CN204334004U - A kind of photovoltaic generating system charge-discharge circuit - Google Patents
A kind of photovoltaic generating system charge-discharge circuit Download PDFInfo
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- CN204334004U CN204334004U CN201420729960.7U CN201420729960U CN204334004U CN 204334004 U CN204334004 U CN 204334004U CN 201420729960 U CN201420729960 U CN 201420729960U CN 204334004 U CN204334004 U CN 204334004U
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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 kind of photovoltaic generating system charge-discharge circuit, comprise solar module, filter circuit of pressure-stabilizing, DC/DC translation circuit and overcharge protection circuit.Utility model proposes a kind of novel charge-discharge circuit topology, adopts dynamic power tracking and matching method to be controlled, namely poor according to realtime power, dynamically mates the storage battery number of discharge and recharge, namely dynamically transformation system structure, thus realizes best discharge and recharge.Compared with conventional photovoltaic system, native system flexible operation, high efficient and reliable, bulk life time is improved; Another very large advantage is, easily carry out scale expansion, easily realize modular system integrated, storage battery institute's problems faced in current photovoltaic generating system can be solved preferably, because battery group capacity can change flexibly, so, when needing expansion scale, only need increase photovoltaic battery panel, increase DC/DC converter number in parallel, increase charge in batteries unit, change control software design program.
Description
Technical field
The utility model relates to a kind of photovoltaic generating system, specifically a kind of photovoltaic generating system charge-discharge circuit.
Background technology
In independent solar electricity generation system, in order to reduce costs, raise the efficiency and reliability, photovoltaic cell Maximum Power Output should be made, make the correct discharge and recharge of storage battery again, also will maximally utilise generated electricity energy simultaneously.In current photovoltaic system, there is contradiction in the realization of this three, usually just thinks of an aspect, abandons the best discharge and recharge of storage battery, thus limit efficiency and the life-span of system as only followed the trail of maximum power of photovoltaic cell point.
Utility model content
The purpose of this utility model is the photovoltaic generating system charge-discharge circuit providing a kind of efficient discharge and recharge, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of photovoltaic generating system charge-discharge circuit; comprise solar module, filter circuit of pressure-stabilizing, DC/DC translation circuit and overcharge protection circuit; described filter circuit of pressure-stabilizing connects solar module and DC/DC translation circuit respectively; DC/DC translation circuit also connects load and multiple overcharge protection circuit respectively; each overcharge protection circuit also connects two-way DC/DC circuit, and each two-way DC/DC circuit other end all connects storage battery.
As the utility model further scheme: described two-way DC/DC circuit comprises transformer T, electric capacity C1, electric capacity C2, metal-oxide-semiconductor Q1 and inductance L 3, electric capacity C1 one end connects diode D1 negative pole respectively, the D pole of input Vi+ and metal-oxide-semiconductor Q1, the electric capacity C1 other end connects electric capacity C2 and transformer T coil L1 respectively, and the electric capacity C2 other end connects diode D2 positive pole respectively, the D pole of metal-oxide-semiconductor Q2 and input Vi-, the S pole difference connection transformer T coil L1 other end of metal-oxide-semiconductor Q2 and the S pole of metal-oxide-semiconductor Q1, transformer T coil L2 one end connects the S pole of metal-oxide-semiconductor Q3 and the S pole of metal-oxide-semiconductor Q4 respectively, and the D pole of metal-oxide-semiconductor Q3 connects diode D3 negative pole respectively, electric capacity C3, electric capacity C5, resistance R1, the D pole of diode D5 negative pole and metal-oxide-semiconductor Q5, diode D3 cathode connecting diode D4 negative pole, diode D4 positive pole connects the D pole of metal-oxide-semiconductor Q4 respectively, electric capacity C4, the electric capacity C5 other end, the resistance R1 other end, the S pole of diode D6 positive pole and metal-oxide-semiconductor Q6, electric capacity C6 and output end vo-ground connection, the electric capacity C4 other end connects the electric capacity C3 other end and the transformer T coil L2 other end respectively, and described diode D6 negative pole connects the D pole of metal-oxide-semiconductor Q6 respectively, the S pole of metal-oxide-semiconductor Q5, diode D5 positive pole and inductance L 3, inductance L 3 other end connect respectively the electric capacity C6 other end and output end vo+.
