CN105449684A - Large-scale electric vehicle trunking system based on MMC and control method thereof - Google Patents
Large-scale electric vehicle trunking system based on MMC and control method thereof Download PDFInfo
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- CN105449684A CN105449684A CN201510999100.4A CN201510999100A CN105449684A CN 105449684 A CN105449684 A CN 105449684A CN 201510999100 A CN201510999100 A CN 201510999100A CN 105449684 A CN105449684 A CN 105449684A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000004069 differentiation Effects 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 230000001174 ascending effect Effects 0.000 claims description 15
- 239000000969 carrier Substances 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 9
- 208000035126 Facies Diseases 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 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
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- 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 large-scale electric vehicle trunking system based on MMC and a control method thereof. The large-scale electric vehicle trunking system is characterized in that three phase elements composed of an electric reactor, an H-bridge module and a sub-module are connected to an alternating current power grid through an LC filter to form a topological structure of the large-scale electric vehicle trunking system based on MMC, virtual electrical charge states are calculated through the initial electrical charge state, user set standing time and expected electrical charge state of each electric vehicle, the sub-module of the electric vehicle corresponding to a driving signal generated by each carrier signal is determined according to the ranking of the virtual electrical charge states, the differentiation control for electric vehicle charging and discharging power connected to the sub-modules according to user requirements is realized, and the control for three-phase power balance and unit power factors on a power grid side is realized. The system is high in integration degree, high in modularization degree, high in efficiency, little in harmonic distortion, low in switching loss and high in fault-tolerant capacity, and independent control for the sub-modules in each-phase bridge arms can be realized.
Description
Technical field
The present invention relates to electric automobile cluster field; be applied to extensive electric automobile charging station, electric automobile to electrical network (Vehicle-to-grid; the occasions such as realization V2G), specifically relate to a kind of scale electric automobile group system based on MMC and control method thereof.
Background technology
Because of the feature of electric automobile (ElectricVehicle, EV) no pollution, prediction Future Ten year electric automobile is by extensive development.Electric automobile accesses electrical network on a large scale, will carry out a series of negative effect to traditional electrical guipure, such as, increase distributed network peak load, increase electric network swim uncertain, increase harmonic pollution in electric power net, affect the operation plan of distributed power generation.Therefore study the how integrated EV of scale, reduce its impact on electrical network to greatest extent; Allow EV serve as energy storage device in following electrical network, the assistant services such as stabilized frequency are provided for bulk power grid, also will have very large realistic meaning.
In order to make full use of the assistant service effect of cluster electric automobile to intelligent grid, what meet user uses car demand simultaneously, need consider hardware and software two aspects.Hardware aspect needs the topological structure of efficient, an accessible site large-scale cluster electric automobile; Software aspect needs an EMS, realizes electric automobile and rationalizes management to electrical network discharge and recharge.The bus difference that the efficient integrated topological of existing electric automobile generally connects according to electric automobile is divided three classes: DC bus is integrated, ac bus is integrated and alternating current-direct current bus hybrid integrated.Wherein a kind of method is, electric automobile is by DC/DC converter, parallel connection is integrated on DC bus, this method centralized control can be beneficial to coordination, but need the central AC/DC controller of increase by be connected with electrical network, in fact this structure will convert through two stage power in electric automobile charge and discharge process, and efficiency is low; Another kind method is, the integration mode that electric automobile is connected in parallel on ac bus by AC/DC converter, and these class methods are easy to system extension, but need to take decentralized control method, are unfavorable for that system coordination controls.In sum, these topologys and control strategy mainly pay close attention to the scheduling requirement of the integrated of electric automobile and electrical network, rarely have consideration user's request.When electric automobile assembles on a large scale, the user in group system meets the assistant service ability that self-demand may reduce system, even causes the phenomenon at " Shang Jia peak, peak ".
Summary of the invention
The present invention is the deficiency for avoiding existing for above-mentioned prior art, provides a kind of scale electric automobile group system based on MMC and control method thereof, realizes individual electric motor car charge-discharge electric power differentiation and controls.Control object is the scale electric automobile group system based on MMC, by gathering the initial state-of-charge SOC during scale electric automobile group system of electric automobile access based on MMC
0ij, user sets time of staying t
ijwith expectation state-of-charge SOC
ij, according to virtual state-of-charge V-SOC
ijthe carrier signal that each electric automobile is corresponding is determined in sequence, realizes electric car charge-discharge electric power demand assigned object, and ensures the balance of MMC system three-phase power output.
