JP2008148442A - Charging/discharging control system of power storage section in natural energy utilizing power generation system - Google Patents

Charging/discharging control system of power storage section in natural energy utilizing power generation system Download PDF

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JP2008148442A
JP2008148442A JP2006332638A JP2006332638A JP2008148442A JP 2008148442 A JP2008148442 A JP 2008148442A JP 2006332638 A JP2006332638 A JP 2006332638A JP 2006332638 A JP2006332638 A JP 2006332638A JP 2008148442 A JP2008148442 A JP 2008148442A
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power generation
storage unit
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Seiro Mori
晴郎 森
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Daiwa House Industry Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charging/discharging control system of a power storage section in a natural energy utilizing power generation system capable of reducing the capacity of a power storage section and eliminating the uselessness of power generation by natural energy. <P>SOLUTION: The charging/discharging control system is provided with a storage section 11 for reading and storing a load demand status and a power generation status; and processing control section 10 for executing processing on the basis of past data of the load demand status and power generation status stored in the storage section 11, weather prediction information from an Internet 12 and the charging status in the power storage section 5, and causing switches a, b to switch a charging execution mode, a discharging execution mode and a charging/discharging suspension mode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、太陽光発電等の自然エネルギー利用発電システムにおける蓄電部の充放電制御システムに関する。   The present invention relates to a charge / discharge control system for a power storage unit in a power generation system using natural energy such as solar power generation.

太陽光発電システムや風力発電システム等の自然エネルギーを利用した発電システムとして、負荷側で利用されない余剰電力を蓄電部に充電し、自然エネルギーからの出力が無いか又は少ない時に蓄電部から電力を供給するようにした、系統と連系ざたシステムは提供されている。このシステムでは、自然エネルギーからの日々の発電量と日々の負荷需要量との関係より、蓄電池の容量を算出し、それに基づいて蓄電池の容量が決定される。
特開平９−１４０１５６号公報 As a power generation system using natural energy such as a solar power generation system or wind power generation system, the power storage unit is charged with surplus power that is not used on the load side, and power is supplied from the power storage unit when there is little or no output from natural energy A system linked to the grid is provided. In this system, the capacity of the storage battery is calculated from the relationship between the daily power generation amount from natural energy and the daily load demand, and the capacity of the storage battery is determined based on the calculated capacity.
Japanese Patent Laid-Open No. 9-14156

しかしながら、自然エネルギー利用の発電システムでは、年間を通じて安定した電力の供給が困難であるため、見かけ上、独立電源として利用するような場合は、容量の非常に大きな蓄電部を必要とし、初期コストが高くついてしまうという問題がある。   However, since it is difficult to supply stable power throughout the year in a power generation system using natural energy, apparently, when it is used as an independent power source, it requires an extremely large capacity power storage unit, and the initial cost is low. There is a problem of being expensive.

仮に、蓄電部の蓄電容量を制限してしまうと、自然エネルギーによる発電電力量と、蓄電部の容量と、負荷容量とのバランスが一定に保たれないため、自然エネルギーによる発電電力を有効に利用できず、無駄にしてしまいやすいという問題を生じる。   If the power storage capacity of the power storage unit is limited, the balance between the amount of power generated by natural energy, the capacity of the power storage unit, and the load capacity cannot be kept constant, so the power generated by natural energy can be used effectively. There is a problem that it cannot be done and is easily wasted.

特に、自然エネルギーによる発電電力量が、充電可能残量と負荷需要量との和よりも大きい場合、太陽光発電であれば、本来発電されるべき電力が発生せず、風力発電であれば、風車を停止させる信号を出力し、本来回転して発電されるべき電力を無駄にしてしまう。   In particular, if the amount of power generated by natural energy is larger than the sum of the remaining chargeable amount and the load demand, if it is solar power generation, the power that should be generated is not generated, and if it is wind power generation, A signal for stopping the windmill is output, and the electric power that should be rotated and generated is wasted.

本発明は、上記のような問題点に鑑み、蓄電部の容量を小さくすることができ、それでいて、自然エネルギーによる発電電力の無駄をなくすことができる自然エネルギー利用発電システムにおける蓄電部の充放電制御システムを提供することを課題とする。   In view of the above problems, the present invention can reduce the capacity of a power storage unit, and yet can eliminate the waste of power generated by natural energy, and can control the charge / discharge of the power storage unit in a power generation system using natural energy. The problem is to provide a system.

