CN108281952A - Photovoltaic power supply system and its method for controlling power supply - Google Patents
Photovoltaic power supply system and its method for controlling power supply Download PDFInfo
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- CN108281952A CN108281952A CN201810138358.9A CN201810138358A CN108281952A CN 108281952 A CN108281952 A CN 108281952A CN 201810138358 A CN201810138358 A CN 201810138358A CN 108281952 A CN108281952 A CN 108281952A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000005611 electricity Effects 0.000 claims abstract description 48
- 238000004146 energy storage Methods 0.000 claims description 23
- 238000010248 power generation Methods 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 14
- 238000004378 air conditioning Methods 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000005286 illumination Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 17
- 230000001052 transient effect Effects 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 7
- 230000003139 buffering effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000003252 repetitive effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 235000021061 dietary behavior Nutrition 0.000 description 3
- 235000006694 eating habits Nutrition 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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
Abstract
The invention discloses a kind of photovoltaic power supply system and its method for controlling power supply.Wherein, which includes：At least one electrical equipment, photovoltaic power supply device, network system, and for the buffer unit being adjusted with the energy input of at least one of electricity condition, the photovoltaic power supply device and network system or output state at least one electrical equipment；At least one electrical equipment, photovoltaic power supply device and network system access DC bus；The buffer unit accesses the DC bus, and is connect at least one of at least one electrical equipment, photovoltaic power supply device and network system.The present invention solves in the related technology, including easily leads to the unstable technical problem of system in more power supplys and/or multi-load when load or power supply switch in and out suddenly.
Description
Technical field
The present invention relates to photovoltaic power supply fields, in particular to a kind of photovoltaic power supply system and its method for controlling power supply.
Background technology
In the related technology, in the system including more power supplys and/or multi-load, may occur loading at random or energy
Source (such as power supply) switches in and out situation, especially when occurring above-mentioned fortuitous event suddenly, certain loads or energy source
Suddenly when cutting or cutting out, whole system will will appear unstable, in fact it could happen that performance is unstable, even results in and pacifies
It is complete dangerous.
For above-mentioned problem, currently no effective solution has been proposed.
Invention content
An embodiment of the present invention provides a kind of photovoltaic power supply system and its method for controlling power supply, at least to solve the relevant technologies
In, including the unstable technology of system is easily led in more power supplys and/or multi-load when load or power supply switch in and out suddenly
Problem.
One side according to the ... of the embodiment of the present invention provides a kind of photovoltaic power supply system, including：At least one electricity consumption is set
Standby, photovoltaic power supply device, network system, and for supplying at least one electrical equipment electricity condition, the photovoltaic
The buffer unit that the energy input or output state of at least one of electric installation and network system are adjusted；It is described at least one
Electrical equipment, photovoltaic power supply device and network system access DC bus；The buffer unit accesses the DC bus, and
It is connect at least one of at least one electrical equipment, photovoltaic power supply device and network system.
Optionally, the buffer unit includes：Energy-storage battery for the power capacity for extending the DC bus, with institute
State DC bus connection.
Optionally, the buffer unit further includes：First stable-pressure device, setting are female in the energy-storage battery and the direct current
Between line.
Optionally, first stable-pressure device includes：First DC to DC (DC/DC) Switching Power Supply.
Optionally, at least one electrical equipment includes：First DC load and the second DC load, wherein described
The operating voltage of first DC load is more than the operating voltage of second DC load；The buffer unit includes：Second is steady
Pressure device is arranged between first DC load and the DC bus, for adjusting the defeated of first DC load
Enter voltage；Third stable-pressure device is arranged between second DC load and the DC bus, for adjusting described second
The input voltage of DC load.
Optionally, second stable-pressure device includes：Controller；And/or the third stable-pressure device includes：2nd DC/
DC Switching Power Supplies.
Optionally, the buffer unit further includes：4th stable-pressure device, setting is in the photovoltaic power supply device and described straight
Between flowing busbar, the output voltage for adjusting the photovoltaic power supply device.
Optionally, the buffer unit further includes：5th stable-pressure device, setting are female in the network system and the direct current
Between line, the output voltage for adjusting the network system.
Optionally, it is included at least at least one electrical equipment：Compressor in air-conditioning system.
Optionally, the photovoltaic power supply system further includes：Control device is connect with the buffer unit, is used for described
Buffer unit sends the control instruction for being adjusted to the energy input state or output state.
Other side according to the ... of the embodiment of the present invention provides a kind of method for controlling power supply of photovoltaic power supply system, institute
Stating photovoltaic power supply system includes：At least one electrical equipment, photovoltaic power supply device, network system, and for it is described at least
The energy input or output shape at least one of electricity condition, the photovoltaic power supply device and network system of one electrical equipment
The buffer unit that state is adjusted；The method includes：It determines the incision of specified device in the photovoltaic power supply system and/or cuts
It does well, wherein the specified device includes：At least one electrical equipment, photovoltaic power supply device and network system access
DC bus；According to the incision and/or cut out control instruction of the state generation for triggering the buffer unit；According to described in
Control instruction controls the buffer unit and is adjusted to the energy input or output state.