The present invention is that technical solution problem adopts following technical scheme:
The feature that the present invention is based on the scale electric automobile group system of MMC is: three facies units are connected to AC electrical network respectively through LC filter, described facies unit is made up of upper and lower two bridge arm units, and described bridge arm unit is composed in series with n identical submodule by a reactor La, a H bridge module, described H bridge module is by four full control power device SH1 with anti-paralleled diode, SH2, SH3, SH4 and capacitor C forms, the collector electrode wherein entirely controlling power device SH1 and full control power device SH2 is connected to DC power anode, the emitter of full control power device SH3 and full control power device SH4 is connected to DC power cathode, full control power device SH1 emitter with entirely control power device SH3 collector electrode and be connected and the plus end of one end as H bridge module being connected to capacitor C, full control power device SH2 emitter with entirely control power device SH4 collector electrode and be connected and the negative terminal of the other end as H bridge module being connected to capacitor C, described H bridge module accepts the drive singal from external equipment with the grid entirely controlling power device, realizes break-make, described submodule is made up of full control power device S1, a S2 and direct-current charging interface of electric automobile with anti-paralleled diode, wherein, the collector electrode of full control power device S1 is connected with the positive pole of direct-current charging interface of electric automobile, the emitter of full control power device S1 is connected as the plus end of submodule with the collector electrode entirely controlling power device S2, the emitter of full control power device S2 is connected as the negative terminal of submodule with the negative pole of direct-current charging interface of electric automobile, the grid of full control power device S1 and S2 accepts external drive signal from external equipment respectively as submodule drive singal, realizes submodule break-make, the external drive signal of described full control power device S1 and S2 is complementary, the working method of described submodule is:
Controlling described full control power device S1 is that conducting, full control power device S2 turn off, and electric automobile is access in bridge arm unit, realizes the input of electric automobile; Controlling described full control power device S1 for turning off, entirely controlling power device S2 is conducting, and electric 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 quantity that electric automobile drops into and excises can be controlled, realize the control to bridge arm unit output voltage; Described submodule drive singal carries out SPWM modulation according to allocation of carriers modulation strategy to each submodule to obtain.
The feature that the present invention is based on the scale electric automobile group system of MMC is also: described submodule drive singal carries out SPWM modulation according to allocation of carriers modulation strategy to each submodule as follows to obtain:
(1) the modulation wave signal v of each bridge arm unit is obtained as follows
refa
To the grid-connected current i of the AC electrical network of described scale electric automobile group system
abcsample, according to Park transformation theory, by the grid-connected current i that sampling obtains
abcbe transformed into the direct axis component under the synchronously rotating reference frame of line voltage vector oriented and quadrature axis component, described direct axis component is active current i
d, described quadrature axis component is reactive current i
q; The azimuth of line voltage is obtained by phase-locked loop pll
by described active current i
dwith reactive current i
qrespectively with the active current set-point i set
drefwith reactive current set-point i
qrefcompare, the difference obtained forms converter output voltage d-axis command value v through pi regulator respectively
drefwith quadrature axis command value v
qref, wherein, active current set-point i
drefobtained by power outer shroud, for realizing unity power factor by reactive current set-point i
qrefbe set to zero; The described scale electric automobile group system based on MMC adopts allocation of carriers modulation strategy to carry out SPWM control, by described voltage d-axis command value v
drefwith quadrature axis command value v
qrefconvert through anti-PARK, obtain the modulation wave signal v of each bridge arm unit
refa;
(2) adopt in described allocation of carriers modulation strategy and produce triangle carrier signal as follows:
Set each bridge arm unit in described scale electric automobile group system and be connected with n platform electric automobile simultaneously; then the corresponding individual stacked triangle carrier signal of n that arranges is followed successively by C1 from bottom to top layer; C2; C3 ..., Cn; the peak-to-peak value of each triangle carrier signal is 1/n; the triangular wave interval 1/n that upper strata is adjacent with lower floor, the SPWM control signal that each triangle carrier signal produces and each electric automobile one_to_one corresponding, for controlling charging and discharging state and the charge-discharge electric power size of corresponding electric automobile.
The feature that the present invention is based on the control method of the scale electric automobile group system of MMC is: according to the described initial state-of-charge SOC based on the electric automobile in the scale electric automobile group system of MMC of access
0ij, user sets time of staying t
ijand expect state-of-charge SOC
ij, under the charge/discharge state of the described scale electric automobile group system based on MMC, adopt allocation of carriers modulation strategy to realize individual electric motor car charge/discharge difference power alienation control.