上記の課題は、自然エネルギー利用の発電部と、発電部で発電した直流電力を交流電力に変換して負荷側に出力するインバーターと、発電部で発電した電力を蓄電する蓄電部とが備えられ、蓄電部に蓄電された電力が交流電力に変換されて負荷側に出力されるようになされた自然エネルギー利用発電システムにおける蓄電部の充放電制御システムであって、
前記蓄電部の充放電に関するモードの切換えを行う切換え手段が備えられると共に、
負荷需要状況及び発電状況を読み取って記憶していく記憶部と、記憶部に記憶された過去の負荷需要状況及び発電状況のデータと、インターネット網からの気象予報情報と、蓄電部における充電状態とに基づいて処理を行い、前記モードの切換えを前記切換え手段に行わせていく処理制御部が備えられていることを特徴とする、自然エネルギー利用発電システムにおける蓄電部の充放電制御システムによって解決される。 The above-mentioned problems are provided with a power generation unit using natural energy, an inverter that converts DC power generated by the power generation unit into AC power and outputs it to the load side, and a power storage unit that stores the power generated by the power generation unit. A charge / discharge control system for a power storage unit in a natural energy-based power generation system in which power stored in the power storage unit is converted into AC power and output to a load side,
A switching means for switching modes related to charging and discharging of the power storage unit is provided,
A storage unit that reads and stores the load demand status and the power generation status, past load demand status and power generation status data stored in the storage unit, weather forecast information from the Internet network, and a charge status in the power storage unit And a charging / discharging control system for a power storage unit in a natural energy power generation system, characterized in that a processing control unit is provided for performing processing based on The

この制御システムでは、気象予報情報と過去の発電状況と蓄電部の充電状況とに基づいて、蓄電部での充放電制御が行われるようになされているので、蓄電部の満充電状態による発電電力の無駄の発生をうまい具合に少なくする、ないしは、なくすことができ、しかも、それを容量の小さい蓄電部で実現することができる。   In this control system, charge / discharge control in the power storage unit is performed based on the weather forecast information, the past power generation status, and the charge status of the power storage unit. The generation of waste can be reduced or eliminated in a good manner, and this can be realized with a power storage unit having a small capacity.

また、気象予報情報だけでなく、過去の負荷需要状況に基づいて蓄電部での充放電制御を行うようになされているので、より精度の高い充放電制御が可能になって、発電電力の無駄をより効果的に少なくする、ないしは、なくすことができる。   In addition, the charging / discharging control in the power storage unit is performed based not only on the weather forecast information but also on the past load demand situation. Can be reduced or eliminated more effectively.

本発明は、以上のとおりのものであるから、蓄電部の容量を小さくすることができ、それでいて、自然エネルギーによる発電電力の無駄をなくすことができる。   Since the present invention is as described above, the capacity of the power storage unit can be reduced, and the waste of power generated by natural energy can be eliminated.

次に、本発明の実施最良形態を図面に基づいて説明する。   Next, the best mode for carrying out the present invention will be described with reference to the drawings.

図１に示す実施形態の自然エネルギー利用発電システムは、太陽光を利用した発電システムで、１は太陽光発電部、２はパワーコンディショナー、３は商用電源、４は負荷、５は蓄電部である。   1 is a power generation system using sunlight, 1 is a solar power generation unit, 2 is a power conditioner, 3 is a commercial power supply, 4 is a load, and 5 is a power storage unit. .

パワーコンディショナー２は、インバーター機能を備え、発電部１で発電された電力は、整流器７と、ＤＣ／ＤＣコンバーター８、システムコントローラー９を経て、パワーコンディショナー２にて直流から交流に変換され、負荷４側に出力されるようになされている。   The power conditioner 2 has an inverter function, and the electric power generated by the power generation unit 1 is converted from direct current to alternating current by the power conditioner 2 through the rectifier 7, the DC / DC converter 8, and the system controller 9. Output to the side.

