CN102638058B - Grid-connected control system and method for variable-speed constant-frequency (VSCF) double-rotor permanent magnet wind generator - Google Patents

Grid-connected control system and method for variable-speed constant-frequency (VSCF) double-rotor permanent magnet wind generator Download PDF

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CN102638058B
CN102638058B CN201210129710.5A CN201210129710A CN102638058B CN 102638058 B CN102638058 B CN 102638058B CN 201210129710 A CN201210129710 A CN 201210129710A CN 102638058 B CN102638058 B CN 102638058B
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grid
generator
rotor
stator
voltage
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CN102638058A (en
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张建忠
王元元
程明
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东南大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/60Planning or developing urban green infrastructure
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The invention discloses a grid-connected control system and method for a variable-speed constant-frequency (VSCF) double-rotor permanent magnet wind generator and belongs to the technical field of new-energy power generation. The grid-connected control system comprises a wind turbine, a double-rotor permanent magnet wind generator, a generator-side power converter, a grid-side power converter and a grid-connected control system, wherein the grid-connected control system consists of a grid-connected control signal generation device, signal execution switches, fuses and a filter. According to the grid-connected control system and the method for the VSCF double-rotor permanent magnet wind generator, the regulation of the output voltage of a stator terminal of the VSCF double-rotor permanent magnet wind generator is realized through measuring and simulating the rotating speed of a prime mover of the wind turbine and controlling the current of an inner rotor of the VSCF double-rotor permanent magnet wind generator, and then the flexible connection between the VSCF double-rotor permanent magnet wind generator and the grid is realized. The grid-connected control system for the VSCF double-rotor permanent magnet wind generator has the advantages of simple circuit structure, flexibility in control and higher safety and reliability, and the method, with simplicity and effectiveness, for the grid connection of the double-rotor permanent magnet wind generator is provided.

Description

Variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system and method
technical field
The present invention relates to a kind of variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system and method, belong to generation of electricity by new energy technical field.
background technology
Variable speed constant frequency generator is a kind of new high efficiency generation mode growing up for 20 end of the centurys, being applicable to the regenerative resources such as wind-force, water power develops, in addition, because variable speed constant frequency technology can realize good flexibly connecting between generating set and network system, so be used widely in wind power generation field.Use in the world at present more variable-speed constant-frequency wind power generation system to have and adopt the dual feedback wind power generation system of double fed induction generators and the permanent magnet direct-drive electricity generation system that adopts low-speed direct driving type permagnetic synchronous motor, realizing in grid-connected problem, consider that being connected between synchronous machine and electric power system is rigidly connected, grid-connected condition is harsher, the frequency of generator output depends on the speed of prime mover completely, irrelevant with its excitation, the voltage of grid-connected front generator need to strictly be synchronizeed with electrical network, also must keep invariablenes turning speed after grid-connected; Double fed asynchronous machine is grid-connected to be reduced for the required precision of unit, after grid-connected, can not shake step-out, and net mode is also more, require rotating speed to approach synchronous speed grid-connected, can regulate exciting current according to line voltage and generator speed, and then regulator generator output voltage meets grid-connected condition, can realize under Variable Velocity Condition grid-connected, flexibly connecting between realization and electric power system, both compare, the grid-connected advantage that has more of doubly-fed generation system.
Simultaneously grid-connected than three lamp methods of current comparative maturity, between generator and electrical network, access synchro indicator, according to the situation of change of synchro indicator, judge whether to meet grid-connected condition, its advantage is directly to find out the height situation of generator and mains frequency, dropping into electrical network moment electrical network and motor does not impact, so use morely, shortcoming is the process more complicated of synchronizing, is difficult to operation.
summary of the invention
The invention provides a kind of variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system and method, make it grid-connected more safe and reliable.
The present invention adopts following technical scheme for solving its technical problem:
A kind of variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system, comprise wind energy conversion system, birotor permanent magnetic wind-driven generator, generating pusher side power inverter, net side power inverter and grid-connection control system, wherein, wind energy conversion system is coaxially connected with birotor permanent magnetic wind-driven generator, birotor permanent magnetic wind power generation inboard rotor output and generating pusher side power inverter, DC capacitor link and net side power inverter are linked in sequence, birotor permanent magnetic aerogenerator stator output is connected with grid-connection control system, the grid-connection control system other end is directly connected with electrical network, described grid-connection control system comprises grid-connected control signal generating means, switch, fuse and filter, and switch, fuse and filter are linked in sequence, and grid-connected control signal generating means sends the direct driving switch break-make of control signal.