The feature that the present invention is based on the control method of the scale electric automobile group system of MMC is also: described individual electric motor car discharge power differentiation controls to carry out as follows:
Step 1, EMS by electric automobile, obtain the initial state-of-charge SOC of each electric automobile
0ij, user sets time of staying t
ijwith expectation state-of-charge SOC
ij, the virtual state-of-charge V-SOC obtaining each electric automobile is calculated by formula (1)
ij:
V_SOC
ij＝(SOC
ij-SOC
0ij)/t
ij(1)
Wherein i, j represent the i-th brachium pontis jth platform electric automobile, i.e. SOC
0ij, t
ij, SOC
ijand V-SOC
ijbe expressed as the initial state-of-charge of the i-th brachium pontis jth platform electric automobile respectively, user sets the time of staying, expect state-of-charge and virtual state-of-charge;
Step 2, for the virtual state-of-charge of each electric automobile size timing carry out ascending sort, and set virtual state-of-charge sequence number D1..Dn by described ascending sort, when not having electric automobile to exit with 5 minutes for the time interval timing carry out ascending sort, when having electric automobile and exiting with and carry out ascending sort; Obtain virtual state-of-charge sequence number D1, virtual state-of-charge sequence number D2 ... the virtual state-of-charge sequence of virtual state-of-charge sequence number Dn;
Step 3, when the described scale electric automobile group system based on MMC is in charged state, adjustment produces the triangle carrier signal corresponding to each electric motor car place submodule drive singal as follows:
Be virtual state-of-charge and the triangle carrier signal C1 of D1..Dn by sequence number, C2, C3 ..., Cn one_to_one corresponding;
The control signal produced using triangle carrier signal C1 is as the drive singal with the sequence number electric automobile place submodule that is Dn corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C2 is as the drive singal with the sequence number electric automobile place submodule that is Dn-1 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C3 is as the drive singal with the sequence number electric automobile place submodule that is Dn-2 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal Cn is as the drive singal with the sequence number electric automobile place submodule that is D1 corresponding to virtual state-of-charge;
When the described scale electric automobile group system based on MMC is in discharge condition, adjustment produces the triangle carrier signal corresponding to the submodule drive singal of each electric motor car place as follows:
Be virtual state-of-charge and the triangle carrier signal C1 of D1..Dn by sequence number, C2, C3 ..., Cn one_to_one corresponding,
The control signal produced using triangle carrier signal C1 is as the drive singal with the sequence number electric automobile place submodule that is D1 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C2 is as the drive singal with the sequence number electric automobile place submodule that is D2 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C3 is as the drive singal with the sequence number electric automobile place submodule that is D3 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal Cn is as the drive singal with the sequence number electric automobile place submodule that is Dn corresponding to virtual state-of-charge.
The feature that the present invention is based on the control method of the scale electric automobile group system of MMC is also, control input or the excision of electric automobile place submodule as follows: if modulation wave signal is greater than carrier signal, the electric automobile submodule corresponding to described carrier signal is put into; Otherwise electric automobile place submodule is cut;
The feature that the present invention is based on the control method of the scale electric automobile group system of MMC is also: increasing the described redundancy based on the scale electric automobile group system of MMC and reliability by arranging bridge arm unit redundancy submodule quantity, ensureing the three-phase power balance of described system; Described redundancy submodule is arranged as follows: obtain described bridge arm unit minimum charging inlet number q according to direct-current charging interface of electric automobile voltage and AC system electric pressure by calculating as shown in the formula (2):
In formula (2), U
grepresent the AC grid line voltage magnitude detecting and obtain, U
evrepresent the electric vehicle charge interface rated voltage of setting, m represents modulation degree, and the span of m is 0 ~ 1, can be taken as 0.8; The redundancy arranging bridge arm unit redundancy submodule quantity is 10%, then bridge arm unit submodule quantity x is: x=q × (1+10%).
The feature that the present invention is based on the control method of the scale electric automobile group system of MMC is also: the control mode of described H bridge module is:
The modulation wave signal of H bridge module is made to be v
href, then v
href=v
refa-∑ v
ev
Wherein: ∑ v
evfor detecting the voltage sum of all submodules having electric automobile to drop in the bridge arm unit of acquisition; The carrier signal of described H bridge module is triangular wave;
If H bridge module modulation wave signal is greater than H bridge module carrier signal, then full control power switch SH1 and full control power switch SH3 conducting in H bridge module, full control power switch SH2 and full control power switch SH4 turns off;
If H bridge module modulation wave signal is less than H module bridge carrier signal, then full control power switch SH2 and full control power switch SH4 conducting in H bridge module, full control power switch SH1 and full control power switch SH3 turns off.
Compared with prior art, beneficial effect of the present invention is embodied in:
1, the scale electric automobile group system that the present invention is based on MMC has that degree of integration is high, the degree of modularity is high, efficiency is high, harmonic distortion is little, switching loss is low, and in strong, each phase brachium pontis of fault-tolerant ability, submodule can realize the hardware characteristicses such as independent control.
2, the scale electric automobile group system charge-discharge electric power distribution method that the present invention is based on MMC can realize not only meeting consumers' demand but also can utilize electric automobile for electrical network stabilized frequency be provided, support voltage, disappear the assistant service functions such as peak load.
3, the present invention just carries out redistributing of submodule making time in bridge arm unit, does not affect the output that each brachium pontis is external, therefore controls simply directly to utilize ripe inverter control method.
4, the present invention ensures the three-phase power balance that exports based on the scale electric automobile group system of MMC; be not only electric automobile and provide charge and discharge control demand flexibly; ensure that its quality of power supply exported, for providing close friend, flexible interface between scale electric automobile and electrical network simultaneously.
