CN107276038B - A kind of excess temperature protection method and controller of power optimization device - Google Patents
A kind of excess temperature protection method and controller of power optimization device Download PDFInfo
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- CN107276038B CN107276038B CN201710637360.6A CN201710637360A CN107276038B CN 107276038 B CN107276038 B CN 107276038B CN 201710637360 A CN201710637360 A CN 201710637360A CN 107276038 B CN107276038 B CN 107276038B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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Abstract
The present invention provides the excess temperature protection method and controller of a kind of power optimization device; invariable overheat protector threshold value in being different from the prior art; working conditions different according to power optimization device first; corresponding overheat protector threshold value is set for it; and when the temperature of power optimization device is more than the overheat protector threshold value, corresponding overheat protector movement is just triggered；So that in the photovoltaic generating system that the power optimization device of N number of BUCK-BOOST type forms, it is only necessary to a temperature sensor be arranged for each power optimization device, reduce the temperature sensor of half quantity compared with prior art；And in the photovoltaic generating system of the power optimization device composition of M BUCK type, only need to be less than for whole power optimization device settings any S temperature sensor of M, compared with prior art temperature sampling cost can also be reduced with the size of unrestricted choice S and then the quantity of reduction temperature sensor.
Description
Technical field
The present invention relates to power electronics field, in particular to the excess temperature protection method of a kind of power optimization device and control
Device.
Background technique
With advances in technology and development, the development of power optimization device is more and more mature, power optimization device also increasingly by
To the concern of people；Its application system realizes the power of component level as shown in Figure 1, photovoltaic module is directly connected to power optimization device
Optimization, the promotion of the realization generated energy of maximum possible.
In the course of work of power optimization device, in order to avoid power device excess temperature causes power optimization device to shut down, in turn
The stability and reliability of influence system operation, the prior art are generally each power optimization device setting and half-bridge in its topology
The identical temperature sensor of number carries out relevant control using digital control chip, that is, works as detection by corresponding temperature detection
When the big Mr. Yu's threshold value of obtained temperature, overheat protector or power deratng operation are triggered.
But cascade connection type photovoltaic generating system as shown in Figure 1, since its inverter receives the string of multiple power optimization devices
Connection output electric energy, i.e., one drags more power optimization devices, causes the temperature sensor quantity needed in the system of power station grade application larger,
Temperature sampling is at high cost.
Summary of the invention
The present invention provides the excess temperature protection method and controller of a kind of power optimization device, is adopted with solving temperature in the prior art
Sample problem at high cost.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of excess temperature protection method of power optimization device, applied to the controller of power optimization device in photovoltaic generating system,
It include the power optimization device of N number of BUCK-BOOST type being arranged in a one-to-one correspondence and N number of temperature sensing in the photovoltaic generating system
Device, N are positive integer；Alternatively, in the photovoltaic generating system include M BUCK type power optimization device and S temperature sensor,
M is the positive integer greater than 1, and S is the positive integer less than M；The excess temperature protection method of the power optimization device includes:
According to the voltage sample information received, the working condition of power optimization device is determined；
According to the working condition of power optimization device, overheat protector threshold value is set；
Judge whether the temperature for the power optimization device that detection obtains is greater than the overheat protector threshold value；
If the temperature for detecting the obtained power optimization device is greater than the overheat protector threshold value, corresponding excess temperature is executed
Protection act.
Preferably, if power optimization device and N number of temperature in the photovoltaic generating system including N number of BUCK-BOOST type pass
Sensor, the then voltage sample information that the basis receives, determines the working condition of power optimization device, comprising:
According to the voltage sample information received, by the voltage sample information of N number of power optimization device input voltage with
Output voltage is compared；
If input voltage is greater than output voltage, it is determined that corresponding power optimizer works in decompression mode；
If input voltage is less than output voltage, it is determined that corresponding power optimizer works in boost mode.
Preferably, if power optimization device and N number of temperature in the photovoltaic generating system including N number of BUCK-BOOST type pass
Sensor, then the working condition according to power optimization device, sets overheat protector threshold value, comprising:
If power optimization device works in decompression mode, overheat protector of the first threshold as corresponding power optimizer is set
Threshold value；
If power optimization device works in boost mode, overheat protector of the second threshold as corresponding power optimizer is set
Threshold value；
Wherein, described if N number of temperature sensor is arranged in a one-to-one correspondence in the BUCK half-bridge region of N number of power optimization device
First threshold is greater than the second threshold；If N number of temperature sensor is arranged in a one-to-one correspondence the BOOST half in N number of power optimization device
Bridge zone domain, then the first threshold is less than the second threshold.
