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JP6552198B2 - Power generator - Google Patents
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JP6552198B2 - Power generator - Google Patents

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JP6552198B2
JP6552198B2 JP2015001505A JP2015001505A JP6552198B2 JP 6552198 B2 JP6552198 B2 JP 6552198B2 JP 2015001505 A JP2015001505 A JP 2015001505A JP 2015001505 A JP2015001505 A JP 2015001505A JP 6552198 B2 JP6552198 B2 JP 6552198B2
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JP2016127751A (en
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隆司 西山
隆司 西山
長 須藤
長 須藤
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西芝電機株式会社
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

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Description

本発明は、電力負荷に安定した電力を供給する発電装置に関する。   The present invention relates to a power generator that supplies stable power to a power load.

近年、石油依存度を低減し、地球の温暖化に影響のあるＣＯ２の排出量を削減するための一手段として、電力系統に風力や太陽光等の再生可能エネルギーを用いた発電設備を設置することが増加しつつある。 In recent years, as a means to reduce the degree of dependence on oil and reduce the amount of CO 2 emissions that affect global warming, install a power generation facility using renewable energy such as wind power and solar power in the power system Is increasing.

風力発電や太陽光発電等の再生可能エネルギーを利用した発電設備は、自然環境の条件によって左右されやすく、その設備から出力される電力は、常に変動している。そのため、再生可能エネルギー設備から出力される電力をそのまま電力系統に出力すると、離島等の電力系統が弱い電力系統では、その影響が及び、場合によっては、電力系統の電力に周波数変動等を生じさせることがある。   Power generation facilities using renewable energy such as wind power generation and solar power generation are easily affected by the conditions of the natural environment, and the power output from the facilities is constantly changing. Therefore, when the power output from the renewable energy facility is output as it is to the power grid, in the power grid where the power grid such as remote islands is weak, the influence is affected, and in some cases, the power grid power fluctuates in frequency. Sometimes.

このような問題を解決するものとして、電力供給システム（特許文献１参照）や発電装置（特許文献２参照）などが提案されている。特許文献１に記載された電力供給システム（以下、従来例１とする）及び特許文献２に記載された発電装置（以下、従来例２とする）では、直流電力系統を介して再生可能エネルギー設備を発電設備および蓄電設備と接続して、再生可能エネルギー設備から出力される電力変動を発電設備及び蓄電設備で吸収し、その直流電力系統の直流電力を電力変換器で一定の交流周波数の電力に変換して、電力系統、あるいは、電力負荷へ安定した電力を供給するように構成している。   In order to solve such a problem, a power supply system (see Patent Document 1), a power generation apparatus (see Patent Document 2), and the like have been proposed. In the power supply system described in Patent Document 1 (hereinafter referred to as Conventional Example 1) and the power generation apparatus described in Patent Document 2 (hereinafter referred to as Conventional Example 2), renewable energy equipment through a DC power system Power generation equipment and storage equipment to absorb fluctuations in power output from the renewable energy equipment with the power generation equipment and the storage equipment, and convert the DC power of the DC power system into power of a constant AC frequency with the power converter It is configured to convert and supply stable power to the power system or power load.

特開２０１２−１００５０４号公報JP 2012-100504 A 特開２０１３−１３５５１７号公報JP, 2013-135517, A

しかしながら、従来のものは、再生可能エネルギー設備ごとに直流電力系統を介して発電設備および蓄電池設備を設ける必要がある。しかも、再生可能エネルギー設備はいろいろな場所に設置され、また、その発電出力も産業用の大きなものから家庭用の小さなものまで、種々存在しているので、それぞれの再生可能エネルギー設備ごとに発電設備および蓄電池設備を設けることは、実際には不可能に近いものである。
しかも、電力系統が停電した場合には、電力負荷へは全く電力が供給されなくなり、安定した電力供給が望まれる電力負荷へは、別途、非常用発電装置等を設ける必要がある。 However, in the conventional apparatus, it is necessary to provide a power generation facility and a storage battery facility via a DC power system for each renewable energy facility. Moreover, since renewable energy facilities are installed in various places and there are various power generation output from large industrial ones to small household ones, power generation facilities for each renewable energy equipment And provision of storage battery equipment is practically impossible.
Moreover, when the power system fails, no power is supplied to the power load, and it is necessary to separately provide an emergency power generator or the like for the power load for which stable power supply is desired.

