CN108258735A - A kind of simulation control method and system that virtual impedance is introduced in virtual synchronous machine - Google Patents
A kind of simulation control method and system that virtual impedance is introduced in virtual synchronous machine Download PDFInfo
- Publication number
- CN108258735A CN108258735A CN201810234921.2A CN201810234921A CN108258735A CN 108258735 A CN108258735 A CN 108258735A CN 201810234921 A CN201810234921 A CN 201810234921A CN 108258735 A CN108258735 A CN 108258735A
- Authority
- CN
- China
- Prior art keywords
- virtual
- impedance
- voltage
- control
- virtual impedance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
- H02J3/50—Controlling the sharing of the out-of-phase component
Abstract
The invention discloses a kind of simulation control methods that virtual impedance is introduced in virtual synchronous machine, it is characterized in that, the method introduces virtual impedance so as to remold the output impedance of inverter on the outlet line of inverter, realizes the decoupling of active reactive, specifically includes：Reference voltage is determined, and calculate the pressure drop on virtual impedance by virtual synchronous machine control three phase sine wave producer；The difference of the pressure drop on the reference voltage and virtual impedance is calculated, and the exit potential of LC wave filters is controlled to track the difference by dual-loop control circuit, virtual impedance is added in the virtual synchronous machine；According to the control mode that voltage-tracing device is decoupled under synchronous coordinate system using dual-loop control circuit, virtual impedance is realized under dq coordinate systems.The present invention remolds the output impedance of inverter by virtual impedance, improves control, solves the coupled problem between active reactive.
Description
Technical field
The present invention relates to power control technology field, and void is introduced in virtual synchronous machine more particularly, to one kind
Intend the simulation control method and system of impedance.
Background technology
In electric system, power transmission is as shown in Figure 1.Wherein, z=jx, while under normal circumstances, generator rotor angle difference very little,
That is θ ≈ 0, cos θ ≈ 1, the expression formula of active reactive is as follows at this time：
As shown from the above formula, active control can be realized by adjusting voltage phase angle, and idle control can be realized by adjusting voltage difference
System.But microgrid voltage class is generally relatively low, and the impedance of circuit is generally not pure perception, i.e. z=r+jx.
The mathematic(al) representation of active reactive is as follows at this time：
As shown from the above formula, there are coupled problems between the active reactive of DG outputs.Virtual impedance can remold inversion
The output impedance of device improves control, solves the coupled problem between active reactive.But specifically virtual impedance how is introduced, and not
Virtual power is influenced, is to have the problem of to be solved.
Invention content
The present invention provides a kind of simulation control method and system that virtual impedance is introduced in virtual synchronous machine, to solve
How the Simulation Control of PQ decoupling is carried out to virtual synchronous machine the problem of is realized.
To solve the above-mentioned problems, according to an aspect of the present invention, one kind is provided to introduce virtually in virtual synchronous machine
The simulation control method of impedance, which is characterized in that the method introduces virtual impedance so as to weight on the outlet line of inverter
The output impedance of inverter is moulded, the decoupling of active reactive is realized, specifically includes：
Reference voltage is determined, and calculate the pressure drop on virtual impedance by virtual synchronous machine control three phase sine wave producer；
The difference of the pressure drop on the reference voltage and virtual impedance is calculated, and LC filtering is controlled by dual-loop control circuit
The exit potential of device tracks the difference, and virtual impedance is added in the virtual synchronous machine；
It, will be virtual according to the control mode that voltage-tracing device is decoupled under synchronous coordinate system using dual-loop control circuit
Impedance is realized under dq coordinate systems.
Preferably, wherein the virtual impedance is virtual inductor or virtual negative resistance.
Preferably, wherein when the virtual impedance of introducing is virtual inductor, pass through practical outlet of the voltage difference to inverter
Reactive power controlled.
Preferably, wherein when the virtual impedance of introducing is virtual negative resistance, pass through voltage difference actually going out to inverter
The active power of mouth is controlled.
Preferably, wherein when the virtual impedance introduced is virtual inductor, inductive impedance is much larger than resistive impedance.
Preferably, wherein when the virtual impedance introduced is virtual negative resistance, negative resistance impedance value and the resistance on circuit
Load value is equal.
