CN106505616A - A kind of control method of DC distribution net DC voltage - Google Patents
A kind of control method of DC distribution net DC voltage Download PDFInfo
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- CN106505616A CN106505616A CN201611018685.8A CN201611018685A CN106505616A CN 106505616 A CN106505616 A CN 106505616A CN 201611018685 A CN201611018685 A CN 201611018685A CN 106505616 A CN106505616 A CN 106505616A
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- 238000009826 distribution Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000006855 networking Effects 0.000 claims abstract description 45
- 238000007723 die pressing method Methods 0.000 claims abstract description 16
- 238000004146 energy storage Methods 0.000 claims abstract description 14
- 238000010248 power generation Methods 0.000 claims description 32
- 230000005611 electricity Effects 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 230000000284 resting effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 abstract description 3
- 241000196324 Embryophyta Species 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
A kind of control method of DC distribution net DC voltage, methods described is for the DC distribution net comprising multiple distributed power sources and energy storage device, the degree of DC bus-bar voltage offrating is divided into lightly departure, moderate deviates and severe deviates Three Estate, homophony die pressing type is respectively adopted under Three Estate, standby pressure regulation pattern and urgent pressure regulation pattern are adjusted to DC bus-bar voltage, homophony die pressing type and standby pressure regulation pattern are respectively networking inverter and energy storage device is pressed droop characteristic and adjusts DC bus-bar voltage, urgent pressure regulation pattern adjusts DC bus-bar voltage by making distributed power source downrating and load off-load.The present invention controls the DC bus-bar voltage of DC distribution net according to the size of DC voltage deviation using different pressure regulation patterns, can take over seamlessly between various pressure regulation patterns, the dispersion self-discipline for achieving DC voltage is controlled and ensure that stablizing for DC voltage, ensures that safe and stable operation of the DC distribution net under various working.
Description
Technical field
The present invention relates to a kind of method for adjusting DC distribution net DC voltage, can maintain direct current under various operating modes
The stable operation of power distribution network, belongs to technical field of electric power.
Background technology
Currently, because conventional energy resource is increasingly in short supply, environmental problem is serious all the more, based on the regenerative resources such as wind energy, luminous energy
Distributed new generation mode obtained the extensive attention and application of people.In terms of distributed new access, tradition
Alternating-current system there is certain inferior position, and direct-flow distribution system can alleviate the lance between bulk power grid and distributed power source
Shield, and can fully realize the benefit of distributed power source.Compared to traditional AC distribution net, DC distribution net can save substantial amounts of
DC/AC links, simple structure and in hgher efficiency.Additionally, DC distribution net also has, and transmission capacity is big, line cost is low, electric energy
The advantages such as quality height, controllability and reliability height, therefore become the trend of following power distribution network development.
Different from AC system, straight-flow system does not have frequency and idle, DC voltage to become measurement DC network internal power
The sole indicator of balance.Networking inverter generally with relatively high power capacity is chosen as the pressure regulation unit of DC distribution net, bears
Duty controls stablizing for DC bus-bar voltage.But cause the exchange power limited of networking inverter when exchange major network breaks down
When, DC network internal power is uneven, and distribution system will be collapsed because DC bus-bar voltage is persistently raised and lowered.Existing
DC distribution net is typically all using the single control strategy for being only applicable to Part load, goes out in major network failure, distributed power source
Under the operating mode such as fluctuation and load disturbance, it is impossible to ensure the stable operation of DC distribution net, therefore further explore ripe and
The control strategy of highly versatile is very necessary.
Content of the invention
Present invention aims to the drawback of prior art, there is provided a kind of regulation side of DC distribution net DC voltage
Method, to guarantee the stable operation under various operating modes of DC distribution net.
Problem of the present invention is solved with following technical proposals：
A kind of control method of DC distribution net DC voltage, methods described is for comprising wind power generation plant, photovoltaic
Electric installation in interior multiple distributed power sources and the DC distribution net of energy storage device, by the journey of DC bus-bar voltage offrating
Degree be divided into lightly departure, moderate deviate and severe deviate Three Estate, be respectively adopted under Three Estate homophony die pressing type, after
Standby pressure regulation pattern and urgent pressure regulation pattern are adjusted to DC bus-bar voltage, and homophony die pressing type and standby pressure regulation pattern are respectively
Networking inverter and energy storage device are pressed droop characteristic and adjust DC bus-bar voltage, and urgent pressure regulation pattern is dropped by making distributed power source
Power operation and load off-load are adjusting DC bus-bar voltage.