このように従来の電力供給システムは、再生可能エネルギー側と電力負荷側にそれぞれ発電設備を設けなければならず、設備投資が大きなものとなっている。   As described above, in the conventional power supply system, it is necessary to provide power generation equipment on the renewable energy side and the power load side, respectively, and the equipment investment is large.

上記課題を解決するために、本発明の実施形態に係る発電装置は、原動機によって駆動される発電機と、前記発電機の出力側に設けられ直流―交流電力を相互に電力変換する第２双方向電力変換器と、前記第２双方向電力変換器の出力側に設けられ、直流―交流電力を相互に電力変換する第１双方向電力変換器と、前記第２双方向電力変換器と前記第１双方向電力変換器との間の直流回路に接続される蓄電装置と、前記第１双方向電力変換器を制御する制御装置と、を備え、電力系統が停電でない場合は、前記第１双方向電力変換器の出力側を、電力負荷に近い電力系統に接続すると共に、前記制御装置が、前記電力系統の電力変動を検出し、その電力変動が急峻な時は前記蓄電装置の出力電圧によって電力変動分を打消すように、また、電力変動が緩やかな時は前記発電機の出力電圧によって電力変動分を打消すように前記第１双方向電力変換器を制御し、電力系統の停電を検知したときに、前記第１双方向電力変換器の出力側を電力負荷に接続し、前記発電機から前記第２双方向電力変換器および前記第１双方向電力変換器を介して前記電力負荷へ電力を供給すると共に、前記制御装置が、前記電力負荷の電力変動を検出し、その電力変動分を前記発電機および前記蓄電装置の出力電力で打消すように前記第１双方向電力変換器を制御し、前記電力負荷へ安定した電力を供給することを特徴とする。 In order to solve the above-mentioned subject, the power generator concerning the embodiment of the present invention is provided with the generator driven by the motor, and the 2nd both of which are provided in the output side of the above-mentioned generator, and mutually convert direct current-alternating current power. Power converter, a first bidirectional power converter provided on the output side of the second bidirectional power converter for mutually converting DC-AC power, and the second bidirectional power converter A storage device connected to a direct current circuit between the first bidirectional power converter and a control device for controlling the first bidirectional power converter, and the first system is not a power failure; The output side of the bidirectional power converter is connected to a power system close to the power load, and the control device detects power fluctuation of the power system, and when the power fluctuation is steep, the output voltage of the power storage device To cancel the power fluctuation by Fluctuation when gentle controls the first bidirectional power converter so as to cancel the power fluctuation by the output voltage of the generator, when detecting a power failure of the power system, the first bidirectional power converter Connecting the output side of the generator to a power load, supplying power from the generator to the power load via the second bidirectional power converter and the first bidirectional power converter, and the control device, The first bi-directional power converter is controlled to detect the power fluctuation of the power load and to cancel the power fluctuation by the output power of the generator and the storage device, and the stabilized power to the power load is detected. It is characterized by supplying.

更に、本発明の実施形態に係る発電装置は、前記発電機として電動発電機を用いると共に、前記原動機の起動時に前記第２双方向電力変換器を制御して、前記蓄電装置の電力で前記電動発電機を駆動させ前記原動機を始動することを特徴とする。 Furthermore, the power generation device according to the embodiment of the present invention, the conjunction used motor generator as a generator, and controls the pre-Symbol prime mover of the second bidirectional power converter at startup, the the power of said power storage device The motor generator is driven to start the motor.

また、本発明の実施形態に係る発電装置は、前記原動機によって駆動される前記発電機と、前記発電機の出力側に設けられ直流―交流電力を相互に電力変換する第２双方向電力変換器を１ユニットとして複数設け、前記各ユニットを前記第２双方向電力変換器の出力直流部で並列接続したことを特徴とする。 In the power generation apparatus according to the embodiment of the present invention, a second bidirectional power converter is provided on the output side of the generator driven by the prime mover and DC-AC power mutually converted. A plurality of units are provided as one unit, and the units are connected in parallel at the output DC section of the second bidirectional power converter.