The control method of described variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system, be birotor permanent magnetic wind-driven generator grid-connected before, do not work with the generating pusher side power inverter that birotor permanent magnetic wind power generation inboard rotor winding is connected, birotor permanent magnetic aerogenerator stator end is unloaded, wind energy conversion system starts and drags birotor permanent magnetic wind power generation inboard rotor rotation under wind drive, under the effect of birotor permanent magnetic wind-driven generator cogging torque, the external rotor of birotor permanent magnetic wind-driven generator can be along with its internal rotor be with a lower speed rotation, in, there is speed discrepancy in outer two rotors, now start the power inverter joining with internal rotor winding, carry out grid-connected control, according to the Mathematical Modeling of birotor permanent magnetic wind-driven generator, while considering that stator terminal is unloaded, ignore stator resistance, adopt when stator magnetic linkage oriented, stator terminal voltage vector hysteresis magnetic linkage 90 degree, and the stator d-axis magnetic linkage of birotor permanent magnetic wind-driven generator and quadrature axis magnetic linkage meet = , =0, direct-axis current and quadrature axis electric current meet i ds = i qs , wherein: with represent respectively generator unit stator d-axis magnetic linkage and quadrature axis magnetic linkage, represent the desirable stator d-axis magnetic linkage in stator magnetic linkage oriented situation, i ds with i qs represent motor stator winding direct-axis current and quadrature axis electric current, while obtaining stator terminal no-load running, the Mathematical Modeling of generator is as follows:
(1)
In formula, with represent respectively birotor permanent magnetic aerogenerator stator direct-axis voltage and quadrature-axis voltage; with represent respectively generator inner rotor direct-axis voltage and quadrature-axis voltage; with represent respectively the permanent magnetism magnetic linkage producing in permanent magnetism magnetic linkage that generator permanent-magnetic outer rotor produces in internal rotor winding and stator winding; with represent respectively generator inner rotor winding direct-axis current and quadrature axis electric current; represent generator inner rotor internal resistance; represent generator external rotor mechanical separator speed; represent generator inner rotor mechanical separator speed; the speed discrepancy that represents generator external rotor and internal rotor; represent mutual inductance between generator unit stator and internal rotor; represent generator inner rotor inductance; , the moment of inertia that represents generator unit stator and internal rotor; represent wind energy conversion system machine torque;
Mathematical Modeling (1) formula when unloaded for this birotor permanent magnetic wind-driven generator is specified grid-connected control method now, needs to meet:
??(2)
In formula, represent generator unit stator d-axis magnetic linkage, represent the desirable stator d-axis magnetic linkage in stator magnetic linkage oriented situation; with represent respectively generator inner rotor d-axis magnetic linkage and quadrature axis magnetic linkage; with represent respectively generator inner rotor winding direct-axis current and quadrature axis electric current; represent generator inner rotor inductance; represent mutual inductance between generator unit stator and internal rotor; represent grid side voltage magnitude; represent differential operator; represent generator external rotor mechanical separator speed; the speed discrepancy that represents generator external rotor and internal rotor;
By prime mover rotating speed and mains frequency foundation (2) formula control generator inner rotor winding direct-axis current of measure analog wind energy conversion system i dr with generator inner rotor winding quadrature axis electric current i qr realize the adjusting for stator terminal voltage frequency, phase place and amplitude, make it meet to send grid-connected signal and then realize flexibility after double-rotor permanent magnet generator and the grid-connected condition of electrical network and be incorporated into the power networks.
