CN113078839A - Six-phase seven-bridge-arm series winding circuit topology with reverse connection winding and modulation method thereof - Google Patents

Six-phase seven-bridge-arm series winding circuit topology with reverse connection winding and modulation method thereof Download PDF

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CN113078839A
CN113078839A CN202110306975.7A CN202110306975A CN113078839A CN 113078839 A CN113078839 A CN 113078839A CN 202110306975 A CN202110306975 A CN 202110306975A CN 113078839 A CN113078839 A CN 113078839A
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phase
bridge arm
winding
voltage
windings
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孙翔文
汪志远
李哲锴
孙千宸
黄霁蓝
李安
刘自程
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Huazhong University of Science and Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • 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
    • H02P27/085—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 wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency

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  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses a six-phase seven-bridge-arm series winding circuit topology with a reverse connection winding and a modulation method thereof, belonging to the field of alternating current motors and drive control. The invention improves the voltage utilization rate by changing the series connection sequence of the phase windings of the six-phase motor and connecting part of the windings in a reverse mode. Compared with the connection mode of a six-phase seven-bridge-arm series winding circuit with the phase windings in series and the delta n being 1, the six-phase seven-bridge-arm series winding circuit with the reversely connected windings has high direct-current voltage utilization rate and is the original scheme
Figure DDA0002987923600000011
The method can be applied to application scenes that the direct current bus voltage is limited and the utilization rate of the direct current voltage is high, such as the fields of electric automobiles, ship propulsion systems and the like; compared with a six-phase eight-bridge arm series winding circuit connection mode that the phase windings are connected in series in a serial mode and delta n is 2, the six-phase seven-bridge arm series winding circuit with the windings in the reverse connection mode has the same direct current voltage utilization rate, but the needed bridge arms are few, the power density is higher, and the cost is lower.

Description

Six-phase seven-bridge-arm series winding circuit topology with reverse connection winding and modulation method thereof
Technical Field
The invention belongs to the field of alternating current motors and drive control, and particularly relates to a six-phase seven-bridge-arm series winding circuit topology with a reverse connection winding and a modulation method thereof.
Background
In recent years, as multiphase motors have the advantages of small torque ripple, low power device capacity requirement, strong fault-tolerant capability and the like, the multiphase motors and control technology thereof are increasingly attracting attention of people. In the research of multiphase motor drive, a half-bridge topology is a basic topology structure of a traditional multiphase inverter, but the half-bridge topology has the inherent defects of low stator current control freedom, narrow speed regulation range, poor fault tolerance performance and the like; in addition, an N-phase full-bridge inverter topology structure is provided, which overcomes some disadvantages of a half-bridge topology, but also brings other disadvantages of more power devices, high system cost, low power density, large operation loss and the like.
There is proposed a configuration as shown in fig. 1, in which the number of phases in the inverter is an odd number of 5 or more, and the number of windings is set to be equal to or greater than 5
Figure BDA0002987923580000011
When the interval phases are connected in series, the utilization rate of the direct current voltage of the inverter can reach the maximum value, namely the alternating current phase voltage output by the inverter is the maximum under the same direct current bus voltage. The direct current bus voltage is limited and the utilization rate of the direct current voltage is high when the direct current bus voltage of an electric automobile, a ship propulsion system and the like is limitedThe application is of great significance. However, this document does not describe the case where the number of phases N is equal to an even number.
The six-phase motor is used as an even-phase multi-phase motor which is most widely used, and when a driving inverter is designed by using a winding series connection idea, two winding series connection wiring schemes exist at present. The first is a connection mode in which phase windings are sequentially connected in series, and Δ n is 1, a six-phase seven-arm series winding circuit used in this scheme is shown in fig. 2, and the scheme has a low dc voltage utilization rate of only 0.5. The second is a connection mode with the phase winding in series and delta n equal to 2, and the voltage utilization rate of the scheme is improved compared with that of the former
Figure BDA0002987923580000021
However, two three-phase four-leg inverters are required to be used for driving, and a six-phase eight-leg series winding circuit as shown in fig. 3 is formed by combining the inverters, so that the required number of legs is increased, and the defects of low power density and high device cost are caused.
Therefore, in the prior art, the connection mode of driving the six-phase motor by using the series windings in the serial mode is difficult to realize the optimal matching in the aspects of voltage utilization rate, power density, device cost and the like.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a six-phase seven-bridge-arm series winding circuit topology with reverse connection windings and a modulation method thereof, and aims to improve the utilization rate of direct-current voltage under the condition of not increasing the number of power devices in an inverter system.
