CN106452235B  Brushless dualfeed motor stand alone generating system excitation control method under asymmetric load  Google Patents
Brushless dualfeed motor stand alone generating system excitation control method under asymmetric load Download PDFInfo
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 CN106452235B CN106452235B CN201611042019.8A CN201611042019A CN106452235B CN 106452235 B CN106452235 B CN 106452235B CN 201611042019 A CN201611042019 A CN 201611042019A CN 106452235 B CN106452235 B CN 106452235B
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Classifications

 H—ELECTRICITY
 H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
 H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMOELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
 H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
 H02P9/007—Control circuits for doubly fed generators

 H—ELECTRICITY
 H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
 H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMOELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
 H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
 H02P9/48—Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle
Abstract
The invention discloses brushless dualfeed motor stand alone generating system excitation control methods under a kind of asymmetric load, this method is based on just, the double dq coordinate systems of negative phasesequence, it is positivesequence component and negative sequence component by the power winding PW voltage decompositions of brushless dualfeed motor, then PW voltage positivesequence component controllers are respectively adopted and negative sequence component controller adjusts the amplitude and frequency of PW voltages positive sequence and negative sequence component, control winding CW voltages positive sequence needed for obtaining and negative sequence component, CW voltages are just, negative sequence component is added up to final CW voltage given values, PWM modulation signal is generated according to the given value, and then inverter is driven to control CW, finally the amplitude of PW voltage positivesequence components and frequency is made to track given value respectively, the amplitude of PW voltage negative sequence components converges to 0.Constant frequency and constant voltage generating function of brushless dualfeed motor stand alone generating system under the conditions of asymmetric load is can be well realized using this method, control method is simple and reliable, strong robustness.
Description
Technical field
The invention belongs to brushless dualfeed motor technical field of power generation control, more particularly, to a kind of asymmetric load item
The excitation control method of brushless dualfeed motor stand alone generating system under part.
Background technology
Brushless dualfeed motor is a kind of novel AC induction motor, this motor by two sets of different numbers of polepairs stator winding
It is constituted with a set of rotor windings.Its basic principle, which is the rotor by special designing, makes two sets of stator winding generate different numbers of polepairs
Rotating excitation field Indirect Interaction, and can interact and be controlled to realize energy transmission to it.Brushless dualfeed motor
Two sets of stator winding are referred to as power winding (power winding, hereinafter referred to as PW) and control winding (control
Winding, hereinafter referred to as CW), which can be used as motor running, can also generator is used as to run, have asynchronous machine concurrently
And the characteristics of synchronous motor.
Asymmetric load can make existing unbalanced threephase currents in the PW of brushless dualfeed motor, and unbalanced threephase currents are in PW
Each phase internal impedance on generate different pressure drops so that the output voltage (i.e. PW voltages) of electricity generation system occur it is asymmetric,
This makes under conventional control method, the output voltage amplitude and frequency constant of brushless dualfeed motor stand alone generating system
Control targe be difficult to realize.
Both included positivesequence component according to Instantaneous Symmetrical Components theory, in asymmetric voltage or includes negative sequence component.It is sending out
A kind of bright excitation controlling device (application number of brushless dualfeed motor stand alone generating system of patent：201510391869.8) provided
Control method in, the control to CW electric currents is based on single rotating coordinate system, and this method can not be to PW voltages intrinsically
In positivesequence component and negative sequence component be carried out at the same time control.In order to make brushless dualfeed motor stand alone generating system in asymmetric load
Under the conditions of also can stable operation, need to build new control method.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide brushless doublefed under the conditions of a kind of asymmetric load
Machine stand alone generating system excitation control method realizes that brushless dualfeed motor stand alone generating system also can under the conditions of asymmetric load
Realize the constant frequency and constant voltage generating function under speed change varying duty operating mode.The method is suitable for the independent ship based on brushless dualfeed motor
Oceangoing ship ShaftGenerator, independent hydroelectric power system and independent wind generator system etc..
