18 1 2013 2 Vol 18 No 1 JOURNAL OF HARBIN UNIVERSITY OF SCIENCE AND TECHNOLOGY Feb 2013 SVPWM 150050 三相电压源型逆变器的死区时间效应可能会导致电压损失, 电流波形畸变和转矩脉动 为了改善电流波形, 减少转矩脉动, 详细分析了死区时间对输出电压的影响, 并提出了 SVPWM 死区时间的补偿方法 该方法通过改变传统的 180 导通模式为 120 加 180 轮流导通模式, 由于交替使用两种导通方法, 死区时间的影响可以减少到零 与传统的 SVPWM 技术相比, 所设计方法实现简单, 只需要修改部分软件程序, 并通过仿真和实验结果验证了其正确性和算法的可行性 空间矢量脉宽调制 ; 死区补偿 ; 导通模式 TM464 A 1007-2683 2013 01-0099- 05 Study of a Novel Dead-Time Compensation Method for SVPWM GAO Xu-dong QIN Jin-ping College of Electrical and Information Engineering Heilongjiang Institute of Technology Harbin 150050 China Abstract The dead-time effect in a three-phase voltage source inverter can result in voltage losses current waveforms distortion and torque pulsation In order to improve the current waveforms and decrease the torque pulsation this paper analyzes the influence of dead-time on output voltage in detail and proposes a dead-time compensation method of space vector pulse-width modulation SVPWM The proposed method changes the traditional 180 degree turn-on mode into 120 degrees plus 180 degrees turn-on mode through which the influence of dead time can be reduced to zero due to the alternate use of the two strategies Compared to traditional SVPWM technique the designed method is simple to realize because only part of program needs to be modified and the correctness and feasibility of the algorithm are also verified by simulation and experiments results Key words space vector pulse-width modulation dead-time compensation conductive mode 0 space vector pulse-width modulation SVPWM SP- WM 15% 2012-04 - 12 E070303 1973 E-mail gaoxd1973@ 163 com 1963 1-8 digital signal processor DSP
100 18 1 i a IGBT VT4 VT1 t d VD4 t on VT1 t d + t on VD1 VT1 9-15 1 16 VT1 VT4 t off VD4 t off 2 i a VT4 VT1 t off VD1 t off IGBT VT1 VT4 1 t d t on t off T x x 0 7 8 2 SVPWM 1 - A PWM 18 f c t c V dc i a > 0 Δu N = 1 { - f c t c V dc i a < 0 1 A t = t d + t on - t off f c SVP- i a > 0 A WM T x i a < 0 17 V dc + - VT4 i a>0 i a<0 VD4 t d VD1 t on VT4 t d + t on 2 t d A
1 SVPWM 101 t d T s T x t on + t on - D = T x /T s τ = t d + t on - t off B C A 2 A+ A- A+ A- U dc i a<0 i a>0 t d t off 理想 PWM 死区时间 PWM T x 理想电压 t on 实际电压 1 t off 实际电压 2 ton t d 2 2 1 t cm + = τv dc + DT s - τ V s + 1 - D T s + τ V d V dc + V d - V s 3 t on + = T x + t cm + 4 t cm - = τv dc + DT s + τ V d + 1 - D T s - τ V s V dc + V d - V s 5 t on - = T x - t cm - 6 A t rct = T x + t cm + + t cm - 7 t rct = T x - t cm + + t cm - 8 t rtc V dc V s V d 1 θ e - 60 < θ e 0 c - 0 < θ e 60 b + 60 < θ e 120 a - 120 < θ e 180 c + 180 < θ e 240 b - 240 < θ e 360 a + 2 2 2 V X T X V dt SVPWM V X V dt V dt 180 180 60 19 1 - D T s + τ V d + τv dc + DT s - τ V s - 120 t cm + V dc + V d - V s = 0 2 120 IGBT 180 120 60 120 3 3 120
102 18 VT3 VT1 VT5 VT3 VT1 VT5 3 10Φ Q1 Q6 60 SVPWM VT1(U+) VT4(U-) VT3(V+) VT6(V-) VT5(W+) VT2(W-) 0 60 120 180 240 300 360 棕 t/( ) 3 120 t 1 = 槡 3 槡 2 U 1 U 1T s sin π 6 - θ IGBT t 2 = 槡 3 槡 2 U 2 U 10 1T s sinθ t 0 = T s - t 1 - t 2 4 20 1 0 Φ SVPWM ( 椎 10) (01 椎 ) U3(011) (0 椎 1) U2(010) 兹 U out U1(001) ( 椎 01) 4 60 30 U6(110) U5(101) (1 椎 0) U4(100) (10 椎 ) 4 12 450 A 1 200 V 360 12 5 6 5 6 30 133 Hz 1 000 Φ01 10Φ U out SVPWM Φ01 101 4 5 U out Φ01 6 Q3 Q2 101 Q1 Q6 Q5 U out 101 10Φ U out 101 Q1 Q6 Q5 Φ10 101 U out 4 15 ( ) π ( θ ) t 1 U 1 sinθ = t 2 U 2 sin π 6 - θ t 1 U 1 cosθ + t 2 U 2 cos 6 - = T S 2 } U out 9 t 1 t 2 180 U 1 U 2 180 120 2U dc /3 U dc / 槡 3 U out 槡 3 U dc /2 t 1 t 2 ( ) 3 IPM 45 kw Y TMS320F2818 DSP FF450R12KT4 IGBT 5
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