Z-源稀疏矩阵变换器励磁的双馈风力发电系统

Research on Vector Control of Doubly-Fed Wind Power Generator Excited Using Z-Source Sparse Matrix Converter

针对矩阵变换器电压传输比低和其励磁的双馈风力发电系统(DFIG)易受非正常输入波动影响的不足,提出了一种适用于DFIG励磁的Z-源稀疏矩阵变换器系统。利用Z-源的升压特性来提高电压传输比,检测电容电压实现对直通因子的自动调节,从而实现对网侧波动的自动抑制。建立了系统数学模型,推导了DFIG系统定子磁场定向矢量控制策略表达式,搭建试验样机对所提方案进行试验验证,在亚同步、同步、超同步三种发电状态下的波形和并网试验结果验证了方案的可行和有效性。

According to the low voltage transfer ratio of matrix converter （MC） and immune to the influence of abnormal input voltage for double feed inductor generator （DFIG） excited by MC, A Z-source sparse matrix converter suited for being used as excitation power supply for DFIG was presented, the voltage transfer ratio had been improved using the Z-source boost feature and the influence caused by abnormal input voltage had been avoided using closed loop control. The expression of the variable speed constant frequency wind power generation system of stator flux oriented vector control was deduced based on the analysis of the double-fed wind generators working principle and mathematical model. A experimental prototype had been built, the experimental results working under sub- synchronous, synchronization and super-synchronous verified the feasibility and effectiveness of the proposed strategy.