JP2009194981A - Instantaneous voltage drop compensator - Google Patents

Instantaneous voltage drop compensator Download PDF

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JP2009194981A
JP2009194981A JP2008031582A JP2008031582A JP2009194981A JP 2009194981 A JP2009194981 A JP 2009194981A JP 2008031582 A JP2008031582 A JP 2008031582A JP 2008031582 A JP2008031582 A JP 2008031582A JP 2009194981 A JP2009194981 A JP 2009194981A
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change amount
frequency
inverter
load current
voltage sag
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JP5071139B2 (en
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Junichi Watanabe
渡辺　　純一
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an instantaneous voltage drop compensator capable of minimizing the influence of synchronization by frequency change on a load. <P>SOLUTION: The instantaneous voltage drop compensator includes: a phase difference detection unit 1 that detects any phase difference between system voltage produced by a power supply 11 and inverter voltage produced by an inverter; an amount of change detection unit 2 that detects an amount of change in load current as a variation in load current; a limiter 3 that varies an amount of change in frequency by varying a limit width according to the phase difference and the variation in load current; and a frequency generation unit 4 that generates a frequency of inverter sine waves according to the limit width and an inverter control internal frequency. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、瞬低補償装置に関する。   The present invention relates to a voltage sag compensator.

従来から、電源の瞬低時に電池や電気二重層キャパシタ等のエネルギー蓄積要素から電力を供給する瞬低補償装置が知られている。
図７は、従来の瞬低補償装置のシステム構成を示した図である。
図７に示すように、従来の瞬低補償装置は、瞬低時に負荷１０を電源１１から解列するための高速スイッチ１２と、瞬低時に電源１１の代わりとなるインバータ（ＰＣＳ）１３と、高速スイッチ１２及びインバータ１３を制御する制御装置１４と、エネルギーを蓄積する蓄積要素１５とにより構成されている。 2. Description of the Related Art Conventionally, a voltage sag compensator that supplies power from an energy storage element such as a battery or an electric double layer capacitor when a power voltage is sunk is known.
FIG. 7 is a diagram showing a system configuration of a conventional voltage sag compensator.
As shown in FIG. 7, the conventional voltage sag compensator includes a high-speed switch 12 for disconnecting the load 10 from the power source 11 at the time of voltage sag, an inverter (PCS) 13 instead of the power source 11 at the time of voltage sag, It is comprised by the control apparatus 14 which controls the high speed switch 12 and the inverter 13, and the storage element 15 which accumulate | stores energy.

図８は、従来の瞬低補償装置の動作タイミングを示した図である。
図８中にＣで示す期間は、電源１１の正常時であり、電源１１から負荷１０へ給電しており、このとき制御装置１４は系統電圧の位相情報を検出し、電源１１による系統電圧と同位相の電圧指令を更新し、瞬低補償動作に備えている。 FIG. 8 is a diagram showing the operation timing of the conventional voltage sag compensator.
The period indicated by C in FIG. 8 is when the power supply 11 is normal, and power is supplied from the power supply 11 to the load 10. At this time, the control device 14 detects phase information of the system voltage, The voltage command of the same phase is updated to prepare for the instantaneous drop compensation operation.

瞬低が発生すると、制御装置１４は高速に瞬低を検出し、高速スイッチ１２にオフ指令を与えて負荷１０を電源１１から解列し、同時にインバータ１３を始動して蓄積要素１５の直流エネルギーをインバータ１３で交流に変換し、負荷１０へ無瞬断で電力を供給する。
図８中にＡで示す期間は、電源１１の瞬低時であり、制御装置１４内で更新されていた瞬低前の位相情報により運転される。 When a voltage sag occurs, the control device 14 detects the voltage sag at high speed, gives an OFF command to the high speed switch 12, disconnects the load 10 from the power source 11, and simultaneously starts the inverter 13 to direct the DC energy of the storage element 15. Is converted into alternating current by the inverter 13 and electric power is supplied to the load 10 without interruption.
A period indicated by A in FIG. 8 is when the power supply 11 is instantaneously reduced, and the operation is performed based on the phase information before the instantaneous decrease that has been updated in the control device 14.

