CN103227561A - Starting device and starting method of photovoltaic inverter - Google Patents
Starting device and starting method of photovoltaic inverter Download PDFInfo
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- CN103227561A CN103227561A CN2013101277549A CN201310127754A CN103227561A CN 103227561 A CN103227561 A CN 103227561A CN 2013101277549 A CN2013101277549 A CN 2013101277549A CN 201310127754 A CN201310127754 A CN 201310127754A CN 103227561 A CN103227561 A CN 103227561A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
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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
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Abstract
The embodiment of the invention discloses a starting device of a photovoltaic inverter, which comprises a soft starting circuit and a starting-up control module, wherein the soft starting circuit is used for converting an output of a photovoltaic battery array to electric energy storage; and the starting-up control module is used for computing electric energy stored by the soft starting circuit in a preset period, and allows the photovoltaic inverter to start up for operation when the computed electric energy is greater than the preset starting-up electric energy. The invention further provides a starting method of the photovoltaic inverter. With the adoption of the starting device and the starting method, the output power of the photovoltaic battery array can be estimated, and the photovoltaic inverter can be prevented from continuously trying to start up and shut down.
Description
Technical field
The present invention relates to field of photovoltaic power generation, relate in particular to a kind of photovoltaic DC-to-AC converter starting drive and method.
Background technology
Photovoltaic generation is as a kind of main new forms of energy, be widely used in the daily life production, photovoltaic power generation technology general using photovoltaic battery array absorbs solar energy and is direct current with conversion of solar energy, and photovoltaic DC-to-AC converter is converted to alternating current with the direct current of photovoltaic battery array output and offers load then.The voltage-current characteristic of photovoltaic battery array belongs to a kind of very unsettled energy between voltage source and current source, the size of its power output is all very responsive to amblent air temperature, load etc.After the sunrise in morning, intensity of solar radiation strengthens gradually, and the output of photovoltaic battery array also increases thereupon, and after reaching the required power output of photovoltaic DC-to-AC converter work, photovoltaic DC-to-AC converter promptly brings into operation automatically.After entering operation, photovoltaic DC-to-AC converter just at every moment monitors the output of photovoltaic battery array, and the power output that needs only photovoltaic battery array is greater than the required power output of photovoltaic DC-to-AC converter work, and photovoltaic DC-to-AC converter is with regard to continuous service; The power output of photovoltaic battery array is less than the required power output of photovoltaic DC-to-AC converter work up to sunset or when overcast and rainy, and photovoltaic DC-to-AC converter just enters holding state.
At present, the Starting mode of photovoltaic DC-to-AC converter generally all is by the switching on and shutting down that directly constantly make repeated attempts, and when treating that the photovoltaic battery array power output can satisfy the minimum power of photovoltaic DC-to-AC converter operation, photovoltaic DC-to-AC converter could normal operation.After this must the operation by photovoltaic DC-to-AC converter is normal, just might determine the method for photovoltaic battery array peak power output, at photovoltaic battery array power hour (as morning, dusk or rainy weather), do not know the peak power output of photovoltaic battery array, photovoltaic DC-to-AC converter is still constantly attempted switching on and shutting down, will inevitably influence the life-span of photovoltaic DC-to-AC converter itself like this, and electrical network is impacted.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of photovoltaic DC-to-AC converter starting drive and method are provided, and can estimate the power output of photovoltaic battery array, avoids photovoltaic DC-to-AC converter constantly to attempt switching on and shutting down.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of photovoltaic DC-to-AC converter starting drive, comprises soft starting circuit and start control module, and wherein: described soft starting circuit is used for the output of photovoltaic battery array is converted to power storage; Described start control module is used to calculate described soft starting circuit electric energy stored in the Preset Time section; Described start control module during greater than default start electric energy, makes photovoltaic DC-to-AC converter start operation at the electric energy that calculates.
Wherein, described soft starting circuit comprises charging resistor and the electric capacity that is connected on the photovoltaic battery array two ends successively.
Wherein, described start control module comprises:
The voltage sample module, in parallel with described electric capacity, the voltage at the described electric capacity two ends that are used to sample;
Computing module, communicating by letter with described electric capacity sampling module links to each other, and the voltage that is used for the described electric capacity two ends that sample according to described voltage sample module in the Preset Time section calculates the electric energy of described capacitance stores in the described Preset Time section;
Start module, when being used for the electric energy that calculates when described computing module, the photovoltaic DC-to-AC converter start is moved greater than default start electric energy.
Wherein, described soft starting circuit also comprises the charging resistor open switch, is connected between the two ends of described photovoltaic battery array after described charging resistor open switch, described charging resistor and described electric capacity are connected successively.
