する手段と、前
記第２交直変換器の交流側電流および電圧を検出する手
段と、前記直流電力貯蔵手段の直流電圧を検出する手段
と、前記無停電電源装置の出力電圧を検出する手段とを
備え、 前記外部交流電源からの入力電圧と前記第２交直変換器
の交流側電圧との和が所定の出力電圧となるように前記
第２交直変換器を制御する手段と、 前記直流電圧の検出値に応じた前記充電電流の指令値を
算出し、前記第２交直変換器の交流側電流の検出値に前
記第２交直変換器の交流側電圧の検出値と前記直流電圧
の検出値との比を掛けて前記第２交直変換器の直流側電
流の検出値とし、前記充電電流の指令値と前記第２交直
変換器の直流側電流の検出値との和を前記出力電圧の検
出値が正か負かにより正負を反転させ、前記第１交直変
換器の交流側電流の指令値とし、前記第１交直変換器の
交流側電流の検出値に前記出力電圧の検出値と前記直流
電圧の検出値との比を掛けた値を前記第１交直変換器の
交流側電流の指令値に追従させる手段とを備えたことを
特徴とする無停電電源装置。5. An AC power is introduced from an external AC power supply connected to an input terminal, an AC side of a first AC / DC converter is connected in parallel to an output terminal, and an AC side of a second AC / DC converter is connected to the input terminal and the AC terminal. A DC power storage means and a DC capacitor connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and a load connected to the output end in a normal state; And the DC power storage means is charged and the first AC / DC converter converts the DC power of the DC power storage means into AC power and supplies it to the load when the external AC power source fails. In the uninterruptible power supply device, means for detecting an AC side current of the first AC / DC converter, means for detecting an AC side current and voltage of the second AC / DC converter, and a DC voltage of the DC power storage means Means to detect and before Means for detecting an output voltage of the uninterruptible power supply, wherein the second AC / DC converter is configured such that a sum of an input voltage from the external AC power supply and an AC side voltage of the second AC / DC converter becomes a predetermined output voltage. Means for controlling a converter; calculating a command value of the charging current in accordance with the detected value of the DC voltage, and converting the detected value of the AC side current of the second AC / DC converter into the AC side of the second AC / DC converter; The ratio between the detected value of the voltage and the detected value of the DC voltage is multiplied to obtain the detected value of the DC side current of the second AC / DC converter, and the command value of the charging current and the DC side current of the second AC / DC converter are calculated. The sum of the detected value and the output voltage is inverted between positive and negative depending on whether the detected value of the output voltage is positive or negative, and is used as a command value of the AC side current of the first AC / DC converter. The value multiplied by the ratio between the detected value of the output voltage and the detected value of the DC voltage is the value Uninterruptible power supply being characterized in that a means to follow the command value of the AC side current of 1 AC-DC converter. 【請求項６】 入力端に接続した外部交流電源から交流
電力を導入し、第１交直変換器の交流側を出力端に並列
接続し、第２交直変換器の交流側を前記入力端と前記出
力端との間に直列接続し、前記第１交直変換器および前
記第２交直変換器の直流側に直流電力貯蔵手段および直
流コンデンサを並列接続し、通常時は前記出力端に接続
された負荷に交流電力を供給するとともに前記直流電力
貯蔵手段を充電しておき、前記外部交流電源の停電時に
前記第１交直変換器が前記直流電力貯蔵手段の直流電力
を交流電力に変換し前記負荷に供給する無停電電源装置
において、 前記第１交直変換器の交流側電流を検出する手段と、前
記第２交直変換器の交流側電流を検出する手段と、前記
直流電力貯蔵手段の直流電圧を検出する手段と、前記無
停電電源装置の出力電圧を検出する手段とを備え、 前記外部交流電源からの入力電圧と前記第２交直変換器
の交流側電圧との和が所定の出力電圧となるように前記
第２交直変換器を制御する手段と、 前記直流電圧の検出値に応じた前記充電電流の指令値を
算出し、前記第２交直変換器の交流側電流の検出値に前
記第２交直変換器の交流側電圧の指令値と前記直流電圧
の検出値との比を掛けて前記第２交直変換器の直流側電
流の検出値とし、前記充電電流の指令値と前記第２交直
変換器の直流側電流の検出値との和を前記出力電圧の検
出値が正か負かにより正負を反転させ、前記第１交直変
換器の交流側電流の指令値とし、前記第１交直変換器の
交流側電流の検出値に前記出力電圧の検出値と前記直流
電圧の検出値との比を掛けた値を前記第１交直変換器の
交流側電流の指令値に追従させる手段とを備えたことを
特徴とする無停電電源装置。6. An AC power is introduced from an external AC power supply connected to an input terminal, an AC side of a first AC / DC converter is connected in parallel to an output terminal, and an AC side of a second AC / DC converter is connected to the input terminal and the input terminal. A DC power storage means and a DC capacitor connected in parallel to the DC side of the first AC / DC converter and the second AC / DC converter, and a load connected to the output end in a normal state; And the DC power storage means is charged and the first AC / DC converter converts the DC power of the DC power storage means into AC power and supplies it to the load when the external AC power source fails. In the uninterruptible power supply device, means for detecting an AC side current of the first AC / DC converter, means for detecting an AC side current of the second AC / DC converter, and detecting a DC voltage of the DC power storage means Means and the uninterruptible power Means for detecting an output voltage of the device, wherein the second AC / DC converter is configured such that a sum of an input voltage from the external AC power supply and an AC side voltage of the second AC / DC converter is a predetermined output voltage. Means for controlling; calculating a command value of the charging current according to the detected value of the DC voltage, and instructing the detected value of the AC side current of the second AC / DC converter to the command of the AC side voltage of the second AC / DC converter. Multiplied by the ratio of the detected value of the DC voltage to the detected value of the DC side current of the second AC / DC converter, and the command value of the charging current and the detected value of the DC side current of the second AC / DC converter. Is inverted depending on whether the detected value of the output voltage is positive or negative, and is used as the command value of the AC side current of the first AC / DC converter. The value obtained by multiplying the ratio between the detected value of the output voltage and the detected value of the DC voltage is the first AC / DC change. Uninterruptible power supply being characterized in that a means to follow the command value of the AC side current of the vessel.
JP19416499A 1999-07-08 1999-07-08 Uninterruptible power system Expired - Fee Related JP3632120B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19416499A JP3632120B2 (en) 1999-07-08 1999-07-08 Uninterruptible power system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19416499A JP3632120B2 (en) 1999-07-08 1999-07-08 Uninterruptible power system

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JP2001025178A true JP2001025178A (en) 2001-01-26
JP3632120B2 JP3632120B2 (en) 2005-03-23

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ID=16320003

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009261052A (en) * 2008-04-14 2009-11-05 Meidensha Corp Momentary drop compensator
JP2019122163A (en) * 2018-01-09 2019-07-22 オムロン株式会社 Power storage controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009261052A (en) * 2008-04-14 2009-11-05 Meidensha Corp Momentary drop compensator
JP2019122163A (en) * 2018-01-09 2019-07-22 オムロン株式会社 Power storage controller

Also Published As

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