CN107070361B - A kind of SVPWM control method reducing six-phase motor common-mode voltage - Google Patents
A kind of SVPWM control method reducing six-phase motor common-mode voltage Download PDFInfo
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- CN107070361B CN107070361B CN201710201884.0A CN201710201884A CN107070361B CN 107070361 B CN107070361 B CN 107070361B CN 201710201884 A CN201710201884 A CN 201710201884A CN 107070361 B CN107070361 B CN 107070361B
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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
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Abstract
The present invention provides a kind of SVPWM control method for reducing six-phase motor common-mode voltage, is related to the control technology field of multiphase motor.This method utilizes the characteristics of voltage vector redundancy in six-phase motor control, reduce the voltage vector selection of common-mode voltage SVPWM control strategy, suitable four effective voltage vectors are selected in numerous vectors, while being handled the Zero voltage vector that common-mode voltage amplitude changes greatly is influenced.A kind of SVPWM control method reducing six-phase motor common-mode voltage provided by the invention, the common-mode voltage at stator node can be largely reduced in the case where guaranteeing that harmonic wave does not have increased situation.
Description
Technical field
The present invention relates to the control technology field of multiphase motor more particularly to a kind of reduction six-phase motor common-mode voltages
SVPWM (Space Vector Pulse Width Modulation, i.e. space vector pulse width modulation) control method.
Background technique
Motor has been widely used in the various aspects of production and living, as people want product and quality of life
The continuous improvement asked has higher requirement for the motor as the life tool of production.Multiphase motor possesses rotation arteries and veins
Move it is small, suitable for low-pressure high-power, harmonic wave is small, error resilience performance is good, noise is small energy saving the advantages that increasingly by people's
Concern.At present polyphase machine be chiefly used in aerospace, accurate medical instrument, military affairs, ship naval vessels etc. to the reliability of motor,
The higher field of control accuracy requirement, but with the rise of other industry, polyphase machine will widely enter people
Life in, especially present rail traffic and the electric car field that will be popularized, polyphase machine are certain to performer and get over
Carry out more important role.
In terms of the control of multiphase motor, usually used is DC power supply power supply, using control signal to inverter
Output pulse controlled.In this process, the voltage in motor stator child node is exactly the flat of each phase voltage amplitude
Mean value, by taking threephase motor as an example, the voltage at node isDue to the arrow of control Signal-controlled switch pipe effect
Amount is different, make-and-break time is different, ua+ub+ucIt is no longer 0, voltage at node will change always.The contradiction faced in this way
Be the inverter used if harmonic wave to be reduced switching tube frequency it is just very high, but will lead to stator voltage at node variation
Fastly, common-mode voltage increases.If the degree that common-mode voltage reaches the insulation oil film on breakdown bearing will generate shaft current, subtract
The service life of small size motor, and such case is present on various motors.And for facing in traditional multi-phase motor control
Another problem is, the method for use is adjacent maximum four-vector control method, according to the study found that this method at one
It is difficult to realize in PWM cycle, and in one cycle, the variation of stator voltage at node is multiple, if frequency of use is biggish
Frequency converter will generate biggish common-mode voltage.And the control for traditional Multi-phase permanent-magnet motor with adjacent two vector,
Harmonic wave plane voltage vector synthesized voltage vector is big, can generate biggish harmonic wave.
Summary of the invention
In view of the drawbacks of the prior art, the present invention provides a kind of SVPWM controlling party for reducing six-phase motor common-mode voltage
Common-mode voltage at node is greatly lowered according to the principle that common-mode voltage generates in method, can be symmetrical in a PWM cycle
It realizes without increasing harmonic wave.
