CN103780071A - Overvoltage protective device and photovoltaic power generation system - Google Patents
Overvoltage protective device and photovoltaic power generation system Download PDFInfo
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- CN103780071A CN103780071A CN201410028531.1A CN201410028531A CN103780071A CN 103780071 A CN103780071 A CN 103780071A CN 201410028531 A CN201410028531 A CN 201410028531A CN 103780071 A CN103780071 A CN 103780071A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses an overvoltage protective device and a photovoltaic power generation system. The overvoltage protective device is connected between a photovoltaic substrate set string and a photovoltaic inverter. The overvoltage protective device comprises a first control unit and a protective unit, wherein the first control unit is connected to the protective unit, and is used for controlling the protective unit to be started to protect the photovoltaic inverter when an open-circuit voltage of the photovoltaic substrate set string is larger than the maximum input voltage of the photovoltaic inverter. According to the overvoltage protective device and the photovoltaic power generation system, the photovoltaic inverter can be prevented from being damaged under the condition of input overvoltage of the photovoltaic inverter, and an input overvoltage protection function can be performed to the photovoltaic inverter.
Description
Technical field
The present invention relates to power protection field, relate in particular to a kind of over-pressure safety device and photovoltaic generating system.
Background technology
In photovoltaic generating system, the direct voltage being produced by photovoltaic substrate group string, need be transformed into alternating voltage by photovoltaic DC-to-AC converter, then just can transmit or offer user and use.
At present, photovoltaic substrate group is ganged up and is often directly connected with photovoltaic DC-to-AC converter.Because the input voltage of the photovoltaic DC-to-AC converter of every kind of specification has certain scope, when the scope that exceedes permission when input voltage exceedes its maximum input voltage, photovoltaic DC-to-AC converter is damaged possibly.Therefore, in the operation instructions of photovoltaic DC-to-AC converter, have special word to emphasize that the open circuit voltage of photovoltaic substrate group string can not exceed the maximum input voltage of photovoltaic DC-to-AC converter, otherwise the photovoltaic DC-to-AC converter causing thus damage and does not belong to warranty coverage.But, if user in the process of installing, carefully do not see operation instructions or exceed the maximum input voltage of photovoltaic DC-to-AC converter because counting loss causes the open circuit voltage of photovoltaic substrate group string, may cause photovoltaic DC-to-AC converter to damage.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of over-pressure safety device and photovoltaic generating system, to solve the technical problem that causes its damage in prior art in the situation that photovoltaic DC-to-AC converter is inputted overvoltage.
First aspect, a kind of over-pressure safety device that the embodiment of the present invention provides, described over-pressure safety device is connected between photovoltaic substrate group string and photovoltaic DC-to-AC converter, and described over-pressure safety device comprises: the first control unit and protected location, wherein,
Described the first control unit is connected with described protected location, in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter, controls described protected location and opens, and described photovoltaic DC-to-AC converter is protected.
Further; described over-pressure safety device also comprises the first alarm unit; described the first alarm unit is connected with described the first control unit; wherein; described the first control unit, also in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter, is controlled described the first alarm unit and is reported to the police.
Further; described over-pressure safety device also comprises the second control unit; described the second control unit is connected with described the first control unit; wherein; described the first control unit is also in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter; control described the second control unit and generate alarm signal, so that described photovoltaic DC-to-AC converter is reported to the police under the control of described alarm signal.
