JP5556422B2 - Battery system - Google Patents

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JP5556422B2
JP5556422B2 JP2010142459A JP2010142459A JP5556422B2 JP 5556422 B2 JP5556422 B2 JP 5556422B2 JP 2010142459 A JP2010142459 A JP 2010142459A JP 2010142459 A JP2010142459 A JP 2010142459A JP 5556422 B2 JP5556422 B2 JP 5556422B2
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鉱一 伊藤
陽子 梅田
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東京電力株式会社
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    • YGENERAL 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
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    • Y02E60/10Energy storage using batteries

Description

本発明は、電力系統に接続された蓄電池を系統負荷制御に利用する蓄電池システムに関する。   The present invention relates to a storage battery system that uses a storage battery connected to a power system for system load control.

蓄電池の大容量化に伴い、電力系統の系統負荷制御に蓄電池を利用することが検討されている。蓄電池には各種のものがあり、例えば、NAS電池は、エネルギー密度が高く放電速度も速く、しかも安価である。また、リチウム電池は、エネルギー密度が高く、充放電速度も速く急速充放電が可能である。   With increasing capacity of storage batteries, the use of storage batteries for power system load control is being studied. There are various types of storage batteries. For example, NAS batteries have a high energy density, a high discharge rate, and are inexpensive. Moreover, the lithium battery has a high energy density and a high charge / discharge rate, and can be rapidly charged / discharged.

電力系統の系統負荷制御に利用するには、大容量で充放電速度が速いものが適しているので、現状では、NAS電池やリチウム電池を組み合わせて電力系統の系統負荷制御に利用することが考えられる。   A large capacity and fast charge / discharge speed is suitable for use in power system load control of the power system, so at present, it is considered to use NAS battery or lithium battery in combination for power system load control. It is done.

自然エネルギ発電設備が接続された系統にNAS電池とキャパシタとを接続して、自然エネルギ発電設備の出力変動をNAS電池の遅れ時定数で平滑化し、NAS電池で吸収できない早い変動成分をキャパシタで吸収し、自然エネルギを用いた発電設備の出力変動を低コストで効果的に抑制できるようにしたものがある(例えば、特許文献1参照)。   By connecting a NAS battery and a capacitor to the system connected to the natural energy power generation facility, the output fluctuation of the natural energy power generation facility is smoothed by the delay time constant of the NAS battery, and fast fluctuation components that cannot be absorbed by the NAS battery are absorbed by the capacitor. However, there is one that can effectively suppress the output fluctuation of the power generation facility using natural energy at a low cost (for example, see Patent Document 1).

特開2007−135355号公報JP 2007-135355 A

しかし、電力系統の系統負荷制御に利用するには、大容量で充放電の双方とも高い応答性を有し、しかも安価である蓄電池が求められる。NAS電池は大容量で放電速度も速いが、充電速度が遅く急速充電ができないという難点を有する。また、リチウム電池は、エネルギー密度が高く充放電速度も速いので急速充放電が可能であるが、価格が高いと言う難点がある。   However, in order to use it for system load control of an electric power system, a storage battery that has a large capacity, has high responsiveness in both charge and discharge, and is inexpensive is required. A NAS battery has a large capacity and a high discharge speed, but has a drawback that the charging speed is slow and rapid charging cannot be performed. In addition, the lithium battery has a high energy density and a high charge / discharge rate, so that it can be rapidly charged / discharged, but has a drawback of high price.

そこで、価格が安い中古のリチウム電池を利用することが考えられる。中古のリチウム電池は充電容量は十分あるが、充放電速度が新品のリチウム電池より遅くなる傾向があり、結果的に、充放電のいずれか、あるいは双方の速度が新品のリチウム電池より劣ることになる。   Therefore, it is conceivable to use a used lithium battery at a low price. Second-hand lithium batteries have sufficient charge capacity, but charge / discharge rates tend to be slower than new lithium batteries, resulting in inferior charge / discharge speeds of either or both. Become.

本発明の目的は、大容量かつ充放電の応答性のよい蓄電池システムを提供することである。   An object of the present invention is to provide a storage battery system having a large capacity and good charge / discharge response.

請求項1の発明に係る蓄電池システムは、電力系統の負荷変動に応じて余剰電力を充電するとともに不足電力を放電する大容量蓄電池と、待機状態で充電深度が50%未満の所定の充電用充電深度に維持され前記電力系統から電力を急速充電するための充電用リチウム電池と、待機状態で充電深度が50%を超える所定の放電用充電深度に維持され前記電力系統に電力を急速放電するための放電用リチウム電池と、通常時は前記大容量蓄電池のみを前記電力系統に接続し、前記電力系統の負荷変動により急速充電が必要となったときは充電用リチウム電池のみを電力系統に接続し、前記電力系統の負荷変動により急速放電が必要となったときは前記放電用リチウム電池のみを電力系統に接続する接続切替装置と、前記大容量蓄電池、前記充電用リチウム電池、前記放電用リチウム電池の充放電制御を行う制御装置とを備え、前記電力系統の負荷変動により急速放電が必要となったときは、前記接続切替装置は、前記放電用リチウム電池のみを電力系統に接続するとともに、前記充電用リチウム電池を前記大容量蓄電池に接続し、前記制御装置は、前記放電用リチウム電池から前記電力系統に電力を放電する放電制御を行い、前記大容量蓄電池から前記充電用リチウム電池に電力を充電する充電制御を行い、前記放電用リチウム電池が放電停止となると、前記接続切替装置は、前記充電用リチウム電池と前記放電用リチウム電池とを入れ替え、一方、前記電力系統の負荷変動により急速充電が必要となったときは、前記接続切替装置は、前記充電用リチウム電池のみを電力系統に接続するとともに、前記放電用リチウム電池を前記大容量蓄電池に接続し、前記制御装置は、前記充電用リチウム電池に前記電力系統からの電力を充電する充電制御を行い、前記放電用リチウム電池から前記大容量蓄電池に電力を放電する放電制御を行い、前記充電用リチウム電池が充電停止となると、前記接続切替装置は、前記充電用リチウム電池と前記放電用リチウム電池とを入れ替えることを特徴とする。 The storage battery system according to the invention of claim 1 is a large-capacity storage battery that charges surplus power and discharges insufficient power in accordance with load fluctuations of the power system, and predetermined charging for charging with a charging depth of less than 50% in a standby state. A charging lithium battery for rapidly charging power from the electric power system maintained at a depth, and a rapid discharge of electric power to the electric power system maintained at a predetermined charging charge depth for charging exceeding 50% in a standby state and discharging the lithium battery, the normal connects only the large-capacity battery to the electric power system, when said became rapid charge required by the load fluctuation of the power system is connected only lithium battery charging in the power system , a connection switching unit for connecting only the lithium battery the discharge electric power system when the rapid discharge was required by the load fluctuation of the electric power system, the high capacity battery, the charging Lithium batteries, and a control unit that performs charging and discharging control of the discharge for lithium batteries, when the became rapid discharge required by load fluctuation of the power system, the connection switching unit, only the discharge for lithium batteries The charging device is connected to the power system, the charging lithium battery is connected to the large-capacity storage battery, and the control device performs discharge control for discharging power from the discharging lithium battery to the power system, from the large-capacity storage battery. When charging control for charging the charging lithium battery is performed and the discharging lithium battery stops discharging, the connection switching device replaces the charging lithium battery and the discharging lithium battery, When rapid charging is required due to load fluctuations in the power system, the connection switching device connects only the charging lithium battery to the power system. The discharging lithium battery is connected to the large-capacity storage battery, and the control device performs charging control for charging the charging lithium battery with electric power from the power system, and from the discharging lithium battery to the large battery. When the discharge control for discharging power to the capacity storage battery is performed and the charging lithium battery stops charging, the connection switching device replaces the charging lithium battery and the discharging lithium battery .

請求項2の発明に係る蓄電池システムは、請求項1の発明において、前記充電用リチウム電池として複数の充電用リチウム電池を有し、複数の充電用リチウム電池は、待機状態で充電深度が50%未満の所定の充電用充電深度に代えて、段階的に異なる所定の充電用充電深度に維持され、前記電力系統の負荷変動により急速放電が必要となったときは、前記接続切替装置は、前記放電用リチウム電池のみを前記電力系統に接続するとともに、前記複数の充電用リチウム電池を前記大容量蓄電池に接続し、前記制御装置は、前記放電用リチウム電池から前記電力系統に電力を放電する放電制御を行い、前記複数の充電用リチウム電池にそれぞれ充電停止となるまで前記大容量蓄電池からの電力を充電する充電制御を行い、前記放電用リチウム電池が放電停止となると、前記接続切替装置は、前記放電用リチウム電池を前記充電用リチウム電池に切り替え、充電停止となった充電用リチウム電池を放電用リチウム電池に切り替えることを特徴とする。 A storage battery system according to a second aspect of the present invention is the storage battery system according to the first aspect of the present invention, wherein the charging lithium battery has a plurality of charging lithium batteries, and the plurality of charging lithium batteries have a charging depth of 50% in a standby state. Instead of the predetermined charging depth of charging less than the predetermined charging charging depth that is gradually different, when rapid discharge is required due to load fluctuations of the power system, the connection switching device, Only the discharge lithium battery is connected to the power system, and the plurality of charge lithium batteries are connected to the large-capacity storage battery, and the control device discharges power from the discharge lithium battery to the power system. Charge control is performed to charge power from the large-capacity storage battery until the charging of each of the plurality of charging lithium batteries is stopped, and the discharging lithium battery There becomes a discharge stop, the connection switching device switches the discharging lithium battery to said charging lithium batteries, and switches the charging lithium batteries became charge stop the discharge for lithium batteries.

