CN106026165A - Photovoltaic-energy storage hybrid DC micro-grid-based load reduction method - Google Patents
Photovoltaic-energy storage hybrid DC micro-grid-based load reduction method Download PDFInfo
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- CN106026165A CN106026165A CN201610464110.2A CN201610464110A CN106026165A CN 106026165 A CN106026165 A CN 106026165A CN 201610464110 A CN201610464110 A CN 201610464110A CN 106026165 A CN106026165 A CN 106026165A
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- 238000005094 computer simulation Methods 0.000 description 2
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Classifications
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- H02J3/385—
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of power, in particular to a photovoltaic-energy storage hybrid DC micro-grid-based load reduction method. The method comprises the steps as follows: a load 1, ..., a load n (n is a positive integer greater than 1) with different important degrees are set with different voltage grades on the basis of a local DC voltage measurement value; and corresponding removal priority levels are given to achieve load reduction. According to the operation scheme, the optimal load reduction effect is achieved through coordinated control between an energy storage system and various loads; removal of as few loads as possible is achieved on the basis of ensuring that the important loads are continuously and stably supplied with electricity; the power supply for the loads in a system is ensured as more as possible; stable DC bus voltage is effectively maintained; and the operation reliability of the system is improved. The DC voltage is adopted as the load reduction standard; the DC voltage is information content of local control; the information structure is simple; a complicated communication technology is not needed; and the load reduction method is simple in control structure and easy to implement.
Description
Technical field
The invention belongs to technical field of electric power, particularly to one based on photovoltaic-energy storage mixed DC microgrid off-load
Method.
Background technology
Under the dual-pressure of energy crisis and environmental conservation, microgrid is paid attention to widely by all circles and answers
With.Micro-grid system refers to electrical network form distributed new, energy-storage units and load combined,
Both can be incorporated into the power networks, it is also possible to operate in island mode.Microgrid structure specifically includes that the micro-electricity of exchange at present
Net, direct-current grid and mixing micro-capacitance sensor.Conventional research is concentrated mainly on exchange micro-capacitance sensor, however as
Being continuously increased of DC load, direct-current micro-grid quickly grows in recent years, but the randomness of new forms of energy is given straight simultaneously
Stream microgrid runs to bring problems and control power-balance and maintains DC bus-bar voltage stable, it is ensured that direct current
Microgrid reliability service has become as one of technological challenge of direct-current micro-grid development.
Stable for ensureing direct-current micro-grid reliability service and maintenance DC bus-bar voltage under new forms of energy fluctuate, can be right
Direct-current micro-grid carries out energy management and load management is coordinated to control.Low-voltage direct micro-capacitance sensor longtime running is in isolated island
State, it is most likely that occur that the situation that energy is under-supply, such as intensity of illumination reduce suddenly, photovoltaic exports
Power reduction or load are significantly increased, and vacancy power cannot be supplied, and cause end load demand more than system
The power that distributed new and energy-storage module send, DC bus-bar voltage can occur because of unbalanced power
Fall；Accumulator continuous discharge causes accumulator Ssoc≤ 40% be not enough to maintain DC bus-bar voltage, above two
The situation of kind all can cause the instability of micro-grid system under islet operation pattern, so taking load management effectively
Coordinate to control to be necessary means.
But, load management control research in terms of, between AC network medium frequency and active power under
Vertical characteristic can be used to reflect the balance of system active power, and the particularity of DC micro-electric web frame,
The method causing AC system medium and low frequency off-load can not be applied in direct-current grid.It is thus desirable to direct current
The load management scheme of system is studied.
Summary of the invention
It is an object of the invention to provide a kind of photovoltaic-energy storage mixed DC microgrid due to intensity of illumination and load change
The side of off-load under the state that change or for a long time islet operation storage battery charge state are too low and are in unbalanced power
Method.Optimum off-load effect is reached, it is ensured that important load by coordinating control between energy-storage system and each load
Accomplish to cut load less on the basis of continual and steady power supply, the power supply of load in guarantee system as much as possible as far as possible,
And effectively maintain DC bus-bar voltage stable, improve system reliability of operation.