In order to realize the technical purpose of the present invention, present invention employs following technical solutions：
Brushless dualfeed motor stand alone generating system excitation control method, includes the following steps under asymmetric load：
(1) sampling PW threephase voltage instantaneous values u_{1a}、u_{1b}And u_{1c}, PW electricity is calculated using double Second Order Generalized Integrator phaselocked loops
The amplitude of positive pressure order componentsAnd the amplitude of negative sequence component
(2) sampling CW threephase current instantaneous values i_{2a}、i_{2b}And i_{2c}, calculate positive sequence d, q of the CW electric currents in positive synchronous rotating frame
ComponentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
(3) sampling PW threephase current instantaneous values i_{1a}、i_{1b}And i_{1c}, calculate positive sequence d, q of the PW electric currents in positive synchronous rotating frame
ComponentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
(4) according to the amplitude of PW voltage positivesequence componentsPositive sequence d, q component of the CW electric currents in positive synchronous rotating frameCW threephase voltage positivesequence component given values are calculated using PW voltage positivesequence component controllers
With
(5) according to the amplitude of PW voltage negative sequence componentsNegative phasesequence d, q component of the CW electric currents in negative synchronous rotating frame
WithCW threephase voltage negative sequence component given values are calculated using PW voltage negative sequence component controllersWith
(6) positive sequence of CW voltages is added to obtain CW voltage given values with negative sequence component given valueWith
Modulated signal is generated using SVPWM algorithms, and then inverter is made to export corresponding voltage to CW；
(7) repeat the above steps (1)~(6), and the amplitude of PW voltage positivesequence components and frequency is made to track given value respectively, bears
The amplitude of order components converges to 0.
Further, the specific implementation of the step (2) is：
The phase of CW negativesequence currents is calculated first
Wherein, θ_{1}For PW voltage positivesequence component phases,For the phase of CW forwardorder currents
Then the phase of CW forwardorder currents is usedBy CW threephase current instantaneous values i_{2a}、i_{2b}And i_{2c}Become from abc coordinate systems
Transformation changes to positive synchronous rotating frame, obtains d, q component of the CW electric currents in positive synchronous rotating frameWithUsing CW negative phasesequence electricity
The phase of streamBy CW threephase current instantaneous values i_{2a}、i_{2b}And i_{2c}From abc coordinate system transformation to negative synchronous rotating frame, CW electricity is obtained
Flow d, q component in negative synchronous rotating frameWithIt is as follows to convert expression formula：
It is right respectively using notch filterWithIt is filtered, obtains CW electric currents in positive synchronous rotating frame
In positive sequence d, q componentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
Further, the concrete methods of realizing of the step (3) is：
The phase of PW forwardorder currents is calculated firstWith the phase of PW negativesequence currents
Wherein p_{1}For the number of polepairs of power winding PW, p_{2}The number of polepairs of winding CW in order to control, machineries of the η between PW and CW
Angular deviation；
Then the phase of PW forwardorder currents is usedBy PW threephase current instantaneous values i_{1a}、i_{1b}And i_{1c}From abc coordinate system transformations
Positive synchronous rotating frame is transformed to obtainWithUsing the phase of PW negativesequence currentsBy PW threephase current instantaneous values i_{1a}、i_{1b}With
i_{1c}Negative synchronous rotating frame is transformed to from abc coordinate system transformations to obtainWithIt is as follows to convert expression formula：
It is right respectively using notch filterWithIt is filtered, obtains PW electric currents in positive synchronous rotating frame
In positive sequence d, q componentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
Further, the concrete methods of realizing of the step (4) is：
Calculate the amplitude of PW voltage positivesequence componentsWith given amplitudeDifference, adjusted the difference as the first PI
The output of the input of device, the first pi regulator is CW electric current positive sequence amplitude regulated quantitys Before CW electric current positive sequence amplitudes
Feedback amountAddition obtains the given value of CW electric current positive sequence amplitudes
Calculate PW electric voltage frequencies ω_{1}With given frequencyDifference, using the difference as the input of the second pi regulator,
The output of two pi regulators is CW power frequency regulated quantitys With CW power frequency feedforward amountsAddition is obtaining CW just
The frequency of sequence electric currentIt is rightIntegral obtains the phase of CW forwardorder currents