Preferably, wherein under dq coordinate systems, voltage E that droop control is obtained, virtual synchronous generator output voltage
The relationship between pressure drop on reference value Vo* and virtual impedance r ξ+j ω l ξ is：
Io is virtual synchronous output generator current, and r ξ are virtual resistances, and l ξ are virtual inductors, and ω is virtual synchronous power generation
Machine exports angular frequency.
It carries out becoming under dq coordinates and get in return：
Wherein Vo*, d, Vo*, q are reference value d, the q axis components of virtual synchronous generator output voltage；Ed, Eq are sagging
Control d, q axis component of voltage being obtained；Io, d, io, q are virtual synchronous output generator current d, q axis components.
According to another aspect of the present invention, a kind of Simulation Control that virtual impedance is introduced in virtual synchronous machine is provided
System, which is characterized in that the system introduces virtual impedance so as to remold the output of inverter on the outlet line of inverter
Impedance is realized the decoupling of active reactive, is specifically included：
Pressure drop computing unit, for determining reference voltage, and calculate by virtual synchronous machine control three phase sine wave producer
Pressure drop on virtual impedance；
Virtual impedance adds in unit, for calculating the difference of the pressure drop on the reference voltage and virtual impedance, and passes through
The exit potential of dual-loop control circuit control LC wave filters tracks the difference, and virtual resistance is added in the virtual synchronous machine
It is anti-；
Realization unit of the virtual impedance under dq coordinate systems, it is double for being utilized under synchronous coordinate system according to voltage-tracing device
The control mode that loop control circuit is decoupled realizes virtual impedance under dq coordinate systems.
Preferably, wherein the virtual impedance is virtual inductor or virtual negative resistance.
Preferably, wherein when the virtual impedance of introducing is virtual inductor, pass through practical outlet of the voltage difference to inverter
Reactive power controlled.
Preferably, wherein when the virtual impedance of introducing is virtual negative resistance, pass through voltage difference actually going out to inverter
The active power of mouth is controlled.
Preferably, wherein when the virtual impedance introduced is virtual inductor, inductive impedance is much larger than resistive impedance.
Preferably, wherein when the virtual impedance introduced is virtual negative resistance, negative resistance impedance value and the resistance on circuit
Load value is equal.
Preferably, wherein under dq coordinate systems, voltage E that droop control is obtained, virtual synchronous generator output voltage
The relationship between pressure drop on reference value Vo* and virtual impedance r ξ+j ω l ξ is：
Io is virtual synchronous output generator current, and r ξ are virtual resistances, and l ξ are virtual inductors, and ω is virtual synchronous power generation
Machine exports angular frequency.
It carries out becoming under dq coordinates and get in return：
Wherein Vo*, d, Vo*, q are reference value d, the q axis components of virtual synchronous generator output voltage；Ed, Eq are sagging
Control d, q axis component of voltage being obtained；Io, d, io, q are virtual synchronous output generator current d, q axis components.
The present invention provides it is a kind of in virtual synchronous machine introduce virtual impedance simulation control method and system, first by
The control of virtual synchronous machine obtains reference voltage, calculates the pressure drop on virtual impedance, the pressure on virtual impedance is subtracted with reference voltage
Drop makes LC wave filter exit potentials track the reference value as LC wave filter exit potential reference values by double -loop control, you can
Realization adds in virtual impedance in control.Due to non-pure emotional resistance, there are couplings between active power and reactive power
It closes.The fluctuation of active power can be embodied in the reactive power of VSG outputs, and vice versa.Therefore, based on former existing for coupling
Cause is controlled by the virtual impedance of introducing, can weaken the active component in impedance in control circuit, constructs emotional resistance item
Part, the simulation result compared by several groups demonstrate the validity that virtual impedance decouples.Although coupling cannot be eliminated completely,
It is that can substantially weaken coupling.By virtual impedance remold inverter output impedance, improve control, solve active reactive it
Between coupled problem.
Description of the drawings
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by：
Fig. 1 is power transmission schematic diagram；
Fig. 2 is the simulation control method 200 that virtual impedance is introduced in virtual synchronous machine according to embodiment of the present invention
Flow chart；
Fig. 3 is the schematic diagram according to the introducing virtual impedance of embodiment of the present invention；
Fig. 4 is the virtual synchronous machine control block diagram containing virtual impedance according to embodiment of the present invention；
Fig. 5 is according to the virtual impedance of embodiment of the present invention and voltage and current double -loop control block diagram；
Fig. 6 is the simulation model according to the main circuit of embodiment of the present invention.
