一种风电机组的低压穿越改造装置研究

Study of the LVRT Upgrading Equipment for the Wind Turbine Generator

介绍了一种简便的1.5 MW双馈风电机组的低压穿越改造方法,该方法不需对机组主控、变桨及变频器进行任何改造,只要在机组并网点处串入一台低压穿越控制设备,就可使风电机组满足GB19963—2011要求的低压穿越能力。在电网故障时,该设备快速关断主功率回路,同时输出无功功率支撑电网电压,并同步发电机定子电压,使机组保持稳定运行。此方法特别适用电控型号较老、低压穿越改造成本较高的1.5 MW风电机组。

A novel and convenient method was presented for the LVRT upgrading of the 1.5 MW DFIG windpower system. This method did not require to upgrade the main control system, the pitch control system or the converter, but only put a LVRT control equipment in series with the wind-power generator at the point of connection the grid, then the equipment enabled the wind-power generator system to meet the GB19963-2011＇s LVRT requirements. When the grid voltage dip occured, the equipment turned off the main circuit instantly, at the same time, generated the reactive power to stabilize the grid voltage, synchronized the generator＇s stator voltage, which made the system operation undisturbed. This convenient upgrading method for LVRT is especially suitable for the old type 1.5 MW DFIG wind-power systems, whose upgrading for LVRT costs too much.