請求項3の発明に係る蓄電池システムは、請求項1の発明において、前記充電用リチウム電池として複数の充電用リチウム電池を有し、複数の充電用リチウム電池は、待機状態で充電深度が50%未満の所定の充電用充電深度に代えて、段階的に異なる所定の充電用充電深度に維持され、前記電力系統の負荷変動により急速充電が必要となったときは、前記接続切替装置は、前記複数の充電用リチウム電池のみを電力系統に接続するとともに、前記放電用リチウム電池を前記大容量蓄電池に接続し、前記制御装置は、前記複数の充電用リチウム電池にそれぞれ充電停止となるまで前記電力系統からの電力を充電する充電制御を行い、前記放電用リチウム電池から前記大容量蓄電池に電力を放電する放電制御を行い、前記充電用リチウム電池が充電停止となると、前記接続切替装置は、前記充電用リチウム電池を前記放電用リチウム電池に切り替え、放電停止となった放電用リチウム電池を充電用リチウム電池に切り替えることを特徴とする。 A storage battery system according to a third aspect of the present invention is the storage battery system according to the first aspect of the present invention, wherein the charging lithium battery has a plurality of charging lithium batteries, and the plurality of charging lithium batteries have a charging depth of 50% in a standby state. Instead of the predetermined charging depth less than the predetermined charging depth, the connection switching device is maintained at a predetermined charging depth that varies in stages, and when rapid charging is required due to load fluctuations of the power system, Only a plurality of charging lithium batteries are connected to the power system, and the discharging lithium batteries are connected to the large-capacity storage battery, and the controller is configured to connect the power until the charging of the plurality of charging lithium batteries is stopped. Charging control for charging power from the grid, discharging control for discharging power from the discharging lithium battery to the large-capacity storage battery, and the charging lithium battery When the electrostatic stopped, the connection switching device switches the charging lithium batteries lithium battery the discharge, and switches to the charging lithium batteries the discharging lithium battery became discharge stop.

請求項4の発明に係る蓄電池システムは、請求項1乃至3のいずれかの発明において、前記大容量蓄電池は、NAS電池または中古リチウム電池であることを特徴とする。 A storage battery system according to a fourth aspect of the present invention is the storage battery system according to any one of the first to third aspects, wherein the large-capacity storage battery is a NAS battery or a used lithium battery.

請求項5の発明に係わる蓄電池システムは、請求項1乃至6のいずれかの発明において、通常時は、前記電力系統に前記大容量蓄電池のみを接続することに代えて、前記大容量蓄電池に加え、前記充電用リチウム電池あるいは前記放電用リチウム電池も接続されることを特徴とする。 A storage battery system according to a fifth aspect of the present invention is the storage battery system according to any one of the first to sixth aspects, in addition to connecting the high-capacity storage battery only to the power system in a normal state. The charging lithium battery or the discharging lithium battery is also connected.

請求項1の発明によれば、通常時は系統負荷制御に応じて大容量蓄電池に充放電し、電力系統の負荷変動により急速充電が必要となったときは充電用リチウム電池に充電し、電力系統の負荷変動により急速放電が必要となったときは放電用リチウム電池から電力系統に放電するので、大容量電池を有効活用しながら、充放電双方の応答特性を改善できる。   According to the first aspect of the present invention, the high-capacity storage battery is normally charged / discharged according to the system load control, and when the rapid charge is required due to the load fluctuation of the power system, the charging lithium battery is charged, When rapid discharge is required due to system load fluctuation, the discharge lithium battery discharges to the power system, so that the response characteristics of both charge and discharge can be improved while effectively using a large capacity battery.

請求項2の発明によれば、電力系統の負荷変動により急速放電が必要となったときは、放電用リチウム電池から電力系統に電力を放電する放電制御を行い、充電用リチウム電池に大容量蓄電池から電力を充電する充電制御を行い、放電用リチウム電池が放電停止となったときは充電用リチウム電池と放電用リチウム電池とを入れ替えるので、放電用リチウム電池の容量を越えた急速放電が必要となった場合であっても、その急速放電に対応できる。   According to the second aspect of the present invention, when rapid discharge is required due to load fluctuation of the power system, discharge control is performed to discharge power from the discharge lithium battery to the power system, and the large capacity storage battery is added to the charge lithium battery. When the discharge lithium battery stops discharging, the charge lithium battery and the discharge lithium battery are replaced, so rapid discharge exceeding the capacity of the discharge lithium battery is required. Even if it becomes, it can respond to the rapid discharge.

請求項3の発明によれば、電力系統の負荷変動により急速充電が必要となったときは、充電用リチウム電池に電力系統からの電力を充電する充電制御を行い、放電用リチウム電池から大容量蓄電池に電力を放電する放電制御を行い、充電用リチウム電池が充電停止となったときは充電用リチウム電池と放電用リチウム電池とを入れ替えるので、充電用リチウム電池の容量を越えた急速充電が必要となった場合であっても、その急速充電に対応できる。   According to the third aspect of the present invention, when quick charging is required due to load fluctuations in the power system, the charging control is performed to charge the power from the power system to the charging lithium battery. The battery is controlled to discharge power, and when the charging lithium battery stops charging, the charging lithium battery and the discharging lithium battery are replaced. Therefore, rapid charging exceeding the capacity of the charging lithium battery is required. Even if it becomes, it can respond to the quick charge.

請求項4の発明によれば、電力系統の負荷変動により急速放電が必要となったときは、放電用リチウム電池から電力系統に電力を放電する放電制御を行い、段階的に異なる所定の充電用充電深度に維持された複数の充電用リチウム電池に大容量蓄電池からの電力をそれぞれ充電停止となるまで充電する充電制御を行い、また、放電用リチウム電池が放電停止となったときは順次充電停止となった充電用リチウム電池を放電用とするので、放電用リチウム電池の容量を越えた急速放電が必要となった場合であっても、その急速放電に対応できる。また、充電速度が放電速度より遅いリチウム電池の場合であっても充放電制御を円滑に行うことができる。   According to the invention of claim 4, when rapid discharge is required due to load fluctuations in the power system, discharge control is performed to discharge power from the discharge lithium battery to the power system, and the predetermined charging for different steps is performed. Charge control is performed to charge multiple lithium batteries for charging maintained at the charging depth until the power from the large-capacity storage battery stops charging, and when the discharging lithium battery stops discharging, charging is stopped sequentially Since the resulting charging lithium battery is used for discharging, even when rapid discharge exceeding the capacity of the discharging lithium battery is required, the rapid discharge can be handled. Moreover, even in the case of a lithium battery whose charging rate is slower than the discharging rate, charge / discharge control can be performed smoothly.

請求項5の発明によれば、電力系統の負荷変動により急速充電が必要となったときは、段階的に異なる所定の充電用充電深度に維持された複数の充電用リチウム電池に電力系統からの電力を充電する充電制御を行い、放電用リチウム電池から大容量蓄電池に電力を放電する放電制御を行い、充電用リチウム電池が充電停止となったときは順次放電用のリチウム電池とするので、充電用リチウム電池の容量を越えた急速充電が必要となった場合であっても、その急速充電に対応できる。また、充電速度が放電速度より遅い場合であっても充放電制御を円滑に行うことができる。   According to the invention of claim 5, when rapid charging is required due to load fluctuations in the power system, a plurality of charging lithium batteries maintained at predetermined charging depths that are stepwise different from the power system Charge control is performed to charge power, and discharge control is performed to discharge power from the discharge lithium battery to the high-capacity storage battery. When the charge lithium battery stops charging, the battery is sequentially discharged. Even when a quick charge exceeding the capacity of the lithium battery is required, the quick charge can be accommodated. Moreover, even when the charging rate is slower than the discharging rate, the charge / discharge control can be performed smoothly.

請求項6の発明によれば、大容量蓄電池はNAS電池または中古リチウム電池であるので、大容量蓄電池を安価に構成できる。 According to the invention of claim 6, since the large capacity storage battery is a NAS battery or a used lithium battery, the large capacity storage battery can be constructed at low cost.

