CN105356511A - Automatic control method and apparatus of photovoltaic power generation system DC side device - Google Patents
Automatic control method and apparatus of photovoltaic power generation system DC side device Download PDFInfo
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- 238000010248 power generation Methods 0.000 title abstract description 8
- 230000000875 corresponding effect Effects 0.000 claims description 31
- 238000011217 control strategy Methods 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
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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
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- 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 invention discloses an automatic control method and apparatus of a photovoltaic power generation system DC side device, wherein the method comprises the step of modulating an electrical parametric signal on a DC/DC input side into a signal that can control the photovoltaic power generation system DC side device to perform corresponding operation if the photovoltaic power generation system DC side device shall be adjusted and controlled when a multistage photovoltaic power generation system is in a standby state. In this way, the fully automated control of the photovoltaic power generation system DC side device is realized, and the cost is low.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly, relate to a kind of autocontrol method and device of photovoltaic generating system DC side equipment.
Background technology
Photovoltaic generating system DC side equipment (as direct current conflux case, photovoltaic junction box, DC power distribution cabinet etc.), photovoltaic module, DC/DC converter, DC/AC converter etc. are the important component parts of multi-stage light photovoltaic generating system, and monitoring and the maintenance of its operating state are most important to the safe and stable operation of multi-stage light photovoltaic generating system.
For realizing the Automatic Control of photovoltaic generating system DC side equipment, photovoltaic generating system DC side equipment is configured with communication module (as Wi-Fi module, RS-485 communication module etc.) usually, but it is too high to realize cost, illustrate: in multi-stage light photovoltaic generating system, each photovoltaic module is configured with all separately the photovoltaic junction box that is used for excising from the photovoltaic group string at this photovoltaic module place and accessing this photovoltaic module, and the control command that described photovoltaic junction box can issue according to host computer when configuration communication module automatically performs corresponding actions; But in a multi-stage light photovoltaic generating system, often there are numerous photovoltaic junction boxes, if each photovoltaic junction box configuration communication module, the significantly increase of multi-stage light photovoltaic generating system hardware cost and construction cost can be caused.
Summary of the invention
In view of this, the invention provides a kind of autocontrol method and device of photovoltaic generating system DC side equipment, to realize the Automatic Control of photovoltaic generating system DC side equipment, and it is low to realize cost.
An autocontrol method for photovoltaic generating system DC side equipment, comprising:
When multi-stage light photovoltaic generating system is in holding state, if desired regulable control is carried out to photovoltaic generating system DC side equipment, then the electric parameter signal madulation of DC/DC converter input side is become can control the signal that described photovoltaic generating system DC side equipment performs corresponding actions.
Wherein, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be time domain charactreristic parameter change according to default rule signal time, the described signal becoming can control described photovoltaic generating system DC side equipment execution corresponding actions by the electric parameter signal madulation of DC/DC converter input side, comprising:
According to predetermined control strategy, chop control is carried out to the switching device in DC/DC converter, the time domain charactreristic parameter of the electric parameter signal of described DC/DC converter input side can be changed according to default rule.
Wherein, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be frequency domain character parameter change according to default rule signal time, the described signal becoming can control described photovoltaic generating system DC side equipment execution corresponding actions by the electric parameter signal madulation of DC/DC converter input side, comprising:
According to predetermined control strategy, chop control is carried out to the switching device in DC/DC converter, the frequency domain character parameter of the electric parameter signal of described DC/DC converter input side can be changed according to default rule.
Alternatively, in the process of signal becoming can control described photovoltaic generating system DC side equipment execution corresponding actions by the electric parameter signal madulation of DC/DC converter input side, described method also comprises: keep DC bus-bar voltage to increase above setting threshold.
Wherein, described maintenance DC bus-bar voltage can not increase above setting threshold, comprising:
The duration adopting restriction to modulate the electric parameter signal of described DC/DC converter input side and/or frequency, utilize energy storage device from extracting energy dc-link capacitance, improve on dc-link capacitance these three kinds of schemes of power consumption in a kind of or several arbitrarily combinations can not increase above setting threshold to keep DC bus-bar voltage.