The control method of described variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system, be that Vector control technique is applied in grid-connected control, for generating pusher side power inverter, control to regulate variable speed constant frequency birotor permanent magnetic aerogenerator stator end output voltage; Before grid-connected, gather variable speed constant frequency birotor permanent magnetic wind-power electricity generation inboard rotor three-phase current , , As the input signal of vector, the internal rotor winding direct axis current signal under output synchronous rotating frame With quadrature axis current signal ,As input signal, participate in d-axis reference voltage With quadrature axis reference voltage Calculating, by voltage sensor, gather grid side three-phase voltage signal as the input signal of phase-locked loop module simultaneously, output line voltage position signalling , frequency signal , simultaneously by the rotating speed of variable speed constant frequency birotor permanent magnetic wind-power electricity generation inboard rotor speed measuring device collection internal rotor And position signalling ,Grid-connectedly according to electric network voltage phase, calculate stator terminal voltage position signalling afterwards , meet , pass through frequency Obtain rotating speed , pass through voltage magnitude And rotating speed And outer rotor is at the permanent magnetism magnetic linkage of stator winding induction Obtain magnetic linkage , meet , satisfied position when unloaded according to variable speed constant frequency birotor permanent magnetic wind-driven generator And magnetic linkage relation , obtain the reference signal of variable speed constant frequency birotor permanent magnetic wind-power electricity generation inboard rotor electric current , And the position signalling that participates in vector calculating takes from the difference of variable speed constant frequency birotor permanent magnetic wind-driven generator outer rotor and internal rotor position signalling , by the reference current obtaining , With actual direct axis current signal With quadrature axis current signal Compare, via pi regulator, consider current feed-forward decoupling zero component,Obtain the reference voltage signal of d-axis Reference voltage signal with quadrature axis , with the position signalling that participates in vector calculating Send into together vector link, two-phase reference voltage level under the rest frame of output participation space vector of voltage conversion , , with the DC tache voltage value collecting Send into together voltage space vector signal generator link,The space vector modulation signal for drive motors side power inverter after being modulated, is adjusted to stator output end voltage after meeting grid-connected condition and sends grid-connected signal.
Beneficial effect of the present invention is as follows:
Because birotor permanent magnetic wind-driven generator of the present invention can be regarded the double-fed asynchronous induction machine that inside is embedded with p-m rotor as, for Wound-rotor type stator and permanent-magnetic outer rotor, pass through permanent magnet excitation, it is constant that external rotor rotating speed keeps, with respect to stator, with synchronous speed, rotate, make both there is the characteristic of synchronous generator, and for Wound-rotor type internal rotor and permanent-magnetic outer rotor, because external rotor keeps synchronous speed operation, internal rotor changes with wind speed, there is relative speed difference in both, make inner and outer rotors meet the characteristic of asynchronous machine, make this double-rotor machine have the feature of magneto alternator and doubly fed induction generator concurrently simultaneously, its operation characteristic has determined that we can apply to the thought of vector control in the grid-connected control of generator, can realize grid-connected under variable speed constant frequency condition, make that dual rotor permanent magnetic motor is grid-connected has a greater flexibility, implement the more safe and reliable greater flexibility that has.
Therefore the present invention is by measuring prime mover rotating speed and the adjusting for internal rotor electric current according to grid-connected control method, can control motor stator output end voltage makes it to match with line voltage, the flexibility that realizes generator and electrical network is grid-connected, circuit structure is simple, control flexibly, security reliability is higher, for birotor permanent magnetic wind-driven generator grid-connected provides a kind of simple effective method.
accompanying drawing explanation
Fig. 1 is that variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system forms structured flowchart.
Fig. 2 is the grid-connected control principle drawing of variable speed constant frequency birotor permanent magnetic wind-driven generator.
embodiment
Below in conjunction with accompanying drawing, the invention is described in further details.
As seen from Figure 1, variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system, comprise that wind energy conversion system, birotor permanent magnetic wind-driven generator, generating pusher side power inverter, net side power inverter and grid-connection control system form, wherein, grid-connection control system is comprised of switch, fuse and the filter of grid-connected control signal generating means, executive signal, wind energy conversion system directly drives the internal rotor of birotor permanent magnetic wind-driven generator by rotating shaft, internal rotor is connected with generating pusher side power inverter simultaneously, net side power inverter is connected with generating pusher side power inverter by DC link on one side, another side is directly connected with electrical network, grid-connection control system is positioned between birotor permanent magnetic aerogenerator stator end and electrical network, by the control for generating pusher side power inverter, regulate the voltage of birotor permanent magnetic aerogenerator stator output, make it to match with the voltage of grid side, produce grid-connected control signal.