Further, described the first control unit comprises: the first diode, the second diode and the first capacitor, and wherein, described the first diode and the second diode are transient voltage suppressor diode or voltage stabilizing didoe;
The negative electrode of described the first diode is connected with the positive pole of described photovoltaic substrate group string and the positive pole of described photovoltaic DC-to-AC converter; the anode of described the first diode is connected with the positive plate of the negative electrode of described the second diode, described the first capacitor, described protected location, and the negative plate of the anode of described the second diode and described the first capacitor is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
Further, described protected location comprises: the first resistance, the second resistance and NMOS pipe;
The anodic bonding of the first diode of one end of described the first resistance and described the first control unit, the other end of described the first resistance is connected with one end of described the second resistance and the grid of a described NMOS pipe, the drain electrode of a described NMOS pipe is connected with the positive pole of described photovoltaic substrate group string and the positive pole of described photovoltaic DC-to-AC converter, and the other end of the source electrode of a described NMOS pipe and described the second resistance is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
Further, the rated voltage of described the first diode equals the maximum input voltage of described photovoltaic DC-to-AC converter;
The rated voltage of described the second diode is greater than the cut-in voltage of a described NMOS pipe.
Further, described the first alarm unit comprises: the 3rd resistance and buzzer;
The anodic bonding of the first diode of one end of described the 3rd resistance and described the first control unit, the other end of described the 3rd resistance be connected with anode described buzzer, the negative terminal of described buzzer is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
Further, described the second control unit comprises: the 4th resistance and photoelectrical coupler, and wherein, described photoelectrical coupler comprises the first light-emitting diode and the first phototriode;
The anodic bonding of the first diode of described the 4th resistance one end and described the first control unit, the anodic bonding of the first light-emitting diode of the other end of described the 4th resistance and described photoelectrical coupler, the negative electrode of described the first light-emitting diode is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter, the collector electrode of the first phototriode of described photoelectrical coupler is connected with the digital signal processor in described photovoltaic DC-to-AC converter, the grounded emitter of described the first phototriode.
Second aspect; the embodiment of the present invention also provides a kind of photovoltaic generating system; comprise the over-pressure safety device of photovoltaic substrate group string, photovoltaic DC-to-AC converter and above-mentioned first aspect; described over-pressure safety device is connected between described photovoltaic substrate group string and described photovoltaic DC-to-AC converter, for described photovoltaic DC-to-AC converter being protected in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter.
The over-pressure safety device that the embodiment of the present invention provides and photovoltaic generating system, by the first control unit and protected location in this over-pressure safety device, the input voltage of photovoltaic DC-to-AC converter is controlled within the scope of the maximum input voltage of photovoltaic DC-to-AC converter, can avoid causing photovoltaic DC-to-AC converter to damage in the time that the open circuit voltage of photovoltaic substrate group string is greater than the maximum input voltage of photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter be played to the effect of input overvoltage protection; In addition; by the first alarm unit in this over-pressure safety device and the second control unit; in the time that being greater than the maximum input voltage of photovoltaic DC-to-AC converter, can also send the open circuit voltage of photovoltaic substrate group string alarm disconnects photovoltaic DC-to-AC converter as early as possible input line for reminding user; and reduce the number of photovoltaic substrate group string, to reduce the open circuit voltage of photovoltaic substrate group string.
Accompanying drawing explanation
By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is a kind of structural representation that photovoltaic DC-to-AC converter is adopted to over-pressure safety device that the embodiment of the present invention provides;
Fig. 2 is the another kind that provides of the embodiment of the present invention adopts over-pressure safety device structural representation to photovoltaic DC-to-AC converter;
Fig. 3 is a kind of circuit diagram that photovoltaic DC-to-AC converter is adopted to over-pressure safety device that the embodiment of the present invention provides;
Fig. 4 is the structural representation of a kind of photovoltaic generating system of providing of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not full content.
The embodiment of the present invention provides a kind of over-pressure safety device.Fig. 1 is a kind of structural representation that photovoltaic DC-to-AC converter is adopted to over-pressure safety device that the embodiment of the present invention provides.As shown in Figure 1; over-pressure safety device 13 is connected between photovoltaic substrate group string 11 and photovoltaic DC-to-AC converter 12; described over-pressure safety device 13 comprises: the first control unit 131 and protected location 132; wherein; described the first control unit 131 is connected with described protected location 132; for in the time that the open circuit voltage of described photovoltaic substrate group string 11 is greater than the maximum input voltage of described photovoltaic DC-to-AC converter 12, control described protected location 132 and open, described photovoltaic DC-to-AC converter 12 is protected.
