对一个区域内的变压器配置中性点电容隔直装置，可以作为一个优化问题来研 究． 文中设计了包含隔直装置的电网计算模型，并考虑电容器的特点，以装置台数少和中 性点电流的总和小为优化目标建立了组合配置的数学模型，结合粒子群优化算法，在不影 响隔直效果的同时尽可能减少装置投入成本，实现以最少的隔直装置台数达到最好的隔 直效果． 最后讨论了优化计算模型的求解方法，提出了一种改进的粒子群优化算法，并通 过算例验证了该算法的有效性．

To configure the capacitor-type blocking devices at the neutral point of a transformer can be taken as an optimization problem.In this paper,a computing model of the power grid with blocking devices is designed.Then,based on the characteristics of capacitors,a mathematic model for optimal configuration is constructed by taking small device number and small sum of neutral point currents as the objectives.In the mathematical model,the particle swarm optimization algorithm is combined to cut off as much device cost as possible without affecting the blocking efficiency,thus achieving the best blocking effect at the cost of the least blocking devices.Finally,the method to solve the computing model is discussed,and an improved optimization algorithm is proposed and then proved to be effective by an example.