To achieve the above object, according to one aspect of the present invention, there is provided a six-phase seven-leg series winding circuit topology with reversed windings, comprising: a six-phase seven-bridge arm inverter and a six-phase open winding motor;
the six-phase winding of the motor is provided with three even-numbered phase windings, the positive ends and the negative ends of the even-numbered phase windings are reversely connected with the other windings in series, and the phase difference between the adjacent windings which are connected in series is 120 degrees;
7 motor winding nodes led out after the windings are connected in series are sequentially connected with 7 bridge arm output nodes.
Further, the six-phase seven-leg inverter includes 7 legs, each leg including: the power switching device of the upper bridge arm and the power switching device of the lower bridge arm; the upper node of the upper bridge arm power switch device in each bridge arm is connected with a direct current bus voltage, the lower node of the lower bridge arm power switch device is connected with a power ground, and the lower node of the upper bridge arm power switch device is connected with the upper node of the lower bridge arm power switch device and serves as an output node of the bridge arm.
Further, the node where the stator winding current flows in is the winding positive terminal, and the node where the stator winding current flows out is the winding negative terminal.
Furthermore, the positive ends and the negative ends of the two-phase winding, the four-phase winding and the six-phase winding are reversed, and on the basis, the six-phase winding of the motor has four connection modes: the first, second, third, fourth, fifth and sixth phase windings are connected in sequence; the first, second, sixth, fourth, fifth and third phase windings are connected in sequence; the first, fifth, third, fourth, second and sixth phase windings are connected in sequence; the first, fifth, sixth, fourth, second and third phase windings are connected in sequence.
According to another aspect of the present invention, there is provided a carrier SPWM voltage modulation method for the six-phase seven-leg series winding circuit topology with reversed windings, comprising:
s1, determining reference voltage vectors V of 7 bridge armsl(k)Taking the value of (A);
s2, using reference voltage vectors V of 7 bridge armsl(k)And a carrier signal VcmMaking a comparison when Vl(k)When the signal is greater than the carrier signal, the upper bridge arm is switched on, and the lower bridge arm is switched off; vl(k)When the current is less than the carrier signal, the lower bridge arm is switched on, the upper bridge arm is switched off, a real-time duty ratio is obtained, and square wave driving signals of each bridge arm power device are generated according to the real-time duty ratio;
and S3, inputting the driving signal into a driving circuit to drive a power switching device to act so as to generate the required motor stator phase voltage.
Further, in step S1, specifically, the 7 bridge arm voltage vectors V are determined according to the following formula according to the 6 phase voltage vectors that need to be outputl(k)Comprises the following steps:
Figure BDA0002987923580000031
vprefand the amplitude of the stator phase voltage required to be output is shown, and omega is the angular frequency of the voltage.
Further, step S1 is to determine the 7 bridge-arm reference voltage vectors V according to the following formula according to the given voltage modulation ratiol(k)The value of (A) is as follows:
Figure BDA0002987923580000032
m is a given voltage modulation ratio, VcmThe amplitude of the triangular carrier signal, and ω is the voltage angular frequency.
In general, the above technical solutions contemplated by the present invention can achieve the following advantageous effects compared to the prior art.
The scheme has the advantages of two existing series connection modes, avoids the defects, and has the characteristics of high direct-current voltage utilization rate, high power density and low cost. In particular, the amount of the solvent to be used,
1) compared with the connection mode of a six-phase seven-bridge-arm series winding circuit with the phase windings in series and the delta n being 1, the six-phase seven-bridge-arm series winding circuit with the reversely connected windings has high direct-current voltage utilization rate and is the original scheme
Figure BDA0002987923580000041
The method can be applied to application scenes that the direct current bus voltage is limited and high direct current voltage utilization rate is needed, such as the fields of electric automobiles, ship propulsion systems and the like.
2) Compared with a six-phase eight-bridge arm series winding circuit connection mode that the phase windings are connected in series in a serial mode and delta n is 2, the six-phase seven-bridge arm series winding circuit with the windings in the reverse connection mode has the same direct current voltage utilization rate, but the needed bridge arms are few, the power density is higher, and the cost is lower.
