CN102882459B - Single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles - Google Patents
Single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles Download PDFInfo
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- CN102882459B CN102882459B CN201210404534.1A CN201210404534A CN102882459B CN 102882459 B CN102882459 B CN 102882459B CN 201210404534 A CN201210404534 A CN 201210404534A CN 102882459 B CN102882459 B CN 102882459B
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Abstract
The invention relates to a single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles. Six end leads of a stator winding of a three-phase permanent magnet synchronous motor are respectively connected to two standard two-level inverters. The driving system is supplied power by a direct-current power supply, and generates a rotary circular magnetic field by voltage space vector generated after space vector pulse width modulation. The driving system comprises a direct-current voltage source (1), a first inverter (2), a second inverter (3), a capacitor (4), an open-coil winding permanent magnet synchronous motor (5) and a common-mode voltage suppression vector (6). The first inverter is connected to one end of the winding of the permanent magnet synchronous motor, and the second inverter is connected to the other end of the winding. The drying system has advantages of a three-level inverter and can be applied to the field of driving of high-voltage high-power motors; while quantity of power devices is reduced. Owning to the compact design of the single supply, reliability of the driving system is improved. In addition, the effect of suppressing common-mode voltage can be achieved by effectively selecting the voltage space vectors on the basis of not increasing redundant switch devices.
Description
Technical field
The present invention relates to a kind of used for electric vehicle single supply and open winding permanent magnet Synchromous machine drive system, can be applicable to the driving occasion of high-tension high-power, belong to motor Driving technique.
Background technology
Magneto has that power density is high, the advantage such as large of exerting oneself, and can meet the requirement of low speed high torque, high power density, but exist adapt to that the range of speeds is narrower, the problem of weak magnetic speed-up and Regulation Control difficulty.Various countries scholar has proposed various corrective measures to magneto for this reason, as improve permanent magnet motor structure and magnetic circuit, the schemes such as new type composite excitation structure and special control strategy are proposed, although these schemes reach the object that regulates motor gas-gap magnetic field to a certain extent, but sacrificed the performance such as power density, efficiency of magneto self, reduced the superiority that magneto is applied to electric automobile.Takahashi I proposes a kind of winding open-circuit type asynchronous machine first, and its two ends connects 2 cover inverters.By each inverter, coordinate to control, the torque responsing speed and the frequency band range that improve asynchronous machine separate the connection neutral point of the threephase stator winding of permagnetic synchronous motor, make motor present out winding construction, each works alone mutually, effectively eliminate the impact between winding, improve the reliability of motor self, than traditional two-level inverter, the twin inverter structure of opening winding can make the harmonic content of output voltage reduce under lower switching frequency, output voltage grade improves, meanwhile, efficiently solve the problems such as used for electric vehicle magneto speed governing difficulty.Due to the not change of rotor magnetic circuit of magneto, motor has the advantages such as high power density, high efficiency.Therefore, be necessary to propose a kind of drive system based on driving winding type permagnetic synchronous motor.
Summary of the invention
Technical problem: the present invention is directed under on-vehicle battery capacity limit and power switch electric current and voltage capabilities limits driving power grade low, there is common-mode voltage, and there is the problems such as pressure regulation difficulty in existing used for electric vehicle drive system, propose used for electric vehicle single supply and open the drive system of winding permanent magnet synchronous machine, solve that in existing drive system, Driven by inverter power density is low, harmonic wave of output voltage is large and the problem such as weak-magnetic speed-regulating is difficult, adopt the supply power mode of single supply, the space vector modulation technique of twin inverter is improved simultaneously, can be suppressed common-mode voltage.Content of the present invention is opened winding permanent magnet synchronous machine drives performance and designs around used for electric vehicle single supply.
