JP7347752B2 - uninterruptible power supply system - Google Patents

uninterruptible power supply system Download PDF

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JP7347752B2
JP7347752B2 JP2019122776A JP2019122776A JP7347752B2 JP 7347752 B2 JP7347752 B2 JP 7347752B2 JP 2019122776 A JP2019122776 A JP 2019122776A JP 2019122776 A JP2019122776 A JP 2019122776A JP 7347752 B2 JP7347752 B2 JP 7347752B2
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明 佐藤
康司 加藤
良介 齋藤
寿勝 五十嵐
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GS Yuasa International Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level

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Description

本発明は、無停電電源装置システムに関する。 The present invention relates to an uninterruptible power supply system.

無停電電源装置システムにおいて、システムの信頼性を向上させるために、複数の無停電電源装置を並列に接続して冗長運転させる方式が知られている（特許文献１）。 In an uninterruptible power supply system, in order to improve the reliability of the system, a method is known in which a plurality of uninterruptible power supplies are connected in parallel and operated redundantly (Patent Document 1).

図６は、特許文献１に記載された無停電電源装置システムの概略構成図である。図６において、複数の無停電電源装置（ＵＰＳ）１－１～１－３は、並列に接続され、入力側には交流電源２が接続され、出力側には負荷３が接続されている。 FIG. 6 is a schematic configuration diagram of an uninterruptible power supply system described in Patent Document 1. In FIG. 6, a plurality of uninterruptible power supplies (UPS) 1-1 to 1-3 are connected in parallel, an AC power source 2 is connected to the input side, and a load 3 is connected to the output side.

複数の無停電電源装置１－１～１－３は、交流電源２の交流を直流に変換するコンバータ１１－１～１１－３と、コンバータ１１－１～１１－３で変換された直流を交流に変換し変換された交流を負荷３に供給するインバータ１２－１～１２－３とで構成されている。 The plurality of uninterruptible power supplies 1-1 to 1-3 have converters 11-1 to 11-3 that convert the alternating current of the AC power supply 2 into direct current, and convert the direct current converted by the converters 11-1 to 11-3 into alternating current. It is composed of inverters 12-1 to 12-3 that convert the AC into AC and supply the converted AC to the load 3.

特許文献１では、図７に示すフローチャートに示すように、電力量合計が第１定格電力量合計よりも大きい場合に（ステップＳ５２のＹＥＳ）、インバータを起動する（ステップＳ５３）。電力量合計が第１定格電力量合計よりも小さい場合に（ステップＳ５２のＮＯ）、第２定格電力量合計が電力量合計よりも大きいかどうかを判定する（ステップＳ５４）。 In Patent Document 1, as shown in the flowchart shown in FIG. 7, when the total electric energy is larger than the first total rated electric energy (YES in step S52), the inverter is started (step S53). If the total power amount is smaller than the first total rated power amount (NO in step S52), it is determined whether the second total rated power amount is larger than the total power amount (step S54).

第２定格電力量合計が電力量合計よりも大きい場合に（ステップＳ５４のＹＥＳ）、インバータを停止する（ステップＳ５５）。このように、図７に示すフローチャートによって、無停電電源装置の運転制御を行い、システム全体の省エネを図っている。 When the second rated power total is larger than the power total (YES in step S54), the inverter is stopped (step S55). In this way, the operation of the uninterruptible power supply is controlled according to the flowchart shown in FIG. 7, and the energy saving of the entire system is achieved.

特許第５７３２１３４号公報Patent No. 5732134

しかしながら、無停電電源装置の負荷率に対する効率を効率カーブによっては、負荷の条件次第で、無停電電源装置が２台で運転するよりも、無停電電源装置が３台で運転した方がシステムとしての効率が上がる条件がある。 However, depending on the load conditions, it is better to operate three uninterruptible power supplies as a system than two. There are conditions for increasing efficiency.

効率カーブには、図８（ａ）に示すように、負荷率が大きくなるに従って効率が大きくなる効率カーブや図８（ｂ）に示すように、所定の負荷率で効率が最大となる効率カーブがある。図８（ｂ）に示す効率カーブの場合には、無停電電源装置が２台で運転するよりも、無停電電源装置が３台で運転した方がシステム効率が上がる。 The efficiency curve includes an efficiency curve in which the efficiency increases as the load factor increases, as shown in FIG. 8(a), and an efficiency curve in which the efficiency becomes maximum at a predetermined load factor, as shown in FIG. 8(b). There is. In the case of the efficiency curve shown in FIG. 8(b), the system efficiency is higher when three uninterruptible power supplies are operated than when two uninterruptible power supplies are operated.

本発明の課題は、システムの総損失電力が最小となる台数の無停電電源装置で運転することできる無停電電源装置システムを提供する。 An object of the present invention is to provide an uninterruptible power supply system that can be operated with a number of uninterruptible power supplies that minimizes the total power loss of the system.

