【摘要】 双PWM变换器是MW级双馈型风力发电系统中的关键部件。在大功率风电变换器中,由于杂散电感的存在,器件在关断过程中往往会产生超出允许范围的瞬态尖峰值,从而导致其失效和损坏。因此,在研制兆瓦级双馈型风力发电变换器时要考虑如何对变换器回路的等效杂散电感进行抑制。针对上述问题,通过构建2MW双馈型风电变换器功率主回路杂散电感等效分布模型,分析了杂散电感在器件关断过程中的影响。在此基础上,提出一种低感平面母线技术来抑制主回路的总杂散电感,并采用基于虚功原理的电磁场知识来对其电感值进行理论分析和计算。从结构设计和工程应用角度出发,对该母线的使用进行分析。样机试验结果表明,所提方案较之传统设计在抑制主回路杂散电感上更具有效性。更多还原

【Abstract】 The dual-PWM power electronic converter is a key component in the doubly fed wind power generation.In large production converters,due to the stray inductance,the switching transient spike is usually beyond the voltage allowed by the device,which can destroy the converter.So,it is necessary to consider the suppression of the stray inductance in the circuit in the development of MW doubly fed wind power.A simplified electrical model of stray inductance in 2 MW doubly fed wind power dual-PWM converter was built,where the influence was analyzed.A proper low inductance bus-bur was designed to reduce the stray inductance.The analysis by electromagnetic field theory for it and the structure design in practice were introduced.The result of the experiment in the prototype shows that the design and analysis is more effective in suppressing the stray inductance in the circuit than traditional methods.更多还原