It should be noted that, in the time that the open circuit voltage of photovoltaic substrate group string 11 is within the scope of the maximum input voltage of photovoltaic DC-to-AC converter 12, over-pressure safety device 13 is not worked, the first control unit 131 and protected location 132 are not worked, now, the input voltage of photovoltaic DC-to-AC converter 12 is the open circuit voltage of photovoltaic substrate group string 11, belongs to safe voltage; In the time that the open circuit voltage of photovoltaic substrate group string 11 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 12; if this open circuit voltage is input to photovoltaic DC-to-AC converter 12; may cause photovoltaic DC-to-AC converter 12 to damage; now; over-pressure safety device 13 is devoted oneself to work; and the first control unit 131 is opened protected location 132; so that the open circuit voltage of photovoltaic substrate group string 11 can not be input to photovoltaic DC-to-AC converter 12; avoid photovoltaic DC-to-AC converter 12 to occur damaging the in the situation that of input overvoltage, and photovoltaic DC-to-AC converter 12 has been played to the effect of input overvoltage protection.
Fig. 2 is the another kind that provides of the embodiment of the present invention adopts over-pressure safety device structural representation to photovoltaic DC-to-AC converter.Alternatively; referring to Fig. 2; over-pressure safety device 13 also comprises the first alarm unit 133; described the first alarm unit 133 is connected with described the first control unit 131; wherein; described the first control unit 131, also in the time that the open circuit voltage of described photovoltaic substrate group string 11 is greater than the maximum input voltage of described photovoltaic DC-to-AC converter 12, is controlled described the first alarm unit 133 and is reported to the police.
It should be noted that, in the time that the open circuit voltage of photovoltaic substrate group string 11 is within the scope of the maximum input voltage of photovoltaic DC-to-AC converter 12, over-pressure safety device 13 is not worked, and now the first control unit 131 and the first alarm unit 133 are not worked; In the time that the open circuit voltage of photovoltaic substrate group string 11 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 12; over-pressure safety device 13 is worked; now the first control unit 131 is opened the first alarm unit 133; and report to the police; the mode of reporting to the police can adopt acoustical signal, also can adopt light signal, disconnects as early as possible the input line of photovoltaic DC-to-AC converter 12 with reminding user; and reduce the number of photovoltaic substrate group string 11, to reduce the open circuit voltage of photovoltaic substrate group string 11.
Alternatively; referring to Fig. 2; described over-pressure safety device 13 also comprises the second control unit 134; described the second control unit 134 is connected with described the first control unit 131; wherein; described the first control unit 131, also in the time that the open circuit voltage of described photovoltaic substrate group string 11 is greater than the maximum input voltage of described photovoltaic DC-to-AC converter 12, is controlled described the second control unit 134 and is generated alarm signal, so that described photovoltaic DC-to-AC converter 12 is reported to the police under the control of described alarm signal.
It should be noted that, above-mentioned, in the time that the open circuit voltage of photovoltaic substrate group string 11 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 12, except being undertaken alarm by the first alarm unit 133, also can reporting to the police by photovoltaic DC-to-AC converter 12.Can be low level signal for controlling the alarm signal that photovoltaic DC-to-AC converter 12 reports to the police, can be also high level signal, determine according to concrete design.By the warning of photovoltaic DC-to-AC converter 12, can disconnect as early as possible the input line of photovoltaic DC-to-AC converter 12 by reminding user, and reduce the number of photovoltaic substrate group string 11, to reduce the open circuit voltage of photovoltaic substrate group string 11.
