DSTATCOM的滑模变结构控制研究

Research on Sliding Mode Variable Structure Control of DSTATCOM

基于对三相四线制配电网静止同步补偿器(DSTATCOM)非线性数学模型的时域分析,得出滑模变结构控制的一般规律。为进一步提高滑模变结构的控制品质,提出一种具有饱和特性的滑模变结构控制方法,对该方法下三相四线制DSTATCOM的控制性能进行了分析,该方法能使输出电流快速、准确地跟踪参考电流,具有鲁棒性强,动态响应快,能较好地抑制毛刺现象等优点。利用Matlab建立了仿真模型,并研制了一台基于DSP的容量为20 kVA的实验样机,仿真和实验结果证明了该控制方法用于DSTATCOM的正确性和可行性。

Based on the time-domain analysis of three-phase four-wire DSTATCOM nonlinear mathematical model, the common sliding mode variable structure control strategy is proposed.To improve the quality of the common sliding mode variable structure control, a new sliding control strategy with saturation characteristic is proposed.The control performance under the proposed control strategy is analyzed.The output currents can tracking the reference currents quickly and precisely.The proposed control method possesses the advantages such as strong robusticity,good dynamic response and low chattering.Simulation based on Matlab is built and a 20 kVA experimental prototype based on DSP is implemented.Simulation and experimental results show its validity and feasibility.