Drawings
FIG. 1 is a typical topology of a prior art N-phase N +1 bridge arm series winding circuit;
fig. 2 is a six-phase seven-leg series winding circuit topology with phase windings in series and Δ n ═ 1;
fig. 3 is a six-phase eight-leg series winding circuit topology with a phase winding in series and Δ n ═ 2;
FIG. 4 is one of four six-phase seven-leg series winding circuit topologies with reverse windings proposed by the present invention;
FIG. 5 is a schematic of a six-phase motor winding;
FIG. 6 is a voltage vector diagram for a six-phase, seven leg, multi-phase motor;
fig. 7 is a voltage vector diagram of a six-phase seven-leg series winding circuit with phase windings in series and Δ n ═ 1;
fig. 8 is a voltage vector diagram of a six-phase eight-leg series winding circuit with a phase winding in series and Δ n of 2;
FIG. 9 is a voltage vector diagram of a six-phase seven-leg series winding circuit with reverse windings in accordance with the present invention;
fig. 10 shows waveforms of phase voltages and currents output from a six-phase seven-leg series winding circuit in which phase windings are connected in series and Δ n is 1;
fig. 11 shows waveforms of phase voltages and currents output from a six-phase eight-leg series winding circuit in which phase windings are connected in series and Δ n is 2;
fig. 12 shows waveforms of output phase voltages and currents of a six-phase seven-leg series winding circuit with a reverse winding according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The main circuit of the invention is a six-phase seven-bridge arm motor driving topology based on a series winding topology, and as shown in figure 2, the main circuit is a typical topology of the main circuit and an inverterThe dc voltage utilization can be determined by the number of phases of the motor and the connection of the motor phase windings. The invention improves the voltage utilization rate by changing the series connection sequence of the phase windings of the six-phase motor and connecting part of the windings in a reverse mode. On one hand, the invention provides four six-phase motor winding series connection wiring modes with reverse connection windings by means of theoretical analysis, and can remarkably improve the direct-current voltage utilization rate to the sequential scheme under the condition of not increasing the number of power devices in an inverter system
Figure BDA0002987923580000051
Doubling; on the other hand, a carrier SPWM voltage modulation method aiming at the winding series connection wiring mode is provided; the method and the effect provided by the invention are verified through experiments.
Firstly, the invention provides four six-phase seven-bridge arm series winding circuit topological structures with reverse connection windings, which comprise: 7 bridge arms are formed from the bridge arms 1 to the bridge arms 7, and 6 phase windings of the six-phase motor are connected between the bridge arms.
As shown in fig. 5, the winding neutral point of the conventional motor needs to be opened, and nodes at two ends of the six-phase stator winding are led out. For a six-phase motor, for convenience of representation, each phase of the multi-phase motor is represented by Arabic numerals 1-6 from small to large in sequence. As shown in fig. 6, when the stator windings of the motor are symmetrically distributed, the phase difference between the adjacent corresponding electromotive forces is α -2 pi/6, and the reference sign V isP(1)～VP(6)Representing the winding voltage vectors of the phases of a six-phase motor.
Defining the starting point of the voltage vector of each phase winding of the stator, namely a node into which the winding current flows, as a winding positive end; the end point of the voltage vector of each phase winding of the stator, i.e. the node where the winding current flows out, is defined as the winding negative terminal. If the positive end and the negative end of the six-phase winding are sequentially connected end to end, and 7 led-out motor winding nodes and 7 bridge arm output nodes are sequentially connected in sequence, the existing serial connection mode is obtained; if the positive end and the negative end of any phase winding in the six-phase winding are connected in series with the other windings after being reversed, the winding reverse series is realized.
According to the reverse connection mode of the windings, the invention providesFour six-phase motor winding series connection wiring modes with reverse connection windings are respectively
Figure BDA0002987923580000061
Figure BDA0002987923580000062
Or
Figure BDA0002987923580000063
Where the order of the numbers indicates the phase sequence of the phase windings, the numbers with the upper dash indicate the reverse, and "-" indicates the node. The windings are connected in series according to any one of four connection methods, 7 nodes are led out, the 7 led-out motor winding nodes and 7 bridge arm output nodes are sequentially connected in sequence, and the topology structure of the proposed six-phase seven-bridge arm series winding circuit with the reversely connected windings is obtained, as shown in fig. 4
Figure BDA0002987923580000064
And the winding is marked with an 'x' end and is used as a winding negative end.