また、本発明の実施形態に係る発電装置は、前記第１双方向電力変換器の出力側が前記電力負荷に接続されていない時に、前記原動機を駆動すると共に、前記第２双方向電力変換器を制御して、前記発電機の電力で前記蓄電装置を充電することを特徴とする。   In the power generation apparatus according to the embodiment of the present invention, the prime mover is driven when the output side of the first bidirectional power converter is not connected to the power load, and the second bidirectional power converter is used. The power storage device is charged by the power of the generator under control.

本発明の実施形態に係る発電装置は、電力系統に電力変動が生じても、電力負荷に安定した電力が給電でき、しかも、再生可能エネルギー設備ごとに発電装置や蓄電装置を設ける必要がなく、安定した電力が必要な電力負荷にのみ設置すればよいので、設備投資の削減が図れると共に、それに伴うメンテナンスの軽減ができ、また、既存の電力負荷にも後付で設置が可能である。   The power generation apparatus according to the embodiment of the present invention can supply stable power to the power load even when power fluctuations occur in the power system, and further, there is no need to provide a power generation apparatus or a power storage device for each renewable energy facility. Since installation is only required for power loads that require stable power, equipment investment can be reduced, and maintenance associated therewith can be reduced, and installation can be retrofitted to existing power loads.

また、何らかの原因で電力系統に停電が生じても、発電装置を電力負荷に対する非常用発電装置として機能させ、引き続き電力負荷に対して安定した電力を供給できる。しかも、電力負荷に電力変動が生じてもその変動を抑制できる。   Moreover, even if a power failure occurs in the power system for some reason, the power generation device can function as an emergency power generation device for the power load, and stable power can be continuously supplied to the power load. Moreover, even if power fluctuation occurs in the power load, the fluctuation can be suppressed.

更に、本発明の実施形態に係る発電装置は、電力系統に接続していない場合も、電力系統の停電を検知して原動機を始動させ、電力負荷に対して安定した電力を供給できる。
この場合、電力系統が停電し、原動機が起動完了するまでの期間、蓄電装置から電力負荷に対し電力が供給できるので、停電時間を非常に短くできる。 Furthermore, even when the power generation apparatus according to the embodiment of the present invention is not connected to the power system, the power failure of the power system can be detected to start the motor, and stable power can be supplied to the power load.
In this case, power can be supplied from the power storage device to the power load during the period from the power failure of the power system to the start-up of the prime mover, so that the power failure time can be very short.

本発明の発電装置を電力系統に接続する場合の構成図である。（実施例１）It is a block diagram in case the power generator of this invention is connected to an electric power grid | system. Example 1 本発明の発電装置を電力負荷に接続する場合の構成図である。（実施例２）It is a block diagram in the case of connecting the electric power generating apparatus of this invention to an electric power load. (Example 2) 複数のユニットから成る本発明の発電装置を電力系統に接続する場合の構成図である。（実施例５）It is a block diagram in the case of connecting the electric power generating apparatus of this invention which consists of a some unit to an electric power grid | system. (Example 5)

図１は、再生可能エネルギー設備である風力発電装置２２や太陽光発電装置２３が商用電源２０の電力系統２１に接続されており、電力負荷３０に近い電力系統２１に本発明の発電装置１が接続されている状態を示したものである。   In FIG. 1, a wind power generator 22 and a solar power generator 23, which are renewable energy equipment, are connected to the power grid 21 of the commercial power source 20, and the power generator 21 of the present invention is connected to the power grid 21 close to the power load 30. The connected state is shown.

