The Research And Development Of Low-Voltage Static VAR Generator Based On TMS320F2812

With the development of economy and society, the requirements of power quality for electrical equipments are ever increasing. Reactive power is one of important factors influencing on the power quality. It is an effective way to compensate dynamic reactive power by connecting the static var generator on the grid. Improve the quality of the grid voltage and ensure that users get the high efficiency of electric power by this way.By analyzing the principle of static var compensation, a static var generator was designed for dynamic reactive power compensation. The reactive and active current was detected based on instantaneous reactive power theory. Two-loop digital controller was designed based on the mathematical model in the d-q Coordinate system. Inner current loop controller was the two degrees of freedom controller. The ideal inner loop characteristic polynomial on the Time-domain performance was established. Polynomial method was used to place poles. The Command current and the current disturbance were Controlled separately.In this way the system had good tracking performance, disturbance rejection and robust performance. The ideal characteristic polynomial of outer voltage loop for the time-domain performance was established. Polynomial method was used to place poles. The controller had specific link, so that the system had good disturbance rejection performance, and effectively reduced the measurement error. The output voltage of bridge inverter was controlled on svpwm. Power stage of ASVG was three-phase voltage source bridge inverter, and power was transmitted through the filter inductance. Control unit was designed based on TMS320F2812. And the auxiliary circuits including voltage and current detection circuit, protection circuit, driver circuit, PLL circuit, power supply were designed. DSP software was program in C++ language to monitor and control the system.The performance of hardware and software was tested. And the results of test were analyzed. The experimental test results show that the ASVG fulfils the design requirements basically and can compensate reactive power for the power grid dynamically.