With the increasing attention to environmental issues,more and more distributed energy systems repre-sented by microgrids are appearing in the power system,which also poses some challenges to the traditional power sys-tems. For example,the delay in digital control system,variations in grid impedance of weak grid and the interaction be-tween parallel converters in microgrids will cause adverse effects on the stable operation of microgrids. On this basis,a novel type of grid-forming control method for microgrid considering control delay and variation in grid impedance is put forward to enhance the stability of microgrids under uncertainties. First,the above problems are modeled,and a delay compensation method is proposed to improve the robustness of the control system with respect to the variation in grid impedance. Then,a feedforward loop is introduced into the control system to protect it from the interference of parallel inverters in microgrids. Finally,experimental results demonstrate the effectiveness and superiority of the proposed control method.
关键词
控制延迟/相互作用/电网形成逆变器/微型电网/稳定
Key words
Control delay/interaction/grid-forming inverter/microgrid/stability
维普
万方数据