CN106169752B - Main power source flexible switching method under a kind of micro-capacitance sensor off-network mode - Google Patents
Main power source flexible switching method under a kind of micro-capacitance sensor off-network mode Download PDFInfo
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- CN106169752B CN106169752B CN201610861064.XA CN201610861064A CN106169752B CN 106169752 B CN106169752 B CN 106169752B CN 201610861064 A CN201610861064 A CN 201610861064A CN 106169752 B CN106169752 B CN 106169752B
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- 230000033228 biological regulation Effects 0.000 claims description 16
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- H02J3/005—
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J3/38—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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Abstract
The invention discloses main power source flexible switching methods under a kind of micro-capacitance sensor off-network mode, belong to the technical field of electric system micro-capacitance sensor operation control.Based on energy storage PCS is sagging or VSG technology, using the flexible smooth-switching method of the progressive transfer of load, realize under micro-capacitance sensor off-network mode, the flexible smooth and seamless switching between the rotary power source main power source method of operation and the energy storage main power source method of operation.
Description
Technical field
The invention discloses main power source flexible switching methods under a kind of micro-capacitance sensor off-network mode, belong to electric system micro-capacitance sensor
Run the technical field of control.
Background technique
Due to the rapid development of power electronics and new energy technology, micro-capacitance sensor technology has obtained more and more applications, at
For the important channel for solving the regional power supplies such as island, remote High aititude.Important form one of of the micro-capacitance sensor as distributed power generation,
Be the autonomous system that can be realized self operational management, can both be incorporated into the power networks with bulk power grid, can also with isolated power grid (
Claim off-grid operation or isolated operation), therefore micro-capacitance sensor has the flexible method of operation, improve system operation stability and can
By property.
Micro-capacitance sensor is since there are grid-connected and two kinds of operational modes of off-network, in relation to grid-connected cutting between off-grid operation mode
Change the important research direction for micro-capacitance sensor operation control into.Switching between micro-grid connection and off-network mode can totally be divided into simultaneously
Net leaves net pattern switching and off-network turns grid-connect mode switching.Whether carried out that plan can be divided into according to schedule according to pattern switching
With unplanned pattern switching, some are classified as seamed and seamless switching according to whether there is power failure process in handoff procedure.Mesh
Before, net is left for micro-grid connection and off-network turns in grid-connected both of which switching, off-network turns grid-connect mode handoff technique difficulty
It is small, it is easy to accomplish, and if the grid-connected net pattern switching that leaves realizes that unplanned seamless switching technique difficulty is larger.Therefore current grid-connected
It leaves the correlative study of net pattern switching and patent is more, such as " the microgrid operational mode seamless switching based on virtual synchronous generator
Control strategy " in propose a kind of parallel switching method followed based on controller state, i.e. the current source mode and VSG of PQ control
The phase and electric current of the voltage source mode of (virtual synchronous generator, Virtual Synchronous Generator) control refer to
All real-time trackings are enabled, to realize the seamless switching of operational mode；" micro-grid connection based on GOOSE leaves net and smoothly switches
Intelligent control method " propose in patent it is a kind of net realization micro-grid connection quickly control based on GOOSE leave net smoothly switch
Intelligent control method.
Although the switching of two kinds of operational modes of micro-grid connection and off-network is most important, for it is some only run on from
For the micro-capacitance sensor of net mode, off-grid stable operation and the switching of main power source are the important guarantors that realization system is run steadily in the long term
Card.Both also contain new distribution type containing traditional rotary power source (such as diesel-driven generator, gas turbine) in some off-network type micro-capacitance sensors
Power supply and energy storage, can be used as system main power source in operation has rotary power source and energy storage, and energy storage does main power source operation often
The operational mode seen is V/F or sagging (VSG) operational mode.After distributed generation resource largely accesses micro-capacitance sensor, to realize micro- electricity
There is the power work that stops rotating, the demand that energy storage is run separately as main power source, this and previous electric rotating in net economical operation
Source is decided the main power source switching control then existed between power operating mode under off-network mode.Currently, for containing rotary power source
With the micro-capacitance sensor of energy storage, when off-grid operation, generallys use rotary power source main power source stable operation.But in some energy storage with bigger
Off-network type micro-capacitance sensor in, sometimes because rotary power source maintenance or failure and other reasons, there are energy storage do main power source operation control need
It asks, therefore, the main power source switching in micro-capacitance sensor when off-grid operation is also essential pattern switching control technology.Due to the country
Longtime running is less in the micro-capacitance sensor of off-network mode, thus pertinent literature that main power source when to off-grid operation switches and patent compared with
It is few.Main electricity when a kind of micro-capacitance sensor off-grid operation is proposed in a kind of " independent operating micro-grid master control power-supply switching method " patent
Source switch method, but the patent primarily focuses on the entry condition for illustrating main power source switching, while briefly describing rotation
Power supply dump energy main power source, energy storage turn the switch step of rotary power source main power source, but do not consider in handoff procedure in patent
The progressive transfer of load, therefore there may be switch disturbances even to switch greatly in the off-network main power source switching in extensive micro-capacitance sensor
The risk of failure, to not be suitable in extensive micro-capacitance sensor off-network main power source switching control.
