Generalized threelevel SVPWM modulation algorithm
Generalized threelevel SVPWM modulation algorithm
 CN 106,712,564 A
 Filed: 01/04/2017
 Published: 05/24/2017
 Est. Priority Date: 01/04/2017
 Status: Active Grant
First Claim
1. the level SVPWM modulation algorithm of a kind of broad sense three, it is characterised in that comprise the following steps：
 Step 1, three phasor diagrams of ThreeLevel Inverter System are divided into 6 big sectors by 60 °
of intervals, each big sector is oneIndividual equilateral triangle, 2 small triangles are divided into by equilateral triangle by 30 °
of directions, and each small triangle pair answers a small sector；
Step 2, for arbitrarily small sector, with a big vector V of corresponding small sector_{3}, a middle vector V_{2}And a small vectorV_{1}Remove synthesized reference vector V_{ref}, calculate small vector V_{1}, middle vector V_{2}, big vector V_{3}Action time t_{a}、
t_{b}、
t_{c}, then have：
In formula, K is to be adjusted to depth,E is whole BUS voltages, T_{s}It is ginsengExamine vector V_{ref}Action time, T_{s}=t_{a}+t_{b}+t_{c}, θ
is the angle of reference vector；
Step 3, the big vector V to each big sector_{3}, middle vector V_{2}And small vector V_{1}Sequence of operation be ranked up, according to majorAction time that the sequence of operation and step 2 of each vector in sector are obtained decomposes and obtains accounting for for each pipe in ThreeLevel Inverter SystemSky ratio.
Chinese PRB Reexamination
Abstract
The invention relates to a generalized threelevel SVPWM modulation algorithm which is characterized by comprising the following steps: 1) judging a big sector and a small sector in which a reference voltage vector is located; 2) selecting the acting time of vector calculation and resultant vector; and 3) arranging a vector sequence and calculating a duty ratio. The algorithm provided by the invention is mainly used for solving the problem of serious common mode when a modulation ratio of a highpressure system is small, the common mode voltage of the system is reduced, and smaller THDI can be guaranteed. According to the algorithm provided by the invention, the judgment for the small sector is simplified as two small sectors, procedure codes are optimized, and the vector calculation process is simpler. After the algorithm provided by the invention is adopted, the common mode within a fullvoltage modulation degree scope can be improved, the EMI can be effectively reduced, and the smaller THDI can be guaranteed.

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4 Claims

1. the level SVPWM modulation algorithm of a kind of broad sense three, it is characterised in that comprise the following steps：

Step 1, three phasor diagrams of ThreeLevel Inverter System are divided into 6 big sectors by 60 °
of intervals, each big sector is oneIndividual equilateral triangle, 2 small triangles are divided into by equilateral triangle by 30 °
of directions, and each small triangle pair answers a small sector；Step 2, for arbitrarily small sector, with a big vector V of corresponding small sector_{3}, a middle vector V_{2}And a small vectorV_{1}Remove synthesized reference vector V_{ref}, calculate small vector V_{1}, middle vector V_{2}, big vector V_{3}Action time t_{a}、
t_{b}、
t_{c}, then have：In formula, K is to be adjusted to depth,E is whole BUS voltages, T_{s}It is ginsengExamine vector V_{ref}Action time, T_{s}=t_{a}+t_{b}+t_{c}, θ
is the angle of reference vector；Step 3, the big vector V to each big sector_{3}, middle vector V_{2}And small vector V_{1}Sequence of operation be ranked up, according to majorAction time that the sequence of operation and step 2 of each vector in sector are obtained decomposes and obtains accounting for for each pipe in ThreeLevel Inverter SystemSky ratio.


2. the level SVPWM modulation algorithm of a kind of broad sense three as claimed in claim 1, it is characterised in that in the step 3,First the sequence of operation to the 1st each vector of big sector in 6 big sectors is ranked up, and is calculated further according to symmetry and obtains itRemaining 5 sequences of operation of each vector of sector.

3. the level SVPWM modulation algorithm of a kind of broad sense three as claimed in claim 2, it is characterised in that in 6 big sectors1st sequence of operation of each vector of big sector according to being ranked up clockwise.

4. a kind of broad sense three level SVPWM modulation algorithm as claimed any one in claims 1 to 3, it is characterised in that to eachFollowing principle is followed when the sequence of operation of vector is ranked up：

Principle one：
Starting vector is all positive small vector；Principle two：
Each switch periods, can only hold once with pass once per phase；Principle three：
Every phase on off state only has between P and O, the switching between O and N.

Specification(s)