上記課題を解決するために、本発明に係る無停電電源装置システムは、負荷に並列に接続され、前記負荷に電力を供給し、常用器Ｎ台及び予備器Ｍ台で構成される複数の無停電電源装置と、前記複数の無停電電源装置の運転・停止を制御する制御部と、前記複数の無停電電源装置に接続される蓄電池とを備え、前記無停電電源装置は、交流電源の交流電力を直流電力に変換するコンバータと、前記コンバータで変換された直流電力又は前記蓄電池からの直流電力を交流電力に変換して前記負荷に供給するインバータを備え、負荷が必要とする電力を実際に稼働する前記常用器と前記予備器の合計である稼働台数で供給し、且つ実際に稼働する常用器の台数を少なくとも１台以上で可変し、最も少ない総損失電力となる稼働台数で運転することを特徴とする。 In order to solve the above problems, an uninterruptible power supply system according to the present invention is provided with a plurality of uninterruptible power supply systems connected in parallel to a load, supplying power to the load, and configured with N regular units and M standby units. The uninterruptible power supply device includes an uninterruptible power supply device, a control unit that controls operation/stop of the plurality of uninterruptible power supply devices, and a storage battery connected to the plurality of uninterruptible power supply devices, and the uninterruptible power supply device It is equipped with a converter that converts electric power into DC power, and an inverter that converts the DC power converted by the converter or the DC power from the storage battery into AC power and supplies it to the load. Supplying the number of operating units that is the sum of the operating regular appliances and the backup units, and varying the number of actually operating regular appliances to at least one unit or more, and operating at the number of operating units that results in the least total power loss. It is characterized by

本発明によれば、常用器と予備器の合計である稼働台数で供給し、且つ実際に稼働する常用器の台数を少なくとも１台以上で可変し、最も少ない総損失電力となる稼働台数で運転する。従って、システムの総損失電力が最小となる台数の無停電電源装置で運転できる。 According to the present invention, the number of operating units that are the sum of the regular equipment and the standby equipment is supplied, and the number of regular equipment that is actually in operation is varied to at least one unit, and the number of operating units that results in the lowest total power loss is operated. do. Therefore, the system can be operated with the number of uninterruptible power supplies that minimize the total power loss.

本発明の第１の実施形態に係る無停電電源装置システムの構成ブロック図である。FIG. 1 is a configuration block diagram of an uninterruptible power supply system according to a first embodiment of the present invention. 本発明の第１の実施形態に係る無停電電源装置システムの制御部の処理を示すフローチャートである。It is a flowchart which shows the processing of the control part of the uninterruptible power supply system concerning the 1st embodiment of the present invention. 本発明の第２の実施形態に係る無停電電源装置システムの構成ブロック図である。FIG. 2 is a configuration block diagram of an uninterruptible power supply system according to a second embodiment of the present invention. 本発明の第２の実施形態に係る無停電電源装置システムの制御部の処理を示すフローチャートである。It is a flowchart which shows the processing of the control part of the uninterruptible power supply system concerning the 2nd embodiment of the present invention. 本発明の第３の実施形態に係る無停電電源装置システムの制御部の処理を示すフローチャートである。It is a flowchart which shows the processing of the control part of the uninterruptible power supply system concerning the 3rd embodiment of the present invention. 従来の無停電電源装置システムの構成を示す図である。1 is a diagram showing the configuration of a conventional uninterruptible power supply system. 図６に示す無停電電源装置システムの無停電電源装置の運転制御を示すフローチャートである。7 is a flowchart showing operation control of the uninterruptible power supply of the uninterruptible power supply system shown in FIG. 6; 無停電電源装置の負荷率に対する効率カーブの２つの例を示す図である。It is a figure which shows two examples of the efficiency curve with respect to the load factor of an uninterruptible power supply device.

以下、本発明の実施の形態に係る無停電電源装置について、図面を参照しながら詳細に説明する。 EMBODIMENT OF THE INVENTION Hereinafter, an uninterruptible power supply according to an embodiment of the present invention will be described in detail with reference to the drawings.

（第１の実施形態）
図１は、本発明の第１の実施形態に係る無停電電源装置システムの構成ブロック図である。図１に示す無停電電源装置システムは、複数の無停電電源装置１－１～１－３と、制御部１５と、蓄電池４とを備えている。複数の無停電電源装置は、３つに限定されることなく、４つ以上であっても良い。 (First embodiment)
FIG. 1 is a configuration block diagram of an uninterruptible power supply system according to a first embodiment of the present invention. The uninterruptible power supply system shown in FIG. 1 includes a plurality of uninterruptible power supplies 1-1 to 1-3, a control unit 15, and a storage battery 4. The number of uninterruptible power supplies is not limited to three, and may be four or more.

複数の無停電電源装置１－１～１－３は、並列に接続され、負荷３に電力を供給する。制御部１５は、複数の無停電電源装置１－１～１－３からの計測情報に基づき複数の無停電電源装置１－１～１－３の運転・停止を制御する。蓄電池４は、複数の無停電電源装置１－１～１－３に接続される。 The plurality of uninterruptible power supplies 1-1 to 1-3 are connected in parallel and supply power to the load 3. The control unit 15 controls operation/stop of the plurality of uninterruptible power supplies 1-1 to 1-3 based on measurement information from the plurality of uninterruptible power supplies 1-1 to 1-3. The storage battery 4 is connected to a plurality of uninterruptible power supplies 1-1 to 1-3.

