所提出的模糊递推积分PI控制算法还可以对周期性的被控量实现无静差控制，如交流电机的闭环控制。
The proposed recursive integral PI algorithm can also be applied to the control of periodic reference current with zero steady-state error, such as sin AC drive control.
在一元数值积分公式的基础上，提出了二重数值积分的复合公式，并给出复化复合公式和逐次减半的复合递推公式，通过实验比较了两种算法。
The article gives the reversible condition of a kind of jump Vandermonde matrix through linear equations, and recursion formula and the expression of its inverse Matrix.
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