A kind of SVPWM control method reducing six-phase motor common-mode voltage, comprising the following steps:
Step 1: according to the analysis to salient-pole synchronous motor harmonic wave, all voltage vectors being divided into an energy containing Organic Electricity
Measure the α β first harmonic spatial of conversion and (z1z2), the space (o102) of only harmonic wave；
Step 2: the α β first harmonic spatial with energy converting between mechanical being divided into 12 sectors, selects four in each sector
A effective voltage vector, specific choice method are as follows:
Step 2.1: selecting two adjacent maximum voltage vectors as first electricity of the sector in each sector
Press second voltage vector of vector sum；
Step 2.2: according to electricity at two individual stator nodes when first voltage vector and second voltage vector effect
The situation of change of pressure selects the third voltage vector and the 4th voltage vector of the sector, method particularly includes:
Step 2.2.1: it when first voltage vector and second voltage vector effect, analyzes at first stator node
The situation of change of common-mode voltage amplitude, if common-mode voltage amplitude remains unchanged at first stator node, selection is sent as an envoy to
Several voltage vectors for the voltage vector type that common-mode voltage amplitude still remains unchanged at first stator node, if first
Common-mode voltage amplitude changes at stator node, then sends as an envoy to first and determine according to the common-mode voltage amplitude situation selection after variation
Common-mode voltage amplitude remains several voltage vectors of the voltage vector type of the common-mode voltage amplitude after variation at child node；
Step 2.2.2: it when first voltage vector and second voltage vector effect, analyzes at second stator node
The situation of change of common-mode voltage amplitude, if common-mode voltage amplitude remains unchanged at second stator node, selection is sent as an envoy to
Common-mode voltage amplitude still keeps several voltage vectors of constant voltage vector type at second stator node, if second
Common-mode voltage amplitude changes at a stator node, then sends as an envoy to second according to the common-mode voltage amplitude situation selection after variation
Common-mode voltage amplitude remains several voltage vectors of the voltage vector type of the common-mode voltage amplitude after variation at stator node；
Step 2.2.3: it is selected in all qualified voltage vectors selected in step 2.2.1 and step 2.2.2
Contrary several voltage vectors combination；It is highest that busbar voltage utilization rate is selected from several voltage vector combinations again
One group of voltage vector combination, the combination are the combination for including third voltage vector and the 4th voltage vector；
Step 3: the action time of four voltage vectors is calculated according to voltage-second balance principle, if calculated without ovennodulation
The action time of Zero voltage vector out；
Step 4: the action time of Zero voltage vector being handled as follows, final third voltage vector and is obtained
The action time of four voltage vectors: the action time for the Zero voltage vector that step 3 is calculated swears according to third voltage
The amplitude size inverse proportion of amount and the 4th voltage vector is divided into two parts, is then added separately to this two parts action time
In the action time of third voltage vector and the 4th voltage vector that step 3 is calculated.
Further, the voltage vector type is divided into A type and Type B, is defined with the following method:
V is defined firstxyIndicate voltage vector, wherein x represents the switch combination on first node, and y represents second section
Switch combination on point, and the numerical value value of x and y is 1,2 ..., 6, and with the corresponding triad coded representation section of numerical value
The switch state of point switch combination respectively represents the on and off of bridge arm on inverter with 1 and 0,0 represents disconnection, and 1 representative is led
It is logical；
When the switch state of Node Switch combination is there are at two 1, when as 011,101 or 110 act on, the node is average
Voltage is udc/ 6, these three groups are collectively referred to as A type；When the switch state of Node Switch combination is there are at two 0, as 001,
When 010 or 100 effect, which is-udc/ 6, these three groups are collectively referred to as Type B, wherein udcFor bus bar side voltage.
Further, step 2.2.1 method particularly includes:
Judge that the switch combination of first voltage vector and second voltage vector at first node is A type or B
Type, if being all A type or being all Type B, in selected third voltage vector and the 4th voltage vector in first section
The switch combination of point is also all A type or is all Type B；If from first voltage vector to second voltage vector at first
The switch combination of node changes to Type B from A type, it is determined that third voltage vector and the 4th voltage vector are in first node
Switch combination is all Type B；If from first voltage vector to second voltage vector in the switch combination of first node from B
Type changes to A type, it is determined that third voltage vector and the 4th voltage vector are all A type in the switch combination of first node；
Step 2.2.2's method particularly includes:
Judge that the switch combination of first voltage vector and second voltage vector at second node is A type or B
Type, if from first voltage vector to switch combination of second voltage vector at second node being all A type or all
For Type B, then select third voltage vector and the 4th voltage vector second node switch combination also all for A type or
It is all Type B；If the switch combination from first voltage vector to second voltage vector in second node changes to B from A type
Type, it is determined that third voltage vector and the 4th voltage vector are all Type B in the switch combination of second node；If from
Switch combination of one voltage vector to second voltage vector in second node changes to A type from Type B, it is determined that third electricity
Pressure the 4th voltage vector of vector sum is all A type in the switch combination of second node.