Summary of the invention
Goal of the invention of the invention is the deficiency for above-mentioned background technique, is provided main under a kind of micro-capacitance sensor off-network mode
Power supply flexible switching method proposes (virtual based on energy storage PCS (current transformer, Power Control System) sagging or VSG
Synchronous generator, Virtual Synchronous Generator) technology, it is smoothly switched using the flexibility of the progressive transfer of load
Method realizes under micro-capacitance sensor off-network (or making " isolated network ") mode that rotary power source (such as diesel generating set or internal combustion unit) is main
Flexible smooth and seamless switching between power operating mode and the energy storage main power source method of operation, it is especially big to solve existing micro-capacitance sensor
System voltage and frequency bear the skill impacted compared with large disturbances in main power source handoff procedure when scale micro-capacitance sensor off-network (isolated island) is run
Art difficult point.
The present invention adopts the following technical scheme that for achieving the above object
Main power source flexible switching method under a kind of micro-capacitance sensor off-network mode, comprising:
The method that rotary power source main power source operational mode switches to energy storage main power source operational mode:
When meeting the switching entry condition of rotary power source dump energy main power source, using the control mode of the progressive transfer of load
The load that rotary power source is undertaken gradually is transferred to energy storage, adjusts energy storage PCS operational mode, and control rotary power source is shut down；
The method that energy storage main power source operational mode switches to rotary power source main power source operational mode:
When meeting energy storage and turning the switching entry condition of rotary power source main power source, start rotary power source, to offset electric rotating
The inverse probability occurred after the simultaneous interconnecting of source is the power that target adjusts part energy storage PCS, after the elimination of inverse probability phenomenon, is adjusted each
Energy storage PCS operational mode and the active progressive transfer exported to realize load.
Scheme is advanced optimized as main power source flexible switching method under a kind of micro-capacitance sensor off-network mode, is being rotated
Power supply main power source operational mode switches to during energy storage main power source operational mode, will using the control mode of the progressive transfer of load
The load that rotary power source undertakes gradually is transferred to energy storage, method particularly includes: with every rotary power source stop moment to micro-capacitance sensor electricity
The disturbance that pressure and frequency generate is target within the scope of tolerance, gradually adjusts the active output of energy storage PCS until each storage
Energy PCS output is active to reach calculating target value, and it includes its own active output section that each energy storage PCS, which exports active calculating target value,
The active transfer amount part of load divided and undertaken according to its own rated power accounting, wherein
The active calculating target value P of kth platform energy storage PCSbat_goal(k) are as follows:Pbat(k) table
Show kth platform energy storage PCS rotary power source main power source operational mode to energy storage main power source operational mode switching before active output, 1
≤ k≤N, N are the number of units of energy storage PCS, and Δ P indicates that rotary power source main power source operational mode switches to energy storage main power source operational mode
The active transfer total amount of load in the process, Pbat_cap(k)、Pbat_cap(i) the specified function of kth platform, i-th energy storage PCS are respectively indicated
Rate, PdgIndicate that rotary power source main power source operational mode switches the total active defeated of preceding rotary power source to energy storage main power source operational mode
Out, Pdg_limit(j) jth platform rotary power source when rotary power source main power source operational mode switches to energy storage main power source operational mode is indicated
The active output limit value allowed before shutting down, 1≤j≤M, M are the number of units of rotary power source.
Further, energy storage is gradually adjusted in main power source flexible switching method under a kind of micro-capacitance sensor off-network mode
The active output of PCS is until each energy storage PCS exports the active method for reaching and calculating target value are as follows: according to time interval and adjusting
The active output that step-length gradually adjusts each energy storage PCS by platform reaches calculating target value until every energy storage PCS output is active, adjusts
Section step-length fixed value adjusting, which follows active variation caused by variation adjusting step-length, is permitting the disturbance that micro-capacitance sensor voltage and frequency generate
Perhaps in deviation range.
Further, main power source flexible switching method under a kind of micro-capacitance sensor off-network mode, rotary power source main power source
Operational mode switches in energy storage main power source operational mode method, adjusts energy storage PCS operational mode method particularly includes: gradually by
The energy storage PCS that platform control runs on PQ mode switchs to sagging or VSG operational mode.
Scheme, energy storage master are advanced optimized as main power source flexible switching method under a kind of micro-capacitance sensor off-network mode
When power supply operational mode turns the switching starting of rotary power source main power source operational mode, first according to the real-time traffic information meter of micro-capacitance sensor
Calculate the rotary power source quantity N that should startdg, then gradually start rotary power source by platform,Wherein, PbatTable
Show total active, P of the energy storage PCS before energy storage main power source operational mode switches to rotary power source main power source operational modedg_nomIt indicates
The rated capacity of separate unit rotary power source, when more rotary power source rated power are inconsistent in micro-grid system, Pdg_nomEqual to each
Minimum value in platform rotary power source rated power, β are coefficient, 0≤β≤1, symbolExpression rounds up.