The control method of above-mentioned DC distribution net DC voltage, adopts during its rated value of DC bus-bar voltage lightly departure
Homophony die pressing type is：Networking inverter is pressed droop characteristic and adjusts DC bus-bar voltage, and droop characteristic is：
In formula：Udc_GridFor inverter DC network side voltage of networking, PGridFor inverter output of networking, U* dc_Grid、kgRepresent intercept and the slope of networking inverter droop characteristic respectively, now energy storage device in resting state or
Discharge and recharge is carried out with a certain firm power, wind power generation plant and photovoltaic power generation apparatus carry out maximal power tracing (maximum
Power point tracking, MPPT), Control of decreasing load is not carried out to load.
The control method of above-mentioned DC distribution net DC voltage, DC bus-bar voltage moderate deviate and adopt during its rated value
Standby pressure regulation pattern is：Energy storage device is pressed droop characteristic and adjusts DC bus-bar voltage, and droop characteristic is
In formula, Udc_BESFor accumulator DC network side voltage, PBESFor accumulator cell charging and discharging power, U* dc_BES、kbDifference table
Show intercept and the slope of accumulator droop characteristic, now wind power generation plant and photovoltaic power generation apparatus in peak power with
Track (MPPT) state, does not carry out Control of decreasing load to load.
The control method of above-mentioned DC distribution net DC voltage, DC bus-bar voltage severe deviate and adopt during its rated value
Promptly pressure regulation pattern is：Wind power generation plant downrating, the part photovoltaic battery panel or right cut off in photovoltaic power generation apparatus
Load carries out Control of decreasing load.
The control method of above-mentioned DC distribution net DC voltage, when carrying out off-load operation to load, importance rate is low
Load is preferentially removed.
The control method of above-mentioned DC distribution net DC voltage, the grade classification of DC bus-bar voltage offrating degree
Method is：The corresponding voltage deviation of lightly departure is between ± 0.02pu (perunit value)；Moderate deviates corresponding voltage deviation
Between 0.02pu and 0.05pu or -0.02pu and -0.05pu；Severe deviate corresponding voltage deviation between 0.05pu with
Between 0.1pu or -0.05pu and -0.1pu.
The control method of above-mentioned DC distribution net DC voltage, when DC bus-bar voltage deviation is between 0.05pu and UWT_PV-
(U when between 1puWT_PVFor blower fan, the voltage threshold between power and photovoltaic battery panel excision drops), blower fan downrating, its drop
Power curve is：
In formula, Udc_WTFor blower fan DC network side voltage, Δ PWTSubtract the power that sends out, U for blower fan* dc_WT、kwtRepresent respectively
The intercept of blower fan drop power curve and slope；When DC bus-bar voltage deviation is between UWT_PVWhen between -1pu and 0.1pu, cut one by one
Except the cut off cell panel in photovoltaic power generation apparatus；When DC bus-bar voltage deviation is between -0.05pu and -0.1pu, right
Load carries out off-load operation.
The present invention is controlled containing multiple distributed power sources using different pressure regulation patterns according to the size of DC voltage deviation
DC distribution net DC bus-bar voltage, can take over seamlessly between various pressure regulation patterns, it is achieved that the dispersion of DC voltage
Self-discipline is controlled and ensure that stablizing for DC voltage, ensures that safety and stability fortune of the DC distribution net under various working
OK.
Description of the drawings
Fig. 1 is the structure chart of the ring-type DC distribution net containing multiple distributed power sources；
Fig. 2 is " DC voltage-active power " droop characteristic of networking inverter；
" DC voltage-active power " droop characteristics of Fig. 3 for energy storage battery；
Fig. 4 is the characteristic curve that power, photovoltaic battery panel excision and the urgent adjusting pressure measure of three kinds of load off-load drop in blower fan；
Fig. 5 is the power limited that networking inverter is absorbed from DC network, and DC distribution net is under traditional control algorithm
Operation result；
Fig. 6 is the power limited that networking inverter is injected to DC network, and DC distribution net is under traditional control algorithm
Operation result；
Fig. 7 is the power limited that networking inverter is absorbed from DC network, and DC distribution net is under the present invention by blower fan
Drop power, photovoltaic battery panel cut off to adjust the operation result of DC bus-bar voltage；
Fig. 8 is the power limited that networking inverter is injected to DC network, and DC distribution net is using the present invention by load
Off-load is adjusting the operation result of DC bus-bar voltage.
