CN106505527A - Motor drive protection device, over-voltage protection method and transducer air conditioning - Google Patents

Motor drive protection device, over-voltage protection method and transducer air conditioning Download PDF

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Publication number
CN106505527A
CN106505527A CN201611181749.6A CN201611181749A CN106505527A CN 106505527 A CN106505527 A CN 106505527A CN 201611181749 A CN201611181749 A CN 201611181749A CN 106505527 A CN106505527 A CN 106505527A
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CN
China
Prior art keywords
voltage
value
bus
axles
motor
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CN201611181749.6A
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Chinese (zh)
Inventor
霍军亚
张国柱
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GD Midea Air Conditioning Equipment Co Ltd
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Guangdong Midea Refrigeration Equipment Co Ltd
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Priority to CN201611181749.6A priority Critical patent/CN106505527A/en
Publication of CN106505527A publication Critical patent/CN106505527A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

Abstract

The present invention provides a kind of Motor drive protection device, over-voltage protection method and transducer air conditioning; by increasing overvoltage crowbar in Motor drive protection device; its overvoltage crowbar is connected in parallel on dc bus; calculation control unit is by obtaining d-c bus voltage value; when d-c bus voltage value is more than the first preset value, calculation control unit control gate-controlled switch is turned on and causes load to access overvoltage crowbar to reduce d-c bus voltage value;When DC bus-bar voltage is less than the second preset value, calculation control unit control gate-controlled switch disconnects and load is broken from overvoltage crowbar.So that the high voltage fluctuation of the DC bus-bar voltage of pulsation is absorbed by overvoltage crowbar, it is to avoid occurring overvoltage on the DC bus-bar voltage of pulsation causes the filter capacitor in inverter and direct current smooth circuit to damage.

Description

Motor drive protection device, over-voltage protection method and transducer air conditioning
Technical field
The present invention relates to motor control technology field, more particularly to a kind of Motor drive protection device, over-voltage protection method And transducer air conditioning.
Background technology
With the lifting that consumer is required to electronic product energy saving, frequency conversion motor driver in hgher efficiency is got over It is widely applied to get over.The DC bus-bar voltage of conventional inverter driver is in steady statue, Converting Unit and input AC electricity Pressure is relatively independent, so that the control of Converting Unit need not consider the transient change of input voltage, is easy to the realization of control method. However, this method for designing needs to be equipped with the larger electrochemical capacitor of capacitance so that driver volume becomes big, cost.Additionally, The restricted lifetime of electrochemical capacitor, its effective time are often the bottleneck in driver life-span.
For the problems referred to above, relevant programme is proposed and replaces electrochemical capacitor with the thin-film electro of low-capacitance perhaps ceramic condenser Strategy, compared with conventional friendship orthogonal drive circuit, eliminates PFC parts, and the electric capacity of miniaturization can realize cost declining, Service life bottleneck that electrochemical capacitor cause can be eliminated again.But, due to the perhaps ceramic electrical of the thin-film electro on DC bus-bar voltage Hold capacitance very little, generally there was only the 1%-2% of conventional high-pressure electrochemical capacitor capacitance, when motor runs up, if it happens stop Electricity or other cancel closedowns, then reverse power generation understood by motor makes DC bus-bar voltage high voltage fluctuation occur, due to miniaturization Electric capacity can not absorb high voltage fluctuation, cause DC bus-bar voltage beyond motor inversion module and electric capacity pressure voltage when, easily Excessive pressure damages.
The above is only used for auxiliary and understands technical scheme, does not represent and recognizes that the above is existing skill Art.
Content of the invention
Present invention is primarily targeted at providing a kind of Motor drive protection device, over-voltage protection method and convertible frequency air-conditioner Device, it is therefore intended that solve, in the motor driver for electric capacity miniaturization, when high voltage occurs in dc bus to fluctuate, to cause DC bus-bar voltage is too high to cause motor inversion module and electric capacity excessive pressure damages problem.