Enable positive sequence d axis component given value of the CW electric currents in positive synchronous rotating frameIt is equal toIt calculatesWith's
Difference, using the difference as the input of third pi regulator, the output of third pi regulator and CW voltages are in positive synchronous rotating frame
In positive sequence d axis feedforward amountsIt is added, obtains positive sequence d axis given value of the CW voltages in positive synchronous rotating frame
Enable positive sequence q axis component given value of the CW electric currents in positive synchronous rotating frameEqual to 0, calculateWithDifference
Value, using the difference as the input of the 4th pi regulator, the output of the 4th pi regulator and CW voltages are in positive synchronous rotating frame
Positive sequence q axis feedforward amountsIt is added, obtains positive sequence q axis given value of the CW voltages in positive synchronous rotating frame
Finally use the phase of CW forwardorder currentsIt willWithAbc coordinate systems are transformed to from positive synchronous rotating frame,
Obtain the CW threephase voltage positivesequence component given values in abc coordinate systemsWith
Further, the CW electric currents positive sequence amplitude feedforward amountCW power frequency feedforward amountsCW voltage positive sequences d
Axis feedforward amountWith CW voltage positive sequence q axis feedforward amountsComputational methods be：
In formula,
In formula,
In formula,
WhereinFor the leakage inductance coefficient of CW, ω_{r}For motor speed, ω_{1}For PW electric voltage frequencies,
For the frequency of CW forwardorder currents, L_{1r}Mutual inductance between PW and rotor, L_{2r}Mutual inductance between CW and rotor, L_{1}For PW from
Sense, L_{2}For the selfinduction of CW, L_{r}For the selfinduction of rotor, R_{1}For the phase resistance of PW, R_{2}For the phase resistance of CW, R_{r}For the phase resistance of rotor；
It willWithThe expression formula that abc coordinate systems are transformed to from positive synchronous rotating frame is：
In the present invention, ω_{r}It can calculate as follows：
(11) sample motor rotorposition signal instantaneous value θ_{r}；
The θ of (12) to adjacent double sampling_{r}Carry out calculus of differences；
(13) is filtered (12) result being calculated using lowpass first order filter, obtains motor speed ω_{r}。
Further, the concrete methods of realizing of the step (5) is as follows：
Calculate the amplitude of PW voltage negative sequence componentsWith given amplitudeDifference, using the difference as the 5th PI tune
The input of device is saved, the output of the 5th pi regulator is CW electric current negative phasesequence amplitude regulated quantitys With CW electric current negative phasesequence amplitudes
Feedforward amountAddition obtains the given value of CW electric current negative phasesequence amplitudes
Enable negative phasesequence d axis component given value of the CW electric currents in negative synchronous rotating frameIt is equal toCW electric currents are calculated negative
Negative phasesequence d components in sequence dq coordinate systemsWithDifference, using the difference as the input of the 6th pi regulator, the 6th PI
Output and negative phasesequence d axis feedforward amount of the CW voltages in negative synchronous rotating frame of adjusterIt is added, obtains CW voltages in negative phasesequence
Negative phasesequence d axis given values in dq coordinate systems
Enable negative phasesequence q axis component given value of the CW electric currents in negative synchronous rotating frameEqual to 0, CW electric currents are calculated in negative phasesequence
Negative phasesequence q components in dq coordinate systemsWithDifference, using the difference as the input of the 7th pi regulator, the 7th PI is adjusted
Output and negative phasesequence q axis feedforward amount of the CW voltages in negative synchronous rotating frame of deviceIt is added, obtains CW voltages and sat in negative phasesequence dq
Negative phasesequence q axis given values in mark system
Finally use the phase of CW negativesequence currentsIt willWithAbc coordinate systems are transformed to from negative synchronous rotating frame,
Obtain the CW threephase voltage negative sequence component given values in abc coordinate systemsWith
Further, the CW electric currents negative phasesequence amplitude feedforward amountNegative phasesequence d axis of the CW voltages in negative synchronous rotating frame
Feedforward amountWith negative phasesequence q component of the CW electric currents in negative synchronous rotating frameComputational methods be：
In formula,
In formula,
In formula,
WhereinFor the leakage inductance coefficient of CW, ω_{r}For motor speed, ω_{1}For PW electric voltage frequencies,For CW negative phasesequences
The frequency of electric current, L_{1r}Mutual inductance between PW and rotor, L_{2r}Mutual inductance between CW and rotor, L_{1}For the selfinduction of PW, L_{2}For CW
Selfinduction, L_{r}For the selfinduction of rotor, R_{1}For the phase resistance of PW, R_{2}For the phase resistance of CW, R_{r}For the phase resistance of rotor.