In figure with each symbol in text it is：PGridFor inverter output of networking, PL_acFor AC load power, PL_dcFor
DC load power, PPVFor photovoltaic generation power, PWTFor wind turbine power generation power, PBESFor accumulator cell charging and discharging power, PMSG is
Magneto alternator group, G-VSC are exchange major network side voltage source converter (referred to as networking inverter), and L-VSC is exchange
Load side voltage source converter, L-DC are that DC load side boosting or buck chopper inverter, PV-DC are cut for photovoltaic side boosting
Ripple inverter, W-VSC be blower fan side voltage source converter, B-DC be the two-way copped wave inverter in accumulator side, PLoadStraight for handing over
Stream load power sum, Udc_GridFor inverter DC network side voltage of networking, U* dc_GridBent for inverter droop characteristic of networking
The intercept of line, kgFor the slope of inverter droop characteristic of networking, PGrid_minFor network inverter output minima,
PGrid_maxFor the maximum of inverter output of networking, Udc_BESFor accumulator DC network side voltage, U* dc_BESFor accumulator
The intercept of droop characteristic, kbFor the slope of accumulator droop characteristic, PBES_minFor B-DC inverters output most
Little value, PBES_maxFor the maximum of B-DC inverter outputs, UWT_PVDrop between power and photovoltaic battery panel excision for blower fan
Voltage threshold, Udc_WTFor blower fan DC network side voltage, Δ PWTSubtract the power that sends out, U for blower fan* dc_WTBent for blower fan drop power
The intercept of line, kwtFor the slope that power curve drops in blower fan, Δ PWT_maxThe peak power that sends out, PV can be subtracted for blower fan1、PV2、…、PVm
For the resectable photovoltaic battery panel of m groups, UPV_1、UPV_2、…、UPV_mIt is the voltage corresponding with the resectable photovoltaic battery panel of m groups
Threshold value, Udc_PVFor photovoltaic DC network side voltage, Δ PPVFor the photovoltaic power for cutting off, Δ PPV_maxFor maximum resectable photovoltaic
Power, L1、L2、…、LnFor n group loads (including AC load and DC load), ULoad_1、ULoad_2、…、ULoad_nIt is and n groups
The corresponding voltage threshold of load, Udc_acLFor AC load DC network side voltage, Udc_dcLFor DC load DC network side
Voltage, Udc_LoadIt is load DC network side voltage (including Udc_acLAnd Udc_dcL), Δ PLoadFor the load power for cutting off, Δ
PLoad_maxFor at most resectable load power.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Ring-type DC distribution net containing multiple distributed power sources of the present invention is as shown in figure 1, mainly include wind-power electricity generation
Device (is magneto alternator group (the permanent magnet synchronous driven by blower fan in Fig. 1
Generator, PMSG)), photovoltaic power generation apparatus, energy storage device (accumulator in Fig. 1), AC load, DC load and connection
Net inverter is constituted, PWT、PPV、PBES、PL_ac、PL_dc、PGridWind turbine power generation power, photovoltaic generation power, accumulator are represented respectively
Charge-discharge electric power, AC load power, DC load power and networking inverter output.G-VSC is exchange major network side electricity
Potential source type inverter (referred to as networking inverter), W-VSC is blower fan side voltage source converter, and PV-DC is cut for photovoltaic side boosting
Ripple inverter, B-DC are the two-way copped wave inverter in accumulator side, and L-VSC is AC load side voltage source converter, and L-DC is
DC load side boosting or buck chopper inverter.In order to obtain higher power benefit, blower fan and photovoltaic power generation apparatus are general
Maximal power tracing (maximum power point tracking, MPPT) state is operated in, can also in particular cases be dropped
Power operation.Under normal and net state, the power-balance node that major network is distribution system is exchanged.
