CN107359792A - A kind of power optimization device and its control method and control device - Google Patents
A kind of power optimization device and its control method and control device Download PDFInfo
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- CN107359792A CN107359792A CN201710811533.1A CN201710811533A CN107359792A CN 107359792 A CN107359792 A CN 107359792A CN 201710811533 A CN201710811533 A CN 201710811533A CN 107359792 A CN107359792 A CN 107359792A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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Abstract
This application discloses a kind of power optimization device and its control method and control device, this method to include：Determine the current mode of operation of power optimization device；Wherein, multiple-working mode is set for power optimization device in advance, the multiple-working mode includes Boost patterns, Buck patterns and direct mode operation；If power optimization device is currently operating in Boost patterns or Buck patterns, the dutycycle of each switching tube in power optimization device is adjusted using MPPT maximum power point tracking algorithm, until when meeting the first preparatory condition, is switched to direct mode operation；If power optimization device is currently operating in direct mode operation, Boost patterns are switched to when meeting the second preparatory condition, Buck patterns are switched to when meeting three preparatory conditions, so as to improve the efficiency of power optimization device.
Description
Technical field
The present invention relates to electric and electronic technical field, more specifically to a kind of power optimization device and its control method
And control device.
Background technology
In photovoltaic generating system, the photovoltaic module of the input side joint independence of multiple power optimization devices, outlet side series connection
Enter dc bus.Power optimization device is used for the MPPT maximum power point tracking function of realizing separate unit photovoltaic module, suitable for power optimization
The main circuit topology of device has bridge-type Buck-Boost circuits, Buck circuits, Boost circuit etc..
With the complication of power optimization device application scenario, the traditional mode of operation of each main circuit topology can not meet mesh
Preceding work requirements.Below, illustrated by taking bridge-type Buck-Boost circuits as an example：
Bridge-type Buck-Boost main circuit topologies are as shown in figure 1, be considered as the level of Buck half-bridges and Boost half-bridges
Connection, specifically：S1 and S2 is the top tube and down tube of Buck half-bridges, and S4 and S3 are the top tube and down tube of Boost half-bridges, and L1 is two halves
The public inductance of bridge.The traditional mode of operation of bridge-type Buck-Boost circuits is that the top tube and down tube of same half-bridge are alternately led
Logical, the top tube and down tube of different half-bridges simultaneously turn on, and its operation principle is：During S1 and S3 is turned on, input voltage is added in electricity
Feel on L1, inductive current rises inductive energy storage；During S2 and S4 is turned on, output voltage is added on inductance L1, under inductive current
Drop inductance releases energy.
This traditional mode of operation is built upon on the basis of each switch periods elder generation energy storage of inductance L1 releases energy again
Realize, inductance L1 ripple current is very big, causes excessive core loss and conduction loss, while the pressure filtered also compared with
Greatly.Further, since S1~S4 each cycles switch once, it is larger to also result in switching loss.It can be seen that bridge-type Buck-
Boost circuit is run under this traditional mode of operation can cause efficiency low, can not meet to require higher to circuit efficiency
Occasion work requirements.
The content of the invention
In view of this, the invention provides a kind of power optimization device and its control method and control device, to improve power
The efficiency of optimizer, scheme are as follows：
A kind of power optimization device control method, including：
Determine the current mode of operation of power optimization device；Wherein, multiple-working mode, institute are set for power optimization device in advance
Stating multiple-working mode includes Boost patterns, Buck patterns and direct mode operation；
If power optimization device is currently operating in Boost patterns or Buck patterns, adjusted using MPPT maximum power point tracking algorithm
The dutycycle of each switching tube in power optimization device is saved, until when meeting the first preparatory condition, is switched to direct mode operation；
If power optimization device is currently operating in direct mode operation, Boost patterns are switched to when meeting the second preparatory condition,
Buck patterns are switched to when meeting three preparatory conditions；
Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；
Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；
Or second preparatory condition includes：A upper mode of operation is Buck patterns, and is currently operating in straight-through mould
Duration under formula exceeds threshold value；
3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；
Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；
Or the 3rd preparatory condition includes：A upper mode of operation is Boost patterns, and is currently operating in straight-through
Duration under pattern exceeds threshold value.
