CN110137987A - In a kind of micro-grid system virtual synchronous machine and machine control method and micro-grid system - Google Patents
In a kind of micro-grid system virtual synchronous machine and machine control method and micro-grid system Download PDFInfo
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- CN110137987A CN110137987A CN201910371057.5A CN201910371057A CN110137987A CN 110137987 A CN110137987 A CN 110137987A CN 201910371057 A CN201910371057 A CN 201910371057A CN 110137987 A CN110137987 A CN 110137987A
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- virtual synchronous
- synchronous machine
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
In a kind of micro-grid system virtual synchronous machine and machine control method, by set according to the status information for obtaining each energy-storage units each virtual synchronous machine operating mode so that each its energy-storage units of virtual synchronous machine real-time matching operating status, when network voltage does not meet preset Grid-connection standards by selecting one of them according to preset rules as main virtual synchronous machine, remaining is from virtual synchronous machine, control is switched on from virtual synchronous machine off-network after controlling main virtual synchronous machine elder generation's off-network booting, so that each virtual synchronous function normally accesses power grid and load, it is all relatively simple to solve operating mode present in traditional technical solution, it can not real-time matching and in the case where there is multiple virtual synchronous machines with its energy-storage units operating status, it is difficult to adjusting the electrifying timing sequence of each virtual synchronous machine so that its normal access electricity The problem of net and load.
Description
Technical field
The invention belongs in virtual synchronous machine control technology field more particularly to a kind of micro-grid system virtual synchronous machine and
Machine control method and micro-grid system.
Background technique
With the fast development of new energy, the accounting of new energy is being stepped up in power grid, and new energy has interval
The features such as property and fluctuation, and traditional grid type control strategy for inverter fast response time, without rotary inertia can not participate in electricity
Net is adjusted, and is unfavorable for the safe and stable operation of power distribution network and microgrid, and virtual synchronous machine technology is the rotor according to synchronous generator
The equation of motion and excitation voltage equation, which pass through modeling, makes our electronic power convertor have the correlation properties of synchronous generator
To achieve the purpose that support power grid, but operating mode is all relatively more single in practical applications for virtual synchronous machine traditional at present
One, it can not real-time matching and in the case where there is multiple virtual synchronous machines with its energy-storage units operating status, it is difficult to each adjusting
The electrifying timing sequence of a virtual synchronous machine is so that its normal access power grid and load.
Therefore, it is all relatively simple that there are operating modes in traditional technical solution, can not with its energy-storage units operating status
Real-time matching and in the case where there is multiple virtual synchronous machines, it is difficult to adjust the electrifying timing sequence of each virtual synchronous machine so that its
The problem of normal access power grid and load.
Summary of the invention
In view of this, the embodiment of the invention provides in a kind of micro-grid system virtual synchronous machine and machine control method and
Micro-grid system, it is intended to which it is all relatively simple to solve operating mode present in traditional technical solution, runs shape with its energy-storage units
State can not real-time matching and in the case where there is multiple virtual synchronous machines, it is difficult in the electrifying timing sequence for adjusting each virtual synchronous machine
So that the problem of its normal access power grid and load.
The first aspect of the embodiment of the present invention provides virtual synchronous machine in a kind of micro-grid system and machine control method, institute
Stating virtual synchronous machine combining system includes: multiple energy-storage units, and is connected one to one with multiple energy-storage units more
A virtual synchronous machine, and the Intelligent power distribution device being connect respectively with multiple virtual synchronous machines and power grid, the controlling party
Method includes:
The network voltage is obtained, judges whether the network voltage meets preset Grid-connection standards；
If the network voltage meets preset Grid-connection standards, the status information of each energy-storage units and each is obtained
The status information of the virtual synchronous machine；
Each virtual synchronous machine operating mode is set according to the status information of each energy-storage units and grid-connected is opened
Machine；
If the network voltage does not meet preset Grid-connection standards, selected in multiple virtual synchronous machines according to preset rules
Determining one of them is main virtual synchronous machine, remaining is from virtual synchronous machine；
Control is switched on from virtual synchronous machine off-network after controlling main virtual synchronous machine elder generation's off-network booting.
The second aspect of the embodiment of the present invention provides a kind of micro-grid system, including memory, processor and is stored in
In the memory and the computer program that can run on the processor, when the processor executes the computer program
Realize as in above-mentioned micro-grid system virtual synchronous machine and the step of machine control method.
The third aspect of the embodiment of the present invention provides a kind of computer readable storage medium, the computer-readable storage
Media storage has computer program, is realized when the computer program is executed by processor such as virtual synchronous in above-mentioned micro-grid system
Machine and the step of machine control method
In above-mentioned micro-grid system virtual synchronous machine and machine control method, by according to obtaining each energy-storage units
Status information set the operating mode of each virtual synchronous machine so that each its energy storage list of virtual synchronous machine real-time matching
The operating status of member, when network voltage does not meet preset Grid-connection standards by being selected based on one of them according to preset rules
Virtual synchronous machine, remaining is to control after controlling main virtual synchronous machine elder generation's off-network booting from virtual synchronous from virtual synchronous machine
The booting of machine off-network, so that each virtual synchronous function normally accesses power grid and load, solves and exists in traditional technical solution
Operating mode it is all relatively simple, can not real-time matching and in the feelings for having multiple virtual synchronous machines with its energy-storage units operating status
Under condition, it is difficult to adjust the electrifying timing sequence of each virtual synchronous machine so that the problem of its normal access power grid is with load.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram for virtual synchronous machine combining system that first embodiment of the invention provides；
The tool of the output control method of virtual synchronous machine in a kind of micro-grid system that Fig. 2 provides for second embodiment of the invention
Body flow chart；
Fig. 3 is the specific flow chart of step S100 shown in Fig. 2；
Fig. 4 is the specific flow chart of step S300 shown in Fig. 2；
Fig. 5 is the specific flow chart of step S400 shown in Fig. 2；
Fig. 6 is the specific flow chart of step S400 shown in Fig. 2；
Fig. 7 is the schematic diagram for the micro-grid system that one embodiment of the invention provides；
Fig. 8 be in a kind of micro-grid system for providing of third embodiment of the invention virtual synchronous machine and machine control method tool
Body flow chart；
Fig. 9 is the specific flow chart of step S300 shown in Fig. 8；
Figure 10 is the specific flow chart of step S400 shown in Fig. 8；
Figure 11 is the specific flow chart of step S500 shown in Fig. 8；
Figure 12 be in a kind of micro-grid system for providing of third embodiment of the invention virtual synchronous machine and machine control method
Specific flow chart；
The schematic diagram for the micro-grid system that Figure 13 one embodiment of the invention provides；
Virtual synchronous machine and off-network control method in a kind of micro-grid system that Figure 14 provides for the fourth embodiment of the present invention
Specific flow chart；
Figure 15 is the specific flow chart of step S100 shown in Figure 14；
Figure 16 is the specific flow chart of the later step of step S310 shown in Figure 14；
Figure 17 is the specific flow chart of step S400 shown in Figure 14；
Figure 18 is the schematic diagram for the micro-grid system that one embodiment of the invention provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1, the structural schematic diagram for the micro-grid system that first embodiment of the invention provides, for ease of description, only
Part related to the present embodiment is shown, details are as follows:
The micro-grid system that the first embodiment of the present invention provides includes multiple energy-storage units, and with multiple energy-storage units
The multiple virtual synchronous machines to connect one to one, and the Intelligent power distribution device being connect respectively with multiple virtual synchronous machines and power grid
300, and the Centralized Controller 400 being connect with each energy-storage units and each virtual synchronous machine and Intelligent power distribution device 300.