Other side according to the ... of the embodiment of the present invention provides a kind of method for controlling power supply of photovoltaic power supply system, institute
Stating photovoltaic power supply system includes：At least one electrical equipment, photovoltaic power supply device, network system；The method includes：
Determine the state of specified device in the photovoltaic power supply system, wherein shown state includes for indicating the finger
Determine device and accesses the first state of the photovoltaic power supply system and for indicating that the specified device removes the photovoltaic power supply system
System the second state, the specified device be at least one electrical equipment, photovoltaic power supply device and network system in extremely
It is one few；The energy input or output state of the specified device are adjusted according to the state.
Optionally, the energy input or output state of the specified device are adjusted according to the state, including：In the finger
It is the photovoltaic power supply device and when the state is the first state to determine device, the energy that the photovoltaic power supply device is provided
Amount distributes at least one electrical equipment according to preset rules.
Optionally, the energy that the photovoltaic power supply device provides is distributed at least one electricity consumption according to preset rules
Before equipment, the method further includes：Reduce the energy size for accessing the photovoltaic power supply system.
Optionally, reduce the energy size for accessing the photovoltaic power supply system, including：Obtain the photovoltaic power supply dress
At least one power generation section set, wherein the power generation section is used to reflect the corresponding hair of intensity of illumination in preset time period
Electricity；Reduce the energy size according to setting value corresponding at least one power generation section.
Optionally, the energy input or output state of the specified device are adjusted according to the state, including：In the finger
It is photovoltaic power supply device to determine device, and when the state is second state, adjusts the work of at least one electrical equipment
Make state, wherein the required electric energy of working condition of at least one electrical equipment after adjustment is less than the institute before adjustment
State the required electric energy of working condition of at least one electrical equipment.
Optionally, when adjusting the working condition of at least one electrical equipment, the method further includes：To the photovoltaic
Power supply system carries out energy compensating by least one of mode：The network system is converted into electricity consumption shape by generating state
State, wherein the generating state is used to provide electric energy to the photovoltaic power supply system, described to be used to receive the light with electricity condition
Lie prostrate the electric energy in power supply system；Energy compensating is carried out using the energy storage device in the photovoltaic power supply system.
Optionally, the energy input or output state of the specified device are adjusted according to the state, including：In the finger
Determine device be the photovoltaic power supply device, and the state be the first state when, by the network system by generating state
It is converted to and uses electricity condition；The specified device be the photovoltaic power supply device, and the state be second state when, will
The network system is converted to by generating state uses electricity condition.
Optionally it is determined that in the photovoltaic power supply system before the designated state of specified device, the method further includes：Inspection
Survey the voltage change information of DC bus in the photovoltaic power supply system, wherein at least one electrical equipment, photovoltaic power supply
Device and network system access the DC bus；When the voltage change information meets preset condition, from it is described at least
The specified device is determined in one electrical equipment, photovoltaic power supply device and network system.
In embodiments of the present invention, using in including at least one electrical equipment, photovoltaic power supply device and network system
It is arranged one for using in electricity condition, the photovoltaic power supply device and network system at least at least one electrical equipment
One of the buffer unit that is adjusted of energy input or output state, so as to be switched in and out suddenly in load or power supply
When, to the variation of energy into row buffering, ensure the stabilization transition of system mode, and then solve in the related technology, including mostly electric
The unstable technical problem of system is easily led in source and/or multi-load when load or power supply switch in and out suddenly.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is a kind of structural schematic diagram of photovoltaic power supply system according to the ... of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another optional photovoltaic power supply system according to the ... of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another optional photovoltaic power supply system according to the ... of the embodiment of the present invention；
Fig. 4 is a kind of flow chart of the method for controlling power supply of photovoltaic power supply system according to the ... of the embodiment of the present invention.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
It includes to be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment to cover non-exclusive
Those of clearly list step or unit, but may include not listing clearly or for these processes, method, product
Or the other steps or unit that equipment is intrinsic.
For the ease of understanding the embodiment of the present application, below such as by technical term summary involved in the embodiment of the present application
Under：
Energy：Refer to electric energy, such as power in the embodiment of the present application, voltage or electric current can be used to weigh in some cases
Amount.
Photovoltaic power supply：Photovoltaic generation is that luminous energy is directly translated into electric energy using the photovoltaic effect of interface
A kind of technology.It is mainly made of solar panel (component), controller and inverter three parts, critical piece is by electronics member
Device is constituted.Solar cell carries out packaging protection after series connection can form the solar module of large area, then matches and close
The components such as power controller are formed photovoltaic power generation apparatus.
