CN109510248A - It can inhibit the virtual synchronous inverter control method and storage medium of active oscillation - Google Patents
It can inhibit the virtual synchronous inverter control method and storage medium of active oscillation Download PDFInfo
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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
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The present invention provides a kind of virtual synchronous inverter control method and storage medium that can inhibit active oscillation, can solve the technical problem that existing the relevant technologies keep system unstable.Include: that automatic virtual blocks control algolithm is added on active power controller ring, extracts frequency low-frequency oscillation component, adjust active power controller ring electromagnetic torque, weaken the active oscillation of virtual synchronous inverter；On Reactive Power Control ring, virtual impedance control algolithm is added, adjusts Reactive Power Control ring output voltage modulated signal, reduces the coupling of active power and reactive power, realizes that instantaneous power increment divides equally condition, to inhibit the excitation of active oscillation；Virtual synchronous inverter active power vibrates when the present invention can solve the problems, such as load fluctuation in terms of inhibiting vibratory stimulation and enhancing virtual synchronous inverter itself to damp two, and guarantees to improve the accurate of active power while inhibiting oscillation and divide equally and reactive power divides equally performance, the voltage stabilization of guarantee PCC point.
Description
Technical field
The present invention relates to technical field of inverter control, and in particular to a kind of virtual synchronous that can inhibit active oscillation is inverse
Become device control method and storage medium.
Background technique
Virtual synchronous inverter used in simulation conventional synchronization motor is a kind of inverter of power grid friendly.It is virtual same
Step inverter has inertial properties, so that it has in terms of inhibiting the high-frequency fluctuation of system frequency and maintaining system frequency stabilization
There is greater advantage.The introducing of inertia is that virtual synchronous inverter realizes output power quick response and frequency jitter suppression
Basic reason.However, the introducing of exactly inertia, again such that virtual synchronous inverter is provided with similar to synchronous generator
The lesser characteristic of system damping, makes it be easy to happen active power oscillations.For synchronous generator, due to its overcurrent energy
Power is strong, so short-term oscillation of power not will cause excessive harm, and inverter is then different, due to switching device capacity
Limitation, oscillation of power are much larger than synchronous motor to the harm of virtual synchronous inverter.Caused oscillation of power is not when load fluctuation
The safe operation that only threaten inverter itself will also cause to seriously affect to power grid.Therefore it needs to propose a kind of effective
Inhibit the method for more active oscillations of virtual synchronous inverter system.
The relevant technologies that oscillation of power when currently to the parallel system load fluctuation of virtual synchronous inverter is inhibited
It is as follows: inhibit by adjusting the virtual synchronous inverter such as inertial properties and sagging coefficient control parameter itself to realize to vibrate, this
The basic mechanism of class control can be attributed to the improvement damped to virtual synchronous inverter itself.Virtual impedance is introduced to realize
The inhibition of oscillation of power, the basic mechanism of such methods can be attributed to inhibit vibratory stimulation.
But the above the relevant technologies have the following deficiencies:
1) realize that the method that oscillation inhibits usually requires to introduce differential or ratio by dynamic regulation inertia coeffeicent J
Integral element, differentiation element are easy amplification high-frequency signal, it is difficult to practical application.There is system frequency in proportional integration link
More non-linear break, influences the stabilization of system.
2) inhibit oscillation to rely on the detection of oscillation of power by self-adaptive damping coefficient Dp, and easily cause system
Steady state power is not divided equally.
3) inhibit oscillation by introducing virtual impedance, specific situation can only be directed to, and its gained system power has vibrated
Complete repressed condition be the parameter including sagging coefficient, inertia time constant, virtual impedance etc. including be both needed to completely correspondence at
Ratio, and be actually difficult to strictly realize.
