VSC-HVDC双积分滑模解耦控制器设计

针对传统的双闭环矢量电流控制(VCC)动态响应与解耦性能不佳、电流谐波畸变率高等不足,首先建立了VSC-HVDC系统在同步旋转坐标系中的暂态数学模型.然后结合直接功率控制(DPC)和积分滑模控制(ISMC)的特点,提出了双积分滑模直接功率控制(DISM-DPC)策略,设计以瞬时功率偏差为系统状态的双积分滑模面并推导了相应的解耦控制律.最后在PSCAD/EMTDC中建立系统的仿真模型.结果表明:此方法不仅实现了功率解耦,而且算法高效简捷,提高了系统的动静态品质和鲁棒性,并有效抑制了滑模控制因开关切换动作而产生的抖振现象.

Design of Double Integral Sliding Mode Decoupling Controller for VSC-HVDC System

In view of the disadvantages of traditional double closed-loop vector current control (VCC), such as slow dynamic response, pool decoupling performance and high current harmonic distortion, a transient mathematical model for the VSC-HVDC system in d-q synchronous reference frame was developed. Then, a double integral sliding mode direct power control strategy (DISM-DPC) combining the features of direct power control (DPC) and integral sliding mode control (ISMC) was proposed. Double integral sliding mode decoupling based on the deviations of instantaneous active and reactive power were designed, and the corresponding control laws were derived. Finally, the simulation model of the system was established by PSCAD/EMTDC, and the results show that the method can achieve power decoupling, improve the dynamic and static quality and robustness of the system with simple algorithm, and effectively reduce chattering caused by switching action.