CN103683998A - Method and device for reducing nighttime power consumption of photovoltaic inverter - Google Patents
Method and device for reducing nighttime power consumption of photovoltaic inverter Download PDFInfo
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Abstract
The invention discloses a method and device for reducing nighttime power consumption of a photovoltaic inverter. The method for reducing the nighttime power consumption of the photovoltaic inverter comprises the steps of carrying out voltage detection on an input photovoltaic voltage to obtain a photovoltaic voltage value; closing a driving circuit to control the photovoltaic inverter to be turned on or turned off when the photovoltaic voltage value increases to a daytime voltage limit; opening the driving circuit to reduce the nighttime power consumption when the photovoltaic voltage value decreases to a nighttime voltage limit, wherein the nighttime voltage limit is larger than the daytime voltage limit. According to the method and device for reducing the nighttime power consumption of the photovoltaic inverter, voltage detection can be carried out on the input photovoltaic voltage, and whether it is in the day or at night is judged according to the obtained photovoltaic voltage value; when it is at night, the photovoltaic voltage value decreases, the driving circuit of the photovoltaic inverter is opened to reduce nighttime power consumption of the driving circuit when the photovoltaic voltage value decreases to the nighttime voltage limit, and thus the nighttime power consumption of the photovoltaic inverter can be reduced. The method for reducing the nighttime power consumption of the photovoltaic inverter is low in cost, simple and reliable, the nighttime power consumption of the photovoltaic inverter can be remarkably reduced, energy consumption of a user can be reduced, and competitiveness is enhanced.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter field, relate in particular to a kind of method and apparatus that reduces photovoltaic DC-to-AC converter power consumption at night.
Background technology
Conventionally the process that direct current energy is transformed into AC energy is called to inversion, the circuit that completes invert function is called to inverter circuit, the device of realizing inversion process is called to contravariant equipment or inverter.Photovoltaic (Photovoltaic, PV) inverter refers to the equipment that direct current is transformed to alternating current in photovoltaic generating system.The technical parameter of typical inverter is as shown in table 1:
The typical inverter technology parameter of table 1
When the power consumption at night in table 1 refers to that inverter is not worked night, existing a part of quiescent dissipation itself.In photovoltaic DC-to-AC converter field, the power consumption at night of photovoltaic DC-to-AC converter is a problem meriting attention.Night, photovoltaic DC-to-AC converter did not have input voltage substantially, does not generate electricity without sunlight, but can slave station electricity consumption obtain control electricity consumption, thereby produce a part of quiescent dissipation, this part quiescent dissipation is not from several watts to tens watts etc., directly slave station electricity consumption consumes, and to user, is a kind of loss.Therefore, need to reduce as much as possible the loss of this part.Fig. 1 is the power supply plan of common PV inverter.The PV electricity that PV cell panel is produced exports photovoltaic inverter circuit to, to carry out alternating current conversion.Wherein photovoltaic inverter circuit comprises control circuit, drive circuit and power circuit.Above-mentioned control circuit, drive circuit and power circuit are all powered by accessory power supply, and accessory power supply can be from the station electricity consumption of PV electricity, self power generation or AC network.In addition, operating state and the parameter setting of monitoring display PV inverter each several part in real time.According to Fig. 1, can find out, the power consumption at night of prior art mainly comes from loss, insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) drive circuit of module and a small amount of control circuit loss of accessory power supply self.The method of at present conventional reduction power consumption at night is mainly also to realize by reducing the oneself power consumption of PV inverter each part mentioned above generation.
According to above description, can find out, the scheme that reduces power consumption at night in prior art mainly realizes by reducing the quiescent dissipation of PV inverter each several part self, and the power consumption at night that this technical scheme can reduce is limited, and effect is remarkable not.
Summary of the invention
The invention provides a kind of method and apparatus that reduces photovoltaic DC-to-AC converter power consumption at night, with solve in prior art, cannot significantly reduce PV inverter night power consumption technical problem.
