On the basis of power differential method, a novel principle of transformer protection using generalized instantaneous power is presented.

在差有功法的基础上，提出一种利用广义瞬时功率实现变压器保护的新原理。

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Then this paper simplified the differential eguation contraposing the cooling tower which is a special structure, and adopted the power series method to solve the differential eguation.

随后针对冷却塔这个特殊结构，把微分方程进行了简化，并且采用幂级数解法解答出自振微分方程。

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By combining the continuous power flow method with improved differential evolution calculation, the static voltage stability margin is found via optimal grouping of relevant variables.

在连续潮流法的基础上，结合经过改进的差异进化算法，通过对变量的组合优化，求取系统静态电压稳定安全裕度。

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