It willWithThe expression formula that abc coordinate systems are transformed to from negative synchronous rotating frame is：
Further, the CW threephase voltage given values in the step (6)WithIt is to be calculated by step (5)
Obtained CW threephase voltage positivesequence component given values are added with the CW threephase voltage negative sequence component given values that step (6) is calculated
It obtains, expression formula is：
The advantageous effects of the present invention are embodied in：
Brushless dualfeed motor stand alone generating system excitation control method is under the conditions of asymmetric load provided by the present invention
Based on the double dq coordinate systems of positive and negative sequence, PW voltage positivesequence component controllers are according to the positivesequence component amplitude of PW voltages and giving for frequency
Definite value and value of feedback adjust CW voltage positivesequence components, and PW voltage negative sequence component controllers are according to the negative sequence component amplitudes of PW voltages
Given value and value of feedback adjust CW voltage negative sequence components, and PW voltage negatives sequence controller need not be to the frequency of PW voltage negative sequence components
It is controlled, this is because the frequency of positivesequence component and the frequency of negative sequence component are identical, if to the frequency of positivesequence component
Good tracking is realized, then also realizing the tracking to negative sequence component frequency naturally.CW voltage positive and negative sequence components are added
CW voltage given values finally are obtained, PWM modulation signal are generated according to the given value, and then inverter is driven to control CW.
Balanced load is a kind of special circumstances of asymmetric load, and control method provided by the present invention can equally be well applied to balanced load
Under the conditions of brushless dualfeed motor stand alone generating system operation control.
Description of the drawings
Fig. 1 be the embodiment of the present invention asymmetric load under brushless dualfeed motor stand alone generating system excitation control method stream
Cheng Tu；
Fig. 2 is the functional block diagram that the embodiment of the present invention decomposes CW electric currents in positivenegative sequence rotating coordinate system；
Fig. 3 is the functional block diagram that the embodiment of the present invention decomposes PW electric currents in positivenegative sequence rotating coordinate system；
Fig. 4 is the PW voltage positivesequence component controller principle block diagrams of the embodiment of the present invention；
Fig. 5 is the PW voltage negative sequence component controller principle block diagrams of the embodiment of the present invention；
Fig. 6 (a) is to use to control described in a kind of excitation controlling device of brushless dualfeed motor stand alone generating system of patent of invention
PW line voltage waveforms when method processed；
Fig. 6 (b) is to use to control described in a kind of excitation controlling device of brushless dualfeed motor stand alone generating system of patent of invention
CW phase current waveforms when method processed；
Fig. 7 (a) is the PW line voltage waveforms of the embodiment of the present invention；
Fig. 7 (b) is the CW phase current waveforms of the embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In embodiments of the present invention, as shown in Figure 1, including the following steps：
(1) sampling PW threephase voltage instantaneous values u_{1a}、u_{1b}And u_{1c}, PW electricity is calculated using double Second Order Generalized Integrator phaselocked loops
The amplitude of positive pressure order componentsAnd the amplitude of negative sequence component
(2) sampling CW threephase current instantaneous values i_{2a}、i_{2b}And i_{2c}, calculate positive sequence d, q of the CW electric currents in positive synchronous rotating frame
ComponentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
(3) sampling PW threephase current instantaneous values i_{1a}、i_{1b}And i_{1c}, calculate positive sequence d, q of the PW electric currents in positive synchronous rotating frame
ComponentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
(4) CW threephase voltage positivesequence component given values are calculated using PW voltage positivesequence component controllers
With
(5) CW threephase voltage negative sequence component given values are calculated using PW voltage negative sequence component controllers
With
(6) positive sequence of CW threephase voltages is added to obtain CW threephase voltage given values with negative sequence component given valueWithModulated signal is generated using SVPWM algorithms, and then inverter is made to export corresponding voltage to CW；
(7) repeat the above steps (1)~(6), and the amplitude of PW voltage positivesequence components and frequency is made to track given value respectively, bears
The amplitude of order components converges to 0.
