CN203504493U - Intelligent self-balance photovoltaic series battery assembly - Google Patents

Abstract

The utility model discloses an intelligent self-balance photovoltaic series battery assembly. The intelligent self-balance photovoltaic series battery assembly comprises a series battery assembly, a distributed balance optimization circuit, a control circuit and a sampling circuit, the series battery assembly, the sampling circuit, the control circuit and the distributed balance optimization circuit are connected in sequence, the distributed balance optimization circuit is connected with the sampling circuit, and an assembly leading-out wire is led out from the distributed balance optimization circuit to connect an external assembly. According to the intelligent self-balance photovoltaic series battery assembly, the distributed self-balance optimization circuit is additionally provided aiming to a series photovoltaic battery set, the maximum efficiency conversion of a slave photovoltaic battery, an optimization circuit and a grid-connected inversion circuit is achieved, the existing circuit can be conducted in a reverse direction, the follow current ability in the reverse direction is improved, and the service lifetime of the photovoltaic battery assembly can be extended, and the reliability of the photovoltaic battery assembly can be improved.

Description

A kind of Intelligent self-balancing photovoltaic series connection battery component

Technical field

The utility model relates to solar photovoltaic battery component field, relates in particular to a kind of Intelligent self-balancing photovoltaic series connection battery component.

Background technology

At present, the operation time limit of photovoltaic generating system is generally all designed to 15 years, and the life-span of photovoltaic cell component is longer general over 25 years, wishes to bring into play maximum effect in its life cycle.And in actual light photovoltaic generating system, photovoltaic cell decline (degenerating with 0.5%-1% every year) and external environment factor (photovoltaic shade blocks) in time makes output voltage, current mismatch between photovoltaic module or assembly, thereby causes the generating efficiency of photovoltaic module and life-span to decline.Research now shows, because the own lack of uniformity of photovoltaic cell (RP is different, comprising: material, encapsulation technology and optical loss) causes the loss in efficiency that causes of photovoltaic module mismatch to be about 10%～15%.And photovoltaic shade in installation environment blocks, not only make the inner serious mismatch of photovoltaic module, and the thermal dissipation that makes by-pass diode makes photovoltaic module performance accelerate to degenerate, to photovoltaic module, bring many as problems such as power output sharply reduces, " hot spot effect ", MPPT maximum power point tracking (Maximum Power Point Tracking, MPPT) technical failures.From the application in the grid-connected power station of reality, in photovoltaic system, the photovoltaic problem of sheltering from heat or light can cause photovoltaic efficiency lower than theoretical value 15%-20%, for example, in a photovoltaic photovoltaic plant, nearly 10% cell panel is blocked by shade, under extreme case, can cause the power loss of photovoltaic plant 60%, the power loss on average causing is in 30% left and right.Simultaneously long-time shade blocks bypass diode overcurrent, excess temperature infringement and the life-span reduction that can cause, serious meeting causes photovoltaic battery panel to burn, and causes fire.Therefore, the output of the voltage and current mismatch of balance photovoltaic module is to improve the more direct effective method of photovoltaic system utilization ratio.

Utility model content

For the problem of above-mentioned existence, the purpose of this utility model is to provide a kind of Intelligent self-balancing photovoltaic series connection battery component, with series battery output voltage, current mismatch in balance photovoltaic module, improves photovoltaic system utilization ratio.

The purpose of this utility model is achieved through the following technical solutions:

A kind of Intelligent self-balancing photovoltaic series connection battery component, comprise series-connected cell assembly, wherein, also comprise distributed balance optimizing circuit, control circuit and sample circuit, described series-connected cell assembly, described sample circuit, described control circuit and described distributed balance optimizing circuit are connected successively, described distributed balance optimizing circuit is connected with described sample circuit, involves assembly lead-out wire to connect external module on described distributed balance optimizing circuit.

Above-mentioned Intelligent self-balancing photovoltaic series connection battery component, wherein said distributed balance optimizing circuit comprises the first electric capacity and the power tube equating with number of batteries in described series-connected cell assembly respectively, the two ends of described the first electric capacity and the two ends of described power tube respectively with corresponding connection of each battery in described series-connected cell assembly, and between described the first electric capacity, be mutually connected in series, between described power tube, be mutually connected in series; Cross-over connection one transformer between the first electric capacity and described power tube described in every two adjacent groups; Described series-connected cell assembly is also with one second electric capacity and connect.