In the present embodiment, multiple energy-storage units include first energy-storage units 110, second energy-storage units 120, third energy storage
Unit 130 and the 4th energy-storage units 140.In other embodiments, multiple energy-storage units can be the storage of any other quantity
It can unit.
In the present embodiment, multiple virtual synchronous machines include the first virtual synchronous machine 210, the second virtual synchronous machine 220, the
Three virtual synchronous machines 230 and the 4th virtual synchronous machine 240, in other embodiments, the quantity of multiple virtual synchronous machines can be with
For any number.Optionally, micro-grid system is also connected with multiple loads, in the present embodiment, illustrates the first load 510 and the
Two loads 520, may include one or 3 and above load in other embodiments.
It should be understood that Centralized Controller 400 and each energy-storage units, each virtual synchronous machine and Intelligent power distribution device communicate
Connection, Centralized Controller 400 acquire the shape of each energy-storage units, each virtual synchronous machine and Intelligent power distribution device 300 in real time
State information and data etc. and each energy-storage units of centralized control, each virtual synchronous machine and Intelligent power distribution device, optionally, collection
Middle controller 400 can pass through RS485, ECAN with each energy-storage units, each virtual synchronous machine and Intelligent power distribution device 300
Or Ethernet etc. is communicated.
It should be noted that Intelligent power distribution device 300 includes multiple switch, opening for micro-grid system is connect with utility grid end
The switch for closing C3, each load connection micro-grid system, such as the switch CI and switch C2 and each virtual synchronous in the present embodiment
The switch at machine and utility grid end and load connection, such as switch K1, switch K2, switch K3 and the switch K4 in the present embodiment
Deng.
Referring to Fig. 2, the second embodiment of the present invention provides a kind of output control of virtual synchronous machine in micro-grid system
Method, comprising:
Step S100: output end voltage parameter and output end current parameter are obtained, and carries out active and idle calculating；
Wherein it is possible to obtain the three-phase voltage and three-phase current of output end by modes such as samplings, then converted by DQ
(Park transformation, Park Transformation), conversion etc. obtain other kinds of voltage and current parameter, such as on d-q axis
Voltage and current, virtual value of voltage and current etc..
Step S200: according to output end current parameter, and virtual resistance R is adjustedaAnd virtual reactance LsMake each virtual synchronous machine
Reach power-sharing；
Wherein, virtual resistance RaAnd virtual reactance LsFor customized parameter, virtual resistance RaAnd virtual reactance LsCan by with
The artificial input in family can also be automatically adjusted by micro-grid system.
Step S300: the output reference voltage E of virtual synchronous machine is obtainedVSGAnd output refers to generator rotor angle θVSG；
Step S400: according to output end voltage parameter, output end current parameter, output reference voltage EVSGAnd output reference
Generator rotor angle θVSGIt establishes Voltage loop and electric current loop and the inner parameter by adjusting Voltage loop and electric current loop makes the voltage of virtual synchronous machine
Output valve is target output value.
Wherein it is possible to first according to output reference voltage EVSGAnd output refers to generator rotor angle θVSGWith virtual synchronous machine output end voltage
Parameter establishes Voltage loop, and the output current value and virtual synchronous machine output end current parameter further according to Voltage loop establish electric current loop.
It should be noted that can be by the Inside Parameter Value of preset fixation, so that virtual synchronous machine only need to be according to reality
Output end voltage parameter, output end current parameter, output reference voltage EVSGAnd output refers to generator rotor angle θVSGIt is defeated to obtain target
It is worth out；Can also by internal preset rule, voluntarily adjusted according to desirable value in real time the inner parameter of Voltage loop and electric current loop with
Make value needed for the output valve micro-grid system of virtual synchronous machine, can also be completed according to the parameter that user inputs to voltage
The output of ring and electric current loop controls.
The output control method of virtual synchronous machine in micro-grid system in the present embodiment, passes through the virtual synchronous according to acquisition
The output end current parameter of machine simultaneously adjusts virtual resistance RaAnd virtual reactance LsEach virtual synchronous machine is set to reach power-sharing, and root
According to the output end voltage parameter, output end current parameter, output reference voltage E of acquisitionVSGAnd output refers to generator rotor angle θVSGEstablish electricity
Pressure ring and electric current loop and the inner parameter by adjusting Voltage loop and electric current loop make the voltage output value target of virtual synchronous machine
Output valve, the output for solving virtual synchronous machine present in traditional technical solution mismatch power grid end data, output shakiness
The problem of determining and being difficult to the problem of adjusting.
Referring to Fig. 3, in a more detailed embodiment, step S100 includes:
Step S110: the three-phase voltage V of output end is obtainedab、Vbc、VcaWith the three-phase current I of output enda、Ib、Ic, and mention
Take corresponding fundamental positive sequence V 'ab、V′bc、V′ca、I′a、I′b、I′c；
It should be noted that the formula of step S110 can be with are as follows:
Wherein N is discretization acquisition points, θk=2 π k/N, k are frequency two-stage system index, and z is transformation complex variable.Ying Li
Solution, discretization acquisition points N can be arranged according to actual acquisition frequency needs, and actual acquisition frequency needs to be setting
Fixed frequency, or variable frequency acquisition.
Step S120: according to fundamental positive sequence V 'ab、V′bc、V′ca、I′a、I′b、I′cCarry out active and idle calculating.
It should be noted that step S120 can be following formula:
Pm=V 'ca×I′c+V′ab×I′b；
Qm=V 'bc×I′a+V′ca×I′b+V′ab×I′c；
In more detailed embodiment, step S200, by adjusting virtual resistance RaAnd virtual reactance LsMake each virtual same
Before the step of step machine reaches power-sharing further include:
By current first harmonics I 'a、I′b、I′cPositive-sequence component shifts to 90 ° of values and obtains dephased current fundamental wave I "a、I″b、I″c:
According to current first harmonics I 'a、I′b、I′c, dephased current fundamental wave I "a、I″b、I″c, virtual resistance RaAnd virtual reactance Ls
Calculate the virtual impedance Z of virtual synchronous machineva、Zvb、Zvc, calculation formula can be with are as follows:
It should be noted that the micro-grid system moment, which is in, judges whether virtual synchronous machine is in the state of power-sharing, when
Detect the power unevenness timesharing of virtual synchronous machine, micro-grid system can voluntarily continue to adjust virtual resistance Ra and virtual reactance Ls
Until virtual synchronous machine is in power-sharing state.Alternatively, when user feels to need to readjust virtual impedance Zva, Zvb, Zvc
When, user can input regulating command, micro-grid system can according to the regulating command that user inputs to virtual impedance Zva, Zvb, Zvc into
Row is adjusted.
The state in real time in adjusting virtual resistance Ra and virtual reactance Ls in the present embodiment, so that virtual same
Step machine is in the state of power-sharing in real time.
