CN205847137U - A kind of power drive system based on the quasi-Z-source inverter of switch inductive type - Google Patents
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type Download PDFInfo
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Abstract
This utility model relates to a kind of power drive system based on the quasi-Z-source inverter of switch inductive type, including the DC source being sequentially connected with, boosting driving transducer and motor, described boosting driving transducer is the quasi-Z-source inverter of switch inductive type, the described quasi-Z-source inverter of switch inductive type includes inverter impedance network and full-bridge inverter, described inverter impedance network input connects DC source, inverter impedance network outfan connects full-bridge inverter input, the motor described in the connection of full-bridge inverter outfan.Compared with prior art, power drive system of the present utility model solves that busbar voltage that conventional voltage type inverter causes is limited and Dead Time causes the problem that torque pulsation is big, electromagnetic noise is big, improve bus step-up ratio the most further, reduce voltage stress, improve system power-density.
Description
Technical field
This utility model relates to a kind of power drive system, especially relates to a kind of based on the quasi-Z source inversion of switch inductive type
The power drive system of device.
Background technology
In traditional power drive system, inverter is voltage source inverter, there is following deficiency:
(1) voltage source inverter busbar voltage is the output voltage of battery, is limited by cell voltage, and automobile is in climbing
With in accelerator, in the case of electricity deficiency, it may appear that Voltage Drop, cause motor output power not enough, in order to improve
The software feature of accumulator output, in fuel cell car and electric commercial vehicle generally outfan at battery increase one-level non-every
From BOOST circuit, after BOOST circuit brings the voltage up, supply three-phase full-bridge inverter drives motor, band prime DC/DC inversion
Device is two-stage circuit, and system entirety efficiency of transmission after Two Stages is relatively low.
(2) conventional voltage type inverter upper and lower bridge arm can not simultaneously turn on, and needs to increase Dead Time, but, during dead band
Between existence can make output voltage and electric current that distortion occurs, strengthen the torque pulsation of system, add the electromagnetic noise of system, shadow
Ring comfortableness and the reliability of electric drive system.
Z-source inverter is a kind of sigle-stage AC circuit topology, and its ultimate principle is to replace without increasing extra switching device
For traditional two-layer configuration, only realize the lifting of busbar voltage by introducing pass-through state, but traditional Z-source inverter is still
It is urgently to be resolved hurrily that so there are the following problems, and such as capacitance voltage stress is relatively big, and during startup, dash current is relatively big, discontinuous current problem with
And the system instability problem under the conditions of underloading.
Semiconductor material with wide forbidden band GaN have that energy gap is big, saturated electron drift velocity is high, critical breakdown electric field is big and
The features such as stable chemical nature.Therefore power electronic devices based on GaN material manufacture has that on state resistance is little, switching speed
The feature such as hurry up, high pressure and resistance to elevated temperatures is good.Different from SiC material, GaN in addition to can utilizing GaN material making devices,
Heterojunction structure specific to GaN can also be utilized to make high performance device.Wide bandgap semiconductor is improving the efficiency of system, reduction
Size and raising power density aspect have great advantage.The Z-source inverter being made up of GaN and derivative topology thereof, can be further
Improve switching frequency, improve system effectiveness and power density.
Utility model content
Defect that the purpose of this utility model is contemplated to overcome above-mentioned prior art to exist and provide a kind of based on
The power drive system of the quasi-Z-source inverter of switch inductive type
The purpose of this utility model can be achieved through the following technical solutions:
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type, including the DC source being sequentially connected with, liter
Pressure driving transducer and motor, described boosting driving transducer is the quasi-Z-source inverter of switch inductive type, described switch
The quasi-Z-source inverter of inductive type includes inverter impedance network and full-bridge inverter, and described inverter impedance network input is even
Connecing DC source, inverter impedance network outfan connects full-bridge inverter input, and full-bridge inverter outfan connects described
Motor.
