CN103986181B - Photovoltaic generating system and its control method, control device and photovoltaic combining inverter - Google Patents
Photovoltaic generating system and its control method, control device and photovoltaic combining inverter Download PDFInfo
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Abstract
This application discloses a kind of photovoltaic generating system control method, optimal grid-connected voltage before including determining when；By described photovoltaic combining inverter AC voltage-regulation to described currently optimal grid-connected voltage.Under the premise of photovoltaic combining inverter output identical, the application improves the AC voltage of photovoltaic combining inverter to a certain extent, ac-side current is reduced, reduce the energy loss of AC, thus improve the conversion efficiency of photovoltaic combining inverter, and then improve the generated energy of photovoltaic generating system.The application also individually discloses a kind of photovoltaic generating system control device, a kind of photovoltaic combining inverter and a kind of photovoltaic generating system.
Description
Technical field
The application is related to technical field of photovoltaic power generation, more particularly, to a kind of photovoltaic generating system and its control method, control
Device and photovoltaic combining inverter.
Background technology
Adopting grid-connected system the photovoltaic generating system in existing large-sized photovoltaic power station, this system is mainly by photovoltaic group more
Part, photovoltaic combining inverter and booster transformer composition.Wherein, after the unidirectional current that photovoltaic module sends confluxes, by photovoltaic simultaneously
Net inverter is converted to alternating current, may be incorporated into high-voltage fence after the boosted transformer boost of this alternating current.
All there is certain conversion efficiency in the energy conversion in above-mentioned photovoltaic generating system work process, straight/exchange conversion,
Directly affect the generated energy of system.Therefore, it is necessary to take certain technological means to improve above-mentioned conversion efficiency, and then improve photovoltaic
The generated energy of electricity generation system.
Content of the invention
In view of this, the application purpose is to provide a kind of photovoltaic generating system and its control method, control device and light
Volt combining inverter, to meet the demand improving photovoltaic combining inverter conversion efficiency, the generated energy of raising photovoltaic generating system.
For achieving the above object, the application provides following technical scheme：
A kind of photovoltaic generating system control method, described photovoltaic generating system includes photovoltaic module, photovoltaic combining inverter
And booster transformer, methods described includes：
Determine currently optimal grid-connected voltage；
By described photovoltaic combining inverter AC voltage-regulation to described currently optimal grid-connected voltage.
Preferably, described by described AC voltage-regulation to described currently optimal grid-connected voltage, concrete grammar includes：
Determine the optimal no-load voltage ratio of described booster transformer according to described currently optimal grid-connected voltage；
The no-load voltage ratio adjusting described booster transformer is to described optimal no-load voltage ratio.
Preferably, before described determination currently optimal grid-connected voltage, also include：
Determine the different corresponding regulating time of control model and regulation stall；Described control model includes automatic mode and people
Work pattern；
Select one of described control model as present control mode, and according to corresponding regulating time and adjust shelves
Position is controlled to described system.
Preferably, when described present control mode is automatic mode, the no-load voltage ratio of the described booster transformer of described regulation to
Described optimal no-load voltage ratio, including：The no-load voltage ratio of described booster transformer is automatically adjusted to described optimal no-load voltage ratio by on-load voltage regulating device；
When described present control mode is artificial mode, the no-load voltage ratio of the described booster transformer of described regulation to described most preferably
No-load voltage ratio, including：Control no-load tapping switch or on-load voltage regulating device by artificial, to adjust the no-load voltage ratio of described booster transformer to
Described optimal no-load voltage ratio.
Preferably, the described determination corresponding regulating time of automatic mode and regulation stall include：
Calculate maximum variation delta V of the MPP voltage of photovoltaic module described in local one day；Wherein, Δ V=V2-V1, V2
For the maximum of MPP voltage in one day, V1 is the minima of MPP voltage in one day；
Determine that the time point that MPP voltage is V1+i* Δ V/ (n/2+1) is described regulating time；Wherein, n is even number, represents
Daily regulation number of times, i=1,2 ... ..., n/2；
Determine that the corresponding MPP voltage range of k-th regulation stall is [V1+ (k-1) * Δ V/ (n/2+1), V1+k* Δ V/
], and set corresponding optimal grid-connected voltage Vk in this interval (n/2+1)；Wherein, k=1,2 ..., n/2+1；
The described determination corresponding regulating time of artificial mode and regulation stall include：
Calculate maximum variation delta V of the MPP voltage of described photovoltaic module under daily maximum temperature in local a year '；Its
In, Δ V '=V2 '-V1 ', V2 ' they are the maximum of MPP voltage under daily maximum temperature in a year, and V1 ' is daily highest in a year
At a temperature of MPP voltage minima；
Determine that the time point that MPP voltage is V1 '+i ' * Δ V '/(n '/2+1) is described regulating time；Wherein, n ' is even
Number, represents annual regulation number of times, i '=1,2 ... ..., n '/2；
Determining kth ' the corresponding MPP voltage range of individual regulation stall is [V1'+ (k'-1) * Δ V'/(n'/2+1), V1'+
K'* Δ V'/(n'/2+1)], and set corresponding optimal grid-connected voltage Vk in this interval ', wherein, k'=1,2 ..., n'/2+1.