Above-mentioned Intelligent self-balancing photovoltaic series connection battery component, wherein, described in each, power tube is managed corresponding anti-paralleled diode by a NMOS pipe and with described NMOS and is formed.

Compared with the prior art, the beneficial effects of the utility model are:

For series connection photovoltaic cell group, increased a distributed self-balancing optimized circuit, can realize from photovoltaic cell, the maximal efficiency of balance optimizing circuit and grid-connected inverter circuit transforms, simultaneous circuit also can reverse-conducting, increase reverse afterflow ability, can improve the life and reliability of photovoltaic cell component.

Accompanying drawing explanation

Fig. 1 is the structural representation block diagram of the utility model Intelligent self-balancing photovoltaic series connection battery component;

Fig. 2 is the structural representation of the distributed balance optimizing circuit of the utility model Intelligent self-balancing photovoltaic series connection battery component;

Fig. 3 is the control logic schematic diagram of the control circuit of the utility model Intelligent self-balancing photovoltaic series connection battery component.

Embodiment

Below in conjunction with schematic diagram and concrete operations embodiment, the utility model is described in further detail.

As shown in Figure 1, the utility model Intelligent self-balancing photovoltaic series connection battery component comprises series-connected cell assembly 1, distributed balance optimizing circuit 2, control circuit 4 and sample circuit 5, series-connected cell assembly 1, sample circuit 5, control circuit 4 and distributed balance optimizing circuit 2 are connected successively, distributed balance optimizing circuit 2 is connected with sample circuit 5, involves assembly lead-out wire 3 to connect external module on distributed balance optimizing circuit 2.

Distributed balance optimizing circuit 2 comprises the first electric capacity and the power tube equating with number of batteries in series-connected cell assembly 1 respectively, the two ends of the first electric capacity and the two ends of power tube respectively with corresponding connection of each battery in series-connected cell assembly 1, and between the first electric capacity, be mutually connected in series, between power tube, be mutually connected in series.Cross-over connection one transformer between every two adjacent groups the first electric capacity and power tube, series-connected cell assembly 1 is also with one second electric capacity and connect.

Each power tube is managed corresponding anti-paralleled diode by a NMOS pipe and with NMOS and is formed, and the source electrode of NMOS pipe is connected with the positive pole of diode, and the drain electrode of NMOS pipe is connected with the negative pole of diode.

In the utility model preferred embodiment, the first electric capacity is three, is respectively C ₁, C ₂and C ₃, power tube also has three, is respectively T ₁, T ₂and T ₃, cross-over connection one transformer between every two adjacent groups the first electric capacity and power tube, is respectively L ₁and L ₂, series-connected cell assembly 1 also with the second capacitor C _dcand connect.

As shown in Figure 2, when photovoltaic string joint group uneven illumination weighing apparatus, during electric current and voltage mismatch, C ₁, C ₂and C ₃on voltage also uneven.

First T ₁pipe work, C ₁, T ₁and L ₁the work of former limit, electric current is from C ₁flow to L ₁former limit, due to L ₁coupling, L ₁the electric current of secondary passes through T ₃the diode-built-in conducting of pipe is to C ₃charging.

Work as T ₂during conducting work, C ₂, T ₂and L ₂the work of former limit, electric current is from C ₂flow to L ₂former limit, due to L ₂coupling, L ₂the electric current of secondary passes through T ₃the diode-built-in conducting of pipe is to C ₃charging.

Work as T ₃during conducting work, C ₃, T ₃with L1 and L ₂secondary work, electric current is from C ₃flow to L ₁and L ₂secondary, due to L ₁and L ₂coupling, L ₁the electric current on former limit passes through T ₁the diode-built-in conducting of pipe is to C ₁charging, L ₂the electric current on former limit passes through T ₂the diode-built-in conducting of pipe is to C ₂charging, and C _dcthe effect of electric capacity is to keep whole output voltage stabilization.

Three switching element T in circuit like this ₁, T ₂and T ₃after conducting, electric current and voltage checks and balance, and reaches the effect of self-balancing, automatically adjusts each photovoltaic cell output voltage and function of current, makes each series-connected cell assembly 1 Maximum Power Output in electric current and voltage mismatch situation.

