CN102904278A - Distribution type grid connection photovoltaic system power supply - Google Patents

Distribution type grid connection photovoltaic system power supply Download PDF

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Publication number
CN102904278A
CN102904278A CN2012103532294A CN201210353229A CN102904278A CN 102904278 A CN102904278 A CN 102904278A CN 2012103532294 A CN2012103532294 A CN 2012103532294A CN 201210353229 A CN201210353229 A CN 201210353229A CN 102904278 A CN102904278 A CN 102904278A
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China
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photovoltaic
module
energy
power supply
power
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CN2012103532294A
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Chinese (zh)
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赵庆生
于振瑞
纪明友
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江苏万丰光伏有限公司
江苏万宇电能科技有限公司
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Priority to CN2012103532294A priority Critical patent/CN102904278A/en
Publication of CN102904278A publication Critical patent/CN102904278A/en

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    • Y02E10/563

Abstract

The invention relates to the field of photovoltaic products, in particular to a distribution type grid connection photovoltaic system power supply which comprises an intelligent photovoltaic power generation module, a unit high-energy density energy storage module, a bidirectional variable current control module and an intelligent management and control module. The bidirectional variable current control module adopts a direct current-alternating current double-busbar structure, the intelligent photovoltaic power generation module, the unit high-energy density energy storage module, a direct-current load and an auxiliary power supply are all connected onto a direct-current busbar, an alternating current busbar is connected with an alternating current load and a power grid, and the direct-current busbar is connected with the alternating-current busbar through a bidirectional converter. The intelligent management and control module serves as a central manager of a product to detect operation parameters of the modules and regulate the working states of parts and power current in the system. The distribution type grid connection photovoltaic system power supply can operate in a grid connected mode and an isolate mode, can generate power for self use, can perform power transmission with a power grid, can reduce the impact to the power grid and can effectively gain profit by utilizing the peak valley of the power grid.

Description

Distributed grid-connected photovoltaic system power supply

Technical field

The present invention relates to the photovoltaic product scope, specifically a kind of distributed grid-connected photovoltaic system power supply.

Background technology

Solar energy power generating has worldwide obtained rapid promotion and application as one of the project of the heading the list of signers in " new forms of energy " field.Present global photovoltaic installation amount reaches more than the 60GW.Yet, because still being subject to the policies of various countries, photovoltaic application drives, the mounted photovoltaic power generation equipment overwhelming majority all is directly to be connected to the grid, and sells electric mode to electrical network and move.Along with various countries continue to cut down the photovoltaic subsidy, sell electric this photovoltaic application mode profit space to electrical network more and more less; While, photovoltaic generation also can display day by day to the shock effect of electrical network along with the photovoltaic installed capacity continues to increase.In the case, develop a kind of distributed installation, carry energy storage device simultaneously and the photovoltaic product that is incorporated into the power networks just becomes and is necessary very much.Such product meets the developing direction of photovoltaic application, and European Countries photovoltaic rate for incorporation into the power network is significantly cut down, and common electricity price is but in continuous increase, is that business opportunity appears suddenly with the photovoltaic application product of energy storing devices; For Chinese market, national planning 2015 time the volt-ampere loading amount will reach 21GW, wherein distributed power generation just accounts for 10GW; Therefore, distributed grid-connected photovoltaic system product will have great application prospect future in photovoltaic market.

The mode that the conventional common employing of photovoltaic system product with energy storage is not incorporated into the power networks, user's electricity consumption obtain by photovoltaic generation fully, and product does not possess the functions such as Based Intelligent Control yet simultaneously.Among the photovoltaic system product that can be incorporated into the power networks was in the world being developed at present, the technology of each employing was also different, but Related product does not also occur in market.

Summary of the invention

Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of distributed grid-connected photovoltaic system power supply is provided, can be incorporated into the power networks, again can islet operation, can satisfy and generate power for their own use, can pass mutually with grid power again, can reduce the impact to electrical network, can effectively utilize again the peak valley of electrical network to get profit.