Preferably, if in the photovoltaic generating system including the power optimization device and S temperature sensor of M BUCK type,
The then voltage sample information that the basis receives, determines the working condition of power optimization device, comprising:
According to the voltage sample information received, by the voltage sample information of M power optimization device input voltage with
Output voltage is compared；
If input voltage is greater than output voltage, it is determined that corresponding power optimizer works in decompression mode.
Preferably, if in the photovoltaic generating system including the power optimization device and S temperature sensor of M BUCK type,
The then working condition according to the power optimization device sets overheat protector threshold value, comprising:
If X power optimization device works in decompression mode, the excess temperature for setting third threshold value as X power optimization device is protected
Protect threshold value；
Wherein, X is positive integer, and the third threshold value increases or reduces in proportion with X.
A kind of controller of power optimization device is applied to photovoltaic generating system, includes one by one in the photovoltaic generating system
The power optimization device and N number of temperature sensor for the N number of BUCK-BOOST type being correspondingly arranged, N is positive integer；Alternatively, the photovoltaic
It include the power optimization device and S temperature sensor of M BUCK type in electricity generation system, M is the positive integer greater than 1, and S is less than M
Positive integer；The controller of the power optimization device includes:
Status determining unit, for determining the working condition of power optimization device according to the voltage sample information received；
Threshold setting unit sets overheat protector threshold value for the working condition according to power optimization device；
Judging unit, for judging whether the temperature for detecting obtained power optimization device is greater than the overheat protector threshold value；
Over-temperature protection unit, if the temperature for detecting obtained power optimization device is greater than the overheat protector threshold value,
Execute corresponding overheat protector movement.
Preferably, if power optimization device and N number of temperature in the photovoltaic generating system including N number of BUCK-BOOST type pass
Sensor, then the status determining unit include:
First comparison module, for the voltage sample information that basis receives, by the voltage sample of corresponding power optimizer
Input voltage in information is compared with output voltage；
First determining module, if being greater than output voltage for input voltage, it is determined that corresponding power optimizer works in drop
Die pressing type；If input voltage is less than output voltage, it is determined that corresponding power optimizer works in boost mode.
Preferably, if power optimization device and N number of temperature in the photovoltaic generating system including N number of BUCK-BOOST type pass
Sensor, then the threshold setting unit is used for the working condition according to power optimization device, specific to use when setting overheat protector threshold value
In:
If power optimization device works in decompression mode, overheat protector of the first threshold as corresponding power optimizer is set
Threshold value；
If power optimization device works in boost mode, overheat protector of the second threshold as corresponding power optimizer is set
Threshold value；
Wherein, described if N number of temperature sensor is arranged in a one-to-one correspondence in the BUCK half-bridge region of N number of power optimization device
First threshold is greater than the second threshold；If N number of temperature sensor is arranged in a one-to-one correspondence the BOOST half in N number of power optimization device
Bridge zone domain, then the first threshold is less than the second threshold.
Preferably, if in the photovoltaic generating system including the power optimization device and a temperature sensor of M BUCK type,
Then the status determining unit includes:
Second comparison module, for according to the voltage sample information received, the voltage sample of M power optimization device to be believed
Input voltage in breath is compared with output voltage；
Second determining module, if being greater than output voltage for input voltage, it is determined that corresponding power optimizer works in drop
Die pressing type.
Preferably, if in the photovoltaic generating system including the power optimization device and S temperature sensor of M BUCK type,
Then the threshold setting unit is used for the working condition according to power optimization device, when setting overheat protector threshold value, is specifically used for:
If X power optimization device works in decompression mode, the excess temperature for setting third threshold value as X power optimization device is protected
Protect threshold value；
Wherein, X is positive integer, and the third threshold value increases or reduces in proportion with X.