Described inverter impedance network includes inductance L1, inductance L2, inductance L3, electric capacity C1, electric capacity C2, diode D7, two
Pole pipe D8, diode D9With diode D10, described inductance L1One end is inverter impedance network input anode, this impedance net
Network input anode connects DC power anode, described inductance L1The other end connects diode D7Anode, diode D7Negative electrode leads to
Cross inductance L2Connect diode D10Anode, diode D7Negative electrode is additionally coupled to diode D8Anode, diode D8Negative electrode passes through inductance
L3Connect diode D10Negative electrode, diode D9Anode connects diode D10Anode, diode D9Negative electrode connects diode D8Negative electrode,
Electric capacity C1Cathode connecting diode D10Negative electrode, electric capacity C1Negative pole connects diode D7Anode, electric capacity C2Cathode connecting diode D7Cloudy
Pole, diode D10Negative electrode is inverter impedance network output head anode, electric capacity C2Negative pole inputs for inverter impedance network simultaneously
End negative pole and inverter impedance network negative pole of output end, described inverter impedance network input cathode connects DC source
Negative pole, described inverter impedance network output head anode and inverter impedance network negative pole of output end are connected to full-bridge inverter
Input.
Described inductance L1, inductance L2With inductance L3Inductance value size is identical, described electric capacity C1With electric capacity C2Capacitance is big
Little identical.
Described full-bridge inverter is the three-phase full-bridge inverter of 6 switching tube compositions, the equal inverse parallel of each switching tube one
Diode, 6 described switching tubes are GaN wide bandgap semiconductor switching tube.
Described motor is three phase electric machine, and described three-phase full-bridge inverter outfan connects three phase electric machine.
Described power drive system also includes that control unit, described control unit include that processor, Hall current sense
Device, Hall voltage sensor and motor position sensor, three phase electric machine A phase and B phase connect a Hall current sensor respectively,
Described electric capacity C2Connecting and have a Hall voltage sensor, described motor position sensor is arranged on three phase electric machine, institute
Hall current sensor, Hall voltage sensor and the motor position sensor stated are connected to control unit, described control
Unit connects 6 switching tube grids of three-phase full-bridge inverter.
Described processor is digital signal processor.
Compared with prior art, this utility model has the advantage that
(1) the quasi-Z-source inverter of switch inductive type is in series by inverter impedance network and three-phase full-bridge inverter, inverse
Change device impedance network is inductance capacitance network, due to the existence of inductance capacitance network so that switch inductive type inverter possesses
Compare traditional Z source inventer and there is higher step-up ratio；
(2) inverter impedance network uses inductance and the combination of electric capacity, can be in conjunction with conventional voltage type inverter and electric current
The two-fold advantage of type inverter, when the quasi-Z-source inverter of switch inductive type works in voltage source inverter pattern, due to prime
The existence of inductance network, switch inductive type quasi-Z-source inverter main circuit can bear short time short circuit, this switch inductive type
Quasi-Z-source inverter becomes boost type inverter, reaches purpose of boosting, therefore so that three-phase full-bridge inverter works in
The state of lower bridge arm direct pass, it is to avoid the dead time effect that conventional voltage type inverter brings, improve inverter safety and
Reliability, inhibits the torque pulsation of motor to a certain extent and reduces the electromagnetic noise of motor, when Z-source inverter works
When current source inverter pattern, due to the existence of prime capacitance network, switch inductive type quasi-Z-source inverter main circuit is permissible
Bearing short time open circuit, this inverter becomes buck type inverter, reaches blood pressure lowering purpose, it is achieved output voltage adjustable；
(3) switching tube in full-bridge inverter is GaN wide bandgap semiconductor switching tube, can improve switch lock further
Rate, improves system effectiveness and power density.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of this utility model power drive system；
Fig. 2 is the electrical block diagram of this utility model power drive system；
Fig. 3 is the equivalent circuit diagram that three-phase full-bridge inverter works under effective vector state；
Fig. 4 is three-phase full-bridge inverter equivalent circuit diagram when working in upper and lower bridge arm pass-through state.
Wherein, 1 is battery module, and 2 is inverter impedance network, and 3 is full-bridge inverter, and 4 is motor, and 5 is single for controlling
Unit.
Detailed description of the invention
With specific embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.
Embodiment
As it is shown in figure 1, a kind of power drive system based on the quasi-Z-source inverter of switch inductive type, including be sequentially connected with
DC source, boosting driving transducer and motor 4, DC source uses battery module 1, and boosting driving transducer is switch
The quasi-Z-source inverter of inductive type, the quasi-Z-source inverter of switch inductive type includes inverter impedance network 2 and full-bridge inverter 3, inverse
Becoming device impedance network 2 input and connect DC source, inverter impedance network 2 outfan connects full-bridge inverter 3 input, entirely
Bridge inverter 3 outfan connects motor 4.
