CN105262389B - A kind of positive-negative sequence separation method of double-fed fan motor unit DC bias adaptive equalization - Google Patents
A kind of positive-negative sequence separation method of double-fed fan motor unit DC bias adaptive equalization Download PDFInfo
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Abstract
The present invention provides a kind of positive-negative sequence separation method of double-fed fan motor unit DC bias adaptive equalization, includes the following steps：Stator three-phase voltage, stator three-phase current and rotor three-phase electric current are acquired, and carries out 3S/2S transformation；Stator voltage deviation signal, stator current deviation signal and rotor current deviation signal are determined by integrating closed-loop control；Synchronous stator voltage, synchronous stator current and synchronous rotor electric current are obtained, and 2S/3S transformation is carried out to it.The positive-negative sequence separation method of double-fed fan motor unit DC bias adaptive equalization provided by the invention, to low frequency signal have stronger rejection ability, eliminate DC bias presence can deteriorate frequency locking ring stablize and locking phase accurately influence.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a positive-negative sequence separation method for self-adaptive compensation of direct current offset of a double-fed wind turbine generator.
Background
In the fields of distributed power generation, flexible alternating current transmission, active filters, high-voltage direct current transmission and the like, accurate real-time estimation of the amplitude, the frequency and the phase angle of a power grid voltage signal is a crucial technical means. In a double-fed wind power generation system, the power grid synchronization technology realizes independent control of active power and reactive power. On a wind power plant, the power grid frequently has non-ideal phenomena such as imbalance, phase jump, drop, swell, frequency change, harmonic distortion and the like, and the phenomena put forward higher performance requirements on the alternating current signal positive and negative sequence separation method. Therefore, the method for separating the positive sequence from the negative sequence of the alternating current signal is crucial to the excellence and the inferiority, and is the core and the life pulse of the distributed power generation system.
For the positive-negative sequence separation method provided in document 1, to lock the phase of the positive sequence voltage component, the positive sequence component must be separated. However, the DSP can only sample voltage signals of 0V to 3V, and in order to sample ac sinusoidal signals without distortion, a pull-up voltage of 3V is superimposed on the output terminal of the voltage follower of the sampling channel. To restore the original signal, the sampled value of the pull-up voltage is subtracted in the ADC block. However, it is difficult to eliminate the pull-up voltage samples completely accurately in experiments. The presence of the dc offset deteriorates the stability of the frequency locked loop and the accuracy of the phase lock.
Document 1: dingjie, study of LCL-VSR control strategy under grid imbalance conditions, [ D ]. master academic thesis of combined fertilizer industry university, 2011.4.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a positive-negative sequence separation method for self-adaptive compensation of the direct current offset of the double-fed wind turbine generator, which has stronger inhibition capability on low-frequency signals and eliminates the influence that the existence of the direct current offset deteriorates the stability of a frequency locking loop and the accuracy of phase locking.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a positive and negative sequence separation method for self-adaptive compensation of direct current offset of a double-fed wind turbine generator, which comprises the following steps of:
step 1: collecting stator three-phase voltage, stator three-phase current and rotor three-phase current, and performing 3S/2S conversion;
step 2: determining a stator voltage deviation signal, a stator current deviation signal and a rotor current deviation signal through integral closed-loop control;
and step 3: and acquiring synchronous stator voltage, synchronous stator current and synchronous rotor current, and performing 2S/3S conversion on the synchronous stator voltage, the synchronous stator current and the synchronous rotor current.
The step 1 specifically comprises the following steps:
step 1-1: when the doubly-fed wind turbine generator works normally, the stator three-phase voltage, the stator three-phase current and the rotor three-phase current are respectively acquired through a stator voltage sensor, a stator current sensor and a rotor current sensor;
1-2, performing 3S/2S conversion on the stator three-phase voltage, the stator three-phase current and the rotor three-phase current to obtain stator voltage, stator current and rotor current under a two-phase static coordinate system, wherein the stator voltage comprises α -phase stator voltage vsαand a stator voltage v of beta phasesβthe stator current comprises α phase stator current isαand β phase stator current isβthe rotor current comprises α phase rotor current irαand β phase rotor current irβRespectively expressed as:
wherein v issa、vsb、vscRepresenting stator three-phase voltage, isa、isb、iscRepresenting stator three-phase currents, ira、irb、ircRepresenting the rotor three-phase current.