A kind of power optimization device control method, including：
Determine the current mode of operation of power optimization device；Wherein, multiple-working mode, institute are set for power optimization device in advance
Stating multiple-working mode includes Boost patterns and direct mode operation；
If power optimization device is currently operating in Boost patterns, power optimization is adjusted using MPPT maximum power point tracking algorithm
The dutycycle of each switching tube in device, until when meeting the first preparatory condition, it is switched to direct mode operation；
If power optimization device is currently operating in direct mode operation, Boost patterns are switched to when meeting the second preparatory condition；
Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；
Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；
Or second preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
A kind of power optimization device control method, including：
Determine the current mode of operation of power optimization device；Wherein, multiple-working mode, institute are set for power optimization device in advance
Stating multiple-working mode includes Buck patterns and direct mode operation；
If power optimization device is currently operating in Buck patterns, power optimization device is adjusted using MPPT maximum power point tracking algorithm
In each switching tube dutycycle, until meet the first preparatory condition when, be switched to direct mode operation；
If power optimization device is currently operating in direct mode operation, Buck patterns are switched to when meeting three preparatory conditions；
3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；
Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；
Or the 3rd preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
Optionally, for any of the above-described kind of power optimization device control method, another work is switched to from each mode of operation
Before pattern, in addition to：Judge that the duration for being met preparatory condition reaches preset duration, the preparatory condition is from current work
Operation mode is switched to another mode of operation preparatory condition to be met.
A kind of power optimization device control device (hereinafter referred to as device 1), including：
Determining unit, the mode of operation current for determining power optimization device；Wherein, it is more for the setting of power optimization device in advance
Kind mode of operation, the multiple-working mode include Boost patterns, Buck patterns and direct mode operation；
First switch unit, in the case of being currently operating in Boost patterns or Buck patterns in power optimization device, adopt
The dutycycle of each switching tube in power optimization device is adjusted with MPPT maximum power point tracking algorithm, until when meeting the first preparatory condition,
It is switched to direct mode operation；
Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting that second is pre-
If being switched to Boost patterns during condition, Buck patterns are switched to when meeting three preparatory conditions；
Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；
Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；
Or second preparatory condition includes：A upper mode of operation is Buck patterns, and is currently operating in straight-through mould
Duration under formula exceeds threshold value；
3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；
Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；
Or the 3rd preparatory condition includes：A upper mode of operation is Boost patterns, and is currently operating in straight-through
Duration under pattern exceeds threshold value.
Another power optimization device control device (hereinafter referred to as device 2), including：
Determining unit, the mode of operation current for determining power optimization device；Wherein, it is more for the setting of power optimization device in advance
Kind mode of operation, the multiple-working mode include Boost patterns and direct mode operation；
First switch unit, in the case of being currently operating in Boost patterns in power optimization device, using peak power
The dutycycle of each switching tube, until when meeting the first preparatory condition, is switched to straight-through in point track algorithm regulation power optimization device
Pattern；
Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting that second is pre-
If Boost patterns are switched to during condition；
Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；
Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；
Or second preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
Another power optimization device control device (hereinafter referred to as device 3), including：
Determining unit, the mode of operation current for determining power optimization device；Wherein, it is more for the setting of power optimization device in advance
Kind mode of operation, the multiple-working mode include Buck patterns and direct mode operation；
First switch unit, in the case of being currently operating in Buck patterns in power optimization device, using peak power
The dutycycle of each switching tube, until when meeting the first preparatory condition, is switched to straight-through in point track algorithm regulation power optimization device
Pattern；
Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting that the 3rd is pre-
If Buck patterns are switched to during condition；
3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；
Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；
Or the 3rd preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
A kind of power optimization device, the main circuit topology of the power optimization device is bridge-type Buck-Boost circuits, described
Power optimization device includes said apparatus 1.
A kind of power optimization device, the main circuit topology of the power optimization device are Boost circuit, the power optimization device bag
Include said apparatus 2.
A kind of power optimization device, the main circuit topology of the power optimization device are Buck circuits, the power optimization device bag
Include said apparatus 3.