図８中にＢで示す期間は、系統が復電すると、系統自体の位相変化や制御装置１４の精度により、系統電圧の位相とインバータ１３の電圧の位相との間に、位相差が発生する可能性があるため、インバータ１３は系統電圧に位相合わせ（以下、同期合わせとする）を行う。同期合わせが完了すると高速スイッチ１２をオンにし、電源１１からの給電へ切り換えて次の瞬低に備える。なお、図８中にＢで示す期間は、厳密に言うと、同期合わせ完了後から瞬低補償装置停止までの期間も含んでいるが、ここでは説明のため同期合わせ期間として簡略化して説明する。   In the period indicated by B in FIG. 8, when the system is restored, a phase difference is generated between the phase of the system voltage and the phase of the voltage of the inverter 13 due to the phase change of the system itself and the accuracy of the control device 14. Since there is a possibility, the inverter 13 performs phase alignment (hereinafter referred to as synchronization alignment) with the system voltage. When the synchronization is completed, the high-speed switch 12 is turned on to switch to the power supply from the power source 11 to prepare for the next instantaneous drop. Strictly speaking, the period indicated by B in FIG. 8 includes the period from the completion of synchronization alignment to the stop of the voltage sag compensator, but here it will be simplified and described as the synchronization alignment period. .

特開２００１−１８６６９０号公報JP 2001-186690 A

図９は、従来の瞬低補償装置の同期合わせ回路を示した図である。
図９に示すように、従来の瞬低補償装置の同期合わせ回路は、系統電圧とインバータ電圧との位相差（±Δｔ）を検出する位相差検出部２０と、位相差検出部２０で検出した位相差により固定された規定のリミッタ特性に基く固定されたリミット幅（±Δｔ’）を有するリミッタ２１と、リミッタ２１のリミット幅とインバータ制御内部周波数ｆｒｅｆ（周期はＴ＝１／ｆｒｅｆ）とに応じてインバータ正弦波の周波数[１／（Ｔ±Δｔ’）]を生成する周波数生成部２２とにより構成されている。 FIG. 9 is a diagram showing a synchronization circuit of a conventional voltage sag compensator.
As shown in FIG. 9, the synchronization circuit of the conventional voltage sag compensator detects the phase difference detection unit 20 that detects the phase difference (± Δt) between the system voltage and the inverter voltage, and the phase difference detection unit 20 detects the phase difference. A limiter 21 having a fixed limit width (± Δt ′) based on a specified limiter characteristic fixed by the phase difference, and the limit width of the limiter 21 and the inverter control internal frequency fref (period is T = 1 / fref). Accordingly, the frequency generator 22 generates a frequency [1 / (T ± Δt ′)] of the inverter sine wave.

このように、従来の瞬低補償装置では、系統電圧とインバータ電圧との位相差を、ある固定された規定値のリミット幅に基き周波数を生成することで、同期合わせ期間Ｂ（図８参照）の位相変化量を制限している。そして、位相差の基準を系統電圧とし、インバータ電圧の位相が進んでいる場合は正として周波数を下げ、遅れている場合は負として周波数を上げている。   Thus, in the conventional voltage sag compensator, the phase difference between the system voltage and the inverter voltage is generated based on the limit width of a fixed specified value, thereby synchronizing period B (see FIG. 8). The amount of phase change is limited. Then, the system voltage is used as a reference for the phase difference, and when the phase of the inverter voltage is advanced, the frequency is decreased as positive, and when it is delayed, the frequency is increased as negative.

ところで、瞬低補償装置は、短時間の補償に限定した装置であるため（例えば、１秒から１０秒程度）、エネルギーの蓄積要素１５は経済性、外形寸法等から容量が限定され、同期合わせも短時間で行わなければならない。   By the way, since the sag compensation device is a device limited to short-time compensation (for example, about 1 to 10 seconds), the capacity of the energy storage element 15 is limited due to economy, external dimensions, etc. Also must be done in a short time.

しかしながら、同期合わせは、周波数の変化により行うため、同期合わせを短時間で行うためには、周波数の変可量も大きくする必要があり、周波数の変化に敏感な装置であるインバータ１３では過電流による装置停止が生ずる虞があり、モーター負荷等では、回転数やトルクの急変等により、負荷１０に影響を与える虞がある。   However, since the synchronization is performed by changing the frequency, in order to perform the synchronization in a short time, it is necessary to increase the variable amount of the frequency. In the inverter 13 which is a device sensitive to the change of the frequency, an overcurrent is required. There is a possibility that the apparatus stops due to the motor load, and the motor load or the like may affect the load 10 due to a sudden change in the rotational speed or torque.