Before birotor permanent magnetic wind-driven generator is grid-connected, do not work with the generating pusher side power inverter that birotor permanent magnetic wind power generation inboard rotor winding is connected, birotor permanent magnetic aerogenerator stator end is unloaded, wind energy conversion system starts and drags birotor permanent magnetic wind power generation inboard rotor rotation under wind drive, under the effect of birotor permanent magnetic wind-driven generator cogging torque, the external rotor of birotor permanent magnetic wind-driven generator can be along with its internal rotor be with a lower speed rotation, in, there is speed discrepancy in outer two rotors, now start the power inverter joining with internal rotor winding, carry out grid-connected control, according to the Mathematical Modeling of birotor permanent magnetic wind-driven generator, while considering that stator terminal is unloaded, ignore stator resistance, adopt when stator magnetic linkage oriented, stator terminal voltage vector hysteresis magnetic linkage 90 degree, and the stator d-axis magnetic linkage of birotor permanent magnetic wind-driven generator and quadrature axis magnetic linkage meet = , =0, direct-axis current and quadrature axis electric current meet i ds = i qs , wherein: with represent respectively generator unit stator d-axis magnetic linkage and quadrature axis magnetic linkage, represent the desirable stator d-axis magnetic linkage in stator magnetic linkage oriented situation, i ds , i qs represent motor stator winding direct-axis current and quadrature axis electric current, during to stator terminal no-load running, the Mathematical Modeling of generator is as follows:
(1)
In formula, , represent birotor permanent magnetic aerogenerator stator direct-axis voltage and quadrature-axis voltage; , represent generator inner rotor direct-axis voltage and quadrature-axis voltage; , represent the permanent magnetism magnetic linkage that generator permanent-magnetic outer rotor produces in internal rotor winding and the permanent magnetism magnetic linkage producing in stator winding; , represent generator inner rotor winding direct-axis current and quadrature axis electric current; represent generator inner rotor internal resistance; represent generator external rotor mechanical separator speed; represent generator inner rotor mechanical separator speed; the speed discrepancy that represents generator external rotor and internal rotor; represent mutual inductance between generator unit stator and internal rotor; represent generator inner rotor inductance; , the moment of inertia that represents generator unit stator and internal rotor; represent wind energy conversion system machine torque.
Mathematical Modeling (1) formula when unloaded for this birotor permanent magnetic wind-driven generator is specified grid-connected control method now, needs to meet:
??(2)
In formula, represent generator unit stator d-axis magnetic linkage, represent the desirable stator d-axis magnetic linkage in stator magnetic linkage oriented situation; with represent respectively generator inner rotor d-axis magnetic linkage and quadrature axis magnetic linkage; with represent respectively generator inner rotor winding direct-axis current and quadrature axis electric current; represent generator inner rotor inductance; represent mutual inductance between generator unit stator and internal rotor; represent grid side voltage magnitude; represent differential operator; represent generator external rotor mechanical separator speed; the speed discrepancy that represents generator external rotor and internal rotor.
By prime mover rotating speed and mains frequency foundation (2) formula control internal rotor winding direct-axis current of measure analog wind energy conversion system i dr with internal rotor winding quadrature axis electric current i qr realize the adjusting for stator terminal voltage frequency, phase place and amplitude, make it meet to send grid-connected signal and then realize flexibility after double-rotor permanent magnet generator and the grid-connected condition of electrical network and be incorporated into the power networks.
As seen from Figure 2, the grid-connected control method of birotor permanent magnetic wind-driven generator is that Vector control technique is applied in grid-connected control, by the regulating and controlling variable speed constant frequency birotor permanent magnetic aerogenerator stator end output voltage for generating pusher side power inverter, be grid-connected front collection birotor permanent magnetic wind power generation inboard rotor electric current and net side three-phase voltage signal, process vector and phase-locked loop module obtain the position signalling of ac-dc axis reference voltage signal and line voltage respectively, frequency signal, according to unloaded Mathematical Modeling (1) formula of birotor permanent magnetic wind-driven generator and grid-connected control method (2) formula, obtain participating in the reference current of calculating and the position signalling of vector, finally by the control for birotor permanent magnetic wind power generation inboard rotor electric current, reach the amplitude for stator output end voltage, frequency and phase place are mated the voltage of electrical network, after Condition Matching, send grid-connected control signal.
The grid-connected condition of birotor permanent magnetic wind-driven generator is that the voltage of birotor permanent magnetic aerogenerator stator end output is identical in amplitude, frequency and phase place with line voltage; Before birotor permanent magnetic wind-force electrical machinery is grid-connected, its stator side is unloaded, and generator no-load running, according to the own characteristic of birotor generator, can be applied to vector control technology in the control of birotor permanent magnetic wind-driven generator.