図において、本発明の発電装置１は、原動機１０で駆動される発電機１１と、発電機１１から出力される交流電力を直流電力に変換する電力変換器１２と、この電力変換器１２の出力側と電力系統２１との間に設けられ、直流電力を交流電力に、また交流電力を直流電力に相互に電力変換する第１双方向電力変換器１３と、電力変換器１２の出力側である直流回路に接続され、その直流電力によって充放電を行う蓄電装置１４と、電力負荷３０に近い電力系統２１の電力変動を検出し、第１双方向電力変換器１３を制御する制御装置１５とから構成されている。   In the figure, a power generator 1 of the present invention includes a generator 11 driven by a prime mover 10, a power converter 12 that converts AC power output from the generator 11 into DC power, and an output of the power converter 12. A first bidirectional power converter 13 provided between the power supply system 21 and the power system 21 for converting DC power into AC power and AC power into DC power, and an output side of the power converter 12. From a storage device 14 connected to a DC circuit and performing charging and discharging by the DC power, and a control device 15 that detects the power fluctuation of the power system 21 close to the power load 30 and controls the first bidirectional power converter 13 It is configured.

制御装置１５は、電力系統２１の電力が変動して低下すると、蓄電装置１４から、その低下した分の電力を電力系統２１へ放電させ、逆に上昇するとその上昇した分の電力を蓄電装置１４で吸収（充電）するよう第１双方向電力変換器１３を制御する。
尚、蓄電装置１４による充放電は、主に電力系統２１の電力変動が急峻な時に行われ、緩やかな変動に対しては、発電機１１側で行われる。 When the power of power system 21 fluctuates and drops, control device 15 causes power storage device 14 to discharge the reduced amount of power to power system 21, and when it rises, power storage device 14 of the increased power. The first bidirectional power converter 13 is controlled so as to absorb (charge).
The charge and discharge by the power storage device 14 are mainly performed when the power fluctuation of the electric power system 21 is steep, and the moderate fluctuation is performed on the generator 11 side.

このように構成した本発明の発電装置１を電力負荷３０に近い電力系統２１に接続することにより、たとえ、再生可能エネルギー設備によって電力系統２１に電力変動が生じても、その変動分の電力が本発明の発電装置１によって吸収されるので、電力負荷３０には電力変動のない、安定した電力を供給することができる。   By connecting the power generation apparatus 1 of the present invention configured as described above to the power grid 21 close to the power load 30, even if power fluctuation occurs in the power grid 21 by the renewable energy facility, the power corresponding to the fluctuation is obtained. Since the electric power is absorbed by the power generation device 1 of the present invention, the electric power load 30 can be supplied with stable electric power without electric power fluctuation.

また、本発明の発電装置１は、安定した電力供給が必要な電力負荷の電力系統にのみ接続すればよく、従来のように再生可能エネルギー設備ごとに発電設備および蓄電装置を設ける必要がないことから、設備投資を抑制することができ、それに伴うメンテナンスも削減できる効果がある。   Moreover, the power generator 1 of the present invention need only be connected to the power system of the power load that requires stable power supply, and there is no need to provide a power generation facility and a power storage device for each renewable energy facility as in the prior art. Therefore, there is an effect that capital investment can be suppressed and maintenance accompanying it can be reduced.

更に、この状態で電力系統が停電になると、制御装置１５の検出先を図２のように第１双方向電力変換器１３の出力側に変更し、電力負荷３０には発電機１１から電力変換器１２と第１双方向電力変換器１３を介して電力が供給される。この状態で、電力負荷３０に電力変動が生じると、その変動を制御装置１５で検出し、その電力変動を蓄電装置１４および発電機１１の出力電力で打消すように第１双方向電力変換器１３を制御するので、電力負荷３０には引き続き電力変動のない、安定した電力を供給することができる。   Further, when the power system is interrupted in this state, the detection destination of the control device 15 is changed to the output side of the first bidirectional power converter 13 as shown in FIG. Electric power is supplied through the device 12 and the first bidirectional power converter 13. In this state, when power fluctuation occurs in the power load 30, the control device 15 detects the fluctuation, and the first bidirectional power converter is configured to cancel the power fluctuation with the output power of the power storage device 14 and the generator 11. 13 is controlled, the power load 30 can be continuously supplied with stable power without power fluctuation.