Further, main power source flexible switching method under a kind of micro-capacitance sensor off-network mode is gradually starting by platform
During rotary power source, energy storage gradually is adjusted by platform as target to offset the inverse probability occurred after rotary power source simultaneous interconnecting
The power of PCS, method particularly includes:
It adjusts l platform energy storage PCS and PQ mode is switched to by sagging or VSG mode, after current rotary power source simultaneous interconnecting
The inverse probability of appearance adjusts the active output of l platform energy storage PCS, the target regulation power P of l platform energy storage PCSbat_adjust(l)
Are as follows: Pbat_adjust(l)=Pbat(l)-(Preverse+ΔPdev), reach charge power in the target regulation power of l platform energy storage PCS
When limit value, l platform energy storage PCS is adjusted by its charge power limit value and absorbs inverse probability,
It controls l+1 platform energy storage PCS and PQ mode is switched to by sagging or VGS mode, and adjust having for l+1 platform energy storage PCS
Function output, the target regulation power P of l+1 platform energy storage PCSbat_adjust(l+1) are as follows: Pbat_adjust(l+1)=Pbat(l+1)-
(Preverse+ΔPdev)+Pbat(l)+Pbat_climit(l), under the premise of meeting each energy storage PCS charge power limit value constraint, by
The secondary active output by platform adjusting energy storage PCS is eliminated up to inverse probability phenomenon,
Wherein, Pbat(l)、Pbat(l+1) current active power of l platform, l+1 platform energy storage PCS is respectively indicated,
Pbat_adjust(l)≥-Pbat_climit(l), Pbat_climit(l) the charge power limit value that l platform energy storage PCS allows, P are indicatedreverse
Indicate the inverse probability occurred after rotary power source simultaneous interconnecting, Δ PdevIt is expressed as ensuring eliminating inverse probability phenomenon and increased biasing
Amount, l are the positive integer less than energy storage PCS number of units.
Further, main power source flexible switching method under a kind of micro-capacitance sensor off-network mode, the operation of energy storage main power source
Pattern switching is into the method for rotary power source main power source operational mode, after the elimination of inverse probability phenomenon, adjusts each energy storage PCS operation
Mode and the active progressive transfer exported to realize load, method particularly includes:
Firstly, gradually running on sagging or VSG mode energy storage PCS by platform control switchs to PQ mode, in each storage of adjustment
The power of conversion front and back can be kept constant when PCS operational mode；
Then, the active output of each energy storage PCS is gradually adjusted by step-length by platform further according to energy-storage battery carrying capacity, until each
The active output of platform energy storage PCS, which meets, adjusts target value, the adjusting target value P of the active output of kth platform energy storage PCSbat_target(k)
Are as follows:Pbat_climit(k) indicate kth platform energy storage PCS's
Charge power limit value, α indicate that the carrying capacity SOC (k) of the controlled battery of kth platform energy storage PCS is less than its own carrying capacity lower limit value
SOCmin(k) charging coefficient when, 0 < α≤1, Pbat_dlimit(k) indicate that the discharge power limit value of kth platform energy storage PCS, λ indicate the
The carrying capacity SOC (k) of the controlled battery of k platform energy storage PCS is greater than its own carrying capacity upper limit value SOCmax(k) discharge coefficient when, 0 <
λ≤1。
Scheme, electric rotating are advanced optimized as main power source flexible switching method under a kind of micro-capacitance sensor off-network mode
The switching entry condition of source dump energy main power source is real according to rotary power source power output lower limit, energy-storage battery capacity and distributed generation resource
When permeability determine.
Scheme is advanced optimized as main power source flexible switching method under a kind of micro-capacitance sensor off-network mode, energy storage turns
The switching entry condition of rotary power source main power source is determined according to energy-storage battery carrying capacity and charge-discharge electric power.
The present invention by adopting the above technical scheme, has the advantages that the present invention can be led in the dump of off-network rotary power source
Based on the progressive transfer control of load when power supply flexibility switches, the impact in handoff procedure to system is substantially reduced, is realized soft
Mild-natured sliding seamless switching；When off-network energy storage turns the switching of rotary power source main power source flexibility based on rotary power source inverse probability and energy storage function
Rate is adjusted, effective protection rotary power source, and the intelligence for realizing energy storage PCS power adjusts and flexible smooth and seamless switching.Meanwhile
It is all used gradually by the progressive Controlling principle of platform in two kinds of flexible switching controls, can be widely applied to (such as MW grades of large-scale micro-capacitance sensor
Micro-capacitance sensor) off-grid operation when main power source smooth and seamless switching, enhance net system switching process in flexibility and flatness.
Detailed description of the invention
Fig. 1 is that micro-capacitance sensor off-network main power source flexibility switches schematic diagram.
Fig. 2 is energy-storage battery SOC interval division schematic diagram.
Fig. 3 is certain island microgrid main electrical scheme schematic diagram.
Fig. 4 is that bavin sends out dump energy main power source flexibility switching curve.
Fig. 5 is that energy storage turns bavin hair main power source flexibility switching curve.