In embodiments of the present invention, as shown in Fig. 2, the specific implementation mode of step (2) is：
The phase of CW negativesequence currents is calculated firstThen the phase of CW forwardorder currents is usedIt will as reference angle
i_{2a}、i_{2b}And i_{2c}Positive synchronous rotating frame is transformed to from abc coordinate system transformations, obtains d, q in positive synchronous rotating frame points of CW electric currents
AmountWithUsing the phase of CW negativesequence currentsBy i_{2a}、i_{2b}And i_{2c}From abc coordinate system transformation to negative synchronous rotating frame, obtain
To d, q component of the CW electric currents in negative synchronous rotating frameWithUse damped coefficient forTrap frequency is 2 times of PW electricity
Press the notch filter of rated frequency right respectivelyWithIt is filtered, obtains CW electric currents in positive synchronous rotating frame
In positive sequence d, q componentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
In embodiments of the present invention, as shown in figure 3, the specific implementation mode of step (3) is：
The phase of PW forwardorder currents is calculated firstWith the phase of PW negativesequence currentsThen PW forwardorder currents are used
PhaseBy i_{1a}、i_{1b}And i_{1c}Positive synchronous rotating frame is transformed to from abc coordinate system transformations to obtainWithUsing PW negativesequence currents
PhaseBy i_{1a}、i_{1b}And i_{1c}Negative synchronous rotating frame is transformed to from abc coordinate system transformations to obtainWithUsing damped coefficient
ForTrap frequency is that the notch filter of 2 times of PW voltagerating frequencies is right respectivelyWithIt is filtered,
Obtain positive sequence d, q component of the PW electric currents in positive synchronous rotating frameWithAnd negative phasesequence d, q in negative synchronous rotating frame point
AmountWith
In embodiments of the present invention, as shown in figure 4, the specific implementation mode of step (4) is：
Calculate the amplitude of PW voltage positivesequence componentsWith given amplitudeDifference, using the difference as pi regulator 1
Input, the output of pi regulator 1 is CW electric current positive sequence amplitude regulated quantitys With CW electric current positive sequence amplitude feedforward amountsAddition obtains the given value of CW electric current positive sequence amplitudesCalculate PW electric voltage frequencies ω_{1}With given frequencyDifference, will
The output of input of the difference as pi regulator 2, pi regulator 2 is CW power frequency regulated quantitys With CW electric currents
Frequency feedforward amountAddition obtains the frequency of CW forwardorder currentsIt is rightIntegral obtains the phase of CW forwardorder currentsIt enables
Positive sequence d axis component given value of the CW electric currents in positive synchronous rotating frameIt is equal toIt calculatesWithDifference, by the difference
It is worth the input as pi regulator 3, output and positive sequence d axis feedforward amount of the CW voltages in positive synchronous rotating frame of pi regulator 3It is added, obtains positive sequence d axis given value of the CW voltages in positive synchronous rotating frameEnable CW electric currents in positive synchronous rotating frame
In positive sequence q axis component given valuesEqual to 0, calculateWithDifference, using the difference as the defeated of pi regulator 4
Enter, output and positive sequence q axis feedforward amount of the CW voltages in positive synchronous rotating frame of pi regulator 4It is added, obtains CW voltages
Positive sequence q axis given values in positive synchronous rotating frameFinally use the phase of CW forwardorder currentsIt willWithFrom
Positive synchronous rotating frame transforms to abc coordinate systems, obtains the CW threephase voltage positivesequence component given values in abc coordinate systemsWith
In embodiments of the present invention, as shown in figure 5, the specific implementation mode of step (5) is：
Calculate the amplitude of PW voltage negative sequence componentsWith given amplitudeDifference, using the difference as pi regulator 5
Input, the output of pi regulator 5 is CW electric current negative phasesequence amplitude regulated quantitys With CW electric current negative phasesequence amplitude feedforward amountsAddition obtains the given value of CW electric current negative phasesequence amplitudesEnable negative phasesequence d axis component of the CW electric currents in negative synchronous rotating frame to
Definite valueIt is equal toIt calculatesWithDifference, using the difference as the input of pi regulator 6, pi regulator 6 it is defeated
Go out the negative phasesequence d axis feedforward amounts in negative synchronous rotating frame with CW voltagesIt is added, obtains CW voltages in negative synchronous rotating frame
Negative phasesequence d axis given valuesEnable negative phasesequence q axis component given value of the CW electric currents in negative synchronous rotating frameEqual to 0, calculateWithDifference, using the difference as the input of pi regulator 7, the output of pi regulator 7 is sat with CW voltages in negative phasesequence dq
Negative phasesequence q axis feedforward amounts in mark systemIt is added, obtains negative phasesequence q axis given value of the CW voltages in negative synchronous rotating frame
Finally use the phase of CW negativesequence currentsIt willWithAbc coordinate systems are transformed to from negative synchronous rotating frame, obtain abc seats
CW threephase voltage negative sequence component given values in mark systemWith
In embodiments of the present invention, CW threephase voltage positivesequence component given values step (4) being calculatedThe CW threephase voltage negative sequence component given values being calculated with step (5)
Corresponding be added obtains the CW threephase voltage given values in step (6)With,Then it utilizes SVPWM algorithms to generate to adjust
Signal processed, and then inverter is made to export corresponding voltage to CW.
