JP2020198736A - DC cooperation system - Google Patents

DC cooperation system Download PDF

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JP2020198736A
JP2020198736A JP2019104709A JP2019104709A JP2020198736A JP 2020198736 A JP2020198736 A JP 2020198736A JP 2019104709 A JP2019104709 A JP 2019104709A JP 2019104709 A JP2019104709 A JP 2019104709A JP 2020198736 A JP2020198736 A JP 2020198736A
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power
load
circuit
protection circuit
bus
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JP7274944B2 (en
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彰訓 加藤
Akikuni Kato
彰訓 加藤
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Kawamura Electric Inc
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Kawamura Electric Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Emergency Protection Circuit Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

To provide a DC cooperation system for efficiently supplying power generated by a private power generator to a load without implementing complicated power control.SOLUTION: A solar power generation device 21, a wind power generation device 22, a storage battery 25, and commercial power 26 are used as power sources. The electric power is converted into a direct current of a predetermined voltage and integrated on a direct current bus 6. The integrated direct current power is supplied to a plurality of loads 2. In a load electric circuit 6a branched from the direct current bus 6, a load priority setting circuit 8 for setting a priority for each load 2 is provided. When the power supplied decreases, the power supply is stopped from the load set with a lower priority.SELECTED DRAWING: Figure 1

Description

本発明は、自家発電電力と商用電源を連携させて効率良く直流負荷に電力を供給する直流連携システムに関する。 The present invention relates to a DC cooperation system that efficiently supplies power to a DC load by linking privately generated power and a commercial power source.

従来より、太陽光発電等の自家発電装置により発電した電力、及び蓄電池に蓄えられた電力を使用して直流負荷を稼働させる直流連携システムがある。
例えば、特許文献１では、直流幹線に電力を供給するために、商用電力を直流変換する整流調整装置、太陽光発電の出力を昇圧するＤＣ／ＤＣコンバータ、蓄電池の電圧を昇圧するＤＣ／ＤＣコンバータをそれぞれ設けると共に、個々の出力電力を検出して制御する電力調整装置を別途設けて、特定の電源設備が過負荷にならないよう制御した。 Conventionally, there is a DC cooperation system that operates a DC load by using electric power generated by a private power generation device such as photovoltaic power generation and electric power stored in a storage battery.
For example, in Patent Document 1, a rectifier / regulator that converts commercial power into DC, a DC / DC converter that boosts the output of solar power generation, and a DC / DC converter that boosts the voltage of a storage battery in order to supply power to a DC trunk line. In addition to each, a power regulator that detects and controls each output power is separately provided to control the specific power supply equipment so that it does not become overloaded.

特開２００４−２０８４２６号公報Japanese Unexamined Patent Publication No. 2004-208426

上述した従来の直流連携システムでは、太陽光発電や蓄電池に電流センサを設けて電力を監視し、電力監視装置により発電電力量や充放電電力を管理したため、自家発電装置による発電電力と商用電力を連携して直流負荷に電力を供給するには複雑な電力制御を実施していた。 In the conventional DC cooperation system described above, a current sensor is provided in the solar power generation or storage battery to monitor the power, and the power generation amount and charge / discharge power are managed by the power monitoring device. In order to supply power to the DC load in cooperation, complicated power control was carried out.

そこで、本発明はこのような問題点に鑑み、複雑な電力制御を実施することなく自家発電装置による発電電力を負荷に供給する直流連携システムを提供することを目的としている。 Therefore, in view of such a problem, an object of the present invention is to provide a DC cooperation system that supplies power generated by a private power generation device to a load without performing complicated power control.

