JP2003259566A - Ac power supply system - Google Patents
Ac power supply systemInfo
- Publication number
- JP2003259566A JP2003259566A JP2002059466A JP2002059466A JP2003259566A JP 2003259566 A JP2003259566 A JP 2003259566A JP 2002059466 A JP2002059466 A JP 2002059466A JP 2002059466 A JP2002059466 A JP 2002059466A JP 2003259566 A JP2003259566 A JP 2003259566A
- Authority
- JP
- Japan
- Prior art keywords
- power
- load
- output
- power supply
- storage battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は負荷に交流電源を供
給する交流電源供給システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC power supply system for supplying AC power to a load.
【０００２】[0002]
【従来の技術】無停電の電力供給を要求する通信用、コ
ンピュータ用等の負荷に対しては、図５に示すような商
用電源が停電した場合にも負荷に安定に電力供給を行う
交流電源装置が備えられている。2. Description of the Related Art For a communication load, a computer load, etc. that requires uninterrupted power supply, an AC power supply that stably supplies power to the load even when a commercial power supply as shown in FIG. 5 fails. A device is provided.
【０００３】図５において、交流電源装置１２’は、商
用電源１０と、商用電源１０の交流出力を安定した所定
のレベルの交流電力に変換し、負荷２０に出力する。交
流電源装置１２’は、商用電源１０の交流出力を直流電
力に変換するコンバータ１２１と、蓄電池１２２と、商
用電源１の交流出力を直流電力に変換して蓄電池１２２
を充電する充電器１２３と、コンバータ１２１の直流電
力または蓄電池１２２の蓄電池出力を安定した交流電力
に変換し、負荷２０に出力するインバータ１２４と、特
定の期間以外に蓄電池１２２における充放電を停止させ
るためのダイオード１２５とを有している。In FIG. 5, an AC power supply device 12 'converts a commercial power supply 10 and an AC output of the commercial power supply 10 into stable AC power of a predetermined level, and outputs the AC power to a load 20. The AC power supply device 12 ′ includes a converter 121 that converts the AC output of the commercial power supply 10 into DC power, a storage battery 122, and a storage battery 122 that converts the AC output of the commercial power supply 1 into DC power.
A charger 123 for charging the battery, an inverter 124 for converting the DC power of the converter 121 or the output of the storage battery of the storage battery 122 into stable AC power, and outputting the AC power to the load 20, and charging / discharging of the storage battery 122 except for a specific period. And a diode 125 for
【０００４】交流電源装置１２’は、商用電源１０が正
常動作時にはコンバータ１２１は商用電源１０の交流出
力を安定な直流電力に変換すると共にインバータ１２４
を介して負荷２０へ電力供給を行う。また、商用電源１
０の交流出力を充電器１２３にて安定な直流電力に変換
して蓄電池１２２を充電する。さらに、商用電源１０停
電時には、インバータ１２４は蓄電池１２２出力を安定
な電力に変換して負荷２０に供給する。In the AC power supply device 12 ', the converter 121 converts the AC output of the commercial power supply 10 into stable DC power and the inverter 124 when the commercial power supply 10 is operating normally.
Power is supplied to the load 20 via the. Also, commercial power source 1
The AC output of 0 is converted into stable DC power by the charger 123 to charge the storage battery 122. Further, when the commercial power source 10 loses power, the inverter 124 converts the output of the storage battery 122 into stable power and supplies it to the load 20.
【０００５】[0005]
【発明が解決しようとする課題】上記構成からなる交流
電源装置の動作を図６（Ｂ）を参照して簡単に説明す
る。図６（Ｂ）は図５に示す交流電源装置１２’の各部
の動作状態を負荷２０の電力需要特性Ｑ’と共に示して
いる。通常、コンバータ１２１は、タイマの設定により
負荷２０からの電力需要が電力会社の契約電力より多く
なる時間帯ｔ２0≦ｔ≦ｔ21にコンバータ１２０の運転
を停止し、かつ負荷２０からの電力需要が契約電力以下
の時間帯ｔ＜ｔ２0、ｔ＞21では運転状態となるように
制御される。The operation of the AC power supply device having the above structure will be briefly described with reference to FIG. 6 (B). FIG. 6B shows the operating state of each part of the AC power supply device 12 ′ shown in FIG. 5 together with the power demand characteristic Q ′ of the load 20. Normally, the converter 121 stops the operation of the converter 120 during a time period t20 ≦ t ≦ t21 when the power demand from the load 20 exceeds the contracted power of the power company due to the setting of the timer, and the power demand from the load 20 contracts. It is controlled so as to be in the operating state in the time zones t <t20 and t> 21, which are less than the electric power.