For achieving the above object, a kind of Motor drive protection device that the present invention is provided, the Motor drive protection device Including:
Commutator, direct current smooth circuit, overvoltage crowbar, inverter, calculation control unit and motor;The commutator pair The AC-input voltage of alternating current power supply carries out all wave rectification, the two outfans connection dc bus of the commutator;The direct current Smooth circuit, inverter are in parallel with the dc bus successively, and the direct current smooth circuit is included with the dc bus simultaneously The capacitor of connection, the AC-input voltage by the commutator, the DC bus-bar voltage of direct current smooth circuit output ripple, To provide power supply as the inverter;The calculation control unit is controlled to inverter to be run with motor;
Overvoltage crowbar, between the commutator and inverter and in parallel with the dc bus, including controllable Switch and the load that connects with the gate-controlled switch;The control end of the gate-controlled switch is connected with the calculation control unit, described Calculation control unit obtains the d-c bus voltage value in real time, when the d-c bus voltage value is more than the first preset value, institute State calculation control unit and control the gate-controlled switch conducting so that it is described straight to reduce that the load accesses the overvoltage crowbar Stream bus voltage value;When the DC bus-bar voltage is less than the second preset value, calculation control unit control is described controllable to open Shut-off is opened so that the load is broken from overvoltage crowbar;
Wherein, first preset value is more than the second preset value.
Preferably, the calculation control unit controls gate-controlled switch conducting by pwm signal.
Preferably, the capacitor of the direct current smooth circuit is thin-film electro perhaps ceramic condenser, and capacitance is 10-30uF.
Preferably, the gate-controlled switch includes the first transistor, and the load includes first resistor, the first transistor Base stage connect the calculation control unit, the emitter stage of the first transistor connects the dc bus negative pole, described first One end of resistance connects the colelctor electrode of the first transistor, and the other end connects the dc bus positive pole.
Preferably, the calculation control unit includes:
Input voltage phase detects phase-locked loop module, for the instantaneous voltage of the alternating current power supply of acquisition input, and according to The instantaneous voltage of the alternating current power supply calculates input voltage phase estimated value;
Location/velocity estimator, for being estimated to obtain rotor angle estimated value to the rotor-position of the motor With motor speed estimated value;
The given current value computing module of Q axles, for according to motor rotating speed of target value, the motor speed estimated value and described Input voltage phase estimated value calculates the given current value of Q axles;
The given current value computing module of D axles, for the maximum output voltage according to the inverter and the inverter Output voltage amplitude calculates the given current value of D axles;
Current controller, for according to the given current value of the Q axles, the given current value of the D axles and Q axle actual currents The given magnitude of voltage of Q axles and the given magnitude of voltage of D axles are obtained with D axles actual current, to give according to the given magnitude of voltage of the Q axles and D axles Determine magnitude of voltage, the rotor angle estimated value and generate duty cycle control signal, and by controlling the inverter with to the electricity Machine is controlled.
Preferably, the given current value computing module of the Q axles includes:
Second pi regulator, carries out PI tune for the difference to the motor rotating speed of target value with the motor speed estimated value Section is with output torque amplitude set-point;
Waveform generator, for generating output variable according to the input voltage phase estimated value;
Initial current computing unit, for after the output variable is multiplied with the torque amplitude set-point divided by motor Moment coefficient gives current value initial value to obtain Q axles;
Condenser current compensation unit, for generating compensation electric current according to the input voltage phase estimated value;
Superpositing unit, for being added to the given current value initial value of the Q axles obtaining the Q axles by the compensation electric current Given current value.
Preferably, the given current value computing module of the D axles includes:
Weak magnetic controller, enters for the output voltage amplitude to the maximum output voltage of the inverter with the inverter Row calculates to obtain the given current value initial value of D axles;
Clipping unit, for carrying out amplitude limiting processing to obtain the given electricity of the D axles to the given current value initial value of the D axles Flow valuve.
For achieving the above object, the present invention also provides a kind of transducer air conditioning, and the transducer air conditioning includes above-mentioned motor Drive protection device.
For achieving the above object, the present invention also provides a kind of over-voltage protection method of transducer air conditioning, the convertible frequency air-conditioner The over-voltage protection method of device is comprised the following steps:
Real-time detection d-c bus voltage value;
When the d-c bus voltage value is more than the first preset value, controls the gate-controlled switch and turn on so that the load Access the overvoltage crowbar to reduce the d-c bus voltage value;When the DC bus-bar voltage is less than the second preset value When, controlling the gate-controlled switch disconnection and the load is broken from overvoltage crowbar, wherein described first preset value is big In the second preset value.
Preferably, the calculation control unit controls gate-controlled switch conducting by pwm signal.
The Motor drive protection device of the motor driven systems that the present invention is provided, by increasing in Motor drive protection device Overvoltage crowbar, its overvoltage crowbar are connected in parallel on dc bus, and calculation control unit passes through to obtain d-c bus voltage value, When d-c bus voltage value is more than the first preset value, calculation control unit control gate-controlled switch turns on and load access overvoltage is protected Protection circuit is reducing d-c bus voltage value;When DC bus-bar voltage is less than the second preset value, calculation control unit control is controllable Switch off and break from overvoltage crowbar so that loading, wherein the first preset value is more than the second preset value so that for electricity Hold in miniaturization motor driver, during for occurring high voltage fluctuation on dc bus, by the real-time of overvoltage crowbar Access so that the high voltage fluctuation of dc bus is absorbed by overvoltage crowbar, and then causes DC pulse moving voltage to be maintained at peace Below full magnitude of voltage, it is to avoid occurring overvoltage on DC pulse moving voltage causes the filter capacitor in inverter and direct current smooth circuit Device is damaged, and then improves the functional reliability of whole motor-drive circuit.
