摘要
针对风电系统中由于故障或不平衡负载等不确定性扰动引起的电网电压波动问题,在分析网侧逆变器数学模型的基础上,设计一种扰动观测器对其进行自适应补偿,抑制扰动给系统带来的不利影响。根据矢量控制原理,设计一种非奇异终端滑模控制器,使网侧逆变器输出的交直轴电流在有限时间内达到给定值,并采用高阶终端滑模消除抖振。仿真结果表明,采用扰动观测器与高阶终端滑模控制相结合的方案,增强了系统抵御不确定干扰的鲁棒性并提高了跟踪精确度,系统具有良好的动态性能。
Aiming at the voltage fluctuations caused by the fault, the unbalanced loads and other uncer-tainty factors in the wind power system, the mathematical model of grid-connected inverter was analyzed, a kind of disturbance observer was designed to compensate them adaptively, and the adverse effect to power system was suppressed. Based on the theory of vector control, a nonsingular terminal sliding mode controller was designed, which made the quadrature direct axis current of grid-connected follow the given value in finite time. A kind of high-order terminal sliding modes was utilized to eliminate the chattering. The simulation results show that the method combining the disturbance observer with the high-order termi-nal sliding mode control has strong robustness against the outside disturbance, the tracking precision is improved, and good dynamic performance is got.
出处
《电机与控制学报》
EI
CSCD
北大核心
2014年第2期96-101,共6页
Electric Machines and Control
基金
河北省自然科学基金(F2012203088)
关键词
网侧逆变器
高阶滑模
扰动观测器
鲁棒性
有限时间
grid-connected inverter
high-order terminal sliding mode
disturbance observer
robust-ness
finite time
