CN106169752A - Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern - Google Patents
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern Download PDFInfo
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- CN106169752A CN106169752A CN201610861064.XA CN201610861064A CN106169752A CN 106169752 A CN106169752 A CN 106169752A CN 201610861064 A CN201610861064 A CN 201610861064A CN 106169752 A CN106169752 A CN 106169752A
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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 method under a kind of micro-capacitance sensor off-network pattern, belong to power system micro-capacitance sensor and run the technical field controlled.Or VSG technology sagging based on energy storage PCS, uses the flexible smooth-switching method of the progressive transfer of load, it is achieved under micro-capacitance sensor off-network pattern, 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 method under a kind of micro-capacitance sensor off-network pattern, belong to power system micro-capacitance sensor
Run the technical field controlled.
Background technology
Due to developing rapidly of power electronics and new energy technology, micro-capacitance sensor technology has obtained increasing application, becomes
For solving the important channel of the regional power supply such as island, remote High aititude.Micro-capacitance sensor as one of the important form of distributed power generation,
It is an autonomous system being capable of oneself's operational management, both can be incorporated into the power networks with bulk power grid, it is also possible to isolated power grid is (also
Claim off-network run or islet operation), therefore micro-capacitance sensor has the method for operation flexibly, improve system run stability and can
By property.
Owing to there are grid-connected and two kinds of operational modes of off-network in micro-capacitance sensor, therefore about cutting between grid-connected and off-network operational mode
Change into and run, for micro-capacitance sensor, the important research direction controlled.Switching between micro-grid connection and off-network pattern totally can be divided into also
Net leaves the switching of net pattern and off-network turns grid-connect mode switching.Carry out the most according to schedule being divided into plan according to pattern switching
Switching with unplanned pattern, some, according to whether there is power failure process in handoff procedure, is classified as seamed and seamless switching.Mesh
Before, net being left for micro-grid connection and off-network turns in the switching of grid-connected both of which, off-network turns grid-connect mode handoff technique difficulty
It is little, it is easy to accomplish, and if grid-connected leaving the switching of net pattern to realize unplanned seamless switching technique difficulty bigger.The most grid-connected
Leave net pattern switching correlational study and patent is more, such as " microgrid operational mode seamless switching based on virtual synchronous electromotor
Control strategy " a kind of parallel changing method followed based on controller state of middle proposition, i.e. the current source mode of PQ control and VSG
Phase place and the electric current of the voltage source mode that (virtual synchronous electromotor, Virtual Synchronous Generator) controls refer to
Make all real-time trackings, thus realize the seamless switching of operational mode；" micro-grid connection based on GOOSE leaves net and takes over seamlessly
Intelligent control method " patent proposes a kind of realize micro-grid connection based on GOOSE quick control net and leave net and take over seamlessly
Intelligent control method.
Although the switching of micro-grid connection and two kinds of operational modes of off-network is most important, but some are only run on from
For the micro-capacitance sensor of net pattern, the switching of off-grid stable operation and main power source is to realize the important guarantor that system is run steadily in the long term
Card.Some off-network type micro-capacitance sensor both contained tradition rotary power source (such as diesel-driven generator, gas turbine), also containing new distribution type
Power supply and energy storage, be in operation and can have rotary power source and energy storage as system main power source, and energy storage is made main power source and run often
The operational mode seen is V/F or sagging (VSG) operational mode.After distributed power source accesses micro-capacitance sensor in a large number, for realizing micro-electricity
, there is the power work that stops the rotation in net economical operation, the demand that energy storage runs separately as main power source, this and conventional electric rotating
Decide the main power source switching control then existing under off-network pattern between power operating mode in source.Currently for containing rotary power source
With the micro-capacitance sensor of energy storage, off-network generally uses rotary power source main power source stable operation when running.But it is bigger in some energy storage proportionings
Off-network type micro-capacitance sensor in, sometimes because of rotary power source maintenance or failure and other reasons, exist energy storage do main power source run control need
Asking, therefore, main power source switching when off-network is run in micro-capacitance sensor is also requisite pattern switching control technology.Due to domestic
Longtime running is less in the micro-capacitance sensor of off-network pattern, so the pertinent literature of main power source switching when running off-network and patent are relatively
Few." a kind of independent operating micro-grid master control power-supply switching method " patent proposes main electricity when a kind of micro-capacitance sensor off-network is run
Source switch method, but this patent primarily focuses on the entry condition illustrating main power source switching, describes rotation briefly simultaneously
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 disturbance in the switching of the off-network main power source in extensive micro-capacitance sensor and the most even switches
Failed risk, thus be not suitable in extensive micro-capacitance sensor off-network main power source switching control.
