The implementation of dynamic voltage restorer (DVR) based on DSP

In this paper, according to the voltage sag problem with phase angle jump, the principle of the dynamic voltage restorer (DVR) is analyzed. Based on the fundamental component of steady-state equivalent circuit, the phase diagram with voltage fluctuations and phase angle jump is shown. According to instantaneous reactive power and the low-pass filter theory, the phase jump angle and initial phase of the source fundamental voltage are given. And with the optimum voltage injection angle based on minimum energy compensation, the voltage target function which gives the appropriate compensation output voltage of DVR is determined. The simulation process and results are also given. A prototype using digital signal processing (DSP) as the master control chip is designed and the software development process is given. Finally, the experimental results are provided to verify the rationality of the optimal voltage injection angle of series compensation based on the minimum energy control strategy.