In more power supplys and/or multiple load system, the incision suddenly of some element (such as power supply or load) wherein or
When cutting out, the energy of whole system can change, and it is unstable to be easy to cause system in this way.For example, being deposited in PV air-conditioner system
It, may be random sometimes in photovoltaic energy, air conditioning unit energy, power grid energy, energy-storage battery and DC load energy
Occur loading or power supply switches in and out, especially when there is fortuitous event suddenly, certain loads or energy source are unexpected
When incision or excision, whole system will will appear unstable, in fact it could happen that performance is unstable, even results in appearance safety danger
Danger.
For the above problem, this application provides corresponding solutions, to realize in different loads, the energy of power end
It seamlessly transits, has both ensured that unit normal switch machine uses air conditioning function, photovoltaic excess energy can be also sent to each end system
System, while redundance still can generate electricity, and when total system is unstable, may be implemented to carry out system stabilization tune by power grid
Section, to reliably realize whole PV air-conditioner system stable operation.To achieve the above object, the embodiment of the present application provides
Corresponding solution, it is described further below.
Fig. 1 is a kind of structural schematic diagram of photovoltaic power supply system according to the ... of the embodiment of the present invention.As shown in Figure 1, the photovoltaic
Power supply system, including：At least one electrical equipment 10, photovoltaic power supply device 12, network system 14, and for at least one
Electrical equipment is adjusted with the energy input of at least one of electricity condition, photovoltaic power supply device and network system or output state
Whole buffer unit 16；Wherein,
At least one electrical equipment 10, photovoltaic power supply device 12 and network system 14 access DC bus；
Optionally, electrical equipment 10 includes but not limited to：Unit press (i.e. the compressor of unit), high voltage direct current load,
Low-voltage direct load is electrical equipment, and photovoltaic power generation apparatus includes but not limited to photovoltaic panel, which is generating equipment, power grid
System 14 is bi-directional power.When each equipment needs work, wherein photovoltaic panel can only provide electric energy, and electrical equipment can only consume
Can, and network system may include using electricity condition and generating state.Unit in system will be added into network at random and (be
System) or be cut out outside network, therefore after completion status switching, it is still desirable to meet remaining system normal work, it is intermediate
A transient process will be handled, this transient process needs to buffer transition, to ensure equipment safety, ensures again remaining
Equipment normally remains in operation, without causing system-down or being damaged.
Buffer unit 16 access DC bus 18, and at least one electrical equipment 10, photovoltaic power supply device 12 and electricity
At least one of net system 14 connects.
Wherein, buffer unit 16 include but not limited to each unit in system (for example, electrical equipment, network system and
Photovoltaic power supply system) input or the state that is adjusted of output, for example, being arranged to network system and photovoltaic power supply device electricity consumption
State (receiving electric energy) and power supply state (being provided out electric energy, such as photovoltaic power supply state compensates electric energy to network system)
Each unit is turned on and off, and can also show as stablizing adjustment to the output voltage of each unit, for example, by using voltage stabilizing
Device is realized.Between each two equipment all in the presence of buffering operation reserve (can include but is not limited to hardware implementation mode, such as
Buffer unit), wherein comprising SPLL, Repetitive controller etc., these strategies are unified to be scheduled operation by DSP, wherein some
Or after multiple equipment excision, the strategy between surplus equipment opens operational mode, to realize grid generation, be cut with electricity condition
It changes and the energy storage of battery, discharge condition switch and the raising frequency of compressor, the switching of frequency reducing state, for high voltage direct current electricity consumption
Equipment and low-voltage direct electrical equipment realize the control of load switching by the main control unit and DC/DC1 of its front end, to
The completion for ensureing transient process, hence into the steady operational status of system after synchronous adjustment.
For example, as shown in Fig. 2, buffer unit 16 includes but not limited to：Storage for the power capacity for extending DC bus
Energy battery 160, connect with DC bus 18.Energy-storage battery is bi-directional power, that is, includes using electricity condition and generating state.With photovoltaic
For air-conditioning system, the application of energy-storage battery can provide many effects, wherein being rushed for the step for coping with PV air-conditioner unit
Prodigious effect has been hit, balance bus can be played the role of, in power supply, multiple load system more than one, busbar is as one
Common point, amplitude of variation has great role for whole system, therefore being incorporated to for energy-storage battery is equivalent to busbar capacity
Increase, will greatly reduce busbar fluctuation situation after expanding busbar capacity, other loads or power supply pair are reduced so as to arrive very much
In the corresponding of variation, so as to preferably handle transient equilibrium problem.
For example, as shown in Fig. 2, buffer unit 16 includes：First stable-pressure device 162 is arranged in energy-storage battery 160 and direct current
Between busbar 18.First stable-pressure device 162 includes but not limited to：First DC/DC Switching Power Supplies.