Wherein, the voltage vector of 7 bridge arms is Vl(k)K ∈ (1,2,. cndot., 7), the phase voltage vector of the 6 windings is Vp(i)I ∈ (1,2,. cndot., 6). And the winding phase voltage is equal to the bridge arm voltage connected at the left node minus the bridge arm voltage V connected at the right nodep(i)＝Vl(k)-Vl(k+1)。
Any of these four connections are used: the number of bridge arms required by the inverter is the same as the connection mode that the phase windings are connected in series and delta n is 1, and the number of the bridge arms is 7; the direct current voltage utilization rate is the same as the connection mode of the phase winding in series and delta n is 2, and the direct current voltage utilization rate is improved to
Figure BDA0002987923580000065
And (4) doubling. The wiring method provided by the invention has the advantages of two serial connection methods and avoids the defects.
The invention further provides a carrier SPWM voltage modulation method for the six-phase seven-leg series winding circuit topology with reverse windings, which is true for any of the series connection methods.
The 6-dimensional phase voltage vector generated by the six-phase seven-bridge arm series winding circuit is required to be Vp(1),Vp(2),···,Vp(6)And the 7-dimensional bridge arm voltage vector is Vl(1),Vl(2),···,Vl(7)。
Because the phase voltage amplitudes of the six-phase stator of the motor are equal, and the phase difference alpha between adjacent corresponding electromotive forces is 2 pi/6, the voltage of the six-phase stator of the motor is set as follows: vp(i)＝vprefsin (ω t- (i-1) α). Wherein v isprefThe amplitude of the stator phase voltage is the voltage angular frequency ω. Similarly, reference output voltage V of 7 bridge armsl(k)Is a group of sinusoidal voltages with equal amplitude and different phases, and the amplitude is set as vlrefThe voltage angular frequency is ω.
When a carrier SPWM strategy is adopted to modulate phase voltage, firstly, a bridge arm voltage vector needs to be determined. Two methods for obtaining the bridge arm voltage vector V are proposedl(k)The method of (1):
the method comprises the following steps: the voltage vector V of 7 bridge arms can be obtained according to the topological structurel(k)And 6 phase voltage vectors Vp(i)The relationship of (1) is: the phase voltage is equal to the bridge arm voltage connected to the left node minus the bridge arm voltage V connected to the right nodep(i)＝Vl(k)-Vl(k+1)，i,k∈(1,2,···,6)。
According to the relation, a voltage vector diagram is made according to the winding series phase sequence proposed by the first aspect as shown in fig. 9, and the amplitude relation between the bridge arm voltage and the phase voltage can be obtained
Figure BDA0002987923580000071
The phase difference between the corresponding electromotive forces of the adjacent bridge arms is 2 pi/3.
Thus, the reference output voltages for the 7 legs were determined to be:
Figure BDA0002987923580000072
the second method comprises the following steps: using carrier wavesWhen the SPWM strategy modulates phase voltage, the reference output voltage vector V of the bridge arml(k)Amplitude of sine-modulated wave signal, triangular carrier signal
Figure BDA0002987923580000073
Defining voltage modulation ratio
Figure BDA0002987923580000074
If the voltage modulation ratio is directly given, the amplitude of the reference voltage of the bridge arms can be determined, so that the reference output voltages of 7 bridge arms are determined as follows:
Figure BDA0002987923580000075
the obtained reference output voltages V of 7 bridge armsl(k)And a carrier signal VcmComparing to obtain real-time duty ratio, generating square wave drive signals of each bridge arm power device according to the real-time duty ratio,
inputting a driving signal into the driving circuit to drive the power switch device to operate when V isl(k)When the signal is greater than the carrier signal, the upper bridge arm is switched on, and the lower bridge arm is switched off; vl(k)When the signal is smaller than the carrier signal, the lower bridge arm is switched on, and the upper bridge arm is switched off;
thereby realizing SPWM voltage modulation of carrier wave and generating required motor stator phase voltage Vp(i)。
The effectiveness of the scheme of the invention is illustrated by analyzing and comparing two connection modes of winding in series and winding in reverse series provided by the invention.