In more detailed embodiment, step S300 specifically includes the following steps:
Referring to Fig. 4, inputting secondary pressure regulation reference value U in stator excitation voltage equation, rotor mechanical equationAGC, it is secondary
Chirp reference value ωAGCAnd secondary phase modulation reference value θAGC,The output voltage of virtual synchronous machine is sought with reference to EVSGAnd generator rotor angle reference
θVSG。
It should be noted that if virtual synchronous machine is being incorporated into the power networks, secondary pressure regulation reference value UAGC, frequency modulation frequency modulation reference value
ωAGCAnd secondary phase modulation reference value θAGCWith the parameter phase between virtual synchronous machine and the grid-connected end of its power grid being connect
It closes, secondary pressure regulation reference value U can be sought by specific target component demandAGC, frequency modulation frequency modulation reference value ωAGCAnd it is secondary
Phase modulation reference value θAGCIf virtual synchronous machine is not incorporated into the power networks, virtual synchronous machine can be inputted according to preset parameter value secondary
Pressure regulation reference value UAGC, frequency modulation frequency modulation reference value ωAGCAnd secondary phase modulation reference value θAGC；In the micro-grid system of the present embodiment
In the output control method of virtual synchronous machine, secondary pressure regulation reference value UAGC, frequency modulation frequency modulation reference value ωAGCAnd secondary phase modulation ginseng
Examine value θAGCAcquisition can be communicated by exterior terminal or outside directly inputs acquisition, such as: the first embodiment of the present invention
In, virtual synchronous machine can obtain secondary pressure regulation reference value U by communicating the Centralized Controller of connectionAGC, frequency modulation frequency modulation ginseng
Examine value ωAGCAnd secondary phase modulation reference value θAGC, secondary pressure regulation reference value UAGC, frequency modulation frequency modulation reference value ωAGCAnd it is secondary
Phase modulation reference value θAGCParameter between virtual synchronous machine and the grid-connected end of its power grid connected is related.Such as: if virtual
Synchronous machine is not incorporated into the power networks, and can voluntarily be joined according to set data value to the relevant secondary pressure regulation of virtual synchronous machine input
Examine value UAGC, frequency modulation frequency modulation reference value ωAGCAnd secondary phase modulation reference value θAGC。
It should be understood that virtual synchronous machine can be according to the secondary pressure regulation reference value U of acquisitionAGC, frequency modulation frequency modulation reference value ωAGCWith
And secondary phase modulation reference value θAGCSecondary pressure regulation operation, frequency modulation frequency modulation operation and the operation of secondary phase modulation are carried out, to have secondary
Voltage regulation and frequency modulation ability.
Wherein, the output voltage of virtual synchronous machine is sought with reference to EVSGAnd generator rotor angle refers to θVSGFormula are as follows:
EVSG=E0+ZV+KQ(Qn-Qm)+UAGC；
θVSG=wt+ θAGC。
Control method in the present embodiment passes through the secondary pressure regulation reference value U according to acquisitionAGC, frequency modulation frequency modulation reference value
ωAGCAnd secondary phase modulation reference value θAGCSecondary pressure regulation operation, frequency modulation frequency modulation operation and secondary tune are carried out to virtual synchronous machine
It mutually operates, so that virtual synchronous equipment is for secondary voltage regulation and frequency modulation ability, so that realizing includes the micro- of virtual synchronous machine
Net system has secondary voltage regulation and frequency modulation control strategy function, realizes non differential regulation, keeps the power reliability of system and is adjusted
Property.
Fig. 5 and Fig. 6 are please referred to, in more detailed embodiment, according to output end voltage parameter, output end in step S400
Current parameters, output reference voltage EVSGAnd output refers to generator rotor angle θVSGEstablish Voltage loop and electric current loop the following steps are included:
Step S410: E is referred to output voltageVSGθ is referred to generator rotor angleAGCDQ is carried out to convert to obtain the d-q two-phase of Voltage loop
Reference voltage V*d、V*q。
It should be noted that step S410 is specifically as follows: referring to E to the output voltageVSGIt is referred to the generator rotor angle
θAGCIt is decoupled in d-q coordinate system, to obtain d-q two-phase reference voltage V*d、V*q, i.e., Voltage loop reference voltage is active
Component and reactive component.
Step S420: to the three-phase voltage V of virtual synchronous machine outputab、Vbc、VcaIt converts to obtain d-q two-phase voltage by DQ
Vd、Vq。
It should be noted that step S420 is specifically as follows: to the three-phase voltage V of virtual synchronous machine outputab、Vbc、Vca?
It is decoupled in d-q coordinate system, to obtain d-q two-phase voltage Vd、Vq, i.e. the active component and reactive component of voltage loop voltag.
Step S430: according to V*d、V*qAnd Vd、VqThe Voltage loop based on PI+ Repetitive controller is established, Voltage loop exports d-q two
Mutually refer to voltage and current I*d、I*q:
Step S440: according to the output current reference I* of Voltage loopd、I*q, to the three of the output end of virtual synchronous machine output
Phase current Ia、Ib、IcIt converts to obtain the d-q biphase current I of electric current loop by DQd、Iq。
Step S450: according to the output current reference I* of Voltage loopd、I*qWith the reference I of electric current loopd、IqIt establishes and is based on PI
The electric current loop of control, the output voltage V of electric current loopmd、Vmq。
Step S460: to the output voltage V of electric current loopmd、VmqIt carries out DQ inverse transformation and is obtained by third-harmonic zero-sequence voltage method
The target output voltage V of virtual synchronous machinema、Vmb、Vmc。
In the present embodiment, by the parameter k for adjusting Voltage loop and electric current looppAnd kiIt can get target output voltage, be suitable for
The output of virtual synchronous machine in any micro-grid system is adjusted, and the output of virtual synchronous machine can be made to match power grid end parameter
And the parameter at energy-storage units end.
Fig. 7 is the schematic diagram for the micro-grid system that one embodiment of the invention provides.As shown in fig. 7, Fig. 7 of the embodiment is this
The schematic diagram of the micro-grid system of embodiment offer is provided.As shown in fig. 7, the micro-grid system 10 of the embodiment includes: processor
100, memory 101 and it is stored in the computer program 102 that can be run in memory 101 and on processor 100, such as micro-
The output control method program of virtual synchronous machine in net system.Processor 100 is realized above-mentioned each when executing computer program 102
Step in micro-grid system in the embodiment of the output control method of virtual synchronous machine, such as step S100 shown in Fig. 2 is extremely
S400。
Illustratively, computer program 102 can be divided into one or more module/units, one or more mould
Block/unit is stored in memory 101, and is executed by processor 100, to complete the present invention.One or more module/units
It can be the series of computation machine program instruction section that can complete specific function, the instruction segment is for describing computer program 102
Implementation procedure in micro-grid system 10.For example, computer program 102 can be divided into synchronization module, summarizing module, acquisition
Module, return module (module in virtual bench), each module concrete function are as follows:
Micro-grid system 10 can be computer, central processing unit.Micro-grid system may include, but be not limited only to, processor 100,
Memory 101.It will be understood by those skilled in the art that Fig. 7 is only the example of micro-grid system 10, do not constitute to micro-grid system
10 restriction may include components more more or fewer than diagram, perhaps combine certain components or different components, such as
Micro-grid system can also include input-output equipment, network access equipment, bus etc..