In the present embodiment, it is respectively 1 and 3, PW that the rated power of brushless dualfeed motor, which is the number of polepairs of 30kw, PW and CW,
Rated voltage with CW is respectively 380V and 320V, and the rated current of PW and CW are respectively 45A and 40A, synchronous rotational speed 750r/
Mutual inductance L between min, PW and rotor_{1r}For 0.1175H, the mutual inductance L between CW and rotor_{2r}For 0.3359H, the selfinduction L of PW_{1}For
The selfinduction L of 0.4519H, CW_{2}For 0.4977H, the selfinduction L of rotor_{r}For 0.0366H, the phase resistance R of PW_{1}For 2.73 Ω, the phase of CW
Resistance R_{2}For 1.16 Ω, the phase resistance R of rotor_{r}For 0.1822 Ω.Used asymmetric load in the present embodiment, A phases are 25
Ω resistive loads, B phases and C phases are 100 Ω resistive loads.Brushless dualfeed motor output line voltage (i.e. PW voltages) virtual value
Given given value with frequency is respectively 380V, 50Hz, and the rotating speed of brushless dualfeed motor is maintained at 930rpm when being tested.
Fig. 6 (a) is to use to control described in a kind of excitation controlling device of brushless dualfeed motor stand alone generating system of patent of invention
PW line voltage waveforms when method processed.The ordinate of Fig. 6 (a) is PW line voltages, unit V；Abscissa is time, unit s.
Fig. 6 (b) is to use to control described in a kind of excitation controlling device of brushless dualfeed motor stand alone generating system of patent of invention
CW phase current waveforms when method processed.The ordinate of Fig. 6 (b) is CW phase currents, unit A；Abscissa is time, unit s.
Fig. 7 (a) is the PW line voltage waveforms of the embodiment of the present invention.The ordinate of Fig. 7 (a) is PW line voltages, unit V；
Abscissa is time, unit s.
Fig. 7 (b) is the CW phase current waveforms of the embodiment of the present invention.The ordinate of Fig. 7 (b) is CW phase currents, unit A；
Abscissa is time, unit s.
As shown in Fig. 6 (a), in brushless dualfeed motor stand alone generating system band asymmetric load, according to patent of invention
Control method described in a kind of excitation controlling device of brushless dualfeed motor stand alone generating system, PW line voltage waveforms occur it is serious not
Symmetrically.The asymmetry of PW voltages makes CW phase currents also produce distortion, such as Fig. 6 by the coupling of brushless doublefed machine rotor
(b) shown in.
As shown in Fig. 7 (a), in brushless dualfeed motor stand alone generating system band asymmetric load, according to institute of the present invention
Control method is stated, PW line voltage waveforms significantly improve.And CW phase currents show as being superimposed on the basis of fundamental wave centainly
The harmonic wave of amount, as shown in Fig. 7 (b).
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (8)
1. brushless dualfeed motor stand alone generating system excitation control method, feature exist under asymmetric load, include the following steps：
(1) sampling PW threephase voltage instantaneous values u_{1a}、u_{1b}And u_{1c}, PW voltages are being calculated just using double Second Order Generalized Integrator phaselocked loops
The amplitude of order componentsAnd the amplitude of negative sequence componentPW is power winding；
(2) sampling CW threephase current instantaneous values i_{2a}、i_{2b}And i_{2c}, calculate positive sequence d, q component of the CW electric currents in positive synchronous rotating frameWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWithCW windings in order to control；
(3) sampling PW threephase current instantaneous values i_{1a}、i_{1b}And i_{1c}, calculate positive sequence d, q component of the PW electric currents in positive synchronous rotating frameWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
(4) according to the amplitude of PW voltage positivesequence componentsPositive sequence d, q component of the CW electric currents in positive synchronous rotating frameCW threephase voltage positivesequence component given values are calculated using PW voltage positivesequence component controllers
With
(5) according to the amplitude of PW voltage negative sequence componentsNegative phasesequence d, q component of the CW electric currents in negative synchronous rotating frameWithCW threephase voltage negative sequence component given values are calculated using PW voltage negative sequence component controllersWith
(6) positive sequence of CW threephase voltages is added to obtain CW threephase voltage given values with negative sequence component given valueWithModulated signal is generated using SVPWM algorithms, and then inverter is made to export corresponding voltage to CW；
(7) repeat the above steps (1)~(6), and the amplitude of PW voltage positivesequence components and frequency is made to track given value, negative phasesequence point respectively
The amplitude of amount converges to 0.