上記課題を解決する為に、請求項１の発明は、自家発電電力、蓄電池、及び商用電力の３種類のうち、少なくとも２種類の電力を電源として、所定電圧の直流に変換して直流母線に重畳させて統合し、統合した直流電力を複数の負荷に供給する直流連携システムであって、直流母線を分岐して負荷に電力を供給する負荷電路には、負荷毎に優先順位を設定する負荷優先順位設定回路が設けられており、供給される電力が低下すると、優先順位が低く設定された負荷から電力の供給が停止されることを特徴とする。
この構成によれば、供給される電力が低下すると、優先順位が低く設定された負荷から順に停止するため、一斉に負荷が停止する事態を防止できる。一方、極力停止を回避したい負荷は優先順位を高く設定することで、安全確保がし易い。
そして、自家発電電力や蓄電池に電流センサを設けて電力を監視しないため、電力を監視して制御する複雑な制御をすること無く複数の電源を連携させて直流負荷に電力を供給できる。 In order to solve the above problem, the invention of claim 1 uses at least two types of electric power out of three types of privately generated electric power, storage battery, and commercial electric power as a power source and converts them into direct current of a predetermined voltage to form a direct current bus. A DC linkage system that superimposes and integrates and supplies integrated DC power to multiple loads. Loads that branch the DC bus to supply power to the load and set priorities for each load. A priority setting circuit is provided, and when the supplied power decreases, the power supply is stopped from the load set with a low priority.
According to this configuration, when the supplied power decreases, the loads are stopped in order from the load set with the lowest priority, so that it is possible to prevent the load from being stopped all at once. On the other hand, it is easy to ensure safety by setting a high priority for loads that want to avoid stopping as much as possible.
Further, since the privately generated power or the storage battery is provided with a current sensor to not monitor the power, it is possible to supply power to the DC load by linking a plurality of power sources without performing complicated control for monitoring and controlling the power.

請求項２の発明は、請求項１に記載の構成において、直流母線と各負荷との間には、突入電流から負荷を保護する負荷保護回路が配置されていることを特徴とする。
この構成によれば、電源投入時に発生する突入電流から負荷を保護でき、負荷の劣化を防止できる。 The invention of claim 2 is characterized in that, in the configuration according to claim 1, a load protection circuit for protecting the load from an inrush current is arranged between the DC bus and each load.
According to this configuration, the load can be protected from the inrush current generated when the power is turned on, and the deterioration of the load can be prevented.

請求項３の発明は、請求項１又は２に記載の構成において、電源は自家発電電力を含み、自家発電電力は、逆流防止回路を含む入力保護回路を介して直流母線に重畳されることを特徴とする。
この構成によれば、自家発電装置には電流の逆流が発生しないため、自家発電装置を保護できる。 According to the invention of claim 3, in the configuration according to claim 1 or 2, the power source includes the privately generated power, and the privately generated power is superimposed on the DC bus via an input protection circuit including a backflow prevention circuit. It is a feature.
According to this configuration, since the backflow of current does not occur in the private power generation device, the private power generation device can be protected.

請求項４の発明は、請求項３に記載の構成において、入力保護回路は、逆流防止回路に加えて、アーク保護回路、サージ保護回路を具備して成ることを特徴とする。
この構成によれば、商用電力等から直流母線に流れ込んだ雷サージや、接点開閉等で発生するアークから自家発電装置を保護できる。 The invention of claim 4 is characterized in that, in the configuration according to claim 3, the input protection circuit includes an arc protection circuit and a surge protection circuit in addition to the backflow prevention circuit.
According to this configuration, it is possible to protect the private power generation device from lightning surges that flow into the DC bus from commercial power and the like, and arcs generated by opening and closing contacts.

請求項５の発明は、請求項２に記載の構成において、負荷優先順位設定回路と、負荷保護回路と、直流母線とが共通する盤に組み付けられ、盤には、電源を接続する複数の入力部、負荷を接続するための複数の出力部が設けられて成ることを特徴とする。
この構成によれば、直流連携させるための主要回路が１つの盤に収容されているため、直流連携システムの施工がし易い。 The invention of claim 5 is assembled on a board in which a load priority setting circuit, a load protection circuit, and a DC bus are common in the configuration according to claim 2, and a plurality of inputs for connecting a power supply are connected to the board. It is characterized in that a plurality of output units for connecting units and loads are provided.
According to this configuration, since the main circuit for DC cooperation is housed in one board, it is easy to construct the DC cooperation system.

