风电变流器，是双馈风力发电机中，加在转子侧的励磁装置。其主要功能是在转子转速n变化时，通过变流器控制励磁的幅值、相位、频率等，使定子侧能向电网输入恒频电。包括功率模块、控制模块、并网模块。
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本论文来源于1.5 MW风电变流器的研制项目，主要研究内容是网侧数字化并网逆变器的开发。
This paper comes from a project of developing 1.5mw wind power converter the major content of which is developing digital inverter in grid-side.
风电变流器在国产化的过程中也必须要具有低电压穿越、不对称故障下运行的能力和动态无功、有功功率的调节能力。
The wind power converter must possess abilities of Low voltage Ride through (LVRT), available operation with unbalanced voltage fault and adjusting active as well as reactive power.
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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