Description of the drawings
Fig. 1 is Motor drive protection device structural representation of the present invention;
Fig. 2 is the structural representation of the calculation control unit of Motor drive protection device of the present invention;
Fig. 3 is the structural representation that the voltage-phase of Motor drive protection device of the present invention detects phase-locked loop module;
Fig. 4 is the over-voltage protection method flow chart of convertible frequency air-conditioner of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The Motor drive protection device structural representation that Fig. 1 is provided for the present invention, for convenience of description, illustrate only and this The related part of embodiment, as shown in the figure:
A kind of Motor drive protection device that first embodiment of the invention is provided, including by alternating current input power supplying 1, commutator 2nd, the motor driver of direct current smooth circuit 3, overvoltage crowbar 4, inverter 5, calculation control unit 7 and motor 6 composition, its Middle commutator 2 connects alternating current input power supplying 1, and the full-bridge rectification being made up of diode D1-D4 is carried out to AC-input voltage 1 whole Stream, the two outfans connection dc bus of commutator, direct current smooth circuit 3, inverter 5 are in parallel with dc bus successively;Direct current Smooth circuit 3 includes the capacitor C1 in parallel with dc bus, and as capacitor C1 capacitances are relatively small, therefore commutator is defeated The DC voltage for going out is pulsating direct current busbar voltage after the filtering of direct current smooth circuit, it is impossible to be filtered into stable dc bus electricity Pressure, this pulsating direct current busbar voltage be inverter 5 provide work power supply, inverter 5 by calculation control unit 7 to its six Switching tube S1-S6 is controlled, and output three-phase current motor 6 runs, and inverter 5 is IPM (intelligent powers by inversion module Module) constitute.As the capacitor in direct current smooth circuit 3 in above-mentioned motor driver is than other motor drivers Capacitor in direct current smooth circuit is much smaller, the 1%-2% for typically there was only its capacitance, and capacitance is 10-30uF as only There is 20uF, because its capacitance is little, thin-film electro perhaps ceramic condenser can be chosen as, and the electric capacity in other direct current smooth circuits Device total capacity typically can reach 800uF, typically all jumbo electrochemical capacitor, and the therefore driving of referred to as electric capacity miniaturization is filled Put, based on the motor driver of this electric capacity miniaturization, compare the big motor driver of other capacitances, its main distinction is DC bus-bar voltage in electric capacity miniaturization motor driver is pulsating volage, and its voltage value is in cyclic fluctuation shape State, and in the big motor driver of capacitance, DC bus-bar voltage is burning voltage, there is no the pulsating volage corresponding cycle Property fluctuation.
The overvoltage crowbar 4 of above-mentioned Motor drive protection device is parallel on dc bus, before inverter 5, After may be located at direct current smooth circuit 3, it is also possible to after commutator 2,4 gate-controlled switch 402 of overvoltage crowbar and with The load 401 of the series connection of gate-controlled switch 402, the control end of gate-controlled switch 402 are connected with calculation control unit 7, and gate-controlled switch 402 is big The transistor of power such as metal-oxide-semiconductor or IGBT, load 401 can be resistive device, such as powerful resistance.Specific such as figure The physical circuit of the overvoltage crowbar 4 shown in 1, gate-controlled switch include that the first transistor S7, load 402 include first resistor The base stage concatenation operation control unit of R2, the first transistor S7, the emitter stage of the first transistor connect the dc bus negative pole, the One end of one resistance R2 connects the colelctor electrode of the first transistor S7, and the other end connects the dc bus positive pole.When transistor is led When logical, first resistor R2 is accessed in overvoltage crowbar 4, as first resistor R2 is high-power resistance, therefore can be undertaken straight The corresponding part of stream the provided power supply of bus is loaded, and then shares a part of operating current, when occurring voltage on dc bus During too high fluctuation, the electric current that the fluctuation of dc bus too high voltages brings can be just shared in the access of first resistor R2, and then reduces Which crosses the fluctuation voltage of high part.
