基于小波变换的电压暂降定位 利用模极大值原理实现暂降起止时刻的准确检测-voltage sag lacote based on wavelet transform Used to achieve maximum modulus principle sag beginning and ending time of the accurate detection

小波变换对电能质量暂态信号的分析和运用，包含电压骤升、骤降等-Wavelet transform for power quality analysis and the use of transient signals, including voltage dips, swells, etc.

用脉冲宽度按正弦规律变化而和正弦波等效的PWM波形即SPWM波形控制逆变电路中开关器件的通断，使其输出的脉冲电压的面积与所希望输出的正弦波在相应区间内的面积相等，通过改变调制波的频率和幅值则可调节逆变电路输出电压的频率和幅值-With pulse width according to the sine law of change and equivalent sine wave inverter PWM waveform of SPWM waveform control circuit swit

GUI界面演示行波驻波 行波驻波与行驻波波形及电压电流特性的分析-Analysis of traveling wave standing wave and traveling wave shape and voltage current characteristics of GUI interface