多脉波整流电路在直驱式风力发电中的应用

Research on Multi-pulse Rectifier suitable for Direct-drived Wind Power System

直驱式风力发电系统的应用越来越广泛,为此有必要对其整流变换部分的实用电路之一,即多脉波整流电路进行研究。该电路拓扑采用两个六脉波整流器串联,并通过移相变压器实现多脉波输出。通过相位补偿,其交流侧可以得到THD<3%的正弦电流。由于电路中只使用无源器件,并且在达到同样性能的前提下,比其他整流电路所用器件少很多,因此降低了整个系统的成本。此外,与其他多脉波整流器相比,可以附加一个额外的低功率谐波注入电路,以进一步提高该拓扑结构抑制谐波的性能。仿真和实验证明,多脉波整流电路具有高功率因数、低谐波特性,非常适合用于直驱式风力发电系统。

Multi-pulse rectifier circuit,one of practical rectifier topologies is described,which is especially suitable for direct-drived wind power system.Two six-pulse rectifier bridges fed by a phase-shifting transformer are connected in series to form multi-pulse system.From phase compensation,this converter draws almost sinusoidal currents from the AC system with very low harmonic content, typically less than 3% total harmonic distortion.The topology uses only passive components and has fewer component than other rectifier circuits with similar performance.An additional low power harmonic injection circuit enhances the performance of the circuit to obtain low harmonic current pollution levels being comparable with those achieved from other multi-pulse rectifier.Finally ,high power factor and low harmonic features of multi-pulse rectifier are verified by simulation and experiment.This rectifier is very suitable for direct-drive wind power system.