CN108599175A - A kind of load virtual synchronous generator system and control method applied to electric automobile charging pile - Google Patents

A kind of load virtual synchronous generator system and control method applied to electric automobile charging pile Download PDF

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Publication number
CN108599175A
CN108599175A CN201711356835.0A CN201711356835A CN108599175A CN 108599175 A CN108599175 A CN 108599175A CN 201711356835 A CN201711356835 A CN 201711356835A CN 108599175 A CN108599175 A CN 108599175A
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China
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charging pile
synchronous generator
control
power
voltage
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阚忠杰
阚啸
李翔
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Xi'an Yi Fei Nuclear Power Equipment Ltd By Share Ltd
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Xi'an Yi Fei Nuclear Power Equipment Ltd By Share Ltd
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Publication of CN108599175A publication Critical patent/CN108599175A/en
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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
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E40/30—Reactive power compensation
    • 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

Abstract

The present invention provides a kind of load virtual synchronous generator system and control method applied to electric automobile charging pile, charging pile uses the two-stage type main circuit topology of the two-way DC/AC of two-way DC/DC+, and virtual synchronous generator control technology is introduced in the two-way DC/AC interfaces of charging pile；Virtual impedance technology is introduced under rotating coordinate system can effectively inhibit the transient state overcurrent under fault case while realizing more charging pile parallel running reactive power equilibrium assignments.One aspect of the present invention makes entire charging pile have inertia/damping, primary frequency modulation and idle voltage regulation function, externally show the external characteristics of virtual synchronous generator, on the other hand can effectively avoid reactive power caused by extensive charging pile cluster can not equilibrium assignment the problem of, help to promote network voltage and frequency stability, access for more extensive charging pile load lays the foundation, method is simple and effective, is conducive to engineer application.