Wherein, described soft starting circuit also comprises the charging resistor short switch, is connected between the two ends of described photovoltaic battery array after described charging resistor short switch and described electric capacity are connected successively.
Correspondingly, the present invention also provides a kind of photovoltaic DC-to-AC converter startup method, comprising:
The output of photovoltaic battery array is converted to power storage;
Calculate institute's electric energy stored in the Preset Time section, and during greater than default start electric energy, make photovoltaic DC-to-AC converter start operation at the electric energy of described Preset Time section stored.
Wherein, utilize the charging resistor be connected on the photovoltaic battery array two ends successively and electric capacity that the output of described photovoltaic battery array is converted to power storage in described electric capacity.
Wherein, the step of institute's electric energy stored specifically comprises in the described calculating Preset Time section:
The sample voltage at described electric capacity two ends;
The voltage at the described electric capacity two ends that sample in the Preset Time section according to described voltage sample module calculates the electric energy of described capacitance stores in the described Preset Time section.
Implement the embodiment of the invention, has following beneficial effect: be converted to power storage by output with photovoltaic battery array, calculate the electric energy of certain hour stored then, the power output of estimation photovoltaic battery array, can satisfy photovoltaic DC-to-AC converter operation institute in power output and take, start photovoltaic DC-to-AC converter, can prevent the photovoltaic DC-to-AC converter switching on and shutting down that make repeated attempts, prolong the useful life of photovoltaic DC-to-AC converter, and can avoid electrical network is impacted.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the photovoltaic DC-to-AC converter starting drive that provides of preferred embodiment of the present invention;
Fig. 2 is the circuit diagram of the soft starting circuit that provides of preferred embodiment of the present invention;
Fig. 3 is the structural representation of the start control module that provides of preferred embodiment of the present invention;
Fig. 4 is the flow chart of the photovoltaic DC-to-AC converter startup method that provides of preferred embodiment of the present invention;
Fig. 5 is the performance diagram of photovoltaic battery array.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Seeing also Fig. 1, is the structural representation of the photovoltaic DC-to-AC converter starting drive 100 that provides of preferred embodiment of the present invention.Photovoltaic DC-to-AC converter starting drive 100 comprises soft starting circuit 110 and the start control module 120 that links to each other with soft starting circuit 110 communications.Wherein, soft starting circuit 110 is used for the output of photovoltaic battery array is converted to power storage, start control module 120 is used to calculate soft starting circuit 110 electric energy stored in the Preset Time section, this start control module 120 during greater than default start electric energy, makes photovoltaic DC-to-AC converter start operation at the electric energy that calculates.
The photovoltaic DC-to-AC converter starting drive that the embodiment of the invention provides, be converted to power storage by output with photovoltaic battery array, calculate the electric energy of certain hour stored then, the power output of estimation photovoltaic battery array, can satisfy photovoltaic DC-to-AC converter operation institute in power output and take, start photovoltaic DC-to-AC converter, can prevent the photovoltaic DC-to-AC converter switching on and shutting down that make repeated attempts, prolong the useful life of photovoltaic DC-to-AC converter, and can avoid electrical network is impacted.
Seeing also Fig. 2, is the circuit diagram of the soft starting circuit 110 that provides of preferred embodiment of the present invention, and soft starting circuit 110 comprises charging resistor R and the capacitor C that is connected on photovoltaic battery array Us two ends successively.Wherein, the size of charging resistor is not limited to some fixing values, and minimum value can be zero ohm, and the resistance of other any appropriate also can.
Preferably, as shown in Figure 2, soft starting circuit 110 also comprises charging resistor open switch K1, is connected between the two ends of photovoltaic battery array Us after charging resistor open switch K1, charging resistor R and capacitor C are connected successively.When K1 was closed, soft starting circuit 110 started.
Preferably, as shown in Figure 2, soft starting circuit 110 also comprises charging resistor short switch K2, is connected between the two ends of photovoltaic battery array Us after charging resistor short switch K2 and capacitor C are connected successively.After soft start was finished, under the situation of K1 closure, closed again K2 with charging resistor R short circuit, stopped the operation of soft starting circuit 110.
The characteristic curve of photovoltaic battery array Us as shown in Figure 5, when closed K1 and K2, flow through the immediate current Ic=Us/R of charging resistor R and capacitor C, from the characteristic curve of photovoltaic battery array as can be seen, U-T curve when it charges for the RC loop is different with desirable driving source situation, mainly show as within a certain period of time, the capacitor C electric energy stored changes along with the power output size of photovoltaic battery array, that is to say, can represent the variation of photovoltaic battery array power output according to the variation of capacitor C electric energy stored in the certain hour.Therefore, start control module 120 can detect soft starting circuit 110 electric energy stored and judge whether to start photovoltaic DC-to-AC converter according to the size of this electric energy within a certain period of time.But circuit diagram shown in Figure 2 only is used to illustrate, and is not used in restriction.Soft starting circuit shown in Figure 2 only is a preferred embodiment that is easy to realize, in reality is implemented, can also use various suitable soft starting circuit well known to those skilled in the art, for example three-phase anti-parallel thyristor, three-phase thyristor bridge rectification circuit etc., as long as the output of photovoltaic battery array can be converted into power storage, certainly, for the convenience of calculating, soft starting circuit institute electric energy stored preferably is convenient to detect and calculate.
