摘要
提出了一种三维空间矢量算法原理,并将其用于三相四线系统配电网静止无功发生器(DSTATCOM)中。选取直流侧中点引出式两电平三桥臂逆变器作为DSTATCOM的主电路,在a-b-c坐标下建立了三桥臂逆变器数学模型。分析了三维空间中电压矢量的分布,给出了三维空间矢量脉宽调制的实现方法和参考电压矢量的控制策略,并使用PSCAD/EMTDC对三相四线系统DSTATCOM在感性负载、非线性负载及负载突变等情况下进行了仿真,仿真结果表明,这一控制算法可以使DSTATCOM具有良好的无功补偿能力、抑制不平衡和谐波的特性。
In this paper, a three-dimensional space vector modulation （3DSVM） algorithm principle is presented and the principle is applied to DSTATCOM in three-phase four-wire system. A two-level threeleg inverter is selected for DSTATCOM. The mathematical model in a-b-c is built. The space vectors＇ allocation in three-dimension system is analyzed, and the realization of 3 DSVPWM and the control tactics of reference voltage vectors are suggested. The simulation model of the inverter is built up. The DSTATCOM simulation for inductance loads, nonlinear load and load saltation in three-phase four-wire system is performed by PSCAD/EMTDC. The simulation results indicate that this control algorithm can render DSTAT- COM to have the better idle-work compensation capacity and unbalance and harmonior wave inhibiting behaviors.
出处
《西安理工大学学报》
CAS
2008年第4期441-445,共5页
Journal of Xi'an University of Technology