Fig. 3 is a kind of circuit diagram that photovoltaic DC-to-AC converter is adopted to over-pressure safety device that the embodiment of the present invention provides.Alternatively, referring to Fig. 3, the first control unit 131 of over-pressure safety device 13 comprises: the first diode D1, the second diode D2 and the first capacitor C1, and wherein, described the first diode D1 and the second diode D2 are transient voltage suppressor diode or voltage stabilizing didoe; The negative electrode of described the first diode D1 is connected with the positive pole of described photovoltaic substrate group string 11 and the positive pole of described photovoltaic DC-to-AC converter 12; the anode of described the first diode D1 is connected with positive plate, the described protected location 132 of the negative electrode of described the second diode D2, described the first capacitor C1, and the negative plate of the anode of described the second diode D2 and described the first capacitor C1 is connected with the negative pole of described photovoltaic substrate group string 11 and the negative pole of described photovoltaic DC-to-AC converter 12.
Described transient voltage suppressor diode (Transient Voltage Suppressor; be called for short TVS) be a kind of over-voltage protector with bi-directional voltage stabilizing characteristic and two-way negative resistance charactertistic; it is applied in various interchanges and DC power supply circuit; be used for suppressing transient overvoltage, thereby protective circuit is not damaged by transient overvoltage.
Alternatively, the rated voltage of described the first diode D1 equals the maximum input voltage of described photovoltaic DC-to-AC converter 12.In the time of the circuit of actual design the first control unit 131, the rated voltage that can choose the first diode D1 equals the maximum input voltage of photovoltaic DC-to-AC converter 12, and the rated voltage that also can choose the first diode D1 is slightly larger than the maximum input voltage of photovoltaic DC-to-AC converter 12.
The first not conducting of diode D1 in the time that the open circuit voltage of photovoltaic substrate group string 11 is within the scope of the maximum input voltage of photovoltaic DC-to-AC converter 12, the first control unit 131 is not worked, circuit is not affected, and in the time that the open circuit voltage of photovoltaic substrate group string 11 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 12, the first diode D1 conducting, the first control unit 131 is worked, will have voltage at the two ends of the first capacitor C1.For convenience, the voltage of establishing the first capacitor C1 two ends is Vs.Voltage Vs can make protected location 132, the first alarm unit 133 and the second control unit 134 open.In addition, the second diode D2 is used for the voltage at clamper the first capacitor C1 two ends, makes it be no more than the rated voltage of the second diode D2.
Alternatively, referring to Fig. 3, the protected location 132 of over-pressure safety device 13 comprises: the first resistance R 1, the second resistance R 2 and NMOS pipe Q1; The anodic bonding of the first diode D1 of one end of described the first resistance R 1 and described the first control unit 131, the other end of described the first resistance R 1 is connected with one end of described the second resistance R 2 and the grid of a described NMOS pipe Q1, the drain electrode of a described NMOS pipe Q1 is connected with the positive pole of described photovoltaic substrate group string 11 and the positive pole of described photovoltaic DC-to-AC converter 12, and a described NMOS pipe source electrode of Q1 and the other end of described the second resistance R 2 are connected with the negative pole of described photovoltaic substrate group string 11 and the negative pole of described photovoltaic DC-to-AC converter 12.
In the time that the open circuit voltage of photovoltaic substrate group string 11 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 12; the first diode D1 conducting; there is voltage Vs at the two ends of the first capacitor C1; voltage Vs can make a NMOS pipe Q1 conducting, and protected location 132 is opened, by 11 short circuits of photovoltaic substrate group string; according to the feature of photovoltaic substrate group string 11; the open circuit voltage of photovoltaic substrate group string 11 can decline rapidly, and in the time that open circuit voltage drops to below the maximum input voltage of photovoltaic DC-to-AC converter 12, the first diode D1 can end.When after the first diode D1 cut-off, voltage Vs on the first capacitor C1 can discharge by the loop of the formations such as the first resistance R 1 and the second resistance R 2, the one NMOS pipe Q1 is closed, the open circuit voltage of photovoltaic substrate group string 11 rises again and exceedes the maximum input voltage of photovoltaic DC-to-AC converter 12, makes again the first diode D1 conducting.The first control unit 131 is just operated in this continuous conducting and the state of closing and makes the input voltage clamper of photovoltaic DC-to-AC converter 12 near its maximum input voltage, to protect photovoltaic DC-to-AC converter 12 not damaged.
