FPGA-based multi-level inverter multi-carrier pulse generation theory and implementation method

Multi-module cascaded multi-level inverters are more and more widely used in high voltage and large power industrial applications. Its unique topological structure requires multi-channel drive pulse. Therefore, generating multi-channel drive pulse becomes one of the key issues. This paper presents a digital implementation method, which combines double and multicarrier horizontal phase shift PWM modulation strategy in terms of H-bridge cascaded multi-level inverter, describes the multicarrier pulse generating theory in detail, and offers the specific implementation method for a kind of general purpose multicarrier pulse generator based on FPGA. Finally, a set of multi-level inverter digital experimental system was built based on DSP and FPGA. The experimental results indicate that the multiple-pulse digital implementation method features outstanding expandability and commonality.