【０００６】時間帯ｔ２0≦ｔ≦ｔ21では、蓄電池１２
２出力をインバータ１２４が安定した交流電力に変換
し、負荷２０に供給する。このときの蓄電池１２２の放
電により消費した蓄電池電力を補充するために負荷２０
の電力需要が低下した時間帯ｔ22≦ｔ≦ｔ23で充電器１
２３を動作状態とし、コンバータ１２１は、負荷２０の
電力需要Ｑ’に応じた交流電力をインバータ１２４を介
して供給すると共に、充電器１２３を介して蓄電池１２
２に充電を行う。このように、蓄電池１２２の充電時に
は、負荷に供給する電力と蓄電池に充電する電力を同時
に供給するため商用電源１０からの供給電力が大きくな
る。In the time zone t20≤t≤t21, the storage battery 12
The inverter 124 converts the two outputs into stable AC power and supplies it to the load 20. In order to supplement the storage battery power consumed by the discharge of the storage battery 122 at this time, the load 20
1 during the time t22 ≤ t ≤ t23 when the power demand of
23 is in an operating state, the converter 121 supplies AC power corresponding to the power demand Q ′ of the load 20 via the inverter 124, and the storage battery 12 via the charger 123.
Charge to 2. As described above, when the storage battery 122 is charged, the power supplied to the load and the power charged to the storage battery are simultaneously supplied, so that the power supplied from the commercial power supply 10 becomes large.
【０００７】したがって、負荷の電力需要が最大となる
電力量と電力会社との契約電力量との差を大きくする、
すなわちより契約電力量を低く設定すると、コンバータ
１２１の運転動作、運転停止動作に伴い、負荷の電力需
要特性に応じて電力供給する際に蓄電池が余分に充放電
される電力量が大きくなり、商用電源１０からの供給電
力が増大するので、図６（Ｂ）に示すように契約電力量
を低く設定することができないという問題が有った。本
発明はこのような事情に鑑みてなされたものであり、商
用電源側のピーク電力を抑制すると共に、負荷に安定な
電力を供給する交流電源供給システムを提供することを
目的とする。Therefore, the difference between the amount of electric power that maximizes the electric power demand of the load and the amount of electric power contracted with the electric power company is increased.
That is, when the contracted electric energy is set to be lower, the amount of electric power with which the storage battery is excessively charged and discharged when the electric power is supplied according to the power demand characteristics of the load increases with the operation operation and the operation stop operation of the converter 121. Since the power supplied from the power source 10 increases, there is a problem that the contract power amount cannot be set low as shown in FIG. 6 (B). The present invention has been made in view of such circumstances, and an object thereof is to provide an AC power supply system that suppresses peak power on the commercial power supply side and supplies stable power to a load.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に請求項１に記載の発明は、負荷に交流電源を供給する
交流電源供給システムであって、商用交流電力を供給す
る商用電源と、蓄電池と、前記商用電源出力を直流電力
に変換して前記蓄電池を充電するコンバータと、該コン
バータ出力及び前記蓄電池出力を安定な交流電力に変換
するインバータとを有し、負荷に交流電力を供給する交
流電源装置と、前記交流電源装置から負荷に供給される
交流電力を計測する電力計測手段と、前記電力計測手段
の出力を取り込み、前記負荷に供給される交流電力の平
均値を演算し、前記コンバータが該平均値に相当する直
流電力を出力するように前記コンバータを制御する制御
手段とを有することを特徴とする。In order to achieve the above object, the invention according to claim 1 is an AC power supply system for supplying AC power to a load, and a commercial power supply for supplying commercial AC power, A storage battery, a converter that converts the commercial power output to DC power to charge the storage battery, and an inverter that converts the converter output and the storage battery output to stable AC power, and supply AC power to a load. An AC power supply device, a power measuring unit that measures AC power supplied to the load from the AC power supply unit, and an output of the power measuring unit is taken in to calculate an average value of the AC power supplied to the load, And a control means for controlling the converter so that the converter outputs DC power corresponding to the average value.
【０００９】また、請求項２に記載の発明は、負荷に交
流電源を供給する交流電源供給システムであって、商用
交流電力を負荷に供給する商用電源と、蓄電池と、前記
商用電源出力を直流電力に変換して前記蓄電池を充電
し、または該蓄電池出力を交流電力に変換して負荷に交
流電力を供給する電力変換手段とを有する交流電源装置
と、前記交流電源装置から負荷に供給される交流電力を
計測する電力計測手段と、前記電力計測手段の出力を取
り込み、前記負荷に供給される交流電力の平均値を演算
し、前記負荷が要求する電力量に応じて前記電力変換手
段の電力出力の出力方向の切替及び出力電力量を制御す
る制御手段とを有する。According to a second aspect of the present invention, there is provided an AC power supply system for supplying AC power to a load, wherein a commercial power supply for supplying commercial AC power to the load, a storage battery, and the commercial power output are DC. An AC power supply device having power conversion means for converting the power to charge the storage battery or converting the storage battery output to AC power to supply AC power to a load, and the AC power supply device to supply the load Power measuring means for measuring AC power, and an output of the power measuring means are fetched, an average value of AC power supplied to the load is calculated, and the power of the power converting means is calculated according to the amount of power required by the load. And a control means for controlling the switching of the output direction of the output and the output electric energy.