請求項６の発明は、請求項５に記載の構成において、電源は蓄電池及び商用電力を含み、盤には、蓄電池の出力を所定電圧に昇圧／降圧するＤＣ／ＤＣコンバータと、商用電力を所定電圧の直流に変換するＡＣ／ＤＣコンバータが組み付けられていることを特徴とする。
この構成によれば、蓄電池の出力を昇圧／降圧するＤＣ／ＤＣコンバータと、商用電力を直流に変換するＡＣ／ＤＣコンバータが盤に組み付けられているため、蓄電池、商用電力が直接盤に接続でき、簡易な施工で済む。 According to the invention of claim 6, in the configuration according to claim 5, the power source includes a storage battery and commercial power, and the panel defines a DC / DC converter that boosts / lowers the output of the storage battery to a predetermined voltage and commercial power. It is characterized in that an AC / DC converter that converts voltage to direct current is installed.
According to this configuration, a DC / DC converter that boosts / steps down the output of the storage battery and an AC / DC converter that converts commercial power to direct current are assembled on the board, so the storage battery and commercial power can be directly connected to the board. , Simple construction is enough.

本発明によれば、供給される電力が十分でなければ、優先順位の低い所定の負荷から順に停止するため、一斉に負荷が停止する事態を防止できる。また、重要な負荷は優先順位を高く設定することで、緊急時の安全確保がし易い。
そして、自家発電電力や蓄電池に電流センサを設けて電力を監視しないため、電力を監視して制御する複雑な制御をすること無く複数の電源を連携させて直流負荷に電力を供給できる。 According to the present invention, if the power supplied is not sufficient, the loads are stopped in order from a predetermined load having a lower priority, so that it is possible to prevent a situation in which the loads are stopped all at once. In addition, it is easy to ensure safety in an emergency by setting a high priority for important loads.
Further, since the privately generated power or the storage battery is provided with a current sensor to not monitor the power, it is possible to supply power to the DC load by linking a plurality of power sources without performing complicated control for monitoring and controlling the power.

本発明に係る直流連携システムの一例を示す構成図である。It is a block diagram which shows an example of the DC cooperation system which concerns on this invention. 入力保護回路の回路図である。It is a circuit diagram of an input protection circuit. 負荷優先順位設定回路及び負荷保護回路の回路図である。It is a circuit diagram of a load priority setting circuit and a load protection circuit.

以下、本発明を具体化した実施の形態を、図面を参照して詳細に説明する。図１は本発明に係る直流連携システムの一例を示す構成図であり、主要回路は箱状に形成された盤（直流連携盤）１に組み付けられ、収容されている。
盤１には複数の入力部１１、出力部１２が設けられ、入力部１１には各種電源が接続され、出力部１２には複数の負荷２が接続されている。 Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an example of a DC cooperation system according to the present invention, and a main circuit is assembled and housed in a box-shaped board (DC cooperation board) 1.
The board 1 is provided with a plurality of input units 11 and output units 12, various power supplies are connected to the input unit 11, and a plurality of loads 2 are connected to the output unit 12.

図１では、入力部１１は第１〜第４入力部（１１ａ〜１１ｄ）の４入力部により構成され、出力部１２は第１〜第４出力部（１２ａ〜１２ｄ）の４出力部より構成されている。
そして盤１の内部には、２つの入力保護回路３、蓄電池２５の電圧を昇圧／降圧するためのＤＣ／ＤＣコンバータ４、商用電力２６を直流変換するＡＣ／ＤＣコンバータ５、入力された直流電力が重畳される直流母線６、直流母線６を保護する主幹保護回路７、負荷優先順位設定回路８、負荷保護回路９等が組み付けられている。 In FIG. 1, the input unit 11 is composed of four input units of the first to fourth input units (11a to 11d), and the output unit 12 is composed of four output units of the first to fourth output units (12a to 12d). Has been done.
Inside the board 1, two input protection circuits 3, a DC / DC converter 4 for stepping up / down the voltage of the storage battery 25, an AC / DC converter 5 for converting commercial power 26 to DC, and input DC power The DC bus 6, the main protection circuit 7 that protects the DC bus 6, the load priority setting circuit 8, the load protection circuit 9, and the like are assembled.