Alternatively, the rated voltage of described the second diode D2 is greater than the cut-in voltage of a described NMOS pipe Q1.In the time of actual design the first control unit 131 and protected location 132, the rated voltage that can choose the second diode D2 is greater than the cut-in voltage of a NMOS pipe Q1, for example, can choose rated voltage and be the second diode D2 of 12 volts.As mentioned above; the second diode D2 is used for the voltage Vs at clamper the first capacitor C1 two ends; make it be no more than the rated voltage of the second diode D2; and voltage Vs can control the unlatching of a NMOS pipe Q1; if the rated voltage of the second diode D2 is greater than the cut-in voltage of a NMOS pipe Q1; voltage Vs can control the unlatching of a NMOS pipe Q1 well; in the time that the open circuit voltage of photovoltaic substrate group string 11 is excessive, the second diode D2 can also play a protective role to protected location 132, the first alarm unit 133 and the second control unit 134 simultaneously.
Alternatively, referring to Fig. 3, the first alarm unit 133 of over-pressure safety device 13 comprises: the 3rd resistance R 3 and buzzer B1; The anodic bonding of the first diode D1 of one end of described the 3rd resistance R 3 and described the first control unit 131, the anode with described buzzer B1 of the other end of described the 3rd resistance R 3 is connected, and the negative terminal of described buzzer B1 is connected with the negative pole of described photovoltaic substrate group string 11 and the negative pole of described photovoltaic DC-to-AC converter 12.
In the time that the open circuit voltage of photovoltaic substrate group string 11 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 12, the first control unit 131 is devoted oneself to work, the voltage Vs at the first capacitor C1 two ends of the first control unit 131 makes the buzzer B1 of the first alarm unit 133 warning of sounding a buzzer, reminding user disconnects the input line of photovoltaic DC-to-AC converter 12 as early as possible, and reduce the number of photovoltaic substrate group string 11, to reduce the open circuit voltage of photovoltaic substrate group string 11.
Alternatively, referring to Fig. 3, the second control unit 134 of over-pressure safety device 13 comprises: the 4th resistance R 4 and photoelectrical coupler U1, and wherein, described photoelectrical coupler U1 comprises the first light-emitting diode D3 and the first phototriode Q2; The anodic bonding of the first diode D1 of described the 4th resistance R 4 one end and described the first control unit 131, the anodic bonding of the first light-emitting diode D3 of the other end of described the 4th resistance R 4 and described photoelectrical coupler U1, the negative electrode of described the first light-emitting diode D3 is connected with the negative pole of described photovoltaic substrate group string 11 and the negative pole of described photovoltaic DC-to-AC converter 12, the collector electrode of the first phototriode Q2 of described photoelectrical coupler U1 is connected with the digital signal processor 121 in described photovoltaic DC-to-AC converter 12, the grounded emitter of described the first phototriode Q2.
In the time that the open circuit voltage of photovoltaic substrate group string 11 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 12, the first control unit 131 is devoted oneself to work, the voltage Vs at the first capacitor C1 two ends of the first control unit 131 makes photoelectrical coupler U1 conducting by the 4th resistance R 4, due to the grounded emitter of the first phototriode Q2 of photoelectrical coupler U1, can give like this digital signal processor 121(Digital Signal Processor in the photovoltaic DC-to-AC converter 12 being connected with the collector electrode of the first phototriode Q2, be called for short DSP) low level signal, digital signal processor 121 is understood display alarm information on the display floater of photovoltaic DC-to-AC converter 11 after receiving this signal, with the form reminding user of Word message, for example please disconnect as early as possible the input line of photovoltaic DC-to-AC converter, check whether the open circuit voltage of photovoltaic substrate group string exceedes the maximum input voltage of photovoltaic DC-to-AC converter, and provide the maximum input voltage of photovoltaic DC-to-AC converter, simultaneously all right display reminding information, for example the open circuit voltage of photovoltaic substrate group string can not exceed the maximum input voltage of photovoltaic DC-to-AC converter, otherwise, the photovoltaic DC-to-AC converter causing thus damages and does not belong to warranty coverage.