Fig. 2 shows a six-phase seven-leg series winding circuit topology with a serial phase winding and Δ n equal to 1. Obtaining a voltage vector diagram from the winding series phase sequence as shown in FIG. 7, v can be obtainedpref＝vlref(ii) a When the voltage modulation ratio M is equal to 1, the voltage of an output bridge arm is maximum,
Figure BDA0002987923580000081
therefore, the DC voltage utilization rate
Figure BDA0002987923580000082
Fig. 3 shows a six-phase eight-leg series winding circuit topology with a serial phase winding and Δ n equal to 2. Obtaining a voltage vector diagram according to the winding series phase sequence is shown in FIG. 8, and can be obtained
Figure BDA0002987923580000083
Therefore, the DC voltage utilization rate
Figure BDA0002987923580000084
Compared with the structure of FIG. 2, the voltage utilization rate is improved
Figure BDA0002987923580000085
Multiple, but one additional leg.
As shown in FIG. 4, for one of the four topological structures of the six-phase seven-bridge arm series winding circuit with the reversed connection winding, the voltage vector diagram obtained according to the winding series phase sequence is shown in FIG. 9, and the voltage vector diagram can be obtained
Figure BDA0002987923580000086
Therefore, the DC voltage utilization rate
Figure BDA0002987923580000087
Compared with the structure of FIG. 2, the voltage utilization rate is improved
Figure BDA0002987923580000088
Multiple, but the number of legs is unchanged.
The scheme has the advantages of two existing series connection modes and avoids the defects, and has the characteristics of high direct-current voltage utilization rate, high power density and low cost.
To illustrate the method of using the present invention in detail, specific simulation experimental data are exemplified. The required hardware parts include: the six-phase seven-bridge arm inverter, the six-phase open winding motor and the current sensor. The DC bus voltage Udc is supplied to a voltage source type inverter, and the inverter is used for controlling a synchronous motor to perform SPWM control. Open loop control is used in the simulation, and the software part comprises: the bridge arm reference voltage vector generation module and the carrier comparison pulse width modulation module.
Example (b):
taking a six-phase seven-bridge arm motor driving system as an example, experiments are carried out according to the specific implementation steps of the invention. The invention is specifically explained and verified by taking data obtained in the experimental process as an example. The simulation parameter settings are shown in table 1:
TABLE 1
Parameter(s) Numerical value
Number of phases 6
Bus voltage 400V
Voltage modulation ratio 1
Frequency of output voltage 800Hz
Excitation inductance 3.4mH
Stator resistor 1.5Ω
The invention provides four six-phase motor winding strings with reverse connection windingsThe wire connecting mode is as follows:
Figure BDA0002987923580000091
or
Figure BDA0002987923580000092
The windings are connected in series according to any one of the four connection methods, and 7 nodes are led out. And sequentially connecting the led-out 7 motor winding nodes with 7 bridge arm output nodes in sequence to obtain the six-phase seven-bridge arm series winding circuit topology with the reverse connection winding.
And then, according to the modulation method provided by the invention, complementary conduction of power switching devices in 7 bridge arms is controlled to generate six-phase stator voltage required by the motor.
In order to verify the dc voltage utilization, it is necessary to maximize the output stator phase voltage. At the moment, the voltage modulation ratio is 1, and the amplitude v of the reference voltage of the bridge armlrefEqual to the carrier voltage amplitude:
Figure BDA0002987923580000093
thus setting the reference voltage V of 7 armsl(k)Comprises the following steps:
Figure BDA0002987923580000094
outputting reference voltage V of 7 bridge armsl(k)Comparison with a carrier signal, Vl(k)When the signal is greater than the carrier signal, the upper bridge arm is switched on, and the lower bridge arm is switched off; vl(k)When the signal is smaller than the carrier signal, the lower bridge arm is switched on, and the upper bridge arm is switched off; obtaining a driving signal of the power switching device in each bridge arm, inputting the driving signal into a driving circuit, driving the power switching device to act, and generating the required motor stator phase voltage Vp(i). The waveforms of the output phase voltages and currents of the six-phase seven-leg series winding circuit with the reverse connection winding are shown in fig. 12. The phase voltage 344.4V is output, the phase current 21.67A is output, and the voltage utilization rate is 0.861.
According to the invention, the stator phase voltage amplitude vprefReference output voltage amplitude v of sum bridge armlrefRelation, theoretical output phase voltage
Figure BDA0002987923580000101
Theoretical DC voltage utilization rate of
Figure BDA0002987923580000102
Similarly, the output results of the six-phase motor in the two winding series connection modes are tested through simulation.
