CN109495049A - Permanent magnetism vernier motor unity power factor Direct Torque Control based on striding capacitance - Google Patents
Permanent magnetism vernier motor unity power factor Direct Torque Control based on striding capacitance Download PDFInfo
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- CN109495049A CN109495049A CN201811439838.5A CN201811439838A CN109495049A CN 109495049 A CN109495049 A CN 109495049A CN 201811439838 A CN201811439838 A CN 201811439838A CN 109495049 A CN109495049 A CN 109495049A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
- H02P21/28—Stator flux based control
- H02P21/30—Direct torque control [DTC] or field acceleration method [FAM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/12—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
Abstract
The invention discloses a kind of permanent magnetism vernier motor unity power factor Direct Torque Control based on striding capacitance.Acquire information acquisition motor magnetic linkage and motor torque；Magnetic linkage amplitude reference value is obtained by every ampere of theory of torque capacity；Capacitance ratio integral controller is fed back to after capacitor bank voltage sampling, to calculate charging voltage reference value；Reference voltage vector is obtained using Vector Modulation type Direct Torque Control；Gained reference voltage vector is decoupled using instantaneous power theory, active voltage is distributed to power inverter, reference voltage vector needed for cooperating capacitor inverter to synthesize.The present invention enables to power inverter only to provide active power needed for motor operation, remaining reactive power is provided by capacitor inverter, electric system runs on unity power factor state, and torque and magnetic linkage pulsation can be reduced, fixed switching frequency, electromagnetic noise is reduced, realizes the high performance control of permanent magnetism vernier motor.
Description
Technical field
The present invention relates to permanent magnetism vernier motor fields more particularly to a kind of striding capacitance to open winding Direct Torque Control neck
Domain, it is specifically a kind of to open winding unity power factor Direct Torque Control, be conducive to improve permanent magnetism vernier motor power factor, change
The control performance of kind motor.
Background technique
With the fast development of the new and high technologies such as electric car, wind-power electricity generation, seawave power generation, wherein department of electrical engineering how is promoted
The efficiency of reliability and the energy conversion of system has become for the hot issue in these fields.Under this technical background, Yi Zhongyong
Magnetic vernier motor, with the simple feature of its high torque density and structure, being widely believed that has extensively in Direct Driving System
Wealthy application prospect.But the leakage field of traditional permanent magnetism vernier motor is larger, power factor is lower, generally requires to be equipped with larger appearance
The inverter of amount, this undoubtedly will increase the cost of system.Therefore, the raising of power factor to reduce system reactive power and mention
The efficiency of high drive system is most important.
On the other hand, since the voltage capacity of power device and current-carrying capability are limited, single two-level inverter is difficult to full
Sufficient high pressure, high-power applications demand.Compared to traditional two-level inverter, multi-electrical level inverter has electromagnetic noise low, harmonic wave electricity
It presses the advantages that small, has been successfully applied to high pressure, high-power and high reliability field.As one kind of multi-electrical level inverter, open around
Group drive system opens the neutral point of Y type stator winding, and six winding terminals are connected respectively to two two level inverse conversions of standard
Device.If opening in winding drive system inverter to be powered by striding capacitance, not only structure simplifies, and cost reduces, and
Constant-power speed range can be more than the maximum speed adjustable range of single inverter.
Since control structure is simple, response is widely used rapidly Direct Torque Control.Traditional Direct Torque Control
Using hysteresis comparator and switch list, to obtain quick dynamic response and good robustness, but torque and magnetic linkage are brought
Pulsation, unfixed switching frequency and electromagnetic noise.Space vector pulse width modulation type Direct Torque Control has many
Advantage, for example, better DC voltage utilization rate, lower torque pulsation, and be easier to realize in digit driver, because
This is more suitable for high reliability demand field.
Summary of the invention
The present invention problem low for permanent magnetism vernier motor power factor, function needed for decoupling motor using instantaneous power theory
Rate stream, whole reactive powers are provided by capacitor group, run electric system under unity power factor state, to obtain more
High voltage utilization rate.And by Synchronous Motor Using Space Vector Modulation Strategy of Direct Torque Control, reduces torque and magnetic linkage pulsation, fixed
Switching frequency, reduce electromagnetic noise.
