CN205070786U - High -efficient photovoltaic power optimizer series connection topology circuit - Google Patents
High -efficient photovoltaic power optimizer series connection topology circuit Download PDFInfo
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- CN205070786U CN205070786U CN201520852507.XU CN201520852507U CN205070786U CN 205070786 U CN205070786 U CN 205070786U CN 201520852507 U CN201520852507 U CN 201520852507U CN 205070786 U CN205070786 U CN 205070786U
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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 utility model discloses a high -efficient photovoltaic power optimizer series connection topology circuit, including photovoltaic array, optimizer, inductance, every photovoltaic array's output and an optimizer are parallelly connected, and the head and the tail end of all optimizers concatenates in proper order and constitutes an optimizer subassembly cluster, optimizer subassembly cluster connects to the input of dc -to -ac converter behind inductance, third switch tube. The utility model discloses an inductance of each optimizer sharing can be stabilized the optimizer unstability and to the deviation that maximum power point trailed, reduce whole inductance volume simultaneously, has practiced thrift the material, has reduced the cost of manufacture, be equipped with the third switch tube on the optimizer subassembly cluster outgoing line, when the current exist the refluence probably or the electric current be the zero hour, the shutoff of third switch tube, current conveyance third diode flows through for the circuit does not have the loss of diode tube voltage drop as far as possible when the electric current is not interrupted, promoted system efficiency.
Description
Technical field
The utility model relates to technical field of new energies, particularly a kind of high-efficiency photovoltaic power optimization device series topology circuit.
Background technology
Photovoltaic power optimizer is mainly used in the photovoltaic plant adopting multiple photovoltaic module connection in series-parallel form.Photovoltaic power optimizer is to solve the problem causing inverter inefficiency when maximum power point tracking (MPPT) is carried out in part or all of assembly unification because of each inter-module existence difference in power station.Adding the structure after photovoltaic power optimizer is after one piece or several pieces of photovoltaic modulies are first carried out connection in series-parallel by original inverter front end, the direct current conversion of DC/DC is carried out by photovoltaic power optimizer, the AC/DC conversion of DC/AC is realized again by inverter, thus can realize one piece of the access of its front end of photovoltaic power optimizer or the unified MPPT of several pieces of photovoltaic modulies, whole audience various piece independently MPPT can be obtained like this, thus can be provided in photovoltaic module state inconsistent time obtain the whole audience relatively high-output power.But photovoltaic power optimizer to be set up in photovoltaic generating system, the construction cost of system can be increased, and will multi-stage power conversion be carried out, can circuit efficiency be reduced, thus make the systems generate electricity amount when photovoltaic module state is approximate may not rise counter falling.
Summary of the invention
In order to solve the problems of the technologies described above, the utility model provides the high-efficiency photovoltaic power optimization device series topology circuit that a kind of cost is low, circuit efficiency is high.
The technical scheme that the utility model solves the problem is: a kind of high-efficiency photovoltaic power optimization device series topology circuit, comprise photovoltaic array, optimizer, inductance, the output of each photovoltaic array and an optimizer parallel connection, the two ends of all optimizers are connected in series formation optimizer component string successively, and described optimizer component string is connected to the input of inverter after inductance.
In above-mentioned high-efficiency photovoltaic power optimization device series topology circuit, described optimizer comprises the first switching tube, second switch pipe, first diode, second diode and the first electric capacity, described first electric capacity is in parallel with photovoltaic array, the grid access drive circuit of the first switching tube, the drain electrode of the first switching tube is connected with one end of the first electric capacity, the positive pole of the first diode is connected with the source electrode of the first switching tube, the negative pole of the first diode is connected with the drain electrode of the first switching tube, the grid access drive circuit of second switch pipe, the source electrode of second switch pipe is connected with the other end of the first electric capacity, the positive pole of the second diode is connected with the source electrode of second switch pipe, the negative pole of the second diode is connected with the drain electrode of second switch pipe, next optimizer is connected to after the drain electrode of second switch pipe is connected with the source electrode of the first switching tube.
In above-mentioned high-efficiency photovoltaic power optimization device series topology circuit, the 3rd switching tube is provided with between described inductance and the input of inverter, 3rd switching tube comprises switch and is attempted by the 3rd diode of switch ends, the positive pole of the 3rd diode is connected with inductance, and the negative pole of the 3rd diode is connected with the input of inverter.
The beneficial effects of the utility model are:
1, all storage capacitor is not set in each optimizer output of the present utility model, reduce the cost of photovoltaic power optimizer, and generally need owing to using storage capacitor to use electrochemical capacitor, and the life-span of electrochemical capacitor is usually the shortest in whole circuit, thus improve system reliability and life-span simultaneously;
2, each optimizer of the present utility model shares an inductance, the unstable deviation for maximal power tracing of optimizer can be stabilized, the resistance of inductance is little, improve circuit efficiency, replace each discrete inductance can obtain less overall inductance volume with a shared inductance simultaneously, saved material, reduced cost of manufacture, manufacture craft is also simpler;
3, the utility model is provided with the 3rd switching tube with the 3rd diode on optimizer component string outlet line, when there is the possibility of refluence in circuital current or electric current is zero, 3rd switching tube turns off, electric current is flow through by the 3rd diode, make circuit there is no diode tube pressuring drop loss when electric current is not interrupted as far as possible, improve system effectiveness;
4, the utility model depends on the control of the 3rd switching tube, the second switch pipe of optimizer is made to allow the conducting when electric current afterflow and there will not be electric current backflow, greatly reduce the diode tube pressuring drop loss of each optimizer circuit when electric current afterflow, improve system effectiveness.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of prior art.