第１入力部１１ａ、第２入力部１１ｂは自家発電装置の入力部であり、ここでは再生可能エネルギーである太陽光発電装置２１と風力発電装置２２が接続されている。
但し、太陽光発電装置２１はＤＣ／ＤＣコンバータ２３ａを備えた制御盤２３を介して接続され、所定電圧に昇圧された直流電力が入力される。
また風力発電装置２２は、ＡＣ／ＤＣコンバータ２４ａ備えた制御盤２４を介して接続され、発電電力が所定の電圧の直流に変換されて入力される。
そして、太陽光発電装置２１が接続された第１入力部１１ａ、及び風力発電装置２２が接続された第２入力部１１ｂは、盤１内でそれぞれ入力保護回路３に接続されたのち直流母線６に接続され、入力された電力が重畳され一体化される。 The first input unit 11a and the second input unit 11b are input units of the private power generation device, and here, the solar power generation device 21 and the wind power generation device 22 which are renewable energies are connected.
However, the photovoltaic power generation device 21 is connected via a control panel 23 provided with a DC / DC converter 23a, and DC power boosted to a predetermined voltage is input.
Further, the wind power generation device 22 is connected via a control panel 24 provided with an AC / DC converter 24a, and the generated power is converted into a direct current having a predetermined voltage and input.
The first input unit 11a to which the photovoltaic power generation device 21 is connected and the second input unit 11b to which the wind power generation device 22 is connected are connected to the input protection circuit 3 in the panel 1, and then the DC bus 6 is connected. The input power is superimposed and integrated.

第３入力部１１ｃには蓄電池２５が接続され、盤１内でＤＣ／ＤＣコンバータ４により所定の直流電圧に昇圧／降圧されて直流母線６に重畳される。
第４入力部１１ｄには商用電力２６が接続され、盤１内でＡＣ／ＤＣコンバータ５により所定の直流電圧に変換されて直流母線６に重畳される。 A storage battery 25 is connected to the third input unit 11c, and is boosted / stepped down to a predetermined DC voltage by the DC / DC converter 4 in the panel 1 and superimposed on the DC bus 6.
Commercial power 26 is connected to the fourth input unit 11d, is converted into a predetermined DC voltage by the AC / DC converter 5 in the panel 1, and is superimposed on the DC bus 6.

こうして、４種類の電源による直流電力が重畳された直流母線６は、主幹保護回路７を介した後分岐され、負荷優先順位設定回路８及び負荷保護回路９を介して負荷２が接続された個々の出力部１２に接続されている。 In this way, the DC bus 6 on which the DC power of the four types of power sources is superimposed is branched after passing through the main protection circuit 7, and the load 2 is connected via the load priority setting circuit 8 and the load protection circuit 9. It is connected to the output unit 12 of.

図２は入力保護回路３の回路図である。入力保護回路３は、直流開閉器３１、アーク保護回路３２、サージ保護回路３３、逆流防止回路３４を具備している。
アーク保護回路３２は、閉路状態にある直流開閉器３１を開操作した際に発生する直流アークを抑制する回路である。コンデンサＣ１に蓄積された電荷により、直流開閉器３１を開操作した瞬間の接点間の電圧は緩やかに変化し、アークの発生が防止される。
サージ保護回路３３は、落雷等で電路に入り込んだ高電圧から電源を保護する。 FIG. 2 is a circuit diagram of the input protection circuit 3. The input protection circuit 3 includes a DC switch 31, an arc protection circuit 32, a surge protection circuit 33, and a backflow prevention circuit 34.
The arc protection circuit 32 is a circuit that suppresses a DC arc generated when the DC switch 31 in a closed circuit state is opened. Due to the electric charge accumulated in the capacitor C1, the voltage between the contacts at the moment when the DC switch 31 is opened is gradually changed, and the generation of an arc is prevented.
The surge protection circuit 33 protects the power supply from a high voltage that has entered the electric circuit due to a lightning strike or the like.