Fig. 7 is the phaselocked loop block diagram according to embodiment of the present invention.
Fig. 8 is the active power and frequency control block diagram according to embodiment of the present invention.
Fig. 9 is the reactive power/voltage control block diagram according to embodiment of the present invention.
Figure 10 is to decouple double -loop control block diagram with voltage and current according to the virtual impedance of embodiment of the present invention.
Figure 11 is the first three groups emulation experiment oscillogram according to embodiment of the present invention.
Figure 12 is rear three groups of emulation experiment oscillograms according to embodiment of the present invention.
Figure 13 is the simulation control subsystem that virtual impedance is introduced in virtual synchronous machine according to embodiment of the present invention
1300 schematic diagram.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to attached drawing, however, the present invention can use many different shapes
Formula is implemented, and be not limited to the embodiment described herein, and to provide these embodiments be to disclose at large and fully
The present invention, and fully convey the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon is remembered.
Unless otherwise indicated, term used herein has person of ordinary skill in the field (including scientific and technical terminology)
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The linguistic context of related field has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 2 is the simulation control method 200 that virtual impedance is introduced in virtual synchronous machine according to embodiment of the present invention
Flow chart.As shown in Fig. 2, the Simulation Control that virtual impedance is introduced in virtual synchronous machine that embodiments of the present invention provide
Method obtains reference voltage by the control of virtual synchronous machine first, calculates the pressure drop on virtual impedance, subtracted virtually with reference voltage
Pressure drop in impedance makes LC wave filter exit potentials track the ginseng as LC wave filter exit potential reference values by double -loop control
Examine value, you can realize and virtual impedance is added in control.Due to non-pure emotional resistance, active power and reactive power it
Between exist coupling.The fluctuation of active power can be embodied in the reactive power of VSG outputs, and vice versa.Therefore, it is deposited based on coupling
The reason of, controlled by the virtual impedance of introducing, can weaken the active component in impedance in control circuit, construction is perceptual
Impedance conditions, the simulation result compared by several groups demonstrate the validity that virtual impedance decouples.Although coupling cannot be eliminated completely
It closes, but can substantially weaken coupling.The output impedance of inverter is remolded by virtual impedance, control is improved, solves active
Coupled problem between idle.The Simulation Control that virtual impedance is introduced in virtual synchronous machine that embodiments of the present invention provide
Method 100 introduces virtual impedance so as to remold the output impedance of inverter on the outlet line of inverter, realizes active reactive
Decoupling.It specifically includes, reference voltage is determined, and calculate by virtual synchronous machine control three phase sine wave producer in step 101
Pressure drop on virtual impedance.Preferably, wherein the virtual impedance is virtual inductor or virtual negative resistance.
Preferably, wherein when the virtual impedance of introducing is virtual inductor, pass through practical outlet of the voltage difference to inverter
Reactive power controlled.Preferably, wherein when the virtual impedance introduced is virtual inductor, inductive impedance is hindered much larger than resistance
It is anti-.
Preferably, wherein when the virtual impedance of introducing is virtual negative resistance, pass through voltage difference actually going out to inverter
The active power of mouth is controlled.Preferably, wherein the virtual impedance introduced be virtual negative resistance when, negative resistance impedance value with
Ohmic load numerical value on circuit is equal.
The principle of the present invention is：Virtual impedance can remold the output impedance of inverter, improve control.Introduce virtual impedance
System afterwards is equivalent as shown in Figure 3.Wherein, C points are the point of common coupling of inverter, and B points are the practical outlets of inverter, A points
It is the virtual outlet of inverter.Line impedance ZL=R+jX, virtual impedance Zvirtual.If Zvirtual+ZL is pure perception
For pure perception, decoupling can be realized in the power of A points, and specific method is divided into virtual inductor control and the control of virtual negative resistance, connects down
To describe in detail to two methods.
When introducing virtual inductor, i.e. Zvirtual=Xvirtual, if Xvirtual+X is much larger than R, the power of A points
Decoupling can be realized.In B points：
P=P '
As shown from the above formula, the idle of B points can still be controlled by voltage difference.