【００１０】また、請求項３に記載の発明は、請求項２
に記載の交流電源供給システムにおいて、前記制御手段
は、前記負荷の要求する電力量が前記平均値以上となる
時点で前記電力変換手段が前記蓄電池出力を交流電力に
変換し、前記負荷の要求する電力量が前記平均値未満と
なる時点で前記電力変換手段が前記商用電源出力を直流
電力に変換して蓄電池に充電するように前記電力変換手
段の出力方向を切り替え、かつ前記平均値を基準とした
出力指令値を与えることにより前記負荷の要求する電力
量を該負荷に供給するように前記電力変換手段を制御す
ることを特徴とする。Further, the invention according to claim 3 is the same as claim 2
In the alternating-current power supply system according to claim 7, the control means converts the storage battery output into alternating-current power by the power conversion means when the amount of power required by the load is equal to or higher than the average value, and requests the load. When the amount of electric power is less than the average value, the power conversion means switches the output direction of the power conversion means so that the commercial power output is converted into DC power to charge the storage battery, and the average value is used as a reference. The power conversion means is controlled so as to supply the load with the amount of electric power required by the load by giving the output command value.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施形態を、図面
を参照して詳細に説明する。本発明の第１の実施形態に
係る交流電源供給システムの構成を図１に示す。同図に
おいて、本発明の第１の実施形態に係る交流電源供給シ
ステムは、商用交流電力を供給する商用電源１０と、負
荷に交流電力を供給する交流電源装置１２と、交流電源
装置１２から負荷２０に供給される交流電力を計測する
電力計測手段としての出力電力計１４と、出力電力計１
４の出力を取り込み、負荷２０に供給される交流電力の
平均値を演算し、コンバータ１２０が該平均値に相当す
る直流電力を出力するようにコンバータ１２０を制御す
る制御手段としての制御回路１６とを有している。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of an AC power supply system according to the first embodiment of the present invention. In FIG. 1, the AC power supply system according to the first embodiment of the present invention includes a commercial power supply 10 that supplies commercial AC power, an AC power supply device 12 that supplies AC power to a load, and a load from the AC power supply device 12. An output wattmeter 14 as an electric power measuring means for measuring the AC electric power supplied to the rectifier 20 and an output wattmeter 1
And a control circuit 16 as a control means for controlling the converter 120 so that the converter 120 outputs the DC power corresponding to the average value by calculating the average value of the AC power supplied to the load 20. have.
【００１２】交流電源装置１２は、蓄電池１２２と、商
用電源出力を直流電力に変換して蓄電池１２２を充電す
るコンバータ１２０と、該コンバータ１２０出力及び蓄
電池１２２出力を安定な交流電力に変換するインバータ
１２４とを有している。ここで、電力会社との契約電
力、すなわち、商用電源の電力容量は５０ｋＷであり、
負荷の需要電力の最大値は１００ｋＷ、したがって、イ
ンバータ１２４の出力容量は１００ｋＷであるものとす
る。The AC power supply device 12 includes a storage battery 122, a converter 120 for converting the commercial power supply output into DC power to charge the storage battery 122, and an inverter 124 for converting the converter 120 output and the storage battery 122 output into stable AC power. And have. Here, the contract power with the power company, that is, the power capacity of the commercial power source is 50 kW,
It is assumed that the maximum value of the demand power of the load is 100 kW and therefore the output capacity of the inverter 124 is 100 kW.
【００１３】上記構成からなる本発明の第１の実施形態
に係る交流電源供給システムの動作を、図３を参照して
説明する。図３は負荷２０の電力需要特性と、本実施形
態に係る交流電源供給システムの運転状態との関係を示
している。図３において、曲線Ｑ１は負荷２０の電力需
要特性を示している。交流電源装置１２が運転され、負
荷２０に交流電力が供給されると、出力電力計１４によ
り交流電源装置１２より負荷２０に供給される交流電力
が計測され、その計測値は制御回路１６に入力される。The operation of the AC power supply system having the above-described structure according to the first embodiment of the present invention will be described with reference to FIG. FIG. 3 shows the relationship between the power demand characteristic of the load 20 and the operating state of the AC power supply system according to this embodiment. In FIG. 3, a curve Q1 shows the power demand characteristic of the load 20. When the AC power supply device 12 is operated and the AC power is supplied to the load 20, the output power meter 14 measures the AC power supplied from the AC power supply device 12 to the load 20, and the measured value is input to the control circuit 16. To be done.
【００１４】制御回路１６は、入力される出力電力計１
４の計測値（負荷２０に供給される交流電力）の平均値
を演算し、該平均値に相当する直流電力を出力させるた
めの制御信号（出力指令）をコンバータ１２０に出力す
る。この結果、コンバータ１２０からは、常に演算され
た平均値に相当する直流電力Ｐ0を出力する。一方、負
荷２０は１日のうちで特定の時間帯（ｔ1≦ｔ≦ｔ2）で
電力需要が高く、ｔ＜ｔ1、ｔ＞ｔ2の時間帯で電力需要
が低い電力需要特性Ｑ１を有している。The control circuit 16 inputs the output power meter 1
An average value of the measured values of 4 (AC power supplied to the load 20) is calculated, and a control signal (output command) for outputting DC power corresponding to the average value is output to the converter 120. As a result, converter 120 always outputs DC power P0 corresponding to the calculated average value. On the other hand, the load 20 has a power demand characteristic Q1 in which the power demand is high in a specific time zone (t1≤t≤t2) and the power demand is low in the time zone of t <t1, t> t2 within a day. There is.
