SVPWM 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 A

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1 Vol 18 No 1 JOURNAL OF HARBIN UNIVERSITY OF SCIENCE AND TECHNOLOGY Feb 2013 SVPWM 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 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 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% E gaoxd1973@ 163 com digital signal processor DSP

2 i a IGBT VT4 VT1 t d VD4 t on VT1 t d + t on VD1 VT 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 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

3 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 t cm + = τv dc + DT s - τ V s 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 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 < θ e 180 c < θ e 240 b < θ e 360 a V X T X V dt SVPWM V X V dt V dt D T s + τ V d + τv dc + DT s - τ V s t cm + V dc + V d - V s = IGBT

4 VT3 VT1 VT5 VT3 VT1 VT5 3 10Φ Q1 Q6 60 SVPWM VT1(U+) VT4(U-) VT3(V+) VT6(V-) VT5(W+) VT2(W-) 棕 t/( ) 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 Φ SVPWM ( 椎 10) (01 椎 ) U3(011) (0 椎 1) U2(010) 兹 U out U1(001) ( 椎 01) U6(110) U5(101) (1 椎 0) U4(100) (10 椎 ) A V Hz Φ01 10Φ U out SVPWM Φ U out Φ01 6 Q3 Q2 101 Q1 Q6 Q5 U out Φ U out 101 Q1 Q6 Q5 Φ 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 U 1 U U 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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