The step 2 comprises the following steps:
step 2-1: determining a stator voltage initial deviation signal, a stator current initial deviation signal and a rotor current initial deviation signal, comprising:
wherein,represents the alpha phase stator voltage initial deviation signal,represents the beta-phase stator voltage initial deviation signal,represents the alpha phase stator current initial offset signal,represents the beta-phase stator current initial offset signal,represents the α phase rotor current initial offset signal,representing the initial deviation signal of the rotor current in beta phase vsα' denotes an alpha-phase synchronous stator voltage, vsβ' denotes a beta-phase synchronous stator voltage, isα' denotes an alpha-phase synchronous stator current, isβ' denotes a beta-phase synchronous stator current irα' denotes the alpha-phase synchronous rotor current, irβ' denotes a beta-phase synchronous rotor current vsα′、vsβ′、isα′、isβ′、irα′、irβ' the initial values are all 0;
step 2-2:respectively transmitting the direct current offset d to an integral regulator, and estimating a direct current offset d, wherein the integral coefficient of the integral regulator is lambda;
step 2-3:respectively compensating the DC offset d to obtain stator voltage deviation signal, stator current deviation signal and rotor current deviation signal, wherein the stator voltage deviation signal comprises alpha-phase stator voltage deviation signaland β phase stator voltage deviation signalthe stator current deviation signal comprises α -phase stator current deviation signaland β phase stator current deviation signalthe rotor current deviation signal comprises α -phase rotor current deviation signaland β phase rotor current deviation signal
The step 3 specifically comprises the following steps:
step 3-1: calculating vsα′、vsβ′、isα′、isβ′、irα′、irβ', there are:
where k denotes a broadband coefficient, ω' denotes a resonance angular frequency, qvsα' denotes α phase quadrature lagging stator voltage of alpha phase, qvsβ' denotes β -phase quadrature lagging stator voltage, qisα' denotes α -phase quadrature-lag stator current, qisβ' means a.beta.phase quadrature lagging stator current, qirα' denotes the alpha-phase quadrature lag rotor current, qirβ' represents β quadrature-phase quadrature lag rotor current;
step 3-2: calculating synchronous stator voltage, synchronous stator current and synchronous rotor current, synchronous stator voltage includes synchronous positive sequence stator voltage and synchronous negative sequence stator voltage, synchronous stator current includes synchronous positive sequence stator current and synchronous negative sequence stator current, synchronous rotor current includes synchronous positive sequence rotor current and synchronous negative sequence rotor current, has:
wherein,representing the alpha phase synchronous positive sequence stator voltage,representing the beta phase synchronous positive sequence stator voltage,representing the α phase synchronous negative sequence stator voltage,representing the β phase synchronous negative sequence stator voltage,representing the alpha phase synchronous positive sequence stator current,representing the beta phase synchronous positive sequence stator current,representing the α phase synchronous negative sequence stator current,representing the β phase synchronous negative sequence stator current,representing the alpha phase synchronous positive sequence rotor current,representing the beta phase synchronous positive sequence rotor current,representing the α phase synchronous negative sequence rotor current,represents a beta-phase synchronous negative-sequence rotor current;
step 3-3: will be provided with2S/3S conversion is carried out to obtain stator three-phase positive sequence voltage And stator three-phase negative sequence voltageWill be provided with2S/3S conversion is carried out to obtain stator three-phase positive sequence currentAnd stator three-phase negative sequence currentWill be provided with 2S/3S conversion is carried out to obtain three-phase positive sequence current of the rotorAnd rotor three-phase negative sequence current The method specifically comprises the following steps:
step 3-4: will be provided with And transmitting the data to the processor module for processing, thereby realizing the control of the double-fed generator set.
