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WO2013031673A1 - Circuit de détection de coupure et système de production d'énergie pourvu de ce dernier - Google Patents

Circuit de détection de coupure et système de production d'énergie pourvu de ce dernier Download PDF

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Publication number
WO2013031673A1
WO2013031673A1 PCT/JP2012/071404 JP2012071404W WO2013031673A1 WO 2013031673 A1 WO2013031673 A1 WO 2013031673A1 JP 2012071404 W JP2012071404 W JP 2012071404W WO 2013031673 A1 WO2013031673 A1 WO 2013031673A1
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WO
WIPO (PCT)
Prior art keywords
interruption
detection circuit
state
shut
breaker
Prior art date
Application number
PCT/JP2012/071404
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English (en)
Japanese (ja)
Inventor
廣瀬　貴司
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to JP2013531276A priority Critical patent/JP5652898B2/ja
Publication of WO2013031673A1 publication Critical patent/WO2013031673A1/fr

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/95—Circuit arrangements
    • H10F77/953—Circuit arrangements for devices having potential barriers
    • H10F77/955—Circuit arrangements for devices having potential barriers for photovoltaic devices

Definitions

  • the present invention relates to a shut-off detection circuit that detects whether or not the shut-off means is in a shut-off state, and a power generation system including the same.
  • solar cells photoelectric conversion elements that directly convert solar energy into electrical energy
  • next-generation energy sources particularly from the viewpoint of global environmental problems and the danger of nuclear power generation.
  • single crystal silicon, polycrystalline silicon, amorphous silicon, or the like is used for the solar cell, but the present invention is not limited to this, and a compound semiconductor or an organic material may be used.
  • the number of solar panels 100 included in each solar string 110 in the solar array 120 is different, but this is for convenience of illustration.
  • the number of solar panels 100 included in the string 110 may be the same.
  • the conventional solar cell system has a configuration in which disconnection means such as a fuse, a breaker, and a switch for safety and maintenance are connected in series at each node.
  • disconnection means such as a fuse, a breaker, and a switch for safety and maintenance are connected in series at each node.
  • a shut-off detection circuit for detecting whether or not the shut-off means is in a shut-off state is provided.
  • FIG. 13 is a diagram showing a conventional interruption detection circuit.
  • the input side and the output side are connected by high resistances 920 and 920 of about several M ⁇ , and the interruption means 910 is connected by the connection voltage of the high resistances 920 and 920. It was detected whether or not it was in a cut-off state. Specifically, if the shut-off means 910 is in the shut-off state, there is no potential difference between the input voltage and the voltage at the bus bar 930 (very small), whereas if the shut-off means 910 is not in the shut-off state, the input voltage and the bus bar 930 A potential difference from the voltage at (1) is generated (increased). Using this characteristic, it is detected whether or not the blocking means 910 is in the blocking state.
  • insulation resistance measurement is performed to check whether the positive electrode and the negative electrode are grounded for each solar cell string.
  • the string blocking means for measuring the insulation resistance is blocked and the measurement is performed separately from the other strings.
  • the interruption means is provided for each node.
  • each input is connected via a resistance of several M ⁇ even when the path is interrupted by the interruption means. It will be connected in parallel.
  • the insulation resistance measurement of the surrounding input lines has a great influence on the results, it is not particularly desirable to measure the insulation resistance. There is a problem in that a normal characteristic cannot be measured in the interruption detection circuit.
  • the present invention provides an interruption detection circuit capable of determining whether or not an interruption means is in an interruption state without affecting other circuits connected in parallel, and an electric power generation including the same.
  • the purpose is to provide a system.
  • a shutoff detection circuit comprises a shutoff means for shutting off power supply from a power generator to a bus bar, and is connected to at least one of the shutoff means on the power generator side and the bus bar side.
  • a shut-off state detection circuit is provided for detecting a shut-off state of the shut-off means, and a shut-off state detection circuit that does not flow a direct current from the power generation device side to the bus bar side when the shut-off means enters the shut-off state is provided. .
  • the interruption detection circuit of the present invention is configured such that the interruption state detection circuit is connected to the power generation device and the bus bar and blocks a DC component on a path connecting the power generation device and the bus bar. It is desirable to include an element.
  • the element that cuts off the direct current component is included on the path connecting the power generation device and the buster. Therefore, the direct current from the power generator does not flow to the bus bar via the cutoff state detection circuit.
  • the interruption state detection circuit is preferably connected in series with the interruption means.
  • the interruption state detection circuit is not provided between the interruption means and the bus bar, it is possible to prevent a voltage drop from occurring when the interruption means is not in the interruption state.
  • the interruption detection circuit of the present invention is characterized in that the interruption state detection circuit flows between a first terminal, a second terminal, and the first terminal and the second terminal.
  • a transistor having a control terminal for controlling a current wherein the first terminal is connected to the bus bar, and the control terminal is connected to one end to which the DC voltage from the power generator is supplied in the blocking means.
