A New Type of Asymmetric Four-Level Inverter

Aiming at the problem of diode-clamped inverter with a large number of switches and the lack of output vector of asymmetric topology, a new asymmetric four-level topology is proposed. Compared with the traditional diode-clamped four-level inverter, this structure reduces the use of switching tubes and reduces the cost; And the DC side voltage divider capacitance is reduced to two, the voltage division ratio is 1:2, and a floating capacitor is added, which makes up for the missing output vector caused by the asymmetric inverter. Because it compensates for the missing output vector, the ideal output waveform can be obtained by using the traditional SVPWM modulation algorithm, avoiding the development of new algorithms. Finally, simulations were built, which proved the feasibility and effectiveness of the topology.