Technical scheme: for solving the problems of the technologies described above, the invention provides a kind of used for electric vehicle single supply and open winding permanent magnet Synchromous machine drive system, this drive system comprises direct voltage source, the first inverter, the second inverter, electric capacity, drives winding permanent magnet synchronous machine, common-mode voltage suppresses vector; The first inverter, the second inverter, Capacitance parallel connection are connected on the two ends of direct voltage source, the one end of opening three windings of winding permanent magnet synchronous machine is connected on respectively on three outputs of the first inverter, and the other end of opening three windings of winding permanent magnet synchronous machine is connected on respectively on three outputs of the second inverter; Common-mode voltage inhibition vector H, J, L, N, Q, S are modulated into 6 groups and drive signals, and correspondence connects 6 group transistor base stage control ends of the first inverter and the second inverter (3) respectively;
Permagnetic synchronous motor winding adopts leaves winding construction, and its six roots of sensation end lead-in wire is connected to respectively the two-level inverter of two standards, and drive system, only by a DC power supply, adopts the space vector of voltage that does not contain common-mode voltage during modulation.
DC power supply adopts the vehicle-mounted batteries of electric automobile that nominal voltage is 300V.
The first inverter and the second inverter are all voltage source inverters, and this twin inverter structure can realize three level outputs.
Twin inverter structure can produce 19 space vector of voltage in space, have 7 space vectors not produce common-mode voltage, and they are positioned at locus H, J, L, N, Q, S and O place; To being positioned at the voltage vector at H, J, L, N, Q, S and O place, modulate, can effectively suppress common-mode voltage.
Beneficial effect:
(1) twin inverter structure is compared common diode clamp type, leap capacitor type three-level inverter topology structure, reduced the quantity of power device, there is not the problems such as mid-point voltage imbalance, be specially adapted to electric automobile and drive operating mode, reduced volume, weight and the manufacturing cost of drive unit.
(2) each device for power switching only need be worked under 1/2 maximum supply power voltage, has reduced switching loss, and the efficiency of inverter is improved.
(3) traditional permagnetic synchronous motor threephase stator winding neutral point separately, can work alone motor winding, effectively eliminates the impact between winding, improves the reliability of motor self.
(4) the twin inverter structure of opening winding can make the harmonic content of output voltage reduce under lower switching frequency, and power output grade improves.
(5) adopt the powering mode of single supply, during modulation, by the effective selection to space vector of voltage, can suppress common-mode voltage, make the electric automobile can smooth-ride.
(6) open winding permanent magnet and synchronously possess very strong fault-tolerant ability, then in conjunction with high performance control algolithm, realize the uninterrupted operation of electric automobile, avoid accident and disaster to occur.
(7) design of single supply, system configuration is compacter, and is easy to the optimum management of accumulator cell charging and discharging, is applicable to the dynamical system of electric automobile.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein have: direct voltage source 1, the first inverter 2, the second inverter 3, electric capacity 4, drive winding permanent magnet synchronous machine 5, common-mode voltage and suppress vector 6.
Space vector of voltage distribution map when Fig. 2 is twin inverter power supply of the present invention.
Embodiment
The present invention will be described below with reference to accompanying drawings.
Used for electric vehicle single supply provided by the invention is opened winding permanent magnet Synchromous machine drive system, by three-phase permanent magnet synchronous motor stator winding neutral point separately, six roots of sensation end lead-in wire is connected to respectively the voltage-type two-level inverter of two standards, system, only by a DC power supply, can realize three level outputs.System had not only been inherited the advantage of three-level inverter but also had been reduced the quantity of power device, can be applicable to the driving fields higher to power requirement such as electric automobile; The compact design of single supply, has improved the reliability of installing, and has saved space, is not increasing the only effective selection to space voltage vector on Redundanter schalter device or control method basis simultaneously, just can play the effect that suppresses common-mode voltage.This device comprises direct voltage source 1, the first inverter 2, the second inverter 3, electric capacity 4, drives winding body permagnetic synchronous motor 5, common-mode voltage suppresses vector 6.Described first drives inverter 2 to connect one end of permagnetic synchronous motor winding, and the second inverter 3 is connected to the winding other end.Advantage of the present invention is: compare with existing common-mode voltage inhibition technology, only need effectively select space voltage vector just can suppress system common-mode voltage, torque ripple reduction; Compare with existing drive system of electric automobile, under on-vehicle battery capacity and power switch electric current and voltage capabilities limits, can improve system gross power, be easy to accumulator cell charging and discharging management optimization, improve runnability and the reliability of electric automobile.
