直驱型风电系统低电压穿越技术仿真分析

随着风电穿透功率的增大,在电网电压跌落时切除风电机组的传统控制策略已经不能满足电网安全稳定的要求,因此新的电网规则要求风力发电机组必须具有低电压穿越能力。文中介绍了几种直驱型风电系统常用的直流侧crowbar电路,通过比较,选择直流侧使用卸荷电阻的crowbar电路,并与网侧逆变器配合,实现直驱型风电系统的低电压穿越。仿真结果表明,采用卸荷电阻并配合网侧逆变器控制,可以有效提高直驱型风电系统的低电压穿越能力。

Simulation Analysis on Low Voltage Ride-through Technologies for Direct Drive Wind Power System

With the increase of wind power penetration, the traditional strategy, which reseets wind turbines when power grid vohage drops, does not meet the requirements for grid security and stability, so new rules require wind turbines connecting to grid must have the capability of low voltage ride-ttmmgh, meanwhile provide some reactive power. This paper introduces several Crowbar circuits which are used fi）r direct drive wind power system. By comparison, resistance to unloading Crowbar circuit of DC side is selected for realizing the low voltage ride-through, acting in concert with the network side of the inverter. The simulation result shows that unloading resistance with the network side inverter controlling can effectively improve the capability of the low voltage ride-through of the direct drive wind power system.