For solving the problems of the technologies described above, the invention provides a kind of method that reduces photovoltaic DC-to-AC converter power consumption at night, comprising:
Photovoltaic electric to input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage;
When rising to voltage in the daytime, described photovoltaic magnitude of voltage, opens drive circuit, to control unlatching or the shutoff of photovoltaic DC-to-AC converter in limited time;
When described photovoltaic magnitude of voltage drop to night voltage in limited time, close drive circuit, to reduce power consumption at night, described night voltage limit be greater than described in voltage limit in the daytime.
Further, described voltage is in the daytime limited to: 25V-75V.
Further, voltage was limited to: 75V-125V described night.
Further, described unlatching drive circuit, comprises to control unlatching or the shutoff of photovoltaic DC-to-AC converter:
When described drive circuit is opened, in given contravarianter voltage limit, open or close photovoltaic DC-to-AC converter, described contravarianter voltage limit is greater than voltage limit at described night.
Further, described contravarianter voltage is limited to: 450V-500V.
On the other hand, the present invention also provides a kind of device that reduces photovoltaic DC-to-AC converter power consumption at night, comprising: photovoltaic voltage detection unit, stagnant ring control unit, drive circuit enable control unit and drive circuit;
Described photovoltaic voltage detection unit, for the photovoltaic electric of input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage, and result is sent to described stagnant ring control unit;
The photovoltaic magnitude of voltage that described stagnant ring control unit detects for receiving described photovoltaic voltage detection unit, described drive circuit is enabled to control unit and carry out stagnant ring control: when described photovoltaic magnitude of voltage rises to voltage in the daytime, in limited time, make described drive circuit enable control unit and open described drive circuit; When described photovoltaic magnitude of voltage drop to night voltage in limited time, make described drive circuit enable control unit and close described drive circuit, to reduce power consumption at night, described night voltage limit be greater than described in voltage limit in the daytime;
Described drive circuit enables control unit for receiving the instruction of described stagnant ring control unit, opens or close described drive circuit;
Described drive circuit, for controlling unlatching or the shutoff of photovoltaic DC-to-AC converter.
Further, described voltage is in the daytime limited to: 25V-75V.
Further, voltage was limited to: 75V-125V described night.
Further, described drive circuit comprises:
Photovoltaic DC-to-AC converter control unit, opens or closes photovoltaic DC-to-AC converter for the contravarianter voltage limit given, and described contravarianter voltage limit is greater than voltage limit at described night.
Further, described contravarianter voltage is limited to: 450V-500V.
Further, described drive circuit enables control unit and comprises: NPN triode, or PNP triode, for receiving the instruction of described stagnant ring control unit, open or close drive circuit.
Further, described drive circuit enables control unit and comprises: NPN triode and PWM2808 chip, and the base stage of described NPN triode connects described stagnant ring control unit, grounded emitter, collector electrode connects the COMP end of described PWM2808 chip.
Further, described drive circuit enables control unit and comprises: NPN triode and PWM3808 chip, and the base stage of described NPN triode connects described stagnant ring control unit, grounded emitter, collector electrode connects the COMP end of described PWM3808 chip.
Further, described device also comprises:
The anti-tampering unit of filter ring, is connected to described stagnant ring control unit and described drive circuit and enables between control unit, for the output signal of described stagnant ring control unit is carried out to filtering, prevents external interference.
