多直流送出交流系统继电保护动作特性分析

发布时间：2018-07-12 11:57

本文选题：继电保护 + 直流输电　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：直流输电系统表现出与交流系统迥异的电气特征,并且直流系统的运行工况会对传统交流系统的运行造成一定的影响,进而对继电保护等二次设备的动作行为产生影响,严重情况下会导致继电保护装置的误动作。针对上述特点,迫切需要研究直流保护控制系统在大规模新能源接入及交直流、多直流背景下的适应性,深入研究与电网发展相适应的故障识别判据,改进现有交直流继电保护的性能,为电网运行提供保障。针对上述研究内容,本文通过收集宁夏电网网架结构、交流线路参数、常规电源参数、风电和光伏电源参数、直流输电系统一次参数和控制逻辑等原始数据和参数,进行合理的等值简化,形成适用于继电保护研究的直流输电系统模型、交流电网模型、新能源并网模型等,形成统一的EMTDC仿真模型。收集常用继电保护元件的原理和实现方法,通过程序模拟实际继电保护装置的计算过程,形成与实际保护一致的保护元件模型。通过仿真计算和谐波分析,提出保护运行和改进的建议。通过建模、仿真,形成适用于继电保护研究的宁夏超/特高压交直流、多直流电网模型,针对工频变化量距离保护、电流纵联差动保护和距离保护进行分析,掌握多直流交流系统对继电保护的影响。
[Abstract]:The DC transmission system has different electrical characteristics from AC system, and the operation condition of DC system will have a certain impact on the operation of traditional AC system, and then the action behavior of secondary equipment such as relay protection will be affected. In serious cases, maloperation of the relay protection device will be caused. In view of the above characteristics, it is urgent to study the adaptability of DC protection control system under the large-scale new energy access, AC / DC, multi-DC background and the fault identification criterion suitable for the development of the power network. To improve the performance of the existing AC / DC relay protection and to provide protection for the operation of the power grid. In view of the above research contents, this paper collects the original data and parameters such as the grid structure, AC line parameters, conventional power supply parameters, wind power and photovoltaic power supply parameters, primary parameters and control logic of HVDC transmission system, etc. A uniform EMTDC simulation model is formed by making reasonable equivalent simplification and forming DC transmission system model, AC power network model, new energy grid model and so on, which are suitable for the research of relay protection. The principle and realization method of common relay protection elements are collected. The calculation process of actual relay protection device is simulated by program, and a protective element model consistent with actual protection is formed. Through simulation and harmonic analysis, some suggestions for protection operation and improvement are put forward. Through modeling and simulation, the model of Ningxia UHV / UHV AC / DC, multi-DC network is formed, and the distance protection of power frequency variation quantity, current longitudinal differential protection and distance protection are analyzed. Master the influence of multi-DC AC system on relay protection.
【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】：2017
【分类号】：TM77

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