【００１５】また、インバータ１２４は、電力需要特性
Ｑ１に応じた交流電力を負荷２０に出力する。したがっ
て、ｔ＜ｔ1、ｔ＞ｔ2の時間帯では、負荷２０の需要電
力は平均値の電力Ｐ0を下回り、この電力Ｐ0と負荷２０
の需要電力との差分に相当する電力は矢印Ｃで示される
ように蓄電池１２２に充電される。The inverter 124 also outputs AC power corresponding to the power demand characteristic Q1 to the load 20. Therefore, in the time period of t <t1 and t> t2, the demand power of the load 20 is below the average power P0, and this power P0 and the load 20
The electric power corresponding to the difference from the demanded electric power is charged in the storage battery 122 as indicated by an arrow C.
【００１６】これに対して、時間帯ｔ1≦ｔ≦ｔ2では、
負荷２０の需要電力は平均値の電力Ｐ0を上回り、負荷
２０の需要電力と電力Ｐ0との差分に相当する電力は矢
印Ｂで示されるように放電することにより蓄電池１２２
からインバータ１２４に供給され、インバータ１２４で
は、コンバータ１２０から供給される直流電力Ｐ0と、
蓄電池１２２から供給される直流電力とを加算した直流
電力を交流電力に変換し、負荷２０に供給する。なお、
コンバータ１２０、インバータ１２４の効率は１００％
ではないので、実際にはこれらの効率を考慮した値の電
力を入力する必要があるが、説明の便宜上、省略してあ
る。On the other hand, in the time zone t1≤t≤t2,
The demand power of the load 20 exceeds the average power P0, and the power corresponding to the difference between the demand power of the load 20 and the power P0 is discharged as indicated by an arrow B, whereby the storage battery 122 is discharged.
From the DC power P 0 supplied from the converter 120 to the inverter 124.
The DC power added with the DC power supplied from the storage battery 122 is converted into AC power and supplied to the load 20. In addition,
Efficiency of converter 120 and inverter 124 is 100%
Therefore, it is necessary to input the electric power of a value that takes these efficiencies into consideration, but it is omitted for convenience of description.
【００１７】本発明の第１の実施形態に係る交流電源供
給システムは、商用電源が停電しても瞬断が発生しない
ので、瞬断が発生することが許容されないような負荷に
対して使用するのに適している。The AC power supply system according to the first embodiment of the present invention is used for a load that is not allowed to occur because a momentary interruption does not occur even if the commercial power source fails. Suitable for
【００１８】本発明の第１の実施形態に係る交流電源供
給システムによれば、商用電源１０から一定の契約電力
が供給されるコンバータ１２０を、負荷２０に供給する
電力量の平均値に相当する電力を常時、出力するように
制御し、負荷２０の電力需要が前記平均値以下の場合に
はコンバータ出力の余剰電力を蓄電池１２２に充電し、
負荷２０の電力需要が前記平均値以上の場合には不足電
力を蓄電池１２２より出力（放電）させ、インバータ１
２４に入力するようにしたので、山上や僻地等不便な地
域においても安定して負荷に電力を供給することができ
ると共に、図６に示すように従来に比して契約電力の値
を大幅に低く設定することができ、電力損失の少ない交
流電源供給システムを実現することができる。According to the AC power supply system according to the first embodiment of the present invention, the converter 120 to which a constant contract power is supplied from the commercial power supply 10 corresponds to the average value of the amount of power supplied to the load 20. When the power demand of the load 20 is less than or equal to the average value, the storage battery 122 is charged with the surplus power output from the converter,
When the power demand of the load 20 is equal to or more than the average value, the power shortage is output (discharged) from the storage battery 122, and the inverter 1
Since it is input to 24, power can be stably supplied to the load even in an inconvenient area such as a mountain or a remote area, and as shown in FIG. It is possible to set an AC power supply system that can be set low and has a small power loss.
【００１９】次に、本発明の第２の実施形態に係る交流
電源供給システムの構成を図２に示す。同図において、
本発明の第２の実施形態に係る交流電源供給システム
は、商用交流電力を負荷２０に供給する商用電源１０
と、負荷に交流電力を供給する交流電源装置３０と、交
流電源装置３０から負荷２０に供給される交流電力を計
測する電力計測手段としての出力電力計３２と、出力電
力計３２の出力を取り込み、負荷２０が要求する電力量
に応じて交流電源装置３０内の電力変換手段として機能
するＡＣ／ＤＣ双方向コンバータ３００の電力出力の出
力方向の切替及び出力電力量を制御する制御手段として
の制御回路３４とを有している。Next, FIG. 2 shows the configuration of an AC power supply system according to the second embodiment of the present invention. In the figure,
The AC power supply system according to the second embodiment of the present invention is a commercial power supply 10 that supplies commercial AC power to a load 20.