In the embodiment of the present invention, by the photovoltaic electric of input is compressed into row voltage detecting, according to the photovoltaic magnitude of voltage judgement obtaining, it is daytime or night.While entering night, photovoltaic electric drops, photovoltaic DC-to-AC converter is not worked, and the now quiescent dissipation of drive circuit is the main power consumption at night of photovoltaic DC-to-AC converter.So the present invention closes the drive circuit of photovoltaic DC-to-AC converter in limited time dropping to night voltage, to reduce the power consumption at night of drive circuit, thereby reduce the power consumption at night of photovoltaic DC-to-AC converter.Daytime, photovoltaic voltage rose gradually, when rising to voltage in the daytime, opened drive circuit, the unlikely normal work that affects photovoltaic DC-to-AC converter in limited time.Because the limit of voltage is in the daytime not equal to voltage limit at night, can prevent that open and close behavior is chaotic, avoids misoperation.The invention provides a kind of method of low cost, simple and reliable remarkable reduction photovoltaic DC-to-AC converter power consumption at night, for user saves energy consumption, enhance competitiveness.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the power supply plan of photovoltaic DC-to-AC converter common in prior art;
Fig. 2 is the basic procedure schematic diagram that the embodiment of the present invention 1 reduces the method for photovoltaic DC-to-AC converter power consumption at night;
Fig. 3 is the basic structure schematic diagram that the embodiment of the present invention 2 reduces the device of photovoltaic DC-to-AC converter power consumption at night;
Fig. 4 is the structural representation that the embodiment of the present invention 2 reduces the device of photovoltaic DC-to-AC converter power consumption at night;
Fig. 5 is the structural representation that the embodiment of the present invention 3 reduces the device of photovoltaic DC-to-AC converter power consumption at night;
Fig. 6 is the schematic flow sheet that the embodiment of the present invention 3 reduces the method for photovoltaic DC-to-AC converter power consumption at night;
Fig. 7 is the technical scheme schematic diagram that the embodiment of the present invention 3 reduces the device of photovoltaic DC-to-AC converter power consumption at night;
Fig. 8 is the structural representation that the embodiment of the present invention 4 reduces the device of photovoltaic DC-to-AC converter power consumption at night;
Fig. 9 is the schematic flow sheet that the embodiment of the present invention 4 reduces the method for photovoltaic DC-to-AC converter power consumption at night.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
Embodiment 1:
First the embodiment of the present invention 1 provides a kind of method that reduces photovoltaic DC-to-AC converter power consumption at night, referring to Fig. 2, comprising:
Step 201: the photovoltaic electric to input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage.
Step 202:, open drive circuit, to control unlatching or the shutoff of photovoltaic DC-to-AC converter in limited time when described photovoltaic magnitude of voltage rises to voltage in the daytime.
Step 203: when described photovoltaic magnitude of voltage drop to night voltage in limited time, close drive circuit, to reduce power consumption at night, described night voltage limit be greater than described in voltage limit in the daytime.
Visible, in the method for the reduction photovoltaic DC-to-AC converter power consumption at night proposing in the embodiment of the present invention, can compress into row voltage detecting to the photovoltaic electric of input, according to the photovoltaic magnitude of voltage judgement obtaining, be daytime or night.While entering night, photovoltaic electric drops, photovoltaic DC-to-AC converter is not worked, and the now quiescent dissipation of drive circuit is the main power consumption at night of photovoltaic DC-to-AC converter.So the embodiment of the present invention is closed the drive circuit of photovoltaic DC-to-AC converter in limited time dropping to night voltage, to reduce the power consumption at night of drive circuit, thereby reduce the power consumption at night of photovoltaic DC-to-AC converter.Daytime, photovoltaic voltage rose gradually, when rising to voltage in the daytime, opened drive circuit, the unlikely normal work that affects photovoltaic DC-to-AC converter in limited time.Because the limit of voltage is in the daytime not equal to voltage limit at night, can prevent that open and close behavior is chaotic, avoids misoperation.The embodiment of the present invention provides a kind of method of low cost, simple and reliable remarkable reduction photovoltaic DC-to-AC converter power consumption at night, for user saves energy consumption, enhances competitiveness.
Preferably, the span of voltage limit can be in the daytime: 25V-75V.
Preferably, the span that night, voltage was limit can be: 75V-125V.