以上のことから、本発明は、周波数変化による同期合わせ時における負荷への影響を最小限に抑えることができる瞬低補償装置を提供することを目的とする。   In view of the above, an object of the present invention is to provide a voltage sag compensator capable of minimizing the influence on a load at the time of synchronization due to a frequency change.

上記の課題を解決するための第１の発明に係る瞬低補償装置は、
電源により生ずる系統電圧とインバータにより生ずるインバータ電圧との位相差を検出する位相差検出部と、
負荷電流の変化量を負荷電流変化量として検出する変化量検出部と、
前記位相差と前記負荷電流変化量とに応じてリミット幅を変化させることで周波数変化量を変化させるリミッタと、
前記リミット幅とインバータ制御内部周波数とに応じてインバータ正弦波の周波数を生成する周波数生成部と
を備える
ことを特徴とする。 The voltage sag compensator according to the first invention for solving the above-mentioned problem is
A phase difference detector for detecting a phase difference between a system voltage generated by a power source and an inverter voltage generated by an inverter;
A change amount detection unit that detects a change amount of the load current as a load current change amount;
A limiter that changes a frequency change amount by changing a limit width according to the phase difference and the load current change amount;
A frequency generation unit that generates an inverter sine wave frequency according to the limit width and the inverter control internal frequency is provided.

上記の課題を解決するための第２の発明に係る瞬低補償装置は、第１の発明に係る瞬低補償装置において、
前記リミッタは、前記負荷電流変化量が設定値以上の場合に周波数変化量を小さくする
ことを特徴とする。 A voltage sag compensator according to a second invention for solving the above problem is the voltage sag compensator according to the first invention.
The limiter reduces the amount of change in frequency when the amount of change in load current is equal to or greater than a set value.

上記の課題を解決するための第３の発明に係る瞬低補償装置は、第１の発明又は第２の発明に係る瞬低補償装置において、
前記リミッタは、前記負荷電流変化量が設定値以下の場合に周波数変化量を大きくする
ことを特徴とする。 A voltage sag compensator according to a third invention for solving the above problem is the voltage sag compensator according to the first invention or the second invention.
The limiter increases the frequency change amount when the load current change amount is equal to or less than a set value.

本発明によれば、周波数変化による同期合わせ時における負荷への影響を低減することが可能な瞬低補償装置を実現することができる。   According to the present invention, it is possible to realize a voltage sag compensator capable of reducing the influence on a load at the time of synchronization due to a frequency change.

本発明に係る瞬低補償装置の実施例について、図を用いて説明する。なお、本発明に係る瞬低補償装置の基本的な構成については、上述した図６に示す従来の瞬低補償装置のシステム構成と同様であるため、ここでの説明は省略する。また、実施例中の説明で用いる符号は図６で用いたものと同じ符号を用いるものとする。   Embodiments of a voltage sag compensator according to the present invention will be described with reference to the drawings. Since the basic configuration of the voltage sag compensator according to the present invention is the same as the system configuration of the conventional voltage sag compensator shown in FIG. 6 described above, the description thereof is omitted here. The reference numerals used in the description of the embodiments are the same as those used in FIG.

以下、本発明に係る瞬低補償装置の第１の実施例について説明する。
図１は、本実施例に係る瞬低補償装置の同期合わせ回路を示した図、図２は、本実施例に係る瞬低補償装置の同期合わせ回路におけるリミッタ特性を示した図である、図３は、本実施例に係る瞬低補償装置の同期合わせの様子を示した図である。 The first embodiment of the voltage sag compensator according to the present invention will be described below.
FIG. 1 is a diagram illustrating a synchronization circuit of the voltage sag compensator according to the present embodiment, and FIG. 2 is a diagram illustrating limiter characteristics of the synchronization circuit of the voltage sag compensator according to the present embodiment. 3 is a diagram illustrating a state of synchronization of the voltage sag compensator according to the present embodiment.