An automatic control equipment for photovoltaic generating system DC side equipment, comprising:
Judging unit, for when multi-stage light photovoltaic generating system is in holding state, judges whether to satisfy the demand and photovoltaic generating system DC side equipment is carried out to the trigger condition of regulable control;
Chop control unit, for when meeting described trigger condition, becomes can control by the electric parameter signal madulation of DC/DC converter input side the signal that described photovoltaic generating system DC side equipment performs corresponding actions.
Wherein, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be time domain charactreristic parameter change according to default rule signal time, described chop control unit is carry out chop control according to predetermined control strategy to the switching device in DC/DC converter, makes the unit that the time domain charactreristic parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule.
Wherein, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be frequency domain character parameter change according to default rule signal time, described chop control unit is carry out chop control according to predetermined control strategy to the switching device in DC/DC converter, makes the unit that the frequency domain character parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule.
Alternatively, described automatic control equipment also comprises: compression limiter, for keeping DC bus-bar voltage to increase above setting threshold in described chop control cell operation process.
Wherein, described compression limiter be the duration that adopts restriction to modulate the electric parameter signal of described DC/DC converter input side and/or frequency, utilize energy storage device from extracting energy dc-link capacitance, improve on dc-link capacitance these three kinds of schemes of power consumption in a kind of or several arbitrarily combinations to the unit keeping DC bus-bar voltage can not increase above setting threshold.
As can be seen from above-mentioned technical scheme, the present invention accepts the waveform after modulation as control command using the electric parameter signal of DC/DC converter input side, described control command is transferred to photovoltaic generating system DC side equipment by DC power line, make it perform corresponding actions, thus achieve the Automatic Control of photovoltaic generating system DC side equipment.Because above-mentioned modulated process carries out chop control realization to DC/DC converter existing in multi-stage light photovoltaic generating system, and above-mentioned control command is also using existing DC power line in multi-stage light photovoltaic generating system as transmission medium, therefore without the need to additionally increasing hardware cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, 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.
The autocontrol method flow chart of Fig. 1 a kind of photovoltaic generating system DC side equipment disclosed in the embodiment of the present invention;
Fig. 2 is a kind of multi-stage light photovoltaic generating system structural representation disclosed in the embodiment of the present invention;
The time dependent oscillogram of voltage of Fig. 3 a a kind of DC/DC converter input side disclosed in the embodiment of the present invention;
The time dependent oscillogram of electric current of Fig. 3 b a kind of DC/DC converter input side disclosed in the embodiment of the present invention;
The automatic control equipment structural representation of Fig. 4 a kind of photovoltaic generating system DC side equipment disclosed in the embodiment of the present invention;
Fig. 5 is the automatic control equipment structural representation of the embodiment of the present invention another photovoltaic generating system DC side equipment disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, 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 the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, the embodiment of the invention discloses a kind of autocontrol method of photovoltaic generating system DC side equipment, to realize the Automatic Control of photovoltaic generating system DC side equipment, and it is low to realize cost, and the method comprises:
Step 101: when multi-stage light photovoltaic generating system is in holding state, judges whether to need to carry out regulable control to photovoltaic generating system DC side equipment, if desired, enters step 102; Otherwise, return and perform step 101.
Step 102: the electric parameter signal madulation of DC/DC converter input side is become can control the signal that described photovoltaic generating system DC side equipment performs corresponding actions.
Multi-stage light photovoltaic generating system refers to the photovoltaic generating system with at least 1 grade of DC/DC converter and at least 1 grade of DC/AC converter.Fig. 2 shows a kind of existing multi-stage light photovoltaic generating system structural representation, comprising: the DC/AC converter of input termination DC bus, output access electrical network; Be connected on the dc-link capacitance Cbus on DC bus; Be connected on the electric capacity Cpv of PV (photovoltaic, photovoltaic) side; And the DC/DC converter using Cpv as input capacitance, using Cbus as output capacitance.The PV assembly comprised in described multi-stage light photovoltaic generating system, photovoltaic generating system DC side equipment are all positioned at PV side, not shown in Fig. 2.
For convenience of follow-up, the operation principle of technical scheme described in the present embodiment is described in detail, the process that below " the electric parameter signal madulation of DC/DC converter input side will be become can control the signal that described photovoltaic generating system DC side equipment performs corresponding actions ", is called " the chop control pattern " of multi-stage light photovoltaic generating system.
