摘要
在双馈风力发电系统中,直流链电压的稳定对双馈感应风力发电机(DFIG)的稳定运行至关重要,特别是在电网电压不平衡情况下,尤为突出。而直流链电压的稳定主要取决于并联网侧变换器的控制策略。利用等效负载的概念,对带串联网侧变换器DFIG的新拓扑结构在不平衡电网电压条件下的能量流动、直流链电压波动情况进行了分析,建立了其能量流动等效数学模型。在此基础上推导出此新拓扑结构中并联网侧变换器控制指令算法,协调串联网侧变换器的控制,有效抑制了不平衡电网电压下2倍频分量和直流暂态分量对直流链电压的影响。最后,通过实验验证了所提出的控制算法和控制方案的正确性和有效性。
The ripple of the DC link voltage is of significance to the stable operation of doubly-fed induction generator （DFIG） ,especially under voltage unbalanced condition.And the stabilizing of the DC link voltage is mainly dependent on the control strategy of the parallel grid-side converter.Using the equivalent circuit, the energy flow and DC link volt- age fluctuating characteristics of the DFIG with series grid-side converter under voltage unbalanced condition are ana- lyzed.Furthermore,the corresponding equivalent model of energy flow is also set up.Based on that,the control strategy of the parallel grid-side converter is proposed, which coordinates the control of the series grid-side converter, thus effec- tively suppressing the influence of component at double fundamental frequency and DC transient component to the DC link voltage.At last, the effectiveness of the proposed control scheme is verified by the experimental results.
出处
《电力电子技术》
CSCD
北大核心
2012年第10期63-66,共4页
Power Electronics
基金
云南省教育厅科学研究基金项目(2012Y317)~~