It can be seen from the above technical scheme that the present invention sets multiple-working mode for power optimization device in advance, wherein
The traditional mode of operation efficiency of at least a kind of mode of operation specific power optimizer is high, then compared to power optimization device only work
Make under single traditional working mode, power optimization device switches between multiple-working mode can improve whole efficiency.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of bridge-type Buck-Boost circuit topology figures disclosed in prior art；
Fig. 2 is a kind of power optimization device control method flow chart disclosed in the embodiment of the present invention；
Fig. 3 is VA characteristic curve of the photovoltaic module under different illumination intensity；
Fig. 4 is volt watt linearity curve of the photovoltaic module under different illumination intensity；
Fig. 5 is another power optimization device control method flow chart disclosed in the embodiment of the present invention；
Fig. 6 is another power optimization device control method flow chart disclosed in the embodiment of the present invention；
Fig. 7 is a kind of multi-mode controling device structure diagram disclosed in the embodiment of the present 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 carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 2, the embodiment of the invention discloses a kind of power optimization device control method, including：
Step S01：Determine the current mode of operation of power optimization device；Wherein, a variety of works are set for power optimization device in advance
Operation mode, the multiple-working mode include Buck patterns, boost patterns and direct mode operation, direct mode operation and refer to input and output
Voltage mode of operation equal all the time.If power optimization device is currently operating in Boost patterns or Buck patterns, into step
S02；If power optimization device is currently operating in direct mode operation, into step S03.
Specifically, the embodiment of the present invention is intended to be that power optimization device sets multiple-working mode in advance, wherein at least there is one
The traditional mode of operation efficiency of kind mode of operation specific power optimizer is high, then is only operated in compared to power optimization device single
Traditional working mode under, power optimization device switches between multiple-working mode can improve whole efficiency.
Wherein, to the setting of power optimization device multiple-working mode, the type depending on power optimization device main circuit topology.
Below, so that power optimization device main circuit topology is respectively bridge-type Buck-Boost circuits, Buck circuits, Boost circuit as an example
Illustrate：
1) power optimization device main circuit topology is bridge-type Buck-Boost circuits
Bridge-type Buck-Boost circuits can have three kinds of Buck patterns, boost patterns and direct mode operation work simultaneously
Pattern, only there can also be two kinds of mode of operations of Buck patterns and direct mode operation, only can also have boost patterns and straight-through mould
Two kinds of mode of operations of formula.
As shown in figure 1, bridge-type Buck-Boost circuits are operated in Buck patterns, refer to S1 and S2 alternate conductions, S3 is normal
It is disconnected, S4 normal opens, with the state of the increase reduction S1 and S2 of S1 dutycycles switching frequency.Bridge-type Buck-Boost circuits work
In boost patterns, refer to S1 normal opens, S2 normal offs, S3 and S4 alternate conductions, S3 and S4 switch is reduced with the reduction of S3 dutycycles
The state of frequency.Bridge-type Buck-Boost circuits are operated in direct mode operation, refer to S1 and S4 normal opens, the shape of S2 and S3 normal offs
State.
The mode of operation traditional compared to bridge-type Buck-Boost circuits, under Buck patterns and Boost patterns, each
Inductance L1 participates in energy storage or just while release energy transmitting energy to load in switch periods, reduces electricity to a certain extent
Inducing current ripple, while only have two switching tubes to do switch motion in each switch periods, substantially reduce switching loss；
The loss of direct mode operation lower switch is even more directly reduced to zero.It can be seen that only it is operated in compared to bridge-type Buck-Boost circuits single
Buck-Boost patterns under, it switches between Buck patterns, boost patterns and direct mode operation Three models (or in Buck
Switch between two kinds of mode of operations of pattern and direct mode operation, or cut between two kinds of mode of operations of boost patterns and direct mode operation
Change) whole efficiency can be improved.
2) power optimization device main circuit topology is Buck circuits
Buck circuits have Buck patterns (i.e. the traditional mode of operation of Buck circuits) and direct mode operation (i.e. Buck circuits
The state of upper tube normal open, down tube normal off) two kinds of mode of operations.Certain switching loss under Buck patterns be present in Buck circuits, and
Zero is directly reduced in the loss of direct mode operation lower switch, so, only it is operated in compared to Buck circuits under single Buck patterns, its
Switching can improve whole efficiency between Buck patterns and direct mode operation.