When introducing virtual negative resistance, i.e. Zvirtual=-Rvirtual, if Rvirtual=R, output impedance is in pure
Decoupling can be realized in perception, the power of A points.In B points：
Q=Q '
As shown from the above formula, the active of B points can still be controlled by voltage phase angle.
In conclusion virtual impedance technology can optimize the control of traditional virtual synchronous generator, the solution of active reactive is realized
Coupling.
Preferably, the difference of the pressure drop on the reference voltage and virtual impedance is calculated in step 102, and passes through bicyclic control
The exit potential of circuit control LC wave filters processed tracks the difference, and virtual impedance is added in the virtual synchronous machine.
Preferably, it is decoupled in step 103 according to voltage-tracing device using dual-loop control circuit under synchronous coordinate system
Control mode, virtual impedance is realized under dq coordinate systems.
Preferably, wherein under dq coordinate systems, voltage E that droop control is obtained, virtual synchronous generator output voltage
The relationship between pressure drop on reference value Vo* and virtual impedance r ξ+j ω l ξ is：
Io is virtual synchronous output generator current, and r ξ are virtual resistances, and l ξ are virtual inductors, and ω is virtual synchronous power generation
Machine exports angular frequency.
It carries out becoming under dq coordinates and get in return：
Wherein Vo*, d, Vo*, q are reference value d, the q axis components of virtual synchronous generator output voltage；Ed, Eq are sagging
Control d, q axis component of voltage being obtained；Io, d, io, q are virtual synchronous output generator current d, q axis components.
In embodiments of the present invention, according to the principle of virtual impedance, reference is obtained by the control of virtual synchronous machine first
Voltage uref calculates the pressure drop uvirtual on virtual impedance, uvirtual is subtracted as LC wave filter exit potentials by the use of uref
Reference value makes LC wave filter exit potentials track the reference value by double -loop control, you can realizes and virtual resistance is added in control
It is anti-.Specific implementation is as shown in Figure 4.
Fig. 5 is the virtual synchronous machine control block diagram containing virtual impedance according to embodiment of the present invention, under dq coordinate systems
Virtual impedance realize.As shown in figure 4, for the virtual synchronous machine control principle based on virtual impedance.Related power control part
It does not repeat herein.Since voltage-tracing device uses outer voltage, the decoupling control mode of current inner loop, institute under synchronous coordinate system
To need to realize virtual impedance under dq coordinate systems.The dq variations coordinate system of selection is as shown in the figure.So droop control is obtained
Voltage E, between the pressure drop on reference value Vo* and virtual impedance r ξ+j ω the l ξ of virtual synchronous generator output voltage
Relationship is：
Io is virtual synchronous output generator current, and r ξ are virtual resistances, and l ξ are virtual inductors, and ω is virtual synchronous power generation
Machine exports angular frequency.
It carries out becoming under dq coordinates and get in return：
Wherein Vo*, d, Vo*, q are reference value d, the q axis components of virtual synchronous generator output voltage；Ed, Eq are sagging
Control d, q axis component of voltage being obtained；Io, d, io, q are virtual synchronous output generator current d, q axis components.Fig. 6 is root
According to the virtual impedance of embodiment of the present invention and voltage and current double -loop control block diagram.
Fig. 6 is the simulation model according to the main circuit of embodiment of the present invention.As shown in fig. 6, the emulation mould for main circuit
Type.Wherein, the voltage of direct voltage source is 0.8kV；Filter inductance is 0.044mH；The resistance value of filter inductance is 0.0005ohm；
Filtering capacitance is 1332F；Power grid resistance is 0.0017ohm, and power grid inductance is 0.0055mH；Grid line voltage virtual value is
0.69kV.Ifabc, Igabc, it is inductive current and grid-connected current respectively；Uabc is capacitance voltage.