請求項7の発明によれば、通常時にもリチウム電池の容量を有効活用できる。 According to the seventh aspect of the invention, the capacity of the lithium battery can be effectively utilized even during normal times.

本発明の実施形態に係る蓄電池システムの構成図。 The block diagram of the storage battery system which concerns on embodiment of this invention. 本発明の実施形態に係る蓄電池システムの通常運転時の構成図。 The block diagram at the time of normal operation of the storage battery system which concerns on embodiment of this invention. 本発明の実施形態に係る蓄電池システムの急速放電運転時の状態を示す構成図。 The block diagram which shows the state at the time of the rapid discharge driving | operation of the storage battery system which concerns on embodiment of this invention. 本発明の実施形態に係る蓄電池システムの急速放電運転時の充電用リチウム電池及び放電用リチウム電池の充電深度の変化を示すグラフ。 The graph which shows the change of the charge depth of the lithium battery for charge at the time of the rapid discharge driving | operation of the storage battery system which concerns on embodiment of this invention, and the lithium battery for discharge. 本発明の実施形態に係る蓄電池システムの急速充電運転時の状態を示す構成図。 The block diagram which shows the state at the time of the quick charge driving | operation of the storage battery system which concerns on embodiment of this invention. 本発明の実施形態に係る蓄電池システムの急速充電運転時の充電用リチウム電池及び放電用リチウム電池の充電深度の変化を示すグラフ。 The graph which shows the change of the charge depth of the lithium battery for charge at the time of the quick charge driving | operation of the storage battery system which concerns on embodiment of this invention, and the lithium battery for discharge. 本発明の他の実施形態に係る蓄電池システムの構成図。 The block diagram of the storage battery system which concerns on other embodiment of this invention. 本発明の他の実施形態に係る蓄電池システムの急速放電運転時の充電用リチウム電池及び放電用リチウム電池の充電深度の変化を示すグラフ。The graph which shows the change of the charge depth of the lithium battery for charge at the time of the rapid discharge operation of the storage battery system which concerns on other embodiment of this invention, and the lithium battery for discharge. 本発明の他の実施形態に係る蓄電池システムの急速充電運転時の充電用リチウム電池及び放電用リチウム電池の充電深度の変化を示すグラフ。 The graph which shows the change of the charge depth of the lithium battery for charge at the time of the quick charge driving | operation of the storage battery system which concerns on other embodiment of this invention, and the lithium battery for discharge.

以下、本発明の実施形態を説明する。図1は本発明の実施形態に係る蓄電池システムの構成図である。 Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a storage battery system according to an embodiment of the present invention.

電力系統11には電力変換器12aを介して大容量蓄電池13が接続されている。電力変換器12aは交直変換器であり、電力系統11からの交流を直流に変換して大容量蓄電池13に充電するとともに、大容量蓄電池13に蓄電された電力を交流に変換して電力系統に供給する。   A large capacity storage battery 13 is connected to the power system 11 via a power converter 12a. The power converter 12a is an AC / DC converter that converts alternating current from the power system 11 into direct current and charges the large capacity storage battery 13, and converts the power stored in the large capacity storage battery 13 into alternating current to convert the power into the power system. Supply.

大容量蓄電池13はNAS電池または中古リチウム電池で構成されている。NAS電池は大容量で放電速度も速く低価格であるという特徴を有し、また、中古リチウム電池は充電容量が大きく新品のリチウム電池より充放電速度が遅いが低価格であるという特徴を有する。従って、電力系統11の通常の負荷変動に応じて余剰電力を充電したり蓄電した電力を電力系統11に放電するには適した蓄電池である。   The large capacity storage battery 13 is composed of a NAS battery or a used lithium battery. A NAS battery has a feature that it has a large capacity, a high discharge rate, and a low price, and a used lithium battery has a feature that it has a large charge capacity and a charge / discharge rate that is slower than a new lithium battery, but is inexpensive. Therefore, the storage battery is suitable for charging the surplus power according to the normal load fluctuation of the power system 11 or discharging the stored power to the power system 11.

また、電力系統11には、電力変換器12b及び接続切替装置14を介して充電用リチウム電池15及び放電用リチウム電池16が接続されている。電力変換器12bは交直変換器であり、電力系統11からの交流を直流に変換して充電用リチウム電池15に充電するとともに、放電用リチウム電池16に蓄電された電力を交流に変換して電力系統11に供給する。   In addition, a charging lithium battery 15 and a discharging lithium battery 16 are connected to the power system 11 via a power converter 12 b and a connection switching device 14. The power converter 12b is an AC / DC converter that converts alternating current from the power system 11 into direct current to charge the charging lithium battery 15 and converts the electric power stored in the discharging lithium battery 16 into alternating current. Supply to system 11.

リチウム電池は高価格であるが充放電速度が速く急速充放電に適しているので、2個のリチウム電池を用意し、一方を充電用リチウム電池15とし、他方を放電用リチウム電池16として使用する。充電用リチウム電池15は、常時は充電深度SOCが50%未満の所定の充電用充電深度、例えば10%〜30%に維持され、電力系統11の負荷が急に減少し電力系統11の電力が急に増大した場合に、電力系統11からの電力を急速充電できるように待機している。同様に、放電用リチウム電池16は、常時は充電深度SOCが50%を超える所定の充電用充電深度、例えば80%〜100%に維持され、電力系統11の負荷が急に増大し電力系統11の電力が急に減少した場合に、電力系統11に電力を急速放電できるように待機している。 Since the lithium battery is expensive but has a high charge / discharge rate and is suitable for rapid charge / discharge, two lithium batteries are prepared, one being used as the charge lithium battery 15 and the other being used as the discharge lithium battery 16. . The charging lithium battery 15 is normally maintained at a predetermined charging charging depth with a charging depth SOC of less than 50%, for example, 10% to 30%, the load of the power system 11 is suddenly reduced, and the power of the power system 11 is reduced. When suddenly increasing, it is waiting so that the electric power from the electric power grid | system 11 can be charged quickly. Similarly, the discharge lithium battery 16 is always maintained at a predetermined charge depth of charge exceeding 50%, for example, 80% to 100%, and the load of the power system 11 suddenly increases to increase the power system 11. When the power of the power supply suddenly decreases, the power system 11 is on standby so that the power can be quickly discharged.

また、大容量蓄電池13と、充電用リチウム電池15及び放電用リチウム電池16とは、電力変換器12c及び接続切替装置14を介して接続されている。電力変換器12cは直流・直流変換器であり、放電用リチウム電池16が電力系統11に電力を供給しているときは、大容量蓄電池13からの直流を充電用リチウム電池15に充電するとともに、充電用リチウム電池15が電力系統11から電力を蓄電しているときは、放電用リチウム電池16に蓄電された電力を大容量蓄電池13に充電する。   The large-capacity storage battery 13 is connected to the charging lithium battery 15 and the discharging lithium battery 16 via the power converter 12 c and the connection switching device 14. The power converter 12c is a direct current / direct current converter, and when the discharging lithium battery 16 supplies power to the power system 11, the charging lithium battery 15 is charged with the direct current from the large-capacity storage battery 13, and When the charging lithium battery 15 is storing electric power from the power system 11, the electric power stored in the discharging lithium battery 16 is charged into the large-capacity storage battery 13.

これにより、放電用リチウム電池16が放電してその充電深度SOCが例えば10%〜30%になったときは充電用リチウム電池15となり、同様に、充電用リチウム電池15に蓄電されその充電深度SOCが例えば80%〜100%になったときは放電用リチウム電池16となる。すなわち、充電用リチウム電池15と放電用リチウム電池16との入れ替えが行われる。   As a result, when the discharge lithium battery 16 is discharged and the charge depth SOC becomes 10% to 30%, for example, the charge lithium battery 15 is obtained. Similarly, the charge lithium battery 15 is charged and charged with the charge depth SOC. When, for example, 80% to 100%, the discharge lithium battery 16 is obtained. That is, the charging lithium battery 15 and the discharging lithium battery 16 are exchanged.

接続切替装置14は、制御装置17からの指令に基づき、大容量蓄電池13、充電用リチウム電池15、放電用リチウム電池16の接続切替を行うものである。制御装置17は、通常時は大容量蓄電池13を電力系統11に接続し、電力系統11の通常の負荷変動に応じて、電力変換器12aに指令を出力して電力系統11から余剰電力を大容量蓄電池13に充電したり、電力変換器12bに指令を出力して大容量蓄電池13から電力を電力系統11に放電したりする。   The connection switching device 14 performs connection switching of the large-capacity storage battery 13, the charging lithium battery 15, and the discharging lithium battery 16 based on a command from the control device 17. The control device 17 normally connects the large-capacity storage battery 13 to the power system 11, outputs a command to the power converter 12 a in accordance with a normal load fluctuation of the power system 11, and increases excess power from the power system 11. The capacity storage battery 13 is charged, or a command is output to the power converter 12b to discharge power from the large capacity storage battery 13 to the power system 11.