図１に示すように、本実施例に係る瞬低補償装置の同期合わせ回路は、電源１１により生ずる系統電圧とインバータ１３により生ずるインバータ電圧との位相差（±Δｔ）を検出する位相差検出部１と、負荷電流の変化量（負荷電流変化量）を検出する変化量検出部２と、位相差検出部１で検出した位相差と変化量検出部２で検出した負荷電流変化量とに応じてリミッタ特性を変化させてリミット幅（±Δｔ’）を変化させるリミッタ３と、リミッタ３のリミット幅とインバータ制御内部周波数ｆｒｅｆ（周期はＴ＝１／ｆｒｅｆ）とに応じてインバータ正弦波の周波数（１／Ｔ±Δｔ’）を生成する周波数生成部４とにより構成されている。   As shown in FIG. 1, the synchronization circuit of the voltage sag compensator according to this embodiment includes a phase difference detection unit that detects a phase difference (± Δt) between a system voltage generated by a power supply 11 and an inverter voltage generated by an inverter 13. 1, a change amount detection unit 2 that detects a change amount of the load current (a change amount of load current), a phase difference detected by the phase difference detection unit 1, and a load current change amount detected by the change amount detection unit 2 The limiter 3 that changes the limiter characteristic to change the limit width (± Δt ′), and the frequency of the inverter sine wave according to the limit width of the limiter 3 and the inverter control internal frequency fref (cycle is T = 1 / fref) The frequency generator 4 generates (1 / T ± Δt ′).

なお、本実施例においては、例として、位相差検出部１は、系統電圧の位相を基準として、系統電圧とインバータ電圧との位相差（±Δｔ）を検出している。また、本実施例に係る瞬低補償装置では、リミッタ３のリミッタ特性を保存し、外部回路（ＰＣ等）へ出力する機能を持たせることも可能である。   In the present embodiment, as an example, the phase difference detection unit 1 detects the phase difference (± Δt) between the system voltage and the inverter voltage with reference to the phase of the system voltage. Further, in the voltage sag compensator according to the present embodiment, it is possible to have a function of storing the limiter characteristic of the limiter 3 and outputting it to an external circuit (PC or the like).

ところで、従来の瞬低補償装置では、系統電圧とインバータ電圧の位相差（±Δｔ）に対して１サイクルあたりの周波数変化量は負荷電流変化量の大小に関わらず固定値であった。なお、以下の説明において、従来の瞬低補償装置における固定された周波数変化量を規定値の周波数変化量と呼び、この規定値の周波数変化量による同期合わせ時間を規定の同期合わせ時間と呼ぶこととする。   By the way, in the conventional voltage sag compensator, the frequency change amount per cycle is a fixed value regardless of the magnitude of the load current change amount with respect to the phase difference (± Δt) between the system voltage and the inverter voltage. In the following description, the fixed frequency change amount in the conventional voltage sag compensator is referred to as a specified frequency change amount, and the synchronization time based on the specified frequency change amount is referred to as a specified synchronization time. And

従来の瞬低補償装置に対し、本実施例に係る瞬低補償装置は、負荷電流の変化を変化量検出部により検出して、負荷電流変化量が設定値以下の場合には、図２（ａ）に示すようにリミッタ３のリミッタ特性を変化させずにリミット幅を維持し、規定値の周波数変化量を維持する。なお、設定値については、規定値の周波数変化量により同期合わせをした場合に、負荷１０に与える影響がない又は少ない範囲に応じて適宜設定する。   In contrast to the conventional voltage sag compensator, the voltage sag compensator according to the present embodiment detects a change in the load current by the change amount detection unit, and when the load current change amount is equal to or less than the set value, FIG. As shown in a), the limit width is maintained without changing the limiter characteristic of the limiter 3, and the frequency change amount of the specified value is maintained. Note that the set value is appropriately set according to a range that has no or little influence on the load 10 when synchronization is performed with the frequency change amount of the specified value.

図３（ａ）に示すように、本実施例に係る瞬低補償装置では、負荷電流変化量が設定値以下の場合には、図３（ａ）中に実線で示すように、負荷１０に影響を与えることがないため、規定の同期合わせ時間（以下、Ｔa1とする）で規定値の周波数変化量で同期合わせを行うことができる。 As shown in FIG. 3A, in the voltage sag compensator according to this embodiment, when the load current change amount is equal to or less than the set value, the load 10 is applied as shown by the solid line in FIG. Since there is no influence, synchronization can be performed with a specified amount of frequency change in a specified synchronization time (hereinafter referred to as Ta1 ).

また、負荷電流変化量が設定値以上の場合には、図２（ｂ）に示すようにリミッタ３のリミッタ特性を変化させてリミット幅を縮小することで、単位時間当たりの周波数変化量を規定値よりも小さくする。この場合、同期合わせが完了するまでの時間は長くなるが、負荷１０への影響は低減することができる。   Further, when the load current change amount is equal to or larger than the set value, the frequency change amount per unit time is defined by reducing the limit width by changing the limiter characteristic of the limiter 3 as shown in FIG. Make it smaller than the value. In this case, the time until synchronization is completed becomes longer, but the influence on the load 10 can be reduced.