Summary of the invention
The goal of the invention of the present invention is the deficiency for above-mentioned background technology, it is provided that main under a kind of micro-capacitance sensor off-network pattern
Power supply flexible switching method, it is proposed that based on energy storage PCS (current transformer, Power Control System) is sagging or VSG is (virtual
Synchronous generator, Virtual Synchronous Generator) technology, use the flexibility of the progressive transfer of load to take over seamlessly
Method, it is achieved under micro-capacitance sensor off-network (or being referred to as " lonely net ") pattern, 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, solves existing micro-capacitance sensor the biggest
When scale micro-capacitance sensor off-network (isolated island) is run, in main power source handoff procedure, system voltage and frequency bear the skill of relatively large disturbances impact
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 pattern, including:
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, use the control mode of the progressive transfer of load
The load undertaken by rotary power source is gradually transferred to energy storage, regulates energy storage PCS operational mode, controls rotary power source and shuts down；
The method that energy storage main power source operational mode switches to rotary power source main power source operational mode:
When meeting the switching entry condition that energy storage turns 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 of target regulation part energy storage PCS, and after inverse probability phenomenon eliminates, regulation is each
Energy storage PCS operational mode and meritorious output are with the progressive transfer realizing load.
As the further prioritization scheme of main power source flexible switching method under described a kind of micro-capacitance sensor off-network pattern, rotating
During power supply main power source operational mode switches to energy storage main power source operational mode, the control mode using the progressive transfer of load will
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 produce be target in the range of tolerance, gradually regulates the meritorious output of energy storage PCS until each storage
Can export the meritorious calculating desired value that reaches by PCS, each energy storage PCS output meritorious calculating desired value comprises output unit of himself gaining merit
Point and the load that undertakes according to himself rated power accounting gain merit transfer amount part, wherein,
Meritorious calculating desired value P of kth platform energy storage PCSbat_goal(k) be: Pbat(k) represent kth platform energy storage PCS in rotary power source main power source operational mode to the main electricity of energy storage
Meritorious output before the operational mode switching of source, 1≤k≤N, N are the number of units of energy storage PCS, and Δ P represents that rotary power source main power source runs
Pattern load in energy storage main power source operational mode handoff procedure meritorious transfer total amount, Pbat_cap(k)、Pbat_cap(i) table respectively
Show kth platform, the rated power of i-th energy storage PCS, PdgRepresent that rotary power source main power source operational mode runs mould to energy storage main power source
The total meritorious output of rotary power source, P before formula switchingdg_limitJ () represents that rotary power source main power source operational mode is to energy storage main power source
The meritorious output limit value that during operational mode switching, jth platform rotary power source allows before shutting down, 1≤j≤M, M are the platform of rotary power source
Number.
Further, under described a kind of micro-capacitance sensor off-network pattern in main power source flexible switching method, energy storage is gradually regulated
The meritorious output of PCS until each energy storage PCS output meritorious reach to calculate desired value method be: according to time interval and regulation
Step-length gradually regulates the meritorious output of each energy storage PCS by platform until every meritorious reaching of energy storage PCS output calculates desired value, adjusts
Joint step-length fixed value adjusting is followed the disturbance that micro-capacitance sensor voltage and frequency produces by the change regulation meritorious change that causes of step-length and is being permitted
Permitted in deviation range.
Further, main power source flexible switching method under described a kind of micro-capacitance sensor off-network pattern, rotary power source main power source
Operational mode switches in energy storage main power source operational mode method, regulation energy storage PCS operational mode method particularly includes: gradually by
Platform controls to run on the energy storage PCS of PQ pattern and transfers sagging or VSG operational mode to.
As the further prioritization scheme of main power source flexible switching method, energy storage master under described a kind of micro-capacitance sensor off-network pattern
When power supply operational mode turns the switching startup of rotary power source main power source operational mode, first according to the real-time traffic information meter of micro-capacitance sensor
Rotary power source quantity N that calculation should startdg, the most gradually start rotary power source by platform,Wherein, PbatTable
Show that energy storage PCS is at energy storage main power source operational mode always gaining merit before rotary power source main power source operational mode switches, Pdg_nomRepresent
The rated capacity of separate unit rotary power source, when in micro-grid system, multiple stage rotary power source rated power is inconsistent, Pdg_nomEqual to each
Minima in platform rotary power source rated power, β is coefficient, 0≤β≤1, symbolExpression rounds up.