Concrete circuit structure as in figure 2 it is shown, wherein inverter impedance network 2 include inductance L1, inductance L2, inductance L3, electricity
Hold C1, electric capacity C2, diode D7, diode D8, diode D9With diode D10, inductance L1One end is that inverter impedance network 2 is defeated
Entering proper pole, this impedance network input anode connects DC power anode, inductance L1The other end connects diode D7Anode, two
Pole pipe D7Negative electrode passes through inductance L2Connect diode D10Anode, diode D7Negative electrode is additionally coupled to diode D8Anode, diode D8
Negative electrode passes through inductance L3Connect diode D10Negative electrode, diode D9Anode connects diode D10Anode, diode D9Negative electrode connects
Diode D8Negative electrode, electric capacity C1Cathode connecting diode D10Negative electrode, electric capacity C1Negative pole connects diode D7Anode, electric capacity C2Positive pole
Connect diode D7Negative electrode, diode D10Negative electrode is inverter impedance network 2 output head anode, electric capacity C2Negative pole is simultaneously for inversion
Device impedance network 2 input cathode and inverter impedance network 2 negative pole of output end, inverter impedance network 2 input cathode
Connecting DC power cathode, inverter impedance network 2 output head anode and inverter impedance network 2 negative pole of output end are connected to entirely
Bridge inverter 3 input.Inductance L1, inductance L2With inductance L3Inductance value size is identical, electric capacity C1With electric capacity C2Capacitance size phase
With.
Full-bridge inverter 3 is the three-phase full-bridge inverter of 6 switching tube compositions, and 6 switching tubes are T1～T6, each switching tube
All one diode of inverse parallel, is D in figure1～D6.6 switching tubes are GaN wide bandgap semiconductor switching tube.GaN broad stopband half
Conductor material has that energy gap is big, saturated electron drift velocity is high, critical breakdown electric field is big and the feature such as stable chemical nature,
Therefore switching frequency be can improve further, system effectiveness and power density improved.Motor 4 is three phase electric machine, three phase full bridge inversion
Device outfan connects three phase electric machine, and motor 4 can be permagnetic synchronous motor, asynchronous machine or DC brushless motor, this enforcement
Example uses permagnetic synchronous motor.Inverter impedance network 2 uses the combination of inductance and electric capacity, can be inverse in conjunction with conventional voltage type
Become device and the two-fold advantage of current source inverter, when the quasi-Z-source inverter of switch inductive type works in voltage source inverter pattern
Time, due to the existence of prime inductance network, switch inductive type quasi-Z-source inverter main circuit can bear short time short circuit, should
The quasi-Z-source inverter of switch inductive type becomes boost type inverter, reaches purpose of boosting, therefore so that three phase full bridge is inverse
Become device and work in the state that upper and lower bridge arm is straight-through, it is to avoid the dead time effect that conventional voltage type inverter brings, improve inversion
The safety and reliability of device, inhibits the torque pulsation of motor 4 to a certain extent and reduces the electromagnetic noise of motor 4,
When Z-source inverter works in current source inverter pattern, due to the existence of prime capacitance network, switch inductive type quasi-Z source
Converter main circuit can bear short time open circuit, and this inverter becomes buck type inverter, reaches blood pressure lowering purpose, thus realize
Output voltage adjustable.
Additionally this power drive system also includes that control unit 5, control unit 5 include processor, Hall current sensor, suddenly
That voltage sensor and motor position sensor, processor is digital signal processor, such as DSP or FPGA etc., three phase electric machine A phase
A Hall current sensor, electric capacity C is connected respectively with B phase2Connect and have a Hall voltage sensor, motor position sensor
Being arranged on three phase electric machine, Hall current sensor, Hall voltage sensor and motor position sensor are connected to control list
Unit 5, control unit 5 connects 6 switching tube grids of three-phase full-bridge inverter.The angle information warp of motor position sensor detection
Cross differential and obtain the square root modulus value as inverter outlet side of the angular rate of motor 4, quadrature-axis voltage and direct-axis voltage,
The two obtains electric capacity C by modulation saturation constraint2The set-point of voltage, electric capacity C2Voltage reference value and the difference of capacitance voltage value
Through PI controller, output is connected with amplitude limiter, and the output of amplitude limiter obtains straight-through dutycycle D.Thus processor exports 6 tunnels
PWM ripple realizes the control that 6 switching tubes are opened and closed.