Preferably, currently optimal grid-connected voltage includes for described determination：
When reaching the corresponding regulating time of described present control mode, detect the current MPP voltage of described photovoltaic module；
Described currently optimal grid-connected voltage is determined according to the corresponding regulation stall of described current MPP voltage.
A kind of photovoltaic generating system control device, described photovoltaic generating system includes photovoltaic module, photovoltaic combining inverter
And booster transformer, described control device includes：
Voltage determination module, for determining currently optimal grid-connected voltage；
VRM Voltage Regulator Module, is connected with described voltage determination module, for described photovoltaic combining inverter AC is electric
Pressure is adjusted to described currently optimal grid-connected voltage.
Preferably, described VRM Voltage Regulator Module includes：
No-load voltage ratio determining module, is connected with described voltage determination module, for being determined according to described currently optimal grid-connected voltage
The optimal no-load voltage ratio of described booster transformer；
No-load voltage ratio adjustment module, is connected with described no-load voltage ratio determining module and described booster transformer respectively, described for adjusting
The no-load voltage ratio of booster transformer is to described optimal no-load voltage ratio.
Preferably, described control device also includes：
Mode selection module, is connected with described voltage determination module, during for determining the corresponding regulation of different control models
Between and regulation stall, and select one of described control model as present control mode；Described control model includes automatically
Pattern and artificial mode.
Preferably, described control device also includes mode selection module；
Described mode selection module is connected with described voltage determination module, for determining the corresponding regulation of different control models
Time and regulation stall, and select one of described control model as present control mode；Described control model is included certainly
Dynamic model formula and artificial mode；
Described no-load voltage ratio adjustment module includes：
Self-adjustment module, is connected with described mode selection module, no-load voltage ratio determining module and described booster transformer respectively,
For when the described present control mode that described mode selection module is selected is automatic mode, obtaining described optimal no-load voltage ratio, and
Automatically the no-load voltage ratio of described booster transformer is adjusted to described optimal no-load voltage ratio；
Manual adjustment module, is connected with described mode selection module, no-load voltage ratio determining module and described booster transformer respectively,
For when the described present control mode that described mode selection module is selected is artificial mode, obtaining described optimal no-load voltage ratio, and
Under manual control the no-load voltage ratio of described booster transformer is adjusted to described optimal no-load voltage ratio.
A kind of photovoltaic generating system, including photovoltaic module, photovoltaic combining inverter, booster transformer and any of the above-described
Plant control device.
A kind of photovoltaic combining inverter, is applied to photovoltaic generating system, including any of the above-described kind of control device.
A kind of photovoltaic generating system, including photovoltaic module, booster transformer and any of the above-described kind of photovoltaic combining inverter.
It can be seen from above-mentioned technical scheme that, the application determines currently optimal grid-connected voltage first, then by photovoltaic simultaneously
Net inverter ac side voltage-regulation is to currently optimal grid-connected voltage.In photovoltaic combining inverter output identical premise
Under, the application improves the AC voltage of photovoltaic combining inverter to a certain extent so that ac-side current reduces, and reduces
The energy loss of AC, thus improve the conversion efficiency of photovoltaic combining inverter, and then improves photovoltaic generating system
Generated energy.
