CN105449684B - Scale electric automobile group system and its control method based on MMC - Google Patents
Scale electric automobile group system and its control method based on MMC Download PDFInfo
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- CN105449684B CN105449684B CN201510999100.4A CN201510999100A CN105449684B CN 105449684 B CN105449684 B CN 105449684B CN 201510999100 A CN201510999100 A CN 201510999100A CN 105449684 B CN105449684 B CN 105449684B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000004069 differentiation Effects 0.000 claims abstract description 7
- 208000035126 Facies Diseases 0.000 claims abstract description 6
- 230000001174 ascending effect Effects 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
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- 230000000295 complement effect Effects 0.000 claims description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 2
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- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000010354 integration Effects 0.000 abstract description 3
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- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/63—Monitoring or controlling charging stations in response to network capacity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
-
- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- H02J7/0027—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
- Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
- Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
- Y04S30/12—Remote or cooperative charging
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
- Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
- Y04S30/14—Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a kind of scale electric automobile group system and its control method based on MMC, it is characterized in that three by reactor, the facies unit that H bridge modules and submodule are formed is connected to topological structure of the AC network as the scale electric automobile group system based on MMC by LC wave filters, pass through the initial state-of-charge of each electric automobile, user sets the residence time and it is expected that state-of-charge calculates virtual state-of-charge, submodule where electric automobile corresponding to drive signal driving caused by each carrier signal is determined according to the sequence of virtual state-of-charge, realize that the electric automobile charge-discharge electric power for being connected to submodule is controlled by user's request differentiation, and realize three-phase power balance and unity power factor control in grid side.Degree of integration height of the present invention, degree of modularity height, efficiency high, harmonic distortion is small, switching loss is low, and fault-tolerant ability is strong, submodule can realize independent control in each phase bridge arm.
Description
Technical field
The present invention relates to electric automobile cluster field, applied to extensive electric automobile charging station, electric automobile to power network
The occasions such as the realization of (Vehicle-to-grid, V2G), concretely relate to a kind of scale electric automobile collection based on MMC
Group's system and its control method.
Background technology
The characteristics of because of electric automobile (Electric Vehicle, EV) no pollution, it is therefore foreseen that electric automobile will be big in following 10 years
Scale development.Electric automobile accesses power network on a large scale, and a series of negative effect, such as increase distribution will be brought to traditional power network
Formula network peak load, increase electric network swim is uncertain, increases harmonic pollution in electric power net, influences the scheduling meter of distributed power generation
Draw.Therefore how scale integrates EV for research, reduces its influence to power network to greatest extent；EV is allowed to serve as storage in following power network
Energy device, provides the assistant services such as stable frequency for bulk power grid, will also there is very big realistic meaning.
In order to make full use of assistant service effect of the cluster electric automobile to intelligent grid, at the same meet user with car need
Ask, two aspects of hardware and software need to be considered.Hardware aspect needs one are efficient, can integrate opening up for large-scale cluster electric automobile
Flutter structure；Software aspects need an EMS, realize that electric automobile rationalizes to power network discharge and recharge and manage.It is existing
The bus difference that the efficient integrated topological of electric automobile typically connects according to electric automobile is divided into three classes：Dc bus is integrated, exchange
Bus integrates and alternating current-direct current bus hybrid integrated.One of which method is that electric automobile is integrated by DC/DC converters, parallel connection
In on dc bus, this method can be beneficial to coordinate with centralized Control, but need one central AC/DC controller of increase and electricity
Net is connected, and the structure will actually pass through two stage power in electric automobile charge and discharge process and convert, and efficiency is low；Another kind side
Method is the integration mode that electric automobile is connected in parallel by AC/DC converters on ac bus, and this kind of method is easy to system expansion
Exhibition, but need to take decentralized control method, it is unfavorable for system coordination control.In summary, these topologys and control strategy
Integrated and power network the scheduling requirement of electric automobile is focused mainly on, rarely has consideration user's request.When electric automobile collects on a large scale
During synthesis, the user in group system is to meet that self-demand may reduce the assistant service ability of system, even results in " peak
The phenomenon at upper plus peak ".
The content of the invention
The present invention is to avoid the deficiency present in above-mentioned prior art, there is provided a kind of electronic vapour of scale based on MMC
Car group system and its control method, realize individual electric car charge-discharge electric power differentiation control.Control object is based on MMC
Scale electric automobile group system, when accessing the scale electric automobile group system based on MMC by gathering electric automobile
Initial state-of-charge SOC0ij, user set residence time tijWith expectation state-of-charge SOCij, according to virtual state-of-charge V-
SOCijCarrier signal corresponding to each electric automobile of sequence determination, the purpose of electric car charge-discharge electric power distribution according to need is realized, and
Ensure the balance of MMC system three-phase power outputs.
