CN108448643A - The virtual synchronous machine motor synchronizing based on current resonance is incorporated into the power networks control method under unbalanced power grid - Google Patents
The virtual synchronous machine motor synchronizing based on current resonance is incorporated into the power networks control method under unbalanced power grid 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
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- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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Abstract
It is incorporated into the power networks control method the invention discloses the virtual synchronous machine motor synchronizing based on current resonance under a kind of unbalanced power grid, it is for there are negative sequence components to cause output voltage that can not accurately track network voltage in the virtual synchronous machine output current under unbalanced power grid under traditional virtual synchronous machine control strategy, the problem of cannot achieve motor synchronizing operation, by will be combined with the motor synchronizing control method for balancing virtual synchronous machine under power grid based on current resonance compensation method.The present invention without network voltage electric current positive-negative sequence under the premise of detaching, by eliminating two frequency multiplication flutter components in virtual current in synchronous rotating frame, to make inverter side voltage accurately track grid side voltage, realize that motor synchronizing of the virtual synchronous machine under unbalanced power grid is grid-connected；After grid-connected success, for the present invention by the way that the power control quantity of virtual synchronous machine control module is changed to actual power, resonance compensation amount is changed to actual current, realizes and is accurately controlled to electric current under unbalanced power grid.
Description
Technical field
The invention belongs to power electronics fields, and in particular to based on the virtual of current resonance under a kind of unbalanced power grid
Synchronous machine motor synchronizing is incorporated into the power networks control method.
Background technology
With becoming increasingly conspicuous for energy crisis and environmental problem, distributed generation technology is more and more used, and
Important equipment of the net inverter as distributed generation resource access power distribution network (micro-capacitance sensor), the further investigation of function and control strategy
Extensive attention is obtained.Conventional gird-connected inverter has the characteristics that fast response time, low inertia, underdamping, it is difficult to participate in
Power grid is adjusted, and since grid stability caused by the access of a large amount of new energy reduces, how real by controlling gird-connected inverter
Existing friendly access becomes urgent problem to be solved.For this purpose, having the control strategy that scholar proposes virtual synchronous machine, i.e., by parallel network reverse
Device is modeled to a synchronous motor with certain inertia and damping, realizes the friendly access of distributed generation resource with this and improves electricity
Force system stability.
VISMA (Virtual Synchronous Machine) and synchronous converter device are two kinds of realizations of virtual synchronous machine
Mode, the former calculates the reference value of inverter current using the mathematical model of conventional synchronization machine, and then controls output current, table
It is now controlled current source；The latter generates inverter output voltage using the mathematical model of conventional synchronization machine and instructs, and then controls and become
The output voltage for flowing device, shows as controlled voltage source.Since current power system is that voltage source is leading, large-scale current source
Access may bring stability problem, because this latter becomes the main realization method of current virtual synchronous machine.The first generation synchronizes
Current transformer needs special synchronization unit and realizes that synchronization, such as phaselocked loop be to obtain the information such as network voltage, frequency plot
Most common synchronization unit, but non-linear existing for phaselocked loop itself and delay defect can influence the performance and stabilization of system
Property.There is scholar to propose the control strategy of motor synchronizing current transformer thus, i.e., it is grid-connected it is preceding pass through internal control algorithm realize with electricity
Net synchronizes；The principle of motor synchronizing link is to choose one to enter to hold virtual impedance similar in inductance and resistance value with actual circuit,
According to grid side voltage, inverter side voltage and virtual resistance value find out a virtual current.When this virtual current is controlled as
When zero, it is synchronized to illustrate that grid side voltage and inverter survey voltage, to realize that motor synchronizing is grid-connected, motor synchronizing current transformer can be with
Rectification and inversion both of which are operated in, the complexity of system is greatly reduced, improves system stability.However, having void
Quasi- synchronous machine motor synchronizing control strategy can only be run in the case where balancing power grid, and in unbalanced source voltage, what is be calculated is virtual
Electric current equally exists negative sequence component, so as to cause there are two harmonics, traditional virtual synchronous machine to control plan in virtual power
Slightly two harmonics cannot be accurately tracked；Network voltage cannot be accurately tracked by obtaining inverter side voltage using conventional method,
To cause grid-connected current excessive when grid-connected, grid-connected failure；Therefore, research under unbalanced power grid virtual synchronous machine from same
It is significant to walk control strategy.
