基于基波电压幅值线性输出控制的SVPWM过调制新算法

A NOVEL ALGORITHM OF SVPWM INVERTER IN THE OVERMODULATION REGION BASED ON FUNDAMENTAL VOLTAGE AMPLITUDE LINEAR OUTPUT CONTROL

传统的空间矢量脉宽调制(SVPWM)过调制控制需要预先存储大量的数据,系统存储量庞大,但控制精度却不理想。该文提出了一种新颖的基于基波电压幅值线性输出控制的SVPWM过调制算法,该算法不需要存储数据,能够使逆变器平滑的从线性调制工作状态过渡到六阶梯波工作状态,非常适合数字化应用。文中分析了应用该算法以后, 逆变器输出电压的谐波畸变(THD)情况,以及主要谐波成分百分含量的变化情况,并和其它控制算法进行了技术指标对比。分析及相关实验证明,该算法具有输出基波电压增益线形、谐波电压含量低以及实现简单的优点,非常适合异步电机实际应用。

It needs to store lots of data in the controller of the classical overmodulation technique for spase vector pulse width modulation（SVPWM）, which makes a huge memory while the control resolution is not perfect. Based on fundamental voltage amplitude linear output control, a novel digital overmodulation control strategy for SVPWM inverters is presented, which can manage the transition from the linear control range to six-step operation smoothly. Avoiding the necessity of the stored data implementation, this strategy is simple and very suitable for practical digital implementation, The harmonic components and the total harmonic distortion （THD） of the output voltage were analyzed and compared with other strategies. Math analyses and experimental results, obtained by DSP board, verify that this strategy is very useful for the induction motor with the linear gain, low THD and simple application.