CN103227560A - Method and device for starting inverter - Google Patents
Method and device for starting inverter Download PDFInfo
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- CN103227560A CN103227560A CN201310105294XA CN201310105294A CN103227560A CN 103227560 A CN103227560 A CN 103227560A CN 201310105294X A CN201310105294X A CN 201310105294XA CN 201310105294 A CN201310105294 A CN 201310105294A CN 103227560 A CN103227560 A CN 103227560A
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Abstract
The invention discloses a method and device for starting an inverter, and belongs to the field of electric power. The method comprises the following steps: loss of the inverter is increased gradually, when the inverter is in the off-grid condition; direct current bus voltage of the two ends of a direct current bus capacitor of the inverter is measured; if the direct current bus voltage is larger than the preset threshold, the load capacity of a photovoltaic module is larger than the loss of the inverter for sure and the inverter is started; and the device comprises an adding module, a measurement module and a starting module. The method and the device have the advantages that when the inverter is in the off-grid condition, the loss of the inverter is gradually increased and the direct current bus voltage is measured to determine whether the inverter is started, so that the load capacity of the photovoltaic module can be detected accurately and the service life of the inverter cannot be affected by the detection of the load capacity of the photovoltaic module; and the method is suitable for any type of inverter.
Description
Technical field
The present invention relates to power domain, particularly a kind of method and apparatus that starts inverter.
Background technology
The effect of inverter is that the direct current energy with photovoltaic module is transformed to AC energy feed-in electrical network, when invertor operation, will produce certain loss, and the load capacity that has only photovoltaic module is during greater than the loss of inverter, just starts the operation that is connected to the grid of this inverter.
Prior art provides a kind of method that starts inverter, can for: the load capacity of photovoltaic module is along with the enhancing of illumination increases, the short circuit current of photovoltaic module equally also is to increase along with the enhancing of illumination, this method detects the short circuit current at inverter two ends in real time, reach predetermined threshold value if detect short circuit current, then start this inverter.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Illumination is different because of the difference of the type of photovoltaic module to the influence of the load capacity of photovoltaic module, some photovoltaic module is when short circuit current reaches predetermined threshold value, the load capacity of himself may be less than the loss of this inverter, starts the electric energy that inverter can consume electrical network this moment; In addition, when illumination was very strong, short circuit current can be very big, and the detection of carrying out short circuit current can influence the life-span of inverter.
Summary of the invention
In order to solve prior art problems, the embodiment of the invention provides a kind of startup inverter method and device.Described technical scheme is as follows:
On the one hand, provide a kind of startup inverter method, described method comprises:
Be under net state at inverter, increase the loss of described inverter gradually;
Measure the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises;
If described DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than described inverter, and is started described inverter.
Further, describedly be under net state, increase the loss of described inverter gradually, comprising at inverter:
Open the inversion module that described inverter comprises, modulate described inversion module, make described inversion module output power-frequency voltage, to increase the loss of described inverter;
In the power-frequency voltage of described inversion module output, inject harmonic wave, to increase the loss of described inverter.
Further, describedly in the power-frequency voltage of described inversion module output, inject after the harmonic wave, also comprise:
Open the DCDC(Direct Current Direct Current that described inverter comprises, DC-DC) module, increase the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises by described DCDC module, to increase the loss of described inverter.
Further, inject harmonic wave in the power-frequency voltage of described output to described inversion module, comprising:
Obtain the harmonic wave injection rate according to the type of described inverter,, on the modulating wave of the power-frequency voltage that described inversion module is exported, increase harmonic wave according to described harmonic wave injection rate.
Further, before the described loss that increases described inverter gradually, also comprise:
Close the driving in the described inverter, make described inverter be in minimum idling consumption state.
Further, the load capacity of described definite photovoltaic module is greater than the loss of described inverter, and starts described inverter, comprising:
Obtain the time that described DC bus-bar voltage continues greater than described predetermined threshold value,, then determine of the loss of the load capacity of described photovoltaic module, and start described inverter greater than described inverter if the time of obtaining reaches Preset Time.