The excess temperature protection method of the power optimization device provided by the invention, be different from the prior art in invariable mistake
Temperature protection threshold value, working conditions different according to power optimization device first set corresponding overheat protector threshold value for it, and in function
When the temperature of rate optimizer is more than the overheat protector threshold value, corresponding overheat protector movement is just triggered；So that N number of BUCK-BOOST
In the photovoltaic generating system of the power optimization device composition of type, it is only necessary to which a temperature sensor, which is arranged, for each power optimization device is
Can, reduce the temperature sensor of half quantity compared with prior art；And the photovoltaic hair of the power optimization device composition of M BUCK type
In electric system, it is only necessary to be less than any S temperature sensor of M for whole power optimization device settings, compared with prior art
Temperature sampling cost can also be reduced with the size of unrestricted choice S and then the quantity of reduction temperature sensor.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for the cascade connection type photovoltaic generating system that the prior art provides；
Fig. 2 is the direct current component structural schematic diagram of photovoltaic generating system provided in an embodiment of the present invention；
Fig. 3 is the direct current component structural schematic diagram of photovoltaic generating system provided in an embodiment of the present invention；
Fig. 4 is the direct current component structural schematic diagram of photovoltaic generating system provided in an embodiment of the present invention；
Fig. 5 is the flow chart of the excess temperature protection method of power optimization device provided in an embodiment of the present invention；
Fig. 6 is the flow chart of the excess temperature protection method of power optimization device provided in an embodiment of the present invention；
Fig. 7 is the flow chart of the excess temperature protection method of power optimization device provided in an embodiment of the present invention；
Fig. 8 be another embodiment of the present invention provides power optimization device controller structural schematic diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The present invention provides a kind of excess temperature protection method of power optimization device, at high cost to solve temperature sampling in the prior art
The problem of.
The excess temperature protection method of the power optimization device should applied to the controller of power optimization device in photovoltaic generating system
It include the power optimization device and N number of temperature sensor of the N number of BUCK-BOOST type being arranged in a one-to-one correspondence, N in photovoltaic generating system
For positive integer；When N is 1, the connection relationship of the photovoltaic generating system direct current component may refer to Fig. 2；N is the positive integer greater than 1
When, the connection relationship of the photovoltaic generating system direct current component may refer to Fig. 3.Alternatively, including M BUCK in photovoltaic generating system
The power optimization device and S temperature sensor of type, M are the positive integer greater than 1, and S is the positive integer less than M；Fig. 4 is by taking M=2 as an example
It is shown, at this time S=1；In the case of other, S can take any value for being less than M, such as when M is 22, and S can take 11, and
11 temperature sensors are uniformly arranged between 22 power optimization devices, are not specifically limited herein, its concrete application can be regarded
Depending on environment, within the scope of protection of this application.
Excess temperature protection method referring to Fig. 5, the power optimization device includes:
The voltage sample information that S101, basis receive, determines the working condition of power optimization device；
It is illustrated by taking Fig. 2 as an example, in order to make controller realize its corresponding control function in photovoltaic generating system, in addition to
Except temperature sensor, it is also necessary to which corresponding temperature sampling conditioning unit, the side PV voltage sample conditioning unit, output voltage are set
Conditioning unit, current sample conditioning unit and power device driving unit are sampled, respective function is same as the prior art, this
Place no longer repeats one by one.The controller can be realized using digital control chip, be not specifically limited herein, its tool can be regarded
Depending on body application environment, within the scope of protection of this application.
For Fig. 2 and photovoltaic generating system shown in Fig. 3, it is preferred that referring to Fig. 6, step S101 is specifically included:
The voltage sample information that S211, basis receive, by the input electricity in the voltage sample information of N number of power optimization device
Pressure is compared with output voltage；
If input voltage is greater than output voltage, S212 is thened follow the steps；If input voltage is less than output voltage, step is executed
Rapid S213；
S212, determine that corresponding power optimizer works in decompression mode；
S213, determine that corresponding power optimizer works in boost mode.
Specifically, being carried out in photovoltaic generating system shown in Fig. 2 by the input and output voltage to its power optimization device
It samples and compares, determine which kind of mode the power optimization device works in.In photovoltaic generating system shown in Fig. 3, by each
The input and output voltage of a power optimization device carries out sampling and accordingly compares, and can determine that each power optimization device works in respectively
Which kind of mode.