蓄電部５は、発電部１で発電した直流電力が交流直流の変換過程を経ることなく蓄電されるようになされていると共に、蓄電した直流電力は放電によりパワーコンディショナー２で交流電力に変換されて負荷４側に出力されるようになされている。   The power storage unit 5 is configured such that the DC power generated by the power generation unit 1 is stored without going through an AC / DC conversion process, and the stored DC power is converted into AC power by the power conditioner 2 by discharge. The output is made to the load 4 side.

蓄電部５の上記のような充電、放電の切換えを行う切換え手段として、スイッチａ，ｂが備えられ、スイッチａがオン、スイッチｂがオフの「充電実行専用モード」と、スイッチａがオフ、スイッチｂがオンの「充放電中止モード」と、スイッチａがオン、スイッチｂがオンの「昼間余剰電力充電／夜間放電モード」とに切換えを行うことができるようになされている。   As switching means for switching between charging and discharging of the power storage unit 5 as described above, the switches a and b are provided, the “charging execution exclusive mode” in which the switch a is on and the switch b is off, and the switch a is off. Switching between the “charge / discharge stop mode” in which the switch b is on and the “daytime surplus power charging / night discharge mode” in which the switch a is on and the switch b is on can be performed.

そして、スイッチａ，ｂのオンオフの状態を切換え制御する処理制御部１０が備えられると共に、負荷需要状況及び発電状況を時間単位で読み取って記憶していく記憶部１１とが備えられ、処理制御部１０は、記憶部１１に記憶された例えば過去１年分の負荷需要状況及び発電状況のデータと、インターネット網１２からの気象予報情報と、蓄電部５における充電状態（ＳＯＣ）とに基づいて処理を行い、その処理結果に基づいて、蓄電部５が最適な充放電運転を行うように、スイッチａ，ｂに上記モードの切換えを行わせる制御を行うようになされている。   A processing control unit 10 that switches and controls the on / off states of the switches a and b is provided, and a storage unit 11 that reads and stores the load demand status and the power generation status in units of time is provided. 10 is processed based on, for example, data on load demand status and power generation status for the past year stored in the storage unit 11, weather forecast information from the Internet network 12, and the state of charge (SOC) in the power storage unit 5. Based on the processing result, control is performed to cause the switches a and b to switch the mode so that the power storage unit 5 performs the optimum charge / discharge operation.

処理制御部１０は、記憶部１１に記憶された過去の発電状況と過去の負荷需要状況から、季節ごと、曜日ごと、時間帯ごとの発電状況と負荷需要状況を算出処理することができるようになされているとよい。   The processing control unit 10 can calculate and process the power generation status and the load demand status for each season, each day of the week, and each time zone from the past power generation status and the past load demand status stored in the storage unit 11. It should be done.

上記の充放電制御システムでは、インターネット網１２からの気象予報情報と記憶部１１からの過去の発電状況と蓄電部５の充電状況とに基づいて、処理制御部１０によって蓄電部５での充放電制御が行われるようになされているので、蓄電部５の満充電状態による発電電力の無駄の発生をうまい具合に少なくする、ないしは、なくすことができ、しかも、それを容量の小さい蓄電部で実現することができ、また、気象予報情報だけでなく、過去の負荷需要状況に基づいて蓄電部５での充放電制御が行われるようになされているので、より精度の高い充放電制御が可能になって、発電電力の無駄をより効果的に少なくする、ないしは、なくすことができる。   In the charge / discharge control system described above, charging / discharging in the power storage unit 5 is performed by the processing control unit 10 based on weather forecast information from the Internet 12, past power generation status from the storage unit 11, and charging status of the power storage unit 5. Since the control is performed, it is possible to reduce or eliminate the waste of generated power due to the fully charged state of the power storage unit 5, and achieve it with a power storage unit with a small capacity. In addition, the charge / discharge control in the power storage unit 5 is performed based not only on the weather forecast information but also on the past load demand situation, so that more accurate charge / discharge control is possible. Thus, the waste of generated power can be reduced or eliminated more effectively.

また、蓄電部５の充電状態を処理制御部１０で監視して、設定範囲内で充放電を繰り返すことができて、過放電・過充電による不具合の発生を上記のような処理制御によって低減することも可能になる。   Further, the state of charge of the power storage unit 5 can be monitored by the processing control unit 10 and charging / discharging can be repeated within the set range, and the occurrence of problems due to overdischarge / overcharge can be reduced by the above processing control. It becomes possible.

