CN103227560B - Start the method and apparatus of inverter - Google Patents
Start the method and apparatus of inverter Download PDFInfo
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- CN103227560B CN103227560B CN201310105294.XA CN201310105294A CN103227560B CN 103227560 B CN103227560 B CN 103227560B CN 201310105294 A CN201310105294 A CN 201310105294A CN 103227560 B CN103227560 B CN 103227560B
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Abstract
The invention discloses a kind of method and apparatus starting inverter, belong to power domain.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 is greater than predetermined threshold value, then determines that the load capacity of photovoltaic module is greater than the loss of described inverter, and start described inverter; Described device comprises: increase module, measurement module and start module, the present invention is by being under net state at inverter, increase the loss of described inverter gradually, measure described DC bus-bar voltage to determine whether to start this inverter, described photovoltaic module load capacity can be detected accurately, the life-span of described inverter can not be affected because of the load capacity of the described photovoltaic module of detection, further, the method is applicable to the inverter of any type.
Description
Technical field
The present invention relates to power domain, particularly a kind of method and apparatus starting inverter.
Background technology
The effect of inverter is that the direct current energy of photovoltaic module is transformed to AC energy feed-in electrical network, when invertor operation, will produce certain loss, when only having the load capacity of photovoltaic module to be greater than the loss of inverter, just starts this inverter and to be connected to the grid operation.
Prior art provides a kind of method starting inverter, can be: the load capacity of photovoltaic module increases along with the enhancing of illumination, the short circuit current of photovoltaic module is equally also increase along with the enhancing of illumination, the method detects the short circuit current at inverter two ends in real time, if detect that short circuit current reaches predetermined threshold value, then start this inverter.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
Illumination is different because of the difference of the type of photovoltaic module on the impact 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, now starts the electric energy that inverter can consume electrical network; In addition, when illumination is very strong, short circuit current can be very large, and the detection carrying out short circuit current can affect the life-span of inverter.
Summary of the invention
In order to solve the problem of prior art, embodiments provide 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 is greater than predetermined threshold value, then determines that the load capacity of photovoltaic module is greater than the loss of described inverter, and start described inverter;
Wherein, be describedly under net state at inverter, increase the loss of described inverter gradually, comprising:
Open the inversion module that described inverter comprises, modulate described inversion module, make described inversion module export power-frequency voltage, to increase the loss of described inverter;
Harmonic in the power-frequency voltage that described inversion module exports, to increase the loss of described inverter.
Further, described after harmonic in the power-frequency voltage that described inversion module exports, also comprise:
Open DCDC (the Direct Current Direct Current that described inverter comprises, DC-DC) module, the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises is increased, to increase the loss of described inverter by described DCDC module.
Further, harmonic in the power-frequency voltage of the described output to described inversion module, comprising:
Obtain harmonic injection amount according to the type of described inverter, according to described harmonic injection amount, the modulating wave of the power-frequency voltage exported at described inversion module increases harmonic wave.
Further, described increase the loss of described inverter gradually before, also comprise:
Close the driving in described inverter, make described inverter be in minimum idling consumption state.
Further, describedly determine the loss that the load capacity of photovoltaic module is greater than described inverter, and start described inverter, comprising:
Obtain described DC bus-bar voltage and be greater than the described predetermined threshold value lasting time, if the time obtained reaches Preset Time, then determine that the load capacity of described photovoltaic module is greater than the loss of described inverter, and start described inverter.
On the other hand, provide a kind of startup DC-to-AC converter, described device comprises:
Increasing module, for being at inverter under net state, increasing the loss of described inverter gradually;
Modulation module, for opening the inversion module that described inverter comprises, modulates described inversion module, makes described inversion module export power-frequency voltage, to increase the loss of described inverter;
Injection module, for harmonic in the power-frequency voltage that exports to described inversion module, to increase the loss of described inverter;
Measurement module, for measuring the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises;
Start module, if be greater than predetermined threshold value for described DC bus-bar voltage, then determine that the load capacity of photovoltaic module is greater than the loss of described inverter, and start described inverter.
Further, described device also comprises:
Opening module, for opening DCDC (the Direct Current Direct Current that described inverter comprises, DC-DC) module, the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises is increased, to increase the loss of described inverter by described DCDC module.
Further, described injection module, for obtaining harmonic injection amount according to the type of described inverter, according to described harmonic injection amount, the modulating wave of the power-frequency voltage exported at described inversion module increases harmonic wave.
Further, described device also comprises:
Closing module, for closing the driving in described inverter, makes described inverter be in minimum idling consumption state.
