CN104811027A - Inverter starting method, inverter starting device and inverter starting system - Google Patents
Inverter starting method, inverter starting device and inverter starting system Download PDFInfo
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- CN104811027A CN104811027A CN201410037384.4A CN201410037384A CN104811027A CN 104811027 A CN104811027 A CN 104811027A CN 201410037384 A CN201410037384 A CN 201410037384A CN 104811027 A CN104811027 A CN 104811027A
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- inverter
- voltage
- described inverter
- photovoltaic arrays
- startup
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses an inverter starting method, an inverter starting device and an inverter starting system applicable to a photovoltaic power generation system. Under the condition of not adding any external load, high-voltage startup of an inverter can be completed by taking a bus capacitor of the inverter as a short-term load to clamp the bus voltage of the inverter within an allowable working voltage range of the inverter and quickly outputting energy of a photovoltaic array through the inverter. Therefore, the problem that an inverter cannot be started normally when the output voltage of a photovoltaic array is greater than the allowable working voltage of the inverter currently is solved, and high-voltage startup of an inverter is realized on the basis of not increasing the system cost.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly relate to a kind of the inverter startup method, the Apparatus and system that are applicable to photovoltaic generating system.
Background technology
Photovoltaic generating system (Photovoltaic Power System, be called for short PV or Photovoltaic) refer to the electricity generation system utilizing photovoltaic battery panel solar energy to be converted to electric energy, it possesses the features such as reliability is high, long service life, pollution index are little, has vast potential for future development.
Particularly, the DC side distribution cost of photovoltaic generating system is inversely proportional to DC voltage within the specific limits, therefore, in order to reach the object reducing system cost, suitably can improve the DC voltage of photovoltaic generating system, as brought up to more than 1000V.But, due to for photovoltaic generating system common at present, its photovoltaic battery panel possessed, inverter, DC distribution cable and sky the device such as to be opened and are all allowed to work within the voltage threshold (as 1000V) of setting, do not changing higher withstand voltage bus capacitor, when replacing possesses the electronic device of more nominal power, if the output voltage of the photovoltaic arrays in system (being made up of multiple photovoltaic battery panel) is higher than described voltage threshold, then may there is the problem that the output voltage of photovoltaic arrays damages higher than the inverter that the permission operating voltage of inverter causes, the normal startup of inverter cannot be realized preferably, the operating efficiency of reduction system.
Therefore, need badly and provide a kind of on the basis without the need to changing each mainstream electronic device in existing photovoltaic generating system, the problem that inverter high input voltage starts can be realized.
Summary of the invention
Embodiments provide a kind of the inverter startup method, the Apparatus and system that are applicable to photovoltaic generating system, the output voltage in order to solve the photovoltaic arrays existed at present is greater than the problem that when inverter allows operating voltage, inverter cannot normally start.
Embodiments provide a kind of inverter startup method, be applicable to, in photovoltaic generating system, comprising:
Before startup inverter, obtain the output voltage of photovoltaic arrays;
The output voltage of the described photovoltaic arrays got if determine is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter; And,
If determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
Further, described method also comprises:
The output voltage of the described photovoltaic arrays got if determine is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter.
Correspondingly, the embodiment of the present invention additionally provides a kind of inverter startup device, is applicable to, in photovoltaic generating system, comprising:
Voltage acquisition module, for before startup inverter, obtains the output voltage of photovoltaic arrays;
Start control module, if for determining that the output voltage of the described photovoltaic arrays that described voltage acquisition module gets is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter; And, after pretrigger is carried out to described inverter, if determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
Further, described startup control module, if also for determining that the output voltage of the described photovoltaic arrays that described voltage acquisition module gets is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter.
Further, the embodiment of the present invention additionally provides a kind of inverter startup system, be applicable in photovoltaic generating system, comprise photovoltaic arrays and inverter, also comprise voltage check device and inverter startup device, wherein:
Described voltage check device, for detecting the output voltage of described photovoltaic arrays;
Described inverter startup device, for before the described inverter of startup, obtain the output voltage of the described photovoltaic arrays that described voltage check device detects, and, the output voltage of the described photovoltaic arrays got if determine is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter; And, after pretrigger is carried out to described inverter, if determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
Further, described inverter startup device, if also for determining that the output voltage of the described photovoltaic arrays got is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter.