図３（ｂ）に示すように、本実施例に係る瞬低補償装置では、負荷電流変化量が設定値以上の場合には、図３（ｂ）に実線で示すように、単位時間当たりの周波数変化量を規定値よりも小さくすることにより、同期合わせ時間（以下、Ｔbとする）はＴa1に比べ長くなるが、負荷１０に与える影響を低減することができる。これに対し、従来の瞬低補償装置では、負荷電流変化量が設定値以上の場合にも、図３（ｂ）中に一点鎖線で示すように、規定値の周波数変化量で同期合わせを行うため、負荷１０に大きな影響を与えてしまう。 As shown in FIG. 3B, in the voltage sag compensator according to the present embodiment, when the load current change amount is equal to or larger than the set value, as shown by a solid line in FIG. By making the frequency change amount smaller than the specified value, the synchronization time (hereinafter referred to as T b ) becomes longer than T a1 , but the influence on the load 10 can be reduced. On the other hand, in the conventional voltage sag compensator, even when the amount of change in the load current is equal to or greater than the set value, synchronization is performed with the frequency change amount of the specified value, as indicated by a one-dot chain line in FIG. Therefore, the load 10 is greatly affected.

以上のように、本実施例に係る瞬低補償装置によれば、同期合わせの周波数変化量を負荷電流変化量により可変とし、負荷電流変化量が一定量以上あった場合には、単位時間当たりの周波数変化量を規定値よりも小さくすることで、周波数や位相の変化に敏感な装置（例えば、インバータ１３）が負荷１０に接続されている場合であっても、負荷１０に与える影響を最小限に抑えることができる。   As described above, according to the voltage sag compensator according to the present embodiment, the amount of change in synchronization frequency is variable according to the amount of change in load current, and when the amount of change in load current exceeds a certain amount, By making the frequency change amount of the signal smaller than the specified value, the influence on the load 10 is minimized even when a device (for example, the inverter 13) sensitive to the change in frequency and phase is connected to the load 10. To the limit.

以下、本実施例に係る瞬低補償装置の第２の実施例について説明する。
図４は、本実施例に係る瞬低補償装置の同期合わせ回路におけるリミッタ特性を示した図、図５は、本実施例に係る瞬低補償装置の同期合わせの様子を示した図である。 The second embodiment of the voltage sag compensator according to this embodiment will be described below.
FIG. 4 is a diagram showing limiter characteristics in the synchronization circuit of the voltage sag compensator according to the present embodiment, and FIG. 5 is a diagram showing a state of synchronization of the voltage sag compensator according to the present example.

なお、本実施例に係る瞬低補償装置の基本的な構成については、第１の実施例に係る瞬低補償装置と同様であるためここでの詳細な説明は省略する。また、本実施例中の説明で用いる符号は図１で用いたものと同じ符号を用いるものとする。
ところで、第１の実施例に係る瞬低補償装置では、負荷電流変化量が設定値以下の場合には、規定値の周波数変化量をそのまま維持していた。 Note that the basic configuration of the voltage sag compensator according to the present embodiment is the same as that of the voltage sag compensator according to the first embodiment, and a detailed description thereof will be omitted here. Further, the reference numerals used in the description of the present embodiment are the same as those used in FIG.
Incidentally, in the voltage sag compensator according to the first embodiment, when the load current change amount is equal to or less than the set value, the frequency change amount of the specified value is maintained as it is.

第１の実施例に係る瞬低補償装置に対し、本実施例に係る瞬低補償装置は、負荷電流変化量が設定値以下の場合には、同期合わせ時間の短縮のため、図４（ａ）に示すようにリミッタ３のリミッタ特性を変化させてリミット幅を拡大することで、周波数変化量を大きくする。   In contrast to the voltage sag compensator according to the first embodiment, the voltage sag compensator according to the present example is shown in FIG. As shown in (2), the limiter characteristic of the limiter 3 is changed to increase the limit width, thereby increasing the frequency change amount.

なお、これは、負荷電流変化量に応じて周波数変化量を可変としたことにより、負荷電流変化量が大きいときにもできるだけ対応可能なように、規定値として中間的な値の周波数変化量を設定する必要がなくなったことにより、はじめて可能となったものである。また、設定値については、規定値の周波数変化量により同期合わせをした場合に、負荷１０に与える影響がない又は少ない範囲に応じて適宜設定する。   Note that this is because the frequency change amount is made variable according to the load current change amount, so that an intermediate value frequency change amount can be set as a specified value so that it can be handled as much as possible even when the load current change amount is large. This is possible for the first time because there is no need to set it. In addition, the set value is appropriately set according to a range that has no or little influence on the load 10 when synchronization is performed with the frequency change amount of the specified value.