Fig. 10 shows waveforms of phase voltages and currents output from a six-phase seven-arm series winding circuit in which phase windings are connected in series and Δ n is 1. The phase voltage is output to 199.6V, the phase current is 19.88A, and the voltage utilization rate is 0.499. Theoretical output phase voltage vpref＝vlrefThe theoretical dc voltage utilization is 200: m is 0.5.
Fig. 11 shows waveforms of phase voltages and currents output from a six-phase eight-arm series winding circuit in which phase windings are connected in series and Δ n is 2. The phase voltage 344.5V is output, the phase current 21.69A is output, and the voltage utilization rate is 0.861. Theoretical output phase voltage
Figure BDA0002987923580000103
Theoretical DC voltage utilization rate of
Figure BDA0002987923580000104
The actual values of the amplitude value of the output phase voltage and the voltage utilization rate are basically consistent with the theoretical values, and the deviation is within the error range.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. A six-phase seven-bridge arm series winding circuit topology with a reverse connection winding is characterized by comprising: a six-phase seven-bridge arm inverter and a six-phase open winding motor;
the six-phase winding of the motor is provided with three even-numbered phase windings, the positive ends and the negative ends of the even-numbered phase windings are reversely connected with the other windings in series, and the phase difference between the adjacent windings which are connected in series is 120 degrees;
7 motor winding nodes led out after the windings are connected in series are sequentially connected with 7 bridge arm output nodes.
2. The six-phase seven-leg series winding circuit topology with opposing windings of claim 1, wherein a six-phase seven-leg inverter comprises 7 legs, each leg comprising: the power switching device of the upper bridge arm and the power switching device of the lower bridge arm; the upper node of the upper bridge arm power switch device in each bridge arm is connected with a direct current bus voltage, the lower node of the lower bridge arm power switch device is connected with a power ground, and the lower node of the upper bridge arm power switch device is connected with the upper node of the lower bridge arm power switch device and serves as an output node of the bridge arm.
3. The six-phase seven-leg series winding circuit topology with the reverse connection winding according to claim 1 or 2, wherein a node where the stator winding current flows in is a winding positive terminal, and a node where the stator winding current flows out is a winding negative terminal.
4. The six-phase seven-leg series winding circuit topology with the reverse connection winding as claimed in claim 1, wherein the positive and negative terminals of the two, four and six-phase windings are reversed, and on the basis, the six-phase winding of the motor has four connection modes: the first, second, third, fourth, fifth and sixth phase windings are connected in sequence; the first, second, sixth, fourth, fifth and third phase windings are connected in sequence; the first, fifth, third, fourth, second and sixth phase windings are connected in sequence; the first, fifth, sixth, fourth, second and third phase windings are connected in sequence.
5. A carrier SPWM voltage modulation method for a six-phase seven-leg series winding circuit topology with opposing windings of claims 1-4, comprising:
s1, determining reference voltage vectors V of 7 bridge armsl(k)Taking the value of (A);
s2, using reference voltage vectors V of 7 bridge armsl(k)And a carrier signal VcmMaking a comparison when Vl(k)When the signal is greater than the carrier signal, the upper bridge arm is switched on, and the lower bridge arm is switched off; vl(k)When the current is less than the carrier signal, the lower bridge arm is switched on, the upper bridge arm is switched off, a real-time duty ratio is obtained, and square wave driving signals of each bridge arm power device are generated according to the real-time duty ratio;
and S3, inputting the driving signal into a driving circuit to drive a power switching device to act so as to generate the required motor stator phase voltage.
6. The carrier SPWM voltage modulation method of claim 5 wherein step S1 is specifically implemented by determining 7 bridge arm voltage vectors V according to the following formula according to 6 phase voltage vectors required to be outputl(k)Comprises the following steps:
Figure FDA0002987923570000021
vprefand the amplitude of the stator phase voltage required to be output is shown, and omega is the angular frequency of the voltage.
7. The carrier SPWM voltage modulation method of claim 5 wherein step S1 is embodied as determining 7 bridge arm reference voltage vectors V according to the following formula according to a given voltage modulation ratiol(k)The value of (A) is as follows:
Figure FDA0002987923570000022
m is a given voltage modulation ratio, VcmThe amplitude of the triangular carrier signal, and ω is the voltage angular frequency.
CN202110306975.7A 2021-03-23 2021-03-23 Six-phase seven-bridge-arm series winding circuit topology with reverse connection winding and modulation method thereof Pending CN113078839A (en)

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