The present invention adopts the following technical scheme that to solve technical problem：
The characteristics of scale electric automobile group system of the present invention based on MMC is：Three facies units are filtered by LC respectively
Ripple device is connected to AC power network, and the facies unit is made up of upper and lower two bridge arm units, and the bridge arm unit is by a reactance
Device La, a H bridge module and n identical submodule are composed in series；The H bridge modules are to carry anti-paralleled diode by four
Full control power device SH1, SH2, SH3, SH4 and capacitor C composition, wherein control power device SH1 and full control power device entirely
SH2 colelctor electrode is connected to DC power anode, and full power device SH3 of controlling is connected with full control power device SH4 emitter stage
DC power cathode is connected to, full power device SH1 emitter stages of controlling are connected with controlling power device SH3 colelctor electrodes entirely and are connected to electric capacity
Plus end of the device C one end as H bridge modules, full power device SH2 emitter stages of controlling are connected with full control power device SH4 colelctor electrodes
And it is connected to negative terminal of the capacitor C other end as H bridge modules；The H bridge modules are connect with controlling the grid of power device entirely
By the drive signal from external equipment, break-make is realized；The submodule is by the full control power device with anti-paralleled diode
Part S1, S2 and a direct-current charging interface of electric automobile composition；Wherein, control power device S1 colelctor electrode and electric automobile are straight entirely
The positive pole of current charge interface is connected, and the full emitter stage for controlling power device S1 is connected as son with full control power device S2 colelctor electrode
The plus end of module, the full emitter stage for controlling power device S2 is connected with the negative pole of direct-current charging interface of electric automobile is used as submodule
Negative terminal, the full grid for controlling power device S1 and S2 receives the external drive signal from external equipment as submodule respectively
Drive signal, realize submodule break-make；The external drive signal of full control the power device S1 and S2 are complementary；The submodule
Working method is：
To control the full control power device S1 be conducting, full control power device S2 is shut-off, and electric automobile is by access bridge arm
Unit, realize the input of electric automobile；It is shut-off to control the full control power device S1, control power device S2 is conducting entirely, electricity
Electrical automobile is bypassed from bridge arm unit, realizes the excision of electric automobile；
By controlling the working method of each bridge arm unit Neutron module, the number of electric automobile input and excision can be controlled
Amount, realizes the control to bridge arm unit output voltage；The submodule drive signal is to distribute modulation strategy to every according to carrier wave
Individual submodule carries out SPWM modulation and obtained.
The characteristics of scale electric automobile group system of the present invention based on MMC, lies also in：The submodule drive signal
It is to distribute modulation strategy according to carrier wave as follows to carry out each submodule SPWM modulation acquisitions：
(1) the modulation wave signal v of each bridge arm unit is obtained as followsrefa
To the grid-connected current i of the AC power network of the scale electric automobile group systemabcSampled, according to
Park transformation theories, the grid-connected current i of acquisition will be sampledabcIt is transformed into under the synchronously rotating reference frame of line voltage vector oriented
Direct-axis component and quadrature axis component, the direct-axis component be watt current id, the quadrature axis component is reactive current iq；It is logical
Cross the azimuth that phase-locked loop pll obtains line voltageBy the watt current idWith reactive current iqIt is active with setting respectively
Given value of current value idrefWith reactive current set-point iqrefIt is compared, obtained difference forms converter through pi regulator respectively
Output voltage d-axis command value vdrefWith quadrature axis command value vqref, wherein, watt current set-point idrefObtained by power outer shroud,
To realize unity power factor by reactive current set-point iqrefIt is arranged to zero；The scale electric automobile collection based on MMC
Group's system carries out SPWM controls using carrier wave distribution modulation strategy, by the voltage d-axis command value vdrefWith quadrature axis command value
vqrefConverted by anti-PARK, obtain the modulation wave signal v of each bridge arm unitrefa；
(2) distribute to use in modulation strategy in the carrier wave and produce triangle carrier signal as follows：
Set each bridge arm unit in the scale electric automobile group system while be connected with n platform electric automobiles, then
The triangle carrier signal for being correspondingly arranged n stacking is followed successively by C1, C2, C3 ..., Cn, each triangle carrier signal from bottom to top layer
Peak-to-peak value be 1/n, the upper strata triangle wave spacing 1/n adjacent with lower floor, caused by each triangle carrier signal SPWM control letter
Number corresponded with each electric automobile, for controlling the charging and discharging state and charge-discharge electric power size of corresponding electric automobile.
The characteristics of control method of the scale electric automobile group system based on MMC of the invention is：According to access
The initial state-of-charge SOC of electric automobile in scale electric automobile group system based on MMC0ij, user set stop when
Between tijAnd it is expected state-of-charge SOCij, in the charge/discharge shape of the scale electric automobile group system based on MMC
Individual electric car charge/discharge difference power alienation control is realized using carrier wave distribution modulation strategy under state.
The characteristics of control method of scale electric automobile group system of the invention based on MMC, lies also in：The individual
The control of electric car discharge power differentiation is carried out as follows：
Step 1, the EMS by electric automobile, obtain the initial state-of-charge SOC of each electric automobile0ij, use
Family sets residence time tijWith expectation state-of-charge SOCij, the virtual state-of-charge V- for obtaining each electric automobile is calculated by formula (1)
SOCij：
V_SOCij=(SOCij-SOC0ij)/tij(1)
Wherein i, j represent the i-th bridge arm jth platform electric automobile, i.e. SOC0ij、tij、SOCijAnd V-SOCijI-th is expressed as respectively
The initial state-of-charge of bridge arm jth platform electric automobile, user set residence time, expectation state-of-charge and virtual charged shape
State；
Step 2, the size timing for the virtual state-of-charge of each electric automobile carry out ascending sort, and press the ascending order
Sequence sets virtual state-of-charge sequence number D1..Dn, is carried out when no electric automobile exits with 5 minutes for time interval timing
Ascending sort, when having electric automobile and exiting with and carry out ascending sort；Obtain virtual state-of-charge sequence number D1, virtual lotus
The virtual state-of-charge sequence number Dn of electricity condition sequence number D2 ... virtual state-of-charge sequence；
Step 3, when the scale electric automobile group system based on MMC is in charged state, as follows
Triangle carrier signal where adjustment produces each electric car corresponding to submodule drive signal：
By serial number D1..Dn virtual state-of-charge and triangle carrier signal C1, C2, C3 ..., Cn one-to-one corresponding；
Using the electricity corresponding to control signal as the virtual state-of-charge with serial number Dn caused by triangle carrier signal C1
The drive signal of submodule where electrical automobile；Void with serial number Dn-1 is used as using control signal caused by triangle carrier signal C2
The drive signal of submodule where intending the electric automobile corresponding to state-of-charge；With control signal caused by triangle carrier signal C3
Drive signal as submodule where the electric automobile corresponding to the virtual state-of-charge with serial number Dn-2；……；With three
Control signal caused by the carrier signal Cn of angle is as son where the electric automobile corresponding to the virtual state-of-charge with serial number D1
The drive signal of module；
When the scale electric automobile group system based on MMC is in discharge condition, adjustment production as follows
Triangle carrier signal where raw each electric car corresponding to submodule drive signal：
By serial number D1..Dn virtual state-of-charge and triangle carrier signal C1, C2, C3 ..., Cn is corresponded,
Using the electricity corresponding to control signal as the virtual state-of-charge with serial number D1 caused by triangle carrier signal C1
The drive signal of submodule where electrical automobile；Using control signal caused by triangle carrier signal C2 as virtual with serial number D2
The drive signal of submodule where electric automobile corresponding to state-of-charge；Made with control signal caused by triangle carrier signal C3
For the drive signal of submodule where the electric automobile corresponding to the virtual state-of-charge with serial number D3；……；Carried with triangle
Control signal caused by ripple signal Cn is as submodule where the electric automobile corresponding to the virtual state-of-charge with serial number Dn
Drive signal.