このように本発明の発電装置は、電力系統２１に接続し、電力系統２１の電力変動を吸収するだけでなく、電力系統２１に停電が発生しても、電力負荷３０に電力供給でき、しかも、電力変動を吸収して、電力負荷３０に安定した電力が供給できるので、別途、停電した場合に電力供給する非常用の発電装置を設ける必要がなく、電力供給システムとしての簡素化が図れる。   Thus, the power generation apparatus of the present invention can be connected to the power system 21 to absorb not only the power fluctuation of the power system 21 but also supply power to the power load 30 even if a power failure occurs in the power system 21 Since stable power can be supplied to the power load 30 by absorbing the power fluctuation, it is not necessary to separately provide an emergency power generator for supplying power in the event of a power failure, and the power supply system can be simplified.

尚、風力発電装置２２は風力発電機２４と、その発電機２４から出力される可変周波数の電力を一定周波数の電力に変換する交流―交流電力変換器２５とから構成され、太陽光発電装置２３は太陽光セル２６と、そのセル２６から出力される直流電力を一定周波数の交流電力に変換する直流―交流電力変換器２７とから構成されている。   The wind power generator 22 includes a wind power generator 24 and an AC-AC power converter 25 that converts variable frequency power output from the power generator 24 into constant frequency power. Is composed of a solar cell 26 and a DC-AC power converter 27 for converting DC power output from the cell 26 into AC power of a constant frequency.

また、１６、１７は開閉器で、電力負荷３０に電力系統２１から電力を供給する場合は開閉器１６を閉じており、本発明の発電装置１と共に電力負荷３０へ電力を供給する場合は開閉器１７も閉じた状態である。
更に、発電装置１からのみ電力負荷３０に電力を供給する場合は、開閉器１６は開き、開閉器１７は閉じた状態である。 Reference numerals 16 and 17 denote switches, and the switch 16 is closed when power is supplied to the power load 30 from the electric power system 21. The switch 16 is opened when power is supplied to the power load 30 together with the power generator 1 of the present invention. The vessel 17 is also closed.
Furthermore, when supplying electric power to the electric power load 30 only from the power generator 1, the switch 16 is open and the switch 17 is closed.

図２は、本発明の発電装置１を商用電源２０の電力系統２１に接続せずに待機させておき、電力系統２１が停電になった時に、その停電を検知して原動機１０を始動し、発電機１１から直接電力負荷３０へ電力を供給する非常用電源装置として機能する場合の説明図である。   In FIG. 2, the power generation apparatus 1 of the present invention is kept in standby without being connected to the power system 21 of the commercial power supply 20, and when the power system 21 loses power, the power failure is detected and the motor 10 is started. It is explanatory drawing in the case of functioning as an emergency power supply device that supplies power directly from the generator 11 to the power load 30.

図１と異なる点は、制御装置１５で検出する対象を電力系統２１ではなく、第１双方向電力変換器１３の出力側、即ち電力負荷３０の電力を検出する点と、図示していないが、電力系統２１の停電を検出し、原動機１０を始動する点と、電力系統２１の開閉器１６は開き、第１双方向電力変換器１３の出力側の開閉器１７を閉じる点が異なるのみで、他の構成は、図１に示した構成と同じである。   The difference from FIG. 1 is that the target to be detected by the control device 15 is not the power system 21 but the output side of the first bidirectional power converter 13, that is, the power of the power load 30 is not shown. The difference is that the power failure of the power system 21 is detected and the motor 10 is started and the switch 16 of the power system 21 is opened and the switch 17 on the output side of the first bidirectional power converter 13 is closed. The other configurations are the same as those shown in FIG.

このように構成した本発明の発電装置１は、商用電源２０の電力系統２１に停電が生じると原動機１０が起動し、発電機１１から電力変換器１２、第１双方向電力変換器１３、開閉器１７を介して電力負荷３０へ電力を供給する。また、この状態で電力負荷３０に電力変動が生じると、その変動を制御装置１５で検出し、その電力変動を蓄電装置１４および発電機１１の出力電力で打消すように第１双方向電力変換器１３を制御する。   In the power generation apparatus 1 of the present invention configured as described above, when a power failure occurs in the electric power system 21 of the commercial power supply 20, the motor 10 is activated, and from the generator 11 to the power converter 12, the first bidirectional power converter 13, switching Electric power is supplied to the electric power load 30 via the device 17. Further, when a power fluctuation occurs in the power load 30 in this state, the first bidirectional power conversion is performed so that the fluctuation is detected by the control device 15 and the power fluctuation is canceled by the output power of the power storage device 14 and the generator 11. Controller 13 is controlled.