3) power optimization device main circuit topology is Boost circuit
Boost circuit has Boost mode circuits (i.e. the traditional mode of operation of Boost circuit) and direct mode operation is (i.e.
The upper tube normal open of Boost circuit, the state of down tube normal off) two kinds of mode of operations.Boost circuit has one under Boost patterns
Determine switching loss, and zero is directly reduced in the loss of direct mode operation lower switch, so, only it is operated in compared to Boost circuit single
Boost patterns under, it switches between Boost patterns and direct mode operation can improve whole efficiency.
From it is above-mentioned 1)~3), single traditional working mode is only operated in compared to power optimization device, its including
Switching can improve whole efficiency between multiple-working mode including direct mode operation.
Technical scheme shown in Fig. 2 is applied to main circuit topology and is bridge-type Buck-Boost circuits while has Buck moulds
The power optimization device of three kinds of formula, boost patterns and direct mode operation mode of operations.Bridge-type Buck-Boost circuits are in these three works
Switchover policy step S02~step S03 as described below between operation mode.
Step S02：The dutycycle of each switching tube in power optimization device is adjusted using MPPT maximum power point tracking algorithm, until full
During the first preparatory condition of foot, direct mode operation is switched to.
Specifically, under Boost patterns or Buck patterns, power optimization device master is adjusted using MPPT maximum power point tracking algorithm
Used method during the dutycycle of each switching tube, can be climbing method, line-of-sight course or method of derivation etc. in circuit topology, and this is all
Well known technology in the industry, here is omitted.
Under Boost patterns or Buck patterns, opened up using MPPT maximum power point tracking algorithm regulation power optimization device main circuit
The dutycycle of each switching tube in flutterring, can be along with the change of the parameters such as the poor, gain of input and output voltage, so being switched to straight-through mould
Formula the first preparatory condition to be met, can be that the dutycycle for detecting certain switching tube reaches maximum duty cycle or minimum duty
Than or detect that the poor absolute value of input and output voltage is less than and threshold value (such as 1V) or detect that gain is small
In threshold value.In a word, as long as the setting of first preparatory condition can reach very close in power optimization device input and output voltage
When, jump out chopping mode, be switched to the purpose of direct mode operation.
Step S03：Boost patterns are switched to when meeting the second preparatory condition, are switched when meeting three preparatory conditions
To Buck patterns.
Specifically, Fig. 3 shows VA characteristic curve of the photovoltaic module under different illumination intensity, Fig. 4 shows photovoltaic
Volt watt linearity curve of the component under different illumination intensity.From Fig. 3 and Fig. 4, when intensity of illumination strengthens, photovoltaic module
Power, voltage, electric current increase, and when intensity of illumination dies down, power, voltage, the electric current of photovoltaic module reduce.Wherein, work(
Rate and electric current are more sensitive to illumination variation, so analyzing intensity of illumination result of variations according to the power of photovoltaic module or electric current
Much sooner, accurately.
Because the power of photovoltaic module when intensity of illumination strengthens can increase, if so power optimization device is desired strong with illumination
Degree enhancing tracking maximum power point, this power optimization device power output just need to increase, and due to this power optimization device and other
Power optimization device is output series connection, causes this power optimization device output current to change response sluggishness to power output, in sluggishness
It is held essentially constant in time, therefore needs boosted output voltages, i.e., this power optimization device needs to enter Boost patterns.
Same reason, when intensity of illumination dies down, power, voltage, the electric current of photovoltaic module diminish, if power is excellent
Change desired died down with intensity of illumination of device and follow the trail of maximum power point, this power optimization device needs to enter Buck patterns.
As can be seen here, Boost patterns the second preparatory condition to be met is switched to from direct mode operation, can is that power is excellent
Change device input current ascending amount and exceed threshold value beyond threshold value or power optimization device input power ascending amount.From straight-through mould
Formula is switched to Buck patterns the 3rd preparatory condition to be met, can be that power optimization device input current slippage exceeds threshold
Value or power optimization device input power slippage exceed threshold value.
