JPH07154975A - Uninterruptible power supply apparatus - Google Patents
Uninterruptible power supply apparatusInfo
- Publication number
- JPH07154975A JPH07154975A JP5297727A JP29772793A JPH07154975A JP H07154975 A JPH07154975 A JP H07154975A JP 5297727 A JP5297727 A JP 5297727A JP 29772793 A JP29772793 A JP 29772793A JP H07154975 A JPH07154975 A JP H07154975A
- Authority
- JP
- Japan
- Prior art keywords
- inverter
- output
- waveform
- control circuit
- signal
- 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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- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、無停電電源装置におけ
るインバータ装置の出力電圧波形制御に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to output voltage waveform control of an inverter device in an uninterruptible power supply.
【０００２】[0002]
【従来の技術】無停電電源装置におけるインバータ装置
の出力電圧波形を制御するには、インバータの制御回路
内で形成した基準正弦波電圧に基づく波形指令信号とイ
ンバータ出力電圧との誤差を両者を直接波形比較して検
出し、この誤差信号に基づき高周波の搬送波をパルス幅
変調制御（ＰＷＭ制御）することにより高速な波形制御
を行って、インバータ出力電圧の波形を負荷電流の波形
が線形・非線形にかかわらず、きれいな正弦波になるよ
うにしていた。2. Description of the Related Art In order to control an output voltage waveform of an inverter device in an uninterruptible power supply device, an error between a waveform command signal based on a reference sine wave voltage formed in a control circuit of the inverter and an inverter output voltage is directly measured. High-speed waveform control is performed by performing pulse width modulation control (PWM control) on the high-frequency carrier wave based on detection by comparing waveforms based on this error signal, making the waveform of the inverter output voltage linear or non-linear with the waveform of the load current. Regardless, I was trying to get a clean sine wave.
【０００３】図４は上記のような出力波形制御を行う従
来の無停電電源装置の例を示したもので、商用電源１の
電力を整流器２で整流して蓄電池３を充電し、蓄電池３
の直流電力をインバータ４で交流電力に変換して切換ス
イッチ５を介して負荷６へ給電する。１７はインバータ
制御回路で、この制御回路は、インバータ出力電圧Ｖ0
をトランス８で降圧した帰還電圧信号Ｖ01を平均値化回
路９に入力して得た電圧平均値と、電圧設定器１０から
の電圧指令値とを電圧制御回路１１に入力して誤差信号
を得る。そして、この誤差信号と、基準正弦波発生回路
１２からの基準正弦波信号（商用電源電圧に同期する）
とを乗算して波形指令信号Ｖ1 を得、この信号Ｖ1 と前
述の帰還電圧信号Ｖ01とを波形制御回路１４に入力して
誤差信号Ｖ2 を得るとともに、該信号Ｖ2 を直流分検出
回路１８に入力して得た直流分補正信号Ｖi を波形制御
回路１４の入力に帰還する。以上、一連の手段により得
られた誤差信号Ｖ2 をＰＷＭ制御回路１５に入力してＰ
ＷＭ制御信号を得、この制御信号によりドライブ回路１
６を介してインバータ４の開閉素子を制御することによ
り、インバータ出力電圧の波形制御を行っていた。FIG. 4 shows an example of a conventional uninterruptible power supply device which performs the above-mentioned output waveform control. The power of the commercial power supply 1 is rectified by the rectifier 2 to charge the storage battery 3 and the storage battery 3
The DC power is converted into AC power by the inverter 4 and is fed to the load 6 via the changeover switch 5. Reference numeral 17 designates an inverter control circuit, which controls the inverter output voltage V0.