複数の無停電電源装置１－１～１－３は、交流電源２の交流電力を直流電力に変換するコンバータ１１－１～１１－３と、コンバータ１１－１～１１－３で変換された直流電力又は蓄電池４からの直流電力を交流電力に変換して負荷３に供給するインバータ１２－１～１２－３を備えている。 The plurality of uninterruptible power supplies 1-1 to 1-3 include converters 11-1 to 11-3 that convert AC power from an AC power supply 2 to DC power, and DC power converted by the converters 11-1 to 11-3. It includes inverters 12-1 to 12-3 that convert electric power or DC power from the storage battery 4 into AC power and supply it to the load 3.

複数の無停電電源装置１－１～１－３は、負荷が必要とする電力を実際に稼働する常用器Ｎと予備器Ｍとの合計である稼働台数で供給し、且つ実際に稼働する常用器の台数を少なくとも１台以上で可変し、最も少ない総損失電力となる稼働台数で運転する。但し一般的には、予備器Ｍは通常１台から２台の固定とすることが多い。 The plurality of uninterruptible power supplies 1-1 to 1-3 supply the power required by the load in the number of units in operation, which is the total of the regular units N that are actually in operation and the standby units M, and The number of devices is varied to at least one, and operation is performed at the number of devices in operation that results in the least total power loss. However, in general, one to two spare units M are usually fixed.

制御部１５は、無停電電源装置の効率カーブ（負荷率に対する効率を表す変換効率）をテーブル化したものを記憶し、変換効率と給電電力と消費電力に基づきシステムの総損失電力を算出し、総損失電力に基づき無停電電源装置の運転制御を行う。このため、制御部１５は、メモリ２１と、総損失電力算出部２２と、総損失電力比較部２３と、運転台数制御部２４とを備えている。メモリ２１は、図８（ｂ）に示すような負荷率に対する効率を表す変換効率を記憶する。 The control unit 15 stores a table of the efficiency curve (conversion efficiency representing efficiency with respect to load factor) of the uninterruptible power supply, calculates the total power loss of the system based on the conversion efficiency, power supply, and power consumption, The operation of the uninterruptible power supply is controlled based on the total power loss. For this reason, the control section 15 includes a memory 21, a total power loss calculation section 22, a total power loss comparison section 23, and an operation number control section 24. The memory 21 stores conversion efficiency representing the efficiency with respect to the load factor as shown in FIG. 8(b).

総損失電力算出部２２は、メモリ２１に記憶された変換効率を読み出し、この変換効率と無停電電源装置１台当たりの給電電力と１台当たりの消費電力とに基づき、常用器Ｎと予備器Ｍとで構成される複数の無停電電源装置が稼働予定台数Ｌ台で負荷３に給電した場合のシステムの総損失電力を算出する。 The total loss power calculation unit 22 reads out the conversion efficiency stored in the memory 21, and calculates the power consumption of the regular unit N and the standby unit based on this conversion efficiency, the power supplied per uninterruptible power supply unit, and the power consumption per unit. The total power loss of the system is calculated when a plurality of uninterruptible power supplies configured by M supply power to the load 3 with L units scheduled to be operated.

総損失電力比較部２３は、総損失電力算出部２２で算出された稼働予定台数Ｌ台給電時の第１の総損失電力と、稼働予定台数Ｌ台を１台停止し稼働予定台数をＬ－１台とした時の給電時の第２の総損失電力とを比較する。 The total power loss comparison unit 23 calculates the first total power loss when power is supplied to the scheduled number of operating units L calculated by the total power loss calculation unit 22 and the number of scheduled operating units after stopping one unit of the scheduled operating number L. A comparison will be made with the second total power loss during power supply when one unit is used.

運転台数制御部２４は、第１の総損失電力が第２の総損失電力より高い時は稼働予定台数を１台減じて総損失電力算出部２２で総損失電力を算出し、第１の総損失電力が第２の総損失電力より低い時の台数を稼働台数Ｋに決定し、決定された稼働台数Ｋとなるように複数の無停電電源装置１－１～１－３を運転又は停止させる。 When the first total power loss is higher than the second total power loss, the operating unit number control unit 24 calculates the total power loss by subtracting the scheduled number of operating units by one, and calculates the total power loss by using the total power loss calculation unit 22. The number of uninterruptible power supplies 1-1 to 1-3 when the power loss is lower than the second total power loss is determined as the number of operating units K, and the plurality of uninterruptible power supplies 1-1 to 1-3 are operated or stopped so as to reach the determined number of operating units K. .

次に、このように構成された第１の実施形態に係る無停電電源装置システムの制御部１５の処理を図２に示すフローチャートを参照しながら詳細に説明する。 Next, the processing of the control unit 15 of the uninterruptible power supply system according to the first embodiment configured as described above will be described in detail with reference to the flowchart shown in FIG. 2.

ここでは、３台以上の無停電電源装置で構成される無停電電源装置システムにおいて、負荷電力が１台停止させてもインバータ給電可能な条件が成立した場合、以下の処理を行う。以下の例では、複数の無停電電源装置で構成される無停電電源装置システムを例示する。 Here, in an uninterruptible power supply system configured with three or more uninterruptible power supplies, if a condition is established that allows inverter power supply even if one load power is stopped, the following processing is performed. In the following example, an uninterruptible power supply system configured with a plurality of uninterruptible power supplies is illustrated.

