Study On Control System Of ASVG Based On DSP

In electric power system, with the increasing of density of using electricity in big cities and load center and the using of the EHV transmission long-distance line, the stability of electric power system becomes more outstanding, and reactive power compensation of power quality is becoming more and more important. Traditional reactive power compensation equip ,Such as TCR, TSC and combinations ,they couldn't meet the demand for rapid dynamic reactive power compensation As a core technique of flexible AC Transmission, advanced static var generator (ASVG) has gradually become a hot point in the electric power electronics area for its forerunner's control function and good compensate result. This reactive power compensation application in the transmission network ,it could increase the transmission capacity of power transmission network,enhance system stability, thereby, improved the quality of power supply.This paper analyzd research and developmental trend in domestic and foreign of ASVG, introduced the working principle of ASVG from different angles, and makes a detailed analysis on the control methods. On the basis of the analysis of the working principle of ASVG and SVPWM control strategy,designed hardware and software of ASVG control system based on DSP, and completed the design on the main electric circuit and control electric circuit of the hardware system. The main electric circuit choosed the IPM module PM15RSH120 of the Mitsubishi company, and the controling electric circuit choosed TMS320LF2407A for the core chip, being composed of the DSP control board, signal acquisition and signal processing electric circuit, and the IGBT driving circuit, etc. The software mainly designed main program, interruption sampling subprogram, the FFT subprogram and PWM generation subprogram..In this paper, took inductance load as example had done simulation experiments in the laboratory, had done the experiments to each ASVG unit, including data acquisition, frequency measurement, output PWM pulse of the 2407A DSP, Compensation function experiment. All circuits and the subprogram had passed laboratory tests respectively, and the basic functions of ASVG control system had come true.The experimental results showed that: when inductance load be changed, ASVG control system can compensate reactive power automatically and the effect of compensation was preferably, and the use of current direct control method improved the system's response speed and control precision.