The technical scheme that the present invention solves above technical problem is:

Distributed grid-connected photovoltaic system power supply comprises high-energy-density energy-storage module, Bidirectional variable-flow control module and intelligent management and the control module of Intelligent photovoltaic electricity generation module, blocking;

The Bidirectional variable-flow control module adopts the DC-AC double-bus structure, high-energy-density energy-storage module, DC load and the accessory power supply of Intelligent photovoltaic electricity generation module, blocking all are connected on the dc bus, ac bus then links to each other with AC load and electrical network, ac bus is connected to electrical network by net-connected controller, is connected by two way convertor between dc bus and the ac bus;

Two way convertor be incorporated into the power networks with island mode under adopt identical topological structure, namely all adopt the single-phase full-bridge inverter structure, but control strategy is different; Under the pattern of being incorporated into the power networks, inverter adopts PQ control, and what controller was followed the tracks of is the current reference amount, and this moment, the operating state of inverter was the voltage-source type current inversion; Under island mode, inverter adopts Vf control, and what controller was followed the tracks of is voltage reference signal, inverter operating state voltage-source type voltage inversion this moment; Under the pattern of being incorporated into the power networks, link by step-up transformer and electrical network, and under the net pattern, disconnect isolating switch, carry out island protect;

The high-energy-density energy-storage module of Intelligent photovoltaic electricity generation module, blocking, Bidirectional variable-flow control module, DC load, AC load are connected with net-connected controller and are connected with control module with intelligent management, the operational factor that each module that intelligent management and control module adopt micro-control machine collection and storage to be attached thereto sends, and regulate and control the operating state of each module according to operational factor.

Like this, what technical scheme proposed by the invention was different from existing procucts and technology is, what in fact the present invention adopted is the DC side energy storage, this for the efficient that system is provided, to reduce cost be very helpful; Two way convertor be incorporated into the power networks with island mode under adopt identical topological structure, namely all adopt the single-phase full-bridge inverter structure, but control strategy is different; Under the pattern of being incorporated into the power networks, inverter adopts PQ control, and what controller was followed the tracks of is the current reference amount, and this moment, the operating state of inverter was the voltage-source type current inversion; Under isolated island (from net) pattern, inverter adopts the Vf control strategy, and what controller was followed the tracks of is voltage reference signal, inverter operating state voltage-source type voltage inversion this moment; Under the pattern of being incorporated into the power networks, link by step-up transformer and electrical network, and under the net pattern, disconnect isolating switch, carry out island protect.

The information such as power, weather conditions, electric weight, electric network information, load information, fault detect and customer instruction that intelligent management and control module adopt the micro-control machine to gather and storage is sent by other each module, and by the computational analysis of these information being found out optimizer system mode of operation (energy-storage module charging or discharge or holding state; The power that photovoltaic module sends is directly to send load to or sell electricity to energy-storage module charging or to electrical network), then send instruction and detect the operation information of whole system to other module of system.

The technical scheme that the present invention further limits is:

Aforesaid distributed grid-connected photovoltaic system power supply, the high-energy-density energy-storage module of blocking links to each other with dc bus by a Boost-Buck circuit 8, serve as dc auxiliary supply with DC chopped-wave and voltage stabilizing circuit, directly obtain the required operating voltage of intelligent management and control module from dc bus.

Aforesaid distributed grid-connected photovoltaic system power supply, micro-control machine are 51 series monolithics or ARM series monolithic.

Aforesaid distributed grid-connected photovoltaic system power supply, the Intelligent photovoltaic electricity generation module is comprised of the polysilicon photovoltaic module that adopts the encapsulation of Alta-E technology to form, the series connection of polysilicon photovoltaic module forms component string, and component string is connected in parallel and forms described Intelligent photovoltaic electricity generation module.

The Intelligent photovoltaic electricity generation module is comprised of 12 polysilicon photovoltaic modulies that adopt the encapsulation of Alta-E technology to form, these 12 polysilicon photovoltaic modulies are taked the connected mode of " 4 strings 3 also ", be per 43 component string of formation that are in series, then 3 component string are connected in parallel again.The Intelligent photovoltaic electricity generation module adopts the Alta-E technology, the main points of Alta-E technology proposed by the invention have 2 points: the one, by design and the raw-material coupling of optimization component, so that the encapsulation of component power reaches than (Module to cell efficiency) or near 100%, thereby so that generator unit (cell piece) power that is encapsulated among the assembly obtains the maximization performance; The 2nd, adopt unit MPPT maximum power point tracking (MPPT) technology, even thereby so that all power generation plates of system because the setting angle different piece is blocked and born different intensities of illumination, also can be operated in maximum power point separately simultaneously.The Alta-E technology is so that the efficient of photovoltaic generating module and energy output can both reach maximization.