On the other hand, provide a kind of startup DC-to-AC converter, described device comprises:
Increase module, be used for being under net state, increase the loss of described inverter gradually at inverter;
Measurement module is used to measure the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises;
Start module,, then determine of the loss of the load capacity of photovoltaic module, and start described inverter greater than described inverter if be used for described DC bus-bar voltage greater than predetermined threshold value.
Further, described device also comprises:
Modulation module is used to open the inversion module that described inverter comprises, modulates described inversion module, makes described inversion module output power-frequency voltage, to increase the loss of described inverter;
Injection module is used for injecting harmonic wave to the power-frequency voltage of described inversion module output, to increase the loss of described inverter.
Further, described device also comprises:
Opening module, be used to open the DCDC(Direct Current Direct Current that described inverter comprises, DC-DC) module increases the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises by described DCDC module, to increase the loss of described inverter.
Further, described injection module is used for obtaining the harmonic wave injection rate according to the type of described inverter, according to described harmonic wave injection rate, increases harmonic wave on the modulating wave of the power-frequency voltage that described inversion module is exported.
Further, described device also comprises:
Closing module is used for closing the driving of described inverter, makes described inverter be in minimum idling consumption state.
Further, described startup module is used to obtain the time that described DC bus-bar voltage continues greater than described predetermined threshold value, if the time of obtaining reaches Preset Time, then determine of the loss of the load capacity of described photovoltaic module, and start described inverter greater than described inverter.
In embodiments of the present invention, be under net state, increase the loss of described inverter gradually at inverter; Measure the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises; If described DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than described inverter, and is started described inverter.Adopt technical scheme provided by the invention, can detect the load capacity of described photovoltaic module accurately, and can not produce high voltage in the testing process, big electric current, thereby can not influence life-span of described inverter, further, this method is applicable to the inverter of any type.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure chart of a kind of twin-stage type inverter of providing of the embodiment of the invention;
Fig. 2 is the structure chart of a kind of single-stage type inverter of providing of the embodiment of the invention;
Fig. 3 is a kind of method flow diagram that starts inverter that the embodiment of the invention 1 provides;
Fig. 4 be the embodiment of the invention 2 provide another start the method flow diagram of inverter;
Fig. 5 be the embodiment of the invention 3 provide another start the method flow diagram of inverter;
Fig. 6 is a kind of apparatus structure schematic diagram that starts inverter that the embodiment of the invention 4 provides;
Fig. 7 be the embodiment of the invention 4 provide another start the apparatus structure schematic diagram of inverter.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention provides a kind of inverter, and inverter comprises twin-stage type inverter and single-stage type inverter.
Referring to Fig. 1, a kind of twin-stage type inverter that the embodiment of the invention provides, this twin-stage type inverter comprise DCDC module 101, dc-link capacitance 102, DC bus-bar voltage sampling module 103, inversion module 104 and and network relay 105;
The input of DCDC module 101 links to each other with the output of photovoltaic module 106; First output of DCDC module 101 is connected to the first input end of inversion module 104 by first line, and second output of DCDC module 101 is connected to second input of inversion module 104 by second line; One end of dc-link capacitance 102 is connected on first line, and the other end is connected on second line; One end of DC bus-bar voltage sampling module 103 is connected on first line, and the other end is connected on second line; The output of inversion module 104 with and the input of network relay 105 link to each other, and the output of network relay 105 links to each other with electrical network 107.
Wherein, inversion module 104 can be DCAC(Direct Current Alternating Current, and direct current is delivered stream) module.
Referring to Fig. 2, a kind of single-stage type inverter that the embodiment of the invention provides, this single-stage type inverter comprise dc-link capacitance 102, DC bus-bar voltage sampling module 103, inversion module 104 and and network relay 105;
The first input end of inversion module 104 is connected to first output of photovoltaic module 106 by first line, and second input of inversion module 104 is connected to first output of photovoltaic module 106 by second line; One end of dc-link capacitance 102 is connected on first line, and the other end is connected on second line; One end of DC bus-bar voltage sampling module 103 is connected on first line, and the other end is connected on second line; The output of inversion module 104 with and the input of network relay 105 link to each other, and the output of network relay 105 links to each other with electrical network 107.