  • the interruption detection circuit of the present invention is characterized in that the interruption state detection circuit includes a capacitor, and one end of the capacitor is connected to one end to which the DC voltage from the power generator is supplied in the interruption means. It is desirable to detect the cutoff state of the cutoff means based on the voltage at the other end of the capacitor.
  • the control terminal of the transistor is preferably connected to the shutoff means via a capacitor.
  • the control terminal of the transistor or the one end of the capacitor is connected to the shutoff means via a resistor.
  • the interruption detection circuit according to the present invention is characterized in that the interruption state detection circuit is battery-coupled to a primary coil provided between the power generation device and the interruption means, and to the primary coil. It is desirable to detect the interruption
  • the interruption detection circuit of the present invention is characterized in that the interruption state detection circuit has a current detection means for detecting a current between the interruption means and the bus bar, and the current detection means It is desirable to detect the blocking state of the blocking means based on whether or not it is detected.
  • the power generation system of the present invention includes the power generation device and any one of the interruption detection circuits described above.
  • the present invention it is possible to detect whether or not the blocking means is in a blocking state.
  • the direct current from the power generator does not flow to the bus bar via the cutoff state detection circuit when the cutoff means is in the cutoff state, the maintainability and insulation of other circuits connected in parallel are reduced. The accuracy of resistance measurement is not impaired.
  • the present invention is provided with a blocking means in a path for supplying an output voltage (DC voltage) from a power generator to a bus bar, and further includes a blocking state detection circuit for detecting (monitoring) a blocking state of the blocking means.
  • the present invention relates to an interruption detection circuit.
  • the interruption state detection circuit detects that the interruption means is in the interruption state when the interruption means is in the interruption state.
  • the shut-off state of the shut-off means is detected in such a manner that direct current is not supplied to the bus bar from the power generator via itself (shut-off state detection circuit).
  • shut-off state detection circuit In other words, when the shut-off means is in the shut-off state, there is a direct current path (path through which direct current flows) from the power generator to the bus bar via the shut-off state detection circuit between the power generator and the bus bar. do not do.
  • the bus bar is a connection conductor (wiring material) that connects a plurality of input terminals and output terminals. More specifically, the bus bar is connected to, for example, current collecting electrodes of a plurality of sunlight strings, collects the outputs of the plurality of sunlight strings, and outputs them with a number smaller than the number of inputs.
  • the shape of the bus bar is not particularly limited, but is generally formed in a flat plate shape, and it is desirable to increase the cross-sectional area in order to suppress a voltage drop due to the bus bar.
  • blocking means is an operation
  • the shut-off means is not in the shut-off state (the shut-off means is not shutting off (conducting) the DC voltage from the power generator to the bus bar), and the shut-off means is not in the operating state (not working).
  • FIG. 1 is a diagram illustrating a configuration of a cutoff detection circuit according to a first embodiment of the present invention.
  • the interruption detection circuit 200 includes a breaker 210 as an interruption means, resistors 220 and 220, and an enhancement type NMOS transistor (hereinafter, “enhancement type NMOS transistor” is referred to as “E type NMOS”) 230.
  • the breaker 210 is supplied at one end with an output voltage (DC voltage) from a power generator (hereinafter, a solar panel shown in FIG. 10 as an example of the power generator), and the other end is electrically connected to the bus bar 240.
  • DC voltage output voltage
  • the source terminal (first terminal) of the E-type NMOS 230 is electrically connected to the bus bar 240, the gate terminal (control terminal) is connected to the breaker 210, and the drain terminal (second terminal) is connected via the resistors 220 and 220. Connected to ground.
  • blocking detection circuit shown to this embodiment and the following embodiment is good also as providing in any position if it is a position which can detect the interruption
  • it may be provided in the junction box 130 and / or the power conditioner 140 shown in FIG.
  • the power conditioner 140 performs maximum power point tracking control (MPPT control) in order to maximize the generated power of the solar cell panel.
  • MPPT control maximum power point tracking control
  • the shut-off means is in the shut-off state when the power conditioner 140 is operating, the bus bar voltage is input in parallel and becomes the maximum power point voltage in the MPPT control of the string that is not in the shut-off state. This maximum power point voltage is lower than the open-circuit voltage that is the voltage across the string in the cut-off state.
  • a breaker is described as an example of a breaker, but the breaker is not limited to a breaker, but a short circuit such as a fuse, a switch, an electromagnetic switch, or an electromagnetic contactor, an overcurrent It is possible to use a circuit breaker that breaks the circuit when an accident occurs.
  • FIG. 2 is a diagram showing an output signal waveform of the interruption detection circuit of the present embodiment. From time t 0 to t 1 , the breaker 210 is not in the cut-off state, and after time t 1 , the breaker 210 is in the cut-off state. As shown in FIG.
  • the output signal of the drain of the E-type NMOS 230 divided by the resistors 220 and 220 is at a low level (L level).