Preferably, when drive circuit is opened, can open or close photovoltaic DC-to-AC converter in the contravarianter voltage limit of photovoltaic DC-to-AC converter.Concrete: when photovoltaic electric presses, be raised to contravarianter voltage in limited time, by drive circuit, drive photovoltaic DC-to-AC converter to start shooting, photovoltaic DC-to-AC converter is normally worked; When photovoltaic electric, depress and drop to contravarianter voltage in limited time, by drive circuit, drive photovoltaic DC-to-AC converter to shut down, photovoltaic DC-to-AC converter quits work.Contravarianter voltage limit can be greater than voltage limit at night herein, certainly, is also greater than voltage limit in the daytime simultaneously.
Preferably, the span of contravarianter voltage limit can be: 450V-500V.
Embodiment 2:
The invention process 2 provides a kind of device that reduces photovoltaic DC-to-AC converter power consumption at night, referring to Fig. 3, comprising:
Photovoltaic voltage detection unit 301, for the photovoltaic electric of input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage, and result is sent to stagnant ring control unit 302;
Stagnant ring control unit 302, the photovoltaic magnitude of voltage detecting for receiving photovoltaic voltage detection unit 301, drive circuit is enabled to control unit 303 and carry out stagnant ring control: when photovoltaic magnitude of voltage rises to voltage in the daytime, in limited time, make drive circuit enable control unit 303 and open drive circuit 304; When photovoltaic magnitude of voltage drop to night voltage in limited time, make drive circuit enable control unit 303 and close drive circuit 304, to reduce power consumption at night, night, voltage limit was greater than voltage limit in the daytime;
Drive circuit enables control unit 303, for receiving the instruction of stagnant ring control unit 302, opens or close drive circuit 304;
Preferably, the span of voltage limit can be in the daytime: 25V-75V.
Preferably, the span that night, voltage was limit can be: 75V-125V.
Preferably, drive circuit 304 can comprise: photovoltaic DC-to-AC converter control unit 401, see Fig. 4, for the contravarianter voltage limit given, open or close photovoltaic DC-to-AC converter, concrete: when pressing, photovoltaic electric is raised to contravarianter voltage in limited time, by photovoltaic DC-to-AC converter control unit 401, drive photovoltaic DC-to-AC converter to start shooting, photovoltaic DC-to-AC converter is normally worked; When photovoltaic electric, depress and drop to contravarianter voltage in limited time, by photovoltaic DC-to-AC converter control unit 401, drive photovoltaic DC-to-AC converter to shut down, photovoltaic DC-to-AC converter quits work.Contravarianter voltage limit can be greater than voltage limit at night herein, certainly, is also greater than voltage limit in the daytime simultaneously.
Preferably, the span of contravarianter voltage limit can be: 450V-500V.
Drive circuit enables instruction that control unit 303 need to receive stagnant ring control unit 302 and controls and open or cut out drive circuit 304.Preferably, drive circuit enables control unit 303 and can be: NPN triode or PNP triode, and as switch, control the unlatching of drive circuit 304 or close.In another embodiment of the present invention, preferably, the mode that can also adopt NPN triode or PNP triode to combine with respective chip, for example: it can be NPN triode and PWM2808 chip that drive circuit enables control unit 303, wherein the base stage of NPN triode connects stagnant ring control unit 302, grounded emitter, collector electrode connects the COMP end of PWM2808 chip; Or NPN triode and PWM3808 chip, wherein the base stage of NPN triode connects stagnant ring control unit 302, grounded emitter, and collector electrode connects the COMP end of PWM3808 chip.
Preferably, device can also comprise: the anti-tampering unit 402 of filter ring, is connected to stagnant ring control unit 302 and drive circuit and enables, between control unit 303, for the output signal of stagnant ring control unit 302 is carried out to filtering, to prevent external interference.
