JP7729364B2 - Uninterruptible Power Supply System - Google Patents
Uninterruptible Power Supply SystemInfo
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- JP7729364B2 JP7729364B2 JP2023138905A JP2023138905A JP7729364B2 JP 7729364 B2 JP7729364 B2 JP 7729364B2 JP 2023138905 A JP2023138905 A JP 2023138905A JP 2023138905 A JP2023138905 A JP 2023138905A JP 7729364 B2 JP7729364 B2 JP 7729364B2
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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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 uninterruptible power supply systems, a method is known in which multiple uninterruptible power supplies are connected in parallel for redundant operation in order to improve system reliability (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。 Figure 6 is a schematic diagram of the uninterruptible power supply system described in Patent Document 1. In Figure 6, multiple uninterruptible power supplies (UPS) 1-1 to 1-3 are connected in parallel, with an AC power supply 2 connected to the input side and a load 3 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 multiple uninterruptible power supplies 1-1 to 1-3 are composed of converters 11-1 to 11-3 that convert AC from the AC power source 2 into DC, and inverters 12-1 to 12-3 that convert the DC converted by the converters 11-1 to 11-3 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 in Figure 7, if the total amount of electric energy is greater than the first rated total amount of electric energy (YES in step S52), the inverter is started (step S53). If the total amount of electric energy is less than the first rated total amount of electric energy (NO in step S52), it is determined whether the second rated total amount of electric energy is greater than the total amount of electric energy (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。 If the second rated total power amount is greater than the total power amount (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 Figure 7, thereby achieving energy conservation throughout the system.
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 efficiency curve of the uninterruptible power supply's load factor, and depending on the load conditions, there are conditions in which operating three uninterruptible power supplies will result in higher system efficiency than operating two uninterruptible power supplies.
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。 There are efficiency curves such as those shown in Figure 8(a) where efficiency increases as the load rate increases, and those shown in Figure 8(b) where efficiency is maximized at a certain load rate. In the case of the efficiency curve shown in Figure 8(b), system efficiency is higher when three uninterruptible power supplies are operated than when two 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。 The objective of the present invention is to provide an uninterruptible power supply system that can be operated with the 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。 To solve the above problems, the uninterruptible power supply system of the present invention comprises multiple uninterruptible power supplies, each consisting of N regular units and M spare units, connected in parallel to a load and supplying power to the load; a control unit that controls the operation and shutdown of the multiple uninterruptible power supplies; and storage batteries connected to the multiple uninterruptible power supplies. The uninterruptible power supplies each comprise a converter that converts AC power from an AC power source into DC power, and an inverter that converts the DC power converted by the converter or the DC power from the storage batteries into AC power and supplies it to the load. The power required by the load is supplied by the number of operating units, which is the sum of the regular units and spare units that are actually operating, and the number of regular units that are actually operating can be varied by at least one unit, and the system is operated with the number of operating units that results in the smallest total power loss.
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, power is supplied by the number of operating units, which is the sum of the regular and spare units, and the number of regular units actually in operation is variable by at least one, so that the system operates with the number of operating units that results in the smallest total power loss. Therefore, the system can be operated with the number of uninterruptible power supplies that minimizes the total power loss.
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。 Below, 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 supply devices 1-1 to 1-3, a control unit 15, and a storage battery 4. The number of the plurality of uninterruptible power supply devices 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。 Multiple uninterruptible power supplies 1-1 to 1-3 are connected in parallel and supply power to a load 3. A control unit 15 controls the operation and shutdown of the multiple uninterruptible power supplies 1-1 to 1-3 based on measurement information from the multiple uninterruptible power supplies 1-1 to 1-3. A storage battery 4 is connected to the multiple 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 multiple uninterruptible power supplies 1-1 to 1-3 are equipped with converters 11-1 to 11-3 that convert AC power from the AC power source 2 into DC power, and inverters 12-1 to 12-3 that convert the DC power converted by the converters 11-1 to 11-3 or the 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。 Multiple uninterruptible power supplies 1-1 to 1-3 supply the power required by the load with the number of operating units, which is the sum of the regular units N that are actually in operation and the spare units M. The number of regular units that are actually in operation can be varied by at least one unit, and they are operated with the number of operating units that results in the smallest total power loss. However, the number of spare units M is generally fixed at one or two units.