The voltage average value obtained by inputting the feedback voltage signal V01, which has been stepped down by the transformer 8, to the averaging circuit 9 and the voltage command value from the voltage setter 10 are input to the voltage control circuit 11 to obtain an error signal. . Then, this error signal and the reference sine wave signal from the reference sine wave generation circuit 12 (synchronized with the commercial power supply voltage)
Is multiplied to obtain a waveform command signal V1, and this signal V1 and the above-mentioned feedback voltage signal V01 are inputted to the waveform control circuit 14 to obtain an error signal V2, and the signal V2 is inputted to the DC component detection circuit 18. The DC correction signal Vi thus obtained is fed back to the input of the waveform control circuit 14. The error signal V2 obtained by the series of means is input to the PWM control circuit 15 and P
The WM control signal is obtained, and the drive circuit 1 is generated by this control signal.
By controlling the switching element of the inverter 4 via 6, the waveform control of the inverter output voltage was performed.
【０００４】[0004]
【発明が解決しようとする課題】以上述べた従来のイン
バータ出力制御による無停電電源装置では、大半の対象
負荷となるコンピュータのように、負荷の入力形態がコ
ンデンサ・インプット形整流回路のもののような場合、
負荷電流はインバータ出力電圧の波形がきれいな正弦波
であっても電流のピーク値が高くなり、負荷力率（有効
電力／皮相電力）が低下して、負荷電流の実効値が大き
くなってしまうという問題があった。In the above-described conventional uninterruptible power supply system based on inverter output control, the input form of the load is the same as that of a capacitor input type rectifier circuit, as in most computers that are the target loads. If
Even if the load current is a sine wave with a clean waveform of the inverter output voltage, the peak value of the current increases, the load power factor (active power / apparent power) decreases, and the effective value of the load current increases. There was a problem.
【０００５】本発明の目的は、負荷がコンデンサ・イン
プット形整流回路のような非線形負荷の場合でも、負荷
電流のピーク値を下げ、負荷力率を向上させて、負荷電
流の実効値を低下させることのできる無停電電源装置を
提供することにある。An object of the present invention is to reduce the peak value of the load current, improve the load power factor, and reduce the effective value of the load current even when the load is a non-linear load such as a capacitor input type rectifier circuit. It is to provide an uninterruptible power supply device capable of doing so.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明の対象とする無停電電源装置は、図１の実
施例に見られるように、商用電源電力を整流した直流出
力により充電される蓄電池３と、直流電力または蓄電池
３の直流出力を正弦波交流電力に変換して出力するイン
バータ４と、商用電源電力とインバータの出力とを負荷
へ切換え出力する切換スイッチ５と、インバータ４の動
作を制御するインバータ制御回路１７とを具備する。そ
してインバータ制御回路１７が、商用電源電圧に位相同
期する基準正弦波発生回路１２の出力信号とインバータ
４の出力帰還電圧Ｖ01とに基づいて得られる波形指令信
号Ｖ1 を出力帰還電圧Ｖ01と共に波形制御回路１４に入
力して誤差信号Ｖ2 を発生し、該誤差信号をＰＷＭ制御
回路１５に入力して得た信号に基いてインバータ４に制
御信号を出力するように構成されている。このような無
停電電源装置において、本発明では、波形制御回路１４
にインバータの出力負荷電流Ｖi0を帰還してインバータ
出力の波形制御を行う。即ち、出力負荷電流を微小量の
フィードバック要素として加える。In order to solve the above problems, an uninterruptible power supply device to which the present invention is applied is, as shown in the embodiment of FIG. 1, a DC output obtained by rectifying commercial power supply. A storage battery 3 to be charged, an inverter 4 for converting DC power or a DC output of the storage battery 3 into sine wave AC power, and outputting the same; a changeover switch 5 for switching and outputting commercial power supply power and the output of the inverter to a load; and an inverter. 4 and an inverter control circuit 17 for controlling the operation of No. 4 of FIG. Then, the inverter control circuit 17 outputs the waveform command signal V1 obtained based on the output signal of the reference sine wave generating circuit 12 and the output feedback voltage V01 of the inverter 4 which are phase-synchronized with the commercial power supply voltage together with the output feedback voltage V01. The error signal V2 is generated by inputting the error signal to the PWM control circuit 14 and the control signal is output to the inverter 4 based on the signal obtained by inputting the error signal to the PWM control circuit 15. In such an uninterruptible power supply device, according to the present invention, the waveform control circuit 14
The output load current Vi0 of the inverter is fed back to the inverter to control the waveform of the inverter output. That is, the output load current is added as a minute feedback element.