Control unit 5 is by switch tube T1～T6The vector speed governing method of control realization motor 4, in switch tube T1
～T6Control time insert straight-through dutycycle and can realize the wide scope pressure regulation of Z-source inverter quasi-to switch inductive type,
The boosting principle specific implementation method of the quasi-Z-source inverter of switch inductive type is as follows:
Fig. 3 represents that three-phase full-bridge inverter works in the equivalent circuit diagram under effective vector state, effective work here
State is zero vector duty and the synthesized voltage vector duty of motor 4, remembers electric capacity C1With electric capacity C2Magnitude of voltage be designated as
Vc1And Vc2, inductance L1, inductance L2With inductance L3Magnitude of voltage be designated as VL1、VL2And VL3, the voltage of battery module 1 output is designated as
Vin, the voltage of input three-phase full-bridge inverter input is designated as VPN, there is following relationship according to Kirchhoff's law:
Fig. 4 represents equivalent circuit diagram when three-phase full-bridge inverter works in upper and lower bridge arm pass-through state, and pass-through state is
The basis of switch inductive type quasi-Z-source inverter boosting, is this type of inverter evident characteristic of being better than voltage source inverter, according to
There is following relationship in Kirchhoff's law:
Under limit, it is assumed that the control cycle is Ts, straight-through dutycycle is D, and the straight-through time is D Ts, active voltage vector
Action time is (1-D) Ts, according to inductance L2With inductance L3Upper voltage-second balance principle, can be obtained by formula (1) and formula (2):
(1-D)·(-Vc1-VL3)+D·Vc2=0 (3)
Abbreviation can obtain formula (4)
Under limit, it is assumed that the control cycle is Ts, straight-through dutycycle is D, and the straight-through time is D Ts, active voltage vector
Action time is (1-D) Ts, according to inductance L1Voltage-second balance principle, can be obtained by formula (1) and formula (2):
(1-D)·(Vin-Vc2)+D·(Vin+Vc1)=0 (5)
Abbreviation can obtain formula (6)
From formula (6), can be seen that the quasi-Z-source inverter of step-up ratio of the quasi-Z-source inverter of switch inductive type is high, electric capacity
Voltage stress is less.
The amount that in the present embodiment, control unit 5 gathers is permagnetic synchronous motor A phase current and B phase current, electric capacity C2Two ends
Voltage, the angle signal of permagnetic synchronous motor, the permagnetic synchronous motor A phase current gathered and B phase current pass through current sense
Device, exports the analog-digital converter (AD) to digital signal processor, the electric capacity C gathered2The voltage at two ends passes through voltage sensor
Device, exports the AD to digital signal processor, and the angle signal of described rotating transformer of permanent magnet synchronous motor output is through solving
Code chip obtains position signalling, and output is to digital signal processor.The control method of permagnetic synchronous motor uses vector controlled, gives
Determining signal is dtc signal, and dtc signal obtains permagnetic synchronous motor ac-dc axis through MTPA (maximum torque per ampere control)
Given value of current value, the A phase current gathered and B phase current obtain ac-dc axis current value, institute through PARK conversion and CLARK conversion
The direct-axis current reference value stated controls to obtain direct-axis voltage, described quadrature axis current reference value through PI with the difference of direct-axis current value
With the difference of quadrature axis current through PI obtain quadrature-axis voltage, quadrature-axis voltage and direct-axis voltage through anti-CLARK shift conversion be six tunnels
PWM1～PWM6 control signal.Electric capacity C2The set-point of voltage is to be determined by the controlled quentity controlled variable of permanent magnet synchronous electric pusher side, and angle is believed
Breath obtains the angular rate of permagnetic synchronous motor through differential, and described quadrature-axis voltage and the square root of direct-axis voltage are as three
The modulus value of phase full-bridge inverter outlet side, the two obtains the set-point of capacitance voltage by modulation saturation constraint.Described is straight
Logical dutycycle uses capacitance voltage closed loop control, it is characterised in that the quadrature-axis voltage of described permagnetic synchronous motor and d-axis electricity
The square root of pressure obtains the reference value of capacitance voltage, described capacitance voltage reference value and electric capacity electricity according to the difference of saturation
The difference of pressure value is connected with amplitude limiter through PI controller, output, and the output of amplitude limiter obtains straight-through dutycycle D.Here saturated
Degree is constrained to shown in formula (7), and saturation can characterize the restriction relation of boosting and modulation, and molecule represents that three-phase full-bridge inverter is defeated
The voltage of the permanent magnet synchronous electric pusher side gone out, denominator represents the voltage of input inverter, wherein udRepresent that conventional vector is straight when controlling
The output of shaft current PI type controller, uqRepresent the output of quadrature axis current PI type controller when conventional vector controls, represent as m ＜
When 0.8, being not inserted into straight-through dutycycle, inverter input ensures constant voltage mode, and permagnetic synchronous motor uses tradition SVPWM modulation methods
Method, when m >=0.8, inserts straight-through dutycycle, uses boosting raising speed mode, and permagnetic synchronous motor employing six sections is the most straight-through to account for
Empty than the SVPWM method inserted.