The characteristics of control method of scale electric automobile group system of the invention based on MMC, lies also in, by such as lower section
The input of submodule or excision where method control electric automobile：If modulation wave signal is more than carrier signal, corresponding to the carrier wave
The electric automobile submodule of signal is put into；Otherwise submodule where electric automobile is removed；
The characteristics of control method of scale electric automobile group system of the invention based on MMC, lies also in：Pass through setting
The redundancy of the bridge arm unit redundancy submodule quantity increase scale electric automobile group system based on MMC and reliable
Property, ensure the three-phase power balance of the system；The redundancy submodule is configured as follows：It is straight according to electric automobile
Current charge interface voltage and AC system voltage class are pressed obtains the minimum charging inlet number of bridge arm unit as following formula (2) calculates
q：
In formula (2), UgRepresent the AC grid line voltage amplitude that detection obtains, UevRepresent the charging electric vehicle of setting
Interface rated voltage, m represent modulation degree, and m span is 0~1, can be taken as 0.8；Bridge arm unit redundancy submodule is set
The redundancy of quantity is 10%, then bridge arm unit submodule quantity x is：X=q × (1+10%).
The characteristics of control method of scale electric automobile group system of the invention based on MMC, lies also in：The H bridges mould
The control mode of block is：
The modulation wave signal for making H bridge modules is vhref, then vhref=vrefa-∑vev
Wherein：∑vevThere is the voltage sum of all submodules of electric automobile input in the bridge arm unit obtained for detection；
The carrier signal of the H bridge modules is triangular wave；
If H bridge modules modulation wave signal is more than H bridge module carrier signals, full control power switch SH1 and complete in H bridge modules
Power switch SH3 conductings are controlled, it is complete to control power switch SH2 and full control power switch SH4 shut-offs；
If H bridge modules modulation wave signal is less than H module bridge carrier signals, full control power switch SH2 and complete in H bridge modules
Power switch SH4 conductings are controlled, it is complete to control power switch SH1 and full control power switch SH3 shut-offs.
Compared with prior art, the present invention has the beneficial effect that：
1st, the scale electric automobile group system of the invention based on MMC has high degree of integration, degree of modularity height, effect
Rate is high, harmonic distortion is small, switching loss is low, and fault-tolerant ability is strong, submodule can realize the hardware such as independent control spy in each phase bridge arm
Point.
2nd, the scale electric automobile group system charge-discharge electric power distribution method of the invention based on MMC can be realized both full
Sufficient user's request can utilize electric automobile to provide stable frequency for power network, support voltage, the assistant service work(such as the peak load that disappears again
Energy.
3rd, the present invention simply carries out submodule making time in bridge arm unit and redistributed, and has no effect on each bridge arm pair
Outer output, therefore control the inverter control method that simply can directly utilize maturation.
4th, the present invention ensures the three-phase power balance of the scale electric automobile group system output based on MMC, is not only
Electric automobile provides flexible charge and discharge control demand, while ensure that the quality of power supply of its output, is the electronic vapour of scale
The interface of friendly elasticity is provided between car and power network.
