基于超螺旋-全阶快速终端复合滑模的柔性多状态开关控制策略

Soft open point control strategy based on super-twisting-full-order fastterminal composite sliding mode

随着大量分布式电源广泛接入配电网,针对其电压波动及负载功率变化,为了提高系统鲁棒性且获得了更优的抖振抑制效果,提出了超螺旋滑模控制(super twisting sliding mode control, STSMC)与全阶快速终端滑模控制(full-order fast terminal sliding mode control, FOFTSMC)的复合控制。该控制策略同时解决了传统PI控制策略环节复杂、参数整定难度大等问题,提高了系统的动态性能,并且采用载波移相脉宽调制技术生成信号对MMC进行调制。最后通过Lyapunov雅普诺夫定理证明了系统的稳定性。搭建了配电网中的背靠背柔性多状态开关(soft open point, SOP)仿真模型进行分析,验证了所提控制策略具有较高的鲁棒性及动态性能。

With a large number of distributed power sources widely connected to the distribution network, in order to improve the robustness of the system and obtain better chattering suppression effect, a composite control of super twisting sliding mode control ( STSMC ) and full-order fast terminal sliding mode control ( FOFTSMC ) is proposed for voltage fluctuation and load power change. The control also solves the problems of complex link and difficult parameter setting of traditional PI control strategy, and improves the dynamic performance of the system. And the carrier phase shift pulse width modulation technique is used to generate signals to modulate MMC. Finally, the stability of the system is proved by Lyapunov theorem. The back-to-back SOP simulation model in the distribution network is built for analysis, which verifies that the proposed control strategy has high robustness and dynamic performance.