Specifically, calculation control unit 7 obtains d-c bus voltage value by voltage detecting circuit, and this voltage detecting circuit is Prior art, is not repeating, and when d-c bus voltage value is more than the first preset value, calculation control unit 7 controls gate-controlled switch 402 Conducting causes load 401 to access overvoltage crowbar 4, supplies as overvoltage crowbar 4 assume responsibility for a part of DC bus-bar voltage To the electric current of inverter, DC bus-bar voltage therefore can be caused to reduce,;When DC bus-bar voltage is less than the second preset value, institute State calculation control unit to control the gate-controlled switch and disconnect the load is broken from overvoltage crowbar, wherein first is default Value is more than the second preset value.According to specific experiment, first preset value and the second preset value can determine that such as the first preset value is arranged For 480V, the second preset value is set to 460V, by overvoltage crowbar 4, can in real time to the appearance of DC pulse moving voltage Adjustment effect is played in overvoltage.
In due to electric capacity miniaturization motor driver, the capacitor in direct current smooth circuit is little, it is impossible to which smooth steady is straight The high voltage peak occurred on stream bus, such as runs up in motor and cause shutdown suddenly, electricity due to power failure or other exceptions When machine remains in operation under shutdown, meeting reverse power generation causes DC bus-bar voltage to raise, and high voltage occurs and fluctuates, and this high voltage Fluctuation can not be smoothed the capacitor of circuit and absorb, and therefore when high magnitude of voltage occurs in DC pulse moving voltage, lead to overvoltage protection Circuit 4 accesses dc bus so that the high voltage fluctuation of dc bus is absorbed by overvoltage crowbar, and then causes DC pulse Voltage is maintained at below safe magnitude of voltage, it is to avoid occurring overvoltage on DC pulse moving voltage causes inverter and direct current smooth circuit Filter capacitor C1 in 3 is damaged, and then improves the functional reliability of whole motor-drive circuit.
Further, control gate-controlled switch 402 in calculation control unit 7 to turn on so that load 401 accesses overvoltage crowbars 4 When, calculation control unit 7 can be turned on by pwm signal controlling switch 402, and such as with high level dutycycle as 50%, the cycle is 10KHz Pwm signal controlling switch 402 conducting, during due to being controlled with PWM, 402 for break-and-make switch state, which passes through to switch switch Average current less than with constant conducting state, such as with the PWM controlling switches 402 that high level dutycycle is 50%, then its The electric current theory for passing through is 50% of electric current when being turned on constant high level controlling switch 402, due to passing through electric current during 402 conducting Of a relatively high, so with PWM controlling switches 402 with regard to when just can reduce and pass through the average current for switching, and then can reduce controlling The device specification used by switch 402, it is possible to use the power tube of relatively low current, reduces cost.
The Motor drive protection device for providing according to embodiments of the present invention, by increasing overvoltage in Motor drive protection device Protection circuit, its overvoltage crowbar are connected in parallel on dc bus, and calculation control unit passes through to obtain d-c bus voltage value, when straight When stream bus voltage value is more than the first preset value, calculation control unit control gate-controlled switch is turned on and causes load to access overvoltage protection electricity Road is reducing d-c bus voltage value;When DC bus-bar voltage is less than the second preset value, calculation control unit controls gate-controlled switch Disconnect and load is broken from overvoltage crowbar, wherein the first preset value is more than the second preset value so that little for electric capacity In type motor driver, when occurring high voltage fluctuation on the DC bus-bar voltage for pulsation, by overvoltage crowbar Real-time access so that the DC bus-bar voltage of pulsation high voltage fluctuation absorbed by overvoltage crowbar, and then cause pulsation DC bus-bar voltage be maintained at below safe magnitude of voltage, it is to avoid overvoltage occur on the DC bus-bar voltage of pulsation causes inversion Filter capacitor in device and direct current smooth circuit is damaged, and then improves the functional reliability of whole motor-drive circuit.
Further, the second embodiment of the Motor drive protection device for providing as the present invention, the electricity based on the present invention Machine drives the first embodiment of protection device, the fortune of the second embodiment of the Motor drive protection device that Fig. 2 is provided for the present invention The structural representation of control unit is calculated, in the present embodiment, calculation control unit 7 includes:
Input voltage phase detects phase-locked loop module 71, for obtaining the instantaneous voltage of the alternating current power supply of input, and root Input voltage phase estimated value is calculated according to the instantaneous voltage of alternating current power supply;
Location/velocity estimator 74, for the rotor-position of motor is estimated with obtain rotor angle estimated value and Motor speed estimated value;
The given current value computing module 72 of Q axles, for according to motor rotating speed of target value, motor speed estimated value and input electricity Pressure phase estimation value calculates the given current value of Q axles;
The given current value computing module 73 of D axles, for the output electricity of maximum output voltage and inverter according to inverter Pressure amplitude value calculates the given current value of D axles;
Current controller 75, for according to the given current value of Q axles, the given current value of D axles and Q axles actual current and D axles Actual current obtains the given magnitude of voltage of Q axles and the given magnitude of voltage of D axles, with according to the given magnitude of voltage of Q axles and the given magnitude of voltage of D axles, Rotor angle estimated value generates duty cycle control signal, and motor is controlled by controlling inverter.