The present embodiment is avoid in the process of the Automatic Control realizing photovoltaic generating system DC side equipment, impact the normal power generation of multi-stage light photovoltaic generating system, (under system standby state, DC/AC converter does not carry out transformation of electrical energy to be therefore only in holding state at multi-stage light photovoltaic generating system; It should be noted that; this holding state can be the lower caused normal Standby of PV side input voltage or power; also can be standby caused by multi-stage light photovoltaic generating system disorderly closedown; also it is standby to be that multi-stage light photovoltaic generating system performs caused by the halt instruction that issues of host computer, does not limit to) time just start described chop control pattern.
Damage when the multi-stage light photovoltaic generating system being in holding state runs into certain photovoltaic module, fire, photovoltaic array wiring is abnormal, direct current input overvoltage, photovoltaic generating system DC side equipment power dissipation is too high, isolated island, PV insulation impedance is abnormal, PV inputs overvoltage etc. to be needed by carrying out regulable control to photovoltaic generating system DC side equipment, recover the safety of multi-stage light photovoltaic generating system, stable, reliably, during the situation of Effec-tive Function, just need to proceed to described chop control mode operation, to complete following task: export corresponding control command to photovoltaic generating system DC side equipment, it is made to perform corresponding actions, thus ensure the safety of multi-stage light photovoltaic generating system, stable, reliably, Effec-tive Function.
Wherein, multi-stage light photovoltaic generating system can using self-inspection to needing to carry out regulable control to photovoltaic generating system DC side equipment, receive indication information that host computer issues or staff starts emergency button etc. as the trigger condition needing to enter described chop control pattern.
Under described chop control pattern, the present embodiment accepts the waveform after modulation as needing the control command exporting to photovoltaic generating system DC side equipment using the electric parameter signal of DC/DC converter input side, its modulated process is specially: when needs export control command to photovoltaic generating system DC side equipment, just according to predetermined control strategy, chop control is carried out to the switching device in DC/DC converter, the electric parameter signal of DC/DC converter DC side can be changed according to default rule, form specific coded message; Described default rule is different, and the coded message obtained is just different, and different coded messages just represents different control commands, thus it is various different to achieve the execution of automatic control light photovoltaic generating system DC side equipment.
Wherein, above-mentioned specific coded message, can be that time domain charactreristic parameter is (as the amplitude of voltage or electric current, relative changing value, change slope, waveform rise time or waveform fall time etc.) signal that changes according to default rule, also can be the signal that frequency domain character parameter (as frequency size) changes according to default rule, that is: above-mentioned modulated process can be carry out chop control according to predetermined control strategy to the switching device in DC/DC converter, make the process that the time domain charactreristic parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule, also can be, according to predetermined control strategy, chop control is carried out to the switching device in DC/DC converter, make the process that the frequency domain character parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule.Wherein, described electric parameter signal can be any one or combinations several arbitrarily in voltage signal, current signal and power signal, does not limit to.
For making technical scheme described in the clearer understanding the present embodiment of those skilled in the art, be illustrated below: the present embodiment can determine the copped wave of duty ratio mode to determine frequency by control DC/DC converter under described chop control pattern, the voltage of the DC/DC converter input side obtained under initial condition, current waveform respectively as shown in Figure 3 a and Figure 3 b shows, wherein, switching frequency is f, cycle ON time is ton, voltage relative changing value is Δ V, electric current relative changing value is Δ I, then in chopping process: can by the amplitude of voltage or electric current, relative changing value, change slope, waveform rise time or waveform fall time change the specific coding information of formation as control command according to preset rules, also the specific coding information of formation can be changed as control command by the length of cycle ON time ton according to preset rules, also can be change the specific coding information of formation as control command with switching frequency f according to preset rules, as the frequecy characteristic of 80Hz detected, or time dependent frequecy characteristic etc., also can be with the number of times of the specific coding information detected in a period of time as control command, as within a period of time, voltage relative changing value Δ V exceedes threshold value 3 times, also can be the combination by above-mentioned several mode, as the frequecy characteristic of 80Hz detected, and voltage relative changing value Δ V exceedes threshold value 3 times within a period of time.
