Background technology
Brushless dual-feed motor is a kind of New-type electric machine received a lot of attention in recent years, and its structure is that have double winding on stator, i.e. power winding and controling winding, respectively by power network and inverter supply;Rotor is using special cage modle either magnetoresistive structures rotor.The motor is particularly suitable for large-scale AC speed regulating energy conserving system and variable-speed constant-frequency wind power generation field, with brushless, required frequency inverter capacity is small, the adjustable advantage of power factor.With the solution of many problems in brushless dual-feed motor structure, in terms of the research emphasis of people has gradually been transferred to control strategy.Asynchronous machine has many successful control methods, such as vector controlled, Direct Torque Control and Indirect UV detection.But it is due to the particularity of brushless dual-feed motor structure, operation principle and Mathematical Modeling, it is impossible to these control methods of direct copying, it is necessary to which the control effect of satisfaction could be obtained by being combined itself and control strategy.Vector controlled, Direct Torque Control have all been applied in brushless dual-feed motor control system in existing literature, and wherein vector controlled needs to carry out rotating coordinate transformation, make system architecture complicated;Direct Torque Control can just realize the direct control of torque under rest frame, it is to avoid rotation transformation, and system architecture is concise.But it is due to that only with a space vector of voltage within a sampling period, torque pulsation is larger when causing low-frequency operation, controling winding current harmonics is also larger.Indirect UV detection is proposed to solve this big problem of direct Torque Control low-frequency torque pulsation, with simple without rotating coordinate transformation, system architecture, the excellent advantage of quiet, dynamic property, the application succeeded in asynchronous machine, but the application in brushless dual-feed motor must solve motor operation principle, Mathematical Modeling with control method be combined and system realize etc. key issue.
The content of the invention
The proposition of problem:Have the shortcomings that controling winding current harmonics is big and torque pulsation is larger during for brushless dual-feed motor direct Torque Control low frequency, propose a kind of method for cage-type rotor brushless dual-feed motor Indirect UV detection.
In order to solve the problem of above-mentioned brushless dual-feed motor direct Torque Control is present, what the present invention took is a kind of based on SVPWM
The Indirect UV detection method of cage-type rotor brushless dual-feed motor under rest frame, realizes that the control method is carried out through the following steps:
(One)Observe controling winding, power winding voltages, the A phases of electric current and B phase components respectively under three-phase static coordinate system
u ac 、
u bc 、
u ap 、
u bp 、i ac 、
i bc 、
i ap 、
i bp , coordinate transform is carried out by 3/2 converter module to above-mentioned physical quantity, controling winding and power winding is obtained each
Voltage and current under rest frame
、
、
、
、
i αc 、i βc 、i αp 、i βp。
(Two)Utilize
、
、
、
、
i αc 、i βc 、i αp 、i βp Controling winding magnetic linkage component is calculated by electromagnetic torque and power winding, controling winding flux linkage calculation module
、
With power winding magnetic linkage component
、
, according to
With
Calculate controling winding magnetic linkage amplitude
。
(Three)Electromagnetic torque is calculated under controling winding and the respective rest frame of power winding by electromagnetic torque and power winding, controling winding flux linkage calculation module respectively, sum of the two is exactly total electromagnetic torque.
(Four)Dwell angle Δ is obtained by controling winding magnetic linkage dwell angle computing moduleX st,, magnetic linkage dynamic angular Δ is obtained by PI torque controllerX d , sum of the two is next sampling periodT pwm Interior controling winding magnetic linkage change angle ΔX。
(Five)It is given using controling winding magnetic linkage amplitude
And calculated value
Exported through magnetic linkage pi regulator
.Controling winding magnetic linkage
、
And
Change angle Δ with controling winding magnetic linkage
XPass through controling winding magnetic linkage increment
Computing module calculates controling winding magnetic linkage increment
、
。
(Six)Utilize controling winding magnetic linkage increment
、
, pass through controling winding voltage
、
Computing module, calculates next cycle
T pwm Interior required voltage vector
、
。
(Seven)The basis of SVPWM generators 4
With
Modulated signal is generated, and passes through the controling winding of inverter control brushless dual-feed motor.