Summary of the invention
(1) the technical issues of solving
The present invention provides a kind of virtual synchronous inverter control methods and storage medium that can inhibit active oscillation, can
Solve the technical problem that existing the relevant technologies keep system unstable.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs:
A kind of virtual synchronous inverter control method can inhibit active oscillation, comprising:
A, on the active power controller ring of virtual synchronous inverter control algorithm, automatic virtual blocks control algolithm is added, leads to
Extraction frequency low-frequency oscillation component is crossed, active power controller ring electromagnetic torque is adjusted, makes the subtractive of machine torque Yu electromagnetic torque
It is small, reduce the variable quantity of angular frequency, to weaken the active oscillation of virtual synchronous inverter；
B, on the Reactive Power Control ring of virtual synchronous inverter control algorithm, virtual impedance control algolithm is added, adjusts
Whole Reactive Power Control ring output voltage modulated signal, the equivalent inductive reactance of change virtual synchronous inverter to PCC point, so that empty
The equivalent inductive reactance of quasi- synchronous inverter to PCC point is greater than line impedance, reduces the coupling of active power and reactive power, realizes
Instantaneous power increment divides equally condition, to inhibit the excitation of the virtual synchronous inverter active oscillation；
C, the active oscillation for inhibiting the virtual synchronous inverter is realized by step a and step b.
Further, virtual impedance control algolithm is added in stepb and then the estimation of PCC point busbar voltage is added and calculates
Method makes the voltage magnitude of virtual synchronous inverter detection close to PCC point voltage value.
Further, frequency low-frequency oscillation component is extracted in the step a, comprising: setting cutoff frequency, so that frequency
In ripple components by blocking filter so that direct current component can not pass through, obtain the frequency fluctuation without DC component
Amount.
Further, the automatic virtual blocks control algolithm include frequency wave momentum by described without DC component multiplied by
Damped coefficient, and be added on electromagnetic torque, form the additional damping to electromagnetic torque, damping power oscillations.
Further, the virtual impedance control algolithm includes:
Virtual synchronous inverter output voltage PWM modulation signal is first carried out to the transformation under three-phase to two-phase α β coordinate；
Then virtual impedance is introduced, with virtual synchronous inverter output voltage modulated signal plus above virtual impedance
Pressure drop is obtained by the PWM modulated signal voltage under virtual impedance α β coordinate system adjusted；
The finally inverse transformation under progress two-phase α β to three-phase abc coordinate system, the voltage being converted under tri- phase coordinate system of abc,
By adjusting the value of virtual impedance, changes virtual synchronous inverter equivalent output impedance, arrived to change virtual synchronous inverter
The substitutional connection impedance of PCC point.
Further, the PCC point busbar voltage estimating algorithm includes:
The three-phase voltage that first virtual synchronous inverter is detected carries out the transformation under three-phase to two-phase α β coordinate, then
In addition equivalent impedance XtPressure drop above, obtains the amendment voltage under α β coordinate system, obtains PCC using amplitude detection link
Point voltage magnitude Vbus；
The calculating formula of the Q in virtual synchronous inverter control algorithm is replaced with into formula (11) simultaneously,
In formula, Q indicates inverter potential output reactive power, ia, ib, icFor the output electric current of inverter, eoa, eob, eoc
For the voltage under three phase coordinate systems.
Further, the amplitude detection link specifically includes:
The amendment voltage under α β coordinate is first subjected to inverse transformation, the PCC point approximation being converted under tri- phase coordinate system of abc is estimated
Calculate voltage va, vb, vc, then PCC point voltage magnitude V is obtained using formula (10)bus；
On the other hand, the present invention provides a kind of computer storage medium, is stored thereon with virtual inverter control algorithm,
It is characterized in that, can realize the above method when processor executes the virtual inverter control algorithm.
(3) beneficial effect
The invention discloses a kind of virtual synchronous inverter control method systems that can inhibit active oscillation, can be from vibration
The inhibition and enhancing synchronous inverter itself for swinging excitation damp two aspects and solve traditional virtual synchronous inverter when load fluctuation
The problem of active power oscillations, improves the stability of system.Keep load fluctuation moment different using virtual impedance, virtual synchronous
Power between inverter (synchronverter) is divided equally according to the size of inertia, inhibits each virtual synchronous inverter initial
Vibratory stimulation caused by angular speed variation is inconsistent；Virtual synchronous inverter internal is generated using automatic virtual blocks control technology
Inhibit the damping of oscillation of power makes each virtual synchronous inverter angular speed reach consistent to rapidly deplete oscillation energy.Most
When realizing load fluctuation eventually, the inhibition to more active oscillations of virtual synchronous inverter system.The present invention can be from the angle of control algolithm
Degree quickly and effectively inhibits the active power oscillations between different rated power, different inertia time constant synchronous inverters, and
Guarantee to improve the accurate of active power while inhibiting oscillation to divide equally and reactive power divides equally performance, the voltage of guarantee PCC point
Stablize.