Embodiment 3:
The apparatus structure of the present embodiment 3 reduction photovoltaic DC-to-AC converter power consumptions at night as shown in Figure 5.Wherein, drive circuit enables control unit 303 and has comprised that a NPN triode HeTI company pwm chip 2808 is as switch, and the base stage of NPN triode connects stagnant ring control unit 302, grounded emitter, and collector electrode connects the COMP end of PWM2808 chip.Utilize operating procedure that device in the present embodiment 3 reduces photovoltaic DC-to-AC converter power consumption at night as Fig. 6:
Step 601: the photovoltaic electric to input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage.
In this step, adopt the PV voltage of 301 pairs of inputs of photovoltaic voltage detection unit to detect, by PV voltage, judge that external environment is daytime or night, then enters the circulation of step 602-step 605.
Step 602: when photovoltaic magnitude of voltage rises to 50V, open drive circuit 304.
In this step, need to carry out the stagnant ring that drive circuit enables control unit 303 by stagnant ring control unit 302 and control, in the embodiment of the present invention, adopt software hysteresis to control above-mentioned steps.When detected PV magnitude of voltage is in ascent stage, and while rising in the daytime voltage limit 50V, embodiment of the present invention device judgement external environment is daytime, thereby open drive circuit 304, controls photovoltaic DC-to-AC converter and normally works by day.
Known according to Fig. 5, because the base stage of NPN triode connects stagnant ring control unit 302, grounded emitter, collector electrode connects the COMP end of PWM2808 chip, therefore when stagnant ring control unit 302 is output as low level by software, the COMP end of PWM2808 chip can be drawn high output, thereby opens drive circuit 304.
Step 603: when photovoltaic magnitude of voltage rises to 500V, make drive circuit 304 open photovoltaic DC-to-AC converter.
In the embodiment of the present invention, the contravarianter voltage of photovoltaic DC-to-AC converter is limited to 500V, so, can make the photovoltaic DC-to-AC converter control unit 401 in drive circuit 304 open photovoltaic DC-to-AC converter when PV magnitude of voltage reaches 500V, make it carry out normal operation on daytime.
Step 604: when photovoltaic magnitude of voltage drops to 500V, make drive circuit 304 close photovoltaic DC-to-AC converter.
In this step, when daytime, transition was night gradually, PV magnitude of voltage will decline gradually.When PV magnitude of voltage drops to the contravarianter voltage limit 500V of the embodiment of the present invention when following, can make the photovoltaic DC-to-AC converter control unit 401 in drive circuit 304 close photovoltaic DC-to-AC converter.
Step 605: when photovoltaic magnitude of voltage drops to 100V, close drive circuit 304.
In this step, while entering night, PV magnitude of voltage will continue to decline, when detected PV magnitude of voltage is in the decline stage, and dropped to when night, voltage was limit 100V, external environment is judged as to night, now utilize stagnant ring control unit 302 to carry out the stagnant ring control that drive circuit enables control unit 303, close drive circuit 304 to reduce power consumption at night.
The structure that enables control unit 303 according to drive circuit in Fig. 5 is known, and when stagnant ring control unit 302 is output as high level by software, the COMP of PWM2808 chip end can drag down output, thereby closes drive circuit 304.Due to photovoltaic DC-to-AC converter night power consumption mainly from the power consumption of driving circuit section, so when drive circuit 304 thoroughly cuts out, the power consumption at night of photovoltaic DC-to-AC converter will reduce greatly, close to 0.
When finish to enter daytime at night, get back to step 602, enter next circulation.In one of them circulation, the overall process of opening and closing drive circuit 304, opening and closing photovoltaic DC-to-AC converter as shown in Figure 7: when photovoltaic magnitude of voltage rises in the daytime voltage limit 50V by day, open drive circuit 304, rise to contravarianter voltage limit 500V drive circuit in season 304 and open photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter is normally worked; Night photovoltaic magnitude of voltage drop to contravarianter voltage limit 500V drive circuit 304 in season and close photovoltaic DC-to-AC converter, continue to drop to night and close drive circuit 304 during voltage limit 100V, to reduce power consumption at night.In the embodiment of the present invention, voltage limit is less than voltage limit at night in the daytime, by software hysteresis, is controlled to realize.