Further, main power source flexible switching method under described a kind of micro-capacitance sensor off-network pattern, gradually starting by platform
During rotary power source, gradually regulate energy storage by platform for target offsetting the inverse probability occurred after rotary power source simultaneous interconnecting
The power of PCS, method particularly includes:
Regulate l platform energy storage PCS and transferred to PQ pattern by sagging or VSG pattern, after current rotary power source simultaneous interconnecting
The inverse probability occurred regulates the meritorious output of l platform energy storage PCS, the target regulation power P of l platform energy storage PCSbat_adjust(l)
For: Pbat_adjust(l)=Pbat(l)-(Preverse+ΔPdev), the target at l platform energy storage PCS regulates power and reaches charge power
During limit value, regulate l platform energy storage PCS and absorb inverse probability by its charge power limit value,
Control l+1 platform energy storage PCS and transferred to PQ pattern by sagging or VGS pattern, and regulate having of l+1 platform energy storage PCS
Merit exports, the target regulation power P of l+1 platform energy storage PCSbat_adjust(l+1) it is: Pbat_adjust(l+1)=Pbat(l+1)-
(Preverse+ΔPdev)+Pbat(l)+Pbat_climit(l), on the premise of meeting each energy storage PCS charge power limit value constraint, by
Secondary by platform regulation energy storage PCS meritorious output until inverse probability phenomenon eliminate,
Wherein, Pbat(l)、Pbat(l+1) l platform, the current active power of l+1 platform energy storage PCS are represented respectively,
Pbat_adjust(l)≥-Pbat_climit(l), Pbat_climitL () represents the charge power limit value that l platform energy storage PCS allows, Preverse
The inverse probability occurred after representing rotary power source simultaneous interconnecting, Δ PdevThe biasing being expressed as guaranteeing to eliminate inverse probability phenomenon and increase
Amount, l is the positive integer less than energy storage PCS number of units.
Further, main power source flexible switching method under described a kind of micro-capacitance sensor off-network pattern, energy storage main power source runs
Pattern switches in the method for rotary power source main power source operational mode, after inverse probability phenomenon eliminates, regulates each energy storage PCS and runs
Pattern exports to realize the progressive transfer of load with meritorious, method particularly includes:
First, gradually control to run on sagging or VSG pattern energy storage PCS by platform and transfer PQ pattern to, adjusting each storage
The power before and after changing can be kept constant during PCS operational mode；
Then, gradually regulate the meritorious output of each energy storage PCS by step-length by platform further according to energy-storage battery carrying capacity, until respectively
The meritorious output of platform energy storage PCS meets regulation desired value, and kth platform energy storage PCS gains merit regulation desired value P of outputbat_target(k)
For:Pbat_climitK () represents kth platform energy storage PCS's
Charge power limit value, α represents that carrying capacity SOC (k) of kth platform the controlled battery of energy storage PCS is less than himself carrying capacity lower limit
SOCminCharging coefficient time (k), 0 < α≤1, Pbat_dlimitK () represents the discharge power limit value of kth platform energy storage PCS, λ represents the
Carrying capacity SOC (k) of k platform the controlled battery of energy storage PCS is more than himself carrying capacity higher limit SOCmaxDischarge coefficient time (k), 0 <
λ≤1。
As the further prioritization scheme of main power source flexible switching method, electric rotating under described a kind of micro-capacitance sensor off-network pattern
The switching entry condition of source dump energy main power source exerts oneself lower limit, energy-storage battery capacity and distributed power source in fact according to rotary power source
Time permeability determine.
As the further prioritization scheme of main power source flexible switching method under described a kind of micro-capacitance sensor off-network pattern, energy storage turns
The switching entry condition of rotary power source main power source determines according to energy-storage battery carrying capacity and charge-discharge electric power.
The present invention uses technique scheme, has the advantages that the present invention can lead in off-network rotary power source dump
Control based on the progressive transfer of load during the switching of power supply flexibility, substantially reduce the impact to system in handoff procedure, it is achieved that soft
Property smooth and 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 merit
Rate regulates, and effectively protects rotary power source, it is achieved that the Intelligent adjustment of energy storage PCS power and flexible smooth and seamless switching.Meanwhile,
Two kinds of flexible switching controls all have employed gradually by the progressive Controlling principle of platform, can be widely applied to large-scale micro-capacitance sensor (such as MW level
Micro-capacitance sensor) off-network main power source smooth and seamless switching when running, strengthen the flexibility in net system switching process and flatness.
Accompanying drawing explanation
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 dump energy main power source flexibility switching curve sent out by bavin.
Fig. 5 be energy storage turn bavin send out main power source flexibility switching curve.
Detailed description of the invention
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern that the present invention provides, it is considered to extensive micro-capacitance sensor from
Smooth and seamless switching demand in host's power supply handoff procedure, it is proposed that progressive based on the progressive transfer of load and energy storage PCS power
The flexible switching method of regulation, and give the computational methods of transfer controlled quentity controlled variable in relevant switching control.Below in conjunction with the accompanying drawings
Illustrate the inventive concept of the present invention.
