JP2009106101A - Synchronous control device of power supply and parallel operation method of power supply - Google Patents

Synchronous control device of power supply and parallel operation method of power supply Download PDF

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JP2009106101A
JP2009106101A JP2007276556A JP2007276556A JP2009106101A JP 2009106101 A JP2009106101 A JP 2009106101A JP 2007276556 A JP2007276556 A JP 2007276556A JP 2007276556 A JP2007276556 A JP 2007276556A JP 2009106101 A JP2009106101 A JP 2009106101A
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power supply
output voltage
phase difference
period
commercial power
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JP5029285B2 (en
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Yoshihiko Yamagata
義彦 山方
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Fuji Electric Co Ltd
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Fuji Electric Systems Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To quickly remove a phase difference between the output voltage of a power supply and that of a commercial power source, with no abrupt change of cycle of the output voltage of power supply. <P>SOLUTION: When a phase difference judging means 13 detects an initial phase difference θ<SB>0</SB>between an output voltage of a power supply 11 and that of an AC power source 1, a cycle shift amount control means 14 gradually increases a cycle shift amount (T-T<SB>0</SB>) from cycle T<SB>0</SB>of the output voltage of the AC power source 1 until a phase difference θ between the output voltage of power supply 11 and that of the AC power source 1 comes to be θ<SB>0</SB>/2, and gradually decreases the cycle shift amount (T-T<SB>0</SB>) from the cycle T<SB>0</SB>of the output voltage of AC power source 1 until the phase difference θ from the output voltage of AC power source 1 comes to be zero. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は電源装置の同期制御装置および電源装置の並列運転方法に関し、特に、商用電源と同期をとりながら運転される電源装置の出力電圧と商用電源の出力電圧との間の位相差を補正する方法に適用して好適なものである。   The present invention relates to a synchronous control device for a power supply device and a parallel operation method for the power supply device, and in particular, corrects a phase difference between the output voltage of the power supply device operated while synchronizing with the commercial power supply and the output voltage of the commercial power supply. It is suitable for application to a method.

商用電源と同期をとりながら運転される常時商用型無停電電源装置では、電源装置の出力電圧と商用電源の出力電圧との間の位相差θが発生すると、電源装置の出力電圧の周期Ｔと商用電源の出力電圧の周期Ｔ0とをずらすことで、電源装置の出力電圧と商用電源の出力電圧との間の位相差θをゼロに収束させることが行われている（特許文献１）。
図３は、従来の電源装置の同期制御方法を示すフローチャートである。 In a continuous commercial uninterruptible power supply that is operated in synchronization with a commercial power supply, if a phase difference θ between the output voltage of the power supply and the output voltage of the commercial power supply occurs, the period T of the output voltage of the power supply By shifting the period T 0 of the output voltage of the commercial power supply, the phase difference θ between the output voltage of the power supply apparatus and the output voltage of the commercial power supply is converged to zero (Patent Document 1).
FIG. 3 is a flowchart showing a conventional synchronization control method for a power supply apparatus.

図３において、電源装置の出力電圧の周期Ｔが商用電源の出力電圧の周期Ｔ0に一致している状態で（ステップＳ１１）、電源装置の出力電圧と商用電源の出力電圧との間に位相差θが発生すると、電源装置の出力電圧の周期Ｔを商用電源の出力電圧の周期Ｔ0から周期ずらし分ΔＴだけずらす（ステップＳ１２）。
そして、電源装置の出力電圧の周期Ｔが商用電源の出力電圧の周期Ｔ0から周期ずらし分ΔＴだけずらされると、電源装置の出力電圧と商用電源の出力電圧との間の位相差θが変化し、その位相差θはゼロに収束する（ステップＳ１３）。そして、電源装置の出力電圧と商用電源の出力電圧との間の位相差θがゼロに収束すると、電源装置の出力電圧の周期Ｔを商用電源の出力電圧の周期Ｔ0に一致させることで（ステップＳ１４）、商用電源と同期をとりながら電源装置を運転することができる。
特開平２−２４１３３５号公報 In FIG. 3, in a state in which the cycle T of the output voltage of the power supply device coincides with the cycle T 0 of the output voltage of the commercial power supply (step S11), it is between the output voltage of the power supply device and the output voltage of the commercial power supply. When the phase difference θ occurs, the period T of the output voltage of the power supply device is shifted by a period shift ΔT from the period T 0 of the output voltage of the commercial power supply (step S12).
When the cycle T of the output voltage of the power supply device is shifted from the cycle T 0 of the output voltage of the commercial power supply by the period shift ΔT, the phase difference θ between the output voltage of the power supply device and the output voltage of the commercial power supply changes. The phase difference θ converges to zero (step S13). When the phase difference θ between the output voltage of the power supply device and the output voltage of the commercial power supply converges to zero, the cycle T of the output voltage of the power supply device matches the cycle T 0 of the output voltage of the commercial power supply ( Step S14), the power supply device can be operated while synchronizing with the commercial power supply.
JP-A-2-241335