For photovoltaic generating system shown in Fig. 4, it is preferred that referring to Fig. 7, step S101 is specifically included:
The voltage sample information that S311, basis receive, by the input electricity in the voltage sample information of M power optimization device
Pressure is compared with output voltage；
If input voltage is greater than output voltage, S312 is thened follow the steps；
S312, determine that corresponding power optimizer works in decompression mode.
Specifically, in photovoltaic generating system shown in Fig. 4, by the input and output voltage to each power optimization device into
Row samples and compares, and determines whether each power optimization device works in decompression mode, namely determines that the power of each BUCK type is excellent
Change whether device runs.
S102, according to the working condition of power optimization device, set overheat protector threshold value；
For Fig. 2 and photovoltaic generating system shown in Fig. 3, it is preferred that referring to Fig. 6, step S102 is specifically included:
If power optimization device works in decompression mode, S221 is thened follow the steps；If power optimization device works in boost mode,
Then follow the steps S222；
The overheat protector threshold value of S221, setting first threshold as corresponding power optimizer；
The overheat protector threshold value of S222, setting second threshold as corresponding power optimizer；
Wherein, if N number of temperature sensor is arranged in a one-to-one correspondence in the BUCK half-bridge region of N number of power optimization device, first
Threshold value is greater than second threshold；If N number of temperature sensor is arranged in a one-to-one correspondence in the BOOST half-bridge region of N number of power optimization device,
First threshold is less than second threshold.
Specifically, power optimization device includes a BUCK half-bridge and one in photovoltaic generating system shown in Fig. 2
BOOST half-bridge；Its temperature sensor can be set near the power device S1 and S2 in BUCK half-bridge, i.e. half bridge zone BUCK
Domain；Or its temperature sensor also can be set near the power device S3 and S4 in BOOST half-bridge, i.e. half bridge zone BOOST
Domain.
It is illustrated so that its temperature sensor is set to BUCK half-bridge region as an example: if the power optimization device works in decompression
Mode, then the power device S1 and S2 in its BUCK half-bridge are in HF switch state, the power device S3 in BOOST half-bridge
Perseverance shutdown, the conducting of S4 perseverance；Under the mode, the power device the degree of heat in BUCK half-bridge will be much larger than in BOOST half-bridge
Power device；When the temperature that temperature sensor detects is greater than first threshold, need to trigger overheat protector movement.Similarly,
If the power optimization device works in boost mode, the power device the degree of heat in BOOST half-bridge will be much larger than BUCK half
Power device in bridge；Although temperature sensor is located at BUCK half-bridge region at this time, the power device in BOOST half-bridge is issued
Heat the temperature of the power device in BOOST half-bridge can be made to be transferred to BUCK half-bridge region by conducting and radiate transmitting,
The bulk temperature in BUCK half-bridge region can rise with the increase of the calorific value of the power device in BOOST half-bridge, work as temperature
When the temperature that sensor detects is greater than second threshold, that is, need to trigger overheat protector movement.At this point, the power optimization device
Overheat protector threshold value will no longer be a changeless value, but combine corresponding work according to the setting position of temperature sensor
Operation mode is come the different overheat protector threshold values determined, i.e. first threshold and the second threshold less than first threshold.Specific real
It, can be according to the heat transmission distance of the isolating device in temperature sensor and two half-bridges to first threshold and the in the application of border
Two threshold values are specifically set, and are not specifically limited herein, within the scope of protection of this application.Similarly, temperature sensor is set
The case where being placed in the half-bridge region BOOST is identical as above-mentioned principle, and details are not described herein again.
The power optimization device for dragging more BUCK-BOOST types for shown in Fig. 3 one comes also according to corresponding operating mode
It determines different overheat protector values, does not need to configure a temperature sensor, temperature for each BUCK half-bridge and BOOST half-bridge
The quantity of sensor reduces generally compared with prior art, reduces system temperature sampling cost.
For photovoltaic generating system shown in Fig. 4, it is preferred that referring to Fig. 7, step S102 is specifically included:
If X power optimization device works in decompression mode, the excess temperature for setting third threshold value as X power optimization device is protected
Protect threshold value；
Wherein, X is positive integer, and third threshold value increases or reduces in proportion with X.