Description

It is a kind of applied to the load virtual synchronous generator system of electric automobile charging pile and control Method processed
Technical field
The invention belongs to electrical engineering fields, and in particular to a kind of load virtual synchronous applied to electric automobile charging pile Generator system and control method.
Background technology
In recent years, China's ev industry obtains sustained and rapid development, and as power load, electric vehicle is not only Power consumption person and electrical energy production person, and its controllability, interactivity and activity are stronger.However extensive electric vehicle without Sequence accesses power grid, and dynamic response characteristic and static power producing characteristics have significant difference with conventional synchronous generator, to power grid Operation stability and abundance generation large effect of powering, are mainly shown as：
1) inhibit the ability of mains frequency disturbance to tend to weaken, easily cause frequency stabilization sex chromosome mosaicism.
2) inhibit the ability of grid disturbances to tend to weaken, easily cause voltage stabilization sex chromosome mosaicism.
Invention content
For the above problem caused by the extensive unordered access power grid of electric vehicle, the present invention is in electric automobile charging pile Introduce virtual synchronous machine control technology, propose a kind of load virtual synchronous generator system applied to electric automobile charging pile and Control method makes it while playing part throttle characteristics, moreover it is possible to play the characteristic of power supply, and participate in mains frequency and voltage tune Section, then can necessarily improve operation of power networks stability.
The solution of the present invention is as follows：
This is applied to the load virtual synchronous generator system of electric automobile charging pile, and charging pile is equivalent to one virtually together Generator is walked, charging pile uses the two-stage type main circuit topology of the two-way DC/AC of two-way DC/DC+；Control system includes：
Governor receives the frequency reference ω of charging pilerefAnd actual value ω, output and the Direct Power introduced After control is superimposed with direct voltage control output, it is supplied to as the mechanical output in synchronous generator rotor equation of motion model Power and frequency control device；
Power and frequency control device, output are synchro angle θ, for carrying out dq rotation transformations to stator voltage, stator current；
Excitation and Reactive-power control device, receive idle reference value QrefAnd the stator voltage reference value of actual value Q and charging pile UrefAnd actual value Ug, export and be supplied to stator electric as the stator voltage reference value in synchronous generator electromechanics equation model Press Closed Loop Control Unit；
Stator voltage Closed Loop Control Unit exports the reference input as stator current Closed Loop Control Unit；
The output of the stator voltage Closed Loop Control Unit generates pwm control signal, and driving power device activity is thus real The control of existing virtual synchronous generator.
Further, in the two-stage type main circuit topology, prime DC/DC is topological using isolated form or non-isolation type, after Grade DC/AC is joined using three level or two level topology with meeting energy in bidirectional flow, the transformation of DC voltage wide scope and charging pile The requirement adjusted with mains frequency and voltage.
For above application in the control method of the load virtual synchronous generator system of electric automobile charging pile, including with Lower step：
1) charging pile operational mode, i.e. direct Power Control pattern or direct voltage control pattern, fortune are selected according to demand Calculation obtains corresponding mechanical output and is supplied to power and frequency control device；
2) it is frequency-domain model by synchronous generator rotor equation of motion model conversion, obtains power and frequency control device, output is Synchro angle θ；
3) excitation is used as d axis built-in potential reference values E with the output of Reactive-power control deviced, q axis built-in potential reference values are set as 0, Dq rotation transformations are carried out to stator voltage, stator current respectively based on the synchro angle θ that power and frequency control device in step 2) exports；
4) virtual resistance R and virtual reactance L, virtual resistance R are introduced for pressing down in stator voltage d, q axis closed-loop control link Overcurrent under transient fault state processed, reactive power equilibrium assignment when virtual reactance L is for realizing more charging pile parallel runnings； Virtual resistance is individually subtracted with reference to built-in potential by d, q axis again and obtains corresponding synchronous generator electromechanics side with pressure drop in virtual reactance D, q axis stator voltage reference value in journey model；
5) closed-loop control is carried out respectively to stator voltage and stator current and generates PWM and driving power device activity, by This realizes the virtual synchronous generator control based on charging pile.
Further specifically, the synchronous generator rotor equation of motion model established is as follows：
The synchronous generator electromechanics equation model of foundation is as follows：
ud=Ed-Rid+ωLiq
uq=Eq-Riq-ωLid
In formula：J is synchronous generator rotary inertia, kgm2；ω、ωgThe respectively electrical angular frequency of synchronous generator and electricity Net angular frequency, rad/s；Pm、PeRespectively synchronous generator machinery, electromagnetic power, kW；D is synchronous generator damped coefficient, N m·s；ud、uqRespectively stator voltage d, q axis component, V；Ed、EqRespectively built-in potential d, q axis components, V；id、iqIt is respectively fixed Electron current d, q axis component, A；R, L is respectively synchronous resistance and synchronous reactance.
Further, the direct Power Control is specifically：Charge-discharge electric power is instructed into P0As mechanical output reference value Pm A part, that is, realize and direct Power Control and participate in electric vehicle charge and discharge control；The direct voltage control is specifically：It is logical It crosses the closed-loop control of introducing DC voltage and outputs it as mechanical output reference value PmA part, so that charging pile is had directly Voltage control function, such as following formula：
Pdc=(Udc_ref-Udc)·PI(s)
In formula：Udc_ref、UdcRespectively direct voltage reference value and actual value, V.
The invention has the advantages that：
Charging pile uses the two-stage type main circuit topology of the two-way DC/AC of two-way DC/DC+, two-way DC/DC interfaces that can realize directly The wide scope of galvanic electricity pressure, high efficiency transformation；Virtual synchronous generator control skill is introduced in the two-way DC/AC interfaces of charging pile Art makes it that can change autonomous decision absorption/delivered power speed according to mains frequency, and has damping characteristic, realizes really meaning Net lotus in justice is friendly interactive.