このように本発明の発電装置１は、商用電源２０の電力系統２１に停電が生じた場合に、自動的に原動機１０を起動させ、発電機１１から電力負荷３０に電力供給する非常用電源装置として機能させることができる。しかも、電力負荷３０に急峻な電力変動が生じてもその変動を蓄電装置１４の充放電によって吸収できるので、電力負荷３０へは安定した電力を供給することができる。   As described above, the power generation apparatus 1 of the present invention automatically activates the prime mover 10 when the power grid 21 of the commercial power source 20 suffers a power failure, and supplies the power load 30 with power from the generator 11 as an emergency power supply apparatus. It can function as Moreover, even if a steep power fluctuation occurs in the power load 30, the fluctuation can be absorbed by charging / discharging of the power storage device 14, so that stable power can be supplied to the power load 30.

また、本発明の発電装置１は、電力変換器１２を、直流電力を交流電力に、また交流電力を直流電力に相互に電力変換できる第２双方向電力変換器１２ａに置き換えると共に、発電機１１を電動発電機１１ａに置き換えている。原動機１０を始動させる時には、第２双方向電力変換器１２ａを制御することにより蓄電装置１４の電力で電動発電機１１ａを駆動させることで、原動機１０を始動させる。   In addition, the power generation apparatus 1 of the present invention replaces the power converter 12 with a second bidirectional power converter 12 a that can mutually convert DC power into AC power and AC power into DC power, and Is replaced with the motor generator 11a. When the motor 10 is started, the motor 10a is started by driving the motor generator 11a with the electric power of the storage device 14 by controlling the second bidirectional power converter 12a.

このように構成することにより、原動機１０を始動させるために、従来必要であったセルモータやバッテリが必要なくなり、より一層構成を簡素化できる。   By comprising in this way, in order to start the motor | power_engine 10, the cell motor and battery which were conventionally required become unnecessary, and a structure can be simplified further.

また、本発明の発電装置１は、電力系統２１に停電が生じ原動機１０が起動完了するまでの間、制御装置１５によって第１双方向電力変換器１３を制御し、蓄電装置１４から電力負荷３０へ電力を供給する。
このように構成することにより、電力系統２１に停電が生じても、電力負荷３０へは非常に短時間で電力供給が再開でき、電力負荷の停止期間を短時間に抑えることができる。 Further, the power generation device 1 of the present invention controls the first bidirectional power converter 13 by the control device 15 until a power failure occurs in the power system 21 and the start of the prime mover 10 is completed. Power to
With such a configuration, even if a power failure occurs in the power system 21, power supply to the power load 30 can be resumed in a very short time, and the stop period of the power load can be suppressed in a short time.

図３は、本発明の発電装置１を、原動機１０によって駆動される発電機１１と、その出力を直流電力に変換する電力変換器１２とを１ユニットとして構成し、その複数のユニットを電力変換器１２の出力側の直流回路に並列状態で接続したものである。   FIG. 3 shows that the generator 1 of the present invention comprises a generator 11 driven by a prime mover 10 and a power converter 12 that converts its output into DC power as one unit, and converts the plurality of units into power conversion. Connected to the DC circuit on the output side of the device 12 in parallel.

このように構成することにより、発電機１１間を同期投入するような特別な装置も削減でき、また、何らかの原因でいずれかのユニットに不具合が生じても、電力負荷３０へは引き続き健全なユニットで電力が供給でき、発電装置としての冗長性を高めることができる。   By configuring in this way, it is also possible to reduce special devices that synchronously turn on the generators 11. Also, even if a failure occurs in any of the units for some reason, a unit that continues to be healthy for the power load 30 Thus, power can be supplied, and redundancy as a power generation device can be increased.