Further, described inverter startup system also comprises the first switch, described first switch-linear hybrid is in the first line of the first input end of the first output and described inverter for connecting described photovoltaic arrays, further, the second output of described photovoltaic arrays is connected by the second line with the second input of described inverter;
Described inverter startup device, specifically for issuing Closed control instruction to described first switch, indicates described first switch to carry out closed procedure, with photovoltaic arrays described in conducting and the connection between described inverter.
Further, described inverter startup system also comprises the first soft starting circuit, wherein:
Described first soft starting circuit comprises the first series circuit be made up of the soft start resistance of connecting successively and second switch, and one end of described first series circuit is connected with the first output of described photovoltaic arrays, the other end is connected with the first input end of described inverter;
Described inverter startup device, specifically for issuing Closed control instruction to described second switch, indicates described second switch to carry out closed procedure, to realize the pretrigger to described inverter.
Further, described inverter startup system also comprises the second soft starting circuit, wherein:
Described second soft starting circuit comprise with described inverter parallel, the second series circuit of comprising the 3rd switch and the alternating current soft starter of connecting successively, wherein, one end of described 3rd switch is connected with electrical network, the other end is connected with the input of described alternating current soft starter, first output of described alternating current soft starter is connected with the first input end of described inverter, and the second output of described alternating current soft starter is connected with the second input of described inverter;
Described inverter startup device, specifically for issuing Closed control instruction to described 3rd switch, indicates described 3rd switch to carry out closed procedure, to realize the pretrigger to described inverter.
Beneficial effect of the present invention is as follows:
Embodiments provide a kind of inverter startup method being applicable to photovoltaic generating system, Apparatus and system, due to can when not increasing any applied load, by the bus capacitor of inverter itself as short-time load by the busbar voltage clamper of inverter in the permission operating voltage range of inverter, and by inverter rapidly by the Energy transmission of described photovoltaic arrays, thus the output voltage solving the photovoltaic arrays existed at present is greater than the problem that when inverter allows operating voltage, inverter cannot normally start, do not increasing on the basis of system cost, achieve the high voltage startup of inverter.
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 introduced, 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.
Figure 1 shows that the schematic flow sheet of inverter startup method described in the embodiment of the present invention one;
Figure 2 shows that the structural representation one of photovoltaic generating system described in the embodiment of the present invention one;
Figure 3 shows that the structural representation two of photovoltaic generating system described in the embodiment of the present invention one;
Figure 4 shows that the structural representation three of photovoltaic generating system described in the embodiment of the present invention one;
After Figure 5 shows that the connection described in the embodiment of the present invention one described in conducting between photovoltaic arrays and described inverter, the change in voltage schematic diagram of the photovoltaic arrays in described photovoltaic generating system and inverter;
Figure 6 shows that the structural representation of inverter startup device described in the embodiment of the present invention two;
Figure 7 shows that the structural representation one of inverter startup system described in the embodiment of the present invention three;
Figure 8 shows that the structural representation two of inverter startup system described in the embodiment of the present invention three;
Figure 9 shows that the structural representation three of inverter startup system described in the embodiment of the present invention three.
Embodiment
Embodiments provide a kind of inverter startup method being applicable to photovoltaic generating system, Apparatus and system, described method comprises: before startup inverter, obtain the output voltage of photovoltaic arrays, and when the output voltage of the described photovoltaic arrays determining to get is greater than the permission operating voltage of inverter and is not more than the upper voltage limit value of setting, pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter is maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter, and, if determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
In embodiment of the present invention, due to can when not increasing any applied load, by the bus capacitor of inverter itself as short-time load by the busbar voltage clamper of inverter in the permission operating voltage range of inverter, and by inverter rapidly by the Energy transmission of described photovoltaic arrays, thus the output voltage solving the photovoltaic arrays existed at present is greater than the problem that when inverter allows operating voltage, inverter cannot normally start, do not increasing on the basis of system cost, achieving the high voltage startup of inverter.
