CN104104311A - Photovoltaic power generation control system - Google Patents
Photovoltaic power generation control system Download PDFInfo
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- CN104104311A CN104104311A CN201410390152.7A CN201410390152A CN104104311A CN 104104311 A CN104104311 A CN 104104311A CN 201410390152 A CN201410390152 A CN 201410390152A CN 104104311 A CN104104311 A CN 104104311A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a photovoltaic power generation control method and system. The photovoltaic power generation control method comprises the following steps of judging whether the interior environmental temperature of a converter is lower than a preset temperature threshold or not and controlling a resistance network which is parallel connection to an output end of a photovoltaic assembly to start consuming energy output from the photovoltaic assembly if yes, wherein the converter comprises an inverter and a direct current converter or the converter only comprises the inverter. According to the photovoltaic power generation control method, the resistance network which is in parallel connection to the output end of the photovoltaic assembly is controlled to work due to detection of the interior environmental temperature of the converter, a resistor generates heat during working, then the interior environmental temperature of the converter gradually rises, and accordingly photovoltaic power generation devices such as the converter can guarantee normal working when the exterior environmental temperature is very low.
Description
Technical field
The present invention relates to a kind of photovoltaic power generation technology field, relate in particular to a kind of photovoltaic power generation control system.
Background technology
In short supply along with world energy sources, now a lot of regions utilize solar power generation, are called again photovoltaic generation.
In solar power system, photovoltaic panel is electric energy by transform light energy.Because the electric energy of photovoltaic panel output is direct current, therefore, need to utilize converter that DC inverter is flowed to electrical network or directly to load, uses for alternating current.
Photovoltaic generating system may be operated in the region that ambient temperature is very low, places such as North America, the arctic.At present, the working temperature of photovoltaic generating system need to remain on subzero more than 25 degrees Celsius, and the part components and parts in the too low system of temperature are by cisco unity malfunction, and machine will quit work.
Because the ambient temperature of system outside is very low, and device not work again, therefore, intrasystem temperature is difficult to be climbed to subzero more than 25 degrees Celsius.Like this, machine will quit work for a long time, therefore can not generate electricity for a long time, and when the low temperature duration is longer like this, user can lose more energy output.
Summary of the invention
The invention provides a kind of photovoltaic power generation control system, can, when converter interior environment temperature is lower, to internal system, heat, cabinet inside ambient temperature is raise, part components and parts reach and recover stable, and converter can be resumed work fast, generate electricity faster to client.
The invention provides a kind of photovoltaic generation control method, comprise the following steps:
Judge that whether converter interior environment temperature is lower than preset temperature threshold value;
If so the resistor network of, controlling the output be connected in parallel on photovoltaic module starts to consume the energy of photovoltaic module output;
Described converter comprises inverter and DC converter, or described converter only comprises inverter.
Preferably, described resistor network comprises at least two resistance;
The resistor network that described control is connected in parallel on the output of photovoltaic module starts to consume the energy of photovoltaic module output, is specially:
When judging converter interior environment temperature lower than the first preset temperature, control the output that all resistance is all connected in parallel on described photovoltaic module, all resistance starts to consume the energy of described photovoltaic module output;
After the first predetermined amount of time of interval, continue judgement converter interior environment temperature, when described converter interior environment temperature is during lower than the second preset temperature, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output;
Described the first preset temperature is less than described the second preset temperature;
Described preset temperature threshold value is more than or equal to described the first preset temperature, and is less than or equal to described the second preset temperature.
Preferably, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; Also comprise the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Judge that whether converter interior environment temperature is lower than described the first preset temperature;
If so, control the first switch closure;
After closed the first predetermined amount of time of the first switch, judge that whether converter interior environment temperature is lower than described the second preset temperature;
If so, control second switch closure.
Preferably, when judging described converter interior environment temperature higher than described preset temperature threshold value, also comprise:
Judge that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value;
If so, control section resistance is connected in parallel on the output of described photovoltaic module, and described part resistance starts to consume the energy of described photovoltaic module output;
After the second predetermined amount of time of interval, whether the output voltage of described photovoltaic module is higher than predeterminated voltage value; When the output voltage of described photovoltaic module is during also higher than described predeterminated voltage value, control the output that residual resistance is connected in parallel on described photovoltaic module, the energy of photovoltaic module output described in all resistance consumptions.
Preferably, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; Also comprise the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Judge that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value;
If so, control the first switch closure;
After closed the second predetermined amount of time of the first switch, whether the output voltage that continues to judge photovoltaic module is also higher than predeterminated voltage value;
If so, control second switch closure.