DC voltage regulation method of the present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Under homophony die pressing type, the size of DC voltage deviation between ± 0.02pu (perunit value), network inverter
Press droop characteristic and adjust DC voltage, accumulator carries out discharge and recharge (in Fig. 3 in resting state or with a certain firm power
Shown in dash area), blower fan and photovoltaic power generation apparatus carry out maximal power tracing, do not carry out Control of decreasing load to load.Exchange master
Net is the power-balance node of system, and its power for injecting DC network is
PGrid=PL_ac+PL_dc-PBES-PWT-PPV
=PLoad-PBES-PWT-PPV
In formula：PGrid、PBESTo flow to DC network as just；PLoadRepresent alternating current-direct current load power sum.
As shown in Fig. 2 " DC voltage-active power " droop characteristic of homophony die pressing type second line of a couplet net inverter can table
It is shown as
In formula：Udc_GridFor inverter DC network side voltage of networking, PGridFor inverter output of networking, U* dc_Grid、kgIntercept and the slope of networking inverter droop characteristic are represented respectively, here U* dc_GridTake 1pu, kgTake
0.02pu.In Fig. 2, PGrid_minFor the minima of inverter output of networking, PGrid_maxFor inverter output of networking
Maximum.When DC voltage deviation is more than 0.02pu or is less than -0.02pu, the output of inverter of networking reaches and is most worth
PGrid_minOr PGrid_max, it is a certain that dash area represents that exchange major network failure causes the output of networking inverter to be limited in
Value.
Under standby pressure regulation pattern, the size of DC voltage deviation between 0.02pu and 0.05pu or -0.02pu with -
Between 0.05pu, now grid-connected chopper disconnects or networking converter power is limited, and accumulator is pressed droop characteristic and adjusts unidirectional current
Pressure, blower fan, photovoltaic power generation apparatus do not carry out Control of decreasing load to load in maximal power tracing state.Networking converter power
Limited include that two kinds of situations, one reach for networking inverter output and are most worth, which two causes to network for exchanging major network failure
Inverter output is limited, as shown in the dash area in Fig. 2.Under standby pressure regulation pattern, accumulator is the power of system
Balance nodes, its inject DC network power be
PBES=PLoad-PGrid-PWT-PPV
As shown in figure 3, PBESFor accumulator cell charging and discharging power, PBES_minFor the minima of B-DC inverter outputs,
PBES_maxMaximum for B-DC inverter outputs.Under standby pressure regulation pattern, the size of DC voltage deviation between
Between 0.02pu and 0.05pu or -0.02pu and -0.05pu, accumulator is pressed droop characteristic and adjusts DC voltage, accumulator " straight
Stream voltage-active power " droop characteristic is represented by
In formula, Udc_BESFor accumulator DC network side voltage, U* dc_BES、kbAccumulator droop characteristic is represented respectively
Intercept and slope, here U* dc_BESTake 1.02pu or 0.98pu, kbTake 0.03pu.
When the size of DC voltage deviation is between ± 0.02pu, the dash area in Fig. 3 represents that accumulator is in
Resting state carries out discharge and recharge with a certain firm power.When DC voltage deviation is more than 0.05 or is less than -0.05, accumulator
Output reach most value PBES_minOr PBES_max.
Under urgent pressure regulation pattern, the size of DC voltage deviation is between 0.05pu and 0.1pu or -0.05pu and -0.1pu
Between, now grid-connected chopper disconnects or networking converter power is limited, and the output of accumulator reaches and is most worth.For avoiding matching somebody with somebody
Electric system is collapsed because DC voltage is persistently raised and lowered, and makes blower fan downrating, the portion cut off in photovoltaic power generation apparatus
Divide photovoltaic battery panel or Control of decreasing load is carried out to load.
Fig. 4 is blower fan of the present invention drop power, photovoltaic battery panel excision and the urgent adjusting pressure measure of three kinds of load off-load
Characteristic curve.
Referring to Fig. 4 (a), Udc_WTFor blower fan DC network side voltage, Δ PWTSubtract the power that sends out, Δ P for blower fanWT_maxFor wind
Machine can subtract the peak power that sends out, UWT_PVFor blower fan, the voltage threshold between power and photovoltaic battery panel excision drops.Work as DC voltage
Deviation is between 0.05pu and UWT_PVWhen between -1pu, blower fan downrating, its drop power curve and are represented by
In formula, U* dc_WT、kwtIntercept and the slope of blower fan drop power curve are represented respectively, here U* dc_WTTake 1.05pu, kwt
Take (UWT_PV-1.05)/ΔPWT_max.When DC voltage deviation is between UWT_PVWhen between -1pu and 0.1pu, blower fan subtracts the power that sends out
Reach maximum Δ PWT_max.When DC voltage deviation is less than 0.05pu, blower fan is in MPPT states.