Embodiment 1
A kind of method flow diagram that starts inverter that the embodiment of the invention provides.Wherein, referring to Fig. 3, come starting the inverter shown in above-mentioned Fig. 1 or 2 by the method that the embodiment of the invention provides, this method comprises:
201: be under net state at inverter, increase the loss of this inverter gradually;
202: the DC bus-bar voltage of measuring the dc-link capacitance two ends that this inverter comprises;
203: if this DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than this inverter, and started this inverter.
Further, should be under net state, increase the loss of this inverter gradually, comprise at inverter:
Open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module output power-frequency voltage, to increase the loss of this inverter;
In the power-frequency voltage of this inversion module output, inject harmonic wave, to increase the loss of this inverter.
Further, this also comprises inject harmonic wave in the power-frequency voltage of this inversion module output after:
Open the DCDC(Direct Current Direct Current that this inverter comprises, DC-DC) module, increase the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises by this DCDC module, to increase the loss of this inverter.
Further, this injects harmonic wave in the power-frequency voltage of the output of this inversion module, comprising:
Obtain the harmonic wave injection rate according to the type of this inverter,, on the modulating wave of the power-frequency voltage that this inversion module is exported, increase harmonic wave according to this harmonic wave injection rate.
Further, this increases before the loss of this inverter gradually, also comprises:
Close the driving in this inverter, make this inverter be in minimum idling consumption state.
Further, this determines the loss of the load capacity of photovoltaic module greater than this inverter, and starts this inverter, comprising:
Obtain the time that this DC bus-bar voltage continues greater than this predetermined threshold value,, then determine of the loss of the load capacity of this photovoltaic module, and start this inverter greater than this inverter if the time of obtaining reaches Preset Time.
In embodiments of the present invention, be under net state, increase the loss of this inverter gradually at inverter; Measure the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises; If this DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than this inverter, and is started this inverter.Adopt technical scheme provided by the invention, can detect the load capacity of this photovoltaic module accurately, and can not produce high voltage in the testing process, big electric current, thereby can not influence life-span of this inverter, further, this method is applicable to the inverter of any type.
Embodiment 2
The embodiment of the invention provides a kind of method that starts inverter.Wherein, the method that provides by the embodiment of the invention starts above-mentioned single-stage type inverter shown in Figure 2, as shown in Figure 4, Fig. 4 is a kind of method flow diagram that starts single-stage type inverter that the embodiment of the invention provides, this embodiment is to be that single-stage type inverter is that example describes with this inverter, wherein, this single-stage type inverter includes only inversion module, the loss of being incorporated into the power networks of the minimum of supposing this inverter is 40W, and the open circuit voltage of this photovoltaic module is 700V, for the reliability that guarantees to be incorporated into the power networks, when the load capacity of this photovoltaic module during more than or equal to 60W, start this inverter, wherein, this method comprises:
301: disconnect the also network relay of inverter, this inverter is under net state;
Wherein, this method that starts this inverter is to be under net state at inverter, increase the loss of this inverter gradually, detect the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises, if this DC bus-bar voltage is greater than predetermined threshold value, then determine of the loss of the load capacity of this photovoltaic module greater than this inverter, and start this inverter, therefore, before the load capacity that detects this photovoltaic device, disconnect the also network relay of this inverter, this inverter is under net state.
302: close the driving of the inversion module that this inverter comprises, the current loss that makes this inverter is minimum idling consumption;
Particularly, closing all switches in the driving of the inversion module that this inverter comprises by control method, make all modules in the driving of this inversion module be in non-operating state, is minimum idling consumption thereby make the current loss of this inverter.
Wherein, the driving of this inversion module is that DCAC drives, and this DCAC is a kind of power converter module, can realize direct current energy is transformed to AC energy.
Wherein, in the present embodiment, the DCAC that closes in this inverter drives, and at this moment, the loss of this inverter is about 10W.
Wherein, in this step, the DCAC that closes in this inverter drives, and at this moment, the loss of this inverter is 10W, still less than 60W, needs further to increase the loss of this inverter.