Table 1 charges under embodiment for one in the present invention, the wherein initial state-of-charge SOC of brachium pontis 5 electric automobiles in A phase
0ijbe worth and expect discharge time
Table 2 discharges under embodiment for one in the present invention, the wherein initial state-of-charge SOC of brachium pontis 5 electric automobiles in A phase
0ijvalue and expection charging interval
Accompanying drawing explanation
Fig. 1 is the scale electric automobile group system topological diagram of MMC in the present invention;
Fig. 1 a is the structure chart of Neutron module of the present invention;
Fig. 1 b is the structure chart of H bridge module in the present invention;
Fig. 2 a is the scale electric automobile group system control block diagram of MMC in the present invention;
Fig. 2 b is 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 is that in the present invention, carrier signal distributes schematic diagram;
Fig. 5 is real-time state-of-charge SOC curve during brachium pontis 5 charging electric vehicles in A phase under emulated versions of the present invention;
Fig. 6 is virtual state-of-charge V-SOC curve during brachium pontis 5 charging electric vehicles in A phase under emulated versions of the present invention;
Fig. 7 is average power curve during brachium pontis 5 charging electric vehicles in A phase under emulated versions of the present invention;
Fig. 8 is real-time state-of-charge SOC curve when brachium pontis 5 electric automobiles discharge in A phase under emulated versions of the present invention;
Fig. 9 is virtual state-of-charge V-SOC curve when brachium pontis 5 electric automobiles discharge in A phase under emulated versions of the present invention;
Figure 10 is average power curve when brachium pontis 5 electric automobiles discharge in A phase under emulated versions of the present invention;
Figure 11 is the output current wave of AC network side under charged state under emulated versions of the present invention;
Figure 12 is the output current wave of AC network side under discharge condition under emulated versions of the present invention;
Embodiment
See Fig. 1, the version of the scale electric automobile group system based on MMC in the present embodiment is: three facies units are connected to AC electrical network respectively through LC filter, facies unit is made up of upper and lower two bridge arm units, and bridge arm unit is composed in series with n identical submodule by a reactor La, a H bridge module, see Fig. 1 a, in the present embodiment, H bridge module is by four full control power device SH1 with anti-paralleled diode, SH2, SH3, SH4 and capacitor C forms, the collector electrode wherein entirely controlling power device SH1 and full control power device SH2 is connected to DC power anode, the emitter of full control power device SH3 and full control power device SH4 is connected to DC power cathode, full control power device SH1 emitter with entirely control power device SH3 collector electrode and be connected and the plus end of one end as H bridge module being connected to capacitor C, full control power device SH2 emitter with entirely control power device SH4 collector electrode and be connected and the negative terminal of the other end as H bridge module being connected to capacitor C, H bridge module accepts the drive singal from external equipment with the grid entirely controlling power device, realizes break-make, see Fig. 1 b, the present embodiment Neutron module is made up of full control power device S1, a S2 and direct-current charging interface of electric automobile with anti-paralleled diode, wherein, the collector electrode of full control power device S1 is connected with the positive pole of direct-current charging interface of electric automobile, the emitter of full control power device S1 is connected as the plus end of submodule with the collector electrode entirely controlling power device S2, the emitter of full control power device S2 is connected as the negative terminal of submodule with the negative pole of direct-current charging interface of electric automobile, the grid of full control power device S1 and S2 accepts external drive signal from external equipment respectively as submodule drive singal, realizes submodule break-make, the external drive signal of full control power device S1 and S2 is complementary, the working method of submodule is:
Control full control power device S1 to be conducting, entirely to control power device S2 for turning off, electric automobile is access in brachium pontis, realizes the input of electric automobile; Control full control power device S1 is shutoff, full control power device S2 is conducting, and electric automobile is bypassed from brachium pontis, realizes the excision of electric automobile.
By controlling the working method of each bridge arm unit Neutron module, the quantity that electric automobile drops into and excises can be controlled, realize the control to bridge arm unit output voltage; Submodule drive singal carries out SPWM modulation according to allocation of carriers modulation strategy to each submodule to obtain.
The present embodiment submodule drive singal carries out SPWM modulation according to allocation of carriers modulation strategy to each submodule as follows to obtain:
(1) the modulation wave signal v of each bridge arm unit as shown in Figure 2 a, is obtained as follows
refa
To the grid-connected current i of the AC electrical network of scale electric automobile group system
abcsample, according to Park transformation theory, by the grid-connected current i that sampling obtains
abcbe transformed into the direct axis component under the synchronously rotating reference frame of line voltage vector oriented and quadrature axis component, direct axis component is active current i
d, quadrature axis component is reactive current i
q; The azimuth of line voltage is obtained by phase-locked loop pll
as shown in Figure 2 b, by active current i
dwith reactive current i
qrespectively with the active current set-point i set
drefwith reactive current set-point i
qrefcompare, the difference obtained forms converter output voltage d-axis command value v through pi regulator respectively
drefwith quadrature axis command value v
qref, wherein, active current set-point i
drefobtained by power outer shroud, for realizing unity power factor by reactive current set-point i
qrefbe set to zero; Scale electric automobile group system based on MMC adopts allocation of carriers modulation strategy to carry out SPWM control, by voltage d-axis command value v
drefwith quadrature axis command value v
qrefconvert through anti-PARK, obtain the modulation wave signal v of each bridge arm unit
refa.
(2) adopt in allocation of carriers modulation strategy and produce triangle carrier signal as follows:
In setting scale electric automobile group system, each bridge arm unit is connected with n platform electric automobile simultaneously; then the corresponding individual stacked triangle carrier signal of n that arranges is followed successively by C1 from bottom to top layer; C2; C3 ..., Cn; the peak-to-peak value of each triangle carrier signal is 1/n; the triangular wave interval 1/n that upper strata is adjacent with lower floor, the SPWM control signal that each triangle carrier signal produces and each electric automobile one_to_one corresponding, for controlling charging and discharging state and the charge-discharge electric power size of corresponding electric automobile.
