Research On The Control Strategy And The Applications Of PWM Rectifiers Based On DSP

The PWM rectifier provided revolutionary idea and method for the power converter and control technology. The advantages include high power factor, sinusoidal ac current and bidirectional power etc. This paper considers traction power supply, electric drive application, has discussed several kind of advanced controls strategy of the PWM rectifier and its DSP realization.First, the topology, operation principle and mathematical modeling of PWM rectifier are researched, the design of main circuit parameters is given, and also basic control method is discussed.This paper imports the dummy net linkage conception, through voltage, electric current and condition estimate flux linkage. Then dummy linkage direction detection vector control strategy is given, netside voltage sensorless control of PWM rectifier is realized. Control performance has carried on the simulation and the experimental confirms.In the rapid transit power supply, the MW wind power generating system, often needs to carry on multiple parallel to the PWM rectifier realizes the high power operation. In the single synchronous PI current control foundation, this paper gave a detail research on parallel multiple current sharing and harmonic reduction control. Proposed the d/q axis transmit current instruction sharing method. Has developed the parallel rectifier prototype, used the CAN communication and the delayed sampling technology has achieved the control goal.Meanwhile, a new PWM rectifier control method of 8K electric locomotive inverter experimental system is propounded. The 50kW PWM rectifier ac side is connected the inverter output through the inductance, PWM rectifier dc line output parallel with inverter dc input. The device, using forecasting current arithmetic under a three-phase static coordinate, can complish fully loading experiment and over loading, miss phase fault experiment.The device realized energy recyclem, saves lots of experimental energy. This system already through the approval and put into operation in the scene, has the merit of structure simple, free control, energy saving and noise reduction.