Specific embodiment
Main power source flexible switching method under a kind of micro-capacitance sensor off-network mode provided by the invention, consider extensive micro-capacitance sensor from
Smooth and seamless in host's power supply handoff procedure switches demand, proposes progressive based on the progressive transfer of load and energy storage PCS power
The flexible switching method of adjusting, and give the calculation method of the transfer control amount in related switching control.With reference to the accompanying drawing
Illustrate inventive concept of the invention.
Main power source flexible switching method under micro-capacitance sensor off-network mode is as shown in Figure 1, specifically include that rotary power source dump energy
The switching of main power source flexibility, energy storage turn the switching of rotary power source main power source flexibility.The rotary power source in micro-capacitance sensor mainly has diesel oil at present
Generator, small size gas turbine etc..It is illustrated below for two kinds of main power source flexibility handoff technique schemes.
1) rotary power source dump energy main power source flexibility handoff technique scheme
(1) rotary power source dump energy main power source flexibility switching starting when meeting switching entry condition
Consider that rotary power source performance driving economy and energy-storage battery capacity-constrained, entry condition are typically based on rotation in Practical Project
Turn power supply power output lower limit, energy-storage battery capacity and the real-time permeability of distributed generation resource to be formulated.Such as: entry condition is settable
Are as follows: rotary power source active power output is less than the 10% of rated power, and current energy-storage battery SOC is in [60%, 85%] range, and
Real-time permeability (real-time permeability=photovoltaic and blower output are total active/(rotary power source the is active+storage of current photovoltaic and blower
Active+the photovoltaic of energy and blower output are total active), it is specified that energy storage discharge power is positive) it is greater than 90%.
(2) the progressive transfer control of load
The progressive transfer for carrying out load after starting conversion first, that is, gradually reduce the active and idle output of rotary power source, increases
Add energy storage active and idle output, the sub-load for gradually undertaking rotary power source is transferred to energy storage, to avoid system frequency
Greater impact is born with voltage, avoids unstability in net system switching process, realizes flexible smooth and seamless switching.
Rotary power source is done under the operational mode of main power source, and energy storage PCS runs on PQ mode.It is shut down according to every rotary power source
When reduce it is active system frequency and voltage will not be caused greater impact be target, by the way that energy storage PCS power is adjusted
And the purpose for adjusting rotary power source power is realized indirectly.Calculating for load transfer amount, energy storage PCS power regulation target value,
It can specifically be calculated by following formula:
Wherein, PdgIndicate total active output of rotary power source before switching starts；Pdg_limit(j) indicate that jth platform revolves when switching
Turning the active output limit value allowed before power supply is shut down, (limit value is that stop moment generates disturbance to micro-capacitance sensor voltage and frequency
Allow maximum value), 1≤j≤M, rotary power source amounts to M platform, M >=1；Δ P indicates the active transfer total amount of load in switching control；
Pbat(k) the active output of current kth platform energy storage PCS before switching starting is indicated, 1≤k≤N, energy storage PCS amount to N platform, N >=1,
Regulation electric discharge is positive；Pbat_cap(k)、Pbat_cap(i) rated power of kth platform, i-th energy storage PCS are respectively indicated；Pbat_goal
(k) the active calculating target value of kth platform energy storage PCS is indicated.Pay attention to realize the progressive transfer of load avoiding that system is caused to rush
It hits, the power regulation of energy storage PCS is according at interval of Δ T time, adjusting step-length PstepGradually every active is adjusted to by platform
Target value adjusts step-length fixed value adjusting and follows what active variation caused by variation adjusting step-length generated micro-capacitance sensor voltage and frequency
Disturbance is within the scope of tolerance.Therefore, while gradually adjusting energy storage PCS has work value, rotary power source has work value then right
It is progressively smaller until that rotary power source meets P with answeringdg(j)≤Pdg_limit(j), Pdg(j) indicate that jth platform rotary power source stops when switching
Active output before machine.
(3) energy storage PCS operational mode adjusts
After the completion of the progressive transfer control of load, more energy storage PCS still run on PQ mode, to realize master when off-grid operation
Power supply switching, must gradually control energy storage PCS and switch to sagging or VSG mode.Energy storage PCS is sagging and VSG mode may be implemented and revolve
Turn the combined operating of power supply, and PQ turns active when sagging or VSG mode and reactive power fluctuation very little, and V/F mode cannot be with rotation
Power supply combined operating, therefore the sagging or VSG technology based on energy storage PCS realizes the switching of main power source.
When energy storage PCS operational mode adjusts, to maximize the impact reduced to system, using gradually by platform control energy storage
PCS switchs to sagging or VSG operational mode by PQ.
(4) rotary power source shuts down control
After energy storage PCS switchs to sagging or VSG operational mode, delay a period of time (in Practical Project be usually 30s~
1min) i.e. controllable rotary power source is shut down afterwards.Similarly, it to maximize the impact for reducing rotary power source shutdown to system, uses
It gradually stops rotating power supply by platform, i.e., only one rotary power source of control is shut down every time, is shut down and is postponed to a upper rotary power source
Next rotary power source is controlled again after certain time (being usually 30s~1min in Practical Project) to shut down.
