HIGH-PERFORMANCE CONTROL METHOD FOR CARRIER-BASED MODULATION T-TYPE THREE-LEVEL CONVERTERS

原文（中国語）

The invention relates to a high-performance control method for carrier-based modulation T-type three-level converters. The method includes: Srepresenting the mathematical model of the converter using the switching function; Srepresenting the three-phase modulation signal using the sine function, and representing upper and lower carrier signals using the piecewise function; Sdetermining the time distribution of the converter switching state and obtaining the critical phase shift angle of the lower carrier under the switching state without maximum common-mode voltage; Ssampling voltage values of two DC-side capacitors and using the voltage difference as the basis for left or right shifts of the lower carrier; Scomparing the three-phase modulation wave with the upper and lower carriers to output the switching pulse signal. This method addresses neutral-point potential balance, common-mode voltage suppression, and reduces digital processor resource usage during PWM modulation.