しかしながら、図３の電源装置の同期制御方法では、周期ずらし分ΔＴを大きくすると、電源装置の出力電圧と商用電源の出力電圧との間の位相差θを短時間でゼロに収束させることができるが、電源装置の出力電圧の周期Ｔが急激に変化する。このため、図４に示すように、交流電源１と負荷４との間に複数の電源装置２、３が並列接続されていると、電源装置２、３間に横流が流れ、電源装置２、３の動作が不安定化するという問題があった。   However, in the synchronous control method of the power supply apparatus of FIG. 3, when the period shift ΔT is increased, the phase difference θ between the output voltage of the power supply apparatus and the output voltage of the commercial power supply can be converged to zero in a short time. However, the cycle T of the output voltage of the power supply device changes abruptly. Therefore, as shown in FIG. 4, when a plurality of power supply devices 2 and 3 are connected in parallel between the AC power supply 1 and the load 4, a cross current flows between the power supply devices 2 and 3. There was a problem that the operation of 3 became unstable.

一方、図３の電源装置の同期制御方法において、周期ずらし分ΔＴを小さくすると、電源装置の出力電圧の周期Ｔが急激に変化するのを防止することができるが、電源装置の出力電圧と商用電源の出力電圧との間の位相差θがなかなかゼロにならないため、電源装置の出力電圧の周期Ｔが商用電源の出力電圧の周期Ｔ0に一致するまでに時間がかかる。このため、図５に示すように、常時商用型無停電電源装置において、停電復帰の際にスイッチ５をインバータ６側から交流電源１側に切り替える場合、同期合わせ期間中は蓄電池７から出力される直流をインバータ６にて交流に変換してから負荷４に電力を供給する必要があることから、その間に蓄電池７の充電量がゼロになり、負荷４への電力の供給が停止するという問題があった。
そこで、本発明の目的は、電源装置の出力電圧の周期を急激に変化させることなく、電源装置の出力電圧と商用電源の出力電圧との間の位相差を短時間にゼロにすることが可能な電源装置の同期制御装置および電源装置の並列運転方法を提供することである。 On the other hand, in the synchronous control method of the power supply apparatus of FIG. 3, if the period shift ΔT is made small, it is possible to prevent the output voltage period T of the power supply apparatus from changing suddenly. Since the phase difference θ with respect to the output voltage of the power supply does not readily become zero, it takes time until the cycle T of the output voltage of the power supply apparatus matches the cycle T 0 of the output voltage of the commercial power supply. For this reason, as shown in FIG. 5, in the always-on commercial uninterruptible power supply, when the switch 5 is switched from the inverter 6 side to the AC power source 1 side at the time of power failure recovery, it is output from the storage battery 7 during the synchronization period. Since it is necessary to supply power to the load 4 after the direct current is converted into alternating current by the inverter 6, the charge amount of the storage battery 7 becomes zero during that time, and the supply of power to the load 4 is stopped. there were.
Therefore, an object of the present invention is to make it possible to zero the phase difference between the output voltage of the power supply device and the output voltage of the commercial power supply in a short time without abruptly changing the cycle of the output voltage of the power supply device. It is providing the synchronous control apparatus of a power supply device, and the parallel operation method of a power supply device.

