【摘要】 为使永磁风力发电系统在并网和孤岛两种模式下能够实现平滑的切换,采用下垂控制。现有的下垂控制策略虽然能实现两种模式的切换,但是孤岛运行切换并网运行瞬间会对电网造成冲击。为了能实现稳定的切换以并网逆变器为研究对象,分别提出了风电微网并网运行、孤岛运行模式下的改进下垂控制策略。实现了系统在孤岛模式下随机切入负荷的均匀分配和稳定运行,以及并网模式下直流母线电压的稳定和风力发电机组最大功率的输出。设计了并网预同控制器,以保证并网时不会对电网产生巨大的冲击电流。经过仿真分析,结果验证了改进下垂控制的正确性和可行性。更多还原

【Abstract】 Because that the switching of permanent magnet wind power generation system can realize smooth in grid and island two modes,droop control was used. Although the existing droop control strategy can realize the two modes of the switch,the switching operation for islanding operation of grid connection can cause impact on the power grid. In order to achieve a stable switching to grid connected inverter as the research object respectively,we proposed a wind power micro network,and improved droop islanded control strategy. The system in islanding mode was realized under random starting load uniform distribution and stable operation,and the maximum power output the DC voltage of grid connected mode and the stability of wind turbine. The interconnection presynchronization controller was designed to ensure that there won’t have a huge impact current when grid is connected. Through simulation analysis,the results verify the correctness and feasibility of the improved droop control.更多还原