Wherein input voltage phase detection phase-locked loop module 71 may include cosine computer 714, the first multiplier 711, low Bandpass filter 712, the first pi regulator 713 and integrator 715, as shown in figure 3, cosine computer 714 is used for calculating to upper one Input voltage phase estimated values theta ge in cycle carries out cosine and calculates to obtain the first value of calculation, and the first multiplier 711 is used for handing over The instantaneous voltage Vac and the first value of calculation of stream power supply is multiplied to obtain the second value of calculation.Low pass filter 712 is used for second Value of calculation carries out low-pass filtering to obtain the 3rd value of calculation, and wherein, the bandwidth of the low pass filter 712 is less than the electricity of alternating current power supply Voltage-frequency rate, in one embodiment of the invention, the bandwidth of the low pass filter 712 is less than the electric voltage frequency ω g of alternating current power supply 1/5.First pi regulator 713 is used for carrying out the 3rd value of calculation PI regulations to export the 4th value of calculation, and integrator 715 is used for Is integrated by calculating to obtain the input electricity of current calculation cycle for electric voltage frequency ω g sum of 4th value of calculation with alternating current power supply Pressure phase estimation value θ ge.
Location/velocity estimator 74 is used for estimating to obtain rotor angle estimated values theta the rotor-position of motorest With motor speed estimated value ωest.The motor of the embodiment of the present invention can be the motor of position-sensor-free, at one of the present invention In embodiment, the above-mentioned functions of location/velocity estimator 74 can be realized by flux observation method.
Specifically, first can be according to the voltage V in two-phase rest frameα、VβWith electric current Iα、IβCalculate compression electromechanical The estimated value of machine useful flux in two-phase rest frame α and β direction of principal axis, is calculated as follows with specific reference to below equation (1):
Wherein,WithThe estimated value of respectively motor useful flux on α and β direction of principal axis, VαAnd VβRespectively α and β axles Voltage on direction, IαAnd IβElectric current respectively on α and β direction of principal axis, R is stator resistance, LqQ axle magnetic linkages for motor.
Then, the rotor angle estimated values theta of compressor electric motor is calculated according to following formula (2)estWith motor actual speed value Value ωest
Wherein, Kp_pllAnd Ki_pllRespectively proportional integral parameter, θerrFor misalignment angle estimated value, ωfFor speed low pass filtered The bandwidth of ripple device.
The given current value computing module 72 of Q axles is used for according to motor rotating speed of target value ω ref, motor speed estimated value ω Est and input voltage phase estimated values theta ge calculate the given current value Iqref of Q axles.
Specifically, as shown in Fig. 2 the given current value computing module 72 of Q axles include the second pi regulator, waveform generator, Initial current computing unit, condenser current compensation unit and superpositing unit.Wherein, the second pi regulator is used for turning motor target The difference of fast value ω ref and motor speed estimated value ω est carries out PI and adjusts with output torque amplitude set-point T0, waveform generator For generating output variable Wf according to input voltage phase estimated values theta ge.Initial current computing unit is used for output variable Wf Current value initial value Iq0 is given divided by motor torque COEFFICIENT K t to obtain Q axles after being multiplied with torque amplitude set-point T0.Electric capacity electricity Stream compensating unit is used for generating compensation electric current Iqcom according to input voltage phase estimated values theta ge, and superpositing unit is used for will compensation electricity Stream Iqcom is added to the given current value initial value Iq0 of Q axles obtaining the given current value Iqref of Q axles.
In an embodiment of the present invention, waveform generator can calculate output variable according to below equation:
Wherein, Wfge) it is according to input voltage phase estimated values thetageThe output variable of generation, θgeFor input voltage phase Estimated value, θdFor setting phase parameter.
In an embodiment of the present invention, condenser current compensation unit can calculate compensation electric current according to below equation:
Wherein, IqcomFor compensating electric current, θgeFor input voltage phase estimated value, θdFor setting phase parameter, C is to be connected in parallel on Capacitor's capacity between the input of inverter, VacmagFor the voltage magnitude of alternating current power supply, ωgVoltage frequency for alternating current power supply Rate, KtFor motor torque coefficient, ωeFor motor rotor speed.