まず、所定の台数の無停電電源装置を起動する（ステップＳ１１）。この時負荷の容量が不明のときは最大台数を起動する。次に、制御部１５は、以下の計算式（１）に従って、実システム容量を算出する。以下の説明では予備器はＭ台とする。 First, a predetermined number of uninterruptible power supplies are activated (step S11). At this time, if the load capacity is unknown, the maximum number of units will be activated. Next, the control unit 15 calculates the actual system capacity according to the following calculation formula (1). In the following explanation, it is assumed that there are M spare units.

実システム容量＝システム容量×（稼働台数－予備器Ｍ）／（常用無停電電源装置台数）
システム容量＝無停電電源装置容量×常用無停電電源装置台数 …（１）
即ち、制御部１５は、実システム容量＝無停電電源装置容量×（稼働台数－予備器Ｍ）を算出する（ステップＳ１２）。 Actual system capacity = System capacity x (Number of operating units - Spare units M) / (Number of regular uninterruptible power supplies)
System capacity = uninterruptible power supply capacity x number of regular uninterruptible power supply units…(1)
That is, the control unit 15 calculates actual system capacity=uninterruptible power supply capacity×(number of operating units−backup unit M) (step S12).

制御部１５は、実システム容量が実負荷容量よりも大きいかどうかを判定する（ステップＳ１３）。実システム容量が実負荷容量よりも大きい場合には（ステップＳ１３のＹＥＳ）、総損失電力算出部２２は、メモリ２１から読み出した変換効率と無停電電源装置１台当たりの給電電力と１台当たりの消費電力とに基づき、常用器Ｎと予備器Ｍとで構成される複数の無停電電源装置が稼働予定台数Ｌ台で負荷３に給電した場合のシステムの総損失電力を算出する（ステップＳ１４）。 The control unit 15 determines whether the actual system capacity is larger than the actual load capacity (step S13). If the actual system capacity is larger than the actual load capacity (YES in step S13), the total power loss calculation unit 22 calculates the conversion efficiency read from the memory 21, the power supplied per uninterruptible power supply, and the power per uninterruptible power supply. The total power loss of the system is calculated based on the power consumption of the load 3 when a plurality of uninterruptible power supplies consisting of the regular unit N and the standby unit M supply power to the load 3 with L units scheduled to operate (step S14). ).

具体的には、総損失電力算出部２２は、以下に示す計算式（２）により無停電電源装置１台当たりの給電電力を算出する。 Specifically, the total power loss calculation unit 22 calculates the power to be supplied per uninterruptible power supply using the calculation formula (2) shown below.

２台で給電した場合、１台当たりの給電電力Ｐout２＝Ｐload／２
（Ｌ－１）台で給電した場合、１台当たりの給電電力
ＰoutＬ－１＝Ｐload／（Ｌ－１）
Ｌ台で給電した場合、１台当たりの給電電力
Ｐout Ｌ ＝Ｐload／Ｌ …（２）
ここで、Ｐloadは負荷電力である。 When two units supply power, the power supplied per unit Pout 2 = Pload/2
When power is supplied from (L-1) units, the power supplied per unit Pout L-1 = Pload/(L-1)
When power is supplied from L units, the power supplied per unit Pout L = Pload/L … (2)
Here, Pload is load power.

次に、総損失電力算出部２２は、以下に示す計算式（３）により無停電電源装置１台当たりの消費電力を算出する。 Next, the total loss power calculation unit 22 calculates the power consumption per uninterruptible power supply device using calculation formula (3) shown below.

２台で給電した場合、１台当たりの消費電力
Ｐloss２＝（（１／η）－１）×Ｐout２
（Ｌ－１）台で給電した場合、１台当たりの消費電力
Ｐloss(Ｌ－１)＝（（１／η）－１）×Ｐout(Ｌ－１)
Ｌ台で給電した場合、１台当たりの消費電力
ＰlossＬ＝（（１／η）－１）×ＰoutＬ …（３）
ここで、ηは、予め測定された情報で、メモリ２１に記憶されたＰoutでの変換効率である。 When power is supplied by two units, power consumption per unit Ploss 2 = ((1/η)-1) × Pout 2
When power is supplied from (L-1) units, power consumption per unit Ploss (L-1) = ((1/η)-1) × Pout (L-1)
When power is supplied from L units, power consumption per unit Ploss L = ((1/η)-1) × Pout L … (3)
Here, η is information measured in advance and is the conversion efficiency at Pout stored in the memory 21.

次に、総損失電力算出部２２は、以下に示す計算式（４）によりシステムの総損失電力を算出する。 Next, the total power loss calculation unit 22 calculates the total power loss of the system using the calculation formula (4) shown below.

２台で給電した場合のシステムの総損失電力
Ｐlossall２＝Ｐloss２×２
（Ｌ－１）台で給電した場合のシステムの総損失電力
Ｐlossall(Ｌ－１)＝Ｐloss (Ｌ－１) ×（Ｌ－１）
Ｌ台で給電した場合のシステムの総損失電力
ＰlossallＬ＝ＰlossＬ ×Ｌ …（４） Total power loss of the system when power is supplied by two units Plossall 2 = Ploss 2 × 2
Total power loss of the system when power is supplied by (L-1) units Plossall (L-1) = Ploss (L-1) × (L-1)
Total power loss of the system when power is supplied by L units Plossall L = Ploss L × L … (4)

次に、総損失電力比較部２３は、総損失電力算出部２２で算出されたＬ台給電時の総損失電力と（Ｌ－１）台給電時の総損失電力とを比較する（ステップＳ１５）。Ｌ台給電時の総損失電力が（Ｌ－１）台給電時の総損失電力よりも小さい場合には（ステップＳ１５のＹＥＳ）、複数の無停電電源装置を稼働台数Ｋに決定する（ステップＳ１７）。 Next, the total power loss comparator 23 compares the total power loss when feeding L units calculated by the total power loss calculation unit 22 with the total power loss when feeding (L-1) units (step S15). . If the total power loss when powering L units is smaller than the total power loss when powering (L-1) units (YES in step S15), the number of operating units of a plurality of uninterruptible power supplies is determined to be K (step S17). ).