【０００７】[0007]
【作用】本発明の無停電電源装置においては、負荷がコ
ンデンサ・インプット形整流回路のような非線形負荷の
場合に、インバータの出力電圧のピーク付近の位相にお
ける電圧瞬時値が微小量減り、インバータの出力負荷電
流Ｖi0の波形は従来の出力制御による場合の波形に比べ
て負荷電流のピーク値が下がり、通流時間幅が広がる。
したがって本発明のように、波形制御回路に出力負荷電
流Ｖi0を帰還すると、負荷力率が向上し、負荷電流の実
効値を小さくすることができる。In the uninterruptible power supply of the present invention, when the load is a non-linear load such as a capacitor input type rectifier circuit, the instantaneous voltage value in the phase near the peak of the output voltage of the inverter is reduced by a small amount, and In the waveform of the output load current Vi0, the peak value of the load current is lower and the conduction time width is wider than the waveform of the conventional output control.
Therefore, when the output load current Vi0 is fed back to the waveform control circuit as in the present invention, the load power factor is improved and the effective value of the load current can be reduced.
【０００８】[0008]
【実施例】次に、本発明の実施例を図１により説明す
る。図１において、１は商用電源、２は整流器、３は整
流器出力により浮動充電される蓄電池、４は蓄電池３の
直流電力を交流電力に変換するインバータ、５は自動切
換手段を備えていて、商用電源１の電力とインバータ４
の出力とを負荷６へ切換え出力する切換スイッチであ
る。１７はインバータ４の動作を制御するインバータ制
御回路で、８はインバータ４の出力電圧Ｖ0 を入力とし
て帰還電圧信号Ｖ01に降圧するトランス、９はフィルタ
回路等により帰還電圧信号Ｖ01の平均値を求める平均値
化回路である。１０は所定の大きさの電圧指令値を出力
する電圧設定器、１１は上記の電圧平均値と電圧指令値
とに基づいて誤差信号を出力する電圧制御回路である。
１２はインバータ４の出力波形の基準となる商用電源電
圧に位相同期する正弦波信号を出力する基準正弦波発生
回路で、この基準正弦波信号と上記の誤差信号を乗算器
１３に入力して、波形指令信号Ｖ1 を得る。７はインバ
ータ４の負荷出力電流Ｉo を検出して、電流Ｉo に応じ
た電流検出信号Ｖioを出力する変流器である。１４は波
形制御回路で、トランス８よりの帰還電圧信号Ｖ01と、
波形指令信号Ｖ1 及び電流検出信号Ｖioを入力として、
誤差信号Ｖ2 を出力する波形制御回路である。１５はこ
の誤差信号Ｖ2 に基づいてＰＷＭ制御信号を出力するＰ
ＷＭ制御回路、１６はＰＷＭ制御信号に応じてインバー
タ４の開閉素子を駆動するドライブ回路である。EXAMPLE An example of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a commercial power source, 2 is a rectifier, 3 is a storage battery that is floatingly charged by the output of the rectifier, 4 is an inverter that converts the DC power of the storage battery 3 into AC power, and 5 is an automatic switching means. Power of power source 1 and inverter 4
And the output of the switch are output to the load 6. Reference numeral 17 is an inverter control circuit for controlling the operation of the inverter 4, 8 is a transformer which receives the output voltage V0 of the inverter 4 and steps down to the feedback voltage signal V01, and 9 is an average for obtaining the average value of the feedback voltage signal V01 by a filter circuit or the like. It is a digitization circuit. Reference numeral 10 is a voltage setting device that outputs a voltage command value of a predetermined magnitude, and 11 is a voltage control circuit that outputs an error signal based on the voltage average value and the voltage command value.