2) energy storage turns rotary power source main power source flexibility handoff technique scheme
(1) rotary power source dump energy main power source flexibility switching starting when meeting switching entry condition
Consider that energy-storage battery charge-discharge electric power and capacity-constrained, entry condition are typically based on energy-storage battery and put in Practical Project
Electrical power and capacity are formulated.Such as entry condition may be configured as energy-storage battery SOC lower than 50% or energy-storage battery discharges
Power is greater than the 60% of nominal discharge power.
(2) rotary power source starting and inverse probability control
After switching starting, need to calculate the rotary power source quantity that should start according to real-time traffic information first, then gradually by
Platform starts rotary power source.The number calculation formula that rotary power source should start is shown below:
Wherein, NdgIndicate the quantity that rotary power source should start；PbatIndicate energy storage PCS before the handover total active；Pdg_nom
The rated capacity for indicating separate unit rotary power source, when more rotary power source rated power are inconsistent in micro-grid system, Pdg_nom=
min(Pdg_nom_min,Pdg_nom_max), i.e. Pdg_nomEqual to the minimum value in each rotary power source rated power, Pdg_nom_max、
Pdg_nom_minRespectively indicate maximum value, the minimum value in each rotary power source rated power；β is coefficient, and 0≤β≤1 usually takes
It is worth range in 0.3≤β≤0.8；SymbolExpression rounds up.
(3) energy storage PCS mode adjustment and power regulation
Micro-grid system is in equilibrium state before rotary power source starting, and generates in rotary power source simultaneous interconnecting moment
Impact may result in energy storage PCS increase output power, easily cause rotary power source inverse probability phenomenon, but inverse probability is to rotation
Power supply is affected, and can cause unit into equal problem when serious, therefore inverse probability control must be carried out after rotary power source simultaneous interconnecting
System.During gradually starting rotary power source by platform, to eliminate the inverse probability occurred after every rotary power source simultaneous interconnecting, palpus
Rotary power source power is adjusted indirectly by adjusting energy storage PCS power.To reduce storage energy operation patterns of change and changed power
Impact, when there is inverse probability in rotary power source simultaneous interconnecting, can by energy storage PCS carry out inverse probability adjust control, i.e., first
Control 1 (such as control l platform) energy storage PCS switchs to PQ mode by sagging or VSG mode, then according to the inverse of current rotary power source
Power to l platform energy storage PCS carry out power regulation (in practical control process for avoid power generate larger fluctuation, need to be in energy storage
Power adjustment instruction is issued before the conversion of PCS mode, so that it is guaranteed that directly in response to the instruction after energy storage PCS switchs to PQ).L
The target regulation power calculation formula of platform energy storage PCS is shown below:
Pbat_adjust(l)=Pbat(l)-(Preverse+ΔPdev) (3)
Wherein, PreverseThe inverse probability of outlet is, it is specified that inverse probability value is positive after expression rotary power source simultaneous interconnecting；ΔPdev
It is expressed as ensuring to eliminate inverse probability phenomenon and increased amount of bias, the value are positive；Pbat(l) l for adjusting inverse probability is indicated
The current active power of platform energy storage PCS is, it is specified that electric discharge is positive；Pbat_adjust(l) indicate that the target of l platform energy storage PCS adjusts function
Rate, and P must be metbat_adjust(l)≥-Pbat_climit(l), Pbat_climit(l) charge power that l platform energy storage PCS allows is indicated
(charge power is negative limit value, but Pbat_climit(l) negative sign is free of).Work as Pbat_adjust(l)<-Pbat_climit(l) when: then controlling
L platform energy storage PCS reaches maximum charge power；Other 1 (such as control l+1 platform) energy storage PCS is controlled simultaneously by sagging or VSG mould
Formula switchs to PQ mode, and adjusts its output power, the target regulation power P of l+1 platform energy storage PCSbat_adjust(l+1) it calculates public
Formula are as follows:
Pbat_adjust(l+1)=Pbat(l+1)-(Preverse+ΔPdev)+Pbat(l)+Pbat_climit(l) (4)
Wherein, Pbat(l+1) current active power for being l+1 platform energy storage PCS.
(4) operational mode that each energy storage PCS is adjusted after the elimination of inverse probability phenomenon and active output are to realize load gradually
Into transfer
It proposes to carry out power adjustment based on the section energy-storage battery difference SOC.As shown in Fig. 2, being based on definite value SOCmin(under SOC
Limit value) and SOCmaxEnergy-storage battery SOC is divided into 3 regions by (SOC upper limit value): SOC is relatively low, normal and higher region.Therefore
Power adjustment calculation formula based on SOC range is shown below:
Wherein, Pbat_target(k) the adjusting target value of the active output of kth platform energy storage PCS is indicated, it is specified that electric discharge is positive；
Pbat_climit(k) the charge power limit value of kth platform energy storage PCS is indicated, which is negative；Charging coefficient when α expression SOC is relatively low, 0
<α≤1；Pbat_dlimit(k) the discharge power limit value of kth platform energy storage PCS is indicated, which is positive；λ indicates electric discharge when SOC is higher
Coefficient, 0 < λ≤1；SOCmin(k) the SOC lower limit value of the controlled battery of kth platform energy storage PCS is indicated；SOCmax(k) energy storage of kth platform is indicated
The SOC upper limit value of the controlled battery of PCS.