また、本発明の発電装置１は、原動機１０が停止している時に、開閉器１６、１７を介して電力系統２１と第１双方向電力変換器１３を接続すると共に、第１双方向電力変換器１３を制御して、電力系統２１の電力で蓄電装置１４を充電することにより、別途充電装置の設置を省略することができる。   Further, the power generation apparatus 1 of the present invention connects the power system 21 and the first bidirectional power converter 13 via the switches 16 and 17 when the motor 10 is stopped, and also performs the first bidirectional power conversion. By controlling the unit 13 to charge the power storage device 14 with the power of the power system 21, the installation of the charging device can be omitted separately.

また、本発明の発電装置１は、第１双方向電力変換器１３の出力側が開閉器１７で開かれ、何も接続されていない時に、原動機１０を駆動すると共に、第２双方向電力変換器１２ａを制御して、発電機１１の電力で蓄電装置１４を充電するようにしても実施例６と同じく別途充電装置の設置を省略することができる。   Further, the power generating apparatus 1 of the present invention drives the motor 10 when the output side of the first bidirectional power converter 13 is opened by the switch 17 and nothing is connected, and the second bidirectional power converter Even if the power storage device 14 is charged with the electric power of the generator 11 by controlling 12a, the installation of the charging device can be omitted separately as in the sixth embodiment.

以上述べたように、本発明の発電装置は、電力負荷に電力を供給する電力系統に連系することにより、再生可能エネルギー設備の電力変動によって電力系統に電力変動が生じても、その電力変動を吸収し、電力負荷に安定した電力を供給できるので、従来のように再生可能エネルギー設備ごとに発電設備および蓄電装置を設ける必要がなく、しかも、電力系統が停電になっても、引き続き電力負荷に安定した電力を供給できるので、別途、非常用発電装置等を設ける必要がなく、設備投資を抑制でき、また、商用電源と連系しない場合は、商用電源が停電した場合に自動的に原動機が始動して電力負荷へ電力を供給する非常用発電装置として機能し、しかも、電力負荷に電力変動が生じてもその変動を抑制し、安定した電力を供給できるものである。   As described above, the power generation apparatus of the present invention is connected to the power system that supplies power to the power load, so that even if power fluctuations occur in the power system due to power fluctuations in renewable energy facilities, the power fluctuations It is not necessary to provide a power generation facility and a storage device for each renewable energy facility as in the past, and even if the power system fails, the power load continues to be used. Because it is possible to supply stable power, there is no need to separately provide an emergency power generator, etc., and equipment investment can be suppressed, and if it is not linked with a commercial power supply, the prime mover automatically when the commercial power fails. Functions as an emergency power generator that starts and supplies power to the power load, and even if power fluctuation occurs in the power load, the fluctuation can be suppressed and stable power can be supplied A.

また、商用電源が停電し、原動機が起動完了するまでの期間、蓄電装置から電力負荷に電力が供給できるので、電力負荷の停電期間を非常に短くでき、電力負荷に対して無停電で安定した電力を供給できるものである。
更には、原動機を始動させるバッテリやセルモータ、及び蓄電装置を充電するための充電装置を別途設ける必要がなく、機器構成の簡素化が図れるものである。 In addition, since power can be supplied from the storage device to the power load during the period until the commercial power source fails and startup of the prime mover is complete, the power load's power outage period can be extremely shortened, and the power load is stabilized without interruption. It can supply power.
Furthermore, it is not necessary to separately provide a battery for starting the prime mover, a cell motor, and a charging device for charging the power storage device, and the device configuration can be simplified.

１…発電装置、１０…原動機、１１…発電機、１１ａ…電動発電機、１２…電力変換器、１２ａ…第２双方向電力変換器、１３…第１双方向電力変換器、１４…蓄電装置、１５…制御装置、１６、１７…開閉器、２０…商用電源、２１…電力系統、２２…風力発電装置、２３…太陽光発電装置、２４…風力発電機、２５…交流―交流電力変換器、２６…太陽光セル、２７…直流―交流電力変換器、３０…電力負荷   DESCRIPTION OF SYMBOLS 1 ... Power generator, 10 ... Motor, 11 ... Generator, 11a ... Motor generator, 12 ... Power converter, 12a ... 2nd bidirectional power converter, 13 ... 1st bidirectional power converter, 14 ... Storage device , 15: controller, 16, 17: switch, 20: commercial power source, 21: electric power system, 22: wind power generator, 23: solar power generator, 24: wind power generator, 25: AC-AC power converter , 26 ... solar cell, 27 ... DC-AC power converter, 30 ... power load