Fig. 7 is the phaselocked loop block diagram according to embodiment of the present invention.Wherein, Ud is inverter output voltage d axis components, Uq
It is inverter output voltage q axis components, ω g are network voltages, and ω PLL are the network voltages that phaselocked loop detects, OPLL is lock
The lock phase angle of phase ring output, the proportionality coefficient of PI controllers is 0.084, integral coefficient 4.69, and transmission function is
Fig. 8 is the active power and frequency control block diagram according to embodiment of the present invention.Wherein, ω ref are with reference to angular frequency, and ω is
The inverter calculated by droop control exports angular frequency, and 0 is the inverter output angle calculated by droop control, ω
PLL is net side angular frequency, and ω B are angular frequency reference values, and Pref is active reference value, and Pe is inverter active power of output, is passed
Delivery function is
Fig. 9 is the reactive power/voltage control block diagram according to embodiment of the present invention.Qref is reactive power reference qref, and Qe is nothing
Work(power measurement values, Eo are voltage reference values, and E is voltage calculated value.The proportionality coefficient of pi regulator is 0.001, integral constant
It is 0.15.0 is the angle that active droop control obtains, and E is the voltage magnitude that idle droop control obtains, and ea, eb, ec is synthesis
Three-phase voltage, Ed, Eq are the d of the voltage obtained by droop control, q components.
Figure 10 is to decouple double -loop control block diagram with voltage and current according to the virtual impedance of embodiment of the present invention.Wherein, Ed,
Eq is the d of the voltage obtained by droop control, q components；Igd, igq are the d of inverter output current, q components；ω VSM are
Inverter output frequency；Ud, Uq are the d of inverter output voltage measured value, q axis components；Ifd, ifq are the d of inductive current, q
Component；The PI controllers proportionality coefficient of Voltage loop is 0.59, integral constant 736；The PI controller proportionality coefficients of electric current loop are
1.27, integral constant 14.3；Oi is DC voltage perunit value；Md, mq are PWM modulation signals.Virtual synchronous owner's circuit
Parameters are as shown in table 1.
1 virtual synchronous machine parameter list of table
Figure 11 is the first three groups emulation experiment oscillogram according to embodiment of the present invention.By oscillogram it is found that working as inverter
During the R/X=1 of output terminal, the peak value of active variation is 0.17pu；As the R/X=0.02 of inverter output end, active variation
Peak value be 0.09pu；As the R/X=0.005 of inverter output end, the peak value of active variation is 0.043pu；It can be seen that
It is idle to be influenced gradually to weaken by active variation when virtual inductor is sufficiently large, it can realize decoupling.
Figure 12 is rear three groups of emulation experiment oscillograms according to embodiment of the present invention.By oscillogram it is found that working as inverter
During the R/X=1 of output terminal, the peak value of active variation is -0.17pu；As the R/X=0.02 of inverter output end, active variation
Peak value be -0.087pu；As the R/X=0.005 of inverter output end, the peak value of active variation is -0.03pu；Thus may be used
See, it is idle to be influenced gradually to weaken by active variation when virtual inductor is sufficiently large, it can realize decoupling.
Figure 13 is the simulation control subsystem that virtual impedance is introduced in virtual synchronous machine according to embodiment of the present invention
1300 schematic diagram.As shown in figure 13, what embodiments of the present invention provided introduces the imitative of virtual impedance in virtual synchronous machine
True control system 1300 introduces virtual impedance so as to remold the output impedance of inverter on the outlet line of inverter, and realization has
The decoupling that work(is idle, shown system specifically include：Pressure drop computing unit 1301, virtual impedance add in unit 1302 and virtual impedance
Realization unit 1303 under dq coordinate systems.Preferably, in the pressure drop computing unit, for controlling three-phase by virtual synchronous machine
Sine-wave generator determines reference voltage, and calculates the pressure drop on virtual impedance.Preferably, wherein the virtual impedance is virtual
Inductance or virtual negative resistance.
Preferably, wherein when the virtual impedance of introducing is virtual inductor, pass through practical outlet of the voltage difference to inverter
Reactive power controlled.Preferably, wherein when the virtual impedance introduced is virtual inductor, inductive impedance is hindered much larger than resistance
It is anti-.
Preferably, wherein when the virtual impedance of introducing is virtual negative resistance, pass through voltage difference actually going out to inverter
The active power of mouth is controlled.Preferably, wherein the virtual impedance introduced be virtual negative resistance when, negative resistance impedance value with
Ohmic load numerical value on circuit is equal.
Preferably, unit 1302 is added in the virtual impedance, calculates the pressure drop on the reference voltage and virtual impedance
Difference, and the exit potential of LC wave filters is controlled to track the difference by dual-loop control circuit, in the virtual synchronous machine
The middle virtual resistance of addition.
