CN102195547B - Indirect torque control method for cage-rotor brushless doubly-fed machine (BDFM) - Google Patents
Indirect torque control method for cage-rotor brushless doubly-fed machine (BDFM) Download PDFInfo
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- CN102195547B CN102195547B CN201110135710A CN201110135710A CN102195547B CN 102195547 B CN102195547 B CN 102195547B CN 201110135710 A CN201110135710 A CN 201110135710A CN 201110135710 A CN201110135710 A CN 201110135710A CN 102195547 B CN102195547 B CN 102195547B
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Abstract
A kind of Indirect UV detection method for cage-type rotor brushless dual-feed motor, including cage-type rotor brushless dual-feed motor Indirect UV detection method, the especially calculation method of control winding magnetic linkage variation angle Δ X, control winding frequency is first obtained by revolving speed, and then dwell angle Δ Xst is calculated by control winding frequency, dynamic angular Δ Xd is obtained by PI torque controller, the control winding magnetic linkage in sum of the two, that is, Tpwm of next sampling period changes angle Δ X. The present invention solves the problems, such as that control winding current harmonic wave is big when brushless dual-feed motor Direct Torque Control low frequency and torque pulsation is big, this control system only needs the resistance of two stator winding, and the required parameter of electric machine is few, is not necessarily to rotating coordinate transformation,
The control of cage-type rotor brushless dual-feed motor electromagnetic torque and magnetic linkage is realized under rest frame, control method is simple, and effect is obvious.
Description
Technical field
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 SVPWMThe 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 systemu 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 eachVoltage 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 toWithCalculate 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 amplitudeAnd calculated valueExported through magnetic linkage pi regulator.Controling winding magnetic linkage、AndChange angle Δ with controling winding magnetic linkageXPass through controling winding magnetic linkage incrementComputing module calculates controling winding magnetic linkage increment、。
(Six)Utilize controling winding magnetic linkage increment、, pass through controling winding voltage、Computing module, calculates next cycleT pwm Interior required voltage vector、。
(Seven)The basis of SVPWM generators 4WithModulated 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.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram that the inventive method is based on.
Fig. 2 is 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.
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.
Fig. 5 and Fig. 6 are the simulation result before and after brushless dual-feed motor Direct Torque and Indirect Stator-Quantities Control System load torque Spline smoothing respectively.
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 incrementCalculate 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 6With electromagnetic torque and power winding, the output of controling winding flux linkage calculation 15It 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 incrementCalculate 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 givesWith by electromagnetic torque and power winding, the output of controling winding flux linkage calculation 15Through the value after comparator 11, controling winding magnetic linkage incrementThe 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-discIt 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 systemu 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 eachVoltage and current under rest frame、、、、i αc 、i βc 、i αp 、i βp。
Step 2:Utilize、、、、i αc 、i βc 、i αp 、i βp Withu-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 toWithCalculate controling winding magnetic linkage amplitude.Formula is as follows:
Wherein、Respectively controling winding and the phase resistance of power winding one;、It is controling windingMagnetic linkage component under rest frame;It is controling windingMagnetic linkage amplitude under rest frame; 、It is power windingMagnetic 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:
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.,
WhereinFor 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 ΔX st Calculated by following formula
WhereinFor controling winding angular frequency.Controling winding magnetic linkage dynamic angular ΔX d ByT e *-T e Obtained by pi regulator 8, then controling winding magnetic linkage change angle
Step 5:Utilize controling winding flux linkage set amplitudeAnd calculated valueExported through magnetic linkage pi regulator 12.Controling winding magnetic linkage、AndChange angle Δ with controling winding magnetic linkageXPass through controling winding magnetic linkage incrementCalculate 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 calculatedT pwm Interior required voltage vector、, formula is as follows:
Step 7:The basis of SVPWM generators 4WithModulated 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 oneR p =3.2 Ω, the phase resistance of controling winding oneR c =5.32 Ω, the phase resistance of rotor oneR r =0.173m Ω, inductance parameters:Power winding self-inductionL sp =292mH, power winding and rotor windings mutual inductanceL pr =2.16mH, controling winding self-induction L sc =642mH, controling winding and rotor windings mutual inductanceL cr =4mH, rotor windings self-induction L r =0.048mH, rotary inertiaJ=0.064kg·m2, 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.