図５（ａ）に示すように、従来の瞬低補償装置と同じように負荷電流変化量が設定値以上の場合にも、規定値の周波数変化量で同期合わせを行った場合、図５（ａ）中に一点鎖線で示すように、同期合わせに要する時間は従来の瞬低補償装置と同じくＴa1（図３参照）だけかかってしまう。しかしながら、本実施例に係る瞬低補償装置では、負荷電流変化量が設定値以上の場合には、図５（ａ）中に実線で示すように、単位時間当たりの周波数変化量を規定値よりも大きくすることにより、同期合わせ時間（以下、Ｔa2とする）を、図５（ａ）中にＴSで示す分だけ短縮して、Ｔa2＜Ｔa1とすることができる。 As shown in FIG. 5A, when the load current change amount is equal to or larger than the set value as in the conventional voltage sag compensator, when synchronization is performed with the specified frequency change amount, As indicated by the alternate long and short dash line in a), the time required for synchronization is only T a1 (see FIG. 3) as in the conventional voltage sag compensator. However, in the voltage sag compensator according to the present embodiment, when the load current change amount is greater than or equal to the set value, the frequency change amount per unit time is less than the specified value as shown by the solid line in FIG. As a result, the synchronization time (hereinafter referred to as T a2 ) can be shortened by T S in FIG. 5A to satisfy T a2 <T a1 .

また、負荷電流変化量が設定値以上の場合には、第１の実施例に係る瞬低補償装置と同様に、図４（ｂ）に示すようにリミッタ３のリミッタ特性を変化させてリミット幅を縮小することで、単位時間当たりの周波数変化量を規定値よりも小さくする。この場合、同期合わせが完了するまでの時間は長くなるが、負荷１０への影響は低減することができる。   When the load current change amount is equal to or larger than the set value, the limiter width of the limiter 3 is changed as shown in FIG. 4 (b) to change the limit width as in the voltage sag compensator according to the first embodiment. Is reduced to make the frequency change amount per unit time smaller than the specified value. In this case, the time until synchronization is completed becomes longer, but the influence on the load 10 can be reduced.

図５（ｂ）に示すように、本実施例に係る瞬低補償装置では、負荷電流変化量が設定値以上の場合には、図５（ｂ）中に実線で示すように単位時間当たりの周波数変化量を規定値よりも小さくすることにより、同期合わせ時間（以下、Ｔbとする）はＴa1（図３参照）に比べ長くなるが、負荷１０に与える影響を低減することができる。これに対し、従来の瞬低補償装置では、負荷電流変化量が設定値以上の場合にも、図５（ｂ）中に一点鎖線で示すように、規定値の周波数変化量で同期合わせを行うため、負荷１０に大きな影響を与えてしまう。 As shown in FIG. 5B, in the voltage sag compensator according to the present embodiment, when the load current change amount is equal to or larger than the set value, as shown by a solid line in FIG. By making the frequency change amount smaller than the specified value, the synchronization time (hereinafter referred to as T b ) becomes longer than T a1 (see FIG. 3), but the influence on the load 10 can be reduced. On the other hand, in the conventional voltage sag compensator, even when the amount of change in the load current is equal to or larger than the set value, synchronization is performed with the frequency change amount of the specified value, as indicated by a one-dot chain line in FIG. Therefore, the load 10 is greatly affected.

図６は、本実施例に係る瞬低補償装置の動作タイミングを示した図である。なお、図６中にＡで示す期間は瞬低補償期間を、図６中にＢで示す期間は同期合わせ期間を、図６中にＣで示す期間は瞬低補償装置の停止期間を示している。なお、Ｂで示す期間は、厳密に言うと、同期合わせ完了後から瞬低補償装置停止までの期間も含んでいるが、ここでは説明のため、同期合わせ期間として簡略化して説明する。   FIG. 6 is a diagram illustrating the operation timing of the voltage sag compensator according to the present embodiment. The period indicated by A in FIG. 6 indicates the sag compensation period, the period indicated by B in FIG. 6 indicates the synchronization period, and the period indicated by C in FIG. 6 indicates the stop period of the sag compensation device. Yes. Strictly speaking, the period indicated by B includes the period from the completion of the synchronization adjustment to the stop of the voltage sag compensator, but for the sake of explanation, the period will be simplified and described here.