Table 1 charges under embodiment to be a kind of in the present invention, 5 initial state-of-charges of electric automobile of bridge arm wherein in A phases
SOC0ijValue and expected discharge time
Table 2 discharges under embodiment to be a kind of in the present invention, 5 initial state-of-charges of electric automobile of bridge arm wherein in A phases
SOC0ijValue and expected charging interval
Brief description of the drawings
Fig. 1 is the scale electric automobile group system topological diagram of MMC in the present invention；
Fig. 1 a are the structure chart of H bridge modules in the present invention；
Fig. 1 b are the structure chart of Neutron module of the present invention；
Fig. 2 a are the scale electric automobile group system control block diagram of MMC in the present invention；
Fig. 2 b are the structure of current controller in the present invention；
Fig. 3 is charge-discharge electric power differentiation control flow chart in the present invention；
Fig. 4 distributes schematic diagram for carrier signal in the present invention；
Fig. 5 is real-time state-of-charge SOC curves during 5 charging electric vehicles of bridge arm in A phases under emulated versions of the present invention；
Fig. 6 is virtual state-of-charge V-SOC curves during 5 charging electric vehicles of bridge arm in A phases under emulated versions of the present invention；
Fig. 7 is average power curve during 5 charging electric vehicles of bridge arm in A phases under emulated versions of the present invention；
Fig. 8 is real-time state-of-charge SOC curves when 5 electric automobiles of bridge arm discharge in A phases under emulated versions of the present invention；
Fig. 9 is virtual state-of-charge V-SOC curves when 5 electric automobiles of bridge arm discharge in A phases under emulated versions of the present invention；
Figure 10 is average power curve when 5 electric automobiles of bridge arm discharge in A phases under emulated versions of the present invention；
Figure 11 is the output current wave of alternating current net side under charged state under emulated versions of the present invention；
Figure 12 is the output current wave of alternating current net side under discharge condition under emulated versions of the present invention；
Embodiment
Referring to Fig. 1, the structure type of the scale electric automobile group system based on MMC is in the present embodiment：Three phases
Unit is connected to AC power network by LC wave filters respectively, and facies unit is made up of upper and lower two bridge arm units, bridge arm unit by
One reactor La, a H bridge module and n identical submodule are composed in series；Referring to Fig. 1 a, H bridge modules in the present embodiment
It is made up of four full control power device SH1, SH2, SH3, SH4 and capacitor C with anti-paralleled diode, wherein control work(entirely
Rate device SH1 and full control power device SH2 colelctor electrode are connected to DC power anode, complete to control power device SH3 and full control
Power device SH4 emitter stage is connected to DC power cathode, complete to control power device SH1 emitter stages and full control power device
SH3 colelctor electrodes are connected and are connected to plus end of the capacitor C one end as H bridge modules, it is complete control power device SH2 emitter stages with
Full control power device SH4 colelctor electrodes are connected and are connected to negative terminal of the capacitor C other end as H bridge modules；H bridge modules with
The grid of full control power device receives the drive signal from external equipment, realizes break-make；Referring to Fig. 1 b, submodule in the present embodiment
Block is made up of full control power device S1, S2 with anti-paralleled diode and a direct-current charging interface of electric automobile；Wherein,
Full control power device S1 colelctor electrode is connected with the positive pole of direct-current charging interface of electric automobile, the full emitter stage for controlling power device S1
The plus end being connected with full control power device S2 colelctor electrode as submodule, the full emitter stage for controlling power device S2 and electronic vapour
The connected negative terminal as submodule of the negative pole of car direct-current charging interface, the full grid for controlling power device S1 and S2 receive to come respectively
From the external drive signal of external equipment as submodule drive signal, submodule break-make is realized；Full control power device S1 and S2
External drive signal it is complementary；The working method of submodule is：
To control full control power device S1 be conducting, full control power device S2 is shut-off, and electric automobile is realized by access bridge arm
The input of electric automobile；To control full control power device S1 be shut-off, full control power device S2 is conducting, and electric automobile is from bridge arm quilt
Bypass, realizes the excision of electric automobile.
By controlling the working method of each bridge arm unit Neutron module, the number of electric automobile input and excision can be controlled
Amount, realizes the control to bridge arm unit output voltage；Submodule drive signal is to distribute modulation strategy to every height according to carrier wave
Module carries out SPWM modulation and obtained.
The present embodiment submodule drive signal is to distribute modulation strategy according to carrier wave as follows to enter each submodule
Row SPWM modulation obtains：
(1) as shown in Figure 2 a, the modulation wave signal v of each bridge arm unit is obtained as followsrefa
To the grid-connected current i of the AC power network of scale electric automobile group systemabcSampled, become according to Park
Theory is changed, the grid-connected current i of acquisition will be sampledabcIt is transformed into the d-axis under the synchronously rotating reference frame of line voltage vector oriented
Component and quadrature axis component, direct-axis component are watt current id, quadrature axis component is reactive current iq；Obtained by phase-locked loop pll
The azimuth of line voltageAs shown in Figure 2 b, by watt current idWith reactive current iqThe watt current with setting gives respectively
Value idrefWith reactive current set-point iqrefIt is compared, obtained difference forms converter output voltage through pi regulator respectively
D-axis command value vdrefWith quadrature axis command value vqref, wherein, watt current set-point idrefObtained by power outer shroud, it is single to realize
Position power factor is by reactive current set-point iqrefIt is arranged to zero；Scale electric automobile group system based on MMC is using load
Wavelength-division carries out SPWM controls with modulation strategy, by voltage d-axis command value vdrefWith quadrature axis command value vqrefConverted by anti-PARK,
Obtain the modulation wave signal v of each bridge arm unitrefa。
(2) distribute to use in modulation strategy in carrier wave and produce triangle carrier signal as follows：
Each bridge arm unit is connected with n platform electric automobiles simultaneously in setting scale electric automobile group system, then corresponds to
The triangle carrier signal of n stacking is set to be followed successively by C1, C2, C3 ..., Cn, the peak of each triangle carrier signal from bottom to top layer
Peak value is 1/n, the upper strata triangle wave spacing 1/n adjacent with lower floor, SPWM control signals caused by each triangle carrier signal with
Each electric automobile corresponds, for controlling the charging and discharging state and charge-discharge electric power size of corresponding electric automobile.
The control method of the scale electric automobile group system based on MMC is in the present embodiment：MMC is based on according to access
Scale electric automobile group system in electric automobile initial state-of-charge SOC0ij, user set residence time tijWith
And it is expected state-of-charge SOCij, carrier wave is used under the charge/discharge state of the scale electric automobile group system based on MMC
Distribution modulation strategy realizes individual electric car charge/discharge difference power alienation control.
As shown in figure 3, individual electric car discharge power differentiation control is carried out as follows in the present embodiment：
Step 1, the EMS by electric automobile, obtain the initial state-of-charge SOC of each electric automobile0ij, use
Family sets residence time tijWith expectation state-of-charge SOCij, the virtual state-of-charge V- for obtaining each electric automobile is calculated by formula (1)
SOCij：
V_SOCij=(SOCij-SOC0ij)/tij(1)
Wherein i, j represent the i-th bridge arm jth platform electric automobile, i.e. SOC0ij、tij、SOCijAnd V-SOCijI-th is expressed as respectively
The initial state-of-charge of bridge arm jth platform electric automobile, user set residence time, expectation state-of-charge and virtual charged shape
State.