In addition, first power control instruction is issued in energy storage PCS power adjustment, then control its carry out mode again
Switching.And to reduce impact of the handoff procedure to system, equally gradually (lead in Practical Project by platform according to certain delay time
Often power instruction is carried out for 30s~1min) to issue and PCS pattern switching.
Fig. 3 is China's island microgrid primary connection circuit schematic diagram, and micro-grid system is typical 10kV ring network framework,
The multibreak wire-outgoing breaker for opening downside in diesel generating set station when normal operation, using open loop operation.Micro-capacitance sensor is connected to diesel oil
Power station, the power station have 3 1.25MVA diesel-driven generators, therefore the rotary power source in the micro-capacitance sensor i.e. 3 diesel oil thus
Generator；The system other side is connected to 10kV switchyard, and the energy-storage system of 4 sets of 1.2MWh accesses switchyard through 400V ac bus,
PCS (i.e. AC/DC bi-directional inverter in attached drawing) rated power in every set energy-storage system is 500kW, and Simultaneous Switching station is connected to 3
The stall-controlled wind turbines of 750kW；4 ring network cabinets are had in looped network, to power for load on island.
The island microgrid mainly runs on off-network mode, and the switching of off-network main power source flexibility specifically includes that bavin sends out dump energy
The switching of main power source flexibility, energy storage turn bavin hair main power source flexibility switching.It is soft for two kinds of main power sources below in conjunction with the island microgrid
The specific implementation process of property handoff technique scheme is illustrated.
1) bavin hair dump energy main power source flexibility switching
(1) bavin hair dump energy main power source flexibility switches entry condition
Consider bavin hair performance driving economy and energy-storage battery capacity-constrained, while being the flexible switching of triggering, related definite value is increased
Greatly, entry condition is set as only 1 bavin shipping row in example and active power output is less than 600kW, energy-storage battery SOC [60%,
85%] in range, the real-time permeability of current blower is greater than 50%, and current blower exports the active wave within the scope of 600~650kW
It is dynamic.Triggering bavin hair dump energy main power source flexibility switching starting after entry condition meets.
(2) the progressive transfer control of load
When bavin sends out main power source operation, energy storage PCS runs on PQ mode.To reduce when bavin hair is shut down to system frequency and voltage
Impact, be arranged Pdg_limitIt adjusts step-length for 150kW, energy storage PCS and is also configured as 120kW, the control interval time is set as 10s.
(abscissa is time, unit min) as shown in Figure 4, the PQ mode based on energy storage PCS gradually respectively carry out 4 sets of energy storage active
It adjusts, adjusts 4 times altogether, and the active power of bavin hair also declines 4 times therewith, when each power regulation, can cause one to system voltage
Standing wave is dynamic, but is held in zone of reasonableness, causes system great fluctuation process to even result in system so as to avoid by single adjusting
The case where unstability, occurs.Make bavin send out active after decline and be less than 150kW, meets the adjustment of energy storage PCS operational mode and bavin hair is shut down
Condition.
(3) energy storage PCS operational mode adjusts
As shown in figure 4,4 sets of energy storage PCS then gradually switch to sagging operational mode by PQ by platform, work is converted in PCS mode
System voltage is not impacted substantially in journey, seamlessly transits system.
(4) bavin hair shuts down control
As shown in figure 4, then postponing short period control bavin hair after energy storage PCS all switchs to sagging operational mode and shutting down.
To system voltage substantially without impact when bavin hair is shut down, generated voltage raising is the sagging target voltage of energy storage PCS and Chai Fayun
Target voltage when row is there are caused by certain deviation, and voltage is then basically stable at 10.38kV when subsequent energy storage main power source is run
Left and right.
(1)~(4) complete micro-capacitance sensor and send out flexibility switching of the main power source to energy storage main power source from bavin through the above steps, keep away
Exempt from the system unstability risk in handoff procedure, reduced system shock, realizes smooth and seamless switching.
2) energy storage turns bavin hair main power source flexibility switching
(1) bavin hair dump energy main power source flexibility switches entry condition
Consider energy-storage battery charge-discharge electric power and capacity-constrained, while being the flexible switching of triggering, entry condition is set as storing up
Energy battery SOC is lower than 70% or energy-storage battery discharge power is greater than 60% (every PCS nominal discharge of nominal discharge power
Power is 300kW, 4 total 1.2MW).As shown in figure 5, the total active about 520kW of 4 sets of energy storage PCS, battery SOC 69%,
Lower than setting value, flexible switching starting is triggered.
(2) rotary power source starting and inverse probability control
Separate unit bavin sends out rated power Pdg_nom0.6 is set as 1MW, β, the total active P of energy storage PCSbatCurrent value is 500kW.