Preferably, the realization unit 1303 in the virtual impedance under dq coordinate systems, according to voltage-tracing device in synchronization
The control mode decoupled under coordinate system using dual-loop control circuit is realized virtual impedance under dq coordinate systems.Preferably,
Wherein under dq coordinate systems, voltage E that droop control is obtained, the reference value Vo* of virtual synchronous generator output voltage and virtual
The relationship between pressure drop on impedance r ξ+j ω l ξ is：
Io is virtual synchronous output generator current, and r ξ are virtual resistances, and l ξ are virtual inductors, and ω is virtual synchronous power generation
Machine exports angular frequency.
It carries out becoming under dq coordinates and get in return：
Wherein Vo*, d, Vo*, q are reference value d, the q axis components of virtual synchronous generator output voltage；Ed, Eq are sagging
Control d, q axis component of voltage being obtained；Io, d, io, q are virtual synchronous output generator current d, q axis components.
The simulation control subsystem 1300 that virtual impedance is introduced in virtual synchronous machine and the present invention of the embodiment of the present invention
Another embodiment the simulation control method 200 that virtual impedance is introduced in virtual synchronous machine it is corresponding, it is no longer superfluous herein
It states.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
What subsidiary Patent right requirement was limited, in addition to the present invention other embodiments disclosed above are equally fallen the present invention's
In the range of.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one of described device, component etc. example is construed to, unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (14)
1. a kind of simulation control method that virtual impedance is introduced in virtual synchronous machine, which is characterized in that the method is in inversion
Virtual impedance is introduced on the outlet line of device so as to remold the output impedance of inverter, is specifically included：
Reference voltage is determined, and calculate the pressure drop on virtual impedance by virtual synchronous machine control three phase sine wave producer；
The difference of the pressure drop on the reference voltage and virtual impedance is calculated, and LC wave filters are controlled by dual-loop control circuit
Exit potential tracks the difference, and virtual impedance is added in the virtual synchronous machine；
According to the control mode that voltage-tracing device is decoupled under synchronous coordinate system using dual-loop control circuit, by virtual impedance
It is realized under dq coordinate systems, the dual-loop control circuit, including the control of outer loop voltag and inner ring current control.
2. according to the method described in claim 1, it is characterized in that, the virtual impedance is virtual inductor or virtual negative electricity
Resistance.
3. according to the method described in claim 2, it is characterized in that, when the virtual impedance of introducing is virtual inductor, pass through electricity
Pressure difference controls the reactive power of the practical outlet of inverter.
4. according to the method described in claim 2, it is characterized in that, when the virtual impedance of introducing is virtual negative resistance, pass through
Voltage difference controls the active power of the practical outlet of inverter.
5. according to the method described in claim 2, it is characterized in that, introduce virtual impedance be virtual inductor when, inductive impedance
Much larger than resistive impedance.
6. according to the method described in claim 2, it is characterized in that, introduce virtual impedance be virtual negative resistance when, negative resistance
Impedance value is equal with the ohmic load numerical value on circuit.
7. according to the method described in claim 1, it is characterized in that, under dq coordinate systems, voltage E that droop control is obtained is empty
Intend the reference value Vo* of synchronous generator output voltage and virtual impedance rξ+j·w·lξOn pressure drop between relationship be：
Io is virtual synchronous output generator current, and r ξ are virtual resistances, and l ξ are virtual inductors, and ω is that virtual synchronous generator is defeated
Go out angular frequency；
It carries out becoming under dq coordinates and get in return：
Wherein Vo*, d, Vo*, q are reference value d, the q axis components of virtual synchronous generator output voltage；Ed, Eq are droop controls
D, q axis component for the voltage being obtained；Io, d, io, q are virtual synchronous output generator current d, q axis components；
The dual-loop control circuit, including the control of outer loop voltag and inner ring current control, in the control of outer loop voltag and interior circular current
In the voltage-tracing device of control, virtual impedance can be realized under dq coordinate systems.
8. a kind of simulation control subsystem that virtual impedance is introduced in virtual synchronous machine, which is characterized in that the system is in inversion
Virtual impedance is introduced on the outlet line of device so as to remold the output impedance of inverter, realizes the decoupling of active reactive, it is specific to wrap
It includes：
Pressure drop computing unit for determining reference voltage by virtual synchronous machine control three phase sine wave producer, and calculates virtual
Pressure drop in impedance；
Virtual impedance adds in unit, for calculating the difference of the pressure drop on the reference voltage and virtual impedance, and passes through bicyclic
The exit potential of control circuit control LC wave filters tracks the difference, and virtual impedance is added in the virtual synchronous machine；
Realization unit of the virtual impedance under dq coordinate systems, for utilizing bicyclic control under synchronous coordinate system according to voltage-tracing device
The control mode that circuit processed is decoupled realizes virtual impedance under dq coordinate systems.