Main power source flexible switching method under micro-capacitance sensor off-network pattern is as it is 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.Rotary power source in micro-capacitance sensor mainly has diesel oil at present
Electromotor, small size gas turbine etc..Illustrate 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) when meeting switching entry condition, the switching of rotary power source dump energy main power source flexibility starts
Considering rotary power source performance driving economy and energy-storage battery capacity-constrained in Practical Project, entry condition is typically based on rotation
Turn exert oneself lower limit, energy-storage battery capacity and the real-time permeability of distributed power source of power supply to formulate.Such as: entry condition can be arranged
For: rotary power source is gained merit and is exerted oneself less than the 10% of rated power, and current energy-storage battery SOC is in the range of [60%, 85%], and
The real-time permeability of current photovoltaic and blower fan (real-time permeability=photovoltaic and blower fan output total meritorious/(rotary power source is meritorious+storage
Can meritorious+photovoltaic and blower fan output total meritorious), it is stipulated that energy storage discharge power just be) be more than 90%.
(2) the progressive transfer of load controls
First carry out the progressive transfer of load after starting conversion, the most progressively reduce rotary power source and gain merit and idle output, increase
Add energy storage to gain merit and idle output, gradually the sub-load that rotary power source undertakes is transferred to energy storage, thus avoids system frequency
Greater impact is born, it is to avoid cause unstability in net system switching process, it is achieved flexible smooth and seamless switching with voltage.
Rotary power source does under the operational mode of main power source, and energy storage PCS runs on PQ pattern.Shut down according to every rotary power source
Time reduce meritorious system frequency and voltage will not to cause greater impact be target, by being adjusted energy storage PCS power
And indirectly realize regulating the purpose of rotary power source power.For load transfer amount, the calculating of energy storage PCS power adjustments desired value,
Specifically can be calculated by following formula:
Wherein, PdgRepresent that switching starts the total meritorious output of front rotary power source；Pdg_limitJth platform rotation when () represents switching j
(this limit value is stop moment and micro-capacitance sensor voltage and frequency is produced disturbance the meritorious output limit value allowed before turning power supply shutdown
Allow maximum), 1≤j≤M, rotary power source amounts to M platform, M >=1；Δ P represents load meritorious transfer total amount in switching control；
PbatK () represents the current kth platform energy storage PCS meritorious output before switching starts, 1≤k≤N, energy storage PCS amount to N platform, N >=1,
Regulation electric discharge is for just；Pbat_cap(k)、Pbat_capI () represents kth platform, the rated power of i-th energy storage PCS respectively；Pbat_goal
K () represents the meritorious calculating desired value of kth platform energy storage PCS.Note for realizing the progressive transfer of load, it is to avoid system is caused punching
Hitting, the power adjustments of energy storage PCS is according at interval of Δ T time, regulation step-length PstepGradually by meritorious to every of platform regulation
Desired value, regulation step-length fixed value adjusting follows what micro-capacitance sensor voltage and frequency were produced by the change regulation meritorious change that causes of step-length
Disturbance is in the range of tolerance.Therefore, gradually regulating while energy storage PCS has work value, rotary power source have work value the most right
Being progressively smaller until rotary power source meets P with answeringdg(j)≤Pdg_limit(j), PdgWhen () represents switching j, jth platform rotary power source stops
Meritorious output before machine.
(3) energy storage PCS operational mode adjusts
After load progressive transfer control completes, multiple stage energy storage PCS still runs on PQ pattern, for realizing master when off-network is run
Power supply switches, and must gradually control energy storage PCS and transfer sagging or VSG pattern to.Energy storage PCS is sagging and VSG pattern can realize and revolve
Turn the cooperation of power supply, and PQ turns meritorious during sagging or VSG pattern and reactive power fluctuation is the least, and V/F pattern can not be with rotation
Power supply cooperation, therefore based on energy storage PCS sagging or VSG technology realizes the switching of main power source.
When energy storage PCS operational mode adjusts, for maximizing the impact reduced system, use and gradually control energy storage by platform
PCS is transferred to sagging or VSG operational mode by PQ.
(4) rotary power source is shut down and is controlled
After energy storage PCS transfers sagging or VSG operational mode to, postpone a period of time (in Practical Project usually 30s～
Rotary power source can be controlled after 1min) shut down.Similarly, for maximizing the impact reducing rotary power source shutdown to system, use
Gradually stop the rotation power supply by platform, only control a rotary power source i.e. every time and shut down, treat that a rotary power source is shut down and postpones
Control next rotary power source 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) when meeting switching entry condition, the switching of rotary power source dump energy main power source flexibility starts
Considering energy-storage battery charge-discharge electric power and capacity-constrained in Practical Project, entry condition is typically based on energy-storage battery and puts
Electrical power and capacity are formulated.Such as entry condition may be configured as energy-storage battery SOC and is less than 50%, or energy-storage battery electric discharge
Power is more than the 60% of nominal discharge power.