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one:
As shown in Figure 1, it is the schematic flow sheet of inverter startup method described in the embodiment of the present invention one, and described inverter startup method is applicable in photovoltaic generating system, and the embodiment of the present invention is not limited in any way this.Particularly, described inverter startup method can comprise the following steps:
Step 101: before startup inverter, obtain the output voltage of photovoltaic arrays.
Particularly, in embodiment of the present invention, voltage obtain manner conventional in prior art can be adopted, obtain the output voltage of described photovoltaic arrays.Such as, by obtaining the mode of the output voltage of the described photovoltaic arrays that voltage check device detects, obtain the output voltage of described photovoltaic arrays, the embodiment of the present invention does not repeat this.
Step 102: the output voltage of the described photovoltaic arrays got if determine is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter.
Particularly, in embodiment of the present invention, pretrigger is carried out to described inverter, can comprise:
By starting the mode of the arbitrary soft starting circuit be arranged in photovoltaic generating system, pretrigger is carried out to described inverter.
Particularly, as shown in Figure 2 (Fig. 2 is the structural representation one of photovoltaic generating system described in the embodiment of the present invention one), described photovoltaic generating system can comprise the first soft starting circuit, wherein, described first soft starting circuit can comprise the first series circuit be made up of the soft start resistance (R) of connecting successively and second switch (Q2), and one end of described first series circuit is connected with the first output of described photovoltaic arrays, the other end is connected with the first input end of described inverter; Have again, first line of the first output also by being provided with the first switch (Q1) of described photovoltaic arrays is connected with the first input end of described inverter, second output of described photovoltaic arrays can be connected by the second line with the second input of described inverter, further, described inverter can comprise the bus capacitor (C) and the inverted power module etc. for carrying out DC-AC conversion that one end is connected with described first line, the other end is connected with described second line usually.It should be noted that in addition, the output of described inverter also can be connected with electrical network (as the Grid of Fig. 2, being called for short G) usually, and the embodiment of the present invention is not limited in any way this.
Correspondingly, pretrigger is carried out to described inverter, can comprise:
Issue Closed control instruction to described second switch (Q2), indicate described second switch (Q2) to carry out closed procedure, to realize the pretrigger to described inverter.
Further, as shown in Figure 3 (Fig. 3 is the structural representation two of photovoltaic generating system described in the embodiment of the present invention one), described photovoltaic generating system also can comprise the second soft starting circuit, wherein,
Described second soft starting circuit comprise with described inverter parallel, the second series circuit of comprising the 3rd switch (Q3) and the alternating current soft starter of connecting successively, wherein, one end of described 3rd switch (Q3) and electrical network are (as the Grid of Fig. 3, be called for short G) be connected, the other end is connected with the input of described alternating current soft starter, first output of described alternating current soft starter is connected with the first input end of described inverter, and the second output of described alternating current soft starter is connected with the second input of described inverter.
Correspondingly, pretrigger is carried out to described inverter, can comprise:
Issue Closed control instruction to described 3rd switch (Q3), indicate described 3rd switch (Q3) to carry out closed procedure, to realize the pretrigger to described inverter.
It should be noted that, as shown in Figure 4 (Fig. 4 is the structural representation three of photovoltaic generating system described in the embodiment of the present invention one), also can possess above-mentioned first soft starting circuit and the second soft starting circuit in described photovoltaic generating system simultaneously, but, when possessing above-mentioned first soft starting circuit and the second soft starting circuit in described photovoltaic generating system simultaneously, described first soft starting circuit and described second soft starting circuit can not start usually simultaneously, namely, at any one time, usually a soft starting circuit is only had to be in starting state, to ensure the normal operation of inverter.
Further, in embodiment of the present invention, also predeterminable in described photovoltaic generating system have other forms of soft starting circuit, and the embodiment of the present invention is not limited in any way this.It should be noted that, in embodiment of the present invention, in default first soft starting circuit and the second soft starting circuit, also can be provided with other electronic devices and components, the embodiment of the present invention is not also limited in any way this again.
It should be noted that in addition, in embodiment of the present invention, described first switch (Q1), described second switch (Q2) or described 3rd switch (Q3) can be in the various switches such as transistor, relay or contactor any one, the embodiment of the present invention is not limited in any way this.
Further, in embodiment of the present invention, in the mode by starting the arbitrary soft starting circuit in photovoltaic generating system, after pretrigger is carried out to described inverter, by the bus controller in described inverter, the busbar voltage of described inverter is maintained a setting voltage value, wherein, described setting voltage value need be not more than the permission operating voltage of described inverter usually, more preferably, usually can there is certain voltage difference between the permission operating voltage of described setting voltage value and described inverter, the embodiment of the present invention does not repeat this.
Step 103: described inverter is in steady-working state if determine, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
Particularly, shown in Fig. 2, Fig. 3 or Fig. 4, because the first input end of described inverter to be connected to the first output of described photovoltaic arrays by the first line being provided with the first switch (Q1), second input of described inverter is connected to the second output of described photovoltaic arrays by the second line, therefore, photovoltaic arrays described in conducting and the connection between described inverter, can comprise:
Issue Closed control instruction to described first switch (Q1), indicate described first switch (Q1) to carry out closed procedure, with photovoltaic arrays described in conducting and the connection between described inverter.
Particularly, (Fig. 5 is for after photovoltaic arrays described in conducting and the connection between described inverter as shown in Figure 5, the change in voltage schematic diagram of the photovoltaic arrays in described photovoltaic generating system and inverter), when after the connection described in the mode conducting by closed described first switch between photovoltaic arrays and described inverter, PV voltage (i.e. photovoltaic arrays output voltage) is clamped to the magnitude of voltage identical with described busbar voltage by by the busbar voltage of described inverter.Now, because the output energy (PV energy) of photovoltaic arrays is larger, therefore, photovoltaic arrays can charge to bus capacitor, busbar voltage is climbed rapidly, correspondingly, can the increase sharply input current of inverter of bus controller (or bus regulation loop) is given, makes the also corresponding increase thereupon of the Energy transmission of inverter; When inverter input, export energy equal time, busbar voltage reaches peak, and after this, busbar voltage can fall after rise rapidly, until the initial setting magnitude of voltage in separate regression steps 102, to realize the high voltage startup of inverter.
Further, in embodiment of the present invention, described method can also comprise the following steps:
If before startup inverter, determine that the output voltage of the described photovoltaic arrays got is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter; Wherein, described voltage lower limit value can be lowest starting voltage required when described inverter can normally start usually, and it can carry out adjustment setting according to the actual conditions of the inverter in system, and the embodiment of the present invention does not repeat this.
Or in embodiment of the present invention, described method can also comprise the following steps:
If before startup inverter, determine that the output voltage of the described photovoltaic arrays got is less than the voltage lower limit value of setting or is greater than the upper voltage limit value of setting, then do not carry out start-up operation to described inverter, the embodiment of the present invention does not repeat this.
The embodiment of the present invention one provides a kind of inverter startup method, due to can when not increasing any applied load, by the bus capacitor of inverter itself as short-time load by the busbar voltage clamper of inverter in the permission operating voltage range of inverter, and pass through the mode of the connection described in conducting between photovoltaic arrays and described inverter, closed photovoltaic arrays is to the bus capacitor of inverter, to pass through inverter rapidly by the Energy transmission of described photovoltaic arrays, thus the output voltage solving the photovoltaic arrays existed at present is greater than the problem that when inverter allows operating voltage, inverter cannot normally start, do not increasing on the basis of system cost, achieve the high voltage startup of inverter.
Embodiment two:
The embodiment of the present invention two provides a kind of inverter startup device that can be used in the present invention method shown in embodiment one, and as shown in Figure 6, it is the structural representation of inverter startup device described in the embodiment of the present invention two.Described inverter startup device is applicable in photovoltaic generating system, and the embodiment of the present invention is not limited in any way this.It should be noted that in addition, described inverter startup device can be the self-contained unit being different from described photovoltaic generating system, and also can be the integrating device be integrated in described photovoltaic generating system, the embodiment of the present invention is not also limited in any way this.