Compared with prior art, the beneficial effects of the utility model are: the utility model proposes a kind of novel charge-discharge circuit topology, dynamic power tracking and matching method is adopted to be controlled, namely poor according to realtime power, dynamically mate the battery capacity (storage battery number) of discharge and recharge, namely dynamically transformation system structure, thus realize best discharge and recharge.Compared with conventional photovoltaic system, native system flexible operation, high efficient and reliable, bulk life time is improved; Another very large advantage is, easily carry out scale expansion, easily realize modular system integrated, storage battery institute's problems faced in current photovoltaic generating system can be solved preferably, because battery group capacity can change flexibly, so, when needing expansion scale, only need increase photovoltaic battery panel, increase DC/DC converter number in parallel, increase charge in batteries unit, change control software design program.
Accompanying drawing explanation
Fig. 1 is a kind of structured flowchart of photovoltaic generating system charge-discharge circuit;
Fig. 2 is the circuit diagram of two-way DC/DC circuit in a kind of photovoltaic generating system charge-discharge circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1 ~ 2; in the utility model embodiment; a kind of photovoltaic generating system charge-discharge circuit; comprise solar module, filter circuit of pressure-stabilizing, DC/DC translation circuit and overcharge protection circuit; filter circuit of pressure-stabilizing connects solar module and DC/DC translation circuit respectively; DC/DC translation circuit also connects load and multiple overcharge protection circuit respectively, and each overcharge protection circuit also connects two-way DC/DC circuit, and each two-way DC/DC circuit other end all connects storage battery.
Two-way DC/DC circuit comprises transformer T, electric capacity C1, electric capacity C2, metal-oxide-semiconductor Q1 and inductance L 3, electric capacity C1 one end connects diode D1 negative pole respectively, the D pole of input Vi+ and metal-oxide-semiconductor Q1, the electric capacity C1 other end connects electric capacity C2 and transformer T coil L1 respectively, and the electric capacity C2 other end connects diode D2 positive pole respectively, the D pole of metal-oxide-semiconductor Q2 and input Vi-, the S pole difference connection transformer T coil L1 other end of metal-oxide-semiconductor Q2 and the S pole of metal-oxide-semiconductor Q1, transformer T coil L2 one end connects the S pole of metal-oxide-semiconductor Q3 and the S pole of metal-oxide-semiconductor Q4 respectively, and the D pole of metal-oxide-semiconductor Q3 connects diode D3 negative pole respectively, electric capacity C3, electric capacity C5, resistance R1, the D pole of diode D5 negative pole and metal-oxide-semiconductor Q5, diode D3 cathode connecting diode D4 negative pole, diode D4 positive pole connects the D pole of metal-oxide-semiconductor Q4 respectively, electric capacity C4, the electric capacity C5 other end, the resistance R1 other end, the S pole of diode D6 positive pole and metal-oxide-semiconductor Q6, electric capacity C6 and output end vo-ground connection, the electric capacity C4 other end connects the electric capacity C3 other end and the transformer T coil L2 other end respectively, and diode D6 negative pole connects the D pole of metal-oxide-semiconductor Q6 respectively, the S pole of metal-oxide-semiconductor Q5, diode D5 positive pole and inductance L 3, inductance L 3 other end connect respectively the electric capacity C6 other end and output end vo+.
Refer to Fig. 2, the maximum power point voltage of photovoltaic cell, electric current are change in different situations, so, when load is constant, just need system to regulate charging current to coordinate tracing maximum power of photovoltaic cell simultaneously, maximum power of photovoltaic cell could be realized like this and export.In order to realize carrying out best discharge and recharge to storage battery when maximum power of photovoltaic cell exports, after load is determined, controller is the equidirectional duty ratio D adjusting DC/DC translation circuit and charger simultaneously, realizes optimal charge, also makes the storage battery of electric discharge by optimal discharge current discharge.Run on the prerequisite of maximum power point at photovoltaic cell under, system solution comprises:
1) the most ceiling value of specified loads, ensures that storage battery can complete the independent power supply at night or cloudy day.
2), during charging, regulate photovoltaic working point to follow the tracks of DC/DC translation circuit and two-way DC/DC circuit simultaneously, dynamically determined to need charging accumulator number by it;
3) during electric discharge, the maximum difference of photovoltaic power output and bearing power to be judged equally, determine with this storage battery number participating in electric discharge;
4) discharge and recharge all will maintain the best charge and discharge mode of storage battery.