Optionally, at least one electrical equipment 10 includes：First DC load 100 and the second DC load 102, wherein
The operating voltage of first DC load 100 is more than the operating voltage of the second DC load 102, such as；Buffer unit 16 includes：The
Two stable-pressure devices 164 are arranged between the first DC load 100 and DC bus 18, for adjusting the first DC load 100
Output voltage；Third stable-pressure device 166 is arranged between the second DC load 102 and DC bus 18, straight for adjusting second
The output voltage of current load 102.Optionally, the second stable-pressure device 164 includes but not limited to：Controller；And/or third voltage stabilizing dress
Setting 166 includes：2nd DC/DC Switching Power Supplies.
For example, above-mentioned first DC load 100 is loaded including high voltage direct current, in PV air-conditioner system, this part is main
For loads such as DC fans, this fractional load is smaller, and for photovoltaic module, energy-storage system, network system, it changes not
It can cause system problem.But work as and be generalized to other systems in application, might have this problem, therefore the front end of its control section
It needs to increase the hardware configuration of buffering plate or adjusting treatment mechanism can be met by software adjustment.
Above-mentioned second DC load 102 includes but not limited to：Low-voltage direct loads, and low-voltage direct load is special in load
Using.There is the conversion buffered mechanism of DC/DC1 direct currents in loading nose, and the DC/DC1 conversion electric powers being related at present are that input is super
The high-voltage switch power supply (10-265VAC or 13-400VDC) of wide scope fully meets existing system busbar electricity jumpy
Buckling can be very good the problem of other corresponding load variations cause.
Optionally, as shown in Fig. 2, buffer unit 16 further includes：4th stable-pressure device 168 is arranged in photovoltaic power supply device
Between 12 and DC bus 18, the output voltage for adjusting photovoltaic power supply device 12.Optionally, buffer unit further includes：The
Five stable-pressure devices 170 are arranged between network system 14 and DC bus 18, the output voltage for adjusting network system.On
It includes but not limited to regulator circuit to state the 4th stable-pressure device 168 and the 5th stable-pressure device 170.It should be noted that buffer unit
16, to photovoltaic power supply device 12 and when network system 14 is adjusted, can not only adjust its output voltage
It is whole, maximum power point tracking (MPPT) controller, three-phase software phase-lock loop (SPLL) circuit, flexible switching electricity can also be used
The control system etc. that road, polarity switching circuit, Repetitive Control Technique are realized is adjusted, flexibly true with specific reference to actual conditions
It is fixed.
In one alternate embodiment, as shown in Fig. 2, above-mentioned photovoltaic power supply system can be applied in air-conditioning system, this
When, it includes at least in above-mentioned at least one electrical equipment：Compressor 172 in air-conditioning system.The compressor and DC bus it
Between buffer unit can also be set, for example, as shown in Figure 2 the buffer unit include：Adjusting apparatus 174, the adjusting apparatus 174 packet
The control device etc. of the working frequency of regulator circuit, control compressor is included but is not limited to, for example, PAWM devices, using weak magnetic skill
The speed regulation device etc. of art.For weak magnetic technology, in direct current generator theory, the method for changing DC motor speed has：Change electricity
Pivot adjusting velocity by voltage is also exactly to reduce exciting current, weaken main pole magnetic flux Φ speed governing；In speed governing of the frequency converter to asynchronous machine
In, when the output frequency of frequency converter is higher than Rated motor frequency, electric machine iron core magnetic flux Φ starts to weaken, and motor speed is higher than volume
Determine rotating speed, we claim motor to enter weak-magnetic speed-regulating at this time；When frequency converter is to asynchronous motor drive, once into weak-magnetic speed-regulating, become
Frequency device output voltage no longer changes, generally Rated motor voltage.And current of electric increases, and is more than rated current, speed increases
When electromagnetic torque reduce, power of motor is invariable power, so someone, which is called weak-magnetic speed-regulating, does constant-power speed regulation.
For example, in PV air-conditioner system, maximum load is compressor load.When the compressor of this part is shut down suddenly
When, and in the case of multiple power supply power supply states, system self-energy needs re-start distribution, it is necessary to be provided to energy
Road needs single port power supply to reduce output, controls output quantity；And two-port network must then be sentenced according to system requirements
Fixed whether Dietary behavior is converted, and to be started operation corresponding mechanism not Dietary behavior is converted, be adjusted input and output amount, complete
New balance is established after transitory again.
As shown in Fig. 2, photovoltaic power supply system includes but not limited to：Control device 20 is connect with buffer unit 16, for
Buffer unit 16 sends the control instruction for being adjusted to energy input state or output state.
Wherein, it for network system 14, when handling network system, is changed if encountering other loads,
State will be entered to switch.For example, when power grid provides energy to rear class, rear class, which is in, uses electricity condition, when successive load becomes
Big or change hour, as long as being still within can be still continuing with electricity condition without departing from use scope, however when in system
When increasing multiple power supplys, system will be faced to network system power supply state, and hence into generating state, power grid port needs to improve
Its transient response promotes power generation and is switched with electricity condition, to ensure that network system port is in stable state, the scheme being related to
There are Repetitive Control Technique, polarity switching technology, flexible handoff technique and SPLL technologies, is not only terminated in for power grid port certainly
These technologies can be synchronized and be seamlessly transitted for being precisely controlled the hair electricity of power grid port when there is more processing scheme.