As shown from the above technical solution, it is total that the beneficial effects of the present invention are: reduction six-phase motors provided by the invention
The SVPWM control method of mode voltage can be such that common-mode voltage at node is significantly reduced, can be in a PWM cycle
It is symmetrical to realize without increasing harmonic wave.In the inverter effect of identical frequency, the amplitude of common-mode voltage reduces very much；And permitting
Perhaps in the presence of certain common-mode voltage, inverter frequency can be improved to further decrease harmonic wave.
Detailed description of the invention
Fig. 1 is that double Y provided in an embodiment of the present invention move 30 ° of six-phase permanent-magnet synchronous motor coil space distribution maps；
Fig. 2 is that double Y provided in an embodiment of the present invention move 30 ° of six-phase permanent-magnet synchronous motor inverter connection figures；
Fig. 3 is that double Y provided in an embodiment of the present invention move 30 ° of six-phase permanent-magnet synchronous motor voltage vectors in point in the space α β
Butut；
Fig. 4 is that double Y provided in an embodiment of the present invention move 30 ° of six-phase permanent-magnet synchronous motor voltage vectors in the space z1z2
Distribution map；
Fig. 5 is that double Y provided in an embodiment of the present invention move common-mode voltage at 30 ° of six-phase permanent-magnet synchronous motors, two nodes
Situation of change.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
By taking double Y move 30 ° of six-phase permanent-magnet synchronous motors as an example, the invention will be further described.
Double Y move the space structure figure of the stator coil of 30 ° of six-phase permanent-magnet synchronous motors to be determined as shown in Figure 1, possessing two sets
Subcoil, is spatially separated by 30 ° of angles, the winding distribution of stator spatially, and A phase differs 120 ° with B phase and C phase, A phase and D
30 ° of difference, E phase differs 30 ° with B phase, and F phase differs 30 ° with C phase.
As shown in Fig. 2, being the connection figure of inverter and motor, the stator coil of motor has two sets of independent windings,
Two sets of stator winding are there are two independent node, and ABC is first set winding, and node N, DEF are second set of winding, and node is
N'.According to the analysis that double Y are moved with 30 ° of six-phase permanent-magnet synchronous motor harmonic waves, all vectors can be divided into one containing Organic Electricity
Double Y are moved 30 ° of six-phase permanent-magnets and synchronize electricity by the α β first harmonic spatial of energy conversion and (z1z2), the space (o1o2) of only harmonic wave
(o1o2) harmonic wave space is not present in the structural advantage of motivation, and the distribution in the space α β and the space (z1z2) is respectively such as Fig. 3 and Fig. 4 institute
Show.The alternative vector of six-phase motor is 26=64, in this 64 vectors, there are 4 Zero voltage vectors, there are also 60
Effective voltage vector is divided into four groups, wherein having amplitude is 0.644udc12 maximum vectors；Amplitude is 0.471udc12
A middle voltage vector；Amplitude is 0.333udc24 basic voltage vectors and amplitude be 0.1725udc12 minimum voltages arrow
Amount, udcIt is bus bar side voltage.
Define VxyIndicate voltage vector, wherein x represents the switch combination on first node N, and y represents second node
Switch combination on N ', and the value of x and y be 1,2 ..., 6, the switch state of switch combination is indicated with triad number.With
0 and 1 represents the on-off of bridge arm on inverter, and 0 represents disconnection, and 1 represents conducting.Such as V11In first 1 represent first node
Locating bridge arm break-make situation is 001, and it is 001, V that second 1, which represents bridge arm break-make situation at second node,12In 1 represent be
Bridge arm break-make situation is that 001,2 represent is that bridge arm break-make situation is 010 at second node at first node, with such
It pushes away.
The definition of sector: becoming a sector according to the maximum adjacent 12 voltage section that vector surrounds two-by-two, wherein
[π/12-π/12] are the first sector, are the second sector by [π/4 π/12] counterclockwise, and so on.For any one sector,
What is used is all that eight sections of symmetric modes of the four-vector are realized.
Voltage at node situation of change is introduced for convenience, and node voltage defines when switch tube being needed to act on, when being 1
When, bridge arm conducting, node voltage are on inverterWhen for 0, bridge arm is turned off on inverter, and node voltage isWhen
The switch state of Node Switch combination is there are at two 1, and when as 011,101 or 110 act on, node average voltage is?