A kind of method for cage-type rotor brushless dual-feed motor Indirect UV detection, compared with prior art, the parameter of electric machine that this control system is used is only two stator winding resistances, the parameter of electric machine used is few, without rotating coordinate transformation, brushless dual-feed motor torque and the control of magnetic linkage are realized in rest frame, system control method is simple.Use output quantity that torque and magnetic linkage are adjusted respectively for continuous pi regulator, inverter is controlled using phase and amplitude variable resultant vector, the problem of control winding current harmonic wave is big when can efficiently solve brushless dual-feed motor Direct Torque Control low frequency, torque pulsation is big.
Embodiment
The embodiment to the present invention is further detailed below:
Such as Fig. 1, realize that a kind of method for cage-type rotor brushless dual-feed motor Indirect UV detection of the present invention is the device based on brushless dual-feed motor Indirect Stator-Quantities Control System, the device is by diode rectifier 1, filter capacitor 2, inverter 3, SVPWM generators 4, comparator 5, speed pi regulator 6, comparator 7, PI torque controller 8, controling winding magnetic linkage dwell angle calculates 9,
adder 10, comparator 11, magnetic linkage pi regulator 12, controling winding magnetic linkage increment
Calculate 13, controling winding voltage
、
Calculating 14, electromagnetic torque and power winding, the converter 16 of controling winding
flux linkage calculation 15,3/2, brushless dual-feed motor 17 are constituted;Six output ends of SVPWM generators 4 connect the control end of inverter 3, the output of speed pi regulator 6
With electromagnetic torque and power winding, the output of controling winding
flux linkage calculation 15
It is connected through comparator 7 with the input of PI torque controller 8,8 output end is connected in a positive input of
adder 10, another positive input of
adder 10 is the output that controling winding magnetic linkage dwell angle calculates 9, and the output end of
adder 10 is controling winding magnetic linkage increment
Calculate 13 one inputs, and 13 other 3 inputs are electromagnetic torque and power, the output of controling winding
flux linkage calculation 15 respectively
、
With the output of magnetic linkage pi regulator 12
, 12 input is that controling winding magnetic linkage amplitude gives
With by electromagnetic torque and power winding, the output of controling winding
flux linkage calculation 15
Through the value after comparator 11, controling winding magnetic linkage increment
The output of calculating 13 and controling winding voltage
、
The input for calculating 14 is connected, 14 output is connected with the input of SVPWM generators 4, the signal output part of 3/2 converter 16 is connected with electromagnetic torque and power winding, the input of controling winding
flux linkage calculation 15, inverter 3 is connected with the controling winding of brushless dual-feed motor 17, the rotating speed and speed preset of the brushless dual-feed motor 17 detected by code-disc
It is connected after comparator 5 with the input of speed pi regulator 6.
Realize that a kind of above-mentioned control method for cage-type rotor brushless dual-feed motor Indirect Torque is carried out by following step:
Step one:Controling winding, the A phases of power winding voltages electric current and B phase components are observed under three-phase static coordinate system
u ac 、
u bc 、
u ap 、
u bp 、i ac 、
i bc 、
i ap 、
i bp , three-phase/two-phase coordinate transform is carried out by 3/2 converter to above-mentioned physical quantity, controling winding and power winding is obtained each
Voltage and current under rest frame
、
、
、
、
i αc 、i βc 、i αp 、i βp。
Step 2:Utilize
、
、
、
、
i αc 、i βc 、i αp 、i βp With
u-iModel calculates controling winding magnetic linkage component by electromagnetic torque and power winding, controling winding
flux linkage calculation 15
、
With power winding magnetic linkage component
、
, according to
With
Calculate controling winding magnetic linkage amplitude
.Formula is as follows:
Wherein
、
Respectively controling winding and the phase resistance of power winding one;
、
It is controling winding
Magnetic linkage component under rest frame;
It is controling winding
Magnetic linkage amplitude under rest frame;
、
It is power winding
Magnetic linkage component under rest frame;
Step 3:Electromagnetic torque is calculated under controling winding and the respective rest frame of power winding by electromagnetic torque and power winding, controling winding flux linkage calculation 15 respectively.Formula is as follows:
Wherein
、
Respectively power winding and controling winding number of pole-pairs.