Therefore 1 Tai Chaifa should be started by being obtained according to the number calculation formula that rotary power source should start.
3 Tai Chaifa parameters are consistent in micro-capacitance sensor, when starting bavin is sent out, the longest bavin hair of selection starting downtime.Such as Fig. 5 institute
Show inverse probability phenomenon in short-term occur after bavin hair simultaneous interconnecting, inverse probability maximum value is about 25kW, passes through tune to eliminate inverse probability
Energy storage PCS power is saved to realize.Amount of bias Δ P is setdevFor 150kW, then selectes the maximum PCS of energy storage discharge power and be reduced by about
120kW, and control it and switch to PQ operational mode by sagging, to eliminate bavin hair inverse probability.
(3) energy storage PCS mode adjustment and power regulation
Bavin hair starting it is grid-connected after, control other energy storage PCS by it is sagging switch to PQ operational mode and adjust energy storage PCS power with
Eliminate the grid-connected rear inverse probability phenomenon occurred of bavin hair starting.Eliminate inverse probability phenomenon after, based on the section energy-storage battery difference SOC into
Row power adjustment.3 regions divided as shown in Figure 2, the SOC of setting everyminAnd SOCmaxRespectively 65% and 80%, therefore
The active target of every energy storage PCS is all 0kW.Then power control instruction is issued to every energy storage PCS, therefore such as Fig. 5 institute
Show, the energy storage PCS (having switched to PQ mode) for eliminating inverse probability has then responded to active regulating command.Again according to delay
The mode of 10s gradually controls other 3 energy storage PCS adjustment operational mode (switching to PQ mode) and active power by platform.
(1)~(3) complete flexible switching of the micro-capacitance sensor from energy storage main power source to bavin hair main power source through the above steps, keep away
Exempt from bavin hair long-time inverse probability operation risk, reduced system shock, realizes smooth and seamless switching.
In conclusion the present invention is when off-network rotary power source dump energy main power source flexibility switches based on the progressive transfer control of load
System, substantially reduces the impact in handoff procedure to system.It is based on when off-network energy storage turns the switching of rotary power source main power source flexibility
Rotary power source inverse probability and energy storage power regulation, effective protection rotary power source, the intelligence for realizing energy storage PCS power are adjusted.
Meanwhile using gradually by the progressive Controlling principle of platform, the impact in handoff procedure to system is reduced to the maximum extent, it can be extensive
Main power source smooth and seamless switching when applied to large-scale micro-capacitance sensor (such as MW grades of micro-capacitance sensor) off-grid operation, was switched with enhancing system
Flexibility and flatness in journey.
Claims (7)
1. main power source flexible switching method under a kind of micro-capacitance sensor off-network mode characterized by comprising
The method that rotary power source main power source operational mode switches to energy storage main power source operational mode:
When meeting the switching entry condition of rotary power source dump energy main power source, will be revolved using the control mode of the progressive transfer of load
Turn the load that power supply undertakes and be gradually transferred to energy storage, micro-capacitance sensor voltage and frequency are generated with every rotary power source stop moment
Disturbance is target within the scope of tolerance, gradually adjusts the active output of energy storage PCS until each energy storage PCS exports active reach
To calculating target value, each energy storage PCS export active calculatings target value include its own active output par, c and according to it oneself
The active transfer amount part of the load that body rated power accounting undertakes adjusts energy storage PCS operational mode, and control rotary power source is shut down,
The switching entry condition of rotary power source dump energy main power source is according to rotary power source power output lower limit, energy-storage battery capacity and distribution
The real-time permeability of power supply determines；
The method that energy storage main power source operational mode switches to rotary power source main power source operational mode:
When meeting energy storage and turning the switching entry condition of rotary power source main power source, start rotary power source, it is same to offset rotary power source
The inverse probability occurred after phase is grid-connected is the power that target adjusts part energy storage PCS, after the elimination of inverse probability phenomenon, gradually by platform control
System runs on sagging or VSG mode energy storage PCS and switchs to PQ mode, and conversion is kept when adjusting each energy storage PCS operational mode
The power of front and back is constant, gradually adjusts the active output of each energy storage PCS by step-length by platform further according to energy-storage battery carrying capacity, until
The active output of each energy storage PCS, which meets, adjusts target value, adjusts each energy storage PCS operational mode and active output to realize load
Progressive transfer, the switching entry condition that energy storage turns rotary power source main power source are true according to energy-storage battery carrying capacity and charge-discharge electric power
It is fixed.