These three groups are collectively referred to as the combination of A type；When the switch state of Node Switch combination is there are at two 0, as 001,010 or 100 are made
Used time, node average voltage areThese three groups are collectively referred to as Type B combination.
Double Y, which move 30 ° of six-phase motors, has the characteristics that voltage vector redundancy, selects again from numerous voltage vectors suitable
Together in the useful effect vector for reducing common-mode voltage, the method for providing voltage vector selection.The presence of Zero voltage vector is to generate
One of the main reason for common-mode voltage, in the presence of having Zero voltage vector, the voltage change amplitude meeting in voltage at node jump
It is very big, therefore the method used is the opposite equivalent Zero voltage vector of voltage vector collective effect of choice direction；In order not to improve
Harmonic component, while loss is reduced, using eight sections of the four-vector symmetrical vector arrangement methods in a cycle.Wherein select voltage
The principle of vector is: (1) can be realized in a PWM cycle using TMS320f28335 control chip；(2) selected voltage
There are two contrary voltage vectors for synthesizing Zero voltage vector in vector；(3) on-off times are most in a PWM cycle
It is possible few to guarantee that loss is minimum；(4) to select busbar voltage utilization rate higher in the combination of satisfactory voltage vector
Vectorial combination.
The SVPWM control method for reducing common-mode voltage is specifically introduced by taking third sector as an example below, other sectors use phase
Same method, the method for the present embodiment are as described below.
Step 1: selecting four effective voltage vectors, respectively first voltage vector, second voltage in third sector
Vector, third voltage vector and the 4th voltage vector, specific choice method are as follows.
Step 1.1: selecting two adjacent maximum voltage vectors as first voltage of the sector in third sector
Second voltage vector of vector sum.
In the present embodiment, two vectors selected are V64And V66。
Step 1.2: according to electricity at two individual stator nodes when first voltage vector and second voltage vector effect
The situation of change of pressure selects the third voltage vector and the 4th voltage vector of the sector, and the specific method is as follows.
Step 1.2.1: it when first voltage vector and second voltage vector effect, analyzes at first stator node
The situation of change of common-mode voltage amplitude, if common-mode voltage amplitude remains unchanged at first stator node, selection is sent as an envoy to
Several voltage vectors for the voltage vector type that common-mode voltage amplitude still remains unchanged at first stator node, if first
Common-mode voltage amplitude changes at stator node, then sends as an envoy to first and determine according to the common-mode voltage amplitude situation selection after variation
Common-mode voltage amplitude remains several voltage vectors of the voltage vector type of the common-mode voltage amplitude after variation at child node.
Specifically, judging that the switch combination of first voltage vector and second voltage vector at first node is A
Type or Type B.If being all A type or all for Type B, first node in selected third and the 4th voltage vector
Switch combination be also all A type or be all Type B；If saved from first voltage vector to first of second voltage vector
The switch combination of point changes to Type B from A type, it is determined that the switch combination of first node of third and the 4th voltage vector is all
For Type B；If changing to A type from Type B from first voltage vector to the switch combination of first node of second voltage vector,
Then determine that the switch combination of first node of third and the 4th voltage vector is all A type.Third and the 4th in this way
The switch combination of first node of voltage vector is exactly A type (V3y、V5y、V6y) or Type B (V1y、V2y、V4y)。
In the present embodiment, V is found64And V66First node of the two vectors the two voltage vectors act on when be
Two A type combinations, so needing to select first node in third and the 4th voltage vector all to select two A type groups
It closes, that is, has V3y、V5y、V6y, y therein indicates the switch combination on second node.
Step 1.2.2: it when first voltage vector and second voltage vector effect, analyzes at second stator node
The situation of change of common-mode voltage amplitude, if common-mode voltage amplitude remains unchanged at second stator node, selection is sent as an envoy to
Common-mode voltage amplitude still keeps several voltage vectors of constant voltage vector type at second stator node, if second
Common-mode voltage amplitude changes at a stator node, then sends as an envoy to second according to the common-mode voltage amplitude situation selection after variation
Common-mode voltage amplitude remains several voltage vectors of the voltage vector type of the common-mode voltage amplitude after variation at stator node.