The control method of the scale electric automobile group system based on MMC in the present embodiment is: according to the initial state-of-charge SOC of access based on the electric automobile in the scale electric automobile group system of MMC
0ij, user sets time of staying t
ijand expect state-of-charge SOC
ij, under the charge/discharge state of the scale electric automobile group system based on MMC, adopt allocation of carriers modulation strategy to realize individual electric motor car charge/discharge difference power alienation control.
As shown in Figure 3, in the present embodiment, individual electric motor car discharge power differentiation controls to carry out as follows:
Step 1, EMS by electric automobile, obtain the initial state-of-charge SOC of each electric automobile
0ij, user sets time of staying t
ijwith expectation state-of-charge SOC
ij, the virtual state-of-charge V-SOC obtaining each electric automobile is calculated by formula (1)
ij:
V_SOC
ij＝(SOC
ij-SOC
0ij)/t
ij(1)
Wherein i, j represent the i-th brachium pontis jth platform electric automobile, i.e. SOC
0ij, t
ij, SOC
ijand V-SOC
ijbe expressed as the initial state-of-charge of the i-th brachium pontis jth platform electric automobile respectively, user sets the time of staying, expect state-of-charge and virtual state-of-charge.
Virtual state-of-charge V-SOC is greater than zero explanation electric automobile and needs charging, and the demand of virtual state-of-charge V-SOC larger explanation charging electric vehicle is more positive; Virtual state-of-charge V-SOC is less than zero explanation electric automobile and allows electric discharge, and virtual state-of-charge V-SOC less explanation electric automobile allows discharge capability larger.
Step 2, for the virtual state-of-charge of each electric automobile size timing carry out ascending sort, and set virtual state-of-charge sequence number D1..Dn by ascending sort, when not having electric automobile to exit with 5 minutes for the time interval timing carry out ascending sort, when having electric automobile and exiting with and carry out ascending sort; Obtain virtual state-of-charge sequence number D1, virtual state-of-charge sequence number D2 ... the virtual state-of-charge sequence of virtual state-of-charge sequence number Dn.
In the present embodiment, the rear carrier wave generation drive singal of virtual state-of-charge sequence and electric automobile corresponding relation are as shown in Figure 4, for the purpose of simplifying the description to be wherein numbered SM1 with the corresponding electric automobile of any 5 submodules of brachium pontis, SM2, SM3, SM4, SM5, their virtual state-of-charge simplifies respectively to be designated as and corresponds to V-SOC1, V-SOC2, V-SOC3, V-SOC4, V-SOC5 and virtual SOC has following relation V-SOC1 < V-SOC2 < V-SOC3 < V-SOC4 < V-SOC5, so obtaining ascending sort sequence number is, D1=1, D2=2, D3=3, D4=4, D5=5.In Fig. 4, (a) is the carrier signal distribution schematic diagram under discharge condition, and in Fig. 4, (b) is the carrier signal distribution schematic diagram under charged state, the driving pulse that in Fig. 4, (c) different carrier signal is corresponding.
Step 3, when the scale electric automobile group system based on MMC is in charged state, adjustment produces the triangle carrier signal corresponding to each electric motor car place submodule drive singal as follows:
Be virtual state-of-charge and the triangle carrier signal C1 of D1..Dn by sequence number, C2, C3 ..., Cn one_to_one corresponding.
The control signal produced using triangle carrier signal C1 is as the drive singal with the sequence number electric automobile place submodule that is Dn corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C2 is as the drive singal with the sequence number electric automobile place submodule that is Dn-1 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C3 is as the drive singal with the sequence number electric automobile place submodule that is Dn-2 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal Cn is as the drive singal with the sequence number electric automobile place submodule that is D1 corresponding to virtual state-of-charge.
As shown in table 1, set the initial SOC SOC in A phase in brachium pontis during 5 charging electric vehicles respectively
0ij, expect state-of-charge SOC
ijcharging interval t is set with user
ij, and set electric automobile access be all 00:00 point.According to the electric automobile calculated virtual state-of-charge ascending sort sequence number D1=1, D2=2, D3=3, D4=4, D5=5 correspond to carrier wave C5 from small to large, C4, C3, C2, C1; The drive singal correspondence that the carrier signal being positioned at lower floor produces drives the submodule that virtual state-of-charge is large, and make its ON time long, namely the charging interval is long, and average charge power is large; The drive singal correspondence being positioned at the generation of upper layer carrier signal drives the submodule that virtual state-of-charge is little, and make its ON time short, the charging interval is short, and average charge power is little, finally realizes average charge power and distributes by user's request.