The embodiment of the present invention provides a kind of photovoltaic power generation control system, comprising: converter, photovoltaic module, controller, temperature sensor;
Described converter, flows to electrical network or load for the direct current of described photovoltaic module output is transformed to alternating current;
Described temperature sensor, for detection of described converter interior environment temperature, and sends to described controller by the converter interior environment temperature of detection;
Described controller, for judging that whether converter interior environment temperature is lower than preset temperature threshold value;
If so the resistor network of, controlling the output be connected in parallel on photovoltaic module starts to consume the energy of photovoltaic module output.
Preferably, described resistor network comprises at least two resistance;
Described controller, for when judgement converter interior environment temperature is worth lower than the first default temperature, controls the output that all resistance is all connected in parallel on described photovoltaic module, and all resistance starts to consume the energy of described photovoltaic module output; After the first predetermined amount of time of interval, continue judgement converter interior environment temperature, when described converter interior environment temperature is during lower than the second preset temperature, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output;
Described the first preset temperature is less than described the second preset temperature;
Described preset temperature threshold value is more than or equal to described the first preset temperature, and is less than or equal to described the second preset temperature.
Preferably, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; This system also comprises the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Described controller, when judging converter interior environment temperature lower than described the first preset temperature, controls the first switch closed; After closed the first predetermined amount of time of the first switch, judge that whether converter interior environment temperature is lower than described the second preset temperature; If so, control second switch closure.
Preferably, also comprise: voltage sensor;
Described voltage sensor, for detection of the output voltage of described photovoltaic module, sends to described controller by the described output voltage detecting;
Described controller, also when judging described converter interior environment temperature higher than described preset temperature threshold value, judges that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value;
If so, control the output that all resistance is all connected in parallel on described photovoltaic module, all resistance starts to consume the energy of described photovoltaic module output;
After the second predetermined amount of time of interval, whether the output voltage of described photovoltaic module is higher than predeterminated voltage value; When described converter interior environment temperature is during also lower than described predeterminated voltage value, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output.
Preferably, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; This system also comprises the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Described controller, during higher than predeterminated voltage value, controls described the first switch closed for the output voltage that judges described photovoltaic module; After closed the first predetermined amount of time of described the first switch, the output voltage that continues to judge photovoltaic module, whether also higher than predeterminated voltage value, if so, is controlled described second switch closed.
Compared with prior art, the present invention has the following advantages:
The method that the present embodiment provides, by detection, convert interior environment temperature, control the resistor network that is connected in parallel on photovoltaic module output and carry out work, while working due to resistance, can produce heat, the ambient temperature of converter inside can raise gradually like this, thereby can make the photovoltaic power generation apparatus such as converter also can guarantee normal work when external environment is very low.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is photovoltaic generation control method embodiment provided by the invention mono-flow chart;
Fig. 2 is photovoltaic generation control method embodiment provided by the invention bis-flow charts;
Fig. 3 is photovoltaic generation control method embodiment provided by the invention tri-flow charts;
Fig. 3 a be photovoltaic generation control method provided by the invention based on system schematic;
Fig. 3 b is the driving signal graph of the first switch provided by the invention and second switch;
Fig. 4 is photovoltaic generation control method embodiment provided by the invention tetra-flow charts;
Fig. 5 is photovoltaic generation control method embodiment provided by the invention five flow charts;
Fig. 6 is photovoltaic power generation control system embodiment mono-schematic diagram provided by the invention;
Fig. 7 is photovoltaic power generation control system embodiment bis-schematic diagrames provided by the invention;
Fig. 8 is photovoltaic power generation control system embodiment tri-schematic diagrames provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Embodiment of the method one:
Referring to Fig. 1, this figure is photovoltaic generation control method embodiment provided by the invention mono-flow chart.
The photovoltaic generation control method that the present embodiment provides, comprises the following steps:
S101: judge that whether converter interior environment temperature is lower than preset temperature threshold value; If so, carry out S102;
It should be noted that, described converter can only comprise inverter, also can not only comprise inverter but also comprise DC-DC converter, comprises DC-DC converter and DC-AC converter.
When converter interior environment temperature being detected lower than preset temperature threshold value, if temperature continues to decline again, comprise that the photovoltaic power generation apparatus of converter is by cisco unity malfunction, for example, preset temperature threshold value can be set to subzero 25 degrees Celsius, during lower than subzero 25 degrees Celsius, need to take heating measure, the ambient temperature of photovoltaic power generation apparatus inside is raise, to guarantee that each device of photovoltaic power generation apparatus inside can normally work.
