Clean Coal and Energy
Vol.2 No.04(2014), Article ID:14335,9 pages
DOI:10.12677/CCE.2014.24006

Simplified Algorithm of Three-Level SVPWM with DSP

Jin Xu, Ailong Zou, Wanli Liu

CSIC Pride (Nan Jing) New Energy Technology CO. Ltd., Nanjing

Email: jianyue312@126.com

Received: Oct. 2nd, 2014; revised: Oct. 20th, 2014; accepted: Nov. 3rd, 2014

ABSTRACT

This paper researches the three-level SVPWM algorithm with DSP. In order to simplify the section judgment and the time calculation of space vector, save the resource of DSP and improve the performance, this paper presents a method that divides the space vector into 6 small hexagon space vectors. In each small hexagon, the same algorithm of two-level SVPWM is used to judge the triangle section and calculate the time of vector. This method simplifies the three-level SVPWM and improves the performance.

Keywords:Three-Level Inverter, SVPWM, DSP

Email: jianyue312@126.com

1. 引言

2. 二极管钳位式三电平逆变器的拓扑

Figure 1. Diagram of NPC

Table 1. The relationship between output voltage and the switch

3. 三电平逆变器的矢量空间

4. 三电平逆变器扇区判断方法

Table 2. Classify of three-level inverter

Figure 2. The space vector of three-level inverter

4.1. 传统的扇区判断方法

4.2. 简化三电平扇区判断方法

(1)

，则，否则；当，则，否则；当，则，否则。令，则与小六边形编号N的关系如表3所示。

4.3. 两电平矢量空间扇区判断

(2)

，则，否则；当，则，否则；当，则，否则

，则S与小三角形编号M的关系如表4所示。

4.4. 矢量作用时间的计算

Figure 3. The traditional method of section judgment

Figure 4. The simplified method of section division

Figure 5. The space vector of No. 1 hexagon

Table 3. The relationship between S & N

Table 4. The relationship between S & M

(3)

(4)

(5)

(6)

4.5. PWM波的产生

(7)

5. 仿真与实验

5.1. 仿真结果

5.2. 实验结果

Figure 6. PWM waveform

Table 5. Time calculation of six triangle section

Table 6. Configuration of CMPR

Figure 7. Simulation waveform

Figure 8. Experimental waveform

6. 结论

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