Further, described startup module, is greater than the described predetermined threshold value lasting time, if the time obtained reaches Preset Time for obtaining described DC bus-bar voltage, then determine that the load capacity of described photovoltaic module is greater than the loss of described inverter, and start described inverter.
In embodiments of the present invention, 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 is greater than predetermined threshold value, then determines that the load capacity of photovoltaic module is greater than the loss of described inverter, and start described inverter.Adopt technical scheme provided by the invention, the load capacity of described photovoltaic module can be detected accurately, and high voltage, big current can not be produced in testing process, thus the life-span of described inverter can not be affected, further, the method is applicable to the inverter of any type.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structure chart of a kind of twin-stage type inverter that the embodiment of the present invention provides;
Fig. 2 is the structure chart of a kind of single-stage type inverter that the embodiment of the present invention provides;
Fig. 3 is a kind of method flow diagram starting inverter that the embodiment of the present invention 1 provides;
Fig. 4 is the method flow diagram of another startup inverter that the embodiment of the present invention 2 provides;
Fig. 5 is the method flow diagram of another startup inverter that the embodiment of the present invention 3 provides;
Fig. 6 is a kind of apparatus structure schematic diagram starting inverter that the embodiment of the present invention 4 provides;
Fig. 7 is the apparatus structure schematic diagram of another startup inverter that the embodiment of the present invention 4 provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiments provide a kind of inverter, inverter comprises twin-stage type inverter and single-stage type inverter.
See Fig. 1, a kind of twin-stage type inverter that the embodiment of the present 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 is connected 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 the first line, the second output of DCDC module 101 is connected to the second input of inversion module 104 by the second line; One end of dc-link capacitance 102 is connected on the first line, and the other end is connected on the second line; One end of DC bus-bar voltage sampling module 103 is connected on the first line, and the other end is connected on the second line; The output of inversion module 104 with and the input of network relay 105 be connected, and the output of network relay 105 is connected with electrical network 107.
Wherein, inversion module 104 can be DCAC (Direct Current Alternating Current, direct current delivers stream) module.
See Fig. 2, a kind of single-stage type inverter that the embodiment of the present 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 the first output of photovoltaic module 106 by the first line, the second input of inversion module 104 is connected to the first output of photovoltaic module 106 by the second line; One end of dc-link capacitance 102 is connected on the first line, and the other end is connected on the second line; One end of DC bus-bar voltage sampling module 103 is connected on the first line, and the other end is connected on the second line; The output of inversion module 104 with and the input of network relay 105 be connected, and the output of network relay 105 is connected with electrical network 107.
Embodiment 1
A kind of method flow diagram starting inverter that the embodiment of the present invention provides.Wherein, see Fig. 3, the method provided by the embodiment of the present invention is come starting the inverter shown in above-mentioned Fig. 1 or 2, and the method comprises:
201: be under net state at inverter, increase the loss of this inverter gradually;
202: the DC bus-bar voltage measuring the dc-link capacitance two ends that this inverter comprises;
203: if this DC bus-bar voltage is greater than predetermined threshold value, then determine that the load capacity of photovoltaic module is greater than the loss of this inverter, and start this inverter.
Further, should be under net state at inverter, and increase the loss of this inverter gradually, comprising:
Open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module export power-frequency voltage, to increase the loss of this inverter;
Harmonic in the power-frequency voltage that this inversion module exports, to increase the loss of this inverter.
Further, this, to after harmonic in the power-frequency voltage that this inversion module exports, also comprises:
Open DCDC (the Direct Current Direct Current that this inverter comprises, DC-DC) module, the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises is increased, to increase the loss of this inverter by this DCDC module.
Further, this, to harmonic in the power-frequency voltage of the output of this inversion module, comprising:
Obtain harmonic injection amount according to the type of this inverter, according to this harmonic injection amount, the modulating wave of the power-frequency voltage exported at this inversion module increases harmonic wave.
Further, this also comprises before increasing the loss of this inverter gradually:
Close the driving in this inverter, make this inverter be in minimum idling consumption state.
Further, this determines that the load capacity of photovoltaic module is greater than the loss of this inverter, and starts this inverter, comprising:
Obtain this DC bus-bar voltage and be greater than this predetermined threshold value lasting time, if the time obtained reaches Preset Time, then determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter.