Referring to Fig. 4 (b), Udc_PVFor photovoltaic power generation apparatus DC network side voltage, Δ PPVFor the photovoltaic power generation apparatus for cutting off
Power, Δ PPV_maxFor maximum resectable photovoltaic power generation apparatus power.When DC voltage deviation is between UWT_PV- 1pu and 0.1pu
Between when, for avoiding DC voltage from persistently raising, need to carry out excision operation to photovoltaic battery panel.Assume resectable photovoltaic electric
Pond plate has m groups, i.e. PV1、PV2、…、PVm, corresponding voltage threshold is UPV_1、UPV_2、…、UPV_m, and meet
UWT_PV＜ UPV_1＜ UPV_2＜ ... ＜ UPV_m≤1.1pu
According to Udc_PVThis m Battery pack plate is cut off, works as Udc_PVReach UPV_1When, cut off PV1, Udc_PVReach UPV_2
When, cut off PV2, by that analogy, work as Udc_PVReach UPV_mWhen, cut off PVm.When DC voltage deviation is less than UWT_PVDuring -1pu, light
Volt TRT is in MPPT states.
Referring to Fig. 4 (c), Udc_LoadIt is load DC network side voltage (including AC load DC network side voltage Udc_acL
With DC load DC network side voltage Udc_dcL), Δ PLoadFor the load power for cutting off, Δ PLoad_maxFor at most resectable
Load power.When DC voltage deviation is between -0.05pu and -0.1pu, for avoiding DC voltage from continuing to reduce, need
Off-load operation is carried out to load.Assume load L1、L2、…、LnThe importance rate of (including AC load and DC load) is successively
Raise, corresponding voltage threshold is respectively ULoad_1、ULoad_2、…、ULoad_n, the low load of importance rate is preferentially removed, on
State voltage threshold satisfaction
0.95pu>ULoad_1＞ ULoad_2＞ ... ＞ ULoad_n≥0.9pu
According to Udc_LoadLoad is cut off, works as Udc_LoadDrop to ULoad_1When, cut off L1, Udc_LoadDrop to ULoad_2When,
Cut off L2, by that analogy, work as Udc_LoadDrop to ULoad_nWhen, cut off Ln.When DC voltage deviation is more than -0.05pu, not to negative
Lotus carries out off-load operation.
For avoiding the switching repeatedly of photovoltaic battery panel and load, when DC voltage falls after rise or gos up, cell panel and load
Do not automatically engage, but put into according to system situation manually when pressure regulation pattern returns to main pressure regulator or standby pressure regulation.
As shown in Figure 1 six end ring shape DC distribution network simulation platforms are built in an embodiment, and the platform is specified comprising 1
Permanent magnetism Wind turbines of the power for 20kW, rated wind speed is 12m/s；Photovoltaic power generation apparatus are the electricity of 5kW by 4 groups of rated power
Pond plate composition, specified irradiance is 1000W/m2, wherein photovoltaic battery panel PV1、PV2Can cut off；The rated capacity of accumulator is
The rated capacity of 400A h, B-DC is 10kW；Load L1、L2、L3、L4Importance rate raise successively, capacity is 10kW,
Wherein L1、L2For DC load, L3、L4For AC load；The rated capacity of networking inverter is 30kW；The specified electricity of dc bus
Press as 500V.In following operation result, PGrid、PBESTo inject DC network as just.
Fig. 5 and Fig. 6 is the operation result of DC distribution net under traditional control algorithm, and now there is the connection of relatively high power capacity
Net converter Control DC voltage is stablized.
Referring to Fig. 5, when emulation starts, wind speed is 9m/s, and irradiance is 1000W/m2, blower fan and photovoltaic power generation apparatus are located
In MPPT states, output respectively may be about 10kW and 20kW；Accumulator is in resting state, and output is 0；L3、L4Access
Power distribution network, load power are about 20kW；G-VSC is by Udc_GridControl is about in 1pu, the power absorbed from DC network
10kW.During 1s, exchange major network failure causes G-VSC to be limited in 5kW from the power that DC network absorbs, work(in distribution system
Rate is superfluous, Udc_GridPersistently rise, system is eventually collapsed because of the super higher limit of DC voltage.