一方、Ｌ台給電時の総損失電力が（Ｌ－１）台給電時の総損失電力よりも大きい場合には稼働台数を減らして総損失電力が小さくなる可能性が有る。そこで、ステップＳ１５のＮＯの場合は、稼働予定台数Ｌ台を１台減らし（ステップＳ１６）、再びステップＳ１４及びステップＳ１５にて、Ｌ台給電時の総損失電力とＬ－１）台給電時の総損失電力を比較する。Ｌ台給電時の総損失電力が（Ｌ－１）台給電時の総損失電力よりも小さくなるか、又は常用器が稼働する台数が１台になるまでステップＳ１４、ステップＳ１５、ステップＳ１６を繰り返し、稼働台数Ｋを決定する。 On the other hand, if the total power loss when feeding L units is larger than the total power loss when feeding (L-1) units, there is a possibility that the number of operating units may be reduced to reduce the total power loss. Therefore, in the case of NO in step S15, the scheduled number of operating units L is reduced by one (step S16), and in step S14 and step S15 again, the total power loss when powering L units and the total power loss when powering L-1) units are calculated. Compare the total power loss. Repeat steps S14, S15, and S16 until the total power loss when powering L units becomes smaller than the total power loss when powering (L-1) units, or the number of regular appliances in operation becomes one. , determine the number of operating machines K.

このように、運転台数制御部２４は、Ｌ台給電時の総損失電力が（Ｌ－１）台給電時の総損失電力よりも小さくなったときのＬ台を稼働台数Ｋに決定し（ステップＳ１７）、決定された稼働台数Ｋとなるように複数の無停電電源装置を運転又は停止させる（ステップＳ１８）。 In this way, the operating number control unit 24 determines L units as the operating number K when the total power loss when L units are being powered is smaller than the total power loss when (L-1) units are being powered (step S17), the plurality of uninterruptible power supplies are operated or stopped so that the determined number of operating units K is reached (step S18).

従って、システムの総損失電力が最小となる台数の無停電電源装置で運転できる。このため、システムの効率を向上することができる。 Therefore, the system can be operated with the number of uninterruptible power supplies that minimize the total power loss. Therefore, the efficiency of the system can be improved.

なお、ステップＳ１３において、実システム容量が実負荷容量よりも小さい場合には、全ての無停電電源装置を運転する（ステップＳ１９）。 Note that in step S13, if the actual system capacity is smaller than the actual load capacity, all uninterruptible power supplies are operated (step S19).

なお、上記第１の実施の形態では、制御部１５は、複数の無停電電源装置１－１～１－３を停止させる場合、コンバータ１１－１～１１－３とインバータ１２－１～１２－３を停止させたが、例えば、インバータ１２－１～１２－３のみを停止させてよい。 Note that in the first embodiment, when stopping the plurality of uninterruptible power supplies 1-1 to 1-3, the control unit 15 stops the converters 11-1 to 11-3 and the inverters 12-1 to 12-. Although inverters 12-1 to 12-3 are stopped, for example, only inverters 12-1 to 12-3 may be stopped.

（第２の実施形態）
図３は、本発明の第２の実施形態に係る無停電電源装置システムの構成ブロック図である。第２の実施形態に係る無停電電源装置システムにおいて、図３に示す制御部１５ａが、図１に示す制御部１５の構成にさらに、カウンタ２５と、時間判定部２６とを備える点が異なる。 (Second embodiment)
FIG. 3 is a configuration block diagram of an uninterruptible power supply system according to a second embodiment of the present invention. In the uninterruptible power supply system according to the second embodiment, the control section 15a shown in FIG. 3 differs from the configuration of the control section 15 shown in FIG. 1 in that it further includes a counter 25 and a time determination section 26.

カウンタ２５は、稼働台数Ｋ台の無停電電源装置が決定されると、時間をカウントする。時間判定部２６は、カウンタ２５でカウントされた時間が指定時間を超えたかどうかを判定し、カウントされた時間が指定時間を超えた場合には、総損失電力算出部２２に対して総損失を算出させる。 The counter 25 counts time when the operating number K of uninterruptible power supply devices is determined. The time determination unit 26 determines whether or not the time counted by the counter 25 exceeds the specified time, and if the counted time exceeds the specified time, the time determination unit 26 reports the total loss to the total power loss calculation unit 22. Have it calculated.

次に、このように構成された第２の実施形態に係る無停電電源装置システムの制御部１５ａの処理を図４に示すフローチャートを参照しながら詳細に説明する。 Next, the processing of the control unit 15a of the uninterruptible power supply system according to the second embodiment configured as described above will be described in detail with reference to the flowchart shown in FIG.