The prediction of busbar voltage link of present invention setting simultaneously, the reactive power for improving system divide equally performance.Not only protect
The advantage for having stayed virtual synchronous inverter itself simple and reliable and extremely low to hardware requirement, and do not need detection exit potential
Above-mentioned function can be realized.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is virtual synchronous grid-connected inverters system topological figure；
Fig. 2 is virtual synchronous inverter control algorithm；
Fig. 3 is control method schematic diagram of the embodiment of the present invention；
Fig. 4 is the virtual synchronous control block diagram that the embodiment of the present invention has active oscillation rejection ability；
Fig. 5 is virtual impedance control algolithm schematic diagram of the embodiment of the present invention；
Fig. 6 is PCC point voltage estimate method operation principle schematic diagram of the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Virtual synchronous control strategy is a kind of novel grid-connected control plan based on hidden pole type synchronous generator second-order model
Slightly.For conventional inverter, virtual synchronous inverter simulates the rotor equation of synchronous motor, and combines direct current female
Line energy storage effect, and make its ontology that there is certain inertia, the Ability of Resisting Disturbance of micro-source inverter is enhanced, has ensured microgrid
The stability of system entirety.
Virtual synchronous grid-connected inverters topological structure is as shown in Figure 1.Wherein, Ls、RsRespectively virtual synchronous inverter is defeated
Equivalent inductance and resistance of the outlet to PCC point, Lg、RgFor respectively PCC point to the equivalent inductance and resistance of public electric wire net, e is width
The voltage drive signals that value is indicated with E, θ*Derivative be given to refer to angular frequency, P*、Q*Respectively virtual synchronous control unit
Active and idle given reference value.
It is shown according to Fig. 1, virtual synchronous inverter is made of power module and electrical control two parts.Wherein, power mould
Block is made of dc-link capacitance, converter and LC filter, is mainly used for realizing the conversion of direct current to industrial-frequency alternating current；
The adjusting and control of the complete paired systems of electric control system, core algorithm are as shown in Figure 2.Wherein, J indicates to introduce virtual
Rotary inertia, Dp are virtual machine coefficient of friction, and K is reactive power inertial element coefficient, DqFor the sagging coefficient of voltage.
Algorithm block diagram top half shown in Fig. 2 is real power control ring, realizes the control of frequency and active power；Lower half
Part is idle control ring, realizes the control of voltage and reactive power.The basic control principle of algorithm such as formula (1), (2) institute
Show.Formula (1) is power calculation and the fundamental equation that reference voltage is formed, and formula (2) and formula (3) are respectively in virtual synchronous control
Frequency inertial element equation and voltage inertial element equation.
In formula, TeIndicate electromagnetic torque；TmIndicate machine torque；θ indicates the phase of hypothetical rotor, and differential value had both been empty
The angular speed of quasi- synchronous generator is the angular frequency of drive voltage signal e again；IfFor exciting current；MfModel stator winding with encourage
Maximum mutual inductance between magnetic winding；Q is reality output reactive power；I is threephase stator electric current；Symbol<,>indicate traditional dot product
Operation, in which:
Virtual synchronous control strategy simulates conventional synchronization generator model and introduces virtual inertia, for the fluctuation of power grid
It is highly beneficial, it not only can overcome the disadvantages that system adjusts caused response lag, moreover it is possible to inhibit net side active and idle high dither.
When the embodiment of the present invention has been analysed in depth the power supply of virtual synchronous inverter parallel, load fluctuation causes power to shake
The mechanism of production and influence factor swung, and conclude that not dividing equally for instantaneous active power is to vibrate the immediate cause generated,
And itself damping small, inertia greatly is then inward nature's factor of oscillation generation.It proposes and a kind of can inhibit the virtual of active oscillation
Synchronous inverter control method includes the vibratory stimulation suppression technology based on virtual impedance, with inertial parameter rather than capacity parameter
As the design standard of virtual impedance ratio, effective inhibition of oscillation of power excitation is realized；And the void including not depending on phaselocked loop
Quasi- damping, the damping of lifting system under the premise of not changing systematic steady state performance；To rapidly deplete oscillation energy,
Each virtual synchronous inverter angular speed is set to reach consistent.Prediction of busbar voltage link is also added for improving the idle of system
Power-sharing performance.