逆流防止回路３４は、順方向のみに電流が流れ、逆方向に流れないよう阻止する回路である。直流母線６に接続される電路上にＭＯＳＦＥＴから成るスイッチング素子Ｍ５が配置され、逆流発生時このスイッチング素子Ｍ５がオフする。
具体的に、電路電流が順方向に流れているとき（スイッチング素子Ｍ５がオンしているとき）、スイッチング素子Ｍ５のドレイン側とソース側の電圧をみると、ソース側の電位がドレイン側に比べて高い。このとき、トランジスタＱ１はオフ状態でコレクタ側に電源電圧が印加されている。
一方、逆方向に流れようとすると、スイッチング素子Ｍ５のソース側の電位がドレイン側に比べて低くなる。このとき、トランジスタＱ１はオンしてスイッチング素子Ｍ５のゲート電圧がゼロになる。こうして、スイッチング素子Ｍ５はオフして逆方向の流れが防止される。 The backflow prevention circuit 34 is a circuit that prevents current from flowing only in the forward direction and does not flow in the reverse direction. A switching element M5 made of MOSFET is arranged on the electric circuit connected to the DC bus 6, and the switching element M5 is turned off when backflow occurs.
Specifically, when the electric circuit current is flowing in the forward direction (when the switching element M5 is on), the voltage on the drain side and the source side of the switching element M5 is higher than that on the drain side. Is expensive. At this time, the power supply voltage is applied to the collector side in the off state of the transistor Q1.
On the other hand, when the flow is attempted in the opposite direction, the potential on the source side of the switching element M5 becomes lower than that on the drain side. At this time, the transistor Q1 is turned on and the gate voltage of the switching element M5 becomes zero. In this way, the switching element M5 is turned off to prevent the flow in the reverse direction.

図３は負荷優先順位設定回路８、負荷保護回路９の回路図であり、これらの回路は直流母線６から分岐した負荷電路６ａに設けられている。尚、１０は負荷優先順位設定回路８及び負荷保護回路９の電源回路である。
負荷優先順位設定回路８は、ボリューム抵抗ＶＲ１、コンパレータＩＣ１−１、ＭＯＳＦＥＴから成るスイッチング素子Ｍ１−１を主要素子として構成されている。
ボリューム抵抗ＶＲ１を調整してコンパレータＩＣ１−１への電圧指令値を設定し、コンパレータＩＣ１−１出力の「Ｈｉ」或いは「Ｌｏ」の出力の閾値が設定される。こうして、直流母線６の電圧の変化に応じて負荷２への出力がオン／オフ操作され、ボリューム抵抗ＶＲ１の操作により負荷の優先順位が設定される。 FIG. 3 is a circuit diagram of the load priority setting circuit 8 and the load protection circuit 9, and these circuits are provided in the load electric circuit 6a branched from the DC bus 6. Reference numeral 10 denotes a power supply circuit for the load priority setting circuit 8 and the load protection circuit 9.
The load priority setting circuit 8 is configured with a switching element M1-1 including a volume resistor VR1, a comparator IC1-1, and a MOSFET as a main element.
The volume resistor VR1 is adjusted to set the voltage command value to the comparator IC1-1, and the threshold value of the output of "Hi" or "Lo" of the output of the comparator IC1-1 is set. In this way, the output to the load 2 is turned on / off according to the change in the voltage of the DC bus 6, and the priority of the load is set by the operation of the volume resistor VR1.

