定桨距异步风电机组的低电压过渡能力改造

金风750 kW定桨距异步风力发电机组因无电力电子变频装置而不具有抵御电网电压跌落的能力.针对这一问题,对上述风机进行低电压过渡能力改造,通过在风机与箱式变压器之间设计安装彩钢板房,加装D-VAR RT电力电子设备,使风机在电网故障时保持发电机机端电压在额定水平上.改造后对系统进行了仿真建模试验,模拟电网电压跌落至额定值的20％极限状态下的风机与电网电压、电流变化情况,并进行了D-VAR RT设备并网运行后的静态试验数据采集分析.试验结果表明:改造后的风机具备低电压过渡功能,满足《风电场接入电力系统技术规定》要求的低电压过渡能力.

Low Voltage Ride Through Revamp of Low Voltage Ride Through for Fixed Pitch Asynchronous Wind Turbine Generator System

Jinfeng 750 kW fixed pitch asynchronous wind turbine power generator does not have ability to resist the power grid voltage drop owing to no power frequency electronic inverter devices.To solve this problem,revamp of low voltage ride through has been undertaken to wind turbine mentioned above,through design and installation of color steel plate between the fan and box-type transformer and installation of D-VAR RT power electronic devices so that can maintain generator terminal voltage at rated level when wind turbine power generator is in power grid failure.After revamp,we have made system simulation modeling experiments,to simulate situation of power grid voltage and current changes when grid voltage drops to 20% under ultimate state,and make static data acquisition analysis after parallel operation of D-VAR RT equipment with power grid.Testing results show that after revamp,wind turbine has low voltage ride through function to satisfy requirements of low voltage ride through stipulated in Technical Requirements of Wind Farms Parallel into Power Systems.