Compared with the prior art, the invention has the beneficial effects that:
1) aiming at the influence of the direct current offset on the accuracy of the phase-locked loop of the doubly-fed wind turbine generator, the method similar to a state observer is designed to estimate the direct current offset of the sampling signal, and the direct current offset is eliminated through closed-loop control. The provided direct current offset self-adaptive compensation method greatly improves the stability of the double-fed wind turbine phase-locked loop, and successfully eliminates the influence of the existence of the direct current offset on the stability and the accuracy of the phase-locked loop;
2) compared with the traditional phase locking method, the phase locking method has a faster attenuation effect in a low-frequency band, eliminates the influence of direct current offset on the accuracy and stability of a phase locking loop, simultaneously enhances the stability of a phase locking link on low-frequency interference signals, and improves the stability and accuracy of the phase locking loop of the double-fed wind turbine generator on the whole frequency band.
Drawings
FIG. 1 is a flow chart of a positive-negative sequence separation method for self-adaptive compensation of direct current offset of a doubly-fed wind turbine generator in the embodiment of the invention;
FIG. 2 is a phase diagram of a three-phase stationary frame and a two-phase stationary frame according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the positive and negative sequence separation principle in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a positive and negative sequence separation method for self-adaptive compensation of direct current offset of a double-fed wind turbine generator, as shown in figure 1, the method comprises the following steps:
step 1: collecting stator three-phase voltage, stator three-phase current and rotor three-phase current, and performing 3S/2S conversion;
step 2: determining a stator voltage deviation signal, a stator current deviation signal and a rotor current deviation signal through integral closed-loop control;
and step 3: and acquiring synchronous stator voltage, synchronous stator current and synchronous rotor current, and performing 2S/3S conversion on the synchronous stator voltage, the synchronous stator current and the synchronous rotor current.
The step 1 specifically comprises the following steps:
step 1-1: when the doubly-fed wind turbine generator works normally, the stator three-phase voltage, the stator three-phase current and the rotor three-phase current are respectively acquired through a stator voltage sensor, a stator current sensor and a rotor current sensor;
1-2, performing 3S/2S conversion on the stator three-phase voltage, the stator three-phase current and the rotor three-phase current to obtain stator voltage, stator current and rotor current under a two-phase static coordinate system, wherein the stator voltage comprises α -phase stator voltage vsαand a stator voltage v of beta phasesβthe stator current comprises α phase stator current isαand β phase stator current isβthe rotor current comprises α phase rotor current irαand β phase rotor current irβRespectively watchShown as follows:
wherein v issa、vsb、vscRepresenting stator three-phase voltage, isa、isb、iscRepresenting stator three-phase currents, ira、irb、ircRepresenting the rotor three-phase current.
