模块化多电平换流器的参数自适应非线性控制方法

Parametric Adaptive Nonlinear Control Method for Modular Multilevel Converters

模块化多电平换流器已广泛应用于直流输电、电能治理等领域,但常遭受未知扰动和参数变化的影响。考虑MMC自身的强耦合非线性特点,提出一种适用于MMC的参数自适应非线性控制方法。首先引入参数自适应环节来建立MMC数学模型;然后借助反步逆推的思路,利用构建的Lyapunov方程推导满足系统稳定性要求的控制变量;最后搭建基于半实物平台的试验模型,结果进一步验证了所提控制策略的正确性和优越性。

Modular Multilevel Converter(MMC)is widely used in high-voltage DC distribution,power quality regulation,etc.However,it is always influenced by the unknown disturbance and parameter variations.Considering its strong coupling and nonlinear features,a novel parametric adaptive nonlinear control scheme for MMC is proposed in this paper.First of all,the parametric adaptive parameter is introduced to establish the mathematical model of MMC.Then,the control variables satisfying the stability requirements of the MMC system are derived by constructing the Lyapunov function with the idea of backstepping methodology.Finally,the experimental model based on the hardware-in-the-loop platform is built,and the results further verify the correctness and superiority of the proposed nonlinear control strategy.