S102: the resistor network of controlling the output that is connected in parallel on photovoltaic module starts to consume the energy of photovoltaic module output.
It should be noted that, adopt the device of the consumed power that is easy to heat radiation in the embodiment of the present invention, for example resistance can distribute heat when consuming electric energy.In addition, be understandable that, resistor network can be a plurality of series connection or parallel connection, or the network that combines of series and parallel.
It should be noted that, the resistance in described resistor network preferably adopts power resistor, can generate heat quickly during by electric current, and be easy to heat radiation due to power resistor.In addition, in order to make the power resistor distribute heat equably in converter inside rapidly, converter internal temperature is raise quickly, can add radiator around at power resistor, the heat that power resistor sheds is spread in the enclosure interior of converter equably, the temperature fast rise that is conducive to like this converter enclosure interior, thus guarantee that in converter, each device is normally worked.
In addition, for temperature can rise rapidly, preferably radiator and resistance bundle, and are all placed on the bottom of converter enclosure interior, because heat flows from bottom to top.Can make like this heat increase rapidly, thereby fill the housing of whole converter.
The method that the present embodiment provides, by detecting converter interior environment temperature, control the resistor network that is connected in parallel on photovoltaic module output and carry out work, while working due to resistance, can produce heat, the ambient temperature of converter inside can raise gradually like this, thereby can make the photovoltaic power generation apparatus such as converter also can guarantee normal work when external environment is very low.And the method is controlled simple, the hardware device of increase is also few, and cost is low.
Be understandable that, when converter interior environment temperature being detected and be raised to uniform temperature value, can deactivate by controlling resistance network, can avoid like this resistor network to consume too much the power of photovoltaic module output.
Embodiment of the method two:
Referring to Fig. 2, this figure is photovoltaic generation control method embodiment provided by the invention bis-flow charts.
The described resistor network of take in the present embodiment comprises that at least two resistance are introduced as example;
The resistor network that described control is connected in parallel on the output of photovoltaic module starts to consume the energy of photovoltaic module output, is specially:
S201: when judging converter interior environment temperature lower than the first preset temperature Tset1, control the output that all resistance is all connected in parallel on described photovoltaic module, all resistance starts to consume the energy of described photovoltaic module output;
S202: after the first predetermined amount of time of interval, continue judgement converter interior environment temperature, when described converter interior environment temperature is during lower than the second preset temperature Tset2, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output;
Described the first preset temperature Tset1 is less than described the second preset temperature Tset2;
Described preset temperature threshold value Tset is more than or equal to described the first preset temperature Tset1, and is less than or equal to described the second preset temperature Tset2.
For example, Tset1 is subzero 25 degrees Celsius, and Tset2 is subzero 20 degrees Celsius.
In the present embodiment, when converter interior environment temperature is very low, resistance all in resistor network is all accessed to the output of photovoltaic module, can consume to greatest extent like this power of photovoltaic module output, and then can be rapidly heated, converter interior environment temperature is improved.When converter interior environment temperature is elevated to certain value, a part of resistance can be disconnected, remaining resistance also continues access, and then heating, keeps the ambient temperature of converter inside in the scope of normal work.
Embodiment of the method three:
Referring to Fig. 3, this figure is photovoltaic generation control method embodiment provided by the invention tri-flow charts.
The resistor network of take below comprises that two resistance are introduced as example.
Described resistor network comprises two resistance, is respectively the first resistance R 1 and the second resistance R 2; Also comprise the first K switch 1 and second switch K2; Specifically can be referring to Fig. 3 a.
After described the first K switch 1 and the first resistance R 1 series connection, be connected in parallel on the output of photovoltaic module 100; After described second switch K2 and the second resistance R 2 series connection, be connected in parallel on the output of described photovoltaic module 100;
S301: judge that whether converter 200 interior environment temperature are lower than described the first preset temperature Tset1; If so, carry out S302;
Be understandable that, converter interior environment temperature needs temperature sensor to measure, because for converter 200, temperature sensor is indispensable equipment, such as generally all needing detected temperatures to control heat dissipation equipment etc. in inverter.
It should be noted that, R1, K1, R2, K2 and converter 200 are all arranged on same enclosure interior, as shown in the large empty frame in figure.
