大风电场内部故障特性的研究

发布时间：2018-04-26 21:07

本文选题：双馈感应发电机 + 风力发电机组　；参考：《中国石油大学(华东)》2014年硕士论文

【摘要】：风电技术作为最具发展前景的新兴产业,是我国应对能源危机、环境问题、实现可持续发展的最佳选择。随着大规模的风电场并网,电网对风电场的运行要求也逐步提高。在实际运行中,风电场集电线路保护配置不合理,容易扩大事故范围,导致整个风电场的风电机组连锁脱网,严重威胁电力系统的安全稳定运行。因此,研究风电场内部的保护原理,尤其是集电线路的保护和配置原则,对现阶段我国风电技术的发展具有重要的意义。根据风电场的参数和实际运行情况,在PSCAD/EMTDC平台上搭建风电场的模型；仿真风速波动和各类外部故障时,风电机组的输出特性,定量分析风电机组输出的短路电流；根据目前风电场配置的继电保护,给出集电线路保护配置的整定值,并指出目前保护存在的问题；结合风电机组的低电压穿越特性,重新定义集电线路电流保护I段的整定原则,即短路电流应躲过本集电线路全部机组刚好脱网的最小短路电流,并增加方向元件以防止非故障线路的误动作；建议未来风电场保护应考虑风电机组的电源特性,利用光纤电流差动保护实现集电线路全线速动；通过仿真比较目前集电线路电流保护、改进电流保护和光纤电流差动保护三种方案,验证了改进方案和电流差动方案可以有效的提高保护的快速性和选择性,降低了大规模风电机组发生连锁脱网事故的可能性。
[Abstract]:Wind power technology, as the most promising emerging industry, is the best choice for our country to deal with the energy crisis, environmental problems and realize sustainable development. With the large-scale wind farms connected to the grid, the grid operation requirements for wind farms are gradually raised. In the actual operation, the protection configuration of the wind farm collecting line is unreasonable, and it is easy to expand the scope of the accident, which causes the wind turbine of the whole wind farm to be unconnected, which seriously threatens the safe and stable operation of the power system. Therefore, it is of great significance for the development of wind power technology in our country to study the protection principle of wind farm, especially the protection and configuration principle of collecting line. According to the parameters and actual operation of wind farm, the model of wind farm is built on PSCAD/EMTDC platform, the output characteristics of wind turbine are simulated when wind speed fluctuates and various external faults, and the short-circuit current output of wind turbine is quantitatively analyzed. According to the relay protection of wind farm at present, the setting value of collector line protection is given, and the existing problems of current protection are pointed out, and the low voltage traversing characteristic of wind turbine is combined. The setting principle of current protection section I of collector line is redefined, that is, the short circuit current should avoid the minimum short circuit current that all the units of this collection line are just off the grid, and the directional element should be added to prevent the maloperation of the non-fault line. It is suggested that the future wind farm protection should take into account the power characteristics of wind turbine units, and use fiber optic current differential protection to realize the full line quick operation of the collector line, and compare the current protection of the current collector line with that of the current collector line through simulation. Three schemes of improved current protection and fiber current differential protection are proved to be effective in improving the rapidity and selectivity of the protection and reducing the possibility of cascading decoupling accidents in large-scale wind turbines.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

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