Virtual state-of-charge V-SOC, which is more than zero explanation electric automobile, to be needed to charge, the virtual bigger theorys of state-of-charge V-SOC
The demand of bright charging electric vehicle is more positive；Virtual state-of-charge V-SOC, which is less than zero explanation electric automobile, to be allowed to discharge, virtually
The smaller explanation electric automobiles of state-of-charge V-SOC allow discharge capability bigger.
Step 2, the size timing for the virtual state-of-charge of each electric automobile carry out ascending sort, and are sorted in ascending order
Virtual state-of-charge sequence number D1..Dn is set, ascending order was carried out with 5 minutes for time interval timing when no electric automobile exits
Sequence, when having electric automobile and exiting with and carry out ascending sort；Obtain virtual state-of-charge sequence number D1, virtual charged shape
The virtual state-of-charge sequence number Dn of state sequence number D2 ... virtual state-of-charge sequence.
Carrier wave produces drive signal and electric automobile corresponding relation such as Fig. 4 institutes after virtual state-of-charge sequence in the present embodiment
Show, be for the purpose of simplifying the description SM1, SM2, SM3, SM4 wherein to correspond to electric automobile numbering with any 5 submodules of bridge arm,
SM5, simplification is designated as corresponding to V-SOC1 their virtual state-of-charge respectively, and V-SOC2, V-SOC3, V-SOC4, V-SOC5 are simultaneously
And virtual SOC has following relation V-SOC1 ＜ V-SOC2 ＜ V-SOC3 ＜ V-SOC4 ＜ V-SOC5, then obtains ascending order
Sort serial number, D1=1, D2=2, D3=3, D4=4, D5=5.(a) is that the carrier signal distribution under discharge condition is shown in Fig. 4
It is intended to, (b) is that carrier signal under charged state distributes schematic diagram in Fig. 4, is driven in Fig. 4 corresponding to (c) different carrier signals
Pulse.
Step 3, when the scale electric automobile group system based on MMC is in charged state, adjust as follows
Triangle carrier signal where producing each electric car corresponding to submodule drive signal：
By serial number D1..Dn virtual state-of-charge and triangle carrier signal C1, C2, C3 ..., Cn one-to-one corresponding.
Using the electricity corresponding to control signal as the virtual state-of-charge with serial number Dn caused by triangle carrier signal C1
The drive signal of submodule where electrical automobile；Void with serial number Dn-1 is used as using control signal caused by triangle carrier signal C2
The drive signal of submodule where intending the electric automobile corresponding to state-of-charge；With control signal caused by triangle carrier signal C3
Drive signal as submodule where the electric automobile corresponding to the virtual state-of-charge with serial number Dn-2；……；With three
Control signal caused by the carrier signal Cn of angle is as son where the electric automobile corresponding to the virtual state-of-charge with serial number D1
The drive signal of module.
As shown in table 1, the initial SOC SOC in A phases in bridge arm during 5 charging electric vehicles is set respectively0ij、
It is expected state-of-charge SOCijCharging interval t is set with userij, and it is all 00 to set electric automobile access:00 point.According to calculating
Obtained electric automobile virtual state-of-charge ascending sort sequence number D1=1, D2=2, D3=3, D4=4, D5=5 is right from small to large
Should be in carrier wave C5, C4, C3, C2, C1；Drive signal caused by carrier signal positioned at lower floor correspondingly drives virtual state-of-charge big
Submodule, turn it on time length, i.e. the charging interval is grown, and average charge power is big；Positioned at drive caused by upper layer carrier signal
Dynamic signal correspondingly drives the small submodule of virtual state-of-charge, turns it on that the time is short, and the charging interval is short, average charge power
It is small, finally realize that average charge power is distributed by user's request.
Simulation result：Fig. 5 show real-time state-of-charge SOC curves during 5 charging electric vehicles of bridge arm in A phases, 5 electricity
The initial state-of-charge SOC of electrical automobile0ijDiffered with time departure.As seen from Figure 5, the initial state-of-charge SOC of EV2 and EV40a2
And SOC0a4For 30%, state-of-charge SOC rises to 60% after wherein EV2 charges in 0.68s, and EV4 state-of-charges SOC is only
The speed of 45%, EV2 charging is more than EV4；Charging electric vehicle power curve has been also demonstrated that this point in Fig. 7；EV2 in Fig. 6
Virtual state-of-charge V-SOCa2State-of-charge V-SOC virtual more than EV4a4, demonstrating virtual state-of-charge V-SOC concepts just
True property.EV1 with the EV5 residence times are identical, but the initial state-of-charge SOC of EV10a1For the initial state-of-charge SOC of 35%, EV50a5
For 26%, thus charge volume needed for EV1 is less than EV5, and EV1 charge rates are less than EV5；Fig. 6 and Fig. 7 simulation result and theory one
Cause.EV2 logs off during t=0.68s, hereafter still can be with bio-occlusion electricity without extra electric automobile again access system, system
Electrical automobile charges, and the system of demonstrating has good redundancy and reliability.