(2) rotary power source starts and inverse probability controls
After switching starts, first need to calculate, according to real-time traffic information, the rotary power source quantity that should start, the most gradually by
Platform starts rotary power source.The number calculation formula that rotary power source should start is shown below:
Wherein, NdgRepresent the quantity that rotary power source should start；PbatRepresent energy storage PCS before the handover total meritorious；Pdg_nom
Represent the rated capacity of separate unit rotary power source, when multiple stage rotary power source rated power is inconsistent in micro-grid system, Pdg_nom=
min(Pdg_nom_min,Pdg_nom_max), i.e. Pdg_nomEqual to the minima in each rotary power source rated power, Pdg_nom_max、
Pdg_nom_minRepresent the maximum in each rotary power source rated power, minima respectively；β is coefficient, and 0≤β≤1 generally takes
Value scope is in 0.3≤β≤0.8；SymbolExpression rounds up.
(3) energy storage PCS mode adjustment and power adjustments
Before rotary power source starts, micro-grid system is in poised state, and produces in rotary power source simultaneous interconnecting moment
Impact may result in energy storage PCS increase output, easily cause rotary power source inverse probability phenomenon, but inverse probability be to rotation
Power supply impact is relatively big, unit can be caused to enter equal problem, therefore must carry out inverse probability control after rotary power source simultaneous interconnecting time serious
System.During gradually starting rotary power source by platform, for the inverse probability occurred after eliminating every rotary power source simultaneous interconnecting, palpus
By regulation energy storage PCS power and then indirect regulation rotary power source power.For reducing 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 regulation control, the most first
Control 1 (as controlled l platform) energy storage PCS and transferred to PQ pattern by sagging or VSG pattern, then inverse according to current rotary power source
Power l platform energy storage PCS is carried out power adjustments (actual control during for avoiding power generation larger fluctuation, need to be in energy storage
Power adjustment instruction is issued before PCS patten transformation, so that it is guaranteed that directly in response to this instruction after energy storage PCS transfers PQ to).L
The target regulation rating formula of platform energy storage PCS is shown below:
Pbat_adjust(l)=Pbat(l)-(Preverse+ΔPdev) (3)
Wherein, PreverseThe inverse probability of outlet after expression rotary power source simultaneous interconnecting, it is stipulated that inverse probability value is just；ΔPdev
The amount of bias being expressed as guaranteeing to eliminate inverse probability phenomenon and increase, this value is just；PbatL () represents the l for regulating inverse probability
The current active power of platform energy storage PCS, it is stipulated that discharge for just；Pbat_adjustL () represents the target regulation merit of l platform energy storage PCS
Rate, and P must be metbat_adjust(l)≥-Pbat_climit(l), Pbat_climitL () represents the charge power that l platform energy storage PCS allows
Limit value (charge power is negative, but Pbat_climitL () does not contains negative sign).Work as Pbat_adjust(l)<-Pbat_climitTime (l): then control
L platform energy storage PCS reaches maximum charge power；Control other 1 (as controlled l+1 platform) energy storage PCS by sagging or VSG mould simultaneously
Formula transfers PQ pattern to, and regulates its output, the target regulation power P of l+1 platform energy storage PCSbat_adjust(l+1) public affairs are calculated
Formula is:
Pbat_adjust(l+1)=Pbat(l+1)-(Preverse+ΔPdev)+Pbat(l)+Pbat_climit(l) (4)
Wherein, Pbat(l+1) it is the current active power of l+1 platform energy storage PCS.
(4) after inverse probability phenomenon eliminates, the operational mode of each energy storage PCS and meritorious output are regulated to realize load gradually
Enter transfer
Propose to carry out power adjustment based on energy-storage battery difference SOC interval.As in figure 2 it is shown, based on definite value SOCmin(under SOC
Limit value) and SOCmaxEnergy-storage battery SOC is divided into 3 region: SOC regions on the low side, normal and higher by (SOC higher limit).Therefore
Power Adjustable calculation formula based on SOC scope is shown below:
Wherein, Pbat_target(k) represent kth platform energy storage PCS gain merit output regulation desired value, it is stipulated that discharge for just；
Pbat_climitK () represents the charge power limit value of kth platform energy storage PCS, this value is negative；α represents charging coefficient when SOC is on the low side, 0
<α≤1；Pbat_dlimitK () represents the discharge power limit value of kth platform energy storage PCS, this value is just；λ represents electric discharge when SOC is higher
Coefficient, 0 < λ≤1；SOCminK () represents the SOC lower limit of kth platform the controlled battery of energy storage PCS；SOCmaxK () represents kth platform energy storage
The SOC higher limit of the controlled battery of PCS.
It addition, when energy storage PCS power adjusts, first power control instruction is issued, controls it the most again and carry out pattern
Switching.And for reducing the handoff procedure impact to system, the most gradually (Practical Project leads to according to certain time delay by platform
Often for 30s～1min) carry out power instruction and issue and the switching of PCS pattern.