Alleged processor 100 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
Memory 101 can be the internal storage unit of micro-grid system 10, such as the hard disk or memory of micro-grid system 10.It deposits
Reservoir 101 is also possible to the plug-in type hard disk being equipped on the External memory equipment of micro-grid system 10, such as micro-grid system 10, intelligence
Storage card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash card (Flash Card)
Deng.Further, memory 101 can also both including micro-grid system 10 internal storage unit and also including External memory equipment.
Memory 101 is for storing other programs and data needed for computer program and micro-grid system.Memory 101 can also be used
In temporarily storing the data that has exported or will export.
Referring to Fig. 8, the third embodiment of the present invention provides virtual synchronous machine in a kind of micro-grid system and machine controls
Method, control method include:
Step S100: network voltage is obtained, judges whether network voltage meets preset Grid-connection standards.
Network voltage is obtained it should be noted that obtaining terminal and can communicate by wireless or wired mode, such as
In first embodiment of the invention, the main body of acquisition is Centralized Controller, and Centralized Controller obtains power grid electricity by way of communication
It presses and to the network voltage of acquisition compared with preset Grid-connection standards, Grid-connection standards are acceptable grid-connected in practical micro-grid system
Voltage range values.
Step S200: if network voltage meets preset Grid-connection standards, the status information of each energy-storage units and each is obtained
The status information of a virtual synchronous machine.
It should be noted that the status information of each energy-storage units includes but is not limited to voltage, electric current, fault alarm shape
The information such as state, capacity；The status information of each virtual synchronous machine includes but is not limited to voltage, electric current, frequency, fault alarm shape
The information such as state.
Step S300: each virtual synchronous machine operating mode is set according to the status information of each energy-storage units and grid-connected is opened
Machine.
It should be noted that can be to need to be charged or discharged to set each virtual synchronous according to each energy-storage units
Machine is in synchronous generator mode or synchronous motor mode.
Step S400: if network voltage does not meet preset Grid-connection standards, in multiple virtual synchronous machines according to preset rules
One of them is selected as main virtual synchronous machine, remaining is from virtual synchronous machine.
Step S500: control is switched on from virtual synchronous machine off-network after controlling the booting of main virtual synchronous machine elder generation's off-network.
In micro-grid system in this implementation virtual synchronous machine and machine control method, by according to obtaining each energy-storage units
Status information set the operating mode of each virtual synchronous machine so that each its energy-storage units of virtual synchronous machine real-time matching
Operating status, it is virtual based on one of them by being selected according to preset rules when network voltage does not meet preset Grid-connection standards
Synchronous machine, remaining is to control to control after main virtual synchronous machine elder generation's off-network is switched on and open from virtual synchronous machine off-network from virtual synchronous machine
Machine solves Working mould present in traditional technical solution so that each virtual synchronous function normally accesses power grid and load
Formula is all relatively simple, with its energy-storage units operating status can not real-time matching and in the case where there is multiple virtual synchronous machines, it is difficult
To adjust the electrifying timing sequence of each virtual synchronous machine so that the problem of its normal access power grid is with load.
Referring to Fig. 9, being specifically included in step S300 in more detailed embodiment:
Step S310: it is determined according to the status information of each energy-storage units and the status information of each virtual synchronous machine current
The virtual synchronous machine of unfaulty conditions, and determine that each energy-storage units needs are charged or discharged.
It should be understood that each virtual synchronous machine and energy-storage units have a unique identification, micro-grid system leads to each of acquisition
After the status information of energy-storage units and virtual synchronous machine determines the virtual synchronous machine of unfaulty conditions, record can be corresponded, and
And fault message feedback into the virtual synchronous machine of corresponding failure, after the virtual synchronous machine of the failure receives feedback information
Carry out fault alarm.Micro-grid system can also feed back fault message on the terminal device to the maintenance personnel communicated with micro-grid system
In.
Step S320: according to the charge-discharge power demand of each energy-storage units to the virtual synchronous machine being connect with each energy-storage units
Send value and power reference.
Wherein, step S320 is specifically included:
When energy-storage units are in charge requirement, negative power reference value is sent to the virtual synchronous connecting with energy-storage units
Machine.
It should be noted that virtual synchronous machine, which works in, synchronizes electricity after virtual synchronous machine receives negative power reference value
Motivation mode.
When energy-storage units are in electric discharge demand, positive reference value is sent to the virtual synchronous connecting with energy-storage units
Machine.
It should be noted that virtual synchronous machine works in synchronous hair after virtual synchronous machine receives positive reference value
Motor mode.
Step S330: the grid-connected booting of each virtual synchronous machine is controlled according to value and power reference.
It should be noted that grid-connected booting refers to being switched on after virtual synchronous machine is connect with power grid, such as of the invention
In first embodiment, it is assumed that the grid-connected booting of the first virtual synchronous machine then refers to first control switch K1 and C1 closure, is opening the
One virtual synchronous machine.
Referring to Fig. 10, step S400 is specifically included in a more detailed embodiment:
Step S410: the status information of each energy-storage units and the status information of each virtual synchronous machine are acquired.
It should be understood that the status information of energy-storage units includes but is not limited to voltage parameter, current parameters, power parameter, failure
Alarm condition, operation information, electric discharge or charge requirement etc.；The status information of virtual synchronous machine includes but is not limited to voltage ginseng
Number, current parameters, power parameter, fault-alarming state, operation information, operating mode etc..
Step S420: it is determined according to the status information of each energy-storage units and the status information of each virtual synchronous machine current
The virtual synchronous machine of unfaulty conditions, and determine whether each energy-storage units meet electric discharge demand.
The energy-storage units that step S430: determining unfaulty conditions and is connected meet the virtual synchronous board of electric discharge demand
Number N*.
Step S440: the communication id of N* platform virtual synchronous machine is ranked up.
It should be noted that can independently be set to the sequence of communication id, such as can be arranged with number, letter etc.
Sequence.
Step S450: a wherein virtual synchronous machine is arranged as main virtual synchronous machine according to communication id, remaining is virtual
Synchronous machine is set as from virtual synchronous machine.
Wherein it is possible to be arranged the smallest virtual synchronous machine of communication id for main virtual synchronous machine, remaining virtual synchronous machine
It is set as from virtual synchronous machine.
It, can also be maximum by communication id or the communication id that is arbitrarily designated it should be noted that in other embodiments
Virtual synchronous machine is arranged as main virtual synchronous machine, remaining virtual synchronous machine is set as from virtual synchronous machine.
Figure 11 is please referred to, in a more detailed embodiment, step S500 is specifically included:
Step S510: broadcast transmission power-on instruction to main virtual synchronous machine.
It should be noted that main virtual synchronous machine is switched on after receiving power-on instruction, and feeds back booting and complete signal
To the centralized control end of micro-grid system, if the centralized control end of micro-grid system is not received by instead in preset time interval
Signal is completed in the booting of feedback, then sends starting-up signal again to main virtual synchronous machine, until receiving opening for virtual synchronous machine feedback
Machine completes signal.
Step S520: judge whether electric to provide simultaneously machine output from virtual synchronous machine after main virtual synchronous machine off-network is switched on
Pressure, if so, broadcast transmission waits for power-on instruction to from virtual synchronous machine.
