交直流互联系统非线性自适应控制规律设计

针对舍有多台发电机的交直流互联系统,为了提高交直流输电系统的稳定性,应用非线性自适应控制设计方法,通过递推法得到了应用于交直流互联系统直流功率调制的非线性自适应控制策略,该控制规律包含了对系统中未知参数的动态估计,用以阻尼交直流互联系统的区域间功率振荡。最后,获得了交直流互联系统的非线性自适应直流附加控制器的一般表达式。4机系统的仿真结果表明,与传统的线性直流功率调制相比较,所设计的控制器对联络线的功率振荡具有良好的阻尼功能;特别是当系统中出现大的扰动时,更能体现该控制器的良好性能。

Nonlinear adaptive control law for AC/DC interconnected power system

To enhance the stability of interconnected AC/DC transmission system with multiple machines,a nonlinear adaptive control law is designed for its HVDC power modulation by recursive method.It involves a dynamic estimator of unknown system parameters to damp inter-area oscillation. A general expression of nonlinear adaptive HVDC auxiliary controller is obtained.Simulation on a four-machine system shows that,compared with traditional linear HVDC power modulation,the designed controller is better in damping tie line power oscillation,especially during large system disturbance.