Seeing also Fig. 3, is the structural representation of the start control module 120 that provides of preferred embodiment of the present invention, and start control module 120 comprises:
Voltage sample module 121, in parallel with described electric capacity, the voltage U c at the described electric capacity two ends that are used to sample.Particularly, as shown in Figure 2, closed charging resistor short switch K2, the voltage U c at sampling capacitance C two ends, the voltage U c at the electric capacity two ends that sampling obtains is the output voltage U s of photovoltaic battery array.
Computing module 122, communicating by letter with described electric capacity sampling module links to each other, and the voltage that is used for the described electric capacity two ends that sample according to described voltage sample module in the Preset Time section calculates the electric energy of described capacitance stores in the described Preset Time section.Particularly, calculate t according to following formula
0To t
1The electric weight Q of the capacitance stores in the time period:
Start module 123, when being used for the electric energy that calculates when described computing module, the photovoltaic DC-to-AC converter start is moved greater than default start electric energy.Wherein, different usually, the power of start electric energy correspondence can satisfy the operation demand of photovoltaic DC-to-AC converter to default start electric energy and different according to model, the configuration of photovoltaic DC-to-AC converter, the problem of repeated switching can not occur.
Though start control module 120 shown in Figure 3 is to calculate its electric energy in a period of time stored by the voltage that detects the capacitor C two ends, the present invention is not limited to this.In other embodiments of the invention, also can adopt the mode of other any appropriate to calculate the electric energy of soft starting circuit 110 in a period of time stored, for example by specific software module directly detect the capacitor C electric energy stored, by the electric current that flows through capacitor C being sampled etc.
Seeing also Fig. 4, is the flow chart of the photovoltaic DC-to-AC converter startup method that provides of preferred embodiment of the present invention, and this method comprises:
S400, the output of photovoltaic battery array is converted to power storage.For example, as shown in Figure 2, utilize the charging resistor R be connected on the photovoltaic battery array two ends successively and capacitor C that the output of photovoltaic battery array Us is converted to power storage in capacitor C.
S401, calculate institute's electric energy stored in the Preset Time section,, make photovoltaic DC-to-AC converter start operation when the electric energy of described Preset Time section stored during greater than default start electric energy.For example, as shown in Figure 2, the voltage at sampling capacitance two ends at first; Calculate the electric energy of described capacitance stores in the described Preset Time section then according to the voltage at the described electric capacity two ends that sample in the Preset Time section,, make photovoltaic DC-to-AC converter start operation when the electric energy of described Preset Time section stored during greater than default start electric energy.
The photovoltaic DC-to-AC converter startup method that the embodiment of the invention provides, be converted to power storage by output with photovoltaic battery array, calculate the electric energy of certain hour stored then, the power output of estimation photovoltaic battery array, can satisfy photovoltaic DC-to-AC converter operation institute in power output and take, start photovoltaic DC-to-AC converter, can prevent the photovoltaic DC-to-AC converter switching on and shutting down that make repeated attempts, prolong the useful life of photovoltaic DC-to-AC converter, and can avoid electrical network is impacted.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosed only is a kind of preferred embodiment of the present invention, certainly can not limit the present invention's interest field with this, one of ordinary skill in the art will appreciate that all or part of flow process that realizes the foregoing description, and, still belong to the scope that invention is contained according to the equivalent variations that claim of the present invention is done.
Claims (8)
1. a photovoltaic DC-to-AC converter starting drive is characterized in that, comprises soft starting circuit and start control module, and wherein: described soft starting circuit is used for the output of photovoltaic battery array is converted to power storage; Described start control module is used to calculate described soft starting circuit electric energy stored in the Preset Time section; Described start control module during greater than default start electric energy, makes photovoltaic DC-to-AC converter start operation at the electric energy that calculates.
2. photovoltaic DC-to-AC converter starting drive as claimed in claim 1 is characterized in that, described soft starting circuit comprises charging resistor and the electric capacity that is connected on the photovoltaic battery array two ends successively.