Claims (1)
1. a kind of Indirect UV detection method for cage-type rotor brushless dual-feed motor, it is to carry out through the following steps to realize the control method:
(One)Observe controling winding, power winding voltages, the A phases of electric current and B phase components respectively under three-phase static coordinate systemu ac 、u bc 、u ap 、u bp 、i ac 、i bc 、i ap Withi bp;3/2 converter is passed through to above-mentioned physical quantity(16)Coordinate transform is carried out, controling winding and power winding is obtained eachVoltage and current under rest frame、、、、i αc 、i βc 、i αp Withi βp;
(Two)Utilize、、、、i αc 、i βc 、i αp Withi βp Pass through electromagnetic torque and power winding, controling winding flux linkage calculation(15)Calculate controling winding magnetic linkage component、With power winding magnetic linkage component、, according toWithCalculate controling winding magnetic linkage amplitude;
(Three)Pass through electromagnetic torque and power winding, controling winding flux linkage calculation(15)Electromagnetic torque is calculated under controling winding and the respective rest frame of power winding respectively, sum of the two is total electromagnetic torque;
(Four)Calculated by controling winding magnetic linkage dwell angle(9)Dwell angle Δ Xst is obtained, passes through PI torque controller(8)Magnetic linkage dynamic angular Δ Xd is obtained, sum of the two is the controling winding magnetic linkage change angle Δ X in next sampling period Tpwm;
(Five)It is given using controling winding magnetic linkage amplitudeAnd calculated valueThrough magnetic linkage pi regulator(12)Output;Controling winding magnetic linkage、AndPass through controling winding magnetic linkage increment with controling winding magnetic linkage change angle Δ XCalculate(13)Calculate controling winding magnetic linkage increment、;
(Six)Utilize controling winding magnetic linkage increment、, pass through controling winding voltage、Calculate(14), calculate next cycleT pwm Interior required voltage vector、;
(Seven)SVPWM generators(4)According toWithModulated signal is generated, and passes through inverter(3)Control brushless dual-feed motor(17)Controling winding;
The controling winding magnetic linkage changes angle ΔXIt is calculated as follows:
Calculated first by controling winding magnetic linkage dwell angle(9)Calculate 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 ΔX st Calculated by following formula:
Wherein:For controling winding electric angle frequency, controling winding magnetic linkage dynamic angular ΔX d ByT e *-T e By pi regulator(8)Obtain, then controling winding magnetic linkage change angle:
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CN102364871B (en) * | 2011-10-24 | 2013-06-05 | 洛阳理工学院 | Method for directly controlling torque of induction motor and control device |
CN102738812B (en) * | 2012-07-13 | 2014-08-06 | 太原理工大学 | Indirect torque control cage type rotor brushless double-fed motor reactive power control method |
CN103516286B (en) * | 2013-08-09 | 2015-09-30 | 天津大学 | A kind of MC direct torque control improving input and output performance |
CN104518713B (en) * | 2014-12-17 | 2017-02-22 | 华中科技大学 | Position-sensor-free speed regulating control method for brushless doubly-fed motor |
CN104579060B (en) * | 2015-01-30 | 2017-10-24 | 太原理工大学 | The indirect power control method of cage-type rotor brushless dual-feedback wind power generator |
US10707789B2 (en) | 2017-05-12 | 2020-07-07 | General Electric Company | Adaptive current damping module for improved power converter control in wind turbine systems |
CN112542973B (en) * | 2020-12-03 | 2023-03-31 | 湖南航天磁电有限责任公司 | Control method of brushless double-fed induction motor under unbalanced power grid |
CN114329949B (en) * | 2021-12-26 | 2023-08-15 | 中国大唐集团新能源科学技术研究院有限公司 | Simulation modeling method for brushless doubly-fed motor of cage rotor |
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