そして、電力系統11の負荷変動により急速充電が必要となったときは、制御装置17は、充電用リチウム電池15を電力系統11に接続するとともに、放電用リチウム電池16を大容量蓄電池13に接続して、電力変換器12bに指令を出力して充電用リチウム電池15に電力系統11の過剰電力を充電し、電力変換器12cに指令を出力して放電用リチウム電池16の電力を大容量蓄電池13に放電する。   When rapid charging is required due to load fluctuations in the power system 11, the control device 17 connects the charging lithium battery 15 to the power system 11 and connects the discharging lithium battery 16 to the large-capacity storage battery 13. Then, a command is output to the power converter 12b, the charging lithium battery 15 is charged with excess power of the power system 11, and a command is output to the power converter 12c so that the power of the discharging lithium battery 16 is stored in the large capacity storage battery. 13 is discharged.

同様に、電力系統11の負荷変動により急速放電が必要となったときは、制御装置17は、放電用リチウム電池16を電力系統11に接続するとともに、充電用リチウム電池15を大容量蓄電池13に接続して、電力変換器12bに指令を出力して放電用リチウム電池16から電力系統11に放電し、電力変換器12cに指令を出力して大容量蓄電池13から充電用リチウム電池15に電力を充電する。   Similarly, when rapid discharge is required due to load fluctuations in the power system 11, the control device 17 connects the discharging lithium battery 16 to the power system 11 and also connects the charging lithium battery 15 to the large capacity storage battery 13. Connected, outputs a command to the power converter 12b and discharges from the discharge lithium battery 16 to the power system 11, outputs a command to the power converter 12c and supplies power from the large capacity storage battery 13 to the charging lithium battery 15 Charge.

図2は本発明の実施形態に係る蓄電池システムの通常運転時の状態を示す構成図である。通常運転時においては、制御装置17は接続切替装置14のスイッチS1をオンして大容量蓄電池13を電力系統11に接続し、スイッチS2〜S5をオフして充電用リチウム電池15及び放電用リチウム電池16を電力系統11及び大容量蓄電池13から切り離す。そして、制御装置17は、電力系統11の通常の負荷変動に応じて、電力変換器12aに指令を出力して大容量蓄電池13の充放電制御を行う。電力系統11に余剰電力がある場合には電力系統11から余剰電力を大容量蓄電池13に充電し、電力系統11の電力が不足したときは大容量蓄電池13から電力系統11に電力を放電する。   FIG. 2 is a configuration diagram illustrating a state during normal operation of the storage battery system according to the embodiment of the present invention. During normal operation, the control device 17 turns on the switch S1 of the connection switching device 14 to connect the large-capacity storage battery 13 to the power system 11, turns off the switches S2 to S5, and turns on the charging lithium battery 15 and the discharging lithium. The battery 16 is disconnected from the power system 11 and the large-capacity storage battery 13. And the control apparatus 17 outputs instruction | command to the power converter 12a according to the normal load fluctuation | variation of the electric power grid | system 11, and performs charging / discharging control of the large capacity storage battery 13. FIG. When there is surplus power in the power system 11, the surplus power is charged from the power system 11 to the large capacity storage battery 13, and when the power of the power system 11 is insufficient, the power is discharged from the large capacity storage battery 13 to the power system 11.

図3は本発明の実施形態に係る蓄電池システムの急速放電運転時の状態を示す構成図である。電力系統11の負荷変動により、通常運転時の状態から電力系統11への急速放電が必要となったときは、制御装置17は、接続切替装置14のスイッチS1をオフし大容量蓄電池13を電力系統11から切り離すとともに、スイッチS3をオンして放電用リチウム電池16を電力系統11に接続し、スイッチS4をオンして充電用リチウム電池15を大容量電池13に接続する。 FIG. 3 is a configuration diagram illustrating a state during a rapid discharge operation of the storage battery system according to the embodiment of the present invention. When a rapid discharge from the state during normal operation to the power system 11 is necessary due to a load fluctuation of the power system 11, the control device 17 turns off the switch S <b> 1 of the connection switching device 14 to power the large capacity storage battery 13. While disconnecting from the system 11, the switch S3 is turned on to connect the discharging lithium battery 16 to the power system 11, and the switch S4 is turned on to connect the charging lithium battery 15 to the large capacity battery 13.

そして、制御装置17は、電力変換器12bに指令を出力して、放電用リチウム電池16から電力系統11に電力を放電する放電制御を行う。また、制御装置17は、電力変換器12cに指令を出力して、大容量蓄電池13から充電用リチウム電池15に電力を充電する充電制御を行う。   Then, the control device 17 outputs a command to the power converter 12 b and performs discharge control for discharging power from the discharge lithium battery 16 to the power system 11. Further, the control device 17 outputs a command to the power converter 12 c and performs charge control for charging power from the large-capacity storage battery 13 to the charging lithium battery 15.

図4は本発明の実施形態に係る蓄電池システムの急速放電運転時の充電用リチウム電池15及び放電用リチウム電池16の充電深度SOCの変化を示すグラフである。いま、時点t1で電力系統11への急速放電が必要となったとする。放電用として待機していた放電用リチウム電池16は、時点t1から電力系統11に放電を開始する。一方、充電用として待機していた充電用リチウム電池15は、時点t1から大容量蓄電池13から充電を開始する。これにより、放電用リチウム電池16の充電深度は降下し、充電用リチウム電池15の充電深度は上昇する。   FIG. 4 is a graph showing changes in the charging depth SOC of the charging lithium battery 15 and the discharging lithium battery 16 during the rapid discharge operation of the storage battery system according to the embodiment of the present invention. Now, assume that rapid discharge to the power system 11 is required at time t1. The discharging lithium battery 16 waiting for discharging starts discharging to the power system 11 from time t1. On the other hand, the charging lithium battery 15 waiting for charging starts charging from the large-capacity storage battery 13 from time t1. As a result, the charging depth of the discharging lithium battery 16 decreases and the charging depth of the charging lithium battery 15 increases.

そして、時点t2で放電用リチウム電池16が放電停止電圧となり放電停止となると、放電用リチウム電池16と充電用リチウム電池15とを入れ替える。すなわち、時点t2以降は、それまで充電用リチウム電池15であったリチウム電池が放電用リチウム電池16となる。この場合、接続切替装置14は、時点t2でスイッチS2をオフからオンに、スイッチS3をオンからオフに、スイッチS4をオンからオフに、スイッチS5をオフからオンに切り替える。以下同様に、時点3において、放電用リチウム電池16が放電停止となると、放電用リチウム電池16と充電用リチウム電池15とを入れ替える。   Then, when the discharge lithium battery 16 becomes the discharge stop voltage and stops the discharge at time t2, the discharge lithium battery 16 and the charge lithium battery 15 are switched. That is, after time t2, the lithium battery that has been the charging lithium battery 15 becomes the discharging lithium battery 16. In this case, the connection switching device 14 switches the switch S2 from off to on, the switch S3 from on to off, the switch S4 from on to off, and the switch S5 from off to on at time t2. Similarly, at time 3, when the discharge lithium battery 16 stops discharging, the discharge lithium battery 16 and the charge lithium battery 15 are switched.

このように、放電用リチウム電池16が放電停止となったときは、充電用リチウム電池15と放電用リチウム電池16とを入れ替えて放電制御を継続するので、放電用リチウム電池16の容量を越えた急速放電が必要となった場合であっても、その急速放電に対応できる。   Thus, when the discharge lithium battery 16 stops discharging, the charge lithium battery 15 and the discharge lithium battery 16 are replaced and the discharge control is continued, so that the capacity of the discharge lithium battery 16 is exceeded. Even when rapid discharge is required, the rapid discharge can be handled.

図5は本発明の実施形態に係る蓄電池システムの急速充電運転時の状態を示す構成図である。電力系統11の負荷変動により、通常運転時の状態から電力系統11からの急速充電が必要となったときは、制御装置17は、接続切替装置14のスイッチS1をオフし大容量蓄電池13を電力系統11から切り離すとともに、スイッチS2をオンして充電用リチウム電池15を電力系統11に接続し、スイッチS5をオンして放電用リチウム電池16を大容量電池13に接続する。 FIG. 5 is a configuration diagram illustrating a state of the storage battery system according to the embodiment of the present invention during a quick charge operation. When rapid charging from the power system 11 becomes necessary from the state during normal operation due to load fluctuations in the power system 11, the control device 17 turns off the switch S <b> 1 of the connection switching device 14 to power the large capacity storage battery 13. While disconnecting from the system 11, the switch S2 is turned on to connect the charging lithium battery 15 to the power system 11, and the switch S5 is turned on to connect the discharging lithium battery 16 to the large capacity battery 13.