Fig. 2 is circuit diagram of the present utility model.
Fig. 3 is the schematic diagram of the utility model mode I.
Fig. 4 is the schematic diagram of the utility model mode II.
Fig. 5 is the schematic diagram of the utility model mode III.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
As shown in Figure 2, high-efficiency photovoltaic power optimization device series topology circuit comprises photovoltaic array 1, optimizer 2, inductance 4, output and an optimizer 2 of each photovoltaic array 1 are in parallel, the two ends of all optimizers 2 are connected in series formation optimizer component string successively, described optimizer component string is connected to the input of inverter after inductance 4, the 3rd switching tube, 3rd switching tube comprises switch 3 and is attempted by the 3rd diode 5 at switch 3 two ends, the positive pole of the 3rd diode 5 is connected with inductance 4, and the negative pole of the 3rd diode 5 is connected with the input of inverter.
Each optimizer 2 comprises the first switching tube 6, second switch pipe 7, first diode 8, second diode 9 and the first electric capacity 10, described first electric capacity 10 is in parallel with photovoltaic array 1, the grid access drive circuit of the first switching tube 6, the drain electrode of the first switching tube 6 is connected with one end of the first electric capacity 10, the positive pole of the first diode 8 is connected with the source electrode of the first switching tube 6, the negative pole of the first diode 8 is connected with the drain electrode of the first switching tube 6, the grid access drive circuit of second switch pipe 7, the source electrode of second switch pipe 7 is connected with the other end of the first electric capacity 10, the positive pole of the second diode 9 is connected with the source electrode of second switch pipe 7, the negative pole of the second diode 9 is connected with the drain electrode of second switch pipe 7, next optimizer is connected to after the drain electrode of second switch pipe 7 is connected with the source electrode of the first switching tube 6.
When photovoltaic power optimizer have employed classical Buck circuit form, its rear end needs to arrange storage capacitor (see figure 1), without the need to arranging this electric capacity in the utility model, thus the cost of photovoltaic power optimizer is reduced, and generally need owing to using storage capacitor to use electrochemical capacitor, and the life-span of electrochemical capacitor is usually the shortest in whole circuit, thus improve system reliability and life-span simultaneously;
In high-efficiency photovoltaic power optimization device series topology circuit, due to the inductance of each Buck circuit is replaced to an inductance 4, because there is relation in inductance 4: L ∝ n
2v(wherein n is coil turn, and V is inductance volume), and there is approximation relation R ∝ nV in inductive resistance
(2/3), thus have L/R ∝ nV
(1/3)if namely can obtain conclusion and keep total inductance value certain, then L/R value is larger so to replace each discrete inductance with a shared inductance, and thus inductive resistance is less, makes circuit system efficiency improve like this, simultaneously because relation L ∝ n
2v, under maintenance inductance total inductance is worth constant prerequisite, replaces each discrete inductance can obtain less overall inductance volume with a shared inductance, thus more saves material, also more simple in manufacture craft, reduces system hardware cost.
The control method of above-mentioned high-efficiency photovoltaic power optimization device series topology circuit, comprises the following steps:
Under normal output power state:
Step one: controlled by PWM, drive that the first switching tube is opened, second switch pipe closes, now circuit enters mode I, and circuital current passes through from the first switching tube, the external power output of photovoltaic array;
Step 2: requirement PWM controlled according to photovoltaic module MPPT maximum power point tracking and after terminating mode I, drive the first switching tube closedown, the closedown of second switch pipe, now circuit enters mode II(mode II is an intermediate state preventing short circuit, its duration is fixed and extremely short, such as switching control frequency 43kHz, there were 255 calibration in one cycle, then this state for time is about (43000 × 255)
(-1)≈ 91.2ns), circuital current passes through from the fly-wheel diode of second switch pipe, and photovoltaic array is power output not, and circuit is in freewheeling state, and the second diode exists power loss;
Step 3: at the end of circuit is to the duration of step 2, control the first switching tube closedown, second switch pipe is open-minded, now circuit enters mode III, circuital current passes through from second switch pipe, photovoltaic array is power output not, circuit is in freewheeling state, and the second diode does not exist power loss;
Step 4: requirement PWM controlled according to photovoltaic module MPPT maximum power point tracking and after terminating mode III, control the first switching tube closedown, the closedown of second switch pipe, now circuit again enters the duration and fixes and extremely short mode II, circuital current passes through from the fly-wheel diode of second switch pipe, photovoltaic array is power output not, circuit is in freewheeling state, and the second diode exists power loss; So far, a control cycle of photovoltaic power optimizer is completed;
Step 5: repeat step one to step 4, the sequential arrangement making photovoltaic power optimizer enter mode in each control cycle is followed successively by mode I-mode II-mode III-mode II.