Particularly, described inverter startup device can comprise voltage acquisition module 11 and start control module 12, wherein:
Described voltage acquisition module 11 obtains the output voltage of photovoltaic arrays before being used in and starting inverter.Particularly, in embodiment of the present invention, described voltage acquisition module 11 can adopt voltage obtain manner conventional in prior art, obtains the output voltage of described photovoltaic arrays.Such as, by obtaining the mode of the output voltage of the described photovoltaic arrays that voltage check device detects, obtain the output voltage of described photovoltaic arrays, the embodiment of the present invention does not repeat this.
If described startup control module 12 can be used for determining that the output voltage of the described photovoltaic arrays that described voltage acquisition module 11 gets is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter; And, after pretrigger is carried out to described inverter, if determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
Particularly, in embodiment of the present invention, as shown in figures 2 or 4, described photovoltaic generating system can comprise the first soft starting circuit, wherein:
Described first soft starting circuit can comprise the first series circuit be made up of the soft start resistance of connecting successively and second switch (Q2), and one end of described first series circuit is connected with the first output of described photovoltaic arrays, the other end is connected with the first input end of described inverter.
Correspondingly, described startup control module 12 specifically can be used for issuing Closed control instruction to described second switch (Q2), indicates described second switch (Q2) to carry out closed procedure, to realize the pretrigger to described inverter.
Further, as shown in Figure 3 or Figure 4, described photovoltaic generating system also can comprise the second soft starting circuit, wherein: described second soft starting circuit comprises with described inverter parallel, comprise the second series circuit of the 3rd switch (Q3) and the alternating current soft starter of connecting successively, wherein, one end of described 3rd switch (Q2) is connected with electrical network (G), the other end is connected with the input of described alternating current soft starter, first output of described alternating current soft starter is connected with the first input end of described inverter, second output of described alternating current soft starter is connected with the second input of described inverter.
Correspondingly, described startup control module 12 specifically can be used for issuing Closed control instruction to described 3rd switch (Q3), indicates described 3rd switch (Q3) to carry out closed procedure, to realize the pretrigger to described inverter.
Further, as shown in Fig. 2, Fig. 3 or Fig. 4, described photovoltaic generating system also can comprise the first switch (Q1), described first switch (Q1) is arranged in the first line for the first input end of the first output and described inverter connecting described photovoltaic arrays, further, the second output of described photovoltaic arrays is connected by the second line with the second input of described inverter.
Correspondingly, described startup control module 12 specifically can be used for issuing Closed control instruction to described first switch (Q1), indicates described first switch (Q1) to carry out closed procedure, with photovoltaic arrays described in conducting and the connection between described inverter.
Further, in embodiment of the present invention, when carrying out pretrigger to described inverter and after determining that described inverter is in steady-working state, if closed described first switch (Q1) is with photovoltaic arrays described in conducting and the connection between described inverter, the change in voltage schematic diagram of the photovoltaic arrays then in photovoltaic generating system and inverter can as shown in Figure 5, wherein:
Described first switch (Q1) closed moment, PV voltage (i.e. photovoltaic arrays output voltage) is clamped to the magnitude of voltage identical with described busbar voltage by by the busbar voltage of described inverter.Now, because the output energy (PV energy) of photovoltaic arrays is larger, therefore, photovoltaic arrays can charge to bus capacitor, busbar voltage is climbed rapidly, correspondingly, can the increase sharply input current of inverter of bus controller (or bus regulation loop) is given, makes the also corresponding increase thereupon of the Energy transmission of inverter; When inverter input, export energy equal time, busbar voltage reaches peak, and after this, busbar voltage can fall after rise rapidly, until be returned to initial setting magnitude of voltage, to realize the high voltage startup of inverter.
It should be noted that, in embodiment of the present invention, described first switch (Q1), described second switch (Q2) or described 3rd switch (Q3) can be in the various switches such as transistor, relay or contactor any one, the embodiment of the present invention is not limited in any way this.
Further, in embodiment of the present invention, if described startup control module 12 also can be used for determining that the output voltage of the described photovoltaic arrays that described voltage acquisition module 11 gets is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter, the embodiment of the present invention repeats no more this.
The embodiment of the present invention two provides a kind of inverter startup device, due to can when not increasing any applied load, by the bus capacitor of inverter itself as short-time load by the busbar voltage clamper of inverter in the permission operating voltage range of inverter, and pass through the mode of the connection described in conducting between photovoltaic arrays and described inverter, closed photovoltaic arrays is to the bus capacitor of inverter, to pass through inverter rapidly by the Energy transmission of described photovoltaic arrays, thus the output voltage solving the photovoltaic arrays existed at present is greater than the problem that when inverter allows operating voltage, inverter cannot normally start, do not increasing on the basis of system cost, achieve the high voltage startup of inverter.
Embodiment three:
The embodiment of the present invention three provides a kind of inverter startup system, and described inverter startup system is applicable in photovoltaic generating system, and the embodiment of the present invention is not limited in any way this.As shown in Fig. 7 ~ Fig. 9, it is the structural representation of inverter startup system described in the embodiment of the present invention three, described inverter startup system can comprise photovoltaic arrays 21 and inverter 22, also can comprise voltage check device 23 and inverter startup device 24, wherein:
Described voltage check device 23 can be used for the output voltage detecting described photovoltaic arrays 21; Particularly, described voltage check device 23 can be connected with the first output of described photovoltaic arrays 21, the second output and described inverter startup device 24 usually, to detect the output voltage of described photovoltaic arrays 21 in real time, and the output voltage of the described photovoltaic arrays 21 detected is sent to described inverter startup device 24; It should be noted that, described voltage check device 23 can be voltage monitoring instrument common at present or voltage tester etc. usually, and the embodiment of the present invention is not limited in any way this.
Before described inverter startup device 24 is used in and starts described inverter 22, obtain the output voltage of the described photovoltaic arrays 21 that described voltage check device 23 detects, and, the output voltage of the described photovoltaic arrays 21 got if determine is greater than the permission operating voltage of described inverter 22 and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter 22, and by the bus controller in described inverter 22, the busbar voltage of described inverter 22 is maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter, and, after pretrigger is carried out to described inverter 22, if determine, described inverter 22 is in steady-working state, connection then described in conducting between photovoltaic arrays 21 and described inverter 22, the output voltage of described photovoltaic arrays 21 is clamped to busbar voltage by the bus capacitor in described inverter 22, and exported by the energy of described inverter 22 by described photovoltaic arrays 21, complete the high voltage startup of described inverter 22.
It should be noted that, described inverter startup device 24 can be the device such as processor or controller usually, and the embodiment of the present invention is not limited in any way this.
Particularly, as shown in Fig. 7 ~ Fig. 9, described inverter startup system also can comprise the first switch (Q1), described first switch (Q1) is arranged in the first line for the first input end of the first output and described inverter 22 connecting described photovoltaic arrays 21, further, the second output of described photovoltaic arrays 21 is connected by the second line with the second input of described inverter 22; In addition, described inverter 22 can comprise the bus capacitor (C) and the inverted power module etc. for carrying out DC-AC conversion that one end is connected with described first line, the other end is connected with described second line usually, and the embodiment of the present invention does not repeat this.
Correspondingly, described inverter startup device 24 specifically can be used for issuing Closed control instruction to described first switch (Q1), indicates described first switch (Q1) to carry out closed procedure, with the connection between photovoltaic arrays described in conducting 21 and described inverter 22.
Further, as shown in Figure 7, described inverter startup system also can comprise the first soft starting circuit 25, wherein, described first soft starting circuit 25 can comprise the first series circuit be made up of the soft start resistance (R) of connecting successively and second switch (Q2), and one end of described first series circuit is connected with the first output of described photovoltaic arrays 21, the other end is connected with the first input end of described inverter 22.
Correspondingly, before described inverter startup device 24 is specifically used in and starts described inverter 22, the output voltage of the described photovoltaic arrays 21 got if determine is greater than the permission operating voltage of described inverter 22 and is not more than the upper voltage limit value of setting, then issue Closed control instruction to described second switch (Q2), described second switch (Q2) is indicated to carry out closed procedure, to realize the pretrigger to described inverter 22.
Or as shown in Figure 8, described inverter startup system also can comprise the second soft starting circuit 26, wherein:
Described second soft starting circuit 26 comprise with the parallel connection of described inverter 22, the second series circuit of comprising the 3rd switch (Q3) and the alternating current soft starter of connecting successively, wherein, one end of described 3rd switch (Q2) is connected with electrical network (G), the other end is connected with the input of described alternating current soft starter, first output of described alternating current soft starter is connected with the first input end of described inverter 22, and the second output of described alternating current soft starter is connected with the second input of described inverter 22.
Correspondingly, before described inverter startup device 24 is specifically used in and starts described inverter 22, the output voltage of the described photovoltaic arrays 21 got if determine is greater than the permission operating voltage of described inverter 22 and is not more than the upper voltage limit value of setting, then issue Closed control instruction to described 3rd switch (Q3), described 3rd switch (Q3) is indicated to carry out closed procedure, to realize the pretrigger to described inverter 22.
It should be noted that, as shown in Figure 9, also can possess above-mentioned first soft starting circuit 25 and the second soft starting circuit 26 in described inverter startup system simultaneously, but, it should be noted that, when possessing above-mentioned first soft starting circuit 25 and the second soft starting circuit 26 in described inverter startup system simultaneously, described first soft starting circuit 25 and described second soft starting circuit 26 can not start usually simultaneously, namely, at any one time, usually a soft starting circuit is only had to be in starting state, to ensure the normal operation of inverter 22.
It should be noted that in addition, in embodiment of the present invention, described first switch (Q1), described second switch (Q2) or described 3rd switch (Q3) can be in the various switches such as transistor, relay or contactor any one, the embodiment of the present invention is not limited in any way this.
Further, in embodiment of the present invention, when carrying out pretrigger to described inverter 22 and after determining that described inverter 22 is in steady-working state, if closed described first switch (Q1) is with the connection between photovoltaic arrays described in conducting 21 and described inverter 22, then the change in voltage schematic diagram of photovoltaic arrays 21 and inverter 22 can as shown in Figure 5, wherein:
Described first switch (Q1) closed moment, PV voltage (i.e. photovoltaic arrays 21 output voltage) is clamped to the magnitude of voltage identical with described busbar voltage by by the busbar voltage of described inverter 22.Now, because the output energy (PV energy) of photovoltaic arrays 21 is larger, therefore, photovoltaic arrays 21 can charge to bus capacitor, busbar voltage is climbed rapidly, correspondingly, can the increase sharply input current of inverter of bus controller (or bus regulation loop) is given, makes the also corresponding increase thereupon of the Energy transmission of inverter 22; When inverter 22 input, export energy equal time, busbar voltage reaches peak, and after this, busbar voltage can fall after rise rapidly, until be returned to initial setting magnitude of voltage, to realize the high voltage startup of inverter 22.
Further, in embodiment of the present invention, if the output voltage that described inverter startup device 24 also can be used for the described photovoltaic arrays 21 determining to get is not more than the permission operating voltage of described inverter 22 and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays 21 and described inverter 22, start described inverter 22.
It should be noted that, in embodiment of the present invention, described photovoltaic arrays 21, described inverter 22, described first switch (Q1), described first soft starting circuit 25 and the second soft starting circuit 26 etc. are the device be arranged in photovoltaic generating system; It should be noted that in addition, described inverter startup device 24 can be the self-contained unit being different from described photovoltaic generating system, and also can be the integrating device be integrated in described photovoltaic generating system, the embodiment of the present invention is not limited in any way this.
The embodiment of the present invention three provides a kind of inverter startup system, due to can when not increasing any applied load, by the bus capacitor of inverter itself as short-time load by the busbar voltage clamper of inverter in the permission operating voltage range of inverter, and pass through the mode of the connection described in conducting between photovoltaic arrays and described inverter, closed photovoltaic arrays is to the bus capacitor of inverter, to pass through inverter rapidly by the Energy transmission of described photovoltaic arrays, thus the output voltage solving the photovoltaic arrays existed at present is greater than the problem that when inverter allows operating voltage, inverter cannot normally start, do not increasing on the basis of system cost, achieve the high voltage startup of inverter.