Specifically, judging that the switch combination of first voltage vector and second voltage vector at second node is A
Type or Type B.Common-mode voltage is reduced to greatest extent in order to reach, if from first voltage vector to second voltage vector
The combination of second Node Switch all be A type or be all Type B, then select second of third and the 4th voltage vector to save
The switch combination of point is also all A type or is all Type B；If from first voltage vector to second of second voltage vector
The switch combination of node changes to Type B from A type, it is determined that the switch combination of second node of third and the 4th voltage vector
It is all Type B；If changing to A from Type B from first voltage vector to the switch combination of second node of second voltage vector
Type, it is determined that the switch combination of second node of third and the 4th voltage vector is all A type.
In the present embodiment, second knot vector effect combination of third and the 4th voltage vector is selected, is needed
According to selected V64And V66Selection is to change to A type from Type B, so the due to being to change to 6 by 4 on second node
Two nodes select all as A type, so the combination of remaining the third and fourth two voltage vectors is from (V33、V35、V36、V53、
V55、V56、V63、V65、V66) in selection.
Step 1.2.3: it is selected in all qualified voltage vectors selected in step 1.2.1 and step 1.2.2
Contrary, the highest voltage vector combination of busbar voltage utilization rate, which includes as third voltage vector and the 4th
The combination of a voltage vector.
There are 9 kinds of switch combinations according to the upper available third of two steps and the 4th voltage vector, it is former to select satisfaction selection
The then opposite voltage vector of (2) i.e. both direction, the result obtained in this way have 4 kinds.Further according to selection principle (4), from 4 kinds of results
In obtain the maximum vector of busbar voltage utilization rate.In the present embodiment, according to selection principle (2), alternative combination is V33-
V56, V33-V65, V36-V55, V63-V55, according to analysis, these four all meet principle (2).It is flat in harmonic wave according to selection principle (4)
Surface analysis, in order to enable bus utilization rate is maximum while synthesis harmonic wave is 0, the vectorial combination that can be selected is V36And V55.Institute
It is V with final voltage vector sequence of operation64-V66-V36-V55By analysis, DSP can be used in engineering in this combination
On realized.
Step 3: the action time of four voltage vectors is calculated according to voltage-second balance principle, if calculated without ovennodulation
The action time of Zero voltage vector out.
Step 4: the action time of Zero voltage vector being handled as follows, final third voltage vector and is obtained
The action time of four voltage vectors: by the action time for the Zero voltage vector being calculated according to third voltage vector and
The amplitude size inverse proportion of four voltage vectors is divided into two parts, then is added separately to calculating by this two parts action time
To third voltage vector and the 4th voltage vector action time in, obtain final third voltage vector and the 4th
The action time of a voltage vector.
According to four voltage vectors derived above and its action time, using eight sections of symmetrical arrangement modes of the four-vector
Selected four voltage vectors are arranged, and analyze the voltage change situation at two stator nodes.
The final voltage vector sequence of operation and two voltage at node that the present embodiment method obtains jump situation such as Fig. 5
It is shown.It can be seen that voltage is always at node N in a PWM cycleIt remains unchanged, and voltage is only at node N '
Change twice, the amplitude of variation isAnalysis is it is found that there are many common mode voltage reduction at node.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment, or some or all of the technical features are equal
Replacement；And these are modified or replaceed, model defined by the claims in the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (3)
1. a kind of SVPWM control method for reducing six-phase motor common-mode voltage, it is characterised in that: the following steps are included:
Step 1: according to the analysis to salient-pole synchronous motor harmonic wave, all voltage vectors being divided into one and are turned containing electromechanical energy
The space z1z2, o1o2 of the α β first harmonic spatial and only harmonic wave that change；
Step 2: the α β first harmonic spatial with energy converting between mechanical being divided into 12 sectors, selecting four in each sector has
Voltage vector is imitated, specific choice method is as follows:
Step 2.1: two adjacent maximum voltage vectors being selected to swear in each sector as first voltage of the sector
Amount and second voltage vector；
Step 2.2: according to two individual stator voltage at node when first voltage vector and the effect of second voltage vector
Situation of change selects the third voltage vector and the 4th voltage vector of the sector, method particularly includes:
Step 2.2.1: when first voltage vector and second voltage vector effect, common mode at first stator node is analyzed
The situation of change of voltage magnitude, if common-mode voltage amplitude remains unchanged at first stator node, selection sends as an envoy to first
Several voltage vectors for the voltage vector type that common-mode voltage amplitude still remains unchanged at a stator node, if first stator