In one embodiment of the invention, phase parameter θ is setdCan be the phase place corresponding to electric current dead band, specifically may be used Take 0.1~0.2rad.
The given current value computing module 73 of D axles is used for maximum output voltage Vmax and the output of inverter according to inverter Voltage magnitude V1 calculates the given current value Idref of D axles.
Specifically, as shown in Fig. 2 the given current value computing module 73 of D axles includes weak magnetic controller and clipping unit, its In, weak magnetic controller be used for calculating the maximum output voltage Vmax of inverter and the output voltage amplitude V1 of inverter with Obtain the given current value initial value Id0 of D axles, clipping unit be used for current value initial value Id0 given to D axles carry out amplitude limiting processing with Obtain the given current value Idref of D axles.
In an embodiment of the present invention, weak magnetic controller can calculate the given current value initial value of D axles according to below equation Id0:
Wherein, Id0For the given current value initial value of D axles, KiFor integral control coefficient, V1 For the output voltage amplitude of inverter, vdFor D shaft voltages, vqFor Q shaft voltages, VmaxFor the maximum output voltage of inverter, VdcFor The DC bus-bar voltage of motor.
In an embodiment of the present invention, clipping unit obtains the given current value of D axles according to below equation:
Wherein, IdrefFor the given current value of D axles, IdemagFor motor demagnetization current limits value.
Current controller 75 is used for according to the given current value Idref and Q axle reality of given current value Iqref, D axle of Q axles Electric current Iq and D axle actual current Id obtains the given magnitude of voltage Vd of the given magnitude of voltage Vq and D axle of Q axles, with according to the given magnitude of voltage of Q axles The given magnitude of voltage Vd of Vq and D axles, rotor angle estimated values theta est generate duty cycle control signal, and by control inverter 5 with Motor is controlled.
Wherein, three-phase current carries out coordinate transform and obtains d axles and q axle actual current values, specific as follows:
According to permagnetic synchronous motor U, V, W three-phase electricity flow valuve I that detection is obtainedu、Iv、Iw, and by carrying out Clark conversion, Based on following formula, electric current I of the motor in two-phase rest frame α and β direction of principal axis is obtainedαAnd Iβ
Iα=Iu
Park conversion is carried out further according to rotor angle estimated values theta est, two cordic phase rotators is calculated by following formula Actual current value Iq, Id of d axles and q axles under system.
Id=Iαcosθest+Iβsinθest
Iq=-Iαsinθest+Iβcosθest
Further, current controller 75 can calculate the given magnitude of voltage of Q axles and the given magnitude of voltage of D axles according to below equation:
Vd=Vd0- ω LqIq
Vq=Vq0+ωLdId+ωKe(8)
Wherein, Vq is the given magnitude of voltage of Q axles, and Vd is that D axles give magnitude of voltage, and Iqref for the given current value of Q axles, Idref is D axles give current value, and Iq is Q axle actual currents, and Id is D axle actual currents, and Kpd and Kid is respectively D shaft currents control ratio and increases Benefit and storage gain, Kpq and Kiq are respectively the control proportional gain of Q shaft currents and storage gain, and ω is motor speed, and Ke is electric Machine back emf coefficient, Ld and Lq are respectively D axles and Q axle inductances,Represent x (τ) integrations in time.
After the given magnitude of voltage Vd of the given magnitude of voltage Vq and D axle of Q axles is got, can be according to angle of rotor of motor estimated value θestPark inverse transformations are carried out to Vq and Vd, the magnitude of voltage V α and V β being fixed in coordinate system, concrete transformation for mula are as follows:
Wherein, θ is angle of rotor of motor, and here can use above-mentioned rotor angle estimated values theta est.
Further, Clark inverse transformations can be carried out according to the magnitude of voltage V α and V β that fixed coordinates are fastened, obtains three-phase voltage Vu, Vv and Vw, concrete transformation for mula are as follows:
Vu=Vα
Then dutycycle computing unit can carry out dutycycle calculating according to DC bus-bar voltage and three-phase voltage, obtain duty Than control signal, i.e. three-phase dutycycle Du, Dv and Dw, specific formula for calculation is as follows:
Du=(Vu+0.5Vdc)/Vdc
Dv=(Vv+0.5Vdc)/Vdc
Dw=(Vw+0.5Vdc)/Vdc(11)
Wherein, Vdc is DC bus-bar voltage.
Finally, according to three-phase dutycycle Du、Dv、DwThe switching tube of inverter is controlled, to realize the control to motor System.