ボリューム抵抗ＶＲ１の操作によりコンパレータＩＣ１−１の「＋」入力を上げると直流母線６の電圧変動に対して広いレンジで「Ｈｉ」信号を出力し、結果高い優先順位となる。一方、ボリューム抵抗ＶＲ１の操作によりコンパレータＩＣ１−１の「＋」入力を下げると直流母線６の電圧変動に対して狭いレンジで「Ｈｉ」信号を出力し、結果低い優先順位となる。 When the "+" input of the comparator IC1-1 is raised by operating the volume resistor VR1, a "Hi" signal is output in a wide range with respect to the voltage fluctuation of the DC bus 6, resulting in a high priority. On the other hand, when the "+" input of the comparator IC1-1 is lowered by operating the volume resistor VR1, a "Hi" signal is output in a narrow range with respect to the voltage fluctuation of the DC bus 6, resulting in a low priority.

負荷保護回路９は、抵抗（突入防止抵抗）Ｒ１７、ＭＯＳＦＥＴから成るスイッチング素子Ｍ１−１、Ｍ１−２、ツェナーダイオードＺＤ５、トランジスタＱ１０１−１を主要素子として構成されている。突入防止抵抗Ｒ１７により、電源投入時に負荷２に容量成分が存在した場合に発生する突入電流が制限される。 The load protection circuit 9 is composed of a resistor (rush prevention resistor) R17, switching elements M1-1 and M1-2 composed of MOSFETs, a Zener diode ZD5, and a transistor Q101-1 as main elements. The inrush prevention resistor R17 limits the inrush current generated when a capacitance component is present in the load 2 when the power is turned on.

具体的に、電源投入時、スイッチング素子Ｍ１−１がオンし、負荷電流が流れる。このとに突入防止抵抗Ｒ１７、スイッチング素子Ｍ１−１に負荷電流が流れる。
このとき、スイッチング素子Ｍ１−２はオフしているが、突入電流が減少して行き、突入防止抵抗Ｒ１７にかかる電圧がツェナーダイオードＺＤ５の電圧以下になると、トランジスタＱ１０１−１がオンし、スイッチング素子Ｍ１−２がオンする。すると、スイッチング素子Ｍ１−１はゲート電圧がゼロになるためオフし、電路電流（直流母線６の分岐電流）は、スイッチング素子Ｍ１−２を通り、突入防止抵抗Ｒ１７を通らない。
こうして、電源投入時のみ突入防止抵抗Ｒ１７を介して電路電流が流れることで、突入電流が制限される。 Specifically, when the power is turned on, the switching element M1-1 is turned on and a load current flows. A load current flows through the inrush prevention resistor R17 and the switching element M1-1.
At this time, the switching element M1-2 is off, but when the inrush current decreases and the voltage applied to the inrush prevention resistor R17 becomes equal to or lower than the voltage of the Zener diode ZD5, the transistor Q101-1 is turned on and the switching element is turned on. M1-2 turns on. Then, the switching element M1-1 is turned off because the gate voltage becomes zero, and the electric circuit current (branch current of the DC bus 6) passes through the switching element M1-2 and does not pass through the inrush prevention resistor R17.
In this way, the inrush current is limited by the electric circuit current flowing through the inrush prevention resistor R17 only when the power is turned on.