Brief description
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of application, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
The photovoltaic generating system control method flow chart that Fig. 1 provides for the embodiment of the present application one；
The photovoltaic generating system control method flow chart that Fig. 2 provides for the embodiment of the present application two；
The photovoltaic generating system control method flow chart that Fig. 3 provides for the embodiment of the present application three；
The MPP voltage that Fig. 4 provides for the embodiment of the present application is in intraday change curve；
Change curve in 1 year for the MPP voltage under the daily maximum temperature that Fig. 5 provides for the embodiment of the present application；
The photovoltaic generating system control device structure chart that Fig. 6 provides for the embodiment of the present application four；
The photovoltaic generating system control device structure chart that Fig. 7 provides for the embodiment of the present application five.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation describes it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of the application protection.
The embodiment of the present application discloses a kind of photovoltaic generating system and its control method, control device and photovoltaic grid-connected inversion
Device, to meet the demand improving photovoltaic combining inverter conversion efficiency, the generated energy of raising photovoltaic generating system.
Above-mentioned photovoltaic generating system includes photovoltaic module, photovoltaic combining inverter and booster transformer.With reference to Fig. 1, this Shen
Please embodiment one provide photovoltaic generating system control method, comprise the steps：
S101：Determine currently optimal grid-connected voltage；
Specifically, due under the conditions of different photovoltaic generating systems, varying environment it is allowed to mains voltage range different,
Good grid-connected voltage is also different, therefore can record the optimal grid-connected voltage in different mains voltage range in advance by the following method：Pin
To each mains voltage range, value successively within the range, the conversion of photovoltaic combining inverter under the different grid-connected voltages of detection
Efficiency, corresponding grid-connected voltage when record conversion efficiency is maximum, and as the most preferably grid-connected electricity in this mains voltage range
Pressure.It should be noted that the method for the current optimal grid-connected voltage of above-mentioned determination is only a kind of specific embodiment of the application,
The application is not limited to aforesaid way.
S102：By the AC voltage-regulation of photovoltaic combining inverter to above-mentioned currently optimal grid-connected voltage.
The principal element of impact photovoltaic combining inverter conversion efficiency, including the copper cash of its IGBT on-state loss and reactor
Loss.Wherein, IGBT on-state loss computing formula is：
（Formula one）
Wherein, IpPeak value for inverter ac side output current.
The copper cash loss calculation formula of reactor is：
Q=I2R（Formula two）
Wherein, I is the virtual value of inverter ac side output current, and R is copper coil resistance.
From formula one and formula two, inverter ac side output current is less, IGBT on-state loss and reactor
Copper cash loss is less, and the conversion efficiency of photovoltaic combining inverter is higher.In photovoltaic combining inverter output identical premise
Under, AC voltage-regulation to currently optimal grid-connected voltage, is improve photovoltaic grid-connected inversion by the present embodiment to a certain extent
The AC voltage of device, so that ac-side current reduces, reduces the energy loss of AC, thus improve grid-connected inverse
Become the conversion efficiency of device, and then improve the generated energy of photovoltaic generating system.
The photovoltaic generating system control method providing with reference to Fig. 2, the embodiment of the present application two, comprises the steps：
S201：Determine currently optimal grid-connected voltage V0；
S202：According to currently optimal grid-connected voltage V0Determine the optimal no-load voltage ratio of booster transformer；
S203：To above-mentioned optimal no-load voltage ratio, this secondary control terminates the no-load voltage ratio adjusting booster transformer.
AC voltage V due to photovoltaic combining inverter is step-up transformer low voltage side voltage, and booster transformer
High side voltage V ' typically constant, therefore the AC voltage V of photovoltaic combining inverter to be changed, can be by changing booster transformer
No-load voltage ratio V:V ' realizes.
The photovoltaic generating system control method providing with reference to Fig. 3, the embodiment of the present application three, comprises the steps：
S301：Determine the different corresponding regulating time of control model and regulation stall；
The control model that the present embodiment provides includes automatic mode and artificial mode.Under automatic mode, can be by corresponding
Device executes mode described in the present embodiment automatically, at least daily to the regulation number of times of the AC voltage of photovoltaic combining inverter
2 times；Under artificial mode, whether manual intervention is adjusted to the AC voltage of photovoltaic combining inverter, adjusts number of times at least
For annual 2 times.
The maximum power point of photovoltaic module（MPP）Voltage can raise with the reduction of temperature.Different time points in one day
Temperature inversion（Degree/day changes）, and in Various Seasonal same time point daily temperature change（Seasonal temperature becomes
Change）, all can cause the change of MPP voltage.And after MPP voltage raises, can suitably increase the AC of photovoltaic combining inverter
Voltage（I.e. grid-connected voltage）So that the conversion efficiency of photovoltaic combining inverter improves.Therefore, the embodiment of the present application is according to not equality of temperature
MPP voltage under degree determines regulating time and regulation stall.