By describing above and can finding out, the present embodiment accepts the waveform after modulation as control command using the electric parameter signal of DC/DC converter input side, described control command is transferred to photovoltaic generating system DC side equipment by DC power line, make it perform corresponding actions, thus achieve full-automatic operation.Because above-mentioned modulated process carries out chop control realization to DC/DC converter existing in multi-stage light photovoltaic generating system, and above-mentioned control command is also using existing DC power line in multi-stage light photovoltaic generating system as transmission medium, therefore without the need to additionally increasing hardware cost.
In addition, can power conversion be carried out and power is sent on DC bus when considering, under described chop control pattern, chop control is carried out to DC/DC converter, if the average power transmitted exceedes the average power that load on DC bus (accessory power supply as DC/AC converter) consumes, DC bus-bar voltage will be made to raise, dc-link capacitance Cbus is caused to puncture until exceed setting threshold, therefore need to take certain pressure limiting measure can not increase above described setting threshold to keep DC bus-bar voltage, as: limit duration that the electric parameter signal of DC/DC converter input side is modulated and/or frequency (namely by shorten the duration modulated and/or reduce the number of times modulated in the unit interval reduce DC/DC converter the power that converts), utilize energy storage device (as starting storage battery charging) from extracting energy dc-link capacitance, power consumption on increase dc-link capacitance is (as started the radiator fan of DC/AC converter, the load device that switching is extra) etc.Described pressure limiting threshold value can be set as the overvoltage protection value lower than dc-link capacitance Cbus, protects to prevent triggered pressure.Certainly, if DC bus-bar voltage still can not be avoided to exceed described setting threshold after starting all pressure limiting measures that multi-stage light photovoltaic generating system configures at present, then for safety, copped wave can only be stopped.
In addition, see Fig. 4, the embodiment of the invention also discloses a kind of automatic control equipment of photovoltaic generating system DC side equipment, to realize the Automatic Control of photovoltaic generating system DC side equipment, and it is low to realize cost, comprising:
Judging unit 401, for when multi-stage light photovoltaic generating system is in holding state, judges whether to satisfy the demand and photovoltaic generating system DC side equipment is carried out to the trigger condition of regulable control;
Chop control unit 402, for when meeting described trigger condition, becomes can control by the electric parameter signal madulation of DC/DC converter input side the signal that described photovoltaic generating system DC side equipment performs corresponding actions.
Wherein, the described signal that can control described photovoltaic generating system DC side equipment execution corresponding actions, it can be the signal that time domain charactreristic parameter changes according to default rule, corresponding, chop control unit 402 is carry out chop control according to predetermined control strategy to the switching device in DC/DC converter, makes the unit that the time domain charactreristic parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule.
Or, the described signal that can control described photovoltaic generating system DC side equipment execution corresponding actions, also can be the signal that frequency domain character parameter changes according to default rule, corresponding, chop control unit 402 is carry out chop control according to predetermined control strategy to the switching device in DC/DC converter, makes the unit that the frequency domain character parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule.
Optionally, see Fig. 5, described automatic control equipment also comprises: can not increase above the compression limiter 403 of setting threshold for keeping DC bus-bar voltage in chop control unit 402 course of work.
Wherein, compression limiter 403 be the duration that adopts restriction to modulate the electric parameter signal of described DC/DC converter input side and/or frequency, utilize energy storage device from extracting energy dc-link capacitance, improve on dc-link capacitance these three kinds of schemes of power consumption in a kind of or several arbitrarily combinations to the unit keeping DC bus-bar voltage can not increase above setting threshold.
In sum, the present invention accepts the waveform after modulation as control command using the electric parameter signal of DC/DC converter input side, described control command is transferred to photovoltaic generating system DC side equipment by DC power line, make it perform corresponding actions, thus achieve the Automatic Control of photovoltaic generating system DC side equipment.Because above-mentioned modulated process carries out chop control realization to DC/DC converter existing in multi-stage light photovoltaic generating system, and above-mentioned control command is also using existing DC power line in multi-stage light photovoltaic generating system as transmission medium, therefore without the need to additionally increasing hardware cost.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the embodiment of the present invention, can realize in other embodiments.Therefore, the embodiment of the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. an autocontrol method for photovoltaic generating system DC side equipment, is characterized in that, comprising:
When multi-stage light photovoltaic generating system is in holding state, if desired regulable control is carried out to photovoltaic generating system DC side equipment, then the electric parameter signal madulation of DC/DC converter input side is become can control the signal that described photovoltaic generating system DC side equipment performs corresponding actions.
