CN105094203A - Control method for multi-way Boost circuit - Google Patents
Control method for multi-way Boost circuit Download PDFInfo
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- CN105094203A CN105094203A CN201510501389.2A CN201510501389A CN105094203A CN 105094203 A CN105094203 A CN 105094203A CN 201510501389 A CN201510501389 A CN 201510501389A CN 105094203 A CN105094203 A CN 105094203A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The embodiment of the invention provides a control method for work switching of a multi-way Boost circuit. Through the method, the optimization of power output of an inverter can be achieved. Detailedly, according to the technical scheme, through the relation of the position coefficient k and the power curve, the position where a working point is located on the power curve can be judged according to the size of the position coefficient k, then the working mode of the Boost is controlled, switching loss brought by Boost working can be reduced, and the overall efficiency of a system is improved.
Description
Technical field
The present invention relates to a kind of control method of Boost circuit, relate to the control method of the multichannel Boost circuit based on photovoltaic DC-to-AC converter particularly.
Background technology
Along with environmental problem is constantly taken seriously and the energy strategy problem of country, large-scale development novel energy obtains the most attention of countries in the world, New Energy Industry becomes industry with fastest developing speed in the world, and solar electrical energy generation will exceed nuclear power in 21st century becomes one of most important basic energy resource.
Group serial type photovoltaic DC-to-AC converter is one of current photovoltaic combining inverter important composition, and the difference according to its input is divided into: single channel MPPT (MaximumPowerPointTracking, MPPT maximum power point tracking) and multichannel MPPT type.
The difference of single channel MPPT and multichannel MPPT control mode is:
1, from the whether out-of-work switching of Boost, multichannel Boost is present in multiple possibility, can be that the Boost of multichannel PV switches simultaneously, or switch according to corresponding conditions one by one.
2, from MPPT algorithm, single channel PV only has a Boost, and need now to complete n road Boost simultaneously, if there is the out-of-work situation of i (1≤i≤n) road PVBoost, need to realize unified MPPT for i road PV, and other roads PV must start Boost work, complete independently MPPT separately.
The logic of the control start and stop of single channel Boost is simple, and the complexity of the Boost on off control of multichannel PV input correspondence significantly improves, and the diversity of control is also corresponding to be increased.In order to realize the maximization of PV output power, we wish that each road PV and Boost can work alone, and have independently MPPT separately and control.When each road PV voltage is lower than line voltage, the Boost that each road PV is corresponding starts work, respective complete independently MPPT, and the power that each road PV exports can realize maximizing.But, if PV voltage is higher than line voltage, to allow each road Boost all work on, Bus voltage just needs the maximal value higher than PV voltage, so not only there is loss in Boost work, and the switching loss of inverter also can improve corresponding increase because of Bus voltage.To quit work if allow higher than the Boost that the PV of line voltage is corresponding, not only can avoid the switching loss of Boost, the switching loss of inverter also can reduce because Bus is operated on maximum PV voltage.When the different from those of each road PV is basically identical, lighting conditions also close to time, the voltage of the maximum power point of each road PV is consistent, therefore, is quit work by Boost corresponding for the PV higher than line voltage, is conducive to the whole efficiency improving photovoltaic system.But there is PV characteristic inconsistent and not equal probabilistic factor of illumination condition in each road in reality, therefore, probably occur that multichannel PV voltage is higher than line voltage, and the situation that the voltage phase difference of each road PV maximum power point is larger.If the Boost corresponding higher than the PV of line voltage quits work, oneself maximum power point possibility far away is departed from the working point that certainly will there is some road PV.Although Boost quits work can decrease switching loss, because the MPPT efficiency of this road PV is on the low side, the power causing photovoltaic system to export still does not reach maximization.Therefore, when each road PV is higher, Boost work can be stopped when should ensureing each road PV characteristic close to carry out Loss reducing, can ensure again when the maximum power point voltage of some road PV is far away lower than real work point, by restarting Boost work, the MPPT of this road of complete independently PV, improves the efficiency of this road MPPT, thus ensures the maximization of photovoltaic system whole efficiency as much as possible.Generally speaking, only have efficiency and the Boost switching loss of comprehensive assessment PV output power, select suitable Boost start and stop switching condition, the efficiency of photovoltaic generation could be improved as much as possible, therefore, in the occasion that multichannel PV characteristic difference is larger, seek one and be conducive to the maximized powerinjected method method of photovoltaic system output power, have very high practical value.
