CN103516175A - Method for judging three-phase voltage vector spatial position - Google Patents

Abstract

The invention discloses a method for judging 12 sectors of a three-phase voltage vector spatial position. The method comprises the steps that the three-phase voltage vector spatial position is divided into six large sectors; specifically, coordinate transformation is conducted on three-phase voltage spatial vectors ua, ub and uc so that voltage vectors u alpha and u beta under a two-phase stationary coordinate system can be obtained; according to the voltage vectors u alpha and u beta, the large sector where a spatial voltage vector Uout is located is determined; according to the voltage vectors u alpha and u beta, the time T1 and the time T2 by which non-zero basic spatial voltage vectors act in the large vector are determined; according to the relation between the size of the action time T1 and the action time T2 and the large sector where the three-phase spatial voltage vector Uout is located, each large sector is divided into two small sectors and then the small sector where the three-phase voltage spatial vector Uout is located is determined. According to simple calculation, the size of action time of two adjacent basic spatial voltage vectors in one large sector is judged, and according to the relation between the size of the action time, the spatial position of three-phase voltage vectors can be quickly judged.

Description

A kind of three-phase voltage vector space positions determination methods

Technical field

The present invention relates to a kind of determination methods of voltage vector, more particularly, relate to a kind of three-phase voltage vector space positions determination methods.

Background technology

The determination methods of traditional three-phase voltage vector 12 sectors is by the three-phase voltage signal u detecting _a, u _b, u _ccarry out 3/2 coordinate transform, obtain the voltage signal u under two-phase static coordinate _α, u _β, then utilize arctan function to obtain voltage angle θ, with this, determine ，Ji sector, the locus θ of three-phase voltage vector _n.Concrete steps are referring to Fig. 1:

First by three-phase voltage signal u _a, u _b, u _ccarry out 3/2 coordinate transform and obtain the voltage signal u under two-phase static coordinate _α, u _β, transformation for mula is as follows:

$\left[\begin{array}{c}{u}_{\mathrm{\α}}\\ u_{\mathrm{\β}}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{u}_a\\ u_b\\ u_c\end{array}\right].$

Then according to u _α, u _βobtain voltage angle θ, wherein: θ=arctan (u _β/ u _α);

Finally, according to voltage angle θ, determine the locus of three-phase voltage vector.As shown in Figure 2, space vector of voltage is divided into 12Ge sector, according to voltage angle θ, determines the locus of three-phase voltage vector.For example,, as θ=arctan (u _βu _αduring)=50 °, account for voltage space vector is at θ ₃in sector.Sector θ _nby following formula, determined:

(n-2) π/6≤θ _n≤ (n-1) π/6; Wherein: n=1,2 ..., 12; N is sector number.

By said process, can be found out, the judgement of traditional three-phase voltage vector 12 sectors must be by coordinate transform and arctan function computing, and amount of calculation is large, and algorithm is numerous and diverse.Therefore, will inevitably affect response speed and the control precision of system.

Summary of the invention

In view of this, the invention provides a kind of three-phase voltage vector space positions determination methods, in simple calculating judgement Yi Ge great sector, size action time in adjacent two fundamental space voltage vector great sectors, according to the magnitude relationship of action time, can judge fast the locus of three-phase voltage vector.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of three-phase voltage vector space positions determination methods, comprising:

Three-phase voltage vector space is divided into Liu Ge great sector;

By three-phase voltage space vector u _a, u _b, u _ccarry out coordinate transform, obtain the voltage vector u under two-phase rest frame _α, u _β;

According to voltage vector u _αand u _βdetermine three-phase voltage space vector U _outgreat sector, place;

According to voltage vector u _αand u _βdetermine T action time in non-zero fundamental space voltage vector great sector ₁and T ₂;

According to T action time ₁and T ₂magnitude relationship and three-phase voltage space vector U _outgreat sector, place, is divided into Liang Ge little sector by each large sector, then determines three-phase voltage space vector U _outlittle sector, place.

Preferably, described by three-phase voltage space vector u _a, u _b, u _ccarry out coordinate transform, obtain the voltage vector u under two-phase rest frame _α, u _βbe specially:

By three-phase voltage space vector u _a, u _b, u _ccarry out 3/2 coordinate transform, obtain the voltage vector u under two-phase static coordinate _α, u _β, transformation for mula is as follows:

$\left[\begin{array}{c}{u}_{\mathrm{\α}}\\ u_{\mathrm{\β}}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{u}_a\\ u_b\\ u_c\end{array}\right].$

Preferably, according to voltage vector u _αand u _βdetermine three-phase voltage space vector U _outgreat sector, place is specially:

If u _β>0, make A=1, otherwise A=0;

If

, make B=1, otherwise B=0;

If

, make C=1, otherwise C=0;

Three-phase voltage space vector U _outgreat sector, place N is: N=A+2B+4C.