  • the source potential at this time is higher than the common potential (ground potential), but the potential difference between the source potential and the common potential is such that the E-type NMOS 230 is not broken (that is, between the source potential and the common potential).
  • the potential difference is less than the source-drain breakdown voltage).
  • the gate voltage of the E-type NMOS 230 becomes equal to the open-circuit voltage of the solar panel. Therefore, since the potential difference between the gate and source of the E-type NMOS 230 exceeds the absolute value of the threshold voltage, a current flows between the drain and source of the E-type NMOS 230. As a result, as shown in FIG. 2, when the breaker 210 is in the cut-off state, the output signal of the drain of the E-type NMOS 230 divided by the resistors 220 and 220 becomes a high level (H level).
  • the output signal of the drain of the E-type NMOS 230 divided by the resistors 220 and 220 is detected (monitored), and the level of the output signal changes from the L level to the H level.
  • the breaker 210 is in an interrupted state.
  • the output signal is converted into digital data by a power converter (not shown) (for example, an A / D converter) and output to a microcomputer (not shown).
  • the microcomputer can detect whether or not the blocking means is in a blocking state based on the digital data (the same applies to the following embodiments).
  • the direct current from the power generator does not flow to the bus bar via the cutoff state detection circuit when the cutoff means is in the cutoff state, the maintainability and insulation of other circuits connected in parallel are reduced. The accuracy of resistance measurement is not impaired.
  • FIG. 3 is a diagram showing the configuration of the interruption detection circuit according to the second embodiment of the present invention.
  • the interruption detection circuit 300 includes a breaker 310 as an interruption means, resistors 320 and 320, and a depletion type PMOS transistor (hereinafter, “depletion type PMOS transistor” is referred to as “D type PMOS”) 330.
  • the breaker 310 is supplied with an output voltage (DC voltage) from the solar panel at one end and is electrically connected to the bus bar 340 at the other end.
  • the source terminal of the D-type PMOS 330 is electrically connected to the bus bar 340, the gate terminal is electrically connected to the breaker 310, and the drain terminal is connected to the ground via the resistors 320 and 320.
  • the D-type PMOS 330 has a potential difference between the gate and the source of the D-type PMOS 330 that is equal to or less than the absolute value of the threshold voltage during normal operation, that is, when the breaker 310 is not in the cutoff state. . Therefore, the conduction state between the gate and the source of the D-type PMOS 330 is maintained, and a current flows between the drain and the source of the D-type PMOS 230.
  • FIG. 4 is a diagram showing an output signal waveform of the interruption detection circuit of the present embodiment.
  • the breaker 310 is not in the cut-off state, and after time t 1 , the breaker 310 is in the cut-off state.
  • the output signal of the drain of the D-type PMOS 330 divided by the resistors 320 and 320 is at the H level.
  • the potential difference between the source potential and the common potential is not more than the source-drain breakdown voltage.
  • the gate voltage of the D-type PMOS 330 becomes equal to the open-circuit voltage of the solar panel. Therefore, since the potential difference between the gate potential and the source potential of the D-type PMOS 330 exceeds the absolute value of the threshold voltage, no current flows between the drain and the source of the D-type PMOS 330. Therefore, as shown in FIG. 4, when the breaker 310 is in the cut-off state, the output signal of the drain of the D-type PMOS 330 divided by the resistors 320 and 320 becomes L level.
  • the interruption detection circuit 300 of this embodiment the output signal of the drain of the D-type PMOS 330 is detected (monitored), and the breaker 310 is in the interruption state when the level of the output signal changes from the H level to the L level. Can be detected.
  • the direct current from the power generation device does not flow to the bus bar via the interruption state detection circuit when the interruption means is not in the interruption state, the maintainability of other circuits connected in parallel and the insulation resistance measurement are reduced. There is no loss of accuracy.
  • the voltage required for the operation can be reduced and low voltage operation can be realized.
  • FIG. 5 is a diagram showing the configuration of the interruption detection circuit according to the third embodiment of the present invention.
  • the interruption detection circuit 400 includes a breaker 410 as an interruption means, resistors 420a and 420b, and a capacitor 430.
  • the breaker 410 has one end supplied with an output voltage from the solar panel and the other end electrically connected to the bus bar 440.
  • Capacitor 430 has one end electrically connected to breaker 410 and the other end connected to a bus bar via resistor 420a and to ground via 420b.
  • FIG. 6 is a diagram showing an output signal waveform of the interruption detection circuit of the present embodiment. From time t 0 to t 1 , the breaker 410 is not in the cut-off state, and after time t 1 , the breaker 410 is in the cut-off state.
  • the output signal from the capacitor 430 is a constant output signal as shown in FIG. 6 because there is no voltage fluctuation during normal operation, that is, when the breaker 410 is not in the interruption state.
  • the input voltage to the capacitor 430 becomes equal to the open-circuit voltage of the solar panel, so that a voltage fluctuation of about several tens to several hundreds V occurs, and FIG. As shown, the output signal changes temporarily.
  • the interruption detection circuit 400 of this embodiment detects (monitors) the output signal of the capacitor 430, and can detect that the breaker 410 is in the interruption state when the output signal that has been constant fluctuates. .
  • the path through which the direct current flows when the interrupting means is in the interrupted state is closed, the maintainability of other circuits connected in parallel and the accuracy of the insulation resistance measurement are not impaired.