Summary of the invention:
For solving the problem, the present invention proposes a kind of multichannel Boost control method based on photovoltaic DC-to-AC converter.Reduce while simplification controls because Boost works the switching loss brought, the power that maximized optimization is grid-connected, provides economic benefit.
For achieving the above object, the present invention adopts following technical scheme:
The control method of multichannel Boost circuit: described circuit comprises: many Boost branch roads, every bar Boost branch road is all electrically connected the input end of corresponding photovoltaic module; The direct-flow input end of corresponding inverter is electrically connected to after the same polarity terminal parallel connection of the output terminal of every bar Boost branch road; The alternating current produced through inverter conversion is delivered to electrical network or load, it is characterized in that: described method comprises: start Boost when Boost circuit meets entry condition; Boost is stopped when Boost circuit meets stop condition.
Preferably, in said method, Boost circuit meets stop condition and is:
Condition 1: this road PV voltage given value is greater than Boost and quits work setting threshold values U
th1; Or
Condition 2: the difference of this road PV voltage and Bus voltage given is less than setting threshold values U
th3.
Preferably, in said method, Boost circuit meets entry condition and is:
Condition 1:PV voltage given value is less than Boost and starts operation setup threshold values U
th2; Or
Condition 2: the position parameter k value of this road PV is greater than setting threshold values Kth.
Further, above-mentioned k value is expressed as:
at the k=1 at maximum power point place, and k>1 on the right side of powertrace, k<1 on the left of powertrace, along with powertrace is moved to open-circuit voltage by maximum power point, coefficient k increases near exponential form.
Beneficial effect
The Boost operation control method proposed by the embodiment of the present invention, realize the optimization that inverter power exports, the position parameter k proposed by the technical program and the relation of powertrace, the position that working point is residing in powertrace can be judged according to the size of position parameter k, and then the mode of operation of control Boost, can reduce because Boost works the switching loss brought, improve the whole efficiency of system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the photovoltaic system structural drawing of the multichannel Boost input of the embodiment of the present invention;
Fig. 2 is the control schematic diagram that the single channel Boost of the embodiment of the present invention starts and stops;
Fig. 3 is the out-of-work control schematic diagram of the 1st road Boost of the embodiment of the present invention;
Fig. 4 is the out-of-work control schematic diagram of i-th+1 (i>1) road Boost of the embodiment of the present invention;
Fig. 5 is the control schematic diagram that the i road PV stopping Boost working of the embodiment of the present invention starts Boost simultaneously;
Fig. 6 is the graph of a relation between the PV output power of the embodiment of the present invention and PV voltage;
Fig. 7 is the control schematic diagram that Boost that the PV departing from maximum power point of the embodiment of the present invention is corresponding starts one by one;
Fig. 8 be the PV voltage U pv of the embodiment of the present invention and PV output power P,
and
curved line relation schematic diagram;
Fig. 9 is the position parameter k of the embodiment of the present invention and the graph of a relation of output power P and photovoltaic module voltage;
Figure 10 is the position parameter k of the embodiment of the present invention and the graph of a relation of photovoltaic module temperature;
Figure 11 is the position parameter k of the embodiment of the present invention and the graph of a relation of intensity of illumination;
Figure 12 is the control method process flow diagram of a kind of multichannel Boost of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
In order to describe technical scheme of the present invention better: first composition graphs 1, photovoltaic system structural drawing (a kind of multichannel Boost circuit of multichannel Boost input, comprise: many Boost branch roads, every bar Boost branch road is all electrically connected the input end of corresponding photovoltaic module; The direct-flow input end of corresponding inverter is electrically connected to after the same polarity terminal parallel connection of every bar Boost branch road output terminal; Produce alternating current through inverter conversion and be delivered to electrical network) describe the switching of the Boost on off control pattern of single channel PV, when n road PV is in parallel, the control mode switch of Boost obtains on the basis of single channel switching thinking, the process of the Boost control mode switch that single channel PV is corresponding is as follows: as shown in Figure 2, is the control schematic diagram that PV single channel Boost starts and stops.Wherein, the Rule of judgment that single channel PV is corresponding Boost starts and stops is as follows: Boost stop condition: this road PV voltage given value is greater than Boost and quits work setting threshold values U
th1; The PV voltage given value that Boost entry condition: Boost has stopped being less than Boost and starting operation setup threshold values U
th2.