In addition it is also possible to power optimization device is set to jump out direct mode operation by the way of active disturbs, for example, when power is excellent
When the duration that change device is currently operating under direct mode operation exceeds threshold value, direct mode operation can be actively jumped out, and arriving will then jump into
Buck patterns or Boost patterns are then relevant with a upper mode of operation for direct mode operation, specifically：If a upper mode of operation is
Buck patterns, it is due to not find maximum power point under Buck patterns to lead directly to so being just switched to illustrate power optimization device
Pattern, now occur that Buck patterns toggle with direct mode operation and can not find maximum power point if rebound Buck patterns
Phenomenon, so Boost patterns must be jumped into；Same reason, if as soon as upper mode of operation is Boost patterns, jump into Buck
Pattern.
Seen from the above description, the present invention sets Boost patterns, Buck patterns and direct mode operation for power optimization device in advance
Totally three kinds of mode of operations, because the traditional mode of operation efficiency of any of which mode of operation all specific power optimizers is high, institute
To be only operated under single traditional working mode compared to power optimization device, power optimization device is between these three mode of operations
Switching can improve whole efficiency.
Referring to Fig. 5, the embodiment of the invention also discloses another power optimization device control method, including：
Step S01：Determine the current mode of operation of power optimization device；Wherein, a variety of works are set for power optimization device in advance
Operation mode, the multiple-working mode include Boost patterns and direct mode operation.If power optimization device is currently operating in Boost
Pattern, into step S02；If power optimization device is currently operating in direct mode operation, into step S03.
Specifically, from being described above, when power optimization device only has two kinds of Working moulds of Boost patterns and direct mode operation
During formula, the main circuit topology of power optimization device can be bridge-type Buck-Boost circuits or Boost circuit.
Step S02：The dutycycle of each switching tube in power optimization device is adjusted using MPPT maximum power point tracking algorithm, until full
During the first preparatory condition of foot, direct mode operation is switched to.
Step S03：Boost patterns are switched to when meeting the second preparatory condition；
Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；
Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；
Or second preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
From being described above, when intensity of illumination strengthens, power, voltage, the electric current of photovoltaic module become big, if work(
Rate optimizer is wanted to strengthen tracking maximum power point with intensity of illumination, and this power optimization device needs to enter Boost patterns.
Technical scheme shown in Fig. 5 is retaining the traditional mode of operation of power optimization device, that is, the basis of Boost patterns
On, direct mode operation is additionally arranged, because the traditional mode of operation efficiency of direct mode operation specific power optimizer is high, so compared to work(
Rate optimizer is only operated under single traditional working mode, and power optimization device switches between two kinds of mode of operations to be improved
Whole efficiency.
Comparatively speaking, technical scheme shown in Fig. 2 due to can realize direct mode operation, Boost patterns and Buck patterns it
Between switching, so suitable for the larger occasion of input and output voltage excursion；And technical scheme shown in Fig. 5 is due to can only be
Switching between direct mode operation and Boost patterns, therefore suitable for the relatively small occasion of input and output voltage excursion.
Referring to Fig. 6, the embodiment of the invention also discloses another power optimization device control method, including：
Step S01：Determine the current mode of operation of power optimization device；Wherein, a variety of works are set for power optimization device in advance
Operation mode, the multiple-working mode include Buck patterns and direct mode operation；If power optimization device is currently operating in Buck moulds
Formula, into step S02；If power optimization device is currently operating in direct mode operation, step S03.
Specifically, from being described above, when power optimization device only has two kinds of Working moulds of Buck patterns and direct mode operation
During formula, the main circuit topology of power optimization device can be bridge-type Buck-Boost circuits or Buck circuits.
Step S02：The dutycycle of each switching tube in power optimization device is adjusted using MPPT maximum power point tracking algorithm, until full
During the first preparatory condition of foot, direct mode operation is switched to.
Step S03：Buck patterns are switched to when meeting three preparatory conditions；
3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；
Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；
Or the 3rd preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
Specifically, from being described above, when intensity of illumination dies down, power, voltage, the electric current of photovoltaic module become
Small, if power optimization device, which is wanted to die down with intensity of illumination, follows the trail of maximum power point, this power optimization device needs to enter Buck moulds
Formula.
