摘要
中点电位的平衡控制是中点钳位式三电平拓扑安全可靠运行的关键,但现有文献均未能通过建立精确的数学模型对中点电位漂移的物理机理进行精确分析,控制参数整定困难。该文建立了考虑未知干扰和参数摄动影响的中点钳位式三电平D-STATCOM的精确数学模型,利用重复控制与无源性控制相结合的方法实现了基于鲁棒L_2性能准则的电流控制器设计,精确分析了参数摄动导致的有功能量分配不均是中点电位漂移的根本原因。通过零序分量注入,利用直流侧上下端电容器之间的有功能量交换实现了中点电位的平衡控制。通过仿真以及1.14 k V,±400 k Var煤矿供电系统的工程应用,验证了该文所建立模型的准确性以及所提控制算法的可行性和有效性。
The neutral-point potential balancing control is very important for the NPC three-level inverter, but existing literatures can＇t accurately analysis the potential drift by physical model. This paper proposed an accurate mathematical model of the D-STATCOM based on NPC three-level inverter with unknown disturbances and parametric perturbation, and then a novel robust current control with L2-gain performance based on the combination with repetitive control and passivity-based control was realized. The analysis indicates that the basic reason for the neutral-point potential drift is the unbalanced distribution of active power caused by parametric perturbation. By injecting zero-sequence voltage, the neutral-point potential balancing control can be realized based on the active power exchange between the dc-link capacitors. The effectiveness and performance of this model and control strategy is verified by simulation and has been tested on a practical installation and operation of ±400 kVar, 1.14 kV equipment in coal mine power supply system.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第14期3868-3877,共10页
Proceedings of the CSEE
基金
国家自然科学基金项目(51407001)~~
关键词
鲁棒L2性能准则
中点电位控制
零序电压
有功能量交换
robust L2-gain design
neutral-point potential control
zero-sequence voltage
active power exchange