Step 4:Controling winding magnetic linkage changes angle ΔXCalculate, calculating 9 by controling winding magnetic linkage dwell angle first calculates dwell angle.Controling winding frequency is obtained by rotor speedf c, i.e.,
Wherein
For rotor speed,
It is power around class frequency,
For rotor windings number of pole-pairs,
Above "+" number represents metasynchronism state, and "-" number represents supersynchronous state;Dwell angle Δ
X st Calculated by following formula
Wherein
For controling winding angular frequency.Controling winding magnetic linkage dynamic angular Δ
X d By
T e *-
T e Obtained by pi regulator 8, then controling winding magnetic linkage change angle
Step 5:Utilize controling winding flux linkage set amplitude
And calculated value
Exported through magnetic linkage pi regulator 12
.Controling winding magnetic linkage
、
And
Change angle Δ with controling winding magnetic linkage
XPass through controling winding magnetic linkage increment
Calculate 13 and calculate controling winding magnetic linkage increment
、
, formula is as follows:
Step 6:Utilize controling winding magnetic linkage increment
、
Pass through controling winding voltage
、
14 are calculated, next cycle is calculated
T pwm Interior required voltage vector
、
, formula is as follows:
Step 7:The basis of SVPWM generators 4
With
Modulated signal is generated, and passes through the controling winding of the control brushless dual-feed motor 17 of inverter 3.
Using such scheme simulation result of the present invention as shown in Fig. 2~Fig. 6.Model machine parameter:Power winding is 6 poles, and controling winding is 2 poles, and power winding power 3KW, power winding connects 380V/50Hz power frequency supplies, controling winding power 1.5KW, the phase resistance of power winding one
R p =3.2 Ω, the phase resistance of controling winding one
R c =5.32 Ω, the phase resistance of rotor one
R r =0.173m Ω, inductance parameters:Power winding self-induction
L sp =292mH, power winding and rotor windings mutual inductance
L pr =2.16mH, controling winding self-induction
L sc =642mH, controling winding and rotor windings mutual inductance
L cr =4mH, rotor windings self-induction
L r =0.048mH, rotary inertia
J=0.064kg·m
2, flux linkage set

.Fig. 2 be the inventive method brushless dual-feed motor Indirect Stator-Quantities Control System given rotating speed from 705r/min (metasynchronism 3Hz) Spline smoothing to 795r/min (supersynchronous 3Hz) simulation result, show the feasibility of the inventive method.Fig. 3 and Fig. 4 are controling winding current simulations result under brushless dual-feed motor Direct Torque and the supersynchronous 3Hz stable situations of Indirect Stator-Quantities Control System respectively.The harmonic content that the visible frequency temporal of comparison diagram 3, Fig. 4 connects torque system controling winding electric current is substantially fewer than direct Torque Control.Fig. 5 and Fig. 6 be respectively brushless dual-feed motor Direct Torque and the supersynchronous 3Hz of Indirect Stator-Quantities Control System from zero load to load torque Spline smoothing before and after simulation result, the visible frequency temporal of comparison diagram 5, Fig. 6 connects moment controlling system torque pulsation and is obviously reduced.
Above-mentioned dynamic and static Simulation result shows the feasibility of brushless dual-feed motor Indirect UV detection method proposed by the present invention, compared with direct Torque Control, torque and the pulsation of rotating speed are significantly reduced during low frequency, and controling winding electric current is more preferable to sinusoidal approximation ratio, system has good follow and Immunity Performance.