Invention content
In view of above-mentioned, the present invention provides the virtual synchronous machine motor synchronizings based on current resonance under a kind of unbalanced power grid simultaneously
Network operation control method, the positive-negative sequence without network voltage, electric current detaches, and control structure very simple, can be in imbalance
Realize that the motor synchronizing of virtual synchronous machine is incorporated into the power networks under power grid.
The virtual synchronous machine motor synchronizing based on current resonance is incorporated into the power networks control method under a kind of unbalanced power grid, including such as
Lower step：
(1) the three-phase power grid voltage U of gird-connected inverter is acquiredgabcWith three phase network electric current IgabcAnd the two is carried out respectively
Clark is converted, and correspondence obtains the network voltage vector U under static alpha-beta coordinate systemgαβWith power network current vector Igαβ；
(2) according to network voltage vector UgαβAnd the modulation voltage vector U of upper controlling cycle gird-connected invertercαβ *Meter
Calculate the virtual current vector I of gird-connected invertervαβ；
(3) power network current vector I is utilizedgαβ, network voltage vector UgαβWith virtual current vector IvαβCalculate parallel network reverse
The virtual active-power P of devicevWith virtual reactive power QvAnd active power of output PgWith output reactive power Qg；
(4) respectively to power network current vector IgαβWith virtual current vector IvαβRotating coordinate transformation is synchronized, to deserved
Power network current vector I under rotation d-q coordinate systemsgdqWith virtual current vector Ivdq；
(5) according to target active-power PselWith target reactive power QselIt is calculated and is determined by conventional synchronization machine controlling unit
The alternating voltage amplitude U of gird-connected invertercAnd phase thetac；Before grid-connected, Psel=Pv, Qsel=Qv；After grid-connected, Psel=Pg, Qsel=
Qg；
(6) to target current control vector IdqselResonance control is carried out, the compensation of gird-connected inverter alternating voltage is calculated
The d axis components U of vectorcdcompWith q axis components Ucqcomp；Before grid-connected, Idqsel=Ivdq；After grid-connected, Idqsel=Igdq；
(7) make the d axis components U of gird-connected inverter alternating voltage reference vectorcdWith q axis components UcqRespectively with UcdcompWith
UcqcompIt is added, wherein Ucd=Uc, Ucq=0；And then utilize phase thetacRotating Transition of Coordinate is carried out to result after being added, is obtained
Modulation voltage vector U under the static alpha-beta coordinate system of current control periodcαβ, finally utilize SVPWM (space vector pulse width modulation)
Algorithm construction goes out one group of pwm signal to control grid-connection converter.
Further, the virtual current vector I of gird-connected inverter is calculated in the step (2) according to following formulavαβ：
Wherein：IvαAnd IvβRespectively virtual current vector Ivαβα axis components and beta -axis component, UgαAnd UgβRespectively power grid
Voltage vector Ugαβα axis components and beta -axis component, Ucα *And Ucβ *Respectively modulation voltage vector Ucαβ *α axis components and β axis point
Amount, LvAnd RvRespectively gird-connected inverter enters the equivalent inductance and equivalent resistance of end line, and s is Laplace operator.
Further, the virtual active-power P of gird-connected inverter is calculated in the step (3) according to following formulavAnd void
Quasi- reactive power QvAnd active power of output PgWith output reactive power Qg：
Wherein：UgαAnd UgβRespectively network voltage vector Ugαβα axis components and beta -axis component, IgαAnd IgβRespectively power grid
Current phasor Igαβα axis components and beta -axis component, IvαAnd IvβRespectively virtual current vector Ivαβα axis components and beta -axis component.
Further, the alternating voltage amplitude U for determining gird-connected inverter is calculated in the step (5) according to following formulac
And phase thetac：
Wherein：Uc(k+1) and θc(k+1) be respectively in+1 controlling cycle of kth the alternating voltage amplitude of gird-connected inverter and
Phase, ωc(k) and ωc(k+1) it is respectively gird-connected inverter alternating voltage in+1 controlling cycle of k-th of controlling cycle and kth
The angular velocity of rotation of vector, Psel(k) and Qsel(k) be respectively gird-connected inverter in k-th of controlling cycle target active power
With target reactive power, PrefAnd QrefRespectively the active power reference value of gird-connected inverter and reactive power reference qref are (grid-connected
Before be given as 0, set according to actual needs after grid-connected), ωrefFor given angular velocity of rotation reference value, D and J are respectively grid-connected
The automatic virtual blocks setting value of inverter and virtual inertia setting value, K are the proportionality coefficient of setting, and t is the time and t=kT, T are control
The size in period processed, k are the natural number more than 0.
Further, gird-connected inverter alternating voltage compensation vector is calculated according to following formula in the step (6)
D axis components UcdcompWith q axis components Ucqcomp；
Wherein：CSOGI(s) it is the transmission function of resonant controller, IdselAnd IqselRespectively target current controls vector
IdqselD axis components and q axis components, ωcFor the cutoff frequency of resonant controller, ksFor the resonance coefficient of resonant controller, ωs
For twice of electrical network angular frequency, that is, ωs=4 π f, f are mains frequency, and s is Laplace operator.
Virtual synchronous machine output electricity of the present invention under traditional virtual synchronous machine control strategy under unbalanced power grid
There are negative sequence components to cause output voltage that can not accurately track network voltage in stream, cannot achieve the problem of motor synchronizing is run, examines
Direct resonance compensation is added in the reference voltage that virtual synchronous machine generates in worry, by by the resonance compensation method based on electric current and
The motor synchronizing control method of virtual synchronous machine is combined under balance power grid, and then is proposed one kind and be based on suitable for unbalanced power grid
The virtual synchronous machine motor synchronizing progress control method of current resonance.The method of the present invention is detached without network voltage electric current positive-negative sequence
Under the premise of, by directly eliminating the negative sequence component in virtual current so that inverter side voltage accurately tracks electricity before grid-connected
Net voltage realizes motor synchronizing operation control of the virtual synchronous machine under unbalanced power grid, after grid-connected success, by will be virtually same
The controlled quentity controlled variable of step machine control module is changed to actual power, and resonance compensation module controlled quentity controlled variable is changed to actual current, realizes the control plan
Slightly electric current is accurately controlled under unbalanced power grid.
Description of the drawings
Fig. 1 is the grid connected structure schematic diagram of virtual synchronous machine (gird-connected inverter).
Fig. 2 is the system control block figure of the method for the present invention.
Fig. 3 be traditional virtual synchronous machine motor synchronizing control strategy under network voltage it is single-phase fall 20% unbalanced power grid
Under it is grid-connected when dynamic response oscillogram；Wherein, UerralphaAnd UerrbetaRespectively between network voltage and inverter side voltage
Error α axis components and beta -axis component, grid-connected switch closure after, in order to observe the dynamic response of power, voltage error is cut
It is changed to active and reactive power P and Q, IgabcFor three phase network electric current.
Fig. 4 is that the present invention is based on the virtual synchronous machine motor synchronizing of the current resonance systems that is incorporated into the power networks to fall network voltage is single-phase
Dynamic response oscillogram when falling grid-connected under 20% unbalanced power grid；Wherein, UerralphaAnd UerrbetaRespectively network voltage
The α axis components and beta -axis component of error between inverter side voltage, after grid-connected switch closure, in order to observe the dynamic of power
State responds, and voltage error is switched to active and reactive power P and Q, IgabcFor three phase network electric current.
Fig. 5 be traditional virtual synchronous machine motor synchronizing control strategy under network voltage it is single-phase fall 20% unbalanced power grid
Under active 1000W when being incorporated into the power networks, the stable state waveform figure under idle 1000Var reference values setting；Wherein, P and Q are respectively virtual
Active and reactive power when synchronous machine actual motion, IgabcFor three phase network electric current.
Fig. 6 is that the present invention is based on the virtual synchronous machine motor synchronizing of the current resonance systems that is incorporated into the power networks to fall network voltage is single-phase
Active 1000W when being incorporated into the power networks, the stable state waveform figure under idle 1000Var reference values setting are fallen under 20% unbalanced power grid；
Wherein, active and reactive power when P and Q is respectively virtual synchronous machine actual motion, IgabcFor three phase network electric current.
Specific implementation mode
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and specific implementation mode is to technical scheme of the present invention
It is described in detail.
Fig. 1 is that the grid connected structure of virtual synchronous machine is illustrated, and the present invention is based on the virtual synchronous machine motor synchronizings of current resonance simultaneously
Network operation system is realized as shown in Fig. 2, system includes a voltage source type converter being connected with power grid 1, for detecting three-phase
The voltage hall sensor 2 of network voltage, the current Hall sensor 3 for detecting three phase network electric current, current resonance compensation
Device 4, two-phase rotary/static coordinate transformation module 5, two-phase be static/it rotating coordinate transformation module 6, SVPWM signal generators 7, uses
In the three-phase/two-phase static coordinate conversion module 8, the void that obtain the network voltage in two-phase stationary coordinate system, current phasor signal
Quasi- current calculation module 9, power computation module 10, the virtual synchronous machine control model for determining grid-connected front and back target control amount
Selecting module 11 and traditional synchronous motor Feedback of Power controlling unit 12.
As shown in Fig. 2, the virtual synchronous machine motor synchronizing progress control method the present invention is based on current resonance includes following step
Suddenly：
(1) three-phase voltage Hall sensor 2 is utilized to acquire the three-phase power grid voltage U of virtual synchronous machinegabcSignal utilizes electricity
It flows Hall sensor 3 and acquires three phase network electric current IgabcSignal, while acquiring the inversion being calculated in a controlling cycle
Device modulation voltage vector Ucαβ *。
(2) the three-phase power grid voltage U that will be collectedgabcSignal and three phase network electric current IgabcSignal is arrived through static three-phase
Two-phase coordinate transformation module 8 obtains the network voltage vector U under static alpha-beta coordinate systemgαβWith power network current vector Igαβ；With electricity
For net voltage, the expression formula from static three-phase to two-phase coordinate transform is：
(3) according to the network voltage vector U collectedgαβ, upper controlling cycle gird-connected inverter modulation voltage vector
Ucαβ *And virtual impedance value RvAnd Lv, virtual current vector I is calculated by virtual current computing module 9vαβ；Virtual current
Calculation expression is：
(4) the virtual current vector I for utilizing step (3) to be calculatedvαβThe obtained electricity of α, beta -axis component and step (2)
Net voltage vector Ugαβα, beta -axis component, virtual power P is calculated by power computation module 10v、Qv；It is obtained using step (2)
The network voltage vector U arrivedgαβα, beta -axis component and power network current vector Igαβα, beta -axis component, pass through power computation module 10
Power grid actual power P is calculatedg、Qg；The virtual current vector I that gained step (3) is calculatedvαβIt is calculated with step (2)
Obtained power network current vector IgαβBy two-phase it is static/rotating coordinate transformation module 6 synchronizes rotating coordinate transformation and obtains void
Quasi- electric current d, q axis component Ivd、IvqWith power network current d, q axis component Igd、Igq；By four pairs of calculated values input control mould obtained as above
Formula selecting module 11；Wherein virtual active and reactive power and practical active and reactive power calculation expression are：
Two-phase is static/and rotating coordinate transformation expression formula is as follows, θ in formulacFor gained inverter side voltage phase in step (6)
Position：
(5) virtual synchronous machine control model selecting module 11 determines the input of synchronous motor Feedback of Power controlling unit 12
The selection of controlled quentity controlled variable and the input offset amount of current resonance compensator 4.Before grid-connected, selected by control model selecting module 11
The virtual power P being calculatedv、QvAs power control quantity Psel、Qsel, select virtual current d, q axis component Ivd、IvqAs electricity
Flow control amount Idsel、Iqsel, realize that virtual power accurately tracks reference value 0, virtual current negative sequence component directly eliminated, to make
Inverter side voltage accurately tracks grid side voltage, realizes that motor synchronizing is grid-connected；Virtual synchronous machine wattful power during motor synchronizing
Rate reference value PrefWith reactive power reference qref QrefIt is given as zero；After grid-connected success, selected by virtual synchronous machine control model
Module 11 is selected by actual power Pg、QgAs power control quantity P at this timesel、Qsel, select actual current d, q axis component Igd、Igq
As current control amount Idsel、Iqsel, electric current is accurately controlled under unbalanced power grid to realize.
(6) the target power value P that will be selected by control model selecting module 11sel、QselWith power given value Pref、QrefWith
And given angular velocity of rotation ωrefInput synchronous motor Feedback of Power controlling unit 12, obtains inverter side voltage magnitude UcWith
Phase thetac, wherein voltage magnitude UcIt is inverter side voltage reference value d axis components U under voltage oriented synchronous coordinate systemcd,
Inverter side voltage reference value q axis components UcqIt is given as 0；Inverter side voltage magnitude UcAnd phase thetacCalculation expression such as
Under：
From the above equation, we can see that according to the target active and reactive power signal P of current control periodsel(k)、Qsel(k) and inversion
Device side voltage rotates angular frequencyc(k) next control week can be calculated in the error signal of the respective reference value corresponded to
The inverter side voltage magnitude U of phasec(k+1) and voltage vector rotates angular frequencyc(k+1), diagonal frequencies, which are integrated, obtains
Inverter side voltage phase angle θc(k+1)。
(7) virtual pulsating current given value 0, by the current control amount I of itself and step (6) selectiondsel、IqselIt is poor to make, and obtains
Pulsating current error signal, then by a Second Order Generalized Integrator SOGI, that is, current resonance compensator 4, output obtains inversion
The d axis components U of device side voltage compensation valuecdcompWith q axis components Ucqcomp；The calculation formula of voltage compensation value is as follows：
Wherein, the transmission function of Second Order Generalized Integrator is：
(8) under conditions of grid voltage orientation, the inverter of the output of synchronous motor Feedback of Power controlling unit 12 is utilized
The voltage reference value d axis components U of sidecdWith the voltage reference value q axis components U for the inverter side for being given as 0cqAnd it is humorous by electric current
The voltage compensation value U that the compensator 4 that shakes obtainscdcomp、Ucqcomp, the two is added to obtain inverter side final voltage reference value d, q
Axis component Ucdf、Ucqf。
(9) the inverter side voltage phase angle θ that synchronous motor Feedback of Power controlling unit 12 exportscTo being obtained by step (8)
The inverter side voltage reference value U arrivedcdf、UcqfInput two-phase rotary/static coordinate transformation module 5 is coordinately transformed, and is obtained
Modulation voltage vector U under static alpha-beta coordinate systemcαβ, as the input signal of SVPWM signal generators 7, and then utilize
SVPWM algorithm constructions are gone out one group of pwm signal and are controlled with pair voltage source type converter being connect with power grid 1.
As shown in figure 4, be incorporated into the power networks under control method in the virtual synchronous machine motor synchronizing the present invention is based on current resonance, this
Embodiment control system network voltage is single-phase fall 20% unbalanced power grid under, it is grid-connected before inverter side voltage with electricity
Error alpha, beta -axis component U between net voltageerralphaAnd UerrbetaCompared under traditional virtual synchronous machine motor synchronizing control in Fig. 3
Fluctuating error be obviously reduced, illustrate the method for the present invention can effectively inhibit it is grid-connected before inverter side voltage and power grid electricity
Error between pressure.When being incorporated into the power networks, present embodiment control system is compared to virtual synchronous machine motor synchronizing traditional in Fig. 3
Control effect, the method for the present invention can effectively inhibit grid-connected current, to avoid leading to grid-connected mistake since grid-connected current is excessive
The case where losing.