S302: control the first K switch 1 closure;
S303: judge after closed the first predetermined amount of time of the first K switch 1 that whether converter interior environment temperature is lower than described the second preset temperature Tset2; If so, carry out S304;
S304: control second switch K2 closed.
Be understandable that, while in the present embodiment being the access of resistance, access be R1, can certainly only access R2.This is a relative concept, is not specifically limited.
Described the first switch and second switch can be relay, IGBT or other switching devices.
It should be noted that, described the first predetermined amount of time can be understandable that for the value arranging according to actual needs, and what can arrange is very little, and what also can arrange is larger, can certainly be set to 0.
It should be noted that, the resistance of the first resistance R 1 and the second resistance R 2 also can be selected as required, can be identical resistance, also can, for not identical resistance, at this, be not specifically limited.
When described the first switch and second switch are IGBT, the driving signal of controlling described the first switch and second switch is pulse signal;
The cycle of described pulse signal is T, and the time period of high level is T1, and the low level time period is T2, described T1+T2=T; As shown in Figure 3 b.
Consider that resistance consumption power is large, therefore adopt intermittent open-minded, every the T2 time, open once, duration T 1, as shown in Figure 3 b, T1, the value of T2 depends on power that resistance consumes and heat radiation situation and determines, and during T1, now the voltage of photovoltaic module is added in the two ends of resistance R 1 and/or R2, resistance will consume portion of energy, and giving out heat, converter interior environment temperature will continue to raise, when interior environment temperature being detected higher than Tset, converter can normal power generation move, the driving signal of closing switch K1 and/or K2.
Described the first switch and second switch are closed in the time period at the T1 of each cycle T, at described T2, in the time period, disconnect.
Two resistance of take in the present embodiment are introduced as example, these two resistance are all connected in parallel on the output of photovoltaic module, be understandable that, the electric current that flows through resistance is larger, and the power consuming on it is higher, and heating is also high like this, when converter interior environment temperature is lower, utilize two resistance to generate heat simultaneously, ambient temperature that like this can fast lifting converter inside, thus guarantee that converter can normally work.If the ambient temperature of converter inside is not low especially, can only make a resistance consumption heat improve converter interior environment temperature.
Embodiment of the method four:
Referring to Fig. 4, this figure is photovoltaic generation control method embodiment provided by the invention tetra-flow charts.
The present embodiment has increased the judgement to photovoltaic module output voltage on the basis of embodiment of the method three, and this is in order to solve the problem that photovoltaic module open circuit voltage is too high.
Due in order to improve the conversion efficiency of inverter, the open circuit voltage of photovoltaic module configuration all high than line voltage.But, the regional part line voltage having in reality (North America phase voltage is 277V) higher, the open circuit voltage that wherein many users configure photovoltaic module approaches the maximum working voltage of inverter substantially.
Yet the open circuit voltage of photovoltaic module and photovoltaic module external temperature have compared with Important Relations, under same light is shone, external temperature is higher, and open circuit voltage is lower, and external temperature is lower, and open circuit voltage is higher.
If the open circuit voltage point of the photovoltaic module of configuration approaches the maximum voltage of inverter at normal temperatures, winter photovoltaic module open circuit voltage will surpass the maximum working voltage of inverter, for example the open circuit voltage of normal temperature setting battery plate is 940V, it is even higher that may arrive 1050V winter, now surpass the maximum starting resistor 1000V of inverter, machine cannot start and report fault, yet outdoor temperature is lower, the open circuit voltage short time of cell panel is difficult to return in 1000V, therefore machine can continue the long period and not generate electricity, now user can lose energy output.
Therefore, the application passes through the power of resistance consumption photovoltaic module, and then drags down the output voltage of photovoltaic module, reduces the open circuit voltage of photovoltaic module.
When judging described converter internal temperature higher than described preset temperature threshold value, also comprise:
S401: judge that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value; If so, carry out S402;
S402: control section resistance is connected in parallel on the output of described photovoltaic module, described part resistance starts to consume the energy of described photovoltaic module output;
S403: after the second predetermined amount of time of interval, whether the output voltage of described photovoltaic module is higher than predeterminated voltage value; If so, carry out S404;
S404: control the output that residual resistance is connected in parallel on described photovoltaic module, the energy of photovoltaic module output described in all resistance consumptions.