303: open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module output power-frequency voltage, increasing the loss of this inverter;
Particularly, open the inversion module that this inverter comprises by control method, and regulate turning on and off the time of switch that this inverter comprises, to regulate this inversion module, make this inversion module output power-frequency voltage, the loss of this inverter will increase this moment.
Wherein, this inversion module can be the DCAC module, this power-frequency voltage is meant the power industry of national regulation and the unified standard voltage of power consumption equipment, influence owing to the imbalance of industrial development all over the world and reasons such as the controlling of colonizing during the Second World War, power-frequency voltage does not have unified standard in the whole world, the variant regional differences in various countries is very big, and China's single phase poaer supply power-frequency voltage is 50HZ, 220V; China's three phase mains power-frequency voltage is 50HZ, 380V.
Wherein, in this step, open the inversion module that this inverter comprises, modulate this inversion module, make the power-frequency voltage of this inversion module output 50HZ, 220V, at this moment, the current loss of this inverter is about 35W.
Wherein, the current loss of this inverter needs further to increase the loss of this inverter still less than 60W.
304: in the power-frequency voltage of this inversion module output, inject harmonic wave, to increase the loss of this inverter;
Particularly, obtain the harmonic wave injection rate,, on the modulating wave of the power-frequency voltage that this inversion module is exported, increase harmonic wave according to this harmonic wave injection rate according to the type of this inverter.
Wherein, the operation of obtaining the harmonic wave injection rate according to the type of this inverter, can for: according to the type of this inverter, from the corresponding relation of the type of the inverter stored and harmonic wave injection rate, obtain corresponding harmonic wave injection rate.
Wherein, according to the operation of this harmonic wave injection rate, can for: regulate turning on and off the time of switch that this inverter comprises, realize in the power-frequency voltage of this inversion module output, injecting harmonic wave, this harmonic wave can produce harmonic current, thereby can increase the loss of this inverter.
For example, open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module output 50HZ, 220V voltage, this moment, the current loss of this inverter was about 35W, but the loss of this inverter is still less than 60W at this moment, obtain the harmonic wave injection rate according to the type of this inverter, in this step, inject 0.3 times 18 subharmonic in the power-frequency voltage of this inversion module output, this moment, the current loss of this inverter was about 60W.
Wherein, in the power-frequency voltage of the output of this inversion module, inject 0.3 times 18 subharmonic, be meant the harmonic wave of on the modulating wave of the power-frequency voltage of current inversion module output, superpose 18*50HZ=900HZ, 0.3*220V=66V.
305: the DC bus-bar voltage of measuring the dc-link capacitance two ends that this inverter comprises;
Wherein, the current loss of this inverter at this moment judges whether to start this inverter more than or equal to 60W by measuring this DC bus-bar voltage.
306: if this DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of this photovoltaic module greater than this inverter, and started this inverter;
Wherein, predetermined threshold value is meant the lower limit of the DC bus-bar voltage of this inverter under in running order, and in the present embodiment, this predetermined threshold value is 580～600V.
Wherein, under net state, the power output of this photovoltaic module equals the current loss of this inverter, the load capacity of this photovoltaic module is more than or equal to the power output of this photovoltaic module, the current loss of this inverter is greater than the loss of being incorporated into the power networks of this inverter, if this DC bus-bar voltage during greater than this predetermined threshold value, is then determined the be incorporated into the power networks loss of the load capacity of this photovoltaic module greater than this inverter, and is started this inverter.
307: if this DC bus-bar voltage during less than this predetermined threshold value, is then determined the loss of the load capacity of this photovoltaic module less than this inverter, and execution in step 302.
Further, determine of the loss of the load capacity of this photovoltaic module, and start this inverter, comprising greater than this inverter:
Obtain the time that this DC bus-bar voltage continues greater than this predetermined threshold value,, then determine of the loss of the load capacity of this photovoltaic module, and start this inverter greater than this inverter if the time of obtaining reaches Preset Time.
In embodiments of the present invention, be under net state, increase the loss of this inverter gradually at inverter; Measure the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises; If this DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than this inverter, and is started this inverter.Adopt technical scheme provided by the invention, can detect the load capacity of this photovoltaic module accurately, and can not produce high voltage in the testing process, big electric current, thereby can not influence life-span of this inverter, further, this method is applicable to the inverter of any type.