Before grid-connected, by voltage sensor, gather line voltage as control information, three-phase voltage signal is obtained to voltage phase signal by phaselocked loop And frequency signal , calculate voltage magnitude , in control, adopt the vector controlled of stator voltage flux linkage orientation, during empty load of motor operation, the electric current of stator side dq axle is zero, adopt stator magnetic linkage oriented after, under power frequency condition, ignore known generator unit stator terminal voltage hysteresis stator magnetic linkage after stator resistance , to control target and be and realize grid-connectedly, grid-connected rear line voltage and generator unit stator output voltage match, so calculate stator terminal voltage position signalling according to electric network voltage phase ,Both meet , pass through frequency Obtain rotating speed , pass through voltage magnitude And rotating speed Obtain magnetic linkage ,Meet , Represent the permanent magnetism magnetic linkage that generator outer rotor produces in stator winding, satisfied relational expression during according to generator no-load running, obtains the d-axis reference current of internal rotor , when stator is unloaded, the quadrature axis electric current of internal rotor Be zero; By speed measuring device, record internal rotor tach signal as photoelectric encoder , process integral operation obtains the position signalling of internal rotor ,Obtain participating in the position signalling that vector calculates , , speed discrepancy ; By current sensor, collect the three-phase current of internal rotor and generator side converter , , ,Add position signalling , through abc/dq, conversion obtains internal rotor winding direct-axis current With winding quadrature axis electric current , by itself and reference current component , Through PI proportional controller, compare, consider current feed-forward decoupling zero component, obtain the reference voltage signal of ac-dc axis , , with position signalling Via dq/ Vector obtains participating in voltage under the rest frame of voltage space vector conversion , , with the DC tache voltage value collecting Send into together SVPWM signal generator link, the space vector modulation signal for drive motors side power inverter after can being modulated,Stator output end voltage is adjusted to after meeting grid-connected condition and sends grid-connected signal.

Claims (2)

1. the control method of a variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system, this grid-connection control system comprises wind energy conversion system, birotor permanent magnetic wind-driven generator, generating pusher side power inverter, net side power inverter and grid-connection control system, wherein, wind energy conversion system is coaxially connected with birotor permanent magnetic wind-driven generator, birotor permanent magnetic wind power generation inboard rotor output and generating pusher side power inverter, DC capacitor link and net side power inverter are linked in sequence, birotor permanent magnetic aerogenerator stator output is connected with grid-connection control system, the grid-connection control system other end is directly connected with electrical network, described grid-connection control system comprises grid-connected control signal generating means, switch, fuse and filter, switch, fuse and filter are linked in sequence, grid-connected control signal generating means sends the direct driving switch break-make of control signal, it is characterized in that, the control method of this grid-connection control system, before comprising the steps: that birotor permanent magnetic wind-driven generator is grid-connected, do not work with the generating pusher side power inverter that birotor permanent magnetic wind power generation inboard rotor winding is connected, birotor permanent magnetic aerogenerator stator end is unloaded, wind energy conversion system starts and drags birotor permanent magnetic wind power generation inboard rotor rotation under wind drive, under the effect of birotor permanent magnetic wind-driven generator cogging torque, the external rotor of birotor permanent magnetic wind-driven generator can be along with its internal rotor be with a lower speed rotation, in, there is speed discrepancy in outer two rotors, now start the power inverter joining with internal rotor winding, carry out grid-connected control, according to the Mathematical Modeling of birotor permanent magnetic wind-driven generator, while considering that stator terminal is unloaded, ignore stator resistance, adopt when stator magnetic linkage oriented, stator terminal voltage vector hysteresis magnetic linkage 90 degree, and the stator d-axis magnetic linkage of birotor permanent magnetic wind-driven generator and quadrature axis magnetic linkage meet ψ ds1, ψ qs=0, direct-axis current and quadrature axis electric current meet i ds=i qs, wherein: ψ dsand ψ qsrepresent respectively generator unit stator d-axis magnetic linkage and quadrature axis magnetic linkage, ψ 1represent the desirable stator d-axis magnetic linkage in stator magnetic linkage oriented situation, i dsand i qsrepresent motor stator winding direct-axis current and quadrature axis electric current, while obtaining stator terminal no-load running, the Mathematical Modeling of generator is as follows:
In formula, V dsand V qsrepresent respectively birotor permanent magnetic aerogenerator stator direct-axis voltage and quadrature-axis voltage; V drand V qrrepresent respectively generator inner rotor direct-axis voltage and quadrature-axis voltage; ψ miand ψ morepresent respectively the permanent magnetism magnetic linkage that generator permanent-magnetic outer rotor produces in internal rotor winding and the permanent magnetism magnetic linkage producing in stator winding; i drand i qrrepresent respectively generator inner rotor winding direct-axis current and quadrature axis electric current; r rrepresent generator inner rotor internal resistance; ω orrepresent generator external rotor mechanical separator speed; ω irrepresent generator inner rotor mechanical separator speed; ω orirthe speed discrepancy that represents generator external rotor and internal rotor; L mrepresent mutual inductance between generator unit stator and internal rotor; L rrepresent generator inner rotor inductance; J g, J rthe moment of inertia that represents generator unit stator and internal rotor; T lrepresent wind energy conversion system machine torque;
Mathematical Modeling (1) formula when unloaded for this birotor permanent magnetic wind-driven generator is specified grid-connected control method now, needs to meet:
In formula, ψ dsrepresent generator unit stator d-axis magnetic linkage, ψ 1represent the desirable stator d-axis magnetic linkage in stator magnetic linkage oriented situation; ψ drand ψ qrrepresent respectively generator inner rotor d-axis magnetic linkage and quadrature axis magnetic linkage; i drand i qrrepresent respectively generator inner rotor winding direct-axis current and quadrature axis electric current; L rrepresent generator inner rotor inductance; L mrepresent mutual inductance between generator unit stator and internal rotor; U 1represent grid side voltage magnitude; P represents differential operator; ω orrepresent generator external rotor mechanical separator speed; ω orirthe speed discrepancy that represents generator external rotor and internal rotor;
By prime mover rotating speed and mains frequency foundation (2) formula control generator inner rotor winding direct-axis current i of measure analog wind energy conversion system drwith generator inner rotor winding quadrature axis current i qrrealize the adjusting for stator terminal voltage frequency, phase place and amplitude, make it meet to send grid-connected signal and then realize flexibility after double-rotor permanent magnet generator and the grid-connected condition of electrical network and be incorporated into the power networks.
2. the control method of variable speed constant frequency birotor permanent magnetic wind-driven generator grid-connection control system according to claim 1, it is characterized in that, described grid-connected control method is that Vector control technique is applied in grid-connected control, for generating pusher side power inverter, controls to regulate variable speed constant frequency birotor permanent magnetic aerogenerator stator end output voltage; Before grid-connected, gather variable speed constant frequency birotor permanent magnetic wind power generation inboard rotor three-phase current i a, i b, i cas the input signal of vector, the internal rotor winding direct axis current signal i under output synchronous rotating frame drwith quadrature axis current signal i qr, as input signal, participate in d-axis reference voltage u d *with quadrature axis reference voltage u q *calculating, by voltage sensor, gather grid side three-phase voltage signal as the input signal of phase-locked loop module simultaneously, output line voltage position signalling θ 1, frequency signal f 1, simultaneously by the rotational speed omega of variable speed constant frequency birotor permanent magnetic wind power generation inboard rotor speed measuring device collection internal rotor iwith position signalling θ i, grid-connectedly according to electric network voltage phase, calculate stator terminal voltage position signalling θ afterwards o, meet θ o1+ 90 degree, pass through frequency f 1obtain rotational speed omega 1, by voltage magnitude U 1and rotational speed omega 1and external rotor is at the permanent magnetism magnetic linkage ψ of stator winding induction moobtain magnetic linkage ψ 1, meet ψ 1=U 1/ ω 1mo, satisfied position θ=θ when unloaded according to variable speed constant frequency birotor permanent magnetic wind-driven generator oiand magnetic linkage is related to ψ 1=U 1/ ω 1mo, obtain the reference signal i of variable speed constant frequency birotor permanent magnetic wind power generation inboard rotor electric current d *, i q *and participate in the difference θ that position signalling that vector calculates takes from variable speed constant frequency birotor permanent magnetic wind-driven generator external rotor and internal rotor position signalling, by the reference current i obtaining d *, i q *with actual direct axis current signal i drwith quadrature axis current signal i qrcompare, via pi regulator, consider current feed-forward decoupling zero component, obtain the reference voltage signal u of d-axis d *reference voltage signal u with quadrature axis q *, send into vector link together with participating in position signalling θ that vector calculates, output participates in two-phase reference voltage level u under the rest frame of space vector of voltage conversion α *, u β *, with the DC tache voltage value U collecting dcsend into together voltage space vector signal generator link, the space vector modulation signal for drive motors side power inverter after being modulated, is adjusted to stator output end voltage after meeting grid-connected condition and sends grid-connected signal.
CN201210129710.5A 2012-04-28 2012-04-28 Grid-connected control system and method for variable-speed constant-frequency (VSCF) double-rotor permanent magnet wind generator CN102638058B (en)

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