Technical scheme shown in Fig. 6 is retaining the traditional mode of operation of power optimization device, that is, the basis of Boost patterns
On, direct mode operation is additionally arranged, because the traditional mode of operation efficiency of direct mode operation specific power optimizer is high, so compared to work(
Rate optimizer is only operated under single traditional working mode, and power optimization device switches between two kinds of mode of operations to be improved
Whole efficiency.
Comparatively speaking, technical scheme shown in Fig. 2 due to can realize direct mode operation, Boost patterns and Buck patterns it
Between switching, and suitable for the larger occasion of input and output voltage excursion；And technical scheme shown in Fig. 6 is due to can only be straight
Logical switching between pattern and Buck patterns, therefore suitable for the relatively small occasion of input and output voltage excursion.
Finally it should be noted that in technical scheme disclosed in Fig. 2, Fig. 5, Fig. 6, it is switched to separately from each mode of operation
Before one mode of operation, also need to meet annex condition：The duration for judging to be met preparatory condition reaches preset duration, described pre-
If condition is is switched to another mode of operation preparatory condition to be met from current operation mode, to avoid because of power optimization device
Operational factor somewhat shake or sampling error etc. and cause frequent switching mode of operation, in turn result in waveform quality change
Poor or low efficiency situation.In addition, the value size of preset duration when jumping out different working modes in corresponding additional conditions
, can be with identical according to setting is actually needed, can also be different.
For example, a kind of power optimization device control with annex condition is proposed on the basis of technical scheme disclosed in Fig. 2
Method processed, including：If power optimization device is currently operating in Boost patterns or Buck patterns, calculated using MPPT maximum power point tracking
The dutycycle of each switching tube in method regulation power optimization device, until meeting the first preparatory condition and meeting the first preparatory condition
When duration is more than the first preset duration, direct mode operation is switched to；If power optimization device is currently operating in direct mode operation, meeting
When the duration of second preparatory condition and the second preparatory condition of satisfaction is more than the second preset duration, Boost patterns are switched to；If
Power optimization device is currently operating in direct mode operation, is meeting the 3rd preparatory condition and is meeting that the duration of the 3rd preparatory condition exceedes
During three preset durations, Buck patterns are switched to.Wherein, the first preset duration, the second preset duration, the 3rd preset duration take
Being worth size can be with identical, can also be different.
Referring to Fig. 7, the embodiment of the invention also discloses a kind of power optimization device control device (hereinafter referred to as device 1), bag
Include：
Determining unit 100, the mode of operation current for determining power optimization device；Wherein, set in advance for power optimization device
Determine multiple-working mode, the multiple-working mode includes Boost patterns, Buck patterns and direct mode operation；
First switch unit 200, for being currently operating in the situation of Boost patterns or Buck patterns in power optimization device
Under, the dutycycle of each switching tube in power optimization device is adjusted using MPPT maximum power point tracking algorithm, until meeting the first default bar
During part, direct mode operation is switched to；
Second switch unit 300, in the case of being currently operating in direct mode operation in power optimization device, meeting second
Boost patterns are switched to during preparatory condition, Buck patterns are switched to when meeting three preparatory conditions；
Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；
Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；
Or second preparatory condition includes：A upper mode of operation is Buck patterns, and is currently operating in straight-through mould
Duration under formula exceeds threshold value；
3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；
Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；
Or the 3rd preparatory condition includes：A upper mode of operation is Boost patterns, and is currently operating in straight-through
Duration under pattern exceeds threshold value.