Preferably, described according to voltage vector u _αand u _βdetermine T action time in fundamental space voltage vector great sector ₁and T ₂be specially:

Order $X=\sqrt{3}\frac{T_s}{V_{\mathrm{dc}}}{u}_{\mathrm{\β}},Y=\frac{T_s}{V_{\mathrm{dc}}}(\frac{\sqrt{3}}{2}{u}_{\mathrm{\β}}+\frac{3}{2}{u}_a),Z=\frac{T_s}{V_{\mathrm{dc}}}(\frac{\sqrt{3}}{2}{u}_{\mathrm{\β}}-\frac{3}{2}{u}_a);$

Wherein: V _dcfor DC bus-bar voltage, T _sfor switch periods;

When N=I, T ₁=Z, T ₂=Y, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=II, T ₁=Y, T ₂=-X, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=III, T ₁=-Z, T ₂=X, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=IV, T ₁=-X, T ₂=Z, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=V, T ₁=X, T ₂=-Y, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=VI, T ₁=-Y, T ₂=-Z, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂).

Preferably, described according to T action time ₁and T ₂magnitude relationship and three-phase voltage space vector U _outgreat sector, place, determines three-phase voltage space vector U _outlittle sector, place is specially:

Work as N=I, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 2;

Work as N=I, and T<sub TranNum="257">1</sub><T<sub TranNum="258">2</sub>time, three-phase voltage space vector U<sub TranNum="259">out</sub>the little sector number at place is 3;

When N=II, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 4;

When N=II, and T<sub TranNum="265">1</sub><T<sub TranNum="266">2</sub>time, three-phase voltage space vector U<sub TranNum="267">out</sub>the little sector number at place is 5;

When N=III, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 6;

When N=III, and T<sub TranNum="273">1</sub><T<sub TranNum="274">2</sub>time, three-phase voltage space vector U<sub TranNum="275">out</sub>the little sector number at place is 7;

When N=IV, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 8;

When N=IV, and T<sub TranNum="281">1</sub><T<sub TranNum="282">2</sub>time, three-phase voltage space vector U<sub TranNum="283">out</sub>the little sector number at place is 9;

When N=V, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 10;

When N=V, and T<sub TranNum="289">1</sub><T<sub TranNum="290">2</sub>time, three-phase voltage space vector U<sub TranNum="291">out</sub>the little sector number at place is 11;

When N=VI, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 12;

When N=VI, and T<sub TranNum="297">1</sub><T<sub TranNum="298">2</sub>time, three-phase voltage space vector U<sub TranNum="299">out</sub>the little sector number at place is 1.

From above-mentioned technical scheme, can find out, a kind of three-phase voltage vector space positions determination methods disclosed by the invention, first three-phase voltage vector space is divided into Liu Ge great sector, secondly by three-phase voltage space vector is carried out to coordinate transform, obtain the voltage vector under two-phase rest frame, by voltage vector u _αand u _βdetermine three-phase voltage space vector U _outgreat sector, place, secondly determine fundamental voltage space vector under two-phase rest frame action time in the large sector of determining, last according to the magnitude relationship of action time, each large sector is divided into Liang Ge little sector, thereby determines little sector, three-phase voltage space vector place.Said method is without the arctan function computing by complicated, only need to calculate by simple, in judgement Yi Ge great sector, size action time of adjacent two fundamental voltage space vectors, according to the magnitude relationship of action time, just can judge fast the locus of three-phase voltage vector.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the method flow diagram of the judgement of three-phase voltage vector space positions 12 sectors in prior art;

Fig. 2 is the schematic diagram that three-phase voltage vector is divided into 12Ge sector;

Fig. 3 is three-phase voltage three dimensional vector diagram disclosed by the invention;

Fig. 4 is that voltage space vector disclosed by the invention is at the composition and decomposition schematic diagram of the large sector of I;

Fig. 5 is the flow chart of the disclosed a kind of three-phase voltage vector space positions determination methods of the embodiment of the present invention;

Fig. 6 is the disclosed three-phase voltage space vector of embodiment of the present invention position judgment MATLAB simulation model;

Fig. 7 is the disclosed three-phase voltage space vector of embodiment of the present invention position simulation result oscillogram.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

The embodiment of the invention discloses a kind of three-phase voltage vector space positions determination methods, in simple calculating judgement Yi Ge great sector, size action time of adjacent two fundamental space voltage vectors, according to the magnitude relationship of action time, can judge fast the locus of three-phase voltage vector.