そして、制御装置17は、電力変換器12bに指令を出力して、充電用リチウム電池15に電力系統11から電力を充電する充電制御を行う。また、制御装置17は、電力変換器12cに指令を出力して、放電用リチウム電池16から大容量蓄電池13に電力を放電する放電制御を行う。   And the control apparatus 17 outputs instruction | command to the power converter 12b, and performs charge control which charges the lithium battery 15 for charge from the electric power grid | system 11. FIG. In addition, the control device 17 outputs a command to the power converter 12 c to perform discharge control for discharging power from the discharge lithium battery 16 to the large-capacity storage battery 13.

図6は本発明の実施形態に係る蓄電池システムの急速充電運転時の充電用リチウム電池15及び放電用リチウム電池16の充電深度SOCの変化を示すグラフである。いま、時点t1で電力系統11からの急速充電が必要となったとする。充電用として待機していた充電用リチウム電池15は、時点t1から電力系統11からの電力の充電を開始する。一方、放電用として待機していた放電用リチウム電池16は、時点t1から大容量蓄電池13に放電を開始する。これにより、充電用リチウム電池15の充電深度は上昇し、放電用リチウム電池16の充電深度は降下する。   FIG. 6 is a graph showing changes in the charging depth SOC of the charging lithium battery 15 and the discharging lithium battery 16 during the rapid charging operation of the storage battery system according to the embodiment of the present invention. Now, assume that quick charging from the power system 11 is required at time t1. The charging lithium battery 15 waiting for charging starts charging power from the power system 11 from time t1. On the other hand, the discharging lithium battery 16 waiting for discharging starts discharging to the large-capacity storage battery 13 from time t1. As a result, the charging depth of the charging lithium battery 15 increases and the charging depth of the discharging lithium battery 16 decreases.

そして、時点t2で充電用リチウム電池15が充電停止電圧となり充電停止となると、充電用リチウム電池15と放電用リチウム電池16とを入れ替える。すなわち、時点t2以降は、それまでリチウム電池が放電用リチウム電池16であった充電用リチウム電池15となる。   When the charging lithium battery 15 becomes the charging stop voltage and stops charging at time t2, the charging lithium battery 15 and the discharging lithium battery 16 are switched. That is, after the time point t2, the lithium battery becomes the charging lithium battery 15 that has been the discharging lithium battery 16 until then.

この場合、接続切替装置14は、時点t2でスイッチS2をオンからオフに、スイッチS3をオフからオンに、スイッチS4をオフからオンに、スイッチS5をオンからオフに切り替える。以下同様に、時点3において、充電用リチウム電池15が充電停止となると、放電用リチウム電池16と充電用リチウム電池15とが入れ替えられる。   In this case, the connection switching device 14 switches the switch S2 from on to off, the switch S3 from off to on, the switch S4 from off to on, and the switch S5 from on to off at time t2. Similarly, at the time 3, when the charging lithium battery 15 stops charging, the discharging lithium battery 16 and the charging lithium battery 15 are switched.

このように、充電用リチウム電池15が充電停止となったときは充電用リチウム電池15と放電用リチウム電池16とを入れ替えて充電制御を継続するので、
充電用リチウム電池15の容量を越えた急速充電が必要となった場合であっても、その急速充電に対応できる。
In this way, when the charging lithium battery 15 is stopped charging, the charging lithium battery 15 and the discharging lithium battery 16 are exchanged and the charging control is continued.
Even when rapid charging exceeding the capacity of the charging lithium battery 15 is required, the rapid charging can be accommodated.

次に、本発明の他の実施形態を説明する。図7は本発明の他の実施形態に係る蓄電池システムの構成図である。この他の実施形態は、図1に示した実施形態に対し、充電用リチウム電池15として複数の充電用リチウム電池15a、15b、15cを有し、複数の充電用リチウム電池15a、15b、15cは、段階的に異なる所定の充電用充電深度に維持しておき、電力系統11の負荷変動により急速放電が必要となったときは、放電用リチウム電池16を電力系統11に接続するとともに、複数の充電用リチウム電池15a、15b、15cを大容量蓄電池13に接続し、一方、電力系統の負荷変動により急速充電が必要となったときは、複数の充電用リチウム電池15a、15b、15cを電力系統11に接続するとともに、放電用リチウム電池16を大容量蓄電池13に接続するようにしたものである。これは、一般に、多くの蓄電池は充電速度が遅く放電速度が速いことに対処するためである。   Next, another embodiment of the present invention will be described. FIG. 7 is a configuration diagram of a storage battery system according to another embodiment of the present invention. This other embodiment has a plurality of charging lithium batteries 15a, 15b, 15c as the charging lithium battery 15 with respect to the embodiment shown in FIG. 1, and the plurality of charging lithium batteries 15a, 15b, 15c are When a rapid discharge is required due to load fluctuations of the power system 11 while maintaining a predetermined charging depth that varies stepwise, the discharge lithium battery 16 is connected to the power system 11 and a plurality of When the charging lithium batteries 15a, 15b, 15c are connected to the large-capacity storage battery 13 and rapid charging is required due to load fluctuations in the power system, the charging lithium batteries 15a, 15b, 15c are connected to the power system. 11 and the discharge lithium battery 16 are connected to the large-capacity storage battery 13. This is to cope with the fact that many storage batteries generally have a low charge rate and a high discharge rate.

図7において、充電用リチウム電池15a〜15cは、常時は充電深度SOCが段階的に異なる所定の充電用充電深度、例えば、10%〜30%、30%〜50%、50%〜70%に維持され、電力系統11の負荷が急に増大した場合に、電力系統11からの電力を急速充電できるように待機している。同様に、放電用リチウム電池16は、常時は充電深度SOCが50%を超える所定の充電用充電深度、例えば80%〜100%に維持され、電力系統11の負荷が急に減少した場合に、電力系統11に電力を急速放電できるように待機している。充電リチウム電池15a〜15c及び放電用リチウム電池16は、いずれも充電速度が遅く放電速度が速い同じ特性のリチウム電池を用いている。   In FIG. 7, the charging lithium batteries 15 a to 15 c are normally set to predetermined charging depths in which the charging depth SOC varies stepwise, for example, 10% to 30%, 30% to 50%, 50% to 70%. When the load of the electric power system 11 is suddenly increased, the electric power from the electric power system 11 is on standby so that the electric power can be rapidly charged. Similarly, the discharge lithium battery 16 is normally maintained at a predetermined charge depth for charge exceeding 50%, for example, 80% to 100%, and the load on the power system 11 is suddenly reduced. The power system 11 is on standby so that power can be rapidly discharged. The charging lithium batteries 15a to 15c and the discharging lithium battery 16 are all lithium batteries having the same characteristics with a low charging speed and a high discharging speed.

電力系統11の負荷変動により、通常運転状態から急速放電が必要となったときは、制御装置17は、接続切替装置14のスイッチS1をオフし、大容量蓄電池13を電力系統11から切り離すとともに、スイッチS3をオンにして放電用リチウム電池16を電力系統11に接続し、スイッチS4a〜S4cをオンして充電用リチウム電池15を大容量電池13に接続する。   When rapid discharge is required from the normal operation state due to load fluctuation of the power system 11, the control device 17 turns off the switch S1 of the connection switching device 14 and disconnects the large-capacity storage battery 13 from the power system 11, The switch S3 is turned on to connect the discharging lithium battery 16 to the power system 11, and the switches S4a to S4c are turned on to connect the charging lithium battery 15 to the large capacity battery 13.

そして、制御装置17は、電力変換器12bに指令を出力して、放電用リチウム電池16から電力系統11に電力を放電する放電制御を行う。また、制御装置17は、電力変換器12cに指令を出力して、大容量蓄電池13から充電用リチウム電池15a〜15cに電力を充電する充電制御を行う。   Then, the control device 17 outputs a command to the power converter 12 b and performs discharge control for discharging power from the discharge lithium battery 16 to the power system 11. Moreover, the control apparatus 17 outputs instruction | command to the power converter 12c, and performs charge control which charges electric power from the large capacity storage battery 13 to the lithium batteries 15a-15c for charge.

図8は本発明の他の実施形態に係る蓄電池システムの急速放電運転時の充電用リチウム電池15a〜15c及び放電用リチウム電池16の充電深度SOCの変化を示すグラフである。いま、時点t1で電力系統11への急速放電が必要となったとする。放電用として待機していた放電用リチウム電池16は、時点t1から電力系統11に放電を開始する。一方、充電用として待機していた充電用リチウム電池15a〜15cは、時点t1から大容量蓄電池13から充電を開始する。これにより、放電用リチウム電池16の充電深度は降下し、充電用リチウム電池15a〜15cの充電深度は上昇する。この場合、充電深度が50%〜70%と高く維持されていた充電用リチウム電池15cが最も早く時点t2で充電停止電圧となり充電を停止し、充電用リチウム電池15b、15aの順に時点t3、t4で充電停止電圧となり充電を停止する。   FIG. 8 is a graph showing changes in the charging depth SOC of the charging lithium batteries 15a to 15c and the discharging lithium battery 16 during the rapid discharge operation of the storage battery system according to another embodiment of the present invention. Now, assume that rapid discharge to the power system 11 is required at time t1. The discharging lithium battery 16 waiting for discharging starts discharging to the power system 11 from time t1. On the other hand, the charging lithium batteries 15a to 15c that have been on standby for charging start charging from the large-capacity storage battery 13 from time t1. As a result, the charging depth of the discharging lithium battery 16 decreases, and the charging depth of the charging lithium batteries 15a to 15c increases. In this case, the charging lithium battery 15c whose charging depth has been maintained as high as 50% to 70% becomes the charging stop voltage earliest at time t2 and stops charging, and the charging lithium batteries 15b and 15a are sequentially timed t3, t4. The charge stop voltage becomes and stops charging.