Fig. 3 is China's island microgrid primary connection circuit schematic diagram, and micro-grid system is typical 10kV ring network framework,
Time properly functioning, the wire-outgoing breaker of downside in many disconnections diesel generating set station, uses open loop operation.Micro-capacitance sensor is connected to diesel oil
Electric station, this electric station has 3 1.25MVA diesel-driven generators, and therefore the rotary power source in this micro-capacitance sensor is this 3 diesel oil
Electromotor；System opposite side is connected to 10kV switchyard, and the energy-storage system of 4 set 1.2MWh accesses switchyard through 400V ac bus,
Often PCS (i.e. AC/DC bi-directional inverter in the accompanying drawing) rated power in set energy-storage system is 500kW, and Simultaneous Switching station is connected to 3
The stall-controlled wind turbines of 750kW；Looped network has 4 ring main units, in order to power for load on island.
This island microgrid mainly runs on off-network pattern, and the switching of off-network main power source flexibility specifically includes that dump energy sent out by bavin
Main power source flexibility switches, and energy storage turns bavin and sends out the switching of main power source flexibility.Soft for two kinds of main power sources below in conjunction with this island microgrid
The specific implementation process of property handoff technique scheme illustrates.
1) switching of dump energy main power source flexibility sent out by bavin
(1) dump energy main power source flexibility switching entry condition sent out by bavin
Consider that bavin sends out performance driving economy and energy-storage battery capacity-constrained, simultaneously for triggering flexibility switching, relevant definite value is increased
Greatly, in example entry condition be set to only 1 bavin shipping row and meritorious exert oneself less than 600kW, energy-storage battery SOC [60%,
85%] in the range of, the real-time permeability of current blower fan is more than 50%, and current blower fan exports ripple in the range of 600～650kW of gaining merit
Dynamic.Entry condition triggers bavin and sends out the switching startup of dump energy main power source flexibility after meeting.
(2) the progressive transfer of load controls
When main power source operation sent out by bavin, energy storage PCS runs on PQ pattern.For reducing when shutdown sent out by bavin system frequency and voltage
Impact, P is setdg_limitBeing also configured as 120kW for 150kW, energy storage PCS regulation step-length, control interval set of time is 10s.
As shown in Figure 4 (abscissa is the time, unit min), 4 set energy storage are gained merit by based on energy storage PCS PQ pattern the most respectively
Regulation, altogether regulation 4 times, and the active power that bavin is sent out declines 4 times the most therewith, system voltage can be caused one during each power adjustments
Standing wave moves, but is held in zone of reasonableness, thus avoids and cause system great fluctuation process to even result in system by single regulation
The situation of unstability occurs.Make bavin send out after decline meritorious less than 150kW, meet the adjustment of energy storage PCS operational mode and shutdown sent out by bavin
Condition.
(3) energy storage PCS operational mode adjusts
As shown in Figure 4,4 set energy storage PCS are the most gradually transferred to sagging operational mode by platform by PQ, in PCS patten transformation work
System voltage is not impacted by journey, makes system seamlessly transit.
(4) shutdown control sent out by bavin
As shown in Figure 4, after energy storage PCS all transfers sagging operational mode to, then postpone short period control bavin and send out shutdown.
To system voltage substantially without impacting when shutdown sent out by bavin, it is the sagging target voltage of energy storage PCS and bavin shipping that produced voltage raises
Target voltage during row exists what certain deviation caused, and when follow-up energy storage main power source runs, voltage is then basically stable at 10.38kV
Left and right.
Complete micro-capacitance sensor by above-mentioned steps (1)～(4) and sent out the main power source flexible switching to energy storage main power source by bavin, keep away
Exempt from the system unstability risk in handoff procedure, reduced system shock, it is achieved that smooth and seamless has switched.
2) energy storage turn bavin send out main power source flexibility switching
(1) dump energy main power source flexibility switching entry condition sent out by bavin
Considering energy-storage battery charge-discharge electric power and capacity-constrained, simultaneously for triggering flexibility switching, entry condition is set to storage
70% can be less than by battery SOC, or energy-storage battery discharge power is more than 60% (every PCS nominal discharge of nominal discharge power
Power is 300kW, and 4 amount to 1.2MW).As it is shown in figure 5,4 set energy storage PCS are always meritorious is about 520kW, battery SOC is 69%,
Less than setting value, trigger flexibility switching and start.
(2) rotary power source starts and inverse probability controls
Rated power P sent out by separate unit bavindg_nomBeing set to 0.6 for 1MW, β, energy storage PCS always gains merit PbatCurrency is 500kW.
Therefore the number calculation formula that should start according to rotary power source draws and should start 1 Tai Chaifa.
In micro-capacitance sensor, 3 Tai Chaifa parameters are consistent, start bavin when sending out, and select to start the longest bavin downtime and send out.Such as Fig. 5 institute
Showing, bavin occurs in that inverse probability phenomenon in short-term after sending out simultaneous interconnecting, and inverse probability maximum is about 25kW, for eliminating inverse probability by adjusting
Joint energy storage PCS power realizes.Amount of bias Δ P is setdevFor 150kW, then select the maximum PCS of energy storage discharge power and reduce about
120kW, and control its by the sagging PQ operational mode that transfers to, thus eliminate bavin and send out inverse probability.