  • a common parallel output voltage may be used as the voltage used for the output signal in the third embodiment, or a separately created voltage may be used.
  • FIG. 7 is a diagram showing the configuration of the interruption detection circuit according to the fourth embodiment of the present invention.
  • the interruption detection circuit 500 includes a breaker 510 as an interruption means and an ammeter 520 as an electric current detection means.
  • the ammeter 520 is connected in series with the breaker 510. That is, the breaker 510 is supplied with an output voltage from the solar panel at one end and is electrically connected to the bus bar 540 through the ammeter 520 at the other end.
  • FIG. 9 is a diagram showing an output signal waveform of the interruption detection circuit of the present embodiment.
  • the breaker 510 is not in the interruption state from time t 0 to t 1 , and the breaker 510 is in the interruption state after time t 1 . Since the interruption detection circuit 500 is in a normal operation, that is, when the breaker 510 is not in the interruption state, an electric current flows, so the ammeter 520 detects a constant current value as shown in FIG. On the other hand, when the breaker 510 is in the cut-off state, current does not flow to the ammeter 520, so that the current value cannot be detected as shown in FIG.
  • the current value detected by the ammeter 520 can be monitored, and when the current cannot be detected, it can be detected that the breaker 520 is in the interruption state. .
  • the direct current from the power generator does not flow to the bus bar via the interruption state detection circuit when the interruption means is in the interruption state, the maintainability of other circuits connected in parallel and the insulation resistance are reduced. There is no loss of measurement accuracy.
  • the ammeter 520 is used as the current detection means.
  • current detection means current detection circuit
  • FIG. 8 is a diagram showing a configuration of a shutoff detection circuit of another example of the fourth embodiment.
  • the interruption detection circuit 500 includes a breaker 510 as an interruption means, a shunt resistor 530, and an operational amplifier 550.
  • the breaker 510 and the shunt resistor 530 are connected in series.
  • the breaker 510 has one end supplied with an output voltage from the solar panel, and the other end electrically connected to the bus bar 540 via the shunt resistor 530.
  • the operational amplifier 550 inputs a potential difference between both ends of the shunt resistor 530.
  • the interruption detection circuit 500 has a voltage drop at both ends of the shunt resistor 530 connected in series with the breaker 510 because current flows when the breaker 510 is not in an interruption state during normal operation. appear.
  • the breaker 510 is in the cut-off state, no current flows through the shunt resistor 530, so that the potentials at both ends of the shunt resistor 530 are the same.
  • the voltages at both ends of the shunt resistor 530 can be compared to detect that the breaker 510 is in the interruption state when the same potential is reached.
  • the direct current from the power generator does not flow to the bus bar via the interruption state detection circuit when the interruption means is in the interruption state, the maintainability of other circuits connected in parallel and the insulation resistance are reduced. There is no loss of measurement accuracy.
  • FIG. 10 is a diagram showing the configuration of the interruption detection circuit according to the fifth embodiment of the present invention.
  • Breakage detection circuit 600 includes a breaker 610 as a breaker, resistors 620 and 620, a primary coil 630, and a secondary coil 640.
  • the breaker 610 is supplied at one end with an output current from the solar panel via the primary coil 630, and the other end is electrically connected to the bus bar 650.
  • the primary coil 630 and the secondary coil 640 are disposed to face each other (in addition, they may not be disposed to face each other as long as they are battery-coupled).
  • An electromotive force is induced in the secondary coil 640 by the inductive action, and a current due to the electromotive force flows through the resistors 620 and 620.
  • FIG. 11 is a diagram illustrating an output signal waveform of the interruption detection circuit according to the present embodiment.
  • the breaker 610 is not in the interruption state from time t 0 to t 1 , and the breaker 610 is in the interruption state after time t 1 .
  • the current flows, but the rate of change of the current is almost constant, so the electromotive force generated in the primary coil 630 is not large. Therefore, since the influence on the electromotive force induced by the primary coil 630 and generated in the secondary coil 640 is small, the output signal of the secondary coil 640 is constant as shown in FIG.
  • the interruption detection circuit 600 of the present embodiment detects (monitors) the output signal of the secondary coil 640 and detects that the breaker 610 is in the interruption state when the constant output signal fluctuates. Can do.
  • the direct current from the power generator does not flow to the bus bar via the interruption state detection circuit when the interruption means is in the interruption state, the maintainability of other circuits connected in parallel and the insulation resistance are reduced. There is no loss of measurement accuracy.
  • the input voltage is directly received by the gate of the E-type NMOS or the gate of the D-type PMOS.
  • each gate receives the input voltage via a resistor, a capacitor, or the like. Also good.
  • the input voltage is directly received by the capacitor.
  • the capacitor may receive the input voltage via a resistor or the like.
  • an E-type NMOS or D-type PMOS is used as a transistor
  • the present invention is not limited to this.
  • a bipolar transistor may be used.
  • the input voltage may be received at the base of the bipolar transistor, or as described above, the input voltage may be received at the base of the bipolar transistor via a resistor or a capacitor.
  • the present invention can be used for a shut-off detection circuit that detects whether or not the shut-off means is in a shut-off state and a power generation system including the same.