System discharge and recharge flow process is as follows: before discharge and recharge, the storage battery of fullcharging electricity and the discharge and recharge that has been unlocked removes by controller from carrying capacity sequence, then how many all the other batteries to be arranged according to each storage battery is charged, carrying capacity is discontented with and exposed maximum storage battery Bmax as the battery of first charging, then determine the order that charges successively.Charger first charges from first, namely first first charger is carried out cooperation control together with DC/DC translation circuit.When the charging current of first charger reaches the optimal charge electric current of its storage battery, proceed to protection charge mode, start to carry out constant current charge to it.Reach hydrolysis voltage at accumulator voltage and (be generally 2.3V/ monomer; just start to occur battery acid liquid hydrolysis phenomena higher than this value) time, transfer constant voltage protection charging to, and temperature-compensating is carried out to overcharged voltage value; temperature compensation coefficient gets-4mV/ DEG C, until be full of.Then open second charger according to above-mentioned said method, added to by control queue, the like.Each charger of controller coordinate, under making it be in optimal charge pattern all as far as possible, and be full of by the storage battery first charged as far as possible, discharge process is similar to charging process.After all accumulator voltages arrive the final discharging voltage arranged, stop electric discharge at once, avoid overdischarge occurs.
Claims (2)
1. a photovoltaic generating system charge-discharge circuit; comprise solar module, filter circuit of pressure-stabilizing, DC/DC translation circuit and overcharge protection circuit; it is characterized in that; described filter circuit of pressure-stabilizing connects solar module and DC/DC translation circuit respectively; DC/DC translation circuit also connects load and multiple overcharge protection circuit respectively; each overcharge protection circuit also connects two-way DC/DC circuit, and each two-way DC/DC circuit other end all connects storage battery.
2. photovoltaic generating system charge-discharge circuit according to claim 1, is characterized in that, described two-way DC/DC circuit comprises transformer T, electric capacity C1, electric capacity C2, metal-oxide-semiconductor Q1 and inductance L 3, electric capacity C1 one end connects diode D1 negative pole respectively, the D pole of input Vi+ and metal-oxide-semiconductor Q1, the electric capacity C1 other end connects electric capacity C2 and transformer T coil L1 respectively, and the electric capacity C2 other end connects diode D2 positive pole respectively, the D pole of metal-oxide-semiconductor Q2 and input Vi-, the S pole difference connection transformer T coil L1 other end of metal-oxide-semiconductor Q2 and the S pole of metal-oxide-semiconductor Q1, transformer T coil L2 one end connects the S pole of metal-oxide-semiconductor Q3 and the S pole of metal-oxide-semiconductor Q4 respectively, and the D pole of metal-oxide-semiconductor Q3 connects diode D3 negative pole respectively, electric capacity C3, electric capacity C5, resistance R1, the D pole of diode D5 negative pole and metal-oxide-semiconductor Q5, diode D3 cathode connecting diode D4 negative pole, diode D4 positive pole connects the D pole of metal-oxide-semiconductor Q4 respectively, electric capacity C4, the electric capacity C5 other end, the resistance R1 other end, the S pole of diode D6 positive pole and metal-oxide-semiconductor Q6, electric capacity C6 and output end vo-ground connection, the electric capacity C4 other end connects the electric capacity C3 other end and the transformer T coil L2 other end respectively, and described diode D6 negative pole connects the D pole of metal-oxide-semiconductor Q6 respectively, the S pole of metal-oxide-semiconductor Q5, diode D5 positive pole and inductance L 3, inductance L 3 other end connect respectively the electric capacity C6 other end and output end vo+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420729960.7U CN204334004U (en) | 2014-11-29 | 2014-11-29 | A kind of photovoltaic generating system charge-discharge circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420729960.7U CN204334004U (en) | 2014-11-29 | 2014-11-29 | A kind of photovoltaic generating system charge-discharge circuit |
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| CN204334004U true CN204334004U (en) | 2015-05-13 |
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| CN201420729960.7U Expired - Fee Related CN204334004U (en) | 2014-11-29 | 2014-11-29 | A kind of photovoltaic generating system charge-discharge circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109599934A (en) * | 2018-12-27 | 2019-04-09 | 哈尔滨工业大学（深圳） | Multiport power cell expandable type photovoltaic charger |
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2014
- 2014-11-29 CN CN201420729960.7U patent/CN204334004U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109599934A (en) * | 2018-12-27 | 2019-04-09 | 哈尔滨工业大学（深圳） | Multiport power cell expandable type photovoltaic charger |
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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: 20150513 Termination date: 20151129 |