For the power optimization device topology of BUCK type, it is only able to achieve decompression, operating mode is single, so for one-to-one
BUCK type power optimization device, it is only necessary to temperature sensor carries out associated temperature control；More BUCK types is dragged for one
Power optimization device, the power optimization device of one drag two BUCK type as shown in Figure 4 can also carry out using temperature sensor
Corresponding temperature sampling, it is clear that overheat protector threshold value when two power optimization devices are run should be greater than a power optimization
Overheat protector threshold value when device is run.When the power optimization device number in system is more, the overheat protector threshold that accordingly sets
Value will increase with it.The power optimization device for dragging more BUCK types for one can be arranged one between every two power optimization device
Temperature sensor only can also carry out corresponding temperature sampling using temperature sensor, greatly reduce system at
This.
S103, judge whether the temperature for the power optimization device that detection obtains is greater than overheat protector threshold value；
If the temperature for detecting obtained power optimization device is greater than overheat protector threshold value, S104 is thened follow the steps；
S104, corresponding overheat protector movement is executed.
Overheat protector movement can be the duty ratio for adjusting power device in corresponding half-bridge, make the defeated of corresponding photovoltaic module
Deviate maximum power point out, and then realizes the drop volume output of power optimization device；It herein and is not specifically limited, the application's
In protection scope.
If the temperature for detecting obtained power optimization device is less than or equal to overheat protector threshold value, corresponding power optimizer is controlled
Continue normal work, corresponding photovoltaic module is made to carry out power output in maximum power point.
The excess temperature protection method of power optimization device provided by the invention, be different from the prior art in invariable excess temperature protect
Threshold value is protected, working conditions different according to power optimization device first sets corresponding overheat protector threshold value for it, and excellent in power
When changing the temperature of device more than the overheat protector threshold value, corresponding overheat protector movement is just triggered；So that N number of BUCK-BOOST type
In the photovoltaic generating system of power optimization device composition, either one-to-one power optimization device or one more power optimization devices are dragged,
It needs that a temperature sensor is arranged for each power optimization device, the temperature for reducing half quantity compared with prior art passes
Sensor；And in the photovoltaic generating system of the power optimization device composition of M BUCK type, it is only necessary to small for whole power optimization device settings
In any S temperature sensor of M, with the size of unrestricted choice S and then temperature sensing can also be reduced compared with prior art
The quantity of device reduces temperature sampling cost.Also, while reducing temperature sensor, be conducive to simplify PCB (Printed
Circuit Board, printed circuit board) layout, conducive to the extensive use of power optimization device.
Another embodiment of the present invention additionally provides a kind of controller of power optimization device, is applied to photovoltaic generating system, should
It include the power optimization device and N number of temperature sensor of the N number of BUCK-BOOST type being arranged in a one-to-one correspondence, N in photovoltaic generating system
For positive integer；When N is 1, the connection relationship of the photovoltaic generating system direct current component may refer to Fig. 2；N is the positive integer greater than 1
When, the connection relationship of the photovoltaic generating system direct current component may refer to Fig. 3.Alternatively, including M BUCK in photovoltaic generating system
The power optimization device and S temperature sensor of type, M are the positive integer greater than 1, and S is the positive integer less than M；Fig. 4 is by taking M=2 as an example
It is shown, at this time S=1；In the case of other, S can take any value for being less than M, such as when M is 22, and S can take 11, and
11 temperature sensors are uniformly arranged between 22 power optimization devices, are not specifically limited herein, its concrete application can be regarded
Depending on environment, within the scope of protection of this application.
The controller of the power optimization device, referring to Fig. 8, comprising:
Status determining unit 101, for determining the work shape of power optimization device according to the voltage sample information received
State；
Threshold setting unit 102 sets overheat protector threshold value for the working condition according to power optimization device；
Judging unit 103, for judging whether the temperature for detecting obtained power optimization device is greater than overheat protector threshold value；
Over-temperature protection unit 104 is held if the temperature for detecting obtained power optimization device is greater than overheat protector threshold value
The corresponding overheat protector movement of row.
For Fig. 2 or photovoltaic generating system shown in Fig. 3, it is preferred that status determining unit 101 includes:
First comparison module, for according to the voltage sample information received, the voltage sample of N number of power optimization device to be believed
Input voltage in breath is compared with output voltage；
First determining module, if being greater than output voltage for input voltage, it is determined that corresponding power optimizer works in drop
Die pressing type；If input voltage is less than output voltage, it is determined that corresponding power optimizer works in boost mode.