It should be noted that can be by whether the booting for receiving the feedback of main virtual synchronous machine be completed signal or is passed through
Detect the status information or the closed state by adhering to the corresponding switch of main virtual synchronous machine or logical of main virtual synchronous machine
User is crossed artificially to input first to judge main virtual synchronous machine whether after off-network booting, then the output by obtaining main virtual synchronous machine
Parameter judges whether main virtual synchronous machine can be for from virtual synchronous to judge whether main virtual synchronous machine can be provided out voltage
Machine provides and machine output voltage.
Step S530: judging whether meet booting voltage from virtual synchronous machine outlet side voltage, if so, sending power-on instruction
To from virtual synchronous machine.
It should be noted that can by obtain from output parameter information of virtual synchronous machine etc. or artificial judgement etc. come
Judge whether meet booting voltage from virtual synchronous machine outlet side voltage, wherein can also survey from the output of virtual synchronous machine
Sampling module is set to obtain its output parameter.
Figure 12 is please referred to, in a more detailed embodiment, after step S500 further include:
Step S600: the virtual synchronous board number N being currently under off-grid operation state is obtained.
It should be noted that each virtual synchronous machine and switch corresponding with virtual synchronous machine have a unique identification,
It can voluntarily be fed back by the status information of acquisition virtual synchronous machine and/or the status information of switch or by virtual synchronous machine
Status information to judge virtual synchronous and whether in off-grid operation state, be currently under off-grid operation state to obtain
Virtual synchronous board number.
Step S700: the first load access for obtaining the gross rated capacity Sn, current micro-grid system of N platform virtual synchronous machine is held
Measure the load of SL1 and second access capacity SL2.
It should be noted that the gross rated capacity Sn for obtaining N platform virtual synchronous machine can be respectively, first acquisition N platform is virtually same
The capability value of each virtual synchronous machine in step machine, then the capability value addition of each virtual synchronous machine is virtually same to obtain N platform
The gross rated capacity Sn of step machine.
It should be noted that after each capability value or the voltage parameter and current parameters that pass through acquisition can be directly acquired
Calculating its corresponding capability value.
The gross rated capacity Sn of step S800: more each virtual synchronous machine, the first of current system load access capacity
The amount of capacity of the load of SL1 and second access capacity SL2.
It should be noted that can first more each virtual synchronous machine gross rated capacity Sn value with first load access
The summation of the load of capacity SL1 and second access capacity SL2, if the value of the gross rated capacity Sn of each virtual synchronous machine is less than first
The summation of the load of access capacity SL1 and second access capacity SL2 is loaded, then the gross rated capacity of more each virtual synchronous machine again
The load of Sn and first access capacity SL1.
Step S900: according to the first load of comparison result closure and/or the connection of the second load and virtual synchronous machine.
In a more detailed embodiment, step S900 includes:
When the gross rated capacity Sn of virtual synchronous machine is not less than the first load access capacity SL1 and the second load access capacity
When the summation of SL2, control instruction or signal are sent to Intelligent power distribution device and controls the first of its closure the first load access system
The second switch of switch and the second load access system.
When virtual synchronous machine gross rated capacity Sn not less than first load access capacity SL1 and virtual synchronous machine it is total
When the summation of the access capacity SL2 for the load of access capacity SL1 and second that rated capacity Sn is loaded less than first, sends control and refers to
It enables or signal controls the first switch that its closure first loads access system to Intelligent power distribution device.
It should be understood that in the present embodiment, the first load can be understood as the highest load of important level.
Method in the present embodiment, by the gross rated capacity Sn, current micro- for obtaining and comparing N platform virtual synchronous machine in real time
First load access capacity SL1 of net system and the second load access capacity SL2, to control closure the first load access system
First switch and second load access system second switch, realize micro-grid system to load especially important load hold
Continuous power supply.
Figure 13 is the schematic diagram for the micro-grid system that one embodiment of the invention provides.As shown in figure 13, the microgrid of the embodiment
System 20 includes: processor 200, memory 201 and is stored in the meter that can be run in memory 201 and on processor 200
Calculation machine program 202, such as the static initial angle positioning method program of motor.Processor 200 is realized when executing computer program 202
Step virtual synchronous machine and in machine control method embodiment in micro-grid system is stated, such as step S200 shown in Fig. 8 is extremely
S500.Alternatively, processor 200 realizes the function of each module/unit in above-mentioned each Installation practice when executing computer program 202
Can, such as module/unit function shown in Fig. 8.
Illustratively, computer program 202 can be divided into one or more module/units, one or more mould
Block/unit is stored in memory 201, and is executed by processor 200, to complete the present invention.One or more module/units
It can be the series of computation machine program instruction section that can complete specific function, the instruction segment is for describing computer program 202
Implementation procedure in micro-grid system 20.For example, computer program 202 can be divided into synchronization module, summarizing module, acquisition
Module, return module (module in virtual bench), each module concrete function are as follows:
Micro-grid system 20 can be the Centralized Controller in first embodiment of the invention.Micro-grid system may include, but not only
It is limited to, processor 200, memory 201.It will be understood by those skilled in the art that Figure 13 is only the example of micro-grid system 20, and
Do not constitute the restriction to micro-grid system 20, may include than illustrating more or fewer components, perhaps combine certain components or
Different components, such as micro-grid system can also include input-output equipment, network access equipment, bus etc..
Alleged processor 200 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
Memory 201 can be the internal storage unit of micro-grid system 20, such as the hard disk or memory of micro-grid system 20.It deposits
Reservoir 201 is also possible to the plug-in type hard disk being equipped on the External memory equipment of micro-grid system 20, such as micro-grid system 20, intelligence
Storage card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash card (Flash Card)
Deng.Further, memory 201 can also both including micro-grid system 20 internal storage unit and also including External memory equipment.
Memory 201 is for storing other programs and data needed for computer program and micro-grid system.Memory 201 can also be used
In temporarily storing the data that has exported or will export.
Please refer to Figure 14, the fourth embodiment of the present invention provides virtual synchronous machine and off-network control in a kind of micro-grid system
Method, for ease of description, only the parts related to this embodiment are shown, and details are as follows for specific steps:
Step S100: virtual synchronous machine output voltage parameter in utility grid voltage parameter and micro-grid system is obtained；
Wherein, the utility grid voltage parameter of acquisition is specifically as follows voltage, electric current, frequency, phase of power grid etc.；It obtains
Virtual synchronous machine output voltage parameter can be voltage, electric current, frequency, the phase etc. of virtual synchronous machine output；Micro-grid system
For using virtual synchronous machine as the micro power network system of core, wherein may include virtual synchronous machine, connecting with virtual synchronous machine
Energy-storage units, virtual synchronous machine and power grid and the multiple groups switch of load connection etc..
Step S200: judging whether the virtual synchronous machine needs to carry out simultaneously off-network handover operation, when virtual synchronous machine needs
It wants off-network then to generate off-network operational order when operating, net operation instruction is then generated when virtual synchronous machine needs simultaneously net operation；
It should be noted that off-network operational order is switched to off-network by grid-connected for controlling virtual synchronous machine.And net operation
Direct current for control virtual synchronous machine switched by off-network it is grid-connected.