上述した課題を解決するために、請求項１記載の電源装置の同期制御装置によれば、商用電源の出力電圧との間の位相差を判定する位相差判定手段と、前記商用電源の出力電圧との間の位相差に基づいて、商用電源の出力電圧の周期からの周期ずらし分を制御する周期ずらし分制御手段とを備えることを特徴とする。
また、請求項２記載の電源装置の同期制御装置によれば、前記周期ずらし分制御手段は、商用電源の出力電圧の周期からの周期ずらし分を徐々に増加させてから徐々に減少させることにより、前記商用電源の出力電圧との間の位相差をゼロにすることを特徴とする。 In order to solve the above-described problem, according to the synchronous control device for a power supply device according to claim 1, phase difference determination means for determining a phase difference from an output voltage of a commercial power supply, and an output voltage of the commercial power supply And a period shift control means for controlling a period shift from the period of the output voltage of the commercial power supply based on the phase difference between the output and the commercial power supply.
According to the synchronous control device for a power supply apparatus according to claim 2, the period shift control means gradually increases the period shift from the period of the output voltage of the commercial power supply and then gradually decreases it. The phase difference from the output voltage of the commercial power supply is made zero.

また、請求項３記載の電源装置の並列運転方法によれば、商用電源と同期をとりながら運転される複数の電源装置から負荷に電力を供給する電源装置の並列運転方法において、前記電源装置の出力電圧と前記商用電源の出力電圧との間に位相差が発生した場合、前記商用電源の出力電圧の周期からの周期ずらし分を徐々に増加させてから徐々に減少させることにより、前記商用電源の出力電圧との間の位相差をゼロにすることを特徴とする。   According to the parallel operation method of the power supply device according to claim 3, in the parallel operation method of the power supply device that supplies power to the load from a plurality of power supply devices that are operated in synchronization with the commercial power supply, When a phase difference occurs between the output voltage and the output voltage of the commercial power supply, the commercial power supply is gradually decreased after gradually increasing the period shift from the cycle of the output voltage of the commercial power supply. The phase difference with respect to the output voltage is zero.

以上説明したように、本発明によれば、商用電源の出力電圧との間の位相差に基づいて商用電源の出力電圧の周期からの周期ずらし分を制御することで、商用電源の出力電圧の周期からの周期ずらし分を徐々に増加させることができる。このため、電源装置の出力電圧の周期を急激に変化させることなく、電源装置の出力電圧と商用電源の出力電圧との間の位相差を短時間にゼロにすることが可能となり、電源装置が並列運転される場合においても、電源装置の動作が不安定化するのを防止することが可能となるとともに、常時商用型無停電電源装置の蓄電池の消耗量を低減することができ、負荷への電力の供給が停止されるのを防止することが可能となる。   As described above, according to the present invention, by controlling the period shift from the cycle of the output voltage of the commercial power supply based on the phase difference from the output voltage of the commercial power supply, the output voltage of the commercial power supply is controlled. The period shift from the period can be gradually increased. For this reason, the phase difference between the output voltage of the power supply device and the output voltage of the commercial power supply can be zero in a short time without abruptly changing the cycle of the output voltage of the power supply device. Even in parallel operation, it becomes possible to prevent the operation of the power supply device from becoming unstable, and the consumption amount of the storage battery of the commercial uninterruptible power supply device can be reduced at all times. It is possible to prevent the power supply from being stopped.

以下、本発明の実施形態に係る電源装置の同期制御装置について図面を参照しながら説明する。
図１（ａ）は、本発明の一実施形態に係る同期制御装置が適用される電源装置の概略構成を示すブロック図、図１（ｂ）は、電源装置の出力電圧と商用電源の出力電圧との間の位相差θと、電源装置の出力電圧の周期Ｔと商用電源の出力電圧の周期Ｔ0との間の周期ずらし分との関係を示す図である。 Hereinafter, a synchronous control device for a power supply device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1A is a block diagram showing a schematic configuration of a power supply device to which a synchronous control device according to an embodiment of the present invention is applied, and FIG. 1B is an output voltage of a power supply device and an output voltage of a commercial power supply. Is a diagram showing the relationship between the phase difference θ between the power supply unit and the period shift between the output voltage period T of the power supply apparatus and the commercial power supply output voltage period T 0 .