In embodiments of the present invention, be under net state at inverter, increase the loss of this inverter gradually; Measure 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 determines that the load capacity of photovoltaic module is greater than the loss of this inverter, and start this inverter.Adopt technical scheme provided by the invention, the load capacity of this photovoltaic module can be detected accurately, and high voltage, big current can not be produced in testing process, thus the life-span of this inverter can not be affected, further, the method is applicable to the inverter of any type.
Embodiment 2
Embodiments provide a kind of method starting inverter.Wherein, the method provided by the embodiment of the present invention starts the single-stage type inverter shown in above-mentioned Fig. 2, as shown in Figure 4, Fig. 4 is a kind of method flow diagram starting single-stage type inverter that the embodiment of the present invention provides, this embodiment is for single-stage type inverter is described for this inverter, wherein, this single-stage type inverter only includes inversion module, suppose that the minimum grid-connected loss of this inverter is 40W, the open circuit voltage of this photovoltaic module is 700V, in order to ensure the reliability be incorporated into the power networks, when the load capacity of this photovoltaic module is more than or equal to 60W, start this inverter, wherein, the method comprises:
301: the also network relay disconnecting inverter, makes this inverter be in under net state;
Wherein, the method of this this inverter of startup is 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 that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter, therefore, before the load capacity detecting this photovoltaic device, disconnect the also network relay of this inverter, this inverter is in under net state.
302: the driving of closing the inversion module that this inverter comprises, make the current drain of this inverter be minimum idling consumption;
Particularly, closed 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, thus make the current drain of this inverter be minimum idling consumption.
Wherein, the driving of this inversion module is that DCAC drives, and this DCAC is a kind of power converter module, and direct current energy can be realized to be transformed to AC energy.
Wherein, in the present embodiment, the DCAC closed in this inverter drives, and now, the loss of this inverter is about 10W.
Wherein, in this step, the DCAC closed in this inverter drives, and now, the loss of this inverter is 10W, is still less than 60W, needs the loss increasing this inverter further.
303: open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module export power-frequency voltage, increasing the loss of this inverter;
Particularly, open by control method the inversion module that this inverter comprises, and the switch regulating this inverter to comprise turn on and off the time, to regulate this inversion module, make this inversion module export power-frequency voltage, the now loss of this inverter will increase.
Wherein, this inversion module can be DCAC module, this power-frequency voltage refers to the power industry of national regulation and the unified standard voltage of power consumption equipment, due to the imbalance of industrial development all over the world and the impact of reasons such as controlling of colonizing during the Second World War, the standard that power-frequency voltage is ununified in the whole world, the variant regional differences in various countries is very large, 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 this inversion module export the power-frequency voltage of 50HZ, 220V, now, the current drain of this inverter is about 35W.
Wherein, the current drain of this inverter is still less than 60W, needs the loss increasing this inverter further.
304: harmonic in the power-frequency voltage that this inversion module exports, to increase the loss of this inverter;
Particularly, obtain harmonic injection amount according to the type of this inverter, according to this harmonic injection amount, the modulating wave of the power-frequency voltage exported at this inversion module increases harmonic wave.
Wherein, obtain the operation of harmonic injection amount according to the type of this inverter, Ke Yiwei: according to the type of this inverter, obtains corresponding harmonic injection amount from the type of the inverter stored and the corresponding relation of harmonic injection amount.
Wherein, according to the operation of this harmonic injection amount, Ke Yiwei: the switch regulating this inverter to comprise turn on and off the time, realize harmonic in the power-frequency voltage exported to this inversion module, this harmonic wave can produce harmonic current, thus can increase the loss of this inverter.
Such as, open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module export 50HZ, 220V voltage, now the current drain of this inverter is about 35W, but now the loss of this inverter is still less than 60W, type according to this inverter obtains harmonic injection amount, in this step, in the power-frequency voltage that this inversion module exports, inject 18 subharmonic of 0.3 times, now the current drain of this inverter is about 60W.
Wherein, in the power-frequency voltage of the output of this inversion module, inject 18 subharmonic of 0.3 times, the modulating wave referring to the power-frequency voltage exported at current inversion module superposes the harmonic wave of 18*50HZ=900HZ, 0.3*220V=66V.
305: the DC bus-bar voltage measuring the dc-link capacitance two ends that this inverter comprises;
Wherein, now the current drain of this inverter is more than or equal to 60W, starts this inverter by measuring this DC bus-bar voltage to judge whether.
306: if this DC bus-bar voltage is greater than predetermined threshold value, then determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter;
Wherein, predetermined threshold value refer to this inverter in running order under the lower limit of DC bus-bar voltage, 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 drain 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 drain of this inverter is greater than the grid-connected loss of this inverter, if when this DC bus-bar voltage is greater than this predetermined threshold value, then determines that the load capacity of this photovoltaic module is greater than the grid-connected loss of this inverter, and start this inverter.
307: if when this DC bus-bar voltage is less than this predetermined threshold value, then determine that the load capacity of this photovoltaic module is less than the loss of this inverter, and perform step 302.
Further, determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter, comprising:
Obtain this DC bus-bar voltage and be greater than this predetermined threshold value lasting time, if the time obtained reaches Preset Time, then determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter.
In embodiments of the present invention, be under net state at inverter, increase the loss of this inverter gradually; Measure 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 determines that the load capacity of photovoltaic module is greater than the loss of this inverter, and start this inverter.Adopt technical scheme provided by the invention, the load capacity of this photovoltaic module can be detected accurately, and high voltage, big current can not be produced in testing process, thus the life-span of this inverter can not be affected, further, the method is applicable to the inverter of any type.
Embodiment 3
A kind of method flow diagram starting inverter that the embodiment of the present invention provides.Wherein, the method provided by the embodiment of the present invention starts the twin-stage type inverter shown in above-mentioned Fig. 1, as shown in Figure 5, Fig. 5 is a kind of method flow diagram starting twin-stage type inverter that the embodiment of the present invention provides, this embodiment is for twin-stage type inverter is described for this inverter, wherein, this twin-stage type inverter comprises inversion module and DCDC module, suppose that the minimum grid-connected loss of this inverter is 40W, the open circuit voltage of this photovoltaic module is 400V, in order to ensure the reliability be incorporated into the power networks, when the load capacity of this photovoltaic module is more than or equal to 60W, start this inverter, wherein, the method comprises:
401: the also network relay disconnecting this inverter, makes this inverter be in under net state;
Wherein, the method of this this inverter of startup is 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 that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter, therefore, before the load capacity detecting this photovoltaic device, disconnect the also network relay of this inverter, this inverter is in under net state.
402: close the driving of the inversion module that this inverter comprises, DCDC drives, make the current drain of this inverter be minimum idling consumption;
Particularly, by control method close the driving of the inversion module that this inverter comprises and DCDC drive in all switches, make all modules in the driving of this inversion module, DCDC driving be in non-operating state, thus make the current drain of this inverter be minimum idling consumption.
Wherein, the driving of this inversion module is that DCAC drives, DCAC is a kind of power converter module, direct current energy can be realized to be transformed to AC energy, DCDC is also a kind of power converter module, direct current energy can be realized to be transformed to direct current energy, and in the present embodiment, less direct voltage is converted to larger direct voltage to realize by DCDC.
Wherein, in the present embodiment, the DCAC closed in this inverter drives and DCDC drives, and now, the loss of this inverter is 10W.
Wherein, in step, DCAC, the DCDC closed in this inverter drives, and now, the loss of this inverter is 10W, is still less than 60W, needs the loss increasing this inverter further.
403: open the inversion module that this inverter comprises, regulate the output voltage of this inversion module, make this inversion module export power-frequency voltage, to increase the loss of this inverter;
Particularly, open by control method the inversion module that this inverter comprises, and the switch regulating this inverter to comprise turn on and off the time, to regulate this inversion module, make this inversion module export power-frequency voltage, the now loss of this inverter will increase.
Wherein, this inversion module can be DCAC module, in this step, opens the DCAC module that this inverter comprises, and modulates this DCAC module, and make this DCAC module export the power-frequency voltage of 50HZ, 220V, now, the current drain of this inverter is about 30W.
Wherein, the current drain of this inverter is still less than 60W, needs the loss increasing this inverter further.
404: harmonic in the power-frequency voltage that this inversion module exports, to increase the loss of this inverter;
Particularly, obtain harmonic injection amount according to the type of this inverter, according to this harmonic injection amount, the modulating wave of the power-frequency voltage exported at this inversion module increases harmonic wave.
Wherein, obtain the operation of harmonic injection amount according to the type of this inverter, Ke Yiwei: according to the type of this inverter, obtains corresponding harmonic injection amount from the type of the inverter stored and the corresponding relation of harmonic injection amount.
Wherein, according to the operation of this harmonic injection amount, Ke Yiwei: the switch regulating this inverter to comprise turn on and off the time, realize harmonic in the power-frequency voltage exported to this inversion module, this harmonic wave can produce harmonic current, thus can increase the loss of this inverter.