Aforesaid distributed grid-connected photovoltaic system power supply, the high-energy-density energy-storage module of blocking are that an energy-storage units or at least two energy-storage units are formed in parallel; Energy-storage units is comprised of the capacitor type lithium-ions battery battery core of power-type structure; at least two identical described battery core series connection form a battery core string; then at least two described battery core connection in series-parallel are connected to form a complete encapsulation combination; the encapsulation combination is by the control of BMS circuit, protection and a management; and externally send residual capacity information, form the energy-storage units with self-management function.

The high-energy-density energy-storage module of blocking is that an energy-storage units or at least two energy-storage units are formed in parallel; Energy-storage units is comprised of the capacitor type lithium-ions battery battery core of power-type structure; per 15 identical described battery core series connection form a battery core string; then 6 identical described battery core connection in series-parallel are connected to form a complete encapsulation combination; the described encapsulation combination also of this 15 string 6 is passed through the control of BMS circuit, a protection and is managed; and externally send residual capacity information, form the energy-storage units with self-management function.The energy-storage module of high-energy-density adopts a kind of energy-storage module (Flex-ESS:Flexible Energy Storage System) designing technique of flexibility, this technology comprises three main points: the one, and adopt the capacitor type lithium-ions battery that double electric layers supercapacitor is combined with the operation principle of lithium ion battery, the electrode material of the lithium ion battery electrode material with ultracapacitor is merged mutually, and the physics energy storage that forms a kind of existing electric capacity has again the battery of the chemical energy storage of lithium ion battery; The 2nd, the basic enterprising one-step optimization first is taked large capacity energy type core strueture design, so that the encapsulation of battery core is more reliable, (BMS) is simpler for battery management system; The 3rd, with the energy-storage module blocking, combine with some less energy-storage units and to form a jumbo energy-storage module, energy-storage units can increase and decrease according to demand and not affect the work of whole system, thereby forms a kind of energy-storage module (Flex-ESS) of flexibility.

Aforesaid distributed grid-connected photovoltaic system power supply, net-connected controller comprises circuit breaker and the isolating transformer of series connection, ac bus links to each other with electrical network with isolating transformer by the circuit breaker of series connection.

Aforesaid distributed grid-connected photovoltaic system power supply, intelligent management and control module also are provided with following several days weather situation forecast modules, in order to gather following several days mode of operation of weather conditions and anticipation; Described intelligent management and control module also are provided with mixed-media network modules mixed-media, in order to the operating state by network entry inquiry and remote control distributed grid-connected photovoltaic system power supply.Intelligent management and control module have also been possessed according to weather situation forecast in several days future, the function of following several days mode of operation of anticipation; This module also possesses network function simultaneously, and the user can be by the operating state of network entry inquiry and employed this product of remote control.

The invention has the beneficial effects as follows:

The present invention can guarantee that most of photovoltaic generation generates power for their own use, fraction can be sold electrical network, can also buy electricity from electrical network in case of necessity, the user both can use this clean energy resource of solar energy to satisfy self need for electricity, thereby can sell electrical network dump energy again and win profit, can guarantee again simultaneously that (long-term continuously overcast and rainy and batteries to store energy is used up) from the electrical network power taking, really has a continual cleaning green power supply under extreme case.

Distributed grid-connected photovoltaic system power supply of the present invention is compared with product and the disclosed technical scheme of routine, has significant advantage: the distributed control of photovoltaic generating module; Energy-storage module has merged advanced super capacitor and lithium-ions battery technology; Energy conservation and control module have overcome the restriction of conventional control-inversion, possessed Bidirectional variable-flow, be incorporated into the power networks-and islet operation is compatible, the characteristics of intelligent and high-efficiency.