An AC power supply device 30 that supplies AC power to the load; an output power meter 32 as a power measuring unit that measures the AC power supplied from the AC power supply device 30 to the load 20; and an output of the output power meter 32. , Control as a control unit for switching the output direction of the power output of the AC / DC bidirectional converter 300 functioning as a power conversion unit in the AC power supply device 30 according to the amount of power required by the load 20 and controlling the output power amount. Circuit 34.
【００２０】交流電源装置３０は、蓄電池３０２と、商
用電源１０の出力を直流電力に変換して蓄電池３０２を
充電し、または該蓄電池３０２の出力を交流電力に変換
して負荷２０に交流電力を供給するＡＣ／ＤＣ双方向コ
ンバータ３００とを有している。ここで、電力会社との
契約電力、すなわち、商用電源の電力容量は５０ｋＷで
あり、負荷の需要電力の最大値は１００ｋＷ、したがっ
て、ＡＣ／ＤＣ双方向コンバータ３００の出力容量は１
００ｋＷであるものとする。商用電源１０からは常時、
５０ｋＷの電力が負荷２０に供給されている。The AC power supply device 30 converts the output of the storage battery 302 and the commercial power supply 10 into DC power to charge the storage battery 302, or converts the output of the storage battery 302 into AC power and supplies AC power to the load 20. AC / DC bidirectional converter 300 for supplying. Here, the contracted electric power with the electric power company, that is, the electric power capacity of the commercial power source is 50 kW, and the maximum value of the electric power demand of the load is 100 kW. Therefore, the output capacity of the AC / DC bidirectional converter 300 is 1
It shall be 00 kW. Always from the commercial power supply 10,
The power of 50 kW is supplied to the load 20.
【００２１】上記構成からなる本発明の第２の実施形態
に係る交流電源供給システムの動作を、図４を参照して
説明する。図４は負荷２０の電力需要特性と、本実施形
態に係る交流電源供給システムの運転状態との関係を示
している。図４において、曲線Ｑ２は負荷２０の電力需
要特性を示している。負荷２０は１日のうちで特定の時
間帯（ｔ10≦ｔ≦ｔ11）で電力需要が高く、ｔ＜ｔ10、
ｔ＞ｔ11の時間帯で電力需要が低い電力需要特性Ｑ２を
有している。The operation of the AC power supply system having the above-mentioned structure according to the second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the relationship between the power demand characteristic of the load 20 and the operating state of the AC power supply system according to this embodiment. In FIG. 4, the curve Q2 shows the power demand characteristic of the load 20. The load 20 has a high power demand in a specific time zone (t10 ≦ t ≦ t11) of the day, and t <t10,
It has a power demand characteristic Q2 in which power demand is low in the time zone of t> t11.
【００２２】商用電源１０からは既述したように、常
時、契約電力Ｐ0（５０ｋＷ）が負荷２０に供給されて
いる。この状態下において、交流電源装置３０が運転さ
れ、商用電源１０及び交流電源装置３０より負荷２０に
交流電力が供給されると、出力電力計３２により負荷２
０に供給される交流電力が計測され、その計測値は制御
回路３４に入力される。As described above, the commercial power supply 10 constantly supplies the contract power P0 (50 kW) to the load 20. In this state, when the AC power supply device 30 is operated and AC power is supplied to the load 20 from the commercial power supply 10 and the AC power supply device 30, the output power meter 32 loads the load 2
The AC power supplied to 0 is measured, and the measured value is input to the control circuit 34.
【００２３】制御回路３４は、入力される出力電力計３
２の計測値（負荷２０に供給される交流電力）の平均値
を演算し、負荷２０の要求する電力量が前記平均値以上
となる時点でＡＣ／ＤＣ双方向コンバータ３００が蓄電
池３０２出力を交流電力に変換して負荷２０に供給し、
負荷２０の要求する電力量が前記平均値以下となる時点
でＡＣ／ＤＣ双方向コンバータ３００が商用電源１０出
力を直流電力に変換して蓄電池３０２に充電するように
ＡＣ／ＤＣ双方向コンバータ３００の出力方向を切り替
えるための制御信号と、前記平均値を基準とした出力指
令値を与えることにより前記負荷の要求する電力量を該
負荷に供給するようにＡＣ／ＤＣ双方向コンバータ３０
０を制御する。The control circuit 34 inputs the output power meter 3
The average value of the two measured values (AC power supplied to the load 20) is calculated, and the AC / DC bidirectional converter 300 converts the output of the storage battery 302 into AC at the time when the amount of power required by the load 20 becomes equal to or more than the average value. Converted to electric power and supplied to the load 20,
The AC / DC bidirectional converter 300 converts the output of the commercial power supply 10 into DC power and charges the storage battery 302 when the power amount required by the load 20 becomes equal to or less than the average value. The AC / DC bidirectional converter 30 is configured to supply the load with the amount of electric power required by the load by giving a control signal for switching the output direction and an output command value based on the average value.
Control 0.