The embodiment of the present invention also provides a kind of photovoltaic generating system.Fig. 4 is the structural representation of a kind of photovoltaic generating system of providing of the embodiment of the present invention.Referring to Fig. 4; photovoltaic generating system comprises photovoltaic substrate group string 21, photovoltaic DC-to-AC converter 22 and over-pressure safety device 23; and over-pressure safety device 23 is connected between photovoltaic substrate group string 21 and photovoltaic DC-to-AC converter 22, for photovoltaic DC-to-AC converter 22 being protected in the time that the open circuit voltage of photovoltaic substrate group string 21 is greater than the maximum input voltage of photovoltaic DC-to-AC converter 22.Wherein, over-pressure safety device 23 adopts above-mentioned over-pressure safety device.This over-pressure safety device is protected photovoltaic DC-to-AC converter in the situation that of input overvoltage, thereby has also realized photovoltaic generating system is protected.
The over-pressure safety device that the embodiment of the present invention provides and photovoltaic generating system, by the first control unit and protected location in this over-pressure safety device, the input voltage of photovoltaic DC-to-AC converter is controlled within the scope of the maximum input voltage of photovoltaic DC-to-AC converter, can avoid causing photovoltaic DC-to-AC converter to damage in the time that the open circuit voltage of photovoltaic substrate group string is greater than the maximum input voltage of photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter be played to the effect of input overvoltage protection; In addition; by the first alarm unit in this over-pressure safety device and the second control unit; in the time that being greater than the maximum input voltage of photovoltaic DC-to-AC converter, can also send the open circuit voltage of photovoltaic substrate group string alarm disconnects photovoltaic DC-to-AC converter as early as possible input line for reminding user; and reduce the number of photovoltaic substrate group string, to reduce the open circuit voltage of photovoltaic substrate group string.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (9)
1. an over-pressure safety device, described over-pressure safety device is connected between photovoltaic substrate group string and photovoltaic DC-to-AC converter, it is characterized in that, and described over-pressure safety device comprises: the first control unit and protected location, wherein,
Described the first control unit is connected with described protected location, in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter, controls described protected location and opens, and described photovoltaic DC-to-AC converter is protected.
2. over-pressure safety device according to claim 1; it is characterized in that; described over-pressure safety device also comprises the first alarm unit; described the first alarm unit is connected with described the first control unit; wherein; described the first control unit, also in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter, is controlled described the first alarm unit and is reported to the police.
3. according to the over-pressure safety device described in any one in claim 1-2; it is characterized in that; described over-pressure safety device also comprises the second control unit; described the second control unit is connected with described the first control unit; wherein; described the first control unit is also in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter; control described the second control unit and generate alarm signal, so that described photovoltaic DC-to-AC converter is reported to the police under the control of described alarm signal.
4. over-pressure safety device according to claim 3, it is characterized in that, described the first control unit comprises: the first diode, the second diode and the first capacitor, and wherein, described the first diode and the second diode are transient voltage suppressor diode or voltage stabilizing didoe;
The negative electrode of described the first diode is connected with the positive pole of described photovoltaic substrate group string and the positive pole of described photovoltaic DC-to-AC converter; the anode of described the first diode is connected with the positive plate of the negative electrode of described the second diode, described the first capacitor, described protected location, and the negative plate of the anode of described the second diode and described the first capacitor is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
5. over-pressure safety device according to claim 4, is characterized in that, described protected location comprises: the first resistance, the second resistance and NMOS pipe;
The anodic bonding of the first diode of one end of described the first resistance and described the first control unit, the other end of described the first resistance is connected with one end of described the second resistance and the grid of a described NMOS pipe, the drain electrode of a described NMOS pipe is connected with the positive pole of described photovoltaic substrate group string and the positive pole of described photovoltaic DC-to-AC converter, and the other end of the source electrode of a described NMOS pipe and described the second resistance is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
6. over-pressure safety device according to claim 5, is characterized in that, the rated voltage of described the first diode equals the maximum input voltage of described photovoltaic DC-to-AC converter;
The rated voltage of described the second diode is greater than the cut-in voltage of a described NMOS pipe.