Reference numeral 12 is a reference sine wave generating circuit that outputs a sine wave signal that is phase-synchronized with a commercial power supply voltage that serves as a reference for the output waveform of the inverter 4. The reference sine wave signal and the error signal are input to a multiplier 13, The waveform command signal V1 is obtained. A current transformer 7 detects the load output current Io of the inverter 4 and outputs a current detection signal Vio corresponding to the current Io. Reference numeral 14 is a waveform control circuit, and a feedback voltage signal V01 from the transformer 8
With the waveform command signal V1 and the current detection signal Vio as inputs,
The waveform control circuit outputs the error signal V2. 15 is a P which outputs a PWM control signal based on this error signal V2
The WM control circuit, 16 is a drive circuit for driving the switching element of the inverter 4 according to the PWM control signal.
【０００９】次に、本実施例の動作を説明する。本実施
例の無停電電源装置においては、常時は商用電源１の電
力が切換スイッチ５を通して負荷６へ給電されていて、
商用電源の異常時に切換スイッチ５が自動的に切換えら
れて、インバータ４の出力が負荷６へ給電される。イン
バータ制御回路１７においては、電圧制御回路１１が平
均値化回路９と電圧設定器１０の設定電圧に基づいて誤
差信号を出力し、この信号と基準正弦波発生回路１２の
基準正弦波出力信号が乗算器１３に入力されて、乗算器
１３より波形指令信号Ｖ1 が出力される。波形制御回路
１４はトランス８からの帰還電圧信号Ｖ01、波形指令信
号Ｖ1 及び変流器７からの電流検出信号Ｖioに基づいて
誤差信号Ｖ2 を出力する。ＰＷＭ制御回路１５は、誤差
信号Ｖ2に基づいてＰＷＭ制御信号を出力し、この制御
信号に応じてドライブ回路１６が動作してインバータ４
の開閉素子を制御し、インバータ４の出力電圧及び出力
電流波形を制御する。Next, the operation of this embodiment will be described. In the uninterruptible power supply system of this embodiment, the power of the commercial power supply 1 is always supplied to the load 6 through the changeover switch 5.
When the commercial power supply is abnormal, the changeover switch 5 is automatically changed over so that the output of the inverter 4 is supplied to the load 6. In the inverter control circuit 17, the voltage control circuit 11 outputs an error signal based on the set voltages of the averaging circuit 9 and the voltage setter 10, and this signal and the reference sine wave output signal of the reference sine wave generation circuit 12 It is input to the multiplier 13, and the waveform command signal V1 is output from the multiplier 13. The waveform control circuit 14 outputs the error signal V2 based on the feedback voltage signal V01 from the transformer 8, the waveform command signal V1 and the current detection signal Vio from the current transformer 7. The PWM control circuit 15 outputs a PWM control signal based on the error signal V2, and the drive circuit 16 operates according to the control signal to operate the inverter 4
It controls the open / close element of and the output voltage and output current waveforms of the inverter 4.