Referring to Fig. 6, when emulation starts, the original state of blower fan, photovoltaic power generation apparatus and accumulator is identical with Fig. 5；L1、
L2、L3、L4Power distribution network is accessed, load power is about 40kW；G-VSC is by Udc_GridControl in 1pu, to the work(of DC network injection
Rate is about 10kW.During 1s, exchange major network failure causes G-VSC to be limited in 5kW, power distribution system to the power that DC network injects
Underpower in system, Udc_GridContinuous decrease, system is eventually because DC voltage is collapsed less than lower limit.
Apply the present invention to the six end ring shape DC distribution network simulation platform, make UWT_PV=1.08pu, Δ PWT_max=
0.3pu, UPV_1=1.09pu, UPV_2=1.1pu, ULoad_1=0.94pu, ULoad_2=0.93pu, ULoad_3=0.92pu, ULoad_4
=0.91pu.Using DC distribution net during the present invention operation result as shown in Figure 7 and Figure 8.
Referring to Fig. 7, the original state of blower fan, photovoltaic power generation apparatus, accumulator and load is identical with Fig. 5, and G-VSC is from straight
The power that flow network absorbs is about 10kW, and system is in homophony die pressing type, Udc_GridControlled in 1.006pu or so by G-VSC.The
During 1s, exchange major network failure causes G-VSC to be limited in 5kW from the power that DC network absorbs, and net internal power is superfluous, unidirectional current
Pressure is raised, and system enters standby pressure regulation pattern, and accumulator switchs to working condition by resting state, and it is unnecessary to absorb from DC network
5kW power, Udc_BESControlled in 1.035pu by B-DC.During 2s, L4Exit, B-DC outputs reach minima -10kW,
DC voltage is raised, and system enters urgent pressure regulation pattern, and blower fan starts to drop power, and during about 2.5s, net internal power reaches balance, wind
Machine output is about 5kW, Udc_WTControlled in 1.075pu by W-VSC.During 3s, L3Exit, blower fan subtracts the power that sends out up to most
Big value 6kW, and net internal power is superfluous, DC voltage rises, and works as Udc_PVWhen rising to 1.09pu, PV1Removed, but power is still superfluous
Cause Udc_PVContinue to rise, work as Udc_PVWhen rising to 1.1pu, PV2Removed, now net internal power is not enough, and DC voltage starts back
Fall, during about 4s, reach balance, blower fan output is about 5kW, Udc_WTControlled in 1.075pu by W-VSC.
Referring to Fig. 8, the original state of blower fan, photovoltaic power generation apparatus, accumulator and load is identical with Fig. 6, and G-VSC is to straight
The power of flow network injection is about 10kW, and system is in homophony die pressing type, and G-VSC controls DC voltage.During 1s, major network is exchanged
Failure makes G-VSC be limited in 5kW to the power that DC network injects, and net internal power is not enough, and DC voltage declines, and system is entered
Standby pressure regulation pattern, accumulator start to control DC voltage, make up the power shortage in net.During 2s, irradiance bust is extremely
500W/m2, photovoltaic power generation apparatus output is down to about 9.5kW, and B-DC outputs reach maximum 10kW, DC voltage because
Net internal power is not enough and declines, the urgent pressure regulation pattern of system entrance.Work as Udc_dcLWhen being down to 0.94pu, L1Removed, DC voltage
Go up, during about 2.3s, system reenters standby pressure regulation pattern.During 3s, irradiance anticlimax to 0, photovoltaic power generation apparatus output work
Rate is reduced to 0, and DC voltage reduces again because of underpower, and system is again introduced into urgent pressure regulation pattern, works as Udc_dcLIt is down to
During 0.93pu, L3Removed, hereafter DC voltage gos up, and system returns to standby pressure regulation pattern.