Please refer to shown in Fig. 3, the control logic of the control circuit in the utility model preferred embodiment is:

First detect C ₁, C ₂and C ₃on voltage, be respectively V ₁, V ₂and V ₃, these three voltage swings are sorted;

If V ₁>V ₂>V ₃, three switching element T ₁, T ₂and T ₃duty ratio be respectively ${\stackrel{\&OverBar;}{D}}_1=\frac{V_1}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_2=\frac{V_2+\frac{V_1-V_3}{3}}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_1=1-{\stackrel{\&OverBar;}{D}}_1-{\stackrel{\&OverBar;}{D}}_2;$

If V ₁>V ₃>V ₂, three switching element T ₁, T ₂and T ₃duty ratio be respectively ${\stackrel{\&OverBar;}{D}}_1=\frac{V_1}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_3=\frac{V_3+\frac{V_1-{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2}{3}}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_1=1-{\stackrel{\&OverBar;}{D}}_1-{\stackrel{\&OverBar;}{D}}_2;$

If V ₂>V ₁>V ₃, three switching element T ₁, T ₂and T ₃duty ratio be respectively ${\stackrel{\&OverBar;}{D}}_2=\frac{V_2}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_1=\frac{V_1+\frac{V_2-V_3}{3}}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_3=1-{\stackrel{\&OverBar;}{D}}_1-{\stackrel{\&OverBar;}{D}}_2;$

If V ₂>V ₃>V ₁, three switching element T ₁, T ₂and T ₃duty ratio be respectively ${\stackrel{\&OverBar;}{D}}_2=\frac{V_2}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_3=\frac{V_1+\frac{V_2-{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_1}{3}}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_1=1-{\stackrel{\&OverBar;}{D}}_1-{\stackrel{\&OverBar;}{D}}_2;$

If V ₃>V ₂>V ₁, three switching element T ₁, T ₂and T ₃duty ratio be respectively ${\stackrel{\&OverBar;}{D}}_3=\frac{V_3}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_2=\frac{V_2+\frac{V_3-{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_1}{3}}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_1=1-{\stackrel{\&OverBar;}{D}}_1-{\stackrel{\&OverBar;}{D}}_2;$

If V ₃>V ₁>V ₂, three switching element T ₁, T ₂and T ₃duty ratio be respectively ${\stackrel{\&OverBar;}{D}}_3=\frac{V_3}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_1=\frac{V_2+\frac{V_3-{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2}{3}}{V_1+{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HDA00003729431100021.png"\; state="\{\{state\}\}">V</figure-callout>}}_2+V_3},$ ${\stackrel{\&OverBar;}{D}}_2=1-{\stackrel{\&OverBar;}{D}}_1-{\stackrel{\&OverBar;}{D}}_2.$

The utility model is for series connection photovoltaic cell group, increased a distributed self-balancing optimized circuit, can realize from photovoltaic cell, the maximal efficiency of balance optimizing circuit and grid-connected inverter circuit transforms, simultaneous circuit also can reverse-conducting, increase reverse afterflow ability, can improve the life and reliability of photovoltaic cell component.

Above specific embodiment of the utility model be have been described in detail, but the utility model is not restricted to specific embodiment described above, it is just as example.To those skilled in the art, any equivalent modifications and alternative also all among category of the present utility model.Therefore,, not departing from the equalization conversion of having done under spirit and scope of the present utility model and revising, all should be encompassed in scope of the present utility model.

Claims (3)

1. Intelligent self-balancing photovoltaic series connection battery component, comprise series-connected cell assembly, it is characterized in that, also comprise distributed balance optimizing circuit, control circuit and sample circuit, described series-connected cell assembly, described sample circuit, described control circuit and described distributed balance optimizing circuit are connected successively, described distributed balance optimizing circuit is connected with described sample circuit, involves assembly lead-out wire to connect external module on described distributed balance optimizing circuit.

2. Intelligent self-balancing photovoltaic series connection battery component according to claim 1, it is characterized in that, described distributed balance optimizing circuit comprises the first electric capacity and the power tube equating with number of batteries in described series-connected cell assembly respectively, the two ends of described the first electric capacity and the two ends of described power tube respectively with corresponding connection of each battery in described series-connected cell assembly, and between described the first electric capacity, be mutually connected in series, between described power tube, be mutually connected in series; Cross-over connection one transformer between the first electric capacity and described power tube described in every two adjacent groups; Described series-connected cell assembly is also with one second electric capacity and connect.

3. Intelligent self-balancing photovoltaic series connection battery component according to claim 2, is characterized in that, described in each, power tube is managed corresponding anti-paralleled diode by a NMOS pipe and with described NMOS and formed.

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