Determine that the corresponding regulating time of automatic mode and the concrete grammar of regulation stall include：
S11：Calculate maximum variation delta V of the MPP voltage of photovoltaic module described in local one day；
By multiple surveying record, can get local MPP voltage in intraday change curve, as shown in figure 4, with V2 table
Show the maximum of MPP voltage in one day, V1 represents the minima of MPP voltage in one day, then Δ V=V2-V1.
S12：Determine regulating time；
The benefit considering adjustment cost and bringing after adjusting, can set daily regulation frequency n, and then selectes every time
Regulating time.Because the time dependent curve of MPP voltage is close to cosine curve, therefore adjusts frequency n and be typically set to even number, choosing
Determining the time point that MPP voltage on curve is V1+i* Δ V/ (n/2+1) is regulating time（I=1,2 ... ..., n/2）.Assume n=2,
Then regulating time is the V1+ Δ V/2 corresponding time, i.e. Fig. 4 midpoint A t1 of the corresponding time and corresponding time t2 of point B.
S13：Determine gear number and the corresponding optimal grid-connected voltage of each gear.
MPP voltage can be divided into several interval, each interval is a gear.Specifically, the present embodiment is according to regulation
Frequency n sets n/2+1 gear, and each gear corresponding MPP voltage range can be represented with equation below：
[V1+ (k-1) * Δ V/ (n/2+1), V1+k* Δ V/ (n/2+1)], wherein, k=1,2 ..., n/2+1.
For each gear（It is each MPP voltage range）, determine its corresponding permission mains voltage range；In this permission
In mains voltage range, value, as the current grid-connected voltage of photovoltaic generating system, detects grid-connected accordingly inverse respectively successively
Become the conversion efficiency of device, when will be maximum for conversion efficiency, corresponding grid-connected voltage value, as optimal grid-connected voltage Vk of this gear, makes
When proper actual MPP voltage is in the corresponding voltage range of k-th gear, the conversion efficiency of photovoltaic combining inverter is satisfied by controlling
System requires, and Vk is set as the corresponding optimal grid-connected voltage of k-th gear.It should be noted that each gear of above-mentioned determination corresponds to
Optimal grid-connected voltage method be only the application a kind of specific embodiment, the application is not limited to aforesaid way.
Accordingly, determine that the concrete grammar of the corresponding regulating time of artificial mode and regulation stall is as follows：
S21：Calculate the maximum variation delta of the MPP voltage of described photovoltaic module under daily maximum temperature in local a year
V’；
Wherein, the MPP voltage under daily maximum temperature is the minimum of daily MPP voltage.By multiple surveying record, can
Obtain MPP voltage under the local daily maximum temperature change curve in a year, as shown in figure 5, representing in 1 year often with V2 '
The maximum of MPP voltage under its maximum temperature, the minima of MPP voltage, then Δ V ' under V1 ' daily maximum temperature in representing a year
=V2’-V1’.
S22：Determine regulating time；
The benefit considering adjustment cost and bringing after adjusting, can set annual regulation frequency n '（N ' is even number）,
And then select each regulating time.It is the time of V1 '+i ' * Δ V '/(n '/2+1) that the present embodiment selectes MPP voltage on curve
Point is regulating time（I '=1,2 ... ..., n '/2）.Assume regulation 4 times every year, then regulating time is respectively V1 '+Δ V '/3（Point A
With point D）And V1 '+2 Δ V '/3（Point B and point C）The corresponding time, i.e. t1, t2, t3 and t4 in Fig. 5.
S23：Determine gear number and the corresponding optimal grid-connected voltage of each gear.
MPP voltage can be divided into several interval, each interval is a gear.Specifically, the present embodiment is according to regulation
Frequency n ' set n '/2+1 gear, the corresponding voltage range of each gear can be represented with equation below：
[V1'+ (k ' -1) * Δ V'/(n'/2+1), V1'+k'* Δ V'/(n'/2+1)], wherein, k'=1,2 ..., n'/2+
1.