2. brushless dualfeed motor stand alone generating system excitation control method under asymmetric load according to claim 1,
It is characterized in that, the specific implementation of the step (2) is：
The phase of CW negativesequence currents is calculated first
Wherein, θ_{1}For PW voltage positivesequence component phases,For the phase of CW forwardorder currents
Then the phase of CW forwardorder currents is usedBy CW threephase current instantaneous values i_{2a}、i_{2b}And i_{2c}It is converted from abc coordinate system transformations
To positive synchronous rotating frame, d, q component of the CW electric currents in positive synchronous rotating frame is obtainedWithUsing the phase of CW negativesequence currents
PositionBy CW threephase current instantaneous values i_{2a}、i_{2b}And i_{2c}From abc coordinate system transformation to negative synchronous rotating frame, CW electric currents are obtained negative
D, q component in sequence dq coordinate systemsWithIt is as follows to convert expression formula：
It is right respectively using notch filterWithIt is filtered, obtains CW electric currents in positive synchronous rotating frame
Positive sequence d, q componentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
3. brushless dualfeed motor stand alone generating system excitation control method under asymmetric load according to claim 2,
It is characterized in that, the concrete methods of realizing of the step (3) is：
The phase of PW forwardorder currents is calculated firstWith the phase of PW negativesequence currents
Wherein p_{1}For the number of polepairs of power winding PW, p_{2}The number of polepairs of winding CW in order to control, mechanical angles of the η between PW and CW
Deviation；
Then the phase of PW forwardorder currents is usedBy PW threephase current instantaneous values i_{1a}、i_{1b}And i_{1c}From abc coordinate system transformations to just
Sequence dq coordinate systems obtainWithUsing the phase of PW negativesequence currentsBy PW threephase current instantaneous values i_{1a}、i_{1b}And i_{1c}From abc
Coordinate system transformation transforms to negative synchronous rotating frame and obtainsWithIt is as follows to convert expression formula：
It is right respectively using notch filterWithIt is filtered, obtains PW electric currents in positive synchronous rotating frame
Positive sequence d, q componentWithAnd negative phasesequence d, the q component in negative synchronous rotating frameWith
4. brushless dualfeed motor stand alone generating system excitation control method under asymmetric load according to claim 1,
It is characterized in that, the concrete methods of realizing of the step (4) is：
Calculate the amplitude of PW voltage positivesequence componentsWith given amplitudeDifference, using the difference as the first pi regulator
The output of input, the first pi regulator is CW electric current positive sequence amplitude regulated quantitysWith CW electric current positive sequence amplitude feedforward amountsAddition obtains the given value of CW electric current positive sequence amplitudes
Calculate PW electric voltage frequencies ω_{1}With given frequencyDifference, using the difference as the input of the second pi regulator, the 2nd PI
The output of adjuster is CW power frequency regulated quantitysWith CW power frequency feedforward amountsAddition obtains CW positive sequences
The frequency of electric currentIt is rightIntegral obtains the phase of CW forwardorder currents
Enable positive sequence d axis component given value of the CW electric currents in positive synchronous rotating frameIt is equal toIt calculatesWithDifference
Value, using the difference as the input of third pi regulator, the output of third pi regulator and CW voltages are in positive synchronous rotating frame
Positive sequence d axis feedforward amountsIt is added, obtains positive sequence d axis given value of the CW voltages in positive synchronous rotating frame
Enable positive sequence q axis component given value of the CW electric currents in positive synchronous rotating frameEqual to 0, calculateWithDifference, will
Input of the difference as the 4th pi regulator, output and positive sequence of the CW voltages in positive synchronous rotating frame of the 4th pi regulator
Q axis feedforward amountsIt is added, obtains positive sequence q axis given value of the CW voltages in positive synchronous rotating frame
Finally use the phase of CW forwardorder currentsIt willWithAbc coordinate systems are transformed to from positive synchronous rotating frame, are obtained
CW threephase voltage positivesequence component given values in abc coordinate systemsWith
5. brushless dualfeed motor stand alone generating system excitation control method under asymmetric load according to claim 4,