So far, completed the overall process of the method for the embodiment of the present invention 3 reduction photovoltaic DC-to-AC converter power consumptions at night.
Embodiment 4:
The apparatus structure of the present embodiment 4 reduction photovoltaic DC-to-AC converter power consumptions at night as shown in Figure 8.Wherein, drive circuit enables control unit 303 and has comprised that a NPN triode HeTI company pwm chip 3808 is as switch, and the base stage of NPN triode connects stagnant ring control unit 302, grounded emitter, and collector electrode connects the COMP end of PWM3808 chip.Utilize operating procedure that device in the present embodiment 4 reduces photovoltaic DC-to-AC converter power consumption at night as Fig. 9:
Step 901: the photovoltaic electric to input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage.
In this step, adopt the PV voltage of 301 pairs of inputs of photovoltaic voltage detection unit to detect, by PV voltage, judge that external environment is daytime or night, then enters the circulation of step 902-step 905.
Step 902: when photovoltaic magnitude of voltage rises to 75V, open drive circuit 304.
In this step, need to carry out the stagnant ring that drive circuit enables control unit 303 by stagnant ring control unit 302 and control, in the embodiment of the present invention, adopt the stagnant ring of circuit to control above-mentioned steps.When detected PV magnitude of voltage is in ascent stage, and while rising in the daytime voltage limit 75V, embodiment of the present invention device judgement external environment is daytime, thereby open drive circuit 304, controls photovoltaic DC-to-AC converter and normally works by day.
Known according to Fig. 8, because the base stage of NPN triode connects stagnant ring control unit 302, grounded emitter, collector electrode connects the COMP end of PWM3808 chip, therefore when stagnant ring control unit 302 is output as low level by software, the COMP end of PWM3808 chip can be drawn high output, thereby opens drive circuit 304.
Step 903: when photovoltaic magnitude of voltage rises to 450V, make drive circuit 304 open photovoltaic DC-to-AC converter.
In the embodiment of the present invention, the contravarianter voltage of photovoltaic DC-to-AC converter is limited to 450V, so, can make the photovoltaic DC-to-AC converter control unit 401 in drive circuit 304 open photovoltaic DC-to-AC converter when PV magnitude of voltage reaches 450V, make it carry out normal operation on daytime.
Step 904: when photovoltaic magnitude of voltage drops to 450V, make drive circuit 304 close photovoltaic DC-to-AC converter.
In this step, when daytime, transition was night gradually, PV magnitude of voltage will decline gradually.When PV magnitude of voltage drops to the contravarianter voltage limit 450V of the embodiment of the present invention when following, can make the photovoltaic DC-to-AC converter control unit 401 in drive circuit 304 close photovoltaic DC-to-AC converter.
Step 905: when photovoltaic magnitude of voltage drops to 125V, close drive circuit 304.
In this step, while entering night, PV magnitude of voltage will continue to decline, when detected PV magnitude of voltage is in the decline stage, and dropped to when night, voltage was limit 125V, external environment is judged as to night, now utilize stagnant ring control unit 302 to carry out the stagnant ring control that drive circuit enables control unit 303, close drive circuit 304 to reduce power consumption at night.
The structure that enables control unit 303 according to drive circuit in Fig. 5 is known, and when stagnant ring control unit 302 is output as high level by software, the COMP of PWM3808 chip end can drag down output, thereby closes drive circuit 304.Due to photovoltaic DC-to-AC converter night power consumption mainly from the power consumption of driving circuit section, so when drive circuit 304 thoroughly cuts out, the power consumption at night of photovoltaic DC-to-AC converter will reduce greatly, close to 0.
When finish to enter daytime at night, get back to step 902, enter next circulation.