It will be understood by those skilled in the art that embodiments of the invention can be provided as method, device (equipment) or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, device (equipment) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (9)
1. an inverter startup method, is applicable to, in photovoltaic generating system, it is characterized in that, comprises:
Before startup inverter, obtain the output voltage of photovoltaic arrays;
The output voltage of the described photovoltaic arrays got if determine is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter; And,
If determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
2. inverter startup method as claimed in claim 1, it is characterized in that, described method also comprises:
The output voltage of the described photovoltaic arrays got if determine is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter.
3. an inverter startup device, is applicable to, in photovoltaic generating system, it is characterized in that, comprises:
Voltage acquisition module, for before startup inverter, obtains the output voltage of photovoltaic arrays;
Start control module, if for determining that the output voltage of the described photovoltaic arrays that described voltage acquisition module gets is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter; And, after pretrigger is carried out to described inverter, if determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
4. inverter startup device as claimed in claim 3, is characterized in that,
Described startup control module, if also for determining that the output voltage of the described photovoltaic arrays that described voltage acquisition module gets is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter.
5. an inverter startup system, is applicable in photovoltaic generating system, comprises photovoltaic arrays and inverter, it is characterized in that, also comprises voltage check device and inverter startup device, wherein:
Described voltage check device, for detecting the output voltage of described photovoltaic arrays;
Described inverter startup device, for before the described inverter of startup, obtain the output voltage of the described photovoltaic arrays that described voltage check device detects, and, the output voltage of the described photovoltaic arrays got if determine is greater than the permission operating voltage of described inverter and is not more than the upper voltage limit value of setting, then pretrigger is carried out to described inverter, and by the bus controller in described inverter, the busbar voltage of described inverter being maintained a setting voltage value, described setting voltage value is not more than the permission operating voltage of described inverter; And, after pretrigger is carried out to described inverter, if determine, described inverter is in steady-working state, then photovoltaic arrays described in conducting and the connection between described inverter, the output voltage of described photovoltaic arrays is clamped to busbar voltage by the bus capacitor in described inverter, and exported by the energy of described inverter by described photovoltaic arrays, complete the high voltage startup of described inverter.
6. inverter startup system as claimed in claim 5, is characterized in that,
Described inverter startup device, if also for determining that the output voltage of the described photovoltaic arrays got is not more than the permission operating voltage of described inverter and is not less than the voltage lower limit value of setting, then by the mode of the connection described in conducting between photovoltaic arrays and described inverter, start described inverter.
7. the inverter startup system as described in claim 5 or 6, it is characterized in that, described inverter startup system also comprises the first switch, described first switch-linear hybrid is in the first line of the first input end of the first output and described inverter for connecting described photovoltaic arrays, further, the second output of described photovoltaic arrays is connected by the second line with the second input of described inverter;
Described inverter startup device, specifically for issuing Closed control instruction to described first switch, indicates described first switch to carry out closed procedure, with photovoltaic arrays described in conducting and the connection between described inverter.
8. the inverter startup system as described in claim 5 or 6, is characterized in that, described inverter startup system also comprises the first soft starting circuit, wherein:
Described first soft starting circuit comprises the first series circuit be made up of the soft start resistance of connecting successively and second switch, and one end of described first series circuit is connected with the first output of described photovoltaic arrays, the other end is connected with the first input end of described inverter;
Described inverter startup device, specifically for issuing Closed control instruction to described second switch, indicates described second switch to carry out closed procedure, to realize the pretrigger to described inverter.
9. the inverter startup system as described in claim 5 or 6, is characterized in that, described inverter startup system also comprises the second soft starting circuit, wherein:
Described second soft starting circuit comprise with described inverter parallel, the second series circuit of comprising the 3rd switch and the alternating current soft starter of connecting successively, wherein, one end of described 3rd switch is connected with electrical network, the other end is connected with the input of described alternating current soft starter, first output of described alternating current soft starter is connected with the first input end of described inverter, and the second output of described alternating current soft starter is connected with the second input of described inverter;
Described inverter startup device, specifically for issuing Closed control instruction to described 3rd switch, indicates described 3rd switch to carry out closed procedure, to realize the pretrigger to described inverter.
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