Embodiment 3
A kind of method flow diagram that starts inverter that the embodiment of the invention provides.Wherein, the method that provides by the embodiment of the invention starts above-mentioned twin-stage type inverter shown in Figure 1, as shown in Figure 5, Fig. 5 is a kind of method flow diagram that starts twin-stage type inverter that the embodiment of the invention provides, this embodiment is to be that twin-stage type inverter is that example describes with this inverter, wherein, this twin-stage type inverter comprises inversion module and DCDC module, the loss of being incorporated into the power networks of the minimum of supposing this inverter is 40W, and the open circuit voltage of this photovoltaic module is 400V, for the reliability that guarantees to be incorporated into the power networks, when the load capacity of this photovoltaic module during more than or equal to 60W, start this inverter, wherein, this method comprises:
401: disconnect the also network relay of this inverter, this inverter is under net state;
Wherein, this method that starts this inverter is to be under net state at inverter, increase the loss of this inverter gradually, detect the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises, if this DC bus-bar voltage is greater than predetermined threshold value, then determine of the loss of the load capacity of this photovoltaic module greater than this inverter, and start this inverter, therefore, before the load capacity that detects this photovoltaic device, disconnect the also network relay of this inverter, this inverter is under net state.
402: the driving, the DCDC that close the inversion module that this inverter comprises drive, and the current loss that makes this inverter is minimum idling consumption;
Particularly, close the driving of the inversion module that this inverter comprises and DCDC all switches in driving by control method, making the driving, DCDC of this inversion module all modules in driving be in non-operating state, is minimum idling consumption thereby make the current loss of this inverter.
Wherein, the driving of this inversion module is that DCAC drives, DCAC is a kind of power converter module, can realize direct current energy is transformed to AC energy, DCDC also is a kind of power converter module, can realize direct current energy is transformed to direct current energy, in the present embodiment, DCDC is converted to big direct voltage in order to realize with less direct voltage.
Wherein, in the present embodiment, the DCAC that closes in this inverter drives and the DCDC driving, and at this moment, the loss of this inverter is 10W.
Wherein, in step, the DCAC, the DCDC that close in this inverter drive, and at this moment, the loss of this inverter is 10W, still less than 60W, needs further to increase the loss of this inverter.
403: open the inversion module that this inverter comprises, regulate the output voltage of this inversion module, make this inversion module output power-frequency voltage, to increase the loss of this inverter;
Particularly, open the inversion module that this inverter comprises by control method, and regulate turning on and off the time of switch that this inverter comprises, to regulate this inversion module, make this inversion module output power-frequency voltage, the loss of this inverter will increase this moment.
Wherein, this inversion module can be the DCAC module, in this step, opens the DCAC module that this inverter comprises, and modulates this DCAC module, makes the power-frequency voltage of this DCAC module output 50HZ, 220V, and at this moment, the current loss of this inverter is about 30W.
Wherein, the current loss of this inverter needs further to increase the loss of this inverter still less than 60W.
404: in the power-frequency voltage of this inversion module output, inject harmonic wave, to increase the loss of this inverter;
Particularly, obtain the harmonic wave injection rate,, on the modulating wave of the power-frequency voltage that this inversion module is exported, increase harmonic wave according to this harmonic wave injection rate according to the type of this inverter.
Wherein, the operation of obtaining the harmonic wave injection rate according to the type of this inverter, can for: according to the type of this inverter, from the corresponding relation of the type of the inverter stored and harmonic wave injection rate, obtain corresponding harmonic wave injection rate.
Wherein, according to the operation of this harmonic wave injection rate, can for: regulate turning on and off the time of switch that this inverter comprises, realize in the power-frequency voltage of this inversion module output, injecting harmonic wave, this harmonic wave can produce harmonic current, thereby can increase the loss of this inverter.