Similar with step S113, for each gear（It is each MPP voltage range）, determine its corresponding permission electrical network
Voltage range；In this permission mains voltage range, value, as the current grid-connected voltage of photovoltaic generating system, is examined respectively successively
Survey the conversion efficiency of corresponding photovoltaic combining inverter, when will be maximum for conversion efficiency, corresponding grid-connected voltage value be as this gear
When in the corresponding voltage range of the individual gear of optimal grid-connected voltage Vk ' so that when actual MPP voltage is in kth ', photovoltaic grid-connected inversion
The conversion efficiency of device is satisfied by controlling and requires, and Vk ' is set as kth ' the corresponding optimal grid-connected voltage of individual gear.Need explanation
It is that the method for the corresponding optimal grid-connected voltage of each gear of above-mentioned determination is only a kind of specific embodiment of the application, this Shen
Please be not limited to aforesaid way.
It should be noted that due to the unpredictability of Changes in weather, regulating time may be set to a time period, such as scheme
In 4, first time regulating time value of calculation is t1, and according to weather condition, the practical adjustments time can be in time period [t1- Δ t, t1+ Δ
T] in any instant.
S302：Select present control mode；
Consider climate condition and each impact adjusting to system equipment, the execution that photovoltaic generating system installs ground
And the gain of the generated energy bringing after maintenance cost, and regulation, flexibly select to adopt automatic mode or artificial mode.
S303：When reaching the corresponding regulating time of present control mode, detection current photovoltaic module output is galvanic
MPP voltage U（I.e. maximum power point voltage）；
S304：Currently optimal grid-connected voltage V is determined according to the corresponding regulation stall of current MPP voltage U0；
Determine the MPP voltage range that U is located, that is, determine gear k, thus corresponding optimal grid-connected voltage Vk of this gear is
Currently optimal grid-connected voltage V0.
S305：According to currently optimal grid-connected voltage V0Determine the optimal no-load voltage ratio of booster transformer；
S306：To above-mentioned optimal no-load voltage ratio, this secondary control terminates the no-load voltage ratio adjusting booster transformer.
Specifically, when selected present control mode is automatic mode, can be by the on-load voltage regulation to booster transformer
Device sends corresponding control instruction, so that on-load voltage regulating device is automatically adjusted the no-load voltage ratio of booster transformer to above-mentioned optimal change
Than；When selected present control mode is artificial mode, can be by the optimal no-load voltage ratio of step S305 determination（And U, V0In letter
Breath）Be uploaded to control centre, staff by the state of control centre's monitoring system, and Non-follow control no-load tapping switch or
On-load voltage regulating device, makes the no-load voltage ratio of booster transformer reach optimal no-load voltage ratio.
The characteristic being varied with temperature using MPP voltage from said method step, the embodiment of the present application, according to MPP electricity
Pressure determines currently optimal grid-connected voltage, and by adjusting the no-load voltage ratio of booster transformer by the AC voltage of photovoltaic combining inverter
Adjust to this current optimal grid-connected voltage, improve the AC voltage of photovoltaic combining inverter so that ac-side current reduces,
Thus improve the conversion efficiency of photovoltaic combining inverter, and then improve the generated energy of photovoltaic generating system.In addition, this enforcement
Example additionally provides two kinds of control models, i.e. automatic mode and artificial mode, and every kind of control model corresponds to different regulations time respectively
Number, regulating time, control cost, and bring different generating flow gains, flexibly select control model according to actual needs, can be real
Now control the balance between cost and generating flow gain.
Corresponding with said method embodiment, the embodiment of the present application four additionally provides a kind of photovoltaic generating system and controls dress
Put.As shown in fig. 6, this control device is made up of voltage determination module 601 and VRM Voltage Regulator Module 602.Wherein, voltage determines mould
Block 601 is used for determining currently optimal grid-connected voltage；VRM Voltage Regulator Module 602 is connected with voltage determination module 601, for by photovoltaic
The photovoltaic combining inverter AC voltage-regulation of electricity generation system is to above-mentioned currently optimal grid-connected voltage.
From said structure, the embodiment of the present application determines currently optimal grid-connected voltage by voltage determination module, and leads to
Overvoltage adjustment module is by photovoltaic combining inverter AC voltage-regulation to currently optimal grid-connected voltage.In photovoltaic grid-connected inversion
Under the premise of device output identical, the present embodiment improves the AC voltage of photovoltaic combining inverter to a certain extent,
Ac-side current is reduced, reduces the energy loss of AC, thus improve the conversion efficiency of photovoltaic combining inverter,
And then improve the generated energy of photovoltaic generating system.