7. over-pressure safety device according to claim 5, is characterized in that, described the first alarm unit comprises: the 3rd resistance and buzzer;
The anodic bonding of the first diode of one end of described the 3rd resistance and described the first control unit, the other end of described the 3rd resistance be connected with anode described buzzer, the negative terminal of described buzzer is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
8. over-pressure safety device according to claim 5, is characterized in that, described the second control unit comprises: the 4th resistance and photoelectrical coupler, and wherein, described photoelectrical coupler comprises the first light-emitting diode and the first phototriode;
The anodic bonding of the first diode of described the 4th resistance one end and described the first control unit, the anodic bonding of the first light-emitting diode of the other end of described the 4th resistance and described photoelectrical coupler, the negative electrode of described the first light-emitting diode is connected with the negative pole of described photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter, the collector electrode of the first phototriode of described photoelectrical coupler is connected with the digital signal processor in described photovoltaic DC-to-AC converter, the grounded emitter of described the first phototriode.
9. a photovoltaic generating system; it is characterized in that; comprise the over-pressure safety device described in any one in photovoltaic substrate group string, photovoltaic DC-to-AC converter and the claims 1-8; described over-pressure safety device is connected between described photovoltaic substrate group string and described photovoltaic DC-to-AC converter, for described photovoltaic DC-to-AC converter being protected in the time that the open circuit voltage of described photovoltaic substrate group string is greater than the maximum input voltage of described photovoltaic DC-to-AC converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410028531.1A CN103780071B (en) | 2014-01-21 | 2014-01-21 | A kind of over-pressure safety device and photovoltaic generating system |
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| WO2015192769A1 (en) * | 2014-06-20 | 2015-12-23 | 华为技术有限公司 | Inverter and control device and method thereof, and inverter system |
| CN105827179A (en) * | 2015-01-04 | 2016-08-03 | 华为技术有限公司 | Photovoltaic system |
| WO2019061824A1 (en) * | 2017-09-27 | 2019-04-04 | 深圳光峰科技股份有限公司 | Optical coupling overvoltage protection circuit and related electrical appliance |
| CN111668868A (en) * | 2020-05-08 | 2020-09-15 | 华为技术有限公司 | Photovoltaic power generation system and method |
| WO2022041856A1 (en) * | 2020-08-31 | 2022-03-03 | 华为数字能源技术有限公司 | Series/parallel converter protection system, controller, and converter |
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| EP3142238B1 (en) | 2014-06-20 | 2019-01-23 | Huawei Technologies Co., Ltd. | Inverter and control device and method thereof, and inverter system |
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| CN111668868A (en) * | 2020-05-08 | 2020-09-15 | 华为技术有限公司 | Photovoltaic power generation system and method |
| WO2021223603A1 (en) * | 2020-05-08 | 2021-11-11 | 华为数字能源技术有限公司 | Photovoltaic power generation system and method |
| EP4138252A4 (en) * | 2020-05-08 | 2023-12-06 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic power generation system and method |
| WO2022041856A1 (en) * | 2020-08-31 | 2022-03-03 | 华为数字能源技术有限公司 | Series/parallel converter protection system, controller, and converter |
| CN114665518A (en) * | 2022-05-25 | 2022-06-24 | 深圳市中旭新能源有限公司 | Household ultra-long string photovoltaic system, power optimization device and overvoltage protection method |
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