以上に、本発明の実施形態を示したが、本発明はこれに限られるものではなく、発明思想を逸脱しない範囲で各種の変更が可能である。例えば、上記の実施形態では、自然エネルギーを利用した発電部として、太陽光発電部を用いた場合を示したが、風力発電部であってもよいし、水力発電部であってもよいし、各種自然エネルギーを利用した発電部であればよい。   Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, a case where a solar power generation unit is used as a power generation unit using natural energy has been shown, but it may be a wind power generation unit or a hydropower generation unit, What is necessary is just the electric power generation part using various natural energy.

また、上記の実施形態では系統と連系させた発電システムに適用した場合を示したが、系統と連系させない独立電源としての自然エネルギー利用発電システムに適用することも可能である。   Moreover, although the case where it applied to the power generation system connected with the grid | system was shown in said embodiment, it is also possible to apply to the natural energy utilization power generation system as an independent power supply which is not linked with a grid | system.

更に、上記の実施形態では、充電、放電の切換えを行う切換え手段として、スイッチａ，ｂが備えられ、切換えのモードとして、「充電実行専用モード」、「充放電中止モード」及び「昼間余剰電力充電夜間放電モード」を用いた場合を示したが、切換え手段を構成するスイッチの数や配置に制限はないし、スイッチ以外のもので切換え手段が構成されていてもよいし、また、各種のモードが用いられてよく、要は、蓄電部の充放電に関するなんらかのモードの切換えを行うなんらかの切換え手段が備えられていればよい。   Further, in the above-described embodiment, the switches a and b are provided as switching means for switching between charging and discharging, and the switching modes include “charge execution only mode”, “charge / discharge stop mode” and “daytime surplus power”. Although the case of using the “charge night discharge mode” is shown, there is no limit to the number and arrangement of switches constituting the switching means, and the switching means may be constituted by other than the switches, and various modes In short, it suffices if some switching means for switching some mode related to charging and discharging of the power storage unit is provided.

実施形態の充放電制御システムを示す説明図である。It is explanatory drawing which shows the charging / discharging control system of embodiment.

符号の説明Explanation of symbols

１…発電部
２…パワーコンディショナー（インバーター）
４…負荷
５…蓄電部
１０…処理制御部
１１…記憶部
１２…インターネット網 1 ... Power generation unit 2 ... Power conditioner (inverter)
4 ... Load 5 ... Power storage unit 10 ... Processing control unit 11 ... Storage unit 12 ... Internet network

Claims (1)

自然エネルギー利用の発電部と、発電部で発電した直流電力を交流電力に変換して負荷側に出力するインバーターと、発電部で発電した電力を蓄電する蓄電部とが備えられ、蓄電部に蓄電された電力が交流電力に変換されて負荷側に出力されるようになされた自然エネルギー利用発電システムにおける蓄電部の充放電制御システムであって、
前記蓄電部の充放電に関するモードの切換えを行う切換え手段が備えられると共に、
負荷需要状況及び発電状況を読み取って記憶していく記憶部と、記憶部に記憶された過去の負荷需要状況及び発電状況のデータと、インターネット網からの気象予報情報と、蓄電部における充電状態とに基づいて処理を行い、前記モードの切換えを前記切換え手段に行わせていく処理制御部が備えられていることを特徴とする、自然エネルギー利用発電システムにおける蓄電部の充放電制御システム。 A power generation unit using natural energy, an inverter that converts DC power generated by the power generation unit into AC power and outputs it to the load side, and a power storage unit that stores the power generated by the power generation unit are provided. A charge / discharge control system for a power storage unit in a power generation system using natural energy, wherein the generated power is converted into AC power and output to the load side,
A switching means for switching modes related to charging and discharging of the power storage unit is provided,
A storage unit that reads and stores the load demand status and the power generation status, past load demand status and power generation status data stored in the storage unit, weather forecast information from the Internet network, and a charge status in the power storage unit A charging / discharging control system for a power storage unit in a natural energy-based power generation system, comprising: a processing control unit that performs processing based on the above and causes the switching unit to switch the mode.
JP2006332638A 2006-12-08 2006-12-08 Charging/discharging control system of power storage section in natural energy utilizing power generation system Pending JP2008148442A (en)

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