Charging pile is provided simultaneously with direct Power Control and direct voltage control function, and operational mode is versatile and flexible；It is rotating Introducing virtual impedance technology under coordinate system can be effective while realizing more charging pile parallel running reactive power equilibrium assignments Inhibit the transient state overcurrent under fault case.
Using the program, on the one hand make entire charging pile that there is inertia/damping, primary frequency modulation and idle voltage regulation function, it is right The outer external characteristics for showing virtual synchronous generator, on the other hand can effectively avoid idle work(caused by extensive charging pile cluster Rate can not equilibrium assignment the problem of, help to promote network voltage and frequency stability, for connecing for more extensive charging pile load Enter to lay the foundation, method is simple and effective, is conducive to engineer application.
Description of the drawings
Fig. 1 is two-stage charge stake main circuit topology system block diagram；
Fig. 2 is charging pile virtual synchronous generator overall control block diagram.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings.
It is referred specifically to using the two-stage type main circuit topology of the two-way DC/AC of two-way DC/DC+ referring to Fig. 1：To meet energy simultaneously It measures two-way flow, the transformation of DC voltage wide scope and charging pile and participates in the requirement that mains frequency is adjusted with voltage, prime DC/DC is adopted With isolated form or non-isolation type topology, rear class DC/AC is using three level or conventional two level topology, and normal charge stake energy is only Energy one-way flow, it is very limited to participate in mains frequency regulating power.
Referring to such as Fig. 2, the links of the present invention are illustrated respectively.
Based on charging pile DC/AC interfaces, equation of rotor motion and electromechanical equation model, such as following formula are established respectively：
ud=Ed-Rid+ωLiq(2)
uq=Eq-Riq-ωLid(3)
In formula：J is synchronous generator rotary inertia, kgm2；ω、ωgThe respectively electrical angular frequency of synchronous generator and electricity Net angular frequency, rad/s；Pm、PeRespectively synchronous generator machinery, electromagnetic power, kW；D is synchronous generator damped coefficient, N m·s；ud、uqRespectively stator voltage d, q axis component, V；Ed、EqRespectively built-in potential d, q axis components, V；id、iqIt is respectively fixed Electron current d, q axis component, A；R, L is respectively synchronous resistance and synchronous reactance.
Based on charging pile DC/AC interfaces, introduce respectively governor and field regulator model, in particular to：By charging pile Frequency reference ωrefAnd the deviation of actual value ω exports after proportional controller as governor, as shown in formula (4)；It will charging Stake stator voltage reference value UrefWith actual value UgDeviation after proportional controller as field regulator export, such as formula (5) institute Show.
Pprim=kf(ωref-ω) (4)
In formula：PprimFor power instruction corresponding with governor output, kW；kfFor coefficient of frequency modulation.
EdU=ku(Uref-Ug) (5)
In formula：EdU、UgBuilt-in potential instruction respectively corresponding with field regulator output and network voltage, V；kuFor excitation Adjustment factor.
Do not consider direct Power Control and direct voltage control, governor is exported into PprimAs machine in equation of rotor motion Tool power Pm, then may make up complete charging pile virtual synchronous machine by formula (1)~(5) and control.And governor and adjustment of field excitation The introducing of device so that charging pile is natural to be had droop characteristic and have the ability that mains frequency is adjusted with voltage that participates in.
Based on charging pile DC/AC interfaces, direct Power Control and direct voltage control are introduced respectively, and export with governor PprimSuperposition forms mechanical output instruction.
Charging pile have direct Power Control and direct voltage control function, in particular to：Charge-discharge electric power is instructed into P0 As mechanical output reference value PmA part, you can realize direct Power Control simultaneously participate in electric vehicle charge and discharge control；And It is used as mechanical output reference value P by introducing DC voltage closed-loop control and outputting itmA part, charging pile can be made to have Direct voltage control function, as shown in following formula (6)：
Pdc=(Udc_ref-Udc)·PI(s) (6)
In formula：Udc_ref、UdcRespectively direct voltage reference value and actual value, V.
When charging pile runs on direct Power Control pattern, it is with reference to mechanical output instruction：
Pm=P0+Pprim=P0+kf(ωref-ω) (7)
At this point, charging pile DC/DC interfaces run on DC voltage support modes, corresponding load current instruction is：
Iload_ref=(Udc_ref-Udc)·PI(s) (8)
When charging pile runs on direct voltage control pattern, it is with reference to mechanical output instruction：
Pm=Pdc+Pprim=(Udc_ref-Udc)·PI(s)+kf(ωref-ω) (9)
At this point, charging pile DC/DC interfaces run on constant power mode, corresponding load current instruction is：
Iload_ref=(P0-P)·PI(s) (10)
Based on charging pile DC/AC interfaces, Reactive-power control device is introduced respectively, and export E with field regulatordU, built-in potential base Quasi- value E0Superposition is used as built-in potential reference value Ed, i.e.,：
Ed=E0+EdU+EdQ=E0+ku(Uref-Ug)+(Qref-Q)·PI(s) (11)
The control method of the present invention includes the following steps：
Step 1：Charging pile operational mode is selected according to demand, and direct Power Control can be flexible with direct voltage control pattern Setting, and it regard formula (7) or formula (9) as mechanical output reference value；
Step 2：Formula (1) is converted into frequency-domain model, obtains power and frequency control device, output is synchro angle θ；
Step 3：It is E that d axis built-in potential reference values, which can be obtained, by formula (11)d, q axis built-in potential reference values are set as 0, are based on Power and frequency control device output synchro angle θ carries out dq rotation transformations to stator voltage, stator current respectively in step 2；
Step 4：Virtual resistance R and virtual reactance L is introduced in stator voltage d, q axis closed-loop control link, virtual resistance R's It is idle when the presence of virtual reactance L can be achieved more charging pile parallel runnings in the presence of the overcurrent that can inhibit under transient fault state Power equalization distributes；Virtual resistance is individually subtracted with reference to built-in potential by d, q axis again and can be obtained d, q axis with pressure drop in virtual reactance Stator voltage reference value；
Step 5：Closed-loop control is carried out respectively to stator voltage and stator current and generates PWM and driving power device is dynamic Make, is achieved in the virtual synchronous machine control based on charging pile.
Above example is the example of the present invention, rather than the limitation to the application claim, the technology of this field Personnel can also make various transformation or modification, therefore all equivalent without departing from the spirit and scope of the present invention Technical solution should also belong to scope of the invention.