The open electric automobile single supply of the present invention is opened winding permanent magnet Synchromous machine drive system, make full use of SVPWM principle, by effective selection of space vector of voltage, realize the output of non-common mode voltage, solved the large shortcoming of traditional PMSM Drive System torque pulsation, the design of single supply, makes power system of electric automobile overall structure compacter simultaneously, reduces the volume of device.This device is furnished with two mutual symmetry inverters, by a direct voltage source, powered, compare with traditional single inverter drive system, improved the utilance of DC power supply, harmonic wave of output voltage content is low, two inverter cooperatings, can realize three level outputs, and can under lower switching frequency, make the harmonic content of output voltage reduce.
Described the first inverter (2), the second inverter (3) are all two level PWM voltage source inverters of standard.
Described single supply (1) adopts the vehicle-mounted batteries of electric automobile that nominal voltage is 300V.
Described used for electric vehicle single supply is opened winding permanent magnet synchronous machine drives and is comprised the multiple drive forms such as vector control, direct torque control.
The present invention adopts space vector pulse width modulation, and whole system can obtain 26=64 on off state, but has redundancy in these 64 on off states, spatially can only produce 18 non-zero space vectors and 1 zero vector.For independent each inverter, may have common-mode voltage, but be superposeed by two inverter space vectors, blended space vector can not produce common-mode voltage for whole system.Choose different space vectors, the common-mode voltage ((u of generation
a1o+ u
b1o+ u
c1o-u
a2o'-u
b2o'-u
c2o')/3) difference.For 19 space vector of voltage as shown in Figure 2, there are 7 space vectors not produce common-mode voltage, they are positioned at locus H, J, L, N, Q, S and O place.To being positioned at the voltage vector at H, J, L, N, Q, S and O place, modulate, can effectively suppress common-mode voltage.
The foregoing is only better embodiment of the present invention; protection scope of the present invention is not limited with above-mentioned execution mode; in every case the equivalence that those of ordinary skills do according to disclosed content is modified or is changed, and all should include in the protection range of recording in claims.
Claims (1)
1. used for electric vehicle single supply is opened a winding permanent magnet Synchromous machine drive system, it is characterized in that: this drive system comprises direct voltage source (1), the first inverter (2), the second inverter (3), electric capacity (4), drives winding permanent magnet synchronous machine (5), common-mode voltage suppresses vector (6); The first inverter (2), the second inverter (3), electric capacity (4) are also connected in the two ends of direct voltage source (1), the one end of opening three windings of winding permanent magnet synchronous machine (5) is connected on respectively on three outputs of the first inverter (2), and the other end of opening three windings of winding permanent magnet synchronous machine (5) is connected on respectively on three outputs of the second inverter (3); Common-mode voltage inhibition vector (6) H, J, L, N, Q, S are modulated into 6 groups and drive signals, and correspondence connects 6 group transistor base stage control ends of the first inverter (2) and the second inverter (3) respectively;
Permagnetic synchronous motor winding adopts leaves winding construction, and its six roots of sensation end lead-in wire is connected to respectively the two-level inverter of two standards, and drive system, only by a DC power supply (1) power supply, adopts the space vector of voltage that does not contain common-mode voltage during modulation;
DC power supply (1) adopts the vehicle-mounted batteries of electric automobile that nominal voltage is 300V;
The first inverter (2) and the second inverter (3) are all voltage source inverters, and twin inverter structure realizes three level outputs;
Twin inverter structure can produce 19 space vector of voltage in space, have 7 space vectors not produce common-mode voltage, and they are positioned at locus H, J, L, N, Q, S and O place; To being positioned at the voltage vector at H, J, L, N, Q, S and O place, modulate, can effectively suppress common-mode voltage.
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| CN201210404534.1A CN102882459B (en) | 2012-10-22 | 2012-10-22 | Single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles |
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| CN201210404534.1A CN102882459B (en) | 2012-10-22 | 2012-10-22 | Single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles |
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| CN102882459B true CN102882459B (en) | 2014-12-17 |
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| CN105245146A (en) * | 2015-11-12 | 2016-01-13 | 西安理工大学 | Method for achieving unidirectional chaotic motion of rotating speed of permanent-magnet synchronous motor |
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