Such as, open the inversion module that this inverter comprises, modulate this inversion module, make this inversion module export 50HZ, 220V voltage, now the current drain of this inverter is about 30W, but now the current drain of this inverter is still less than 60W, type according to this inverter obtains harmonic injection amount, in this step, in the voltage that this inversion module exports, inject 18 subharmonic of 0.3 times, now the current drain of this inverter is about 50W.
Wherein, now the current drain of this inverter is still less than 60W, needs the loss increasing this inverter further.
405: open the DCDC module that this inverter comprises, increased 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, increased 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, thus can increase the loss of this inverter.
Such as, open the DCDC module that this inverter comprises, increased the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises by this DCDC module, now the current drain of this inverter is about 60W.
406: the DC bus-bar voltage measuring the dc-link capacitance two ends that this inverter comprises;
Wherein, now the current drain of this inverter is more than or equal to 60W, starts this inverter by measuring this DC bus-bar voltage to judge whether.
407: if this DC bus-bar voltage is greater than predetermined threshold value, then determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter;
Wherein, predetermined threshold value refer to this inverter in running order under the lower limit of DC bus-bar voltage, 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 drain 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 drain of this inverter is greater than the grid-connected loss of this inverter, if when this DC bus-bar voltage is greater than this predetermined threshold value, then determines that the load capacity of this photovoltaic module is greater than the grid-connected loss of this inverter, and start this inverter.
408: if when this DC bus-bar voltage is less than this predetermined threshold value, then determine that the load capacity of this photovoltaic module is less than the loss of this inverter, and perform step 402.
Further, determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter, comprising:
Obtain this DC bus-bar voltage and be greater than this predetermined threshold value lasting time, if the time obtained reaches Preset Time, then determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter.
Particularly, record time started and end time that this DC bus-bar voltage is greater than this predetermined threshold value, calculate this DC bus-bar voltage and be greater than time difference between the time started of this predetermined threshold value and end time, is defined as this DC bus-bar voltage this time difference and is greater than this predetermined threshold value lasting time, if the time that the DC bus-bar voltage obtained is greater than this predetermined threshold value lasting reaches this Preset Time, then determine that the load capacity of this photovoltaic module is greater than the loss of this inverter, and start this inverter.
In embodiments of the present invention, be under net state at inverter, increase the loss of this inverter gradually; Measure 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 determines that the load capacity of photovoltaic module is greater than the loss of this inverter, and start this inverter.Adopt technical scheme provided by the invention, the load capacity of this photovoltaic module can be detected accurately, and high voltage, big current can not be produced in testing process, thus the life-span of this inverter can not be affected, further, the 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 starting inverter that the embodiment of the present invention provides, and wherein, this device comprises:
Increasing module 501, for being at inverter under net state, increasing the loss of this inverter gradually;
Measurement module 502, for measuring the DC bus-bar voltage at the dc-link capacitance two ends that this inverter comprises;
Start module 503, if be greater than predetermined threshold value for this DC bus-bar voltage, then determine that the load capacity of photovoltaic module is greater than the loss of this inverter, and start this inverter.
Further, as described in Figure 7, Fig. 7 is the apparatus structure schematic diagram of another startup inverter that the embodiment of the present invention provides, and this device comprises: increase module 501, measurement module 502 and start module 503, further, this device also comprises:
Modulation module 504, for opening the inversion module that this inverter comprises, modulates this inversion module, makes this inversion module export power-frequency voltage, to increase the loss of this inverter;
Injection module 505, for harmonic in the power-frequency voltage that exports to this inversion module, to increase the loss of this inverter.
Further, this device also comprises:
Opening module 506, for opening DCDC (the Direct Current DirectCurrent that this inverter comprises, DC-DC) module, increased 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 injection module 505, for obtaining harmonic injection amount according to the type of this inverter, according to this harmonic injection amount, the modulating wave of the power-frequency voltage exported at this inversion module increases harmonic wave.
Further, this device also comprises:
Closing module 507, for closing the driving in this inverter, makes this inverter be in minimum idling consumption state.
Further, this startup module 503, being greater than this predetermined threshold value lasting time for obtaining this DC bus-bar voltage, if the time obtained reaches Preset Time, then determining that the load capacity of photovoltaic module is greater than the loss of this inverter, and starting this inverter.
In embodiments of the present invention, be under net state at inverter, increase the loss of this inverter gradually; Measure 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 determines that the load capacity of photovoltaic module is greater than the loss of this inverter, and start this inverter.Adopt technical scheme provided by the invention, the load capacity of this photovoltaic module can be detected accurately, and high voltage, big current can not be produced in testing process, thus the life-span of this inverter can not be affected, further, the method is applicable to the inverter of any type.
