VSC-HVDC输电系统的模糊自抗扰控制

The fuzzy active disturbance rejection controller of VSC-HVDC system

电压源型换流器高压直流输电系统是一类非线性、多变量和强耦合的系统。考虑系统中存在的不确定性以及扰动等问题,首先建立电压源型换流器高压直流输电系统的数学暂态模型,并在此基础上设计双闭环结构的控制器。在内环控制中设计模糊自抗扰控制器,实现对直轴和交轴电流的解耦。设计扩张状态观测器环节估计系统不确定性及扰动并进行补偿,使得系统的鲁棒性和抗干扰性能力得到提高,同时设计模糊规则对扩张状态观测器参数进行整定。外环控制中采用PI控制器,能够实现有功功率和无功功率的独立调节功能。仿真结果验证了所提方法的有效性和优越性。

The voltage source converter high voltage direct current(VSC-HVDC)system is a nonlinear multivariable strong-coupled control system.First of all,a transient mathematical model of the VSC-HVDC system is developed with considering model uncertainties and disturbances,and based on the system model,controllers are designed with dual closed-loop structure.In the inner loop,fuzzy active disturbance rejection controller is developed to decouple the direct-axis and quadrature-axis currents.The uncertainties and disturbances can be estimated and compensated by employing extended state observers to improve the robustness and anti-interference ability of the system,and the parameters of the extended state observers are adjusted by designing fuzzy rules.In the outer loop,PI controller is designed to realize the independent regulation function of active power and reactive power.Simulation results show the effectiveness and superior performance of the proposed method.