Can be seen that under traditional control algorithm from the operation result shown in Fig. 5～8, converter Control unidirectional current of networking
Pressure is stablized, but when the power limited of inverter of networking, net internal power is uneven, distribution system can because DC voltage is too high or
Too low and collapse；And fluctuation and load disturbance are gone out in major network failure, distributed power source using the DC distribution net of the present invention
Etc. under various working can stable operation, can smooth between homophony die pressing type, standby pressure regulation pattern and urgent pressure regulation pattern and cut
Change, multiple pressure regulation patterns ensure that the dispersion self-discipline control that is stable and achieving DC voltage of DC voltage, so as to demonstrate
Effectiveness of the invention.
Accompanying drawing is to the invention provides further explanation, what Fig. 1 was given is filled comprising multiple distributed power sources and energy storage
The DC distribution net system that puts, this are the bases for illustrating the present invention.
Fig. 2 gives " DC voltage-active power " droop characteristic of networking inverter of the present invention, with this
The bright homophony die pressing type adopted in DC bus-bar voltage lightly departure rated value is corresponding, and the figure is mainly to of the present invention
Homophony die pressing type is aided in illustrating.
Fig. 3 gives " DC voltage-active power " droop characteristic of energy storage battery of the present invention, with this
The bright standby pressure regulation pattern adopted in DC bus-bar voltage moderate offrating is corresponding, and the figure is mainly to of the present invention
Standby pressure regulation pattern aided in illustrating.
Fig. 4 sets forth the characteristic curve of blower fan drop power, photovoltaic battery panel excision and load off-load, with the present invention
The urgent pressure regulation pattern adopted in DC bus-bar voltage severe offrating is corresponding, and the figure is mainly to of the present invention
Urgent pressure regulation pattern is aided in illustrating.
Fig. 5 is DC distribution net using traditional control algorithm with Fig. 6 and exchanges operation result when major network breaks down,
In Fig. 5, major network failure causes the power limited that networking inverter absorbs from DC network, and networking inverter direct current out of hand is female
The ability of line voltage, DC network internal power are superfluous, and DC distribution net is eventually collapsed because of the super higher limit of DC voltage；In figure
In 6, major network failure causes the power limited that networking inverter injects, networking inverter dc bus out of hand to DC network
Voltage capability, DC network internal power are not enough, and DC distribution net is eventually collapsed because of the super lower limit of DC voltage.Fig. 5 and Fig. 6
It is mainly used in the drawbacks of traditional control algorithm is described.
Fig. 7 is DC distribution net using the present invention with Fig. 8 and exchanging major network failure causes networking inverter output to be received
Operation result in limited time, is respectively intended to compare with Fig. 5 and Fig. 6, to highlight the superiority of the present invention.Fig. 7 is to of the present invention
Blower fan drop power in homophony die pressing type, standby pressure regulation pattern and urgent pressure regulation pattern, photovoltaic panel cut off to have carried out emulating and test
Card, Fig. 8 are imitated to the load off-load in homophony die pressing type of the present invention, standby pressure regulation pattern and urgent pressure regulation pattern
True checking, i.e., Fig. 7, Fig. 8 have carried out comprehensive checking to DC voltage regulation method of the present invention, to highlight the present invention's
Feasibility, effectiveness.
Claims (7)
1. a kind of control method of DC distribution net DC voltage, is characterized in that, methods described for comprising wind power generation plant,
DC bus-bar voltage is deviateed specified by photovoltaic power generation apparatus in interior multiple distributed power sources and the DC distribution net of energy storage device
The degree of value is divided into lightly departure, moderate and deviates and severe deviation Three Estate, and main pressure regulator is respectively adopted under Three Estate
Pattern, standby pressure regulation pattern and urgent pressure regulation pattern are adjusted to DC bus-bar voltage, homophony die pressing type and standby pressure regulation mould
Formula is respectively networking inverter and energy storage device is pressed droop characteristic and adjusts DC bus-bar voltage, and urgent pressure regulation pattern is by making distribution
Formula power supply downrating and load off-load are adjusting DC bus-bar voltage.
2. a kind of control method of DC distribution net DC voltage according to claim 1, is characterized in that, dc bus electricity
During pressure its rated value of lightly departure the homophony die pressing type that adopts for：Networking inverter is pressed droop characteristic and adjusts DC bus-bar voltage,
Droop characteristic is：
In formula：Udc_GridFor inverter DC network side voltage of networking, PGridFor inverter output of networking, U* dc_Grid、kgPoint
Biao Shi not network inverter droop characteristic intercept and slope, now energy storage device is in resting state or with a certain constant
Power carries out discharge and recharge, and wind power generation plant and photovoltaic power generation apparatus carry out maximal power tracing, do not carry out off-load control to load
System.