For example, open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module output 50HZ, 220V voltage, this moment, the current loss of this inverter was about 30W, but the current loss of this inverter is still less than 60W at this moment, obtain the harmonic wave injection rate according to the type of this inverter, in this step, inject 0.3 times 18 subharmonic in the voltage of this inversion module output, this moment, the current loss of this inverter was about 50W.
Wherein, the current loss of this inverter at this moment needs further to increase the loss of this inverter still less than 60W.
405: open the DCDC module that this inverter comprises, increase the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises by this DCDC module, to increase the loss of this inverter;
Particularly, open the DCDC module that this inverter comprises, increase the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises by this DCDC module, this DC bus-bar voltage can produce dc bus current, thereby can increase the loss of this inverter.
For example, open the DCDC module that this inverter comprises, increase the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises by this DCDC module, this moment, the current loss of this inverter was about 60W.
406: the DC bus-bar voltage of measuring the dc-link capacitance two ends that this inverter comprises;
Wherein, the current loss of this inverter at this moment judges whether to start this inverter more than or equal to 60W by measuring this DC bus-bar voltage.
407: if this DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of this photovoltaic module greater than this inverter, and started this inverter;
Wherein, predetermined threshold value is meant the lower limit of the DC bus-bar voltage of this inverter under in running order, and in the present embodiment, this predetermined threshold value is 580～600V.
Wherein, under net state, the power output of this photovoltaic module equals the current loss of this inverter, the load capacity of this photovoltaic module is more than or equal to the power output of this photovoltaic module, the current loss of this inverter is greater than the loss of being incorporated into the power networks of this inverter, if this DC bus-bar voltage during greater than this predetermined threshold value, is then determined the be incorporated into the power networks loss of the load capacity of this photovoltaic module greater than this inverter, and is started this inverter.
408: if this DC bus-bar voltage during less than this predetermined threshold value, is then determined the loss of the load capacity of this photovoltaic module less than this inverter, and execution in step 402.
Further, determine of the loss of the load capacity of this photovoltaic module, and start this inverter, comprising greater than this inverter:
Obtain the time that this DC bus-bar voltage continues greater than this predetermined threshold value,, then determine of the loss of the load capacity of this photovoltaic module, and start this inverter greater than this inverter if the time of obtaining reaches Preset Time.
Particularly, write down time started and the concluding time of this DC bus-bar voltage greater than this predetermined threshold value, calculate this DC bus-bar voltage greater than the time started of this predetermined threshold value and the time difference between the concluding time, this time difference is defined as the time that this DC bus-bar voltage continues greater than this predetermined threshold value, if the DC bus-bar voltage of obtaining reaches this Preset Time greater than the time that this predetermined threshold value continues, then determine of the loss of the load capacity of this photovoltaic module, and start this inverter greater than this inverter.
In embodiments of the present invention, be under net state, increase the loss of this inverter gradually at inverter; Measure the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises; If this DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than this inverter, and is started this inverter.Adopt technical scheme provided by the invention, can detect the load capacity of this photovoltaic module accurately, and can not produce high voltage in the testing process, big electric current, thereby can not influence life-span of this inverter, further, this method is applicable to the inverter of any type.
Embodiment 4
As described in Figure 6, Fig. 6 is a kind of apparatus structure schematic diagram that starts inverter that the embodiment of the invention provides, and wherein, this device comprises:
Further, as described in Figure 7, Fig. 7 be the embodiment of the invention provide another start the apparatus structure schematic diagram of inverter, this device comprises: increase module 501, measurement module 502 and start module 503, further, this device also comprises:
Further, this device also comprises:
Further, this injection module 505 is used for obtaining the harmonic wave injection rate according to the type of this inverter, according to this harmonic wave injection rate, increases harmonic wave on the modulating wave of the power-frequency voltage that this inversion module is exported.
Further, this device also comprises:
Further, this starts module 503, is used to obtain the time that this DC bus-bar voltage continues greater than this predetermined threshold value, if the time of obtaining reaches Preset Time, then determines the loss of the load capacity of photovoltaic module greater than this inverter, and starts this inverter.