For achieving the above object, the present invention adopts the following technical scheme:
A kind of permanent magnetism vernier motor unity power factor Direct Torque Control based on striding capacitance, including following step
It is rapid:
Construct controlled system: controlled system is made of permanent magnetism vernier motor and two sets of inverters；
Acquisition position sensor information obtains motor speed and position；Current sensor information is acquired, each phase of motor is obtained
Electric current after being coordinately transformed, calculates and obtains motor magnetic linkage and motor torque；
By motor actual speed compared with given speed, compares difference and be sent into speed PI controller to obtain motor operation institute
The torque reference needed, using torque capacity electric current than theoretical, calculating obtains Reference Stator Flux Linkage amplitude；By the motor torque and ginseng of estimation
It examines torque to compare, difference is sent into PI controller to obtain torque reference angle changing value；
The reference stator magnetic linkage ψ obtained using controllers *With torque reference angle changing value Δ δ, and the electricity that sampling obtains
The information such as seat in the plane sets, magnetic linkage carry out Vector Modulation type Direct Torque Control, calculate voltage arrow required when obtaining motor operation
Amount；
Capacitor bank voltage is acquired, compared with capacitance voltage given value, difference is sent into capacitor PI controller, obtains capacitor
Charge reference voltage ucpi；
Using instantaneous power theory, power needed for motor operation is decoupled, redistributes active power and idle function
Rate, in conjunction with capacitor charging reference voltage ucpiCalculate separately the reference voltage vector for obtaining two inverters；
The reference voltage vector of the two sets of inverters obtained will be calculated, using SVPWM technology, it is each to obtain two sets of inverters
The duty ratio of power device acts on correct voltage on motor.
Further, two sets of inverters are powered by DC power supply and capacitor group respectively, referred to as main inverter and capacitor inversion
Device.
Further, it calculates and obtains stator flux of motor and motor torque detailed process are as follows:
By motor three-phase current ia,ib,icIt by Clark coordinate transform, transforms under two-phase stationary coordinate system, to obtain
Motor α β shaft current i under the coordinate systemα,iβ；
The amplitude ψ of stator magnetic linkagesIt is calculated and is obtained by following formula:
Wherein ψα,ψβRespectively motor α β axis magnetic linkage；
It, can be in this coordinate system to motor torque T after obtaining motor α β shaft current and magnetic linkageeIt is estimated, it is specific to count
Calculation method is as follows:
Te=(3p/2) (ψαiβ-ψβiα)
Wherein p is motor number of pole-pairs.
Further, stator magnetic linkage ψ is referred to needed for motor operations *Amplitude is counted according to the torque capacity electric current for opening winding than theoretical
It obtains, specifically includes torque reference Te *Expression formula it is as follows:
Wherein ψfFor motor permanent magnet flux linkage amplitude, LqFor motor q axle inductance parameter.
Further, Vector Modulation type Direct Torque Control is carried out, voltage vector required when obtaining motor operation is calculated
Calculation formula are as follows:
Wherein Δ ψα,ΔψβFor magnetic linkage converted quantity, θsFor motor position, TsFor control system sampling period, RsFor motor electricity
Hinder parameter；ψsFor the amplitude of stator magnetic linkage.