During single channel Boost, the startup of Boost and the operating mode of stopping correspondence, can be divided into 5 sections of operation intervals:
0 ~ t1 time period:
At this moment between in section, PV voltage is significantly less than Bus voltage, and Boost normally works, and Bus voltage given obtains (can in advance setting voltage value) according to inverter side electric information; Boost circuit and inverter circuit be control PV voltage and Bus voltage respectively.
T1 ~ t2 time period:
When entering t1 moment, the difference of PV voltage and Bus voltage is less than certain setting value, but PV voltage not yet reaches the out-of-work threshold voltage of Boost, in order to ensure the normal work of DCBoost, within this time period, the set-point of Bus is forced higher than the given voltage certain value of PV.
T2 ~ t3 time period:
When entering t2 moment, PV voltage given reaches the out-of-work threshold voltage U of Boost
th1, now the set-point of Bus voltage is set to PV voltage given value, and Boost will quit work, and this state is until the threshold voltage U that again starts lower than Boost of PV voltage
th2till.
T3 ~ t4 time period:
When entering t3 moment, the threshold voltage U that PV voltage given value starts again lower than Boost
th2, DC side starts Boost work again, Boost circuit and inverter circuit control PV voltage and Bus voltage respectively again.In this stage, also for ease of the normal work ensureing DCBoost, the set-point of Bus is forced higher than the given voltage certain value of PV.
After the t4 moment:
After the t4 moment, the given voltage of PV is lower than U
th2after certain value, Bus voltage given is no longer restrained, is determined (this interval operating mode is consistent with 0 ~ t1 time period) by inverter side electric information completely.
When n road PV is in parallel, as shown in Figure 3, because each road PV characteristic is inconsistent, the peak power working point of each road PV is caused to be not quite similar, certainly will there is Boost circuit corresponding to a certain road PV first out-of-work situation, the out-of-work situation of Boost circuit that the 1st road PV the is corresponding Boost circuit out-of-work situation corresponding with the single channel PV introduced above is consistent.The out-of-work condition of Boost circuit that 1st road PV is corresponding is as follows:
The out-of-work condition of 1st road Boost: this road PV voltage given value is greater than Boost and quits work setting threshold values U
th1;
But the Rule of judgment of Rule of judgment the then with 1st out-of-work Boost in tunnel when the Boost circuit that the i-th tunnel (1<i≤n) PV is corresponding quits work is different.
The out-of-work condition of i-th tunnel (1<i≤n) Boost: the difference of this road PV voltage given and Bus voltage given is less than setting threshold values U
th3.
As shown in Figure 4, if the Boost circuit having i road PV corresponding quits work, enter the t1 moment, the difference of the i-th+1 PV and Bus voltage given is less than setting value U
th3time, the Boost corresponding to the PV of this road will quit work, and so far quit work by Boost corresponding for total i+1 bar PV, this part PV enters centralized MPPT pattern.The given changed power by this i+1 bar of Bus decides, and Jiang Zhe i+1 road PV regards an entirety as to complete centralized MPPT function.