In addition, the embodiment of the invention also discloses another power optimization device control device (hereinafter referred to as device 2), bag
Include：
Determining unit, the mode of operation current for determining power optimization device；Wherein, it is more for the setting of power optimization device in advance
Kind mode of operation, the multiple-working mode include Boost patterns and direct mode operation；
First switch unit, in the case of being currently operating in Boost patterns in power optimization device, using peak power
The dutycycle of each switching tube, until when meeting the first preparatory condition, is switched to straight-through in point track algorithm regulation power optimization device
Pattern；
Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting that second is pre-
If Boost patterns are switched to during condition；
Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；
Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；
Or second preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
In addition, the embodiment of the invention also discloses another power optimization device control device (hereinafter referred to as device 3), bag
Include：
Determining unit, the mode of operation current for determining power optimization device；Wherein, it is more for the setting of power optimization device in advance
Kind mode of operation, the multiple-working mode include Buck patterns and direct mode operation；
First switch unit, in the case of being currently operating in Buck patterns in power optimization device, using peak power
The dutycycle of each switching tube, until when meeting the first preparatory condition, is switched to straight-through in point track algorithm regulation power optimization device
Pattern；
Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting that the 3rd is pre-
If Buck patterns are switched to during condition；
3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；
Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；
Or the 3rd preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
Optionally, in any of the above-described kind of power optimization device control device, another Working mould is switched to from each mode of operation
Before formula, also need to meet annex condition：The duration for judging to be met preparatory condition reaches preset duration, and the preparatory condition is
Another mode of operation preparatory condition to be met is switched to from current operation mode.
Any of the above-described kind of power optimization device control device includes processor and memory, above-mentioned determining unit, the first switching
Unit and the second switch unit as program unit storage in memory, by computing device storage in memory upper
Program unit is stated to realize corresponding function.
In addition, the embodiment of the invention also discloses a kind of power optimization device, the main circuit topology of the power optimization device is
Bridge-type Buck-Boost circuits, the power optimization device include said apparatus 1.
In addition, the embodiment of the invention also discloses another power optimization device, the main circuit topology of the power optimization device
For Boost circuit, the power optimization device includes said apparatus 2.
In addition, the embodiment of the invention also discloses another power optimization device, the main circuit topology of the power optimization device
For Buck circuits, the power optimization device includes said apparatus 3.
In summary, the present invention sets multiple-working mode, wherein at least one Working mould for power optimization device in advance
The traditional mode of operation efficiency of formula specific power optimizer is high, then single traditional work is only operated in compared to power optimization device
Under operation mode, power optimization device switches between multiple-working mode can improve whole efficiency.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent most wide scope of features of novelty.
Claims (10)
- A kind of 1. power optimization device control method, it is characterised in that including：Determine the current mode of operation of power optimization device；Wherein, multiple-working mode is set for power optimization device in advance, it is described more Kind mode of operation includes Boost patterns, Buck patterns and direct mode operation；If power optimization device is currently operating in Boost patterns or Buck patterns, work(is adjusted using MPPT maximum power point tracking algorithm The dutycycle of each switching tube in rate optimizer, until when meeting the first preparatory condition, it is switched to direct mode operation；If power optimization device is currently operating in direct mode operation, Boost patterns are switched to when meeting the second preparatory condition, full Buck patterns are switched to during three preparatory condition of foot；Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；Or second preparatory condition includes：A upper mode of operation is Buck patterns, and is currently operating under direct mode operation Duration exceed threshold value；3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；Or the 3rd preparatory condition includes：A upper mode of operation is Boost patterns, and is currently operating in direct mode operation Under duration exceed threshold value.
- A kind of 2. power optimization device control method, it is characterised in that including：Determine the current mode of operation of power optimization device；Wherein, multiple-working mode is set for power optimization device in advance, it is described more Kind mode of operation includes Boost patterns and direct mode operation；If power optimization device is currently operating in Boost patterns, adjusted using MPPT maximum power point tracking algorithm in power optimization device The dutycycle of each switching tube, until when meeting the first preparatory condition, it is switched to direct mode operation；If power optimization device is currently operating in direct mode operation, Boost patterns are switched to when meeting the second preparatory condition；Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；Or second preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
- A kind of 3. power optimization device control method, it is characterised in that including：Determine the current mode of operation of power optimization device；Wherein, multiple-working mode is set for power optimization device in advance, it is described more Kind mode of operation includes Buck patterns and direct mode operation；If power optimization device is currently operating in Buck patterns, adjusted using MPPT maximum power point tracking algorithm each in power optimization device The dutycycle of switching tube, until when meeting the first preparatory condition, it is switched to direct mode operation；If power optimization device is currently operating in direct mode operation, Buck patterns are switched to when meeting three preparatory conditions；3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；Or the 3rd preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
- 4. the power optimization device control method according to any one of claim 1-3, it is characterised in that from each Working mould Formula is switched to before another mode of operation, in addition to：The duration for judging to be met preparatory condition reaches preset duration, described pre- If condition is is switched to another mode of operation preparatory condition to be met from current operation mode.