Further, using instantaneous power theory, the detailed process that power needed for motor operation is decoupled are as follows:
Power needed for motor is correctly decoupled, whole active power needed for control main inverter provides motor operation, simultaneously
Capacitor inverter small electromotor reactive power is controlled, instantaneous power distribution principle is as follows:
Since two inverter buses are isolated, zero-sequence current problem is not present, it, can be in the hope of so according to instantaneous power theory
Instantaneous real power p and instantaneous reactive power q out:
To above formula both sides multiplied by the inverse matrix of current matrix, α β shaft voltage u is obtainedα,uβSuch as the function of electric current and power
Under:
Therefore the instantaneous active voltage u on α axis is definedαpWith the instantaneous active voltage u on β axisβp:
By above-mentioned principle, by α β shaft voltage reference vector uα *, uβ *It is decomposed into power component and reactive component, therefore main
The reference voltage vector u of inverter* MIα,u* MIβCalculation method is as follows:
Further, the reference voltage vector detailed process for obtaining two inverters is calculated are as follows:
Capacitance voltage is charged to a higher voltage class using lower DC bus-bar voltage by capacitance voltage control,
And it introduces PI controller and voltage control is carried out to capacitance voltage；
Capacitance voltage is fed back after pi controller, obtains capacitor charging reference voltage value ucpi, according to instantaneous function
Rate theory, the voltage should be filled with capacitor group by main inverter, obtain the reference of main inverter after considering capacitance voltage control
Voltage vector calculation method:
Wherein, u* MIα', u* MIβ' it is the reference voltage of final main inverter after considering capacitance voltage control；
In conjunction with winding voltage vector calculation formula is opened, the reference voltage vector u of capacitor inverter is found out* CIα,u* CIβ:
The beneficial effects of the present invention are:
1, for the present invention by utilizing instantaneous power theory, power flow needed for decoupling motor realizes electric system unit power
Factor control, reduces the idle pressure of main inverter and DC power supply, improves the power factor and efficiency of drive system；
2, using vector controlled modified Direct Torque Control, switching frequency is secured, torque and magnetic linkage are reduced
Pulsation.
3, control method proposed by the invention can satisfy the new and high technologies such as electric car, wind-power electricity generation, seawave power generation
The requirement of field high-precision operation, improves permanent magnetism vernier motor in the status in above-mentioned field.
Detailed description of the invention
Fig. 1 is the permanent magnetism vernier motor unity power factor Direct Torque Control block diagram based on striding capacitance；
Fig. 2 is to open voltage vector distribution map under winding topology；
Fig. 3 is the stator flux estimation block diagram based on current model；
Fig. 4 is system power flow diagram；
Fig. 5 is stator magnetic linkage tracing waveform figure；
Fig. 6 is electric moter voltage current phase relational graph.
Specific implementation
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.
As shown in Fig. 1 structural block diagram, the present invention is that the permanent magnetism vernier motor unity power factor based on striding capacitance is direct
Direct torque mainly includes instantaneous power decoupling distribution strategy and Vector Modulation type Direct Torque Control, concrete measure
It is as follows:
1, construct controlled system: controlled system is made of permanent magnetism vernier motor and two sets of inverters.
Control object of the present invention is to open winding permanent magnet vernier motor, i.e., opens the neutral point of motor script star-like connection,
Winding both ends are respectively connected to two sets of standard two-level inverters, and two sets of inverters are supplied by DC power supply and capacitor group respectively
Electricity, referred to as main inverter (MI) and capacitor inverter (CI).
2, acquisition position sensor information obtains motor speed and position；Current sensor information is acquired, it is each to obtain motor
Phase current after being coordinately transformed, calculates and obtains motor magnetic linkage and torque.
By motor three-phase current ia,ib,icIt by Clark coordinate transform, transforms under two-phase stationary coordinate system, to obtain
Current of electric i under the coordinate systemα,iβ.Specific transformation matrix of coordinates is as follows:
Mistake is given due to when speed operation electric motor resistance changes, may cause model parameter, therefore uses Fig. 3
Shown in current model estimate stator magnetic linkage, to reduce estimation error.The amplitude ψ of stator magnetic linkagesWith angle, θsCan by with
Lower expression formula, which calculates, to be obtained:
θs=tan-1(ψβ/ψα)
Wherein ψα,ψβRespectively motor α β axis magnetic linkage.
It, can be in this coordinate system to motor torque T after obtaining motor α β shaft current and magnetic linkageeIt is estimated, it is specific to count
Calculation method is as follows:
Te=(3p/2) (ψαiβ-ψβiα)
Wherein p is motor number of pole-pairs.
