基于改进下垂控制的微电网有功与频率控制策略

Active and frequency control strategy of micro-grid based on improved droop control

在分析传统下垂控制调整系统有功和频率过程基础上,提出了微电网在离网和联网运行时下垂控制的两种改进措施。利用改进控制策略,可以实现微电网离网运行时的频率恢复过程,实现稳态时的无频率偏差运行;联网运行时微网中逆变型电源根据预先设定的有功功率值自动投入运行:对于储能装置,自动转换为吸收有功功率;对于可调型微源,可以发出预先设定的额定有功功率。最后通过Matlab/Simulink仿真验证了所提策略的有效性。

On the basis of analyzing the process of the traditional droop control system to adjust the active power and frequency, two improvement strategies of micro-grid operation in grid connected and isolated mode are proposed in this paper. Using the improved control strategy, micro-grid can operate at the rated frequency after reaching steady state in isolated mode. Inverter based source can supply active power according to the preset of the active power value auto- matically in grid connected mode, and for energy storage device, it will convert to absorb active power from the grid, and for adjustable micro source, it can supply a rated active power. Finally, the Matlab/simulink simulation results validate the effectiveness of the proposed strategy.