図６に示すように、本実施例に係る瞬低補償装置は、瞬低が発生すると、瞬低補償期間Ａ→同期合わせ期間Ｂ→停止期間Ｃの動作を行う。そして、本実施例に係る瞬低補償装置によれば、瞬低補償期間Ａを延ばすことができる。これは、蓄電要素１５に必要とされるエネルギー量は、瞬低補償期間Ａと同期合わせ期間Ｂとに必要とされるエネルギー量により決定されるためである。したがって、本実施例に係る瞬低補償装置によれば、同期合わせ期間Ｂを短縮することができ、同期合わせ期間Ｂの短縮は蓄電要素１５の容量を減らすことができる他、同じ容量の蓄電要素１５を用いた場合には瞬低補償期間Ａの時間を長く取れることができる。   As illustrated in FIG. 6, the voltage sag compensator according to the present embodiment operates in a voltage sag compensation period A → synchronization period B → stop period C when a voltage sag occurs. Then, according to the voltage sag compensator according to the present embodiment, the voltage sag compensation period A can be extended. This is because the amount of energy required for the power storage element 15 is determined by the amount of energy required for the sag compensation period A and the synchronization period B. Therefore, according to the voltage sag compensator according to the present embodiment, the synchronization period B can be shortened, and the shortening of the synchronization period B can reduce the capacity of the power storage element 15 as well as the power storage elements having the same capacity. When 15 is used, it is possible to lengthen the sag compensation period A.

以上のように、本実施例に係る瞬低補償装置によれば、同期合わせの周波数変化量を負荷電流変化量により可変とし、負荷電流変化量が一定量以上あった場合には、単位時間当たりの周波数変化量を規定値よりも小さくすることで、周波数や位相の変化に敏感な装置（例えば、インバータ１３）が負荷１０に接続されている場合であっても、負荷１０に与える影響を最小限に抑えることができる。   As described above, according to the voltage sag compensator according to the present embodiment, the amount of change in synchronization frequency is variable according to the amount of change in load current, and when the amount of change in load current exceeds a certain amount, By making the frequency change amount of the signal smaller than the specified value, the influence on the load 10 is minimized even when a device (for example, the inverter 13) sensitive to the change in frequency and phase is connected to the load 10. To the limit.

また、本実施例に係る瞬低補償装置によれば、負荷電流変化量が設定値以下の場合には、周波数変化量を規定値よりも大きくすることで、同期合わせに要する時間を短縮することができるため、蓄電要素１５の容量を減らすことができる。また、従来の瞬低補償装置と蓄電要素１５の容量が同じ場合には、瞬低の補償時間を延ばすことができる。   Further, according to the voltage sag compensator according to the present embodiment, when the load current change amount is equal to or less than the set value, the time required for synchronization is shortened by making the frequency change amount larger than the specified value. Therefore, the capacity of the power storage element 15 can be reduced. In addition, when the capacity of the power storage element 15 is the same as that of the conventional voltage sag compensator, the voltage sag compensation time can be extended.

本発明は、例えば、瞬低時に無瞬断で負荷に電力を供給する瞬低補償装置、特に、復電時にインバータから系統へ切り換える際の、系統電圧とインバータ電圧との同期合わせ回路に利用することが可能である。   INDUSTRIAL APPLICABILITY The present invention is used, for example, in a voltage sag compensator that supplies power to a load without interruption during a power sag, and more particularly, to a circuit for synchronizing a system voltage and an inverter voltage when switching from an inverter to a system during power recovery It is possible.