It is within air-conditioning systems power supply system for photovoltaic power supply device 12, such as photovoltaic module, can only be supplied to rear class
Electricity cannot function as energy stores end, therefore be one way ports.When in photovoltaic module suddenly incision system, system power supply port
Increase suddenly, necessarily break original system balance, pour in big energy suddenly, these energy demands are controlled, and make it orderly
The each load distributed to use, while energy velocity and size that photovoltaic module enters in system are also controlled, to allow
Energy effectively establishes new system balancing point before pouring in system completely, to be again introduced into second of energy balance state.
When excision photovoltaic module suddenly, the energy in system is reduced suddenly, necessarily causes load supplying insufficient, busbar voltage drastically under
Drop problem, this portion of energy needs are provided by other energy, it is easy to cause the excessive danger of electric current, while load end due to
Energy is insufficient and causes to shut down or protect, and must rationally reduce load energy demand at this time, while it is another to allow other loads to enter
A kind of outer control model, such as weak magnetic control, power port in addition need to enable in time, and supplement busbar energy jump introduces
Problem, such as power grid port enters state switching or energy-storage battery carries out busbar electric energy supplement, after system balancing, energy storage
Battery exits application again.It in photovoltaic module port, wherein MPPT technique may be used, needs to adjust energy input in time, protect
Card energy can be inputted with system for tracking demand.
The upper treatment mechanism for each unit, but if effectively to play the stabilization of each unit, need total
The total dispatch deal of body control unit, and will flexibly handle this for the busbar control main control chip DSP of load port
A little problems carry out total scheduling, and then need to establish the algorithm of cooperative scheduling inside DSP.
Based on above-described embodiment, using existing topological structure, realizes and more power supplys, multiple load system energy shift are impacted
Be effectively treated, so as to solve the state switching problem between different steady state operating conditions, and preferably system is allowed to be in
Controllable state, to improve the functional diversity of system, system stability, unit reliability.
It is illustrated by taking photovoltaic power supply system as an example below, using PV air-conditioner system multipurpose characteristic, rationally carries out energy
The decaying and transfer of amount, to realize photovoltaic energy, air conditioning unit energy, power grid energy, energy-storage battery and DC load energy
It measures and is seamlessly transitted in different loads, power end, both ensured that unit normal switch machine uses air conditioning function, it also can be extra by photovoltaic
Energy is sent to each end system, while redundance still can generate electricity, and when total system is unstable, may be implemented to lead to
It crosses power grid and carries out system stable regulation, to reliably realize whole PV air-conditioner system stable operation.Especially go out suddenly
When existing fortuitous event, certain loads either energy source incision suddenly or when excision, whole system will will appear it is unstable, may
It is unstable to there is performance, even results in a kind of strategy turned danger into safety when there is danger.
All there is buffering operation reserve between each two equipment, wherein comprising SPLL, Repetitive controller etc., these strategy systems
One is scheduled operation by DSP, and after some or multiple equipment excision wherein, the strategy between surplus equipment opens operation
Pattern, to realize grid generation, switched with electricity condition and the energy storage of battery, discharge condition switching and compressor liter
Frequently, frequency reducing state switches, for high voltage direct current electrical equipment and low-voltage direct electrical equipment, by the main control unit of its front end with
And DC/DC1 realizes the control of load switching, to ensure the completion of transient process, hence into the steady of system after synchronous adjustment
Determine operating status.
Below in conjunction with Fig. 3, illustrated by taking PV air-conditioner system as an example, as shown in Figure 3：
First, it for network system 14, when handling network system, is changed if encountering other loads,
State will be entered to switch.For example, when power grid provides energy to rear class, rear class, which is in, uses electricity condition, when successive load becomes
Big or change hour, as long as being still within can be still continuing with electricity condition without departing from use scope, however when in system
When increasing multiple power supplys, system will be faced to network system power supply state, and hence into generating state, power grid port needs to improve
Its transient response promotes power generation and is switched with electricity condition, to ensure that network system port is in stable state, the scheme being related to
There are Repetitive Control Technique, polarity switching technology, flexible handoff technique and SPLL technologies, is not only terminated in for power grid port certainly
These technologies can be synchronized and be seamlessly transitted for being precisely controlled the hair electricity of power grid port when there is more processing scheme.