When the scale electric automobile group system based on MMC is in discharge condition, adjustment as follows produces each
Triangle carrier signal where electric car corresponding to submodule drive signal：
By serial number D1..Dn virtual state-of-charge and triangle carrier signal C1, C2, C3 ..., Cn is corresponded,
Using the electricity corresponding to control signal as the virtual state-of-charge with serial number D1 caused by triangle carrier signal C1
The drive signal of submodule where electrical automobile；Using control signal caused by triangle carrier signal C2 as virtual with serial number D2
The drive signal of submodule where electric automobile corresponding to state-of-charge；Made with control signal caused by triangle carrier signal C3
For the drive signal of submodule where the electric automobile corresponding to the virtual state-of-charge with serial number D3；……；Carried with triangle
Control signal caused by ripple signal Cn is as submodule where the electric automobile corresponding to the virtual state-of-charge with serial number Dn
Drive signal.
As shown in table 2, the initial state-of-charge SOC in bridge arm during 5 electric automobile electric discharges in A phases is set0ijValue and user
The charging interval is set, and it is all 6 to set electric automobile turn-on time:00.According to the virtual charged shape of the electric automobile being calculated
State V-SOC ascending sort sequence numbers D1=1, D2=2, D3=3, D4=4, D5=5 correspond to carrier wave C1, C2, C3 from small to large,
C4, C5；Drive signal caused by carrier signal positioned at upper strata correspondingly drives the big submodule of virtual state-of-charge, turns it on
Time is short, i.e. discharge time is short, and average discharge power is small；It is virtual positioned at the corresponding driving of drive signal caused by lower floor's carrier signal
The small submodule of state-of-charge, time length is turned it on, discharge time length, average discharge power is big, finally realizes averaged discharge
Power distributes on demand.
Simulation result：Fig. 8 show the different initial state-of-charge SOC of 5 electric automobiles of bridge arm in A phases0ijElectric discharge it is charged
State SOC curves, wherein EV5 and the initial state-of-charge SOC of EV20a5And SOC0a2It is 90%, in t=0.4s, EV5's is charged
State SOC drops to 80% and EV2 state-of-charge SOC just drops to 85%, illustrates that EV5 discharge rates are more than EV2, as a result meet
The presetting EV5 residence times are shorter than EV2, the virtual state-of-charge V-SOC of EV50a5State-of-charge V-SOC virtual less than EV20a2Bar
Part, demonstrate the reliability of system topology and control algolithm in discharge condition.EV5 and EV4 has identical discharge time,
But the initial state-of-charge SOC of EV50a5State-of-charge SOC initial more than EV40a4, i.e. the electricity that EV5 allows to put is more than EV4.From Fig. 9
It can be drawn with Figure 10 result, the virtual state-of-charge V-SOC of EV5a5State-of-charge V-SOC virtual less than EV4a4, correspond to
EV5 average discharge powers are more than EV4, the results showed that the control algolithm can control electric automobile electric discharge speed according to user's request
Rate.
The input of submodule or excision where controlling electric automobile in the present embodiment as follows：If modulation wave signal is big
In carrier signal, it is put into corresponding to the electric automobile submodule of carrier signal；Otherwise submodule where electric automobile is removed.
By setting bridge arm unit redundancy submodule quantity to increase the scale electric automobile collection based on MMC in the present embodiment
The redundancy and reliability of group's system, ensure the three-phase power balance of system；Redundancy submodule is configured as follows：Root
Press according to direct-current charging interface of electric automobile voltage and AC system voltage class and at least filled as following formula (2) calculates acquisition bridge arm unit
Electrical interface number q：
In formula (2), UgRepresent the AC grid line voltage amplitude that detection obtains, UevRepresent the charging electric vehicle of setting
Interface rated voltage, m represent modulation degree, and m span is 0~1, can be taken as 0.8；Bridge arm unit redundancy submodule is set
The redundancy of quantity is 10%, then bridge arm unit submodule quantity x is：X=q × (1+10%).
The control mode of H bridge modules is in the present embodiment：
The modulation wave signal for making H bridge modules is vhref, then vhref=vrefa-∑vev
Wherein：∑vevThere is the voltage sum of all submodules of electric automobile input in the bridge arm unit obtained for detection；H
The carrier signal of bridge module is triangular wave；
If H bridge modules modulation wave signal is more than H bridge module carrier signals, full control power switch SH1 and complete in H bridge modules
Power switch SH3 conductings are controlled, it is complete to control power switch SH2 and full control power switch SH4 shut-offs；
If H bridge modules modulation wave signal is less than H module bridge carrier signals, full control power switch SH2 and complete in H bridge modules
Power switch SH4 conductings are controlled, it is complete to control power switch SH1 and full control power switch SH3 shut-offs.
Figure 11 and Figure 12 is the output current wave of alternating current net side, it can be seen that three under charging and discharging state respectively
Phase current magnitude, frequency are identical, 120 ° of phase mutual deviation, symmetrical during three-phase current, give tacit consent to the voltage symmetry of bulk power grid, therefore be based on
MMC scale electric automobile group system three-phase power balance.
The present invention is according to each initial state-of-charge SOC0ij, user set residence time tijWith expectation state-of-charge
SOCij, calculate virtual state-of-charge V-SOCij, carrier wave corresponding to each electric automobile is determined according to the sequence of virtual state-of-charge,
The purpose of electric car charge-discharge electric power distribution according to need is realized, meanwhile, ensure the scale electric automobile group system three based on MMC
The balance of phase power output.