3. photovoltaic DC-to-AC converter starting drive as claimed in claim 2 is characterized in that, described start control module comprises:
The voltage sample module, in parallel with described electric capacity, the voltage at the described electric capacity two ends that are used to sample;
Computing module, communicating by letter with described electric capacity sampling module links to each other, and the voltage that is used for the described electric capacity two ends that sample according to described voltage sample module in the Preset Time section calculates the electric energy of described capacitance stores in the described Preset Time section;
Start module, when being used for the electric energy that calculates when described computing module, the photovoltaic DC-to-AC converter start is moved greater than default start electric energy.
4. as claim 2 or 3 described photovoltaic DC-to-AC converter starting drives, it is characterized in that, described soft starting circuit also comprises the charging resistor open switch, is connected between the two ends of described photovoltaic battery array after described charging resistor open switch, described charging resistor and described electric capacity are connected successively.
5. photovoltaic DC-to-AC converter starting drive as claimed in claim 4, it is characterized in that, described soft starting circuit also comprises the charging resistor short switch, is connected between the two ends of described photovoltaic battery array after described charging resistor short switch and described electric capacity are connected successively.
6. a photovoltaic DC-to-AC converter startup method is characterized in that, comprising:
The output of photovoltaic battery array is converted to power storage;
Calculate institute's electric energy stored in the Preset Time section, and during greater than default start electric energy, make photovoltaic DC-to-AC converter start operation at the electric energy of described Preset Time section stored.
7. photovoltaic DC-to-AC converter startup method as claimed in claim 6 is characterized in that, utilizes the charging resistor be connected on the photovoltaic battery array two ends successively and electric capacity that the output of described photovoltaic battery array is converted to power storage in described electric capacity.
8. photovoltaic DC-to-AC converter startup method as claimed in claim 7 is characterized in that, the step of institute's electric energy stored specifically comprises in the described calculating Preset Time section:
The sample voltage at described electric capacity two ends;
The voltage at the described electric capacity two ends that sample in the Preset Time section according to described voltage sample module calculates the electric energy of described capacitance stores in the described Preset Time section.
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| CN201310127754.9A CN103227561B (en) | 2013-04-12 | 2013-04-12 | Photovoltaic DC-to-AC converter starting drive and method |
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| CN201310127754.9A CN103227561B (en) | 2013-04-12 | 2013-04-12 | Photovoltaic DC-to-AC converter starting drive and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104283412A (en) * | 2014-08-07 | 2015-01-14 | 深圳市汇川技术股份有限公司 | Photovoltaic inverter starting method and system |
| CN104748288A (en) * | 2013-12-26 | 2015-07-01 | 珠海格力电器股份有限公司 | Soft start charging circuit and control method thereof |
| CN104811027A (en) * | 2014-01-26 | 2015-07-29 | 艾默生网络能源有限公司 | Inverter starting method, inverter starting device and inverter starting system |
| CN105529743A (en) * | 2016-02-22 | 2016-04-27 | 珠海格力电器股份有限公司 | Photovoltaic system as well as grid-connection power detection method and device |
| CN111697810A (en) * | 2020-05-20 | 2020-09-22 | 惠州拓邦电气技术有限公司 | Slow start control device and method for high-power inverter |
| CN117096851A (en) * | 2023-07-20 | 2023-11-21 | 上海正泰电源系统有限公司 | Method, device and storage medium for predicting power of string photovoltaic array for inverter |
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| CN104748288A (en) * | 2013-12-26 | 2015-07-01 | 珠海格力电器股份有限公司 | Soft start charging circuit and control method thereof |
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| CN104811027A (en) * | 2014-01-26 | 2015-07-29 | 艾默生网络能源有限公司 | Inverter starting method, inverter starting device and inverter starting system |
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| CN105529743A (en) * | 2016-02-22 | 2016-04-27 | 珠海格力电器股份有限公司 | Photovoltaic system as well as grid-connection power detection method and device |
| CN111697810A (en) * | 2020-05-20 | 2020-09-22 | 惠州拓邦电气技术有限公司 | Slow start control device and method for high-power inverter |
| CN117096851A (en) * | 2023-07-20 | 2023-11-21 | 上海正泰电源系统有限公司 | Method, device and storage medium for predicting power of string photovoltaic array for inverter |
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Effective date of registration: 20160222 Address after: 518101 Guangdong city of Shenzhen province Baoan District no 70 District Liu Xian two road Hongwei Dong Industrial Zone E Applicant after: Shenzhen Inovance Technology Co., Ltd. Applicant after: Suzhou Huichuan Technology Co.,Ltd. Address before: 518101 Guangdong city of Shenzhen province Baoan District no 70 District Liu Xian two road Hongwei Dong Industrial Zone E Applicant before: Shenzhen Inovance Technology Co., Ltd. Applicant before: Suzhou Huichuan Technology Co.,Ltd. Applicant before: Suzhou Monarch Control Technology Co., Ltd. |
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