The control model of the Boost circuit that PV is corresponding; Being divided into a) multichannel PV to start Boost mode of operation, B simultaneously) multichannel PV starts Boost mode of operation one by one.
A) multichannel PV starts Boost mode of operation simultaneously, and the PV voltage given value having stopped Boost working is less than Boost and starts operation setup threshold values U
th2.
As shown in Figure 5, if the i road PV voltage having stopped Boost working starts threshold values U lower than Boost
th2time, the Boost circuit that this i road PV is corresponding starts work simultaneously, and each road PV recovers separately independently MPPT pattern, and Bus voltage given determined by inverter side information.
B) multichannel PV starts Boost mode of operation one by one
As shown in Figure 7, before time tl, the Boost circuit of existing n road PV quits work, incision Bus control model.Cut out and to be in as shown in Fig. 6 orbicular spot on the right side of powertrace and to depart from maximum functional point PV far away, start the Boost circuit work corresponding to the PV of this road, can prevent from existing the actual maximum power point voltage of PV voltage and the larger situation of working voltage difference, thus be conducive to the efficiency improving the overall MPPT of photovoltaic system.
Technical scheme:
Cause, the instantaneous output of photovoltaic battery panel is: P=UI, and wherein, P is the power that PV exports, and U is PV voltage, and I is PV electric current.
Instantaneous output is obtained cell output voltage differentiate:
time, the output power of photovoltaic cell reaches maximum.
Can derive: demand fulfillment following relation when working point is positioned at maximum power point:
As shown in Figure 8, transverse axis is PV voltage, and the longitudinal axis is the ratio of the ratio of PV output power, current differential and voltage derivative, PV output current and voltage.
As shown in Figure 9, be the graph of a relation of position parameter k and photovoltaic module voltage, wherein, k is expressed as:
as shown in Figure 9, at the k=1 at maximum power point place, and k>1 on the right side of powertrace, k<1 on the left of powertrace, along with powertrace is moved to open-circuit voltage by maximum power point, coefficient k increases near exponential form.By further studying discovery,
As shown in Figure 9, there is relation one to one in the difference of powertrace and coefficient k, and along with power constantly reduces on the right side of curve, and coefficient k increases gradually.
The position that working point is residing in powertrace and then the mode of operation of control Boost can be judged according to the size of position parameter k.
As shown in Figure 10, be the coefficient k value of power 0.995 times of peak power place (getting the power points on the right side of powertrace) and the relation of temperature, illumination is 1000W/m
2, PV is cSi cell panel, and as can be seen from Figure during temperature variation, coefficient k is acted upon by temperature changes hardly.
As shown in figure 11, for the coefficient k value of power 0.995 times of peak power place (getting the power points on the right side of powertrace) and the relation of illumination, temperature is definite value 25 DEG C, and PV is cSi cell panel, as can be seen from Figure during illumination variation, coefficient k is by the impact hardly by illumination variation.
Total way of PV assembly input is n (n>1), and the i-th tunnel is PV assembly input Zhong mono-tunnel, N road, and whether the Boost circuit corresponding according to start and stop condition judgment each road PV of each road PV works; As shown in figure 12, be the control method of a kind of multichannel Boost: described method comprises following steps:
First, calculate the start and stop condition of Boost,
The initial value of PV numbering i is set to 1,
Then, judge whether the i-th road Boost starts work,
If the i-th road Boost starts work,
Judge whether out-of-work Boost way is 0
If out-of-work Boost way is 0,
Then judge whether the i-th road Boost meets stop condition 1,
If satisfy condition, the i-th road Boost quits work; Otherwise the i-th road Boost works on.
If out-of-work Boost way is not 0,
Then judge whether the i-th road Boost meets stop condition 2,
If satisfy condition, the i-th road Boost quits work; Otherwise the i-th road Boost works on.
If the i-th road Boost quits work,
Judge whether out-of-work Boost way is 1
If out-of-work Boost way is 1,
Then judge whether the i-th road Boost meets entry condition 1,
If satisfy condition, the i-th road Boost starts work; Otherwise the i-th road Boost continues to quit work.
