中文摘要：

分析了数字化变电站系统的最优可靠性分配问题，提出了一套面向工程应用的系统优化方案。以花费最小分配法为基础，引入可行性一成本模型建立非线性规划，并使用广义既约梯度法求解。得到最优可行解后，对等效冗余系数最高的元件增加冗余，实现对系统可靠度贡献最大、成本最省的冗余配置策略。为验证上述方法的有效性，对典型110kV数字化变电站主变间隔的保护系统进行了可靠性分配计算，并设计了工程上易于实现的冗余配置方案。

英文摘要：

This paper analyzes the optimal reliability allocation issue of digital substation systems, and proposes an optimization allocation method for engineering applications. Based on the minimum cost allocation method, the paper introduces a feasibility-cost model to establish non-linear planning~ and uses the generalized reduced gradient method to find the optimal feasible solution. After that, the equivalent redundancy coefficient is used to measure the importance of the components. By realizing redundancy in the most important component, the reliability of the whole system would be increased in a most effective way. Taking a transformer bay in a typical 110 kV substation as an example, the reliability allocation calculation and the redundancy scheme are given to demonstrate the effectiveness of the proposed method.