Research On Three-level Active Neutral Point Clamped Inverter Based On Model Predictive Control

Multi-level inverter with its good quality of output voltage waveforms,low harmonic distortion rate and high efficiency has been widely used in high voltage and high power applications..Based on the study of Model Predictive Control(MPC)algorithm for the Active Neutral-Point-Clamped(ANPC)inverter,Neutral-Point Potential(NP)balancing,Common-Mode Voltage(CMV)are studied in this paper.The main content of this paper as follows:1.The mathematical model and the mathematical model of the space vector of ANPC inverter are established,and then the mathematical model is discretized.2.A three-level ANPC inverter experimental platform based on DSP+CPLD is set up.The experimental results are provided to verify the validity of the above control strategies.3.On the basis of the above research,the expression of NP for three-level ANPC inverter is derived.Premise to ensure the flux error in a certain range,effectively reduce the offset of the neutral-point potential,so that achieve three-level ANPC converter of the neutral-point potential control.4.Further on the basis of the above study,the expression of CMV for three-level ANPC inverter is derived.A modulation model predictive algorithm for the three-level ANPC inverter is proposed,to balance NP potential and reduction Common-Mode Voltage.The NP offset is added to the cost function to control the NP balance,and the vector with large common mode voltage are abandoned,so as to suppression CMV.