Additionally, the present invention also provides a kind of transducer air conditioning, including above-mentioned Motor drive protection device, its transducer air conditioning Motor can be DC fan or compressor, its specific embodiment refers to above-mentioned Motor drive protection device and implements Example, will not be described here.
Transducer air conditioning provided in an embodiment of the present invention, by increasing overvoltage crowbar, its overvoltage crowbar is in parallel On dc bus, calculation control unit passes through to obtain d-c bus voltage value, when d-c bus voltage value is more than the first preset value When, calculation control unit control gate-controlled switch is turned on and causes load to access overvoltage crowbar to reduce d-c bus voltage value;When When DC bus-bar voltage is less than the second preset value, calculation control unit control gate-controlled switch disconnects and causes load from overvoltage crowbar Break, wherein the first preset value is more than the second preset value so that for the frequency conversion of application electric capacity miniaturization motor driver In air-conditioner, during for occurring high voltage fluctuation on dc bus, by the real-time access of overvoltage crowbar so that direct current is female The high voltage fluctuation of line is absorbed by overvoltage crowbar, and then causes the DC bus-bar voltage of pulsation to be maintained at safe magnitude of voltage Below, it is to avoid occurring overvoltage on the DC bus-bar voltage of pulsation causes the filter capacitor in inverter and direct current smooth circuit to damage Bad, improve the functional reliability of whole convertible frequency air-conditioner.
Further, the transducer air conditioning based on the embodiment of the present invention, the embodiment of the present invention also provide a kind of convertible frequency air-conditioner Over-voltage protection method, Fig. 4 is the flow chart of the over-voltage protection method of convertible frequency air-conditioner provided in an embodiment of the present invention, and the frequency conversion is empty The over-voltage protection method of tune is comprised the following steps:
S10, real-time detection d-c bus voltage value;
S20, when d-c bus voltage value is more than the first preset value, control gate-controlled switch is turned on and causes load to access overvoltage Protection circuit is reducing d-c bus voltage value;When DC bus-bar voltage is less than the second preset value, control gate-controlled switch disconnects So that the load is broken from overvoltage crowbar, wherein the first preset value is more than the second preset value.
The specific embodiment of the over-voltage protection method of its convertible frequency air-conditioner is shown in Motor drive protection device embodiment, and here is no longer Repeat.
The over-voltage protection method of the convertible frequency air-conditioner for providing according to embodiments of the present invention, by real-time detection DC bus-bar voltage Value, when d-c bus voltage value is more than the first preset value, control gate-controlled switch is turned on and causes load to access overvoltage crowbar To reduce d-c bus voltage value;When DC bus-bar voltage is less than the second preset value, control gate-controlled switch is disconnected so that described Load is broken from overvoltage crowbar, and wherein the first preset value is more than the second preset value so that for application electric capacity miniaturization In the transducer air conditioning of motor driver, during for occurring high voltage fluctuation on dc bus, by overvoltage crowbar Access in real time so that the high voltage fluctuation of the DC bus-bar voltage of pulsation is absorbed by overvoltage crowbar, and then causes pulsation DC bus-bar voltage is maintained at below safe magnitude of voltage, it is to avoid overvoltage occur on the DC bus-bar voltage of pulsation causes inverter Damage with the filter capacitor in direct current smooth circuit, improve the functional reliability of whole convertible frequency air-conditioner.
The preferred embodiments of the present invention are these are only, the scope of the claims of the present invention is not thereby limited, every using this Equivalent structure or equivalent flow conversion that bright description and accompanying drawing content are made, or directly or indirectly it is used in other related skills Art field, is included within the scope of the present invention.

Claims (10)

1. a kind of Motor drive protection device, it is characterised in that the Motor drive protection device includes:
Commutator, direct current smooth circuit, overvoltage crowbar, inverter, calculation control unit and motor;The commutator is to exchange The AC-input voltage of power supply carries out all wave rectification, the two outfans connection dc bus of the commutator;The direct current is smoothed Circuit, inverter are in parallel with the dc bus successively, and the direct current smooth circuit include in parallel with the dc bus Capacitor, the AC-input voltage are thought by the commutator, the DC bus-bar voltage of direct current smooth circuit output ripple The inverter provides power supply;The calculation control unit is controlled to inverter to be run with motor;
Overvoltage crowbar, between the commutator and inverter and in parallel with the dc bus, including gate-controlled switch And the load that connects with the gate-controlled switch;The control end of the gate-controlled switch is connected with the calculation control unit, the computing Control unit obtains the d-c bus voltage value in real time, when the d-c bus voltage value is more than the first preset value, the fortune Calculate control unit and control the gate-controlled switch conducting so that it is female to reduce the direct current that the load accesses the overvoltage crowbar Line voltage value;When the DC bus-bar voltage is less than the second preset value, the calculation control unit controls the gate-controlled switch and breaks Open so that the load is broken from overvoltage crowbar;
Wherein, first preset value is more than the second preset value.