ステップＳ１２～Ｓ１８の処理は、図２に示すステップＳ１２～Ｓ１８の処理と同じであるので、ここでは、ステップＳ２１～Ｓ２４の処理のみを説明する。 Since the processing in steps S12 to S18 is the same as the processing in steps S12 to S18 shown in FIG. 2, only the processing in steps S21 to S24 will be described here.

まず、所定の台数の無停電電源装置を起動する（ステップＳ２１）。次に、制御部１５ａは、稼働台数Ｋ台の無停電電源装置の給電電力が現負荷に給電できるかどうかを判定する（ステップＳ２２）。 First, a predetermined number of uninterruptible power supplies are activated (step S21). Next, the control unit 15a determines whether the power supplied by the operating number K of uninterruptible power supplies can be supplied to the current load (step S22).

稼働台数Ｋ台の無停電電源装置の給電電力が現負荷に給電できる場合には（ステップＳ２２のＹＥＳ）、カウンタ２５は、時間をカウントする（ステップＳ２３）。 When the power supplied by the operating number K of uninterruptible power supplies can be supplied to the current load (YES in step S22), the counter 25 counts the time (step S23).

次に、時間判定部２６は、カウンタ２５でカウントされた時間が指定時間を超えたかどうかを判定する（ステップＳ２４）。カウントされた時間が指定時間を超えた場合には（ステップＳ２４のＹＥＳ）、ステップＳ１２の処理に進む。即ち、総損失電力算出部２２が総損失電力を算出する。 Next, the time determination unit 26 determines whether the time counted by the counter 25 exceeds the designated time (step S24). If the counted time exceeds the specified time (YES in step S24), the process proceeds to step S12. That is, the total power loss calculation unit 22 calculates the total power loss.

カウントされた時間が指定時間を超えない場合には（ステップＳ２４のＮＯ）、ステップＳ２１の処理に戻る。また、ステップＳ２２において、稼働台数Ｋ台の無停電電源装置の給電電力で現負荷に給電できない場合には（ステップＳ２２のＮＯ）、全ての無停電電源装置を運転させる（ステップＳ２５）。 If the counted time does not exceed the specified time (NO in step S24), the process returns to step S21. Further, in step S22, if the current load cannot be supplied with the power supplied by the operating number K of uninterruptible power supplies (NO in step S22), all the uninterruptible power supplies are operated (step S25).

このように第２の実施形態に係る無停電電源装置システムによれば、指定時間毎に、ステップＳ１２における実システム容量の算出、ステップＳ１４におけるシステムの総損失電力を算出するので、現状の負荷の状態に応じて、システムの総損失電力が最小となる台数の無停電電源装置で運転できる。このため、システムの効率を向上することができる。 As described above, according to the uninterruptible power supply system according to the second embodiment, the actual system capacity is calculated in step S12 and the total power loss of the system is calculated in step S14 at each specified time, so that the current load can be calculated. Depending on the situation, the system can be operated with the number of uninterruptible power supplies that minimize the total power loss. Therefore, the efficiency of the system can be improved.

（第３の実施形態）
図５は、本発明の第３の実施形態に係る無停電電源装置システムの制御部の処理を示すフローチャートである。第３の実施形態に係る無停電電源装置システムは、第２の実施形態に係る無停電電源装置システムの図４に示すフローチャートに、さらに、ステップＳ２２とステップＳ２３との間に、ステップＳ２６の処理を追加した点が異なる。 (Third embodiment)
FIG. 5 is a flowchart showing the processing of the control unit of the uninterruptible power supply system according to the third embodiment of the present invention. The uninterruptible power supply system according to the third embodiment further includes the processing of step S26 between step S22 and step S23 in addition to the flowchart shown in FIG. 4 of the uninterruptible power supply system according to the second embodiment. The difference is that .

ここでは、ステップＳ２６の処理のみを説明する。現在時刻の負荷電力と現在時刻よりも所定時間前、例えば１秒前の負荷電力とを比較する（ステップＳ２６）。現在時刻の負荷電力と現在時刻よりも１秒前の負荷電力とが同一値である場合には（ステップＳ２６のＹＥＳ）、ステップＳ２３の処理に進む。 Here, only the process of step S26 will be explained. The load power at the current time is compared with the load power at a predetermined time before, for example, one second before the current time (step S26). If the load power at the current time and the load power 1 second before the current time are the same value (YES in step S26), the process proceeds to step S23.

一方、現在時刻の負荷電力と現在時刻よりも１秒前の負荷電力とが同一値でない場合には（ステップＳ２６のＮＯ）、ステップＳ２１の処理に戻る。 On the other hand, if the load power at the current time and the load power 1 second before the current time are not the same value (NO in step S26), the process returns to step S21.

このように第３の実施形態に係る無停電電源装置システムによれば、現在時刻の負荷電力と現在時刻よりも１秒前の負荷電力とが同一値でない場合には、負荷の急変により、負荷電力が変化した場合に、無停電電源装置の稼働台数を適切に変更することができる。１秒前は、負荷電力が変化したことを検出できれば、使用条件に応じて時間を任意に変更しても良い。 As described above, according to the uninterruptible power supply system according to the third embodiment, if the load power at the current time and the load power 1 second before the current time are not the same value, the load When the power changes, the number of operating uninterruptible power supplies can be changed appropriately. As long as it is possible to detect that the load power has changed, the time may be changed arbitrarily depending on the usage conditions.