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Abstract

La présente invention se rapporte à un circuit de détection de coupure pourvu : d'un moyen de coupure destiné à couper l'alimentation électrique provenant d'un dispositif de production d'énergie à une barre omnibus ; et d'un circuit de détection de l'état de coupure qui est raccordé au côté dispositif de production d'énergie et/ou au côté barre omnibus du moyen de coupure afin de détecter l'état de coupure du moyen de coupure, et qui ne transmet pas le courant continu depuis le côté dispositif de production d'énergie jusqu'au côté barre omnibus lorsque le moyen de coupure se trouve dans un état de coupure.
PCT/JP2012/071404 2011-08-26 2012-08-24 Circuit de détection de coupure et système de production d'énergie pourvu de ce dernier WO2013031673A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013531276A JP5652898B2 (ja) 2011-08-26 2012-08-24 遮断検出回路及びこれを備える発電システム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011184630 2011-08-26
JP2011-184630 2011-08-26

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WO2013031673A1 true WO2013031673A1 (fr) 2013-03-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002091586A (ja) * 2000-09-19 2002-03-29 Canon Inc 太陽光発電装置およびその制御方法
JP2006012632A (ja) * 2004-06-25 2006-01-12 Matsushita Electric Works Ltd 表示付スイッチ用点灯回路
WO2007125867A1 (fr) * 2006-04-24 2007-11-08 Sharp Kabushiki Kaisha Systeme de generation d'energie photovoltaique et procede de commande de systeme de generation d'energie photovoltaique
JP2011119579A (ja) * 2009-12-07 2011-06-16 Toshiba Corp 太陽光発電システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002091586A (ja) * 2000-09-19 2002-03-29 Canon Inc 太陽光発電装置およびその制御方法
JP2006012632A (ja) * 2004-06-25 2006-01-12 Matsushita Electric Works Ltd 表示付スイッチ用点灯回路
WO2007125867A1 (fr) * 2006-04-24 2007-11-08 Sharp Kabushiki Kaisha Systeme de generation d'energie photovoltaique et procede de commande de systeme de generation d'energie photovoltaique
JP2011119579A (ja) * 2009-12-07 2011-06-16 Toshiba Corp 太陽光発電システム

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