3, by motor actual speed compared with given speed, compare difference and be sent into speed PI controller to obtain motor operation
Required torque reference, using torque capacity electric current than theoretical, calculating obtains Reference Stator Flux Linkage amplitude；By the motor torque of estimation with
Torque reference compares, and difference is sent into PI controller to obtain torque reference angle changing value.
Stator magnetic linkage ψ is referred to needed for motor operations *Amplitude can compare theoretical calculation according to the torque capacity electric current for opening winding
It obtains, specifically includes torque reference Te *Expression formula it is as follows:
Wherein ψfFor motor permanent magnet flux linkage amplitude, LqFor motor q axle inductance parameter.
4, the reference stator magnetic linkage ψ obtained using controllers *It is obtained with torque reference angle changing value Δ δ, and sampling
The information such as motor position, magnetic linkage carry out Vector Modulation type Direct Torque Control, calculate voltage arrow required when obtaining motor operation
Amount.
Vector Modulation type Direct Torque Control is as follows:
First in the topology, since two inverter buses are electrically isolated from one, common-mode voltage does not have closed circuit, therefore not
The zero-sequence current that may damage power device and motor can be generated.Open the voltage vector obtained of motor under winding topology are as follows:
us=uINV1-uINV2
The vector distribution that two inverters generate jointly such as Fig. 2, shares 64 voltage vectors, therefore compared to single inverter
Topology, vector select freedom degree higher.
Mistake is given due to when speed operation electric motor resistance changes, may cause model parameter, therefore uses Fig. 3
Shown in current model estimate stator magnetic linkage, to reduce estimation error.The amplitude ψ of stator magnetic linkagesWith angle, θsCan by with
Lower expression formula, which calculates, to be obtained:
θs=tan-1(ψβ/ψα)
Stator magnetic linkage ψ is referred to needed for motors *Amplitude can be obtained according to the every ampere of theoretical calculation of torque capacity for opening winding,
It specifically include torque reference Te *Expression formula it is as follows:
Therefore stator magnetic linkage variable quantity and α β axis reference voltage can be calculated:
Wherein Δ ψα,ΔψβFor magnetic linkage converted quantity, θsFor motor position, TsFor control system sampling period, RsFor motor electricity
Hinder parameter.
5, capacitor bank voltage is acquired, compared with capacitance voltage given value, difference is sent into capacitor PI controller, obtains electricity
Capacity charge reference voltage ucpi。
6, using instantaneous power theory, power needed for motor operation is decoupled, redistribute active power with it is idle
Power calculates separately the reference voltage vector for obtaining two inverters in conjunction with capacitor.
Power needed for motor is correctly decoupled, in inventing proposed power distribution strategies, control main inverter is provided
Whole active power needed for motor operation, while controlling capacitor inverter small electromotor reactive power, specific flow of power such as Fig. 4
It is shown.Instantaneous power distribution principle is as follows:
Since two inverter buses are isolated, zero-sequence current problem is not present, it, can be in the hope of so according to instantaneous power theory
Instantaneous real power p and instantaneous reactive power q out:
To above formula both sides multiplied by the inverse matrix of current matrix, α β shaft voltage u is obtainedα,uβSuch as the function of electric current and power
Under:
Therefore the instantaneous active voltage u on α axis is definedαpWith the instantaneous active voltage u on β axisβp:
By above-mentioned principle, by α β shaft voltage reference vector uα *, uβ *It is decomposed into power component and reactive component, therefore main
The reference voltage vector u of inverter* MIα,u* MIβCalculation method is as follows:
Capacitance voltage is charged to a higher voltage class using lower DC bus-bar voltage by capacitance voltage control,
And introduce PI controller and voltage control is carried out to capacitance voltage, the principle is as follows:
Capacitance voltage is fed back after pi controller, obtains capacitor charging reference voltage value ucpi, according to instantaneous function
Rate theory, which should be filled with capacitor group by main inverter, therefore it can be concluded that consider main inversion after capacitance voltage control
The reference voltage vector calculation method of device:
Wherein, u* MIα', u* MIβ' it is the reference voltage of final main inverter after considering capacitance voltage control.