Simulation result: real-time state-of-charge SOC curve when Figure 5 shows that brachium pontis 5 charging electric vehicles in A phase, 5 initial state-of-charge SOC of electric automobile
0ijall not identical with time departure.As seen from Figure 5, the initial state-of-charge SOC of EV2 and EV4
0a2and SOC
0a4be 30%, wherein EV2 charge when 0.68s after state-of-charge SOC rise to 60%, and EV4 state-of-charge SOC be only 45%, EV2 charging speed be greater than EV4; In Fig. 7, charging electric vehicle power curve demonstrates this point equally; The virtual state-of-charge V-SOC of EV2 in Fig. 6
a2be greater than the virtual state-of-charge V-SOC of EV4
a4, demonstrate the correctness of virtual state-of-charge V-SOC concept.EV1 with the EV5 time of staying is identical, but EV1 is initial state-of-charge SOC
0a1be the initial state-of-charge SOC of 35%, EV5
0a5be 26%, needed for EV1, charge volume is less than EV5 thus, and EV1 charge rate is less than EV5; The simulation result of Fig. 6 with Fig. 7 is consistent with theory.During t=0.68s, EV2 logs off, and does not after this have extra electric automobile connecting system again, and system still can bio-occlusion charging electric vehicle, 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 produces the triangle carrier signal corresponding to the submodule drive singal of each electric motor car place as follows:
Be virtual state-of-charge and the triangle carrier signal C1 of D1..Dn by sequence number, C2, C3 ..., Cn one_to_one corresponding,
The control signal produced using triangle carrier signal C1 is as the drive singal with the sequence number electric automobile place submodule that is D1 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C2 is as the drive singal with the sequence number electric automobile place submodule that is D2 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C3 is as the drive singal with the sequence number electric automobile place submodule that is D3 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal Cn is as the drive singal with the sequence number electric automobile place submodule that is Dn corresponding to virtual state-of-charge.
As shown in table 2, the initial state-of-charge SOC in setting A phase in brachium pontis during 5 electric automobile electric discharges
0ijvalue and user set the charging interval, and to set electric automobile turn-on time be all 6:00.According to the electric automobile calculated virtual state-of-charge V-SOC ascending sort sequence number D1=1, D2=2, D3=3, D4=4, D5=5 correspond to carrier wave C1 from small to large, C2, C3, C4, C5; The drive singal correspondence that the carrier signal being positioned at upper strata produces drives the submodule that virtual state-of-charge is large, and make its ON time short, namely discharge time is short, and average discharge power is little; The drive singal correspondence being positioned at lower floor's carrier signal generation drives the submodule that virtual state-of-charge is little, and make its ON time long, discharge time is long, and average discharge power is large, finally realizes average discharge power by demand assignment.
Simulation result: Figure 8 shows that the different initial state-of-charge SOC of brachium pontis 5 electric automobiles in A phase
0ijelectric discharge state-of-charge SOC curve, the wherein initial state-of-charge SOC of EV5 and EV2
0a5and SOC
0a2be 90%, when t=0.4s, the state-of-charge SOC of EV5 drops to 80% and the state-of-charge SOC of EV2 just drops to 85%, and illustrate that EV5 discharge rate is greater than EV2, it is shorter than EV2 that result meets the presetting EV5 time of staying, the virtual state-of-charge V-SOC of EV5
0a5be less than the virtual state-of-charge V-SOC of EV2
0a2condition, demonstrate system topology and the control algolithm reliability in discharge condition.EV5 and EV4 has identical discharge time, but the initial state-of-charge SOC of EV5
0a5be greater than the initial state-of-charge SOC of EV4
0a4, namely EV5 allows the electricity put to be greater than EV4.Can draw from the result of Fig. 9 and Figure 10, the virtual state-of-charge V-SOC of EV5
a5be less than the virtual state-of-charge V-SOC of EV4
a4, correspond to EV5 average discharge power and be greater than EV4, result shows that this control algolithm can control electric automobile discharge rate according to user's request.
Control input or the excision of electric automobile place submodule in the present embodiment as follows: if modulation wave signal is greater than carrier signal, the electric automobile submodule corresponding to carrier signal is put into; Otherwise electric automobile place submodule is cut.
Increasing based on the redundancy of the scale electric automobile group system of MMC and reliability by arranging bridge arm unit redundancy submodule quantity in the present embodiment, ensureing the three-phase power balance of system; Redundancy submodule is arranged as follows: obtain bridge arm unit minimum charging inlet number q according to direct-current charging interface of electric automobile voltage and AC system electric pressure by calculating as shown in the formula (2):
In formula (2), U
grepresent the AC grid line voltage magnitude detecting and obtain, U
evrepresent the electric vehicle charge interface rated voltage of setting, m represents modulation degree, and the span of m is 0 ~ 1, can be taken as 0.8; The redundancy arranging bridge arm unit redundancy submodule quantity is 10%, then bridge arm unit submodule quantity x is: x=q × (1+10%).
In the present embodiment, the control mode of H bridge module is:
The modulation wave signal of H bridge module is made to be v
href, then v
href=v
refa-∑ v
ev
Wherein: ∑ v
evfor detecting the voltage sum of all submodules having electric automobile to drop in the bridge arm unit of acquisition; The carrier signal of H bridge module is triangular wave;
If H bridge module modulation wave signal is greater than H bridge module carrier signal, then full control power switch SH1 and full control power switch SH3 conducting in H bridge module, full control power switch SH2 and full control power switch SH4 turns off;
If H bridge module modulation wave signal is less than H module bridge carrier signal, then full control power switch SH2 and full control power switch SH4 conducting in H bridge module, full control power switch SH1 and full control power switch SH3 turns off.