Under malfunction, the first switching tube 6 remains open, and second switch pipe 7 stays open.
In whole control procedure, the existence of mode II is in order to when preventing mode I, III from switching, the first switching tube 6, second switch pipe 7 are opened and caused the of short duration intermediate state of short circuit simultaneously, the prevailing operating state of circuit is based on mode I and mode III, like this, line current i can as far as possible by second switch pipe 7 but not the second diode 9 in afterflow process, reduces line current and flows through the loss that the second diode 9 causes.
The control method of above-mentioned high-efficiency photovoltaic power optimization device series topology circuit, also comprises the rate-determining steps of the 3rd switching tube:
1, judge that the 3rd switching tube belongs to half control type device or wholly-controled device, if half control type device, then keep triggering the conducting of the 3rd switching tube, if wholly-controled device, then enter next step;
When 2, making all optimizers all open, the current value that circuit there will be refluence within the current detecting cycle is the electric current of critical value, testing circuit, decision circuitry electric current, whether higher than this critical value, if so, then controls the 3rd switching tube conducting, if not, then control the 3rd switching tube and disconnect.
For classical Buck circuit existence electric current afterflow process as shown in Figure 1, now freewheel current i flows through diode, because the existence of diode tube pressuring drop causes loss, if and this diode is replaced to the switching tube of subsidiary diode, so in the conducting of electric current freewheeling period, then can there is current reflux problem because of electric current cannot be ensured not interrupted; In the utility model, optimizer component string outlet line has added the 3rd switching tube with the 3rd diode 5, when there is the possibility of refluence in current i or electric current is zero, 3rd switching tube turns off, electric current is flow through by the 3rd diode 5, circuit is made not have diode tube pressuring drop loss when electric current is not interrupted as far as possible, in addition, even if there is diode tube pressuring drop loss, because the summation of the tube voltage drop loss ratio classical Buck fly-wheel diode tube voltage drop loss of the 3rd diode 5 is little, thus increase system efficiency.Control for the 3rd switching tube is to make circuital current as far as possible when circulating by the 3rd switching tube instead of by with the 3rd switching tube and the 3rd diode 5 connect, flow through to reduce circuital current the loss that the 3rd diode 5 causes, but there will not be the situation of electric current adverse current.
Claims (2)
1. a high-efficiency photovoltaic power optimization device series topology circuit, it is characterized in that: comprise photovoltaic array, optimizer, inductance, the output of each photovoltaic array and an optimizer parallel connection, the two ends of all optimizers are connected in series formation optimizer component string successively, described optimizer component string is connected to the input of inverter after inductance, described optimizer comprises the first switching tube, second switch pipe, first diode, second diode and the first electric capacity, described first electric capacity is in parallel with photovoltaic array, the grid access drive circuit of the first switching tube, the drain electrode of the first switching tube is connected with one end of the first electric capacity, the positive pole of the first diode is connected with the source electrode of the first switching tube, the negative pole of the first diode is connected with the drain electrode of the first switching tube, the grid access drive circuit of second switch pipe, the source electrode of second switch pipe is connected with the other end of the first electric capacity, the positive pole of the second diode is connected with the source electrode of second switch pipe, the negative pole of the second diode is connected with the drain electrode of second switch pipe, next optimizer is connected to after the drain electrode of second switch pipe is connected with the source electrode of the first switching tube.
2. high-efficiency photovoltaic power optimization device series topology circuit according to claim 1, it is characterized in that: between described inductance and the input of inverter, be provided with the 3rd switching tube, 3rd switching tube comprises switch and is attempted by the 3rd diode of switch ends, the positive pole of the 3rd diode is connected with inductance, and the negative pole of the 3rd diode is connected with the input of inverter.
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| CN201520852507.XU CN205070786U (en) | 2015-10-30 | 2015-10-30 | High -efficient photovoltaic power optimizer series connection topology circuit |
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|---|---|---|---|
| CN201520852507.XU CN205070786U (en) | 2015-10-30 | 2015-10-30 | High -efficient photovoltaic power optimizer series connection topology circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245101A (en) * | 2015-10-30 | 2016-01-13 | 高海凌 | High-efficiency photovoltaic power optimizer serial topology circuit and control method thereof |
| CN106330088A (en) * | 2016-09-27 | 2017-01-11 | 浙江佳明天和缘光伏科技有限公司 | Three-body photovoltaic power generation direct-current optimizer with direct-through devices |
-
2015
- 2015-10-30 CN CN201520852507.XU patent/CN205070786U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245101A (en) * | 2015-10-30 | 2016-01-13 | 高海凌 | High-efficiency photovoltaic power optimizer serial topology circuit and control method thereof |
| CN106330088A (en) * | 2016-09-27 | 2017-01-11 | 浙江佳明天和缘光伏科技有限公司 | Three-body photovoltaic power generation direct-current optimizer with direct-through devices |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20191030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |