CN106849184B - Asynchronous Wind turbines virtual synchronous grid-connected control method and system - Google Patents
Asynchronous Wind turbines virtual synchronous grid-connected control method and system 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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
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Abstract
The invention discloses be based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method and system, the generator that Wind turbines use is dual stator-winding induction generator, control winding on its stator connects control side inverter to realize effective control to entire generating set, and the power winding on stator connects uncontrollable rectifier bridge to DC bus transmission power.The control method of grid-connected inverter of Wind turbines uses virtual synchronous grid-connected control method, in the microgrid inverter control method based on virtual synchronous generator, quasi-synchronization paralleling algorithm is added, presynchronization control algolithm, virtual impedance algorithm based on Second Order Generalized Integrator, and use the space voltage vector modulation method based on quasi- ratio resonance algorithm.The present invention can be realized entire dual stator-winding induction wind power system efficient stable operation, and can automatically select grid-connected opportunity, make grid-connected moment non-impact current, realize that high-efficiency soft is grid-connected.
Description
Technical field
The present invention relates to a kind of grid-connected control methods of distributed micro-grid system, more particularly to are based on dual stator-winding induction
Wind turbines virtual synchronous grid-connected control method and system.
Background technique
Stator Dual stator-winding induction generator (Dual Stator-Winding Induction Generator, referred to as
DWIG brushless structure, structure simple rigid, brushless and slip ring) are used；Arrange double winding on stator, it is a set of for power around
Group, output are terminated with exciting capacity, rectifier, filter capacitor, export DC voltage；Another set of is control winding, is connected to static
Pwm converter, the capacity of this pwm converter only need 1/3 or so of power system capacity, idle as needed for converter offer system
Electric current can efficiently control the amplitude remaining constant of power winding output DC voltage using certain control strategy.This two
Winding number of pole-pairs having the same is covered, therefore its working frequency is also identical, they are to pass through magnetic electrically without any connection
It is coupled, it is possible to which influence of the high-frequency harmonic to power winding caused by reducing due to converter switches movement improves system
The Electromagnetic Compatibility and efficiency of system.
A large amount of theoretical and experiment all proves that DWIG possesses excellent in the independent electric power supply under high-speed cruising environment
Dynamic and static state performance, Given this research achievement, the characteristic and DWIG itself of output direct current are rectified in conjunction with the power winding side DWIG
Unique features and advantages, are applied in wind generator system, can have certain competitive advantage, be particularly suitable for sea
The direct current current collection transportation system of wind power plant.The DWIG wind generator system wind power system emerging as one, motor cost
It is cheap, brushless, can flexible weak magnetic, the excitation controller for only needing low capacity is run in wider revolving speed range of operation, and it is current
Most mainstream has brush double-fed to compare with direct-drive permanent-magnetism type, not only inherits the phase of both types of brush double-fed and direct-drive permanent-magnetism
Advantage is closed, some fatal disadvantages is also compensated for, is such as not easy weak magnetic, there is electric brush slip ring etc..As it can be seen that DWIG is used for wind-power electricity generation
With very big novelty and feasibility, there is broad prospect of application.
In conventional electric generators Grid-connected Control Strategy, microgrid inverter is usually controlled when being incorporated into the power networks with P/Q, and isolated island
It is controlled when operation with V/F, but this method is difficult to realize smoothly switching between different operational modes.For this problem, to improve
Receiving ability of the power grid to distributed generation resource, recent domestic and foreign scholars' proposition virtual synchronous generator techniques (Virtual
Synchronous Generator, abbreviation VSG), make distributed generation resource have the rotator inertia of synchronous generator, primary frequency modulation,
The characteristic of pressure regulation.How inverter in microgrid is effectively controlled, uses for reference the excellent of inheriting tradition Grid-connected Control Strategy
Gesture simultaneously develops the exclusive feature of virtual synchronous generator itself, how simultaneous with prime stator and double-rotor generator control strategy matching
Hold co-ordination, how to solve modulating wave aberration problems in virtual synchronous Grid-connected Control Strategy caused by busbar voltage fluctuation,
The dash current for how inhibiting grid-connected moment is the key that can virtual synchronous Grid-connected Control Strategy reliable efficient operation.This
It just needs those skilled in the art and solves corresponding technical problem.
Summary of the invention
Technical problem to be solved by the invention is to provide be based on dual stator-winding induction Wind turbines virtual synchronousization simultaneously
Network control method and system, the defect for improving the grid-connected algorithm of tradition develops the advantage of virtual synchronous algorithm, and makes virtual synchronous
Change grid-connected control method to be mutually matched with dual stator-winding induction Wind turbines control method, inhibits busbar voltage fluctuation to virtual
Synchronize the distortion for inhibiting virtual synchronous grid-connected control method output modulating wave while the influence that grid-connected control method generates
And the influence to generator side control algolithm, thus realize entire dual stator-winding induction wind power system efficient stable operation, and
And make output voltage vector fast track network voltage vector before grid side breaker, select appropriate grid-connected opportunity to make grid-connected moment
Non-impact current is, it can be achieved that high-efficiency soft is grid-connected.
The technical scheme to solve the above technical problems is that
On the one hand, the present invention provides be based on dual stator-winding induction Wind turbines virtual synchronous grid-connection control system,
The system comprises dual stator-winding induction Wind turbines and virtual synchronous control device, the dual stator-winding induction wind-powered electricity generation
Unit is electrically connected with the virtual synchronous control device.
The dual stator-winding induction Wind turbines specifically include stator double winding induction machine, exciting capacity, do not control it is whole
Flow bridge, filter capacitor, underloading, filter inductance, control side inverter, Power Diode Pumped, battery, motor side controller and drive
Dynamic circuit；
Power of motor side is sequentially connected electrically with the exciting capacity, uncontrollable rectifier bridge, filter capacitor, underloading, motor control
Side and the filter inductance, control side inverter, filter capacitor are sequentially connected electrically, and are connected with Power Diode Pumped and battery
Branch electrical connection acquires the voltage signal at uncontrollable rectifier bridge and the voltage signal at control side inverter and is sent into motor side control
Device processed acquires the current signal at filter inductance and is sent into driving circuit together with the output signal of the motor side controller,
The driving circuit is electrically connected with the control side inverter.
The virtual synchronous control device specifically include grid side inverter, LCL filter circuit, three-phase breaker, power grid,
Instantaneous power computing module, virtual synchronous engine controller, virtual impedance, quasi- ratio resonance dual-loop controller, space voltage
Vector modulator, presynchronization controller, quasi-synchronization paralleling controller, the side LCL phaselocked loop and grid side phaselocked loop；
The grid side inverter, LCL filter circuit, three-phase breaker, power grid are sequentially connected electrically, the grid side inversion
Device is electrically connected with the uncontrollable rectifier bridge, and the acquisition side LCL voltage signal is sent into the instantaneous power computing module, the instantaneous function
Rate computing module, virtual synchronous engine controller, quasi- ratio resonance dual-loop controller, space voltage vector modulation device successively connect
It connects, the virtual impedance, virtual synchronous engine controller, presynchronization controller, quasi-synchronization paralleling controller are sequentially connected, institute
The output end for stating space voltage vector modulation device is electrically connected with the grid side inverter.
On the other hand, the present invention provides be based on dual stator-winding induction Wind turbines virtual synchronous cutting-in control side
Method, using dual stator-winding induction Wind turbines to virtual synchronous control device transmission power；Using the current hysteresis of outer voltage
Ring control algolithm controls dual stator-winding induction Wind turbines, and the virtual synchronous control device is used based on using virtual synchronous
It is grid-connected to change Grid-connected Control Strategy realization.
Further, it include control winding and power winding on the stator of the dual stator-winding induction Wind turbines；
The power winding is connected with uncontrollable rectifier bridge, to DC bus transmission power, controls for the virtual synchronous
Device provides power supply；
The control winding side inverter is incuded using the current hysteresis-band control algorithm control stator double winding of outer voltage
Motor.
Further, the control winding side inverter is double using the current hysteresis-band control algorithm control stator of outer voltage
Winding induction motor specifically includes:
Motor side controller is according to fiducial value, the power winding of the voltage of control winding side and the voltage given value of control side
D, q axis is calculated to constant current, by direct field orientation in the fiducial value of the voltage given value of the voltage and power winding side of side
Orientation angle is obtained, generates the PWM switching drive signal of control side inverter switching tube, the control side inverter is according to
PWM switching drive signal controls stator double winding induction machine.
Further, the virtual synchronous control device, which uses, is based on realizing simultaneously using virtual synchronous grid-connected control method
Net specifically includes:
S1, the voltage and current instantaneous value exported using instantaneous power calculation method according to the inverter collected, meter
Calculation obtains active power and reactive power；
S2, the active power and reactive power are carried out using VSG control algolithm voltage modulated wave signal is calculated；
S3, the voltage modulated wave signal are compared with the voltage signal that virtual impedance module exports and input are calculated
Modulation wave signal, the voltage signal are to be calculated by the virtual impedance module according to inverter output current；
S4, double-closed-loop control device are calculated according to the input modulation wave signal, the voltage of inverter output and inductive current
Output is obtained with reference to modulation wave signal, and using the voltage signal as the modulation wave signal of PWM modulator；
S5, the PWM modulator obtain inverter modulated signal according to the reference modulation wave signal of the PWM modulator,
And output this to inverter.
S6, using presynchronization control algolithm, adjust when not grid-connected the output voltage and network voltage of LCL filter circuit
Waveform is overlapped.
S7, the switching signal that grid side breaker is issued using quasi-synchronization paralleling control algolithm, it is grid-connected to carry out.
Further, virtual impedance module described in the S3 is specially to be based on depression of order resonator and three rank Generalized Integrators
Cascade virtual impedance module.
Further, double-closed-loop control implement body described in the S4 is the humorous based on quasi- ratio of outer voltage current inner loop
The double-closed-loop control device of vibration.
Further, presynchronization control algolithm described in the S6 by two integral with it is active in VSG control algolithm
Sagging coefficient and idle sagging coefficient constitute two pi regulators, adjust LCL filtering by two pi regulators when not grid-connected
The output voltage of circuit is overlapped with the waveform of network voltage.
Further, to detect inverter respectively defeated by two phaselocked loops for quasi-synchronization paralleling control algolithm described in the S7
Amplitude, angular frequency and the phase of voltage and grid side voltage out, and judging inverter output voltage and grid side voltage amplitude
The difference of value and the difference of angular frequency are less than respective allowable error, and inverter output voltage phase and grid side voltage phase
When position is consistent, the switching signal of grid side breaker is issued.
Beneficial effects of the present invention:
1. dual stator-winding induction generator control method is combined with virtual synchronous grid-connected control method, algorithm
It is mutually matched, entire grid type dual stator-winding induction generator group is reliable for operation, and generator works in rated condition, runs feelings
Condition is good, and the high symmetry of grid side current sinusoidal degree is good.
2. generator side control algolithm uses current hysteresis-band control method, control algolithm is simple and efficient, and dynamic property is very
It is good, it is high in the stationarity of control effect Up Highway UHW voltage, so that the steady operation for rear class grid side inverter lays solid base
Plinth.
3. virtual synchronous grid-connected control method is introduced in Wind turbines control algolithm, traditional cutting-in control algorithm is improved
Off-network and it is grid-connected when need the defect of switching control algorithm, and grid-connected moment non-impact current may be implemented, so as to
It completes flexible grid-connected.
4. the virtual impedance based on Second Order Generalized Integrator is added in virtual synchronous grid-connected control method, can inhibit
The current deviation that load disturbance is formed, also it is possible to prevente effectively from because of the current waveform distortion that rear class control algolithm generates and to hair
The interference of motor side control algolithm also helps and realizes dividing equally for power between more synchronous inverters, makes entire stator double wrap
The asynchronous running of wind generating set of group is stablized.
5. the space voltage vector modulation based on quasi- ratio resonance is added in virtual synchronous grid-connected control method, use
The dual-loop controller method of quasi- ratio resonance is conducive to isolate the fundamental wave of modulating wave, is conducive to inhibit three phase unbalance current,
The sine degree and symmetry of power network current are improved, and fiber crops can be calculated to avoid because of coordinate transform bring needed for traditional algorithm
It is tired；Output voltage vector can be made quickly to track network voltage vector using space voltage vector modulation method, thus high-efficiency precision
Really complete working asynchronously for output voltage vector and network voltage vector.
6. presynchronization control algolithm is added in virtual synchronous grid-connected control method, it is defeated to constantly regulate grid side inverter
Voltage out is overlapped its output voltage waveforms after LCL filter circuit quickly with grid voltage waveform, calculates for quasi-synchronization paralleling
Method lays good basis.
7. quasi-synchronization paralleling algorithm is added in virtual synchronous grid-connected control method, constantly calculate grid side breaker
Preceding voltage compares with the amplitude of network voltage, frequency, phase, and open circuit is issued when the two reaches suitable grid-connected conditions
Device switching signal, dash current when being conducive to reduce grid-connected are realized flexible grid-connected.
Detailed description of the invention
Fig. 1 is of the invention whole based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method and system
Body block diagram；
Fig. 2 is of the invention based on dual stator-winding induction Wind turbines generator side control algolithm block diagram；
Fig. 3 is virtual synchronous grid-connected control method block diagram of the invention；
Fig. 4 is quasi-synchronization paralleling algorithm block diagram of the invention.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Embodiment 1 is based on dual stator-winding induction Wind turbines virtual synchronous grid-connection control system.Below with reference to Fig. 1
System provided in this embodiment is described in detail to Fig. 4.
Referring to Fig. 1 to Fig. 4, it is based on dual stator-winding induction Wind turbines virtual synchronous grid-connection control system, the system
System include dual stator-winding induction Wind turbines and virtual synchronous control device, the dual stator-winding induction Wind turbines with
The virtual synchronous control device electrical connection；The dual stator-winding induction Wind turbines, for being controlled for the virtual synchronous
Device transmission power.
Specifically, including stator double winding based on dual stator-winding induction Wind turbines virtual synchronous grid-connection control system
Induction machine (1), filter inductance (2), control side inverter (3), exciting capacity (4), uncontrollable rectifier bridge (5), grid side inversion
It is device (6), LCL filter circuit (7), three-phase breaker (8), power grid (9), motor side controller (10), driving circuit (11), instantaneous
Power computation module (12), virtual synchronous engine controller (13), virtual impedance (14), quasi- ratio resonator (15), space
Voltage vector modulator (16), the side LCL phaselocked loop (17), grid side phaselocked loop (18), presynchronization controller (19), the quasi- same period are simultaneously
Column controller (20), filter capacitor, Power Diode Pumped, battery, voltage sensor, current sensor.
Power of motor side is sequentially connected electrically with the exciting capacity, uncontrollable rectifier bridge, filter capacitor, underloading, motor control
Side and the filter inductance, control side inverter, filter capacitor are sequentially connected electrically, and are connected with Power Diode Pumped and battery
Branch electrical connection acquires the voltage signal at uncontrollable rectifier bridge and the voltage signal at control side inverter and is sent into motor side control
Device processed acquires the current signal at filter inductance and is sent into driving circuit together with the output signal of the motor side controller,
The driving circuit is electrically connected with the control side inverter.
The grid side inverter, LCL filter circuit, three-phase breaker, power grid are sequentially connected electrically, the grid side inversion
Device is electrically connected with the uncontrollable rectifier bridge, and the acquisition side LCL voltage signal is sent into the instantaneous power computing module, the instantaneous function
Rate computing module, virtual synchronous engine controller, quasi- ratio resonance dual-loop controller, space voltage vector modulation device successively connect
It connects, the virtual impedance, virtual synchronous engine controller, presynchronization controller, quasi-synchronization paralleling controller are sequentially connected, institute
The output end for stating space voltage vector modulation device is electrically connected with the grid side inverter.
Generator side uses the current hysteresis-band control algorithm of outer voltage, makes its that busbar voltage be kept to stablize, and to net side
Inverter output power, control algolithm are simple and efficient, and dynamic property is fine, to be the stabilization work of rear class grid side inverter
It takes a firm foundation；Net side inverter uses virtual synchronous grid-connected control method, makes output voltage before grid side breaker
Vector fast track network voltage vector selects appropriate grid-connected opportunity to make grid-connected moment non-impact current, passes it by generator
The defeated power to come is completed flexible grid-connected.And make virtual synchronous grid-connected control method and dual stator-winding induction Wind turbines
Control algolithm is mutually matched, to realize entire dual stator-winding induction wind power system efficient stable operation, generator is worked in
Rated condition operating condition is good, and the high symmetry of grid side current sinusoidal degree is good.
Embodiment 2 is based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method.Below with reference to Fig. 1
Method provided in this embodiment is described in detail to Fig. 4.
Referring to Fig. 1 to Fig. 4, it is based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method, using fixed
The duplex winding asynchronous Wind turbines of son are to virtual synchronous control device transmission power；Using the current hysteresis-band control algorithm of outer voltage
Dual stator-winding induction Wind turbines are controlled, the virtual synchronous control device is used based on using virtual synchronous cutting-in control
Strategy is realized grid-connected.
It include control winding and power winding on the stator of the dual stator-winding induction Wind turbines；The power winding
It is connected with uncontrollable rectifier bridge, to DC bus transmission power, provides power supply for the virtual synchronous control device；The control
Winding side inverter controls stator double winding induction machine using the current hysteresis-band control algorithm of outer voltage.
Specifically, the principle of dual stator-winding induction generator side control algolithm is as shown in Fig. 2, according to direct field orientation
Method phasor diagram it is found that control winding end voltage vector UsWith magnetic linkage ψsIt is almost vertical, if ignoring control winding impedance
Pressure drop, then such as formula (1) is shown under dq coordinate system for stator magnetic linkage and control winding end voltage:
Us≈∫ψsdt (1)
It is found that it can be by back-emf E by formula (1)sDue to q axis, by magnetic linkage ψsDue to d axis.Public affairs are obtained by instantaneous power theory
Formula (2):
Then control winding current phasor IsD axis component IsdThe magnetic linkage of adjusting control winding, and control winding current phasor
IsQ axis component IsqAdjust the active power of control winding；And the electromagnetic torque and magnetic linkage of DWIG control side are represented by formula
(3):
By the adjusting to control winding side instantaneous active power, may be implemented to electromagnetic torque TemsControl, and change
Reactive power then adjustable control winding magnetic linkage ψs, since two sets of stator winding are by generator magnetic field coupling, in turn
The internal magnetic field of entire generator can be implemented to control, stablize system output；To sum up, if ignoring inverter losses, ψs
With UsNear normal, and UsAdvanced ψs90 °, therefore herein by ψsDue to d axis, back-emf is scheduled into q axis, then control winding electricity
Flow vector IsD axis component IsdThe magnetic linkage of adjusting control winding, and IsQ axis component IsqAdjust the wattful power of control winding side
Rate.
Generator side current hysteresis-band control algorithm will control side voltage compared with controlling side given value, and error amount passes through PI
Adjuster is calculated as given q shaft current；By power side voltage compared with the given value of power side, error amount passes through pi regulator meter
Calculate is that d axis is given；Its orientation angle is calculated by direct field orientation；By d axis and q shaft current given value, direct field orientation
Angle generates switching signal with Hysteresis Current method after coordinate transform, controls generator through driving circuit.
The control winding side inverter is incuded using the current hysteresis-band control algorithm control stator double winding of outer voltage
Motor specifically includes: motor side controller is according to fiducial value, the function of the voltage of control winding side and the voltage given value of control side
D, q axis is calculated to constant current, by direct magnetic in the fiducial value of the voltage given value of the voltage and power winding side of rate winding side
Orientation obtains orientation angle, generates the PWM switching drive signal of control side inverter switching tube, the control side inverter according to
The PWM switching drive signal controls stator double winding induction machine.
Specifically as shown in Fig. 2, being illustrated in figure 2 dual stator-winding induction Wind turbines generator side control method principle
Figure, by power winding side DC bus-bar voltage instantaneous value UpDCWith given voltage value UpDC *Compare, difference is transported by pi regulator
It calculates, obtains control winding to the d axis component I of constant currentsd *, adjust IsdAnd then the quadergy inside motor is adjusted, to maintain
UpDCStabilization；Such as when bearing power impact, to make power side voltage UpDCIt maintains to stablize, then the electric current on exciting capacity at this time
Increase, then the idle increase that exciting capacity is provided to generator, then generator reduces from the reactive power that control side absorbs, then needs
Adjust IsdMake its reduction；Similarly, by control winding side DC bus-bar voltage instantaneous value UsDCWith reference voltage value UsDC *Compare, it is poor
Value passes through pi regulator operation, obtains control winding to the q axis component I of constant currentsq *, adjust IsqAnd then it adjusts inside motor
Active energy, to maintain UsDCStabilization；Such as when bearing power impact, control side needs to absorb more active energy and comes
Maintain UsDCStabilization, then need adjust IsqMake its increase；Further according to the orientation angle Θ that direct field oriented control obtains, in conjunction with
Isd *、Isq *Value, the given value of control winding three-phase current can be obtained；It is done what is be calculated to constant current and measured current
It is sent into Digital Hysteresis comparator after difference, obtains the PWM switching drive signal of control side inverter switching tube.
Principle is shown below:
The virtual synchronous control device is used based on using the realization of virtual synchronous grid-connected control method grid-connected, is specifically wrapped
Include following steps:
S1, the voltage and current instantaneous value exported using instantaneous power calculation method according to the inverter collected,
Active power and reactive power is calculated.
S2, the active power and reactive power are carried out that inverter output voltage is calculated using VSG control algolithm
Modulation wave signal.
Specifically, as shown in figure 3, the control method of grid-connected inverter based on virtual synchronous generator, has used for reference synchronous hair
The second order Classical Equation and governor and excitation controller of motor, devise VSG control algolithm, and math equation is as follows:
Wherein, Tset、TeFor given torque and electromagnetic torque；Pset、QsetIt is given for active and reactive power；Dp、DqTo have
Function-frequency and the sagging coefficient of idle-voltage；θ is electrical angle；Δ ω is that angular rate is poor, Δ ω=ωn-ω；ωn, ω be volume
Determine angular rate and practical angular rate；Δ u is that output voltage is poor, Δ u=un-uo；un、uoFor voltage rating virtual value and defeated
Voltage effective value out；J is rotary inertia；K is inertia coeffeicent.
Sample power grid three-phase voltage and three-phase current, calculate power grid consumption it is active and idle；By active given value Pset
With active value of feedback PeCompare, the angular frequency and angular frequency given value of sampling compare and multiplied by active sagging coefficient, result warps
Angular frequency output valve is obtained after inertial element, is integrated the phase Θ for remembering modulating wave at this time；It similarly will be idle given
Value QsetWith idle value of feedback QeCompare, the phase voltage amplitude of sampling and its given value compare and multiplied by idle sagging coefficient, knot
Fruit obtains phase voltage amplitude output valve after inertial element, and value is the phase voltage amplitude of modulating wave at this time；It so far, can be by
The output of active ring and idle ring generates three-phase modulations wave.
When not grid-connected, PsetAnd QsetIt is 0, in order to make the output voltage vector of grid side inverter through LCL filter circuit
After can accurately track power grid voltage vector, while in order to be overlapped its waveform with grid voltage waveform completely, in virtual synchronous
Change and presynchronization control method is added in grid-connected control method.
S3, the inverter output voltage modulation wave signal are compared meter with the voltage signal that virtual impedance module exports
Calculation obtains input modulation wave signal, and the voltage signal is to be calculated by the virtual impedance module according to inverter output current
It arrives.
The virtual impedance module is specially the virtual impedance module based on broad sense second-order integrator, optimization, the void
Quasi- impedance module is based on depression of order resonator and the cascade virtual impedance module of three rank Generalized Integrators.
The virtual impedance based on broad sense Second Order Integral, the calculation formula of lead angle such as following formula:
Zv=Rvvd(t)-ωLvvq(t) (7)
In above formula, RvFor virtual resistance, LvFor virtual inductor, to inhibit current change quantity caused by load disturbance and reality
Existing power is divided equally.
S4, double-closed-loop control device are calculated according to the input modulation wave signal, the voltage of inverter output and inductive current
Output is obtained with reference to modulation wave signal, and using the modulation wave signal as the reference voltage signal of PWM modulator.Specifically, institute
Stating double-closed-loop control implement body is the double-closed-loop control device based on quasi- ratio resonance.
S5, the PWM modulator obtain inverter modulated signal according to the reference voltage signal of the PWM modulator, and
Output this to inverter.
Based on the space voltage vector modulation of quasi- ratio resonance, using the double-closed-loop control based on quasi- ratio resonance (PR) come
Inhibit the imbalance and harmonic component of synchronous inverter output electric current, the U output itα、UβUsing space voltage vector modulation side
Formula can rapidly and accurately track power grid voltage vector.
S6, using presynchronization control algolithm, adjust when not grid-connected the output voltage and network voltage of LCL filter circuit
Waveform is overlapped.
Specifically, the presynchronization control algolithm by two integral with VSG control algolithm in active sagging coefficient and
Idle sagging coefficient constitutes two pi regulators, adjusts the output of LCL filter circuit by two pi regulators when not grid-connected
Voltage is overlapped with the waveform of network voltage.
When not grid-connected, PsetAnd QsetIt is 0, in order to make the output voltage vector of grid side inverter through LCL filter circuit
After can accurately track power grid voltage vector, while in order to be overlapped its waveform with grid voltage waveform completely, in virtual synchronous
Change and presynchronization control method be added in grid-connected control method, presynchronization control method principle is as follows:
As shown in above formula, in control algolithm be added two integral make its respectively with active sagging coefficient and idle sagging system
Number constitutes two pi regulators, the output voltage after LCL filter circuit is constantly regulate when not grid-connected, until making its waveform and electricity
Net voltage waveform is overlapped；Presynchronization control algolithm is that quasi-synchronization paralleling algorithm lays good basis, and need after grid-connected by
It cuts off, and active sagging coefficient and idle sagging coefficient are only left in control algolithm.
S7, the switching signal that grid side breaker is issued using quasi-synchronization paralleling control algolithm, it is grid-connected to carry out.
Specifically, the quasi-synchronization paralleling control algolithm detects inverter output voltage warp by two phaselocked loops respectively
With the amplitude of grid side voltage, angular frequency and phase after LCL filter, grid-connected behaviour is automatically begun to after meeting grid-connected conditions
Make.
It is illustrated in figure 4 quasi-synchronization paralleling algorithm principle figure, detects the output of net side inverter respectively by two phaselocked loops
The amplitude of voltage and grid side voltage, angular frequency, phase, judge whether its voltage magnitude error is less than allowable error εu=5%
ug, whether angular frequency error be less than allowable error range εω=0.3% ωg, detect inverter output voltage phase and network voltage
Whether angular frequency is consistent；The opportunity all met until detecting three grid-connected conditions then issues the combined floodgate letter of grid side breaker
Number, start grid-connected.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. being based on dual stator-winding induction Wind turbines virtual synchronous grid-connection control system, which is characterized in that the system packet
Include dual stator-winding induction Wind turbines and virtual synchronous control device, the dual stator-winding induction Wind turbines with it is described
The electrical connection of virtual synchronous control device；The dual stator-winding induction Wind turbines are used to be that the virtual synchronous control device is defeated
Send power；
The dual stator-winding induction Wind turbines specifically include stator double winding induction machine, exciting capacity, uncontrollable rectifier bridge,
Filter capacitor, underloading, filter inductance, control side inverter, Power Diode Pumped, battery, motor side controller and driving electricity
Road；
Power of motor side is sequentially connected electrically with the exciting capacity, uncontrollable rectifier bridge, filter capacitor, underloading, motor control side with
The filter inductance, control side inverter, filter capacitor are sequentially connected electrically, and the series arm with Power Diode Pumped and battery
Electrical connection acquires the voltage signal at uncontrollable rectifier bridge and the voltage signal at control side inverter and is sent into motor side control
Device acquires the current signal at filter inductance and is sent into driving circuit together with the output signal of the motor side controller, institute
Driving circuit is stated to be electrically connected with the control side inverter；
The virtual synchronous control device specifically includes grid side inverter, LCL filter circuit, three-phase breaker, power grid, instantaneous
Power computation module, virtual synchronous engine controller, virtual impedance, quasi- ratio resonance dual-loop controller, space voltage vector
Modulator, presynchronization controller, quasi-synchronization paralleling controller, the side LCL phaselocked loop and grid side phaselocked loop；
The grid side inverter, LCL filter circuit, three-phase breaker, power grid are sequentially connected electrically, the grid side inverter with
The uncontrollable rectifier bridge electrical connection, the acquisition side LCL voltage signal are sent into the instantaneous power computing module, the instantaneous power meter
Module, virtual synchronous engine controller, quasi- ratio resonance dual-loop controller, space voltage vector modulation device is calculated to be sequentially connected,
The virtual impedance, virtual synchronous engine controller, presynchronization controller, quasi-synchronization paralleling controller are sequentially connected, described
The output end of space voltage vector modulation device is electrically connected with the grid side inverter.
2. being based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method, which is characterized in that double using stator
Winding asynchronous Wind turbines are to virtual synchronous control device transmission power；It is controlled using the current hysteresis-band control algorithm of outer voltage
Dual stator-winding induction Wind turbines, the virtual synchronous control device are used based on using virtual synchronous Grid-connected Control Strategy
It realizes grid-connected；
The virtual synchronous control device is used based on using the realization of virtual synchronous Grid-connected Control Strategy grid-connected, is specifically included:
S1, the voltage and current instantaneous value exported using instantaneous power calculation method according to the inverter collected, are calculated
Obtain active power and reactive power；
S2, the active power and reactive power are carried out that virtual synchronous generator control is calculated using VSG control algolithm
The reference signal of device output voltage；
The virtual voltage of S3, the reference signal of the quasi- synchronous generator machine controller output voltage and the output of virtual impedance module are believed
It number is compared and reference-input signal is calculated, the virtual voltage signal is by the virtual impedance module according to inverter
Output electric current is calculated；
S4, double-closed-loop control device are calculated according to the voltage and current signals that the reference-input signal, grid side inverter export
Output voltage signal is obtained, and using the voltage signal as the reference voltage signal of space voltage vector modulation device；
S5, the space voltage vector modulation device obtain inversion according to the reference voltage signal of the space voltage vector modulation device
Device modulated signal, and output it to grid side inverter；
S6, using presynchronization control algolithm, the output voltage of LCL filter circuit and the waveform of network voltage are adjusted when not grid-connected
It is overlapped；
S7, the switching signal that grid side breaker is issued using quasi-synchronization paralleling control algolithm, it is grid-connected to carry out.
3. it is based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method as claimed in claim 2, it is special
Sign is, controls stator double winding induction machine using the current hysteresis-band control algorithm of outer voltage, specifically includes:
Motor side controller is according to the fiducial value of the voltage of control winding side and the voltage given value of control side, power winding side
D, q axis is calculated to constant current in the fiducial value of voltage and the voltage given value of power winding side, is obtained by direct field orientation
Orientation angle, generates the PWM switching drive signal of control side inverter switching tube, and the control side inverter is opened according to the PWM
It closes driving signal and controls stator double winding induction machine.
4. it is based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method as claimed in claim 2, it is special
Sign is that virtual impedance module described in the S3 is specially based on depression of order resonator and three rank Generalized Integrators are cascade virtual
Impedance module.
5. it is based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method as claimed in claim 2, it is special
Sign is that double-closed-loop control implement body described in the S4 is the two close cycles based on quasi- ratio resonance of outer voltage current inner loop
Controller.
6. it is based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method as claimed in claim 2, it is special
Sign is, presynchronization control algolithm described in the S6 by two integrals in VSG control algolithm active sagging coefficient and
Idle sagging coefficient constitutes two pi regulators, adjusts the output of LCL filter circuit by two P I regulators when not grid-connected
Voltage is overlapped with the waveform of network voltage.
7. it is based on dual stator-winding induction Wind turbines virtual synchronous grid-connected control method as claimed in claim 2, it is special
Sign is that quasi-synchronization paralleling control algolithm described in the S7 detects inverter output voltage and electricity by two phaselocked loops respectively
Amplitude, angular frequency and the phase of voltage on line side, and the difference for judging inverter output voltage and grid side voltage magnitude with
And the difference of angular frequency is less than respective allowable error, and when inverter output voltage phase is consistent with grid side voltage-phase,
Issue the switching signal of grid side breaker.
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| CN107478896A (en) * | 2017-07-14 | 2017-12-15 | 广西大学 | A kind of frequency adaptive harmonic current detection method based on cascade Generalized Integrator |
| CN107887928B (en) * | 2017-11-27 | 2021-03-26 | 广州智光电气股份有限公司 | Control method and device of energy storage system |
| CN108390414A (en) * | 2018-03-08 | 2018-08-10 | 国网浙江省电力公司绍兴供电公司 | A kind of virtual synchronous generator connecting in parallel with system control method based on anticipatory control presynchronization |
| CN108988578B (en) * | 2018-07-14 | 2019-10-15 | 许昌学院 | A kind of virtual synchronous power generation board |
| CN108933502B (en) * | 2018-09-11 | 2020-04-10 | 许昌学院 | Virtual synchronous power generation system |
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| WO2020135904A1 (en) * | 2018-12-28 | 2020-07-02 | Vestas Wind Systems A/S | Virtual synchronous generator with active damping |
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| CN112736965A (en) * | 2020-12-21 | 2021-04-30 | 哈尔滨理工大学 | 10kW three-level three-phase grid-connected inverter based on virtual synchronous generator |
| CN113098070B (en) * | 2021-04-02 | 2022-05-17 | 中国华能集团清洁能源技术研究院有限公司 | Virtual synchronous machine control method and system for double-wind-wheel wind turbine generator set |
| CN113110109B (en) * | 2021-04-30 | 2023-03-07 | 中车株洲电力机车研究所有限公司 | High-speed maglev train motor simulation test device and system |
| CN113507245A (en) * | 2021-07-07 | 2021-10-15 | 北京机械设备研究所 | Driving power take-off power generation device based on stator double-winding generator and control method |
| CN114006402B (en) * | 2021-10-28 | 2024-05-31 | 同济大学 | Micro power supply control method and device based on dynamic virtual impedance |
| CN115549140B (en) * | 2022-10-18 | 2024-04-02 | 国网湖北省电力有限公司电力科学研究院 | Supporting capacity detection device of net-structured energy storage system and operation method thereof |
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