The theory the present invention is based on is, when inventor furthers investigate in vector control technology field, chance in some specific large sectors, exist the action time of adjacent two fundamental voltage space vectors in Yi half-interval one of them action time larger than another action time, in second half is interval this action time the phenomenon less than another action time.

Below for example to based on theory prove:

In Fig. 3, U ₀, U ₁, U ₂, U ₃, U ₄, U ₅, U ₆, U ₇be respectively fundamental space voltage vector.

As shown in Figure 3 and Figure 4, suppose that wish judgement wants synthetic voltage vector U _outin the 1st Zhong position, large sector, fundamental space voltage vector U for wish ₄with fundamental space voltage vector U ₆synthetic, with mean value equivalence, can obtain: U _out* T _s=U ₄* T ₄+ U ₆* T ₆; Wherein: T _sfor switch periods, T ₄for fundamental space voltage vector U ₄action time in first sector, T ₆for fundamental space voltage vector U ₆action time in first sector.

In the static reference frame of two-phase (α, β), make U _outand U ₄between angle be θ, by sine, can be obtained:

Because | U ₄|=| U ₆|=2/3V _dcso the state retention time that can obtain each vector is:

$\begin{array}{c}{\mathrm{<figure-callout\; id="4"\; label="T"\; filenames="HDA0000386370050000021.png,HDA0000386370050000032.png"\; state="\{\{state\}\}">T</figure-callout>}}_4=m{T}_s\sin (\frac{\mathrm{\&pi;}}{3}-\mathrm{\&theta;})\\ {\mathrm{<figure-callout\; id="6"\; label="T"\; filenames="HDA0000386370050000021.png"\; state="\{\{state\}\}">T</figure-callout>}}_6=m{T}_s\sin \mathrm{\&theta;}\end{array}---\left(2\right)$

In formula, m is the SVPWM index of modulation (modulation ratio),

wherein: V _dcfor DC bus-bar voltage.

In formula (2), in specific certain sector, the span of θ is that 0 degree is to 60 degree.

Due to, when 0 degree to 60 is spent, sin function is increasing function, therefore, when<img TranNum="358" file="BDA0000386370040000072.GIF" he="116" img-content="drawing" img-format="GIF" inline="yes" orientation="portrait" wi="210"/>time,<img TranNum="359" file="BDA0000386370040000073.GIF" he="121" img-content="drawing" img-format="GIF" inline="yes" orientation="portrait" wi="206"/>time,<maths TranNum="360" num="0005"><![CDATA[<math> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mfrac> <mi>&pi;</mi> <mn>3</mn> </mfrac> <mo>-</mo> <mi>&theta;</mi> <mo>)</mo> </mrow> <mo>></mo> <mi>sin</mi> <mi>&theta;</mi> </mrow></math>]]></maths>, can draw thus, when<img TranNum="361" file="BDA0000386370040000075.GIF" he="120" img-content="drawing" img-format="GIF" inline="yes" orientation="portrait" wi="204"/>time, T<sub TranNum="362">4</sub>>T<sub TranNum="363">6</sub>.In like manner, when<img TranNum="364" file="BDA0000386370040000076.GIF" he="123" img-content="drawing" img-format="GIF" inline="yes" orientation="portrait" wi="224"/>time,<img TranNum="365" file="BDA0000386370040000077.GIF" he="125" img-content="drawing" img-format="GIF" inline="yes" orientation="portrait" wi="204"/>time,<maths TranNum="366" num="0006"><![CDATA[<math> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mfrac> <mi>&pi;</mi> <mn>3</mn> </mfrac> <mo>-</mo> <mi>&theta;</mi> <mo>)</mo> </mrow> <mo><</mo> <mi>sin</mi> <mi>&theta;</mi> <mo>,</mo> </mrow></math>]]></maths>Can draw thus, when<img TranNum="367" file="BDA0000386370040000079.GIF" he="124" img-content="drawing" img-format="GIF" inline="yes" orientation="portrait" wi="218"/>time, T<sub TranNum="368">4</sub><T<sub TranNum="369">6</sub>.