- A kind of 5. power optimization device control device, it is characterised in that including：Determining unit, the mode of operation current for determining power optimization device；Wherein, a variety of works are set for power optimization device in advance Operation mode, the multiple-working mode include Boost patterns, Buck patterns and direct mode operation；First switch unit, in the case of being currently operating in Boost patterns or Buck patterns in power optimization device, using most The dutycycle of each switching tube in high-power track algorithm regulation power optimization device, until when meeting the first preparatory condition, switching To direct mode operation；Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting the second default bar Boost patterns are switched to during part, Buck patterns are switched to when meeting three preparatory conditions；Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；Or second preparatory condition includes：A upper mode of operation is Buck patterns, and is currently operating under direct mode operation Duration exceed threshold value；3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；Or the 3rd preparatory condition includes：A upper mode of operation is Boost patterns, and is currently operating in direct mode operation Under duration exceed threshold value.
- A kind of 6. power optimization device control device, it is characterised in that including：Determining unit, the mode of operation current for determining power optimization device；Wherein, a variety of works are set for power optimization device in advance Operation mode, the multiple-working mode include Boost patterns and direct mode operation；First switch unit, in the case of being currently operating in Boost patterns in power optimization device, using maximum power point with The dutycycle of each switching tube, until when meeting the first preparatory condition, is switched to direct mode operation in track algorithm regulation power optimization device；Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting the second default bar Boost patterns are switched to during part；Second preparatory condition includes：Power optimization device input current ascending amount exceeds threshold value；Or second preparatory condition includes：Power optimization device input power ascending amount exceeds threshold value；Or second preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
- A kind of 7. power optimization device control device, it is characterised in that including：Determining unit, the mode of operation current for determining power optimization device；Wherein, a variety of works are set for power optimization device in advance Operation mode, the multiple-working mode include Buck patterns and direct mode operation；First switch unit, in the case of being currently operating in Buck patterns in power optimization device, using maximum power point with The dutycycle of each switching tube, until when meeting the first preparatory condition, is switched to direct mode operation in track algorithm regulation power optimization device；Second switch unit, in the case of being currently operating in direct mode operation in power optimization device, meeting the 3rd default article Buck patterns are switched to during part；3rd preparatory condition includes：Power optimization device input current slippage exceeds threshold value；Or the 3rd preparatory condition includes：Power optimization device input power slippage exceeds threshold value；Or the 3rd preparatory condition includes：The duration being currently operating under direct mode operation exceeds threshold value.
- 8. a kind of power optimization device, it is characterised in that the main circuit topology of the power optimization device is bridge-type Buck-Boost Circuit, the power optimization device include the power optimization device control device as any one of claim 5-7.
- 9. a kind of power optimization device, it is characterised in that the main circuit topology of the power optimization device is Boost circuit, the work( Rate optimizer includes power optimization device control device as claimed in claim 6.
- 10. a kind of power optimization device, it is characterised in that the main circuit topology of the power optimization device is Buck circuits, the work( Rate optimizer includes power optimization device control device as claimed in claim 7.
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| CN113489323A (en) * | 2021-06-17 | 2021-10-08 | 连云港杰瑞电子有限公司 | Online real-time efficiency optimization control method and device for four-switch buck-boost converter |
| CN113489323B (en) * | 2021-06-17 | 2022-05-13 | 连云港杰瑞电子有限公司 | Online real-time efficiency optimization control method and device for four-switch buck-boost converter |
| CN116800096A (en) * | 2023-08-24 | 2023-09-22 | 杭州禾迈电力电子股份有限公司 | Control method of power converter, power converter and photovoltaic system |
| CN116800096B (en) * | 2023-08-24 | 2023-12-12 | 杭州禾迈电力电子股份有限公司 | Control method of power converter, power converter and photovoltaic system |
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