Fig. 7 shows the structure of the photovoltaic generating system control device that the embodiment of the present application five provides.This photovoltaic generation system
System includes being sequentially connected with and being formed by photovoltaic module 71, joining unit 72, photovoltaic combining inverter 73 and booster transformer 74.This control
Device processed includes voltage determination module 701, no-load voltage ratio determining module 702, no-load voltage ratio adjustment module 703 and mode selection module 704.
Wherein, mode selection module 704, for determining automatic mode and the corresponding regulating time of artificial mode and tune respectively
Section gear, and select in a kind of control model as present control mode.Mode selection module 704 determines regulating time and tune
Step S301 that the concrete grammar of section gear sees above embodiment of the method three, will not be described here.
Voltage determination module 701 input with mode selection module 704 and photovoltaic combining inverter 73 respectively（Conflux
The outfan of unit 72）Connect；No-load voltage ratio determining module 702 is connected with voltage determination module 701, and no-load voltage ratio adjustment module 703 is respectively
It is connected with mode selection module 704, no-load voltage ratio determining module 702 and booster transformer 74, including self-adjustment module 7031 and people
Work adjustment module 7032.Specifically, self-adjustment module 7031 can be on-load voltage regulating device, and manual adjustment module 7032 includes
Manual supervisory control and no-load tapping switch（Or on-load voltage regulating device）.
When reaching the corresponding regulating time of control model that mode selection module 704 is selected, voltage determination module 701 is examined
Survey the current MPP voltage of photovoltaic module 71, and determine the corresponding regulation stall of current MPP voltage, and then determine currently most preferably simultaneously
Net voltage.No-load voltage ratio determining module 702 determines booster transformer according to the currently optimal grid-connected voltage that voltage determination module 701 determines
Optimal no-load voltage ratio.When the present control mode that mode selection module 704 is selected is automatic mode, self-adjustment module 7031 obtains
Take the optimal no-load voltage ratio that no-load voltage ratio determining module 702 determines, and automatically adjust the no-load voltage ratio of booster transformer 74 to this optimal no-load voltage ratio；When
When the present control mode that mode selection module 704 is selected is artificial mode, the manual supervisory control of manual adjustment module 7032
Obtain optimal no-load voltage ratio（And the current information such as optimal grid-connected voltage）, controllers learn this optimal change by manual supervisory control
Than, and manually control no-load tapping switch（Or on-load voltage regulating device）, the no-load voltage ratio of booster transformer 74 is adjusted to this
Good no-load voltage ratio.
From said apparatus structure and work process, the application implements to determine currently most preferably grid-connected electricity according to MPP voltage
Pressure, and will be currently most preferably grid-connected to this for the AC voltage-regulation of photovoltaic combining inverter by the no-load voltage ratio adjusting booster transformer
Voltage, improves the AC voltage of photovoltaic combining inverter so that ac-side current reduces, thus improve grid-connected inverse
Become the conversion efficiency of device, and then improve the generated energy of photovoltaic generating system.In addition, the present embodiment additionally provides two kinds of control moulds
Formula, i.e. automatic mode and artificial mode, every kind of control model corresponds to different regulation number of times, regulating time respectively, controls cost,
And bring different generating flow gains, flexibly select control model according to actual needs, can achieve and control cost and generated energy to increase
Balance between benefit.
In addition, the embodiment of the present application six additionally provides a kind of photovoltaic generating system, including photovoltaic module, photovoltaic grid-connected inversion
Device, booster transformer, and the control device that foregoing embodiments four or embodiment five provide.
In addition, the embodiment of the present application seven additionally provides a kind of photovoltaic combining inverter, including foregoing embodiments four or enforcement
The control device that example five provides.The photovoltaic combining inverter that the present embodiment provides is applied to photovoltaic generating system, can pass through above-mentioned
Control device adjusts grid-connected voltage（The i.e. AC voltage of photovoltaic combining inverter）.
In addition, the embodiment of the present application eight additionally provides a kind of photovoltaic generating system, including photovoltaic module, booster transformer and
The photovoltaic combining inverter that foregoing embodiments seven provide.
One of ordinary skill in the art will appreciate that realizing all or part of flow process in above-described embodiment method, it is permissible
Instruct related hardware to complete by computer program, described program can be stored in a computer read/write memory medium
In, described program is upon execution, it may include as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be
Magnetic disc, CD, read-only memory（Read-Only Memory, ROM）Or random access memory（Random Access
Memory, RAM）Deng.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the application.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can be realized in the case of without departing from spirit herein or scope in other embodiments.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The scope the widest causing.
