Because power systems are complex and multi-variable, it is very difficult to realize automatic secondary load-frequency control.
电力系统一般都很复杂且变量又多，实现二阶负载—频率自动控制也相应变得很困难。
2
Automatic steering control is a complex nonlinear system, which includes lane keeping and lane changing.
自主侧向控制实现汽车自动调节转向和车道变换，是复杂的非线性控制系统。
3
Two-Stand Hot Reversing Mill is very complex as a auto control object, and rolling process is automatic procedure, the architecture of control system base on hierarchical control structure.