The present invention makes the present invention have the function of Based Intelligent Control and energy management owing to having used intelligent management and control module, has generating and the visual function of power consumption, has wireless energy monitoring and the function of remote system inquiry with management and control.

In a word, the present invention compares with other like product and has stable and reliable operation, intelligent degree is high and makes things convenient for the characteristics of using.

Description of drawings

Fig. 1 is circuit structure diagram of the present invention.

Fig. 2 is the circuit structure diagram of Bidirectional variable-flow control module and intelligent management and control module.

Fig. 3 is the principle assumption diagram of the Intelligent photovoltaic electricity generation module of Alta-E technical configuration.

Fig. 4 is the Boost-Buck circuit principle structure figure between 48V dc energy storage module and the 120V dc bus.

Embodiment

Embodiment 1

The present embodiment provides a kind of distributed grid-connected photovoltaic system power supply, and circuit structure comprises high-energy-density energy-storage module 2, Bidirectional variable-flow control module 3 and intelligent management and the control module 4 of Intelligent photovoltaic electricity generation module 1, blocking as shown in Figure 1;

Bidirectional variable-flow control module 3 adopts the DC-AC double-bus structure, as shown in Figure 2, high-energy-density energy-storage module 2, DC load and the accessory power supply of Intelligent photovoltaic electricity generation module 1, blocking all are connected on the dc bus, ac bus then links to each other with AC load 5 and electrical network 7, ac bus is connected to electrical network 7 by net-connected controller 6, is connected by two way convertor between dc bus and the ac bus.Net-connected controller 6 comprises circuit breaker and the isolating transformer of series connection, and ac bus links to each other with electrical network with isolating transformer by the circuit breaker of series connection.Intelligent photovoltaic electricity generation module 1 is connected to dc bus by a MPPT controller (MPPT maximum power point tracking controller for solar).The high-energy-density energy-storage module 2 of blocking is connected to dc bus by battery management system (BMS).

Two way convertor be incorporated into the power networks with island mode under adopt identical topological structure, namely all adopt the single-phase full-bridge inverter structure, but control strategy is different; Under the pattern of being incorporated into the power networks, inverter adopts PQ control, and what controller was followed the tracks of is the current reference amount, and this moment, the operating state of inverter was the voltage-source type current inversion; Under island mode, inverter adopts Vf control, and what controller was followed the tracks of is voltage reference signal, inverter operating state voltage-source type voltage inversion this moment; Under the pattern of being incorporated into the power networks, link by step-up transformer and electrical network, and under the net pattern, disconnect isolating switch, carry out island protect.

Intelligent management and control module are as shown in Figure 2, the high-energy-density energy-storage module 2 of Intelligent photovoltaic electricity generation module 1, blocking, Bidirectional variable-flow control module 3, DC load, AC load 5 are connected with net-connected controller and all are connected with control module 4 with intelligent management, the operational factor that each module that intelligent management and control module 4 adopts micro-control machine collections and storage to be attached thereto sends, and regulate and control the operating state of each module according to operational factor.Adopt the collection of micro-control machine and storage by the information such as power, weather conditions, electric weight, electric network information, load information, fault detect and customer instruction of other each module transmission, and (energy-storage module charge or discharge or holding state by the computational analysis of these information being found out the optimizer system mode of operation; The power that photovoltaic module sends is directly to send load to or sell electricity to energy-storage module charging or to electrical network), then send instruction and detect the operation information of whole system to other module of system; The micro-control machine can be 51 series monolithics or ARM series monolithic.This module has also possessed according to weather situation forecast in several days future, the function of following several days mode of operation of anticipation.This module also possesses network function simultaneously, and the user can be by the operating state of network entry inquiry and employed this product of remote control.Intelligent management and control module adopt the micro-control machine; being aided with a series of data acquisition, communication and data shows; the protection control circuit; and pass through drive circuit; send instruction to whole system; and drive the data message that display circuit shows necessity, so that the user can clearly understand by display screen history and the immediate status of system product.This module is also connected to the network so that the user can the strange land operating state of inquiry and control a whole set of products.