The step 2 comprises the following steps:
step 2-1: determining a stator voltage initial deviation signal, a stator current initial deviation signal and a rotor current initial deviation signal, comprising:
wherein,represents the alpha phase stator voltage initial deviation signal,represents the beta-phase stator voltage initial deviation signal,represents the alpha phase stator current initial offset signal,represents the beta-phase stator current initial offset signal,represents the α phase rotor current initial offset signal,representing the initial deviation signal of the rotor current in beta phase vsα' denotes an alpha-phase synchronous stator voltage, vsβ' denotes a beta-phase synchronous stator voltage, isα' denotes an alpha-phase synchronous stator current, isβ' denotes a beta-phase synchronous stator current irα' denotes the alpha-phase synchronous rotor current, irβ' denotes a beta-phase synchronous rotor current vsα′、vsβ′、isα′、isβ′、irα′、irβ' the initial values are all 0;
step 2-2:respectively transmitting the direct current offset d to an integral regulator, and estimating a direct current offset d, wherein the integral coefficient of the integral regulator is lambda;
step 2-3:respectively compensating the DC offset d to obtain stator voltage deviation signal, stator current deviation signal and rotor current deviation signal, wherein the stator voltage deviation signal comprises alpha-phase stator voltage deviation signaland β phase stator voltage deviationSignalthe stator current deviation signal comprises α -phase stator current deviation signaland β phase stator current deviation signalthe rotor current deviation signal comprises α -phase rotor current deviation signaland β phase rotor current deviation signal
The step 3 specifically comprises the following steps:
step 3-1: calculating vsα′、vsβ′、isα′、isβ′、irα′、irβ', there are:
where k denotes a broadband coefficient, ω' denotes a resonance angular frequency, qvsα' denotes α phase quadrature lagging stator voltage of alpha phase, qvsβ' denotes β -phase quadrature lagging stator voltage, qisα' denotes α -phase quadrature-lag stator current, qisβ' means a.beta.phase quadrature lagging stator current, qirα' denotes the alpha-phase quadrature lag rotor current, qirβ' represents β quadrature-phase quadrature lag rotor current;
step 3-2: calculating synchronous stator voltage, synchronous stator current and synchronous rotor current, synchronous stator voltage includes synchronous positive sequence stator voltage and synchronous negative sequence stator voltage, synchronous stator current includes synchronous positive sequence stator current and synchronous negative sequence stator current, synchronous rotor current includes synchronous positive sequence rotor current and synchronous negative sequence rotor current, has:
wherein,representing the alpha phase synchronous positive sequence stator voltage,representing the beta phase synchronous positive sequence stator voltage,representing the α phase synchronous negative sequence stator voltage,representing the β phase synchronous negative sequence stator voltage,representing the alpha phase synchronous positive sequence stator current,representing the beta phase synchronous positive sequence stator current,representing the α phase synchronous negative sequence stator current,representing the β phase synchronous negative sequence stator current,representing the alpha phase synchronous positive sequence rotor current,representing the beta phase synchronous positive sequence rotor current,representing the α phase synchronous negative sequence rotor current,represents a beta-phase synchronous negative-sequence rotor current;
step 3-3: will be provided with2S/3S conversion is carried out to obtain stator three-phase positive sequence voltage And stator three-phase negative sequence voltageWill be provided with2S/3S conversion is carried out to obtain stator three-phase positive sequence currentAnd stator three-phase negative sequence currentWill be provided with 2S/3S conversion is carried out to obtain three-phase positive sequence current of the rotorAnd rotor three-phase negative sequence current The method specifically comprises the following steps:
step 3-4: will be provided with And transmitting the data to the processor module for processing, thereby realizing the control of the double-fed generator set.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (1)
1. A positive and negative sequence separation method for self-adaptive compensation of direct current offset of a doubly-fed wind turbine generator is characterized by comprising the following steps: the method comprises the following steps:
step 1: collecting stator three-phase voltage, stator three-phase current and rotor three-phase current, and performing 3S/2S conversion;
step 2: determining a stator voltage deviation signal, a stator current deviation signal and a rotor current deviation signal through integral closed-loop control;
and step 3: acquiring synchronous stator voltage, synchronous stator current and synchronous rotor current, and performing 2S/3S conversion on the synchronous stator voltage, the synchronous stator current and the synchronous rotor current;
the step 1 specifically comprises the following steps:
step 1-1: when the doubly-fed wind turbine generator works normally, the stator three-phase voltage, the stator three-phase current and the rotor three-phase current are respectively acquired through a stator voltage sensor, a stator current sensor and a rotor current sensor;
1-2, performing 3S/2S conversion on the stator three-phase voltage, the stator three-phase current and the rotor three-phase current to obtain stator voltage, stator current and rotor current under a two-phase static coordinate system, wherein the stator voltage comprises α -phase stator voltage vsαand a stator voltage v of beta phasesβthe stator current comprises α phase stator current isαand β phase stator current isβthe rotor current comprises α phase rotor current irαand β phase rotor current irβRespectively expressed as:
wherein v issa、vsb、vscRepresenting stator three-phase voltage, isa、isb、iscRepresenting stator three-phase currents, ira、irb、ircRepresenting three-phase current of the rotor;
the step 2 comprises the following steps:
step 2-1: determining a stator voltage initial deviation signal, a stator current initial deviation signal and a rotor current initial deviation signal, comprising:
wherein,represents the alpha phase stator voltage initial deviation signal,represents the beta-phase stator voltage initial deviation signal,represents the alpha phase stator current initial offset signal,represents the beta-phase stator current initial offset signal,represents the α phase rotor current initial offset signal,representing the initial deviation signal of the rotor current in beta phase vsα' denotes an alpha-phase synchronous stator voltage, vsβ' denotes a beta-phase synchronous stator voltage, isα' denotes an alpha-phase synchronous stator current, isβ' denotes a beta-phase synchronous stator current, irα' denotes the alpha-phase synchronous rotor current, irβ' denotes a beta-phase synchronous rotor current vsα′、vsβ′、isα′、isβ′、irα′、irβ' the initial values are all 0;
step 2-2:respectively transmitting the direct current offset d to an integral regulator, and estimating a direct current offset d, wherein the integral coefficient of the integral regulator is lambda;
step 2-3:respectively compensating the DC offset d to obtain stator voltage deviation signal, stator current deviation signal and rotor current deviation signal, wherein the stator voltage deviation signal comprises alpha-phase stator voltage deviation signaland β phase stator voltage deviation signalthe stator current deviation signal comprises α -phase stator current deviation signaland β phase stator current deviation signalthe rotor current deviation signal comprises α -phase rotor current deviation signaland β phase rotor current deviation signal
The step 3 specifically comprises the following steps:
step 3-1: calculating vsα′、vsβ′、isα′、isβ′、irα′、irβ', there are:
where k denotes a broadband coefficient, ω' denotes a resonance angular frequency, qvsα' denotes α phase quadrature lagging stator voltage of alpha phase, qvsβ' denotes β -phase quadrature lagging stator voltage, qisα' denotes α -phase quadrature-lag stator current, qisβ' means a.beta.phase quadrature lagging stator current, qirα' denotes the alpha-phase quadrature lag rotor current, qirβ' represents β quadrature-phase quadrature lag rotor current;
step 3-2: calculating synchronous stator voltage, synchronous stator current and synchronous rotor current, synchronous stator voltage includes synchronous positive sequence stator voltage and synchronous negative sequence stator voltage, synchronous stator current includes synchronous positive sequence stator current and synchronous negative sequence stator current, synchronous rotor current includes synchronous positive sequence rotor current and synchronous negative sequence rotor current, has:
wherein,representing the alpha phase synchronous positive sequence stator voltage,representing the beta phase synchronous positive sequence stator voltage,representing the α phase synchronous negative sequence stator voltage,indicating β phase synchronizationThe negative-sequence stator voltage is set to be negative,representing the alpha phase synchronous positive sequence stator current,representing the beta phase synchronous positive sequence stator current,representing the α phase synchronous negative sequence stator current,representing the β phase synchronous negative sequence stator current,representing the alpha phase synchronous positive sequence rotor current,representing the beta phase synchronous positive sequence rotor current,representing the α phase synchronous negative sequence rotor current,represents a beta-phase synchronous negative-sequence rotor current;
step 3-3: will be provided with2S/3S conversion is carried out to obtain stator three-phase positive sequence voltage And stator three-phase negative sequence voltageWill be provided with2S/3S conversion is carried out to obtain stator three-phase positive sequence currentAnd stator three-phase negative sequence currentWill be provided with2S/3S conversion is carried out to obtain three-phase positive sequence current of the rotorAnd rotor three-phase negative sequence currentThe method specifically comprises the following steps:
step 3-4: will be provided with And transmitting the data to the processor module for processing, thereby realizing the control of the double-fed generator set.
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