2. method according to claim 1, it is characterized in that, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be time domain charactreristic parameter change according to default rule signal time, the described signal becoming can control described photovoltaic generating system DC side equipment execution corresponding actions by the electric parameter signal madulation of DC/DC converter input side, comprising:
According to predetermined control strategy, chop control is carried out to the switching device in DC/DC converter, the time domain charactreristic parameter of the electric parameter signal of described DC/DC converter input side can be changed according to default rule.
3. method according to claim 1, it is characterized in that, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be frequency domain character parameter change according to default rule signal time, the described signal becoming can control described photovoltaic generating system DC side equipment execution corresponding actions by the electric parameter signal madulation of DC/DC converter input side, comprising:
According to predetermined control strategy, chop control is carried out to the switching device in DC/DC converter, the frequency domain character parameter of the electric parameter signal of described DC/DC converter input side can be changed according to default rule.
4. method according to claim 1, it is characterized in that, in the process of signal becoming can control described photovoltaic generating system DC side equipment execution corresponding actions by the electric parameter signal madulation of DC/DC converter input side, described method also comprises: keep DC bus-bar voltage to increase above setting threshold.
5. method according to claim 4, is characterized in that, described maintenance DC bus-bar voltage can not increase above setting threshold, comprising:
The duration adopting restriction to modulate the electric parameter signal of described DC/DC converter input side and/or frequency, utilize energy storage device from extracting energy dc-link capacitance, improve on dc-link capacitance these three kinds of schemes of power consumption in a kind of or several arbitrarily combinations can not increase above setting threshold to keep DC bus-bar voltage.
6. an automatic control equipment for photovoltaic generating system DC side equipment, is characterized in that, comprising:
Judging unit, for when multi-stage light photovoltaic generating system is in holding state, judges whether to satisfy the demand and photovoltaic generating system DC side equipment is carried out to the trigger condition of regulable control;
Chop control unit, for when meeting described trigger condition, becomes can control by the electric parameter signal madulation of DC/DC converter input side the signal that described photovoltaic generating system DC side equipment performs corresponding actions.
7. device according to claim 6, it is characterized in that, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be time domain charactreristic parameter change according to default rule signal time, described chop control unit is carry out chop control according to predetermined control strategy to the switching device in DC/DC converter, makes the unit that the time domain charactreristic parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule.
8. device according to claim 6, it is characterized in that, when described can control described photovoltaic generating system DC side equipment perform the signal of corresponding actions be frequency domain character parameter change according to default rule signal time, described chop control unit is carry out chop control according to predetermined control strategy to the switching device in DC/DC converter, makes the unit that the frequency domain character parameter of the electric parameter signal of described DC/DC converter input side can change according to default rule.
9. device according to claim 6, is characterized in that, also comprises: compression limiter, for keeping DC bus-bar voltage to increase above setting threshold in described chop control cell operation process.
10. device according to claim 9, it is characterized in that, described compression limiter is the duration that adopts restriction to modulate the electric parameter signal of described DC/DC converter input side and/or frequency, utilize energy storage device from extracting energy dc-link capacitance, improve on dc-link capacitance these three kinds of schemes of power consumption in a kind of or several arbitrarily combinations to the unit keeping DC bus-bar voltage can not increase above setting threshold.
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| CN201510897749.5A CN105356511B (en) | 2015-12-04 | 2015-12-04 | A kind of autocontrol method and device of photovoltaic generating system direct current side apparatus |
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| US12081167B2 (en) | 2019-02-14 | 2024-09-03 | Sungrow Power Supply Co., Ltd. | Method for limiting voltage of module, and apparatus and system for applying the same |
| TWI730802B (en) * | 2020-06-05 | 2021-06-11 | 安沛科技股份有限公司 | Control system and method of charging device |
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