The high-energy-density energy-storage module 2 of blocking links to each other with dc bus by a Boost-Buck circuit 8, serve as dc auxiliary supply with DC chopped-wave and voltage stabilizing circuit, directly obtain the required operating voltage of intelligent management and control module 4 from dc bus.

As shown in Figure 3, form Intelligent photovoltaic electricity generation module, unit block power 250W, Intelligent photovoltaic electricity generation module gross power 3000W with 12 polysilicon photovoltaic modulies that adopt the encapsulation of Alta-E technology to form.This 12 block assembly is taked the connected mode of " 4 string 3 also ", and namely per 4 are in series and form 3 component string, and then 3 component string are connected in parallel again.These 12 photovoltaic modulies can disperse (such as the diverse location on roof) is installed, and also can install (such as vacant lot, ground) concentratedly.Because each assembly has separately MPPT control function, so even some assembly because of block or angle problem energy output less, but the energy output of whole electricity generation module also can obtain largest optimization.

Adopt the capacitor type lithium-ions battery battery core (single battery core capacity reaches 32Wh) of the power-type structure of 3.2V/10Ah; per 15 identical battery core series connection form one " battery core string "; then 6 identical battery core connection in series-parallel are connected to form a complete encapsulation (pack) combination; the capacity of the pack combination of this " 15 strings 6 also " is 48V/60Ah(2880Wh); control, protect and manage this pack combination by a BMS circuit; and externally send residual capacity information, so just formed " energy-storage units " with self-management function.The present embodiment adopts 3 energy-storage units parallel connections, forms the high-energy-density energy-storage module of the blocking of a 48V/180Ah, and the energy density of the high-energy-density energy-storage module of blocking can be up to 86Wh/kg, 200KWh/m 3

The Bidirectional variable-flow control module of the embodiment of the invention adopts 120V dc bus and 220V/50Hz ac bus structure.48V dc energy storage module links to each other with dc bus by a Boost-Buck circuit, as shown in Figure 4.Serve as dc auxiliary supply with DC chopped-wave and voltage stabilizing circuit, directly obtain the required operating voltage of control circuit from dc bus.Two way convertor adopts the single inverter structure that can compatible be incorporated into the power networks with islet operation.Under the pattern of being incorporated into the power networks, inverter adopts PQ control, and what controller was followed the tracks of is the current reference amount, and this moment, the operating state of inverter was the voltage-source type current inversion.Under net (isolated island) pattern, inverter adopts the Vf control strategy, and what controller was followed the tracks of is voltage reference signal, inverter operating state voltage-source type voltage inversion this moment.And the topological structure of the inverter under two kinds of mode of operations all is the same, all adopts the single-phase full-bridge inverter structure.Under the pattern of being incorporated into the power networks, link by step-up transformer and electrical network, and under the net pattern, disconnect isolating switch, carry out island protect.

The embodiment of the invention can adopt the design of integrated product design, namely the Intelligent photovoltaic electricity generation module be installed in outdoor outside, all the other all modules all are integrated in the casing, box shape is of a size of 1600 * 810 * 550 mm, the front is display screen.

The setting of the concrete technical parameter of each module and a whole set of products is not the unique content of wanting the present invention's protection in the present embodiment, and in addition to the implementation, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.

Claims (9)

