低电压穿越能力Low voltage ride through capability就是指风力发电机的端电压降低到一定值的情况下不脱离电网而继续维持运行甚至还可为系统提供一定无功以帮助系统恢复电压的能力具有低电压穿越能力的风力发电机可躲过保护动作时间故障切除后恢复正常运行这可大大减少风电机组在故障时反复并网次数减少对电网的冲击
风电场低电压穿越能力对电力系统的稳定性有着重要影响。
The low voltage ride-through (LVRT) capability of wind farms has a great impact on the power system stability.
为增强直驱型变速恒频风电系统的低电压穿越能力，采取了变流器直流侧增加卸荷负载以在故障时消耗掉直流侧多余的能量，使风电机组的正常运行基本不受电压跌落影响的应对措施。
By adding damp load at DC-side of the converter, redundant energy at DC-side during grid faults will be consumed, therefore the operating of wind turbine will not be influenced by grid voltage sags.
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