In embodiments of the present invention, be under net state, increase the loss of this inverter gradually at inverter; Measure the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises; If this DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than this inverter, and is started this inverter.Adopt technical scheme provided by the invention, can detect the load capacity of this photovoltaic module accurately, and can not produce high voltage in the testing process, big electric current, thereby can not influence life-span of this inverter, further, this method is applicable to the inverter of any type.
Need to prove: the device of the startup inverter that the foregoing description provides is when starting inverter, only the division with above-mentioned each functional module is illustrated, in the practical application, can as required the above-mentioned functions distribution be finished by different functional modules, the internal structure that is about to device is divided into different functional modules, to finish all or part of function described above.In addition, the device of the startup inverter that the foregoing description provides belongs to same design with the method embodiment that starts inverter, and its specific implementation process sees method embodiment for details, repeats no more here.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be finished by hardware, also can instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a method that starts inverter is characterized in that, described method comprises:
Be under net state at inverter, increase the loss of described inverter gradually;
Measure the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises;
If described DC bus-bar voltage greater than predetermined threshold value, is then determined the loss of the load capacity of photovoltaic module greater than described inverter, and is started described inverter.
2. method according to claim 1 is characterized in that, describedly is under net state at inverter, increases the loss of described inverter gradually, comprising:
Open the inversion module that described inverter comprises, modulate described inversion module, make described inversion module output power-frequency voltage, to increase the loss of described inverter;
In the power-frequency voltage of described inversion module output, inject harmonic wave, to increase the loss of described inverter.
3. method according to claim 2 is characterized in that, describedly injects after the harmonic wave in the power-frequency voltage of described inversion module output, also comprises:
Open the DCDC(Direct Current Direct Current that described inverter comprises, DC-DC) module, increase the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises by described DCDC module, to increase the loss of described inverter.
4. method according to claim 2 is characterized in that, injects harmonic wave in the power-frequency voltage of described output to described inversion module, comprising:
Obtain the harmonic wave injection rate according to the type of described inverter,, on the modulating wave of the power-frequency voltage that described inversion module is exported, increase harmonic wave according to described harmonic wave injection rate.
5. method according to claim 1 is characterized in that, before the described loss that increases described inverter gradually, also comprises:
Close the driving in the described inverter, make described inverter be in minimum idling consumption state.
6. method according to claim 1 is characterized in that, the load capacity of described definite photovoltaic module is greater than the loss of described inverter, and starts described inverter, comprising:
Obtain the time that described DC bus-bar voltage continues greater than described predetermined threshold value,, then determine of the loss of the load capacity of described photovoltaic module, and start described inverter greater than described inverter if the time of obtaining reaches Preset Time.
7. a device that starts inverter is characterized in that, described device comprises:
Increase module, be used for being under net state, increase the loss of described inverter gradually at inverter;
Measurement module is used to measure the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises;
Start module,, then determine of the loss of the load capacity of photovoltaic module, and start described inverter greater than described inverter if be used for described DC bus-bar voltage greater than predetermined threshold value.
8. device according to claim 7 is characterized in that, described device also comprises:
Modulation module is used to open the inversion module that described inverter comprises, modulates described inversion module, makes described inversion module output power-frequency voltage, to increase the loss of described inverter;
Injection module is used for injecting harmonic wave to the power-frequency voltage of described inversion module output, to increase the loss of described inverter.
9. device according to claim 8 is characterized in that, described device also comprises:
Opening module, be used to open the DCDC(Direct Current Direct Current that described inverter comprises, DC-DC) module increases the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises by described DCDC module, to increase the loss of described inverter.
10. device according to claim 8 is characterized in that, described injection module is used for obtaining the harmonic wave injection rate according to the type of described inverter, according to described harmonic wave injection rate, increases harmonic wave on the modulating wave of the power-frequency voltage that described inversion module is exported.
11. device according to claim 7 is characterized in that, described device also comprises:
Closing module is used for closing the driving of described inverter, makes described inverter be in minimum idling consumption state.
12. device according to claim 7, it is characterized in that, described startup module, be used to obtain the time that described DC bus-bar voltage continues greater than described predetermined threshold value, if the time of obtaining reaches Preset Time, then determine of the loss of the load capacity of described photovoltaic module, and start described inverter greater than described inverter.
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