Preferably, threshold setting unit 102 is used for the working condition according to power optimization device, sets overheat protector threshold value
When, it is specifically used for:
If power optimization device works in decompression mode, overheat protector of the first threshold as corresponding power optimizer is set
Threshold value；
If power optimization device works in boost mode, overheat protector of the second threshold as corresponding power optimizer is set
Threshold value；
Wherein, if N number of temperature sensor is arranged in a one-to-one correspondence in the BUCK half-bridge region of N number of power optimization device, first
Threshold value is greater than second threshold；If N number of temperature sensor is arranged in a one-to-one correspondence in the BOOST half-bridge region of N number of power optimization device,
First threshold is less than second threshold.
For photovoltaic generating system shown in Fig. 4, it is preferred that status determining unit 101 includes:
Second comparison module, for according to the voltage sample information received, the voltage sample of M power optimization device to be believed
Input voltage in breath is compared with output voltage；
Second determining module, if being greater than output voltage for input voltage, it is determined that corresponding power optimizer works in drop
Die pressing type.
Preferably, threshold setting unit 102 is used for the working condition according to power optimization device, sets overheat protector threshold value
When, it is specifically used for:
If X power optimization device works in decompression mode, the excess temperature for setting third threshold value as X power optimization device is protected
Protect threshold value；
Wherein, X is positive integer, and third threshold value increases or reduces in proportion with X.
Specific working principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. a kind of excess temperature protection method of power optimization device, which is characterized in that be applied to power optimization device in photovoltaic generating system
Controller, include the power optimization device of the N number of BUCK-BOOST type being arranged in a one-to-one correspondence in the photovoltaic generating system and N number of
Temperature sensor, N are positive integer；Alternatively, including the power optimization device and S temperature of M BUCK type in the photovoltaic generating system
Sensor is spent, M is the positive integer greater than 1, and S is the positive integer less than M；The excess temperature protection method of the power optimization device includes:
According to the voltage sample information received, the working condition of power optimization device is determined；
According to the working condition of power optimization device, overheat protector threshold value is set；
Judge whether the temperature for the power optimization device that detection obtains is greater than the overheat protector threshold value；
If the temperature for detecting the obtained power optimization device is greater than the overheat protector threshold value, corresponding overheat protector is executed
Movement.
2. the excess temperature protection method of power optimization device according to claim 1, which is characterized in that if the photovoltaic power generation system
It include the power optimization device and N number of temperature sensor of N number of BUCK-BOOST type, the then voltage sample that the basis receives in system
Information determines the working condition of power optimization device, comprising:
According to the voltage sample information received, by the voltage sample information of N number of power optimization device input voltage and output
Voltage is compared；
If input voltage is greater than output voltage, it is determined that corresponding power optimizer works in decompression mode；
If input voltage is less than output voltage, it is determined that corresponding power optimizer works in boost mode.
3. the excess temperature protection method of power optimization device according to claim 1, which is characterized in that if the photovoltaic power generation system
It include the power optimization device and N number of temperature sensor of N number of BUCK-BOOST type, the then work according to power optimization device in system
State sets overheat protector threshold value, comprising:
If power optimization device works in decompression mode, overheat protector threshold of the first threshold as corresponding power optimizer is set
Value；
If power optimization device works in boost mode, overheat protector threshold of the second threshold as corresponding power optimizer is set
Value；
Wherein, if N number of temperature sensor is arranged in a one-to-one correspondence in the BUCK half-bridge region of N number of power optimization device, described first
Threshold value is greater than the second threshold；If N number of temperature sensor is arranged in a one-to-one correspondence in half bridge zone BOOST of N number of power optimization device
Domain, then the first threshold is less than the second threshold.
4. the excess temperature protection method of power optimization device according to claim 1, which is characterized in that if the photovoltaic power generation system
Including the power optimization device and S temperature sensor of M BUCK type in system, then the voltage sample information that the basis receives,
Determine the working condition of power optimization device, comprising:
According to the voltage sample information received, by the voltage sample information of M power optimization device input voltage and output
Voltage is compared；
If input voltage is greater than output voltage, it is determined that corresponding power optimizer works in decompression mode.