It should be noted that: the device of the startup inverter that above-described embodiment provides is when starting inverter, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by device is divided into different functional modules, to complete all or part of function described above.In addition, the device of the startup inverter that above-described embodiment provides belongs to same design with the embodiment of the method starting inverter, and its specific implementation process refers to embodiment of the method, repeats no more here.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. start a method for inverter, it 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 is greater than predetermined threshold value, then determines that the load capacity of photovoltaic module is greater than the loss of described inverter, and start described inverter;
Wherein, be describedly under net state at inverter, increase the loss of described inverter gradually, comprising:
Open the inversion module that described inverter comprises, modulate described inversion module, make described inversion module export power-frequency voltage, to increase the loss of described inverter;
Harmonic in the power-frequency voltage that described inversion module exports, to increase the loss of described inverter.
2. method according to claim 1, is characterized in that, described after harmonic in the power-frequency voltage that described inversion module exports, and also comprises:
Open DCDC (the Direct Current Direct Current that described inverter comprises, DC-DC) module, the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises is increased, to increase the loss of described inverter by described DCDC module.
3. method according to claim 1, is characterized in that, harmonic in the power-frequency voltage of the described output to described inversion module, comprising:
Obtain harmonic injection amount according to the type of described inverter, according to described harmonic injection amount, the modulating wave of the power-frequency voltage exported at described inversion module increases harmonic wave.
4. method according to claim 1, is characterized in that, described increase the loss of described inverter gradually before, also comprise:
Close the driving in described inverter, make described inverter be in minimum idling consumption state.
5. method according to claim 1, is characterized in that, describedly determines the loss that the load capacity of photovoltaic module is greater than described inverter, and starts described inverter, comprising:
Obtain described DC bus-bar voltage and be greater than the described predetermined threshold value lasting time, if the time obtained reaches Preset Time, then determine that the load capacity of described photovoltaic module is greater than the loss of described inverter, and start described inverter.
6. start a device for inverter, it is characterized in that, described device comprises:
Increasing module, for being at inverter under net state, increasing the loss of described inverter gradually;
Modulation module, for opening the inversion module that described inverter comprises, modulates described inversion module, makes described inversion module export power-frequency voltage, to increase the loss of described inverter;
Injection module, for harmonic in the power-frequency voltage that exports to described inversion module, to increase the loss of described inverter;
Measurement module, for measuring the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises;
Start module, if be greater than predetermined threshold value for described DC bus-bar voltage, then determine that the load capacity of photovoltaic module is greater than the loss of described inverter, and start described inverter.
7. device according to claim 6, is characterized in that, described device also comprises:
Opening module, for opening DCDC (the Direct Current Direct Current that described inverter comprises, DC-DC) module, the DC bus-bar voltage at the dc-link capacitance two ends that described inverter comprises is increased, to increase the loss of described inverter by described DCDC module.
8. device according to claim 6, is characterized in that, described injection module, for obtaining harmonic injection amount according to the type of described inverter, according to described harmonic injection amount, the modulating wave of the power-frequency voltage exported at described inversion module increases harmonic wave.
9. device according to claim 6, is characterized in that, described device also comprises:
Closing module, for closing the driving in described inverter, makes described inverter be in minimum idling consumption state.
10. device according to claim 6, it is characterized in that, described startup module, the described predetermined threshold value lasting time is greater than for obtaining described DC bus-bar voltage, if the time obtained reaches Preset Time, then determine that the load capacity of described photovoltaic module is greater than the loss of described inverter, and start described inverter.
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| CN105375858B (en) * | 2015-11-19 | 2017-12-26 | 珠海格力电器股份有限公司 | photovoltaic system control method and device |
| CN105762834A (en) * | 2016-03-11 | 2016-07-13 | 深圳茂硕电气有限公司 | Photovoltaic inverter intelligent starting control system |
| CN108631565B (en) * | 2017-03-21 | 2020-04-28 | 赤多尼科两合股份有限公司 | Two-stage switch power supply |
| CN114784876B (en) * | 2022-06-17 | 2022-10-25 | 浙江艾罗网络能源技术股份有限公司 | Detection method for reverse electricity taking of photovoltaic inverter |
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| JP5719714B2 (en) * | 2011-07-22 | 2015-05-20 | 京セラ株式会社 | Startup control method, grid interconnection device, and control device |
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