Secondly, for photovoltaic module 12, photovoltaic module is within air-conditioning systems power supply system, can only be powered to rear class, no
It can be used as energy stores end, therefore be one way ports.When in photovoltaic module suddenly incision system, system power supply port increases suddenly
Add, necessarily breaks original system balance, pour in big energy suddenly, these energy demands are controlled, and allow its orderly distribution
It is used to each load, while also to control energy velocity and size that photovoltaic module enters in system, to allow energy to exist
Before pouring in system completely, new system balancing point is effectively established, to be again introduced into second of energy balance state.When unexpected
When cutting off photovoltaic module, the energy in system is reduced suddenly, necessarily causes load supplying insufficient, busbar voltage, which drastically declines, asks
Topic, this portion of energy needs are provided by other energy, it is easy to cause the excessive danger of electric current, while load end is due to energy
It is insufficient and cause to shut down or protect, load energy demand must be rationally reduced at this time, while other loads being allowed to enter other one
Kind control model, such as weak magnetic control, and power port in addition needs to enable in time, supplements asking for busbar energy jump introducing
Topic, such as power grid port enters state switching or energy-storage battery carries out busbar electric energy supplement, after system balancing, energy storage electricity
Application is exited in pond again.In photovoltaic module port, most important one control technology is MPPT technique, needs to adjust energy in time
Input ensures that energy can be inputted with system for tracking demand.
In current PV air-conditioner system, load is that electrical equipment 10 includes high voltage direct current load, low-voltage direct load
And compressor load, wherein maximum load is compressor load.When the compressor of this part is shut down suddenly, and locate
In the case of multiple power supply power supply states, system self-energy needs re-start distribution, it is necessary to outlet are provided to energy, for list
Port power needs to reduce output, controls output quantity；And two-port network must then be determined whether according to system requirements into
Enter pattern conversion, to start operation corresponding mechanism not Dietary behavior is converted, adjust input and output amount, complete transitory
Establish new balance again afterwards.
It is loaded for high voltage direct current, in PV air-conditioner system, this part is mainly the loads such as DC fan, this part is negative
Load is smaller, and for photovoltaic module, energy-storage system, network system, variation will not cause system problem.But when popularization
To other systems in application, might have this problem, therefore the front end of its control section needs the hardware for increasing buffering plate to match
It sets or adjusting treatment mechanism can be met by software adjustment.
It is loaded for low-voltage direct, low-voltage direct load is special applications in load.There is DC/DC1 straight in loading nose
Buffering is changed in circulation, and the DC/DC1 conversion electric powers being related at present are the high-voltage switch power supply for inputting super wide range, completely full
Sufficient existing system busbar voltage variation jumpy, can be very good the problem of other corresponding load variations cause.
Finally, in PV air-conditioner application system, the application of energy-storage battery 160 can provide many effects, wherein for
This step impact of reply PV air-conditioner unit also has prodigious effect, can play the role of balance bus.More than one
In power supply, multiple load system, busbar has great role as a common point, amplitude of variation for whole system, therefore
Being incorporated to of energy-storage battery is equivalent to me and increases busbar capacity, and busbar fluctuation situation will be greatly reduced after expanding busbar capacity, from
And other loads of reduction or power supply can be arrived very much for the corresponding of variation, so as to preferably handle transient equilibrium problem.
It is above the treatment mechanism of each unit, but if effectively to play the stabilization of each unit, needs
The total dispatch deal of overall control unit, and control main control chip DSP (the i.e. control devices of load port for busbar
20) these problems will be flexibly handled, total scheduling is carried out, and then need to establish the algorithm of cooperative scheduling inside DSP.
Based on above example, only above each unit cooperates, and transient response could be allowed preferably to handle, to
Realize the cushioning control impacted to power step.Multi-load use can be met, " plug and play " function is realized, work(may be implemented
It can diversity；Using this processing strategy, the non-stop-machine state switching of unit may be implemented, improve user's comforts of use；
For this energy Spline smoothing, effective smoothing processing unit badly impacts, and improves the reliability of controller；Severe impact
Be effectively treated, it is possible to prevente effectively from the appearance of failure after sale, reduce failure rate；This strategy can be applied has mostly electricity similar
Source, multi-load system in, have versatility, can promote the use of.
Fig. 4 is the flow of the method for controlling power supply of another optional photovoltaic power supply system according to the ... of the embodiment of the present invention
Figure.Wherein, photovoltaic power supply system includes：At least one electrical equipment, photovoltaic power supply device, network system, and for extremely
The energy input or output state at least one of electricity condition, photovoltaic power supply device and network system of a few electrical equipment
The structure of the buffer unit being adjusted, the photovoltaic power supply system includes but not limited to structure shown in Fig. 1-3, as shown in figure 4,
This method includes：
Step S402 determines the state of specified device in the photovoltaic power supply system, wherein shown state includes being used for table
Show that the specified device accesses the first state of the photovoltaic power supply system and for indicating that the specified device removes the light
Lie prostrate power supply system the second state, specified device be at least one electrical equipment, photovoltaic power supply device and network system in extremely
It is one few.Optionally it is determined that the mode for switching in and out state includes but not limited to determine each interface in photovoltaic power supply system
State, wherein the interface is used to access each unit (such as electrical equipment, power-supply system, photovoltaic in photovoltaic power supply system
For electric installation).