本発明の第１の実施例に係る瞬低補償装置の同期合わせ回路を示した図である。It is the figure which showed the synchronizing circuit of the voltage drop compensation apparatus which concerns on 1st Example of this invention. 本発明の第１の実施例に係る瞬低補償装置の同期合わせ回路におけるリミッタ特性を示した図である。It is the figure which showed the limiter characteristic in the synchronizing circuit of the voltage drop compensation apparatus which concerns on 1st Example of this invention. 本発明の第１の実施例に係る瞬低補償装置の同期合わせの様子を示した図である。It is the figure which showed the mode of the synchronization alignment of the voltage drop compensation apparatus which concerns on 1st Example of this invention. 本発明の第２の実施例に係る瞬低補償装置の同期合わせ回路におけるリミッタ特性を示した図である。It is the figure which showed the limiter characteristic in the synchronizing circuit of the voltage drop compensation apparatus which concerns on 2nd Example of this invention. 本発明の第２の実施例に係る瞬低補償装置の同期合わせの様子を示した図である。It is the figure which showed the mode of the synchronization alignment of the voltage drop compensation apparatus which concerns on 2nd Example of this invention. 本発明の第２の実施例に係る瞬低補償装置の動作タイミングを示した図である。It is the figure which showed the operation | movement timing of the sag compensator which concerns on 2nd Example of this invention. 従来の瞬低補償装置のシステム構成を示した図である。It is the figure which showed the system configuration | structure of the conventional sag compensation apparatus. 従来の瞬低補償装置の動作タイミングを示した図である。It is the figure which showed the operation timing of the conventional sag compensation apparatus. 従来の瞬低補償装置の同期合わせ回路を示した図である。It is the figure which showed the synchronizing circuit of the conventional sag compensation apparatus.

符号の説明Explanation of symbols

１ 位相差検出部
２ 変化量検出部
３ リミッタ
４ 周波数生成部
１０ 負荷
１１ 電源
１２ 高速スイッチ
１３ インバータ
１４ 制御装置
１５ 蓄積要素 DESCRIPTION OF SYMBOLS 1 Phase difference detection part 2 Change amount detection part 3 Limiter 4 Frequency generation part 10 Load 11 Power supply 12 High speed switch 13 Inverter 14 Controller 15 Storage element

Claims (3)

電源により生ずる系統電圧とインバータにより生ずるインバータ電圧との位相差を検出する位相差検出部と、
負荷電流の変化量を負荷電流変化量として検出する変化量検出部と、
前記位相差と前記負荷電流変化量とに応じてリミット幅を変化させることで周波数変化量を変化させるリミッタと、
前記リミット幅とインバータ制御内部周波数とに応じてインバータ正弦波の周波数を生成する周波数生成部と
を備える
ことを特徴とする瞬低補償装置。 A phase difference detector for detecting a phase difference between a system voltage generated by a power source and an inverter voltage generated by an inverter;
A change amount detection unit that detects a change amount of the load current as a load current change amount;
A limiter that changes a frequency change amount by changing a limit width according to the phase difference and the load current change amount;
A voltage sag compensator comprising: a frequency generation unit that generates a frequency of an inverter sine wave according to the limit width and the inverter control internal frequency. 前記リミッタは、前記負荷電流変化量が設定値以上の場合に周波数変化量を小さくする
ことを特徴とする請求項１に記載の瞬低補償装置。 2. The voltage sag compensator according to claim 1, wherein the limiter reduces a frequency change amount when the load current change amount is a set value or more. 前記リミッタは、前記負荷電流変化量が設定値以下の場合に周波数変化量を大きくする
ことを特徴とする請求項１又は請求項２に記載の瞬低補償装置。 3. The voltage sag compensator according to claim 1, wherein the limiter increases a frequency change amount when the load current change amount is equal to or less than a set value.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011193704A (en) * 2010-03-17 2011-09-29 Meidensha Corp Dc-ac power converter
JP2017158222A (en) * 2016-02-29 2017-09-07 株式会社明電舎 Power conversion apparatus and turn-on method for circuit breaker for bypass
JP2018019596A (en) * 2016-07-28 2018-02-01 株式会社日立製作所 Method and system for synchronizing phase of electric signal in uninterruptible power supply system

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Publication number Priority date Publication date Assignee Title
JPS6212385A (en) * 1985-07-08 1987-01-21 Hitachi Ltd External signal synchronization type inverter
JP2001186690A (en) * 1999-12-27 2001-07-06 Shin Kobe Electric Mach Co Ltd Ac uninterruptible power supply device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6212385A (en) * 1985-07-08 1987-01-21 Hitachi Ltd External signal synchronization type inverter
JP2001186690A (en) * 1999-12-27 2001-07-06 Shin Kobe Electric Mach Co Ltd Ac uninterruptible power supply device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011193704A (en) * 2010-03-17 2011-09-29 Meidensha Corp Dc-ac power converter
JP2017158222A (en) * 2016-02-29 2017-09-07 株式会社明電舎 Power conversion apparatus and turn-on method for circuit breaker for bypass
JP2018019596A (en) * 2016-07-28 2018-02-01 株式会社日立製作所 Method and system for synchronizing phase of electric signal in uninterruptible power supply system

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