Table 1
Table 2
Claims (6)
1. the scale electric automobile group system based on MMC, it is characterized in that：Three facies units connect by LC wave filters respectively
To AC power network, the facies unit is made up of upper and lower two bridge arm units, the bridge arm unit by a reactor La, one
H bridge modules and n identical submodule are composed in series；The H bridge modules are by four full control work(for carrying anti-paralleled diode
Rate device SH1, SH2, SH3, SH4 and capacitor C compositions, wherein control power device SH1 and full control power device SH2 current collection entirely
Pole is connected to DC power anode, and the full emitter stage controlled power device SH3 and control power device SH4 entirely is connected to direct current
Source negative pole, full power device SH1 emitter stages of controlling are connected with controlling power device SH3 colelctor electrodes entirely and are connected to capacitor C one end
As the plus end of H bridge modules, full power device SH2 emitter stages of controlling are connected and are connected to full control power device SH4 colelctor electrodes
Negative terminal of the capacitor C other end as H bridge modules；The H bridge modules are received from outer with controlling the grid of power device entirely
The drive signal of portion's equipment, realizes break-make；The submodule be by full control power device S1, S2 with anti-paralleled diode and
One direct-current charging interface of electric automobile composition；Wherein, control power device S1 colelctor electrode connects with electric automobile DC charging entirely
The positive pole of mouth is connected, and the full emitter stage for controlling power device S1 is connected as submodule just with full control power device S2 colelctor electrode
Terminal, the negative terminal that the full emitter stage for controlling power device S2 is connected as submodule with the negative pole of direct-current charging interface of electric automobile
Son, the full grid for controlling power device S1 and S2 receive the external drive signal from external equipment and drive letter as submodule respectively
Number, realize submodule break-make；The external drive signal of full control the power device S1 and S2 are complementary；The work side of the submodule
Formula is：
To control the full control power device S1 be conducting, full control power device S2 is shut-off, electric automobile by access bridge arm unit,
Realize the input of electric automobile；To control the full control power device S1 be shut-off, full control power device S2 is conducting, electric automobile
It is bypassed from bridge arm unit, realizes the excision of electric automobile；
By controlling the quantity of the working method of each bridge arm unit Neutron module, control electric automobile input and excision, realize
Control to bridge arm unit output voltage；The submodule drive signal is to distribute modulation strategy to each submodule according to carrier wave
SPWM modulation is carried out to obtain；
The submodule drive signal is to distribute modulation strategy according to carrier wave as follows to carry out SPWM tune to each submodule
System obtains：
(1) the modulation wave signal v of each bridge arm unit is obtained as followsrefa
To the grid-connected current i of the AC power network of the scale electric automobile group systemabcSampled, become according to Park
Theory is changed, the grid-connected current i of acquisition will be sampledabcIt is transformed into the d-axis under the synchronously rotating reference frame of line voltage vector oriented
Component and quadrature axis component, the direct-axis component are watt current id, the quadrature axis component is reactive current iq；By locking phase
Ring PLL obtains the azimuth of line voltageBy the watt current idWith reactive current iqThe watt current with setting is given respectively
Definite value idrefWith reactive current set-point iqrefIt is compared, obtained difference forms converter output electricity through pi regulator respectively
Straightening axle command value vdrefWith quadrature axis command value vqref, wherein, watt current set-point idrefObtained by power outer shroud, to realize
Unity power factor is by reactive current set-point iqrefIt is arranged to zero；The scale electric automobile group system based on MMC
SPWM controls are carried out using carrier wave distribution modulation strategy, by the voltage d-axis command value vdrefWith quadrature axis command value vqrefBy
Anti- PARK conversion, obtains the modulation wave signal v of each bridge arm unitrefa；
(2) distribute to use in modulation strategy in the carrier wave and produce triangle carrier signal as follows：
Set each bridge arm unit in the scale electric automobile group system while be connected with n platform electric automobiles, then correspond to
The triangle carrier signal of n stacking is set to be followed successively by C1, C2, C3 ..., Cn, the peak of each triangle carrier signal from bottom to top layer
Peak value is 1/n, the upper strata triangle wave spacing 1/n adjacent with lower floor, SPWM control signals caused by each triangle carrier signal with
Each electric automobile corresponds, for controlling the charging and discharging state and charge-discharge electric power size of corresponding electric automobile.
2. the control method of the scale electric automobile group system based on MMC described in a kind of claim 1, it is characterized in that：Root
According to the initial state-of-charge SOC of the electric automobile in the access scale electric automobile group system based on MMC0ij, user
Set residence time tijAnd it is expected state-of-charge SOCij, in filling for the scale electric automobile group system based on MMC
Individual charging electric vehicle/discharge power differentiation control is realized using carrier wave distribution modulation strategy under electricity/discharge condition.
