并网永磁直驱风电机组故障穿越能力仿真研究

随着电力电子器件成本下降,拥有全功率变换器的永磁直驱风机成为各国关注热点。风电场容量不断增大,要求风电机组具有故障穿越能力。本文以直驱同步风电发电机组为研究对象,利用matlab/simulink搭建了直驱同步风电机组的动态数学模型,对直驱同步风电机组故障穿越能力进行仿真研究,试验结果表明：在风电场接入点发生故障时,直驱同步风电机组具有故障穿越功能。尤其在电网发生电压跌落时,直驱风机能为系统提供一定的无功支撑。有效防止系统电压过多降落。提高了系统故障运行的稳定性。

Fault Ride-Through Simulation of Permanent Magnetic Synchronous Generator Connected into Power Grid

As the cost of power electronics falls down, the permanent magnetic synchronous generator (PMSG) with fully-rated converters has become a hot issue. With wind farms becoming larger and larger, the wind turbine must have the ability of fault ride -through (FRT). This paper focuses on the permanent magnetic synchronous generator (PMSG). By establishing the dynamic model of PMSG under the environment of simulink of matlab, this paper simulates the fault ride -through (FRT) of the permanent magnetic synchronous generator connected into power grid. Simulation results show as follows: when there is a fault on the point of common coupling, the permanent magnetic synchronous generator has the capability of fault ride-through (FRT). Especially when there is a voltage dip on the grid side, the permanent magnetic synchronous generator could produce reactive power for power grid, effectively preventing the system voltage from declining seriously, so as to improve the system stability under faults.