図１（ａ）において、電源装置１１は、交流電源１と負荷４との間に接続され、電源装置１１には、交流電源１との間の同期制御を行う同期制御装置１２が設けられている。そして、同期制御装置１２には、交流電源１の出力電圧との間の位相差θを判定する位相差判定手段１３および交流電源１の出力電圧との間の位相差θに基づいて、交流電源１の出力電圧の周期Ｔ0からの周期ずらし分を制御する周期ずらし分制御手段１４が設けられている。 In FIG. 1A, a power supply device 11 is connected between an AC power supply 1 and a load 4, and the power supply device 11 is provided with a synchronization control device 12 that performs synchronization control with the AC power supply 1. Yes. The synchronization control device 12 includes an AC power supply based on the phase difference determination means 13 for determining the phase difference θ between the output voltage of the AC power supply 1 and the phase difference θ between the output voltage of the AC power supply 1. Period shift amount control means 14 for controlling the period shift amount of the output voltage 1 from the period T 0 is provided.

そして、図１（ｂ）に示すように、位相差判定手段１３は、電源装置１１の出力電圧と交流電源１の出力電圧との間の初期位相差θ0を検出すると、周期ずらし分制御手段１４は、電源装置１１の出力電圧と交流電源１の出力電圧との間の位相差θがθ0／２になるまで、交流電源１の出力電圧の周期Ｔ0からの周期ずらし分（Ｔ−Ｔ0）を徐々に増加させてから、交流電源１の出力電圧との間の位相差θがゼロになるまで、交流電源１の出力電圧の周期Ｔ0からの周期ずらし分（Ｔ−Ｔ0）を徐々に減少させることができる。 Then, as shown in FIG. 1B, the phase difference determination means 13 detects the initial phase difference θ 0 between the output voltage of the power supply device 11 and the output voltage of the AC power supply 1, and thereby controls the amount of period shift. 14, until the phase difference between the output voltage and the output voltage of the AC power supply 1 power supply 11 theta is theta 0/2, the period shift amount from the period T 0 of the output voltage of the AC power supply 1 (T- The period shift from the period T 0 of the output voltage of the AC power supply 1 (T−T 0) until the phase difference θ with respect to the output voltage of the AC power supply 1 becomes zero after gradually increasing T 0 ). ) Can be gradually reduced.

これにより、電源装置１１の出力電圧の周期Ｔを急激に変化させることなく、電源装置１１の出力電圧と交流電源１の出力電圧との間の位相差θを短時間にゼロにすることが可能となり、電源装置１１が並列運転される場合においても、電源装置１１の動作が不安定化するのを防止することが可能となるとともに、常時商用型無停電電源装置の蓄電池の消耗量を低減することができ、負荷４への電力の供給が停止されるのを防止することが可能となる。   Thus, the phase difference θ between the output voltage of the power supply device 11 and the output voltage of the AC power supply 1 can be zeroed in a short time without rapidly changing the cycle T of the output voltage of the power supply device 11. Thus, even when the power supply device 11 is operated in parallel, it becomes possible to prevent the operation of the power supply device 11 from becoming unstable, and to reduce the consumption amount of the storage battery of the always-on commercial uninterruptible power supply device. It is possible to prevent the supply of power to the load 4 from being stopped.