このように、負荷優先順位設定回路８を備えるため、供給される電力が低下すると、優先順位が低く設定された負荷２から順に停止するため、一斉に負荷２が停止する事態を防止できる。一方、極力停止を回避したい負荷２は優先順位を高く設定することで、安全確保がし易い。
そして、自家発電電力や蓄電池２５に電流センサを設けて電力を監視しないため、電力を監視して制御する複雑な制御をすること無く複数の電源を連携させて直流負荷に電力を供給できる。
また、負荷保護回路９により、電源投入時に発生する突入電流から負荷２を保護でき、負荷２の劣化を防止できる。
更に、入力保護回路３により自家発電装置には電流の逆流が発生しないため、自家発電装置を保護できるし、商用電力等から直流母線６に流れ込んだ雷サージや、接点開閉等で発生するアークから自家発電装置を保護できる。
また、直流連携させるための主要回路が１つの盤１に収容されているため、直流連携システムの施工がし易いし、盤１には更に蓄電池２５の出力を昇圧／降圧するＤＣ／ＤＣコンバータ４と、商用電力２６を直流に変換するＡＣ／ＤＣコンバータ５も組み付けられているため、蓄電池２５、商用電力２６を直接盤１に接続でき、更に簡易な施工で済む。 Since the load priority setting circuit 8 is provided in this way, when the supplied power decreases, the loads 2 are stopped in order from the load 2 set with the lower priority, so that the situation in which the loads 2 are stopped all at once can be prevented. On the other hand, it is easy to ensure safety by setting a high priority for the load 2 that wants to avoid stopping as much as possible.
Further, since the privately generated electric power or the storage battery 25 is provided with a current sensor to not monitor the electric power, it is possible to supply the electric power to the DC load by linking a plurality of power sources without performing complicated control for monitoring and controlling the electric power.
Further, the load protection circuit 9 can protect the load 2 from the inrush current generated when the power is turned on, and can prevent the load 2 from deteriorating.
Further, since the input protection circuit 3 does not generate a backflow of current in the private power generation device, the private power generation device can be protected from lightning surges flowing into the DC bus 6 from commercial power or the like, or arcs generated by contact opening / closing. You can protect your own power generator.
Further, since the main circuit for direct current cooperation is housed in one board 1, it is easy to construct the DC cooperation system, and the board 1 further boosts / lowers the output of the storage battery 25. Since the AC / DC converter 5 that converts the commercial power 26 to direct current is also assembled, the storage battery 25 and the commercial power 26 can be directly connected to the panel 1, and the construction is simpler.

尚、上記実施形態では、自家発電電力、蓄電池２５、及び商用電力２６の３種類の電源を直流母線６に重畳して負荷２に供給しているが、３種類に限定するもので無く、何れか２種類の電源のみを直流母線６に重畳させても良い。
また、主要回路を盤１内に組み付けてシステムを構成しているが、自家発電電力の入力保護回路３と蓄電池２５のＤＣ／ＤＣコンバータ４は、発電している場所や蓄電池２５の設置場所に分散配置しても良い。その場合、それらの出力を盤１の直流母線６に接続すれば良い。
更に、商用電力２６を直流変換するＡＣ／ＤＣコンバータ５を盤１から独立させても良いし、逆に太陽光発電装置２１の制御盤２３、風力発電装置２２の制御盤２４を盤１と一体に形成しても良い。
また、自家発電装置として再生可能エネルギーである太陽光発電装置２１と風力発電装置２２を備えているが、何れか一方のみでも良いし他の発電設備であっても良い。 In the above embodiment, three types of power sources, privately generated power, storage battery 25, and commercial power 26, are superimposed on the DC bus 6 and supplied to the load 2, but the power is not limited to the three types. Alternatively, only two types of power sources may be superimposed on the DC bus 6.
Further, although the main circuit is assembled in the panel 1 to form the system, the input protection circuit 3 of the privately generated power and the DC / DC converter 4 of the storage battery 25 are located at the place where the power is generated or the storage battery 25 is installed. It may be distributed. In that case, those outputs may be connected to the DC bus 6 of the board 1.
Further, the AC / DC converter 5 that converts the commercial power 26 into direct current may be made independent from the board 1, and conversely, the control board 23 of the photovoltaic power generation device 21 and the control board 24 of the wind power generation device 22 are integrated with the board 1. It may be formed in.
Further, although the private power generation device includes a solar power generation device 21 and a wind power generation device 22 which are renewable energies, only one of them may be used or another power generation facility may be used.