5. the excess temperature protection method of power optimization device according to claim 1, which is characterized in that if the photovoltaic power generation system
It include the power optimization device and S temperature sensor of M BUCK type, then the work shape according to the power optimization device in system
State sets overheat protector threshold value, comprising:
If X power optimization device works in decompression mode, overheat protector threshold of the third threshold value as X power optimization device is set
Value；
Wherein, X is positive integer, and the third threshold value increases or reduces in proportion with X.
6. a kind of controller of power optimization device, which is characterized in that be applied to photovoltaic generating system, in the photovoltaic generating system
Power optimization device and N number of temperature sensor including the N number of BUCK-BOOST type being arranged in a one-to-one correspondence, N is positive integer；Alternatively,
It include the power optimization device and S temperature sensor of M BUCK type in the photovoltaic generating system, M is the positive integer greater than 1, S
For the positive integer less than M；The controller of the power optimization device includes:
Status determining unit, for determining the working condition of power optimization device according to the voltage sample information received；
Threshold setting unit sets overheat protector threshold value for the working condition according to power optimization device；
Judging unit, for judging whether the temperature for detecting obtained power optimization device is greater than the overheat protector threshold value；
Over-temperature protection unit executes if the temperature for detecting obtained power optimization device is greater than the overheat protector threshold value
Corresponding overheat protector movement.
7. the controller of power optimization device according to claim 6, which is characterized in that if being wrapped in the photovoltaic generating system
The power optimization device and N number of temperature sensor of N number of BUCK-BOOST type are included, then the status determining unit includes:
First comparison module, for the voltage sample information that basis receives, by the voltage sample information of corresponding power optimizer
In input voltage be compared with output voltage；
First determining module, if being greater than output voltage for input voltage, it is determined that corresponding power optimizer works in decompression mould
Formula；If input voltage is less than output voltage, it is determined that corresponding power optimizer works in boost mode.
8. the controller of power optimization device according to claim 6, which is characterized in that if being wrapped in the photovoltaic generating system
The power optimization device and N number of temperature sensor of N number of BUCK-BOOST type are included, then the threshold setting unit is used for excellent according to power
Change the working condition of device, when setting overheat protector threshold value, be specifically used for:
If power optimization device works in decompression mode, overheat protector threshold of the first threshold as corresponding power optimizer is set
Value；
If power optimization device works in boost mode, overheat protector threshold of the second threshold as corresponding power optimizer is set
Value；
Wherein, if N number of temperature sensor is arranged in a one-to-one correspondence in the BUCK half-bridge region of N number of power optimization device, described first
Threshold value is greater than the second threshold；If N number of temperature sensor is arranged in a one-to-one correspondence in half bridge zone BOOST of N number of power optimization device
Domain, then the first threshold is less than the second threshold.
9. the controller of power optimization device according to claim 6, which is characterized in that if being wrapped in the photovoltaic generating system
The power optimization device and a temperature sensor of M BUCK type are included, then the status determining unit includes:
Second comparison module will be in the voltage sample information of M power optimization device for the voltage sample information that basis receives
Input voltage be compared with output voltage；
Second determining module, if being greater than output voltage for input voltage, it is determined that corresponding power optimizer works in decompression mould
Formula.
10. the controller of power optimization device according to claim 6, which is characterized in that if in the photovoltaic generating system
Power optimization device and S temperature sensor including M BUCK type, then the threshold setting unit is used for according to power optimization device
Working condition, set overheat protector threshold value when, be specifically used for:
If X power optimization device works in decompression mode, overheat protector threshold of the third threshold value as X power optimization device is set
Value；
Wherein, X is positive integer, and the third threshold value increases or reduces in proportion with X.
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| CN202261101U (en) * | 2011-09-30 | 2012-05-30 | 上海大全赛奥法电气科技有限公司 | Power optimizer and intelligent photovoltaic module |
| CN103490650A (en) * | 2012-06-14 | 2014-01-01 | 江南大学 | Distributed photovoltaic power optimizers and control method |
| CN202872418U (en) * | 2012-10-24 | 2013-04-10 | 神讯电脑(昆山)有限公司 | Solar charger with functions of electric quantity displaying and temperature protection |
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