For achieving the above object, the technical solution used in the present invention is: a kind of based on photovoltaic-energy storage mixed DC
The method of microgrid off-load, including: based on local dc voltage measurements, to the load 1 that significance level is different ...,
Load n (n is the positive integer more than 1) arranges different electric pressures, revests and excises priority accordingly
Do not realize off-load；It is specifically divided into following two situation:
As accumulator demand power PbMore than rated power PbrTime, take DC voltage as off-load standard, if
Each it is loaded with two different electric pressure the first electric pressure Δ VLaWith the second electric pressure Δ VLb, first
Electric pressure Δ VLaFor perunit value, when the electric pressure of load reaches the first electric pressure Δ VLaTime, at once cut
Except this load；Second electric pressure Δ VLbIt is applicable to all loads, when electric pressure drops to the second electric pressure
ΔVLbHereinafter, and the T that holds timen(TnCorresponding load 1 ..., n) rear cutout removes respective load；
As storage battery charge state SsocWhen≤40%, accumulator controls the reference voltage V of dc busdc *Change
For 0.9p.u. and the T that holds timen, trigger the second electric pressure Δ VLbExcision respective load.
In above-mentioned method based on photovoltaic-energy storage mixed DC microgrid off-load, described different to significance level
Load 1 ..., load n (n is the positive integer more than 1) the first electric pressure Δ V is setLaIncluding: depend on
Described load 1 ..., the significance level of load n arranges the first electric pressure from low to high and corresponds to Δ V respectivelyLa (1)..., Δ VLa(n), give described load 1 simultaneously ..., load n excision priority level from low to high；
And Δ VLa(n)>ΔVLa(1)。
In above-mentioned method based on photovoltaic-energy storage mixed DC microgrid off-load, described different to significance level
Load 1 ..., load n (n is the positive integer more than 1) the second electric pressure Δ V is setLbIncluding: depend on
Described load 1 ..., the significance level of load n arranges the second electric pressure from low to high and is Δ VLb, when negative
Carry voltage and reduce to described second electric pressure Δ VLbBelow and maintain corresponding time T1..., TnRear cutout is removed
Respective load, and Tn>T1。
In above-mentioned method based on photovoltaic-energy storage mixed DC microgrid off-load, described in hold time TnFoundation
Described load 1 ..., the sensitivity of voltage dip is set by load n (n is the positive integer more than 1), with
Ensure that busbar voltage is recovered to reference value；The described T that holds timenValue and described load 1 ..., load n
Sensitivity to voltage dip is inverse relation.
Above-mentioned technical scheme is illustrated further, needs for photovoltaic-energy storage mixed DC microgrid accumulator
Seek power PbMore than rated power PbrThe method of off-load: take the DC voltage standard as off-load, each negative
Carry and have two different electric pressures, the first electric pressure Δ VLaRelated load is taked off-load immediately
Operation；Second electric pressure Δ VLbIt is applicable to all loads, when voltage is reduced to below this voltage and maintains
Between Tn(TnCorrespondence load 1 respectively ..., n) rear cutout removes related load.Loads different for significance level is arranged
Different electric pressures, most important load has the highest excision priority, is endowed the voltage difference of maximum
ΔVLa, simultaneously need to the longest time TnCarrying out off-load operation, vice versa.
For photovoltaic-energy storage mixed DC microgrid storage battery charge state SsocThe method of≤40% off-load: isolated island is transported
The energy storage of initial stage battery module of row is sufficiently large, can the DC voltage of control system completely, but
Along with the prolongation of islet operation time, the energy in energy storage device can gradually decrease.Once accumulator SsocIt is less than
The threshold value set, accumulator controls the reference voltage of dc bus and changes to lower value 0.9p.u. and maintain
A period of time Tn(TnFor definite value, can be set according to practical situation) trigger the second electric pressure Δ VLbTripping
Respective load.
Beneficial effects of the present invention:
1, taking DC voltage as the standard of off-load, DC voltage is the local quantity of information controlled, and information is tied
Structure is simple, it is not necessary to complicated communication technology.
2, off-load method reaches optimum off-load effect by coordinating control between energy-storage system and each load, protects
Card important load is accomplished to cut load less, in guarantee system as much as possible on the basis of powering continually and steadily as far as possible
The power supply of load, and effectively maintain DC bus-bar voltage stable, improve system reliability of operation.
3, the off-load method control structure that the present invention proposes is simple, it is easy to accomplish.