そして、時点t2で放電用リチウム電池16が放電停止電圧となり放電停止となると、放電用リチウム電池16と充電用リチウム電池15cとを入れ替える。すなわち、時点t2以降は、それまで充電用リチウム電池15cであったリチウム電池が放電用リチウム電池となり、放電用リチウム電池16が充電用のリチウム電池となる。   Then, when the discharge lithium battery 16 becomes the discharge stop voltage and stops the discharge at time t2, the discharge lithium battery 16 and the charge lithium battery 15c are switched. That is, after time t2, the lithium battery that has been the charging lithium battery 15c until then becomes a discharging lithium battery, and the discharging lithium battery 16 becomes a charging lithium battery.

この場合、接続切替装置14は、時点t2でスイッチS2aをオフからオンに、スイッチS3をオンからオフに、スイッチS4aをオンからオフに、スイッチS5をオフからオンに切り替える。   In this case, the connection switching device 14 switches the switch S2a from off to on, the switch S3 from on to off, the switch S4a from on to off, and the switch S5 from off to on at time t2.

以下同様に、時点3において、放電用となったリチウム電池15cが放電停止となると、そのリチウム電池15cを充電用とし、充電用リチウム電池15bを放電用とする入れ替えを行い、時点4において、放電用となったリチウム電池15bが放電停止となると、そのリチウム電池15bを充電用とし充電用リチウム電池15aを放電用とする入れ替えを行う。   Similarly, when the discharge of the lithium battery 15c for discharge is stopped at time 3, the lithium battery 15c is replaced for charge and the charge lithium battery 15b is discharged for discharge. When the used lithium battery 15b stops discharging, the lithium battery 15b is replaced for charging and the charging lithium battery 15a for discharging is replaced.

充電用リチウム電池15a〜15c及び放電用リチウム電池16は、いずれも充電速度が遅く放電速度が速い同じ特性のリチウム電池を用いているので、以下、時点t5〜t9において、充電用と放電用との入れ替えを行って、電力系統11への急速放電が必要なくなるまで、急速放電運転を継続する。   Since each of the charging lithium batteries 15a to 15c and the discharging lithium battery 16 uses a lithium battery having the same characteristics with a slow charging speed and a high discharging speed, the charging and discharging are performed at time points t5 to t9. The rapid discharge operation is continued until the rapid discharge to the power system 11 is not necessary.

次に、電力系統11の負荷変動により、通常運転時の状態から電力系統11からの急速充電が必要となったときは、制御装置17は、接続切替装置14のスイッチS1をオフし大容量蓄電池13を電力系統11から切り離すとともに、スイッチS2a〜S2cをオンして充電用リチウム電池15a〜15cを電力系統11に接続し、スイッチS5をオンして放電用リチウム電池16を大容量電池13に接続する。 Next, when a rapid charge from the power system 11 is necessary from the state during normal operation due to a load fluctuation of the power system 11, the control device 17 turns off the switch S1 of the connection switching device 14 to store the large capacity storage battery. 13 is disconnected from the power system 11, the switches S2a to S2c are turned on to connect the charging lithium batteries 15a to 15c to the power system 11, and the switch S5 is turned on to connect the discharging lithium battery 16 to the large capacity battery 13. To do.

そして、制御装置17は、電力変換器12bに指令を出力して、充電用リチウム電池15に電力系統11から電力を充電する充電制御を行う。また、制御装置17は、電力変換器12cに指令を出力して、放電用リチウム電池16から大容量蓄電池13に電力を放電する放電制御を行う。   And the control apparatus 17 outputs instruction | command to the power converter 12b, and performs charge control which charges the lithium battery 15 for charge from the electric power grid | system 11. FIG. In addition, the control device 17 outputs a command to the power converter 12 c to perform discharge control for discharging power from the discharge lithium battery 16 to the large-capacity storage battery 13.

図9は本発明の他の実施形態に係る蓄電池システムの急速充電運転時の充電用リチウム電池15a〜15c及び放電用リチウム電池16の充電深度SOCの変化を示すグラフである。いま、時点t1で電力系統11からの急速充電が必要となったとする。充電用として待機していた充電用リチウム電池15a〜15cは、時点t1から電力系統11から充電を開始する。一方、放電用として待機していた放電用リチウム電池16は、時点t1から大容量蓄電池13に放電を開始する。これにより、放電用リチウム電池16の充電深度は降下し、充電用リチウム電池15a〜15cの充電深度は上昇する。この場合、充電深度が50%〜70%と高く維持されていた充電用リチウム電池15cが最も早く時点t2で充電停止電圧となり充電を停止し、充電用リチウム電池15b、15aの順に時点t3、t4で充電停止電圧となり充電を停止する。   FIG. 9 is a graph showing changes in the charging depth SOC of the charging lithium batteries 15a to 15c and the discharging lithium battery 16 during the rapid charging operation of the storage battery system according to another embodiment of the present invention. Now, assume that quick charging from the power system 11 is required at time t1. The charging lithium batteries 15a to 15c that have been waiting for charging start charging from the power system 11 from time t1. On the other hand, the discharging lithium battery 16 waiting for discharging starts discharging to the large-capacity storage battery 13 from time t1. As a result, the charging depth of the discharging lithium battery 16 decreases, and the charging depth of the charging lithium batteries 15a to 15c increases. In this case, the charging lithium battery 15c whose charging depth has been maintained as high as 50% to 70% becomes the charging stop voltage earliest at time t2 and stops charging, and the charging lithium batteries 15b and 15a are sequentially timed t3, t4. The charge stop voltage becomes and stops charging.

そして、時点t2で充電深度が50%〜70%と高く維持されていた充電用リチウム電池15cが充電停止電圧となり充電停止となると、充電用リチウム電池15cと放電用リチウム電池16とを入れ替える。すなわち、時点t2以降は、それまで充電用リチウム電池15cであったリチウム電池が放電用リチウム電池となり、放電用リチウム電池16が充電用リチウム電池となる。   When the charging lithium battery 15c, which has been maintained at a high charging depth of 50% to 70% at time t2, becomes the charging stop voltage and the charging is stopped, the charging lithium battery 15c and the discharging lithium battery 16 are switched. That is, after time t2, the lithium battery that has been the charging lithium battery 15c until then becomes a discharging lithium battery, and the discharging lithium battery 16 becomes a charging lithium battery.

この場合、接続切替装置14は、時点t2でスイッチS2aをオンからオフに、スイッチS3をオフからオンに、スイッチS4aをオフからオンに、スイッチS5をオンからオフに切り替える。 In this case, the connection switching device 14 switches the switch S2a from on to off, the switch S3 from off to on, the switch S4a from off to on, and the switch S5 from on to off at time t2.

以下同様に、時点3において、充電用リチウム電池15bが充電停止となると、
そのリチウム電池15bを放電用とし、充電用リチウム電池15cを充電用とする入れ替えを行う。 The lithium battery 15b is used for discharging, and the lithium battery 15c for charging is used for charging. 時点4において、放電用となったリチウム電池15bが放電停止となると、そのリチウム電池15bを充電用とし充電用リチウム電池15aを放電用とする入れ替えを行う。 When the lithium battery 15b used for discharging is stopped at the time point 4, the lithium battery 15b is replaced with the lithium battery 15b for charging and the lithium battery 15a for charging is used for discharging. Similarly, at the time 3, when the charging lithium battery 15b is stopped charging, Similarly, at the time 3, when the charging lithium battery 15b is stopped charging,
The lithium battery 15b is used for discharging and the charging lithium battery 15c is used for charging. When the lithium battery 15b for discharging is stopped at time 4, the lithium battery 15b is replaced for charging and the charging lithium battery 15a is replaced for discharging. The lithium battery 15b is used for similarly and the charging lithium battery 15c is used for charging. When the lithium battery 15b for efficiently is stopped at time 4, the lithium battery 15b is replaced for charging and the charging lithium battery 15a is replaced for efficiently. ..