As shown in figure 3, the virtual synchronous inverter control method that can inhibit active oscillation of the embodiment of the present invention includes:
By the way that controlling unit is added on the power control loop of traditional virtual synchronization control algorithm, inhibit virtual synchronous inverse
Become the active oscillation of device；
It is specific as follows:
Step 1: on the active power controller ring of traditional virtual synchronization control algorithm, increasing damping portionBy changing electromagnetic torque Te, make active ring electromagnetic torque increase, original machine tool
Torque TmWith new electromagnetic torqueDifference reduce, make the variable quantity of angular frequencyReduce, accelerating power vibration
The decaying swung；
Step 2: on the Reactive Power Control ring of traditional virtual synchronization control algorithm, increasing virtual impedance part, pass through
Virtual impedance control algolithm, so that traditional virtual synchronizes idle ring output voltage modulated signal erefSubtract virtual impedance wnLvsMultiply
With inverter output current ig, obtain new voltage modulation signal eo=eref-wnLvs*ig, then change inverter to PCC point
Equivalent inductive reactance Xt, so that the equivalent inductive reactance of inverter to PCC point is far longer than line impedance, while active power can be reduced
It with the coupling of reactive power, realizes that instantaneous power increment divides equally condition, inhibits oscillation of power excitation；
Step 3: on the Reactive Power Control ring of traditional virtual synchronization control algorithm, increasing the estimation of PCC point busbar voltage
Link, so that former measurement gained feedback voltage ea, eb, ec(amplitude E) adds equivalent impedance XtMultiplied by detection electric current i, namely
So that former feedback voltage adds equivalent impedance XtOn pressure drop, obtain new feedback voltage vbusa, vbusb, vbusc(amplitude is
Vbus), reduce the influence due to virtual impedance to Voltage Feedback and idle calculating.
Fig. 4 is the virtual synchronous control block diagram that the embodiment of the present invention has active oscillation rejection ability；Formula (5) is specific
It is expressed as follows:
Wherein TeIndicate electromagnetic torque；TmIndicate machine torque；θ indicates the phase of hypothetical rotor, and differential value is virtual
The angular speed of synchronous generator；IfFor exciting current；MfMaximum mutual inductance between model stator winding and excitation winding；Q is practical
Output reactive power；I is threephase stator electric current；Symbol<,>indicate traditional dot-product operation.
The embodiment of the present invention is described in detail below with reference to Fig. 4:
Oscillation rapid decay principle based on automatic virtual blocks
On the power control loop of traditional virtual synchronization control algorithm, virtual impedance, which is added, can greatly weaken instantaneously
Power does not divide equally phenomenon, but cannot completely eliminate, so need to also generate in oscillation other than the excitation condition for weakening oscillation
It is effectively inhibited afterwards, therefore the virtual synchronous inverter control that can inhibit active oscillation that the embodiment of the present invention proposes
Method extracts frequency by the way that automatic virtual blocks link is added on the active power controller ring of traditional virtual synchronization control algorithm
Low-frequency oscillation component inhibits the oscillation of electromagnetic torque；It is made of two parts, one is frequency low-frequency oscillation component extraction list
Member, the second is the automatic virtual blocks unit for inhibiting electromagnetic torque to vibrate.Hunting of frequency component extraction unit is reasonable by setting
Cutoff frequency fw(its period is TW), so that the ripple components in frequency are by blocking filter, direct current component can not then lead to
It crosses, the frequency wave momentum without DC component can be obtained；Finally the low-frequency oscillation component is multiplied by damped coefficient D, and is added to
On electromagnetic torque, the additional damping to electromagnetic torque, rapid decay hunting power are formed.