9. system according to claim 8, which is characterized in that the virtual impedance is virtual inductor or virtual negative electricity
Resistance.
10. system according to claim 9, which is characterized in that when the virtual impedance of introducing is virtual inductor, pass through electricity
Pressure difference controls the reactive power of the practical outlet of inverter.
11. system according to claim 9, which is characterized in that when the virtual impedance of introducing is virtual negative resistance, pass through
Voltage difference controls the active power of the practical outlet of inverter.
12. system according to claim 9, which is characterized in that when the virtual impedance of introducing is virtual inductor, inductive impedance
Much larger than resistive impedance.
13. system according to claim 9, which is characterized in that when the virtual impedance of introducing is virtual negative resistance, negative resistance
Impedance value is equal with the ohmic load numerical value on circuit.
14. system according to claim 8, which is characterized in that under dq coordinate systems, voltage E that droop control is obtained is empty
Intend the reference value Vo* of synchronous generator output voltage and virtual impedance rξ+j·w·lξOn pressure drop between relationship be：
Io is virtual synchronous output generator current, and r ξ are virtual resistances, and l ξ are virtual inductors, and ω is that virtual synchronous generator is defeated
Go out angular frequency.
It carries out becoming under dq coordinates and get in return：
Wherein Vo*, d, Vo*, q are reference value d, the q axis components of virtual synchronous generator output voltage；Ed, Eq are droop controls
D, q axis component for the voltage being obtained；Io, d, io, q are virtual synchronous output generator current d, q axis components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810234921.2A CN108258735A (en) | 2018-03-21 | 2018-03-21 | A kind of simulation control method and system that virtual impedance is introduced in virtual synchronous machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810234921.2A CN108258735A (en) | 2018-03-21 | 2018-03-21 | A kind of simulation control method and system that virtual impedance is introduced in virtual synchronous machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108258735A true CN108258735A (en) | 2018-07-06 |
Family
ID=62746968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810234921.2A Pending CN108258735A (en) | 2018-03-21 | 2018-03-21 | A kind of simulation control method and system that virtual impedance is introduced in virtual synchronous machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108258735A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111725799A (en) * | 2019-03-18 | 2020-09-29 | 中国电力科学研究院有限公司 | Impedance calculation method and system based on coordinate transformation |
| CN112398159A (en) * | 2020-11-12 | 2021-02-23 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission alternating-current operation method, device, equipment and storage medium |
| CN113726001A (en) * | 2021-07-23 | 2021-11-30 | 华为数字能源技术有限公司 | System control method and related device |
| WO2022022202A1 (en) * | 2020-07-30 | 2022-02-03 | 合肥工业大学 | Inductance current differential feedback-based virtual synchronous machine strong power grid stability control method |
| CN114759562A (en) * | 2022-06-15 | 2022-07-15 | 哈尔滨工业大学 | Common coupling point harmonic suppression method based on grid-connected inverter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160134201A1 (en) * | 2014-11-06 | 2016-05-12 | Delta Electronics, Inc. | Control method and control device for inverter system |
| CN106301055A (en) * | 2016-09-27 | 2017-01-04 | 天津大学 | Inverter parallel loop current suppression system based on virtual synchronous generator control strategy |
| CN106786780A (en) * | 2017-03-02 | 2017-05-31 | 江苏大学 | A kind of grid-connected control method and system based on virtual synchronous generator |
| CN106786733A (en) * | 2016-12-05 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | A kind of control method, the apparatus and system of virtual synchronous generator |
-
2018
- 2018-03-21 CN CN201810234921.2A patent/CN108258735A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160134201A1 (en) * | 2014-11-06 | 2016-05-12 | Delta Electronics, Inc. | Control method and control device for inverter system |
| CN106301055A (en) * | 2016-09-27 | 2017-01-04 | 天津大学 | Inverter parallel loop current suppression system based on virtual synchronous generator control strategy |
| CN106786733A (en) * | 2016-12-05 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | A kind of control method, the apparatus and system of virtual synchronous generator |
