基于自适应Terminal滑模控制方法的VSG控制  

VSG control based on adaptive Terminal sliding-mode control method

作　　者：严彬彬 王宝华[1] YAN Binbin;WANG Baohua(School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学自动化学院,江苏南京210094

出　　处：《电力自动化设备》2018年第10期140-146,共7页Electric Power Automation Equipment

摘　　要：由于分布式电源并网逆变器存在的低惯性、欠阻尼特性会影响电力系统稳定性,利用考虑发电机励磁与汽门综合控制的同步发电机四阶模型,设计了基于自适应Terminal滑模控制方法的虚拟同步发电机控制方案。针对系统的2个输入变量,构造了2个非奇异的Terminal滑模函数,由于Terminal滑模函数为非线性函数,使得误差可以快速收敛,从而保证了控制器良好的控制效果。仿真结果验证了所提控制策略可以为系统提供必要的惯性和阻尼,保证系统在参数不确定和存在外界扰动情况下的鲁棒性,能够抑制振荡并提高电力系统的稳定性。The low inertia and under-damping characteristics of the inverter-dominated distributed generation unit may impact the power system stability. Using the fourth-order synchronous generator model with the excitation and valve comprehensive control, a virtual synchronous generator control scheme based on adaptive Terminal sliding- mode control is designed. Two nonsingular Terminal sliding-mode functions are constructed based on the two input variables of the system. The convergence of the error is fast owing to the nonlinear Terminal sliding-mode function. As a consequence,the control effectiveness of the designed controller can be ensured. The simulative results show that the proposed control strategy can provide sufficient inertia and damping to guarantee the robustness of system in the presence of uncertain parameters and external disturbances ,which can further suppress the system oscillation and improve the power system stability.

关 键 词：虚拟同步发电机 并网逆变器 TERMINAL滑模控制 稳定性 鲁棒性 

分 类 号：TM761[电气工程—电力系统及自动化]