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SVPWM optimization method

An optimization method, a three-phase voltage technology, applied in design optimization/simulation, motor generator control, control of electromechanical transmissions, etc., can solve the problem of not considering the influence of switching loss, etc. Influence and improve the effect of response efficiency

Pending Publication Date: 2021-03-19
广州理工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above invention patent, although the calculation of the trigonometric function is reduced in the calculation of the action time between the sector where the voltage is located and the basic voltage space vector, and the burden on the CPU is reduced, it does not consider the influence of the switching current factor on the switching loss. Therefore, there is still room for further optimization

Method used

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Experimental program
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Embodiment 1

[0068] Such as figure 1 , figure 2 as well as image 3 Shown, a kind of optimization method of SVPWM comprises the following steps:

[0069] Step 1. Divide the three-phase voltage vector space into six sectors, and input the three-phase voltage space vector, sampling time Ts, and DC bus voltage Ud;

[0070] Step 2: Perform Clark changes on the three-phase voltages to obtain the voltage vectors Ua and Ub in the two-phase static coordinates;

[0071] Step 3, judge the position N of the large sector where the three-phase voltage space vector Uref is located according to the voltage vectors Ua and Ub;

[0072] Step 4, judging the action time Tx and Ty of the basic space voltage in the sector N according to the voltage vectors Ua and Ub;

[0073] Step 5, according to the action time Tx and Ty and the position N of the large sector where the three-phase voltage space vector Uref is located, divide each large sector into two small sectors, and determine the small sector where th...

Embodiment 2

[0083] On the basis of Embodiment 1, in step 3, the specific method for determining the sector position N of the three-phase voltage space vector Uref according to the voltage vectors Ua and Ub is:

[0084] If Ub>0, then let A=1, otherwise A=0;

[0085] like Then let B=1, otherwise B=0;

[0086] like Then let C=1, otherwise C=0;

[0087] Then the sector position N of the three-phase voltage space vector Uref is: N=A+2B+4C.

[0088] Optionally, in step 4, the specific method for determining the action time Tx and Ty of the basic space voltage in the sector N according to the voltage vector is:

[0089] make

[0090] When N=I, Tx=Z, Ty=Y, if Tx+Ty>Ts, then Tx=Tx*Ts / (Tx+Ty), Ty=Ty*Ts / (Tx+Ty);

[0091] When N=II, Tx=Y, Ty=-X, if Tx+Ty>Ts, then Tx=Tx*Ts / (Tx+Ty), Ty=Ty*Ts / (Tx+Ty);

[0092] When N=Ⅲ, Tx=-Z, Ty=-X, if Tx+Ty>Ts, then Tx=Tx*Ts / (Tx+Ty), Ty=Ty*Ts / (Tx+Ty);

[0093] When N=IV, Tx=-X, Ty=Z, if Tx+Ty>Ts, then Tx=Tx*Ts / (Tx+Ty), Ty=Ty*Ts / (Tx+Ty);

[0094] When N=Ⅴ,...

Embodiment 3

[0111] This embodiment is basically the same as Embodiment 2, the difference is:

[0112] In step 6, cross zero vectors are allocated to 12 small sectors, small sectors 1, 4, 5, 8, 9, and 12 use 111 zero vectors, and small sectors 2, 3, 6, 7, 10, and 11 Sectors use 000 zero vectors. Optionally, the switching states of the five control periods of the No. 1 small sector are 001, 010, 111, 010, and 001 in turn, and the vectors of the five control periods are

[0113] The switching states of the five control periods of the No. 2 small sector are 010, 011, 000, 011, and 010 in turn, and the vectors of the five control periods are

[0114] The switching states of the five control periods of small sector 3 are 011, 100, 000, 100, 011 in turn, and the vectors of the five control periods are

[0115] The switch states of the five control periods of the No. 4 small sector are 100, 101, 111, 101, 100 in turn, and the vectors of the five control periods are

[0116] The switchi...

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Abstract

The invention provides an SVPWM optimization method. The SVPWM optimization method comprises the following steps of 1, inputting a three-phase voltage space vector, sampling time Ts and direct-currentvoltage Ud; 2, carrying out Clark change on the three-phase voltage to obtain two-phase voltage vectors Ua and Ub; 3, judging the position N of a large sector where the three-phase voltage space vector Uref is located; 4, judging the action time Tx and Ty of the basic space voltage in the sector N; 5, equally dividing each large sector into two small sectors, and judging the small sector where the three-phase voltage space vector Uref is located; 6, performing cross zero vector distribution to enable each phase to have a symmetrical 60-degree switch non-action area; and 7, adjusting a voltagespace vector switching point of each small sector to enable a switch inaction area to coincide with a switch current maximum area, and generating an SVPWM modulation waveform. According to the invention, the influence of switching current on switching loss can be reduced while the switching frequency is reduced, so that the switching loss of the inverter is further reduced.

Description

technical field [0001] The invention relates to the technical field of inverter modulation control, in particular to an optimization method of SVPWM. Background technique [0002] Pulse width modulation (PWM, pulse width modulation) is an important part of the motor control system. Space vector pulse width modulation (SVPWM, space vector PWM) technology is widely cited in motor vector control due to its characteristics of high voltage utilization, low voltage harmonics and easy digital implementation. [0003] The three-phase bridge voltage inverter is specifically composed of three half-bridges composed of six switching devices, and these six switching devices are combined to have eight safe switching states. If in the voltage space vector, "1" is used to indicate that the upper bridge arm is turned on, and the lower bridge arm is turned off, "0" is used to indicate that the upper bridge arm is turned off, and the lower bridge arm is turned on, among which 000, 111 (here a...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P27/08G06F30/20G06F17/12
CPCH02P21/00H02P27/08G06F30/20G06F17/12Y02B70/10
Inventor 吴华深汪理
Owner 广州理工学院