図２は、本発明の一実施形態に係る電源装置の同期制御方法を示すフローチャートである。
図２において、電源装置１１の出力電圧の周期Ｔが交流電源１の出力電圧の周期Ｔ0に一致している状態で、電源装置１１の出力電圧と交流電源１の出力電圧との間に初期位相差θ0が発生すると（ステップＳ１）、電源装置１１の出力電圧と交流電源１の出力電圧との間の位相差θがθ0／２になるまで、交流電源１の出力電圧の周期Ｔ0からの周期ずらし分（Ｔ−Ｔ0）を変化量ΔＴｃずつ段階的に増加させる（ステップＳ２、Ｓ４）。 FIG. 2 is a flowchart illustrating a synchronization control method for a power supply device according to an embodiment of the present invention.
In FIG. 2, the initial period between the output voltage of the power supply device 11 and the output voltage of the AC power supply 1 in the state where the cycle T of the output voltage of the power supply device 11 coincides with the cycle T 0 of the output voltage of the AC power supply 1. When the phase difference theta 0 is generated (step S1), the until the phase difference between the output voltage and the output voltage of the AC power supply 1 power supply 11 theta becomes θ 0/2, the period T of the output voltage of the AC power supply 1 The period shift from 0 (T−T 0 ) is increased step by step by a change amount ΔTc (steps S2 and S4).

なお、周期ずらし分（Ｔ−Ｔ0）の変化量ΔＴｃおよび周期ずらし分（Ｔ−Ｔ0）を変化させる間隔は、電源装置１１の出力電圧の周期Ｔが変化しても、電源装置１１からの出力の安定性が保てるように設定することができる。
そして、電源装置１１の出力電圧と交流電源１の出力電圧との間の位相差θがθ0／２以下になると、交流電源１の出力電圧との間の位相差θがゼロになるまで、交流電源１の出力電圧の周期Ｔ0からの周期ずらし分（Ｔ−Ｔ0）を変化量ΔＴｃずつ段階的に減少させることで、電源装置１１の出力電圧の周期Ｔを交流電源１の出力電圧の周期Ｔ0に一致させる（ステップＳ３、Ｓ５）。 The period shift amount variation ΔTc and spacing to vary the cycle shift amount (T-T 0) of the (T-T 0), even if the period T of the output voltage of the power supply device 11 is changed from the power supply device 11 Can be set to maintain the stability of the output.
When the phase difference θ between the output voltage of the power supply device 11 and the output voltage of the AC power supply 1 becomes θ 0/2 or less, until the phase difference θ between the output voltage of the AC power supply 1 becomes zero, The period shift (T−T 0 ) from the period T 0 of the output voltage of the AC power supply 1 is decreased step by step by a change amount ΔTc, so that the period T of the output voltage of the power supply 11 is changed to the output voltage of the AC power supply 1. To coincide with the period T 0 of (step S3, S5).

ここで、周期ずらし分（Ｔ−Ｔ0）を変化量ΔＴｃずつ段階的に増加させたり減少させたりすることで、電源装置１１の出力電圧の周期Ｔが急激に変化するのを防止することが可能となるとともに、電源装置１１の出力電圧と交流電源１の出力電圧との間の位相差θがθ0／２の近辺にある時には、周期ずらし分（Ｔ−Ｔ0）を大きくすることができ、電源装置１１の出力電圧と交流電源１の出力電圧との間の位相差θを短時間にゼロにすることができる。 Here, the period T of the output voltage of the power supply device 11 can be prevented from changing suddenly by increasing or decreasing the period shift (T−T 0 ) step by step by the change amount ΔTc. possible and with made, when the phase difference between the output voltage and the output voltage of the AC power supply 1 power supply 11 theta is in the vicinity of the theta 0/2, it possible to increase the cycle shift amount (T-T 0) The phase difference θ between the output voltage of the power supply device 11 and the output voltage of the AC power supply 1 can be zeroed in a short time.