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 uninterruptible power supply's efficiency curve (conversion efficiency representing efficiency versus load factor), calculates the total power loss of the system based on the conversion efficiency, power supply power, and power consumption, and controls the operation of the uninterruptible power supply based on the total power loss. To this end, the control unit 15 includes a memory 21, a total power loss calculation unit 22, a total power loss comparison unit 23, and an operating unit number control unit 24. The memory 21 stores conversion efficiencies representing efficiency versus load factor, as shown in Figure 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 power loss calculation unit 22 reads the conversion efficiency stored in memory 21, and calculates the total power loss of the system when multiple uninterruptible power supplies, consisting of N regular units and M spare units, with a planned number L of units in operation, supply power to the load 3 based on this conversion efficiency, the power supply per uninterruptible power supply unit, and the power consumption per unit.
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 compares the first total power loss calculated by the total power loss calculation unit 22 when power is supplied to L planned operating units with the second total power loss when power is supplied when one of the L planned operating units is stopped, leaving L-1 planned operating units.
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 subtracts one from the number of units scheduled to be in operation and calculates the total power loss using the total power loss calculation unit 22. When the first total power loss is lower than the second total power loss, the operating unit number K is determined, and the multiple uninterruptible power supplies 1-1 to 1-3 are operated or stopped so that the determined operating unit number K is reached.
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 Figure 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 consisting of three or more uninterruptible power supplies, if the conditions are met that allow the inverter to supply power even if one of the load power supplies stops, the following processing is performed. The following example illustrates an uninterruptible power supply system consisting of multiple uninterruptible power supplies.
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 started (step S11). If the load capacity is unknown at this time, the maximum number of units is started. 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 × (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 supplies ... (1)
That is, the control unit 15 calculates: actual system capacity=uninterruptible power supply capacity×(number of operating units−standby units 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 greater than the actual load capacity (step S13). If the actual system capacity is greater than the actual load capacity (YES in step S13), the total power loss calculation unit 22 calculates the total power loss of the system when multiple uninterruptible power supplies, consisting of N regular units and M spare units, with a planned number L of units in operation, supply power to the load 3, based on the conversion efficiency, the power supply power per uninterruptible power supply unit, and the power consumption per unit read from memory 21 (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 supply per uninterruptible power supply unit using the following formula (2):
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
ＰoutＬ＝Ｐload／Ｌ …（２）
ここで、Ｐloadは負荷電力である。
When two units are used for power supply, the power supply per unit is Pout 2 = Pload/2
When power is supplied to (L-1) units, the power supply per unit Pout L-1 = Pload/(L-1)
When power is supplied to L units, the power supply per unit Pout L = Pload/L (2)
where Pload is the 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 power loss calculation unit 22 calculates the power consumption per uninterruptible power supply unit using the following formula (3):
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 two units are used for power supply, the power consumption per unit is Ploss 2 = ((1/η) - 1) x Pout 2
When power is supplied to (L-1) units, the power consumption per unit is Ploss (L-1) = ((1/η)-1) × Pout (L-1)
When power is supplied to L units, the power consumption per unit is Ploss L = ((1/η) - 1) × Pout L ... (3)
Here, η is the conversion efficiency at Pout that is previously measured information and 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 following formula (4):
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 powered 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 comparison unit 23 compares the total power loss when powering L units and the total power loss when powering (L-1) units, calculated by the total power loss calculation unit 22 (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 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 powering L units is greater than the total power loss when powering (L-1) units, it is possible to reduce the number of operating units and thereby reduce the total power loss. Therefore, if the answer is NO in step S15, the planned number of operating units, L, is reduced by one (step S16), and again in steps S14 and S15, the total power loss when powering L units is compared with the total power loss when powering (L-1) units. Steps S14, S15, and S16 are repeated until the total power loss when powering L units is less than the total power loss when powering (L-1) units, or until the number of operating regular units is reduced to one, and the number of operating units, K, is determined.
