一种端电压直接合成的两电平逆变器PWM算法

A PWM Based on Terminal Voltage Direct Synthesis for Two Level Inverters

SVPWM控制以其较高质量的输出电压获得了广泛的引用,但存在算法复杂的缺点。针对其缺点,本文研究了一种基于端电压直接合成的PWM算法,通过对传统SVPWM算法伏秒平衡式的推导,强化约束条件,获得了新的伏秒平衡规则,简化了计算过程,减少了计算时间。此外,本文在此算法基础上推导了其最大调制度,并提出了窄脉冲补偿方法。最后,将此算法成功应用到两电平逆变器控制中,实验结果证明了控制算法的有效性。

SVPWM is widely used for its high-quality output voltage.However,the complexity limits its further applications.A new PWM strategy based on terminal voltage direct synthesis was studied to overcome the disadvantages of the traditional SVPWM schemes.A novel voltage second balance rule was obtained by setting a stronger constrain for traditional SVWPM voltage second rule.The new PWM strategy simplified the computational process and can reduce the calculation time.Besides,the maximum modulation index was got and a simple minimum pulse width compensa-tion method based on the strategy was presented.Finally,the validity of the proposed strategy was experimentally veri-fied.