図１（ａ）は、本発明の一実施形態に係る同期制御装置が適用される電源装置の概略構成を示すブロック図、図１（ｂ）は、電源装置の出力電圧と商用電源の出力電圧との間の位相差θと、電源装置の出力電圧の周期Ｔと商用電源の出力電圧の周期Ｔ0との間の周期ずらし分との関係を示す図である。FIG. 1A is a block diagram showing a schematic configuration of a power supply device to which a synchronous control device according to an embodiment of the present invention is applied, and FIG. 1B is an output voltage of a power supply device and an output voltage of a commercial power supply. Is a diagram showing the relationship between the phase difference θ between the power supply unit and the period shift between the output voltage period T of the power supply apparatus and the commercial power supply output voltage period T 0 . 本発明の一実施形態に係る電源装置の同期制御方法を示すフローチャートである。It is a flowchart which shows the synchronous control method of the power supply device which concerns on one Embodiment of this invention. 従来の電源装置の同期制御方法を示すフローチャートである。It is a flowchart which shows the synchronous control method of the conventional power supply device. 電源装置の並列運転方法を示すブロック図である。It is a block diagram which shows the parallel operation method of a power supply device. 常時商用型無停電電源装置の概略構成を示すブロック図である。It is a block diagram which shows schematic structure of a constant commercial uninterruptible power supply.

符号の説明Explanation of symbols

１ 交流電源
４ 負荷
１１ 電源装置
１２ 同期制御装置
１３ 位相差判定手段
１４ 周期ずらし分制御手段 DESCRIPTION OF SYMBOLS 1 AC power supply 4 Load 11 Power supply device 12 Synchronous control device 13 Phase difference determination means 14 Period shift part control means

Claims (3)

商用電源の出力電圧との間の位相差を判定する位相差判定手段と、
前記商用電源の出力電圧との間の位相差に基づいて、商用電源の出力電圧の周期からの周期ずらし分を制御する周期ずらし分制御手段とを備えることを特徴とする電源装置の同期制御装置。 A phase difference determining means for determining a phase difference between the output voltage of the commercial power supply and
A synchronization control device for a power supply apparatus, comprising: a period shift control unit that controls a period shift from a period of the output voltage of the commercial power supply based on a phase difference from the output voltage of the commercial power supply. . 前記周期ずらし分制御手段は、商用電源の出力電圧の周期からの周期ずらし分を徐々に増加させてから徐々に減少させることにより、前記商用電源の出力電圧との間の位相差をゼロにすることを特徴とする請求項１記載の電源装置の同期制御装置。   The period shift control means makes the phase difference from the output voltage of the commercial power supply zero by gradually increasing the period shift from the period of the output voltage of the commercial power supply and then gradually decreasing it. The synchronous control device for a power supply device according to claim 1. 商用電源と同期をとりながら運転される複数の電源装置から負荷に電力を供給する電源装置の並列運転方法において、
前記電源装置の出力電圧と前記商用電源の出力電圧との間に位相差が発生した場合、前記商用電源の出力電圧の周期からの周期ずらし分を徐々に増加させてから徐々に減少させることにより、前記商用電源の出力電圧との間の位相差をゼロにすることを特徴とする電源装置の並列運転方法。 In a parallel operation method of a power supply device that supplies power to a load from a plurality of power supply devices operated while synchronizing with a commercial power supply,
When a phase difference occurs between the output voltage of the power supply device and the output voltage of the commercial power supply, gradually increasing the period shift from the period of the output voltage of the commercial power supply and then gradually decreasing it. The parallel operation method of the power supply apparatus characterized by making a phase difference between the output voltage of the said commercial power supply zero.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870048U (en) * 1981-10-30 1983-05-12 新神戸電機株式会社 Synchronous adjustment circuit
JPH05328639A (en) * 1992-05-13 1993-12-10 Yuasa Corp Controller for uninterruptible power source unit
JP2000358379A (en) * 1999-06-14 2000-12-26 Sanyo Electric Works Ltd Uninterruptible power supply apparatus
JP2005033890A (en) * 2003-07-10 2005-02-03 Fuji Electric Systems Co Ltd Control method and control circuit of uninterruptible power supply system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870048U (en) * 1981-10-30 1983-05-12 新神戸電機株式会社 Synchronous adjustment circuit
JPH05328639A (en) * 1992-05-13 1993-12-10 Yuasa Corp Controller for uninterruptible power source unit
JP2000358379A (en) * 1999-06-14 2000-12-26 Sanyo Electric Works Ltd Uninterruptible power supply apparatus
JP2005033890A (en) * 2003-07-10 2005-02-03 Fuji Electric Systems Co Ltd Control method and control circuit of uninterruptible power supply system

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