摘要
控制技术是应用逆变器在配电网实现电能质量补偿的关键。提出一种基于参考电压矢量平移的新型三维空间矢量调制方法,用来控制三电平三桥臂中点引出式逆变器,实现三相四线系统中的并联电能质量补偿。与三相三线系统中的两维空间矢量调制不同,这种新型三维空间矢量调制方法基于α-β-0变换,利用零序分量补偿中线电流。所提出的控制方法用在三相四线系统中的并联电能质量补偿器中,Matlab下的仿真结果表明这一控制方法可以使并联补偿器同时完成抑制谐波、补偿无功和中线电流的综合功能。通过与三维α-β-0滞环控制方法补偿效果的比较,证明三维空间矢量控制方法可以在较低的开关频率下达到更好的补偿效果。
Control technique is needed to improve the compensation of power quality with converters.A3-Dimensional Space Vector PWM(3DSVM)control technique for3-Level3-Leg Center-Split Inverter is proposed.Different from the conventional2-Dimensional SVM control technique,it is based on theα-β-0transformation.The zero-sequence component is considered to compensate the neutral current.The proposed control technique is applied to a shunt power-quality compensator in three-phase four-wire system.The results of computer simulations with Matlab show that it can compensate the harmonics,reactive currents and imbalance simultaneously.The proposed control technique is also compared with3-Dimensional Sign Cubic Hysteresis control technique.The simula-tion results show that the3DSVM control has better performance in shunt power-quality comp ensation.
出处
《电力自动化设备》
EI
CSCD
北大核心
2003年第6期16-20,共5页
Electric Power Automation Equipment