なお、本発明は、第１乃至第３の実施形態に係る無停電電源装置システムに限定されるものではない。第１乃至第３の実施形態に係る無停電電源装置システムにおいて、制御部１５，１５ａは、各無停電電源装置の稼働時間を計算し、稼働時間が最も長い無停電電源装置を停止候補順位を第１順位とする。図２、図４、図５において、無停電電源装置を停止する条件が成立した場合、稼働時間が最も長い無停電電源装置を停止させてもよい。 Note that the present invention is not limited to the uninterruptible power supply system according to the first to third embodiments. In the uninterruptible power supply system according to the first to third embodiments, the control units 15, 15a calculate the operating time of each uninterruptible power supply, and rank the uninterruptible power supply with the longest operating time as a candidate for shutdown. Ranked first. In FIGS. 2, 4, and 5, when the conditions for stopping the uninterruptible power supply are satisfied, the uninterruptible power supply having the longest operating time may be stopped.

１－１～１－３ 無停電電源装置（ＵＰＳ）
２ 交流電源
３ 負荷
４ 蓄電池
１１－１～１１－３ コンバータ
１２－１～１２－３ インバータ
２１ メモリ
２２ 総損失電力算出部
２３ 総損失電力比較部
２４ 運転台数制御部
２５ カウンタ
２６ 時間判定部









1-1 to 1-3 Uninterruptible power supply (UPS)
2 AC power supply 3 Load 4 Storage batteries 11-1 to 11-3 Converters 12-1 to 12-3 Inverter 21 Memory 22 Total loss power calculation unit 23 Total loss power comparison unit 24 Operating unit number control unit 25 Counter 26 Time determination unit

Claims (7)