Step S300: when virtual synchronous machine needs off-network to operate, then it is off-grid needs to be disconnected according to off-network operational order
The switch of virtual synchronous machine connection power grid；
In order to make it easy to understand, assuming that virtual synchronous machine is in the virtual synchronous machine in the first embodiment of the present invention and machine system
It when system, with reference to Fig. 1, requires to disconnect with power grid if it is all virtual synchronous machines, such as causes in power grid failure
When abnormal conditions occur in its frequency and voltage, switch C3 can be directly disconnected, if it is because a certain virtual synchronous machine is asked
Topic can then disconnect the corresponding switch of virtual synchronous machine of failure when only need to disconnect the virtual synchronous machine of failure, than
What it is such as failure is the first virtual synchronous machine, then can only disconnect switch K1.
Step S400: when virtual synchronous machine needs simultaneously net operation, then virtual same according to grid-connected operational order control is generated
Step machine is adjusted output end voltage parameter to match network voltage parameter, and closure needs are grid-connected thereafter, parameter is matched
Virtual synchronous machine connects the switch into power grid.
In order to make it easy to understand, assuming that virtual synchronous machine is in the virtual synchronous machine in the first embodiment of the present invention and machine system
It is only to need closure switch C3 under normal circumstances with reference to Fig. 1 when system, switch K1 to K4 keeps original state, but if there is one
Virtual synchronous machine after solving with its failure, if the virtual synchronous machine also needs to access, is then closed it due to failure and after disconnecting
Corresponding switch, for example restore again after breaking down and need again grid-connected to be the first virtual synchronous machine, then it can also need to be closed
Switch K1.
It should be noted that can be by carrying out a voltage regulation and frequency modulation and/or secondary voltage regulation and frequency modulation tune to virtual synchronous machine
It is equal to be operated such that virtual synchronous machine output end voltage parameter matches network voltage parameter.
Optionally, close command signal is sent to be closed after total connection switch further include:
Step S500: the case where load is accessed in the system that virtual synchronous machine is currently at is obtained；Important when system is born
When carrying grid-connected and secondary load disconnection, sends close command and control secondary load access system.
Generation off-network operational order in step s 200 includes the following contents:
When virtual synchronous machine is in grid connection state, sentenced according to network voltage parameter and virtual synchronous machine output voltage parameter
Whether disconnected virtual synchronous machine is grid-connected in abnormality, if so, generating active off-network operational order；
It should be noted that network voltage parameter include but is not limited to the three-phase voltage of power grid, effective voltage etc. and
The parameters such as the frequency sought according to power grid power grid；Virtual synchronous machine output voltage parameter includes but is not limited to virtual synchronous
Three-phase voltage, effective voltage of machine output etc. and the parameters such as the frequency sought according to power grid power grid.
When virtual synchronous machine is in grid connection state, and externally input switching off-network instruction is received, then it is passive to generate
Off-network operational order.
The grid-connected operational order of generation in step s 200 includes the following contents:
When virtual synchronous machine is in grid connection state, sentenced according to network voltage parameter and virtual synchronous machine output voltage parameter
Breaking, virtual synchronous machine is grid-connected to be restored to normal condition by abnormality, if so, generating actively grid-connected operational order；
When virtual synchronous machine is in off-network state, and the externally input grid-connected instruction of switching is received, then it is passive to generate
Grid-connected operational order.
Virtual synchronous machine and off-network control method in the present embodiment, by obtaining utility grid voltage parameter and microgrid system
Whether the modes such as virtual synchronous machine output voltage parameter real-time judge virtual synchronous machine needs to carry out simultaneously off-network handover operation in system,
When generating off-network operational order rapid off-network and when generating grid-connected operational order control virtual synchronous machine adjust its parameter
It is grid-connected after being matched with electrical network parameter, realize virtual synchronous machine securely, seamlessly and smoothly and off-network handoff procedure, solve pass
Virtual synchronous machine present in the technical solution of system can not be applicable in microgrid the method for operation, and off-network handoff procedure in can not do
To seamless switching, so as to cause the charge requirement of charge output and actual loading in micro-grid system locating for virtual synchronous machine
It is not reciprocity, after being unable to maintain that the continued power of important load and breaking down cannot timely off-network the problem of.
Figure 15 is please referred to, in a more detailed embodiment, obtains network voltage parameter and virtual in the step s 100
Synchronous machine output voltage parameter includes:
S110: the three-phase voltage V at acquisition power grid endgab、Vgbc、VgcaWith the three-phase voltage V of virtual synchronous machine output endab、
Vbc、Vca。
It should be noted that by power grid and virtual synchronous machine can directly feed back its information collection or by power grid
Side and virtual synchronous machine output end are set up the modes such as sampling module and are acquired, herein without limitation.
S120: to the three-phase voltage V at power grid endgab、Vgbc、VgcaCarry out the angular frequency w that locking phase obtains power grid endgAnd phase
θg。
It should be understood that the locking phase in the present embodiment can be realized by establishing phaselocked loop, the three of power grid end is specially utilized
Phase voltage Vgab、Vgbc、VgcaControl and the frequency and phase for obtaining cycle of phase-locked loop internal oscillation signal, the i.e. angular frequency at power grid end
Rate wgAnd phase thetag, wherein phaselocked loop can be made of phase discriminator, loop filter and voltage controlled oscillator etc..
S130: to the three-phase voltage V of virtual synchronous machine output endab、Vbc、VcaCarry out the angle that locking phase obtains virtual synchronous machine
Frequency w and phase theta.
It should be understood that the locking phase in the present embodiment can be realized by establishing phaselocked loop, virtual synchronous machine is specially utilized
The three-phase voltage V of output endab、Vbc、VcaControl and the frequency and phase for obtaining cycle of phase-locked loop internal oscillation signal, that is, obtain
The angular frequency w and phase theta of virtual synchronous machine, wherein phaselocked loop can be by groups such as phase discriminator, loop filter and voltage controlled oscillators
At.
It should be noted that each step S120 and step S130 may be performed simultaneously in above-described embodiment, it can also be by suitable
Sequence or opposite sequence execute, and the execution sequence of each process should be determined by its function and internal logic, and implement without coping with the present invention
The implementation process of example constitutes any restriction.
16 are please referred to, in one embodiment, further comprising the steps of after step S300:
Step S310: the virtual synchronous board number N being currently under operating status is obtained.
It should be noted that obtaining terminal can obtain by communication networks such as RS485, ECAN or Ethernets or wirelessly
Take the status information of virtual synchronous machine.For example, obtaining, terminal and virtual synchronous machine are all interior to be equipped with communication module, then obtaining terminal can
To obtain the information of virtual synchronous machine in real time by communication module, to obtain the virtual synchronous machine being currently under operating status
Number of units N.
Step S320: the first load access for obtaining the gross rated capacity Sn, current micro-grid system of N platform virtual synchronous machine is held
Measure the load of SL1 and second access capacity SL2.
It should be noted that for the ease of being loaded for example, only listing the first load and second in the present embodiment,
It is not limited to this method and is adapted only to micro-grid system only there are two access is loaded, for example, in other embodiments, can also obtain
Third loads access capacity SL3.
It should be noted that the gross rated capacity Sn for obtaining N platform virtual synchronous machine can be respectively, first acquisition N platform is virtually same
The capability value of each virtual synchronous machine in step machine, then the capability value addition of each virtual synchronous machine is virtually same to obtain N platform
The gross rated capacity Sn of step machine.
It should be noted that after each capability value or the voltage parameter and current parameters that pass through acquisition can be directly acquired
Calculating its corresponding capability value.
It should be understood that the important level of the first load in the present embodiment is higher than the second load.