Formula (6) is transmission function of the angular frequency after automatic virtual blocks, wherein ωtFor the angle after automatic virtual blocks
Frequency, fwFor cutoff frequency, TwFor its period, Tw=1/fw, s is complex frequency domain expression parameter.
TwValue be emphasis that this method is effectively realized, value should follow following principle:
1, guarantee that oscillating component passes through as far as possible；
2, as small as possible to the amplification of high frequency and to the advanced influence of oscillating component phase.
So TwValue it is unsuitable too small, prevent the oscillating component needed to be filtered out, also should not be too large, prevent phase super
It is preceding excessive.
By system according to track it is found that with TwContinuous increase, the pole of system first far from rear close to the imaginary axis,
The point corresponding T farthest from the imaginary axiswValue be optimal solution.Then with TwFurther increase, characteristic root is gradually crossed the imaginary axis and is arrived
Positive axis, system unstability.Obvious TwNot unstability value range need rationally to be selected according to the solution of the characteristic equation of system
It selects, is just able to achieve TwThe inhibition to oscillation can be achieved in a wider range, this has obvious valence in practical applications
Value.
Automatic virtual blocks link in the embodiment of the present invention only works when each unit internal frequency has differences,
It does not work at steady state, therefore, effectively enhances the power-sharing effect in system dynamic course, and reduce
Its influence to systematic steady state performance.
Vibratory stimulation based on virtual impedance inhibits principle
The theoretical analysis it is found that the excitation of oscillation of power be by instantaneous power increment not divide equally cause, i.e., when meet such as
When following formula (7), just there is instantaneous power increment to divide equally, wherein XtFor substitutional connection impedance (including the inversion of inverter to PCC point
Device equivalent output impedance, inverter export filtering impedance and line impedance), J is the virtual inertia of virtual synchronous inverter.
Inertia size and the disproportionate excitation for resulting in oscillation of power of line impedance, if changing line impedance, make its with
Inertia meets formula (7) relationship, can greatly weaken the generation of excitation.However, change line impedance obviously it is unrealistic and without
Ji, therefore the embodiment of the present invention proposes virtual impedance mode as shown in Figure 4 to inhibit the excitation of oscillation of power.
So that the substitutional connection impedance of inverter to PCC point meets formula (7), so that having makes after virtual impedance is added
:
ΔP1∶ΔP2=PJ1∶PJ2 (8)
Wherein Δ P1, Δ P2For inverter output power variable quantity caused by load fluctuation, PJ1, PJ2It is used for virtual synchronous
Property regulation power.
Specific implementation principle of the virtual impedance in Fig. 4 is as shown in Figure 5:
Traditional virtual synchronous inverter output voltage PWM modulation signal is first carried out to the change under three-phase to two-phase α β coordinate
It changes, then introduces virtual impedance.So that traditional virtual synchronous inverter output voltage modulated signal is plus above virtual impedance
Pressure drop (namely detection electric current multiplied by virtual impedance).To obtain by the PWM under virtual impedance α β coordinate system adjusted
Then modulated signal voltage is carried out the inverse transformation of two-phase α β to three-phase abc again, be converted under tri- phase coordinate system of ABC
Voltage eoa, eob, eoc。
Obviously, by adjusting virtual impedance Lvs1And Lvs2Value, i.e., changeable inverter equivalent output impedance, to change
Substitutional connection impedance X of the change inverter to PCC pointt, and then realize that instantaneous power increment divides equally condition, realize vibratory stimulation
Effectively inhibit.
PCC point voltage estimate Method And Principle
After virtual impedance is added, so that system is provided with following advantage: induction reactance is much larger than impedance, and active reactive, which is realized, to be understood
Coupling；It is unbalanced to weaken the instantaneous power as caused by J is different, to weaken the excitation of oscillation of power.But also result in nothing
There are original reason errors for function calculating, i.e., contain void according to the reactive power that traditional virtual synchronous inverter control algolithm calculates
Reactive loss in quasi- impedance, this will further result in idle dividing equally and is difficult to realize；Furthermore increased virtual impedance will make
It is more to obtain port voltage decline, the increase of PCC point scope range of the fluctuation of voltage.
As shown in formula (9).