1. distributed grid-connected photovoltaic system power supply is characterized in that: high-energy-density energy-storage module (2), Bidirectional variable-flow control module (3) and the intelligent management and the control module (4) that comprise Intelligent photovoltaic electricity generation module (1), blocking;
Described Bidirectional variable-flow control module (3) adopts the DC-AC double-bus structure, high-energy-density energy-storage module (2), DC load and the accessory power supply of described Intelligent photovoltaic electricity generation module (1), blocking all are connected on the dc bus, ac bus then links to each other with AC load (5) and electrical network (7), ac bus is connected to electrical network (7) by net-connected controller (6), is connected by two way convertor between dc bus and the ac bus;
Two way convertor be incorporated into the power networks with island mode under adopt identical topological structure, namely all adopt the single-phase full-bridge inverter structure, but control strategy is different; Under the pattern of being incorporated into the power networks, inverter adopts PQ control, and what controller was followed the tracks of is the current reference amount, and this moment, the operating state of inverter was the voltage-source type current inversion; Under island mode, inverter adopts Vf control, and what controller was followed the tracks of is voltage reference signal, inverter operating state voltage-source type voltage inversion this moment; Under the pattern of being incorporated into the power networks, link by step-up transformer and electrical network, and under the net pattern, disconnect isolating switch, carry out island protect;
The high-energy-density energy-storage module (2) of described Intelligent photovoltaic electricity generation module (1), blocking, Bidirectional variable-flow control module (3), DC load, AC load (5) are connected 6 with net-connected controller) all be connected with control module (4) with described intelligent management, the operational factor that each module that described intelligent management and control module (4) adopt micro-control machine collection and storage to be attached thereto sends, and regulate and control the operating state of each module according to operational factor.
2. distributed grid-connected photovoltaic system power supply as claimed in claim 1, it is characterized in that: the high-energy-density energy-storage module (2) of described blocking links to each other with described dc bus by a Boost-Buck circuit (8), serve as dc auxiliary supply with DC chopped-wave and voltage stabilizing circuit, directly obtain the required operating voltage of intelligent management and control module (4) from dc bus.
3. distributed grid-connected photovoltaic system power supply as claimed in claim 1 or 2, it is characterized in that: described micro-control machine is 51 series monolithics or ARM series monolithic.
4. distributed grid-connected photovoltaic system power supply as claimed in claim 1 or 2, it is characterized in that: described Intelligent photovoltaic electricity generation module is comprised of the polysilicon photovoltaic module that adopts the encapsulation of Alta-E technology to form, the series connection of polysilicon photovoltaic module forms component string, and component string is connected in parallel and forms described Intelligent photovoltaic electricity generation module.
5. distributed grid-connected photovoltaic system power supply as claimed in claim 4, it is characterized in that: described Intelligent photovoltaic electricity generation module is comprised of 12 polysilicon photovoltaic modulies that adopt the encapsulation of Alta-E technology to form, these 12 polysilicon photovoltaic modulies are taked the connected mode of " 4 strings 3 also ", be per 43 component string of formation that are in series, then 3 component string are connected in parallel again.
6. distributed grid-connected photovoltaic system power supply as claimed in claim 1 or 2, it is characterized in that: the high-energy-density energy-storage module of described blocking is that an energy-storage units or at least two energy-storage units are formed in parallel; Described energy-storage units is comprised of the capacitor type lithium-ions battery battery core of power-type structure; at least two identical described battery core series connection form a battery core string; then at least two described battery core connection in series-parallel are connected to form a complete encapsulation combination; described encapsulation combination is by the control of BMS circuit, protection and a management; and externally send residual capacity information, form the energy-storage units with self-management function.
7. distributed grid-connected photovoltaic system power supply as claimed in claim 6; it is characterized in that: described energy-storage units is comprised of the capacitor type lithium-ions battery battery core of power-type structure; per 15 identical described battery core series connection form a battery core string; then 6 identical described battery core connection in series-parallel are connected to form a complete encapsulation combination; the described encapsulation combination also of this 15 string 6 is passed through the control of BMS circuit, a protection and is managed; and externally send residual capacity information, form the energy-storage units with self-management function.
8. distributed grid-connected photovoltaic system power supply as claimed in claim 1 or 2, it is characterized in that: described net-connected controller (6) comprises circuit breaker and the isolating transformer of series connection, ac bus links to each other with electrical network with isolating transformer by the circuit breaker of series connection.
9. distributed grid-connected photovoltaic system power supply as claimed in claim 1 or 2, it is characterized in that: described intelligent management and control module (4) also are provided with following several days weather situation forecast modules, in order to gather following several days mode of operation of weather conditions and anticipation; Described intelligent management and control module also are provided with mixed-media network modules mixed-media, in order to the operating state by network entry inquiry and remote control distributed grid-connected photovoltaic system power supply.
CN2012103532294A 2012-09-20 2012-09-20 Distribution type grid connection photovoltaic system power supply CN102904278A (en)

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