Step S404, energy input or output state according to state adjustment specified device.
When specified device is photovoltaic power supply device and state is first state, energy that photovoltaic power supply device is provided by
At least one electrical equipment is distributed to according to preset rules.Wherein, preset rules include but not limited to：According to the default of electrical equipment
Priority distribution is distributed according to the required actual power distribution of electrical equipment, according to the rated power of electrical equipment.
In one alternate embodiment, energy that photovoltaic power supply device provides is distributed to according to preset rules at least one
Before electrical equipment, reduce the energy size of access photovoltaic power supply system, to control the speed of energy input photovoltaic power supply system,
That is control photovoltaic power supply device enters energy velocity and size in system.Wherein, at least the one of photovoltaic power supply device is obtained
A power generation section, wherein power generation section is used to reflect the corresponding generated energy of intensity of illumination in preset time period；According to at least
The corresponding setting value in one power generation section reduces energy size.Optionally, above-mentioned power generation section can be to photovoltaic power supply device
The multistage curve that is divided into of power generation curve in any one section of curve, and establish the pass of the mapping between every section of curve and setting value
System.
Optionally, specified device be photovoltaic power supply device, and state be the second state when, adjust at least one electricity consumption and set
Standby working condition, wherein before the required electric energy of working condition of at least one electrical equipment after adjustment is less than adjustment
The required electric energy of working condition of at least one electrical equipment.When adjusting the working condition of at least one electrical equipment, to light
Volt power supply system carries out energy compensating by least one of mode：Network system is converted into electricity consumption shape by generating state
State, wherein generating state is used to provide electric energy to photovoltaic power supply system, is used to receive the electricity in photovoltaic power supply system with electricity condition
Energy；Energy compensating is carried out using the energy storage device in photovoltaic power supply system.
It is photovoltaic power supply device in specified device as an alternative embodiment, and when state is first state, by power grid
System is converted to by generating state and uses electricity condition；Specified device be photovoltaic power supply device, and state be the second state when, will be electric
Net system is converted to by generating state uses electricity condition.
Wherein, above-mentioned specified device can determine in the following manner, but not limited to this：It detects straight in photovoltaic power supply system
Flow the voltage change information of busbar, wherein at least one electrical equipment, photovoltaic power supply device and network system access direct current mother
Line；When voltage change information meets preset condition, from least one electrical equipment, photovoltaic power supply device and network system really
Determine specified device.Wherein, detection voltage change information can be realized by the way that voltage transformer is arranged on DC bus, but unlimited
In this.Above-mentioned preset condition includes but not limited to judge that voltage change is greater than predetermined threshold value, but not limited to this.It can at one
It selects in embodiment, when detecting that direct current bus bar bucklingization is more than predetermined threshold value, determines system exception；Start detection
Abnormal reason, for example, detection is the voltage change which unit leads on DC bus in system；Then according to testing result
Include that the unit for causing DC bus-bar voltage to change and other units are adjusted to system, to ensure the steady mistake of system
It crosses.
It should be noted that the preferred embodiment of embodiment illustrated in fig. 4 may refer to the phase in Fig. 1-3 illustrated embodiments
Description is closed, details are not described herein again.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
In the above embodiment of the present invention, all emphasizes particularly on different fields to the description of each embodiment, do not have in some embodiment
The part of detailed description may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, for example, the unit division, Ke Yiwei
A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
On unit.Some or all of unit therein can be selected according to the actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes：USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can to store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (18)
1. a kind of photovoltaic power supply system, which is characterized in that including：At least one electrical equipment, photovoltaic power supply device, power grid system
System, and for the energy at least one of at least one electrical equipment, the photovoltaic power supply device and network system
The buffer unit that input or output state are adjusted；
At least one electrical equipment, photovoltaic power supply device and network system access DC bus；
The buffer unit accesses the DC bus, and at least one electrical equipment, photovoltaic power supply device and electricity
At least one of net system connects.
2. photovoltaic power supply system according to claim 1, which is characterized in that the buffer unit includes：
Energy-storage battery for the power capacity for extending the DC bus, connect with the DC bus.
3. photovoltaic power supply system according to claim 2, which is characterized in that the buffer unit further includes：First voltage stabilizing
Device is arranged between the energy-storage battery and the DC bus.
4. photovoltaic power supply system according to claim 3, which is characterized in that first stable-pressure device includes：First is straight
Circulate direct current DC/DC Switching Power Supplies.
5. photovoltaic power supply system according to claim 1, which is characterized in that
At least one electrical equipment includes：First DC load and the second DC load, wherein first DC load
Operating voltage be more than second DC load operating voltage；
The buffer unit includes：Second stable-pressure device is arranged between first DC load and the DC bus, uses
In the input voltage for adjusting first DC load；Third stable-pressure device, setting is in second DC load and described straight
Between flowing busbar, the input voltage for adjusting second DC load.