2. main power source flexible switching method under a kind of micro-capacitance sensor off-network mode according to claim 1, which is characterized in that revolving
Turn power supply main power source operational mode to switch to during energy storage main power source operational mode, the active calculating target of kth platform energy storage PCS
Value Pbat_goal(k) are as follows:Pbat(k) table
Show kth platform energy storage PCS rotary power source main power source operational mode to energy storage main power source operational mode switching before active output, 1
≤ k≤N, N are the number of units of energy storage PCS, and Δ P indicates that rotary power source main power source operational mode switches to energy storage main power source operational mode
The active transfer total amount of load in the process, Pbat_cap(k)、Pbat_cap(i) the specified function of kth platform, i-th energy storage PCS are respectively indicated
Rate, PdgIndicate that rotary power source main power source operational mode switches the total active defeated of preceding rotary power source to energy storage main power source operational mode
Out, Pdg_limit(j) jth platform rotary power source when rotary power source main power source operational mode switches to energy storage main power source operational mode is indicated
The active output limit value allowed before shutting down, 1≤j≤M, M are the number of units of rotary power source.
3. main power source flexible switching method under a kind of micro-capacitance sensor off-network mode according to claim 2, which is characterized in that gradually
The active output of energy storage PCS is adjusted until each energy storage PCS exports the active method for reaching and calculating target value are as follows: according between the time
Reach calculating until every energy storage PCS output is active every the active output for gradually adjusting each energy storage PCS by platform with adjusting step-length
Target value adjusts step-length fixed value adjusting and follows what active variation caused by variation adjusting step-length generated micro-capacitance sensor voltage and frequency
Disturbance is within the scope of tolerance.
4. main power source flexible switching method under a kind of according to claim 1 or 2 or 3 micro-capacitance sensor off-network modes, feature exist
In the rotary power source main power source operational mode switches in energy storage main power source operational mode method, adjusts energy storage PCS and runs mould
Formula method particularly includes: the energy storage PCS for gradually running on PQ mode by platform control switchs to sagging or VSG operational mode.
5. main power source flexible switching method under a kind of micro-capacitance sensor off-network mode according to claim 1, which is characterized in that energy storage
When main power source operational mode turns the switching starting of rotary power source main power source operational mode, first according to the real-time traffic information of micro-capacitance sensor
Calculate the rotary power source quantity N that should startdg, then gradually start rotary power source by platform,Wherein, Pbat
Indicate total active, P of the energy storage PCS before energy storage main power source operational mode switches to rotary power source main power source operational modedg_nomTable
The rated capacity for showing separate unit rotary power source, when more rotary power source rated power are inconsistent in micro-grid system, Pdg_nomIt is equal to
Minimum value in each rotary power source rated power, β are coefficient, 0≤β≤1, symbolExpression rounds up.
6. main power source flexible switching method under a kind of micro-capacitance sensor off-network mode according to claim 5, which is characterized in that by
It is target gradually by platform to offset the inverse probability occurred after rotary power source simultaneous interconnecting during the secondary starting rotary power source by platform
The power of energy storage PCS is adjusted, method particularly includes:
It adjusts l platform energy storage PCS and PQ mode is switched to by sagging or VSG mode, according to occurring after current rotary power source simultaneous interconnecting
Inverse probability adjust l platform energy storage PCS active output, the target regulation power P of l platform energy storage PCSbat_adjust(l) are as follows:
Pbat_adjust(l)=Pbat(l)-(Preverse+ΔPdev), reach charge power limit in the target regulation power of l platform energy storage PCS
When value, l platform energy storage PCS is adjusted by its charge power limit value and absorbs inverse probability,
It controls l+1 platform energy storage PCS and PQ mode is switched to by sagging or VGS mode, and adjust the active defeated of l+1 platform energy storage PCS
Out, the target regulation power P of l+1 platform energy storage PCSbat_adjust(l+1) are as follows: Pbat_adjust(l+1)=Pbat(l+1)-(Preverse
+ΔPdev)+Pbat(l)+Pbat_climit(l), under the premise of meeting each energy storage PCS charge power limit value constraint, gradually by platform
The active output of adjusting energy storage PCS is eliminated up to inverse probability phenomenon,
Wherein, Pbat(l)、Pbat(l+1) current active power of l platform, l+1 platform energy storage PCS, P are respectively indicatedbat_adjust(l)
≥-Pbat_climit(l), Pbat_climit(l) the charge power limit value that l platform energy storage PCS allows, P are indicatedreverseIndicate electric rotating
The inverse probability occurred after the simultaneous interconnecting of source, Δ PdevBe expressed as ensuring eliminating inverse probability phenomenon and increased amount of bias, l be less than
The positive integer of energy storage PCS number of units.
7. main power source flexible switching method under a kind of micro-capacitance sensor off-network mode according to claim 1 or 6, which is characterized in that
Energy storage main power source operational mode switches in the method for rotary power source main power source operational mode, the active output of kth platform energy storage PCS
Adjust target value Pbat_target(k) are as follows:Pbat_climit
(k) indicate that the charge power limit value of kth platform energy storage PCS, α indicate that the carrying capacity SOC (k) of the controlled battery of kth platform energy storage PCS is less than
Its own carrying capacity lower limit value SOCmin(k) charging coefficient when, 0 < α≤1, Pbat_dlimit(k) indicate kth platform energy storage PCS's
Discharge power limit value, λ indicate that the carrying capacity SOC (k) of the controlled battery of kth platform energy storage PCS is greater than its own carrying capacity upper limit value
SOCmax(k) discharge coefficient when, 0 λ≤1 <.
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