摘要
三相四桥臂静止无功发生器(SVG)在解决三相四线制低压供电系统中由三相不平衡、非线性负载所带来的电流不平衡及严重畸变,功率因数低等问题有明显的优越性。针对三相四桥臂SVG的非线性强耦合特点,提出一种基于虚拟磁链观测器的无源控制(PBC)算法。基于系统的无源性提出一种非线性控制策略,并采用abc坐标系下的3D-SVPWM进行调制,产生控制SVG主电路的开关信号,从理论上保证了闭环系统的渐进稳定。最后,通过仿真试验与传统PR、PI控制比较,验证该控制策略的有效性和优越性。
The three-phase four-bridge static var generator(SVG)has obvious advantages in solving the problems of unbalanced current,serious distortion and low power factor caused by three-phase unbalance and nonlinear loads in the threephase four-wire low-voltage power supply system.In view of the nonlinear strong coupling characteristics of three-phase four-bridge SVG,apassivity-based control(PBC)algorithm based on virtual flux observer is proposed.Based on the passivity of the system,a nonlinear control strategy is proposed,and 3D-SVPWM in the abc coordinate system is used for modulation to generate the switching signal to control the main circuit of the SVG,which theoretically guarantees the asymptotic stability of the closed-loop system.Finally,the ffectiveness and superiority of the control strategy are verified by comparing the simulation tests with traditional PR and PI control.
作者
樊阳文
徐文成
张豪
杨洋
FAN Yangwen;XV Wencheng;ZHANG Hao;YANG Yang(NR Electric Power Electronics Co.,Ltd.,Changzhou 213100,China)
出处
《电工技术》
2020年第7期12-16,19,共6页
Electric Engineering
