抑制变压器直流偏磁电容隔直装置的优化配置研究

发布时间：2018-04-26 22:38

本文选题：直流偏磁 + 电容隔直装置　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：地磁暴及高压直流输电都会引起变压器出现直流偏磁,影响电网的安全稳定运行。在变压器中性点安装电容隔直装置是减轻变压器直流偏磁的常用方法。由于偏磁电流在电网中流通路径复杂,在某变压器中性点安装电容隔直装置,如不经充分考虑,往往会引起相邻变压器直流偏磁更加严重。本文优化了电容隔直装置的主要参数,考虑自耦变压器接线和电网拓扑结构,引入变压器有效偏磁电流作为变压器直流偏磁风险评估的依据,分析隔直装置的安装对变压器有效偏磁电流的影响,提出了优化配置方法：在保证所有变压器的有效偏磁电流小于允许限值为条件下,以隔直装置的安装数量最少作为优化的目标,用基于改进轮盘赌选择法的遗传算法求解。以甘肃主电网和溪浙直流工程受端电网为例,分别构建了包含47座变电站、101个节点的GIC等效模型和包含73座变电站、157个节点的直流等效模型,根据约束条件与优化目标,计算了隔直装置安装的数量和位置,并与未优化的治理方案作了比较。结果表明,针对电容隔直装置优化配置问题,无论是抑制地磁暴引起的变压器直流偏磁还是抑制高压直流输电引起的变压器直流偏磁,本文优化配置方法均具有可行性和优越性。
[Abstract]:Geomagnetic storm and HVDC transmission will cause DC bias of transformer, which will affect the safe and stable operation of power grid. It is a common method to reduce DC bias of transformer by installing capacitor straightening device at the neutral point of transformer. Due to the complex flow path of the bias current in the power network, the installation of capacitive straightening device at the neutral point of a transformer will often cause the DC bias of adjacent transformers to become more serious if it is not fully considered. In this paper, the main parameters of the capacitive straightening device are optimized. Considering the connection of the autotransformer and the topology of the power network, the effective bias current of the transformer is introduced as the basis for the risk assessment of DC bias of the transformer. This paper analyzes the influence of the installation of the straightening device on the effective bias current of the transformer, and puts forward the optimal configuration method: under the condition that the effective bias current of all transformers is less than the allowable limit, Taking the minimum installation number of the straightening device as the target of optimization, the genetic algorithm based on the improved roulette selection method is used to solve the problem. Taking the main power network of Gansu province and the receiving end network of Jiangsu and Zhejiang DC project as examples, the GIC equivalent model with 47 substations and 101 nodes and the DC equivalent model with 73 substations and 157 nodes are constructed, respectively, according to the constraint conditions and the optimization objectives. The installation number and position of the isolator are calculated and compared with the unoptimized treatment scheme. The results show that the DC bias of transformer caused by geomagnetic storm and the DC bias of transformer caused by HVDC transmission are restrained for the optimal configuration of capacitive spacer. In this paper, the optimal configuration methods are feasible and superior.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM41

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