Claims (4)

原動機によって駆動される発電機と、
前記発電機の出力側に設けられ直流―交流電力を相互に電力変換する第２双方向電力変換器と、
前記第２双方向電力変換器の出力側に設けられ、直流―交流電力を相互に電力変換する第１双方向電力変換器と、
前記第２双方向電力変換器と前記第１双方向電力変換器との間の直流回路に接続される蓄電装置と、
前記第１双方向電力変換器を制御する制御装置と、を備え、
電力系統が停電でない場合は、前記第１双方向電力変換器の出力側を、電力負荷に近い電力系統に接続すると共に、前記制御装置が、前記電力系統の電力変動を検出し、その電力変動が急峻な時は前記蓄電装置の出力電圧によって電力変動分を打消すように、また、電力変動が緩やかな時は前記発電機の出力電圧によって電力変動分を打消すように前記第１双方向電力変換器を制御し、
電力系統の停電を検知したときに、前記第１双方向電力変換器の出力側を電力負荷に接続し、前記発電機から前記第２双方向電力変換器および前記第１双方向電力変換器を介して前記電力負荷へ電力を供給すると共に、前記制御装置が、前記電力負荷の電力変動を検出し、その電力変動分を前記発電機および前記蓄電装置の出力電力で打消すように前記第１双方向電力変換器を制御し、前記電力負荷へ安定した電力を供給することを特徴とする発電装置。 A generator driven by a motor,
A second bidirectional power converter provided on the output side of the generator for mutually converting DC-AC power;
A first bidirectional power converter provided on the output side of the second bidirectional power converter, for converting DC-AC power to each other;
A power storage device connected to a DC circuit between the second bidirectional power converter and the first bidirectional power converter;
A controller for controlling the first bidirectional power converter;
When the power system is not a power failure, the output side of the first bidirectional power converter is connected to the power system close to the power load, and the control device detects the power fluctuation of the power system, and the power fluctuation When the power is steep, the power fluctuation is canceled by the output voltage of the storage device, and when the power fluctuation is slow, the power fluctuation is canceled by the output voltage of the generator. Control the power converter,
When detecting a power failure of the power system, the output side of the first bidirectional power converter connected to the power load, the second bidirectional power converter and the first bidirectional power converter from the generator Power is supplied to the power load, and the control device detects power fluctuation of the power load and the first power fluctuation is extinguished by the output power of the generator and the storage device. A power generator that controls a bidirectional power converter and supplies stable power to the power load. 前記発電機として電動発電機を用いると共に、
前記原動機の起動時に前記第２双方向電力変換器を制御して、前記蓄電装置の電力で前記電動発電機を駆動させ前記原動機を始動することを特徴とする請求項１に記載の発電装置。 As well as using a motor generator as the generator,
The power generating apparatus according to claim 1, wherein the second bidirectional power converter is controlled at the time of starting of the motor, and the motor generator is driven by electric power of the power storage device to start the motor. 前記原動機によって駆動される前記発電機と、前記発電機の出力側に設けられ直流―交流電力を相互に電力変換する第２双方向電力変換器を１ユニットとして複数設け、前記各ユニットを前記第２双方向電力変換器の出力直流部で並列接続したことを特徴とする請求項１又は２に記載の発電装置。 A plurality of the generator driven by the prime mover and a plurality of second bidirectional power converters provided on the output side of the generator for mutually converting DC-AC power are provided as one unit, and The power generator according to claim 1 or 2 , wherein the output DC units of the two bidirectional power converters are connected in parallel. 前記第１双方向電力変換器の出力側が前記電力負荷に接続されていない時に、前記原動機を駆動すると共に、前記第２双方向電力変換器を制御して、前記発電機の電力で前記蓄電装置を充電することを特徴とする請求項１乃至３のいずれかに記載の発電装置。 When the output side of the first bidirectional power converter is not connected to the power load, the motor is driven and the second bidirectional power converter is controlled to control the power storage device with the power of the generator. The power generation device according to any one of claims 1 to 3 , characterized in that
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