摘要
为了使静止无功发生器(static synchronous compensator,STATCOM)在不对称故障期间也能快速、有效、安全地发挥其最大的作用,提出了一种正、负序网络解耦空间矢量控制策略(space vector pulse width modulation,SVPWM),该控制策略一方面可以在不对称故障期间对负序电流进行补偿,另一方面解耦可以精确快速补偿无功负荷;同时空间矢量脉宽调制的应用也提高了直流侧电压的利用率。仿真结果表明:提出的控制策略不仅减少了STATCOM直流侧电压的波动,避免了装置在不对称故障期间的退网,而且对负序电流进行了补偿,消除了能量传输中的波动量,使STATCOM在不对称故障期间无功补偿能力进一步加强,维持了风电系统并网处电压的稳定性。
In order to enable the static synchronous compensator(STATCOM)to perform its maximum function quickly,effectively and safely during an asymmetrical fault,a positive and negative sequence network decoupling space vector(SVPWM)control strategy is proposed in this paper.On the one hand,the control strategy can compensate the negative sequence current during the asymmetrical fault.On the other hand,the decoupling can accurately compensate the reactive load.Meanwhile,the application of space vector pulse width modulation(SVPWM)also improves the utilization factor of DC side voltage.The simulation results indicate that the proposed control strategy not only reduces the fluctuation of the DC side voltage of the STATCOM,prevents the device from withdrawing from the network during the asymmetrical fault,but also compensates the negative sequence current and eliminates the fluctuation quantities in the energy transmission,strengthening STATCOM reactive compensation ability during the asymmetric fault,maintaining the stability of the voltage at the place of grid connection of the wind power system.
作者
张鹏
霍利民
ZHANG Peng;HUO Limin(School of Mechanical and Electrical Engineering, Agricultural University of Hebei, Baoding, Hebei 071000, China)
出处
《中国科技论文》
北大核心
2017年第23期2727-2732,共6页
China Sciencepaper