It is characterized in that, the CW electric currents positive sequence amplitude feedforward amountCW power frequency feedforward amountsCW voltage positive sequence d axis feedforward amountsWith CW voltage positive sequence q axis feedforward amountsComputational methods be：
In formula,
In formula,
In formula,
WhereinFor the leakage inductance coefficient of CW, ω_{r}For motor speed, ω_{1}For PW electric voltage frequencies,For CW positive sequences
The frequency of electric current, L_{1r}Mutual inductance between PW and rotor, L_{2r}Mutual inductance between CW and rotor, L_{1}For the selfinduction of PW, L_{2}For CW
Selfinduction, L_{r}For the selfinduction of rotor, R_{1}For the phase resistance of PW, R_{2}For the phase resistance of CW, R_{r}For the phase resistance of rotor, p_{1}For power around
The number of polepairs of group PW, p_{2}The number of polepairs of winding CW in order to control；
It willWithThe expression formula that abc coordinate systems are transformed to from positive synchronous rotating frame is：
6. brushless dualfeed motor stand alone generating system excitation control method under asymmetric load according to claim 1,
It is characterized in that, the concrete methods of realizing of the step (5) is as follows：
Calculate the amplitude of PW voltage negative sequence componentsWith given amplitudeDifference, using the difference as the 5th pi regulator
The output of input, the 5th pi regulator is CW electric current negative phasesequence amplitude regulated quantitysWith CW electric current negative phasesequence amplitude feedforward amountsAddition obtains the given value of CW electric current negative phasesequence amplitudes
Enable negative phasesequence d axis component given value of the CW electric currents in negative synchronous rotating frameIt is equal toCW electric currents are calculated in negative phasesequence dq
Negative phasesequence d components in coordinate systemWithDifference, using the difference as the input of the 6th pi regulator, the 6th PI is adjusted
Output and negative phasesequence d axis feedforward amount of the CW voltages in negative synchronous rotating frame of deviceIt is added, obtains CW voltages and sat in negative phasesequence dq
Negative phasesequence d axis given values in mark system
Enable negative phasesequence q axis component given value of the CW electric currents in negative synchronous rotating frameEqual to 0, calculates CW electric currents and sat in negative phasesequence dq
Negative phasesequence q components in mark systemWithDifference, using the difference as the input of the 7th pi regulator, the 7th pi regulator
Output with negative phasesequence q axis feedforward amount of the CW voltages in negative synchronous rotating frameIt is added, obtains CW voltages in negative phasesequence dq coordinates
Negative phasesequence q axis given values in system
Finally use the phase of CW negativesequence currentsIt willWithAbc coordinate systems are transformed to from negative synchronous rotating frame, are obtained
CW threephase voltage negative sequence component given values in abc coordinate systemsWith
7. brushless dualfeed motor stand alone generating system excitation control method under asymmetric load according to claim 6,
It is characterized in that, the CW electric currents negative phasesequence amplitude feedforward amountNegative phasesequence d axis feedforward amount of the CW voltages in negative synchronous rotating frameWith negative phasesequence q component of the CW electric currents in negative synchronous rotating frameComputational methods be：
In formula,
In formula,
In formula,
WhereinFor the leakage inductance coefficient of CW, ω_{r}For motor speed, ω_{1}For PW electric voltage frequencies,For CW negative phasesequences
The frequency of electric current, L_{1r}Mutual inductance between PW and rotor, L_{2r}Mutual inductance between CW and rotor, L_{1}For the selfinduction of PW, L_{2}For CW
Selfinduction, L_{r}For the selfinduction of rotor, R_{1}For the phase resistance of PW, R_{2}For the phase resistance of CW, R_{r}For the phase resistance of rotor, p_{2}In order to control around
The number of polepairs of group CW；
It willWithThe expression formula that abc coordinate systems are transformed to from negative synchronous rotating frame is：
8. brushless dualfeed motor stand alone generating system excitation control method under asymmetric load according to claim 1,
It is characterized in that, the CW threephase voltage given values in the step (6)WithIt is the CW being calculated by step (4)
Threephase voltage positivesequence component given value is added to obtain with the CW threephase voltage negative sequence component given values that step (5) is calculated,
Expression formula is：
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