| CN106786780A (en) * | 2017-03-02 | 2017-05-31 | 江苏大学 | A kind of grid-connected control method and system based on virtual synchronous generator |
Non-Patent Citations (1)
| Title |
|---|
| 唐酿 等: "基于自抗扰控制技术的虚拟同步机无频差控制方法", 《广东电力》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111725799A (en) * | 2019-03-18 | 2020-09-29 | 中国电力科学研究院有限公司 | Impedance calculation method and system based on coordinate transformation |
| CN111725799B (en) * | 2019-03-18 | 2023-11-03 | 中国电力科学研究院有限公司 | Impedance calculation method and system based on coordinate transformation |
| WO2022022202A1 (en) * | 2020-07-30 | 2022-02-03 | 合肥工业大学 | Inductance current differential feedback-based virtual synchronous machine strong power grid stability control method |
| US11967825B2 (en) | 2020-07-30 | 2024-04-23 | Hefei University Of Technology | Stability control method for virtual synchronous generator in strong grid based on inductance-current differential feedback |
| CN112398159A (en) * | 2020-11-12 | 2021-02-23 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission alternating-current operation method, device, equipment and storage medium |
| CN113726001A (en) * | 2021-07-23 | 2021-11-30 | 华为数字能源技术有限公司 | System control method and related device |
| CN114759562A (en) * | 2022-06-15 | 2022-07-15 | 哈尔滨工业大学 | Common coupling point harmonic suppression method based on grid-connected inverter |
| CN114759562B (en) * | 2022-06-15 | 2022-08-26 | 哈尔滨工业大学 | Common coupling point harmonic suppression method based on grid-connected inverter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108258735A (en) | A kind of simulation control method and system that virtual impedance is introduced in virtual synchronous machine | |
| CN110198055B (en) | Micro-grid bidirectional converter control and stability analysis method based on virtual synchronous machine | |
| De et al. | Decentralized parallel operation of inverters sharing unbalanced and nonlinear loads | |
| CN107248756B (en) | Control method for improving parallel power distribution precision of multiple inverters in micro-grid | |
| CN105811421B (en) | A kind of micro-capacitance sensor auxiliary master-slave control method based on modified droop control | |
| CN100550568C (en) | Harmonic wave dynamic managing and reactive-load dynamic compensation compound control method and implement device thereof | |
| EP2683077B1 (en) | Inverter power-controller for a generating system based on a static power converter | |
| Guerrero et al. | Decentralized control for parallel operation of distributed generation inverters in microgrids using resistive output impedance | |
| CN106712088A (en) | Low-voltage micro-grid inverter control system based on virtual impedance and virtual power source | |
| CN113285486B (en) | Droop control-based control method for loop current between parallel inverters | |
| CN110137971B (en) | Voltage stability control method for three-phase alternating current power spring | |
| Oureilidis et al. | A decentralized impedance-based adaptive droop method for power loss reduction in a converter-dominated islanded microgrid | |
| CN103259268A (en) | Microgrid reactive-voltage control device and control method thereof | |
| CN208142845U (en) | A kind of system for being inhibited to circulation of virtual synchronous machine when grid-connected | |
| CN105098798B (en) | The control method that a kind of reactive power of distributed power source in parallel is divided equally | |
| CN108063443A (en) | A kind of alternating current-direct current bi-directional power conversion control method | |
| CN103997040B (en) | Improve active electric filter device harmonic wave control and the method for reactive-load compensation effect | |
| Wang et al. | Power quality enhancement in islanded microgrids via closed-loop adaptive virtual impedance control | |
| CN108448641A (en) | A kind of simulation control method and system for carrying out PQ decouplings to virtual synchronous machine | |
| CN109494795A (en) | The inverse dip control method of tandem type distributed energy resource system, apparatus and system | |
| CN108964147A (en) | A method of improving the distribution of shunt chopper reactive power | |
| CN107611997A (en) | A kind of subsynchronous suppressing method of synchronous generator and system | |
| Kanase et al. | Distribution static compensator for power quality improvement using PV array | |
| Ali et al. | Synthesizing averaged virtual oscillator dynamics to control inverters with an output LCL filter | |
| Benazza et al. | Backstepping control of three-phase multilevel series active power filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180706 |