It should be noted that, described predeterminated voltage value can arrange according to actual needs, for example, be set to 950V.First utilize part resistance to drag down the open circuit voltage of photovoltaic module, during when the output voltage of photovoltaic module or higher than predeterminated voltage value, can continue the open circuit voltage that parallel resistance pulls on low photovoltaic module, until the output voltage of photovoltaic module meets the demands, so just can make inverter generator operation.In the time of like this can be higher at the energy output of photovoltaic module, when open circuit voltage is higher, still can generator operation, thus provide more electric weight for user.
Embodiment of the method five:
Referring to Fig. 5, this figure is photovoltaic generation control method embodiment provided by the invention five flow charts.
The present embodiment is based on embodiment of the method four, and two resistance of take are introduced as example.The present embodiment based on system construction drawing as shown in Figure 3 a.
Described resistor network comprises two resistance, is respectively the first resistance and the second resistance; Also comprise the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
S501: judge that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value; If so, carry out S502;
S502: control the first switch closed;
S503: after closed the second predetermined amount of time of the first switch, whether the output voltage that continues to judge photovoltaic module is also higher than predeterminated voltage value; If so, carry out S504;
S504: control second switch closed.
The output that two resistance of take in the present embodiment are all connected in parallel on photovoltaic module is introduced as example, first closed the first switch, make the first resistance be connected in parallel on the output of photovoltaic module, after each first predetermined amount of time, whether detect output voltage higher than predeterminated voltage value, if higher than, the open circuit voltage that photovoltaic module is described is still too high, need to continue to reduce the open circuit voltage of photovoltaic module, closed second switch more now, make the second resistance also access the output of photovoltaic module, further drag down the open circuit voltage of photovoltaic module.
Be understandable that, in the present embodiment, only take two resistance as example is introduced, the output that a plurality of resistance is connected in parallel on photovoltaic module can be set as required, for example four or five in parallel.
In sum, the method that the above embodiment of the present invention provides not only can improve the ambient temperature of converter inside in low temperature environment, can normally work, and can be higher at the open circuit voltage of photovoltaic module time, drag down the output voltage of photovoltaic module.
A kind of photovoltaic generation control method providing based on above embodiment, also provides a kind of photovoltaic power generation control system, below in conjunction with accompanying drawing, is introduced in detail.
Referring to Fig. 6, this figure is photovoltaic power generation control system embodiment mono-schematic diagram provided by the invention.
The photovoltaic power generation control system that the present embodiment provides, comprising: converter 200, photovoltaic module 100, controller 300, temperature sensor 400;
Described converter 200, flows to electrical network for the direct current of described photovoltaic module 100 outputs is transformed to alternating current;
It should be noted that, described converter can only comprise inverter, also can not only comprise inverter but also comprise DC-DC converter, comprises DC-DC converter and DC-AC converter.
Described temperature sensor 400, for detection of described converter 200 interior environment temperature, and sends to described controller 300 by the temperature of detection;
Described controller 300, for judging that whether converter 200 interior environment temperature are lower than preset temperature threshold value; If so the resistor network 500 of, controlling the output be connected in parallel on photovoltaic module 100 starts to consume the energy of photovoltaic module output.
When converter interior environment temperature being detected lower than preset temperature threshold value, if converter interior environment temperature continues to decline again, comprise that the photovoltaic power generation apparatus of converter is by cisco unity malfunction, for example, preset temperature threshold value can be set to subzero 25 degrees Celsius, during lower than subzero 25 degrees Celsius, need to take heating measure, the ambient temperature of photovoltaic power generation apparatus inside is raise, to guarantee that each device of photovoltaic power generation apparatus inside can normally work.
It should be noted that, adopt the device of the consumed power that is easy to heat radiation in the embodiment of the present invention, for example resistance can distribute heat when consuming electric energy.In addition, be understandable that, resistor network can be a plurality of series connection or parallel connection, or the network that combines of series and parallel.
It should be noted that, the resistance in described resistor network preferably adopts power resistor, can generate heat quickly during by electric current, and be easy to heat radiation due to power resistor.In addition, in order to make the power resistor distribute heat equably in converter inside rapidly, converter internal temperature is raise quickly, can add radiator around at power resistor, the heat that power resistor sheds is spread in the enclosure interior of converter equably, the temperature fast rise that is conducive to like this converter enclosure interior, thus guarantee that in converter, each device is normally worked.
In addition, for temperature can rise rapidly, preferably radiator and resistance bundle, and are all placed on the bottom of converter enclosure interior, because heat flows from bottom to top.Can make like this heat increase rapidly, thereby fill the housing of whole converter.