As shown in Figure 5, for the embodiment of the present invention is based on the disclosed a kind of three-phase voltage vector space positions determination methods of above-mentioned theory, comprising:

S101, three-phase voltage vector space is divided into Liu Ge great sector;

S102, by three-phase voltage space vector u _a, u _b, u _ccarry out coordinate system transformation, obtain the voltage vector u under two-phase static coordinate _α, u _β;

Concrete, by three-phase voltage space vector u _a, u _b, u _ccarry out 3/2 coordinate transform, obtain the voltage vector u under two-phase static coordinate _α, u _β, transformation for mula is as follows:

$\left[\begin{array}{c}{u}_{\mathrm{\&alpha;}}\\ u_{\mathrm{\&beta;}}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{u}_a\\ u_b\\ u_c\end{array}\right].$

S103, by voltage vector u _αand u _βdetermine three-phase voltage space vector U _outgreat sector, place;

Concrete, if u _β>0, make A=1, otherwise A=0;

If

, make B=1, otherwise B=0;

If

, make C=1, otherwise C=0;

Three-phase voltage space vector U _outgreat sector, place N is: N=A+2B+4C.

S104, according to voltage vector u _αand u _βdetermine T action time in non-zero fundamental space voltage vector great sector ₁and T ₂;

Concrete, order $X=\sqrt{3}\frac{T_s}{V_{\mathrm{dc}}}{u}_{\mathrm{\&beta;}},Y=\frac{T_s}{V_{\mathrm{dc}}}(\frac{\sqrt{3}}{2}{u}_{\mathrm{\&beta;}}+\frac{3}{2}{u}_a),$

$Z\frac{T_s}{V_{\mathrm{dc}}}(\frac{\sqrt{3}}{2}{u}_{\mathrm{\&beta;}}-\frac{3}{2}{u}_a);$

V wherein _dcfor DC bus-bar voltage, T _sfor switch periods;

When N=I, T ₁=Z, T ₂=Y, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=II, T ₁=Y, T ₂=-X, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=III, T ₁=-Z, T ₂=X, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=IV, T ₁=-X, T ₂=Z, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=V, T ₁=X, T ₂=-Y, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=VI, T ₁=-Y, T ₂=-Z, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂).

_s105, according to T action time ₁and T ₂magnitude relationship and three-phase voltage space vector U _outgreat sector, place, is divided into Liang Ge little sector by each large sector, then determines three-phase voltage space vector U _outlittle sector, place.

Concrete:

Work as N=I, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 2;

Work as N=I, and T<sub TranNum="518">1</sub><T<sub TranNum="519">2</sub>time, three-phase voltage space vector U<sub TranNum="520">out</sub>the little sector number at place is 3;

When N=II, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 4;

When N=II, and T<sub TranNum="526">1</sub><T<sub TranNum="527">2</sub>time, three-phase voltage space vector U<sub TranNum="528">out</sub>the little sector number at place is 5;

When N=III, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 6;

When N=III, and T<sub TranNum="534">1</sub><T<sub TranNum="535">2</sub>time, three-phase voltage space vector U<sub TranNum="536">out</sub>the little sector number at place is 7;

When N=IV, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 8;

When N=IV, and T<sub TranNum="542">1</sub><T<sub TranNum="543">2</sub>time, three-phase voltage space vector U<sub TranNum="544">out</sub>the little sector number at place is 9;

When N=V, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 10;

When N=V, and T<sub TranNum="550">1</sub><T<sub TranNum="551">2</sub>time, three-phase voltage space vector U<sub TranNum="552">out</sub>the little sector number at place is 11;

When N=VI, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 12;

When N=VI, and T<sub TranNum="558">1</sub><T<sub TranNum="559">2</sub>time, three-phase voltage space vector U<sub TranNum="560">out</sub>the little sector number at place is 1.

As shown in Figure 7, for the present invention is according to the oscillogram of the judgement MATLAB simulation model emulation of three-phase voltage space vector position as shown in Figure 6, from simulation result, can find out that three-phase voltage vector space positions determination methods provided by the invention is consistent with actual judged result, verify the feasibility of three-phase voltage vector space positions determination methods provided by the invention.

From foregoing, the present invention is according in a specific large sector, just there is a large little phenomenon in the interval of half action time of fundamental space voltage vector, according to this phenomenon, 6 Ge great sectors are extended to Liao12Ge little sector, in judgement Yi Ge great sector, size action time of adjacent two fundamental space voltage vectors, judge fast Zhong locus, three-phase voltage vector 12 sector, avoid arctangent cp cp operation complicated in traditional determination methods, improved response speed and the control precision of control system.

In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.

Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (5)

1. a three-phase voltage vector space positions determination methods, is characterized in that, comprising:

Three-phase voltage vector space is divided into Liu Ge great sector;

By three-phase voltage space vector u _a, u _b, u _ccarry out coordinate transform, obtain the voltage vector u under two-phase rest frame _α, u _β;

According to voltage vector u _αand u _βdetermine three-phase voltage space vector U _outgreat sector, place;

According to voltage vector u _αand u _βdetermine T action time in non-zero fundamental space voltage vector great sector ₁and T ₂;

According to T action time ₁and T ₂magnitude relationship and three-phase voltage space vector U _outgreat sector, place, is divided into Liang Ge little sector by each large sector, then determines three-phase voltage space vector U _outlittle sector, place.

2. method according to claim 1, is characterized in that, described by three-phase voltage space vector u _a, u _b, u _ccarry out coordinate transform, obtain the voltage vector u under two-phase rest frame _α, u _βbe specially:

By three-phase voltage space vector u _a, u _b, u _ccarry out 3/2 coordinate transform, obtain the voltage vector u under two-phase static coordinate _α, u _β, transformation for mula is as follows:

$\left[\begin{array}{c}{u}_{\mathrm{\&alpha;}}\\ u_{\mathrm{\&beta;}}\end{array}\right]=\sqrt{\frac{2}{3}}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}{u}_a\\ u_b\\ u_c\end{array}\right].$

3. method according to claim 2, is characterized in that, according to voltage vector u _αand u _βdetermine three-phase voltage space vector U _outgreat sector, place is specially:

If u _β>0, make A=1, otherwise A=0;

If

, make B=1, otherwise B=0;

If

, make C=1, otherwise C=0;

Three-phase voltage space vector U _outgreat sector, place N is: N=A+2B+4C.

4. method according to claim 3, is characterized in that, described according to voltage vector u _αand u _βdetermine T action time in fundamental space voltage vector great sector ₁and T ₂be specially:

Order $X=\sqrt{3}\frac{T_s}{V_{\mathrm{dc}}}{u}_{\mathrm{\&beta;}},Y=\frac{T_s}{V_{\mathrm{dc}}}(\frac{\sqrt{3}}{2}{u}_{\mathrm{\&beta;}}+\frac{3}{2}{u}_a),Z=\frac{T_s}{V_{\mathrm{dc}}}(\frac{\sqrt{3}}{2}{u}_{\mathrm{\&beta;}}-\frac{3}{2}{u}_a);$

Wherein: V _dcfor DC bus-bar voltage, T _sfor switch periods;

When N=I, T ₁=Z, T ₂=Y, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=II, T ₁=Y, T ₂=-X, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=III, T ₁=-Z, T ₂=X, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=IV, T ₁=-X, T ₂=Z, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=V, T ₁=X, T ₂=-Y, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂);

When N=VI, T ₁=-Y, T ₂=-Z, if T ₁+ T ₂>T _s, T ₁=T ₁t _s/ (T ₁+ T ₂), T ₂=T ₂t _s/ (T ₁+ T ₂).

5. method according to claim 4, is characterized in that, described according to T action time ₁and T ₂magnitude relationship and three-phase voltage space vector U _outgreat sector, place, determines three-phase voltage space vector U _outlittle sector, place is specially:

Work as N=I, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 2;

Work as N=I, and T<sub TranNum="735">1</sub><T<sub TranNum="736">2</sub>time, three-phase voltage space vector U<sub TranNum="737">out</sub>the little sector number at place is 3;

When N=II, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 4;

When N=II, and T<sub TranNum="743">1</sub><T<sub TranNum="744">2</sub>time, three-phase voltage space vector U<sub TranNum="745">out</sub>the little sector number at place is 5;

When N=III, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 6;

When N=III, and T<sub TranNum="751">1</sub><T<sub TranNum="752">2</sub>time, three-phase voltage space vector U<sub TranNum="753">out</sub>the little sector number at place is 7;

When N=IV, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 8;

When N=IV, and T<sub TranNum="759">1</sub><T<sub TranNum="760">2</sub>time, three-phase voltage space vector U<sub TranNum="761">out</sub>the little sector number at place is 9;

When N=V, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 10;

When N=V, and T<sub TranNum="767">1</sub><T<sub TranNum="768">2</sub>time, three-phase voltage space vector U<sub TranNum="769">out</sub>the little sector number at place is 11;

When N=VI, and T ₁>T ₂time, three-phase voltage space vector U _outthe little sector number at place is 12;

When N=VI, and T<sub TranNum="775">1</sub><T<sub TranNum="776">2</sub>time, three-phase voltage space vector U<sub TranNum="777">out</sub>the little sector number at place is 1.

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