As shown in fig. 6, be incorporated into the power networks under control method in the virtual synchronous machine motor synchronizing the present invention is based on current resonance, this
Embodiment control system is fallen when 20% unbalanced power grid is incorporated into the power networks and active 1000W network voltage is single-phase, idle
Under the setting of 1000Var reference values, compared to virtual synchronous machine motor synchronizing control effect traditional in Fig. 5, current balance type and sine,
Negative sequence component therein is fully suppressed, and the two frequencys multiplication pulsation in active and reactive power is inhibited.
In conclusion the present invention is based on the virtual synchronous machine motor synchronizing of the current resonance control methods that is incorporated into the power networks to need electricity
Under the premise of net voltage and current positive-negative sequence detaches, so that it may to realize that motor synchronizing of the virtual synchronous machine under unbalanced power grid runs control
System, effectively inhibits the negative sequence component in power network current, three-phase balance and sine, while also inhibiting active and idle work(
Two frequency multiplication flutter components in rate, there is good control effect.
The above-mentioned description to embodiment can be understood and applied the invention for ease of those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (6)
1. the virtual synchronous machine motor synchronizing based on current resonance is incorporated into the power networks control method under a kind of unbalanced power grid, including as follows
Step：
(1) the three-phase power grid voltage U of gird-connected inverter is acquiredgabcWith three phase network electric current IgabcAnd Clark is carried out to the two respectively
Transformation, correspondence obtain the network voltage vector U under static alpha-beta coordinate systemgαβWith power network current vector Igαβ；
(2) according to network voltage vector UgαβAnd the modulation voltage vector U of upper controlling cycle gird-connected invertercαβ *It calculates simultaneously
The virtual current vector I of net invertervαβ；
(3) power network current vector I is utilizedgαβ, network voltage vector UgαβWith virtual current vector IvαβCalculate gird-connected inverter
Virtual active-power PvWith virtual reactive power QvAnd active power of output PgWith output reactive power Qg；
(4) respectively to power network current vector IgαβWith virtual current vector IvαβRotating coordinate transformation is synchronized, correspondence is revolved
Turn the power network current vector I under d-q coordinate systemsgdqWith virtual current vector Ivdq；
(5) according to target active-power PselWith target reactive power QselIt is grid-connected that determination is calculated by conventional synchronization machine controlling unit
The alternating voltage amplitude U of invertercAnd phase thetac；Before grid-connected, Psel=Pv, Qsel=Qv；After grid-connected, Psel=Pg, Qsel=Qg；
(6) to target current control vector IdqselResonance control is carried out, gird-connected inverter alternating voltage compensation vector is calculated
D axis components UcdcompWith q axis components Ucqcomp；Before grid-connected, Idqsel=Ivdq；After grid-connected, Idqsel=Igdq；
(7) make the d axis components U of gird-connected inverter alternating voltage reference vectorcdWith q axis components UcqRespectively with UcdcompAnd UcqcompPhase
Add, wherein Ucd=Uc, Ucq=0；And then utilize phase thetacRotating Transition of Coordinate is carried out to result after being added, is currently controlled
Modulation voltage vector U under period static alpha-beta coordinate systemcαβ, finally go out one group of pwm signal using SVPWM algorithm constructions with pair simultaneously
Net transformation device is controlled.