Can draw from the formula (4) derived, the electric drive of the quasi-Z-source inverter of switch inductive type of the present utility model
System realizes any lifting of voltage by controlling straight-through dutycycle D, and the voltage breaching conventional voltage type inverter limits,
Due to the addition of straight-through dutycycle, there is not Dead Time in inverter so that the current/voltage aberration rate of output reduces, torque arteries and veins
Dynamic reduction, the electromagnetic noise of power drive system reduces.
Claims (7)
1. a power drive system based on the quasi-Z-source inverter of switch inductive type, including the DC source being sequentially connected with, boosting
Driving transducer and motor, it is characterised in that described boosting driving transducer is the quasi-Z-source inverter of switch inductive type, institute
The quasi-Z-source inverter of switch inductive type stated includes inverter impedance network and full-bridge inverter, described inverter impedance net
Network input connects DC source, and inverter impedance network outfan connects full-bridge inverter input, and full-bridge inverter exports
Motor described in end connection.
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type the most according to claim 1, its feature exists
In, described inverter impedance network includes inductance L1, inductance L2, inductance L3, electric capacity C1, electric capacity C2, diode D7, diode
D8, diode D9With diode D10, described inductance L1One end is inverter impedance network input anode, and this impedance network is defeated
Enter proper pole and connect DC power anode, described inductance L1The other end connects diode D7Anode, diode D7Negative electrode is by electricity
Sense L2Connect diode D10Anode, diode D7Negative electrode is additionally coupled to diode D8Anode, diode D8Negative electrode passes through inductance L3Even
Meet diode D10Negative electrode, diode D9Anode connects diode D10Anode, diode D9Negative electrode connects diode D8Negative electrode, electric capacity
C1Cathode connecting diode D10Negative electrode, electric capacity C1Negative pole connects diode D7Anode, electric capacity C2Cathode connecting diode D7Negative electrode,
Diode D10Negative electrode is inverter impedance network output head anode, electric capacity C2Negative pole is that inverter impedance network input is born simultaneously
Pole and inverter impedance network negative pole of output end, described inverter impedance network input cathode connects DC source and bears
Pole, it is defeated that described inverter impedance network output head anode and inverter impedance network negative pole of output end are connected to full-bridge inverter
Enter end.
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type the most according to claim 2, its feature exists
In, described inductance L1, inductance L2With inductance L3Inductance value size is identical, described electric capacity C1With electric capacity C2Capacitance size phase
With.
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type the most according to claim 2, its feature exists
In, described full-bridge inverter is the three-phase full-bridge inverter of 6 switching tube compositions, one two pole of the equal inverse parallel of each switching tube
Pipe, 6 described switching tubes are GaN wide bandgap semiconductor switching tube.
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type the most according to claim 4, its feature exists
In, described motor is three phase electric machine, and described three-phase full-bridge inverter outfan connects three phase electric machine.
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type the most according to claim 5, its feature exists
Also include that control unit, described control unit include processor, Hall current sensor, suddenly in, described power drive system
That voltage sensor and motor position sensor, three phase electric machine A phase and B phase connect a Hall current sensor respectively, described
Electric capacity C2Connecting and have a Hall voltage sensor, described motor position sensor is arranged on three phase electric machine, described
Hall current sensor, Hall voltage sensor and motor position sensor are connected to control unit, described control unit
Connect 6 switching tube grids of three-phase full-bridge inverter.
A kind of power drive system based on the quasi-Z-source inverter of switch inductive type the most according to claim 6, its feature exists
In, described processor is digital signal processor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222134A (en) * | 2017-06-20 | 2017-09-29 | 天津大学 | The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222134A (en) * | 2017-06-20 | 2017-09-29 | 天津大学 | The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving |
| CN107222134B (en) * | 2017-06-20 | 2019-08-27 | 天津大学 | The brshless DC motor commutation torque ripple minimization method of noninductive Boost topology driving |
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