The gross rated capacity Sn of step S330: more each virtual synchronous machine, the first of current system load access capacity
The amount of capacity of the load of SL1 and second access capacity SL2.
It should be noted that can first more each virtual synchronous machine gross rated capacity Sn whether less than first load connect
Enter capacity SL1, if not, whether the gross rated capacity Sn of more each virtual synchronous machine is less than the first load access capacity again
The load access capacity SL2 summation of SL1 and second.
Step S340: the connection of the first load and/or the second load and virtual synchronous machine is disconnected according to comparison result.
In more detailed embodiment, step S340 is specifically included:
Step S341: when the gross rated capacity Sn of N platform virtual synchronous machine is less than the first load access capacity SL1, transmission control
System instruction disconnects the first load and the second load.
Step S342: when N platform virtual synchronous machine gross rated capacity Sn be greater than first load access capacity SL1 and N it is virtual
When the gross rated capacity Sn of synchronous machine is less than the first load access capacity SL1 and the second load access capacity SL2 summation, control is sent
System instruction disconnects the second load.
It should be noted that because the important level of the first load in the present embodiment is higher than the second load, it is preferential
Power supply to the first load.
Method in the present embodiment, by the gross rated capacity Sn, current micro- for obtaining and comparing N platform virtual synchronous machine in real time
First load access capacity SL1 of net system and the second load access capacity SL2, to control whether the first load access system
First switch and second load access system second switch, realize the stability of power supply of the micro-grid system to load,
The stability to important load supplying is kept as far as possible, avoids leading to load unbalanced always bring seriously because of power supply capacity deficiency
Consequence.
17 are please referred to, in one embodiment, virtual synchronous is controlled according to the grid-connected operational order of generation in step S400
Machine is adjusted output end voltage parameter to match network voltage parameter and specifically include step:
Step S410: secondary pressure regulation reference value U is obtainedAGC, frequency modulation frequency modulation reference value wAGCAnd secondary phase modulation reference value θ
AGC。
It should be noted that the secondary pressure regulation reference value U of the corresponding states in history can be directly acquiredAGC, frequency modulation frequency modulation
Reference value wAGCAnd secondary phase modulation reference value θAGCOr obtain preset secondary pressure regulation reference value UAGC, frequency modulation frequency modulation reference value
wAGCAnd secondary phase modulation reference value θAGCOr obtain the secondary pressure regulation reference value U that user directly inputsAGC, frequency modulation frequency modulation reference
Value wAGCAnd secondary phase modulation reference value θAGCOr the output parameter by the output parameter and virtual synchronous machine that obtain power grid end
To obtain.
Step S420: secondary pressure regulation reference value U is sentAGCWith pressure regulation operational order to virtual synchronous machine.
It should be noted that can be sent by way of cable network or wireless network, and when preset
Between be spaced in detection virtual synchronous machine start carry out pressure regulation operation, if it is not, then sending secondary pressure regulation reference value U againAGCAnd pressure regulation
Operational order is to virtual synchronous machine.
Step S430: when the error of power grid end voltage and virtual synchronous machine output end voltage is less than preset first threshold values
When, it sends and stops pressure regulation operational order to virtual synchronous machine.
It should be noted that preset first threshold values can be arbitrarily arranged, generally micro-grid system locating for virtual synchronous machine
Institute can received worst error value.
Step S440: frequency modulation frequency modulation reference value w is sentAGCWith frequency modulation operational order to virtual synchronous machine.
Step S450: when the error of power grid end voltage and virtual synchronous machine output end frequency is less than preset second threshold values
When, it sends and stops frequency modulation operational order to virtual synchronous machine.
It should be noted that preset second threshold values can be any setting, generally microgrid locating for virtual synchronous machine
System institute can received worst error value.
Step S460: secondary phase modulation reference value θ is sentAGCWith phase modulation operational order to virtual synchronous machine.
Step S470: when the error of power grid end voltage and virtual synchronous machine output end phase is less than preset third threshold values
When, it sends and stops phase modulation operational order to virtual synchronous machine.
It should be noted that preset third threshold values can be any setting, generally system locating for virtual synchronous machine
Institute can received worst error value.
Method in the present embodiment successively carries out pressure regulation operation, frequency modulation operation and phase modulation by controlling virtual synchronous machine
Operation, so that virtual synchronous machine be made to can adapt to the real-time change of voltage, frequency and phase of micro-grid system etc., maintains microgrid
The power reliability of system.
In a more detailed embodiment, step S410 specifically includes the following steps:
Step S411: to the three-phase voltage V at power grid end collectedgab、Vgbc、VgcaDQ is carried out to convert to obtain power grid end
Two-phase rotating coordinate system voltage value Vgd、Vgq。
Step S412: to the three-phase voltage V of virtual synchronous machine output endab、Vbc、VcaDQ is carried out to convert to obtain virtual synchronous
The two-phase rotating coordinate system voltage value V of machined、Vq。
It can be with are as follows: in dq reference axis to the three-phase voltage V of virtual synchronous machine output endab、Vbc、VcaDecouple obtaining
To the two-phase rotating coordinate system voltage value V of virtual synchronous machined、Vq, i.e. the active component of virtual synchronous machine output voltage and idle point
Amount.
Step S413: according to VgdAnd VdCalculate secondary pressure regulation reference value UAGC, specially following formula:
It should be noted that kpAnd kiIt, can be according in different loads, power grid and energy-storage units etc. for customized parameter
Hold variation.
Step S414: according to wgFrequency modulation frequency modulation reference value w is calculated with wAGC, specially following formula:
It should be noted that kpAnd kiIt, can be according in different loads, power grid and energy-storage units etc. for customized parameter
Hold variation.
Step S415: according to θgSecondary phase modulation reference value θ is calculated with θAGC, specially following formula:
Wherein: kPFor proportionality coefficient, kiFor integral coefficient.
It should be noted that kpAnd kiIt, can be according in different loads, power grid and energy-storage units etc. for customized parameter
Hold variation.
Figure 18 is the schematic diagram for the micro-grid system that one embodiment of the invention provides.As shown in figure 18, Figure 18 of the embodiment
It is the schematic diagram for the micro-grid system that one embodiment of the invention provides.As shown in figure 18, the micro-grid system 30 of the embodiment includes: place
It manages device 300, memory 301 and is stored in the computer program 302 that can be run in memory 301 and on processor 300, example
Such as the output control method program of virtual synchronous machine in micro-grid system.Processor 300 is realized above-mentioned when executing computer program 302
Step in the embodiment of each virtual synchronous machine and off-network control method, such as step S300 to S400 shown in Figure 14.
Illustratively, computer program 302 can be divided into one or more module/units, one or more mould
Block/unit is stored in memory 301, and is executed by processor 300, to complete the present invention.One or more module/units
It can be the series of computation machine program instruction section that can complete specific function, the instruction segment is for describing computer program 302
Implementation procedure in micro-grid system 30.For example, computer program 302 can be divided into synchronization module, summarizing module, acquisition
Module, return module (module in virtual bench), each module concrete function are as follows:
Micro-grid system 30 can be the Centralized Controller in computer, central processing unit or first embodiment of the invention.It is micro-
Net system may include, but be not limited only to, processor 300, memory 301.It will be understood by those skilled in the art that Figure 18 is only
The example of micro-grid system 30 does not constitute the restriction to micro-grid system 30, may include components more more or fewer than diagram, or
Person combines certain components or different components, such as micro-grid system can also be set including input-output equipment, network insertion
Standby, bus etc..