The system that the present embodiment provides, by detecting converter interior environment temperature, control the resistor network that is connected in parallel on photovoltaic module output and carry out work, while working due to resistance, can consume the power of photovoltaic module output, ohmically electric current is larger, and the heat producing on resistance can be higher, the ambient temperature of converter inside can raise gradually like this, thereby can make the photovoltaic power generation apparatus such as converter also can guarantee normal work when external environment is very low.And this system is controlled simple, the hardware device of increase is also few, and cost is low.
Be understandable that, when converter interior environment temperature being detected and be raised to uniform temperature, can deactivate by controlling resistance network, can avoid like this resistor network to consume too much the power of photovoltaic module output.
System embodiment two:
Referring to Fig. 7, this figure is photovoltaic power generation control system embodiment bis-schematic diagrames provided by the invention.
Be understandable that, described resistor network comprises at least two resistance;
Described controller, for when judgement converter interior environment temperature is worth lower than the first default temperature, controls the output that all resistance is all connected in parallel on described photovoltaic module, and all resistance starts to consume the energy of described photovoltaic module output; After the first predetermined amount of time of interval, continue judgement converter interior environment temperature, when described converter interior environment temperature is during lower than the second preset temperature, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output;
Described the first preset temperature is less than described the second preset temperature;
Described preset temperature threshold value is more than or equal to described the first preset temperature, and is less than or equal to described the second preset temperature.
In the present embodiment, when converter interior environment temperature is very low, resistance all in resistor network is all accessed to the output of photovoltaic module, can consume to greatest extent like this power of photovoltaic module output, and then can be rapidly heated, converter interior environment temperature is improved.When converter interior environment temperature is elevated to certain value, a part of resistance can be disconnected, remaining resistance also continues access, and then heating, keeps the ambient temperature of converter inside in the scope of normal work.
The described resistor network of take in the present embodiment comprises that two resistance are as example is introduced, and is respectively the first resistance R 1 and the second resistance R 2; This system also comprises the first K switch 1 and second switch K2;
After described the first K switch 1 and the first resistance R 1 series connection, be connected in parallel on the output of photovoltaic module 100; After described second switch K2 and the second resistance R 2 series connection, be connected in parallel on the output of described photovoltaic module 100;
Described controller 100, when judging converter 200 interior environment temperature lower than described the first preset temperature, controls the first K switch 1 closure; After closed the first predetermined amount of time of the first K switch 1, judge that whether converter 200 interior environment temperature are lower than described the second preset temperature; If so, control second switch K2 closure.
Two resistance of take in the present embodiment are introduced as example, these two resistance are all connected in parallel on the output of photovoltaic module, be understandable that, the electric current that flows through resistance is larger, and the power consuming on it is higher, and heating is also high like this, when converter interior environment temperature is lower, utilize two resistance to generate heat simultaneously, ambient temperature that like this can fast lifting converter inside, thus guarantee that converter can normally work.If the ambient temperature of converter inside is not low especially, can only make a resistance consumption heat improve converter interior environment temperature.
System embodiment three:
Referring to Fig. 8, this figure is photovoltaic power generation control system embodiment tri-schematic diagrames provided by the invention.
The present embodiment has increased the judgement to photovoltaic module output voltage on the basis of embodiment of the method three, and this is in order to solve the problem that photovoltaic module open circuit voltage is too high.
Due in order to improve the conversion efficiency of inverter, the open circuit voltage of photovoltaic module configuration all high than line voltage.But, the regional part line voltage having in reality (North America phase voltage is 277V) higher, the open circuit voltage that wherein many users configure photovoltaic module approaches the maximum working voltage of inverter substantially.
Yet the open circuit voltage of photovoltaic module and external temperature have compared with Important Relations, under same light is shone, external temperature is higher, and open circuit voltage is lower, and external temperature is lower, and open circuit voltage is higher.
If the open circuit voltage point of the photovoltaic module of configuration approaches the maximum voltage of inverter at normal temperatures, winter photovoltaic module open circuit voltage will surpass the maximum working voltage of inverter, for example the open circuit voltage of normal temperature setting battery plate is 940V, it is even higher that may arrive 1050V winter, now surpass the maximum starting resistor 1000V of inverter, machine cannot start and report fault, yet outdoor temperature is lower, the open circuit voltage short time of cell panel is difficult to return in 1000V, therefore machine can continue the long period and not generate electricity, now user can lose energy output.
Therefore, the application passes through the power of resistance consumption photovoltaic module, and then drags down the output voltage of photovoltaic module, reduces the open circuit voltage of photovoltaic module.
