The article analyses original methods of DGA fault diagnose, include three-ratio method, artificial neural network method, Fuzzy Theory, diagnosing expert system, grey relational algorithm, et.

本文分析了原有的DGA故障诊断方法，包括三比值法、人工神经网络法、模糊理论、变压器诊断专家系统、灰色关联算法等。

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Aimed at the characteristics of electro-hydraulic proportional pressure control system, such as, non-linear, uncertainty dynamic, and so on, a grey prediction fuzzy control algorithm was proposed.

针对电液比例压力控制系统的特点，即非线性、动态不确定性等，提出了一种灰色预测模糊控制算法。

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Incorporating the grey prediction, fuzzy control and the conventional PID control, a design method of the grey prediction fuzzy PID control algorithm is presented.

将灰色预测、模糊控制与常规pid控制三者的设计思想融合起来，提出了一种灰色预测模糊pid控制算法。

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