Small-signal Stability Analysis of Paralleled Converter System under Power Quality Control Strategy for Microgrid

Abstract In order to enhance the output voltage stability of converter system under non-linear and unbalanced load conditions, the power quality control strategy based on fault-tolerant control architecture is adopted. By analyzing the principle of power quality control strategy, a mathematical model of parallel converter system is established. The mathematical model of the paralleled converter system is linearized at the steady-state operating point, and the corresponding small-signal mathematical model is established. The small-signal stability of the paralleled converter system under the power quality control strategy is analyzed. The results show that under the power quality control strategy, the output voltage stability of the converter system is improved, and the small interference stability of the parallel converter system is guaranteed.