The control method 2. virtual synchronous machine motor synchronizing according to claim 1 is incorporated into the power networks, it is characterised in that：The step
(2) the virtual current vector I of gird-connected inverter is calculated according to following formulavαβ：
Wherein：IvαAnd IvβRespectively virtual current vector Ivαβα axis components and beta -axis component, UgαAnd UgβRespectively network voltage
Vector Ugαβα axis components and beta -axis component, Ucα *And Ucβ *Respectively modulation voltage vector Ucαβ *α axis components and beta -axis component, Lv
And RvRespectively gird-connected inverter enters the equivalent inductance and equivalent resistance of end line, and s is Laplace operator.
The control method 3. virtual synchronous machine motor synchronizing according to claim 1 is incorporated into the power networks, it is characterised in that：The step
(3) the virtual active-power P of gird-connected inverter is calculated according to following formulavWith virtual reactive power QvAnd output wattful power
Rate PgWith output reactive power Qg：
Wherein：UgαAnd UgβRespectively network voltage vector Ugαβα axis components and beta -axis component, IgαAnd IgβRespectively power network current
Vector Igαβα axis components and beta -axis component, IvαAnd IvβRespectively virtual current vector Ivαβα axis components and beta -axis component.
The control method 4. virtual synchronous machine motor synchronizing according to claim 1 is incorporated into the power networks, it is characterised in that：The step
(5) the alternating voltage amplitude U for determining gird-connected inverter is calculated according to following formulacAnd phase thetac：
Wherein：Uc(k+1) and θc(k+1) be respectively gird-connected inverter in+1 controlling cycle of kth alternating voltage amplitude and phase
Position, ωc(k) and ωc(k+1) it is respectively gird-connected inverter alternating voltage arrow in+1 controlling cycle of k-th of controlling cycle and kth
The angular velocity of rotation of amount, Psel(k) and Qsel(k) be respectively gird-connected inverter in k-th of controlling cycle target active power and
Target reactive power, PrefAnd QrefThe respectively active power reference value and reactive power reference qref of gird-connected inverter, ωrefFor
Given angular velocity of rotation reference value, D and J are respectively the automatic virtual blocks setting value of gird-connected inverter and virtual inertia setting value, K
For the proportionality coefficient of setting, the size in t is time and t=kT, T period in order to control, k is the natural number more than 0.
The control method 5. virtual synchronous machine motor synchronizing according to claim 1 is incorporated into the power networks, it is characterised in that：The step
(6) the d axis components U of gird-connected inverter alternating voltage compensation vector is calculated according to following formulacdcompWith q axis components
Ucqcomp；
Wherein：CSOGI(s) it is the transmission function of resonant controller, IdselAnd IqselRespectively target current control vector IdqselD
Axis component and q axis components.
The control method 6. virtual synchronous machine motor synchronizing according to claim 5 is incorporated into the power networks, it is characterised in that：The transmission
Function CSOGI(s) expression formula is as follows：
Wherein：ωcFor the cutoff frequency of resonant controller, ksFor the resonance coefficient of resonant controller, ωsFor twice of power grid angle
Frequency, that is, ωs=4 π f, f are mains frequency, and s is Laplace operator.
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| CN109742795A (en) * | 2019-01-10 | 2019-05-10 | 西北工业大学 | Single-phase grid-connected control method under virtual coordinate system based on SOGI |
| CN110198050A (en) * | 2019-07-01 | 2019-09-03 | 南瑞集团有限公司 | DFIG virtual synchronous control method based on the idle Collaborative Control of torque-under a kind of unbalanced power grid |
| CN111917128A (en) * | 2020-07-13 | 2020-11-10 | 浙江大学 | Virtual leakage inductance based doubly-fed wind power system voltage source self-synchronization control method |
| CN112187088A (en) * | 2020-09-08 | 2021-01-05 | 上海正泰电源系统有限公司 | Virtual synchronous machine-based unbalanced load control method |
| CN112838579A (en) * | 2021-01-25 | 2021-05-25 | 湖南工学院 | Analog synchronous generator virtual synchronous controller for improving system stability and robustness |
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| CN112187088A (en) * | 2020-09-08 | 2021-01-05 | 上海正泰电源系统有限公司 | Virtual synchronous machine-based unbalanced load control method |
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