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 unit number control unit 24 determines the number of operating units K to be L units when the total power loss when powering L units becomes smaller than the total power loss when powering (L-1) units (step S17), and operates or stops multiple uninterruptible power supplies 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。 As a result, the system can be operated with the number of uninterruptible power supplies that minimizes the total power loss, thereby improving system efficiency.
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）。 If, in step S13, 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。 In the first embodiment described above, when stopping multiple 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 12-3. However, it may also be possible to stop only the inverters 12-1 to 12-3, for example.
（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 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, a control unit 15a shown in Fig. 3 is different from the control unit 15 shown in Fig. 1 in that it further includes a counter 25 and a time determination unit 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。 When the number of operating uninterruptible power supplies, K, is determined, the counter 25 counts time. The time determination unit 26 determines whether the time counted by the counter 25 exceeds a specified time, and if the counted time exceeds the specified time, causes the total power loss calculation unit 22 to calculate the total loss.
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 Figure 4.
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。 The processing in steps S12 to S18 is the same as that in steps S12 to S18 shown in Figure 2, so only the processing in steps S21 to S24 will be explained 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 started (step S21). Next, the control unit 15a determines whether the power supply capacity of the K operating uninterruptible power supplies is sufficient to supply power 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）。 If the power supply capacity of the K operating uninterruptible power supplies is sufficient to power 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 has exceeded the specified time (step S24). If the counted time has exceeded 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. Also, if in step S22 the power supply power of the K operating uninterruptible power supplies is not enough to power the current load (NO in step S22), all 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, the uninterruptible power supply system according to the second embodiment calculates the actual system capacity in step S12 and the total system power loss in step S14 at each specified time. This allows operation with the number of uninterruptible power supplies that minimizes the total system power loss depending on the current load state. This improves system efficiency.
（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)
5 is a flowchart showing the processing of the control unit of an uninterruptible power supply system according to a third embodiment of the present invention. The uninterruptible power supply system according to the third embodiment differs from the flowchart of the uninterruptible power supply system according to the second embodiment shown in FIG. 4 in that the processing of step S26 is added between steps S22 and S23.
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 processing of step S26 will be explained. The load power at the current time is compared with the load power a predetermined time before the current time, for example, one second before (step S26). If the load power at the current time and the load power one second before the current time are the same value (YES in step S26), the processing 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 one second prior to the current time are not the same value (NO in step S26), processing 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, with the uninterruptible power supply system according to the third embodiment, if the load power at the current time and the load power one second prior to the current time are not the same value, the number of operating uninterruptible power supplies can be appropriately changed if the load power changes due to a sudden change in load. As long as it is possible to detect a change in the load power one second prior, the time can be changed arbitrarily depending on the conditions of use.
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 systems of the first to third embodiments. In the uninterruptible power supply systems of the first to third embodiments, the control units 15, 15a calculate the operating time of each uninterruptible power supply and assign the uninterruptible power supply with the longest operating time the first priority in the order of candidates for shutdown. In Figures 2, 4, and 5, when the conditions for shutting down the uninterruptible power supplies are met, the uninterruptible power supply with the longest operating time may be shut down.
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 battery 11-1 to 11-3 Converters 12-1 to 12-3 Inverter 21 Memory 22 Total power loss calculation unit 23 Total power loss comparison unit 24 Control unit for controlling the number of operating units 25 Counter 26 Time determination unit
Claims (7)
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、
前記複数の無停電電源装置の各々は、
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と
を備え、
前記制御部は、稼働する前記複数の無停電電源装置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台数で運転するように制御する、
無停電電源装置システム。 a plurality of uninterruptible power supplies connected in parallel to a load to supply power to the load;
a control unit that controls operation and shutdown of the plurality of uninterruptible power supplies;
a storage battery connected to the plurality of uninterruptible power supply devices;
Each of the plurality of uninterruptible power supplies
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 the AC power to the load,
The control unit controls the number of the plurality of uninterruptible power supply devices to be operated to be at least one or more, based on the total power loss, and controls the number of devices to be operated so as to minimize the total power loss.
Uninterruptible Power Supply Systems.