Claims (10)
1. a kind of photovoltaic generating system control method, described photovoltaic generating system include photovoltaic module, photovoltaic combining inverter and
Booster transformer is it is characterised in that described control method includes：
Determine currently optimal grid-connected voltage, including：Determining allows described photovoltaic generating system to reach under current environmental condition
Grid-connected voltage scope；Find in the range of described grid-connected voltage when the conversion efficiency of described photovoltaic combining inverter reaches maximum pair
The grid-connected voltage answered, as currently optimal grid-connected voltage；
By described photovoltaic combining inverter AC voltage-regulation to described currently optimal grid-connected voltage；
Wherein, before described determination currently optimal grid-connected voltage, also include：Determine the different corresponding regulating time of control model
And regulation stall；Described control model includes automatic mode and artificial mode；The conduct of one of described control model is selected to work as
Front control model, and according to corresponding regulating time and regulation stall, described photovoltaic generating system is controlled；
Specifically, the corresponding regulating time of automatic mode and regulation stall are determined, including：
Calculate maximum variation delta V of the MPP voltage of photovoltaic module described in local one day；Wherein, Δ V=V2-V1, V2 are one
The maximum of MPP voltage in it, V1 is the minima of MPP voltage in one day；
Determine that the time point that MPP voltage is V1+i* Δ V/ (n/2+1) is described regulating time；Wherein, n is even number, represents daily
Regulation number of times, i=1,2 ... ..., n/2；
Determine that the corresponding MPP voltage range of k-th regulation stall is [V1+ (k-1) * Δ V/ (n/2+1), V1+k* Δ V/ (n/2+
], and set corresponding optimal grid-connected voltage Vk in this interval 1)；Wherein, k=1,2 ..., n/2+1；
The described determination corresponding regulating time of artificial mode and regulation stall include：
Calculate maximum variation delta V of the MPP voltage of described photovoltaic module under daily maximum temperature in local a year '；Wherein, Δ
V '=V2 '-V1 ', V2 ' are the maximum of MPP voltage under daily maximum temperature in a year, and V1 ' is daily maximum temperature in a year
The minima of lower MPP voltage；
Determine that the time point that MPP voltage is V1 '+i ' * Δ V '/(n '/2+1) is described regulating time；Wherein, n ' is even number, table
Show annual regulation number of times, i '=1,2 ... ..., n '/2；
Determining kth ' the corresponding MPP voltage range of individual regulation stall is [V1'+ (k'-1) * Δ V'/(n'/2+1), V1'+k'* Δ
V'/(n'/2+1)], and set corresponding optimal grid-connected voltage Vk in this interval ', wherein, k'=1,2 ..., n'/2+1.
2. photovoltaic generating system control method according to claim 1 is it is characterised in that described will be described grid-connected inverse
Become device AC voltage-regulation to described currently optimal grid-connected voltage, concrete grammar includes：
Determine the optimal no-load voltage ratio of described booster transformer according to described currently optimal grid-connected voltage；
The no-load voltage ratio adjusting described booster transformer is to described optimal no-load voltage ratio.
3. photovoltaic generating system control method according to claim 2 is it is characterised in that when described present control mode is
During automatic mode, the no-load voltage ratio of the described booster transformer of described regulation to described optimal no-load voltage ratio, including：By on-load voltage regulating device certainly
The dynamic no-load voltage ratio adjusting described booster transformer is to described optimal no-load voltage ratio；
When described present control mode is artificial mode, the no-load voltage ratio of the described booster transformer of described regulation is to described optimal change
Than, including：Control no-load tapping switch or on-load voltage regulating device by artificial, the no-load voltage ratio to adjust described booster transformer is to institute
State optimal no-load voltage ratio.
4. photovoltaic generating system control method according to claim 1 is it is characterised in that described determination is currently most preferably grid-connected
Voltage includes：
When reaching the corresponding regulating time of described present control mode, detect the current MPP voltage of described photovoltaic module；
Described currently optimal grid-connected voltage is determined according to the corresponding regulation stall of described current MPP voltage.