In conjunction with winding voltage vector calculation formula is opened, the reference voltage vector u of capacitor inverter can be found out* CIα,u* CIβ:
7, it is each to obtain two sets of inverters using SVPWM technology for the reference voltage vector that will calculate the two sets of inverters obtained
The duty ratio of a power device acts on correct voltage on motor；
Magnetic linkage track waveform when Fig. 5 is motor operation, stator magnetic linkage amplitude are about 0.18Wb, and right side is the magnetic linkage of synthesis
Circle, it can be seen that control strategy proposed by the invention can control the stator magnetic linkage of motor effectively as circle.
Fig. 6 is the voltage current phase relationship of motor, motor A phase current (ia) with the A phase voltage (u at main inverter enda1)
Remain same-phase, and the A phase voltage (u of capacitor inverter enda2) 90 ° of phase difference then is kept with electric current, this and emulation one
It causes, power flow needed for full decoupled motor.It is active that main inverter voltage with current of electric same-phase shows that the inverter only generates
Power alleviates the pressure of main inverter and DC power supply, and the reactive power needed when motor operation is then all inverse by capacitor
The capacitor group for becoming device end provides, therefore the contravarianter voltage and current of electric orthogonal relationship.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples "
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can be combined in any suitable manner in any one or more of the embodiments or examples.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (7)
1. a kind of permanent magnetism vernier motor unity power factor Direct Torque Control based on striding capacitance, which is characterized in that
The following steps are included:
Construct controlled system: controlled system is made of permanent magnetism vernier motor and two sets of inverters；
Acquisition position sensor information obtains motor speed and position；Current sensor information is acquired, each mutually electricity of motor is obtained
Stream after being coordinately transformed, calculates and obtains motor magnetic linkage and motor torque；
By motor actual speed compared with given speed, compares difference and be sent into speed PI controller to obtain needed for motor operation
Torque reference, using torque capacity electric current than theoretical, calculating obtains Reference Stator Flux Linkage amplitude；The motor torque of estimation and reference are turned
Moment ratio is compared with difference is sent into PI controller to obtain torque reference angle changing value；
The reference stator magnetic linkage ψ obtained using controllers *With torque reference angle changing value Δ δ, and the motor position that sampling obtains
It sets, the information such as magnetic linkage, carries out Vector Modulation type Direct Torque Control, calculate voltage vector required when obtaining motor operation；
Capacitor bank voltage is acquired, compared with capacitance voltage given value, difference is sent into capacitor PI controller, obtains capacitor charging
Reference voltage ucpi；
Using instantaneous power theory, power needed for motor operation is decoupled, redistributes active power and reactive power, is tied
Close capacitor charging reference voltage ucpiCalculate separately the reference voltage vector for obtaining two inverters；
The reference voltage vector of the two sets of inverters obtained will be calculated, using SVPWM technology, obtains two sets of each power of inverter
The duty ratio of device acts on correct voltage on motor.
2. the permanent magnetism vernier motor unity power factor Direct Torque Control side according to claim 1 based on striding capacitance
Method, which is characterized in that two sets of inverters are powered by DC power supply and capacitor group respectively, referred to as main inverter and capacitor inversion
Device.
3. the permanent magnetism vernier motor unity power factor Direct Torque Control side according to claim 1 based on striding capacitance
Method, which is characterized in that calculate and obtain stator flux of motor and motor torque detailed process are as follows:
By motor three-phase current ia,ib,icIt by Clark coordinate transform, transforms under two-phase stationary coordinate system, to obtain the seat
Mark is lower motor α β shaft current iα,iβ；
The amplitude ψ of stator magnetic linkagesIt is calculated and is obtained by following formula:
Wherein ψα,ψβRespectively motor α β axis magnetic linkage；
It, can be in this coordinate system to motor torque T after obtaining motor α β shaft current and magnetic linkageeIt is estimated, circular
It is as follows:
Te=(3p/2) (ψαiβ-ψβiα)
Wherein p is motor number of pole-pairs.