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、
前記複数の無停電電源装置の各々は、
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と
を備え、
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、
前記制御部は、稼働する前記複数の無停電電源装置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台数で運転するように制御する、
無停電電源装置システム。 a plurality of uninterruptible power supplies connected in parallel to a load to supply power to the load;
a control unit that controls operation and shutdown of the plurality of uninterruptible power supplies;
a storage battery connected to the plurality of uninterruptible power supply devices;
Each of the plurality of uninterruptible power supplies
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 the AC power to the load,
The control unit
a total power loss calculation unit that calculates a total power loss of the system when the plurality of uninterruptible power supplies, the number of which is L and is planned to be in operation, supplies power to the load based on a conversion efficiency that indicates efficiency with respect to a load factor;
a first total power loss when power is supplied to the L number of units scheduled to operate, calculated by the total power loss calculation unit; and
a total power loss comparison unit that compares the second total power loss during power supply when one of the L number of scheduled operating units is stopped and the number of scheduled operating units is set to L-1;
a control unit for controlling the number of operating units to operate or stop the plurality of uninterruptible power supplies so that the determined number of operating units K is reached; and
The control unit controls the number of the plurality of uninterruptible power supply devices to be operated to be at least one or more, based on the total power loss, and controls the number of devices to be operated so as to minimize the total power loss.
Uninterruptible Power Supply Systems.
請求項２記載の無停電電源装置システム。 3. The uninterruptible power supply system according to claim 2, wherein the total power loss calculation unit calculates the total power loss of the system when power is supplied to the load with the number of units L planned to be in operation, based on the power supply power per uninterruptible power supply unit, the power consumption per unit, and the conversion efficiency.
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又は請求項３記載の無停電電源装置システム。 The control unit
When the number of operating units (K) is determined, a counter that counts the time is set.
a time determination unit that determines whether the time counted by the counter has exceeded a designated time, and, if the counted time has exceeded the designated time, causes the total power loss calculation unit to calculate a total loss;
4. The uninterruptible power supply system according to claim 2, further comprising:
請求項４記載の無停電電源装置システム。 5. The uninterruptible power supply system according to claim 4, wherein the control unit compares the first load power at the current time with the second load power a predetermined time before the current time, and if the first load power and the second load power are the same value, causes the counter to count time.
請求項１記載の無停電電源装置システム。 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.
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 and shutdown 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
前記複数の無停電電源装置の各々は、Each of the plurality of uninterruptible power supplies
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
前記制御部は、The control unit
稼働する前記複数の無停電電源装置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台数で運転し、The number of the plurality of uninterruptible power supply units in operation is varied based on the total power loss to at least one unit, and the number of units that results in the smallest total power loss is operated;
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するように制御する、When the plurality of uninterruptible power supply devices are to be stopped, control is performed so that only the inverter is stopped.
無停電電源装置システム。Uninterruptible Power Supply Systems.
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| WO2011033820A1 (en) | 2009-09-16 | 2011-03-24 | 東芝三菱電機産業システム株式会社 | Power conversion system and uninterruptible power source system |
| JP2017189071A (en) | 2016-04-08 | 2017-10-12 | 東芝三菱電機産業システム株式会社 | Power conversion system |
| JP2018153076A (en) | 2017-02-13 | 2018-09-27 | ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ | Power distribution control in modular converter system using efficiency calculation |
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| JP2010166654A (en) * | 2009-01-14 | 2010-07-29 | Toshiba Mitsubishi-Electric Industrial System Corp | Uninterruptible power supply device |
| WO2012169046A1 (en) * | 2011-06-09 | 2012-12-13 | 東芝三菱電機産業システム株式会社 | Uninterruptible power supply system |
| JP2013223402A (en) * | 2012-04-19 | 2013-10-28 | Hitachi Ltd | Uninterruptible power supply system |
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| WO2011033820A1 (en) | 2009-09-16 | 2011-03-24 | 東芝三菱電機産業システム株式会社 | Power conversion system and uninterruptible power source system |
| JP2017189071A (en) | 2016-04-08 | 2017-10-12 | 東芝三菱電機産業システム株式会社 | Power conversion system |
| JP2018153076A (en) | 2017-02-13 | 2018-09-27 | ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ | Power distribution control in modular converter system using efficiency calculation |
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