１・・盤、２・・負荷、３・・入力保護回路、４・・ＤＣ／ＤＣコンバータ、５・・ＡＣ／ＤＣコンバータ、６・・直流母線、６ａ・・負荷電路、７・・主幹保護回路、８・・負荷優先順位設定回路、９・・負荷保護回路、１１・・入力部、１２・・出力部、２１・・太陽光発電装置、２２・・風力発電装置、２３ａ・・ＤＣ／ＤＣコンバータ、２４ａ・・ＡＣ／ＤＣコンバータ、２５・・蓄電池、２６・・商用電力、３２・・アーク保護回路、３３・・サージ保護回路、３４・・逆流防止回路。 1 ... board, 2 ... load, 3 ... input protection circuit, 4 ... DC / DC converter, 5 ... AC / DC converter, 6 ... DC bus, 6a ... load circuit, 7 ... main protection Circuit, 8 ... Load priority setting circuit, 9 ... Load protection circuit, 11 ... Input section, 12 ... Output section, 21 ... Solar power generation device, 22 ... Wind power generation device, 23a ... DC / DC converter, 24a ... AC / DC converter, 25 ... storage battery, 26 ... commercial power, 32 ... arc protection circuit, 33 ... surge protection circuit, 34 ... backflow prevention circuit.

Claims (6)

自家発電電力、蓄電池、及び商用電力の３種類のうち、少なくとも２種類の電力を電源として、所定電圧の直流に変換して直流母線に重畳させて統合し、統合した直流電力を複数の負荷に供給する直流連携システムであって、
前記直流母線を分岐して前記負荷に電力を供給する負荷電路には、負荷毎に優先順位を設定する負荷優先順位設定回路が設けられており、
供給される電力が低下すると、優先順位が低く設定された負荷から電力の供給が停止されることを特徴とする直流連携システム。 Of the three types of privately generated power, storage battery, and commercial power, at least two types of power are used as the power source, converted to DC at a predetermined voltage, superimposed on the DC bus, and integrated, and the integrated DC power is combined into multiple loads. It is a DC cooperation system to supply
A load priority setting circuit for setting a priority for each load is provided in a load electric circuit that branches the DC bus to supply electric power to the load.
A DC linkage system characterized in that when the power supplied decreases, the power supply is stopped from a load set with a low priority. 前記直流母線と各負荷との間には、突入電流から負荷を保護する負荷保護回路が配置されていることを特徴とする請求項１記載の直流連携システム。 The DC linkage system according to claim 1, wherein a load protection circuit that protects the load from an inrush current is arranged between the DC bus and each load. 前記電源は前記自家発電電力を含み、前記自家発電電力は、逆流防止回路を含む入力保護回路を介して前記直流母線に重畳されることを特徴とする請求項１又は２記載の直流連携システム。 The DC cooperation system according to claim 1 or 2, wherein the power source includes the self-generated power, and the self-generated power is superimposed on the DC bus via an input protection circuit including a backflow prevention circuit. 前記入力保護回路は、前記逆流防止回路に加えて、アーク保護回路、サージ保護回路を具備して成ることを特徴とする請求項３記載の直流連携システム。 The DC linkage system according to claim 3, wherein the input protection circuit includes an arc protection circuit and a surge protection circuit in addition to the backflow prevention circuit. 前記負荷優先順位設定回路と、前記負荷保護回路と、前記直流母線とが共通する盤に組み付けられ、
前記盤には、前記電源を接続する複数の入力部、負荷を接続するための複数の出力部が設けられて成ることを特徴とする請求項２記載の直流連携システム。 The load priority setting circuit, the load protection circuit, and the DC bus are assembled on a common board.
The DC linkage system according to claim 2, wherein the panel is provided with a plurality of input units for connecting the power supply and a plurality of output units for connecting the load. 前記電源は前記蓄電池及び前記商用電力を含み、前記盤には、前記蓄電池の出力を所定電圧に昇圧／降圧するＤＣ／ＤＣコンバータと、前記商用電力を所定電圧の直流に変換するＡＣ／ＤＣコンバータが組み付けられていることを特徴とする請求項５記載の直流連携システム。 The power source includes the storage battery and the commercial power, and the panel includes a DC / DC converter that boosts / lowers the output of the storage battery to a predetermined voltage, and an AC / DC converter that converts the commercial power into a direct current of a predetermined voltage. The DC linkage system according to claim 5, wherein the DC linkage system is assembled.
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