Also comprise: voltage sensor 600;
Described voltage sensor 600, for detection of the output voltage of described photovoltaic module 100, sends to described controller 300 by the described output voltage detecting;
Described controller 300, also when judging described converter 200 interior environment temperature higher than described preset temperature threshold value, judges that whether the output voltage of described photovoltaic module 100 is higher than predeterminated voltage value;
If so, control the output that all resistance is all connected in parallel on described photovoltaic module 100, all resistance starts to consume the energy of described photovoltaic module 100 outputs;
After the second predetermined amount of time of interval, whether the output voltage of described photovoltaic module 100 is higher than predeterminated voltage value; When described converter 200 interior environment temperature are during also lower than described predeterminated voltage value, control section resistance disconnects from the output of described photovoltaic module 100, and only residual resistance consumes the energy of described photovoltaic module 100 outputs.
The resistor network of take below comprises that two resistance are introduced as example:
Described resistor network comprises two resistance, is respectively the first resistance R 1 and the second resistance R 2; This system also comprises the first K switch 1 and second switch K2;
After described the first K switch 1 and the first resistance R 1 series connection, be connected in parallel on the output of photovoltaic module 100; After described second switch K2 and the second resistance R 2 series connection, be connected in parallel on the output of described photovoltaic module 100;
Described controller 300, during higher than predeterminated voltage value, controls described the first K switch 1 closure for the output voltage that judges described photovoltaic module 100; After closed the first predetermined amount of time of described the first K switch 1, the output voltage that continues to judge photovoltaic module 100, whether also higher than predeterminated voltage value, if so, is controlled described second switch K2 closed.
It should be noted that, described the first K switch 1 and second switch K2 can be relay, IGBT or other switching devices.
It should be noted that, described the first predetermined amount of time can be understandable that for the value arranging according to actual needs, and what can arrange is very little, and what also can arrange is larger, can certainly be set to 0.
It should be noted that, the resistance of the first resistance R 1 and the second resistance R 2 also can be selected as required, can be identical resistance, also can, for not identical resistance, at this, be not specifically limited.
When described the first switch and second switch are IGBT, the driving signal of controlling described the first switch and second switch is pulse signal;
It should be noted that, described predeterminated voltage value can arrange according to actual needs, for example, be set to 950V.First utilize part resistance to drag down the open circuit voltage of photovoltaic module, during when the output voltage of photovoltaic module or higher than predeterminated voltage value, can continue the open circuit voltage that parallel resistance pulls on low photovoltaic module, until the output voltage of photovoltaic module meets the demands, so just can make inverter generator operation.In the time of like this can be higher at the energy output of photovoltaic module, when open circuit voltage is higher, still can generator operation, thus provide more electric weight for user.
The output that two resistance of take in the present embodiment are all connected in parallel on photovoltaic module is introduced as example, first closed the first switch, make the first resistance be connected in parallel on the output of photovoltaic module, after each first predetermined amount of time, whether detect output voltage higher than predeterminated voltage value, if higher than, the open circuit voltage that photovoltaic module is described is still too high, need to continue to reduce the open circuit voltage of photovoltaic module, closed second switch more now, make the second resistance also access the output of photovoltaic module, further drag down the open circuit voltage of photovoltaic module.
Be understandable that, in the present embodiment, only take two resistance as example is introduced, the output that a plurality of resistance is connected in parallel on photovoltaic module can be set as required, for example four or five in parallel.
In sum, the system that the above embodiment of the present invention provides not only can improve the ambient temperature of converter inside in low temperature environment, can normally work, and can be higher at the open circuit voltage of photovoltaic module time, drag down the output voltage of photovoltaic module.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (10)
1. a photovoltaic generation control method, is characterized in that, comprises the following steps:
Judge that whether converter interior environment temperature is lower than preset temperature threshold value;
If so the resistor network of, controlling the output be connected in parallel on photovoltaic module starts to consume the energy of photovoltaic module output;
Described converter comprises inverter and DC converter, or described converter only comprises inverter.
2. photovoltaic generation control method according to claim 1, is characterized in that, described resistor network comprises at least two resistance;
The resistor network that described control is connected in parallel on the output of photovoltaic module starts to consume the energy of photovoltaic module output, is specially:
When judging converter interior environment temperature lower than the first preset temperature, control the output that all resistance is all connected in parallel on described photovoltaic module, all resistance starts to consume the energy of described photovoltaic module output;
After the first predetermined amount of time of interval, continue judgement converter interior environment temperature, when described converter interior environment temperature is during lower than the second preset temperature, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output;
Described the first preset temperature is less than described the second preset temperature;
Described preset temperature threshold value is more than or equal to described the first preset temperature, and is less than or equal to described the second preset temperature.