Qout1 *-Qout2 *=-Dq *(E1 *-E2 *) (9)
Wherein Qoutl *, Qout2 *Respectively indicate the per unit value of two inverter output reactive powers；Dq *Indicate that inverter is idle
The per unit value of sagging coefficient；E1 *, E2 *Respectively indicate the per unit value of the respective voltage magnitude of idle feed back input of two inverters；
Work as E1 *, E2 *When deviation is larger, Qoutl *, Qout2 *Also having relatively large deviation namely reactive power cannot achieve respectively.
To alleviate this problem, the embodiment of the present invention has done corresponding improvement.The deviation of virtual synchronous inverter fed voltage
It is an important factor for causing reactive power not divided equally.Therefore, increase the prediction of busbar voltage link as shown in Fig. 4, as far as possible
The voltage magnitude for detecting inverter close to PCC point voltage value, thus weaken because voltage it is different caused by it is idle do not divide equally and
The excessive problem of PCC point scope range of the fluctuation of voltage, inside modules working principle are as shown in Figure 6:
The three-phase voltage that first will test carries out the transformation under three-phase to two-phase α β coordinate, then adds equivalent impedance
XtPressure drop (namely detection electric current is multiplied by inverter to the equivalent impedance of pcc point) above, to obtain repairing under α β coordinate system
Then positive voltage obtains V using amplitude detection link (amplitude detecting)bus, amplitude detection link specifically wraps
It includes and the amendment voltage under α β coordinate is first subjected to inverse transformation, the PCC point approximate estimation voltage being converted under tri- phase coordinate system of abc
va, vb, vc, then PCC point voltage magnitude V is obtained using formula (10)buso
Furthermore, it is necessary to which synchronous replace with formula (10) for the calculating of the Q in traditional virtual synchronous inverter control algolithm
In formula, Q indicates inverter potential output reactive power；ia, ib, icFor the output electric current of inverter.
Obviously, the advantage of this method is not only in that maintaining traditional virtual synchronous inverter does not need to survey inverter outlet
Voltage need to only survey the advantage of inverter output current, and divide equally in the stabilization of PCC point voltage and reactive power and have one
Fixed promotion.
Obviously, can be smaller due to the brings voltage deviation problem such as virtual impedance by the estimation to PCC point voltage,
Further weaken the influence for dividing equally accuracy to reactive power.
The embodiment of the present invention also provides a kind of computer storage medium, is stored thereon with virtual inverter control algorithm,
Processor can realize above-mentioned control method when executing the virtual inverter control algorithm.
In summary, the embodiment of the present invention provides a kind of virtual synchronous inverter control method that can inhibit active oscillation
And storage medium, mainly in former virtual synchronous inverter control algorithm module, three-phase inversion bridge module and PWM drive module base
On plinth, increases virtual impedance module, newly-increased automatic virtual blocks module and newly-increased prediction of busbar voltage link newly and constitute.The structure energy
Tradition void when enough effectively overcoming load fluctuation in terms of the inhibition of vibratory stimulation and enhancing synchronous inverter itself damp two
The problem of quasi- synchronous inverter active power oscillations.Prediction of busbar voltage link is used to improve the dividing equally property of reactive power of system
Energy.
When system loading fluctuates, angular frequency inside former virtual synchronous inverter control algorithm module output algorithm
As the input signal of automatic virtual blocks module, automatic virtual blocks output signal is sent to former virtual synchronous inverter control algorithm mould
Real power control ring in block realizes the damping of lifting system under the premise of not changing systematic steady state performance, to rapidly deplete
Oscillation energy makes each virtual synchronous inverter angular speed reach consistent；
Meanwhile the voltage modulation signal of former virtual synchronous inverter control algorithm module output and the inverter detected
Input signal of the electric current as virtual impedance module is exported, new voltage modulation signal is exported and gives PWM drive module, realize function
Effective inhibition of rate vibratory stimulation；
Again, the inverter output voltage amplitude detected is as prediction of busbar voltage link input signal.And it is its is defeated
Signal gives former virtual synchronous inverter control algorithm module out, so that the close practical PCC point voltage value of inverter detected amplitude,
The idle problem that do not divide equally and PCC point scope range of the fluctuation of voltage is excessive caused by weaken because of voltage difference.