(3) energy storage PCS mode adjustment and power adjustments
Bavin send out startup grid-connected after, control other energy storage PCS by the sagging PQ of transferring to operational mode and regulate energy storage PCS power with
Eliminate bavin and send out the inverse probability phenomenon starting grid-connected rear appearance.After eliminating inverse probability phenomenon, enter based on energy-storage battery difference SOC interval
Row power adjusts.3 regions divided as shown in Figure 2, arrange the SOC of everyminAnd SOCmaxRespectively 65% and 80%, therefore
The target of every energy storage PCS is meritorious is all 0kW.Then power control instruction is issued to every energy storage PCS, therefore such as Fig. 5 institute
Show, then responded to meritorious regulating command for eliminating the energy storage PCS (having transferred PQ pattern to) of inverse probability.Again according to delay
The mode of 10s gradually controls other 3 energy storage PCS by platform and adjusts operational mode (transferring PQ pattern to) and active power.
Complete micro-capacitance sensor by above-mentioned steps (1)～(3) and sent out the flexible switching of main power source by energy storage main power source to bavin, keep away
Exempt from bavin and sent out inverse probability operation risk long-time, reduced system shock, it is achieved that smooth and seamless has switched.
In sum, the present invention is controlled based on the progressive transfer of load when off-network rotary power source dump energy main power source flexibility switches
System, substantially reduces the impact to system in handoff procedure.Off-network energy storage turn rotary power source main power source flexibility switching time based on
Rotary power source inverse probability and energy storage power adjustments, effectively protect rotary power source, it is achieved that the Intelligent adjustment of energy storage PCS power.
Meanwhile, have employed gradually by the progressive Controlling principle of platform, reduce the impact to system in handoff procedure to greatest extent, can be extensive
It is applied to main power source smooth and seamless switching when large-scale micro-capacitance sensor (such as MW level micro-capacitance sensor) off-network is run, switched strengthening system
Flexibility in journey and flatness.
Claims (9)
1. main power source flexible switching method under a micro-capacitance sensor off-network pattern, it is characterised in that including:
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, the control mode using the progressive transfer of load will rotation
Turn the load that power supply undertakes and be gradually transferred to energy storage, regulate energy storage PCS operational mode, control rotary power source and shut down；
The method that energy storage main power source operational mode switches to rotary power source main power source operational mode:
When meeting the switching entry condition that energy storage turns rotary power source main power source, start rotary power source, same to offset rotary power source
The inverse probability occurred after phase is grid-connected is the power of target regulation part energy storage PCS, after inverse probability phenomenon eliminates, regulates each energy storage
PCS operational mode and meritorious output are with the progressive transfer realizing load.
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern, it is characterised in that in rotation
Turn during power supply main power source operational mode switches to energy storage main power source operational mode, use the control mode of the progressive transfer of load
The load undertaken by rotary power source is gradually transferred to energy storage, method particularly includes: with every rotary power source stop moment to micro-capacitance sensor
The disturbance that voltage and frequency produce be target in the range of tolerance, gradually regulates the meritorious output of energy storage PCS until each
Energy storage PCS output is meritorious reaches to calculate desired value, and each the meritorious desired value that calculates of energy storage PCS output comprises himself meritorious output
Part and the load that undertakes according to himself rated power accounting are gained merit transfer amount part, wherein,
Meritorious calculating desired value P of kth platform energy storage PCSbat_goal(k) be: Pbat(k) represent kth platform energy storage PCS in rotary power source main power source operational mode to the main electricity of energy storage
Meritorious output before the operational mode switching of source, 1≤k≤N, N are the number of units of energy storage PCS, and Δ P represents that rotary power source main power source runs
Pattern load in energy storage main power source operational mode handoff procedure meritorious transfer total amount, Pbat_cap(k)、Pbat_cap(i) table respectively
Show kth platform, the rated power of i-th energy storage PCS, PdgRepresent that rotary power source main power source operational mode runs mould to energy storage main power source
The total meritorious output of rotary power source, P before formula switchingdg_limitJ () represents that rotary power source main power source operational mode is to energy storage main power source
The meritorious output limit value that during operational mode switching, jth platform rotary power source allows before shutting down, 1≤j≤M, M are the platform of rotary power source
Number.
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern, it is characterised in that gradually
The meritorious output of regulation energy storage PCS until each energy storage PCS output meritorious reach to calculate desired value method be: according between the time
Every gradually regulating the meritorious output of each energy storage PCS by platform until every meritorious reaching of energy storage PCS output calculates with regulation step-length
Desired value, regulation step-length fixed value adjusting follows what micro-capacitance sensor voltage and frequency were produced by the change regulation meritorious change that causes of step-length
Disturbance is in the range of tolerance.