【００２４】すなわち、制御回路はＡＣ／ＤＣ双方向コ
ンバータ３００の出力方向の切替制御を行うための制御
信号と、負荷２０の需要電力を供給するために商用電源
１０から負荷２０に供給される交流電力に加えてＡＣ／
ＤＣ双方向コンバータ３００から負荷２０に対して出力
すべき交流電力の出力指令をＡＣ／ＤＣ双方向コンバー
タ３００に出力する。That is, the control circuit controls the switching of the output direction of the AC / DC bidirectional converter 300, and the alternating current supplied from the commercial power source 10 to the load 20 to supply the demand power of the load 20. AC / in addition to power
The output command of the AC power to be output from the DC bidirectional converter 300 to the load 20 is output to the AC / DC bidirectional converter 300.
【００２５】ｔ＜ｔ10の時間帯では、負荷２０の需要電
力は平均値の電力Ｐ0（商用電源１０出力）を下回って
おり、このときＡＣ／ＤＣ双方向コンバータ３００の出
力方向は制御回路３４の制御下に、蓄電池３０２側、す
なわち、矢印Ｃ’で示すように商用電源１０の交流電力
出力の一部を直流電力に変換して蓄電池３０２に充電す
る方向（矢印Ｃ’方向）に切り替えられている。そし
て、平均値の電力Ｐ0と負荷２０の需要電力との差分に
応じた電力量だけ蓄電池３０２に充電するように制御回
路３４よりＡＣ／ＤＣ双方向コンバータ３００に出力指
令が出力される。In the time period of t <t10, the demand power of the load 20 is lower than the average power P0 (commercial power supply 10 output), and at this time, the output direction of the AC / DC bidirectional converter 300 is the control circuit 34. Under the control, the storage battery 302 side, that is, a direction in which a part of the AC power output of the commercial power source 10 is converted into DC power to charge the storage battery 302 as indicated by the arrow C ′ (direction of arrow C ′), is switched. There is. Then, an output command is output from the control circuit 34 to the AC / DC bidirectional converter 300 so that the storage battery 302 is charged with the amount of power corresponding to the difference between the average power P0 and the demand power of the load 20.
【００２６】次いで、時刻ｔ10以降の時間帯では、負荷
２０の需要電力は平均値の電力Ｐ0を超えるので、制御
回路３４よりＡＣ／ＤＣ双方向コンバータ３００に出力
方向を負荷側に、すなわち蓄電池３０２が放電状態とな
り、蓄電池３０２出力を交流電力に変換して負荷に出力
する方向（矢印Ｂ’方向）に切り替えるための制御信号
が出力され、これと同時に平均値の電力Ｐ0と負荷２０
の需要電力との差分に応じた電力量だけ蓄電池３０２出
力を交流電力に変換するように制御回路３４よりＡＣ／
ＤＣ双方向コンバータ３００に出力指令が出力される。
この状態は、ｔ10≦ｔ＜ｔ11において、継続する。Next, in the time zone after the time t10, the power demand of the load 20 exceeds the average power P0, so that the output direction from the control circuit 34 to the AC / DC bidirectional converter 300 is the load side, that is, the storage battery 302. Is discharged, and a control signal for converting the output of the storage battery 302 into the direction in which the output is converted to AC power and output to the load (direction of arrow B ') is output, and at the same time, the average power P0 and load 20 are output.
AC / AC from the control circuit 34 so as to convert the output of the storage battery 302 into AC power by an amount of power according to the difference with the demand power of
An output command is output to the DC bidirectional converter 300.
This state continues when t10≤t <t11.
【００２７】さらに、時刻ｔ11以降の時間帯では、ｔ＜
ｔ10の時間帯と同様に負荷２０の需要電力は平均値の電
力Ｐ0を下り、このときＡＣ／ＤＣ双方向コンバータ３
００の出力方向は制御回路３４の制御下に、蓄電池３０
２側、すなわち、矢印Ｃ’で示すように商用電源１０の
交流電力出力の一部を直流電力に変換して蓄電池３０２
に充電する方向（矢印Ｃ’方向）に切り替えられてい
る。Further, in the time zone after the time t11, t <
As in the time zone of t10, the demand power of the load 20 falls below the average power P0, and at this time, the AC / DC bidirectional converter 3
The output direction of 00 is under the control of the control circuit 34,
2 side, that is, as shown by an arrow C ′, a part of the AC power output of the commercial power supply 10 is converted into DC power and the storage battery 302
The charging direction is switched to the direction (arrow C'direction).
【００２８】そして、平均値の電力Ｐ0と負荷２０の需
要電力との差分に応じた電力量だけ蓄電池３０２に充電
するように制御回路３４よりＡＣ／ＤＣ双方向コンバー
タ３００に出力指令が出力される。このようにして、負
荷２０には図４に示すように、全ての時間帯にわたって
負荷の電力需要特性Ｑ２に従った電力量が供給されるこ
ととなる。Then, an output command is output from the control circuit 34 to the AC / DC bidirectional converter 300 so that the storage battery 302 is charged by the amount of power corresponding to the difference between the average power P0 and the demand power of the load 20. . In this way, as shown in FIG. 4, the load 20 is supplied with the amount of power according to the power demand characteristic Q2 of the load over the entire time period.