3. the control method of the scale electric automobile group system according to claim 2 based on MMC, it is characterized in that institute
Individual electric automobile discharge power differentiation control is stated to carry out as follows：
Step 1, the EMS by electric automobile, obtain the initial state-of-charge SOC of each electric automobile0ij, Yong Hushe
Determine residence time tijWith expectation state-of-charge SOCij, the virtual state-of-charge V- for obtaining each electric automobile is calculated by formula (1)
SOCij：
V_SOCij=(SOCij-SOC0ij)/tij (1)
Wherein i, j represent the i-th bridge arm jth platform electric automobile, i.e. SOC0ij、tij、SOCijAnd V-SOCijThe i-th bridge arm is expressed as respectively
The initial state-of-charge of jth platform electric automobile, user set the residence time, it is expected state-of-charge and virtual state-of-charge；
Step 2, the size timing for the virtual state-of-charge of each electric automobile carry out ascending sort, and press the ascending sort
Virtual state-of-charge sequence number D1..Dn is set, ascending order was carried out with 5 minutes for time interval timing when no electric automobile exits
Sequence, when having electric automobile and exiting with and carry out ascending sort；Obtain virtual state-of-charge sequence number D1, virtual charged shape
The virtual state-of-charge sequence number Dn of state sequence number D2 ... virtual state-of-charge sequence；
Step 3, when the scale electric automobile group system based on MMC is in charged state, adjust as follows
Triangle carrier signal where producing each electric automobile corresponding to submodule drive signal：
By serial number D1..Dn virtual state-of-charge and triangle carrier signal C1, C2, C3 ..., Cn one-to-one corresponding；
Using the electronic vapour corresponding to control signal as the virtual state-of-charge with serial number Dn caused by triangle carrier signal C1
The drive signal of submodule where car；The virtual lotus with serial number Dn-1 is used as using control signal caused by triangle carrier signal C2
The drive signal of submodule where electric automobile corresponding to electricity condition；Using control signal caused by triangle carrier signal C3 as
With the drive signal of submodule where the electric automobile corresponding to serial number Dn-2 virtual state-of-charge；……；Carried with triangle
Control signal caused by ripple signal Cn is as submodule where the electric automobile corresponding to the virtual state-of-charge with serial number D1
Drive signal；
When the scale electric automobile group system based on MMC is in discharge condition, adjustment as follows produces each
Triangle carrier signal where electric automobile corresponding to submodule drive signal：
By serial number D1..Dn virtual state-of-charge and triangle carrier signal C1, C2, C3 ..., Cn is corresponded,
Using the electronic vapour corresponding to control signal as the virtual state-of-charge with serial number D1 caused by triangle carrier signal C1
The drive signal of submodule where car；Using control signal caused by triangle carrier signal C2 as virtual charged with serial number D2
The drive signal of submodule where electric automobile corresponding to state；Using control signal caused by triangle carrier signal C3 as with
The drive signal of submodule where electric automobile corresponding to serial number D3 virtual state-of-charge；……；Believed with triangular carrier
The drive of number control signal caused by Cn as submodule where the electric automobile corresponding to the virtual state-of-charge with serial number Dn
Dynamic signal.
4. the control method of the scale electric automobile group system according to claim 2 based on MMC, as follows
The input of submodule or excision where controlling electric automobile：If modulation wave signal is more than carrier signal, believe corresponding to the carrier wave
Number electric automobile submodule be put into；Otherwise submodule where electric automobile is removed.
5. the control method of the scale electric automobile group system according to claim 2 based on MMC, it is characterized in that：
By the redundancy for setting the bridge arm unit redundancy submodule quantity increase scale electric automobile group system based on MMC
And reliability, ensure the three-phase power balance of the system；The redundancy submodule is configured as follows：According to electronic
Automobile direct-current charging interface voltage and AC system voltage class are pressed at least to charge as following formula (2) calculates the acquisition bridge arm unit
Number of ports q：
<mrow>
<mi>q</mi>
<mo>=</mo>
<mfrac>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
<msub>
<mi>U</mi>
<mrow>
<mi>e</mi>
<mi>v</mi>
</mrow>
</msub>
</mfrac>
<mo>&times;</mo>
<mfrac>
<mn>1</mn>
<mi>m</mi>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula (2), UgRepresent the AC grid line voltage amplitude that detection obtains, UevRepresent the electric vehicle charge interface of setting
Rated voltage, m represent modulation degree, and m span is 0~1；Set bridge arm unit redundancy submodule quantity redundancy be
10%, then bridge arm unit submodule quantity x be：X=q × (1+10%).
6. the control method of the scale electric automobile group system according to claim 2 based on MMC, it is characterized in that：
The control mode of the H bridge modules is：
The modulation wave signal for making H bridge modules is vhref, then vhref=vrefa-∑vev
Wherein：∑vevThere is the voltage sum of all submodules of electric automobile input in the bridge arm unit obtained for detection；The H
The carrier signal of bridge module is triangular wave；
If H bridge modules modulation wave signal is more than H bridge module carrier signals, full control power switch SH1 controls work(with complete in H bridge modules
Rate switch SH3 conductings, it is complete to control power switch SH2 and full control power switch SH4 shut-offs；
If H bridge modules modulation wave signal is less than H module bridge carrier signals, full control power switch SH2 controls work(with complete in H bridge modules
Rate switch SH4 conductings, it is complete to control power switch SH1 and full control power switch SH3 shut-offs.
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| WO2018001455A1 (en) * | 2016-06-28 | 2018-01-04 | Abb Schweiz Ag | Protection of semiconductors in power converters |
| CN106329978B (en) * | 2016-09-28 | 2018-11-09 | 南京比恩机电科技有限公司 | The distributed frame and control method of high voltagehigh frequency static dust-removing power inverter circuit |
| CN111711376A (en) * | 2017-02-28 | 2020-09-25 | 湖南大学 | Selection method of modulation strategy of MMC converter valve |
| CN106899031B (en) * | 2017-02-28 | 2019-04-19 | 湖南大学 | Redundancy optimization method for full-bridge MMC converter valve in flexible direct-current power transmission system |
| CN109094418B (en) * | 2018-09-27 | 2021-07-06 | 沈阳工程学院 | Electric automobile active sequencing charging control method based on layer-by-layer optimization strategy |
| CN109572478B (en) * | 2018-10-15 | 2020-07-28 | 上海交通大学 | Online stable charging system and method for electric vehicle of charging station |
| CN111688539B (en) * | 2020-06-04 | 2023-07-28 | 国网天津市电力公司电力科学研究院 | Multi-level energy storage type electric vehicle direct current charging optimal control system and method |
| CN111559266B (en) * | 2020-06-10 | 2021-10-26 | 南京工程学院 | Charging device for electric automobile |
| CN113691157B (en) * | 2021-08-30 | 2022-04-19 | 燕山大学 | Rotation discontinuous control method for modular multilevel converter |
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| US7352597B2 (en) * | 2005-07-18 | 2008-04-01 | Xi'an Jiaotong University | Comprehensive power quality controller for substation in power system |
| CN104934989A (en) * | 2015-07-09 | 2015-09-23 | 哈尔滨理工大学 | Reactive power compensation device based on novel modular multilevel topology and control method thereof |
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