4., according to main power source flexible switching method under micro-capacitance sensor off-network pattern a kind of described in claim 1 or 2 or 3, its feature exists
In, described rotary power source main power source operational mode switches in energy storage main power source operational mode method, and regulation energy storage PCS runs mould
Formula method particularly includes: gradually control to run on the energy storage PCS of PQ pattern by platform and transfer sagging or VSG operational mode to.
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern, it is characterised in that energy storage
When main power source operational mode turns the switching startup of rotary power source main power source operational mode, first according to the real-time traffic information of micro-capacitance sensor
Rotary power source quantity N that calculating should startdg, the most gradually start rotary power source by platform,Wherein, Pbat
Represent that energy storage PCS is at energy storage main power source operational mode always gaining merit before rotary power source main power source operational mode switches, Pdg_nomTable
Show the rated capacity of separate unit rotary power source, when in micro-grid system, multiple stage rotary power source rated power is inconsistent, Pdg_nomIt is equal to
Minima in each rotary power source rated power, β is coefficient, 0≤β≤1, symbolExpression rounds up.
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern, it is characterised in that by
Secondary start during rotary power source by platform, with the inverse probability that occurs after offsetting rotary power source simultaneous interconnecting for target gradually by platform
The power of regulation energy storage PCS, method particularly includes:
Regulate l platform energy storage PCS and transferred to PQ pattern by sagging or VSG pattern, occur according to after current rotary power source simultaneous interconnecting
Inverse probability regulate the meritorious output of l platform energy storage PCS, the target regulation power P of l platform energy storage PCSbat_adjust(l) be:
Pbat_adjust(l)=Pbat(l)-(Preverse+ΔPdev), the target at l platform energy storage PCS regulates power and reaches charge power limit
During value, regulate l platform energy storage PCS and absorb inverse probability by its charge power limit value,
Control l+1 platform energy storage PCS and transferred to PQ pattern by sagging or VGS pattern, and regulate the meritorious defeated of l+1 platform energy storage PCS
Go out, the target regulation power P of l+1 platform energy storage PCSbat_adjust(l+1) it is: Pbat_adjust(l+1)=Pbat(l+1)-(Preverse
+ΔPdev)+Pbat(l)+Pbat_climitL (), on the premise of meeting each energy storage PCS charge power limit value constraint, gradually by platform
Regulate the meritorious output of energy storage PCS until inverse probability phenomenon eliminates,
Wherein, Pbat(l)、Pbat(l+1) l platform, the current active power of l+1 platform energy storage PCS, P are represented respectivelybat_adjust(l)
≥-Pbat_climit(l), Pbat_climitL () represents the charge power limit value that l platform energy storage PCS allows, PreverseRepresent electric rotating
The inverse probability occurred after the simultaneous interconnecting of source, Δ PdevThe amount of bias being expressed as guaranteeing to eliminate inverse probability phenomenon and increase, l is for being less than
The positive integer of energy storage PCS number of units.
7. according to main power source flexible switching method under micro-capacitance sensor off-network pattern a kind of described in claim 1 or 6, it is characterised in that
Energy storage main power source operational mode switches in the method for rotary power source main power source operational mode, after inverse probability phenomenon eliminates, adjusts
Save each energy storage PCS operational mode with meritorious output to realize the progressive transfer of load, method particularly includes:
First, gradually control to run on sagging or VSG pattern energy storage PCS by platform and transfer PQ pattern to, adjusting each energy storage PCS
Keep the power before and after conversion constant during operational mode；
Then, gradually regulate the meritorious output of each energy storage PCS by step-length by platform further according to energy-storage battery carrying capacity, until each storage
The meritorious output of PCS can meet regulation desired value, kth platform energy storage PCS gains merit regulation desired value P of outputbat_target(k) be:Pbat_climitK () represents filling of kth platform energy storage PCS
Electrical power limit value, α represents that carrying capacity SOC (k) of kth platform the controlled battery of energy storage PCS is less than himself carrying capacity lower limit SOCmin
Charging coefficient time (k), 0 < α≤1, Pbat_dlimitK () represents the discharge power limit value of kth platform energy storage PCS, λ represents that kth platform stores up
Carrying capacity SOC (k) of energy the controlled battery of PCS is more than himself carrying capacity higher limit SOCmaxDischarge coefficient time (k), 0 < λ≤1.
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern, it is characterised in that described
The switching entry condition of rotary power source dump energy main power source is exerted oneself lower limit, energy-storage battery capacity and distributed according to rotary power source
The real-time permeability of power supply determines.
Main power source flexible switching method under a kind of micro-capacitance sensor off-network pattern, it is characterised in that described
Energy storage turns the switching entry condition of rotary power source main power source and determines according to energy-storage battery carrying capacity and charge-discharge electric power.
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