Figure 11 and Figure 12 is under charging and discharging state respectively; the output current wave of AC network side; can find out that three-phase current amplitude, frequency are identical; phase place mutual deviation 120 °; symmetrical during three-phase current; the voltage symmetry of acquiescence bulk power grid, therefore based on the scale electric automobile group system three-phase power balance of MMC.
The present invention is according to each initial state-of-charge SOC
0ij, user sets time of staying t
ijwith expectation state-of-charge SOC
ij, calculate virtual state-of-charge V-SOC
ij, determine according to virtual state-of-charge sequence the carrier wave that each electric automobile is corresponding, realize electric car charge-discharge electric power demand assigned object, meanwhile, ensure the balance of the scale electric automobile group system three-phase power output based on MMC.
Table 1
Table 2
Claims (7)
1. based on the scale electric automobile group system of MMC, it is characterized in that: three facies units are connected to AC electrical network respectively through LC filter, described facies unit is made up of upper and lower two bridge arm units, and described bridge arm unit is composed in series with n identical submodule by a reactor La, a H bridge module, described H bridge module is by four full control power device SH1 with anti-paralleled diode, SH2, SH3, SH4 and capacitor C forms, the collector electrode wherein entirely controlling power device SH1 and full control power device SH2 is connected to DC power anode, the emitter of full control power device SH3 and full control power device SH4 is connected to DC power cathode, full control power device SH1 emitter with entirely control power device SH3 collector electrode and be connected and the plus end of one end as H bridge module being connected to capacitor C, full control power device SH2 emitter with entirely control power device SH4 collector electrode and be connected and the negative terminal of the other end as H bridge module being connected to capacitor C, described H bridge module accepts the drive singal from external equipment with the grid entirely controlling power device, realizes break-make, described submodule is made up of full control power device S1, a S2 and direct-current charging interface of electric automobile with anti-paralleled diode, wherein, the collector electrode of full control power device S1 is connected with the positive pole of direct-current charging interface of electric automobile, the emitter of full control power device S1 is connected as the plus end of submodule with the collector electrode entirely controlling power device S2, the emitter of full control power device S2 is connected as the negative terminal of submodule with the negative pole of direct-current charging interface of electric automobile, the grid of full control power device S1 and S2 accepts external drive signal from external equipment respectively as submodule drive singal, realizes submodule break-make, the external drive signal of described full control power device S1 and S2 is complementary, the working method of described submodule is:
Controlling described full control power device S1 is that conducting, full control power device S2 turn off, and electric automobile is access in bridge arm unit, realizes the input of electric automobile; Controlling described full control power device S1 for turning off, entirely controlling power device S2 is conducting, and electric 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 quantity that electric automobile drops into and excises can be controlled, realize the control to bridge arm unit output voltage; Described submodule drive singal carries out SPWM modulation according to allocation of carriers modulation strategy to each submodule to obtain.
2. the scale electric automobile group system based on MMC according to claim 1, is characterized in that: described submodule drive singal carries out SPWM modulation according to allocation of carriers modulation strategy to each submodule as follows to obtain:
(1) the modulation wave signal v of each bridge arm unit is obtained as follows
refa
To the grid-connected current i of the AC electrical network of described scale electric automobile group system
abcsample, according to Park transformation theory, by the grid-connected current i that sampling obtains
abcbe transformed into the direct axis component under the synchronously rotating reference frame of line voltage vector oriented and quadrature axis component, described direct axis component is active current i
d, described quadrature axis component is reactive current i
q; The azimuth of line voltage is obtained by phase-locked loop pll
by described active current i
dwith reactive current i
qrespectively with the active current set-point i set
drefwith reactive current set-point i
qrefcompare, the difference obtained forms converter output voltage d-axis command value v through pi regulator respectively
drefwith quadrature axis command value v
qref, wherein, active current set-point i
drefobtained by power outer shroud, for realizing unity power factor by reactive current set-point i
qrefbe set to zero; The described scale electric automobile group system based on MMC adopts allocation of carriers modulation strategy to carry out SPWM control, by described voltage d-axis command value v
drefwith quadrature axis command value v
qrefconvert through anti-PARK, obtain the modulation wave signal v of each bridge arm unit
refa;
(2) adopt in described allocation of carriers modulation strategy and produce triangle carrier signal as follows:
Set each bridge arm unit in described scale electric automobile group system and be connected with n platform electric automobile simultaneously; then the corresponding individual stacked triangle carrier signal of n that arranges is followed successively by C1 from bottom to top layer; C2; C3 ..., Cn; the peak-to-peak value of each triangle carrier signal is 1/n; the triangular wave interval 1/n that upper strata is adjacent with lower floor, the SPWM control signal that each triangle carrier signal produces and each electric automobile one_to_one corresponding, for controlling charging and discharging state and the charge-discharge electric power size of corresponding electric automobile.