【００１０】図２（Ａ）は、上記の動作におけるインバ
ータ出力電圧Ｖ0 （帰還電圧信号Ｖ01），出力負荷電流
Ｉo （電流検出信号Ｖio）の関係を実線で示し、図２
（Ｂ）は波形指令信号Ｖ1 を示し、図２（Ｃ）は誤差信
号Ｖ2 の波形の例を実線で示したものである。この場合
の無停電電源装置の負荷６としては、図３に示したよう
な回路構成の非線形負荷、即ち、ダイオードのブリッジ
回路１９からなる全波整流器の出力端に並列に、電解コ
ンデンサ２０と可変抵抗２１を接続したものを用いた。
図２（Ａ）及び（Ｃ）において、信号Ｖ0 （Ｖ01），Ｉ
o （Ｖio），Ｖ2の各波形の点線は、波形制御回路１４
の入力にインバータの出力負荷電流Ｉo の検出信号Ｖio
を帰還しないで、波形制御回路１４が出力する誤差信号
Ｖ2 の直流分を検出した信号を波形制御回路１４の入力
側に帰還する図４に示した従来の装置における各波形を
示したものである。図２に見られるように、本実施例に
おいてはインバータ出力負荷電流Ｉo の波形が、点線で
示す従来の制御による場合の波形に比べて、負荷電流の
ピーク値が下がり、通流時間幅が広がるようになる。こ
れにより負荷力率が向上し、負荷電流の実効値が小さく
なることになる。FIG. 2A is a solid line showing the relationship between the inverter output voltage V0 (feedback voltage signal V01) and the output load current Io (current detection signal Vio) in the above operation.
2B shows the waveform command signal V1, and FIG. 2C shows an example of the waveform of the error signal V2 by a solid line. The load 6 of the uninterruptible power supply in this case is a non-linear load having a circuit configuration as shown in FIG. 3, that is, in parallel with the output terminal of the full-wave rectifier composed of the diode bridge circuit 19 and variable with the electrolytic capacitor 20. The one to which the resistor 21 was connected was used.
2A and 2C, the signals V0 (V01), I
The dotted line of each waveform of o (Vio) and V2 is the waveform control circuit 14
To the input of the detection signal Vio of the output current Io of the inverter
5 shows each waveform in the conventional device shown in FIG. 4 in which the signal obtained by detecting the DC component of the error signal V2 output from the waveform control circuit 14 is not fed back to the input side of the waveform control circuit 14. . As shown in FIG. 2, in the present embodiment, the waveform of the inverter output load current Io has a lower peak value of the load current and a wider conduction time width than the waveform of the conventional control shown by the dotted line. Like As a result, the load power factor is improved and the effective value of the load current is reduced.
【００１１】次に、本発明の実施例において得られた数
値的効果の一例を次表に示す。Next, an example of the numerical effect obtained in the embodiment of the present invention is shown in the following table.
【００１２】[0012]
【表１】 この試験では図３の整流負荷回路を用いており、電解コ
ンデンサ２０は３３００μＦであった。この試験の結果
を見ると、負荷力率が従来０．５３３であったものが
０．６３５となり、負荷電流が従来３０Ａであったもの
が２５．２Ａになっている。したがってインバータの主
回路構成部品のみならず、負荷のコンデンサインプット
形整流回路の構成部品に対しても電流負担の軽減になっ
ている。[Table 1] In this test, the rectification load circuit of FIG. 3 was used, and the electrolytic capacitor 20 had a value of 3300 μF. Looking at the results of this test, the load power factor of the conventional 0.533 is 0.635, and the load current of the conventional 30A is 25.2A. Therefore, not only the main circuit components of the inverter but also the components of the load capacitor input type rectifier circuit are reduced in current load.
【００１３】[0013]
【発明の効果】以上述べたように、本発明の無停電電源
装置によれば、インバータの出力負荷電流を波形制御回
路に帰還して誤差信号を得ているため、負荷がコンデン
サ・インプット形整流回路のような非線形負荷の場合
に、インバータ出力負荷電流の波形を従来の出力制御に
よる場合の波形に比べて、負荷電流のピーク値が下げ
て、通流時間幅を広げることができる。これにより負荷
力率を向上させ、負荷電流の実効値を低下させることが
できる利点ががある。As described above, according to the uninterruptible power supply of the present invention, since the output load current of the inverter is fed back to the waveform control circuit to obtain the error signal, the load is a capacitor input type rectifier. In the case of a non-linear load such as a circuit, the peak value of the load current can be lowered and the conduction time width can be widened as compared with the waveform of the inverter output load current when compared with the conventional output control waveform. This has the advantage that the load power factor can be improved and the effective value of the load current can be reduced.