Accompanying drawing explanation
Fig. 1 is one embodiment of the invention photovoltaic-energy storage mixing low-voltage direct microgrid structure chart；
Fig. 2 is the off-load method of one embodiment of the invention；
Fig. 3 is one embodiment of the invention storage battery charge state Ssoc≤ 40% controls figure；
Fig. 4 (a) is one embodiment of the invention islet operation illumination rapid drawdown off-load Dynamic simulation figure；
Fig. 4 (b) is one embodiment of the invention accumulator Ssoc≤ 40% off-load Dynamic simulation figure；
Wherein: Ssoc-storage battery charge state；IB-battery current；IB_max-battery discharging upper current limit；
ΔVdc-DC bus-bar voltage variable quantity；Vdc *-dc bus reference voltage；Vdc-DC bus-bar voltage；IB *-electric power storage
Pond reference current；ΔVLa(1)First electric pressure of-load 1；ΔVLa(n)First electric pressure of-load n；
ΔVLb-the second electric pressure；PL-bearing power；Pbat-battery power；Ppv-photovoltaic output；Uo-is straight
Stream busbar voltage.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the present invention are described in detail.
Embodiment
As it is shown in figure 1, the present embodiment photovoltaic-energy storage mixing low-voltage direct microgrid structure chart, the present embodiment is studied
Off-load method under islet operation pattern, therefore grid-connected converter and a series of grid connected structure of static switch are again
Secondary ignore, mainly operated in MPPT maximum power point tracking pattern even by photovoltaic battery panel by buck converter PC1
It is connected to dc bus, exports the peak power that can export under certain intensity of illumination；Accumulator is double by one
It is connected to dc bus to changer PC2 and controls DC bus-bar voltage, to ensure both to have absorbed electric energy,
Also electric energy can be sent, it is achieved the two-way flow of energy.Photovoltaic-energy storage mixed DC electricity generation system is at islet operation
Constant power load PC3 and the load energy supply of constant-impedance this locality can be given during state.
As in figure 2 it is shown, the technical scheme that the present embodiment uses is as follows: a kind of based on photovoltaic-energy storage mixed DC
The method of microgrid off-load, including: based on local dc voltage measurements, to the load 1 that significance level is different ...,
Load n (n is the positive integer more than 1) arranges different electric pressures, revests and excises priority accordingly
Do not realize off-load；It is specifically divided into following two situation:
As accumulator demand power PbMore than rated power PbrTime, take DC voltage as off-load standard, if
Each it is loaded with two different electric pressure the first electric pressure Δ VLaWith the second electric pressure Δ VLb, first
Electric pressure Δ VLaFor perunit value, when the electric pressure of load reaches the first electric pressure Δ VLaTime, at once cut
Except this load；Second electric pressure Δ VLbIt is applicable to all loads, when electric pressure drops to the second electric pressure
ΔVLbHereinafter, and the T that holds timen(TnCorresponding load 1 ..., n) rear cutout removes respective load；
As storage battery charge state SsocWhen≤40%, accumulator controls the reference voltage V of dc busdc *Change
For 0.9p.u. and the T that holds timen, trigger the second electric pressure Δ VLbExcision respective load.
In above-mentioned method based on photovoltaic-energy storage mixed DC microgrid off-load, described different to significance level
Load 1 ..., load n (n is the positive integer more than 1) the first electric pressure Δ V is setLaIncluding: depend on
Described load 1 ..., the significance level of load n arranges the first electric pressure from low to high and corresponds to Δ V respectivelyLa (1)..., Δ VLa(n), give described load 1 simultaneously ..., load n excision priority level from low to high；
And Δ VLa(n)>ΔVLa(1).The described load 1 different to significance level ..., (n is more than 1 to load n
Positive integer) the second electric pressure Δ V is setLbIncluding: according to described load 1 ..., the significance level of load n
Second electric pressure is set from low to high and is Δ VLb, when load voltage reduces to described second electric pressure Δ VLb
Below and maintain corresponding time T1..., TnRear cutout removes respective load, and Tn>T1.Described hold time
TnAccording to described load 1 ..., the sensitivity of voltage dip is set, to ensure that busbar voltage is extensive by load n
Multiple to reference value；The described T that holds timenValue and described load 1 ..., quick to voltage dip of load n
Sensitivity is inverse relation.
As in figure 2 it is shown, DC micro power grid system needs off-load the most in the following two cases, when system because of
Excessively put more than situation or the battery module of the rated power generation current limliting electric discharge of battery for battery requirements power
During electricity, off-load runs becomes the necessary choice ensureing DC bus-bar voltage.