Claims (8)
1. a kind of virtual synchronous inverter control method that can inhibit active oscillation characterized by comprising
A, on the active power controller ring of virtual synchronous inverter control algorithm, automatic virtual blocks control algolithm is added, by mentioning
Frequency low-frequency oscillation component is taken, active power controller ring electromagnetic torque is adjusted, reduces the difference of machine torque and electromagnetic torque, makes
The variable quantity of angular frequency reduces, to weaken the active oscillation of virtual synchronous inverter；
B, on the Reactive Power Control ring of virtual synchronous inverter control algorithm, virtual impedance control algolithm is added, adjusts nothing
Function power control loop output voltage modulated signal, the equivalent inductive reactance of change virtual synchronous inverter to PCC point, so that virtual synchronous
The equivalent inductive reactance of inverter to PCC point is greater than line impedance, reduces the coupling of active power and reactive power, realizes instantaneous power
Increment divides equally condition, to inhibit the excitation of the virtual synchronous inverter active oscillation；
C, the active oscillation for inhibiting the virtual synchronous inverter is realized by step a and step b.
2. the virtual synchronous inverter control method according to claim 1 that can inhibit active oscillation, which is characterized in that
Virtual impedance control algolithm is added in step b and then PCC point busbar voltage estimating algorithm is added, makes virtual synchronous inverter
The voltage magnitude of detection is close to PCC point voltage value.
3. the virtual synchronous inverter control method according to claim 1 or 2 that can inhibit active oscillation, feature exist
In extraction frequency low-frequency oscillation component in the step a, comprising: setting cutoff frequency, so that the ripple components in frequency pass through
Blocking filter obtains the frequency wave momentum without DC component so that direct current component can not pass through.
4. the virtual synchronous inverter control method according to claim 3 that can inhibit active oscillation, which is characterized in that institute
Stating automatic virtual blocks control algolithm includes frequency wave momentum by described without DC component multiplied by damped coefficient, and is added to electromagnetism and turns
On square, the additional damping to electromagnetic torque, damping power oscillations are formed.
5. the virtual synchronous inverter control method according to claim 1 that can inhibit active oscillation, which is characterized in that institute
Stating virtual impedance control algolithm includes:
Virtual synchronous inverter output voltage PWM modulation signal is first carried out to the transformation under three-phase to two-phase α β coordinate；
Then virtual impedance is introduced, adds the pressure drop above virtual impedance with virtual synchronous inverter output voltage modulated signal,
It obtains by the PWM modulation signal voltage under virtual impedance α β coordinate system adjusted；
The inverse transformation under two-phase α β to three-phase abc coordinate system is finally carried out, the voltage being converted under tri- phase coordinate system of abc passes through
The value of virtual impedance is adjusted, changes virtual synchronous inverter equivalent output impedance, to change virtual synchronous inverter to PCC point
Substitutional connection impedance.
6. the virtual synchronous inverter control method according to claim 2 that can inhibit active oscillation, which is characterized in that institute
Stating PCC point busbar voltage estimating algorithm includes:
The three-phase voltage that first virtual synchronous inverter is detected carries out the transformation under three-phase to two-phase α β coordinate, then add etc.
Imitate impedance XtPressure drop above obtains the amendment voltage under α β coordinate system, obtains PCC point voltage amplitude using amplitude detection link
Value Vbus；
The calculating formula of the Q in virtual synchronous inverter control algorithm is replaced with into formula (11) simultaneously,
In formula, Q indicates inverter potential output reactive power, ia,ib,icFor the output electric current of inverter, eoa, eob, eocIt is three
Voltage under phase coordinate system.
7. the virtual synchronous inverter control method according to claim 6 that can inhibit active oscillation, which is characterized in that institute
Amplitude detection link is stated to specifically include:
The amendment voltage under α β coordinate is first subjected to inverse transformation, the PCC point approximate estimation voltage being converted under tri- phase coordinate system of abc
va,vb,vc, then PCC point voltage magnitude V is obtained using formula (10)bus；
8. a kind of computer storage medium is stored thereon with virtual synchronous inverter control algorithm, which is characterized in that in processor
Method described in claim 1~7 any one can be realized when executing the virtual synchronous inverter control algorithm.
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