So far, completed the overall process of the method for the embodiment of the present invention 4 reduction photovoltaic DC-to-AC converter power consumptions at night.
The embodiment of the present invention can reduce the power consumption at night of photovoltaic DC-to-AC converter greatly, and the photovoltaic DC-to-AC converter of 500kW of take is example, and when utilizing the method and apparatus of the embodiment of the present invention to close after drive circuit, the power consumption at night of photovoltaic DC-to-AC converter can reduce 40W left and right.In night every day average 10 hours, 1 photovoltaic DC-to-AC converter can be economized electric weight 146 degree at 1 year internal segment, if 1 degree electricity needs cost 0.5RMB, 2000 photovoltaic DC-to-AC converters 1 year can be for user saves 14.6 ten thousand RMB, and can significantly save the energy.
Visible, the embodiment of the present invention has following beneficial effect:
In the method and apparatus of the reduction photovoltaic DC-to-AC converter power consumption at night proposing in the embodiment of the present invention, can compress into row voltage detecting to the photovoltaic electric of input, be daytime or night according to the photovoltaic magnitude of voltage judgement obtaining.While entering night, photovoltaic electric drops, photovoltaic DC-to-AC converter is not worked, and the now quiescent dissipation of drive circuit is the main power consumption at night of photovoltaic DC-to-AC converter.So the embodiment of the present invention is closed the drive circuit of photovoltaic DC-to-AC converter in limited time dropping to night voltage, to reduce the power consumption at night of drive circuit, thereby reduce the power consumption at night of photovoltaic DC-to-AC converter.Daytime, photovoltaic voltage rose gradually, when rising to voltage in the daytime, opened drive circuit, the unlikely normal work that affects photovoltaic DC-to-AC converter in limited time.Because the limit of voltage is in the daytime not equal to voltage limit at night, can prevent that open and close behavior is chaotic, avoids misoperation.The embodiment of the present invention provides a kind of method of low cost, simple and reliable remarkable reduction photovoltaic DC-to-AC converter power consumption at night, for user saves energy consumption, enhances competitiveness.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (14)
1. a method that reduces photovoltaic DC-to-AC converter power consumption at night, is characterized in that, comprising:
Photovoltaic electric to input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage;
When rising to voltage in the daytime, described photovoltaic magnitude of voltage, opens drive circuit, to control unlatching or the shutoff of photovoltaic DC-to-AC converter in limited time;
When described photovoltaic magnitude of voltage drop to night voltage in limited time, close drive circuit, to reduce power consumption at night, described night voltage limit be greater than described in voltage limit in the daytime.
2. the method for reduction photovoltaic DC-to-AC converter power consumption at night according to claim 1, is characterized in that: described voltage is in the daytime limited to: 25V-75V.
3. the method for reduction photovoltaic DC-to-AC converter power consumption at night according to claim 1, is characterized in that: described night, voltage was limited to: 75V-125V.
4. according to the method for the reduction photovoltaic DC-to-AC converter power consumption at night described in any one in claims 1 to 3, it is characterized in that described unlatching drive circuit comprises to control unlatching or the shutoff of photovoltaic DC-to-AC converter:
When described drive circuit is opened, in given contravarianter voltage limit, open or close photovoltaic DC-to-AC converter, described contravarianter voltage limit is greater than voltage limit at described night.
5. the method for reduction photovoltaic DC-to-AC converter power consumption at night according to claim 4, is characterized in that: described contravarianter voltage is limited to: 450V-500V.