2. Motor drive protection device as claimed in claim 1, it is characterised in that the calculation control unit passes through pwm signal Control gate-controlled switch conducting.
3. Motor drive protection device as claimed in claim 1, it is characterised in that the capacitor of the direct current smooth circuit is Thin-film electro perhaps ceramic condenser, capacitance is 10-30uF.
4. Motor drive protection device as claimed in claim 1, it is characterised in that the gate-controlled switch includes first crystal Pipe, the load include that first resistor, the base stage of the first transistor connect the calculation control unit, the first transistor Emitter stage connect the dc bus negative pole, one end of the first resistor connects the colelctor electrode of the first transistor, separately One end connects the dc bus positive pole.
5. Motor drive protection device as claimed in claim 1, it is characterised in that the calculation control unit includes:
Input voltage phase detects phase-locked loop module, for obtaining the instantaneous voltage of the alternating current power supply of input, and according to described The instantaneous voltage of alternating current power supply calculates input voltage phase estimated value;
Location/velocity estimator, for being estimated to obtain rotor angle estimated value and electricity to the rotor-position of the motor Motor speed estimated value;
The given current value computing module of Q axles, for according to motor rotating speed of target value, the motor speed estimated value and the input Voltage-phase estimated value calculates the given current value of Q axles;
The given current value computing module of D axles, for the output of the maximum output voltage according to the inverter and the inverter Voltage magnitude calculates the given current value of D axles;
Current controller, for according to the given current value of the Q axles, the given current value of the D axles and Q axles actual current and D Axle actual current obtains the given magnitude of voltage of Q axles and the given magnitude of voltage of D axles, with according to the given magnitude of voltage of the Q axles and the given electricity of D axles Pressure value, the rotor angle estimated value generate duty cycle control signal, and the motor are entered by controlling the inverter Row control.
6. Motor drive protection device as claimed in claim 5, it is characterised in that the given current value computing module of the Q axles Including:
Second pi regulator, for the difference of the motor rotating speed of target value and the motor speed estimated value is carried out PI adjust with Output torque amplitude set-point;
Waveform generator, for generating output variable according to the input voltage phase estimated value;
Initial current computing unit, for after the output variable is multiplied with the torque amplitude set-point divided by motor torque Coefficient gives current value initial value to obtain Q axles;
Condenser current compensation unit, for generating compensation electric current according to the input voltage phase estimated value;
Superpositing unit, for giving the compensation electric current given current value initial value of the Q axles that is added to obtain the Q axles Current value.
7. Motor drive protection device as claimed in claim 5, it is characterised in that the given current value computing module of the D axles Including:
Weak magnetic controller, carry out by the output voltage amplitude of the maximum output voltage to the inverter and the inverter based on Calculate to obtain the given current value initial value of D axles;
Clipping unit, for carrying out amplitude limiting processing to obtain the given electric current of the D axles to the given current value initial value of the D axles Value.
8. a kind of transducer air conditioning, it is characterised in that the transducer air conditioning includes motor as described in claim 1 to 7 is arbitrary Drive protection device.
9. a kind of over-voltage protection method of transducer air conditioning as claimed in claim 8, it is characterised in that the transducer air conditioning Over-voltage protection method comprise the following steps:
Real-time detection d-c bus voltage value;
When the d-c bus voltage value is more than the first preset value, controls the gate-controlled switch and turn on so that the load is accessed The overvoltage crowbar is reducing the d-c bus voltage value;When the DC bus-bar voltage is less than the second preset value, Control the gate-controlled switch and disconnect the load is broken from overvoltage crowbar, wherein described first preset value is more than the Two preset values.
10. the over-voltage protection method of transducer air conditioning as claimed in claim 8, it is characterised in that the calculation control unit is led to Cross pwm signal control gate-controlled switch conducting.
CN201611181749.6A 2016-12-19 2016-12-19 Motor drive protection device, over-voltage protection method and transducer air conditioning Pending CN106505527A (en)

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PCT/CN2017/105418 WO2018113388A1 (en) 2016-12-19 2017-10-09 Motor driving protection device, over-voltage protection method and inverter air conditioner

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CN110572023A (en) * 2019-09-29 2019-12-13 英麦科(厦门)微电子科技有限公司 PFC circuit, current compensation method of input capacitor of PFC circuit and power conversion circuit
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