The Research Of Three-phase PWM Rectifier Adaptive Deadbeat Control Algorithm

At present, due to the development of power electronic technology, power electronics converter device to a lot of work, however, the conventional still adopts the traditional diode rectifier link or phased rectifier. Lots of current harmonic and reactive power into the grid, the grid will be contaminated. Along with the social and the environment demand for green energy, PWM rectifier due to its can run unit factor、low harmonic pollution and energy bidirectional transmission, etc. It has been widely attention, its research have great significance.The article detailed introduces the working principle and characteristics of the three-phase voltage source PWM rectifier. Assuming the three-phase grid voltage equilibrium, establish the mathematical model of a-b-c、α-β、d-q coordinates,and briefly introduces the parameterselection of the main circuit of the grid side inductance and DC side capacitor, also analyzed the SVPWM theory principle and its implementaion process.The subject use the commonly double closed loop control strategy, the current loop use the deadbeat current predictive control, the voltage loop use the PI control.in order to weaken the control delay effects on the whole control process, in this subject, made some improvements on the traditional algorithm, its discrete system function was deduced, and a simulation analysis was carried out.Duo to the complexity of rectifier working environment, different working condition and its running state, the circuit parameters are not constant. The deadbeat current control as a kind of control method based on accurate model, its control is very sensitive to the inductance parameters. As much as possible to ensure the accuracy of the system model, paper to join the adaptive algorithm, parameter online identification was used, accurately identify parameter and feedback to the system model. The paper, forgetting factor recursive least-squares algorithm is used to estimate parameters. The convergence and reliability of this method is verified by simulation and experiment.For hardware experiment, use the IPM as the foundation of the Power circuit, IPM integrating power switch tube and drive circuit, the main control circuit using floating-point digital signal processing chip TMS320F28335,use the touch screen as human-computer interaction channels, the article fifth chapter some of the key part of the experimental platform design. In the experimental platform, the software program of the control strategy and parameter identification was design、debugging and implementation. In the simulation platform and experimental platform, the feasibility and reliability is verified.