6. photovoltaic power supply system according to claim 5, which is characterized in that second stable-pressure device includes：Controller；
And/or the third stable-pressure device includes：2nd DC/DC Switching Power Supplies.
7. photovoltaic power supply system according to claim 1, which is characterized in that the buffer unit further includes：4th voltage stabilizing
Device is arranged between the photovoltaic power supply device and the DC bus, the output for adjusting the photovoltaic power supply device
Voltage.
8. photovoltaic power supply system according to claim 1, which is characterized in that the buffer unit further includes：5th voltage stabilizing
Device is arranged between the network system and the DC bus, the output voltage for adjusting the network system.
9. photovoltaic power supply system according to claim 1, which is characterized in that at least wrapped at least one electrical equipment
It includes：Compressor in air-conditioning system.
10. according to any one of claim 1 to 9 to the photovoltaic power supply system, which is characterized in that the photovoltaic power supply
System further includes：Control device is connect with the buffer unit, for being sent to the buffer unit for defeated to the energy
Enter state or control instruction that output state is adjusted.
11. a kind of method for controlling power supply of photovoltaic power supply system, which is characterized in that the photovoltaic power supply system includes：At least one
A electrical equipment, photovoltaic power supply device, network system；The method includes：
Determine the state of specified device in the photovoltaic power supply system, wherein shown state includes for indicating the specified dress
Set the first state for accessing the photovoltaic power supply system and for indicating that the specified device removes the photovoltaic power supply system
Second state, the specified device are at least one at least one electrical equipment, photovoltaic power supply device and network system
It is a；
The energy input or output state of the specified device are adjusted according to the state.
12. according to the method for claim 11, which is characterized in that adjust the energy of the specified device according to the state
Input or output state, including：
When the specified device is the photovoltaic power supply device and the state is the first state, by the photovoltaic power supply
The energy that device provides distributes at least one electrical equipment according to preset rules.
13. according to the method for claim 12, which is characterized in that the energy for providing the photovoltaic power supply device is according to pre-
Before if rule distributes at least one electrical equipment, the method further includes：
Reduce the energy size for accessing the photovoltaic power supply system.
14. according to the method for claim 13, which is characterized in that reduce the energy for accessing the photovoltaic power supply system
Size, including：
Obtain at least one power generation section of the photovoltaic power supply device, wherein the power generation section is for reflecting preset time
The corresponding generated energy of intensity of illumination in section；
Reduce the energy size according to setting value corresponding at least one power generation section.
15. according to the method for claim 11, which is characterized in that adjust the energy of the specified device according to the state
Input or output state, including：
The specified device be photovoltaic power supply device, and the state be second state when, adjustment it is described at least one
The working condition of electrical equipment, wherein the required electric energy of working condition of at least one electrical equipment after adjustment is small
The required electric energy of working condition of at least one electrical equipment before adjustment.
16. according to the method for claim 15, which is characterized in that the working condition of adjustment at least one electrical equipment
When, the method further includes：
Energy compensating is carried out by least one of mode to the photovoltaic power supply system：By the network system by power generation shape
State is converted to electricity condition, wherein the generating state is used to provide electric energy to the photovoltaic power supply system, described to use electricity condition
For receiving the electric energy in the photovoltaic power supply system；Energy benefit is carried out using the energy storage device in the photovoltaic power supply system
It repays.
17. according to the method for claim 11, which is characterized in that adjust the energy of the specified device according to the state
Input or output state, including：
The specified device be the photovoltaic power supply device, and the state be the first state when, by the power grid system
System is converted to by generating state uses electricity condition；It is the photovoltaic power supply device in the specified device, and the state is described
When the second state, the network system is converted to by generating state and uses electricity condition.
18. the method according to any one of claim 11 to 17, which is characterized in that determine the photovoltaic power supply system
Before the designated state of middle specified device, the method further includes：
Detect the voltage change information of DC bus in the photovoltaic power supply system, wherein at least one electrical equipment, light
Volt accesses the DC bus for electric installation and network system；
When the voltage change information meets preset condition, from least one electrical equipment, photovoltaic power supply device and electricity
The specified device is determined in net system.
Priority Applications (2)
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| CN201810138358.9A CN108281952B (en) | 2018-02-10 | 2018-02-10 | Photovoltaic power supply system and power supply control method thereof |
| PCT/CN2018/118972 WO2019153856A1 (en) | 2018-02-10 | 2018-12-03 | Photovoltaic power supply system and power supply control method therefor |
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| CN201810138358.9A CN108281952B (en) | 2018-02-10 | 2018-02-10 | Photovoltaic power supply system and power supply control method thereof |
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Also Published As
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| CN108281952B (en) | 2024-04-16 |
| WO2019153856A1 (en) | 2019-08-15 |
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