The first situation, as accumulator demand power PbMore than rated power Pbr, output current-clamp is at Ibmax,
Battery-operated exits Isobarically Control at limited current state, external voltage ring filling, and accumulator cannot effectively control directly
Stream voltage, now needs off-load to run to ensure dc bus, if intrasystem power demand continues to increase,
DC voltage can be gradually distance from rated value, now in order to ensure direct-current grid not unstability, needs without communication
In the case of just can realize off-load based on local dc voltage measurements method.Significance level is different
Load arranges different electric pressures, this excision priority different equal to giving different loads.Idiographic flow
Figure as in figure 2 it is shown, in fig. 2 each load have two different electric pressures and cut for judging whether
This load, the excision low load of priority level will before the load that excision priority level is high tripping with to greatest extent
Retain more higher ranked load:
First electric pressure Δ VLaFor perunit value, related load is taked the operation of off-load immediately, be used for sentencing
Disconnected related load, the need of excising immediately, loads the Δ V of 1 correspondence in fig. 2La(1)For 0.15p.u. (i.e.
Vdc=0.85p.u.) with load Δ V corresponding to nLa(n)For 0.2p.u. (i.e. Vdc=0.8p.u.).
Second electric pressure Δ VLb0.1p.u. is for all loads, when DC voltage is consistently less than 0.9p.u.
A period of time Tn(TnCorresponding load 1 ... by electric pressure Δ V time n)LbJudge whether to need tripping to be correlated with
Load；TnAccording to equipment in Practical Project, the sensitivity of voltage dip can be set, as load 1 exists
When working under 0.9p.u. DC voltage on the impact of its working effect not quite, time T1Just can arrange slightly grows one
A bit, and if load 1 sensitive to voltage dip, work under 0.9p.u. DC voltage and its working effect had very
Big impact even can threaten equipment safety, then T1Will arrange is short, but total TnShould not arrange long,
It is intended to ensure that busbar voltage can be recovered in time to reference value.
The load of the highest excision priority level has the Δ V that numerical value is the biggestLaAnd need longer Tn, such as Fig. 2
Middle load n is higher than load 1 grade of load, therefore Δ VLa(n)>ΔVLa(1), Tn>T1。
The second situation, owing to the long islet operation of system is likely to result in energy storage deficiency thus affects system
The power supply of interior important load, the most also should take off-load measure.In this case, the initial stage of islet operation
The energy storage of energy-storage system is sufficiently large, can the DC voltage of control system completely, but be as isolated island fortune
The prolongation of row time, the energy in energy storage device can gradually decrease, when accumulator continuous discharge is to accumulator lotus
Electricity condition Ssoc≤ 40%, can cause being not enough to maintain DC bus-bar voltage.Now, in order to extend DC micro-electric
The islet operation time of net, system need to use reasonably to ensure to power to the important load that the grade of load is higher
Load management algorithms carries out off-load operation.
Once storage battery charge state SsocLess than the threshold set, accumulator controls the reference voltage of dc bus
Vdc *Relatively low value 0.9p.u. will be become and maintain a period of time Tn, as shown in Figure 3.Due on circuit
Small resistor and switching loss so that the actual DC busbar voltage of load end has been slightly less than 0.9p.u..As
Shown in Fig. 2, therefore load 1 excises.When, after load 1 excision, direct voltage reference value can gradually recover
To nominal reference, until being no longer necessary to off-load, dc bus reference voltage Vdc *Recover through after a period of time
Initial value.Obviously, off-load strategy in this case needs the coordination between energy-storage system and each load to control
Can be only achieved the off-load effect of optimum.Optimum off-load effect is ensureing that important load is powered continually and steadily
On the basis of accomplish to cut load less as far as possible, the power supply of load in guarantee system as much as possible.
Hereinafter use Matlab/Simulink simulation software to carry out simulation study, verify the present embodiment institute moving party
The feasibility of method and effectiveness, shown in the simulation waveform figure drawn such as Fig. 4 (a), (b).This simulation study
Direct-current grid DC bus-bar voltage be 400V, it is allowed to DC voltage variable quantity ε=± 10V.Direct current is female
It is 1.0kw/m that line accesses intensity of illumination2Capacity is 8kW photovoltaic generating system.Energy-storage system uses
The accumulator of 200V/55AH, specified charge and discharge upper current limit is 24A, storage battery charge state SOC's
Bound is respectively 95% and 40%.Direct-current grid contains polytype load, including: the direct current of 1kW
Constant power load and local load, wherein Buck changer and resistance composition direct current constant power load.
Photovoltaic battery panel in low-voltage direct microgrid operates in MPPT maximum power point tracking pattern and is connected to direct current mother
Line, exports the peak power that can export under certain intensity of illumination, the local load 1,2 and 3 of system band.