3. a kind of control method of DC distribution net DC voltage according to claim 1 and 2, is characterized in that, direct current is female
Line voltage moderate deviate the standby pressure regulation pattern that adopts during its rated value for：Energy storage device is pressed droop characteristic and adjusts dc bus electricity
Press, droop characteristic is
In formula, Udc_BESFor accumulator DC network side voltage, PBESFor accumulator cell charging and discharging power, U* dc_BES、kbRepresent respectively and store
The intercept of battery droop characteristic and slope, now wind power generation plant and photovoltaic power generation apparatus are in maximal power tracing
(MPPT) state, does not carry out Control of decreasing load to load.
4. a kind of control method of DC distribution net DC voltage according to claim 3, is characterized in that, dc bus electricity
Ballast degree deviate the urgent pressure regulation pattern that adopts during its rated value for：Wind power generation plant downrating, excision photovoltaic generation
Part photovoltaic battery panel in device carries out Control of decreasing load to load.
5. a kind of control method of DC distribution net DC voltage according to claim 4, is characterized in that, load is carried out
When off-load is operated, the low load of importance rate is preferentially removed.
6. a kind of control method of DC distribution net DC voltage according to claim 5, is characterized in that, dc bus electricity
Pressure offrating degree rank division method be：The corresponding voltage deviation of lightly departure between ± 0.02pu (perunit value) it
Between；The corresponding voltage deviation of moderate deviation is between 0.02pu and 0.05pu or -0.02pu and -0.05pu；It is right that severe deviates
The voltage deviation that answers is between 0.05pu and 0.1pu or -0.05pu and -0.1pu.
7. a kind of control method of DC distribution net DC voltage according to claim 6, is characterized in that, work as dc bus
Voltage deviation is between 0.05pu and UWT_PV(U when between -1puWT_PVFor blower fan, the electricity between power and photovoltaic battery panel excision drops
Pressure threshold value), blower fan downrating, its drop power curve be：
In formula, Udc_WTFor blower fan DC network side voltage, Δ PWTSubtract the power that sends out, U for blower fan* dc_WT、kwtBlower fan is represented respectively
The intercept of drop power curve and slope；When DC bus-bar voltage deviation is between UWT_PVWhen between -1pu and 0.1pu, light is cut off one by one
Cut off cell panel in volt TRT；When DC bus-bar voltage deviation is between -0.05pu and -0.1pu, to load
Carry out off-load operation.
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| CN109586270A (en) * | 2018-11-28 | 2019-04-05 | 重庆大学 | Based on the adaptive droop control method of DC distribution net between voltage partition |
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| CN107104456A (en) * | 2017-05-16 | 2017-08-29 | 国家电网公司 | The direct current network voltage optimization control method of the photovoltaic generating system containing multiterminal |
| CN107317556A (en) * | 2017-08-28 | 2017-11-03 | 苏州思创源博电子科技有限公司 | A kind of intelligent control method of photo-voltaic power generation station |
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| EP3785342A4 (en) * | 2018-04-27 | 2022-05-11 | Nextracker Inc. | Dc/dc converter for distributed storage and solar systems |
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| CN109586270A (en) * | 2018-11-28 | 2019-04-05 | 重庆大学 | Based on the adaptive droop control method of DC distribution net between voltage partition |
| CN111769587A (en) * | 2019-04-01 | 2020-10-13 | 新奥数能科技有限公司 | Power grid frequency modulation control method and device with participation of photovoltaic power generation |
| CN109980628A (en) * | 2019-04-18 | 2019-07-05 | 浙江大学 | The distributing mark of multi-voltage grade DC distribution net changes power coordination control method |
| CN111224392A (en) * | 2020-01-03 | 2020-06-02 | 云南电网有限责任公司电力科学研究院 | Three-port direct current energy router power coordination control method |
| CN113394766A (en) * | 2021-07-19 | 2021-09-14 | 华北电力大学（保定） | DC power grid voltage transient control system and method based on load accumulated electric quantity |
| CN113394766B (en) * | 2021-07-19 | 2023-01-17 | 华北电力大学（保定） | DC power grid voltage transient control system and method based on load accumulated electric quantity |
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