負荷に並列に接続され、前記負荷に電力を供給し、常用器Ｎ台及び予備器Ｍ台で構成される複数の無停電電源装置と、
前記複数の無停電電源装置の運転・停止を制御する制御部と、
前記複数の無停電電源装置に接続される蓄電池と
を備え、
前記無停電電源装置は、
交流電源の交流電力を直流電力に変換するコンバータと、
前記コンバータで変換された直流電力又は前記蓄電池からの直流電力を交流電力に変換して前記負荷に供給するインバータ
を備え、
前記無停電電源装置は、前記負荷が必要とする電力を実際に稼働する前記常用器と前記予備器の合計である稼働台数で供給し、且つ実際に稼働する常用器の台数を少なくとも１台以上で総損失電力に基づいて可変し、最も少ない総損失電力となる稼働台数で運転する
無停電電源装置システム。 a plurality of uninterruptible power supply devices connected in parallel to a load, supplying power to the load, and configured with N regular devices and M standby devices;
a control unit that controls operation/stop of the plurality of uninterruptible power supplies;
and a storage battery connected to the plurality of uninterruptible power supply devices,
The uninterruptible power supply device includes:
A converter that converts AC power from an AC power source into DC power,
an inverter that converts the DC power converted by the converter or the DC power from the storage battery into AC power and supplies it to the load;
The uninterruptible power supply supplies the power required by the load with the number of operating units being the total of the regular operating units and the backup units, and the number of operating units actually operating is at least one or more. variable based on the total power loss , and operate at the number of operating units that results in the lowest total power loss.
Uninterruptible power supply system. 前記制御部は、
負荷率に対する効率を表す変換効率に基づき、前記複数の無停電電源装置が稼働予定台数Ｌ台で前記負荷に給電した場合のシステムの総損失電力を算出する総損失電力算出部と、
前記総損失電力算出部で算出された稼働予定台数Ｌ台での給電時の第１の総損失電力と、稼働予定台数Ｌ台を１台停止し稼働予定台数をＬ－１台とした時の給電時の第２の総損失電力とを比較する総損失電力比較部と、
第１の総損失電力が第２の総損失電力より高い時は稼働予定台数を１台減じて前記総損失電力算出部で総損失電力を算出し、第１の総損失電力が第２の総損失電力より低い時の台数を稼働台数Ｋに決定し、決定された稼働台数Ｋとなるように前記複数の無停電電源装置を運転又は停止させる運転台数制御部と
を備える
請求項１記載の無停電電源装置システム。 The control unit includes:
a total power loss calculation unit that calculates the total power loss of the system when L units of the plurality of uninterruptible power supplies are scheduled to operate and supply power to the load based on conversion efficiency representing efficiency with respect to load factor;
The first total power loss during power supply with L units scheduled to operate, calculated by the total power loss calculation unit, and when one of the L units scheduled to operate is stopped and the number of units scheduled to operate is set to L-1 units. a total power loss comparison unit that compares the total power loss with the second total power loss during power supply;
When the first total power loss is higher than the second total power loss, the total power loss calculation unit calculates the total power loss by subtracting one unit from the number of units scheduled to operate, and the first total power loss is equal to the second total power loss. an operation number control unit that determines the number of units in operation when the power is lower than the power loss as the number of units in operation K, and operates or stops the plurality of uninterruptible power supplies so that the number of units in operation is the determined number of units in operation K.
The uninterruptible power supply system according to claim 1. 負荷に並列に接続され、前記負荷に電力を供給し、常用器Ｎ台及び予備器Ｍ台で構成される複数の無停電電源装置と、 a plurality of uninterruptible power supply devices connected in parallel to a load, supplying power to the load, and configured with N regular devices and M standby devices;
前記複数の無停電電源装置の運転・停止を制御する制御部と、 a control unit that controls operation/stop of the plurality of uninterruptible power supplies;
前記複数の無停電電源装置に接続される蓄電池と a storage battery connected to the plurality of uninterruptible power supply devices;
を備え、Equipped with
前記無停電電源装置は、 The uninterruptible power supply device includes:
交流電源の交流電力を直流電力に変換するコンバータと、 A converter that converts AC power from an AC power source into DC power,
前記コンバータで変換された直流電力又は前記蓄電池からの直流電力を交流電力に変換して前記負荷に供給するインバータと an inverter that converts the DC power converted by the converter or the DC power from the storage battery into AC power and supplies the AC power to the load;
を備え、Equipped with
前記無停電電源装置は、前記負荷が必要とする電力を実際に稼働する前記常用器と前記予備器の合計である稼働台数で供給し、且つ実際に稼働する常用器の台数を少なくとも１台以上で可変し、最も少ない総損失電力となる稼働台数で運転し、 The uninterruptible power supply supplies the power required by the load with the number of operating units being the total of the regular operating units and the backup units, and the number of operating units actually operating is at least one or more. The number of units in operation is varied to ensure the lowest total power loss.
前記制御部は、 The control unit includes:
負荷率に対する効率を表す変換効率に基づき、前記複数の無停電電源装置が稼働予定台数Ｌ台で前記負荷に給電した場合のシステムの総損失電力を算出する総損失電力算出部と、 a total power loss calculation unit that calculates the total power loss of the system when L units of the plurality of uninterruptible power supplies are scheduled to operate and supply power to the load based on conversion efficiency representing efficiency with respect to load factor;
前記総損失電力算出部で算出された稼働予定台数Ｌ台での給電時の第１の総損失電力と、稼働予定台数Ｌ台を１台停止し稼働予定台数をＬ－１台とした時の給電時の第２の総損失電力とを比較する総損失電力比較部と、 The first total power loss during power supply with L units scheduled to operate, calculated by the total power loss calculation unit, and when one of the L units scheduled to operate is stopped and the number of units scheduled to operate is set to L-1 units. a total power loss comparison unit that compares the total power loss with the second total power loss during power supply;
第１の総損失電力が第２の総損失電力より高い時は稼働予定台数を１台減じて前記総損失電力算出部で総損失電力を算出し、第１の総損失電力が第２の総損失電力より低い時の台数を稼働台数Ｋに決定し、決定された稼働台数Ｋとなるように前記複数の無停電電源装置を運転又は停止させる運転台数制御部と When the first total power loss is higher than the second total power loss, the total power loss calculation unit calculates the total power loss by subtracting one unit from the number of units scheduled to operate, and the first total power loss is equal to the second total power loss. an operation number control unit that determines the number of units in operation when the power loss is lower than the power loss as the number of units in operation K, and operates or stops the plurality of uninterruptible power supplies so as to reach the determined number of units in operation K;
を備えるequipped with
無停電電源装置システム。Uninterruptible power supply system. 前記総損失電力算出部は、前記無停電電源装置１台当たりの給電電力と１台当たりの消費電力と前記変換効率とに基づき、稼働予定台数Ｌで前記負荷に給電した場合のシステムの総損失電力を算出する請求項２または３記載の無停電電源装置システム。 The total loss power calculation unit calculates the total loss of the system when power is supplied to the load with the scheduled number of operating units L, based on the power supplied per unit of the uninterruptible power supply, the power consumption per unit, and the conversion efficiency. The uninterruptible power supply system according to claim 2 or 3, wherein the uninterruptible power supply system calculates electric power. 前記制御部は、
稼働台数Ｋ台が決定すると、時間をカウントするカウンタと、
前記カウンタでカウントされた時間が指定時間を超えたかどうかを判定し、カウントされた時間が指定時間を超えた場合には、前記総損失電力算出部に対して総損失を算出させる時間判定部と、
を備える
請求項２乃至４のいずれか１項記載の無停電電源装置システム。 The control unit includes:
When the number of operating units K is determined, a counter that counts the time,
a time determination unit that determines whether or not the time counted by the counter exceeds a specified time, and causes the total loss power calculation unit to calculate the total loss if the counted time exceeds the specified time; ,
equipped with
The uninterruptible power supply system according to any one of claims 2 to 4 . 前記制御部は、現在時刻の第１負荷電力と前記現在時刻よりも所定時間前の第２負荷電力とを比較し、前記第１負荷電力と前記第２負荷電力とが同一値である場合には、前記カウンタに対して時間をカウントさせる請求項５記載の無停電電源装置システム。 The control unit compares the first load power at the current time and the second load power at a predetermined time before the current time, and when the first load power and the second load power are the same value, The uninterruptible power supply system according to claim 5, wherein the counter causes the counter to count time. 前記制御部は、前記複数の無停電電源装置を停止させる場合に、前記インバータのみを停止させる請求項１乃至６のいずれか１項記載の無停電電源装置システム。 7. The uninterruptible power supply system according to claim 1, wherein the control unit stops only the inverter when stopping the plurality of uninterruptible power supplies.
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