The excision priority level of institute's bringing onto load 1 is minimum, as Δ VLa> 0.15p.u. time excise load 1 immediately, load 3
Excision priority level is the highest, loads 2 ranks and takes second place, and when DC bus-bar voltage is consistently less than 0.9p.u. mono-
Section time T2, load 2 excision is the most cut with protection load 3.When 0.6 second, illumination weakens suddenly, from 1.0kw/m2
Drop to 0.4kw/m2, the power that photovoltaic battery panel sends drops to 3.2KW from 8KW, and accumulator is with more
Big electric current is for load, 0.66 second battery discharging electric current IbTouch the upper limit of dispatch from foreign news agency pressure ring, Ib>Ibmax,
Outer voltage exits control, and accumulator amplitude limit discharges, it is impossible to controls DC bus-bar voltage and makes voltage be back to 400V,
Collapse under DC bus-bar voltage 0.7 second and excise priority level relatively low-load 1 less than 0.85p.u., tripping immediately, make
Obtain dispatch from foreign news agency pressure ring and exit saturated, participate in DC bus-bar voltage and control, DC bus-bar voltage recovery to 400V, as
Shown in Fig. 4 (a).Accumulator is constantly in discharge condition, battery S when 0.8 secondsoc≤ 40% controls direct current mother
The reference voltage of line become 0.9p.u. and persistently 0.2s (the present embodiment emulation set T2=0.2s), it is set in and cuts
Except the minimum load 1 of priority level is by under conditions of tripping, when 1 second, the grade of load is cut in the most other tripping
The load 2 taken second place, it is ensured that load 3 energy supply the highest to excision priority level, battery charging simultaneously, such as Fig. 4
Shown in (b).
It should be appreciated that the part that this specification does not elaborates belongs to prior art.
Although describe the detailed description of the invention of the present invention above in association with accompanying drawing, but ordinary skill people
Member should be appreciated that these are merely illustrative of, and these embodiments can be made various deformation or amendment,
Principle and essence without departing from the present invention.The scope of the present invention is only limited by the claims that follow.
Claims (4)
1. a method based on photovoltaic-energy storage mixed DC microgrid off-load, it is characterised in that including: based on this
Ground dc voltage measurements, to the load 1 that significance level is different ..., (n is the most whole more than 1 to load n
Number) different electric pressures is set, revest corresponding excision priority level to realize off-load；It is specifically divided into
Following two situation:
As accumulator demand power PbMore than rated power PbrTime, take DC voltage as off-load standard, if
Each it is loaded with two different electric pressure the first electric pressure Δ VLaWith the second electric pressure Δ VLb, first
Electric pressure Δ VLaFor perunit value, when the electric pressure of load reaches the first electric pressure Δ VLaTime, at once jump
Lock excises this load；Second electric pressure Δ VLbIt is applicable to all loads, when electric pressure drops to the second voltage
Grade Δ VLbHereinafter, and the T that holds timen(TnCorresponding load 1 ..., n) rear cutout removes respective load；
As storage battery charge state SsocWhen≤40%, accumulator controls the reference voltage V of dc busdc *Change
For 0.9p.u. and the T that holds timen, trigger the second electric pressure Δ VLbExcision respective load.
Method based on photovoltaic-energy storage mixed DC microgrid off-load the most according to claim 1, it is special
Levy and be, the described load 1 different to significance level ..., load n (n is the positive integer more than 1) sets
Put the first electric pressure Δ VLaIncluding: according to described load 1 ..., the significance level of load n sets from low to high
Put the first electric pressure and correspond to Δ V respectivelyLa(1)..., Δ VLa(n), give described load 1 simultaneously ...,
Load n excision priority level from low to high；And Δ VLa(n)>ΔVLa(1)。
Method based on photovoltaic-energy storage mixed DC microgrid off-load the most according to claim 1, it is special
Levy and be, the described load 1 different to significance level ..., load n (n is the positive integer more than 1) sets
Put the second electric pressure Δ VLbIncluding: according to described load 1 ..., the significance level of load n sets from low to high
Put the second electric pressure and be Δ VLb, when load voltage reduces to described second electric pressure Δ VLbBelow and tie up
Hold corresponding time T1..., TnRear cutout removes respective load, and Tn>T1。
Method based on photovoltaic-energy storage mixed DC microgrid off-load the most according to claim 1, it is special
Levy and be, described in hold time TnAccording to described load 1 ..., load n (n is the positive integer more than 1)
The sensitivity of voltage dip is set, to ensure that busbar voltage is recovered to reference value；The described T that holds timen's
Value and described load 1 ..., load n is inverse relation to the sensitivity of voltage dip.
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