3. described in claim 1 based on a control method for the scale electric automobile group system of MMC, it is characterized in that: according to the described initial state-of-charge SOC based on the electric automobile in the scale electric automobile group system of MMC of access
0ij, user sets time of staying t
ijand expect state-of-charge SOC
ij, under the charge/discharge state of the described scale electric automobile group system based on MMC, adopt allocation of carriers modulation strategy to realize individual electric motor car charge/discharge difference power alienation control.
4. the control method of the scale electric automobile group system based on MMC according to claim 3, is characterized in that described individual electric motor car discharge power differentiation controls to carry out as follows:
Step 1, EMS by electric automobile, obtain the initial state-of-charge SOC of each electric automobile
0ij, user sets time of staying t
ijwith expectation state-of-charge SOC
ij, the virtual state-of-charge V-SOC obtaining each electric automobile is calculated by formula (1)
ij:
V_SOC
ij＝(SOC
ij-SOC
0ij)/t
ij(1)
Wherein i, j represent the i-th brachium pontis jth platform electric automobile, i.e. SOC
0ij, t
ij, SOC
ijand V-SOC
ijbe expressed as the initial state-of-charge of the i-th brachium pontis jth platform electric automobile respectively, user sets the time of staying, expect state-of-charge and virtual state-of-charge;
Step 2, for the virtual state-of-charge of each electric automobile size timing carry out ascending sort, and set virtual state-of-charge sequence number D1..Dn by described ascending sort, when not having electric automobile to exit with 5 minutes for the time interval timing carry out ascending sort, when having electric automobile and exiting with and carry out ascending sort; Obtain virtual state-of-charge sequence number D1, virtual state-of-charge sequence number D2 ... the virtual state-of-charge sequence of virtual state-of-charge sequence number Dn;
Step 3, when the described scale electric automobile group system based on MMC is in charged state, adjustment produces the triangle carrier signal corresponding to each electric motor car place submodule drive singal as follows:
Be virtual state-of-charge and the triangle carrier signal C1 of D1..Dn by sequence number, C2, C3 ..., Cn one_to_one corresponding;
The control signal produced using triangle carrier signal C1 is as the drive singal with the sequence number electric automobile place submodule that is Dn corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C2 is as the drive singal with the sequence number electric automobile place submodule that is Dn-1 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C3 is as the drive singal with the sequence number electric automobile place submodule that is Dn-2 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal Cn is as the drive singal with the sequence number electric automobile place submodule that is D1 corresponding to virtual state-of-charge;
When the described scale electric automobile group system based on MMC is in discharge condition, adjustment produces the triangle carrier signal corresponding to the submodule drive singal of each electric motor car place as follows:
Be virtual state-of-charge and the triangle carrier signal C1 of D1..Dn by sequence number, C2, C3 ..., Cn one_to_one corresponding,
The control signal produced using triangle carrier signal C1 is as the drive singal with the sequence number electric automobile place submodule that is D1 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C2 is as the drive singal with the sequence number electric automobile place submodule that is D2 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal C3 is as the drive singal with the sequence number electric automobile place submodule that is D3 corresponding to virtual state-of-charge; The control signal produced using triangle carrier signal Cn is as the drive singal with the sequence number electric automobile place submodule that is Dn corresponding to virtual state-of-charge.
5. the control method of the scale electric automobile group system based on MMC according to claim 3, control input or the excision of electric automobile place submodule as follows: if modulation wave signal is greater than carrier signal, the electric automobile submodule corresponding to described carrier signal is put into; Otherwise electric automobile place submodule is cut.
6. the control method of the scale electric automobile group system based on MMC according to claim 3, it is characterized in that: increasing the described redundancy based on the scale electric automobile group system of MMC and reliability by arranging bridge arm unit redundancy submodule quantity, ensureing the three-phase power balance of described system; Described redundancy submodule is arranged as follows: obtain described bridge arm unit minimum charging inlet number q according to direct-current charging interface of electric automobile voltage and AC system electric pressure by calculating as shown in the formula (2):
In formula (2), U
grepresent the AC grid line voltage magnitude detecting and obtain, U
evrepresent the electric vehicle charge interface rated voltage of setting, m represents modulation degree, and the span of m is 0 ~ 1, can be taken as 0.8; The redundancy arranging bridge arm unit redundancy submodule quantity is 10%, then bridge arm unit submodule quantity x is: x=q × (1+10%).
7. the control method of the scale electric automobile group system based on MMC according to claim 3, is characterized in that: the control mode of described H bridge module is:
The modulation wave signal of H bridge module is made to be v
href, then v
href=v
refa-Σ v
ev
Wherein:
for detecting the voltage sum of all submodules having electric automobile to drop in the bridge arm unit of acquisition; The carrier signal of described H bridge module is triangular wave;
If H bridge module modulation wave signal is greater than H bridge module carrier signal, then full control power switch SH1 and full control power switch SH3 conducting in H bridge module, full control power switch SH2 and full control power switch SH4 turns off;
If H bridge module modulation wave signal is less than H module bridge carrier signal, then full control power switch SH2 and full control power switch SH4 conducting in H bridge module, full control power switch SH1 and full control power switch SH3 turns off.
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