3. photovoltaic generation control method according to claim 2, is characterized in that, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; Also comprise the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Judge that whether converter interior environment temperature is lower than described the first preset temperature;
If so, control the first switch closure;
After closed the first predetermined amount of time of the first switch, judge that whether converter interior environment temperature is lower than described the second preset temperature;
If so, control second switch closure.
4. photovoltaic generation control method according to claim 1, is characterized in that, when judging described converter interior environment temperature higher than described preset temperature threshold value, also comprises:
Judge that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value;
If so, control section resistance is connected in parallel on the output of described photovoltaic module, and described part resistance starts to consume the energy of described photovoltaic module output;
After the second predetermined amount of time of interval, whether the output voltage of described photovoltaic module is higher than predeterminated voltage value; When the output voltage of described photovoltaic module is during also higher than described predeterminated voltage value, control the output that residual resistance is connected in parallel on described photovoltaic module, the energy of photovoltaic module output described in all resistance consumptions.
5. photovoltaic generation control method according to claim 4, is characterized in that, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; Also comprise the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Judge that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value;
If so, control the first switch closure;
After closed the second predetermined amount of time of the first switch, whether the output voltage that continues to judge photovoltaic module is also higher than predeterminated voltage value;
If so, control second switch closure.
6. a photovoltaic power generation control system, is characterized in that, comprising: converter, photovoltaic module, controller, temperature sensor;
Described converter, flows to electrical network or load for the direct current of described photovoltaic module output is transformed to alternating current;
Described temperature sensor, for detection of described converter interior environment temperature, and sends to described controller by the converter interior environment temperature of detection;
Described controller, for judging that whether converter interior environment temperature is lower than preset temperature threshold value;
If so the resistor network of, controlling the output be connected in parallel on photovoltaic module starts to consume the energy of photovoltaic module output.
7. photovoltaic power generation control system according to claim 6, is characterized in that, described resistor network comprises at least two resistance;
Described controller, for when judgement converter interior environment temperature is worth lower than the first default temperature, controls the output that all resistance is all connected in parallel on described photovoltaic module, and all resistance starts to consume the energy of described photovoltaic module output; After the first predetermined amount of time of interval, continue judgement converter interior environment temperature, when described converter interior environment temperature is during lower than the second preset temperature, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output;
Described the first preset temperature is less than described the second preset temperature;
Described preset temperature threshold value is more than or equal to described the first preset temperature, and is less than or equal to described the second preset temperature.
8. photovoltaic power generation control system according to claim 6, is characterized in that, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; This system also comprises the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Described controller, when judging converter interior environment temperature lower than described the first preset temperature, controls the first switch closed; After closed the first predetermined amount of time of the first switch, judge that whether converter interior environment temperature is lower than described the second preset temperature; If so, control second switch closure.
9. photovoltaic power generation control system according to claim 6, is characterized in that, also comprises: voltage sensor;
Described voltage sensor, for detection of the output voltage of described photovoltaic module, sends to described controller by the described output voltage detecting;
Described controller, also when judging described converter interior environment temperature higher than described preset temperature threshold value, judges that whether the output voltage of described photovoltaic module is higher than predeterminated voltage value;
If so, control the output that all resistance is all connected in parallel on described photovoltaic module, all resistance starts to consume the energy of described photovoltaic module output;
After the second predetermined amount of time of interval, whether the output voltage of described photovoltaic module is higher than predeterminated voltage value; When described converter interior environment temperature is during also lower than described predeterminated voltage value, control section resistance disconnects from the output of described photovoltaic module, and only residual resistance consumes the energy of described photovoltaic module output.
10. photovoltaic power generation control system according to claim 9, is characterized in that, described resistor network comprises two resistance, is respectively the first resistance and the second resistance; This system also comprises the first switch and second switch;
After described the first switch and the series connection of the first resistance, be connected in parallel on the output of photovoltaic module; After described second switch and the series connection of the second resistance, be connected in parallel on the output of described photovoltaic module;
Described controller, during higher than predeterminated voltage value, controls described the first switch closed for the output voltage that judges described photovoltaic module; After closed the first predetermined amount of time of described the first switch, the output voltage that continues to judge photovoltaic module, whether also higher than predeterminated voltage value, if so, is controlled described second switch closed.
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