Alleged processor 300 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
Memory 301 can be the internal storage unit of micro-grid system 30, such as the hard disk or memory of micro-grid system 30.It deposits
Reservoir 301 is also possible to the plug-in type hard disk being equipped on the External memory equipment of micro-grid system 30, such as micro-grid system 30, intelligence
Storage card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash card (Flash Card)
Deng.Further, memory 301 can also both including micro-grid system 30 internal storage unit and also including External memory equipment.
Memory 301 is for storing other programs and data needed for computer program and micro-grid system.Memory 301 can also be used
In temporarily storing the data that has exported or will export.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If integrated module/unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the present invention realizes above-described embodiment side
All or part of the process in method can also instruct relevant hardware to complete by computer program, computer program
It can be stored in a computer readable storage medium, the computer program is when being executed by processor, it can be achieved that above-mentioned each side
The step of method embodiment.Wherein, computer program includes computer program code, and computer program code can be source code
Form, object identification code form, executable file or certain intermediate forms etc..Computer-readable medium may include: that can carry
Any entity or device of computer program code, recording medium, USB flash disk, mobile hard disk, magnetic disk, CD, computer storage,
Read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electricity
Carrier signal, telecommunication signal and software distribution medium etc..It should be noted that the content that computer-readable medium includes can be with
According to making laws in jurisdiction and the requirement of patent practice carries out increase and decrease appropriate, such as in certain jurisdictions, according to
Legislation and patent practice, computer-readable medium do not include electric carrier signal and telecommunication signal.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (10)
1. in a kind of micro-grid system virtual synchronous machine and machine control method, which is characterized in that the virtual synchronous machine and machine system
System includes: multiple energy-storage units, and the multiple virtual synchronous machines to connect one to one with multiple energy-storage units, Yi Jifen
The Intelligent power distribution device not connecting with multiple virtual synchronous machines and power grid, the control method include:
The network voltage is obtained, judges whether the network voltage meets preset Grid-connection standards；
If the network voltage meets preset Grid-connection standards, the status information of each energy-storage units and each described is obtained
The status information of virtual synchronous machine；
Each virtual synchronous machine operating mode and grid-connected booting are set according to the status information of each energy-storage units；
If the network voltage does not meet preset Grid-connection standards, it is selected according to preset rules in multiple virtual synchronous machines
In one be main virtual synchronous machine, remaining is from virtual synchronous machine；
Control is switched on from virtual synchronous machine off-network after controlling main virtual synchronous machine elder generation's off-network booting.
2. as described in claim 1 and machine control method, which is characterized in that according to the status information of each energy-storage units
It sets each virtual synchronous machine operating mode and grid-connected booting includes:
It is determined currently without reason according to the status information of each energy-storage units and the status information of each virtual synchronous machine
The virtual synchronous machine of barrier state, and determine that each energy-storage units needs are charged or discharged；
It is sent according to the charge-discharge power demand of each energy-storage units to the virtual synchronous machine being connect with each energy-storage units
Value and power reference；
The grid-connected booting of each virtual synchronous machine is controlled according to the value and power reference.
3. as claimed in claim 2 and machine control method, which is characterized in that specific further include:
When energy-storage units are in charge requirement, negative power reference value is sent to the virtual synchronous connecting with the energy-storage units
Machine；
When energy-storage units are in electric discharge demand, positive reference value is sent to the virtual synchronous connecting with the energy-storage units
Machine.
4. as described in claim 1 and machine control method, which is characterized in that in multiple virtual synchronous machines according to default rule
Select one of them then as main virtual synchronous machine, remaining is to include: from virtual synchronous machine
Acquire the status information of each energy-storage units and the status information of each virtual synchronous machine；
It is determined currently without reason according to the status information of each energy-storage units and the status information of each virtual synchronous machine
The virtual synchronous machine of barrier state, and determine whether each energy-storage units meet electric discharge demand；
It determines unfaulty conditions and the energy-storage units that are connected meets the virtual synchronous board number N* of electric discharge demand；
The communication id of the N* platform virtual synchronous machine is ranked up；
A wherein virtual synchronous machine is arranged as main virtual synchronous machine, the setting of remaining virtual synchronous machine according to the communication id
For from virtual synchronous machine.
5. as claimed in claim 4 and machine control method, which is characterized in that it is described will a wherein void according to the communication id
Quasi- synchronous machine is arranged as main virtual synchronous machine, remaining virtual synchronous machine is set as from virtual synchronous machine are as follows:
The smallest virtual synchronous machine of the communication id is arranged as main virtual synchronous machine, remaining virtual synchronous machine is set as from void
Quasi- synchronous machine.
6. as described in claim 1 and machine control method, which is characterized in that control main virtual synchronous machine elder generation's off-network booting
After control from virtual synchronous machine elder generation's off-network booting include:
Broadcast transmission power-on instruction is to the main virtual synchronous machine；
Judge after the main virtual synchronous machine off-network booting whether to provide from virtual synchronous machine and machine output voltage to be described, if
It is that then broadcast transmission waits for power-on instruction to described from virtual synchronous machine；
Whether judgement is described meets booting voltage from virtual synchronous machine outlet side voltage, if so, send power-on instruction arrive described in from
Virtual synchronous machine.
7. as described in claim 1 and machine control method, which is characterized in that opened in control main virtual synchronous machine elder generation off-network
Control is after the booting of virtual synchronous machine elder generation's off-network after machine further include:
Obtain the virtual synchronous board number N being currently under off-grid operation state；
Obtain the gross rated capacity Sn of virtual synchronous machine described in N platform, current micro-grid system the first load access capacity SL1 and
Second load access capacity SL2；
Compare the gross rated capacity Sn of each virtual synchronous machine, the first load access capacity SL1 of current system and the
The amount of capacity of two load access capacity SL2；
The connection of first load and/or the second load and the virtual synchronous machine is closed according to the comparison result.
8. as claimed in claim 7 and machine control method, which is characterized in that described according to comparison result closure described the
One load and/or the second load and the connection of the virtual synchronous machine specifically include:
When the gross rated capacity Sn of the virtual synchronous machine is not less than the first load access capacity SL1 and second load
When the summation of access capacity SL2, transmission control instruction or signal control first load of its closure to Intelligent power distribution device and connect
Enter the first switch of system and the second switch of the second load access system；
When the gross rated capacity Sn of the virtual synchronous machine is not less than the access capacity SL1 of first load and described virtual same
The gross rated capacity Sn of step machine is less than the access capacity SL1's of the first load and access capacity SL2 of second load
When summation, sends control instruction or signal and to Intelligent power distribution device control it and be closed described first and load the first of access system and open
It closes.
9. a kind of micro-grid system, including memory, processor and storage are in the memory and can be on the processor
The computer program of operation, which is characterized in that the processor realizes such as claim 1 to 8 when executing the computer program
In described in any item micro-grid systems virtual synchronous machine and the step of machine control method.
10. a kind of computer readable storage medium, the computer-readable recording medium storage has computer program, and feature exists
In the computer program is realized virtual same in micro-grid system as claimed in any one of claims 1 to 8 when being executed by processor
Step machine and the step of machine control method.
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