Common-mode voltage amplitude changes at node, then selects first stator section of sening as an envoy to according to the common-mode voltage amplitude situation after variation
Common-mode voltage amplitude remains several voltage vectors of the voltage vector type of the common-mode voltage amplitude after variation at point；
Step 2.2.2: when first voltage vector and second voltage vector effect, common mode at second stator node is analyzed
The situation of change of voltage magnitude, if common-mode voltage amplitude remains unchanged at second stator node, selection sends as an envoy to second
Common-mode voltage amplitude still keeps several voltage vectors of constant voltage vector type at a stator node, if second fixed
Common-mode voltage amplitude changes at child node, then selects second stator of sening as an envoy to according to the common-mode voltage amplitude situation after variation
Common-mode voltage amplitude remains several voltage vectors of the voltage vector type of the common-mode voltage amplitude after variation at node；
Step 2.2.3: direction is selected in all qualified voltage vectors selected in step 2.2.1 and step 2.2.2
Opposite several voltage vectors combination；Highest one group of busbar voltage utilization rate is selected from several voltage vector combinations again
Voltage vector combination, the combination are the combination for including third voltage vector and the 4th voltage vector；
Step 3: the action time of four voltage vectors is calculated according to voltage-second balance principle, if calculating zero without ovennodulation
The action time of voltage vector；
Step 4: the action time of Zero voltage vector being handled as follows, final third voltage vector and the 4th are obtained
The action time of voltage vector: the action time for the Zero voltage vector that step 3 is calculated according to third voltage vector and
The amplitude size inverse proportion of 4th voltage vector is divided into two parts, and then this two parts action time is added separately in step
In the action time of the 3 third voltage vectors being calculated and the 4th voltage vector.
2. a kind of SVPWM control method for reducing six-phase motor common-mode voltage according to claim 1, feature exist
In: the voltage vector type is divided into A type and Type B, is defined with the following method:
V is defined firstxyIndicate voltage vector, wherein x represents the switch combination on first node, and y is represented on second node
Switch combination, and the numerical value value of x and y is 1,2 ..., 6, and opened with the corresponding triad coded representation node of numerical value
Combined switch state is closed, i.e., respectively represents the on and off of bridge arm on inverter with 1 and 0,0 represents disconnection, and 1 represents conducting:
When Node Switch combination switch state exist at two 1, as 011,101 or 110 effect when, the node average voltage
For udc/ 6, these three groups are collectively referred to as A type；When the switch state of Node Switch combination is there are at two 0, as 001,010 or
When 100 effect, which is -- udc/ 6, these three groups are collectively referred to as Type B, wherein udcFor bus bar side voltage.
3. a kind of SVPWM control method for reducing six-phase motor common-mode voltage according to claim 2, feature exist
In: the step 2.2.1's method particularly includes:
Judge that the switch combination of first voltage vector and second voltage vector at first node is A type or Type B, such as
Fruit is all A type or is all Type B, then the opening in first node in selected third voltage vector and the 4th voltage vector
Combination is closed also all to be A type or be all Type B；If from first voltage vector to second voltage vector in first node
Switch combination changes to Type B from A type, it is determined that the switching group of third voltage vector and the 4th voltage vector in first node
Closing all is Type B；If changed in the switch combination of first node from Type B from first voltage vector to second voltage vector
A type, it is determined that third voltage vector and the 4th voltage vector are all A type in the switch combination of first node；
Step 2.2.2's method particularly includes:
Judge that the switch combination of first voltage vector and second voltage vector at second node is A type or Type B, such as
Fruit is all A type or is all Type B from first voltage vector to switch combination of second voltage vector at second node,
Then select third voltage vector and the 4th voltage vector in the switch combination of second node also all for A type or be all B
Type；If the switch combination from first voltage vector to second voltage vector in second node changes to Type B from A type,
Determine that third voltage vector and the 4th voltage vector in the switch combination of second node are all Type B；If from first
Switch combination of the voltage vector to second voltage vector in second node changes to A type from Type B, it is determined that third voltage arrow
Amount and the 4th voltage vector in the switch combination of second node are all A type.
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| CN107666261B (en) * | 2017-10-27 | 2019-12-10 | 沈阳工业大学 | SVPWM control method for double three-phase motor with low common-mode voltage |
| CN109873593B (en) * | 2017-12-05 | 2021-02-26 | 中车株洲电力机车研究所有限公司 | Six-phase motor space vector modulation method and device and application thereof |
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