Math Demonstration and Practical Application of Fundamental Voltage Amplitude Linear Output Based SVPWM Overmodulation Control

Based on the amplitude control of the reference voltage vector and the vertex voltage vectors, this paper presents a novel digital over modulation control strategy for SVPWM inverters, which can manage the transition from the linear control range to six-step operation smoothly. Unlike the other over modulation methods, this strategy avoids storing data in advance, and is very simple and very suitable for practical digital implementation. The feasibility of this strategy is validated by math demonstration. Furthermore, the mathematic analyses show that the output fundamental voltage amplitude is linear proportional to the modulation index. The simulation and experimental results verify that this strategy is very useful for the induction motor with the linear fundamental voltage output gain, low THD and simple application