If out-of-work Boost way is not 1,
Then judge whether the i-th road Boost meets entry condition 1 or entry condition 2,
If satisfy condition, the i-th road Boost starts work; Otherwise the i-th road Boost continues to quit work.
Judge the start and stop duty of the i-th road Boost, then judged whether i equals maximum PV way n,
If i equals n, terminate the judgement flow process of Boost start and stop duty;
Otherwise i+1, continues the above-mentioned judgement of circulation.
Condition stub:
The account form of PV voltage given is as follows:
Operating mode 1: the Boost of all PV is in work
Each road PV, according to respective PV output power information complete independently MPPT, calculates alone the voltage given value of each road PV.
Operating mode 2: have at least the Boost of 1 road PV to stopped work
When the Boost of i road (i=1 ~ n, n are the total way of PV) PV quits work, regard this i road PV as an entirety, concentrated MPPT, the PV voltage given calculated is as Bus voltage given value.And remaining other roads PV calculates alone the voltage given value of each road PV.
In addition, should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (5)
1. a control method for multichannel Boost circuit, described circuit comprises: many Boost branch roads, and every bar Boost branch road is all electrically connected the input end of corresponding photovoltaic module; The direct-flow input end of corresponding inverter is electrically connected to after the same polarity terminal parallel connection of the output terminal of every bar Boost branch road; The alternating current produced through inverter conversion is delivered to electrical network or load, it is characterized in that: described control method comprises: start Boost circuit work when Boost circuit meets entry condition; Boost circuit work is stopped when Boost circuit meets stop condition.
2. the method for claim 1, is characterized in that: in described method, Boost circuit meets stop condition and is:
Condition 1: the PV voltage given value of described branch road is greater than Boost out-of-work setting threshold values U
th1; Or
Condition 2: the PV voltage of described branch road and the difference of Bus voltage given are less than setting threshold values U
th3.
3. the method for claim 1, is characterized in that: in said method Boost circuit meet multichannel simultaneously entry condition be that PV voltage given value is less than Boost and starts operation setup threshold values U
th2;
Or
In said method Boost circuit meet multichannel one by one entry condition be that the position parameter k value that the PV voltage of described branch road is corresponding is greater than setting threshold values K
th.
4. method as claimed in claim 3, is characterized in that: described position parameter k is expressed as
5. method as claimed in claim 4, it is characterized in that: described position parameter k, at maximum power point place k=1, and k>1 on the right side of powertrace, k<1 on the left of powertrace, along with powertrace is moved to open-circuit voltage by maximum power point, coefficient k increases near exponential form.
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| CN105807841A (en) * | 2016-03-08 | 2016-07-27 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Power ring control load limiting method and device |
| CN105871324A (en) * | 2016-04-11 | 2016-08-17 | 厦门科华恒盛股份有限公司 | Independent MPPT tracking method for multi-branch input photovoltaic inverter system |
| CN107742902A (en) * | 2017-11-14 | 2018-02-27 | 江苏佳讯纳通能源技术有限公司 | A kind of multichannel MPPT input pattern determination methods of photovoltaic DC-to-AC converter |
| CN111708401A (en) * | 2020-08-20 | 2020-09-25 | 浙江艾罗网络能源技术有限公司 | Photovoltaic module maximum power tracking method suitable for multiple connection modes |
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| CN105807841A (en) * | 2016-03-08 | 2016-07-27 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | Power ring control load limiting method and device |
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| CN111708401A (en) * | 2020-08-20 | 2020-09-25 | 浙江艾罗网络能源技术有限公司 | Photovoltaic module maximum power tracking method suitable for multiple connection modes |
| WO2022037027A1 (en) * | 2020-08-20 | 2022-02-24 | 浙江艾罗网络能源技术股份有限公司 | Photovoltaic assembly maximum power tracking method applicable to multiple connection types |
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