【図１】本発明の一実施例の回路構成を示すブロック図
である。FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention.
【図２】（Ａ）〜（Ｃ）は図１の実施例の各部の信号波
形を示す波形図である。2A to 2C are waveform charts showing signal waveforms of respective portions of the embodiment of FIG.
【図３】負荷の一例を示す回路図である。FIG. 3 is a circuit diagram showing an example of a load.
【図４】従来の無停電電源装置の構成を示すブロック図
である。FIG. 4 is a block diagram showing a configuration of a conventional uninterruptible power supply device.
１ 商用電源 ２ 整流器 ３ 蓄電池 ４ インバータ ５ 切換スイッチ ６ 負荷 ７ 変流器 ９ 平均値化回路 １０ 電圧設定器 １１ 電圧制御回路 １２ 基準正弦波発生回路 １４ 波形制御回路 １５ ＰＷＭ制御回路 １６ ドライブ回路 １７ インバータ制御回路 1 Commercial power supply 2 Rectifier 3 Storage battery 4 Inverter 5 Changeover switch 6 Load 7 Current transformer 9 Averager circuit 10 Voltage setting device 11 Voltage control circuit 12 Reference sine wave generating circuit 14 Waveform control circuit 15 PWM control circuit 16 Drive circuit 17 Inverter Control circuit
Claims (1)
電される蓄電池と、前記直流電力または前記蓄電池の直
流出力を正弦波交流電力に変換して出力するインバータ
と、前記商用電源電力と前記インバータの出力とを負荷
へ切換え出力する切換スイッチと、前記インバータの動
作を制御するインバータ制御回路とを具備し、 前記インバータ制御回路が、商用電源電圧に位相同期す
る基準正弦波発生回路の出力信号と前記インバータの出
力帰還電圧とに基づいて得られる波形指令信号を前記出
力帰還電圧と共に波形制御回路に入力して誤差信号を発
生し、該誤差信号をＰＷＭ制御回路に入力して得た信号
に基いて前記インバータに制御信号を出力するように構
成されている無停電電源装置において、 前記インバータ制御回路の前記波形制御回路に前記イン
バータの出力負荷電流を帰還してインバータ出力の波形
制御を行うようにしたことを特徴とする無停電電源装
置。1. A storage battery charged by a DC output obtained by rectifying a commercial power supply, an inverter for converting the DC power or a DC output of the storage battery into a sinusoidal AC power and outputting the same, the commercial power supply and the inverter. And an output signal of a reference sine wave generating circuit that is phase-synchronized with the commercial power supply voltage, and an inverter control circuit that controls the operation of the inverter. A waveform command signal obtained based on the output feedback voltage of the inverter is input to the waveform control circuit together with the output feedback voltage to generate an error signal, and the error signal is input to the PWM control circuit based on the signal obtained. In the uninterruptible power supply configured to output a control signal to the inverter, the waveform control of the inverter control circuit Uninterruptible power supply, wherein by feeding back the output load current of the inverter that to perform the waveform control of the inverter output to the road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29772793A JP3246138B2 (en) | 1993-11-29 | 1993-11-29 | Uninterruptible power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29772793A JP3246138B2 (en) | 1993-11-29 | 1993-11-29 | Uninterruptible power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07154975A true JPH07154975A (en) | 1995-06-16 |
| JP3246138B2 JP3246138B2 (en) | 2002-01-15 |
Family
ID=17850402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29772793A Expired - Lifetime JP3246138B2 (en) | 1993-11-29 | 1993-11-29 | Uninterruptible power system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3246138B2 (en) |
-
1993
- 1993-11-29 JP JP29772793A patent/JP3246138B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3246138B2 (en) | 2002-01-15 |
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