Development Of VIENNA Rectifier With AC/DC Input Compatibel

With the rapid development of modern industries,the demand for three-phase rectifiers is increasing.The VIENNA rectifier has been widely used in industrial fields due to their advantages of high efficiency,high power density and high reliability.Firstly,This paper analyzes the operating modes and topology structure of the three-phase VIENNA rectifier,and establishes a mathematical model of the VIENNA rectifier in the dq synchronous rotating coordinate system.The control block diagram of double-loop dq decoupling is given.Then the three-level conversion two-level SVPWM control is introduced.VIENNA has a problem that the zero-crossing distortion of the VIENNA rectifier will occur at the zero-crossing point,this paper analyzes several factors that affect the zero-crossing distortion,including the zero-crossing current spike caused by the sampling delay and the traditional seven-segment SVPWM intermittently appearing at the zero-crossing Zero current platform.It is found that the five-segment SVPWM is in the CCM mode at a zero-crossing point and a certain phase is driven constant.Then a method of replacing the traditional seven-segment modulation with a five-segment SVPWM modulation at the zero-crossing point is proposed to improve the zero-crossing distortion.The compensation range needs to be optimized.It was verified by simulation and a 5k W VIENNA prototype.The data shows that the zero-crossing five-stage compensation THD improves significantly at light load.In order to expand the application scope of the device,the VIENNA rectifier can also achieve regulated ouput voltage when it is DC input.A staggered control method capable of achieving midpoint voltage balance under DC input is proposed.The working principle is analyzed in detail and simulation is performed.Finally,the hardware and software of the VIENNA converter compatible with three phase 380 V AC input and 450 V DC input are designed.A 10 k W VIENNA prototype is built to experimentally verify the working conditions.The experimental results show the correctness of the theoretical analysis.