4. the permanent magnetism vernier motor unity power factor Direct Torque Control side according to claim 1 based on striding capacitance
Method, which is characterized in that stator magnetic linkage ψ is referred to needed for motor operations *Amplitude is counted according to the torque capacity electric current for opening winding than theoretical
It obtains, specifically includes torque reference Te *Expression formula it is as follows:
Wherein ψfFor motor permanent magnet flux linkage amplitude, LqFor motor q axle inductance parameter.
5. the permanent magnetism vernier motor unity power factor Direct Torque Control side according to claim 1 based on striding capacitance
Method, which is characterized in that carry out Vector Modulation type Direct Torque Control, calculate the meter of voltage vector required when obtaining motor operation
Calculate formula are as follows:
Wherein Δ ψα,ΔψβFor magnetic linkage converted quantity, θsFor motor position, TsFor control system sampling period, RsFor electric motor resistance ginseng
Number；ψsFor the amplitude of stator magnetic linkage.
6. the permanent magnetism vernier motor unity power factor Direct Torque Control side according to claim 1 based on striding capacitance
Method, which is characterized in that utilize instantaneous power theory, the detailed process decoupled to power needed for motor operation are as follows:
Power needed for motor is correctly decoupled, whole active power needed for control main inverter provides motor operation controls simultaneously
Capacitor inverter small electromotor reactive power, instantaneous power distribution principle are as follows:
Since two inverter buses are isolated, zero-sequence current problem is not present, so wink can be found out according to instantaneous power theory
When real power p and instantaneous reactive power q:
To above formula both sides multiplied by the inverse matrix of current matrix, α β shaft voltage u is obtainedα,uβFunction as electric current and power is as follows:
Therefore the instantaneous active voltage u on α axis is definedαpWith the instantaneous active voltage u on β axisβp:
By above-mentioned principle, by α β shaft voltage reference vector uα *, uβ *It is decomposed into power component and reactive component, therefore main inverter
Reference voltage vector u* MIα,u* MIβCalculation method is as follows:
7. the permanent magnetism vernier motor unity power factor Direct Torque Control side according to claim 1 based on striding capacitance
Method, which is characterized in that calculate the reference voltage vector detailed process for obtaining two inverters are as follows:
Capacitance voltage is charged to a higher voltage class using lower DC bus-bar voltage by capacitance voltage control, and is drawn
Enter PI controller and voltage control is carried out to capacitance voltage；
Capacitance voltage is fed back after pi controller, obtains capacitor charging reference voltage value ucpi, managed according to instantaneous power
By the voltage should be filled with capacitor group by main inverter, obtain the reference voltage of main inverter after considering capacitance voltage control
Vector calculation method:
Wherein, u* MIα', u* MIβ' it is the reference voltage of final main inverter after considering capacitance voltage control；
In conjunction with winding voltage vector calculation formula is opened, the reference voltage vector u of capacitor inverter is found out* CIα,u* CIβ:
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| CN110086398A (en) * | 2019-05-10 | 2019-08-02 | 华南理工大学 | A kind of Direct Torque Control based on duty ratio control |
| CN110086398B (en) * | 2019-05-10 | 2021-03-30 | 华南理工大学 | Direct torque control method based on duty ratio control |
| CN110492810A (en) * | 2019-08-28 | 2019-11-22 | 江苏大学 | A kind of magneto unity power factor field weakening control method based on striding capacitance |
| CN110620539A (en) * | 2019-09-25 | 2019-12-27 | 南京航空航天大学 | Direct torque control optimization method for open-winding motor under variable bus voltage working condition |
| CN111181465A (en) * | 2020-02-25 | 2020-05-19 | 浙江大学 | Direct torque control method and device for open-winding permanent magnet synchronous motor system |
| CN111181465B (en) * | 2020-02-25 | 2021-07-20 | 浙江大学 | Direct torque control method and device for open-winding permanent magnet synchronous motor system |
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