6. a device that reduces photovoltaic DC-to-AC converter power consumption at night, is characterized in that, comprising: photovoltaic voltage detection unit, stagnant ring control unit, drive circuit enable control unit and drive circuit;
Described photovoltaic voltage detection unit, for the photovoltaic electric of input is compressed into row voltage detecting, obtains photovoltaic magnitude of voltage, and result is sent to described stagnant ring control unit;
The photovoltaic magnitude of voltage that described stagnant ring control unit detects for receiving described photovoltaic voltage detection unit, described drive circuit is enabled to control unit and carry out stagnant ring control: when described photovoltaic magnitude of voltage rises to voltage in the daytime, in limited time, make described drive circuit enable control unit and open described drive circuit; When described photovoltaic magnitude of voltage drop to night voltage in limited time, make described drive circuit enable control unit and close described drive circuit, to reduce power consumption at night, described night voltage limit be greater than described in voltage limit in the daytime;
Described drive circuit enables control unit for receiving the instruction of described stagnant ring control unit, opens or close described drive circuit;
Described drive circuit, for controlling unlatching or the shutoff of photovoltaic DC-to-AC converter.
7. the device of reduction photovoltaic DC-to-AC converter power consumption at night according to claim 6, is characterized in that, described voltage is in the daytime limited to: 25V-75V.
8. the device of reduction photovoltaic DC-to-AC converter power consumption at night according to claim 6, is characterized in that: described night, voltage was limited to: 75V-125V.
9. the device of reduction photovoltaic DC-to-AC converter power consumption at night according to claim 6, is characterized in that, described drive circuit comprises:
Photovoltaic DC-to-AC converter control unit, opens or closes photovoltaic DC-to-AC converter for the contravarianter voltage limit given, and described contravarianter voltage limit is greater than voltage limit at described night.
10. the device of reduction photovoltaic DC-to-AC converter power consumption at night according to claim 9, is characterized in that:
Described contravarianter voltage is limited to: 450V-500V.
11. according to the device of the reduction photovoltaic DC-to-AC converter power consumption at night described in any one in claim 6 to 10, it is characterized in that, described drive circuit enables control unit and comprises: NPN triode, or PNP triode, for receiving the instruction of described stagnant ring control unit, open or close drive circuit.
12. according to the device of the reduction photovoltaic DC-to-AC converter power consumption at night described in any one in claim 6 to 10, it is characterized in that, described drive circuit enables control unit and comprises: NPN triode and PWM2808 chip, the base stage of described NPN triode connects described stagnant ring control unit, grounded emitter, collector electrode connects the COMP end of described PWM2808 chip.
13. according to the device of the reduction photovoltaic DC-to-AC converter power consumption at night described in any one in claim 6 to 10, it is characterized in that, described drive circuit enables control unit and comprises: NPN triode and PWM3808 chip, the base stage of described NPN triode connects described stagnant ring control unit, grounded emitter, collector electrode connects the COMP end of described PWM3808 chip.
14. according to the device of the reduction photovoltaic DC-to-AC converter power consumption at night described in any one in claim 6 to 10, it is characterized in that, described device also comprises:
The anti-tampering unit of filter ring, is connected to described stagnant ring control unit and described drive circuit and enables between control unit, for the output signal of described stagnant ring control unit is carried out to filtering, prevents external interference.
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| CN107134917A (en) * | 2016-02-29 | 2017-09-05 | 中兴通讯股份有限公司 | A kind of inverter control method, device and electricity generation system |
| CN108667134A (en) * | 2017-03-29 | 2018-10-16 | 中兴通讯股份有限公司 | A kind of power supply circuit and method |
| CN112803741A (en) * | 2020-12-31 | 2021-05-14 | 航天柏克(广东)科技有限公司 | Automatic start-stop control method and circuit for photovoltaic system inverter |
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| JP2011091931A (en) * | 2009-10-22 | 2011-05-06 | Daihen Corp | Inverter controller and photovoltaic power generation system equipped with the same |
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| CN108667134A (en) * | 2017-03-29 | 2018-10-16 | 中兴通讯股份有限公司 | A kind of power supply circuit and method |
| CN112803741A (en) * | 2020-12-31 | 2021-05-14 | 航天柏克(广东)科技有限公司 | Automatic start-stop control method and circuit for photovoltaic system inverter |
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| CN103683998B (en) | 2017-01-18 |
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