Claims (5)

1. a kind of load virtual synchronous generator system applied to electric automobile charging pile, it is characterised in that：Charging pile is equivalent For a virtual synchronous generator, charging pile uses the two-stage type main circuit topology of the two-way DC/AC of two-way DC/DC+；Control system Including：
Governor receives the frequency reference ω of charging pilerefAnd actual value ω, output and the direct Power Control introduced After being superimposed with direct voltage control output, work(frequency is supplied to as the mechanical output in synchronous generator rotor equation of motion model Controller；
Power and frequency control device, output are synchro angle θ, for carrying out dq rotation transformations to stator voltage, stator current；
Excitation and Reactive-power control device, receive idle reference value QrefAnd the stator voltage reference value U of actual value Q and charging pileref And actual value Ug, export as the stator voltage reference value in synchronous generator electromechanics equation model and stator voltage be supplied to close Ring control unit；
Stator voltage Closed Loop Control Unit exports the reference input as stator current Closed Loop Control Unit；
The output of the stator voltage Closed Loop Control Unit generates pwm control signal, and driving power device activity is achieved in void The control of quasi- synchronous generator.
2. the load virtual synchronous generator system according to claim 1 applied to electric automobile charging pile, feature It is：In the two-stage type main circuit topology, prime DC/DC uses three using isolated form or non-isolation type topology, rear class DC/AC Level or two level topology, with meet energy in bidirectional flow, DC voltage wide scope transformation and charging pile participate in mains frequency with The requirement that voltage is adjusted.
3. the control method described in claim 1 applied to the load virtual synchronous generator system of electric automobile charging pile, packet Include following steps：
1) charging pile operational mode, i.e. direct Power Control pattern or direct voltage control pattern, operation is selected to obtain according to demand It is supplied to power and frequency control device to corresponding mechanical output；
2) it is frequency-domain model by synchronous generator rotor equation of motion model conversion, obtains power and frequency control device, output is synchronization Angle θ；
3) excitation is used as d axis built-in potential reference values E with the output of Reactive-power control deviced, q axis built-in potential reference values are set as 0, are based on The synchro angle θ that power and frequency control device exports in step 2) carries out dq rotation transformations to stator voltage, stator current respectively；
4) virtual resistance R and virtual reactance L, virtual resistance R are introduced for inhibiting temporary in stator voltage d, q axis closed-loop control link Overcurrent under state fault case, reactive power equilibrium assignment when virtual reactance L is for realizing more charging pile parallel runnings；Again by D, q axis is individually subtracted virtual resistance with reference to built-in potential and obtains corresponding synchronous generator electromechanics equation mould with pressure drop in virtual reactance D, q axis stator voltage reference value in type；
5) closed-loop control is carried out respectively to stator voltage and stator current and generates PWM and driving power device activity, it is thus real The now virtual synchronous generator control based on charging pile.
4. control method according to claim 3, it is characterised in that：
The synchronous generator rotor equation of motion model of foundation is as follows：
The synchronous generator electromechanics equation model of foundation is as follows：
ud=Ed-Rid+ωLiq
uq=Eq-Riq-ωLid
In formula：J is synchronous generator rotary inertia, kgm2；ω、ωgThe respectively electrical angular frequency of synchronous generator and power grid angle Frequency, rad/s；Pm、PeRespectively synchronous generator machinery, electromagnetic power, kW；D is synchronous generator damped coefficient, Nm s；ud、uqRespectively stator voltage d, q axis component, V；Ed、EqRespectively built-in potential d, q axis components, V；id、iqRespectively stator electricity Flow d, q axis component, A；R, L is respectively synchronous resistance and synchronous reactance.
5. control method according to claim 3, it is characterised in that：
The direct Power Control is specifically：Charge-discharge electric power is instructed into P0As mechanical output reference value PmA part, i.e., in fact Existing direct Power Control simultaneously participates in electric vehicle charge and discharge control；
The direct voltage control is specifically：It is used as mechanical output reference by introducing DC voltage closed-loop control and outputting it Value PmA part, so that charging pile is had direct voltage control function, such as following formula：
Pdc=(Udc_ref-Udc)·PI(s)
In formula：Udc_ref、UdcRespectively direct voltage reference value and actual value, V.
CN201711356835.0A 2017-12-16 2017-12-16 A kind of load virtual synchronous generator system and control method applied to electric automobile charging pile Pending CN108599175A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110797866A (en) * 2019-11-06 2020-02-14 国网湖南省电力有限公司 Dynamic path planning method for electric vehicle participating in power grid frequency modulation/voltage regulation
CN111313401A (en) * 2019-12-06 2020-06-19 国网天津市电力公司电力科学研究院 Off-board charging and discharging control system and method based on Hamilton control principle
CN115833266A (en) * 2023-02-14 2023-03-21 中国科学院电工研究所 Aggregation control method for grid-following type converter cluster in new energy power system

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Application publication date: 20180928