充電用リチウム電池15a〜15c及び放電用リチウム電池16は、いずれも充電速度が遅く放電速度が速い同じ特性のリチウム電池を用いているので、以下、時点t5〜t9において、充電用と放電用との入れ替えを行って、電力系統11からの急速充電が必要なくなるまで、急速充電運転を継続する。   Since each of the charging lithium batteries 15a to 15c and the discharging lithium battery 16 uses a lithium battery having the same characteristics with a slow charging speed and a high discharging speed, the charging and discharging are performed at time points t5 to t9. The quick charge operation is continued until the quick charge from the power system 11 is not necessary.

本発明の他の実施形態によれば、電力系統11の負荷変動により急速放電が必要となったときは、放電用リチウム電池16から電力系統11に電力を放電する放電制御を行うので、即座に急速放電に対応できる。また、放電用リチウム電池16からの放電中に、段階的に異なる所定の充電用充電深度に維持された複数の充電用リチウム電池15a〜15bに大容量蓄電池13からの電力をそれぞれ充電するので、リチウム電池の充電速度が放電速度より遅い場合であっても、放電用リチウム電池16が放電停止となるまでの間に、いずれかの充電用リチウム電池15a〜15cを放電用とすることができる。従って、放電用リチウム電池16の容量を越えた急速放電が必要となった場合であっても、その急速放電に対応できる。   According to another embodiment of the present invention, when rapid discharge is required due to load fluctuations of the power system 11, the discharge control for discharging power from the discharge lithium battery 16 to the power system 11 is performed. Can handle rapid discharge. Further, during the discharge from the discharge lithium battery 16, the power from the large-capacity storage battery 13 is charged to each of the plurality of charge lithium batteries 15 a to 15 b maintained at a predetermined charge charge depth that varies in stages. Even when the charging speed of the lithium battery is slower than the discharging speed, any of the charging lithium batteries 15a to 15c can be used for discharging until the discharging lithium battery 16 stops discharging. Therefore, even when rapid discharge exceeding the capacity of the discharge lithium battery 16 is required, the rapid discharge can be handled.

また、電力系統11の負荷変動により急速充電が必要となったときは、段階的に異なる所定の充電用充電深度に維持された複数の充電用リチウム電池15a〜15cに電力系統11からの電力を充電する充電制御を行うので、即座に急速充電に対応できる。その複数の充電用リチウム電池15a〜15cに充電中に、放電用リチウム電池16から大容量蓄電池13に電力を放電する放電制御を行い、その放電用リチウム電池16を充電用としておけるので、充電用リチウム電池15a〜15cの容量を越えた急速充電が必要となった場合であっても、その急速充電に対応できる。   In addition, when rapid charging is required due to load fluctuations in the power system 11, the power from the power system 11 is supplied to the plurality of charging lithium batteries 15a to 15c maintained at predetermined charging depths that are different in stages. Since charging control is performed, quick charging can be handled immediately. During charging of the plurality of charging lithium batteries 15a to 15c, discharge control is performed to discharge power from the discharging lithium battery 16 to the large capacity storage battery 13, and the discharging lithium battery 16 can be used for charging. Even when rapid charging exceeding the capacity of the lithium batteries 15a to 15c is required, the rapid charging can be supported.

なお、通常時は、電力系統11に、大容量蓄電池13だけでなく充電用リチウム電池15あるいは放電用リチウム電池16も接続されるように構成してもよい。接続される充電用リチウム電池15あるいは放電用リチウム電池16の充電深度SOCは、所定の充電用充電深度あるいは所定の放電用充電深度の範囲で維持される。通常時もリチウム電池を電力系統11に接続することで、リチウム電池の容量を通常時にも有効活用できる。   In normal times, not only the large capacity storage battery 13 but also the charging lithium battery 15 or the discharging lithium battery 16 may be connected to the power system 11. The charging depth SOC of the connected charging lithium battery 15 or discharging lithium battery 16 is maintained within a predetermined charging charging depth or a predetermined discharging charging depth. By connecting the lithium battery to the power system 11 at normal times, the capacity of the lithium battery can be effectively utilized even at normal times.

11…電力系統、12…電力変換器、13…大容量蓄電池、14…接続切替装置、15…充電用リチウム電池、16…放電用リチウム電池、17…制御装置 DESCRIPTION OF SYMBOLS 11 ... Electric power system, 12 ... Power converter, 13 ... Mass storage battery, 14 ... Connection switching apparatus, 15 ... Lithium battery for charge, 16 ... Lithium battery for discharge, 17 ... Control apparatus

Claims (5)

