基于模块化多电平换流器拓扑的静止同步补偿器非线性控制策略

基于模块化多电平换流器的静止同步补偿器(MMC-STATCOM)能够对输电系统进行灵活控制和动态补偿,对于充分挖掘现有电网潜力具有举足轻重的意义。但是,MMC-STATCOM作为一种强耦合、多变量的非线性系统,需要选择合适的非线性控制策略来实现其丰富的控制功能。建立MMC-STATCOM数学模型并结合非线性控制理论中的优点,提出了无源滑模控制策略。当系统参数变化或存在外部扰动时,该控制策略赋予MMC-STATCOM系统较强的鲁棒性和良好的控制性能。在MATLAB/Simulink中构建了21电平MMC-STATCOM仿真系统,仿真结果验证了所提控制策略的可行性。

Nonlinear Control Strategy of STATCOM Based on MMC

Modular multi-level converter based static synchronous compensator (MMC-STATCOM) can flexibly control and dynamically compensate the transmission system, which is of great significance to fully tapping the potential of the existing power grid. However, as a strongly coupled, multi-variable nonlinear system, MMC-STATCOM needs to choose appropriate nonlinear control strategies to realize its rich control functions. The mathematical model of MMC-STATCOM is established and the advantages of nonlinear control theory are combined to propose a passive sliding mode control strategy. When the system parameters change or exist external disturbance, the control strategy gives MMC-STATCOM system strong robustness and good control performance. A 21-level MMC-STATCOM simulation system was constructed in MATLAB / Simulink, and the simulation results verified the feasibility of the proposed control strategy.