Research Of Multipulse Power Electronic Converter Device Controller Based On FPGA

In order to further improve the stability of system operation and achieve digital control and intelligence,high-performance digital triggers are necessary for the normal operation of thyristors in the practical application process of power electronic converter equipment,which is increasingly becoming the important direction of power electronic equipment research for today's main power device of thyristors.According to the requirements of a 150V/40 kA single-machine 24-pulse-running rectified power system proposed by a domestic research institute,a high-performance thyristor digital trigger is developed on the foundation of the detailed analysis of the development history and trends of thyristor triggers,which include pulse phase shift,pulse distribution,phase sequence adaptation,phase loss protection,overvoltage,overcurrent,external fault,human-computer interaction and other functions.FPGA is used as the core control device in the design processes,which is supplemented by DSP for DMA initialization,signal conditioning,PID control,and data processing.The purpose of combining with the synchronization circuit,power supply circuit,protection circuit,pulse isolation drive and serial communication circuit is to complete the hardware design and implementation.Primarily using C language and VHDL language to realize pulse modulation,double-narrow pulse formation and trigger accuracy,then the simulation simulation of relevant functions is performed through software simulation.Finally,the controller is used for pulse trigger debugging and pulse phase shift debugging.Through a series of tests and analysis of test waveforms and simulation results,it is shown that the thyristor trigger can accurately generate 24 pulsing pulses with good symmetry and fast response,achieving flexible control,reliability,high precision,and good output waveform symmetry,reducing the AC side input current harmonics,improving power factor and other good results.