生成三相,三级脉冲宽度调制信号或传输设备的波形
SIMSCAPE /电气 /控制 /脉冲宽度调制
这
根据块输入来计算内门和偏离时间:
Three sinusoidal reference voltages
A DC-link voltage
直流链接中性点平衡控制信号
Uses the gating times to generate 12 switch-controlling pulses.
使用门控时间生成调制波形。
This block allows you to choose natural, symmetric, or asymmetric sampling of the modulation wave.
这
但是,基于载体的PWM对于显示您选择的采样模式如何与块生成的脉冲的开关和关闭行为有关。使用三级,基于载体的PWM方法的发电机:
样品参考波。
Compares the sample to two parallel triangle carrier waves, separated by one level.
Generates a switch-on pulse if a sample is higher than the carrier signal or a switch-off pulse if a sample is lower than the carrier wave.
To determine switch-on and switch-off pulse behavior, a three-level carrier-based PWM generator uses these methods to sample each of the triangle waves:
自然 - 采样和比较发生在调制波和载波波的交点处。
不对称 - 采样发生在载波的上和下边界。比较发生在采样后的交叉点上。
对称 - 采样仅发生在载波的上边界。比较发生在采样后的交叉点上。
这modulation index, which measures the ability of the power converter to output a given voltage, is defined as
在哪里
mGydF4y2Bais the modulation index.
v
v
For three-phase SPWM,
在哪里
v
v
对于三相空间矢量PWM(SVM),
对于正常的稳态操作,
如果发生过度调制,则功率转换器夹在正或负直流轨道上的输出电压。
GydF4y2BaIn the<一个href="//www.tatmou.com/de/de/help/physmod/sps/ug/three-phase-three-level-pwm-generator.html" class="a">三相三级PWM发电机一个>示例,
这modulation index is greater than one between 0.03–0.09 seconds. During overmodulation:
这pulse remains in the on or off position.
输出电压夹在正或负直流导轨上。