【００２９】なお、本発明の第２の実施形態に係る交流
電源供給システムは、商用電源が停電した場合に、ＡＣ
／ＤＣ双方向コンバータ３００の出力方向が切り替えら
れた場合に瞬断が発生することがあるので、瞬断が発生
することが許容されるような負荷に対して使用するのが
好ましい。The AC power supply system according to the second embodiment of the present invention uses the AC power when the commercial power supply fails.
Since a momentary interruption may occur when the output direction of the / DC bidirectional converter 300 is switched, it is preferably used for a load that allows the occurrence of the momentary interruption.
【００３０】以上に説明したように、本発明の第２の実
施形態に係る交流電源供給システムによれば、制御回路
３４は、前記負荷に供給される交流電力の平均値を演算
し、負荷の要求する電力量が前記平均値以上となる時点
でＡＣ／ＤＣ双方向コンバータ３００が蓄電池３０２出
力を交流電力に変換し、負荷２０が要求する電力量が前
記平均値未満となる時点でＡＣ／ＤＣ双方向コンバータ
３００が商用電源１０を直流電力に変換して蓄電池３０
２に充電するようにＡＣ／ＤＣ双方向コンバータ３００
の出力方向を切り替え、かつ前記平均値を基準とした出
力指令値を与えることにより前記負荷の要求する電力量
を該負荷に供給するようにＡＣ／ＤＣ双方向コンバータ
３００を制御するようにしたので、山上や僻地等不便な
地域においても安定して負荷に電力を供給することがで
きると共に、図６に示すように、従来に比して契約電力
の値を大幅に低く設定することができ、電力損失の少な
い交流電源供給システムを実現することができる。As described above, according to the AC power supply system according to the second embodiment of the present invention, the control circuit 34 calculates the average value of the AC power supplied to the load and calculates the load The AC / DC bidirectional converter 300 converts the output of the storage battery 302 into AC power at the time when the requested power amount becomes equal to or higher than the average value, and the AC / DC at the time when the power amount requested by the load 20 becomes lower than the average value. The bidirectional converter 300 converts the commercial power source 10 into DC power to convert the storage battery 30.
AC / DC bidirectional converter 300 to charge to 2
The AC / DC bidirectional converter 300 is controlled so as to supply the amount of electric power required by the load to the load by switching the output direction of the load and giving an output command value based on the average value. , The power can be stably supplied to the load even in an inconvenient area such as a mountain or a remote area, and as shown in FIG. 6, the value of the contract power can be set significantly lower than that of the conventional one. An AC power supply system with less power loss can be realized.
【００３１】[0031]
【発明の効果】本発明によれば、山上や僻地等不便な地
域においても商用電源停電時に安定して負荷に電力を供
給することができると共に、従来に比して契約電力の値
を低く設定することができ、電力損失の少ない交流電源
供給システムを実現することができる。According to the present invention, it is possible to stably supply electric power to a load even when there is an inconvenience such as on a mountain or in a remote area at the time of a power outage of a commercial power source, and the contract electric power value is set to be lower than that in the prior art. Therefore, an AC power supply system with less power loss can be realized.
【図１】 本発明の第１の実施形態に係る交流電源供給
システムの構成を示すブロック図。FIG. 1 is a block diagram showing a configuration of an AC power supply system according to a first embodiment of the present invention.
【図２】 本発明の第２の実施形態に係る交流電源供給
システムの構成を示すブロック図。FIG. 2 is a block diagram showing a configuration of an AC power supply system according to a second embodiment of the present invention.
【図３】 図１に示した第１の実施形態に係る交流電源
供給システムにおける負荷の電力需要特性と、交流電源
供給システムの運転状態との関係を示す説明図。FIG. 3 is an explanatory diagram showing a relationship between a power demand characteristic of a load in the AC power supply system according to the first embodiment shown in FIG. 1 and an operating state of the AC power supply system.
【図４】 図２に示した第２の実施形態に係る交流電源
供給システムにおける負荷の電力需要特性と、交流電源
供給システムの運転状態との関係を示す説明図。FIG. 4 is an explanatory diagram showing a relationship between a power demand characteristic of a load in the AC power supply system according to the second embodiment shown in FIG. 2 and an operating state of the AC power supply system.
【図５】 従来の交流電源供給システムの構成を示すブ
ロック図。FIG. 5 is a block diagram showing a configuration of a conventional AC power supply system.
【図６】 本発明に係る交流電源供給システムと従来の
交流電源供給システムとの効果の差異を示す説明図。FIG. 6 is an explanatory diagram showing a difference in effect between the AC power supply system according to the present invention and the conventional AC power supply system.