  1. 電力系統の負荷変動に応じて余剰電力を充電するとともに不足電力を放電する大容量蓄電池と、
    待機状態で充電深度が50%未満の所定の充電用充電深度に維持され前記電力系統から電力を急速充電するための充電用リチウム電池と、
    待機状態で充電深度が50%を超える所定の放電用充電深度に維持され前記電力系統に電力を急速放電するための放電用リチウム電池と、
    通常時は前記大容量蓄電池のみを前記電力系統に接続し、前記電力系統の負荷変動により急速充電が必要となったときは充電用リチウム電池のみを電力系統に接続し、前記電力系統の負荷変動により急速放電が必要となったときは前記放電用リチウム電池のみを電力系統に接続する接続切替装置と、 Normally, only the large-capacity storage battery is connected to the power system, and when quick charging is required due to load fluctuation of the power system, only the lithium battery for charging is connected to the power system, and the load fluctuation of the power system is performed. When rapid discharge is required, a connection switching device that connects only the discharge lithium battery to the power system and
    前記大容量蓄電池、前記充電用リチウム電池、前記放電用リチウム電池の充放電制御を行う制御装置とを備え The large-capacity storage battery, the lithium battery for charging, and a control device for controlling charging / discharging of the lithium battery for discharging are provided .
    前記電力系統の負荷変動により急速放電が必要となったときは、前記接続切替装置は、前記放電用リチウム電池のみを電力系統に接続するとともに、前記充電用リチウム電池を前記大容量蓄電池に接続し、前記制御装置は、前記放電用リチウム電池から前記電力系統に電力を放電する放電制御を行い、前記大容量蓄電池から前記充電用リチウム電池に電力を充電する充電制御を行い、前記放電用リチウム電池が放電停止となると、前記接続切替装置は、前記充電用リチウム電池と前記放電用リチウム電池とを入れ替え、 When rapid discharge is required due to load fluctuations in the power system, the connection switching device connects only the lithium battery for discharging to the power system and connects the lithium battery for charging to the large-capacity storage battery. The control device performs discharge control for discharging power from the discharge lithium battery to the power system, and performs charge control for charging the charging lithium battery from the large-capacity storage battery, and the discharge lithium battery. When the discharge is stopped, the connection switching device replaces the charging lithium battery and the discharging lithium battery.
    一方、前記電力系統の負荷変動により急速充電が必要となったときは、前記接続切替装置は、前記充電用リチウム電池のみを電力系統に接続するとともに、前記放電用リチウム電池を前記大容量蓄電池に接続し、前記制御装置は、前記充電用リチウム電池に前記電力系統からの電力を充電する充電制御を行い、前記放電用リチウム電池から前記大容量蓄電池に電力を放電する放電制御を行い、前記充電用リチウム電池が充電停止となると、前記接続切替装置は、前記充電用リチウム電池と前記放電用リチウム電池とを入れ替えることを特徴とする蓄電池システム。 On the other hand, when quick charging is required due to load fluctuation of the power system, the connection switching device connects only the charging lithium battery to the power system and uses the discharging lithium battery as the large-capacity storage battery. When connected, the control device performs charge control for charging the charging lithium battery with power from the power system, discharge control for discharging power from the discharging lithium battery to the large-capacity storage battery, and the charging. The connection switching device is a storage battery system characterized in that the charging lithium battery and the discharging lithium battery are replaced when the charging lithium battery is stopped . A large-capacity storage battery that charges surplus power according to load fluctuations of the power system and discharges insufficient power; A large-capacity storage battery that charges surplus power according to load fluctuations of the power system and discharges insufficient power;
    A charging lithium battery for rapidly charging power from the power system maintained in a predetermined charging depth of charge less than 50% in a standby state ; A charging lithium battery for rapidly charging power from the power system maintained in a predetermined charging depth of charge less than 50% in a standby state ;
    A discharge lithium battery for rapidly discharging power to the power system maintained at a predetermined charge depth for discharge exceeding 50% in a standby state ; A discharge lithium battery for rapidly promoting power to the power system maintained at a predetermined charge depth for discharge exceeding 50% in a standby state ;
    Normally, only the large-capacity storage battery is connected to the power system, and when rapid charging is required due to load fluctuations of the power system, only the charging lithium battery is connected to the power system, and load fluctuations of the power system When rapid discharge is required by the connection switching device that connects only the lithium battery for discharge to the power system, Normally, only the large-capacity storage battery is connected to the power system, and when rapid charging is required due to load fluctuations of the power system, only the charging lithium battery is connected to the power system, and load fluctuations of the power system When rapid discharge is required by the connection switching device that connects only the lithium battery for discharge to the power system,
    A control device that performs charge / discharge control of the large-capacity storage battery, the charging lithium battery, and the discharging lithium battery ; A control device that performs charge / discharge control of the large-capacity storage battery, the charging lithium battery, and the similarly lithium battery ;
    When rapid discharge is required due to load fluctuations in the power system, the connection switching device connects only the discharge lithium battery to the power system and connects the charging lithium battery to the large-capacity storage battery. The control device performs discharge control for discharging power from the discharge lithium battery to the power system, performs charge control for charging power from the large-capacity storage battery to the charge lithium battery, and performs the discharge lithium battery. When the discharge is stopped, the connection switching device replaces the charging lithium battery and the discharging lithium battery, The control device performs discharge control for easily when rapid discharge is required due to load fluctuations in the power system, the connection switching device connects only the discharge lithium battery to the power system and connects the charging lithium battery to the large-capacity storage battery. power from the discharge lithium battery to the power system, performs charge control for charging power from the large-capacity storage battery to the charge lithium battery, and performs the discharge lithium battery. When the discharge is stopped, the connection switching device replaces the charging lithium battery and the electrically lithium battery,
    On the other hand, when rapid charging is required due to load fluctuations in the power system, the connection switching device connects only the charging lithium battery to the power system and the discharge lithium battery to the large-capacity storage battery. And the control device performs charge control for charging the charging lithium battery with power from the power system, performs discharge control for discharging power from the discharge lithium battery to the large-capacity storage battery, and performs the charging. When the lithium battery for charging is stopped, the connection switching device replaces the charging lithium battery and the discharging lithium battery . On the other hand, when rapid charging is required due to load fluctuations in the power system, the connection switching device connects only the charging lithium battery to the power system and the discharge lithium battery to the large-capacity storage battery. And the control device When the lithium battery for charging is stopped, the performing charge control for charging the charging lithium battery with power from the power system, performs discharge control for enabling power from the discharge lithium battery to the large-capacity storage battery, and performs the charging. connection switching device replaces the charging lithium battery and the similarly lithium battery .
  2. 前記充電用リチウム電池として複数の充電用リチウム電池を有し、複数の充電用リチウム電池は、待機状態で充電深度が50%未満の所定の充電用充電深度に代えて、段階的に異なる所定の充電用充電深度に維持され、
    前記電力系統の負荷変動により急速放電が必要となったときは、前記接続切替装置は、前記放電用リチウム電池のみを前記電力系統に接続するとともに、前記複数の充電用リチウム電池を前記大容量蓄電池に接続し、
    前記制御装置は、前記放電用リチウム電池から前記電力系統に電力を放電する放電制御を行い、前記複数の充電用リチウム電池にそれぞれ充電停止となるまで前記大容量蓄電池からの電力を充電する充電制御を行い、
    前記放電用リチウム電池が放電停止となると、前記接続切替装置は、前記放電用リチウム電池を前記充電用リチウム電池に切り替え、充電停止となった充電用リチウム電池を放電用リチウム電池に切り替えることを特徴とする請求項1記載の蓄電池システム。 When the discharge lithium battery is discharged, the connection switching device is characterized by switching the discharge lithium battery to the charging lithium battery and switching the charging lithium battery that has stopped charging to the discharging lithium battery. The storage battery system according to claim 1. The charging lithium battery includes a plurality of charging lithium batteries, and the plurality of charging lithium batteries replaces a predetermined charging depth for charging with a charging depth of less than 50% in a standby state . Maintained at the charging depth for charging, The charging lithium battery includes a plurality of charging lithium batteries, and the plurality of charging lithium batteries replaces a predetermined charging depth for charging with a charging depth of less than 50% in a standby state . Maintained at the charging depth for charging,
    When rapid discharge is required due to load fluctuations in the power system, the connection switching device connects only the discharge lithium battery to the power system, and connects the plurality of charging lithium batteries to the large-capacity storage battery. Connected to When rapid discharge is required due to load fluctuations in the power system, the connection switching device connects only the discharge lithium battery to the power system, and connects the plurality of charging lithium batteries to the large-capacity storage battery. Connected to
    The control device performs discharge control for discharging power from the discharge lithium battery to the power system, and charge control for charging power from the large-capacity storage battery until the charging of each of the plurality of charge lithium batteries is stopped. And The control device performs discharge control for similarly power from the discharge lithium battery to the power system, and charge control for charging power from the large-capacity storage battery until the charging of each of the plurality of charge lithium batteries is stopped.
    When the discharging lithium battery stops discharging, the connection switching device switches the discharging lithium battery to the charging lithium battery, and switches the charging lithium battery that has stopped charging to the discharging lithium battery. The storage battery system according to claim 1. When the appropriately lithium battery stops electrically, the connection switching device switches the similarly lithium battery to the charging lithium battery, and switches the charging lithium battery that has stopped charging to the similarly lithium battery. The storage battery system according to claim 1.
  3. 前記充電用リチウム電池として複数の充電用リチウム電池を有し、複数の充電用リチウム電池は、待機状態で充電深度が50%未満の所定の充電用充電深度に代えて、段階的に異なる所定の充電用充電深度に維持され、
    前記電力系統の負荷変動により急速充電が必要となったときは、前記接続切替装置は、前記複数の充電用リチウム電池のみを電力系統に接続するとともに、前記放電用リチウム電池を前記大容量蓄電池に接続し、 When quick charging is required due to load fluctuations in the power system, the connection switching device connects only the plurality of charging lithium batteries to the power system and connects the discharging lithium batteries to the large-capacity storage battery. connection,
    前記制御装置は、前記複数の充電用リチウム電池にそれぞれ充電停止となるまで前記電力系統からの電力を充電する充電制御を行い、前記放電用リチウム電池から前記大容量蓄電池に電力を放電する放電制御を行い、 The control device performs charge control for charging the power from the power system until each of the plurality of charging lithium batteries is stopped, and discharge control for discharging the power from the discharge lithium battery to the large-capacity storage battery. And
    前記充電用リチウム電池が充電停止となると、前記接続切替装置は、前記充電用リチウム電池を前記放電用リチウム電池に切り替え、放電停止となった放電用リチウム電池を充電用リチウム電池に切り替えることを特徴とする請求項1記載の蓄電池システム。 When the charging lithium battery is stopped charging, the connection switching device is characterized by switching the charging lithium battery to the discharging lithium battery and switching the discharging stopped lithium battery to the charging lithium battery. The storage battery system according to claim 1. The charging lithium battery includes a plurality of charging lithium batteries, and the plurality of charging lithium batteries replaces a predetermined charging depth for charging with a charging depth of less than 50% in a standby state . Maintained at the charging depth for charging, The charging lithium battery includes a plurality of charging lithium batteries, and the plurality of charging lithium batteries replaces a predetermined charging depth for charging with a charging depth of less than 50% in a standby state . Maintained at the charging depth for charging,
    When rapid charging is required due to load fluctuations in the power system, the connection switching device connects only the plurality of charging lithium batteries to the power system, and the discharge lithium battery is connected to the large-capacity storage battery. connection, When rapid charging is required due to load fluctuations in the power system, the connection switching device connects only the plurality of charging lithium batteries to the power system, and the discharge lithium battery is connected to the large-capacity storage battery. Connection,
    The control device performs charge control for charging the power from the power system until the charging of each of the plurality of charge lithium batteries is stopped, and discharge control for discharging power from the discharge lithium battery to the large-capacity storage battery And The control device performs charge control for charging the power from the power system until the charging of each of the plurality of charge lithium batteries is stopped, and discharge control for english power from the discharge lithium battery to the large-capacity storage battery And
    When the charging lithium battery stops charging, the connection switching device switches the charging lithium battery to the discharging lithium battery, and switches the discharging lithium battery that has stopped discharging to the charging lithium battery. The storage battery system according to claim 1. When the charging lithium battery stops charging, the connection switching device switches the charging lithium battery to the similarly lithium battery, and switches the similarly lithium battery that has stopped electrically to the charging lithium battery. The storage battery system according to claim 1.
  4. 前記大容量蓄電池は、NAS電池または中古リチウム電池であることを特徴とする請求項1乃至3のいずれか1項に記載の蓄電池システム。   The storage battery system according to any one of claims 1 to 3, wherein the large-capacity storage battery is a NAS battery or a used lithium battery.
  5. 通常時は、前記電力系統に前記大容量蓄電池のみを接続することに代えて、前記大容量蓄電池に加え、前記充電用リチウム電池あるいは前記放電用リチウム電池も接続されることを特徴とする請求項1乃至4のいずれか1項に記載の蓄電池システム。 The normal mode is characterized in that, instead of connecting only the large-capacity storage battery to the power system, the charging lithium battery or the discharging lithium battery is also connected in addition to the large-capacity storage battery. The storage battery system according to any one of 1 to 4.
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