5. a kind of photovoltaic generating system control device, described photovoltaic generating system include photovoltaic module, photovoltaic combining inverter and
Booster transformer is it is characterised in that described control device includes：
Voltage determination module, for determining currently optimal grid-connected voltage, including：Determine and allow described light under current environmental condition
The grid-connected voltage scope that photovoltaic generating system reaches；The conversion of described photovoltaic combining inverter is found in the range of described grid-connected voltage
Efficiency reaches corresponding grid-connected voltage during maximum, as currently optimal grid-connected voltage；
VRM Voltage Regulator Module, is connected with described voltage determination module, for adjusting described photovoltaic combining inverter AC voltage
Save to described currently optimal grid-connected voltage；
Mode selection module, is connected with described voltage determination module, for determine the corresponding regulating time of different control models and
Regulation stall, and select one of described control model as present control mode；Described control model includes automatic mode
And artificial mode；
Specifically, the corresponding regulating time of automatic mode and regulation stall are determined, including：
Calculate maximum variation delta V of the MPP voltage of photovoltaic module described in local one day；Wherein, Δ V=V2-V1, V2 are one
The maximum of MPP voltage in it, V1 is the minima of MPP voltage in one day；
Determine that the time point that MPP voltage is V1+i* Δ V/ (n/2+1) is described regulating time；Wherein, n is even number, represents daily
Regulation number of times, i=1,2 ... ..., n/2；
Determine that the corresponding MPP voltage range of k-th regulation stall is [V1+ (k-1) * Δ V/ (n/2+1), V1+k* Δ V/ (n/2+
], and set corresponding optimal grid-connected voltage Vk in this interval 1)；Wherein, k=1,2 ..., n/2+1；
The described determination corresponding regulating time of artificial mode and regulation stall include：
Calculate maximum variation delta V of the MPP voltage of described photovoltaic module under daily maximum temperature in local a year '；Wherein, Δ
V '=V2 '-V1 ', V2 ' are the maximum of MPP voltage under daily maximum temperature in a year, and V1 ' is daily maximum temperature in a year
The minima of lower MPP voltage；
Determine that the time point that MPP voltage is V1 '+i ' * Δ V '/(n '/2+1) is described regulating time；Wherein, n ' is even number, table
Show annual regulation number of times, i '=1,2 ... ..., n '/2；
Determining kth ' the corresponding MPP voltage range of individual regulation stall is [V1'+ (k'-1) * Δ V'/(n'/2+1), V1'+k'* Δ
V'/(n'/2+1)], and set corresponding optimal grid-connected voltage Vk in this interval ', wherein, k'=1,2 ..., n'/2+1.
6. photovoltaic generating system control device according to claim 5 is it is characterised in that described VRM Voltage Regulator Module bag
Include：
No-load voltage ratio determining module, is connected with described voltage determination module, described in being determined according to described currently optimal grid-connected voltage
The optimal no-load voltage ratio of booster transformer；
No-load voltage ratio adjustment module, is connected with described no-load voltage ratio determining module and described booster transformer, respectively for adjusting described boosting
The no-load voltage ratio of transformator is to described optimal no-load voltage ratio.
7. photovoltaic generating system control device according to claim 6 is it is characterised in that described no-load voltage ratio adjustment module bag
Include：
Self-adjustment module, is connected with described mode selection module, no-load voltage ratio determining module and described booster transformer respectively, is used for
When the described present control mode that described mode selection module is selected is automatic mode, obtain described optimal no-load voltage ratio, and automatically
The no-load voltage ratio of described booster transformer is adjusted to described optimal no-load voltage ratio；
Manual adjustment module, is connected with described mode selection module, no-load voltage ratio determining module and described booster transformer respectively, is used for
When the described present control mode that described mode selection module is selected is artificial mode, obtain described optimal no-load voltage ratio, and in people
Under industry control system, the no-load voltage ratio of described booster transformer is adjusted to described optimal no-load voltage ratio.
8. a kind of photovoltaic generating system it is characterised in that include photovoltaic module, photovoltaic combining inverter, booster transformer, and
Photovoltaic generating system control device as any one of claim 5 to 7.
9. a kind of photovoltaic combining inverter, is applied to photovoltaic generating system it is characterised in that including as appointed in claim 5 to 7
Photovoltaic generating system control device described in one.
10. a kind of photovoltaic generating system is it is characterised in that include photovoltaic module, booster transformer and as claimed in claim 9
Photovoltaic combining inverter.
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| CN101577509A (en) * | 2009-06-09 | 2009-11-11 | 华中科技大学 | Photovoltaic conversion system |
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