１０…商用電源、１２、３０…交流電源装置、１４、３
２…出力電力計、１６、３４…制御回路、２０…負荷、
１２０…コンバータ、１２２、３０２…蓄電池、３００
…ＡＣ／ＤＣ双方向コンバータ10 ... Commercial power supply, 12, 30 ... AC power supply device, 14, 3
2 ... Output power meter, 16, 34 ... Control circuit, 20 ... Load,
120 ... Converter, 122, 302 ... Storage battery, 300
... AC / DC bidirectional converter
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5G003 AA01 BA01 CA01 CA11 CC07 DA07 DA15 GB03 GB06 5G015 GA02 HA02 HA16 JA22 JA26 JA52 5G066 JA02 JB03 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 5G003 AA01 BA01 CA01 CA11 CC07 DA07 DA15 GB03 GB06 5G015 GA02 HA02 HA16 JA22 JA26 JA52 5G066 JA02 JB03
Claims (3)
システムであって、 商用交流電力を供給する商用電源と、 蓄電池と、前記商用電源出力を直流電力に変換して前記
蓄電池を充電するコンバータと、該コンバータ出力及び
前記蓄電池出力を安定な交流電力に変換するインバータ
とを有し、負荷に交流電力を供給する交流電源装置と、 前記交流電源装置から負荷に供給される交流電力を計測
する電力計測手段と、 前記電力計測手段の出力を取り込み、前記負荷に供給さ
れる交流電力の平均値を演算し、前記コンバータが該平
均値に相当する直流電力を出力するように前記コンバー
タを制御する制御手段と、 を有することを特徴とする交流電源供給システム。1. An AC power supply system for supplying AC power to a load, a commercial power supply for supplying commercial AC power, a storage battery, and a converter for converting the commercial power output to DC power to charge the storage battery. And an inverter that converts the converter output and the storage battery output into stable AC power, and supplies AC power to the load, and measures AC power supplied from the AC power supply to the load. The output of the electric power measuring unit and the electric power measuring unit is taken in, the average value of the AC power supplied to the load is calculated, and the converter is controlled so that the converter outputs the DC power corresponding to the average value. An AC power supply system comprising: a control unit.
システムであって、 商用交流電力を負荷に供給する商用電源と、 蓄電池と、前記商用電源出力を直流電力に変換して前記
蓄電池を充電し、または該蓄電池出力を交流電力に変換
して負荷に交流電力を供給する電力変換手段とを有する
交流電源装置と、 前記交流電源装置から負荷に供給される交流電力を計測
する電力計測手段と、 前記電力計測手段の出力を取り込み、前記負荷に供給さ
れる交流電力の平均値を演算し、前記負荷が要求する電
力量に応じて前記電力変換手段の電力出力の出力方向の
切替及び出力電力量を制御する制御手段と、 を有することを特徴とする交流電源供給システム。2. An AC power supply system for supplying AC power to a load, the commercial power supply supplying commercial AC power to the load, a storage battery, and converting the commercial power output to DC power to charge the storage battery. Or an AC power supply unit having a power conversion unit that converts the output of the storage battery into AC power and supplies the AC power to the load, and a power measurement unit that measures the AC power supplied from the AC power supply unit to the load. , Taking the output of the power measuring means, calculating the average value of the AC power supplied to the load, switching the output direction of the power output of the power converting means and the output power according to the amount of power required by the load An AC power supply system comprising: a control unit that controls the amount.
力量が前記平均値以上となる時点で前記電力変換手段が
前記蓄電池出力を交流電力に変換し、前記負荷の要求す
る電力量が前記平均値未満となる時点で前記電力変換手
段が前記商用電源出力を直流電力に変換して蓄電池に充
電するように前記電力変換手段の出力方向を切り替え、
かつ前記平均値を基準とした出力指令値を与えることに
より前記負荷の要求する電力量を該負荷に供給するよう
に前記電力変換手段を制御することを特徴とする請求項
２に記載の交流電源供給システム。3. The control means converts the output of the storage battery into AC power by the power conversion means when the amount of power required by the load is equal to or more than the average value, and the amount of power required by the load is When the power conversion means becomes less than the average value, the power conversion means switches the output direction of the power conversion means so as to convert the commercial power output to DC power and charge the storage battery,
3. The AC power supply according to claim 2, wherein the power conversion means is controlled so as to supply the load with the amount of electric power required by the load by giving an output command value based on the average value. Supply system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002059466A JP3795414B2 (en) | 2002-03-05 | 2002-03-05 | AC power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002059466A JP3795414B2 (en) | 2002-03-05 | 2002-03-05 | AC power supply system |
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| Publication Number | Publication Date |
|---|---|
| JP2003259566A true JP2003259566A (en) | 2003-09-12 |
| JP3795414B2 JP3795414B2 (en) | 2006-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002059466A Expired - Fee Related JP3795414B2 (en) | 2002-03-05 | 2002-03-05 | AC power supply system |
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| JP (1) | JP3795414B2 (en) |
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| JP2005124249A (en) * | 2003-10-14 | 2005-05-12 | Tokyo Electric Power Co Inc:The | Uninterruptible power supply with power storage function and its controlling method and controller |
| US7388364B2 (en) | 2004-02-19 | 2008-06-17 | Siemens Ag Osterreich | Device for covering the peak load |
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| JP2005124249A (en) * | 2003-10-14 | 2005-05-12 | Tokyo Electric Power Co Inc:The | Uninterruptible power supply with power storage function and its controlling method and controller |
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